阅读说明：本技术 无线通信装置、无线通信系统和无线通信方法 (Wireless communication device, wireless communication system, and wireless communication method ) 是由 铃木和雅 石冈和明 佐野裕康 于 2017-07-19 设计创作，主要内容包括：无线通信装置(1A、2A)具有：使用信道选择部(15),其按照每个时隙从预定的多个频道的候选中选择一个频道；以及无线通信部(12),其使用由使用信道选择部选择出的频道进行无线通信。其特征在于,使用信道选择部(15)选择与接近的小区在相同时隙中使用的频道不同的频道,容许远程小区在相同时隙中使用的频道和选择出的频道重复,其中,该接近的小区是从无线通信中使用的小区起的小区数为预定的第1小区数以内的小区,该远程小区是从无线通信中使用的小区起的小区数为频道的候选的数量以内且比第1小区数大的小区。(A wireless communication device (1A, 2A) comprises: a channel selection unit (15) for selecting one frequency channel from a plurality of predetermined frequency channel candidates for each time slot; and a wireless communication unit (12) that performs wireless communication using the frequency channel selected by the use channel selection unit. The channel selection unit (15) selects a frequency channel different from a frequency channel used in the same time slot as a neighboring cell that is a cell having a number of cells from the cell used in wireless communication within a predetermined number of 1 st cells and allows the selected frequency channel to overlap with the frequency channel used in the same time slot by a remote cell that is a cell having a number of cells from the cell used in wireless communication within the number of candidates for the frequency channel and greater than the number of 1 st cells.)

1. A wireless communication apparatus, characterized in that the wireless communication apparatus has:

a channel selection unit that selects one frequency channel from a plurality of predetermined frequency channel candidates for each time slot; and

a wireless communication unit that performs wireless communication using the frequency channel selected by the usage channel selection unit,

the used channel selection unit selects a frequency channel different from a frequency channel used in the same time slot as an adjacent cell, which is a cell having a number of cells from the cell used in the radio communication within a predetermined 1 st cell number, and which is larger than the 1 st cell number and whose number is within the number of candidates for the frequency channel, and allows a remote cell, which is a cell having a number of cells from the cell used in the radio communication within a predetermined 1 st cell number, to overlap the selected frequency channel.

2. The wireless communication apparatus of claim 1,

the number of cells between a cell used in the radio communication and a cell using the same frequency channel in all time slots is larger than the number of candidates for the frequency channel.

3. The wireless communication device according to claim 1 or 2,

the used channel selection unit determines the frequency channel to be used by using the interval of the frequency channel between the time slots and the offset between the cells.

4. The wireless communication apparatus of claim 3,

the used channel selection unit extracts a plurality of frequency channels for each of the time slots by using different intervals between the frequency channels and offsets between cells in the 2 time slots, and selects one of the frequency channels based on a quality value indicating a communication quality for each of the frequency channels.

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

the radio communication apparatus is any one of a plurality of base stations installed along a predetermined route and forming the cell, or a mobile station moving along the route, and the radio communication is performed between the base station and the mobile station located in the cell formed by the base station.

6. The wireless communication apparatus of claim 5,

the wireless communication device is the base station,

the used channel selection unit selects the frequency channel to be used by using the frequency channel interval between the time slots and the offset between cells, which are previously allocated to each base station.

7. The wireless communication apparatus of claim 5,

the wireless communication device is the mobile station and,

the used channel selection unit acquires, from the base station, which is the partner device of the wireless communication, the interval of frequency channels between the time slots and the offset between cells, which are allocated in advance for each of the base stations, and selects the frequency channel to be used using the acquired interval of frequency channels between the time slots and the offset between the cells.

8. The wireless communication apparatus of claim 4,

the wireless communication device is a base station forming the cell,

the radio communication unit notifies a mobile station located in the cell formed by the base station of selection information indicating the frequency channel selected by the use channel selection unit for each of the time slots.

9. The wireless communication apparatus of claim 5,

the path is a rail, and the mobile station is mounted on a train running on the rail.

10. The wireless communication apparatus of claim 1,

the used channel selection unit has a table for specifying a hopping pattern of a frequency channel to be used for each of the slots, and selects the frequency channel to be used according to the table.

11. A wireless communication system, characterized in that,

the wireless communication system has a base station arranged along a predetermined path and a mobile station located in a cell formed by the base station and moving along the path,

performing wireless communication between the base station and the mobile station by switching a frequency channel to be used from a plurality of frequency channel candidates for each time slot,

the base station and the mobile station select frequency channels different from frequency channels used in the same time slot as that of an adjacent cell, which is a cell having a number of cells from the cell used in the radio communication within a predetermined number of 1 st cells, and allow the frequency channels used in the same time slot by a remote cell, which is a cell having a number of cells from the cell used in the radio communication within a predetermined number of candidates for the frequency channels and greater than the number of 1 st cells, to overlap with the selected frequency channels, respectively.

