阅读说明：本技术 通信系统、终端、控制方法及程序 (Communication system, terminal, control method, and program ) 是由 村上丰 桥田伸彦 于 2018-07-12 设计创作，主要内容包括：通信系统(3970)具备：多个相机(3971A等),通过拍摄生成图像数据；服务器(3972),保存多个相机(3971A等)分别生成的图像数据；以及多个发送装置(3973A等),与多个相机(3971A等)一对一地对应,多个发送装置分别发送作为可视光通信信号而包含以下信息的光,该信息是与用于向保存有该发送装置所对应的相机生成的图像数据的服务器内的保存场所进行访问的通信有关的信息。(A communication system (3970) is provided with: a plurality of cameras (3971A and the like) that generate image data by shooting; a server (3972) that stores image data generated by each of the plurality of cameras (3971A, etc.); and a plurality of transmission devices (3973A, etc.) that correspond to the plurality of cameras (3971A, etc.) one-to-one, and each of the plurality of transmission devices transmits light that includes, as a visible light communication signal, information relating to communication for accessing a storage location in a server that stores image data generated by the camera corresponding to the transmission device.)

1. A communication system is provided with:

a plurality of cameras that generate image data by shooting;

a server for storing the image data generated by each of the plurality of cameras; and

and a plurality of transmission devices corresponding to the plurality of cameras one-to-one, wherein each of the plurality of transmission devices transmits light including, as a visible light communication signal, information relating to communication for accessing a storage location in the server in which the image data generated by the camera corresponding to the transmission device is stored.

2. The communication system of claim 1,

the information includes address information indicating the storage location where the image data is stored.

3. The communication system of claim 1 or 2,

the information includes an encryption key used for encryption of communication in which the terminal accesses the storage location in which the image data is stored.

4. The communication system according to any one of claims 1 to 3,

the information includes an identifier of a base station used for wireless communication in which a terminal accesses the storage location where the image data is stored.

5. The communication system according to any one of claims 1 to 4,

the information includes position information indicating a position of a place where the image data is captured.

6. A terminal is provided with:

a receiving device that receives light including information indicating a storage location of image data as a visible light communication signal; and

and a transmitting/receiving device for receiving the image data from the storage location indicated by the information received by the receiving device.

7. A control method of a communication system, wherein,

the communication system includes a plurality of cameras, a server, and a plurality of transmission devices corresponding to the plurality of cameras one-to-one;

generating image data by shooting with the plurality of cameras;

storing the image data generated by each of the plurality of cameras in the server;

the plurality of transmission devices each transmit light including, as a visible light communication signal, information relating to communication for accessing a storage location in the server storing the image data generated by the camera corresponding to the transmission device.

8. A control method of a terminal, wherein,

receiving light including information indicating a storage location of image data as a visible light communication signal;

and receiving the image data from the storage location indicated by the received information.

9. A program for causing a computer to execute the control method of claim 8.

Technical Field

The invention relates to a communication system, a terminal, a control method and a program.

Background

As a method for acquiring location information by a device, there is a method using a GPS (Global Positioning system), in which the device estimates a location by receiving a modulated signal transmitted from a satellite and performing Positioning calculation.

However, when the device is indoors where it is difficult to receive radio waves transmitted from GPS satellites, there is a problem in that it is difficult to estimate the location.

As a method for solving this problem, for example, as shown in non-patent document 1, a device estimates a location using a radio wave transmitted from an access point of a wireless LAN (local area Network).

Disclosure of Invention

Problems to be solved by the invention

However, since it is not easy to know the SSID (service set identifier) of the access point that can be securely accessed, when the device is to obtain location information, there is a possibility that the device is connected to an access point of an unsecured SSID, and there is a threat of information leakage or the like.

Thus, further improvement is desired in the method of acquiring location information.

Means for solving the problems

A communication system according to an aspect of the present invention includes: a plurality of cameras that generate image data by image capturing; a server for storing the image data generated by each of the plurality of cameras; and a plurality of transmission devices that correspond one-to-one to the plurality of cameras, each of the plurality of transmission devices transmitting light that includes, as a visible light communication signal, information relating to communication for accessing a storage location in the server that stores the image data generated by the camera corresponding to the transmission device.

These inclusive or specific technical means may be realized by a system, a method, an integrated circuit, a computer program, a computer-readable recording medium such as a CD-ROM, or any combination of the system, the method, the integrated circuit, the computer program, and the recording medium.

Effects of the invention

According to the present invention, it is possible to improve the method of acquiring location information.

Drawings

Fig. 1 is a diagram showing an example of the configuration of a device and a terminal.

Fig. 2 is a diagram showing an example of a frame configuration transmitted by a modulated signal transmitted from a device.

Fig. 3 is a diagram showing an example of a configuration in a case where a plurality of devices are present.

Fig. 4 is a diagram showing an example of the configuration of a device, a terminal, and a base station that communicates with the terminal.

Fig. 5 is a diagram showing a specific display example of the display unit.

Fig. 6 is a diagram showing an example of a frame configuration of a modulated signal transmitted by a device.

Fig. 7 is a diagram showing an example of a frame configuration of a modulated signal transmitted by a base station.

Fig. 8 is a flowchart showing an example of processing performed by the device, the terminal, and the base station.

Fig. 9 is a diagram showing a specific display example of the display unit.

Fig. 10 is a diagram showing an example of a configuration of a communication system.

Fig. 11 is a diagram showing an example of a frame configuration of a modulated signal transmitted by a device.

Fig. 12 is a diagram showing an example of a frame configuration of a modulated signal transmitted by a wireless device.

Fig. 13 is a flowchart showing an example of processing performed by the device, the terminal, and the base station.

Fig. 14 is a diagram showing an example of the configuration of a device, a terminal, and a base station that communicates with the terminal.

Fig. 15 is a diagram showing an example of a frame configuration of a modulated signal transmitted by a device.

Fig. 16 shows an example of a frame configuration of a modulated signal transmitted from a device.

Fig. 17 is a flowchart showing an example 1 of a process performed by a device, a terminal, and a base station.

Fig. 18 is a flowchart showing an example 2 of a process performed by the device, the terminal, and the base station.

Fig. 19 is a diagram showing an example of a space.

Fig. 20 is a diagram showing an example of a configuration of a communication system.

Fig. 21 is a flowchart showing an example of processing performed by a wireless device of a terminal, a base station, and a part related to visible light or the like.

Fig. 22 is a diagram showing an example of a configuration of a communication system.

Fig. 23 is a diagram showing an example of a frame structure of a modulated signal transmitted by a device.

Fig. 24 is a diagram showing an example of a frame structure of a modulated signal transmitted by a device.

Fig. 25 is a diagram showing an example of a frame structure of a modulated signal transmitted by a device.

Fig. 26 is a diagram showing an example of a transmission method when a device transmits a plurality of frames.

Fig. 27 is a diagram showing an example of the area.

Fig. 28 is a flowchart showing an example of processing performed by the device, the terminal, and the base station.

Fig. 29 is a diagram showing an example of the configuration of an apparatus related to transmission of an optical modulation signal.

Fig. 30 is a diagram showing an example of the configuration of an apparatus related to transmission of an optical modulation signal.

Fig. 31 is a diagram showing a configuration example of a transmitting device and a receiving device.

Fig. 32 is a diagram showing a configuration example of a transmitting device and a receiving device.

Fig. 33 is a diagram showing an example of the configuration of an apparatus related to transmission of an optical modulation signal.

Fig. 34 is a diagram showing an example of the configuration of a device related to an optical modulation signal.

Fig. 35 is a diagram showing an example of the configuration of a transmitting device related to an optical modulation signal.

Fig. 36A is a diagram showing an example of the configuration of a transmitting device related to an optical modulation signal.

Fig. 36B is a diagram showing an example of the structure of the vehicle.

Fig. 36C is a diagram showing an example of the structure of the vehicle.

Fig. 36D is a diagram showing an example of a communication method between the transmission device and the reception device.

Fig. 36E is a diagram showing an example of the visible light communication method.

Fig. 36F is a diagram showing an example of the light emission pattern of the light source and the captured image.

Fig. 36G is a diagram showing an example of the light emission pattern of the light source and the captured image.

Fig. 36H is a diagram showing an example of a modulation scheme.

Fig. 36I is a diagram showing an example of a modulation scheme.

Fig. 37 shows a system including communication devices.

Fig. 38 is a flowchart showing an example of processing performed by the terminal, the base station, and the server.

Fig. 39A is a diagram showing a first example of a system related to a moving image providing method using an optical modulation signal.

Fig. 39B is a flowchart showing an example of processing related to a moving image providing method using an optical modulation signal.

Fig. 39C is a diagram showing a second example of a system related to a moving image providing method using an optical modulation signal.

Fig. 40 is a diagram showing an example of a scene of a stadium.

Fig. 41 is a diagram showing an example of the flow of operations of the camera, the transmission device, and the server.

Fig. 42 is a diagram showing an example of the operation flow of the terminal, the transmission device, and the communication device.

Fig. 43 is a diagram showing an example of a frame configuration of an optical modulation signal transmitted by a transmission device.

Fig. 44 is a diagram showing an example of a frame configuration of an optical modulation signal transmitted by a transmission device.

Fig. 45 is a diagram showing an example of a frame configuration of an optical modulation signal transmitted by a transmission device.

Fig. 46 is a diagram showing an example of a frame configuration of an optical modulation signal transmitted by a transmission device.

Fig. 47 is a diagram showing an example of a frame configuration of an optical modulation signal transmitted by a transmission device.

Fig. 48 is a diagram showing an example of a frame configuration of an optical modulation signal transmitted by the transmission device.

Fig. 49 is a diagram showing an example of a frame configuration of an optical modulation signal transmitted by a transmission device.

Fig. 50 is a diagram showing an example of a frame configuration of an optical modulation signal transmitted by a transmission device.

Detailed Description

A communication system according to an aspect of the present invention includes: a plurality of cameras that generate image data by image capturing; a server for storing the image data generated by each of the plurality of cameras; and a plurality of transmission devices that correspond one-to-one to the plurality of cameras, each of the plurality of transmission devices transmitting light that includes, as a visible light communication signal, information relating to communication for accessing a storage location in the server that stores the image data generated by the camera corresponding to the transmission device.

According to the above-described aspect, the communication system can provide the terminal with information relating to communication in the storage location for accessing the image data more securely. The terminal can acquire the location information more securely.

More specifically, the communication system transmits a (light) modulated signal containing information about a location from, for example, a visible light such as an led (light Emitting diode), an illumination, a light source, or a lamp provided indoors. The terminal (device) receives the (light) modulated signal by an image sensor such as a CMOS (complementary Metal Oxide semiconductor) or an organic thin Film CMOS (organic CMOS), for example, and performs processing such as demodulation to obtain at least information about the location, whereby an effect that the terminal can safely obtain the information about the location can be obtained.

For example, the information includes address information indicating the storage location where the image data is stored.

According to the above-described aspect, the communication system transmits the address information by visible light communication, thereby making it possible to acquire the location information more easily and more safely.

For example, the information includes an encryption key used for encryption of communication for a terminal to access the storage location in which the image data is stored.

According to the above-described aspect, the communication system can acquire the location information more easily and more securely by transmitting the encryption key through the visible light communication.

For example, the information includes an identifier of a base station used for wireless communication in which the terminal accesses the storage location in which the image data is stored.

According to the above-described aspect, the communication system transmits the identifier of the base station by visible light communication, thereby making it possible to more easily and safely acquire the location information.

For example, the information includes position information indicating a position of a place where the image data is captured.

According to the above aspect, the communication system transmits the position information of the imaging location by visible light communication, thereby making it possible to more easily and safely acquire the location information.

A terminal according to an aspect of the present invention includes: a receiving device that receives light including information indicating a storage location of image data as a visible light communication signal; and a transmitting/receiving device that receives the image data from the storage location indicated by the information received by the receiving device.

According to the technical scheme, the terminal can acquire the place information more safely.

A control method of a communication system according to an aspect of the present invention, the communication system including a plurality of cameras, a server, and a plurality of transmission devices corresponding one-to-one to the plurality of cameras; generating image data by imaging with the plurality of cameras; storing the image data generated by each of the plurality of cameras in the server; the plurality of transmission devices each transmit light including, as a visible light communication signal, information relating to communication for accessing a storage location in the server storing the image data generated by the camera corresponding to the transmission device.

This provides the same effect as the communication system described above.

A terminal control method according to an aspect of the present invention receives light including information indicating a storage location of image data as a visible light communication signal; and receiving the image data from the storage location indicated by the received information.

This provides the same effect as the terminal described above.

These inclusive or specific technical means may be realized by a system, a method, an integrated circuit, a computer program, or a computer-readable recording medium such as a CD-rom (compact Disc Read only memory), or may be realized by any combination of a system, a method, an integrated circuit, a computer program, and a recording medium.

Hereinafter, the embodiments will be specifically described with reference to the drawings.

The embodiments described below are all illustrative or specific examples. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, steps, order of the steps, and the like shown in the following embodiments are examples, and do not limit the present invention. Further, among the components of the following embodiments, components that are not recited in the independent claims indicating the uppermost concept will be described as arbitrary components.

(embodiment mode 1)

Fig. 1 shows an example of the configuration of a device 100 and a terminal 150 including a light source, illumination, light source, and lamp of visible light such as an led (light Emitting diode) according to the present embodiment. The device 100 includes a visible light such as an led (light emitting diode), an illumination, a light source, and a lamp. In addition, this apparatus is named "1 st apparatus".

The transmission unit 102 receives, for example, information on a location or information 101 on a position. The transmission unit 102 may also receive information 105 about time. The transmission unit 102 may also input information on a location, information on a position 101, and information on a time 105.

The transmission unit 102 receives information on a location, information 101 on a position, and/or information 105 on a time as inputs, generates a (optical) modulation signal based on these input signals, and outputs a modulation signal 103. And, for example, the modulated signal 103 is transmitted from the light source 104.

Here, an example of the information on the location or the information on the position 101 will be described.

(example 1) the information on the location or the information on the position 101 may be latitude and/or longitude information of the location/position. For example, information such as "45 degrees north latitude and 135 degrees east longitude" may be used as the information on the location or the information on the position 101.

(example 2) the information on the location or the information on the location 101 may be address information, and for example, information such as "tokyo kyo thousand generation area ○○ ting 1-1-1" may be used as the information on the location or the information on the location 101.

(example 3) the information on the place or the information on the position 101 may be information on a building, facilities, or the like. For example, information such as "tokyo tower" may be used as the information 101 on the location or the information on the position.

(example 4) the information on the location or the information on the position 101 may be information on a location or a position specific to an object installed in a building, facility, or the like.

For example, when there is a parking lot, it is assumed that a space where a car can be parked is a space equivalent to 5. At this time, the 1 st parking space is named as A-1, the 2 nd parking space is named as A-2, the 3 rd parking space is named as A-3, the 4 th parking space is named as A-4, and the 5 th parking space is named as A-5. Further, for example, information such as "a-3" may be used as information on a location or information 101 on a position.

Such an example is not limited to the case in a parking lot.

For example, information on "area/seat/store/facility and the like" in a stadium such as a concert facility, baseball/soccer/tennis, an airplane, an airport lounge, a railway, a station and the like may be used as the information on the place or the information on the position 101.

The method of configuring the information on the location or the information on the position 101 is not limited to the above example.

The terminal 150 receives the modulated signal transmitted by the 1 st device 100.

The light receiving unit 151 is an image sensor such as a CMOS or an organic CMOS. The light receiving unit 151 receives light including a modulation signal output from the 1 st device and outputs a reception signal 152. The receiving unit 153 receives the received signal 152 as an input, performs processing such as demodulation and error correction decoding on a modulated signal included in the received signal, and outputs received data 154.

The reception signal 152 output from the light receiving unit 151 may be a signal containing information of an image or a moving image obtained by an image sensor, or may be an output signal of another element that performs photoelectric conversion (from light to an electric signal). In the following description, when the device on the receiving side receives a modulation signal without particularly describing the processing performed by the light receiving unit 151, the device on the receiving side performs optical-electrical conversion (from light to an electrical signal) from light including the modulation signal by the light receiving unit 151, thereby acquiring "a signal of an image/moving image" and "a modulation signal for transmitting information". However, the above-described method is an example of a method for receiving a modulated signal by a receiving-side apparatus, and the method for receiving a modulated signal is not limited to these.

The data analysis unit 155 receives the received data 154 as input, estimates the location/position of the terminal 150, for example, from the received data 154, and outputs information 156 including at least location/position information of the terminal 150.

The display unit 157 receives the information 156 as an input, and displays the location/position of the terminal 150 on the display unit 157 based on the location/position information of the terminal 150 included in the information 156.

Fig. 2 shows an example of a frame structure transmitted by the modulated signal transmitted from the 1 st device 100. In fig. 2, the horizontal axis represents time. Assume that the 1 st device transmits, for example, a preamble (preamble)201, and then transmits a control information symbol (symbol)202, a symbol 203 regarding location information or position information, and a symbol 204 regarding time information.

At this time, it is assumed that the preamble 201 is a symbol used by the terminal 150 receiving the modulated signal transmitted by the 1 st device 100, for example, to perform signal detection, time synchronization, frame synchronization, and the like.

The control information symbol 202 is a symbol containing data such as a modulation signal configuration method, a method of an error correction coding scheme to be used, and a frame configuration method.

The symbol 203 relating to the location information or the position information is a symbol including the information relating to the location or the information relating to the position shown in fig. 1.

Further, symbols other than the symbols 201, 202, and 203 may be included in the frame. For example, as shown in fig. 2, a symbol 204 relating to time information may be included. It is assumed that the symbol 204 relating to the time information contains, for example, information of the time at which the 1 st device transmits the modulated signal. The frame structure of the modulated signal transmitted by the 1 st device is not limited to fig. 2, and the symbols included in the modulated signal are not limited to the structure of fig. 2 (symbols including other data and information may be included).

The effect when the first device 1 transmits a modulated signal and the terminal receives the modulated signal will be described as described in fig. 1 and 2.

Since the 1 st device transmits a modulated signal by visible light, a terminal capable of receiving the modulated signal is not located far away from the location where the 1 st device is present. Thus, the following effects can be obtained: by obtaining the location/position information transmitted from the 1 st device by the terminal, the terminal can obtain highly accurate position information easily (without performing complicated signal processing). Further, if the 1 st device is installed to a place where satellite waves from the GPS are difficult to receive, the following effect can also be obtained: the terminal can safely obtain high-precision position information by receiving the modulation signal transmitted by the 1 st device even in a place where radio waves from satellites of a GPS are difficult to receive.

(embodiment mode 2)

In this embodiment, an embodiment in a case where there is a plurality of the 1 st apparatuses described in embodiment 1 will be described.

In the present embodiment, for example, as shown in fig. 3, the 1 st-1 st device 301-1 having the same configuration as the 1 st device 100 in fig. 1 transmits a modulated signal and receives it by the terminal 302. The terminal 302 receives the modulated signal transmitted from the 1 st-1 st device 301-1, and obtains information on the location/position of the 1 st-1 st device and information on the time of the 1 st-1 st device, for example.

Similarly, the 1 st to 2 nd devices 301 to 2 having the same configuration as the 1 st device 100 of fig. 1 transmit modulated signals and the terminal 302 receives them. The terminal 302 receives the modulated signal transmitted from the 1 st-2 nd device 301-2, and obtains information about the location/position of the 1 st-2 nd device and information about the time of the 1 st-2 nd device, for example.

The terminal 302 can know the distance between the 1 st-1 st device 301-1 and the 1 st-2 nd device 301-2 in fig. 3 based on the 1 st-1 st information on location and position and the 1 st-2 st information on location and position. The terminal 302 can know the distance between the terminal 302 and the 1 st-1 st device 301-1 based on the information about the 1 st-1 st time and, for example, the time when the terminal receives the modulated signal transmitted by the 1 st-1 st device 301-1. Similarly, the terminal 302 can know the distance between the terminal 302 and the 1 st-2 nd device 301-2 based on the 1 st-2 nd information about the time and, for example, the time when the terminal 302 receives the modulated signal transmitted by the 1 st-2 nd device 301-2.

The terminal 302 knows the location of the 1 st-1 st device based on the 1 st-1 st information on the location/position. The terminal 302 knows the location of the 1 st-2 nd device based on the 1 st-2 nd information about the location/position. The terminal 302 knows "the triangle formed by the 1 st-1 device 301-1, the 1 st-2 device 301-2 and the terminal 302" according to the distance between the 1 st-1 device 301-1 and the 1 st-2 device 301-2 "," the distance between the 1 st-1 device 301-1 and the terminal "and the distance between the 1 st-2 device 301-2 and the terminal".

Therefore, the terminal 302 can calculate and obtain the position of the terminal 302 with high accuracy from the "position of the 1 st-1 st device", "position of the 1 st-2 nd device", "triangle formed by the 1 st-1 st device 301-1, 1 st-2 nd device 301-2 and the terminal 302".

However, the geodetic measurement method used by the terminal 302 to obtain the location/position information is not limited to the above description, and any method may be used to perform geodetic measurement. For example, examples of geodetic measurement methods include triangulation, multiangular measurement, trilateration, leveling, and the like.

As described above, the following effects can be obtained: by obtaining the above-described information from a plurality of devices including a light source that transmits location information, the terminal can estimate the position with high accuracy. Further, if the device including the light source for transmitting the location information is installed in a place where the satellite radio wave from the GPS is difficult to receive as described in embodiment 1, the following effects can be obtained: the terminal can safely obtain highly accurate position information by receiving a modulated signal transmitted from a device even in a place where radio waves from satellites of a GPS are difficult to receive.

In the above example, the example in which the terminal receives the modulated signals transmitted by 2 devices has been described, but the present invention can be similarly applied to the case in which the terminal receives modulated signals transmitted by more devices than 2 devices. Further, there is an advantage that the terminal can calculate position information with higher accuracy as the number of devices increases.

(embodiment mode 3)

Fig. 4 shows an example of the configuration of a device, a terminal, and, for example, a base station that communicates with the terminal, the device including a light source, illumination, a light source, and a lamp of visible light such as an LED, for example, according to the present embodiment. The device 400 of fig. 4 is provided with visible light, illumination, light sources, lights such as LEDs. In addition, this apparatus is named "1 st apparatus". In the 1 st equipment 400 of fig. 4, the same reference numerals are given to parts that operate similarly to the 1 st equipment 100 of fig. 1

The terminal 450 in fig. 4 shows the structure of the terminal, and the same reference numerals are given to the parts that operate similarly to fig. 1(b)

In the 1 st device 400 of fig. 4, the transmitter 101 receives as input, for example, information on a location or position 101, information 401-1 on an ssid (service set identifier), and information 401-2 on an access destination. The transmission unit 101 may also receive information 105 about time.

The transmitter 102 receives information on the location, information on the position 101, information on the SSID 401-1, information on the access destination 401-2, and/or information on the time 105 as inputs, generates an (optical) modulated signal based on these input signals, and outputs a modulated signal 103. And, for example, the modulated signal 103 is transmitted from the light source 104.

Since the description of embodiment 1 is given for an example of the information on the location or the information on the position 101, the description thereof is omitted here.

Next, information 401-1 on the SSID and information 401-2 on the access destination will be described.

First, SSID-related information 401-1 is explained.

The SSID-related information 401-1 is information of an SSID of a base station (or AP (access point)) 470 in fig. 4. Here, in the case where it is found that the SSID notified by the optical signal is the SSID of the secure base station, the 1 st apparatus 400 can provide the terminal 450 with access to the base station 470, which is the secure access destination. This provides an advantage that the terminal 450 of fig. 4 can securely obtain information from the base station (or AP) 470. On the other hand, the 1 st device 400 can restrict terminals accessing the base station 470 to terminals in a space where optical signals transmitted (irradiated) by the 1 st device 400 can be received.

When receiving the optical signal transmitted in the preset manner, the terminal 450 may determine that the notified SSID is the SSID of the safe base station, or may perform a process of determining whether the SSID is safe. For example, the 1 st device 400 may include a predetermined identifier in the optical signal and transmit the identifier, and the terminal may determine whether the notified SSID is the SSID of the secure base station based on the received identifier. Instead of performing the process of determining whether or not the base station is safe, the terminal 450 may select the 1 st device 400 with high safety by using the characteristics of the visible light, and the terminal 450 may receive the optical signal from the 1 st device 400 to acquire the SSID of the base station with high safety.

Note that, although only the base station (or AP)470 is shown in fig. 4, for example, when there is a base station (or AP) other than the base station (or AP)470, the terminal 450 in fig. 4 also accesses the base station (or AP)470 to obtain information.

