A communication method and device

Abstract

A communication method and device, the method comprising: a first communication device obtains service quality information and / or channel status information of a positioning service, the channel status information is used to indicate the busyness of a channel; according to the service quality information and / or channel status information, a listen-before-talk configuration information is determined, the listen-before-talk configuration information is used to indicate a channel access scheme of a terminal; the listen-before-talk configuration information is sent; and / or, according to the listen-before-talk configuration information, a channel is accessed and a second positioning reference signal is sent through the channel. Based on this method, a channel access scheme can be reasonably determined according to the service quality information and / or channel status information to support access to a channel and perform ranging or sidelink positioning in an unlicensed spectrum.

Description

Technical Field

[0001] The present application relates to the field of mobile communication technology, and in particular to a communication method and device. Background Art

[0002] In the current new radio (NR) sidelink (SL), in order to support ranging and sidelink positioning of the sidelink, terminals can send and measure sidelink positioning reference signals (SL-PRS). For example, a terminal device as a transmitter (hereinafter referred to as a transmitter terminal device) can send SL-PRS to a terminal device as a receiver (hereinafter referred to as a receiver terminal device) through a sidelink, and correspondingly, the receiver terminal device can receive and measure SL-PRS through the sidelink to obtain positioning measurement values.

[0003] When SL communication occurs in an unlicensed spectrum, according to the laws and regulations of the relevant countries / regions, before sending, the transmitting terminal device needs to access the unlicensed frequency band through a competition mechanism (such as a listen before talk (LBT) mechanism). In addition, the current positioning service requires the terminal device to send SL-PRS on multiple channels separately, which means that the terminal device needs to perform LBT on multiple channels before sending the positioning reference signal. This current requirement may cause the positioning service to exceed the delay limit, resulting in the failure of the sidelink positioning service. Summary of the invention

[0004] The present application provides a communication method and apparatus for proposing a channel access solution that supports positioning services in an unlicensed spectrum scenario.

[0005] In a first aspect, a communication method is provided. The method may be implemented by a first communication device. The first communication device may be a terminal device, a network device, a component of a terminal device, or a component of a network device that supports SL communication. Exemplarily, the first communication device may be a device or apparatus for determining LBT configuration information. Among them, the components in the present application may include at least one of a chip, a chip system, a processor, a transceiver, a processing unit, or a transceiver unit. Taking the execution subject as the first communication device as an example, the method can be implemented by the following steps: obtaining service quality information and / or channel status information of the positioning service, the channel status information is used to indicate the busyness of the channel; determining LBT configuration information according to the service quality information and / or channel status information, the LBT configuration information is used to indicate the channel access scheme of the terminal; sending the LBT configuration information; and / or, accessing the channel according to the LBT configuration information and sending a second positioning reference signal through the channel.

[0006] Based on the method shown in the first aspect, the first communication device can determine the LBT configuration information according to the service quality information and / or channel status information of the positioning service, wherein the LBT configuration information can be used to indicate the channel access scheme of the terminal. Subsequently, the first communication device can send the LBT configuration information so that other communication devices supporting SL positioning can perform LBT to access the channel according to the channel access scheme indicated by the LBT configuration information, and send a positioning reference signal after accessing the channel. In addition, the first communication device can also perform LBT to access the channel according to the channel access scheme indicated by the LBT configuration information, and send a positioning reference signal after accessing the channel.

[0007] It can be understood that since the LBT configuration information is determined based on the service quality information and / or channel status information of the positioning service, the method can determine a channel access solution that meets the service quality requirements of the positioning service and / or meets the channel busyness, thereby reducing the probability of positioning service failure due to LBT failure, and improving the reliability of positioning services in unlicensed spectrum scenarios.

[0008] In one possible implementation, the LBT configuration information includes at least one of the following: configuration information of the positioning reference signal; the number of accessed channels M, where M is a positive integer; time information for executing listen-before-talk; and channel access scheme indication information, where the channel access scheme indication information is used to indicate the channel access scheme.

[0009] In a possible implementation, the channel access scheme includes at least one of a first channel access scheme, a second channel access scheme, and a third channel access scheme; or, the channel access scheme indication information is used to indicate at least one of the first channel access scheme, the second channel access scheme, and the third channel access scheme. The first channel access scheme requires access to the channel when the monitoring results of M channels are all idle, M is a positive integer greater than 1; the second channel access scheme requires access to the channel when the monitoring results of at least N1 channels are all idle, N1 is a positive integer greater than 1; the third channel access scheme requires access to the channel when at least the channel at the specified position is idle.

[0010] In a possible implementation manner, the service quality information includes one or more of the following: type, accuracy or response time of the service quality.

[0011] In one possible implementation, when the quality of service type is a guarantee level, the channel access plan may include the first channel access plan; when the quality of service type is a guarantee level or multiple quality of service categories, the channel access plan may include the second channel access plan; when the quality of service type is a guarantee level or multiple quality of service categories, the channel access plan may include the third channel access plan; when the channel status information indicates that the channel is busy, the channel access plan may include the second channel access plan or the third channel access plan; when the channel status information indicates that the channel is not busy, the channel access plan may include the first channel access plan or the second channel access plan.

[0012] When the response time requirement in the quality of service information is no delay, a more relaxed channel access scheme can be selected to meet the delay requirement, for example, the channel access scheme can be the second channel access scheme or the third channel access scheme. When the response time requirement in the quality of service information is low delay, a more relaxed channel access scheme can be selected to meet the delay requirement, for example, the channel access scheme can be the second channel access scheme or the third channel access scheme. When the response time requirement in the quality of service information is delay tolerance, a more stringent channel access scheme can be selected to meet the positioning QoS requirements, for example, the channel access scheme can be the first channel access scheme or the second channel access scheme.

[0013] In addition, the accuracy in the quality of service information may be related to the positioning method. The positioning method may include a positioning method based on a downlink time difference of arrival (SL-TDOA) (which may be referred to as SL-TDOA for short), a positioning method based on a sidelink angle of arrival (SL-AoA) (which may be referred to as SL-AoA for short), a positioning method based on a sidelink angle of departure (SL-AoD) (which may be referred to as SL-AoD for short), a single-sided round trip time (single-sided RTT), a multi-round trip time (multi-RTT), etc. Among them, if a time-based positioning method such as SL-TDOA, a single-sided round trip time, or a multi-sided round trip time is adopted, the bandwidth requirement may be high at this time, and the channel access scheme may be a more stringent LBT scheme to meet the positioning QoS requirements, such as the first LBT scheme or the second LBT scheme. If an angle-based positioning method, such as SL-AoA and SL-AoD, is used, the bandwidth requirement may be lower, and the channel access scheme may be a more relaxed LBT scheme, such as the second LBT scheme or the third LBT scheme.

[0014] In addition, when determining a channel access scheme according to the quality of service information and the channel status information, if the channel status information indicates that the channel is busy, a more relaxed channel access scheme can be further selected based on the channel access scheme determined according to the quality of service information. The relaxation degree of the first LBT scheme is lower than the relaxation degree of the second LBT scheme, and the relaxation degree of the second LBT scheme is lower than the relaxation degree of the third LBT scheme.

[0015] Based on this implementation, a multi-channel channel access scheme can be reasonably determined according to the service quality information to meet the multi-channel transmission requirements of different service quality information. In addition, a channel access scheme can be reasonably determined according to the channel status information, thereby determining a multi-channel channel access scheme under different channel busyness levels.

[0016] In a possible implementation manner, the first communication device may also obtain indication information of the designated location.

[0017] In a possible implementation, the LBT configuration information further includes a first indication, where the first indication is used to indicate that a positioning reference signal is sent on one or more channels whose monitoring result within the time indicated by the time information is that the channel is idle.

[0018] Correspondingly, the first indication information may instruct the sending device of the positioning reference signal to send the positioning reference signal in an idle channel within the time indication information, so as to avoid positioning failure caused by LBT failure as much as possible, thereby improving positioning efficiency.

[0019] In a possible implementation, the first communication device may also send the LBT configuration information to the second communication device, and the configuration information is used to monitor the channel according to the configuration information and send the first positioning reference signal through the channel. In this case, the first communication device can serve as a target terminal and the second communication device can serve as an anchor terminal.

[0020] In a possible implementation, the first communication device may also measure the first positioning reference signal sent by the second communication device through a channel to obtain measurement data, and the measurement data is used to obtain the location information of the positioning target. The positioning target may be the first communication device, the second communication device, or may be another communication device or object. For example, the measurement data may be used to solve the position of the first UE, or the relative position of the first UE and the second UE, or the distance and direction between the first UE and the second UE, and so on.

[0021] In a possible implementation, the LBT configuration information is carried in channel occupancy time (COT) sharing information; and / or, the LBT configuration information is carried in a sidelink positioning protocol (SLPP) message.

[0022] For example, in a multi-RTT scenario, the first communication device may send LBT configuration information to the second communication device via COT shared information. In this case, the LBT configuration information may be carried in the COT shared information sent by the first communication device to the second communication device.

[0023] In a second aspect, a communication method is provided. The method can be implemented by a second communication device. The second communication device can be a terminal device, a network device, a component of a terminal device, or a component of a network device that supports SL communication. Exemplarily, the second communication device can be a device or apparatus that performs LBT. Taking the execution subject as the second communication device as an example, the method can be implemented by the following steps: the second communication device can receive LBT configuration information, and the LBT configuration information is used to indicate the channel access scheme of the terminal, and the LBT configuration information is determined based on the service quality information and / or channel status information of the positioning service, and the channel status information is used to indicate the busyness of the channel; the second communication device can access the channel according to the LBT configuration information, and send a first positioning reference signal through the channel.

[0024] The beneficial effects of the second aspect and its various possible implementations can refer to the description of the beneficial effects of the first aspect and its corresponding implementations, and the repeated parts will not be repeated.

[0025] In a possible implementation, the LBT configuration information includes at least one of the following: configuration information of a positioning reference signal; the number of accessed channels M, where M is a positive integer; and channel access scheme indication information, where the channel access scheme indication information is used to indicate a channel access scheme.

[0026] In one possible implementation, the channel access scheme may include at least one of a first channel access scheme, a second channel access scheme and a third channel access scheme; wherein the first channel access scheme requires accessing the channel when the monitoring results of M channels are all idle, and M is a positive integer greater than 1; the second channel access scheme requires accessing the channel when the monitoring results of at least N1 channels are all idle, and N1 is a positive integer greater than 1; the third channel access scheme requires accessing the channel when at least the channel at a specified position is idle.

[0027] In a possible implementation manner, the first information is service quality information of the positioning service, including the type, accuracy or response time of the service quality.

[0028] In one possible implementation, when the quality of service type is a guarantee level, the channel access plan may include the first channel access plan; when the quality of service type is a guarantee level or multiple quality of service categories, the channel access plan may include the second channel access plan; when the quality of service type is a guarantee level or multiple quality of service categories, the channel access plan may include the third channel access plan; when the channel status information indicates that the channel is busy, the channel access plan may include the second channel access plan or the third channel access plan; when the channel status information indicates that the channel is not busy, the channel access plan may include the first channel access plan or the second channel access plan.

[0029] When the response time requirement in the quality of service information is no delay, a more relaxed channel access scheme can be selected to meet the delay requirement, for example, the channel access scheme can be the second channel access scheme or the third channel access scheme. When the response time requirement in the quality of service information is low delay, a more relaxed channel access scheme can be selected to meet the delay requirement, for example, the channel access scheme can be the second channel access scheme or the third channel access scheme. When the response time requirement in the quality of service information is delay tolerance, a more stringent channel access scheme can be selected to meet the positioning QoS requirements, for example, the channel access scheme can be the first channel access scheme or the second channel access scheme.

[0030] In addition, the accuracy in the quality of service information may be related to the positioning method. If a time-based positioning method is used, such as SL-TDOA, single-side round-trip time, or multi-side round-trip time, the bandwidth requirement may be high. At this time, the channel access scheme may be a more stringent LBT scheme to meet the positioning QoS requirements, such as the first LBT scheme or the second LBT scheme. If an angle-based positioning method is used, such as SL-AoA and SL-AoD, the bandwidth requirement may be low, and the channel access scheme may be a more relaxed LBT scheme, such as the second LBT scheme or the third LBT scheme.