12. A radio communication method for performing radio communication by switching a frequency channel to be used from a plurality of frequency channel candidates for each slot between a base station arranged along a predetermined path and a mobile station located in a cell formed by the base station and moving along the path,

the base station and the mobile station select frequency channels different from frequency channels used in the same time slot as that of an adjacent cell, which is a cell having a number of cells from the cell used in the radio communication within a predetermined number of 1 st cells, and allow the frequency channels used in the same time slot by a remote cell, which is a cell having a number of cells from the cell used in the radio communication within a predetermined number of candidates for the frequency channels and greater than the number of 1 st cells, to overlap with the selected frequency channels, respectively.

Technical Field

The present invention relates to a wireless communication apparatus, a wireless communication system, and a wireless communication method using frequency hopping.

Background

In recent years, the following wireless train control systems have been attracting attention: wireless communication is performed between a ground station installed along a track and a train, and operation control, speed control, and the like of the train are performed based on information transmitted by the wireless communication. In many wireless train control systems, an ISM (Industry-Science-Medical) band of 2.4GHz is used, which does not require permission to use radio waves. The ISM band is widely used in systems such as wireless lan (local Area network) and Bluetooth (registered trademark), and therefore, a spread spectrum technique is sometimes used to suppress interference with radio waves of other systems. Spread spectrum technology is a technology for performing communication by spreading a signal over a wider frequency band than the original signal.

Patent document 1 discloses a wireless communication system using frequency hopping, which is one of spread spectrum techniques. Frequency hopping is a technique of performing wireless communication using frequency channels different for each time slot. In the system described in patent document 1, 2 hopping patterns different from each other are prepared for frequency channels corresponding to the same time slot, and a frequency channel to be used is selected from the 2 hopping patterns for each time slot according to the radio wave situation.

Disclosure of Invention

Problems to be solved by the invention

However, the number of hopping patterns in which the frequency channels used simultaneously in all the time slots do not overlap is the same as the number of candidates for the frequency channel used. Therefore, according to the technique described in patent document 1, the intervals of cells using the same hopping pattern become the maximum number of candidates for frequency channels. In the case where base stations are arranged along a track as in the above-described wireless train control system, there is a problem that visibility between base stations is often good, interference from radio waves from other base stations is highly likely to be received, and interference of radio waves in the system increases.

The present invention has been made in view of the above circumstances, and an object thereof is to obtain a radio communication apparatus capable of suppressing interference of radio waves in a system.

Means for solving the problems

In order to solve the above problems and achieve the object, a wireless communication apparatus according to the present invention includes: a channel selection unit that selects one frequency channel from a plurality of predetermined frequency channel candidates for each time slot; and a wireless communication unit that performs wireless communication using the frequency channel selected by the use channel selection unit. The channel selection unit selects a frequency channel different from a frequency channel used in the same time slot as a neighboring cell, which is a cell having a number of cells from a cell used in wireless communication within a predetermined number of 1 st cells, and allows a remote cell, which is a cell having a number of cells from a cell used in wireless communication within the number of candidates for a frequency channel and greater than the number of 1 st cells, to overlap the selected frequency channel.

ADVANTAGEOUS EFFECTS OF INVENTION

The radio communication apparatus according to the present invention exhibits an effect of suppressing interference of radio waves in the system.

Drawings

Fig. 1 is a diagram showing a configuration of a wireless communication system according to embodiment 1 of the present invention.

Fig. 2 is a diagram illustrating a functional structure of the base station shown in fig. 1.

Fig. 3 is a diagram showing a schematic configuration of the vehicle shown in fig. 1.

Fig. 4 is a diagram showing a functional configuration of the mobile station shown in fig. 1.

Fig. 5 is a diagram showing an example 1 of the configuration of a processing circuit for realizing the functions of the base station and the mobile station shown in fig. 1.

Fig. 6 is a diagram showing an example of the configuration 2 of a processing circuit for realizing the functions of the base station and the mobile station shown in fig. 1.

Fig. 7 is a sequence diagram showing an operation of the wireless communication system shown in fig. 1.

Fig. 8 is a diagram showing a frame structure transmitted in the action shown in fig. 7.

Fig. 9 is a diagram illustrating a concept of a frequency channel allocation method for each base station in the wireless communication system illustrated in fig. 1.

Fig. 10 is a diagram showing an example of the frequency hopping pattern generated by the channel selector shown in fig. 2 and 4.

Fig. 11 is a diagram showing a configuration of a wireless communication system according to embodiment 2 of the present invention.

Fig. 12 is a diagram showing an example of the configuration of the database generated by the monitoring apparatus shown in fig. 11.

Fig. 13 is a diagram illustrating a structure of the base station shown in fig. 11.

Fig. 14 is a diagram showing an example of the 1 st pattern of the hopping patterns generated by the channel selector shown in fig. 13.

Fig. 15 is a diagram showing an example of the 2 nd pattern of the hopping pattern generated by the channel selector shown in fig. 13.

Fig. 16 is a diagram showing a modification of the 1 st pattern of the hopping pattern generated by the channel selector shown in fig. 13.

Fig. 17 is a diagram showing a modification of the 2 nd pattern of the hopping pattern generated by the channel selector shown in fig. 13.

Fig. 18 is a diagram showing a configuration of the mobile station shown in fig. 11.

Fig. 19 is a sequence diagram showing an operation of the wireless communication system shown in fig. 11.

Detailed Description

Hereinafter, a radio communication apparatus, a radio communication system, and a radio communication method according to embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiment.