COMMUNICATION METHOD AND TERMINAL DEVICE

Abstract

A communication method and a terminal device are provided. The communication method includes transmitting, by a first terminal device, a first sidelink channel to a second terminal device via a first sidelink, where the first sidelink channel includes first COT shared information, and the first COT shared information satisfies one or more of the following: the first COT shared information is carried in a first PSSCH of the first sidelink channel, the first COT shared information includes second COT shared information and third COT shared information, where the second COT shared information corresponds to a first communication mode, and the third COT shared information corresponds to a second communication mode.

Description

[Technical field]

[0001] The present application relates to the technical field of communications, and more particularly to a communication method and a terminal device. [Background technology]

[0002] In an unlicensed spectrum, a sidelink terminal device acquires channel resources through a mechanism such as Listen Before Talk (LBT), which the terminal device can use to conduct sidelink communications within a Channel Occupancy Time (COT).

[0003] Resources in the COT can also be shared with other terminal devices. How to implement COT sharing is an urgent problem to be solved. Summary of the Invention [Means for solving the problem]

[0004] The present application provides a communication method and a terminal device. Various aspects of the embodiments of the present application are described below.

[0005] According to a first aspect, there is provided a communication method, the method comprising: transmitting, by a first terminal device, a first sidelink channel to a second terminal device via a first sidelink, the first sidelink channel including first COT shared information, the first COT shared information satisfying one or more of the following: the first COT shared information is carried in a first physical sidelink shared channel (PSSCH) of the first sidelink channel; the first COT shared information includes second COT shared information and third COT shared information, the second COT shared information corresponds to a first communication mode, and the third COT shared information corresponds to a second communication mode.

[0006] According to a second aspect, there is provided a communication method, the method comprising: receiving, by a second terminal device, a first sidelink channel transmitted by a first terminal device via a first sidelink, the first sidelink channel including first COT shared information, the first COT shared information satisfying one or more of the following: the first COT shared information is carried in a first PSSCH of the first sidelink channel; the first COT shared information includes second COT shared information and third COT shared information, the second COT shared information corresponds to a first communication mode, and the third COT shared information corresponds to a second communication mode.

[0007] According to a third aspect, there is provided a communication method, the method comprising: transmitting, by a first terminal device, a first sidelink channel, the first sidelink channel including first COT sharing information, the first COT sharing information being used to indicate that the first terminal device has allocated a first resource in the COT to a second terminal device, the first resource being determined based on one or more of the following information: whether the second terminal device is a terminal device in a communication cluster in which the first terminal device is located, and a priority corresponding to the second terminal device.

[0008] According to a fourth aspect, there is provided a communication method, the method comprising: receiving, by a second terminal device, a first sidelink channel, the first sidelink channel including first COT sharing information, the first COT sharing information being used to indicate that the first terminal device has allocated a first resource in the COT to the second terminal device, the first resource being determined based on one or more of the following information: whether the second terminal device is a terminal device in a communication cluster in which the first terminal device is located, and a priority corresponding to the second terminal device.

[0009] According to a fifth aspect, a terminal device is provided, the terminal device being a first terminal device and including a communication module configured to transmit a first sidelink channel to a second terminal device via a first sidelink, the first sidelink channel including first COT shared information, the first COT shared information satisfying one or more of the following: the first COT shared information is carried in a first PSSCH of the first sidelink channel; the first COT shared information includes second COT shared information and third COT shared information, the second COT shared information corresponds to a first communication mode, and the third COT shared information corresponds to a second communication mode.

[0010] According to a sixth aspect, a terminal device is provided, the terminal device being a second terminal device and including a communication module configured to receive, via a first sidelink, a first sidelink channel transmitted by a first terminal device, the first sidelink channel including first COT shared information, the first COT shared information satisfying one or more of the following: the first COT shared information is carried in a first PSSCH of the first sidelink channel; the first COT shared information includes second COT shared information and third COT shared information, the second COT shared information corresponds to a first communication mode, and the third COT shared information corresponds to a second communication mode.

[0011] According to a seventh aspect, a terminal device is provided, the terminal device being a first terminal device and comprising: a communication module configured to transmit a first sidelink channel, the first sidelink channel comprising first COT sharing information, the first COT sharing information being used to indicate that the first terminal device has allocated a first resource in the COT to a second terminal device, the first resource being determined based on one or more of the following information: whether the second terminal device is a terminal device in a communication cluster in which the first terminal device is located; and a priority corresponding to the second terminal device.