[0031] In addition, when determining a channel access scheme according to the quality of service information and the channel status information, if the channel status information indicates that the channel is busy, a more relaxed channel access scheme can be further selected based on the channel access scheme determined according to the quality of service information. The relaxation degree of the first LBT scheme is lower than the relaxation degree of the second LBT scheme, and the relaxation degree of the second LBT scheme is lower than the relaxation degree of the third LBT scheme.

[0032] In a possible implementation manner, the second communication device may also obtain indication information of the designated location.

[0033] In a possible implementation, the LBT configuration information also includes a first indication, which is used to indicate that a positioning reference signal is sent to one or more channels whose monitoring results within the time indicated by the time information are that the channel is idle; the second communication device may also send the first positioning reference signal to a channel whose monitoring result within the time indicated by the time information is that the channel is idle.

[0034] In a possible implementation, the second communication device may also measure the second positioning reference signal of the positioning service sent by the first communication device through the channel to obtain measurement data, where the measurement data is used to acquire the position information of the positioning target.

[0035] In a possible implementation, the second communication device may access the channel through a type 1 listen-before-talk procedure or a type 2 listen-before-talk procedure according to the LBT configuration information.

[0036] In a possible implementation, the LBT configuration information is carried in COT shared information; and / or, the LBT configuration information is carried in a Side Link Positioning Protocol SLPP message.

[0037] In a third aspect, a communication device is provided. The device can implement the method described in any possible design of the first aspect or the second aspect. The device has the functions of the first communication device and / or the second communication device. The device is, for example, a terminal device, or a functional module in a terminal device, or a network device or a functional module in a network device.

[0038] In an optional implementation, the device may include a module corresponding to the method / operation / step / action described in the first aspect or the second aspect, and the module may be a hardware circuit, or software, or a combination of a hardware circuit and software. In an optional implementation, the device includes a processing unit (sometimes also referred to as a processing module) and a communication unit (sometimes also referred to as a transceiver module, a communication module, etc.). The transceiver unit can implement a sending function and a receiving function. When the transceiver unit implements the sending function, it may be referred to as a sending unit (sometimes also referred to as a sending module), and when the transceiver unit implements the receiving function, it may be referred to as a receiving unit (sometimes also referred to as a receiving module). The sending unit and the receiving unit may be the same functional module, which is called a transceiver unit, and the functional module can implement a sending function and a receiving function; or, the sending unit and the receiving unit may be different functional modules, and the transceiver unit is a general term for these functional modules.

[0039] Exemplarily, when the device is used to execute the method described in the first aspect or the second aspect, the device may include a communication unit and a processing unit.

[0040] In a fourth aspect, an embodiment of the present application also provides a communication device, comprising a processor for executing a computer program (or computer executable instructions) stored in a memory, so that when the computer program (or computer executable instructions) is executed, the device performs a method as in the first aspect or the second aspect and its various possible implementations.

[0041] In one possible implementation, the processor and the memory are integrated together;

[0042] In another possible implementation, the memory is located outside the communication device.

[0043] The communication device also includes a communication interface, which is used for the communication device to communicate with other devices, such as sending or receiving data and / or signals. Exemplarily, the communication interface can be a transceiver, circuit, bus, module or other type of communication interface.

[0044] In a fifth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium is used to store a computer program or instruction, which, when executed, enables the method shown in the first aspect or the second aspect and any possible implementation thereof to be implemented.

[0045] According to a sixth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the method shown in the first aspect or the second aspect and any possible implementation thereof to be implemented.

[0046] In the seventh aspect, an embodiment of the present application also provides a communication device for executing the methods in the above-mentioned first aspect or second aspect and various possible implementations thereof.

[0047] In the eighth aspect, a chip system is provided, which includes a logic circuit (or understood as, the chip system includes a processor, the processor may include a logic circuit, etc.), and may also include an input and output interface. The input and output interface can be used to input messages, and may also be used to output messages. The input and output interfaces may be the same interface, that is, the same interface can realize both the sending function and the receiving function; or, the input and output interface includes an input interface and an output interface, the input interface is used to realize the receiving function, that is, for receiving messages; the output interface is used to realize the sending function, that is, for sending messages. The logic circuit can be used to perform operations other than the sending and receiving functions in the method shown in the first aspect or the second aspect and any possible implementation thereof; the logic circuit can also be used to transmit messages to the input and output interface, or to receive messages from other communication devices from the input and output interface. The chip system can be used to implement the method shown in the first aspect or the second aspect and any possible implementation thereof. The chip system can be composed of chips, or it can include chips and other discrete devices.

[0048] Optionally, the chip system may further include a memory, which may be used to store instructions, and the logic circuit may call the instructions stored in the memory to implement corresponding functions.

[0049] In a ninth aspect, a communication system is provided, which may include a first communication device and a second communication device, the first communication device may be used to execute the method as shown in the above-mentioned first aspect and any possible implementation thereof, and the second communication device may be used to execute the method as shown in the above-mentioned second aspect and any possible implementation thereof.

[0050] The technical effects brought about by the second to ninth aspects above can be found in the description of the first aspect above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic diagram of the architecture of a wireless communication system provided in an embodiment of the present application;

[0052] Figure 2 A schematic diagram of the architecture of another wireless communication system provided in an embodiment of the present application;

[0053] Figure 3A schematic diagram of the architecture of another wireless communication system provided in an embodiment of the present application;

[0054] Figure 4 A schematic diagram of the architecture of another wireless communication system provided in an embodiment of the present application;

[0055] Figure 5 A flow chart of a communication method provided in an embodiment of the present application;

[0056] Figure 6 A schematic diagram of a channel at a specific location provided in an embodiment of the present application;

[0057] Figure 7 A flowchart of another communication method provided in an embodiment of the present application;

[0058] Figure 8 A flowchart of another communication method provided in an embodiment of the present application;

[0059] Fig. 9 A flowchart of another communication method provided in an embodiment of the present application;

[0060] Fig.10 A flowchart of another communication method provided in an embodiment of the present application;

[0061] Fig.11 A flowchart of another communication method provided in an embodiment of the present application;

[0062] Fig.12 A flowchart of another communication method provided in an embodiment of the present application;

[0063] Fig.13 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0064] Fig.14 A schematic diagram of the structure of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0065] Figure 1 FIG. 1 is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application. Figure 1 As shown, the communication system includes a wireless access network 100 and a core network 200. Optionally, the communication system 1000 may also include the Internet 300. The wireless access network 100 may include at least one wireless access network device (such as Figure 1 110a and 110b), and may further include at least one terminal (such as Figure 1120a-120j in the figure). The terminal is connected to the wireless access network device by wireless means, and the wireless access network device is connected to the core network by wireless or wired means. The core network device and the wireless access network device can be independent and different physical devices, or the functions of the core network device and the logical functions of the wireless access network device can be integrated on the same physical device, or part of the functions of the core network device and part of the functions of the wireless access network device can be integrated on one physical device. Terminals and wireless access network devices can be connected to each other by wired or wireless means. Figure 1 This is just a schematic diagram. The communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices. Figure 1 Not drawn in.

[0066] Radio access network equipment is an access device that a terminal uses to access a communication system wirelessly. Radio access network equipment can be a base station, an evolved NodeB (eNodeB), a long-term evolution (LTE), a next-generation NodeB (gNB) in a fifth-generation (5G) mobile communication system, or a next-generation RAN (NG-RAN), a next-generation base station in a sixth-generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system; it can also be a module or unit that completes some of the functions of a base station, for example, a centralized unit (CU) or a distributed unit (DU). The CU here completes the functions of the base station's radio resource control protocol and packet data convergence protocol (PDCP), and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the base station's radio link control layer and medium access control (MAC) layer, and can also complete part of the physical layer or all of the physical layer. For detailed descriptions of the above-mentioned protocol layers, please refer to the relevant technical specifications of the 3rd Generation Partnership Project (3GPP). The wireless access network equipment can be a macro base station (such as Figure 1 110a), or a micro base station or an indoor station (such as Figure 1110b), it can also be a relay node or a donor node, a transmission point (TP), a transmission and reception point (TRP), a transmission measurement function (TMF) wearable device or a vehicle-mounted device, etc. The wireless access network device can also be an integrated access and backhaul (IAB) node. The embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device. For example, the access network device can be applied to point-to-point transmission between the access network device and the UE or between the UE and the UE, multi-hop or relay transmission between the base station and the UE, dual connectivity (DC) or multi-connection between multiple base stations and the UE, and the present application can also be applied to uplink, downlink, access link, backhaul link, sidelink and other transmission scenarios. For the convenience of description, the network device is referred to as the abbreviation of the wireless access network device, and the base station is taken as an example of the wireless access network device.

[0067] Because the embodiments of the present application mainly involve access network devices, in the following text, unless otherwise specified, the network devices referred to are all access network devices. In the following text, a base station may be used to represent a network device and / or an access network device.

[0068] A terminal is a device with wireless transceiver functions, which can send signals to a base station or receive signals from a base station. A terminal can also be called a terminal device, user equipment (UE), mobile station, mobile station (MS), mobile terminal, subscriber unit, cellular phone, smart phone, wireless data card, personal digital assistant (PDA) computer, tablet computer, wireless modem, handheld device (handset), laptop computer, machine type communication (MTC) terminal, etc. Terminals can be widely used in various scenarios, such as device-to-device (D2D), V2X communication, MTC, Internet of things (IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal may also be a telematics box (TBOX), a machine-to-machine / machine-type communications (M2M / MTC) terminal device, an IoT terminal device, a mobile phone, a computer with wireless transceiver function, a wearable device, a vehicle, an airplane, a ship, a robot, a robotic arm, a smart home device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal.

[0069] As an example but not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable devices may also be referred to as wearable smart devices or smart wearable devices, etc., which are a general term for the application of wearable technology to intelligently design and develop wearable devices for daily wear, such as glasses, gloves, watches, clothing and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also powerful functions achieved through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-size, and independent of smartphones to achieve complete or partial functions, such as smart watches or smart glasses, etc., as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various types of smart bracelets, smart helmets, and smart jewelry for vital sign monitoring.

[0070] The various terminal devices introduced above, if located on a vehicle, such as placed in a vehicle or installed in a vehicle, can be considered as vehicle-mounted terminal devices, which are also called on-board units (OBU).

[0071] In the embodiment of the present application, the terminal device may also include a relay. Alternatively, it can be understood that anything that can communicate data with the base station can be regarded as a terminal device.

[0072] In an embodiment of the present application, proximity communication (PC)5 interface communication is supported between terminal devices, that is, transmission through a side link is supported. It can be understood that the PC5 interface includes an NR-based PC5 (NR-PC5) interface and an LTE-based PC5 (LTE-PC5) interface. The transmission link in the PC5 interface is defined as a side link. Enabling SL communication in unlicensed frequency bands in a local space is an important evolutionary direction, and the corresponding protocol technologies can be collectively referred to as sidelink-unlicensed (SL-U).

[0073] Base stations and terminals can be fixed or movable. Base stations and terminals can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on the water surface; they can also be deployed on airplanes, balloons, and artificial satellites. The embodiments of this application do not limit the application scenarios of base stations and terminals.

[0074] The roles of the base station and the terminal can be relative, for example, Figure 1 The helicopter or drone 120i in the figure can be configured as a mobile base station. For the terminal 120j that accesses the wireless access network 100 through 120i, the terminal 120i is a base station; but for the base station 110a, 120i is a terminal, that is, 110a and 120i communicate through the wireless air interface protocol. Of course, 110a and 120i can also communicate through the interface protocol between base stations. In this case, relative to 110a, 120i is also a base station. Therefore, base stations and terminals can be collectively referred to as communication devices. Figure 1 110a and 110b in the figure may be referred to as communication devices having base station functions. Figure 1 120a-120j in the figure can be called communication devices with terminal functions.

