阅读说明：本技术 初始信号检测方法、装置 (Initial signal detection method and device ) 是由 吴霁 张佳胤 贾琼 于 2019-02-15 设计创作，主要内容包括：一种初始信号检测方法,其特征在于,包括：UE在非授权频谱的一个或者多个子信道上进行检测；根据首次检测到的GC-DMRS和GC-PDCCH的组合,确定下行传输已经开始或者确定COT已经开始。(An initial signal detection method, comprising: the UE detects on one or more sub-channels of an unlicensed spectrum; and determining that downlink transmission has started or determining that COT has started according to the combination of the GC-DMRS and the GC-PDCCH which are detected for the first time.)

1. An initial signal detection method, comprising:

the UE detects on one or more sub-channels of an unlicensed spectrum;

and determining that downlink transmission has started or determining that COT has started according to the combination of the GC-DMRS and the GC-PDCCH which are detected for the first time.

2. The method of claim 1, wherein a search space (search space) of an initial signal of the UE is configured according to one or any combination of the following:

an aggregation level (aggregation level) of the GC-PDCCH in the initial signal is set to a fixed value; alternatively, the first and second electrodes may be,

the maximum number of blind detections of the GC-PDCCH in the initial signal is 1 or 2 per slot.

3. The method of claim 2, receiving configuration information of a search space (search space) of an initial signal of the UE, a configuration in the configuration information being the configuration of claim 2.

4. The method of claim 1, wherein the first detected combination of the GC-DMRS and GC-PDCCH by the UE is located on symbol 1,3 or 7 in one slot, the method further comprising:

the UE continues to retrieve its first UE-specific PDCCH in a search space (search space) of the GC-PDCCH.

5. The method of claim 2, wherein the first UE-specific PDCCH uses an NR DCI1_0 format.

6. The method of claim 1, wherein the first detected combination of the GC-DMRS and the GC-PDCCH by the UE is located at symbol 0 in one slot, wherein the method further comprises:

the UE searches for its UE-specific PDCCH in a search space of the UE-specific PDCCH, except for a search space of the GC-PDCCH.

7. An initial signal transmission method, comprising:

the network side performs LBT on one or more sub-channels of an unlicensed spectrum;

the network side transmits one or more combinations of the GC-DMRS and the GC-PDCCH on one or more sub-channels with successful LBT, wherein one of the one or more combinations of the GC-DMRS and the GC-PDCCH is used as an initial signal for downlink transmission.

8. The method of claim 1, wherein the first and second light sources are selected from the group consisting of,

the configuration of the search space (search space) of the initial signal of one or more UEs conforms to one or any combination of the following:

an aggregation level (aggregation level) of the GC-PDCCH in the initial signal is set to a fixed value; alternatively, the first and second electrodes may be,

the maximum number of blind detections of the GC-PDCCH in the initial signal is 1 or 2 per detected symbol.

9. The method of claim 7, wherein the first and second light sources are selected from the group consisting of,

the network side sends configuration information of a search space (search space) of an initial signal of the one or more UEs, and the configuration in the configuration information is as set in claim 8.

10. The method of claim 1, wherein,

the first sent combination of the GC-DMRS and GC-PDCCH is located at the start position of COT.

11. The method of claim 1, wherein,

and one of the transmitted one or more combinations of the GC-DMRS and the GC-PDCCH is located in a symbol 1,3 or 7 in a slot, wherein the search space of the GC-PDCCH comprises one or a first UE-specific PDCCH of the UE.

12. The method of claim 11, wherein the first UE-specific PDCCH uses an NR DCI1_0 format.

13. The method of claim 1, wherein one of the one or more combinations of the GC-DMRS and GC-PDCCH is located at symbol 0 in one slot, wherein one or more UE-specific PDCCHs are included in a search space of the UE-specific PDCCH outside a search space of the GC-PDCCH.

14. An initial signal detection apparatus for performing the method of any one of claims 1 to 6.

15. An initial signaling device for performing the method of any one of claims 7-13.

16. A computer-readable storage medium storing instructions for performing the method of any one of claims 1-13.

17. A frame structure in wireless communication, the frame structure conforming to the frame structure of any of claims 1-13.

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to an initial signal detection method and apparatus.

Background

The device working in the unlicensed band can automatically detect whether the channel is idle and access the channel to work without authorization. In order to ensure coexistence and fairness with other devices operating in unlicensed frequency bands, the R13 version of 3GPP specifies a channel contention access mechanism using Listen Before Talk (LBT: Listen-Before-Talk).

