WO2024032285A1

WO2024032285A1 - Communication method and apparatus

Info

Publication number: WO2024032285A1
Application number: PCT/CN2023/105893
Authority: WO
Inventors: 李翔宇; 彭文杰
Original assignee: 华为技术有限公司
Priority date: 2022-08-08
Filing date: 2023-07-05
Publication date: 2024-02-15
Also published as: CN117596701A

Abstract

A communication method and apparatus. The method comprises: a first terminal device determines a first channel access priority class (CAPC) and then transmits, to a second terminal device, first information for indicating a second CAPC, wherein the second CAPC is the same as the first CAPC, or the second CAPC is determined on the basis of the first CAPC; and the second CAPC is used by the second terminal device to perform listen before talk (LBT) on a first physical sidelink feedback channel (PSFCH). According to the method, the second terminal device can perform LBT on a PSFCH on the basis of a CAPC indicated by the first terminal device, so that the CAPC transmitted by the PSFCH can be flexibly adapted to actual service communication requirements, and the communication quality of a sidelink unlicensed spectrum (SL-U) is improved.

Description

A communication method and device

Cross-references to related applications

This application claims priority to the Chinese patent application filed with the China Patent Office on August 8, 2022, with the application number 202210942139.2 and the application title "A communication method and device", the entire content of which is incorporated into this application by reference.

Technical field

The present application relates to the field of communication technology, and in particular, to a communication method and device.

Background technique

In a wireless communication system, data communication between terminal devices can be carried out through network equipment, or communication between terminal equipment can be carried out directly without the help of network equipment. The interface between terminal devices can be called the proximity-based services communication 5 (PC5) interface, which is similar to the Uu interface between terminal devices and network devices. The link between terminal equipment is called a sidelink (SL).

When network equipment and terminal equipment transmit on unlicensed spectrum, the terminal equipment and network equipment need to perform a listen before talk (LBT) process before sending data, that is, a channel access process. For example, for uplink hybrid automatic repeat request (HARQ) feedback, the terminal device will perform the LBT process.

In the sidelink on unlicensed spectrum (SL-U), when SL HARQ feedback is transmitted on the PSFCH, there is currently no clear method for the terminal equipment to perform the LBT process, which may affect the communication quality of SL-U.

Contents of the invention

This application provides a communication method and device to clarify how terminal equipment performs LBT in an SL-U scenario and improves the communication quality of SL-U.

In a first aspect, this application provides a communication method, which can be applied to a first terminal device, a functional module in the first terminal device, a processor or chip in the first terminal device, etc. Taking application to the first terminal device as an example, the method may include: after the first terminal device determines the first channel access priority class (CAPC), sending the first information to the second terminal device, the The first information is used to indicate the second CAPC. Wherein, the second CAPC is the same as the first CAPC, or the second CAPC is determined based on the first CAPC; the second CAPC is used for the second terminal device for the first physical sidelink The feedback channel (physical sidelink feedback channel, PSFCH) performs LBT.

Through the above method, the second terminal device can perform LBT on the PSFCH based on the CAPC indicated by the first terminal device, so that the CAPC transmitted by the PSFCH can be flexibly adapted to actual service communication requirements and improve the communication quality of the SL-U.

In a possible design, the first terminal device may determine the first CAPC in the following manner: the first terminal device receives first downlink control information (DCI) from a network device, and the The first DCI is used for scheduling SL resources, and the first DCI indicates the first CAPC. In this way, the first terminal device can determine the CAPC indicated by the first DCI as the first CAPC.

In a possible design, the first terminal device may determine the first CAPC in the following manner: the first terminal device may determine the first CAPC according to a first preset rule and a first transport block (TB). Describe the first CAPC. In this way, the first terminal device can determine the first CAPC based on the actual situation.

In a possible design, the first terminal device determines the first CAPC according to the first preset rule and the first TB. The method may be: when the first TB includes at least one media interface When a media access control control element (MAC CE) is entered, the first terminal device may determine that the first CAPC is the CAPC with the highest priority among the CAPCs corresponding to the at least one MAC CE; when the first CAPC is When a TB does not include the at least one MAC CE and includes at least one sidelink control channel service data unit (SCCH SDU), the first terminal device may determine the first The CAPC is the CAPC with the highest priority among the CAPCs corresponding to the at least one SCCH SDU; when the first TB does not include the at least one MAC CE and the at least one SCCH SDU, and includes at least one sidelink service sidelink traffic channel service data unit (STCH SDU), the first terminal device may The first CAPC is determined to be the CAPC with the lowest priority among the CAPCs corresponding to the at least one STCH SDU. Based on the above method, the first terminal device can determine the accurate first CAPC in combination with the first preset rule and the first TB.

In a possible design, the first terminal device determines the first CAPC according to the first preset rule and the first TB. The method may be: the first terminal device determines the first CAPC. It is the CAPC with the highest priority among the CAPCs corresponding to at least one logical channel (LCH) and/or at least one MAC CE included in the first TB. Based on the above method, the first terminal device can determine the accurate first CAPC in combination with the first preset rule and the first TB, and the implementation complexity of this method is low.

In a possible design, the first terminal device may determine the first CAPC in the following manner: the first terminal device determines that the CAPC corresponding to the first LCH or the first MAC CE is the first CAPC, so The first LCH or the first MAC CE is used to trigger the first terminal device to select or reselect SL resources, and there is a corresponding relationship between the first LCH or the first MAC CE and the CAPC. Based on the above method, the first terminal device can determine the accurate first CAPC in combination with the logical channel or MAC CE that triggers SL resource selection or reselection.

In a possible design, the first information may include first indication information, and the first indication information is used to instruct the second CAPC to be used for PSFCH transmission. In this way, it is clear that the second CAPC is used for PSFCH transmission, so that the second terminal device performs LBT based on the second CAPC.

In a possible design, the format of the first information is a first format, and the first format may be used to indicate that the second CAPC is used for PSFCH transmission. In this way, the format of the first information indicates that the second CAPC is used for PSFCH transmission, which can save indication overhead.

In a second aspect, this application provides a communication method, which can be applied to a second terminal device, a functional module in the second terminal device, a processor or chip in the second terminal device, etc. Taking application to the second terminal device as an example, the method may include: the second terminal device receives first information from the first terminal device, the first information being used to indicate the second CAPC; subsequently, the second terminal device may LBT is performed on the first PSFCH according to the second CAPC.

In a possible design, the first PSFCH is determined based on the mapping relationship between a physical sidelink control channel (PSSCH) and the PSFCH, or the first PSFCH is indicated by the first terminal device. In this way, when the first PSFCH is determined based on the mapping relationship or the first terminal equipment indication, that is, when the determination of the PSFCH is related to the actual service communication, the second terminal equipment can perform LBT on the PSFCH based on the CAPC indicated by the first terminal equipment. This enables the CAPC transmitted by PSFCH to flexibly adapt to actual business communication needs and improve the communication quality of SL-U.

In a possible design, the second terminal device performs LBT for the first PSFCH according to the second CAPC. The method may be: the second terminal device determines the third CAPC according to the second CAPC, and then the The second terminal equipment performs LBT on the first PSFCH according to the third CAPC. In this way, the second terminal device can flexibly determine the required CAPC to perform LBT on the first PSFCH to flexibly adapt to actual business communication requirements and improve the communication quality of SL-U.

In a possible design, the second terminal device determines the third CAPC based on the second CAPC. The method may be: when the second terminal device determines that the second CAPC is less than or equal to the first threshold, The second terminal device determines the third CAPC; or, when the second terminal device determines that the second CAPC is greater than the first threshold, the second terminal device determines the third CAPC. In this way, the second terminal device can flexibly determine the required CAPC to perform LBT on the first PSFCH to flexibly adapt to actual business communication requirements and improve the communication quality of SL-U.

In a possible design, the second terminal device may determine a fourth CAPC based on the second CAPC, and then the second terminal device performs LBT for the second PSFCH based on the fourth CAPC. In this way, when the second terminal device performs LBT on multiple PSFCHs corresponding to one PSSCH, it can use different CAPCs to improve the reliability of PSFCH transmission, thereby improving the overall SL-U communication quality.

In a possible design, the second terminal device determines the fourth CAPC based on the second CAPC. The method may be: the second terminal device may subtract M from the second CAPC to obtain the fourth CAPC. CAPC, the M is an integer greater than or equal to 1. In this way, when the second terminal device performs LBT on multiple PSFCHs corresponding to one PSSCH, different CAPCs can be used, so that subsequent PSFCH executions of LBT use higher priority CAPCs, thereby improving the reliability of PSFCH transmission and thus improving the overall SL. -U communication quality.

In a possible design, the second terminal device receives second information, and the second information may be used to indicate that the fourth CAPC is determined based on the second CAPC, and the fourth CAPC is determined based on the fourth CAPC. The second PSFCH performs LBT. In this way, the second terminal device can determine whether to use different CAPCs for different PSFCHs based on the indication, so that when the same CAPC can be used, the power consumption of determining a new CAPC for each PSFCH transmission is saved.

In a third aspect, this application provides a communication method, which can be applied to a second terminal device, a functional module in the second terminal device, a processor or chip in the second terminal device, etc. Taking application to the second terminal device as an example, the method may include: the second terminal device receives sidelink control information (SCI) from the first terminal device, and then the second terminal device determines the SCI When CAPC is not indicated, LBT is performed on the first PSFCH according to the predefined CAPC.

Through the above method, the second terminal device performs LBT for PSFCH based on the predefined CAPC, so that the CAPC for PSFCH transmission does not need to adapt to actual business communication requirements in some cases, and a higher priority CAPC is used for PSFCH transmission. , thereby improving the communication quality of SL-U.

In a possible design, the first PSFCH may be determined by the second terminal equipment. In this way, when the first PSFCH is determined by the second terminal device, that is, when the determination of the PSFCH is not directly related to the actual service communication, the second terminal device performs LBT on the PSFCH based on the predefined CAPC, which can make the PSFCH transmission In some cases, CAPC does not need to adapt to actual business communication requirements, but uses higher priority CAPC for PSFCH transmission, thereby improving the communication quality of SL-U.

In a possible design, the second terminal equipment determines a fifth CAPC based on the predefined CAPC, and further, the second terminal equipment can perform LBT for the second PSFCH based on the fifth CAPC. In this way, when the second terminal device performs LBT for multiple PSFCHs, it can use different CAPCs to improve the reliability of PSFCH transmission, thereby improving the overall SL-U communication quality.

In a possible design, the second terminal device determines the fifth CAPC based on the predefined CAPC. The method may be: the second terminal device may subtract S from the predefined CAPC to obtain the In the fifth CAPC, the S is an integer greater than or equal to 1. In this way, when the second terminal device performs LBT for multiple PSFCHs, it can use different CAPCs, so that subsequent PSFCH executions of LBT use higher priority CAPCs, improving the reliability of PSFCH transmission, thereby improving the overall SL-U communication. quality.

In a possible design, the second terminal device receives third information, the third information is used to indicate that the fifth CAPC is determined based on the predefined CAPC, and the fifth CAPC is determined based on the fifth CAPC. The second PSFCH performs LBT. In this way, the second terminal device can determine whether to use different CAPCs for different PSFCHs based on the indication, so that when the same CAPC can be used, the power consumption of determining a new CAPC for each PSFCH transmission is saved.

In a fourth aspect, the present application also provides a communication device. The communication device may be a first terminal device, a processor, a chip or a functional module in the first terminal device. The communication device has the ability to implement the above-mentioned first aspect. Or the functions of the first terminal device in each possible design example of the first aspect. The functions described can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the structure of the communication device includes a transceiver unit and a processing unit. These units can perform the corresponding functions of the first terminal device in the above-mentioned first aspect or each possible design example of the first aspect. For details, see The detailed description in the method example will not be repeated here.

In a possible design, the structure of the communication device includes a transceiver and a processor, and optionally a memory. The transceiver is used to send and receive information or data, and to communicate with other devices in the communication system. Interactively, the processor is configured to support the communication device to perform the corresponding function of the first terminal device in the above-mentioned first aspect or each possible design example of the first aspect. The memory is coupled to the processor and holds program instructions and data necessary for the communications device.

In a fifth aspect, this application also provides a communication device. The communication device may be a second terminal device, a processor, a chip or a functional module in the second terminal device. The communication device has the ability to implement the above second aspect. or the functionality of the second terminal device in each possible design example of the second aspect. The functions described can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the structure of the communication device includes a transceiver unit and a processing unit. These units can perform the corresponding functions of the second terminal device in the above second aspect or each possible design example of the second aspect. For details, see Detailed description in method example, No further details will be given here.

In a possible design, the structure of the communication device includes a transceiver and a processor, and optionally a memory. The transceiver is used to send and receive information or data, and to communicate with other devices in the communication system. Interactively, the processor is configured to support the communication device to perform the corresponding function of the second terminal device in the above second aspect or each possible design example of the second aspect. The memory is coupled to the processor and holds program instructions and data necessary for the communications device.

In a sixth aspect, the present application also provides a communication device. The communication device may be a second terminal device, a processor, a chip or a functional module in the second terminal device. The communication device has the ability to implement the above third aspect. or the functionality of the second terminal device in each possible design example of the third aspect. The functions described can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In one possible design, the structure of the communication device includes a transceiver unit and a processing unit. These units can perform the corresponding functions of the second terminal device in the above third aspect or each possible design example of the third aspect. For details, see The detailed description in the method example will not be repeated here.

In a possible design, the structure of the communication device includes a transceiver and a processor, and optionally a memory. The transceiver is used to send and receive information or data, and to communicate with other devices in the communication system. Interactively, the processor is configured to support the communication device to perform the corresponding function of the second terminal device in the above third aspect or each possible design example of the third aspect. The memory is coupled to the processor and holds program instructions and data necessary for the communications device.

In a seventh aspect, embodiments of the present application provide a communication system, which may include the first terminal device in the first aspect and each possible design of the first aspect and the second aspect and each possible design of the second aspect. second terminal equipment, etc.; or may include the first terminal equipment, the second terminal equipment, etc. in the above-mentioned third aspect and each possible design of the third aspect.

In an eighth aspect, embodiments of the present application provide a computer-readable storage medium. The computer-readable storage medium stores program instructions. When the program instructions are run on a computer, they cause the computer to execute the first aspect of the embodiments of the application and its operations. any possible design, or the second aspect and any possible design thereof, or the method described in the third aspect and any possible design thereof. By way of example, computer-readable storage media can be any available media that can be accessed by a computer. Taking this as an example but not limited to: computer-readable media may include non-transitory computer-readable media, random-access memory (random-access memory, RAM), read-only memory (read-only memory, ROM), electrically erasable memory In addition to programmable read-only memory (electrically EPROM, EEPROM), CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or can be used to carry or store the desired program code in the form of instructions or data structures and can Any other media accessed by a computer.

In a ninth aspect, embodiments of the present application provide a computer program product that includes computer program code or instructions. When the computer program code or instructions are run on a computer, the first aspect or any of the possible designs of the first aspect are enabled. , or the method described in the above-mentioned second aspect or any possible design of the second aspect, or the above-mentioned third aspect or any possible design of the third aspect is executed.

In a tenth aspect, the present application also provides a chip, including a processor, the processor being coupled to a memory and configured to read and execute program instructions stored in the memory, so that the chip implements the above first aspect Or in any possible design of the first aspect, or in the above second aspect or any possible design of the second aspect, or in the above third aspect or any possible design of the third aspect, the method described.

For each aspect in the above fourth to tenth aspects and the technical effects that may be achieved by each aspect, please refer to the above for the first aspect or various possible solutions in the first aspect, or the above second aspect or each of the second aspects. possible solutions, or descriptions of the third aspect and the technical effects that can be achieved by various possible solutions in the third aspect, will not be repeated here.

Description of drawings

Figure 1 is a schematic diagram of the architecture of a communication system provided by this application;

Figure 2 is an architectural schematic diagram of another communication system provided by this application;

Figure 3 is an architectural schematic diagram of another communication system provided by this application;

Figure 4 is a flow chart of a communication method provided by this application;

Figure 5 is a flow chart of another communication method provided by this application;

Figure 6 is a schematic structural diagram of a communication device provided by this application;

Figure 7 is a structural diagram of a communication device provided by this application.

Detailed ways

The present application will be described in further detail below with reference to the accompanying drawings.

Embodiments of this application provide a communication method and device to clarify how a terminal device performs LBT in an SL-U scenario and improve the communication quality of SL-U. Among them, the method and the device described in this application are based on the same technical concept. Since the principles of solving problems by the method and the device are similar, the implementation of the device and the method can be referred to each other, and the repeated parts will not be repeated.

To facilitate understanding, some terms involved in the embodiments of this application are first explained below.

1)SL communication

In a wireless communication system, data communication between terminal devices can be carried out through network equipment, or communication between terminal equipment can be carried out directly without the help of network equipment. Direct communication between terminal equipment and terminal equipment is SL communication.

In SL communication, the interface between terminal equipment and terminal equipment is called proximity-based services communication 5 (PC5) interface, and the link between terminal equipment and terminal equipment is called SL. .

One application scenario of SL communication is the vehicle-to-everything (V2X) Internet of Vehicles scenario. In the Internet of Vehicles, each car is a terminal device, and data can be transmitted directly between terminal devices through SL without going through the network, which can effectively reduce communication delays.

SL communication supports unicast, multicast, and broadcast.

2) How the terminal device obtains SL resources

There are two ways for terminal devices to obtain SL resources, which are called mode 1 (mode1) and mode 2 (mode2).

Mode1: The terminal device obtains SL resources from the network device. The network device can schedule SL resources to the terminal device through downlink control information (DCI), or the network device can use radio resource control (RRC) messages. Configure the SL configuration grant (configured grant) for the terminal device.

Mode2: The terminal device can receive the SL resource pool configuration from the network device, or the terminal device can obtain the SL resource pool configuration from the preconfiguration, and then the terminal device selects the SL resource in the SL resource pool. Among them, the terminal device may select SL resources randomly, or based on the results of sensing or partial sensing.

3) Unlicensed spectrum

In order to fully, reasonably and effectively utilize radio spectrum resources, ensure the normal operation of radio services, and prevent mutual interference between various radio services, radio stations and systems, frequency bands are divided. Technologies such as 2/3/4G use licensed spectrum and need to be applied for by telecom operators before they can be used. They have low interference and are safe.

Technologies such as WiFi, Bluetooth, and Wireless Personal Area Network (Zigbee) use unlicensed spectrum. They are intended to serve as supplementary tools for operators to enhance their service offerings. In order to share spectrum, licensed spectrum communications can be used without application and are free of charge. On unlicensed spectrum, communications need to comply with certain regulations, such as listen-before-talk (LBT) and occupied channel bandwidth (OCB) requirements, which are used to ensure that devices operating on this spectrum Access fairness among various types of terminal devices. SL communication on unlicensed spectrum is called SL-U.

4)LBT

LBT can also be called the channel access process. Typically LBT is performed at channel (eg, 20 megahertz (MHz)) granularity. Before a communication device sends a signal (for example, a data signal) on a certain channel (for example, a first channel), it may first detect whether the first channel is idle, for example, whether it detects that a nearby communication device is occupying the first channel. To send a signal, this detection process can be called clear channel assessment (CCA) or channel access process.

LBT is divided into two types: type 1 (type 1) and type 2 (type 2). Type 1 LBT is a channel access process based on a fixed duration (it can also be called the first type of channel access process). The LBT of 2 is the backoff-based channel access process (which can also be called the second type of channel access process).

5) Channel access priority class (CAPC)

When the terminal device performs LBT of type 1 (fixed-duration energy detection) (that is, the first type of channel access process), it needs to determine the channel occupancy time (COT) based on CAPC. The relationship between CAPC and COT can be shown in Table 1 below. The first column in Table 1 represents the CAPC value. The smaller the CAPC value, the higher the priority corresponding to the CAPC. The fifth column in Table 1 represents the corresponding priority of different CAPC values. COT size (unit: ms). It is understandable that the meanings of other columns in Table 1 can refer to existing standards and will not be described in detail here.

Table 1

6) The terminal device may be, for example, the terminal device itself, or a module used to implement the functions of the terminal device, such as a chip or a chip system, and the chip or chip system may be provided in the terminal device. Terminal equipment, also known as user equipment (UE), mobile station (MS), mobile terminal (MT), etc., is a device that provides voice and/or data connectivity to users. equipment. For example, the terminal device may include a handheld device with a wireless connection function, a vehicle-mounted device, etc. Currently, terminal devices can be: mobile phones, tablets, laptops, PDAs, mobile Internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality ( augmented reality (AR) equipment, XR equipment, MR equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, intelligent Wireless terminals in the power grid (smart grid), wireless terminals in transportation safety (transportation safety), wireless terminals in smart cities (smart city), or wireless terminals in smart homes (smart home), etc.

Terminal equipment can also be device-to-device communication (device-to-device, D2D) terminal equipment, Internet of Vehicles V2X communication terminal equipment, smart vehicles, vehicle-to-machine systems (or Internet of Vehicles systems) (telematics box, TBOX), machine to Machine-to-machine/machine-type communications (M2M/MTC) terminal equipment, Internet of things (IoT) terminal equipment. For example, the terminal device may be a vehicle, ship or aircraft, or a terminal-type roadside unit, or a communication module or chip built into the vehicle or roadside unit. For example, the terminal device can be a vehicle-mounted module. The terminal equipment can also be a road side unit (RSU). If the various terminal devices introduced above are located on the vehicle, such as placed or installed in the vehicle, they can be considered as vehicle-mounted terminal equipment. The vehicle-mounted terminal equipment is also called an on-board unit (OBU), for example.

As an example and not a limitation, in this embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices or smart wearable devices. It is a general term for applying wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes. wait. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not just hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly defined wearable smart devices include full-featured, large-sized devices that can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, and those that only focus on a certain type of application function and need to cooperate with other devices such as smartphones. Used, such as various smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.

Terminal devices can also be smart devices such as amusement equipment, smart appliances, or drones.

In the description of the embodiments of this application, a terminal device is taken as an example for explanation.

7) Network equipment, equipment that provides access to terminal equipment. Network devices may include radio access network (RAN) devices, such as base stations. Network equipment may also refer to equipment that communicates with terminal equipment over the air interface. The network equipment may include an evolved base station (evolved Node B, which may be referred to as eNB or e-NodeB) in the LTE system or long term evolution-advanced (LTE-A). eNB is a device deployed in a wireless access network that meets the fourth generation (the fourth generation, 4G) standards of mobile communication technology to provide wireless communication functions for terminal equipment. The network device can also be a new radio controller (NR controller), it can be a (gNode B, gNB) in the 5G system, it can be a centralized network element (centralized unit), it can be a new wireless base station, it can be The radio frequency remote module can be a micro base station (also called a small station), a relay, a distributed unit, various forms of macro base stations, or a transmission and reception point. (transmission reception point, TRP), transmission measurement function (TMF), transmission point (transmission point, TP) or any other wireless access equipment, the embodiments of the present application are not limited thereto. Network devices may also include radio network controller (RNC), Node B (Node B, NB), base station controller (BSC), base station Transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), base band unit (base band unit, BBU) or remote radio unit (RRU), or Wireless fidelity (Wifi) access point (AP), or baseband pool (BBU pool) and RRU in cloud radio access network (cloud radio access netowrk, CRAN), etc. The embodiments of this application do not limit the specific technologies and specific equipment forms used by network equipment. For example, a network device may correspond to an eNB in a 4G system and a gNB in a 5G system.

In addition, the base station in the embodiment of the present application may include a centralized unit (CU) and a distributed unit (DU), and multiple DUs may be centrally controlled by one CU. CU and DU can be divided according to the protocol layer functions of the wireless network they possess. For example, the functions of the packet data convergence protocol (PDCP) layer and above are set in CU and the protocol layer below PDCP, such as wireless link. Functions such as the radio link control (RLC) layer and the medium access control (medium access control, MAC) layer are set in the DU. It should be noted that this division of protocol layers is just an example, and division can also be performed on other protocol layers. The radio frequency device can be remote and not placed in the DU, or it can be integrated in the DU, or partially remote and partially integrated in the DU. The embodiments of this application do not impose any restrictions. In addition, in some embodiments, the control plane (CP) and user plane (UP) of the CU can also be separated and implemented into different entities, respectively control plane CU entities (CU-CP entities). and user plane CU entities (CU-UP entities). In this network architecture, the signaling generated by the CU can be sent to the terminal device through the DU, or the signaling generated by the UE can be sent to the CU through the DU. The DU may directly encapsulate the signaling through the protocol layer and transparently transmit it to the terminal device or CU without parsing the signaling. In this network architecture, the CU is divided into network equipment on the RAN side. In addition, the CU can also be divided into network equipment on the core network (core network, CN) side. This application does not limit this.

In this application, the network device may also be a central processing unit (central processing element, CPE), router, etc.

In this application, the network device can also be a functional module, chip or chip system. Optionally, the functional module, chip or chip system can be disposed in the network device.

In the description of the embodiments of this application, network equipment is taken as an example for explanation.

8) In the description of this application, words such as "first" and "second" are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor as indicating or implying order.

In the description in this application, "at least one (species)" refers to one (species) or multiple (species), and multiple (species) refers to two (species) or more than two (species). "At least one of the following" or similar expressions thereof refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, a and b, a and c, b and c, or a, b and c, where a, b, c Can be single or multiple.

"And/or" in the description of this application describes the relationship between associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. situation, where A and B can be singular or plural. "/" means "or", for example, a/b means a or b.

In order to describe the technical solutions of the embodiments of the present application more clearly, the communication method and device provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The communication method provided by the embodiments of this application can be applied to various communication systems. For example, the communication method provided by this application can be applied to long term evolution (long term evolution, LTE) system, fifth generation (5th generation, 5G) communication system ( Such as new wireless (new radio, NR) system), next-generation wireless LAN system, and future sixth generation (6th generation, 6G) communication system or other systems.

Figure 1 shows the architecture of a possible communication system to which the communication method provided by this application is applicable. The communication system may include a network device and at least two terminal devices. For example, the at least two terminal devices may be as shown in Figure 1 first terminal device and second terminal device. Among them, the Uu interface is used for communication between the first terminal device and the network device. The first terminal device and the second terminal device use the unlicensed spectrum for SL communication and use the PC5 interface for communication. The first terminal device and the second terminal device can work in mode 1 or mode 2, that is, the first terminal device and the second terminal device can obtain SL resources in mode 1 or mode 2.

The communication between the first terminal device and the second terminal device may be unicast communication or multicast communication, which is not limited in this application.

In one example, the first terminal device is the sender of data, the second terminal device is the receiver of data, and the second terminal device can perform a physical sidelink feedback channel (PSFCH) to the first terminal device. )transmission. It should be understood that when the second terminal device sends PSFCH information to the first terminal device, the second terminal device is the sending end and the first terminal device is the receiving end.

It should be noted that the communication system shown in Figure 1 is only an exemplary illustration and is not intended to limit the communication system of the present application. The communication system may also include other devices, which are not limited in this application.

Figure 2 shows the architecture of another possible communication system to which the communication method provided by this application is applicable. The communication system may include remote terminal equipment (remote UE), relay terminal equipment (relay UE), network equipment, etc. The communication system can be applied to UE-relay -Network communication scenario, that is, the remote terminal device accesses the network through the relay terminal device. The communication between the remote terminal equipment and the relay terminal equipment is SL communication, and the remote terminal equipment and the relay terminal equipment can use unlicensed spectrum for SL communication.

It should be noted that the communication system shown in FIG. 2 is not limited to only include the devices shown in FIG. 2 , but may also include other devices not shown in FIG. 2 , which will not be listed one by one in this application.

Figure 3 shows the architecture of another possible communication system to which the communication method provided by this application is applicable. The communication system can include at least three terminal devices, such as the source terminal equipment (source UE) shown in Figure 3, the middle Relay terminal equipment (relay UE), target terminal equipment (target UE), etc. The communication system can be applied to a UE-UE-UE relay communication scenario, that is, the source terminal device communicates with the target terminal device through the relay terminal device. The communication between the source terminal device and the relay terminal device is SL communication, and the source terminal device and the relay terminal device can use unlicensed spectrum for SL communication. The communication between the relay terminal equipment and the target terminal equipment is SL communication, and the relay terminal equipment and the target terminal equipment can use unlicensed spectrum for SL communication.

It should be noted that the communication system shown in FIG. 3 is not limited to only include the devices shown in FIG. 3 , but may also include other devices not shown in FIG. 3 , which will not be listed one by one in this application.

In SL-U, when SL HARQ feedback is transmitted on the PSFCH, there is currently no clear method for the terminal equipment to perform the LBT process, which may affect the communication quality of SL-U. Based on this, embodiments of this application provide a communication method to clarify how the terminal device performs LBT in the SL-U scenario and improve the communication quality of SL-U.

It should be noted that in the following embodiments, the communication method provided by this application is described in detail by taking terminal equipment and network equipment as examples. It should be understood that the operations performed by the terminal equipment can also be performed by the processor in the terminal equipment, or by the chip. Or a chip system, or a functional module, etc. The operations performed by the network device can also be implemented by a processor in the network device, or a chip or chip system, or a functional module, etc. This application is not limited to this.

Based on the above description, a communication method provided by the embodiment of the present application can be seen as shown in Figure 4 . The process of this method can include:

Step 401: The first terminal device determines the first CAPC.

In an optional implementation, the first terminal device may determine the first CAPC through the following method:

Method a1: The first terminal device receives a first DCI from the network device, the first DCI is used to schedule SL resources, and the first DCI indicates the first CAPC.

Optionally, in method a1, the first terminal device can perform SL transmission based on dynamic grant (DG). That is, the first terminal device works in mode 1, and the network device schedules SL resources to the first terminal device through the first DCI.

For example, when the first DCI indicates the first CAPC, it can be implemented by including the first CAPC in the first DCI, or it can be implemented by including information indicating the first CAPC in the first DCI, or it can also be implemented in other ways. There are no restrictions on application.

Method a2: The first terminal device determines the first CAPC according to the first preset rule and the first transport block (TB).

In one example, in method a2, the first terminal device may perform SL transmission based on configured grant (CG). That is, the first terminal device works in mode 1, and the network device configures SL configuration authorization for the first terminal device through an RRC message.

In another example, in method a2, the first terminal device may perform SL transmission based on mode2.

Optionally, the first TB may be the TB when the first terminal device performs SL transmission.

Optionally, the first TB may be the TB when the first terminal device performs SL transmission to the second terminal device.

Exemplarily, the first terminal device determines the first CAPC according to the first preset rule and the first TB. The method may be as follows:

Method b1: When the first TB includes at least one media access control control element (MAC CE), the first terminal device determines the first CAPC as the highest priority among the CAPCs corresponding to at least one MAC CE. CAPC; when the first TB does not include at least one MAC CE and includes at least one sidelink control channel service data unit (SCCH SDU), the first terminal device determines that the first CAPC is at least The CAPC with the highest priority among the CAPCs corresponding to one SCCH SDU; when the first TB does not include at least one MAC CE and at least one SCCH SDU, and includes at least one sidelink traffic channel service data unit (sidelink traffic channel service data unit) , STCH SDU), the first terminal device determines the first CAPC to be the CAPC with the lowest priority among the CAPCs corresponding to at least one STCH SDU or at least one logical channel (logical channel, LCH).

That is to say, when the first TB does not include at least one MAC CE and at least one SCCH SDU, and includes at least one STCH SDU, the first terminal device can determine that the first CAPC is the lowest priority among the CAPCs corresponding to at least one STCH SDU. CAPC, or the first terminal device may also determine the first CAPC as the CAPC with the lowest priority among the CAPCs corresponding to at least one LCH.

Among them, in this application, the value of CAPC with higher priority is smaller, and the value of CAPC with lower priority is larger.

It can be understood that the LCH can be SCCH or STCH. One SCCH SDU can correspond to one LCH, and one STCH SDU can correspond to one LCH. The LCH corresponding to SCCH SDU is different from the LCH corresponding to STCH SDU.

Method b2: The first terminal device determines the first CAPC as the CAPC with the highest priority among the CAPCs corresponding to at least one LCH and/or at least one MAC CE included in the first TB.

In method b2, the first CAPC may be the CAPC with the highest priority among the CAPCs corresponding to at least one LCH, or the first CAPC may be the CAPC with the highest priority among the CAPCs corresponding to at least one MAC CE, or the first CAPC may be The CAPC with the highest priority among the CAPCs corresponding to at least one LCH and at least one MAC CE.

Optionally, at least one LCH may correspond to at least one SCCH SDU, or may correspond to at least one STCH SDU, or may correspond to at least one SCCH SDU and at least one STCH SDU.

In this application, the first TB containing at least one LCH may be understood to mean that the first TB contains at least one LCH data or at least one LCH information.

Compared with the above-mentioned method b1, the implementation complexity of this method b2 is lower.

Method a3: The first terminal device determines that the CAPC corresponding to the first LCH or the first MAC CE is the first CAPC. The first LCH or the first MAC CE is used to trigger the first terminal device to select or reselect the SL resource. The first LCH or There is a corresponding relationship between the first MAC CE and CAPC.

Optionally, in method a3, the first terminal device may perform SL transmission based on mode2.

In one possible way, the first terminal device selects or reselects the SL resource. It may select or reselect from the same SL resource pool as the previously selected SL resource, or it may select or reselect from a different SL resource pool.

Step 402: The first terminal device sends the first information to the second terminal device. Correspondingly, the second terminal device receives the first information from the first terminal device. The first information is used to indicate the second CAPC, and the second CAPC is used to indicate the second CAPC. The second terminal equipment performs LBT on the first PSFCH.

In a possible example, the second CAPC is the same as the first CAPC.

In another possible example, the second CAPC is determined based on the first CAPC, and the second CAPC is different from the first CAPC.

For example, when the second CAPC is determined based on the first CAPC, the second CAPC may be the value obtained by subtracting N from the first CAPC, where N is an integer greater than or equal to 1. Optionally, when the value obtained by subtracting N from the first CAPC is less than 1, the second CAPC may be 1.

Optionally, the first information is used to indicate the second CAPC, which can be implemented by including the second CAPC in the first information, or by including information indicating the second CAPC in the first information, or it can also be implemented in other ways, This application does not limit this.

Optionally, the first information may be sidelink control information (SCI).

In an optional implementation, the first information may also indicate that the second CAPC is used for PSFCH transmission. Specifically, it can be indicated in the following two ways:

In manner c1, the first information includes first indication information, and the first indication information is used to instruct the second CAPC to be used for PSFCH transmission.

For example, when the first information is SCI, the first indication information may be a dedicated field in the SCI.

In mode c2, the format of the first information is the first format, and the first format is used to indicate that the second CAPC is used for PSFCH transmission.

For example, when the first information is the SCI, it indicates that the SCI used by the second CAPC for PSFCH transmission is different from the SCI format of other functioning SCIs. For example, the SCI indicating that the second CAPC is used for PSFCH transmission is in a different format than the SCI carrying SL COT sharing.

Step 403: The second terminal device performs LBT on the first PSFCH according to the second CAPC.

Optionally, the first PSFCH may be determined based on the mapping relationship between a physical sidelink control channel (PSSCH) and the PSFCH, or the first PSFCH may be indicated by the first terminal device. In this case, when the first PSFCH is determined based on the mapping relationship or the indication of the first terminal equipment, that is, when the determination of the PSFCH is related to the actual service communication, the second terminal equipment may be based on the CAPC indicated by the first terminal equipment. LBT for PSFCH can enable the CAPC transmitted by PSFCH to flexibly adapt to actual business communication needs and improve the communication quality of SL-U.

In an optional implementation, when the second terminal device performs LBT for the first PSFCH according to the second CAPC, the following method may be included:

Method d1: The second terminal device directly performs LBT on the first PSFCH according to the second CAPC.

In method d1, that is, the second terminal device does not process the second CAPC and can directly use the second CAPC.

Method d2: The second terminal device determines the third CAPC based on the second CAPC, and further, the second terminal device performs LBT on the first PSFCH based on the third CAPC.

For example, when the second terminal device determines that the second CAPC is less than or equal to the first threshold, the second terminal device determines that the second CAPC is less than or equal to the first threshold. Three CAPC; alternatively, when the second terminal device determines that the second CAPC is greater than the first threshold, the second terminal device determines the third CAPC.

Optionally, the third CAPC determined by the second terminal device when the second CAPC is less than or equal to the first threshold is different from the third CAPC determined by the second terminal device when the second CAPC is greater than the first threshold.

The first threshold, the third CAPC determined by the second terminal device when the second CAPC is less than or equal to the first threshold, and the third CAPC determined by the second terminal device when the second CAPC is greater than the first threshold, may be predetermined. Defined, or can be configured for the network device, or configured for the first terminal device, or can be determined by the second terminal device itself.

In an optional implementation, when the second terminal device performs LBT for multiple PSFCHs, the same CAPC can be used, for example, the above-mentioned second CAPC is used.

In this application, multiple PSFCH transmissions correspond to the same PSSCH transmission. The first PSFCH may be any PSFCH among multiple PSFCHs corresponding to the same PSSCH transmission, for example, it may be the first PSFCH or other PSFCH, which is not limited in this application.

In an optional implementation, when the second terminal device performs LBT for multiple PSFCHs, different CAPCs can also be used, so that subsequent PSFCH executions of LBT use higher priority CAPCs to improve the reliability of PSFCH transmission. , thereby improving the overall SL-U communication quality.

For example, the second terminal device may determine the fourth CAPC according to the second CAPC, and then the second terminal device may perform LBT on the second PSFCH according to the fourth CAPC. The second PSFCH may be a certain PSFCH after the first PSFCH. For example, when the first PSFCH is the first PSFCH among multiple PSFCHs, the second PSFCH may be the second PSFCH among the multiple PSFCHs, or the second PSFCH may be the second PSFCH among the plurality of PSFCHs. Three PSFCHs, or one of the following PSFCHs.

Optionally, the second terminal device subtracts M from the second CAPC to obtain the fourth CAPC, where M is an integer greater than or equal to 1.

Wherein, when the second PSFCH is a different PSFCH after the first PSFCH, the corresponding M value is different. For example, the first PSFCH is the first PSFCH, and when the second PSFCH is the second PSFCH, the corresponding M value can be A; when the second PSFCH is the third PSFCH, the corresponding M value is 2A; in sequence By analogy, we will not give examples one by one, where A is an integer greater than or equal to 1. It should be understood that the description here only takes the first PSFCH as the first PSFCH as an example, and does not limit which PSFCH among the plurality of PSFCHs the first PSFCH is.

In other words, the CAPC corresponding to each subsequent PSFCH is the CAPC corresponding to the previous PSFCH minus A.

Optionally, when one PSSCH corresponds to multiple PSFCHs, the CAPC corresponding to the first PSFCH among the multiple PSFCHs can be used as the initial CAPC, and the CAPC corresponding to each PSFCH after the first PSFCH can be the CAPC corresponding to the previous PSFCH. Minus A. For example, when the first PSFCH is the first PSFCH among multiple PSFCHs, the initial CAPC may be the second CAPC.

Optionally, when a certain PSFCH obtains the corresponding CAPC based on the CAPC corresponding to the previous PSFCH minus A, the above subtraction operation is performed when the CAPC corresponding to the previous PSFCH is greater than 1. That is to say, when the CAPC corresponding to a certain PSFCH is less than or equal to 1, the subsequent PSFCH will no longer perform the above subtraction operation, and the CAPC corresponding to the subsequent PSFCH can all use 1.

Among them, the above is an example based on the CAPC corresponding to the first PSFCH being the second CAPC. It should be understood that when the first PSFCH corresponds to the third CAPC as described in the above method d2, the next PSFCH after the first PSFCH The corresponding CAPC can be obtained by subtracting A from the third CAPC. For example, when the first PSFCH is the first PSFCH among multiple PSFCHs, the initial CAPC may be the third CAPC, and the CAPC corresponding to the next PSFCH (that is, the second PSFCH) may be the third CAPC minus A.

In an optional implementation manner, when the second terminal device fails to perform LBT on the first PSFCH, the second terminal device performs LBT on the second PSFCH. Of course, when the second terminal device successfully performs LBT on the first PSFCH, the second terminal device may also perform LBT on the second PSFCH, which is not limited in this application.

In a possible design, the second terminal device receives second information, and the second information is used to indicate determining the fourth CAPC based on the second CAPC, and performing LBT for the second PSFCH based on the fourth CAPC. That is, the second information indicates that the CAPC corresponding to the second PSFCH is determined based on the CAPC corresponding to the first PSFCH, and the second terminal device performs the above-mentioned subtraction operation after receiving the second information.

Optionally, the second terminal device may receive the second information from the network device, or may also receive the second information from the first terminal device.

Using the above communication method provided by the embodiment of the present application, the second terminal device can perform LBT on the PSFCH based on the CAPC indicated by the first terminal device, which can make the CAPC transmitted by the PSFCH flexibly adapt to actual business communication requirements and improve the performance of SL-U. Communication quality.

Based on the above description, another communication method provided by the embodiment of the present application can be seen as shown in FIG. 5 . The process of this method can include:

Step 501: The second terminal device receives the SCI from the first terminal device.

Step 502: When the second terminal device determines that the SCI does not indicate CAPC, it performs LBT on the first PSFCH according to the predefined CAPC.

In an optional implementation manner, the first PSFCH may be determined by the second terminal device, and the manner in which the second terminal device determines the first PSFCH is not limited in this application. In this case, when the first PSFCH is determined by the second terminal device, that is, when the determination of the PSFCH is not directly related to the actual service communication, the second terminal device performs LBT on the PSFCH based on the predefined CAPC. This allows the CAPC for PSFCH transmission to be used in some cases without adapting to actual business communication requirements, and uses higher priority CAPC for PSFCH transmission, thus improving the communication quality of SL-U.

In an optional implementation, when the second terminal device performs LBT for multiple PSFCHs, the same CAPC may be used, for example, the above-mentioned predefined CAPC may be used.

For example, the second terminal device determines the fifth CAPC according to the predefined CAPC, and then the second terminal device performs LBT on the second PSFCH according to the fifth CAPC. The second PSFCH may be a certain PSFCH after the first PSFCH. For example, when the first PSFCH is the first PSFCH among multiple PSFCHs, the second PSFCH may be the second PSFCH among the multiple PSFCHs, or the second PSFCH may be the second PSFCH among the plurality of PSFCHs. Three PSFCHs, or one of the following PSFCHs.

Optionally, the second terminal device can subtract S from the predefined CAPC to obtain the fifth CAPC, where S is an integer greater than or equal to 1.

Wherein, when the second PSFCH is a different PSFCH after the first PSFCH, the corresponding S value is different. For example, the first PSFCH is the first PSFCH, and when the second PSFCH is the second PSFCH, the corresponding S value can be B; when the second PSFCH is the third PSFCH, the corresponding M value is 2B; in sequence By analogy, we will not give examples one by one, where B is an integer greater than or equal to 1. It should be understood that the description here only takes the first PSFCH as the first PSFCH as an example, and does not limit which PSFCH among the plurality of PSFCHs the first PSFCH is.

In other words, the CAPC corresponding to each subsequent PSFCH is the CAPC corresponding to the previous PSFCH minus B.

Optionally, when one PSSCH corresponds to multiple PSFCHs, the CAPC corresponding to the first PSFCH among the multiple PSFCHs can be used as the initial CAPC, and the CAPC corresponding to each PSFCH after the first PSFCH can be the CAPC corresponding to the previous PSFCH. Minus B. For example, when the first PSFCH is the first PSFCH among multiple PSFCHs, the initial CAPC may be a predefined CAPC.

Optionally, when a certain PSFCH obtains the corresponding CAPC based on subtracting B from the CAPC corresponding to the previous PSFCH, the above subtraction operation is performed when the CAPC corresponding to the previous PSFCH is greater than 1. That is to say, when the CAPC corresponding to a certain PSFCH is less than or equal to 1, the subsequent PSFCH will no longer perform the above subtraction operation, and the CAPC corresponding to the subsequent PSFCH can all use 1.

Exemplarily, the second terminal device receives the third information, and the third information is used to instruct to determine the fifth CAPC based on the predefined CAPC, and perform LBT for the second PSFCH according to the fifth CAPC. That is, the third information indicates that the CAPC corresponding to the second PSFCH is determined based on the predefined CAPC, and the second terminal device performs the above-mentioned subtraction S operation after receiving the third information.

Optionally, the second terminal device may receive the third information from the network device, or may also receive the third information from the first terminal device.

Using the above communication method provided by the embodiment of the present application, the second terminal device performs LBT for PSFCH based on the predefined CAPC, which can make the CAPC of PSFCH transmission not need to adapt to the actual business communication requirements in some cases, but use higher The priority CAPC performs PSFCH transmission, thereby improving the communication quality of SL-U.

In a possible embodiment, the second terminal device receives the first information indicating the second CAPC from the first terminal device, and subsequently the second terminal device can select a CAPC from the second CAPC and the predefined CAPC to target the first CAPC. A PSFCH performs LBT. For example, when the first PSFCH is determined based on the mapping relationship between PSSCH and PSFCH, or when the first PSFCH is indicated by the first terminal device, the second terminal device selects the second CAPC. For another example, when the first PSFCH may be determined by the second terminal device, the second terminal device may select a predefined CAPC. Of course, the second terminal device can also select a CAPC through other methods, which is not limited in this application. Similarly, when the second terminal device performs LBT on multiple PSFCHs corresponding to the same PSSCH transmission, the first PSFCH may be any one of the multiple PSFCHs corresponding to the same PSSCH transmission, for example, it may be the first PSFCH or Other PSFCHs are not limited in this application. Optionally, when the second terminal device performs LBT for multiple PSFCHs, the same CAPC, different CAPC can also be used. For specific methods, please refer to the description of the above embodiment, and will not be introduced in detail here.

In another possible embodiment, when the first PSFCH transmission time or part of the time also exists other SL transmission (such as PSSCH transmission), the SL transmission may be for the first terminal device or for other terminal devices. , the terminal equipment can determine to use the CAPC corresponding to the TB transmitted by the SL to perform LBT on the first PSFCH.

Based on the above embodiments, embodiments of the present application also provide a communication device. Referring to FIG. 6 , the communication device 600 may include a transceiver unit 601 and a processing unit 602 . The transceiver unit 601 is used for communicating with the communication device 600 , such as receiving information, messages or data, etc., or sending information, messages or data, etc., and the processing unit 602 is used for processing the communication device 600 . Actions are controlled and managed. The processing unit 602 can also control the steps performed by the transceiver unit 601.

For example, the communication device 600 may be the first terminal device in the above embodiment, a processor of the first terminal device, a chip, a chip system, a functional module, etc. Alternatively, the communication device 600 may specifically be the second terminal device in the above embodiment, a processor of the second terminal device, or a chip, or a chip system, or a functional module, etc.

In one embodiment, when the communication device 600 is used to implement the functions of the first terminal device in the embodiment shown in Figure 4, the processing unit 602 can be used to determine the first CAPC; the transceiver unit 601 can Used to send first information to the second terminal device, the first information being used to indicate a second CAPC, the second CAPC is the same as the first CAPC, or the second CAPC is determined based on the first CAPC ; The second CAPC is used for the second terminal equipment to perform listen-before-talk LBT for the first physical sidelink feedback channel PSFCH.

In an example, when determining the first CAPC, the processing unit 602 may be configured to: control the transceiver unit 601 to receive the first downlink control information DCI from the network device, where the first DCI is used for the scheduling side. Link SL resource, the first DCI indicates the first CAPC.

In another example, when determining the first CAPC, the processing unit 602 may be configured to: determine the first CAPC according to the first preset rule and the first transmission block TB.

Optionally, when determining the first CAPC according to the first preset rule and the first TB, the processing unit 602 may be used to:

When the first TB includes at least one media access control control element MAC CE, determine the first CAPC to be the CAPC with the highest priority among the CAPCs corresponding to the at least one MAC CE;

When the first TB does not include the at least one MAC CE and includes at least one sidelink control channel service data unit SCCH SDU, it is determined that the first CAPC is the CAPC corresponding to the at least one SCCH SDU. CAPC with the highest priority;

When the first TB does not include the at least one MAC CE and the at least one SCCH SDU and includes at least one sidelink service channel service data unit STCH SDU, it is determined that the first CAPC is the at least one SCCH SDU. The CAPC with the lowest priority among the CAPCs corresponding to an STCH SDU.

Optionally, when determining the first CAPC according to the first preset rule and the first TB, the processing unit 602 may be configured to: determine that the first CAPC is included in the first TB. The CAPC with the highest priority among the CAPCs corresponding to at least one logical channel LCH and/or at least one media access control control element MAC CE.

In another example, when determining the first CAPC, the processing unit 602 may be used to: determine that the CAPC corresponding to the first LCH or the first MAC CE is the first CAPC, and the first LCH or the first MAC CE is the first CAPC. A MAC CE is used to trigger the first terminal device to select or reselect SL resources, and there is a corresponding relationship between the first LCH or the first MAC CE and the CAPC.

In a possible manner, the first information includes first indication information, and the first indication information is used to instruct the second CAPC to be used for PSFCH transmission.

In another possible manner, the format of the first information is a first format, and the first format is used to indicate that the second CAPC is used for PSFCH transmission.

In another embodiment, when the communication device 600 is used to implement the functions of the second terminal device in the embodiment shown in Figure 4, the transceiver unit 601 can be used to receive the first information from the first terminal device, The first information is used to indicate the second CAPC; the processing unit 602 may be configured to perform listen-before-talk LBT for the first physical sidelink feedback channel PSFCH according to the second CAPC.

In an example, the first information may include first indication information, and the first indication information is used to instruct the second CAPC to be used for PSFCH transmission.

In another example, the format of the first information may be a first format, and the first format is used to indicate that the second CAPC is used for PSFCH transmission.

Optionally, the first PSFCH may be determined based on the mapping relationship between the physical sidelink shared channel PSSCH and the PSFCH, or, The first PSFCH may be indicated by the first terminal equipment.

In an optional implementation, when performing LBT on the first PSFCH according to the second CAPC, the processing unit 602 may be configured to: determine a third CAPC according to the second CAPC; CAPC performs LBT on the first PSFCH.

Exemplarily, when determining the third CAPC according to the second CAPC, the processing unit 602 may be configured to: determine the third CAPC when determining that the second CAPC is less than or equal to a first threshold; or , when it is determined that the second CAPC is greater than the first threshold, the third CAPC is determined.

In a possible manner, the processing unit 602 may also be configured to: determine a fourth CAPC according to the second CAPC; and perform LBT for the second PSFCH according to the fourth CAPC.

Optionally, when determining the fourth CAPC based on the second CAPC, the processing unit 602 may be used to: subtract M from the second CAPC to obtain the fourth CAPC, where M is greater than or equal to an integer of 1.

As a possible example, the transceiver unit 601 may also be configured to receive second information, the second information being used to indicate that the fourth CAPC is determined based on the second CAPC, and the fourth CAPC is determined based on the fourth CAPC. LBT is performed on the second PSFCH.

In another embodiment, when the communication device 600 is used to implement the functions of the second terminal device in the embodiment shown in Figure 5, the transceiver unit 601 can be used to receive a side link from the first terminal device. Control information SCI; the processing unit 602 may be configured to perform listen-before-talk LBT based on the predefined CAPC for the first physical sidelink feedback channel PSFCH when it is determined that the SCI does not indicate the channel access priority type CAPC.

Optionally, the first PSFCH may be determined by the second terminal equipment.

In a possible example, the processing unit 602 may be further configured to: determine a fifth CAPC according to the predefined CAPC; and perform LBT for the second PSFCH according to the fifth CAPC.

Exemplarily, when determining the fifth CAPC according to the predefined CAPC, the processing unit 602 may be used to: subtract S from the predefined CAPC to obtain the fifth CAPC, where S is greater than Or an integer equal to 1.

As a possible example, the transceiver unit 601 may also be configured to receive third information, and the third information may be used to indicate that the fifth CAPC is determined based on the predefined CAPC, and the fifth CAPC is determined based on the predefined CAPC. Five CAPCs perform LBT on the second PSFCH.

It should be noted that the division of units in the embodiment of the present application is schematic and is only a logical function division. In actual implementation, there may be other division methods. Each functional unit in the embodiment of the present application can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to cause a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in various embodiments of the application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program code. .

Based on the above embodiments, embodiments of the present application also provide a communication device. Referring to FIG. 7 , the communication device 700 may include a transceiver 701 and a processor 702 . Optionally, the communication device 700 may also include a memory 703. The memory 703 may be disposed inside the communication device 700 or may be disposed outside the communication device 700 . Among them, the processor 702 can control the transceiver 701 to receive and send messages, information, messages or data, etc.

Specifically, the processor 702 may be a central processing unit (CPU), a network processor (NP) or a combination of CPU and NP. The processor 702 may further include a hardware chip. The above-mentioned hardware chip can be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The above-mentioned PLD can be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general array logic (GAL) or any combination thereof.

The transceiver 701, the processor 702 and the memory 703 are connected to each other. Optionally, the transceiver 701, the processor 702 and the memory 703 are connected to each other through a bus 704; the bus 704 may be a Peripheral Component Interconnect (PCI) bus or an extended industry standard Structure(Extended Industry Standard Architecture, EISA) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of presentation, only one thick line is used in Figure 7, but it does not mean that there is only one bus or one type of bus.

In an optional implementation, the memory 703 is used to store programs, etc. Specifically, the program may include program code including computer operating instructions. The memory 703 may include RAM, and may also include non-volatile memory (non-volatile memory), such as one or more disk memories. The processor 702 executes the application program stored in the memory 703 to implement the above functions, thereby realizing the functions of the communication device 700 .

For example, the communication device 700 may be the first terminal device in the above embodiment; it may also be the second terminal device in the above embodiment.

In one embodiment, when the communication device 700 implements the functions of the first terminal device in the embodiment shown in Figure 4, the transceiver 701 can implement the sending and receiving operations performed by the first terminal device in the above embodiment; The processor 702 can implement other operations other than the sending and receiving operations performed by the first terminal device in the above embodiments. For specific relevant descriptions, please refer to the relevant descriptions in the embodiment shown in FIG. 4 , and will not be introduced in detail here.

In another embodiment, when the communication device 700 implements the functions of the second terminal device in the embodiment shown in FIG. 4, the transceiver 701 can implement the sending and receiving operations performed by the second terminal device in the above embodiment. ; The processor 702 may implement other operations other than the sending and receiving operations performed by the second terminal device in the above embodiment. For specific relevant descriptions, please refer to the relevant descriptions in the embodiment shown in FIG. 4 , and will not be introduced in detail here.

In another embodiment, when the communication device 700 implements the functions of the second terminal device in the embodiment shown in FIG. 5, the transceiver 701 can implement the sending and receiving operations performed by the second terminal device in the above embodiment. ; The processor 702 may implement other operations other than the sending and receiving operations performed by the second terminal device in the above embodiment. For specific relevant descriptions, please refer to the relevant descriptions in the embodiment shown in FIG. 5 , and will not be introduced in detail here.

Based on the above embodiments, embodiments of the present application provide a communication system, which may include the first terminal device and the second terminal device involved in the above embodiments.

Embodiments of the present application also provide a computer-readable storage medium. The computer-readable storage medium is used to store a computer program. When the computer program is executed by a computer, the computer can implement the implementation shown in Figure 4 or Figure 5. Example method provided.

An embodiment of the present application also provides a computer program product. The computer program product is used to store a computer program. When the computer program is executed by a computer, the computer can implement the method provided by the embodiment shown in Figure 4 or Figure 5. .

An embodiment of the present application also provides a chip, including a processor, which is coupled to a memory and configured to call a program in the memory so that the chip implements the method provided by the embodiment shown in Figure 4 or Figure 5. .

An embodiment of the present application also provides a chip, the chip is coupled to a memory, and the chip is used to implement the method provided by the embodiment shown in FIG. 4 or FIG. 5 .

Those skilled in the art will understand that embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment that combines software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the present application. It will be understood that each process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device produce a use A device for realizing the functions specified in one process or multiple processes of the flowchart and/or one block or multiple blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory that causes a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction means, the instructions The device implements the functions specified in a process or processes of the flowchart and/or a block or blocks of the block diagram.

These computer program instructions may also be loaded onto a computer or other programmable data processing device, causing a series of operating steps to be performed on the computer or other programmable device to produce computer-implemented processing, thereby executing on the computer or other programmable device. Instructions provide steps for implementing the functions specified in a process or processes of a flowchart diagram and/or a block or blocks of a block diagram.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and its equivalent technology, the present application is also intended to include these modifications and variations. Variations included.

Claims

A communication method, characterized by including:

The first terminal device determines the first channel access priority type CAPC;

The first terminal device sends first information to the second terminal device, the first information is used to indicate a second CAPC, the second CAPC is the same as the first CAPC, or the second CAPC is based on the The first CAPC is determined; the second CAPC is used for the second terminal equipment to perform listen-before-talk LBT for the first physical sidelink feedback channel PSFCH.
The method of claim 1, wherein the first terminal device determines the first CAPC, including:

The first terminal device receives first downlink control information DCI from a network device, the first DCI is used to schedule sidelink SL resources, and the first DCI indicates the first CAPC.
The method of claim 1, wherein the first terminal device determines the first CAPC, including:

The first terminal device determines the first CAPC according to a first preset rule and a first transmission block TB.
The method of claim 3, wherein the first terminal device determines the first CAPC according to the first preset rule and the first TB, including:

When the first TB includes at least one media access control control element MAC CE, the first terminal device determines that the first CAPC is the CAPC with the highest priority among the CAPCs corresponding to the at least one MAC CE;

When the first TB does not include the at least one MAC CE and includes at least one sidelink control channel service data unit SCCH SDU, the first terminal device determines that the first CAPC is the at least one The CAPC with the highest priority among the CAPCs corresponding to SCCH SDU;

When the first TB does not include the at least one MAC CE and the at least one SCCH SDU, and includes at least one sidelink service channel service data unit STCH SDU, the first terminal device determines that the first One CAPC is the CAPC with the lowest priority among the CAPCs corresponding to the at least one STCH SDU.
The method of claim 3, wherein the first terminal device determines the first CAPC according to the first preset rule and the first TB, including:

The first terminal device determines that the first CAPC is the CAPC with the highest priority among CAPCs corresponding to at least one logical channel LCH and/or at least one media access control element MAC CE included in the first TB.
The method of claim 1, wherein the first terminal device determines the first CAPC, including:

The first terminal device determines that the CAPC corresponding to the first logical channel LCH or the first media access control control element MAC CE is the first CAPC, and the first LCH or the first MAC CE is used to trigger the The first terminal equipment selects or reselects SL resources, and there is a corresponding relationship between the first LCH or the first MAC CE and the CAPC.
The method according to any one of claims 1 to 6, characterized in that the first information includes first indication information, and the first indication information is used to instruct the second CAPC to be used for PSFCH transmission.
The method according to any one of claims 1 to 6, characterized in that the format of the first information is a first format, and the first format is used to indicate that the second CAPC is used for PSFCH transmission.
A communication method, characterized by including:

The second terminal device receives first information from the first terminal device, the first information being used to indicate the second channel access priority type CAPC;

The second terminal device performs listen-before-talk LBT for the first physical sidelink feedback channel PSFCH according to the second CAPC.
The method of claim 9, wherein the first information includes first indication information, and the first indication information is used to instruct the second CAPC to be used for PSFCH transmission.
The method of claim 9, wherein the format of the first information is a first format, and the first format is used to indicate that the second CAPC is used for PSFCH transmission.
The method according to any one of claims 9 to 11, characterized in that the first PSFCH is determined based on the mapping relationship between the physical sidelink shared channel PSSCH and the PSFCH, or the first PSFCH is the first terminal as indicated by the device.
The method according to any one of claims 9-12, wherein the second terminal device performs LBT for the first PSFCH according to the second CAPC, including:

The second terminal device determines a third CAPC based on the second CAPC;

The second terminal equipment performs LBT on the first PSFCH according to the third CAPC.
The method of claim 13, wherein the second terminal device determines the third CAPC based on the second CAPC, including:

When the second terminal device determines that the second CAPC is less than or equal to the first threshold, the second terminal device determines the third CAPC; or

When the second terminal device determines that the second CAPC is greater than the first threshold, the second terminal device determines the third CAPC.
The method according to any one of claims 9-14, characterized in that the method further includes:

The second terminal device determines a fourth CAPC based on the second CAPC;

The second terminal equipment performs LBT on the second PSFCH according to the fourth CAPC.
The method of claim 15, wherein the second terminal device determines a fourth CAPC based on the second CAPC, including:

The second terminal device subtracts M from the second CAPC to obtain the fourth CAPC, where M is an integer greater than or equal to 1.
The method according to claim 15 or 16, characterized in that the method further includes:

The second terminal device receives second information, and the second information is used to indicate determining the fourth CAPC based on the second CAPC, and performing LBT for the second PSFCH according to the fourth CAPC.
A communication method, characterized by including:

The second terminal device receives the side link control information SCI from the first terminal device;

When the second terminal device determines that the SCI does not indicate the channel access priority type CAPC, it performs listen-before-talk LBT for the first physical sidelink feedback channel PSFCH according to the predefined CAPC.
The method of claim 18, wherein the first PSFCH is determined by the second terminal equipment.
The method according to claim 18 or 19, characterized in that the method further includes:

The second terminal device determines a fifth CAPC based on the predefined CAPC;

The second terminal equipment performs LBT on the second PSFCH according to the fifth CAPC.
The method of claim 20, wherein the second terminal device determines the fifth CAPC according to the predefined CAPC, including:

The second terminal device subtracts S from the predefined CAPC to obtain the fifth CAPC, where S is an integer greater than or equal to 1.
The method according to claim 20 or 21, characterized in that the method further includes:

The second terminal device receives third information, and the third information is used to indicate determining the fifth CAPC based on the predefined CAPC, and performing LBT for the second PSFCH according to the fifth CAPC.
A communication device, characterized by comprising a module or unit for executing the method according to any one of claims 1-8.
A communication device, characterized by comprising a module or unit for executing the method according to any one of claims 9-17.
A communication device, characterized by comprising a module or unit for executing the method according to any one of claims 18-22.
A communication device characterized by a memory, a processor and a transceiver, wherein:

The transceiver is used for communication by the communication device;

The memory is used to store computer instructions;

The processor is configured to call computer instructions in the memory to execute the method according to any one of claims 1-8 through the transceiver.
A communication device characterized by a memory, a processor and a transceiver, wherein:

The transceiver is used for communication by the communication device;

The memory is used to store computer instructions;

The processor is configured to call computer instructions in the memory to execute the method according to any one of claims 9-17 through the transceiver.
A communication device characterized by a memory, a processor and a transceiver, wherein:

The transceiver is used for communication by the communication device;

The memory is used to store computer instructions;

The processor is configured to call computer instructions in the memory to execute the method according to any one of claims 18-22 through the transceiver.
A computer-readable storage medium, characterized in that computer-executable instructions are stored in the computer-readable storage medium, and when called by the computer, the computer-executable instructions execute any of claims 1-8. The method described in any one of the above, or the method described in any one of claims 9-17, or the method described in any one of claims 18-22.
A computer program product, characterized in that it contains instructions that, when run on a computer, cause the method of any one of claims 1-8 to be executed, or cause the method of claims 9-17 to be performed The method of any one of claims 18-22 is performed, or the method of any one of claims 18-22 is performed.
A chip, characterized in that the chip is coupled to a memory and is used to read and execute program instructions stored in the memory to implement the method as described in any one of claims 1-8, or to implement as The method of any one of claims 9-17, or the method of any one of claims 18-22.