The access destination information 401-2 is information on an access destination used for accessing the terminal 450 of fig. 4 to the base station (or AP)470 and then obtaining the information (a specific operation example will be described later).

The terminal 450 of fig. 4 receives the modulated signal transmitted by the 1 st device 400. Note that, in terminal 450 in fig. 4, the same reference numerals are given to portions that operate similarly to terminal 150 in fig. 1

The light receiving unit 151, such as an image sensor, e.g., CMOS or organic CMOS, included in the terminal 450 receives the modulation signal transmitted from the 1 st device 400. The receiving unit 153 receives the received signal 152 received by the light receiving unit 151 as an input, performs processing such as demodulation, error correction, and decoding of the received signal, and outputs received data 154.

The data analysis unit 155 receives the reception data 154 as input, estimates the location/position of the terminal from the reception data 154, for example, and outputs information 156 including at least location/position information of the terminal, information 451 relating to the SSID, and information 452 relating to the access destination.

The display unit 157 receives information 156 including location/position information of the terminal, information 451 relating to the SSID, and information 452 relating to the access destination, and displays, for example, the location/position of the terminal, the SSID of the communication partner accessed by the wireless device 453 included in the terminal 450, and the access destination (this display is named display No. 1).

For example, after the display of fig. 1, the wireless device 453 included in the terminal 450 in fig. 4 inputs SSID-related information 451 and access destination-related information 452. The wireless device 453 provided in the terminal 450 of fig. 4 is connected to a party performing communication, for example, by using radio waves, based on the information 451 concerning the SSID. In the case of fig. 4, wireless device 453 included in terminal 450 of fig. 4 is connected to base station 470.

The wireless device 453 included in the terminal 450 in fig. 4 generates a modulated signal from data including information about an access destination based on the information 452 about the access destination, and transmits the modulated signal to the base station 451 using radio waves, for example.

The base station (or AP)470 as the communication partner of the terminal in fig. 4(b) receives the modulated signal transmitted by the wireless device 453 provided in the terminal 450 in fig. 4. Then, the base station (or AP)470 performs processing such as demodulation, error correction decoding, and the like of the received modulated signal, outputs reception data 471 including information of the access destination transmitted by the terminal 450 in fig. 4, and based on the information of the access destination, the base station (or AP)470 accesses a desired access destination via the network and obtains desired information 472 from the access destination, for example.

Base station 470 receives desired information 472 as an input, generates a modulated signal from desired information 472, and transmits the modulated signal to terminal 450 in fig. 4 using, for example, radio waves.

Radio apparatus 453 of terminal 450 in fig. 4 receives the modulated signal transmitted by base station 470, and performs processing such as demodulation, error correction, and decoding to obtain desired information 472.

For example, it is assumed that the desired information 472 is a map, a map/floor guide of a building, a map/floor guide of a facility, a map/floor guide of a parking lot, information of "area/seat/store/facility" in a concert facility/stadium/airplane/airport lounge/railway/station, or the like.

The display unit 157 receives desired information 472, information 156 including at least location/position information of the terminal, and information 451 relating to the SSID as input, and displays the information 1, and then displays the location of the terminal mapped on the display of the map/floor guidance/facility information/seat information/store information, based on the desired information 472 and the information 156 including at least the location/position information of the terminal.

Fig. 5 shows a specific example of the display unit 157, the display of fig. 5 shows "floor 3", and it is assumed that each of a-1, a-2, a-3, a-4, a-21, a-22, a-23, and a-24 shows the position of the parking space of the car, α -1 and α -2 show the position of the elevator, the information of the map is assumed to be desired information 453, and as shown in fig. 5, the current position is displayed by being mapped onto the map, and at this time, the current position is information obtained from information 156 including at least the location/position information of the terminal.

Fig. 6 shows an example of a frame structure of a modulated signal transmitted by the 1 st device 400 of fig. 4. In fig. 6, the horizontal axis represents time, and symbols transmitting the same information as in fig. 2 are assigned the same reference numerals, and description thereof is omitted.

The 1 st device 400 transmits a symbol 600-1 regarding the SSID and a symbol 600-2 regarding the access destination in addition to the preamble 201, the control information symbol 202, the symbol 203 regarding the location information or the position information, and the symbol 204 regarding the time information.

In addition, the SSID-related symbol 600-1 is a symbol for transmitting the SSID-related information 401-1 of FIG. 4, and the access-destination-related symbol 600-2 is a symbol for transmitting the access-destination-related information 401-2 of FIG. 4. In the frame of fig. 6, symbols other than those shown in fig. 6 may be included. The frame structure including the transmission order of the symbols is not limited to the structure of fig. 6.

Fig. 7 shows an example of a frame configuration of a modulated signal transmitted by base station 470 in fig. 4, and the horizontal axis represents time. As shown in fig. 7, it is assumed that the base station 470 transmits, for example, a preamble 701, and then transmits control information symbols 702 and information symbols 703.

In this case, the preamble 701 is assumed to be a symbol used by a terminal receiving the modulated signal transmitted by the base station 470, for example, to perform signal detection, time synchronization, frame synchronization, frequency offset estimation, and the like.

Assume that the control information symbol 702 contains, for example: a method of an error correction coding scheme used in generating a modulated signal, information on a modulation scheme, information on a frame structure, and the like.

The information symbol 703 is a symbol for transmitting information. In the present embodiment, the information symbol 703 is a symbol for transmitting the desired information 472 described above.

The base station 470 in fig. 4 may transmit a frame including symbols other than the symbols shown in fig. 7 (for example, a frame including pilot symbols (reference symbols) in the middle of information symbols). The frame structure including the transmission order of the symbols is not limited to the structure of fig. 7. In fig. 7, a plurality of symbols may be present in the frequency axis direction, that is, a symbol may be present in a plurality of frequencies (a plurality of carriers).

For example, a method may be considered in which the modulated signal having the frame structure of fig. 6 transmitted from the 1 st device is transmitted at regular timing, for example, repeatedly. This enables the plurality of terminals to perform the operations described above.

Fig. 8 is a flowchart showing an example of processing performed by the "1 st device 400", the "terminal 450", and the "base station (or AP) 470" in fig. 4.

First, the 1 st device 400 of fig. 4 transmits a modulated signal of the frame structure of fig. 6 as 801 of fig. 8.

Next, as shown in 802 of fig. 8, the modulated signal transmitted by the 1 st device 400 of fig. 4 is received, and the terminal 450 of fig. 4 performs location/position estimation of the terminal.

Meanwhile, as 803 in fig. 8, the terminal 450 in fig. 4 receives the modulated signal transmitted from the 1 st device 400 in fig. 4 and grasps the SSID of the base station to which the terminal accesses.

Next, as indicated by 804 in fig. 8, the terminal 450 in fig. 4 transmits a modulated signal including data including information on an access destination for obtaining information such as a map to the base station (or AP)470 in fig. 4 using, for example, a radio wave.

As shown in 805 of fig. 8, the base station (or AP)470 receives the modulated signal transmitted from the terminal 450, obtains information of an access destination, and accesses a desired access destination via a network to obtain desired information such as a map.

As indicated by reference numeral 806 in fig. 8, the base station (or AP)470 in fig. 4 transmits a modulated signal including desired information such as the obtained map to the terminal 450 using, for example, radio waves.

As shown in 807 in fig. 8, the terminal 450 receives the modulated signal transmitted from the base station (or AP)470, and obtains information of a map (or the like). Then, the terminal 450 performs the display as shown in fig. 5 based on the map (or the like) information and the already obtained information of the location/position of the terminal.

Next, an operation example in the case where a plurality of the 1 st devices 400 and the base station (or AP)470 are installed in the location of fig. 5 will be described.

Fig. 9 shows a map of a certain location, as in fig. 5.

Fig. 9 is a map of "3 floors" as explained in fig. 5, a-1, a-2, a-3, a-4, a-21, a-22, a-23, and a-24 are parking spaces of cars, and α -1 and α -2 represent elevators.

The 1 st device having the same configuration as the device 100 of fig. 4 is provided at the position "○" 901-1 in fig. 9, the 1 st device having the same configuration as the device 100 of fig. 4 at the position 901-1 is named "the 1 st-1 st device", the 1 st-1 st device has information "a-1" as information on a place or information on a position, and the information "a-1" is transmitted as information on a place or information on a position.

The 1 st device having the same configuration as the device 100 of fig. 4 is provided at the position of "○" 901-2 of fig. 9, the 1 st device having the same configuration as the device 100 of fig. 4 at the position of 901-2 is named "the 1 st-2 nd device has information of" a-2 "as information on a place or information on a position, and the information of" a-2 "is transmitted as information on a place or information on a position.

The 1 st device having the same configuration as the device 100 of fig. 4 is provided at the position of "○" 901-3 of fig. 9, the 1 st device having the same configuration as the device 100 of fig. 4 at the position of 901-3 is named "the 1 st-3 rd device", the 1 st-3 rd device has information of "a-3" as information on a place or information on a position, and the information of "a-3" is transmitted as information on a place or information on a position.

The 1 st device having the same configuration as the device 100 of fig. 4 is provided at the position of "○" 901-4 of fig. 9, the 1 st device having the same configuration as the device 100 of fig. 4 at the position of 901-4 is named "the 1 st-4 th device", the 1 st-4 th device has information of "a-4" as information on a place or information on a position, and the information of "a-4" is transmitted as information on a place or information on a position.

The 1 st device having the same configuration as the device 100 of fig. 4 is provided at the position of "○" 901-21 of fig. 9, the 1 st device having the same configuration as the device 100 of fig. 4 at the position of 901-21 is named "the 1 st-21 st device has information of" a-21 "as information on a place or information on a position, and the information of" a-21 "is transmitted as information on a place or information on a position.

The 1 st device having the same configuration as the device 100 of fig. 4 is provided at the position of "○" 901-22 in fig. 9, the 1 st device having the same configuration as the device 100 of fig. 4 at the position of 901-22 is named "the 1 st-22 st device has information of" a-22 "as information on a place or information on a position, and the information of" a-22 "is transmitted as information on a place or information on a position.

The 1 st device having the same configuration as the device 100 of fig. 4 is provided at the position of "○" 901-23 of fig. 9, the 1 st device having the same configuration as the device 100 of fig. 4 at the position of 901-23 is named "the 1 st-23 st device has information of" a-23 "as information on a place or information on a position, and the information of" a-23 "is transmitted as information on a place or information on a position.

The 1 st device having the same configuration as the 1 st device 100 of fig. 4 is provided at the position of "○" 901-24 of fig. 9, the 1 st device having the same configuration as the 1 st device 100 of fig. 4 at the position of 901-24 is named "the 1 st-24 th device has information of" a-24 "as information on a place or information on a position, and the information of" a-24 "is transmitted as information on a place or information on a position.

Further, it is assumed that a base station (or AP) having the same configuration as that of the base station 470 of fig. 4 is provided at the position of "◎" 902 of fig. 9, and in this case, the SSID of the base station (or AP) having the same configuration as that of the base station 470 of fig. 4 at the position of 902 is assumed to be "abcdef".

When performing wireless communication, a terminal located around the position indicated by the map of fig. 9 accesses a base station (or AP) having the same configuration as that of 470 of fig. 4, which is installed at the position 902 of fig. 9. Thus, the "1 st-1 st device" provided at 901-1 of fig. 9 transmits "abcdef" as information on the SSID (refer to 401-1 of fig. 4).

Also, "1 st-2 nd device" provided at 901-2 of fig. 9 transmits "abcdef" as information on the SSID (refer to 401-1 of fig. 4).

The "1 st-3 rd devices" provided at 901-3 of fig. 9 transmit "abcdef" as information on the SSID (refer to 401-1 of fig. 4).

The "1 st-4 th device" provided at 901-4 of fig. 9 transmits "abcdef" as information on the SSID (refer to 401-1 of fig. 4).

The "1 st-21 st devices" provided at 901-21 of fig. 9 transmit "abcdef" as information on the SSID (refer to 401-1 of fig. 4).

The "1 st-22 nd devices" provided at 901-22 of fig. 9 transmit "abcdef" as information on the SSID (refer to 401-1 of fig. 4).

The "1 st-23 rd devices" provided at 901-23 of fig. 9 transmit "abcdef" as information on the SSID (refer to 401-1 of fig. 4).

The "1 st to 24 th devices" provided at 901 to 24 of fig. 9 transmit "abcdef" as information on the SSID (refer to 401-1 of fig. 4).

Specific operation examples are described below.

Assume that a terminal having the same structure as the terminal 450 of fig. 4 exists at the position 903-1 of fig. 9. Then, the terminal receives the modulated signal transmitted from the "1 st-4 th device" at the position 901-4 of fig. 9, and obtains the position information of "a-4". Further, the terminal obtains information of the SSID such as "abcdef", thereby accessing the base station (or AP) having the same configuration as the base station 470 of fig. 4 at 902 of fig. 9, and obtains information such as a map from the base station (or AP) having the same configuration as the base station 470 of fig. 4 at 902 of fig. 9. The terminal displays map information and position information (see fig. 5. however, fig. 5 is merely an example of display).

Assume that a terminal having the same structure as the terminal 450 of fig. 4 exists at the position 903-2 of fig. 9. Then, the terminal receives the modulated signal transmitted from the "1 st-22 nd devices" at the positions 901-22 of fig. 9, and obtains the position information of "a-22". Further, the terminal obtains information of the SSID such as "abcdef", thereby accessing the base station (or AP) having the same configuration as the base station 470 of fig. 4 at 902 of fig. 9, and obtains information such as a map from the base station (or AP) having the same configuration as the base station 470 of fig. 4 at 902 of fig. 9. The terminal displays map information and position information (see fig. 5. however, fig. 5 is merely an example of display).

The terminal stores the map (surrounding information) and the position information as shown in fig. 5 in a storage unit provided in the terminal, and if the user using the terminal takes out the stored information as needed, the user can use the map (surrounding information) and the position information more conveniently.

As described above, since the 1 st device transmits the modulated signal by the visible light, the terminal capable of receiving the modulated signal is limited to a range capable of receiving the signal light from the position of the 1 st device. Therefore, by receiving the location/position information transmitted from the 1 st device by the terminal, the terminal can obtain position information with high accuracy easily (without performing complicated signal processing). Further, if the 1 st device is installed in a place where the satellite radio wave from the GPS is difficult to receive, the terminal can also obtain the effect that the terminal can safely obtain highly accurate position information by receiving the modulated signal transmitted by the 1 st device even in a place where the satellite radio wave from the GPS is difficult to receive.

Further, the terminal can obtain information by connecting to the base station (or AP) based on the SSID information transmitted from the 1 st device, thereby obtaining information securely. This is because, when information is obtained from the modulated signal of the visible light, the user can easily recognize the 1 st device that transmitted the modulated signal because of the visible light, and can easily determine whether or not the information source is safe.

For example, when the SSID is obtained from a modulated signal of a radio wave transmitted from a wireless LAN, it is difficult for a user to identify a device that has transmitted the radio wave. Therefore, it is more preferable to acquire the SSID by visible light communication in order to secure the security of information.

In addition, a plurality of input signals may also be present in wireless device 453 of terminal 450 in fig. 4. For example, a control signal for controlling the wireless device 453 or information transmitted to the base station may be present as an input signal. In this case, an operation in which the wireless device 453 starts communication based on the control signal may be considered as an example. As described above, the configuration of the 1 st device is not limited to the configuration of the 1 st device 400 in fig. 4, and the configuration of the terminal is not limited to the configuration of the terminal 450 in fig. 4, and the connection destination and configuration of the base station 470 are not limited to those shown in fig. 4.

In fig. 4, although 1 base station (or AP) is described as being arranged, a plurality of (secure) base stations (or APs) that can be accessed by the terminal may be present. In this case, the SSID-related symbol transmitted by the 1 st device 400 in fig. 4 may include information indicating the SSIDs of the base stations (or APs) in which a plurality of base stations (or APs) exist. The terminal 450 in fig. 4 may select a base station (or AP) to be wirelessly connected (or may connect to a plurality of base stations (or APs)) based on the SSID information of a plurality of base stations.

For example, assume that there are 3 base stations (or APs). These are named base station # a, base station # B, and base station # C, respectively. The SSID of base station # a is "abcdef", the SSID of base station # B is "ghijk", and the SSID of base station # C is "pqrstu". Then, it is assumed that symbol 600-1 regarding the SSID in the frame structure of fig. 6 of the modulated signal transmitted by the 1 st device contains information regarding "set the SSID of base station # a to 'abcdef'," set the SSID of base station # B to 'ghijk', "set the SSID of base station # C to 'pqrstu'. Further, terminal 450 in fig. 4 receives symbol 600-1 concerning the SSID, and selects a base station (or AP) to be wirelessly connected based on information "set SSID of base station # a to 'abcdef'," set SSID of base station # B to 'ghijk', "set SSID of base station # C to 'pqrstu'.

(supplement)

It is needless to say that a plurality of the embodiments and other contents described in this specification may be combined and implemented.

Note that, although the embodiments are merely examples, for example, "modulation scheme, error correction coding scheme (used error correction code, code length, coding rate, and the like), control information, and the like" are exemplified, the embodiments can be implemented in the same configuration even when other "modulation scheme, error correction coding scheme (used error correction code, code length, coding rate, and the like), control information, and the like" are applied.

As for the modulation method, the embodiments and other contents described in the present specification can be implemented even if a modulation method other than the modulation method described in the present specification is used. For example, APSK (Amplitude phase Shift keying) (e.g., 16APSK, 64APSK, 128APSK, 256APSK, 1024APSK, 4096APSK, etc.), PAM (pulse Amplitude modulation) (e.g., 4PAM, 8PAM, 16PAM, 64PAM, 128PAM, 256PAM, 1024, 4096PAM, etc.), PSK (phase Shift keying) (e.g., BPSK, QPSK, 8PSK, 16PSK, 64PSK, 128PSK, 256PSK, 1024PSK, 4096PSK, etc.), QAM (quadrature Amplitude modulation) (e.g., 4QAM, 8QAM, 16QAM, 64QAM, 128QAM, 256QAM, 1024QAM, 4096QAM, etc.) and the like may be used, and uniform mapping and non-uniform mapping may be used in each modulation scheme. In addition, the arrangement method of the 2, 4, 8, 16, 64, 128, 256, 1024, and the like signal points in the I-Q plane (the modulation method of the 2, 4, 8, 16, 64, 128, 256, 1024, and the like signal points) is not limited to the signal point arrangement method of the modulation method described in this specification.

The device having a wireless device described in this specification may be, for example, a communication/broadcasting device such as a broadcasting station, a base station, an access point, a terminal, or a mobile phone (mobile phone), or a communication device such as a television, a radio, a terminal, a personal computer, a mobile phone, an access point, or a base station. The wireless device described in the present specification may be a device having a communication function and configured to be connectable to an apparatus for executing an application, such as a television, a radio, a personal computer, or a mobile phone, via some interface.

The device having a receiving unit described in the present specification may be, for example, a communication/broadcasting device such as a broadcasting station, a base station, an access point, a terminal, or a mobile phone (mobile phone), or a communication device such as a television, a radio, a terminal, a personal computer, a mobile phone, an access point, or a base station.

In the radio communication using radio waves according to the present embodiment, symbols other than data symbols, for example, pilot symbols (preamble, unique word, postamble, reference symbols, etc.), symbols for control information, and the like may be arranged in a frame. Here, the symbols are named as pilot symbols and control information symbols, but what kind of naming method is possible and what is important is the function itself.

The pilot symbol may be any known symbol modulated by PSK modulation in the transmitter/receiver (or may be a symbol transmitted by the transmitter when the receiver acquires synchronization and the receiver knows), and the receiver performs frequency synchronization, time synchronization, Channel estimation (CSI (Channel State Information)) of each modulated signal, detection of a signal, and the like using the known symbol.

The symbol for control information is a symbol for transmitting information (for example, a coding rate of a modulation scheme/error correction coding scheme used for communication, setting information in an upper layer, and the like) to be transmitted to a communication partner for realizing communication, in addition to data (for example, application).

The present invention is not limited to the embodiments, and can be implemented by being variously modified. For example, in each embodiment, a case of performing as a communication apparatus has been described, but the present invention is not limited to this, and the communication method may be performed as software.

For example, a program for executing the communication method may be stored in a rom (read only memory) and operated by a cpu (central Processor unit).

Further, a program for executing the above-described communication method may be stored in a storage medium readable by a computer, the program stored in the storage medium may be recorded in a ram (random Access memory) of the computer, and the computer may be caused to operate in accordance with the program.

The respective configurations of the above-described embodiments and the like may be typically realized as an lsi (large scale integration) which is an integrated circuit. These may be formed into 1 chip alone, or may be formed into 1 chip including all or a part of the structures of the respective embodiments. Here, the LSI is used, but depending on the difference in integration, it may be called ic (integrated circuit), system LSI, super LSI, or ultra LSI. The method of integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. An fpga (field Programmable Gate array) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure connection and setting of circuit cells inside LSI may be used. Furthermore, if a technique for realizing an integrated circuit instead of the LSI appears due to the progress of the semiconductor technology or another derivative technique, it is needless to say that the functional blocks may be integrated using this technique. Possibly biotechnological applications, etc.

(embodiment mode 4)

Fig. 10 is a diagram showing an example of the configuration of the communication system according to the present embodiment. The communication system of fig. 10 includes a device 1000 including a light source, illumination, a light source, and a lamp of visible light such as an LED, a terminal 1050, and a base station 470 for communicating with the terminal 1050, for example. The device 1000 of fig. 10 includes visible light such as an LED, illumination, a light source, and a lamp. This facility 1000 is named "2 nd facility" in the present embodiment. In the 2 nd apparatus 1000 of fig. 10, the same reference numerals are given to the components that operate in the same manner as the 1 st apparatus 100 of fig. 1.

In terminal 1050 in fig. 10, the same reference numerals are given to components that operate in the same manner as terminal 150 in fig. 1.

Note that radio waves are used for communication between wireless device 453 and base station 470 in fig. 10, for example.

In the 2 nd device 1000 of fig. 10, the transmission unit 101 receives information 1001-1 on the SSID, information 1001-2 on the encryption key, and data 1002 as input signals, generates a (optical) modulation signal based on these input signals, and outputs a modulation signal 103. And, for example, the modulated signal 103 is transmitted from the light source 104.

Next, information 1001-1 on the SSID and information 1001-2 on the encryption key will be described.

First, SSID-related information 1001-1 will be described.

The SSID-related information 1001-1 is information representing the SSID of the base station (or AP)470 in fig. 10. In addition, as an example, it is assumed that the base station (or AP)470 transmits a modulated signal by radio waves and receives a modulated signal by radio waves. That is, the 2 nd device 1000 can provide the terminal with access to the base station 470 as a secure access destination. This provides an advantage that the terminal 1050 in fig. 10 can securely obtain information from the base station (or AP) 470. On the other hand, the apparatus 1000 can restrict terminals accessed to the base station 470 to terminals in a space capable of receiving an optical signal transmitted (irradiated) by the apparatus 1000. When receiving the optical signal transmitted in the preset manner, the terminal 1050 may determine that the notified SSID is the SSID of the safe base station, or may perform a process of determining whether the SSID is safe. For example, the device 1000 may include a predetermined identifier in the optical signal and transmit the identifier, and the terminal may determine whether the notified SSID is the SSID of the secure base station based on the received identifier.

Although fig. 10 shows only the base station (or AP)470, the terminal 1050 in fig. 10 accesses the base station (or AP)470 and obtains information even if there is a base station (or AP) other than the base station (or AP)470, for example.

The information 1001-2 on the encryption key is information on the encryption key that the terminal 1050 of fig. 10 needs to communicate with the base station (or AP)470 in fig. 10, and the terminal 1050 of fig. 10 can communicate encrypted with the base station (or AP)470 by obtaining the information from the 2 nd device 1000 of fig. 10.

The terminal 1050 of fig. 10 receives the modulated signal transmitted by the 2 nd device 1000. Note that, in terminal 1050 in fig. 10, the same reference numerals are given to components that operate similarly to terminal 150 in fig. 1 and terminal 450 in fig. 4.

The light receiving unit 151 such as an image sensor such as a CMOS or organic CMOS included in the terminal 1050 receives the modulation signal transmitted from the 2 nd device 1000. The receiving unit 153 receives the received signal 152 received by the light receiving unit 151 as an input, performs processing such as demodulation, error correction, and decoding of the received signal, and outputs received data 154.