An eNB operating in an unlicensed band may start LBT at any time, which may end at any time due to uncertainty in the presence and duration of interference generated by other systems. How to efficiently utilize the time domain resources after LBT success is a problem concerned by the present application.

Disclosure of Invention

The present application provides a more efficient initial signal detection mechanism for application to unlicensed spectrum.

In one aspect, an initial signal detection method is provided, including: the UE detects on one or more sub-channels of an unlicensed spectrum; and determining that downlink transmission has started or determining that COT has started according to the combination of the GC-DMRS and the GC-PDCCH which are detected for the first time. Wherein the configuration of the search space (search space) of the initial signal of the UE conforms to one or any combination of the following: an aggregation level (aggregation level) of the GC-PDCCH in the initial signal is set to a fixed value; or, the maximum blind detection times of the GC-PDCCH in the initial signal are 1 or 2 times per slot.

The configuration may be specified by a standard, or the network side configures one or more UEs (e.g. a UE group in a cell). Preferably, the UE locates the first detected combination of the GC-DMRS and the GC-PDCCH in symbol 1,3, or 7 of one slot, and the method further includes: the UE continues to retrieve its first UE-specific PDCCH in a search space (search space) of the GC-PDCCH. The first UE-specific PDCCH uses the NR DCI1_0 format.

In another aspect, a corresponding initial signaling method is provided, comprising: the network side performs LBT on one or more sub-channels of an unlicensed spectrum; the network side transmits one or more combinations of the GC-DMRS and the GC-PDCCH on one or more sub-channels with successful LBT, wherein one of the one or more combinations of the GC-DMRS and the GC-PDCCH is used as an initial signal for downlink transmission. Wherein, the configuration of the search space (searchspace) of the initial signal of one or more UEs conforms to one or any combination of the following: an aggregation level (aggregation level) of the GC-PDCCH in the initial signal is set to a fixed value; or, the maximum number of blind detections of the GC-PDCCH in the initial signal is 1 or 2 times per detected symbol. The configuration may be specified by a standard, that is, configured directly at the time of initializing the communication system, or may be configuration information of a search space (search space) in which the network side transmits the initial signal of the one or more UEs. Specifically, the first combination of the GC-DMRS and the GC-PDCCH is located at the start position of the COT. In another example, one of the transmitted one or more combinations of the GC-DMRS and the GC-PDCCH is located in symbol 1,3, or 7 in one slot, where the search space of the GC-PDCCH includes one or a first UE-specific PDCCH of the UE. The first UE-specific PDCCH uses an NR DCI1_0 format. In another example, one of the one or more combinations of the GC-DMRS and GC-PDCCH is located at symbol 0 in one slot, wherein one or more UE-specific PDCCHs are contained in a search space of the UE-specific PDCCH except for search space of the GC-PDCCH.

The application correspondingly provides a network side device, which comprises a device such as equipment or a single board and a terminal side device comprising a terminal, a chip or other possible devices.

In other aspects, a communication system is provided, the communication system comprising: network equipment and terminal, wherein: the network device may be the aforementioned network device. The terminal is the terminal described above.

In other aspects, a computer-readable storage medium is provided, which has stored thereon instructions, which, when run on a computer, cause the computer to perform the signal transmission method described above.

In other aspects, a computer program product containing instructions which, when run on a computer, cause the computer to perform the above-described signal transmission method is provided.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.

Fig. 1 is a schematic architecture diagram of a wireless communication system provided in the present application;

fig. 2 is a schematic hardware architecture diagram of a terminal device provided by an embodiment of the present application;

FIG. 3 is a hardware architecture diagram of a network device provided by an embodiment of the present application;

FIGS. 4A-4B are schematic diagrams of a Type A/Type B multi-carrier LBT mechanism to which the present application relates;

fig. 5 is a schematic diagram of a slot frame structure in LTE compliant to which the present application relates;

FIG. 6 is a diagram of a micro-slot frame structure according to an embodiment of the present application;

fig. 7 is a simplified diagram of symbol positions where the initial signal is transmitted by the gNB or cell in one embodiment of the present application;

FIGS. 8a, 8b, 8c and 8d are simplified diagrams of detected symbol positions of an initial signal inside and outside the COT in one embodiment of the present application;

fig. 9 is a functional block diagram of a wireless communication system, terminal and network device provided by the present application.

Detailed Description

The terminology used in the description of the embodiments section of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the present application.