[0075] Base stations and terminals, base stations and base stations, and terminals and terminals can communicate through authorized spectrum, unauthorized spectrum, or both; they can communicate through spectrum below 6 GHz, spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0076] In the embodiments of the present application, the functions of the base station may also be performed by a module (such as a chip) in the base station, or by a control subsystem including the base station function. The control subsystem including the base station function here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, smart transportation, and smart city. The functions of the terminal may also be performed by a module (such as a chip or a modem) in the terminal, or by a device including the terminal function.

[0077] A network device in V2X technology is a road side unit (RSU). RSU can be a fixed infrastructure entity that supports V2X applications and can exchange messages with other entities that support V2X applications through the PC5 air interface. In addition, the terminal can also include a communication device in a future communication system such as the Metaverse. Optionally, the RSU can also be regarded as a terminal.

[0078] In this application, sidelink communication refers to communication between terminals via a sidelink, which can be applied to scenarios such as V2X and proximity services (ProSe).

[0079] The sidelink communication is explained below by taking V2X communication as an example, wherein the executors here take the first terminal device and the second terminal device as an example.

[0080] V2X communication is aimed at high-speed equipment represented by vehicles, and is a basic technology and key technology for applications in scenarios with very high communication latency requirements in the future. The application areas of V2X communication include smart cars, autonomous driving, and intelligent transportation systems. Typical V2X communication scenarios include vehicle-to-vehicle communication (V2V), vehicle-to-pedestrian communication (V2P), vehicle-to-infrastructure communication (V2I), or vehicle-to-network communication (V2N). For V2V communication, the first terminal device and / or the second terminal device may be a vehicle or a vehicle-mounted terminal device located in a vehicle. For example, for V2P communication, one of the first terminal device and the second terminal device may be a vehicle or a vehicle-mounted terminal device located in a vehicle, and the other may be a terminal device carried by pedestrians, such as a mobile terminal or a wearable device. For V2P communication, one of the first terminal device and the second terminal device may be a vehicle or a vehicle-mounted terminal device located in a vehicle, and the other may be an infrastructure such as an RSU. For V2N communication, one of the first terminal device and the second terminal device may be a vehicle or a vehicle-mounted terminal device located in the vehicle, etc., and the other may be a base station.

[0081] Taking the second terminal device as the sending node of the sidelink information as an example, based on V2X communication, the second terminal device can send its own position, speed and other status information, or driving intention information such as turning, merging or reversing, or information triggered by periodic or non-periodic events as sidelink data to the surrounding terminal devices. Similarly, the second terminal device can also receive sidelink data from other terminal devices around it. In addition, the second terminal device can also forward the sidelink data it has received from other terminal devices. Exemplarily, the sidelink data can be carried on the PSSCH. The sidelink feedback information can be carried on the physical sidelink feedback channel (PSFCH).

[0082] V2X communication can support communication scenarios with and without network coverage. Figure 2 In the scenario where the first terminal device shown by numbers a and b has network coverage, the resource allocation method when the first terminal device sends through V2X communication can adopt the network device scheduling mode. For example, the resources used by the terminal device sending through network device scheduling for sidelink communication can be called authorized resources or authorized frequency bands. Figure 2In the scenario where the first terminal device shown by number c has no network coverage, or when there is network coverage but the first terminal device does not adopt the network equipment scheduling mode, the first terminal device can select resources by itself, that is, select resources for sidelink communication from the resource pool, which can be called unlicensed resources or unlicensed frequency bands. It should be understood that the resources in this application can be replaced by time-frequency resources, and / or time-frequency code resources. In this application, time-frequency resources include time domain resources and / or frequency domain resources. Time-frequency code resources include at least one of time domain resources, frequency domain resources and code domain resources.

[0083] Under network coverage, the terminal device can obtain SL resource pool configuration information and / or SL bandwidth part (BWP) configuration information by receiving the system information block (SIB) of the network equipment, the cell-specific radio resource control (RRC) signaling or the terminal device user-level (UE-specific) RRC signaling. The terminal device can also use pre-configured SL resource pool configuration information or SL BWP configuration information, for example, when there is no network coverage, the pre-configured SL resource pool configuration information or SL BWP configuration information can be used. SL resource pool configuration information, for example, includes resource pool resource information, and the resource pool resource information is used to indicate the SL resource pool. The resource pool is a collection of time-frequency resources for sidelink communication between UEs. 3GPP also introduced a positioning-specific resource pool, that is, the time-frequency resource collection is dedicated to sending SL-PRS on the sidelink. Therefore, SL-PRS can pass through a communication resource pool or a positioning-specific resource pool. The resource pool may include code domain resources. The resources of the resource pool are used to include resources for the terminal device to send and receive at least one of the following physical channels, such as PSCCH, PSSCH, PSDCH, PSFCH, or physical sidelink broadcast channel (PSBCH), etc. Among them, the service types carried by PSSCH may include unicast, multicast and / or broadcast communication types. In the time domain of the SL resource pool, it includes one or more time units, and the time unit may be one or more symbols, one or more time slots, one or more mini-slots, one or more subframes, or one or more frames, etc. One or more time units may be continuous in time or discrete. It should be understood that the time domain units are logically continuous within a resource pool.

[0084] The SL resource pool configuration information may also include PSCCH configuration information, including the number of symbols occupied by the PSCCH in a time slot and the number of resource blocks (RBs) occupied by the PSCCH in a subchannel. The SL BWP configuration information may include SL resource pool information, which is used to configure the number of resource pools included in the BWP. The SLBWP configuration information may include SL bandwidth information, which is used to indicate the bandwidth size for SL communication, for example, indicating that the SL bandwidth is 20 megahertz (MHz).

[0085] The SL BWP configuration information may also include SL symbol information, which is used to indicate the starting SL symbol position on a time slot and the number of continuous SL symbols occupied. The SL BWP configuration information may also include SL subcarrier spacing and cyclic prefix information, which are used to indicate the subcarrier spacing and cyclic prefix used for SL communication. The cyclic prefix indicates an extended cyclic prefix or a normal cyclic prefix. In one possible configuration, the SL BWP configuration information may also include SL resource pool configuration information. In this application, unless the meaning of the time unit is specifically stated, it is described in terms of time slots, but the time unit is not limited to time slots only; unless the meaning of the time-frequency domain unit is specifically stated, it is described in terms of subchannels, but the frequency domain unit is not limited to subchannels only.

[0086] In the 5G NR system, the NR protocol technology in the unlicensed frequency band is collectively referred to as NR-U. The 3GPP organization hopes to further improve the air interface communication performance of the corresponding universal terminal equipment and network equipment interface (universal UE to network interface, Uu) through the NR user plane (NR user plane, NR-U). It can be understood that the Uu interface includes the NR-based Uu (NR-Uu) interface and the LTE-based Uu (LTE-Uu) interface.

[0087] In unlicensed frequency bands, transmitting terminal devices access signals in a competitive manner, for example, in accordance with the channel access method defined by the European Telecommunications Standards Institute (ETSI). The competitive access methods mainly include load based equipment (LBE) and frame based equipment (FBE).

[0088] For access to unlicensed frequency bands, both LBE and FBE require the terminal device to perform listen before talk (LBT). The LBT mechanism is essentially a channel access rule based on random back-off. Before accessing the channel and starting to send data, the UE needs to sense whether the channel is idle. If the channel has been idle for a certain period of time, it can occupy the channel. If the channel is not idle, it needs to wait for the channel to become idle again before it can occupy the channel. The reason why the LBT mechanism has become a mandatory feature of unlicensed frequency bands is that various regions of the world have regulations for the use of unlicensed frequency bands. Various forms of UE working in different communication protocols can only use unlicensed frequency bands if they meet the regulations, thereby using spectrum resources relatively fairly and efficiently.

[0089] In the unlicensed frequency band, a channel is generally allocated 20MHz bandwidth. When a device wants to transmit a signal on a bandwidth exceeding 20MHz, the device can access the channel on multiple channels. In this application, a channel is also called a sub-band or LBT bandwidth (LBT BWP) or RB set. RB set is a continuous number of RBs, excluding the interval between channels.

[0090] The LBT access method generally adopts energy-based detection and signal type detection. For NR-U, the LBT access method adopts energy-based detection. Energy-based detection requires setting a detection threshold (energy detection threshold). When the detected energy exceeds the detection threshold, it is judged that the channel is busy, and access to the channel is not allowed. When the detected energy is lower than the detection threshold, if it continues for more than a period of time, access to the channel is allowed. According to national and regional regulations on the use of unlicensed frequency bands, taking the 5GHz frequency band as an example, accessing a 20MHz channel requires meeting at least the minimum occupied channel bandwidth (occupied channel bandwidth, OCB) requirements before the channel can be occupied. Generally, the minimum OCB must be at least 80% of the normal bandwidth. Taking 20MHz as an example, at least 16MHz of bandwidth must be occupied to seize the 20MHz channel. In the application, the detected energy can be the reference signal received power (reference signal received power, RSRP), and accordingly, the detection threshold can be the RSRP threshold.

[0091] Terminal device or network equipment (the following types of LBT can be used:

[0092] (1) Type 1 LBT: A terminal device or network equipment needs to perform a random backoff before it can access the channel and send data.

[0093] Specifically, under type 1 LBT, the terminal device or network equipment can d ) after the channel is first sensed to be idle during a sensing slot duration of , and after the counter N in the following step 104 is zero, transmission is initiated. Specifically, the counter N is adjusted by sensing the channel to obtain an additional sensing slot duration according to the following steps:

[0094] Step 101, set N=N init , where N init For uniform distribution between 0 and CW p A random number between , execute step 104.

[0095] Step 102: If N>0, the terminal device or the network equipment chooses to decrement the counter, and sets N=N-1.

[0096] Step 103 , sense the channel to obtain an additional sensing time slot period. If the channel in the additional sensing time slot period is idle, go to step 104 ; otherwise, go to step 105 .

[0097] Step 104, if N=0, stop; otherwise, execute step 102.

[0098] Step 105, sensing the channel until another T d The channel is sensed to be busy or another T d All sensing time slots within are detected as channel idle.

[0099] Step 106, if in another T d If all the sensing time slots within the channel are detected as idle channels, execute step 104; otherwise, execute step 105.

[0100] In this application, T d Including duration T f = 16 microseconds (μs), followed by m p consecutive sensing time slots (denoted as T sl ), where T f including an idle sensing time slot period T at its beginning sl .

[0101] CW min,p ≤CW p ≤CW max,p For the competition window.

[0102] The terminal device or network equipment may select CW before step 101 of the above procedure. min,p and CW max,p .

[0103] m p , CW min,p and CW max,p It is based on the channel access priority level p associated with the terminal device or network equipment transmission, as shown in Table 1.

[0104]

[0105]

[0106] Table 1

[0107] The channel occupancy time of the terminal device or network equipment transmitting on the channel does not exceed T m cot,p , where the channel access procedure is performed based on a channel access priority level p associated with the terminal device or network equipment transmission.

[0108] The terminal device or network equipment may also maintain a contention window value CW p , and adjust CW according to the following steps before step 101 p The value of:

[0109] Step 106: for each priority class p∈{1,2,3,4}, set CW p =CW min,p .

[0110] Step 107: If at least 80% of the feedback hybrid automatic repeat request (HARQ) acknowledgment (ACK) values ​​corresponding to the data sent by the terminal device or network device in the reference subframe k are determined to be non-acknowledgement (NACK), the CW corresponding to each priority class p∈{1,2,3,4} is p The value is increased to the next higher allowed value and used in step 102; otherwise, step 101 is executed. The reference subframe k is the starting subframe of the most recent transmission of the terminal device or the network equipment on the channel.

[0111] (2) Type 2A LBT: A terminal device or network equipment using type 2A LBT can access the channel and send data after sensing that the channel is idle for at least 25 μs.

[0112] (3) Type 2B LBT: A terminal device or network equipment using type 2B LBT can access the channel and send data after sensing that the channel is idle for at least 16 μs.

[0113] (4) Type 2C LBT: A terminal device or network equipment using type 2C LBT does not need to sense the channel and can access the channel and send data after a transition interval of up to 584 μs within the COT.

[0114] Among them, type 2A LBT, type 2B LBT and type 2C LBT can be collectively referred to as type 2 LBT (type2LBT).