The data analysis unit 155 receives the reception data 154 as input, and outputs, for example, SSID information 1051 of a base station (470) as a connection destination and encryption key information 1052 for communicating with the base station (470) as the connection destination from the reception data. For example, in a wireless lan (local Area network), wep (wireless equipment privacy), WPA (Wi-Fi Protected Access), WPA2 (Wi-Fi Protected Access2) (PSK (Pre-red Key) mode, and eap (extended Authentication protocol) mode) are examples of encryption schemes. In addition, the encryption method is not limited thereto.

The display unit 157 receives the SSID information 1051 and the encryption key information 1052, and displays, for example, the SSID and the encryption key of the communication partner accessed by the wireless device 453 included in the terminal (this display is named "1 st display in the present embodiment").

For example, after the display of fig. 1, the wireless device 453 provided in the terminal 1050 in fig. 10 receives SSID information 1051 and encryption key information 1052, and establishes a connection (for example, assume that radio waves are used for connection) with the base station (or AP) 470. At this time, when communicating with wireless device 453 included in terminal 1050 in fig. 10, base station (or AP)470 transmits the modulated signal using radio waves, for example.

Then, the wireless device 453 included in the terminal 1050 in fig. 10 receives the data 1053 and the control signal 1054 as input, modulates the data 1053 under the control of the control signal 154, and transmits the modulated signal as a radio wave.

For example, the base station (or AP)470 transmits data to the network (471) and receives data from the network (472). Then, for example, it is assumed that base station (or AP)470 transmits a modulated signal as an electric wave to terminal 1050 in fig. 10.

The wireless device 453 included in the terminal 1050 in fig. 10 performs processing such as demodulation and error correction decoding on a modulated signal received as radio waves, and acquires received data 1056. The display unit 157 displays based on the received data 1056.

Fig. 11 shows an example of a frame configuration of a modulated signal transmitted by the 2 nd device 1000 of fig. 10. In fig. 11, the horizontal axis represents time, and the same symbols as those in fig. 2 and 6 are assigned the same reference numerals, and description thereof is omitted.

The SSID-related symbol 600-1 is a symbol for transmitting the SSID-related information 1001-1 of fig. 10, and the encryption-key-related symbol 1101 is a symbol for transmitting the encryption-key-related information 1001-2 of fig. 10. Data symbol 1102 is a symbol used to transmit data 1002.

The 2 nd device transmits a preamble 201, a control information symbol 202, a symbol 600-1 related to the SSID, a symbol 1101 related to the encryption key, and a data symbol 1102. Further, the 2 nd device 1000 of fig. 10 may transmit a frame including symbols other than those described in fig. 11. The frame structure including the order of transmitting symbols is not limited to the structure of fig. 11.

Fig. 12 shows an example of a frame configuration of a modulated signal transmitted by wireless device 453 included in terminal 1050 in fig. 10. In fig. 12, the horizontal axis represents time. As shown in fig. 12, for example, a radio device 453 provided in the terminal 1050 in fig. 10 transmits a preamble 1201, and then transmits a control information symbol 1202 and an information symbol 1203.

In this case, the preamble 1201 is a symbol used by the base station (or AP)470 for receiving the modulated signal transmitted by the wireless device 453 of the terminal 1050 in fig. 10, for example, to perform signal detection, time synchronization, frame synchronization, frequency offset estimation, and the like.

The control information symbol 1202 contains data such as a method of an error correction coding scheme used when generating a modulated signal, information on a modulation scheme, information on a frame structure, and information on a transmission method, and the base station (or AP)470 performs demodulation of a modulated signal based on the information contained in the control information symbol 1202.

Information symbol 1203 is a symbol used for wireless apparatus 453 of terminal 1050 of fig. 10 to transmit data.

Wireless device 453 of terminal 1050 in fig. 10 may transmit a frame including symbols other than the symbols shown in fig. 12 (e.g., a frame including pilot symbols (reference symbols) in the middle of information symbols). Further, the frame structure including the order of transmitting symbols is not limited to the structure of fig. 12. In fig. 12, a plurality of symbols may be present in the frequency axis direction, that is, a symbol may be present in a plurality of frequencies (a plurality of carriers).

In embodiment 3, the frame configuration of fig. 12 may be used when wireless device 453 included in terminal 1050 in fig. 4 transmits a modulated signal.

Fig. 7 shows an example of a frame configuration of a modulated signal transmitted by base station 470 in fig. 10. In fig. 7, the horizontal axis represents time. As shown in fig. 7, it is assumed that the base station 470 transmits, for example, a preamble 701, and then transmits control information symbols 702 and information symbols 703.

In this case, the preamble 701 is a symbol used by the radio apparatus 453 of the terminal 1050 in fig. 10 for receiving the modulated signal transmitted by the base station 470, and performs signal detection, time synchronization, frame synchronization, frequency offset estimation, and the like, for example.

Control information symbol 702 is data including, for example, a method of an error correction coding scheme used when generating a modulated signal, information on a modulation scheme, information on a frame structure, information on a transmission method, and the like, and radio apparatus 453 of terminal 1050 in fig. 10 demodulates a modulated signal based on the symbol information.

The information symbol 703 is a symbol for transmitting data by the base station (or AP)470 of fig. 10.

The base station (or AP)470 in fig. 10 may transmit a frame including symbols other than the symbols shown in fig. 7 (for example, a frame including pilot symbols (reference symbols) in the middle of information symbols). Further, the frame structure including the order of transmitting symbols is not limited to the structure of fig. 7. In fig. 7, a plurality of symbols may be present in the frequency axis direction, that is, a symbol may be present in a plurality of frequencies (a plurality of carriers).

Further, for example, a method of repeatedly transmitting the modulated signal having the frame structure of fig. 11 transmitted from the 2 nd device 1000 at regular timing, for example, is considered. This enables the plurality of terminals to perform the operations described above.

Fig. 13 is a flowchart showing an example of the processing performed by the "2 nd device 1000", "terminal 1050", and "base station (or AP) 470" in fig. 10.

First, the 2 nd device 1000 of fig. 10 transmits a modulated signal of the frame structure of fig. 11 as in 1301 of fig. 13.

Then, as shown in 1302 of fig. 13, the modulated signal transmitted by the 2 nd device 1000 of fig. 10 is received, and the terminal 1050 of fig. 10 acquires the SSID of the base station to which the terminal 1050 accesses.

Meanwhile, as in 1303 of fig. 13, the terminal 1050 of fig. 10 acquires an encryption key for communication with the base station 470 to which the terminal accesses.

Terminal 1050 in fig. 10 performs connection with base station 470 in fig. 10 through radio waves (1304).

In response to the base station 470 in fig. 10, the terminal 1050 in fig. 10 and the base station 470 in fig. 10 complete the connection as in 1305 in fig. 13.

As shown by 1306 in fig. 13, terminal 1050 in fig. 10 transmits information on a connection destination to base station 470 in fig. 10 by using radio waves.

Then, as in 1307 of fig. 13, the base station 470 of fig. 10 obtains information for transmission to the terminal 1050 of fig. 10 from the network.

Then, as shown in 1308 of fig. 13, base station 470 of fig. 10 transmits the obtained information to terminal 1050 of fig. 10 using radio waves, and terminal 1050 of fig. 10 obtains the information.

Terminal 1050 of fig. 10 obtains necessary information from the network via base station 470 of fig. 10, for example, when necessary.

As described above, the terminal connects to the base station (or AP) and acquires information based on the SSID information and the encryption key information transmitted from the 2 nd device, and thereby the following effects can be obtained: information can be securely obtained via a base station (or AP) whose security is guaranteed. This is because, when information is obtained from a modulated signal of visible light, it is easy for a user to determine whether or not an information source is safe because the information source is visible light.

For example, when the SSID is obtained from a modulated signal of a radio wave transmitted from a wireless LAN, it is difficult for a user to identify a device that has transmitted the radio wave. Therefore, it is more preferable to acquire the SSID by visible light communication in order to secure the security of information.

In addition, although the case where the 2 nd device transmits the information of the encryption key has been described in the present embodiment, for example, in the case where the base station (or AP) does not perform encrypted communication using the encryption key, the 2 nd device can be similarly implemented by transmitting only the information on the SSID without transmitting the information of the encryption key, and by removing the configuration on the encryption key.

The configuration of the 2 nd device is not limited to the configuration shown in fig. 10, and the configuration of the terminal is not limited to the configuration shown in fig. 10, and is not limited to fig. 10 regarding the connection destination and configuration method of the base station.

In the present embodiment, although fig. 10 shows a case where 1 base station (or AP) is disposed, a plurality of (secure) base stations (or APs) to which a terminal can access may be present (these base stations and terminals transmit and receive modulated signals using radio waves). In this case, the SSID-related symbol transmitted by the 2 nd device 1000 in fig. 10 may include information on the SSIDs of the base stations (or APs) in which a plurality of base stations (or APs) exist. Note that the symbol relating to the encryption key transmitted by the 2 nd device 1000 in fig. 10 may include information of the encryption key used for connection with each of the base stations (or APs) having a plurality of base stations. The terminal 1050 in fig. 10 may select a base station (or AP) to be wirelessly connected (for example, by radio waves) (or may connect to a plurality of base stations (or APs)) based on SSID information and encryption key information of a plurality of base stations.

For example, assume that there are 3 base stations (or APs). These are named base station # a, base station # B, and base station # C, respectively. The SSID of the base station # a is "abcdef", the SSID of the base station # B is "ghijk", the SSID of the base station # C is "pqrstu", the encryption key for connection to the base station # a is "123", the encryption key for connection to the base station # B is "456", and the encryption key for connection to the base station # C is "789".

Then, it is assumed that symbol 600-1 regarding the SSID in the frame structure of fig. 11 of the modulated signal transmitted by the 2 nd device contains information regarding "set the SSID of base station # a to 'abcdef'," set the SSID of base station # B to 'ghijk', "set the SSID of base station # C to 'pqrstu'. Further, it is assumed that a symbol 1101 concerning an encryption key in the frame configuration of fig. 11 includes information on "an encryption key for connection to the base station # a is set to '123'," an encryption key for connection to the base station # B is set to '456', "an encryption key for connection to the base station # C is set to '789'.

Further, terminal 1050 in fig. 10 receives symbol 600-1 relating to the SSID to obtain information "set SSID of base station # a to 'abcdef'," set SSID of base station # B to 'ghijk', "set SSID of base station # C to 'pqrstu'," receives symbol 1101 relating to the encryption key to obtain information "set encryption key for connection to base station # a to '123'," set encryption key for connection to base station # B to '456', "set encryption key for connection to base station # C to '789'. Based on these pieces of information, the terminal 1050 in fig. 10 selects and connects a base station (or AP) that is wirelessly connected (for example, by radio waves).

Further, as in the present embodiment, by setting the base station to which the terminal is to access by using the light source such as an LED, a special setting mode for performing a procedure for connecting the terminal to the base station is not required for the modulated signal for wireless transmission transmitted from the terminal, and a special setting mode for performing a procedure for connecting the terminal to the base station is not required for the modulated signal transmitted from the base station, whereby an effect of improving the data transmission efficiency of wireless communication can be obtained.

As described above, the encryption key may be an encryption key used for the SSID of the wireless LAN, or may be an encryption key used for restricting the connection mode, the service mode, the connection range of the network, or the like (that is, the encryption key may be introduced for some restriction).

(embodiment 5)

Here, the SSID and password separation will be described.

Fig. 14 shows an example of the configuration of a device, a terminal, and, for example, a base station for communicating with a terminal, which are provided with a light source of visible light such as an LED, an illumination, a light source, and a lamp according to this embodiment, and the communication system shown in fig. 14 includes devices 1400A and 1400B provided with a light source such as an LED, an illumination, a light source, and a lamp, a terminal 1050, and, for example, a base station 470 for communicating with a terminal 1050. The facility 1400A in fig. 14 is named "3 rd facility" in the present embodiment, and the facility 1400B in fig. 14 is named "4 th facility" in the present embodiment. Note that, in terminal 1050 in fig. 14, the same reference numerals are given to portions which operate similarly to fig. 1 and 10, and the same reference numerals as in fig. 4 are given to portions which operate similarly to fig. 4 also for the base station or the AP.

Further, it is assumed that radio waves are used for communication between wireless device 453 and base station 470 in fig. 14, for example.

In the 3 rd device 1400A of fig. 14, the transmission unit 1404-1 receives SSID-related information 1401-1 and data 1402-1 as input signals, generates a (optical) modulation signal based on these input signals, and outputs a modulation signal 1405-1. And, a modulated signal 1405-1 is transmitted from the light source 1406-1.

In the 4 th device 1400B of fig. 14, a transmitting section 1404-2 receives information 1403-2 and data 1402-2 on an encryption key as inputs, generates a (optical) modulated signal based on these input signals, and outputs a modulated signal 1405-2. And, a modulated signal 1405-2 is transmitted from light source 1406-2.

Next, information 1401-1 concerning the SSID and information 1403-2 concerning the encryption key will be described.

First, SSID-related information 1401-1 will be described.

SSID-related information 1401-1 is information indicating the SSID of the base station (or AP)470 in fig. 14. That is, the 3 rd device 1400A can provide the terminal with access to the base station 470 which is an access destination for security by radio waves. This provides an advantage that the terminal 1050 in fig. 14 can securely obtain information from the base station (or AP) 470.

In addition, the terminal 450 may determine that the notified SSID is the SSID of the safe base station when receiving the optical signal transmitted in the preset manner, or may perform a process of determining whether the SSID is safe. For example, the device 1400A may include a predetermined identifier in the optical signal and transmit the identifier, and the terminal may determine whether the notified SSID is the SSID of the secure base station based on the received identifier.

Note that although only the base station (or AP)470 is shown in fig. 14, the terminal 1050 in fig. 14 may access the base station (or AP)470 to obtain information even if there is a base station (or AP) other than the base station (or AP)470, for example.

The information 1403-2 on the encryption key is information on the encryption key that is necessary for the terminal 1050 in fig. 14 to perform communication with the base station (or AP)470 in fig. 14 via radio waves, and the terminal 1050 in fig. 14 can perform encrypted communication with the base station (or AP)470 by obtaining this information from the 4 th device 1400B in fig. 14.

First, the terminal 1050 of fig. 14 receives the modulated signal transmitted by the 3 rd device 1400A.

The light receiving unit 151, such as an image sensor, e.g., CMOS or organic CMOS, included in the terminal 1050 receives the modulation signal transmitted from the 3 rd device 1400A. The receiving unit 153 receives the received signal 152 received by the light receiving unit 151 as an input, performs processing such as demodulation, error correction, and decoding of the received signal, and outputs received data 154.

The data analysis unit 155 receives the reception data 154 as input, and outputs SSID information 1051 of a base station (470) as a connection destination from the reception data.

Therefore, the wireless device 453 provided in the terminal 1050 obtains the SSID information of the base station to which the wireless device 453 is connected by radio waves from the SSID information 1051.

Next, the terminal 1050 of fig. 14 receives the modulated signal transmitted by the 4 th device 1400B.

The light receiving unit 151, such as an image sensor, e.g., CMOS or organic CMOS, included in the terminal 1050 receives the modulation signal transmitted from the 4 th device 1400B. The receiving unit 153 receives the received signal 152 received by the light receiving unit 151 as an input, performs processing such as demodulation, error correction, and decoding of the received signal, and outputs received data 154.

The data analysis unit 155 receives the reception data 154 as an input, and outputs information 1052 of an encryption key used for communication with a base station (470) as a connection destination, for example, from the reception data. For example, in a wireless lan (local Area network), there are wep (wired Equivalent privacy), WPA (Wi-Fi Protected Access), WPA2 (Wi-Fi Protected Access2) (PSK (Pre-red Key) mode, and eap (extended authentication protocol) mode) as encryption schemes. In addition, the encryption method is not limited thereto.

Therefore, the wireless device 453 provided in the terminal 1050 obtains the information of the encryption key of the base station to which the wireless device 453 is connected, from the information 1052 of the encryption key used for communication with the base station (470) of the connection destination (for example, based on radio waves).

The display unit 157 receives SSID information 1051 and encryption key information 1052, and displays, for example, an SSID and an encryption key of a communication partner accessed by the wireless device 453 included in the terminal (this display is named "1 st display in the present embodiment").

For example, after the display of fig. 1, the wireless device 453 provided in the terminal 1050 in fig. 14 receives SSID information 1051 and encryption key information 1052, and establishes a connection with the base station (or AP)470 via radio waves (for example, assume that the connection uses radio waves). At this time, when communicating with wireless device 453 included in terminal 1050 in fig. 14, base station (or AP)470 transmits a modulated signal using radio waves, for example.

Then, the wireless device 453 provided in the terminal 1050 in fig. 14 receives the data 1053 and the control signal 1054 as input, modulates the data 153 in accordance with the control of the control signal 154, and transmits the modulated signal by radio waves.

For example, the base station (or AP)470 transmits data to the network (471) and receives data from the network (472). Then, for example, it is assumed that base station (or AP)470 transmits a modulated signal to terminal 1050 in fig. 14 via an electric wave.

Wireless device 453 included in terminal 1050 in fig. 14 demodulates the received modulated signal, performs error correction decoding and other processes, and obtains received data 1056. The display unit 157 displays based on the received data 1056.

Fig. 15 shows an example of a frame configuration of a modulated signal transmitted by the 3 rd device 1400A of fig. 14. In fig. 15, the horizontal axis represents time, and the same symbols as those in fig. 2, 6, and 11 are assigned the same reference numerals, and the description thereof is omitted.

The SSID-related symbol 600-1 is a symbol for transmitting SSID-related information 1401-1 of fig. 14. Data symbol 1102 is a symbol used to transmit data 1402-1.

The 3 rd device transmits a preamble 201, a control information symbol 202, a SSID related symbol 600-1, and a data symbol 1102. The 3 rd device 1400A of fig. 14 may transmit a frame including symbols other than those shown in fig. 15. Further, the frame structure including the order of transmitting symbols is not limited to the structure of fig. 15.

Fig. 16 shows an example of a frame configuration of a modulated signal transmitted by the 4 th device 1400B in fig. 14. In fig. 16, the horizontal axis represents time, and the same symbols as those in fig. 2 and 11 are assigned the same reference numerals, and description thereof is omitted.

A symbol 1101 concerning an encryption key is a symbol for transmitting the information 1403-2 concerning the encryption key of fig. 14. Data symbol 1102 is a symbol used to transmit data 1402-2.

The 4 th device transmits a preamble 201, a control information symbol 202, a symbol 1101 regarding an encryption key, and a data symbol 1102. The 4 th device 1400B in fig. 14 may transmit a frame including symbols other than those shown in fig. 16. Further, the frame structure including the order of transmitting symbols is not limited to fig. 16.

Fig. 12 shows an example of a frame configuration of a modulated signal transmitted by wireless device 453 included in terminal 1050 in fig. 14. In fig. 12, the horizontal axis represents time. As shown in fig. 12, for example, a radio device 453 provided in the terminal 1050 in fig. 14 transmits a preamble 1201, and then transmits a control information symbol 1202 and an information symbol 1203.

In this case, the preamble 1201 is a symbol used by the base station (or AP)470 for receiving the modulated signal transmitted by the wireless device 453 of the terminal 1050 in fig. 14, for example, to perform signal detection, time synchronization, frame synchronization, frequency offset estimation, and the like.

The control information symbol 1202 includes data such as a method of an error correction coding scheme used when generating a modulated signal, information on a modulation scheme, information on a frame structure, and information on a transmission method, and the base station (or AP)470 performs demodulation of the modulated signal based on the information included in the control information symbol 1202.

Information symbol 1203 is a symbol used for wireless apparatus 453 of terminal 1050 of fig. 14 to transmit data.

Wireless device 453 of terminal 1050 in fig. 14 may transmit a frame including symbols other than the symbols shown in fig. 12 (e.g., a frame including pilot symbols (reference symbols) in the middle of information symbols). Further, the frame structure including the order of transmitting symbols is not limited to the structure of fig. 12. In fig. 12, a plurality of symbols may be present in the frequency axis direction, that is, a symbol may be present in a plurality of frequencies (a plurality of carriers).

Fig. 7 shows an example of a frame configuration of a modulated signal transmitted by base station 470 in fig. 14. In fig. 7, the horizontal axis represents time. As shown in fig. 7, the base station 470 transmits, for example, a preamble 701, and then transmits control information symbols 702 and information symbols 703.

In this case, it is assumed that preamble 701 is a symbol for which wireless device 453 of terminal 1050 in fig. 10, which receives the modulated signal transmitted by base station 470, performs signal detection, time synchronization, frame synchronization, frequency offset estimation, and the like, for example.

Control information symbol 702 includes data such as a method of an error correction coding scheme used when generating a modulated signal, information on a modulation scheme, information on a frame structure, and information on a transmission method, and radio apparatus 453 of terminal 1050 in fig. 14 demodulates a modulated signal based on the symbol information.

The information symbol 703 is a symbol for transmitting data by the base station (or AP)470 of fig. 14.

The base station (or AP)470 in fig. 14 may transmit a frame including symbols other than the symbols shown in fig. 7 (for example, a frame including pilot symbols (reference symbols) in the middle of information symbols). Further, the frame structure including the order of transmitting symbols is not limited to the structure of fig. 7. In fig. 7, a plurality of symbols may be present in the frequency axis direction, that is, a symbol may be present in a plurality of frequencies (a plurality of carriers).

Further, for example, a method may be considered in which the modulated signal of the frame structure of fig. 15 transmitted by the 3 rd device 1400A is repeatedly transmitted at regular timing, for example. This enables the plurality of terminals to perform the operations described above.

Also, a method may be considered in which the modulated signal of the frame structure of fig. 16 transmitted by the 4 th device 1400B is transmitted at regular timing, for example, repeatedly. This enables the plurality of terminals to perform the operations described above.

Fig. 17 is a flowchart showing an example 1 of the processing performed by the "3 rd device 1400A", "4 th device 1400B", "terminal 1050", and "base station (or AP) 470" in fig. 14. In fig. 17, the same reference numerals are given to portions that operate similarly to fig. 13.

First, as 1701 of fig. 17, the 3 rd device 1400A of fig. 14 transmits a modulated signal of the frame structure of fig. 15.

Next, as indicated by 1702 in fig. 17, upon receiving the modulated signal transmitted from the 3 rd device 1400A in fig. 14, the terminal 1050 in fig. 14 acquires the SSID of the base station to which the terminal 1050 accesses.

Next, the 4 th device 1400B of fig. 14 transmits the modulated signal of the frame structure of fig. 16 as 1703 of fig. 17.

Then, as indicated by 1704 in fig. 17, the modulated signal transmitted by the 4 th device 1400B in fig. 14 is received, and the terminal 1050 in fig. 14 acquires an encryption key used for communication with the base station 470 to which the terminal has access.

Terminal 1050 in fig. 14 performs connection with base station 470 in fig. 14 through radio waves (1304).

In response to the response from base station 470 in fig. 14, terminal 1050 in fig. 14 and base station 470 in fig. 14 are connected to each other by radio waves as in 1305 in fig. 17.

As shown by 1306 in fig. 17, terminal 1050 in fig. 14 transmits information on a connection destination to base station 470 in fig. 14 using radio waves.

Then, as in 1307 of fig. 17, the base station 470 of fig. 14 obtains information for transmission to the terminal 1050 of fig. 14 from the network.

Next, as shown by reference numeral 1308 in fig. 17, the base station 470 in fig. 14 transmits the obtained information to the terminal 1050 in fig. 14 using radio waves, and the terminal 1050 in fig. 14 obtains the information.

Terminal 1050 of fig. 14 obtains necessary information from the network via base station 470 of fig. 14, for example, when necessary.

Fig. 18 is a flowchart showing an example 2 of the processing performed by the "3 rd device 1400A", "4 th device 1400B", "terminal 1050", and "base station (or AP) 470" in fig. 14. In fig. 18, the same reference numerals are given to portions that operate similarly to fig. 13.

First, the 4 th device 1400B of fig. 14 transmits a modulated signal of the frame structure of fig. 16 as 1801 of fig. 18.

Next, as in 1802 in fig. 18, the modulated signal transmitted by the 4 th device 1400B in fig. 14 is received, and the terminal 1050 in fig. 14 acquires an encryption key used for communication with the base station to which the terminal 1050 has access.

Next, as in 1803 of fig. 18, the 3 rd device 1400A of fig. 14 transmits a modulated signal of the frame structure of fig. 15.

Then, as indicated by 1804 in fig. 18, the modulated signal transmitted from the 3 rd device 1400A in fig. 14 is received, and the terminal 1050 in fig. 14 acquires the SSID of the base station 470 to which the terminal accesses.