Referring to fig. 1, fig. 1 illustrates a wireless communication system 100 to which the present application relates. The wireless communication system 100 may operate in a licensed frequency band and may also operate in an unlicensed frequency band. It will be appreciated that the use of unlicensed frequency bands may increase the system capacity of the wireless communication system 100. As shown in fig. 1, the wireless communication system 100 includes: one or more network devices (base) 101, such as a network device (e.g., a gNB), an eNodeB, or a WLAN access point, one or more terminals (terminals) 103, and a core network 115. Wherein:

the network device 101 may be used to communicate with the terminal 103 under the control of a network device controller, such as a base station controller (not shown). In some embodiments, the network device controller may be part of the core network 115 or may be integrated into the network device 101.

The network device 101 may be configured to transmit control information (control information) or user data (user data) to the core network 115 via a backhaul (e.g., an S1 interface) 113.

Network device 101 may communicate wirelessly with terminal 103 through one or more antennas. Each network device 101 may provide communication coverage for a respective coverage area 107. The coverage area 107 corresponding to the access point may be divided into a plurality of sectors (sectors), wherein one sector corresponds to a portion of the coverage area (not shown).

The network device 101 and the network device 101 may also communicate with each other directly or indirectly through a backhaul (blackhaul) link 211. Here, the backhaul link 111 may be a wired communication connection or a wireless communication connection.

In some embodiments of the present application, network device 101 may include: a base transceiver Station (base transceiver Station), a wireless transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a NodeB, eNodeB, a network device (e.g., gNB), and so on. The wireless communication system 100 may include several different types of network devices 101, such as macro base stations (macro base stations), micro base stations (micro base stations), and so on. Network device 101 may apply different radio technologies, such as a cell radio access technology, or a WLAN radio access technology.

The terminals 103 may be distributed throughout the wireless communication system 100 and may be stationary or mobile. In some embodiments of the present application, the terminal 103 may include: mobile devices, mobile stations (mobile stations), mobile units (mobile units), wireless units, remote units, user agents, mobile clients, and the like. In the present application, a terminal may also be understood as a terminal device.

In this application, the wireless communication system 100 may be an LTE communication system capable of operating in an unlicensed frequency band, such as an LTE-U system, a new air interface communication system capable of operating in an unlicensed frequency band, such as an NRU system, or another communication system capable of operating in an unlicensed frequency band in the future.

Additionally, the wireless communication system 100 may also include a WiFi network.

Referring to fig. 2, fig. 2 illustrates a terminal 300 provided by some embodiments of the present application. As shown in fig. 2, the terminal 300 may include: input-output modules (including audio input-output module 318, key input module 316, and display 320, etc.), user interface 302, one or more terminal processors 304, transmitter 306, receiver 308, coupler 310, antenna 314, and memory 312. These components may be connected by a bus or other means, with fig. 2 exemplified by a bus connection. Wherein:

communication interface 301 may be used for terminal 300 to communicate with other communication devices, such as base stations. Specifically, the base station may be the network device 400 shown in fig. 3. The communication interface 301 refers to an interface between the terminal processor 304 and a transceiving system (composed of the transmitter 306 and the receiver 308), for example, an X1 interface in LTE. In a specific implementation, the communication interface 301 may include: one or more of a Global System for Mobile Communication (GSM) (2G) Communication interface, a Wideband Code Division Multiple Access (WCDMA) (3G) Communication interface, and a Long Term Evolution (LTE) (4G) Communication interface, and the like, and may also be a Communication interface of 4.5G, 5G, or a future new air interface. The terminal 300 may be configured with a wired communication interface 301, such as a Local Access Network (LAN) interface, without being limited to a wireless communication interface.

The antenna 314 may be used to convert electromagnetic energy in the transmission line to electromagnetic energy in free space or vice versa. The coupler 310 is used to split the mobile communication signal received by the antenna 314 into multiple paths for distribution to the plurality of receivers 308.

The transmitter 306 may be configured to perform transmit processing on the signal output by the terminal processor 304, such as modulating the signal in a licensed frequency band or modulating the signal in an unlicensed frequency band.

Receiver 308 may be used for receive processing of mobile communication signals received by antenna 314. For example, the receiver 308 may demodulate a received signal modulated on an unlicensed frequency band, and may also demodulate a received signal modulated on a licensed frequency band.

In some embodiments of the present application, the transmitter 306 and the receiver 308 may be considered to be one wireless modem. In the terminal 300, the number of the transmitters 306 and the receivers 308 may be one or more.

In addition to the transmitter 306 and receiver 308 shown in fig. 2, the terminal 300 may also include other communication components, such as a GPS module, a Bluetooth (Bluetooth) module, a Wireless Fidelity (Wi-Fi) module, and so forth. Not limited to the above-described wireless communication signals, the terminal 300 may also support other wireless communication signals, such as satellite signals, short-wave signals, and so forth. Not limited to wireless communication, the terminal 300 may also be configured with a wired network interface (e.g., a LAN interface) to support wired communication.