[0115] After accessing the channel through LBT, the transmitting terminal device can determine the time-frequency resources for sending data through resource selection.

[0116] In the present application, the channel access method for performing channel access in the unlicensed frequency band may be the above-mentioned type of LBT; however, the present application does not limit the use of other channel access methods permitted by the laws and regulations of other countries / regions for performing channel access in the unlicensed frequency band.

[0117] In the following, description is made by taking UE as an example of a terminal and a terminal device, and taking a base station as an example of an access network device.

[0118] The sidelink positioning technology performs SL-PRS measurements and other operations through communication between UEs to determine the location of the UE or the relative location and speed between UEs. The sidelink positioning scenario can be divided into a sidelink positioning process involving the network and a sidelink positioning process involving only the UE, depending on whether the positioning process involves the location management function (LMF). Regardless of the sidelink positioning process involving the network or the sidelink positioning process involving only the UE, the UE may need to send SL-PRS in the unlicensed spectrum to achieve positioning.

[0119] In this application, the sidelink positioning technology may also be referred to as ranging or SL positioning (ranging / SLpositioning). The result of ranging solution is mainly the distance (or relative distance) and / or angle (or relative angle) between two targets (such as UE).

[0120] The following are some technical terms involved in sidelink positioning:

[0121] A target UE refers to a UE whose position or direction and other information is to be determined through the sidelink positioning technology.

[0122] A reference UE refers to a UE used to support positioning of a target UE, and can send and / or receive a reference signal for positioning based on a sidelink, and / or provide positioning-related information.

[0123] A located UE refers to a reference UE whose location is known or can be known.

[0124] A server UE, or SL positioning server UE, or service UE, refers to a UE that provides functions such as determining a positioning method, sending positioning assistance data, or performing position calculation, etc. Among them, a target UE or a reference UE can serve as a server UE.

[0125] The client UE (client UE), generally a third-party UE, is used to initiate a sidelink positioning service request.

[0126] Anchor UE can be considered to be equivalent to a reference terminal.

[0127] Figure 3 and Figure 4 Possible side link positioning and applicable positioning architectures applicable to the present application are shown respectively. Figure 3 and Figure 4 The architecture shown includes a core network, an access network (such as NG-RAN) and a UE. The core network may include LMF, access and mobility management function (AMF). Optionally, the core network may also include network elements / modules such as a secure user plane location (SUPL) location platform (SLP) and / or an enhanced serving mobile location center (E-SMLC). Among them, the access network may include network elements or modules such as gNB and next generation 4G base station (NG-eNB).

[0128] Among them, LMF is a device or component deployed in the core network to provide positioning functions for UE. AMF is deployed in the core network control plane access point in the wireless core network, which can be used to meet the 5G standard and for the access and mobility management functions of the UE, and perform registration, connection, reachability, and mobility management; in addition, AMF can also be used to provide a session management message transmission channel for the UE and the session management function (SMF), and provide authentication and authorization functions for user access, so AMF can be used as a terminal and wireless core network control plane function. NG-eNB can be a device deployed in a wireless access network that meets the 4G standard to provide wireless communication functions for UE. eNB can include various forms of macro base stations, micro base stations (also called small stations), relay stations, access points, wearable devices, and vehicle-mounted equipment.

[0129] like Figure 3 As shown, UE a, UE b, UE c and UE d can be connected through a PC5 interface such as an NR PC5 interface. For example, UE a, UE b, UE c and UE d can perform sidelink communication through the NR PC5 interface to support the sidelink positioning process through the NR PC5 interface. UE a and UE b can also be connected to NG-RAN through a Uu interface (such as NR-Uu or LTE-Uu) respectively, and NG-RAN can be connected to AMF through a next generation control plane (NG-C) interface. Among them, the NG-C interface is a control plane interface between the access network and the core network. In addition, the interface between AMF and LMF can be an NL1 interface.

[0130] Another example Figure 4 As shown, NG-RAN may include gNB and NG-eNB. Among them, the Uu interface between gNB and UE may be an NR-Uu interface, and the interface between NG-eNB and UE may be an LTE-Uu interface. UE A, UE B, UE C and UE D may be connected to each other through a PC5 interface (such as an NR PC5 interface). It can be understood that Figure 4 Whether the NR PC5 interface between UE C and UE B exists, and whether the LTE-Uu interface between UE B and NG-eNB exists, is still under discussion (for further discussion, FFS), that is, these two interfaces may be optional. Figure 4 As shown, the interface between AMF and LMF can be an NLs interface.

[0131] Understandably, Figure 3 and Figure 4This is an exemplary description of the communication system to which the embodiments of the present application are applicable, and does not specifically limit the type, quantity, connection mode, etc. of the network elements included in the communication system to which the present application is applicable. Figure 3 and Figure 4 The network elements / modules indicated by the dotted lines are not indispensable but optional, for example, E-SMLC or SLP are not indispensable; or, the network elements / modules indicated by the dotted lines are in another form of existence, for example, gNB or NG-eNB are also called TRP in some embodiments, and the terminal device is called a SUPL enabled terminal (SET) in some embodiments.

[0132] Currently, the available unlicensed spectrum of 5GHz and 6GHz is defined at intervals of 20MHz, with a series of designated center frequencies defined, and a series of 20MHz channels are defined based on this center frequency. In other words, the current channel bandwidth is 20MHz. In some positioning scenarios, a bandwidth of 20MHz cannot support the needs of high-precision positioning. When a terminal wants to transmit a signal on a bandwidth exceeding 20MHz, it must perform LBT independently on each channel to be transmitted, and only send signals on channels where LBT succeeds. However, based on the LBT mechanism, if one or more channels are busy, the terminal needs to repeat channel sensing until multiple channels are idle before it can pass LBT, which will increase the transmission delay of the positioning reference signal, which may cause the positioning service to exceed the delay requirement and cause the sidelink positioning service to fail.

[0133] The present application provides a communication method for reasonably determining a channel access scheme according to positioning requirements and / or channel status information, so that the UE can adopt an appropriate channel access scheme to access the channel in an unlicensed spectrum scenario to send SL-PRS, thereby supporting positioning services in unlicensed spectrum scenarios to improve the reliability of positioning services in unlicensed spectrum scenarios. In the present application, access channel may refer to occupied channel resources. The executor of the method may be a terminal or a component applied to a terminal device, or a network device (such as a base station or a core network element such as an LMF) or a module applied to a network device. The following is combined with Figure 5 This method is introduced. Figure 5 In the example, the execution subject is the first UE. The first UE can be replaced by a terminal device, a terminal apparatus, a network device or a network apparatus as needed. The first UE can be used to Figure 5 In the method shown, the LBT measurement is determined and the LBT strategy is provided so that the device performing the LBT accesses the channel according to the LBT measurement. The device performing the LBT may be a UE (such as a second UE) or a base station, which is not specifically limited. In addition, the device performing the LBT may be the same as or different from the device transmitting the SL-PRS.

[0134] like Figure 5 As shown, the method may include the following steps:

[0135] S101: A first UE obtains quality of service information and / or channel status information of a positioning service.

[0136] The service quality information and the manner in which the first UE obtains the service quality information are described below.

[0137] The first UE may be a target terminal. The target terminal may be used to receive a sidelink positioning service request from a client terminal or its own application layer. The sidelink positioning service request may include service quality information.

[0138] In addition, if AMF or LMF is involved in the positioning process, the first UE can also obtain service quality information from the AMF or LMF.

[0139] Optionally, the first UE may also obtain the service quality information from other UEs, where the other UEs include, for example, a target UE or an anchor UE.

[0140] In the present application, in a sidelink positioning service such as ranging or SL positioning, the service quality information may include the QoS of the positioning service, such as location service (QoS). Specifically, the service quality information may include one or more of the type, accuracy or response time of the service quality.

[0141] (1) Types of QoS, or QoS levels, include best effort, multiple QoS classes, and assured class.

[0142] Among them, best effort is the least stringent QoS requirement. Under this service quality type, if the positioning result does not meet the QoS requirement, the positioning result is still returned, but the feedback carries an indication that the positioning result does not meet the expected QoS requirement.

[0143] The multiple QoS category is a medium-strict QoS requirement. Under this service quality type, multiple QoS requirements with different degrees of relaxation can be included, for example, at least the most stringent QoS and the most relaxed QoS. If the result of the position estimation does not meet the most stringent QoS, other positioning estimates may be triggered to try to meet less stringent QoS requirements until the most relaxed QoS requirements can be met. If the most relaxed QoS cannot be met, the position estimation result is discarded.

[0144] The guaranteed level is the most stringent QoS requirement. Under this service quality type, if the obtained position estimation result cannot meet the QoS requirement, it will be discarded.

[0145] (2) Accuracy or accuracy requirement, including horizontal accuracy requirement and vertical accuracy requirement. Horizontal accuracy requirement can be the positioning accuracy requirement for the horizontal direction, and vertical accuracy requirement can be the positioning accuracy requirement for the vertical direction. For example, for services such as positioning, route guidance and navigation, the horizontal accuracy requirement can be in the range of 10 meters to 50 meters. The vertical accuracy requirement can range from about three meters (for example, within the first floor of a building) to hundreds of meters.

[0146] In addition, the accuracy requirement may also include at least one of horizontal relative accuracy and vertical relative accuracy. The horizontal relative accuracy may be used to indicate the accuracy of the relative distance and / or relative angle in the horizontal direction. The vertical relative accuracy may be used to indicate the accuracy of the relative distance and / or relative angle in the vertical direction.

[0147] (3) Response time: It can also be called response time, which refers to requirements such as no delay, low delay or delay tolerance. Response time can be understood as the delay requirement for the sidelink positioning service, or can be understood as being related to the delay requirement.

[0148] Where no delay means that the server should immediately return any position estimate or dispatchable position it currently has. The location service (LCS) server should return the initial or last known position of the target terminal. If no positioning result or dispatchable position is available, the LCS server should return a failure indication and optionally start a procedure to obtain a position estimate or available position (for example, for later requests).

[0149] Low latency means that positioning feedback should prioritize response time requirements over accuracy requirements. The LCS server should return positioning results with minimal latency. The LCS should try to meet any accuracy requirements, but doing so should not add any additional latency, i.e., a fast response with lower accuracy is preferable to waiting for a more accurate response.

[0150] Delay tolerance means that the accuracy requirement of the positioning feedback is prioritized over the response time requirement. If necessary, the server should delay providing the response until the accuracy requirement of the requesting application is met. The LCS server should obtain the current position that meets the accuracy requirement.

[0151] (4) Range, that is, the scope of application of service quality information.

[0152] The above service quality types, horizontal accuracy requirements, vertical accuracy requirements and response time requirements may refer to the definitions in 3GPP related technical specifications (TS) 22.071.

[0153] The channel state information and the manner in which the first UE obtains the channel state information are described below.

[0154] In the present application, the channel status information can be used to indicate the busyness of the channel, or in other words, the first UE determines whether the current channel is easy to access based on the channel status information, that is, the channel status information can indicate the difficulty of channel access. Among them, the busier the channel, the more difficult it is to access the channel. For example, it can be used to indicate whether the channel is busy. For example, different channel busyness levels can also be defined for the channel busyness, representing different channel busyness levels. For example, the channel busyness level can include multiple levels such as channel idle and busy, and the busyness level can be further divided into different levels such as light busy and heavy busy.

[0155] Among them, the channel status information can be determined by the first UE based on previous LBT results. For example, the channel status information can be determined based on historical or previous communication processes. For example, the first UE triggers at least one LBT in one or more transmissions before S101. If at least N LBTs fail (failure) or multiple consecutive LBTs fail (or meet a certain number of failure thresholds), or, although the LBT is successful, the time or average time for performing LBT exceeds a certain time threshold, it means that the channel was busy before, and accordingly, the channel status information can indicate that the channel is busy. Among them, N can be a threshold for determining the channel busy level, and N is a positive integer. If the first UE's previous one or more LBTs did not fail, or less than N LBT results were failures, the channel status information can indicate that the channel is idle, that is, it indicates that the channel is not busy. If the first UE's previous at least N LBT results were failures, the channel status information can indicate that the channel is busy.

[0156] Furthermore, the first UE may also determine the channel status information based on the previous LBT results of the target resource pool. For example, the target resource pool may be a positioning dedicated resource pool, and the resources in the dedicated resource pool may be used to send SL-PRS. When at least one LBT result performed by the first UE in the target resource pool fails, or when the time or average time for the first UE to perform LBT in the target resource pool exceeds a certain time threshold, the channel status information corresponding to the target resource pool may be set to indicate that the channel of the target resource pool is busy.

[0157] It can be understood that in S101, the channel status information can also be determined by the UE after monitoring the channel according to the monitoring result of whether the channel is busy, that is, in S101, the UE can obtain the channel status information by sensing the channel. For example, the first UE can measure the current or continuous K sensing slots (sensing slots) in the target resource pool, where K is a positive integer. If the sensing result is, it means that the channel is not idle, and accordingly, the channel status information can indicate that the channel is busy.

[0158] In addition, the channel status information may also be determined by other UEs or base stations based on previous LBT results and sent to the first UE, which is not specifically limited in this application.

[0159] S102: The first UE determines LBT configuration information according to the service quality information and / or the channel status information, where the LBT configuration information is at least used to indicate a channel access scheme of the terminal.

[0160] In this application, the channel access scheme may also be referred to as the LBT scheme, channel access requirement or LBT requirement, etc. This application does not limit the specific name and can be used to indicate the way in which a UE accesses a channel under unlicensed spectrum. The channel access scheme will be described below in conjunction with the LBT configuration information.

[0161] Exemplarily, the LBT configuration information may include at least one of the following information:

[0162] (1) SL-PRS configuration information. The SL-PRS configuration information may be used to send the SL-PRS. For example, the SL-PRS configuration information includes the bandwidth of the SL-PRS, and may also include requirements for time domain, frequency domain and other resources for sending the SL-PRS.

[0163] (2) The number of access channels is M, where M is a positive integer greater than 1.

[0164] Among them, M is determined according to preset rules. For example, the M channels can be the minimum number of channels required to meet the QoS requirements of the positioning service determined according to the preset rules. For example, in some cases, when the SL-PRS for the positioning service is sent on less than M channels, the positioning result will not meet the QoS requirements. The M channels may also be channels where positioning reference signals are desired to be sent. Among them, the preset rules may be rules determined according to the configuration of the first UE itself, or rules determined according to the configuration provided by the LMF or other network devices. The meaning of M will be introduced in conjunction with the LBT scheme below.

[0165] Optionally, the M channels may be continuous or discontinuous channels in frequency, which is not specifically limited in the present application.

[0166] (3) Time information for executing listen-before-talk, or called time limit or timer. It means that before this time, the device executing LBT must perform corresponding actions according to the requirements of LBT, such as sending SL-PRS before this event or indicating LBT failure. Optionally, the failure indication can be carried in SLPP message, long term evolution positioning protocol (LPP), or MAC message or sidelink control information (SCI).

[0167] (4) Channel access scheme indication information, wherein the channel access scheme indication information is used to indicate the channel access scheme. Therefore, the LBT configuration information is used to indicate the channel access scheme, which can be understood as the channel access scheme indication information included in the LBT configuration information can be used to indicate the channel access scheme.

[0168] In the present application, the channel access scheme may be used to indicate the UE's requirement to access a channel on an unlicensed spectrum, and / or, to indicate the UE's requirement to send a positioning reference signal on an unlicensed spectrum. For example, the channel access scheme may be used to determine whether a terminal device must send SL-PRS on multiple consecutive channels, or to indicate whether a terminal device can perform listen-before-talk on a designated channel to send SL-PRS. It is understood that the present application does not limit the type of positioning reference signal, for example, the description is made using SL-PRS as an example.

[0169] As an example, the one or more channel access schemes indicated by the channel access scheme indication information may include one or more of a first channel access scheme, a second channel access scheme, and a third channel access scheme. Hereinafter, for the convenience of explanation, the first channel access scheme, the second channel access scheme, and the third channel access scheme are respectively referred to as a first LBT scheme, a second LBT scheme, and a third LBT scheme. Similarly, the LBT scheme hereinafter also refers to a channel access scheme.

[0170] The first LBT scheme, the second LBT scheme and the third LBT scheme are explained below.

[0171] a) The first LBT scheme requires the UE to access the channel when the monitoring results of M channels or RB sets are all idle, where M is a positive integer greater than 1. In this application, accessing the channel when the channel is idle means accessing the channel by LBT. The channel accessed by the UE is or includes the M channels or RB sets.

[0172] Optionally, if the LBT configuration information also includes a time limit, then according to the requirements of the first LBT scheme, before the time limit arrives, the device executing LBT needs to monitor M channels and the results show that the channels are all idle before it can access the channel and send SL-PRS; if the monitoring is not successful before the time limit, the positioning process fails due to LBT failure. Optionally, at this time, the device executing LBT can send information to the first UE to indicate that the LBT failed. Among them, whether the channel is idle can be determined by the UE through the perception of the channel during the LBT process.

[0173] b) The second LBT scheme requires the UE to access the channel and send SL-PRS when the monitoring results of at least N1 channels or RB sets are that the channel is idle. N1 may be (or not less than) the minimum number of idle channels for sending SL-PRS that meets the QoS requirements. The channel accessed by the UE may be or include the N1 channels or RB sets.

[0174] Optionally, the second LBT scheme may specifically require the UE to access the channel and send SL-PRS when the monitoring result of at least N1 channels or RB sets among the M channels or RB sets is that the channel is idle. Among them, the N1 channels may be part of the M channels, that is, N1 is a positive integer less than M, and M is a positive integer greater than 1. At this time, optionally, the channel access scheme indication information and / or the LBT configuration information may include the value of N1.

[0175] Optionally, the N1 channels or RB sets in the second LBT scheme are continuous channels or RB sets. And / or, the M channels or RB sets are continuous channels or RB sets.

[0176] If the type of quality of service is multiple QoS categories, N1 may be (or not less than) the minimum number of idle channels for sending SL-PRS required to meet the most relaxed QoS, and M is a positive integer greater than N1, for example, M is (or not less than) the minimum number of idle channels for sending SL-PRS required to meet the most stringent QoS or other non-most relaxed QoS. Optionally, the channel access scheme indication information and / or the LBT configuration information may include the value of M and the value of N1.

[0177] In this solution, if there is a time limit, the terminal can access the channel and send SL-PRS only when the monitoring result of at least N1 channels or RB sets is that the channel is idle before the time limit. In addition, in another equivalent indication method, the LBT configuration information can also indicate the value of N2. If the monitoring result of less than N2 channels or RB sets is that the channel is busy, the channel can be accessed. The implementation method can refer to the method of indicating N1 and will not be repeated.

[0178] In addition, in various embodiments of the present application, the LBT configuration information may also include information for indicating a channel or a RB set. For example, for the second LBT scheme, if the information indicates a channel, it means that at least N1 channels need to be monitored as idle; if the information indicates an RB set, it means that at least N1 RB sets need to be monitored as idle.

[0179] c) The third LBT solution requires the UE to access the channel at least when the channel or RB set at the specified position is idle. The channel accessed by the UE may be or include the channel or RB set at the specified position.

[0180] Exemplarily, the channel at the designated location may include one or more channels, wherein if there are multiple channels, the multiple channels may be continuous or discontinuous channels.

[0181] For example, the channel at the specified position may include one or more channels at the specified position among M consecutive channels, for example, including the first channel and / or the last channel of the M consecutive channels. Among them, the first channel may be the channel with the lowest frequency among the M channels, and the last channel may be the channel with the highest frequency among the M channels. At this time, the LBT configuration information may also carry a channel pattern or a channel pattern list for indicating the specified position; or, the LBT configuration information may also carry a bit sequence or a bitmap for indicating the specified position; or, the LBT configuration information may also include multiple bit sequences for indicating multiple specified positions. Figure 6 As shown, when M=4, the LBT configuration information may also carry a bit map

[1001] , indicating that the first and fourth channels among the four channels are designated positions, that is, the channels corresponding to the bits with a value of 1 are the channels at the designated positions; it is not excluded that the channels with a value of 0 are used to represent the channels at the designated positions in actual use.

[0182] Optionally, in the third LBT scheme, the first UE may also obtain indication information of a specified position, and the indication information may be used to indicate the position of the specified position in the M channels. The indication information may be included in the channel access scheme indication information and / or the LBT configuration information. Alternatively, the indication information may be predefined in the first UE, or may be indicated to the first UE by a network device through a preconfiguration method. In the present application, predefined may refer to predefined in configuration information such as factory configuration, or may refer to predefined by a communication standard or protocol. Preconfiguration may refer to configuration to the UE by the base station through information, messages or signaling such as RRC, MAC control element (CE) or downlink control information (DCI). For example, the base station may preconfigure multiple specified positions to the first UE, each specified position corresponds to an index identifier (ID), and the indication information may be the index ID.

[0183] It can be understood that the first LBT scheme is the most stringent LBT scheme, which can ensure the best positioning accuracy, but there may be a large positioning delay when the channel is busy. The second and third LBT schemes are less stringent than the first LBT scheme. It can be understood that the first LBT scheme is less lenient than the second LBT scheme, and the second LBT scheme is less lenient than the third LBT scheme.

[0184] The following describes a method for determining LBT configuration information based on service quality information.

[0185] Method 1, determining the LBT scheme according to the type of service quality. For example, the LBT scheme involved here can be any one or more of the three possible listen-before-talk access schemes introduced above: the first LBT scheme, the second LBT scheme, or the third LBT scheme. The following describes how to determine the LBT configuration information or the LBT scheme according to the service quality information and / or the channel information status.

[0186] As an example, when the type of the quality of service is a guaranteed level, the first UE may determine a first LBT scheme, that is, when the type of the quality of service is a guaranteed level, the device performing LBT may be enabled to access the channel through the first LBT scheme. At this time, the channel access scheme indication information may be used to indicate the first LBT scheme.

[0187] Among them, since the guarantee level is the most stringent QoS requirement, in order to ensure that the QoS of the positioning service under this type can be met, the UE can be required to access the channel and send SL-PRS after the monitoring results of M channels or RB sets are all idle, that is, the first LBT solution is adopted. At this time, M can be (or not less than) the minimum number of idle channels required to send SL-PRS that meets the QoS requirements.

[0188] As another example, when the type of the quality of service is a guaranteed level, or when the type of the quality of service is a multiple QoS category, the first UE may determine a second LBT scheme, that is, when the type of the quality of service is a guaranteed level or a multiple QoS category, the device performing LBT may be allowed to access the channel when the monitoring result of at least N1 channels or RB sets is that the channel is idle. At this time, the channel access scheme indication information may be used to indicate the second LBT scheme.

[0189] Wherein, if the type of the quality of service is a guaranteed level, N1 may be (or not less than) the minimum number of idle channels for sending SL-PRS that meets the QoS requirements, and M is a positive integer greater than N1. If the type of the quality of service is a multiple QoS category, N1 may be (or not less than) the minimum number of idle channels for sending SL-PRS required to meet the most relaxed QoS, and M is a positive integer greater than N1, for example, M is (or not less than) the minimum number of idle channels for sending SL-PRS required to meet the most stringent QoS or other non-most relaxed QoS.

[0190] Similarly, as another example, when the type of quality of service is a guaranteed level or multiple QoS categories, the device executing LBT can be allowed to access the channel when the monitoring result of no more than N2 channels or RB sets is that the channel is busy. If the type of quality of service is a guaranteed level, N2 is (or is not greater than) the maximum number of busy channels for sending SL-PRS that meet the QoS requirements. If the type of quality of service is multiple QoS categories, N2 is (or is not greater than) the minimum number of idle channels for sending SL-PRS required to meet the most relaxed QoS.