Next, terminal 1050 in fig. 14 performs connection with base station 470 in fig. 14 through radio waves (1304).

In response to the response from base station 470 in fig. 14, terminal 1050 in fig. 14 and base station 470 in fig. 14 are connected to each other by radio waves as in 1305 in fig. 18.

As shown by 1306 in fig. 18, terminal 1050 in fig. 14 transmits information of a connection destination to base station 470 in fig. 14 using radio waves.

Then, as in 1307 of fig. 18, the base station 470 of fig. 14 obtains information for transmission to the terminal 1050 of fig. 14 from the network.

Then, as shown in reference numeral 1308 in fig. 18, the base station 470 in fig. 14 transmits the obtained information to the terminal 1050 in fig. 14 using radio waves, and the terminal 1050 in fig. 14 obtains the information.

Terminal 1050 in fig. 14 acquires necessary information from the network via base station 470 in fig. 14, for example, when necessary.

As described above, the terminal connects to the base station (or AP) and acquires information based on the SSID information and the encryption key information transmitted from the 3 rd device and the 4 th device, thereby obtaining an effect that information can be securely acquired via the base station (or AP) whose security is guaranteed. This is because, when information is obtained from a modulated signal of visible light, it is easy for a user to determine whether or not an information source is safe because the information source is visible light.

For example, when the SSID is obtained from a modulated signal of a radio wave transmitted from a wireless LAN, it is difficult for a user to identify a device that has transmitted the radio wave. Therefore, it is more preferable to acquire the SSID by visible light communication in order to secure the security of information.

In addition, although the case where the 4 th device transmits the information of the encryption key has been described in the present embodiment, for example, in the case where the base station (or AP) does not perform encrypted communication using the encryption key, the 4 th device can be similarly implemented by transmitting only the information on the SSID without transmitting the information on the encryption key and by removing the structure of the encryption key.

Further, as in the present embodiment, by separating the device that transmits information on the SSID from the device that transmits information on the encryption key, the terminal can achieve more secure communication with the base station.

For example, consider a space as shown in fig. 19. As shown in fig. 19, it is assumed that there are a region #1 and a region #2, and there are an entrance and a wall between the region #1 and the region # 2. It is assumed that the movement from the area #1 to the area #2 and the movement from the area #2 to the area #1 can be performed only from the entrance/exit.

In area #1 of fig. 19, a base station (or AP) is provided, and the 3 rd device and the 4 th device are provided. On the other hand, it is assumed that only the 3 rd device is set in the area # 2.

It is assumed that the radio wave transmitted by the base station (or AP) can be received in both of the area #1 and the area # 2. At this time, the terminal existing in the area #1 in which the 4 th device is provided can communicate with the base station. In addition, even when a terminal connected to the base station in the area #1 moves to the area #2, the terminal can communicate with the base station.

When a terminal connected to the base station in the area #1 moves to an area other than the area #1 or the area #2 and then returns to any one of the area #1 and the area #2, communication with the base station is enabled.

On the other hand, a terminal that cannot enter the area #1 cannot obtain an encryption key. In this case, the terminal knows only the SSID of the base station (or AP). In this case, the terminal may be subjected to communication with the base station based on a service that can be enjoyed only by knowing the SSID.

Therefore, only the terminal that has entered the area #1 can communicate with the base station, and thus, the security of communication can be ensured. Further, it is also possible to construct a system capable of providing different services for each area.

Further, by changing an encryption key used by the terminal for communication with the base station (for example, in a certain time interval), communication with the base station is no longer possible with the encryption key before the change, and by performing such an operation, more secure communication can be performed.

As described above, the encryption key may be an encryption key used for the SSID of the wireless LAN, or may be an encryption key used for restricting the connection mode, the service mode, the connection range of the network, or the like (that is, the encryption key may be introduced for some restriction).

The configuration of the 3 rd device and the configuration of the 4 th device are not limited to the configurations shown in fig. 14, and the configuration of the terminal is not limited to the configuration shown in fig. 14, and the connection destination and the configuration method of the base station are not limited to fig. 14.

In the present embodiment, although fig. 14 shows a case where 1 base station (or AP) is arranged, a plurality of (secure) base stations (or APs) to which the terminal can access may be provided. In this case, the SSID-related symbol transmitted by the 3 rd device 1400A in fig. 14 may include information on the SSIDs of the base stations (or APs) in which a plurality of SSID exist. Note that the symbol relating to the encryption key transmitted by the 4 th device 1400B in fig. 14 may include information of the encryption key used for connection with each of the base stations (or APs) having a plurality of base stations. The terminal 1050 in fig. 14 may select a base station (or AP) to be wirelessly connected (or may connect to a plurality of base stations (or APs)) based on SSID information and encryption key information of a plurality of base stations.

For example, assume that there are 3 base stations (or APs). These are named base station # a, base station # B, and base station # C, respectively. The SSID of the base station # a is "abcdef", the SSID of the base station # B is "ghijk", the SSID of the base station # C is "pqrstu", the encryption key for connection to the base station # a is "123", the encryption key for connection to the base station # B is "456", and the encryption key for connection to the base station # C is "789".

Then, it is assumed that symbol 600-1 regarding the SSID in the frame structure of fig. 15 of the modulated signal transmitted by the 3 rd apparatus contains information regarding "set the SSID of base station # a to 'abcdef'," set the SSID of base station # B to 'ghijk', "set the SSID of base station # C to 'pqrstu'. Further, it is assumed that a symbol 1101 concerning an encryption key in the frame configuration of fig. 15 of the modulated signal transmitted by the 4 th device includes information on "an encryption key for connection with the base station # a is set to '123'," an encryption key for connection with the base station # B is set to '456', "an encryption key for connection with the base station # C is set to '789'.

Further, terminal 1050 in fig. 14 receives symbol 600-1 relating to the SSID to obtain information "set SSID of base station # a to 'abcdef'," set SSID of base station # B to 'ghijk', "set SSID of base station # C to 'pqrstu'," receives symbol 1101 relating to the encryption key to obtain information "set encryption key for connection to base station # a to '123'," set encryption key for connection to base station # B to '456', "set encryption key for connection to base station # C to '789'. Based on this information, the terminal 1050 in fig. 14 selects a base station (or AP) to be connected wirelessly and connects.

Further, as in the present embodiment, by setting the base station to which the terminal is to access by using the light source such as an LED, a special setting mode for performing a procedure for connecting the terminal to the base station is not required for the modulated signal for wireless transmission transmitted from the terminal, and a special setting mode for performing a procedure for connecting the terminal to the base station is not required for the modulated signal transmitted from the base station, whereby an effect of improving the data transmission efficiency of wireless communication can be obtained.

(embodiment mode 6)

Here, an example in which a base station and an LED are mounted on the base station will be described.

Fig. 20 is a diagram showing an example of the configuration of the communication system according to the present embodiment. The communication system shown in fig. 20 includes a visible light source such as an LED, an illumination, a light source, and a lamp, and further includes a base station 2000 including a wireless device 2001 and a terminal 1050. In fig. 20, the same reference numerals are given to portions that operate similarly to fig. 1 and 10.

Note that, for example, radio waves are used for communication between the wireless device 2001 and the wireless device 453 in fig. 20.

The base station (or AP)2000 in fig. 20 includes visible light such as an LED, illumination, a light source, and a lamp. First, the operation of a part related to visible light, illumination, a light source, and a lamp such as an LED will be described.

The transmission unit 101 receives information 1001-1 on the SSID, information 1001-2 on the encryption key, and data 1002 as input signals, generates a (optical) modulation signal based on these input signals, and outputs a modulation signal 103. And, for example, the modulated signal 103 is transmitted from the light source 104.

Next, information 1001-1 on the SSID and information 1001-2 on the encryption key will be described.

First, SSID-related information 1001-1 will be described.

The SSID-related information 1001-1 is information indicating the SSID of the wireless device 2001 using radio waves, for example, of the base station (or AP)2000 in fig. 20. That is, "a portion associated with visible light such as an LED, illumination, a light source, or a lamp" can provide the terminal with access to the wireless device 2001 which is a secure wireless access destination. This provides an effect that the terminal 1050 in fig. 20 can securely obtain information from the wireless device 2001.

On the other hand, the portion of the base station 200 associated with the visible light, illumination, light source, and lamp such as the LED can limit the terminal that accesses the wireless device 2001 to a terminal in a space that can receive the optical signal transmitted (illuminated) by the portion of the base station 200 associated with the visible light, illumination, light source, and lamp such as the LED. In addition, the terminal 1050 may determine that the notified SSID is the SSID of the safe base station when receiving the optical signal transmitted in the preset manner, or may perform a process of determining whether it is safe. For example, a predetermined identifier may be included in the optical signal and transmitted from a portion of the base station 200 associated with visible light, illumination, a light source, or a lamp such as an LED, and the terminal may determine whether the notified SSID is a safe SSID of the base station based on the received identifier.

Note that, although only the base station (or AP)2000 is shown in fig. 20, the terminal 1050 in fig. 20 accesses the base station (or AP)2000 to obtain information even if there is a base station (or AP) other than the base station (or AP)2000, for example.

The information 1001-2 relating to the encryption key is information relating to the encryption key that the terminal 1050 in fig. 20 needs to communicate with the wireless device 2001 in fig. 20, and the terminal 1050 in fig. 20 can communicate encrypted with the wireless device 2001 by obtaining the information from a part related to visible light such as an LED, lighting, a light source, or a lamp. Terminal 1050 of fig. 20 receives a modulated signal transmitted from a portion of base station 200 associated with visible light, illumination, light source, lamp, etc. of an LED or the like.

Note that, in terminal 1050 in fig. 20, the same reference numerals are given to components that operate in the same manner as terminal 150 in fig. 1 and terminal 1050 in fig. 10.

The light receiving unit 151, such as an image sensor, for example, a CMOS or organic CMOS, included in the terminal 1050 receives a modulation signal transmitted from a portion related to visible light, illumination, a light source, or a lamp, such as an LED, in the base station 200. The receiving unit 153 receives the received signal 152 received by the light receiving unit 151 as an input, performs processing such as demodulation, error correction, and decoding of the received signal, and outputs received data 154.

The data analysis unit 155 receives the reception data 154 as input, and outputs, for example, SSID information 1051 of the wireless device 2001 as a connection destination base station and encryption key information 1052 for communicating with the wireless device 2001 as a connection destination base station from the reception data. For example, in a wireless lan (local Area network), there are wep (wired Equivalent privacy), WPA (Wi-Fi Protected Access), WPA2 (Wi-Protected Access2) (PSK (Pre-red Key) mode, and eap (extended authentication protocol) mode) as encryption schemes. In addition, the encryption method is not limited thereto.

The display unit 157 receives SSID information 1051 and encryption key information 1052, and displays, for example, an SSID and an encryption key of a communication partner accessed by the wireless device 453 included in the terminal (this display is named "1 st display in the present embodiment").

For example, after the description of fig. 1, the wireless device 453 provided in the terminal 1050 in fig. 20 receives SSID information 1051 and encryption key information 1052, and establishes a connection (for example, if the connection uses radio waves) with the wireless device 2001 of the base station (or AP) 2000. At this time, the wireless device 2001 of the base station (or AP)2000 transmits a modulated signal using radio waves, for example, also when communicating with the wireless device 453 included in the terminal 1050 in fig. 20.

Then, the wireless device 453 provided in the terminal 1050 in fig. 20 receives the data 1053 and the control signal 1054 as input, modulates the data 1053 in accordance with the control of the control signal 154, and transmits the modulated signal as a radio wave. Wireless device 2001, e.g., base station (or AP)2000, transmits data to the network 471 and receives data from the network 472. Then, for example, the wireless apparatus 2001 of the base station (or AP)2000 transmits the modulated signal as a radio wave to the terminal 1050 in fig. 20. The wireless device 453 included in the terminal 1050 in fig. 20 performs processing such as demodulation, error correction decoding, and the like on a modulated signal received as radio waves, and acquires received data 1056. The display unit 157 displays based on the received data 1056.

Fig. 11 shows an example of a frame configuration of a modulated signal transmitted by wireless device 2001 of base station (or AP)2000 in fig. 20. In fig. 11, the horizontal axis represents time, and the same symbols as those in fig. 2 and 6 are assigned the same reference numerals, and description thereof is omitted.

The SSID-related symbol 600-1 is a symbol for transmitting the SSID-related information 1001-1 of fig. 20, and the encryption-key-related symbol 1101 is a symbol for transmitting the encryption-key-related information 1001-2 of fig. 20. Data symbol 1102 is a symbol used to transmit data 1002.

The wireless device 2001 of the base station (or AP)2000 transmits a preamble 201, a control information symbol 202, a symbol 600-1 relating to the SSID, a symbol 1101 relating to the encryption key, and a data symbol 1102. In addition, wireless device 2001 of base station (or AP)2000 in fig. 20 may transmit a frame including symbols other than those shown in fig. 11. The frame structure including the order of transmitting symbols is not limited to the structure of fig. 11.

Fig. 12 shows an example of a frame configuration of a modulated signal transmitted by wireless device 453 included in terminal 1050 in fig. 20. In fig. 12, the horizontal axis represents time. As shown in fig. 12, for example, a radio device 453 provided in the terminal 1050 in fig. 20 transmits a preamble 1201, and then transmits a control information symbol 1202 and an information symbol 1203.

In this case, the preamble 1201 is a symbol used by the radio apparatus 2001 of the base station (or AP)2000 which receives the modulated signal transmitted by the radio apparatus 453 of the terminal 1050 in fig. 20, for example, to perform signal detection, time synchronization, frame synchronization, frequency offset estimation, and the like.

The control information symbol 1202 contains data such as a method of error correction coding used for generating a modulated signal, information on a modulation scheme, information on a frame structure, and information on a transmission method, and the wireless device 2001 of the base station (or AP)2000 performs demodulation of the modulated signal based on the information contained in the control information symbol 1202.

Information symbol 1203 is a symbol used for wireless apparatus 453 of terminal 1050 in fig. 20 to transmit data.

Wireless device 453 of terminal 1050 in fig. 20 may transmit a frame including symbols other than the symbols shown in fig. 12 (e.g., a frame including pilot symbols (reference symbols) in the middle of information symbols). Further, the frame structure including the order of transmitting symbols is not limited to the structure of fig. 12. In fig. 12, a plurality of symbols may be present in the frequency axis direction, that is, a symbol may be present in a plurality of frequencies (a plurality of carriers).

Fig. 7 shows an example of a frame configuration of a modulated signal transmitted by the radio apparatus 2001 in fig. 20. In fig. 7, the horizontal axis represents time. As shown in fig. 7, it is assumed that the base station 470 transmits, for example, a preamble 701, and then transmits control information symbols 702 and information symbols 703.

In this case, the preamble 701 is assumed to be a symbol used by the radio apparatus 453 of the terminal 1050 in fig. 2 that receives the modulated signal transmitted by the radio apparatus 2001 in fig. 20, and performs signal detection, time synchronization, frame synchronization, frequency offset estimation, and the like, for example.

Control information symbol 702 includes data such as a method of an error correction coding scheme used when generating a modulated signal, information on a modulation scheme, information on a frame structure, and information on a transmission method, and radio apparatus 453 of terminal 1050 in fig. 20 demodulates a modulated signal based on the symbol information.

Information symbol 703 is a symbol used for transmitting data by wireless apparatus 2001 in fig. 20.

Radio apparatus 2001 of base station 2000 in fig. 20 may transmit a frame including symbols other than the symbols shown in fig. 7 (for example, a frame including pilot symbols (reference symbols) in the middle of information symbols). Further, the frame structure including the order of transmitting symbols is not limited to the structure of fig. 7. In fig. 7, a plurality of symbols may be present in the frequency axis direction, that is, a symbol may be present in a plurality of frequencies (a plurality of carriers).

For example, a method may be considered in which the modulated signal of the frame structure in fig. 11 transmitted by a part related to visible light such as an LED, illumination, a light source, or a lamp in the base station 200 is repeatedly transmitted at regular timing, for example. This enables the plurality of terminals to perform the operations described above.

Fig. 21 is a flowchart showing an example of the processing performed by the "part related to visible light such as an LED, illumination, a light source, or a lamp", "terminal 1050", and "wireless device 2001 of a base station (or AP)" in fig. 20.

First, as shown in 1301 of fig. 13, the part related to the visible light, illumination, light source, and lamp of the LED and the like in fig. 20 transmits the modulation signal of the frame structure in fig. 11.

Next, as shown in 1302 of fig. 13, the modulated signal transmitted from the part related to the visible light such as LED, illumination, light source, and lamp in fig. 20 is received, and the terminal 1050 in fig. 20 acquires the SSID of the base station to which the terminal 1050 is to access.

Meanwhile, as in 1303 of fig. 13, the terminal 1050 of fig. 20 acquires an encryption key used in communication with the base station 470 to which the terminal is to access.

Terminal 1050 in fig. 20 performs connection with radio device 2001 in base station 2000 in fig. 20 through radio waves (1304).

In response to the response from the radio apparatus 2001 of the base station 2000 in fig. 20, the terminal 1050 in fig. 20 completes the connection with the radio apparatus 2001 of the base station 2000 in fig. 20 as in 1305 in fig. 13.

Next, as shown in 1306 in fig. 13, terminal 1050 in fig. 20 transmits information of a connection destination to wireless device 2001 of base station 2000 in fig. 20 using radio waves.

Then, as in 1307 of fig. 13, wireless apparatus 2001 of base station 2000 of fig. 20 obtains information for transmission to terminal 1050 of fig. 20 from the network.

Then, as shown by reference numeral 1308 in fig. 13, radio apparatus 2001 of base station 2000 in fig. 20 transmits the obtained information to terminal 1050 in fig. 20 using radio waves, and terminal 1050 in fig. 20 obtains the information.

Terminal 1050 in fig. 20 acquires necessary information from the network via wireless apparatus 2001 of base station 2000 in fig. 20, for example, when necessary.

As described above, the terminal connects to the wireless device of the base station (or AP) and acquires information based on SSID information and encryption key information transmitted from a portion of the base station associated with visible light such as an LED, illumination, a light source, and a lamp, and thereby can obtain an effect of being able to securely acquire information via the base station (or AP) whose security is guaranteed. This is because, when information is obtained from a modulated signal of visible light, since the information is visible light, a user can easily determine whether or not the information source is safe.

For example, when the SSID is obtained from a modulated signal of a radio wave transmitted from a wireless LAN, it is difficult for a user to identify a device that has transmitted the radio wave. Therefore, it is more preferable to acquire the SSID by visible light communication in order to secure the security of information.

In addition, in the present embodiment, a case has been described in which the part of the base station associated with the visible light, illumination, light source, and lamp such as the LED transmits the information of the encryption key, but for example, in a case where the wireless device of the base station (or AP) does not perform encrypted communication using the encryption key, the part of the base station associated with the visible light, illumination, light source, and lamp such as the LED does not transmit the information of the encryption key but transmits only the information on the SSID, and the same implementation can be performed by simply removing the configuration of the encryption key.

As shown in fig. 20, the SSID and the encryption key of the wireless device 2001 of the base station 2000 may be rewritten. For example, in fig. 20, the wireless device 2001 has, as inputs, SSID-related information 1001-1 and encryption key-related information 1001-2. The wireless device 2001 of the base station 2000 rewrites the SSID and the encryption key based on the SSID-related information 1001-1 and the encryption key-related information 1001-2, which are input. With such a configuration, the security of communication between the terminal and the wireless device 2001 of the base station 2000 is further ensured (however, in fig. 20, the wireless device 2001 of the base station 2000 has a function of rewriting the SSID and the encryption key, but may have a configuration without such a function).

The configuration of the portion of the base station related to the visible light such as the LED, the illumination, the light source, and the lamp is not limited to the configuration shown in fig. 20, and the configuration of the terminal is not limited to the configuration shown in fig. 20, and the connection destination and the configuration method of the wireless device of the base station are not limited to fig. 20.

In the present embodiment, although fig. 20 shows a case where 1 base station (or AP) is arranged, a plurality of wireless devices of a (secure) base station (or AP) to which a terminal can access may be present (in addition, the wireless devices of the base stations and the terminal perform transmission and reception of a modulated signal using radio waves). In this case, the SSID-related symbols transmitted by the sections associated with the visible light, illumination, light source, and lamp such as the LED in fig. 20 may include information on the SSIDs of the wireless devices in which a plurality of base stations (or APs) are present. Note that the symbol relating to the encryption key transmitted by the part related to the visible light, illumination, light source, and lamp such as the LED in fig. 20 may include information of the encryption key used for connection to each base station of the wireless apparatuses in which a plurality of base stations (or APs) are present. The terminal 1050 in fig. 20 may select a wireless device of a base station (or AP) to be wirelessly connected (for example, by radio waves) based on SSID information and encryption key information of a wireless device in which a plurality of base stations exist (or may be connected to wireless devices in a plurality of base stations (or APs)).

For example, assume that there are 3 base stations (or APs) having wireless devices. These are named as radio apparatus # a, radio apparatus # B, and radio apparatus # C, respectively. The SSID of the wireless device # a is "abcdef", the SSID of the wireless device # B is "ghijk", the SSID of the wireless device # C is "pqrstu", the encryption key for connection to the wireless device # a is "123", the wireless device for connection to the wireless device # B is "456", and the encryption key for connection to the wireless device # C is "789".

Then, it is assumed that symbol 600-1 concerning the SSID in the frame structure of fig. 11 of the modulation signal transmitted by the portion of base station 200 associated with the visible light, illumination, light source, and lamp of the LED or the like contains information on "set the SSID of wireless device # a to" abcdef ",", "set the SSID of wireless device # B to" ghijk '", and" set the SSID of wireless device # C to "pqrstu'". Further, it is assumed that a symbol 1101 regarding an encryption key in the frame configuration of fig. 11 includes information regarding "an encryption key for connection with the wireless apparatus # a is set to '123'," an encryption key for connection with the wireless apparatus # B is set to '456', "an encryption key for connection with the wireless apparatus # C is set to '789'.

Further, terminal 1050 in fig. 20 receives symbol 600-1 relating to the SSID to obtain information "set the SSID of wireless device # a to 'abcdef'," set the SSID of wireless device # B to 'ghijk', "set the SSID of wireless device # C to 'pqrstu'," and receives symbol 1101 relating to the encryption key to obtain information "set the encryption key used for connection to wireless device # a to '123'," set the encryption key used for connection to wireless device # B to '456', "set the encryption key used for connection to wireless device # C to '789'. Based on these pieces of information, terminal 1050 in fig. 20 selects and connects a base station (or AP) that is wirelessly connected (for example, by radio waves).

Further, as in the present embodiment, by setting the wireless device of the base station to which the terminal is to access using the light source such as an LED, a mode for performing a procedure for connecting the terminal to the base station is not required in the modulated signal for wireless transmission transmitted from the terminal, and a mode for performing a procedure for connecting the terminal to the base station is not required in the modulated signal transmitted from the base station, whereby an effect of improving the data transfer efficiency of wireless communication can be obtained.

As described above, the encryption key may be an encryption key used for the SSID of the wireless LAN, or an encryption key used for restricting the connection mode, the service mode, the connection range of the network, or the like (that is, the encryption key may be introduced for some restriction).

(embodiment 7)

Here, an example in which there are a plurality of base stations and access control is performed will be described.

Fig. 22 is a diagram showing an example of the configuration of the communication system according to the present embodiment. The communication system of fig. 22 includes a device 1000 including a light source of visible light such as an LED, lighting, a light source, and a lamp, a terminal 1050, and, for example, 470-1 base station #1, 470-2 base station #2, and 470-3 base station #3 which communicate with the terminal 1050. In fig. 22, the same reference numerals are given to portions that operate similarly to fig. 1, 4, and 10.

The device 1000 in fig. 22 includes visible light such as an LED, illumination, a light source, and a lamp. This facility 1000 is named "5 th facility" in the present embodiment. In fig. 22, for example, radio waves are used for communication between the wireless device 453 and the 470-1 base station #1, communication between the wireless device 453 and the 470-2 base station #2, and communication between the wireless device 453 and the 470-3 base station #.

In the 5 th device 1000 in fig. 22, the transmission unit 101 receives information 1001-1 on the SSID, information 1001-2 on the encryption key, and data 1002 as input signals, generates a (optical) modulation signal based on these input signals, and outputs a modulation signal 103. And, for example, the modulated signal 103 is transmitted from the light source 104.

Next, information 1001-1 on the SSID and information 1001-2 on the encryption key will be described.

First, SSID-related information 1001-1 will be described.

The SSID-related information 1001-1 is, for example, information indicating the SSID of the 470-1 base station (or AP) in fig. 22, information indicating the SSID of the 470-2 base station (or AP), and information indicating the SSID of the 470-3 base station (or AP). Further, as an example, it is assumed that 470-1, 470-2, and 470-3 base stations (or APs) transmit modulated signals by radio waves and receive modulated signals by radio waves. That is, the 5 th device 1000 can provide the terminal with access to the base stations 470-1, 470-2, 470-3 as the secure access destinations. Thus, the terminal 1050 of fig. 22 can obtain an effect of being able to securely obtain information from the base stations (or APs) 470-1, 470-2, and 470-3.

On the other hand, the device 1000 can restrict terminals accessing the base stations 470-1, 470-2, 470-3 to terminals in a space that can receive optical signals transmitted (illuminated) by the device 1000. In addition, the terminal 1050 may determine that the notified SSID is the SSID of the safe base station when receiving the optical signal transmitted in the preset manner, or may perform a process of determining whether it is safe. For example, the device 1000 may include a predetermined identifier in the optical signal and transmit the identifier, and the terminal may determine whether the notified SSID is the SSID of the secure base station based on the received identifier.

In addition, although the base stations (or APs) 470-1, 470-2, and 470-3 are shown in fig. 22, base stations (or APs) other than the base stations (or APs) 470-1, 470-2, and 470-3 may be present.

The information 1001-2 on the encryption key is information on the encryption key that the terminal 1050 of fig. 22 needs in order to communicate with the base stations (or APs) 470-1, 470-2, 470-3 of fig. 22, and the terminal 1050 of fig. 22 can perform encrypted communication between "between the terminal and the base station (or AP) 470-1", "between the terminal and the base station (or AP) 470-2", and "between the terminal and the base station (or AP) 470-3" by obtaining the information from the 5 th device 1000 of fig. 22.

The terminal 1050 of fig. 22 receives the modulated signal transmitted by the 5 th device 1000. Note that, in terminal 1050 in fig. 22, the same reference numerals are given to components that operate in the same manner as terminal 150 in fig. 1 and terminal 450 in fig. 4.

The light receiving unit 151, such as an image sensor, e.g., CMOS or organic CMOS, included in the terminal 1050 receives the modulation signal transmitted from the 5 th device 1000. The receiving unit 153 receives the received signal 152 received by the light receiving unit 151 as an input, performs processing such as demodulation, error correction, and decoding of the received signal, and outputs received data 154.

The data analysis unit 155 receives the reception data 154 as input, and outputs, for example, SSID information 1051 of the base stations (470-1, 470-2, 470-3) as connection destinations and encryption key information 1052 for communicating with the base stations (470-1, 470-2, 470-3) as connection destinations from the reception data. For example, in a wireless lan (local Area network), there are wep (wired Equivalent privacy), WPA (Wi-Fi Protected Access), WPA2 (Wi-Fi Protected Access2) (PSK (Pre-red Key) mode, and eap (extended authentication protocol) mode) as encryption schemes. In addition, the encryption method is not limited thereto.

The display unit 157 receives SSID information 1051 and encryption key information 1052, and displays, for example, an SSID and an encryption key of a communication partner to which the wireless device 453 provided in the terminal is to access (this display is named "1 st display in the present embodiment").

For example, after the display of fig. 1, the wireless device 453 provided in the terminal 1050 in fig. 10 receives SSID information 1051 and encryption key information 1052, and establishes a connection (for example, if the connection uses radio waves) with any one of the base stations (or APs) 470-1, 470-2, and 470-3. At this time, when the connected base station also communicates with the wireless device 453 included in the terminal 1050 in fig. 22, the modulated signal is transmitted using radio waves, for example.

Then, the wireless device 453 provided in the terminal 1050 in fig. 22 receives the data 1053 and the control signal 1054 as input, modulates the data 1053 under the control of the control signal 154, and transmits the modulated signal as a radio wave.

For example, the connected base station (or AP) transmits data to the network (any one of 471-1, 471-2, and 471-3), and receives data from the network (any one of 472-1, 472-2, and 472-3). Then, for example, it is assumed that the connected base station transmits the modulated signal as an electric wave to terminal 1050 in fig. 22.

The wireless device 453 included in the terminal 1050 in fig. 22 demodulates a modulated signal received as radio waves, performs error correction decoding and other processes, and acquires received data 1056. The display unit 157 displays based on the received data 1056.

The terminal 1050 of fig. 22 receives the modulated signal transmitted by the 5 th device 1000. Note that, in terminal 1050 in fig. 22, the same reference numerals are given to components that operate in the same manner as terminal 150 in fig. 1 and terminal 450 in fig. 4.

The light receiving unit 151, such as an image sensor, e.g., CMOS or organic CMOS, included in the terminal 1050 receives the modulation signal transmitted from the 5 th device 1000. The receiving unit 153 receives the received signal 152 received by the light receiving unit 151 as an input, performs processing such as demodulation, error correction, and decoding of the received signal, and outputs received data 154.

The data analysis unit 155 receives the reception data 154 as input, and outputs, for example, SSID information 1051 of the base stations (470-1, 470-2, 470-3) as connection destinations and encryption key information 1052 for communicating with the base stations (470-1, 470-2, 470-3) as connection destinations from the reception data. For example, in a wireless lan (local Area network), there are wep (wired Equivalent privacy), WPA (Wi-Fi Protected Access), WPA2 (Wi-Fi Protected Access2) (PSK (Pre-Key) mode), eap (extended authentication protocol) mode) and encryption schemes. In addition, the encryption method is not limited thereto.

The display unit 157 receives SSID information 1051 and encryption key information 1052, and displays, for example, an SSID and an encryption key of a communication partner to which the wireless device 453 provided in the terminal is to access (this display is named "1 st display in the present embodiment").

For example, after the display of fig. 1, the wireless device 453 provided in the terminal 1050 in fig. 10 receives SSID information 1051 and encryption key information 1052, and establishes a connection (for example, if the connection uses radio waves) with any one of the base stations (or APs) 470-1, 470-2, and 470-3. At this time, the connected base station also transmits the modulated signal using radio waves, for example, when communicating with the wireless device 453 included in the terminal 1050 in fig. 22.

Then, the wireless device 453 provided in the terminal 1050 in fig. 22 receives the data 1053 and the control signal 1054 as input, modulates the data 1053 in accordance with the control of the control signal 154, and transmits the modulated signal as a radio wave.

For example, the connected base station (or AP) transmits data to the network (any one of 471-1, 471-2, and 471-3), and receives data from the network (any one of 472-1, 472-2, and 472-3). Then, for example, it is assumed that the connected base station transmits the modulated signal as an electric wave to terminal 1050 in fig. 22.

The wireless device 453 included in the terminal 1050 in fig. 22 performs processing such as demodulation and error correction decoding on a modulated signal received as radio waves, and acquires received data 1056. The display unit 157 displays based on the received data 1056.

As a modulated signal transmitted by the 5 th device 1000 of fig. 22, it is assumed that there are 3 frame structures in the case of fig. 22. Fig. 23 is 2300-1 frame #1 as one of 3 frame structures, fig. 24 is 2300-2 frame structure #2 as one of 3 frame structures, and fig. 25 is 2300-3 frame structure #3 as one of 3 frame structures.

Fig. 23 shows an example of the structure of 2300-1 frame #1 of the modulated signal transmitted by the 5 th device 1000 of fig. 22. In fig. 23, the horizontal axis represents time, and the same symbols as those in fig. 2 and 11 are assigned the same reference numerals, and description thereof is omitted. The 2300-1 frame #1 of fig. 23 is a frame for transmitting information of the SSID of the 470-1 base station #1 of fig. 22 and information of the encryption key of the 470-1 base station #1 of fig. 22 (encryption key for access to the 470-1 base station # 1).

Symbol 2301-1 regarding the SSID in fig. 23 is a symbol for transmitting information 1001-1 regarding the SSID in fig. 22. Also, symbol 2301-1 in fig. 23 regarding the SSID is a symbol for the 5 th device 1000 of fig. 22 to transmit the SSID of 470-1 base station #1 of fig. 22.

A symbol 2302-1 of fig. 23 regarding an encryption key is a symbol for transmitting the information 1001-2 of fig. 22 regarding an encryption key. And, a symbol 2302-1 of fig. 23 regarding an encryption key is a symbol for the 5 th apparatus 1000 of fig. 22 to transmit the encryption key of the 470-1 base station #1 of fig. 22 (the encryption key for access to the 470-1 base station # 1).

The 5 th device transmits a preamble 201, a control information symbol 202, a symbol 2301-1 regarding an SSID, a symbol 2302-1 regarding an encryption key, and a data symbol 1102. Further, the 5 th device 1000 in fig. 22 may transmit 2300-1 frame #1 including symbols other than those shown in fig. 23. The structure of 2300-1 frame #1 is not limited to that of fig. 23, including the order of transmitting symbols.

Fig. 24 shows an example of the structure of 2300-2 frame #2 of the modulated signal transmitted by the 5 th device 1000 of fig. 22. In fig. 24, the horizontal axis represents time, and the same symbols as those in fig. 2 and 11 are assigned the same reference numerals, and description thereof is omitted. The 2300-2 frame #2 of fig. 24 is a frame for transmitting information of the SSID of the 470-2 base station #2 of fig. 22 and information of the encryption key of the 470-2 base station #2 of fig. 22 (encryption key for access to the 470-2 base station # 2).

Symbol 2301-2 concerning the SSID in fig. 24 is a symbol for transmitting information 1001-1 concerning the SSID in fig. 22. Also, the SSID related symbol 2301-2 in fig. 24 is a symbol for the 5 th device 1000 of fig. 22 to transmit the SSID of 470-2 base station #2 of fig. 22.

A symbol 2302-2 of fig. 24 regarding an encryption key is a symbol for transmitting the information 1001-2 of fig. 22 regarding an encryption key. Also, a symbol 2302-2 of fig. 24 regarding an encryption key is a symbol used for the 5 th apparatus 1000 of fig. 22 to transmit the encryption key of 470-2 base station #2 of fig. 22 (encryption key for access to 470-2 base station # 2).

The 5 th device transmits a preamble 201, a control information symbol 202, symbols 2301-2 relating to the SSID, symbols 2302-2 relating to the encryption key, and data symbols 1102. Further, the 5 th device 1000 in fig. 22 may transmit 2300-2 frame #2 including symbols other than those shown in fig. 24. The structure of 2300-2 frame #2 including the order of transmitting symbols is not limited to that of fig. 24.

Fig. 25 shows an example of the structure of 2300-3 frame #3 of the modulated signal transmitted by the 5 th device 1000 of fig. 22. In fig. 25, the horizontal axis represents time, and the same symbols as those in fig. 2 and 11 are assigned the same reference numerals, and description thereof is omitted. The 2300-3 frame #3 of fig. 25 is a frame for transmitting information of the SSID of the 470-3 base station #3 of fig. 22 and information of the encryption key of the 470-3 base station #3 of fig. 22 (encryption key for access to the 470-3 base station # 3).

Fig. 25 shows an example of the structure of 2300-3 frame #3 of the modulated signal transmitted by the 5 th device 1000 of fig. 22. In fig. 25, the horizontal axis represents time, and the same symbols as those in fig. 2 and 11 are assigned the same reference numerals, and description thereof is omitted. The 2300-3 frame #3 of fig. 25 is a frame for transmitting information of the SSID of the 470-3 base station #3 of fig. 22 and information of the encryption key of the 470-3 base station #3 of fig. 22 (encryption key for access to the 470-3 base station # 3).

The SSID related symbol 2301-3 in fig. 25 is a symbol for transmitting SSID related information 1001-1 in fig. 22. Also, the SSID related symbols 2301-3 in fig. 25 are symbols for the 5 th device 1000 of fig. 22 to transmit the SSID of 470-3 base station #3 of fig. 22.

A symbol 2302-3 of fig. 25 on an encryption key is a symbol for transmitting the information 1001-2 of fig. 22 on an encryption key. Also, a symbol 2302-3 of fig. 25 regarding an encryption key is a symbol for the 5 th apparatus 1000 of fig. 22 to transmit the encryption key of the 470-3 base station #3 of fig. 22 (the encryption key for access to the 470-3 base station # 3).

The 5 th device transmits a preamble 201, a control information symbol 202, symbols 2301-3 related to the SSID, symbols 2302-3 related to the encryption key, and a data symbol 1102. Further, the 5 th device 1000 in fig. 22 may transmit 2300-3 frame #3 including symbols other than those shown in fig. 25. The structure of 2300-3 frame #3 is not limited to the structure of fig. 25, including the order in which the symbols are transmitted.

Fig. 26 shows an example of a transmission method when the 5 th device in fig. 22 transmits "frame #1 of 2300-1 in fig. 23", "frame #2 of 2300-2 in fig. 24", and "frame #3 of 2300-3 in fig. 25", and the horizontal axis in fig. 26 represents time.

In fig. 26, in "frame #1 group transmission" 2601-1 and 2601-2, 1 or more frames #1 of 2300-1 of fig. 23 are transmitted. Further, in the "frame #2 group transmission" 2602-1 and 2602-2, 1 or more frames #2 of 2300-2 of fig. 24 are transmitted. In the "frame #3 group transmission" 2603-1 and 2603-2, 1 or more frames #3 of 2300-3 of fig. 25 are transmitted.

The detailed description of this case is as follows.

It is described that "in 'frame #1 group transmission' 2601-1 and 2601-2, 1 or more frames #1 of 2300-1 of fig. 23 are transmitted. ", this point will be explained.

For example, when an image sensor such as a CMOS or an organic CMOS is used in the light receiving unit 151, there is a possibility that the received signal is processed in units of frames of a moving image or a still image. For example, in a moving image, the description "4K 30 p" means that the number of pixels of 1 frame is 3840 × 2160, and the number of frames of 1 second is 30.

Therefore, if the 5 th device in fig. 22 transmits a modulated signal having a structure in which "frame #1 of 2300-1 in fig. 23", "frame #2 of 2300-2 in fig. 24", and "frame #3 of 2300-3 in fig. 25" exist in 1 frame, it is difficult for the terminal 1000 in fig. 22 to select a base station to be accessed from a plurality of base stations.

Therefore, a frame structure as shown in fig. 26 is proposed.

(method 1-1)

As the 1 st-1 st method, there are a plurality of 2300-1 frames #1 of fig. 23 in the "frame #1 group transmission" 2601-1 and 2601-2, and thus the time period occupied by the "frame #1 group transmission" is made longer than the frame length of a moving image or a still image.

In this way, since terminal 1050 in fig. 22 can be prevented from receiving modulated signals such as "2300-1 frame #1 in fig. 23", "2300-2 frame #2 in fig. 24", and "2300-3 frame #3 in fig. 25" in 1 frame of a moving image or a still image from 5 th device 1000, terminal 1050 in fig. 22 can easily select a base station to be accessed from a plurality of base stations.

(method of 2-1)

As the method of the 2 nd-1 st method, the time interval occupied by the 2300 th-1 st frame #1 of fig. 23 is made longer than the frame length of the moving image or the still image. For example, the following structure is possible: in a symbol 2301-1 relating to the SSID in fig. 23, a plurality of pieces of "information on the SSID of the base station # 1" (information on the SSID of the base station #1 is repeatedly included), and a plurality of pieces of "information on the encryption key of the base station #1 (information on the encryption key used for connection with the base station # 1)" are included in a symbol 2302-1 relating to the encryption key (information on the encryption key used for connection with the base station #1 "is repeatedly included).

In this way, since terminal 1050 in fig. 22 can be prevented from receiving modulated signals such as "2300-1 frame #1 in fig. 23", "2300-2 frame #2 in fig. 24", and "2300-3 frame #3 in fig. 25" in 1 frame of a moving image or a still image from 5 th device 1000, terminal 1050 in fig. 22 can easily select a base station to be accessed from a plurality of base stations.

If considered as such, the "frame #2 group transmission" 2602-1, 2602-2 may be in the following such structure.

(methods 1 to 2)

As the 1 st to 2 nd method, there are a plurality of 2300-2 frames #2 of fig. 24 in the "frame #2 group transmission" 2602-1, 2602-2, and thereby the time interval occupied by the "frame #2 group transmission" is made longer than the frame length of the moving image or the still image.

(method of 2-2)

As the method of the 2 nd-2 nd, the time section occupied by the 2300-2 frame #2 of fig. 24 is made longer than the frame length of the moving image or the still image. For example, the following structure is possible: in a symbol 2301-2 relating to the SSID in fig. 24, a plurality of pieces of "information on the SSID of the base station # 2" (information on the SSID of the base station #2 is repeatedly included), and a plurality of pieces of "information on the encryption key of the base station #2 (information on the encryption key used for connection with the base station # 2)" are included in a symbol 2302-2 relating to the encryption key (information on the encryption key used for connection with the base station #2 is repeatedly included).

If considered as such, the "frame #3 group transmission" 2603-1, 2603-2 may be in the following such structure.

(methods of 1 to 3)

As the method of 1 to 3, there are a plurality of 2300-3 frames #3 of fig. 25 in the "frame #3 group transmission" 2603-1, 2603-2, and thus the time period occupied by the "frame #3 group transmission" is made longer than the frame length of the moving image or the still image.

(methods of 2 to 3)

As the method of the 2 nd to the 3 rd, the time interval occupied by the 2300-3 frame #3 of fig. 25 is made longer than the frame length of the moving image or the still image. For example, the following structure is possible: in the symbol 2301-3 relating to the SSID in fig. 25, a plurality of pieces of "information on the SSID of the base station # 3" (information on the SSID of the base station #3 is repeatedly included), and a plurality of pieces of "information on the encryption key of the base station #3 (information on the encryption key used for connection with the base station # 3)" are included in the symbol 2302-3 relating to the encryption key (information on the encryption key used for connection with the base station #3 is repeatedly included).

Next, an effect in the case where the 5 th device 1000 in fig. 22 transmits a frame as in fig. 23 to 26 will be described.

Consider the area 2700 in fig. 27, assume that the 5 th device 1000 in fig. 22 is configured in ○ 2701-1, 2701-2, 2701-3, 2701-4, 2701-5, 2701-6, 2701-7, 2701-8, 2701-9, 2701-10, and that 470-1 base station #1 of fig. 22 is configured in ◎ 2702-1, 470-2 base station #2 of fig. 22 is configured in ◎ 2702-2, and 470-3 base station #3 of fig. 22 is configured in ◎ 2702-3.

Further, for example, it is assumed that 99 terminals having the configuration of 1050 in fig. 22 exist in the region inside 2703.

At this time, for example, it is assumed that the 5 th apparatuses 2701 to 5 and 2701 to 10 both transmit information of the SSID of the 470-3 base station #3 and further transmit information of the encryption key used for access of the 470-3 base station #3 (since the nearest base station of the 5 th apparatuses 2701 to 5 and 2701 to 10 is the 470-3 base station # 3).

Therefore, it is highly likely that the terminal 99 having the configuration of 1050 in fig. 22 accesses base station 470-3 #3 in fig. 22 and is difficult to access the terminal having the configuration of 1050 in fig. 22 in base station 470-3 #3 in fig. 22.

If this is taken into account, then: as described above, 99 terminals having the configuration of 1050 in fig. 22 can access the control of 470-1 base station #1 (2702-1) in fig. 22, 470-2 base station #2 (2702-2) in fig. 22, and 470-3 base station #3 (2702-3) as uniformly as possible, thereby reducing the number of terminals that are difficult to access to the base station.

When the 5 th device 1000 in fig. 22 transmits a frame as in fig. 23 to 26 in the present embodiment, the timing at which 99 terminals having the configuration of 1050 in fig. 22 access the 5 th device in fig. 22 is usually different, and therefore, the operation is "performed: 99 terminals having the configuration of 1050 in fig. 22 access to the controls of 470-1 base station #1 (2702-1), 470-2 base station #2 (2702-2) and 470-3 base station #3 (2702-3) in fig. 22 as uniformly as possible. Therefore, as described above, it is possible to obtain an effect of reducing the presence of terminals that are difficult to access to the base station.

Fig. 26 shows an example of the transmission method when the 5 th device in fig. 22 transmits "frame 2300-1 #1 in fig. 23", "frame 2300-2 #2 in fig. 24", and "frame 2300-3 #3 in fig. 25", but the transmission method when the 5 th device in fig. 22 transmits "frame 2300-1 #1 in fig. 23", "frame 2300-2 #2 in fig. 24", and "frame 2300-3 #3 in fig. 25" is not limited to this.

Fig. 26 shows an example of the transmission method when the 5 th device in fig. 22 transmits "frame 2300-1 #1 in fig. 23", "frame 2300-2 #2 in fig. 24", and "frame 2300-3 #3 in fig. 25", but the transmission method when the 5 th device in fig. 22 transmits "frame 2300-1 #1 in fig. 23", "frame 2300-2 #2 in fig. 24", and "frame 2300-3 #3 in fig. 25" is not limited to this.

For example, fig. 26 shows a configuration in which the transmission is repeated in the order of "frame #1 group transmission", "frame #2 group transmission", and "frame #3 group transmission", but the transmission of "frame #1 group transmission", "frame #2 group transmission", and "frame #3 group transmission" need not be in the order shown in fig. 26. For example, the "frame group 1 transmission", the "frame group #2 transmission", the "frame group #3 transmission" may be transmitted randomly in time, or the transmission order of the "frame group 1 transmission", the "frame group #2 transmission", and the "frame group #3 transmission" may be transmitted in a regular order different from that in fig. 26. At least the 5 th device in fig. 22 may transmit "frame #1 group transmission", "frame #2 group transmission", and "frame #3 group transmission".

In fig. 26, "frame #1 group transmission", "frame #2 group transmission", and "frame #3 group transmission" are continuously transmitted, but may not necessarily be continuously transmitted, and for example, in fig. 26, there may be a time interval between frame #1 group 2601-1 and frame #2 group transmission 2602-2.

In fig. 26, the transmission is configured only by "frame #1 group transmission", "frame #2 group transmission", and "frame #3 group transmission", but other symbols and other frames may be present. Further, although 3 base stations are shown in fig. 26 and 22, the number of base stations is not limited to this, and if 2 or more base stations are used, the same operation as that in the case of 3 base stations can be performed. Therefore, for example, when there are N base stations (N is an integer of 2 or more), there is "frame # k group transmission" when transmission as shown in fig. 26 is performed. Further, k is an integer of 1 to N. The "frame # k group transmission" includes a symbol related to the SSID (SSID information of the base station # k) and a symbol related to the encryption key (encryption key information used for access of the base station # k).

Fig. 12 shows an example of a frame configuration of a modulated signal transmitted by wireless device 453 included in terminal 1050 in fig. 22. In fig. 12, the horizontal axis represents time. As shown in fig. 12, for example, a radio device 453 provided in the terminal 1050 in fig. 22 transmits a preamble 1201, and then transmits a control information symbol 1202 and an information symbol 1203.

In this case, preamble 1201 is a symbol used by base stations (or APs) 470-1, 470-2, and 470-3 for receiving a modulated signal transmitted from wireless device 453 of terminal 1050 in fig. 22, for example, to perform signal detection, time synchronization, frame synchronization, frequency offset estimation, and the like.

The control information symbol 1202 contains data such as a method of error correction coding used when generating a modulated signal, information on a modulation method, information on a frame structure, and information on a transmission method, and the base stations (or APs) 470-1, 470-2, and 470-3 demodulate the modulated signal based on the information contained in the control information symbol 1202.

Information symbol 1203 is a symbol used for wireless apparatus 453 of terminal 1050 of fig. 22 to transmit data.

Wireless device 453 of terminal 1050 in fig. 22 may transmit a frame including symbols other than the symbols shown in fig. 12 (e.g., a frame including pilot symbols (reference symbols) in the middle of information symbols). Further, the frame structure including the order of transmitting symbols is not limited to the structure of fig. 12. In fig. 12, a plurality of symbols may be present in the frequency axis direction, that is, a symbol may be present in a plurality of frequencies (a plurality of carriers).

Fig. 7 shows an example of a frame configuration of modulated signals transmitted by base stations 470-1, 470-2, and 470-3 in fig. 22. In fig. 7, the horizontal axis represents time. As shown in fig. 7, assume that the base stations 470-1, 470-2, 470-3 transmit, for example, a preamble 701, and then transmit control information symbols 702, information symbols 703.

In this case, it is assumed that the preamble 701 is a symbol used by the radio apparatus 453 of the terminal 1050 in fig. 22 for receiving the modulated signal transmitted by the base stations 470-1, 470-2, and 470-3, for example, for signal detection, time synchronization, frame synchronization, frequency offset estimation, and the like.

Control information symbol 702 includes data such as a method of an error correction coding scheme used when generating a modulated signal, information on a modulation scheme, information on a frame structure, and information on a transmission method, and radio apparatus 453 of terminal 1050 in fig. 22 demodulates a modulated signal based on the information of the symbol.

The information symbol 703 is a symbol used for the base station (or AP) 470-1, 470-2, 470-3 of fig. 22 to transmit data.

The base stations (or APs) 470-1, 470-2, and 470-3 in fig. 22 may transmit frames including symbols other than the symbols shown in fig. 7 (e.g., frames including pilot symbols (reference symbols) in the middle of information symbols). Further, the frame structure including the order of transmitting symbols is not limited to the structure of fig. 7. In fig. 7, a plurality of symbols may be present in the frequency axis direction, that is, a symbol may be present in a plurality of frequencies (a plurality of carriers).

Fig. 28 is a flowchart showing an example of processing performed by the "5 th device 1000", "terminal 1050", and "base station # X (or AP # X)" in fig. 22. In addition, X is 1, 2 or 3.

First, the 5 th device 1000 of fig. 22 transmits a modulated signal of the frame structure of fig. 26 as in 2801 of fig. 28.

Then, as in 2802 in fig. 28, terminal 1050 in fig. 22 receives the modulated signal transmitted from device 5 in fig. 22, and selects a base station to which terminal 1050 will access from base stations 470-1, 470-2, and 470-3 in fig. 22, respectively.

This point will be explained. The terminal 1050 in fig. 22 performs access with a base station and receives a modulated signal transmitted from the 5 th device 1000 in fig. 22. In this case, for example, in any 1 frame of a moving image or a still image, any one of "frame #1 group transmission", "frame #2 group transmission", and "frame #3 group transmission" in fig. 26 is obtained. Then, from the obtained information (for example, SSID) of the base station, the terminal 1050 in fig. 22 determines the base station to which the terminal 1050 should access as any one of 470-1 base station #1, 470-2 base station #2, and 470-3 base station #3 in fig. 22.

As shown in 2803 in fig. 28, upon receiving the modulated signal transmitted from the 5 th device 1000 in fig. 22, the terminal 1050 in fig. 22 acquires the SSID of the base station # X to which the terminal 1050 is to access.

Meanwhile, as in 2804 of fig. 28, the terminal 1050 of fig. 22 acquires an encryption key used in communication with the base station # X to which the terminal accesses.

Terminal 1050 in fig. 22 performs radio wave connection with base station # X (2805).

In response to the response from base station # X, terminal 1050 in fig. 22 completes the connection with base station # X as in 2806 in fig. 28.

As indicated by 1307 in fig. 28, terminal 1050 in fig. 22 transmits information of a connection destination to base station # X using radio waves.

Then, as in 2808 in fig. 28, base station # X obtains information for transmission to terminal 1050 in fig. 22 from the network.

Then, as in 2809 in fig. 28, base station # X transmits the obtained information to terminal 1050 in fig. 22 using radio waves, and terminal 1050 in fig. 22 obtains the information.

Terminal 1050 in fig. 22 acquires necessary information from the network via base station # X, for example, as necessary.

As described above, the terminal connects to the base station (or AP) and acquires information based on the SSID information and the encryption key information transmitted from the 5 th device, thereby obtaining an effect of being able to securely acquire information via the base station (or AP) whose security is guaranteed. This is because, when information is obtained from a modulated signal of visible light, the user can easily determine whether or not the information source is safe since the user uses the visible light.

For example, when the SSID is obtained from a modulated signal of a radio wave transmitted from a wireless LAN, it is difficult for a user to identify a device that has transmitted the radio wave. Therefore, it is more preferable to acquire the SSID by visible light communication in order to secure the security of information.

In addition, although the case where the 5 th device transmits the information of the encryption key has been described in the present embodiment, for example, in the case where the base station (or AP) does not perform encrypted communication using the encryption key, the 5 th device can similarly be implemented by transmitting only the information on the SSID without transmitting the information of the encryption key, and by simply removing the structure on the encryption key.

The configuration of the 5 th device is not limited to the configuration shown in fig. 22, and the configuration of the terminal is not limited to the configuration shown in fig. 22, and the connection destinations and configuration methods of the base stations #1, #2, and #3 are not limited to fig. 22.

In addition, in the case of implementation as in the present embodiment, when a plurality of terminals exist in a certain area, it is possible to obtain an effect that the existence of terminals that are difficult to access to the base station can be reduced.

In fig. 27, the frame structures of the modulated signals transmitted by the 5 th devices ○ 2701-1, 2701-2, 2701-3, 2701-4, 2701-5, 2701-6, 2701-7, 2701-8, 2701-9, and 2701-10 may all be the same as in fig. 26, or the frame structures of the modulated signals transmitted by the 5 th device may be different, or there may be a plurality of 5 th devices that transmit modulated signals of the same frame structure.

(embodiment mode 8)

According to the embodiments described so far, the transmitting device that includes the light source and the illumination and transmits the light modulation signal may be configured to obtain data transmitted using the light modulation signal from an external device such as a server and update the transmission data every time the data is obtained. This is because, in this way, it is possible to obtain an effect that data desired by the user or the device can be updated in sequence.

An example of the above-described communication system will be described below.

Fig. 29 shows an example of the configuration of the apparatus related to the transmission of the optical modulation signal according to the present embodiment. The device related to the transmission of the optical modulation signal is composed of a communication device 2900 for plc (power line communication) and a communication device 2950 for transmitting the optical modulation signal.

Modulation unit 2903 in PLC communication device 2900 receives data 2901 and control signal 2902 as input, performs error correction coding based on information on the error correction coding method (error correction code, coding rate, code length (block length), etc.) and modulation scheme included in control signal 2902, maps the set modulation scheme, and generates and outputs modulation signal 2904.

In addition, it is assumed that data 2901 includes "data transmitted by the optical modulation signal transmitted by device 2950".

The transmission unit 2905 receives the modulated signal 2904 as an input, performs signal processing, generates a transmission signal 2906, and outputs the transmission signal. The transmitter 2905 may perform signal processing related to the OFDM (Orthogonal Frequency Division Multiplexing) scheme, generate and output a transmission signal 2906 based on the OFDM scheme. The transmission unit 2905 may perform signal processing related to the wavelet OFDM (wavelet OFDM) scheme, generate and output a transmission signal 2906 based on the wavelet OFDM scheme. Here, although the transmission signal of the multi-carrier system of OFDM or wavelet OFDM is described, the present invention is not limited to this, and may be a transmission signal of a single-carrier system or a spread spectrum communication system. Further, non-patent documents 2 and 3 are related to the wavelet OFDM scheme.

The PLC communication device 2900 is characterized by "the transmission signal is a signal having a frequency spectrum from DC (Direct Current) to N Hz". In addition, N is a real number larger than 0. Here, the transmission signal does not necessarily have a spectrum in all frequencies from DC (Direct Current) to N Hz. Therefore, the transmission unit 2905 may not include a frequency conversion unit (rf (radio frequency) unit).

The transmission signal 2006 is input to the communication device 2950 as a reception signal 2908 via the power line. In addition, the power line containing the transmit signal 2006 provides power to the device 2950. Demodulation unit 2953 receives received signal 2908 as input, performs decoding processing such as demapping and error correction decoding, and outputs received data 2954.

The storage unit 2955 receives the reception data 2954 as an input, and stores the reception data 2954 or a part of the reception data 2954 when it is determined that the reception data 2954 is the update data. The transmission unit 2957 receives the stored data 2956 as input.

Further, the storage unit 2955 may determine that the received data 2954 is the update data by the control signal 2990.

The transmission unit 2957 receives the stored data 2956 as input, performs processing such as modulation, generates a transmission signal 2958, and outputs the transmission signal. At this time, frequency conversion is not performed (therefore, the transmission signal 2958 becomes a signal having a spectrum from DC to P [ Hz ] (P is a real number larger than 0)).

The AC-DC converter 2951 receives the reception signal 2980 as an input, converts the reception signal 2980 present on the AC into a signal on the DC, and outputs a converted signal 2952.

Signal selection unit 2960 receives transmission signal 2958, conversion signal 2952, and control signal 2959 as input, selects one of transmission signal 2958 and conversion signal 2952 based on control signal 2959, and outputs selected signal 2961. Also, a selection signal 2961 is sent from the light source 2962.

When signal selection unit 2960 selects converted signal 2952 as selection signal 2961, selection signal 2961 may include a signal other than converted signal 2952.

As described above, the following effects can be obtained: data desired by the user or the device can be obtained by selectively switching and transmitting the transmission signal 2958 and the conversion signal 2952, and data desired by the user or the device can be more flexibly obtained by transmitting information required for emergency, burst, or demand using the conversion signal 2952, for example. Further, the following effects can be obtained: by AC-DC converting the modulated signal generated for PLC and transmitting it as an optical modulated signal, the modulated signal for PLC can be relayed on a small circuit scale (since the modulated signal for PLC has a spectrum as described above), and thus desired data can be transmitted to a larger number of users and devices.

Fig. 30 is an example of the configuration of an apparatus related to transmission of an optical modulation signal according to the present embodiment, which is different from fig. 29. In fig. 30, the same reference numerals are given to portions that operate similarly to fig. 29, and the description thereof is omitted.

The transmission device 3003 receives data 3001 and external data 3002 as input data, performs processing such as error correction coding and modulation, generates and outputs a transmission signal 3004. It is assumed that the external data 3002 includes, for example, instruction information for updating data stored in the storage unit 2955. That is, it is assumed that communication device 2950 transmits a request for updating data stored in storage unit 2955 to communication device 2900.

The transmission signal 3004 is input to the communication apparatus 2900 as a reception signal 3006 via the transmission channel 3005.

The reception device 3007 receives the reception signal 3006 as input, performs processing such as demapping and error correction decoding, and outputs reception data 3008.

Modulation unit 2903 determines whether or not to transmit the update data in storage unit 2955 based on the information "request for data update in storage unit 2955 by communication device 2950" included in received data 3008.

By operating as described above, the same effects as those described in the description of fig. 29 can be obtained in the communication system of fig. 30.

An example of the operation of the AC-DC converter 2951 will be described below.

AC-DC converter 2951 separates, from received signal 2980, an AC power component having an AC power frequency of, for example, 50Hz or 60Hz, and a signal component having a frequency higher than the AC power frequency. The separation of the ac power supply component from the signal component can be performed using, for example, a frequency filter such as a high-pass filter, a low-pass filter, or a band-pass filter, or a combination thereof.

The AC-DC converter 2951 performs AC-DC conversion of the separated AC power supply component into a DC power supply component, and generates a DC power supply component. The AC-DC converter 2951 superimposes the separated signal component on the DC power supply component to generate a converted signal 2952. Here, the process of superimposing the signal component on the dc power supply component is performed by, for example, coupling the signal component to a power line supplying the dc power supply component via a coupling transformer or the like.

Note that the dc power supply component to which the signal component is superimposed need not be obtained by converting an ac power supply component into a dc power supply component, and the signal component may be superimposed on a dc power supply component generated by another configuration, not shown, included in the communication device 2950. The conversion signal 2952 may be a signal containing a signal component that does not include a dc power supply component.

The AC-DC converter 2951 may perform processing such as amplification using an amplifier on the separated signal component. With this configuration, since the intensity (or amplitude) of the signal component included in the optical modulation signal transmitted from the light source 2962 can be controlled, it is possible to improve the reception quality of the optical modulation signal.

In the explanation using fig. 29 and fig. 30, the case where the PLC communication device 2900 superimposes a PLC signal on the power line 2907 that supplies an ac power supply is described as an example, but the PLC communication device 2900 may superimpose a PLC signal on the power line 2907 that supplies a dc power supply. According to this configuration, even if the communication device 2950 does not include an AC-DC converter, the direct-current power supply in which the signal component, that is, the PLC signal, is superimposed can be supplied as the converted signal 2952 to the signal selection unit 2960 and the light source 2962, and therefore, the configuration of the communication device 2950 can be simplified.

In the above description, the PLC transmission signal has a spectrum from DC (Direct Current) to N Hz, but may not have a spectrum in all frequencies. An example of the PLC transmission signal as described above will be described below.

For example, the PLC signal may be a signal called a low-speed PLC which communicates using a frequency from 10kHz to 450kHz, or a signal called a high-speed PLC which communicates using a frequency from 2MHz to 30MHz or from 2MHz to 80 MHz. In addition, a part of the frequency band used for communication may be output with power smaller than that of other frequencies, or a notch frequency band may be provided as a frequency band not used for communication. When transmitting a PLC signal having a notch band as an optical modulation signal, an intensity-modulated optical signal is transmitted using a modulation signal in which the components of the notch band are suppressed. As a method of setting a notch band to a PLC transmission signal, a method of suppressing a signal component in the notch band using a frequency filter such as a band-elimination filter, a method of generating a modulated signal using a subcarrier not using a notch band by using a Wavelet-OFDM multicarrier method having a deep filtering characteristic, or the like can be used.

In the above description, the PLC communication using the lamp line as the transmission line is described as an example, but a coaxial cable, a twisted pair cable, a cable other than the lamp line such as a telephone line, or the like may be used as the transmission line.

(embodiment mode 9)

In this embodiment, an example of the configurations of the transmitting apparatus and the receiving apparatus described in this specification will be described. The transmission device of the present embodiment is characterized in that a plurality of modulated optical signals are transmitted.

Fig. 31 shows an example of the configuration of a transmitting apparatus and a receiving apparatus according to the present embodiment. In fig. 31, a transmitting apparatus 3100 transmits a plurality of optical modulation signals, and a receiving apparatus 3150 receives the plurality of optical modulation signals to obtain received data.

It is assumed that the transmitting apparatus in fig. 31 transmits M modulated optical signals. In addition, it is assumed that M is an integer of 2 or more.

The transmission unit 3102_ i receives data 3101_ i and a control signal 3105 as input, performs error correction coding and signal processing based on the transmission method based on information about the error correction coding method and information about the transmission method included in the control signal 3105, generates and outputs an optical modulation signal 3103_ i. In addition, i is an integer of 1 to M.

Also, a light modulation signal 3103_ i is transmitted from the light source 3104_ i.

The light receiving unit 3151 such as an image sensor receives light corresponding to the light modulation signal 3103 — i. At this time, the light receiving unit 3151 receives light corresponding to the M optical modulation signals.

The light receiving unit 3151 outputs a light receiving signal 3152_ i corresponding to the optical modulation signal 3103_ i. In addition, i is an integer of 1 to M.

The reception unit 3153_ i receives the light reception signal 3152_ i corresponding to the optical modulation signal 3103_ i as an input, performs processing such as demodulation and error correction decoding, and outputs reception data 3154_ i corresponding to the data 3101_ i.

The data acquisition unit 3155 receives data 3154_1, data 3154_2, and …, and data 3154_ M as inputs, generates data 3156, and outputs the data.

Fig. 32 shows a configuration example of a transmitting device and a receiving device according to the present embodiment, which is different from fig. 31. In fig. 32, the same reference numerals are given to portions that operate similarly to fig. 31.

Assignment unit 3202 receives information 3201 and control signal 3105 as input, and performs error correction coding on the information based on the information about the error correction coding method included in control signal 3105 to generate error correction coded data. The distribution unit 3202 distributes the error correction encoded data and outputs the error correction encoded data a2001_ i.

In addition, how the assignment to the M error correction coded data 3101 — i is performed may be performed. For example, the error correction coded data may be divided into M pieces, and the divided M pieces of data series may be assigned to the error correction coded data 3101 — i, respectively. Further, M data sequences composed of the same data may be generated from the error-correction-encoded data, and each data sequence may be assigned to the error-correction-encoded data 3101 — i. The method of assigning to the error-correction-encoded data 3101_ i is not limited to these, and M data series may be generated from the error-correction-encoded data and each data series may be assigned to the error-correction-encoded data 3101_ i.

The transmission unit 3102_ i receives data 3101_ i and a control signal 3105 as input, performs signal processing based on the transmission method based on information about the transmission method included in the control signal 3105, generates an optical modulation signal 3103_ i, and outputs the signal. In addition, i is an integer of 1 or more and M or less.

Also, a light modulation signal 3103_ i is transmitted from the light source 3104_ i.

The light receiving unit 3151 of the image sensor or the like receives light corresponding to the light modulation signal 3103 — i. At this time, the light receiving unit 3151 receives light corresponding to the M optical modulation signals.

The light receiving unit 3151 outputs a light receiving signal 3152_ i corresponding to the optical modulation signal 3103_ i. In addition, i is an integer of 1 to M.

The reception unit 3153_ i receives the light reception signal 3152_ i corresponding to the optical modulation signal 3103_ i as an input, performs processing such as demodulation, and outputs (log likelihood ratio of) reception data 3154_ i corresponding to the data 3101_ i.

The error correction decoding unit 3251 receives (log likelihood ratio of) the received data 3154_1, (log likelihood ratio of) the received data 3154_2 and …, and (log likelihood ratio of) the received data 3154_ M as input, performs error correction decoding, and outputs received data 3252.

The above-described transmission device and reception device can be similarly implemented in the embodiments of the present specification, and the effects described in the embodiments can be similarly obtained.

(embodiment mode 10)

In this embodiment, a configuration of an apparatus related to transmission of an optical modulation signal, which is different from the apparatus related to transmission of an optical modulation signal described in embodiment 8 of fig. 29 and 30, will be described.

Fig. 33 is an example of the configuration of an apparatus related to transmission of an optical modulation signal, which is different from fig. 29 and 30, and in fig. 33, the same reference numerals are given to portions which operate in the same manner as in fig. 29, and description thereof is omitted.

The characteristic point of fig. 33 is that the communication device 2900 transmits an optical modulation signal.

The light source transmission unit 3301 receives the modulation signal 2904 as an input, performs signal processing for the light source, generates an optical modulation signal 3302, and outputs the optical modulation signal. Then, the light modulation signal 3302 is irradiated as light from the light source 3303.

Receiving apparatus 3305 receives received signal 3304 corresponding to the optical modulation signal, and performs processing such as demodulation and error correction decoding to obtain received data.

As described above, the effects described in embodiment 8 can be obtained, and more communication apparatuses can obtain information by transmitting the optical modulation signal from the communication apparatus 2900.

Fig. 34 is an example of the configuration of a device related to an optical modulation signal, which is different from fig. 29, 30, and 33, and in fig. 34, the same reference numerals are given to the same portions as those in fig. 29 and 33, and the description thereof is omitted.

Fig. 34 differs from fig. 33 in that the transmission unit 2905 generates the optical modulation signal 3401. Therefore, the transmission unit 2905 receives the modulated signal 2904 as an input, generates and outputs a transmission signal 2906 for PLC and a transmission signal 3401 for optical communication (visible light communication). In addition, both the transmission signal 2906 for PLC and the transmission signal 3401 for optical communication (visible light communication) are signals having a spectrum from DC to N [ Hz ] (N is a real number greater than 0). However, the spectrum does not necessarily exist in all frequencies from DC to N [ Hz ]. Also, a transmission signal 3401 for optical communication (visible light communication) is irradiated as light from the light source 3303.

As described above, the effects described in embodiment 8 can be obtained, and more communication apparatuses can obtain information by transmitting the optical modulation signal from the communication apparatus 2900.

Fig. 35 is an example of the configuration of a transmitting apparatus associated with an optical modulation signal, which is different from fig. 29, 30, and 33, and in fig. 35, the same reference numerals are given to the same portions as those in fig. 29, 30, and 33, and the description thereof is omitted. Therefore, the description of each part in fig. 35 is omitted because it is already described.

As described above, the effects described in embodiment 8 can be obtained, and more communication apparatuses can obtain information by transmitting the optical modulation signal from the communication apparatus 2900.

Fig. 36A is an example of the configuration of a transmitting apparatus relating to an optical modulation signal, which is different from fig. 29, 30, 33, and 34, and in fig. 36A, the same reference numerals are given to portions that operate in the same manner as in fig. 29, 30, 33, and 34, and the description thereof is omitted. Therefore, the description of each part in fig. 36A is omitted because it is already described.

As described above, the effects described in embodiment 8 can be obtained, and more communication apparatuses can obtain information by transmitting the optical modulation signal from the communication apparatus 2900.

(supplement 2)

Further, at least one of the fpga (field Programmable Gate array) and the cpu (central processing unit) may be configured to download all or a part of software necessary for realizing the communication method described in the present invention by wireless communication or wired communication. Further, the software update apparatus may be configured to be capable of downloading all or a part of the software for update by wireless communication or wired communication. Further, the digital signal processing described in the present invention may be executed by storing the downloaded software in the storage unit and operating at least one of the FPGA and the CPU based on the stored software.

In this case, a device including at least one of the FPGA and the CPU may be connected to the communication modem wirelessly or by wire, and the communication method described in the present invention may be implemented by the device and the communication modem.

For example, a communication device such as a base station, an AP, or a terminal described in this specification may include at least one of an FPGA and a CPU, and the communication device may include an interface for obtaining software for operating at least one of the FPGA and the CPU from the outside. Further, the communication device may include a storage unit for storing software obtained from the outside, and the signal processing described in the present invention may be realized by operating the FPGA or the CPU based on the stored software.

The 1 st "car or vehicle" may be provided with the transmission device described in this specification, and the 2 nd "car or vehicle" may be provided with the reception device described in this specification, so as to transmit and receive data.

The "transmitting device or a part of the function of the transmitting device" described in this specification may be connected to the 1 st "vehicle or vehicle" via an interface, and the "receiving device or a part of the receiving device" described in this specification may be connected to the 2 nd "vehicle or vehicle" via an interface, to transmit data by transmission and reception.

Note that the 1 st "vehicle or vehicle" may include the transmission device described in this specification, and the transmission device and the reception device described in this specification may transmit and receive data.

The 2 nd "vehicle or vehicle" may be provided with the receiving device described in the present specification, and the receiving device and the transmitting device described in the present specification may transmit and receive data.

Further, the "transmission device or a part of the function of the transmission device" described in the present specification may be connected to the 1 st "vehicle or transportation means via an interface, and the series of transmission devices and the reception device described in the present specification may transmit and receive data.

The "receiving device or a part of the receiving device" described in this specification may be connected to the "2 nd" vehicle or vehicle "via an interface, and the transmitting device and the series of receiving devices described in this specification may transmit and receive data.

In the case where the "vehicle or vehicle" includes the transmission device or a part of the transmission device described in the present specification or the "vehicle or vehicle" and the "transmission device described in the present specification or the" function of the "part of the transmission device described in the present specification" are connected via the interface ", the light source provided in the" vehicle or vehicle "may be used as the light source provided in the transmission device described in the present specification.

For example, as shown in fig. 36B, the vehicle B100 may include light sources B101_1, B101_2, B101_3, and B101_4, and 1 or more of these light sources may be used as light sources for transmitting the light modulation signal by the transmission device described in this specification.

The transmission device or the device connected to the transmission device may have a function of selecting "which light source is to be used as the light source for the transmission device described in this specification to transmit the light modulation signal" among the plurality of light sources mounted on the vehicle B100. Further, the brightness of the light source, the irradiation angle of the light source, and the position of the light source may be set together.

In the case where the "vehicle or vehicle" includes the receiver device or a part of the receiver device described in the present specification, "or the" vehicle or vehicle "and the" receiver device described in the present specification "or the" function of the part of the receiver device described in the present specification "are connected via the interface," a light receiving unit (for example, an image sensor, a photodiode, or the like) provided in the "vehicle or vehicle" may be used as the light receiving unit provided in the receiver device described in the present specification.

For example, as shown in fig. 36C, the vehicle B100 may include light receiving units B201_1, B201_2, B201_3, B201_4, B201_5, and B201_6, and 1 or more of these light receiving units may be used as light receiving units for receiving the light modulation signal by the receiving device described in this specification.

The receiving device or the device connected to the receiving device may have a function of selecting "which light receiving unit is to be used as the light receiving unit for receiving the light modulation signal by the receiving device described in this specification" among the plurality of light receiving units mounted in the vehicle B100. In addition, the angle of the light receiving unit and the position of the light receiving unit may be set together.

Further, the reception device described in the present specification may be configured to display data received by a front instrument panel mounted in a vehicle or a cabin mounted in a vehicle. Further, the reception of data by the reception device described in this specification may be notified to the user by vibrating the steering wheel itself such as a car or a vibrator provided in the steering wheel.

Further, the vehicle provided with the receiving device described in the present embodiment may be connected to the terminal via an interface, and the data obtained by the receiving device may be stored in a storage unit provided in the terminal. The vehicle may also include a storage unit, and the vehicle may store the reception data. In addition, both the storage unit provided in the terminal and the storage unit provided in the vehicle may store the reception data.

In the present specification, the server may provide an application related to processing associated with the receiving apparatus, and the terminal may implement the function of the receiving apparatus described in the present specification by installing the application. Further, the application may be provided to the terminal by connecting a communication device provided with the transmission device described in this specification to a server via a network, or the application may be provided to the terminal by connecting another communication device having a transmission function to the server via a network.

Similarly, in the present specification, the server may provide an application related to processing associated with the transmission device, and the communication device may implement the function of the transmission device described in the present specification by installing the application. Further, the application may be provided to another communication device by connecting the communication device to the server via the network.

The server may provide software related to the light source provided in the transmitting device and the light receiving unit provided in the receiving device, and by obtaining the software, the light source provided in the transmitting device may support transmission of the optical modulation signal and the light receiving unit provided in the receiving device may support reception of the optical modulation signal.

Further, the transmitting device in the present specification may have a function of a server, or an application provided in the transmitting device may be provided to the communication device by using some communication means, and the communication device may realize the receiving device in the present specification by the application obtained by downloading.

In addition, although the present specification describes "an illumination unit" and "a light source", a method may be employed in which a display or a projector that displays an image, a moving image, an advertisement, or the like emits light and the light modulation signal is included in the light. That is, the "illumination unit" and the "light source" may have functions other than the function of emitting light. The "illumination unit" and the "light source" may be constituted by a plurality of "illuminations" and "light sources".

Further, a transmission method used in a communication device that generates an optical modulation signal and emits light may be a method other than the transmission method described in this specification. The optical modulation signal may contain information other than the information described in this specification.

Further, the illumination/light source itself such as an LED may have the function of the transmitting device described in this specification.

Further, the device for generating the transmission light modulation signal may not include the illumination or the light source, and the device for generating the transmission light modulation signal may be connected to the illumination or the light source via an interface.

The communication method between the transmitting apparatus and the receiving apparatus described in the present embodiment may be the communication method shown in fig. 36D. Next, fig. 36D will be described.

A symbol mapping unit receives transmission data as input, performs mapping based on a modulation scheme, and outputs a symbol sequence (ci).

The equalization preprocessing unit receives the symbol sequence as input, performs equalization preprocessing on the symbol sequence in order to reduce equalization processing on the receiving side, and outputs the symbol sequence after the equalization preprocessing.

A Hermite (Hermite) symmetry processing unit receives the symbol sequence after equalization preprocessing as an input, allocates subcarriers to the symbol sequence after equalization preprocessing so that Hermite symmetry can be ensured, and outputs a parallel signal.

The inverse (fast) fourier transform unit receives the parallel signal as an input, applies inverse (fast) fourier transform to the parallel signal, and outputs an inverse (fast) fourier transformed signal.

The parallel-serial and cyclic prefix adding unit receives the signal after the inverse (high-speed) fourier transform, adds a parallel-serial transform and a cyclic prefix, and outputs the signal after signal processing.

The digital-analog converter receives the signal after the signal processing as an input, performs digital-analog conversion, and outputs an analog signal, and the analog signal is output as light from 1 or more LEDs, for example.

Further, the equalization preprocessor and the hermitian symmetry processor may not be provided. That is, the signal processing in the equalization preprocessing section and the hermitian symmetry processing section may not be performed.

The photodiode receives light as input, and obtains a reception signal through a TIA (Transimpedance Amplifier).

The analog-to-digital conversion unit performs analog-to-digital conversion on the received signal and outputs a digital signal.

The cyclic prefix removing and serial-parallel converting unit receives the digital signal as input, removes the cyclic prefix, and then performs serial-parallel conversion to receive the parallel signal as input.

The (high-speed) Fourier transform unit receives the parallel signal as an input, performs (high-speed) Fourier transform, and outputs a signal after the (high-speed) Fourier transform.

The detection section receives the signal after the Fourier transform as an input, performs detection, and outputs a received symbol sequence.

A symbol demapping unit receives the received symbol sequence as input, and performs demapping to obtain a received data sequence.

As described above, even if the transmitting apparatus that transmits the optical modulation signal and the receiving apparatus that receives the optical modulation signal are applied to the embodiments in the present specification, the embodiments can be similarly implemented.

The communication method of the transmitting apparatus and the receiving apparatus according to the present embodiment may be a communication method described below.

< line scan sampling >

A smart phone, a digital camera, or the like is mounted with an image sensor such as a cmos (complementary Metal oxide semiconductor) sensor. The image captured by the CMOS sensor is not captured of a landscape at exactly the same time as a whole, but the amount of light received by the sensor is read out for each line by, for example, a rolling shutter method in which the shutter operation is performed for each line. Therefore, the time required for reading is estimated, and the start and end of light reception are controlled for each line with a time difference therebetween. That is, the image taken by the CMOS sensor is in the form of a stack of many rows each having a slight time slot over the exposure period.

The CMOS sensor is a system that focuses on the properties of the CMOS sensor, and achieves high-speed reception of visible light signals.

That is, in example 1 of the visible light communication system, by utilizing the property that the exposure time slightly differs for each line, as shown in fig. 36E, the luminance and color of the light source at a plurality of points in time can be measured for each line from 1 image (captured image of the image sensor), and a signal modulated at a higher speed than the frame rate can be captured.

This sampling method is referred to as "line scan sampling", and 1 column of pixels exposed at the same timing is referred to as "exposure line".

Although "line scan sampling" can be realized by a rolling shutter method using a CMOS sensor, the "line scan sampling" can be similarly realized by a rolling shutter method using a sensor other than the CMOS sensor, for example, a CCD (Charge-Coupled Device) sensor, an organic (CMOS) sensor, or the like.

However, in the shooting setting at the time of shooting in the camera function (shooting function of a moving image or a still image), even if a light source that flickers at a high speed is shot, the flickers do not appear as a stripe pattern along the exposure line. This is because, in this setting, the exposure time is sufficiently longer than the flicker period of the light source, and therefore, as shown in fig. 36F, the change in luminance due to the flicker (light emission pattern) of the light source is uniformly averaged, and the change in pixel value between the exposure lines becomes small, resulting in a substantially uniform image.

On the other hand, as shown in fig. 36G, by setting the exposure time to be equal to or less than the blinking period of the light source, the state of blinking of the light source (light emission pattern) can be observed as a change in the luminance of the exposure line.

For example, the exposure line is designed to be parallel to the long side direction of the image sensor. In this case, for example, if the frame rate is 30fps (frames per second), 32400 or more samples per second can be obtained at a resolution of 1920 × 1080 size, and 64800 or more samples per second can be obtained at a resolution of 3840 × 2160 size.

< application example of line scan sampling >

In the above description, the line scan sampling in which the signal indicating the amount of received light is read out for each line has been described, but the sampling method using the optical signal of the image sensor such as the CMOS is not limited to this. As a sampling method used for receiving an optical signal, various methods are available which can obtain a signal sampled at a higher sampling rate than the frame rate used for capturing a normal moving image. For example, a system in which the exposure period is controlled for each pixel by a global shutter system having a shutter function for each pixel to read out a signal, or a system in which the exposure period is controlled for each group of a plurality of pixels arranged in a shape other than a row to read out a signal may be employed. Further, a method of reading out signals from the same pixel a plurality of times in a period corresponding to 1 frame at a frame rate used for capturing a normal moving image may be employed.

< frame-based sampling >

Further, the optical signal may be sampled in a frame rate system having a shutter function for each non-pixel, even in a system of increasing the frame rate.

The present description can be implemented in any of the above-described "line scan sampling", "application example of line scan sampling", and "frame-based sampling".

< light source and modulation method >

In the visible light communication, for example, an led (light Emitting diode) can be used as the transmitter. LEDs are becoming popular as backlight sources for lighting and displays, and can blink at high speed.

However, the light source used as the transmitter of the visible light communication is not freely blinked for the visible light communication. If a change in luminance due to visible light communication can be recognized by a person, the function of the original light source such as illumination is impaired. Therefore, it is required to illuminate the transmission signal with a desired brightness without flickering.

As a modulation scheme for responding to this request, there is a modulation scheme called 4PPM (4-Pulse position modulation), for example. 4PPM is a way of representing 2 bits by 4 combinations of light and dark of the light source, as shown in FIG. 36H. In 4PPM, as shown in fig. 36H, among 4 times, 3 times are bright states and 1 time is dark states, so that the average brightness (average brightness) is 3/4-75% regardless of the signal content.

For comparison, the manchester encoding method shown in fig. 36I is used as a similar method. The manchester coding scheme is a scheme in which 1 bit is expressed by 2 states, and the modulation efficiency is 50% as high as 4PPM, but the average luminance is 1/2-50% because 1 out of 2 times is a bright state and 1 time is a dark state. That is, as a modulation method of visible light communication, it can be said that 4PPM is more suitable than the manchester encoding method. However, even when a change in brightness due to visible light communication is recognized by a person, the communication performance does not deteriorate, and therefore, there is no problem in using a system in which a change in brightness recognized by a person occurs depending on the application. Therefore, the transmitter (light source) may generate a modulation signal by using a modulation method such as ask (Amplitude Shift keying), psk (phase Shift keying), or pam (pulse Amplitude modulation), and illuminate the light source.

The communication method between the transmitter and the receiver described in the present specification is not limited to the above example, and can be similarly implemented regardless of the radio communication method using any frequency such as light, visible light, infrared light, and ultraviolet light.

In this specification, although there are cases where "symbol" such as "symbol relating to location or position information", "symbol relating to time information", "symbol relating to SSID", "symbol relating to access destination", "symbol relating to encryption key" and the like is named "symbol", the embodiments can be similarly implemented even if the symbol is not called "symbol" but is called "data", "information", "field", "bit" or "field". In addition, terms other than "symbol", "data", "information", "field", "bit" and "region" may be used. The transmitting apparatus may transmit the data to the other communication party in any symbol structure such as "a symbol related to location or position information", "a symbol related to time information", "a symbol related to SSID", "a symbol related to access destination", "a symbol related to encryption key", and the like.

In the present specification, in a transmission device including "light source" and "illumination unit", the "light source" and the "illumination unit" may be constituted by a plurality of "light sources" and a plurality of "illuminations".

(embodiment A1)

In this embodiment, a method and a system for receiving an optical modulated signal will be described.

Fig. 37 shows a system including the communication device according to the present embodiment.

A communication apparatus (e.g., a terminal or the like) 3700 is an apparatus that receives an optical modulation signal. The light receiving unit 3702 receives the optical modulation signal 3701 as an input and outputs a reception signal 3704.

The storage section 3704 stores the received signal 3703 as an input. The storage section 3704 outputs the stored data as storage data 3705.

Transmitter 3707 receives data 3706 and memory data 3705 as input, performs processing such as error correction coding and modulation, and outputs modulated signal 3708.

A receiver 3701 of a communication device (e.g., a base station, an ap (access point), or the like) 3750 receives a modulation signal 3708 transmitted by the communication device 3700, that is, receives the modulation signal 3708 as input. The receiver 3701 performs processing such as demodulation and error correction decoding, and outputs received data 3752.

Received data 3752 is sent via network 3770 as data 3771 to server 3772.

The server 3772 receives the data 3771 as input, performs, for example, demodulation and error correction decoding of the modulated light signal 3701, obtains and outputs data 3773 included in the modulated light signal 3701.

The data 3773 is input as data 3753 to the transmitting device 3754 via the network 3770. The transmitter 3754 included in the communication device 3750 receives the data 3753 as input, performs processing such as error correction coding and modulation, and outputs a modulation signal 3755.

The reception device 3720 included in the communication device 3700 receives the modulated signal 3755 as an input, performs processing such as demodulation and error correction decoding, obtains reception data 3721, and outputs the reception data. At this time, the reception data 3721 is data included in the optical modulation signal 3701.

The operation of fig. 37 will be described with reference to fig. 38.

In fig. 38, "terminal" corresponds to the communication device 3700 of fig. 37, "base station" corresponds to the communication device 3750 of fig. 37, and "server" corresponds to the server 3772 of fig. 37.

First, a terminal accesses a server via a base station (3801). Then, the server confirms that the terminal has accessed (3802).

And, it is assumed that the terminal receives the optical modulation signal. Then, the terminal creates data on the optical modulation signal for transmission to the server. However, the data is not data contained in the optical modulation signal.

Therefore, the terminal transmits the "data on the optical modulation signal" to the server to the base station (3803).

The base station receives the "data related to the optical modulated signal" transmitted from the terminal (3804). And, the base station transmits the reception data to the server.

Then, the server obtains "data relating to the optical modulation signal" transmitted from the base station (3806). The server performs processing such as demodulation and error correction decoding of the optical modulation signal based on the data on the optical modulation signal, and obtains data included in the optical modulation signal (3807). The server transmits data included in the optical modulation signal, that is, data obtained by processing such as demodulation to the base station, and the base station transmits the data to the terminal (3808).

Thereby, the terminal obtains the reception data of the optical modulation signal.

As described above, the following effects can be obtained: a terminal having a communication function for connecting to a light receiving unit such as an image sensor and a server can obtain received data of an optical modulation signal without adding a new signal processing unit, that is, can obtain received data of an optical modulation signal while reducing the circuit scale and the operation scale of the terminal.

In the present embodiment, the description has been made by referring to a terminal, a base station, and a server, but the present invention is not limited to this, and a system may be configured by a device having a communication function. The optical modulation signal reception method described in this embodiment can be applied as the optical modulation signal reception method described in this specification.

(embodiment A2)

In this embodiment, a moving image providing method using an optical modulation signal will be described.

Fig. 39A shows a first example of a system related to the moving image providing method using an optical modulation signal according to the present embodiment.

As shown in fig. 39A, the system includes a communication system 3970 and a terminal 3980. The communication system 3970 includes a plurality of cameras 3971A, 3971B, …, and 3971N, a server 3972, and a plurality of transmission devices 3973A, 3973B, …, and 3973N.

The plurality of cameras 3971A and the like generate image data by shooting.

The server 3972 stores image data generated by the plurality of cameras 3971A and the like.

The plurality of transmission devices 3973A and the like are a plurality of transmission devices 3973A and the like that correspond to the plurality of cameras 3971A and the like one-to-one, and the plurality of transmission devices 3973A and the like transmit light that includes, as a visible light communication signal, information relating to communication for accessing a storage location in a server that stores image data generated by a camera corresponding to the transmission device.

For example, the information may include address information indicating a storage location where the image data is stored. The address information is, for example, a URL. The address information may be included in a frame of the optical modulation signal as a "symbol including access related information", for example.

For example, the information may include an encryption key used for encryption of communication in which the terminal accesses a storage location in which the image data is stored. The encryption key may be included in a frame of the optical modulated signal as a "symbol related to the encryption key", for example.

For example, the information may include an identifier of a base station used for wireless communication in which the terminal accesses a storage location in which the image data is stored. The identifier of the base station is, for example, an SSID. The identifier of the base station may be included in a frame of the optical modulation signal as "SSID-related symbol", for example.

For example, the information may include position information indicating a position of a place where the image data is captured. The location information is, for example, an identifier that can uniquely determine a seat of a stadium. The position information may be included in a frame of the optical modulation signal as a "symbol related to the position information", for example.

The terminal 3980 includes a receiving device 3981 and a transmitting/receiving device 3982.

The receiving device 3981 receives light including information indicating a storage location of image data as a visible light communication signal.

The transceiver 3982 receives image data from the storage location indicated by the information received by the receiver 3981.

Next, the processing of the above system will be described.

Fig. 39B is a flowchart showing an example of processing related to a moving image providing method using an optical modulation signal.

As shown in fig. 39B, in step S3971, image data is generated by image capturing performed by the plurality of cameras 3971A and the like.

In step S3972, the image data generated by each of the plurality of cameras 3971A and the like is stored in the server 3972.

Light including, as a visible light communication signal, information on communication for accessing a storage location in the server 3972 storing image data generated by a camera corresponding to the transmission device is transmitted by each of the plurality of transmission devices 3973A and the like.

In step S3981, light including information indicating a storage location of image data as a visible light communication signal is received.

In step S3982, image data is received from the storage location indicated by the received information.

This system will be described in more detail below.

Fig. 39C shows a second example of a system related to the moving image providing method using the optical modulation signal according to the present embodiment.

The system is constituted by a moving image providing system 3999 and terminals 3950_1, 3950_ 2. The moving image providing system 3999 corresponds to the communication system described above.

The 1 st camera 3902_1 communicates with the server 3905, the 1 st camera 3902_1 transmits a signal 3903_1 containing the 1 st photographing data to the server 3905, and the server 3905 transmits a signal containing the 1 st data to the 1 st camera 3902_ 1.

The 2 nd camera 3902_2 communicates with the server 3905, the 2 nd camera 3902_2 transmits a signal 3903_2 containing the 2 nd photographing data to the server 3905, and the server 3905 transmits a signal containing the 2 nd data to the 2 nd camera 3902_ 2.

The 3 rd camera 3902_3 communicates with the server 3905, the 3 rd camera 3902_3 transmits a signal 3903_3 containing the 3 rd photographing data to the server 3905, and the server 3905 transmits a signal containing the 3 rd data to the 3 rd camera 3902_ 3.

At this time, the server 3905 provides the moving image or the still image (corresponding to the 1 st shot data) shot by the 1 st camera 3902_1 to the accessed terminal or the like. Similarly, the server 3905 provides a moving image or a still image (corresponding to 2 nd shooting data) shot by the 2 nd camera 3902_2 to an accessed terminal or the like. The server 3905 also provides the moving image or the still image (corresponding to the 3 rd captured data) captured by the 3 rd camera 3902_3 to the accessed terminal or the like.

The 1 st transmitting device 3901_1 includes a transmitting device for transmitting (irradiating) a light modulation signal, and it is assumed that the transmitted light modulation signal includes information (e.g., url (uniform resource locator)) of an access destination of the server 3905 for obtaining "a moving image or a still image (corresponding to 1 st imaging data) captured by the 1 st camera 3902_ 1. Therefore, by receiving (receiving) the light modulation signal transmitted (irradiated) by the 1 st transmitting device 3901_1, the received terminal can obtain information on the access destination of the server 3905, and can obtain "a moving image or a still image (corresponding to the 1 st shot data) shot by the 1 st camera 3902_ 1".

The 2 nd transmitting device 3901_2 includes a transmitting device for transmitting (irradiating) an optical modulation signal, and it is assumed that the transmitted optical modulation signal includes information (e.g., a URL) of an access destination of the server 3905 for obtaining "a moving image or a still image (corresponding to 2 nd imaging data) captured by the 2 nd camera 3902_ 2". Therefore, by receiving (receiving) the light modulation signal transmitted (irradiated) by the 2 nd transmitting device 3901_2, the received terminal can obtain information on the access destination of the server 3905, and can obtain "a moving image or a still image (corresponding to the 2 nd shot data) shot by the 2 nd camera 3902_ 2".

The 3 rd transmission device 3901_3 includes a transmission device for transmitting (irradiating) an optical modulation signal, and it is assumed that the transmitted optical modulation signal includes information (e.g., a URL) of an access destination of the server 3905 for obtaining "a moving image or a still image (corresponding to 3 rd captured data) captured by the 3 rd camera 3902_ 3". Therefore, by receiving (receiving) the light modulation signal transmitted (irradiated) by the 3 rd transmitting device 3901_3, the received terminal can obtain information on the access destination of the server 3905, and can obtain "a moving image or a still image (corresponding to the 3 rd shot data) shot by the 3 rd camera 3902_ 3".

The moving image may include sound and audio.

The 1 st communication device 3911_1 is a device that communicates with the terminal 3950_1, the terminal 3950_2, or the like. The server 3905 inputs a signal 3906_1(3909_1) containing data as an output to the 1 st communication device 3911_1 via the network 3908_ 1. The 1 st communication device 3911_1 transmits a modulated signal 3912_1 containing the data.

On the other hand, the 1 st communication device 3911_1 receives the received signal 3913_1 from the terminal, performs signal processing such as demodulation to obtain received data, and outputs a signal 3910_1 including the data. The signal 3910_1(3907_1) is input to the server 3905 via a network.

The 2 nd communication device 3911_2 is a device that communicates with the terminal 3950_1, the terminal 3950_2, or the like. The server 3905 inputs a signal 3906_2(3909_2) containing data as an output to the 2 nd communication device 3911_2 via the network 3908_ 2. Also, the 2 nd communication device 3911_2 transmits a modulated signal 3912_2 containing the data.

On the other hand, the 2 nd communication device 3911_2 receives the received signal 3913_2 from the terminal, performs signal processing such as demodulation to obtain received data, and outputs a signal 3910_2 including the data. The signal 3910_2(3907_2) is input to the server 3905 via a network.

The terminal 3950_1 includes a "receiving device 3951_1 for receiving and demodulating an optical modulation signal" and a "transmitting/receiving device 3954_1 for communicating with the 1 st communication device 3911_1 and the 2 nd communication device 3911_ 2".

The receiving device 3951_1 receives the optical modulation signal 3952_1 (transmitted by the 1 st transmitting device 3901_1, the 2 nd transmitting device 3901_2, or the 3 rd transmitting device 3901_ 3), demodulates the optical modulation signal 3952_1, performs error correction decoding, and the like, obtains and outputs received data 3953_ 1.

The transceiver 3954_1 receives data 3955_1 and (received) data 3953_1, and performs signal processing such as error correction coding and modulation to generate and output a modulated signal 3957_ 1.

On the other hand, the transceiver 3954_1 receives the reception signal 3958_1 of the modulated signal transmitted by the 1 st communication device 3911_1, the 2 nd communication device 3911_2, and the like, performs processing such as demodulation and error correction decoding, obtains reception data 3956_1, and outputs the reception data.

Similarly, the terminal 3950_2 includes a "receiving device 3951_2 for modulating an optical signal and demodulating the optical signal" and a "transmitting/receiving device 3954_2 for communicating with the 1 st communication device 3911_1 and the 2 nd communication device 3911_ 2".

The receiving device 3951_2 receives the optical modulation signal 3952_2 (transmitted by the 1 st transmitting device 3901_1, the 2 nd transmitting device 3901_2, or the 3 rd transmitting device 3901_ 3), demodulates the optical modulation signal 3952_2, performs error correction decoding, and the like, obtains received data 3953_2, and outputs the received data.

The transceiver 3954_2 receives the data 3955_2 and (received) data 3953_2, performs signal processing such as error correction coding and modulation, generates a modulated signal 3957_2, and outputs the modulated signal.

On the other hand, the transceiver 3954_2 receives the reception signal 3958_2 of the modulated signal transmitted by the 1 st communication device 3911_1, the 2 nd communication device 3911_2, and the like, performs processing such as demodulation and error correction decoding, obtains reception data 3956_2, and outputs the reception data.

Next, the operation of the moving image providing method and system using the optical modulation signal of fig. 39C will be described with reference to fig. 40, 41, and 42.

Fig. 40 shows an example of a scene of a stadium, for example. Suppose a soccer game is played in the field 4001. Further, it is assumed that a score scene occurs in the region 4002. In fig. 40, the same reference numerals are given to the devices corresponding to fig. 39C.

It is assumed that the 1 st camera 3902_1, the 2 nd camera 3902_2, the 3 rd camera 3902_3, and the 4 th camera 3902_4 are provided to capture moving images or still images of a game situation of a field, a situation of a viewer, and the like. Operations related to the 1 st camera 3902_1, the 2 nd camera 3902_2, the 3 rd camera 3902_3, and the 4 th camera 3902_4 have been described with reference to fig. 39C, and therefore, the description thereof is omitted.

The 1 st transmitting apparatus 3901_1, the 2 nd transmitting apparatus 3901_2, the 3 rd transmitting apparatus 3901_3, and the 4 th transmitting apparatus 3901_4 are provided together with the 1 st camera 3902_1, the 2 nd camera 3902_2, the 3 rd camera 3902_3, and the 4 th camera 3902_ 4. Operations related to the 1 st transmitting apparatus 3901_1, the 2 nd transmitting apparatus 3901_2, the 3 rd transmitting apparatus 3901_3, and the 4 th transmitting apparatus 3901_4 have been described with reference to fig. 39C, and therefore, the description thereof is omitted. At this time, the 1 st transmitting apparatus 3901_1 may be disposed in the vicinity of the 1 st camera 3902_1, the 2 nd transmitting apparatus 3901_2 may be disposed in the vicinity of the 2 nd camera 3902_2, the 3 rd transmitting apparatus 3901_3 may be disposed in the vicinity of the 3 rd camera 3902_3, and the 4 th transmitting apparatus 3901_4 may be disposed in the vicinity of the 4 th camera 3902_ 4. The 1 st transmitting device 3901_1, the 2 nd transmitting device 3901_2, the 3 rd transmitting device 3901_3, and the 4 th transmitting device 3901_4 may also include illumination for irradiating light to a field of a stadium.