The input and output module may be used to enable interaction between the terminal 300 and a user/external environment, and may mainly include an audio input and output module 318, a key input module 316, a display 320, and the like. In a specific implementation, the input/output module may further include: cameras, touch screens, sensors, and the like. Wherein the input output modules are in communication with a terminal processor 304 through a user interface 302.

Memory 312 is coupled to terminal processor 304 for storing various software programs and/or sets of instructions. In particular implementations, memory 312 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid-state storage devices. The memory 312 may store an operating system (hereinafter referred to simply as a system), such as an embedded operating system like ANDROID, IOS, WINDOWS, or LINUX. The memory 312 may also store a network communication program that may be used to communicate with one or more additional devices, one or more terminal devices, one or more network devices. The memory 312 may further store a user interface program, which may vividly display the content of the application program through a graphical operation interface, and receive a control operation of the application program from a user through input controls such as menus, dialog boxes, and buttons.

In some embodiments of the present application, the memory 312 may be used to store an implementation program of the signal transmission method provided in one or more embodiments of the present application on the terminal 300 side. For the implementation of the signal transmission method provided in one or more embodiments of the present application, please refer to the following embodiments.

The terminal processor 304 is operable to read and execute computer readable instructions. Specifically, the terminal processor 304 may be configured to call a program stored in the memory 312, for example, a program implemented on the terminal 300 side by the signal transmission method provided in one or more embodiments of the present application, and execute instructions contained in the program.

It is to be appreciated that the terminal 300 can be the terminal 103 in the wireless communication system 100 shown in fig. 1 and can be implemented as a mobile device, a mobile station (mobile station), a mobile unit (mobile unit), a wireless unit, a remote unit, a user agent, a mobile client, and the like.

It should be noted that the terminal 300 shown in fig. 2 is only one implementation manner of the present application, and in practical applications, the terminal 300 may further include more or less components, and is not limited herein.

Referring to fig. 3, fig. 3 illustrates a network device 400 provided by some embodiments of the present application. As shown in fig. 3, network device 400 may include: a communication interface 403, one or more base station processors 401, a transmitter 407, a receiver 409, a coupler 411, an antenna 413, and a memory 405. These components may be connected by a bus or other means, with fig. 3 exemplified by a bus connection.

Wherein:

communication interface 403 may be used for network device 400 to communicate with other communication devices, such as terminal devices or other base stations. Specifically, the terminal device may be the terminal 300 shown in fig. 2. The communication interface 301 refers to an interface between the base station processor 401 and a transceiving system (composed of the transmitter 407 and the receiver 409), for example, an S1 interface in LTE. In a specific implementation, the communication interface 403 may include: one or more of a global system for mobile communications (GSM) (2G) communication interface, a Wideband Code Division Multiple Access (WCDMA) (3G) communication interface, and a Long Term Evolution (LTE) (4G) communication interface, etc., and may also be a communication interface of 4.5G, 5G, or a future new air interface. Not limited to wireless communication interfaces, network device 400 may also be configured with a wired communication interface 403 to support wired communication, e.g., a backhaul link between one network device 400 and other network devices 400 may be a wired communication connection.

The antenna 413 may be used to convert electromagnetic energy in the transmission line into electromagnetic waves in free space, or vice versa. Coupler 411 may be used to multiplex the mobile communications signal to a plurality of receivers 409.

The transmitter 407 may be configured to perform transmission processing on the signal output by the bs processor 401, such as modulating the signal in a licensed frequency band or modulating the signal in an unlicensed frequency band.

Receiver 409 may be used for receive processing of mobile communication signals received by antenna 413. For example, the receiver 409 may demodulate a received signal modulated on an unlicensed frequency band, and may also demodulate a received signal modulated on a licensed frequency band.

In some embodiments of the present application, the transmitter 407 and the receiver 409 may be considered as one wireless modem. In the network device 400, the number of the transmitters 407 and the receivers 409 may be one or more.

Memory 405 is coupled to the base station processor 401 for storing various software programs and/or sets of instructions. In particular implementations, memory 405 may include high speed random access memory and may also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid state storage devices. The memory 405 may store an operating system (hereinafter, referred to as a system), such as an embedded operating system like uCOS, VxWorks, RTLinux, or the like. Memory 405 may also store network communication programs that may be used to communicate with one or more additional devices, one or more terminal devices, one or more network devices.