[0012] According to an eighth aspect, a terminal device is provided, the terminal device being a second terminal device and including a communication module configured to receive a first sidelink channel, the first sidelink channel including first COT sharing information, the first COT sharing information being used to indicate that the first terminal device has allocated a first resource in the COT to the second terminal device, the first resource being determined based on one or more of the following information: whether the second terminal device is a terminal device in a communication cluster in which the first terminal device is located, and a priority corresponding to the second terminal device.

[0013] According to a ninth aspect, there is provided a communication device, the communication device including a memory and a processor, the memory configured to store a program, and the processor configured to invoke the program in the memory to perform a method according to any one of the first to fourth aspects.

[0014] According to a tenth aspect, there is provided an apparatus, the apparatus including a processor configured to call a program from a memory to perform a method according to any one of the first to fourth aspects.

[0015] According to an eleventh aspect, there is provided a chip, the chip including a processor configured to call a program from a memory and cause a device in which the chip is installed to perform a method according to any one of the first to fourth aspects.

[0016] According to a twelfth aspect, there is provided a computer readable storage medium, the computer readable storage medium storing a program for causing a computer to perform a method according to any one of the first to fourth aspects.

[0017] According to a thirteenth aspect there is provided a computer program product, the computer program product comprising a program for causing a computer to carry out a method according to any one of the first to fourth aspects.

[0018] According to a fourteenth aspect there is provided a computer program causing a computer to carry out a method according to any one of the first to fourth aspects.

[0019] In an embodiment of the present application, when a first terminal device performs sidelink communication with a second terminal device, the COT shared information is carried in a sidelink channel. The sharing method of the COT shared information proposed in the embodiment of the present application helps to improve the utilization rate of sidelink channel resources. [Brief description of the drawings]

[0020] [Figure 1] 1 is an example diagram of a wireless communication system to which embodiments of the present application are applicable. [Diagram 2] FIG. 1 is an exemplary diagram of NR-V2X communication. [Diagram 3] FIG. 13 is a schematic structural diagram of a single slot of a sidelink resource pool. [Figure 4] FIG. 2 is a schematic diagram of a frame structure that does not carry a PSFCH. [Diagram 5] FIG. 2 is a schematic diagram of a frame structure carrying the PSFCH; [Figure 6] 2 is a schematic diagram of an interaction between terminal devices in a communication method according to an embodiment of the present application; [Figure 7] FIG. 2 is a schematic diagram of a frame structure including COT-SI and not carrying PSFCH according to an embodiment of the present application; [Figure 8] FIG. 2 is a schematic diagram of a frame structure including a COT-SI and carrying a PSFCH according to an embodiment of the present application; [Figure 9] FIG. 2 is a schematic diagram of a frame structure having a COT-SI divided into two parts and not carrying a PSFCH according to an embodiment of the present application; [Figure 10] FIG. 2 is a schematic diagram of a frame structure having a COT-SI divided into two parts and carrying a PSFCH according to an embodiment of the present application; [Figure 11] 1 is a schematic structural diagram of a COT resource obtained by a terminal device through LBT; [Figure 12] 4 is a schematic diagram of communication between terminal devices in a communication method according to another embodiment of the present application; [Figure 13] FIG. 2 is an exemplary diagram of a system for unicast communication in SL-U. [Figure 14] FIG. 2 is an exemplary diagram of a system for groupcast communication in SL-U. [Figure 15] FIG. 2 is a schematic structural diagram of a terminal device according to an embodiment of the present application; [Figure 16] 1 is a schematic structural diagram of a communication device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The technical solutions of the embodiments of the present application are clearly and completely described below with the accompanying drawings. Of course, the described embodiments are only some, not all, of the embodiments of the present application. In order to facilitate understanding, the terms and communication processes involved in the present application are first described below with reference to Figures 1 to 5.

[0022] 1 is an example diagram of a system architecture of a wireless communication system 100 to which an embodiment of the present application is applicable. The wireless communication system 100 may include a network device 110 and terminal devices 121 to 129. The network device 110 may provide communication coverage to a particular geographic area and may communicate with terminals within the coverage area.

[0023] In some implementations, terminal devices may communicate with each other through a sidelink (SL), which may also be referred to as proximity services (ProSe) communication, unidirectional communication, side link communication, device-to-device (D2D) communication, etc.

[0024] In other words, sidelink data is transmitted between terminal devices via a sidelink. The sidelink data may include data and / or control signaling. In some implementations, the sidelink data may be, for example, a physical sidelink control channel (PSCCH), a PSSCH, a PSCCH demodulation reference signal (DMRS), a PSSCH DMRS, or a physical sidelink feedback channel (PSFCH).

[0025] Some common sidelink communication scenarios are described below with reference to Fig. 1. Depending on whether the terminal devices in the sidelink are within the coverage of the network device, the sidelink communication may include three scenarios: in scenario 1, the terminal devices perform sidelink communication within the coverage of the network device; in scenario 2, some of the terminal devices perform sidelink communication within the coverage of the network device; and in scenario 3, the terminal devices perform sidelink communication outside the coverage of the network device.

[0026] 1, in scenario 1, terminal devices 121 and 122 can communicate with each other via a sidelink, and terminal devices 121 and 122 are both within the coverage of network device 110, or in other words, terminal devices 121 and 122 are both within the coverage of the same network device 110. In this scenario, network device 110 may send configuration signaling to terminal devices 121 and 122, and thus terminal devices 121 and 122 communicate with each other via a sidelink based on the configuration signaling.

[0027] As shown in FIG. 1, in scenario 2, terminal devices 123 and 124 can communicate with each other via a sidelink, where terminal device 123 is within the coverage of network device 110, but terminal device 124 is outside the coverage of network device 110. In this scenario, terminal device 123 receives configuration information from network device 110 and communicates via the sidelink based on the configuration of the configuration signaling. However, since terminal device 124 is outside the coverage of network device 110, terminal device 124 cannot receive configuration information from network device 110. In this case, terminal device 124 may obtain a configuration for sidelink communication based on preconfigured configuration information and / or configuration information sent by terminal device 123 in coverage, to communicate with terminal device 123 via the sidelink based on the obtained configuration.

[0028] In some cases, the terminal device 123 may transmit configuration information to the terminal device 124 over a physical sidelink broadcast channel (PSBCH) to configure the terminal device 124 to communicate via the sidelink.

[0029] 1, in scenario 3, terminal devices 125 to 129 are all outside the coverage of network device 110 and cannot communicate with network device 110. In this case, all terminal devices may implement sidelink communication based on pre-configuration information.

[0030] In some cases, terminal devices 127 to 129 outside the coverage of a network device may form a communication cluster, and terminal devices 127 to 129 in the communication cluster may communicate with each other. In addition, terminal device 127 in the communication cluster may act as a central control node, also called a cluster header (CH). Correspondingly, other terminal devices in the communication cluster may be called "cluster members."

[0031] The terminal device 127 as a CH may have one or more of the following functions: being responsible for establishing a communication cluster; joining and leaving cluster members; resource coordination, allocating sidelink transmission resources for cluster members and receiving sidelink feedback information from cluster members; resource coordination with other communication clusters; and other functions.

[0032] It should be noted that Fig. 1 illustrates a network device and multiple terminal devices as an example. Optionally, the wireless communication system 100 may include multiple network devices, and another number of terminal devices may be included in the coverage of each network device, which is not limited in this embodiment of the present application.

[0033] Optionally, the wireless communication system 100 may further include other network entities, such as a network controller and a mobility management entity, which is not limited in this embodiment of the present application.

[0034] It should be understood that the technical solutions in the embodiments of the present application can be applied to various communication systems, such as a fifth generation (5G) system or a new radio (NR) system, a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, and an LTE time division duplex (TDD). The technical solutions provided in the present application can also be applied to future communication systems, such as a sixth generation mobile communication system and a satellite communication system.

[0035] The terminal device in the embodiment of the present application may also be referred to as a user equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of the present application may be a device capable of providing voice and / or data connectivity to a user and connecting people, objects, and machines such as handheld devices or in-vehicle devices with wireless connectivity capabilities. The terminal device in the embodiment of the present application may be a mobile phone, a tablet computer (pad), a notebook computer, a palmtop computer, a mobile internet device (MID), a wearable device, a vehicle, a wireless terminal in industrial control, a wireless terminal in autonomous driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. Optionally, the terminal device may be used to act as a base station. For example, the terminal device may act as a scheduling entity providing sidelink signals between terminal devices in Vehicle-to-Everything (V2X) or D2D, etc. For example, cellular phones and cars communicate with each other using sidelink data, cellular phones and smart home devices communicate with each other without relaying communication signals through a base station.

[0036] The network device in the embodiment of the present application may be a device for communicating with a terminal device. The network device may also be referred to as an access network device or a wireless access network device. For example, the network device may be a base station. The network device in the embodiment of the present application may be a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. The base station may broadly cover various names in the following, or may be interchangeable with the following names, for example, Node B, evolved Node B (eNB), next generation Node B (gNB), relay station, transmit reception point (TRP), transmit point (TP), access point (AP), master eNB MeNB, secondary eNB SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, radio node, transmit node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), and positioning node. The base station may be a macro base station, a micro base station, a relay node, a donor node, etc., or a combination thereof. Alternatively, the base station may be a communication module, modem, or chip disposed in the device or apparatus described above. Alternatively, the base station may be a mobile switching center, a device performing the function of a base station in D2D, V2X, and machine-to-machine (M2M) communications, a network side device in a 6G network, a device performing the function of a base station in future communication systems, etc. The base station may support networks of the same or different access technologies. The specific technology and the specific device form used by the network device are not limited in the embodiments of the present application.

[0037] The base station may be fixed or mobile. For example, a helicopter or a drone may be configured to act as a mobile base station, and one or more cells may move according to the location of the mobile base station. In another example, a helicopter or a drone may be configured to act as a device in communication with another base station.

[0038] In some deployments, the network device in the embodiment of the present application may be a CU or a DU, or the network device includes a CU and a DU. The gNB may further include an AAU.

[0039] The network device and the terminal device may be deployed on land, including indoors or outdoors, handheld or vehicle-mounted, or on water, or on aircraft, balloons, and satellites in the sky. In the embodiment of the present application, the scenario of where the network device and the terminal device are located is not limited.

[0040] It should be understood that all or part of the functionality of the communication device in this application may also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (such as a cloud platform).

[0041] Communication Modes for Sidelink With the development of sidelink communication technology, the sidelink communication technology is related to information exchange between various terminal devices. Taking the V2X communication system 200 shown in Fig. 2 as an example, the vehicle-to-vehicle (V2V) communication between the terminal device 201 and the terminal device 202 is related to information exchange between the vehicles themselves. The vehicle-to-infrastructure (V2I) communication, the vehicle-to-network (V2N) communication, and the vehicle-to-pedestrian (V2P) communication between the terminal device 201 and the terminal devices 203 to 205 are related to information exchange between the vehicles and external systems, respectively.

[0042] The gradual expansion of the information exchange range imposes higher requirements on the communication system. For example, the communication system is required to support higher throughput, lower latency, higher reliability, larger coverage, more flexible resource allocation, etc. Taking the development of V2X as an example, in LTE-V2X, only the broadcast mode is supported between terminal devices for sidelink communication. In NR-V2X, three communication modes can be supported: broadcast, groupcast, and unicast.

[0043] Broadcast is the most basic communication mode in sidelink communication. In the case of the broadcast transmission mode, the sidelink data can be received by any terminal device around the terminal device as a transmitter end. For example, referring to FIG. 1, assuming that the terminal device 125 transmits sidelink data in the broadcast mode as a transmitter end, any of the terminal devices 121 to 124 and the terminal devices 126 to 129 around the terminal device 125 can be used as a receiver end of the sidelink data.

[0044] Groupcast communication is used to support information exchange between terminal devices in a particular group (or called communication cluster) to assist negotiation and decision-making between the terminal devices in that group. Sidelink groupcast has two transmission types. Type 1 is for managed groups with stable connection relationships, with clear ID information and group member information. Type 2 is for connectionless groups formed in a connectionless manner, e.g., dynamically formed groupcast based on distance, where the communication distance of the current service needs to be clearly indicated.

[0045] In the case of a groupcast transmission mode, the sidelink data may be received by all terminal devices in the communication cluster. Alternatively, the sidelink data may be received by all terminal devices within a certain transmission distance. For example, referring to FIG. 1, for a communication cluster including terminal devices 127 to 129, when terminal device 127 transmits sidelink data in groupcast mode, all other terminal devices 128 and 129 in the communication cluster are terminal devices that receive the sidelink data. In another example, referring to FIG. 1, assuming that terminal devices within a pre-configured range include terminal devices 127 to 129, when terminal device 127 transmits sidelink data in a groupcast manner, all other terminal devices 128 and 129 within the pre-configured range are terminal devices that receive the sidelink data.

[0046] Unicast communication enables sidelink communication between two terminal devices. Taking NR-V2X as an example, Radio Resource Control (RRC) signaling based on the PC5 interface enables reliable communication between one terminal device and another.

[0047] In the case of a unicast transmission mode, there is usually only one terminal device that receives the sidelink data. Referring to FIG. 1, the terminal device 121 and the terminal device 122 may communicate in a unicast transmission mode. For example, when the terminal device 121 performs sidelink communication with the terminal device 122, the terminal device 122 receives the sidelink data as the only receiving device. The sidelink data may include a PSSCH and a PSCCH. Through demodulation, the terminal device 122 can obtain sidelink control information (SCI) related to sidelink transmission and scheduling. The SCI can help the terminal device 122 receive and decode the sidelink information.

[0048] In some communication systems (e.g., NR-V2X), sidelink unicast and groupcast services support a hybrid automatic repeat request (HARQ) mechanism with acknowledgement (ACK) / negative acknowledgement (NACK). For groupcast services, NACK-only HARQ may also be used. In addition, a blind retransmission mechanism is further supported. Sidelink HARQ feedback is transmitted on the PSFCH by a terminal device at the receiver end to a terminal device at the transmitter end.

[0049] Resource Pool for Sidelinks In some communication systems (e.g., NR), two resource configuration modes for sidelink resources are defined: mode 1 and mode 2. In mode 1, a network device schedules sidelink resources for terminal devices. For example, in FIG. 1, terminal devices 121 to 123 are within the coverage of network device 110, and network device 110 may allocate sidelink resources for terminal devices 121 to 123.

[0050] In Mode 2, the terminal device independently selects sidelink resources in the resource pool. In this mode, the process implemented by the terminal device includes a resource probing process and / or a resource selection process. In the resource probing process, the terminal device may detect the occupancy of the sidelink resources by demodulating the SCI. Alternatively, the terminal device may detect the occupancy of the sidelink resources by measuring the received power of the sidelink. For example, the terminal devices 124 to 129 in FIG. 1 are outside the coverage of the network device 110, and each of the terminal devices 124 to 129 may independently select a sidelink resource in Mode 2.

[0051] The sidelink resource pool to which the embodiments of the present application are applicable is described below by taking the NR-V2X resource pool as an example with reference to Fig. 3. A subchannel can be understood as the smallest granularity of PSSCH resource allocation specified in NR-V2X. As shown in Fig. 3, the sidelink resource pool includes M subchannels, namely subchannel 0, subchannel 1, ... and subchannel M-1. Each subchannel is a subchannel with N SubCHsize may be composed of N physical resource blocks (PRBs), where SubCHsize The value of is 10, 12, 15, 20, 25, 50, 75, or 100. In the time domain, the terminal device receives M × N SubCHsize It may be composed of M×N PRBs. SubCHsize PRBs can be used for one transmission. If the resource pool contains T slots, the resource pool from which the terminal device can independently select is M×N SubCHsize ×T PRBs.

[0052] Taking unicast communication between terminal device A and terminal device B as an example, in a resource pool, terminal device A as a transmitter end may sequentially select resources for sidelink communication with terminal device B at the receiver end. For example, terminal device A may directly implement sidelink communication with terminal device B on a portion of frequency resources in the same slot or in the next slot. Alternatively, terminal device A may select a portion of resources in each subchannel of each slot for sidelink communication with terminal device B.

[0053] System frame structure for side links The frame structure (slot structure) of a sidelink system frame to which the embodiments of the present application are applicable is described below with reference to Figures 4 and 5. The system frame is a single slot containing 14 time domain symbols. Figure 4 shows the frame structure of a system frame that does not carry a PSFCH. Figure 5 shows the frame structure of a system frame that carries a PSFCH.

[0054] The SCI in Figures 4 and 5 consists of two parts: a first stage SCI-1 and a second stage SCI-2. The first stage SCI-1 is transmitted on the PSCCH and the second stage SCI-2 is transmitted on the PSSCH.

[0055] Referring to FIG. 4, in the time domain, SCI-1 transmitted on the PSCCH occupies two or three sidelink symbols starting from the second sidelink symbol (e.g., Orthogonal Frequency Division Multiplexing (OFDM) symbol) of the system frame. The transmission of the PSCCH at the start position of the slot helps the PSCCH to be acquired by the terminal device as the receiver end in advance, thereby reducing the power consumption of the terminal device. In the frequency domain, the PSCCH may occupy multiple PRBs. Usually, only one configuration of the number of PSCCH symbols and the number of PRBs is allowed in one resource pool to reduce the complexity of blind detection of the PSCCH by the terminal device.

[0056] Still referring to Figure 4, in the time domain, the SCI-2 transmitted on the PSSCH also starts from the second sidelink symbol of the system frame and ends with the penultimate sidelink symbol of the system frame. In the frequency domain, the PSSCH occupies multiple subchannels of the system frame. As shown in Figure 3, each subchannel includes N consecutive PRBs.

[0057] Thus, a portion of the PSCCH and its associated PSSCH are transmitted on resources that overlap in time but not in frequency, and other portions of the PSSCH and PSCCH are transmitted on resources that do not overlap in time.

[0058] Typically, the first sidelink symbol in a slot is a repetition of the second sidelink symbol. When a terminal device receives a system frame, the first sidelink symbol may be used as an automatic gain control (AGC) symbol. The data on the AGC symbol is typically not used for data demodulation. The last symbol in a slot is a guard gap GAP symbol.

[0059] Referring to Figure 5, when the PSFCH channel is carried in a slot, the penultimate and third-last sidelink symbols in the system frame are used for PSFCH transmission. In addition, a GAP symbol needs to be reserved after both PSSCH and PSFCH. The value range of the PSFCH resource pre-configuration period can be {1, 2, 4} slots.

[0060] Communications spectrum for sidelink The spectrum used by the communication system includes licensed spectrum and unlicensed spectrum. An important direction of the expansion of the communication system to different fields is the use of the unlicensed spectrum. For example, NR deployed on the unlicensed spectrum is called NR-U.

[0061] Currently, sidelink mainly uses licensed spectrum. Sidelink may also use unlicensed spectrum. Sidelink deployed on unlicensed spectrum is sometimes referred to as SL-U.

[0062] Compared with licensed spectrum, unlicensed spectrum has the ability to be shared without licenses. For operators, spectrum sharing can facilitate spectrum aggregation in a timely manner to dynamically support high-bandwidth services. Spectrum sharing can also extend the benefits of communication technologies (e.g., NR) to operating entities that cannot access licensed spectrum.

[0063] The unlicensed spectrum must allow for the coexistence of different radio access technology (RAT) systems, typically Wireless Fidelity (Wi-Fi) systems and LTE-based Licensed Assisted Access (LAA) systems. Different systems use frequency bands in the unlicensed spectrum in a spectrum contention manner, following the principles of channel access fairness and multi-RAT coexistence.

[0064] In the unlicensed spectrum, any RAT system needs to carry out communication under the constraints of the unlicensed spectrum regulatory rules. The regulatory rules include power levels and power spectral density levels, maximum COT, channel occupied bandwidth, and channel monitoring mechanisms. In the same frequency band, each system needs to meet the requirements of the regulatory rules and occupy and release channels reasonably so as not to cause interference to another RAT system in the same frequency band. For example, to support different RATs in the unlicensed spectrum, communication between sidelink terminal devices is subject to the above-mentioned regulatory rules.

[0065] For the use of unlicensed spectrum, the RAT system may employ mandatory channel monitoring techniques (e.g., LBT) to access the network. In other words, data can be transmitted only when it is detected that the current channel is not occupied. For example, the sidelink terminal device may initiate the LBT, which may be a Category 2 (Cat 2) LBT or a Category 4 (Cat 4) LBT.

[0066] After obtaining the channel resource through LBT, the terminal device may perform corresponding detection and transmit data according to the above-mentioned restriction rules. For example, when the terminal device transmits data through the channel resource, the COT restriction needs to be met. In other words, continuous data transmission should be limited within the COT time, and when this time is exceeded, the terminal device needs to release the channel and perform LBT again.

[0067] Based on the above description, it can be seen that in an unlicensed spectrum, a sidelink terminal device obtains a sidelink channel resource through LBT. Based on the constraints of the unlicensed spectrum regulatory rules, the terminal device can obtain the COT information of the sidelink channel resource.

[0068] Within the COT, the direction of data transmission may change. A terminal device that obtains COT information may use resources in the COT to transmit data to a terminal device at the receiver end of the sidelink, and the terminal device at the receiver end may also use its resources to transmit data to a terminal device at the transmitter end. If the resources in the COT are not exhausted, the remaining COT resources may also be shared with other sidelink terminal devices. Thus, the terminal device may implement COT sharing with other terminal devices based on the COT information to avoid resource waste.

[0069] How to implement COT sharing is an urgent problem to be solved. A communication method according to an embodiment of the present application is described below with reference to Figure 6. The sharing method of COT sharing information proposed in this method improves the utilization rate of sidelink channel resources.

[0070] The communication method shown in Fig. 6 is described in terms of interaction between a first terminal device and a second terminal device. The first terminal device and the second terminal device in Fig. 6 may be two terminals in sidelink communication, for example a vehicle and a pedestrian or two vehicles in V2X. The first terminal device may be a transmitting terminal of the sidelink and the second terminal device may be a receiving terminal. Alternatively, the first terminal device may be a receiving terminal of the sidelink and the second terminal device may be a transmitting terminal.

[0071] The first terminal device may perform unicast communication, groupcast communication, or broadcast communication with the second terminal device. When the first terminal device performs unicast communication, the second terminal device may be a receiving terminal. When the first terminal device performs groupcast communication, the second terminal device may be a receiving terminal in a communication cluster.

[0072] Referring to Figure 6, the first terminal device and the second terminal device interact through a first sidelink channel. The first terminal device may transmit the first sidelink channel to the second terminal device via the first sidelink, and the second terminal device receives the first sidelink channel. Alternatively, the second terminal device transmits the first sidelink channel to the first terminal device, and the first terminal device receives the first sidelink channel.

[0073] The first sidelink channel may include one or more of the channels such as PSCCH, PSSCH, and PSFCH.

[0074] As shown in Figure 6, the first sidelink channel further includes a first COT shared information (COT-SI), which may be used to share resources (time domain resources and / or frequency domain resources) in the COT with other terminal devices.

[0075] In some embodiments, the first COT sharing information may be carried in a PSCCH, which is located before a slot, so that another terminal device can obtain the first COT sharing information as early as possible.

[0076] In some embodiments, the first COT shared information may be carried in the PSSCH. The first COT shared information may be transmitted with a portion of the PSSCH on resources that overlap in time but do not overlap in frequency.

[0077] The first COT shared information may occupy one symbol or multiple symbols, for example, two consecutive symbols.

[0078] The first COT shared information may be located on any symbol of the PSSCH. For example, the first COT shared information may be located on a symbol adjacent to the SCI, or may be located on a symbol not adjacent to the SCI. This will be described in detail below with reference to Figures 7 to 10 using an example in which the time domain resources on which the first COT shared information and the SCI are located are adjacent.

[0079] The first COT shared information may include various types of COT shared information. The multiple types of COT shared information may have a one-to-one correspondence with multiple communication modes. For example, when the first COT shared information includes the second COT shared information and the third COT shared information, the second COT shared information may correspond to the first communication mode, and the third COT shared information may correspond to the second communication mode.

[0080] The first communication mode or the second communication mode may be one of a plurality of transmission modes of the sidelink, which is not limited in this specification. For example, the first communication mode may be unicast communication or groupcast communication.

[0081] In some embodiments, the first COT sharing information may include second COT sharing information. The first communication mode corresponding to the second COT sharing information may be unicast communication. The second COT sharing information corresponds to unicast communication, i.e., the second COT sharing information is COT sharing information for unicast communication. For example, the second COT sharing information may indicate one or more sharable resources, where the one or more resources can be shared for use by terminal devices based on unicast communication on other sidelinks. In some embodiments, the second COT sharing information may include COT-SI unicast It is represented by:

[0082] In some embodiments, the first COT sharing information may include third COT sharing information. The second communication mode corresponding to the third COT sharing information may be groupcast communication. The third COT sharing information corresponds to groupcast communication, i.e., the third COT sharing information is COT sharing information for groupcast communication. For example, the third COT sharing information may indicate one or more sharable resources, where the one or more resources may be shared for use by other terminal devices in the same communication cluster as the first terminal device. In some embodiments, the third COT sharing information may include COT-SI cast It is represented by:

[0083] In some embodiments, the first COT shared information may include both the second COT shared information and the third COT shared information described above.

[0084] In some embodiments, the first COT sharing information may include information indicating a start time and an end time of the COT of the first terminal device. For example, the first COT sharing information may include a start time and an end time of the COT. In another example, the first COT sharing information may include a start time and a duration of the COT.

[0085] In some embodiments, the first COT sharing information may further be used to indicate various types of resource information. For example, the first COT sharing information may indicate the LBT bandwidth supported in the COT. In another example, the first COT sharing information may indicate unused resources in the COT. The unused resources are the remaining resources in the current COT. In another example, the first COT sharing information may indicate resources permitted for use by a third terminal device participating in the COT sharing. In the case of a third terminal device, the third terminal device may participate in the sharing of COT resources by detecting the first COT sharing information.

[0086] Based on the information or resources indicated by the COT sharing information and the communication mode corresponding to the COT sharing information, the first terminal device can reasonably allocate resources in the COT to other terminal devices. For example, the resources may be allocated based on the priorities of the other terminal devices. This will be described in detail below.

[0087] As can be seen from Figure 6, the first COT sharing information is carried in the first sidelink channel, and the sidelink terminal device can obtain various indication information of the shared resources in the COT. Based on the indication information, the terminal device can specify the duration of COT sharing and the remaining resources, so as to more rationally and effectively utilize the sidelink channel resources corresponding to the COT sharing information.