In fig. 40, the 1 st terminal 3950_1 and the user using the 1 st terminal 3950_1 are in the positions shown in fig. 40, and there is a high possibility that the score scene occurring in the area 4002 is not seen. Accordingly, it is assumed that the user using the 1 st terminal 3950_1 has a demand to view a moving image or a still image captured by the 3 rd camera 3902_3, which is a camera closer to the area 4002 where the score scene occurs.

Therefore, it is assumed that the user performs an operation of directing the light receiving unit of the receiving device 3951 of the 1 st terminal 3950_1 toward the 3 rd camera 3902_ 3. Thereby, the 1 st terminal 3905_1 receives the light modulation signal transmitted (irradiated) by the 3 rd transmission device 3901_3 located in the vicinity of the 3 rd camera 3902_ 3.

With this operation as a starting point, the 1 st terminal 3905_1 obtains information on a moving image or a still image captured by the 3 rd camera 3902_3, and the detailed operation thereof will be described with reference to fig. 41 and 42.

Fig. 41 shows an example of the flow of operations of the kth camera 3902_ k, the kth transmitting apparatus 3901_ k, and the server 3905. In the scenario shown in fig. 40, k is 1, 2, 3, or 4. However, the number of cameras and transmission devices is not limited to 4.

Note that, in fig. 39C and 40, although a case where 1 device is used as an example to transmit an optical modulation signal including information (for example, URL or the like) of an access destination of the server 3905 for obtaining "a moving image or a still image (corresponding to k-th captured data) captured by the k-th camera 3902_ k" is described, a plurality of devices may be used to transmit an optical modulation signal including information (for example, URL or the like) of an access destination of the server 3905 for obtaining "a moving image or a still image (corresponding to k-th captured data) captured by the k-th camera 3902_ k", and the present invention can be similarly implemented even if a plurality of devices are present.

As shown in fig. 41, it is assumed that the k-th camera 3902_ k performs shooting of a moving image or a still image (4101).

Next, the k-th camera 3902_ k transmits the captured data to the server 3905. Then, the kth camera 3902_ k transmits information of an access destination for viewing a moving image or a still image on the server to the kth transmission apparatus 3901_ k (4102).

Then, the kth transmission apparatus 3901 — k obtains information of an access destination for viewing a moving image or a still image held by the server. Then, the kth transmission device 3901 — k transmits (irradiates) an optical modulation signal (4103) including the information.

Further, the server 3905 stores and distributes the shooting data transmitted by the k-th camera 3902_ k (4104).

In the example of fig. 41, the "kth camera 3902_ k transmits information on an access destination for viewing a moving image or a still image on the server to the kth transmitting apparatus 3901_ k", but the kth transmitting apparatus 3901_ k may hold "information on an access destination for viewing a moving image or a still image on the server" in advance without this operation. As another method, the operation of "the kth camera 3902_ k transmits information on an access destination for viewing a moving image or a still image on a server to the kth transmitting apparatus 3901_ k" is not limited to the timing shown in fig. 41, and may be any timing.

Fig. 42 shows an example of the operation flow of the 1 st terminal 3950_1, the 3 rd transmitting device 3902_3, and the 1 st communication device 3911_1 when the 1 st terminal 3950_1 is to obtain information on a moving image or a still image captured by the 3 rd camera 3902_3 in the state of fig. 40.

As shown in fig. 42, the 3 rd transmitting apparatus 3901_3 obtains information of an access destination for viewing "a moving image or a still image captured by the 3 rd camera 3902_ 3" in the server 3905. The 3 rd transmission device 3901_3 transmits (irradiates) an optical modulation signal (4201) including the information.

Since the user of the 1 st terminal 3950_1 wants to view a moving image or a still image captured from the vicinity of the 3 rd camera 3902_3, the 1 st terminal 3950_1 tries to receive (receive light) an optical modulation signal irradiated from the vicinity of the 3 rd camera 3902_3, that is, an optical modulation signal transmitted by the 3 rd transmitting device 3901_3, and receives the optical modulation signal (4202).

Then, the 1 st terminal 3950_1 obtains information of an access destination for obtaining a moving image or a still image photographed by the 3 rd camera 3902_3 by receiving the light modulation signal transmitted by the 3 rd transmitting device 3901_3, so the 1 st terminal 3950_1 requests an access to the server 3905 through the 1 st communication device 3911_1 by the transceiving device 3954_1 (4203).

The 1 st communication device 3911_1 receives the modulated signal 3957_1 transmitted from the transceiver 3954_1 included in the 1 st terminal 3950_ 1. Then, the 1 st communication device 3911_1 recognizes that the 1 st terminal 3950_1 requests data of a moving image or a still image captured by the 3 rd camera 3902_3, accesses the server 3905, and obtains information of the "moving image or still image captured by the 3 rd camera 3902_ 3" (4204).

Also, the 1 st communication device 3911_1 transmits a modulation signal 3912_1(4205) containing information of "moving image or still image captured by the 3 rd camera 3902_ 3".

Then, the 1 st terminal 3950_1 receives the modulated signal 3912_1 transmitted from the 1 st communication device 3911_1, and obtains information of "moving image or still image captured by the 3 rd camera 3902_ 3" (4206).

In the description of the scene of fig. 40, an example is described in which 1 "1 st terminal 3950_ 1" is present as a terminal, but the present invention is not limited to this, and a plurality of terminals may access information of a moving image or a still image captured by the 3 rd camera 3902_3, for example.

In addition, in fig. 39C, an example in which 2 communication apparatuses, that is, the 1 st communication apparatus 3911_1 and the 2 nd communication apparatus 3911_2, exist as communication apparatuses for accessing the server 3950 is described, but the present invention is not limited to this, and "1 communication apparatus may exist", and "2 or more communication apparatuses may exist".

As described above, the user using the terminal can easily obtain a desired effect of moving image or still image data.

Next, an example of a frame configuration of a modulated signal transmitted by each device in fig. 39C is described.

Fig. 43 shows an example of a frame structure of the optical modulation signal transmitted by the 1 st transmission device 3901_1, the 2 nd transmission device 3901_2, and the 3 rd transmission device 3901_3 in fig. 39C, and the horizontal axis represents time. For example, it is assumed that the kth transmission apparatus 3901_ k transmits a preamble 4301, a symbol including access-related information of moving image or still image data captured by the kth camera, and a data symbol 4303 in this order.

It is assumed that the preamble 4301 includes a symbol for synchronization of time or the like by the receiving apparatus of the communication partner, a symbol for signal detection by the receiving apparatus of the communication partner, and a symbol of control information (for example, information of a communication scheme, information of a modulation scheme, and information on an error correction code) necessary for the receiving apparatus of the communication partner to demodulate each symbol.

The symbol 4302 containing access association information of moving image or still image data captured by the kth camera is a symbol for notifying the receiving apparatus as a communication partner of information on an access destination of the moving image or still image data captured by the kth camera.

The data symbol 4303 is a symbol used for the 1 st transmission device 3901_1, the 2 nd transmission device 3901_2, and the 3 rd transmission device 3901_3 to transmit data to the 1 st terminal 3950_1, the 2 nd terminal 3950_2, and the like.

In fig. 43, symbols may be present in the frequency axis direction, i.e., the carrier direction. Therefore, a modulated signal of a multicarrier system such as ofdm (orthogonal Frequency Division multiplexing) may be used, and symbols other than the symbols shown in fig. 43 may be included in a frame. The order of transmitting symbols is not limited to fig. 43.

Fig. 44 shows an example of a frame configuration of the optical modulation signals transmitted by the 1 st transmission device 3901_1, the 2 nd transmission device 3901_2, and the 3 rd transmission device 3901_3 in fig. 39C, which is different from that in fig. 43, and the horizontal axis represents time. In fig. 44, the same reference numerals are given to the same portions that operate in the same manner as in fig. 43, and the description thereof is omitted.

Fig. 44 is different from fig. 43 in that a symbol 4401 of the SSID concerned is included in the frame. That is, the 1 st transmitting device 3901_1, the 2 nd transmitting device 3901_2, and the 3 rd transmitting device 3901_3 notify the terminals of SSIDs of, for example, wireless LANs that the terminals such as the 1 st terminal 3950_1 and the 2 nd terminal 3950_2 can access. This enables the terminal to easily and safely perform connection to the wireless LAN. The details of the access method to a wireless LAN or the like using symbol 4401 related to the SSID have already been described in embodiments 1 to 7, and therefore the description thereof is omitted.

Thus, terminals such as the 1 st terminal 3950_1 and the 2 nd terminal 3950_2 can access data of a moving image or a still image captured by the 1 st camera 3902_1, data of a moving image or a still image captured by the 2 nd camera 3902_2, and data of a moving image or a still image captured by the 3 rd camera 3902_3 via an access point such as a wireless LAN.

In this case, the 1 st communication device 3911_1 and the 2 nd communication device 3911_2 in fig. 39C become access points of a wireless LAN, for example. In fig. 44, symbols may be present in the frequency direction, i.e., the carrier direction. Therefore, a modulated signal of a multicarrier system such as OFDM may be used, and symbols other than those shown in fig. 44 may be included in a frame. The order of transmitting symbols is not limited to fig. 44.

Fig. 45 shows an example of a frame configuration of the optical modulation signal transmitted by the 1 st transmission device 3901_1, the 2 nd transmission device 3901_2, and the 3 rd transmission device 3901_3 in fig. 39C, which is different from that in fig. 43 and fig. 44, and the horizontal axis represents time. In fig. 45, the same reference numerals are given to the same parts that operate in the same manner as in fig. 43 and 44, and the description thereof is omitted.

Fig. 45 differs from fig. 43 and 44 in that a symbol 4501 relating to an encryption key is included in a frame. That is, the 1 st transmitting device 3901_1, the 2 nd transmitting device 3901_2, and the 3 rd transmitting device 3901_3 notify the terminals of, for example, the SSID of the wireless LAN and the encryption key of the wireless LAN that the terminals such as the 1 st terminal 3950_1 and the 2 nd terminal 3950_2 can access. This enables the terminal to easily and safely perform connection to the wireless LAN. Further, the details of the method of access to a wireless LAN or the like using symbol 4401 relating to the SSID and symbol 4501 relating to the encryption key have already been described in embodiments 1 to 7, and therefore, the description thereof is omitted.

Thus, terminals such as the 1 st terminal 3950_1 and the 2 nd terminal 3950_2 can access data of a moving image or a still image captured by the 1 st camera 3902_1, data of a moving image or a still image captured by the 2 nd camera 3902_2, and data of a moving image or a still image captured by the 3 rd camera 3902_3 via an access point such as a wireless LAN.

In this case, the 1 st communication device 3911_1 and the 2 nd communication device 3911_2 in fig. 39C become access points of a wireless LAN, for example. In fig. 45, symbols may be present in the frequency direction, i.e., the carrier direction. Therefore, a modulated signal of a multicarrier system such as OFDM may be used, and symbols other than those shown in fig. 45 may be included in a frame. The order of transmitting symbols is not limited to fig. 45.

Fig. 46 shows an example of a frame configuration of the optical modulation signal transmitted by the 1 st transmission device 3901_1, the 2 nd transmission device 3901_2, and the 3 rd transmission device 3901_3 in fig. 39C, which is different from that in fig. 43, 44, and 45, and the horizontal axis represents time. In fig. 46, the same reference numerals are given to the same parts that operate in the same manner as in fig. 43 and 45, and the description thereof is omitted.

The feature point in fig. 46 is that a symbol 4501 including an encryption key is included in a frame without including a symbol relating to an SSID. In this case, any of the following 2 methods may be employed.

(method 1)

There are "a transmission device that transmits a frame including a symbol 4401 relating to the SSID as shown in fig. 44" and "a transmission device that transmits a frame including a symbol 4501 relating to the encryption key as shown in fig. 46", respectively. The terminal receives the optical modulation signals of the two transmission devices and can access to a communication device such as a wireless LAN.

The terminal can access data of a moving image or a still image captured by the 1 st camera 3902_1, data of a moving image or a still image captured by the 2 nd camera 3902_2, and data of a moving image or a still image captured by the 3 rd camera 3902_3 via a communication device such as a wireless LAN.

In any one of the frame structures of fig. 44 and 46, the symbol 4302 including the access related information of the moving image or still image data captured by the kth camera may not be included.

Thus, terminals such as the 1 st terminal 3950_1 and the 2 nd terminal 3950_2 can access data of a moving image or a still image captured by the 1 st camera 3902_1, data of a moving image or a still image captured by the 2 nd camera 3902_2, and data of a moving image or a still image captured by the 3 rd camera 3902_3 via an access point such as a wireless LAN.

In this case, the 1 st communication device 3911_1 and the 2 nd communication device 3911_2 in fig. 39C become access points of a wireless LAN, for example. In fig. 46, symbols may be present in the frequency direction, i.e., the carrier direction. Therefore, a modulated signal of a multicarrier system such as OFDM may be used, and symbols other than those shown in fig. 46 may be included in a frame. The order of transmitting symbols is not limited to fig. 46.

(method 2)

Consider a state in which a terminal can obtain information of an access point of a wireless LAN or the like. In this case, it is assumed that the terminal receives the optical modulation signal having the frame structure of fig. 46 to obtain a symbol 4501 related to the encryption key. This enables the terminal to connect to an access point such as a wireless LAN. Therefore, terminals such as the 1 st terminal 3950_1 and the 2 nd terminal 3950_2 can access data of a moving image or a still image captured by the 1 st camera 3902_1, data of a moving image or a still image captured by the 2 nd camera 3902_2, and data of a moving image or a still image captured by the 3 rd camera 3902_3 via an access point of a wireless LAN or the like.

In this case, the 1 st communication device 3911_1 and the 2 nd communication device 3911_2 in fig. 39C become access points of a wireless LAN, for example. In fig. 46, symbols may be present in the frequency direction, i.e., the carrier direction. Therefore, a modulated signal of a multicarrier system such as OFDM may be used, and symbols other than those shown in fig. 46 may be included in a frame.

By performing as described above, the following effects can be obtained: in order to obtain a moving image or a still image captured at a position desired by a user, the terminal can obtain the moving image or the still image captured at the position desired by the user by a simple operation of the user directing the terminal in a direction toward the position desired by the user.

(embodiment A3)

In this embodiment, a frame structure of the optical modulation signal transmitted by the 1 st transmission device 3901_1, the 2 nd transmission device 3901_2, and the 3 rd transmission device 3901_3 in fig. 39C described in embodiment a2, which is different from that in fig. 43 to 46, will be described.

Fig. 47 shows an example of a frame structure of the optical modulation signal transmitted by the 1 st transmission device 3901_1, the 2 nd transmission device 3901_2, and the 3 rd transmission device 3901_3 in fig. 39C, and the horizontal axis represents time. The frame structure of fig. 47 includes a symbol 4701 including position information in addition to the symbols constituting the frame of fig. 43. For example, in the case where the 1 st transmitting apparatus 3901_1 in fig. 39C transmits the frame structure in fig. 47, it is assumed that the symbol 4701 including the position information includes information in the vicinity of the position where the 1 st transmitting apparatus 3901_1 or the 1 st camera 3902_1 is located. For example, the information may be information of a seat in a stadium.

In this way, the following effects can be obtained: the terminal can obtain information on the position where the moving image or still image to be obtained is captured, and the terminal can determine whether the information is information on a desired moving image or still image.

Further, the following effects can be obtained: in a stadium or the like, the terminal obtains the symbol 4701 including the position information included in fig. 47, whereby the user using the terminal can easily find the seat.

In fig. 47, symbols may be present in the frequency axis direction, i.e., the carrier direction. Therefore, a modulated signal of a multicarrier system such as OFDM may be used, and symbols other than the symbols shown in fig. 47 may be included in a frame. The order of transmitting symbols is not limited to fig. 47.

Fig. 48 shows an example of a frame structure of the optical modulation signal transmitted by the 1 st transmission device 3901_1, the 2 nd transmission device 3901_2, and the 3 rd transmission device 3901_3 in fig. 39C, and the horizontal axis represents time. The frame structure of fig. 48 may include a symbol 4701 including position information in addition to the symbols constituting the frame of fig. 44. For example, in the case where the 1 st transmitting apparatus 3901_1 in fig. 39C transmits the frame structure in fig. 48, it is assumed that the symbol 4701 including the position information includes information in the vicinity of the position where the 1 st transmitting apparatus 3901_1 or the 1 st camera 3902_1 is located. For example, the information may be information of a seat in a stadium.

In this way, the following effects can be obtained: the terminal can obtain information on the position where the moving image or still image to be obtained is captured, and the terminal can determine whether the information is information on a desired moving image or still image.

Further, the following effects can be obtained: in a stadium or the like, the terminal obtains the symbol 4701 including the position information included in fig. 48, whereby the user using the terminal can easily find the seat.

Fig. 49 shows an example of a frame structure of the optical modulation signal transmitted by the 1 st transmission device 3901_1, the 2 nd transmission device 3901_2, and the 3 rd transmission device 3901_3 in fig. 39C, and the horizontal axis represents time. The frame structure of fig. 49 includes a symbol 4701 including position information in addition to the symbols constituting the frame of fig. 45. For example, in the case where the 1 st transmitting apparatus 3901_1 in fig. 39C transmits the frame structure in fig. 49, it is assumed that the symbol 4701 including the position information includes information in the vicinity of the position where the 1 st transmitting apparatus 3901_1 or the 1 st camera 3902_1 is located. For example, the information may be information of a seat in a stadium.

In this way, the following effects can be obtained: the terminal can obtain information on the position where the moving image or still image to be obtained is captured, and the terminal can determine whether the information is information on a desired moving image or still image.

Further, the following effects can be obtained: in a stadium or the like, the terminal can easily find the seat by the user using the terminal through the symbol 4701 including the position information included in fig. 49.

Fig. 50 shows an example of a frame structure of the optical modulation signal transmitted by the 1 st transmission device 3901_1, the 2 nd transmission device 3901_2, and the 3 rd transmission device 3901_3 in fig. 39C, and the horizontal axis represents time. The frame structure of fig. 50 includes a symbol 4701 including position information in addition to the symbols constituting the frame of fig. 46. For example, in the case where the 1 st transmitting apparatus 3901_1 in fig. 39C transmits the frame structure in fig. 50, it is assumed that the symbol 4701 including the position information includes information in the vicinity of the position where the 1 st transmitting apparatus 3901_1 or the 1 st camera 3902_1 is located. For example, the information may be information of a seat in a stadium.

In this way, the following effects can be obtained: the terminal can obtain information on the position where the moving image or still image to be obtained is captured, and the terminal can determine whether the information is information on a desired moving image or still image.

Further, the following effects can be obtained: in a stadium or the like, the terminal obtains the symbol 4701 including the position information included in fig. 50, whereby the user using the terminal can easily find the seat.

Note that the 1 st terminal 3950_1 and the 2 nd terminal 3950_2 in fig. 39C may have a function of storing the position information included in the symbol 4701 including the position information transmitted by the 1 st transmitting apparatus 3901_1, the 2 nd transmitting apparatus 3901_2, and the 3 rd transmitting apparatus 3901_ 3. Thus, the following advantages are provided: a user holding a terminal can easily call out location information (seat information in a stadium) and can know an access destination for obtaining a moving image or a still image together with the location information.

(supplement 3)

In the embodiments described as "the operation of the Vehicle provided with the communication device" in the present specification, the embodiments can be similarly implemented even if the "Vehicle provided with the communication device" is replaced with a "robot provided with the communication device" or a "Vehicle provided with the communication device" or a "mobile home electric appliance (home electric appliance) provided with the communication device" or a "two-wheeled Vehicle provided with the communication device", "unmanned aerial Vehicle provided with the communication device", "airplane provided with the communication device" or a "vessel provided with the communication device" or a "airship provided with the communication device" or a "ship provided with the communication device".

In embodiment a2, for example, in fig. 40, an example in which the 1 st terminal 3950_1 obtains any of "moving image or image of the 1 st camera 3902_ 1", "moving image or image of the 2 nd camera 3902_ 2", "moving image or image of the 3 rd camera 3902_ 3", "moving image or image of the 4 th camera 3902_ 4" is described, but for example, a 5 th transmitting device 3901_5 may be provided between the 3 rd transmitting device 3901_3 and the 4 th transmitting device 3901_4, and when the 1 st terminal 3950_1 obtains the light modulation signal, a plurality of moving images or images of "moving image or image of the 1 st camera 3902_ 1", "moving image or image of the 2 nd camera 3902_ 2", "moving image or image of the 3 rd camera 3902_ 3", "moving image or image of the 4 th camera 3902_ 4" are used, a moving image or an image estimated to be photographed from the vicinity of the 5 th transmitting apparatus 3901_5 is generated and provided to the 1 st terminal 3950_ 1. The generation of the moving image or image is performed by the server 3905 in fig. 39C, for example, and the moving image or image is provided to the 1 st terminal 3950_1 by the same method as the moving image or image providing method described in embodiment a 2.

The communication system 3970 of fig. 39A of embodiment a2 may be mounted on a robot, a Vehicle, a (movable) home electric appliance (home electric appliance), a two-wheeled Vehicle, an unmanned aerial Vehicle, an airplane, a Vehicle, an airship, a ship, or the like. In addition, when a plurality of cameras are mounted as described above, a "moving image or image" of a "composite or virtual viewpoint" may be generated from moving images or images obtained from the plurality of cameras and provided to the terminal. In fig. 39A, a "moving image or image" of a "synthetic or virtual viewpoint" is generated by, for example, the server 3972. The server may be a signal processing unit.

In the present specification, the name of a server is not limited to this, and may be a signal Processing Unit, a personal computer, a tablet computer, an arithmetic Processing Unit, a CPU, a GPU (Graphics Processing Unit), or the like.

In the above embodiments, each component may be configured by dedicated hardware or may be realized by executing a software program suitable for each component. Each component may be realized by reading and executing a software program recorded in a recording medium such as a hard disk or a semiconductor memory by a program execution unit such as a CPU or a processor. Here, software for realizing the system, the device, or the like of each of the above embodiments is a program as follows.

That is, the program executes a control method of a communication system including a plurality of cameras, a server, and a plurality of transmission devices corresponding to the plurality of cameras in a one-to-one correspondence; in the control method, image data is generated by shooting of the plurality of cameras, and the image data generated by each of the plurality of cameras is stored in the server; the plurality of transmission devices each transmit light including, as a visible light communication signal, information relating to communication for accessing a storage location in the server storing the image data generated by the camera corresponding to the transmission device.

In addition, the program executes a control method of a terminal, which receives light including information indicating a storage location of image data as a visible light communication signal, and receives the image data from the storage location indicated by the received information.

While the communication system and the like according to one or more embodiments have been described above based on the embodiments, the present invention is not limited to the embodiments. The present invention may be embodied in various forms, such as a form in which various modifications of the present embodiment or a form constructed by combining constituent elements of different embodiments, are made, without departing from the spirit of the present invention, within a scope of one or more of the forms.

Industrial applicability

The present invention is useful in acquisition of site information.

Description of the reference symbols

3901_1, 3901_2, 3901_3, 3973A, 3973B, and 3973N transmitter

3902_1, 3902_2, 3902_3, 3971A, 3971B, and 3971N cameras

3903_1, 3903_2, 3903_3, 3906_1, 3906_2, 3907_1, 3907_2, 3909_1, 3909_2, 3910_1, and 3910_2 signals

3908_1, 3908_2 networks

3905. 3972 Server

3911_1 and 3911_2 communication devices

3912_1, 3912_2, 3957_1, 3957_2 modulation signals

3913_1, 3913_2, 3958_1, and 3958_2 receive signals

3950_1 and 3950_2 terminals

3951_1 and 3951_2 receiving device

3952_1 and 3952_2 optical modulation signals

3953_1, 3953_2, 3956_1 and 3956_2 receive data

3954_1 and 3954_2 transceiver

3955_1 and 3955_2 data

3970 communication system

3999 moving image providing system