The base station processor 401 may be used to perform radio channel management, implement call and communication link setup and teardown, control handover for user equipment within the control area, and the like. In a specific implementation, the base station processor 401 may include: an Administration/Communication Module (AM/CM) (a center for voice channel switching and information switching), a Basic Module (BM) (for performing call processing, signaling processing, radio resource management, management of a radio link, and circuit maintenance functions), a code conversion and sub-multiplexing unit (TCSM) (for performing multiplexing/demultiplexing and code conversion functions), and so on.

In the present application, the base station processor 401 may be configured to read and execute computer readable instructions. Specifically, the base station processor 401 may be configured to call a program stored in the memory 405, for example, an implementation program of the signal transmission method provided in one or more embodiments of the present application on the network device 400 side, and execute instructions contained in the program.

It is understood that the network device 400 may be the network device 101 in the wireless communication system 100 shown in fig. 1, and may be implemented as a base transceiver station, a wireless transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a NodeB, an eNodeB, and so on. The network device 400 may be implemented as several different types of base stations, such as macro base stations, micro base stations, etc. Network device 400 may apply different radio technologies, such as a cell radio access technology, or a WLAN radio access technology.

It should be noted that the network device 400 shown in fig. 3 is only one implementation manner of the present application, and in practical applications, the network device 400 may also include more or less components, which is not limited herein.

For convenience of the following description, technical terms that may be referred to herein are provided.

In order to ensure coexistence with other devices operating in unlicensed frequency bands, the NRU system employs the channel contention access mechanism of LBT, and the procedures and parameters of LBT are specified in release R13 of 3 GPP. Fig. 4A-4B illustrate two types of LBT listening mechanisms.

As shown in fig. 4A, a type a (type a) LBT device may perform independent backoff on multiple Component Carriers (CCs), and delay transmission to wait for other component carriers still in backoff after backoff on a certain carrier is completed. When all carriers performing LBT complete backoff, the device needs to make an additional one-shot CCA (25 user channel assignment) to ensure that all carriers are idle; if all carriers are idle, the eNB transmits simultaneously on the idle carrier.

As shown in fig. 4B, the type B (type B) LBT device performs backoff only on a certain selected component carrier, performs one-shot CCA (25us clear channel assessment) review on other component carriers when backoff is finished, and performs data transmission if the component carrier is idle; if the component carrier is not idle, the component carrier cannot be transmitted with data at this time.

As shown in fig. 4A-4B, the LBT device may be LTE LAA, WiFi, NRU or other communication devices operating in unlicensed (unlicensed) frequency band. In the figure, interference received by the device performing LBT comes from a WiFi system, and in an actual scenario, the interference received by the device performing LBT may also come from LTE LAA, NRU or other communication systems operating in an unlicensed frequency band, which is not limited in this application.

Without being limited to the embodiments shown in fig. 4A-4B, the LBT listening mechanism employed by the NR U system may also be changed without affecting the implementation of the present application.

The frame structure applied in the present application may be a radio frame structure of LTE or its evolution versions. For example, as shown in fig. 5, a typical frame structure specified in LTE includes 14 OFDM symbols (hereinafter, referred to as symbols) in one scheduling slot (slot), where the first 1,2, or 3 symbols carry control information (DCI), and the last 11, 12, or-13 symbols carry data. In the new air interface NR, in order to improve flexibility of system scheduling, a micro-scheduling slot (mini-slot) is introduced, and the length of the micro-scheduling slot may be 2,4, or 7 OFDM symbols. In the example shown in FIG. 6, the 1 slot includes 3 mini-slots of 4 symbols and 1 mini-slot of 2 symbols. Of course, other mini-slot combinations are also possible. In each mini-slot, the control resource set (CORESET) of the mini-slot is carried on the first n symbols from the 1 st symbol, and is used for carrying the scheduling information (DCI) of the mini-slot. Specifically, n is a natural number and is smaller than the number of symbols in the mini-slot. Preferably, n is not more than 3.

The GC-DCI and the UE-specific DCI mentioned in the application: the difference between the two is that GC-DCI is scrambled by GC-RNTI, and all UE associated with gNB can be analyzed by the GC-RNTI; the UE-specific DCI is generally scrambled by the C-RNTI of each UE, contains the downlink scheduling information of the UE, and other UEs do not need to be analyzed.

Based on the foregoing embodiments corresponding to the wireless communication system 100, the terminal 300, and the network device 400, respectively, the present application provides a signal transmission method, a method for sending an initial signal after a network-side LBT succeeds and for detecting the initial signal at a UE side, and corresponding apparatuses and systems.