[0191] As another example, when the type of quality of service is a guaranteed level, or when the type of quality of service is multiple QoS categories, the first UE may determine a third LBT scheme, that is, when the type of quality of service is a guaranteed level or multiple QoS categories, the device executing LBT may be allowed to access the channel when at least N1 channels are idle. For example, the designated position includes at least the first channel and the last channel of the M channels when they are sorted in ascending order of frequency, and may also include one or more channels of the (M-2) channels in the first channel and the last channel. At this time, the channel access scheme indication information may be used to indicate the third LBT scheme.

[0192] The third LBT scheme can be understood as a more stringent requirement of the second LBT scheme, that is, not only the monitoring results on at least N1 channels are required to be idle, but also the N1 channels with idle monitoring results are required to include (or be) channels at specified positions. For example, if the type of quality of service is a guaranteed level, N1 can be (or not less than) the minimum number of idle channels for sending SL-PRS that meets the QoS requirements, and M is a positive integer greater than N1. If the type of quality of service is a multi-QoS category, N1 can be (or not less than) the minimum number of idle channels for sending SL-PRS required to meet the most relaxed QoS.

[0193] Method 2: The first UE determines the LBT scheme according to the response time, such as determining the first LBT scheme, the second LBT scheme or the third LBT scheme.

[0194] When the response time requirement in the service quality information is no delay, a more relaxed LBT scheme can be selected to meet the delay requirement. For example, at this time, the first UE can determine the second LBT scheme or the third LBT scheme.

[0195] When the response time requirement in the service quality information is low delay, a more relaxed LBT scheme can be selected to meet the delay requirement. For example, at this time, the first UE can determine the second LBT scheme or the third LBT scheme.

[0196] When the response time requirement in the service quality information is a delay tolerance, a more stringent LBT scheme can be selected to meet the positioning QoS requirements. For example, at this time, the first UE can determine the first LBT scheme or the second LBT scheme.

[0197] Method 3: The first UE determines the LBT scheme according to the accuracy, such as determining the first LBT scheme, the second LBT scheme or the third LBT scheme.

[0198] In method 3, the first UE may specifically determine the LBT scheme based on the accuracy requirement and / or the positioning method, wherein the positioning method may be related to the accuracy.

[0199] In the present application, the positioning method may include a positioning method based on SL-TDOA (which may be referred to as SL-TDOA for short), a positioning method based on SL-AoA (which may be referred to as SL-AoA for short), a positioning method based on SL-AoD (which may be referred to as SL-AoD for short), a positioning method based on single-sided RTT (which may be referred to as single-sided RTT for short), a positioning method based on multi-RTT (which may be referred to as multi-RTT for short), etc.

[0200] For example, if the first UE decides to use a time-based positioning method, such as SL-TDOA, based on accuracy requirements, the bandwidth requirements may be higher. The first UE can select a more stringent LBT solution to meet positioning QoS requirements. For example, the first UE can select the first LBT solution or the second LBT solution.

[0201] If the first UE decides to use an angle-based positioning method, such as SL-AoA, based on accuracy requirements, the bandwidth requirement may be lower, and the first UE may select a more relaxed LBT solution. For example, the first UE may select the second LBT solution or the third LBT solution.

[0202] It is understandable that the method of determining the positioning method according to the accuracy requirement does not belong to the limited content of this application. For example, the first UE can determine the positioning method according to the association between the accuracy requirement and the positioning method. In addition, the first UE can also use other existing methods to determine the positioning method. For example, the first UE can use the positioning method specified by the client terminal or LMF, or can use the default positioning method.

[0203] Method 4: The first UE determines the LBT scheme according to the channel information, such as the first LBT scheme, the second LBT scheme or the third LBT scheme.

[0204] As an example of method 4, if the channel status information indicates that the channel is not busy, or indicates that the channel is idle, the first UE can select a more stringent LBT scheme to meet the positioning QoS requirements. For example, the first UE can select the first LBT scheme or the second LBT scheme.

[0205] As another example of method 4, if the channel status information indicates that the channel is busy, the first UE may select a more relaxed LBT scheme, for example, the first UE may select the second LBT scheme or the third LBT scheme.

[0206] It can be understood that any multiple of the above methods 1 to 4 can be used in combination. For example, an example of combining methods 1 to 3 with method 4 is that if the channel status information indicates that the channel is busy, the first UE can determine a more relaxed LBT scheme based on methods 1 to 3. For example, according to method 1, when the type of service quality is the guarantee level, the first UE can determine the first LBT scheme, that is, adopt the most stringent LBT scheme, but if the channel status information indicates that the channel is busy, in order to reduce the delay of the positioning service, the first UE can select the second LBT scheme or the third LBT scheme. It can be understood that in the combination of method 4 with any of the methods 1 to 3, the final result is to reduce the possibility of LBT failure and thus positioning failure due to channel busyness, and to ensure that the service quality requirements of the current positioning service are met as much as possible.

[0207] It can also be understood that any LBT scheme including the first to third LBT schemes and the method of determining the LBT schemes introduced above can be applicable to various types of LBT including type 1 LBT and type 2 LBT.

[0208] S103: The first UE sends LBT configuration information.

[0209] Correspondingly, the device executing LBT can receive LBT configuration information and perform LBT according to the LBT configuration information.

[0210] Among them, if the device performing LBT is the same as the SL-PRS sending device, the device can also send SL-PRS through the channel after accessing the channel. If the device performing LBT is different from the SL-PRS sending device, for example, the device performing LBT is a base station, the SL-PRS sending device can also send SL-PRS in the resources indicated by the base station.

[0211] In the present application, the device performing LBT may be a second UE or a base station. The second UE may include one or more UEs other than the first UE. For example, when the first UE is a target terminal, the second UE may serve as an anchor terminal or a reference terminal. For another example, when the first UE is a server UE, the second UE may be a target UE or an anchor UE. The present application does not limit the UE type or name of the first UE and the second UE.

[0212] In addition, the SL-PRS sending device described here may be a UE other than the first UE.

[0213] Optionally, the first UE can also be used to receive the SL-PRS sent by the SL-PRS sending device and perform positioning measurements; in addition, other communication devices (such as target UE) can also receive the SL-PRS sent by the SL-PRS sending device and perform positioning measurements. The measurement data of the positioning measurement can be used to solve the location information of the positioning target. In the present application, the positioning target can be the first communication device, the second communication device, or it can be other communication devices or objects. For example, the measurement data can be used to solve the position of the first UE, or the relative position of the first UE and the second UE, or the distance and direction of the first UE and the second UE, and so on.

[0214] As an exemplary implementation, Figure 7 As shown, the first UE can receive SL-PRS as a target terminal and perform ranging or positioning. Figure 7The device performing LBT may be a second UE, and the second UE may be used as an anchor terminal to send SL-PRS. This embodiment may include the following steps:

[0215] S201: The first UE obtains a positioning service request from a client terminal or its own application layer.

[0216] The positioning service request may be a ranging or SL positioning service request.

[0217] As shown in S201 - a , the request may come from the client UE; as shown in S201 - a , the request may come from the application layer of the first UE.

[0218] S201 may be used as an example of the first UE obtaining the service quality information in S101. For example, the first UE may obtain the LCS QoS information from the positioning service request.

[0219] In addition, as an example of the first UE obtaining channel status information in S101, the first UE may obtain at least one previous LBT result after obtaining the positioning service request, and determine the channel status information based on the LBT result to determine whether the channel is busy. Alternatively, the first UE may monitor the channel after obtaining the positioning service request to determine whether the channel is busy. It can be understood that the way the first UE obtains the channel status information and / or the way the first UE determines whether the channel is busy can refer to the description in S101, and the repeated parts will not be repeated.

[0220] S202: The first UE determines LBT configuration information according to the service quality information, wherein the LBT configuration information may at least include channel access scheme indication information for indicating the LBT scheme.

[0221] It can be understood that the LBT configuration information can refer to the description in S102.

[0222] It can be understood that S202 can be used as an example of an implementation method of S102.

[0223] S203: The first UE sends LBT configuration information to the second UE. The second UE may include one or more UEs.

[0224] Correspondingly, the second UE receives LBT configuration information.

[0225] Exemplarily, the LBT configuration information may be carried in a SLPP message sent by the first UE to the second UE. The SLPP message is, for example, a provide assistance data message or a request location information message. The LBT configuration information may also be carried in other signaling messages, for example, via MAC layer signaling or via SCI.

[0226] It can be understood that S203 can be used as an example of an implementation method of S103.

[0227] S204: The second UE performs LBT according to the LBT configuration information.

[0228] Among them, the second UE can at least perform LBT according to the LBT scheme indicated by the channel access scheme indication information and access the channel.

[0229] For example, referring to the description of S103, the second UE may send the SL-PRS through one or more channels accessed by the second UE.

[0230] S205: The second UE sends SL-PRS.

[0231] S206: The first UE measures the SL-PRS sent by one or more second UEs. The measurement result may be referred to as measurement data, which may be used to locate the first UE, such as solving the position of the first UE, or the relative position of the first UE and the second UE, or the distance and direction between the first UE and the second UE, etc. Optionally, the first UE may send the measurement result to the second UE, or other UE other than the second UE, which calculates the ranging and / or positioning result and sends the ranging and / or positioning result to the first UE.

[0232] Subsequently, the first UE may provide the ranging and / or positioning result to the client UE or the application layer of the first UE.

[0233] It can be understood that in various embodiments of the present application, the measurement data obtained by the UE measuring the SL-PRS can be provided to a device or apparatus for determining the ranging and / or positioning results by calculation or solution. For example, when there is a server UE, the device or apparatus for determining the ranging and / or positioning results by calculation or solution can be a server UE, that is, the measurement data can be sent to the server UE by the anchor UE and / or the target UE. For another example, if there is no server UE, the target UE or the anchor UE can be used as a device or apparatus for determining the ranging and / or positioning results by calculation or solution, so the target UE or the anchor UE with corresponding computing capabilities can obtain the measurement data and calculate or solve to determine the ranging and / or positioning results. For example, in S206, the first UE can have the ability to determine the ranging and / or positioning results by calculation or solution, so the first UE can determine the ranging and / or positioning results after measuring the SL-PRS and obtaining the measurement data. For another example, if the first UE does not have the ability to determine the ranging and / or positioning results by calculation or solution, and the second UE has this ability, then in S206, the first UE can send the measurement data to the second UE, and the second UE can determine the ranging and / or positioning results by calculation or solution. In addition, if the network coverage is available, the ranging and / or positioning results can also be determined by the LMF. At this time, the first UE can send the measurement data to the LMF through the network, so that the LMF can calculate or solve the ranging and / or positioning results based on the measurement data.

[0234] It can be seen that in Figure 7 In the process shown, the target UE may determine the LBT configuration information to instruct the anchor UE or the reference UE to send the SL-PRS, and the target UE may perform ranging or positioning according to the SL-PRS.

[0235] As another exemplary implementation, Figure 8 As shown, the first UE can determine the LBT configuration information as a server UE. After determining the LBT configuration information, the first UE can send the LBT configuration information to the target UE and / or the anchor UE, so that the anchor UE uses the LBT scheme indicated by the LBT configuration information to access the channel, and the anchor UE sends the SL-PRS after accessing the channel. Optionally, the target UE can receive and measure the SL-PRS according to the transmission resources indicated by the LBT configuration information. It can be understood that Figure 8 In the description, it is taken as an example that the second UE is an anchor UE and the third UE is a target UE.

[0236] Understandably, Figure 8 S301 to S302 in the embodiment can be implemented with reference to S201 to S202, respectively. It can be understood that S302 can be used as an example of an implementation method of S102. Figure 8In S303, the first UE sends LBT configuration information, and accordingly, the second UE receives the LBT configuration information as an anchor UE. It can be understood that S303 can be used as an example of an implementation method of S103. Referring to S204 to S205, in S304 to S305, the second UE can perform LBT according to the LBT configuration information and send SL-PRS. In this embodiment, the second UE can also be a target UE, and the third UE can also be an anchor UE. Referring to S206, in S306, the third UE can perform positioning according to the SL-PRS sent by the second UE, obtain measurement data, or obtain ranging and / or positioning results. In addition, the third UE can also provide measurement data to the first UE or the second UE, or provide ranging and / or positioning results. Subsequently, the first UE can provide ranging and / or positioning results to the client UE or the application layer of the first UE.

[0237] As another exemplary implementation, Figure 8 The process shown can also be modified to a side link positioning process with the participation of LMF. For example, the action performed by the first UE is replaced by that performed by LMF. At this time, the client UE may not be required, and the positioning request may come from the UE (such as the target UE), or the AMF, or the LCS client. Among them, S301 can be replaced by the LMF obtaining a positioning service request. Therefore, the LMF may also determine the LBT configuration information based on the server quality information, and the LMF may send the LBT configuration information to the second UE, so that the anchor UE performs LBT according to the LBT configuration information, and sends the SL-PRS after accessing the channel. Optionally, the third UE may also perform positioning according to the SL-PRS sent by the second UE, obtain measurement data, or obtain ranging and / or positioning results. It can be understood that the way in which the LMF determines the LBT configuration information based on the server quality information can refer to the way in which the first UE determines the LBT configuration information in this application, and will not be repeated. In this embodiment, the second UE may also be the target UE, and the third UE may also be the anchor UE.

[0238] As another embodiment of the present application, the first UE may send SL-PRS according to the LBT configuration information after determining the LBT configuration information. Among them, the first UE may send SL-PRS according to the LBT scheme indicated by the LBT configuration information. Correspondingly, the fourth UE may perform positioning measurement based on the SL-PRS sent by the first UE. Exemplarily, at this time, the first UE may serve as a target UE, and the fourth UE may serve as an anchor UE or a reference UE.

[0239] It can be understood that S103 can be replaced by: the first UE sends SL-PRS according to the LBT configuration information, that is, the first UE may not send the LBT configuration information, or the upper layer of the first UE may indicate the LBT configuration information to the lower layer, so that the lower layer of the first UE performs LBT according to the LBT configuration information and sends SL-PRS. Among them, the lower layer of the first UE is, for example, the physical (PHY) layer; the upper layer of the first UE is, for example, the protocol layer above the physical layer, such as the medium access control (MAC) layer, the radio link control (RLC) layer, the adaptation layer between the PDCP layer, the radio resource control (RRC) or the application layer. In this scenario, the first UE can access the channel according to the LBT configuration and send SL-PRS. Other UEs other than the first UE, such as anchor UE (for example, the fourth UE), can measure the SL-PRS sent by the first UE, and the measurement results can be used to locate the first UE, such as solving the position of the first UE, or the relative position of the first UE and the fourth UE, or the distance and direction between the first UE and the fourth UE, etc.

[0240] In addition, as a non-alternative implementation of S103, the first UE may also send an additional SL-PRS based on S103. For example, in a multi-RTT scenario, both the first UE and the second UE may perform LBT based on the LBT access scheme indicated by the LBT configuration information, and send SL-PRS. Exemplarily, the first UE may serve as a target UE, and the second UE may serve as an anchor UE. It is understood that in a multi-RTT scenario, the target UE and the anchor UE may send SL-PRS respectively, and the target UE may receive the SL-PRS of the anchor UE to achieve positioning.

[0241] like Fig. 9 As shown, S401 to S403 can be implemented with reference to S201 to S203, respectively. It can be understood that S402 can be used as an example of an implementation method of S102, and in addition, S403 can be used as an example of an implementation method of S103. In S404, the first UE can perform LBT according to the LBT configuration information, and send SL-PRS after accessing the channel. In S405, the second UE can perform LBT according to the LBT configuration information after receiving the SL-PRS from the first UE, and send SL-PRS after accessing the channel. In S406, the first UE performs positioning according to the SL-PRS sent by the second UE to obtain ranging and / or positioning results. Subsequently, the first UE can provide ranging and / or positioning results to the client UE or the application layer of the first UE.

[0242] Optionally, the SL-PRS in step S404 may be sent in the form of COT shared information. The LBT configuration information in step S403 may also be carried in the COT shared information.

[0243] It can be understood that in a multi-RTT scenario, the first UE can use type 1LBT and / or type 2LBT access methods to perform LBT to access the channel; the second UE can use type 1LBT and / or type 2LBT access methods to perform LBT to access the channel.

[0244] As another exemplary implementation, Fig. 9 The process shown can also be modified to a side link positioning process involving a server UE or LMF. For example, the actions performed by the first UE in S402 and S403 are replaced by actions performed by the LMF. At this time, the client UE may not be required, and the positioning request may come from the UE (such as the target UE), or the AMF, or the LCS client. Among them, S401 can be replaced by the LMF obtaining a positioning service request. Therefore, the LMF may also determine the LBT configuration information based on the server quality information, and the LMF may send the LBT configuration information to the target UE (such as the first UE) and the anchor UE (such as the second UE here), so that the first UE and the second UE perform LBT according to the LBT configuration information, respectively, and send SL-PRS after accessing the channel. Optionally, after sending the SL-PRS, the first UE may also measure the SL-PRS sent by the second UE and perform positioning, obtain measurement data, or obtain ranging and / or positioning results. It can be understood that the way in which the server UE or LMF determines the LBT configuration information based on the server quality information can refer to the way in which the first UE determines the LBT configuration information in this application, and will not be repeated. In this embodiment, the second UE may also be a target UE, and the first UE may also be an anchor UE.

[0245] As another embodiment of the present application, if the device performing LBT is different from the device sending SL-PRS, the device performing LBT may also send COT sharing information after accessing the channel according to the LBT scheme indicated by the LBT configuration information, so that the device sending SL-PRS uses the channel successfully occupied by the device performing LBT to send SL-PRS. Among them, the SL-PRS sending device can access the channel through type 2LBT and use the channel resources shared by the base station. Among them, the COT sharing information may include channel information successfully accessed by the base station, such as frequency or channel number information. At this time, the device performing LBT may be a second UE or a base station, and the SL-PRS sending device (or anchor UE) may include a first UE.

[0246] like Fig.10As shown, taking the case where the device performing LBT is a base station and the device sending SL-PRS is the first UE as an example, the communication method of the present application may include the following steps: S501 to S502 may be implemented with reference to S201 to S202 respectively. It can be understood that S502 can be used as an example of an implementation method of S102. In S503, the first UE sends LBT configuration information to the base station. It can be understood that S503 can be used as an example of an implementation method of S103. In S504, the base station performs channel access according to the LBT configuration information and obtains COT sharing information. Among them, the COT sharing information may include resource information successfully occupied by the base station, such as channel indication information such as the index of the channel accessed by the base station. In S505, the base station indicates to the first UE the resource or channel information for sending the SL-PRS. For example, the resource or channel information of the SL-PRS may be carried in the COT sharing information. In S506, the first UE sends the SL-PRS according to the SL-PRS resource or channel information indicated by the base station. For example, the first UE can access the channel through type 2LBT according to the COT sharing information and send the SL-PRS. In S507, the fourth UE can perform positioning according to the SL-PRS sent by the first UE, obtain measurement data, or obtain ranging and / or positioning results.

[0247] Understandably, Fig.10 In the process, other UEs other than the first UE may also serve as SL-PRS sending devices (or anchor UEs) to receive the COT shared information sent by the base station through S505, and access the channel and send SL-PRS according to the COT shared information. At this time, the first UE may serve as the target UE to receive the SL-PRS for positioning measurement.

[0248] Optional, above Figures 7 to 10 In the illustrated embodiment, the manner in which the first UE obtains the positioning service request is also replaced by: the first UE receives an SLPP message or an LPP message from the LMF, wherein the SLPP message or the LPP message may carry LCS QoS information. Therefore, in the positioning scenario in which the LMF participates, the LMF may provide the quality of service information.

[0249] Understandably, the above Figures 7 to 10 The illustrated embodiment may be applied to a sidelink positioning procedure in which only the UE participates, or may be applied to a sidelink positioning procedure in which the LMF participates.

[0250] like Fig.11 As shown, in various embodiments of the present application, the sidelink positioning process in which only the UE participates may include the following processes:

[0251] S601: UE1 obtains a ranging or SL positioning service request, wherein, as shown in S601-a, the request may come from the client UE; as shown in S601-a, the request may come from the application layer of UE1. UE1 may be the target UE. For example, when Figure 5 , Figures 7 to 11 When the first UE in any embodiment serves as the target UE, UE1 here may be the first UE.

[0252] S602: UE1 discovers anchor UEs. For example, UE1 can discover anchor UEs such as UE2, UE3, ..., UEn through a discovery process.

[0253] S603: UE1 decides to execute the sidelink positioning procedure in which only UE participates. For example, if UE2, UE3, ..., UEn are not within the coverage of the base station, or if the network does not support the execution of the sidelink positioning procedure, UE1 may decide to execute the sidelink positioning procedure in which only UE participates, that is, continue to execute S604.

[0254] S604: UE1 exchanges capabilities with anchor UEs such as UE2, UE3, ..., and UEn.

[0255] S605: If UE1 does not support the sidelink positioning server (SL positioning server) function, UE1 discovers and selects a server UE.

[0256] The server UE may be an anchor UE or another UE.

[0257] S606: Auxiliary data (or called auxiliary information) are exchanged between anchor UEs such as UE1, UE2, UE3, ..., UEn and the server UE.

[0258] The auxiliary data may be used to assist the UE in acquiring measurement data, or to determine ranging or SL positioning results.

[0259] S607: SL-PRS-based measurements are performed between UE1 and anchor UEs such as UE2, UE3, ..., UEn, and UE1 obtains SL-PRS-based measurement data, or ranging or SL positioning results.

[0260] The measurement may be performed by UE1 or other UEs, and the measurement data or ranging or SL positioning results may be provided to UE1. In addition, other anchor UEs or server UEs other than UE1 may receive the measurement data and calculate ranging or SL positioning results.

[0261] S608: Feedback of ranging or SL positioning result. Taking UE feedback as an example, as shown in S608-a, UE1 may send the ranging or SL positioning result to the client UE; as shown in S608-b, UE1 may send the ranging or SL positioning result to the application layer of UE1.

[0262] like Fig.12 As shown, in various embodiments of the present application, the side link positioning process in which the LMF participates may include the following processes:

[0263] S701 may be implemented with reference to S602. Therefore, UE1 as the target UE may discover anchor UEs, such as UE2, UE3, ..., UEn, through the discovery process.

[0264] S702: LMF obtains capability information of UE1, UE2, UE3, ..., UEn, etc. For example, LMF may send capability request messages to UE1, UE2, UE3, ..., UEn, etc., and receive capability response messages sent by UEs carrying capability information. For another example, UE1, UE2, UE3, ..., UEn, etc. may report UE capability information to AMF via uplink non-access-stratum (NAS) transmission (ULNAS transport), and then AMF sends UE capability information to LMF.

[0265] Among them, the capability information may be related to ranging or sidelink positioning services.

[0266] S703: The LMF and the UE exchange auxiliary information. For example, the LMF provides auxiliary data to UE1, and then UE1 can send the auxiliary data received from the LMF to anchor UEs such as UE2, UE3, ..., UEn.

[0267] S704: LMF sends a request location information message to UE1.

[0268] Optionally, the location information request message may carry service quality information, such as LCS QoS. Therefore, S704 may be used as an example of an implementation manner in which the first UE obtains the service quality information in S101.

[0269] S705: SL-PRS-based measurements are performed between UE1 and anchor UEs such as UE2, UE3, ..., and UEn.

[0270] S706: UE1 feeds back positioning information to LMF.

[0271] Among them, if LMF decides to perform UE-based positioning, the positioning indication can be carried in the request location information message in S704 to instruct UE1 and / or the anchor UE to perform positioning calculations and obtain ranging or SL positioning results. At this time, the positioning information fed back by UE1 to LMF in S706 can be ranging or SL positioning results. If LMF decides to perform LMF-based positioning, UE1 and / or the anchor UE performs positioning measurements, and the positioning information fed back by UE1 to LMF in S706 can be measurement data based on SL-PRS, and LMF can subsequently obtain ranging or SL positioning results based on the measurement data.

[0272] Understandably, the above Figures 7 to 11 In each of the embodiments shown, the discovery process between the target UE, the anchor UE and the target UE can refer to Fig.11 and Fig.12 Implementation as described in .

[0273] It can be understood that any one of the first UE, the second UE, the third UE, the fourth UE, the anchor UE, the target UE, the server UE, the reference UE and the like involved in the above embodiments can be used as Figure 3 UE a, UE b, UE c or UEd in the architecture, or as Figure 4 Any UE among UE A, UE B, UE C or UE D in the architecture. In addition, the base station involved in each of the above embodiments can be used as Figure 3 The base station in the NG-RAN architecture, or as Figure 4 Base stations in NG-RAN.

[0274] It is understandable that, in order to implement the functions in the above embodiments, the base station and the terminal include hardware structures and / or software modules corresponding to the execution of each function. It should be easily appreciated by those skilled in the art that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application scenario and design constraints of the technical solution.

[0275] Fig.13 and Fig.14 The following is a schematic diagram of the structure of possible communication devices provided in the embodiments of the present application. These communication devices can be used to implement the functions of the terminal or base station in the above method embodiments, and thus can also achieve the beneficial effects of the above method embodiments. In the embodiments of the present application, the communication device can be as follows: Figure 1 One of the terminals 120a-120j shown may also be Figure 1 The base station 110a or 110b shown may also be a module (such as a chip) applied to a terminal or a base station.

[0276] like Fig.13 As shown, the communication device 1300 includes a processing unit 1310 and a transceiver unit 1320. The communication device 1300 is used to implement the above Figure 5 or Figures 7 to 11 The functions of the UE or base station in the method embodiments shown in any one of the embodiments.

[0277] When the communication device 1300 is used to implement Figure 5 The functions of the first UE (or first communication device) in the method embodiment shown are: the processing unit 1310 is used to obtain service quality information and / or channel status information, and determine LBT configuration information according to the service quality information and / or channel status information. The transceiver unit 1320 can be used to send LBT configuration information.

[0278] When the communication device 1300 is used to implement Figure 5 When the function of the device (or second communication device) performing LBT in the method embodiment shown is as follows: the transceiver unit 1320 can be used to receive LBT configuration information, perform LBT according to the LBT configuration information, and send SL-PRS.

[0279] For more detailed description of the processing unit 1310 and the transceiver unit 1320, please refer to Figure 5 or Figures 7 to 11 The method embodiments shown in any of the embodiments are described in detail.

[0280] like Fig.14 As shown, the communication device 1400 includes a processor 1410 and an interface circuit 1420. The processor 1410 and the interface circuit 1420 are coupled to each other. It can be understood that the interface circuit 1420 can be a transceiver or an input-output interface. Among them, the transceiver may include a transmitter and / or a receiver, and the transmitter and the receiver may perform a transmitting operation and a receiving operation respectively. Optionally, the communication device 1400 may also include a memory 1430 for storing instructions executed by the processor 1410 or storing input data required by the processor 1410 to execute instructions or storing data generated after the processor 1410 executes instructions.

[0281] When the communication device 1400 is used to implement Figure 5 or Figures 7 to 11 When the method shown in any of the embodiments is implemented, the processor 1410 is used to implement the function of the above-mentioned processing unit 1310, and the interface circuit 1420 is used to implement the function of the above-mentioned transceiver unit 1320.

[0282] When the above communication device is a chip applied to UE, the UE chip implements the functions of the UE in the above method embodiment. The UE chip receives information sent by the base station to the UE through other modules in the UE (such as a radio frequency module or an antenna); or the UE chip sends information to other modules in the UE (such as a radio frequency module or an antenna), and the information is sent by the UE to the base station.

[0283] When the above-mentioned communication device is a module applied to a base station, the base station module implements the functions of the base station in the above-mentioned method embodiment. The base station module receives information from other modules in the base station (such as a radio frequency module or an antenna), and the information is sent by the UE to the base station; or, the base station module sends information to other modules in the base station (such as a radio frequency module or an antenna), and the information is sent by the base station to the UE. The base station module here can be a baseband chip of a base station, or a CU, DU or other module, or a device under an open radio access network (O-RAN) architecture, such as an open CU, an open DU and other devices.

[0284] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0285] The method steps in the embodiments of the present application can be implemented in hardware or in software instructions that can be executed by a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, mobile hard disks, compact disc read-only memory (CD-ROM) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or a UE. The processor and the storage medium can also be present in a base station or a UE as discrete components.

[0286] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instruction is loaded and executed on a computer, the process or function described in the embodiment of the present application is executed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device or other programmable device. The computer program or instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instruction may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center by wired or wireless means. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server, data center, etc. that integrates one or more available media. The available medium may be a magnetic medium, for example, a floppy disk, a hard disk, a tape; it may also be an optical medium, for example, a digital video disc; it may also be a semiconductor medium, for example, a solid-state hard disk. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0287] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0288] An embodiment of the present application also provides a computer-readable storage medium storing a computer program, wherein the computer program includes instructions for executing the above method embodiment.

[0289] The embodiment of the present application also provides a computer program product including instructions, which, when executed on a computer, enables the computer to execute the above method embodiment.

[0290] The present application also provides a communication system, which may include a first communication device and a second communication device, for implementing Figure 5 or Figures 7 to 11 Any embodiment or Figure 6 For example, Figure 5 In the method shown, the first communication device may be a first UE, and the second communication device may be a device that performs LBT, such as a second UE. Figures 7 to 9 In the process shown in FIG. 1 , the first communication device may be a first UE, and the second communication device may be a second UE. Fig.10 In the process shown, the first communication device may be a first UE, and the second communication device may be a base station.

[0291] In the present application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of the present application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship; in the formula of the present application, the character " / " indicates that the previous and next associated objects are in a "division" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0292] It is understood that the various numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.

[0293] The technical solution provided in the embodiment of the present application can be applied to wireless communication between communication devices. Wireless communication between communication devices may include: wireless communication between network devices and terminals, wireless communication between network devices and network devices, and wireless communication between terminals. In the embodiment of the present application, the term "wireless communication" may also be referred to as "communication", and the term "communication" may also be described as "data transmission", "information transmission" or "transmission".

Claims

1. A communication method, characterized in that: include: Acquire quality of service information and / or channel status information of the positioning service, where the channel status information is used to indicate the busyness of the channel; Determine listen-before-talk LBT configuration information according to the quality of service information and / or the channel status information, where the LBT configuration information is used to indicate a channel access scheme of the terminal; Sending the LBT configuration information; and / or, Access a channel according to the LBT configuration information and send a second positioning reference signal through the channel, where n is a positive integer.

2. The method according to claim 1, characterized in that The LBT configuration information includes at least one of the following: Configuration information of positioning reference signals; Time information for executing LBT; Channel access scheme indication information, where the channel access scheme indication information is used to indicate the channel access scheme.

3. The method according to claim 1 or 2, characterized in that The channel access scheme includes at least one of a first channel access scheme, a second channel access scheme, and a third channel access scheme; The first channel access scheme requires accessing a channel when the monitoring results of M channels are all idle, where M is a positive integer greater than 1; The second channel access scheme requires accessing a channel when the monitoring results of at least N1 channels are all idle, where N1 is a positive integer greater than 1; The third channel access scheme requires accessing the channel at least when the channel at the designated position is idle.

4. The method according to claim 3, characterized in that The service quality information includes one or more of the following: type, accuracy or response time of the service quality.

5. The method according to claim 4, characterized in that When the type of the quality of service is a guaranteed level, the channel access scheme includes the first channel access scheme; or, When the type of the quality of service is a guaranteed level or multiple quality of service categories, the channel access scheme includes the second channel access scheme; or, When the type of the quality of service is a guaranteed level or multiple quality of service categories, the channel access scheme includes the third channel access scheme; or, When the channel status information indicates that the channel is busy, the channel access scheme includes the second channel access scheme or the third channel access scheme; or, When the channel state information indicates that the channel is not busy, the channel access scheme includes the first channel access scheme or the second channel access scheme.

6. The method according to any one of claims 3 to 5, characterized in that: The method further comprises: Obtain indication information of the specified location.

7. The method according to claim 2, characterized in that The LBT configuration information also includes a first indication, where the first indication is used to indicate that a positioning reference signal is sent on one or more channels whose monitoring result within the time indicated by the time information is that the channel is idle.

8. The method according to any one of claims 1 to 7, characterized in that: The method is applied to a first communication device, and the sending of the LBT configuration information comprises: The LBT configuration information is sent to a second communication device, where the configuration information is used for the second communication device to access a channel.

9. The method according to claim 8, characterized in that The method further comprises: The first positioning reference signal sent by the second communication device through the channel is measured to obtain measurement data, where the measurement data is used to obtain position information of a positioning target.

10. The method according to any one of claims 1 to 9, characterized in that: The LBT configuration information is carried in the channel occupancy time COT shared information; and / or, The LBT configuration information is carried in a Sidelink Positioning Protocol SLPP message.

11. A communication method, characterized in that: include: Receive LBT configuration information, where the LBT configuration information is used to indicate a channel access scheme of the terminal, where the LBT configuration information is determined based on quality of service information and / or channel status information of the positioning service, where the channel status information is used to indicate a busyness of the channel; Accessing a channel according to the LBT configuration information; A first positioning reference signal is sent through the channel.

12. The method according to claim 11, characterized in that The LBT configuration information includes at least one of the following: Configuration information of positioning reference signals; Time information for executing LBT; Channel access scheme indication information, where the channel access scheme indication information is used to indicate the channel access scheme.

13. The method according to claim 11 or 12, characterized in that The channel access scheme includes at least one of a first channel access scheme, a second channel access scheme, and a third channel access scheme; The first channel access scheme requires accessing a channel when the monitoring results of M channels are all idle, where M is a positive integer greater than 1; The second channel access scheme requires accessing a channel when the monitoring results of at least N1 channels are all idle, where N1 is a positive integer greater than 1; The third channel access scheme requires accessing the channel at least when the channel at the designated position is idle.

14. The method according to claim 13, characterized in that The first information is the service quality information of the positioning service, including the type, accuracy or response time of the service quality.

15. The method according to claim 14, characterized in that When the type of the quality of service is a guaranteed level, the channel access scheme includes the first channel access scheme; or, When the type of the quality of service is a guaranteed level or multiple quality of service categories, the channel access scheme includes the second channel access scheme; or, When the type of the quality of service is a guaranteed level or multiple quality of service categories, the channel access scheme includes the third channel access scheme; or, When the channel status information indicates that the channel is busy, the channel access scheme includes the second channel access scheme or the third channel access scheme; or, When the channel state information indicates that the channel is not busy, the channel access scheme includes the first channel access scheme or the second channel access scheme.

16. The method according to any one of claims 13 to 15, characterized in that: The method further includes: acquiring indication information of the designated location.

17. The method according to claim 12, characterized in that The LBT configuration information further includes a first indication, where the first indication is used to indicate that one or more channels whose monitoring results within the time indicated by the time information are that the channel is idle send a positioning reference signal; The sending the first positioning reference signal within the time indicated by the time information includes: The first positioning reference signal is sent through one or more channels whose monitoring result within the time indicated by the time information is that the channel is idle.

18. The method according to any one of claims 11 to 17, characterized in that: The method is applied to a second communication device, and the method further includes: The second positioning reference signal sent by the first communication device is measured to obtain measurement data, where the measurement data is used to obtain position information of the positioning target.

19. The method according to any one of claims 11 to 18, characterized in that: The accessing a channel according to the LBT configuration information comprises: Access the channel through a type 1 listen-before-talk process or a type 2 listen-before-talk process according to the LBT configuration information.

20. The method according to any one of claims 11 to 19, characterized in that: The LBT configuration information is carried in the COT shared information; and / or, The LBT configuration information is carried in a Sidelink Positioning Protocol SLPP message.

21. A communication device, characterized in that: The method comprises a processor configured to execute a computer program or an instruction to implement the method according to any one of claims 1 to 20.

22. A communication device, characterized in that: Comprising modules for executing the method as claimed in any one of claims 1 to 20.

23. A computer-readable storage medium, characterized in that: The storage medium stores a computer program or an instruction. When the computer program or the instruction is executed by the communication device, the method according to any one of claims 1 to 20 is implemented.

Images