[0088] As mentioned above, the first COT shared information (COT-SI) may be carried in the PSSCH of the first sidelink channel. Taking the COT-SI adjacent to the SCI as an example, different frame structures including the COT-SI are described in detail below with reference to Figures 7 to 10, respectively. Figure 7 is a schematic diagram of a frame structure including the COT-SI and not carrying the PSFCH. Figure 8 is a schematic diagram of a frame structure including the COT-SI and carrying the PSFCH.

[0089] The SCI includes the SCI-1. The COT-SI is adjacent to the SCI, which may mean that the time domain resources of the COT-SI and the SCI-1 are adjacent. If the last symbol where the SCI-1 is located is set as the first symbol, the time domain resource where the COT-SI is located is one symbol or multiple consecutive symbols following the first symbol.

[0090] As shown in Figures 7 and 8, COT-SI occupies two consecutive symbols. SCI-1 is located on the second symbol to the fourth symbol of the frame structure, and the fourth symbol can be the first symbol. COT-SI is located on the fifth and sixth symbols. In other words, the time domain resources of COT-SI and SCI-1 are adjacent.

[0091] Compared with the above FIG. 4 and FIG. 5, in the time domain, the terminal device can obtain the indication information of COT-SI on the next symbol immediately after demodulating the PSCCH.

[0092] As described above, the COT-SI may further include the second COT shared information and the third COT shared information. The second COT shared information and the third COT shared information may be transmitted as a whole in the manner shown in Figure 7 or Figure 8, or each may be transmitted on one or more symbols. Figure 9 is a schematic diagram of a frame structure having a COT-SI divided into two parts and not carrying a PSFCH. Figure 10 is a schematic diagram of a frame structure having a COT-SI divided into two parts and carrying a PSFCH.

[0093] The second COT shared information and the third COT shared information may each occupy one or more symbols. The first sidelink channel includes SCI-1 and SCI-2. The second COT shared information may be adjacent to the time domain resource where SCI-1 is located, and the third COT shared information may be adjacent to the time domain resource where SCI-2 is located. Alternatively, the third COT shared information may be adjacent to the time domain resource where SCI-1 is located, and the second COT shared information may be adjacent to the time domain resource where SCI-2 is located.

[0094] As shown in Figures 9 and 10, the two parts of COT-SI are the second COT shared information and the third COT shared information, each occupying one symbol. The last symbol of SCI-1 is the fourth symbol, and the second COT shared information or the third COT shared information is located on the fifth symbol adjacent to the time domain resource where SCI-1 is located. The last symbol of SCI-2 is the third symbol, and the third COT shared information or the second COT shared information is located on the fourth symbol adjacent to the time domain resource where SCI-2 is located.

[0095] In Figures 9 and 10, the second COT shared information is COT-SI unicast The third COT shared information is COT-SI cast If so, COT-SI unicast and COT-SI cast Each of the COT-SIs is represented by one symbol adjacent to the SCI. By demodulating the SCI, the terminal device can obtain the indication information of the COT-SIs corresponding to the unicast and groupcast, respectively, as soon as possible.

[0096] An example of the interaction between the first terminal device and the second terminal device through the first sidelink channel and the design of the frame structure of the first COT sharing information in the first sidelink channel is described above using Figures 6 to 10. The first COT sharing information is used to indicate the status of resources that may be shared in the COT. The status of resources in the COT sharing is described in detail below with reference to Figure 11.

[0097] As shown in Figure 11, after the LBT, the terminal device may obtain a channel resource in the COT. In the frequency domain, the channel resource includes a number of subchannels as shown in Figure 3. In the time domain, the channel resource includes T slots in the COT. There are M subchannels, and each subchannel has N SubCHsize When the PRBs are included, the total size of the COT shared resources initiated by the terminal device is M × N SubCHsize ×T PRBs.

[0098] In the sidelink groupcast and unicast communication modes, after the resources in the COT have been used for communication between the terminal devices in the communication cluster, there may be remaining unused resources, which may be shared with other sidelink terminal devices outside the communication cluster, as explained above, to improve the utilization of the sidelink channel resources in the COT.

[0099] Furthermore, if multiple sidelinks are to join or the remaining resources in the COT cannot satisfy the requirements of all sidelinks, then consideration needs to be given to how to allocate resources to avoid collisions.

[0100] In order to better utilize the resources in the COT, a communication method provided in another embodiment of the present application can rationally allocate the resources in the COT based on the COT shared information.

[0101] A communication method according to another embodiment of the present application is described below with reference to Fig. 12. The communication method shown in Fig. 12 is described in terms of a first terminal device transmitting a first sidelink channel to a second terminal device and the second terminal device receiving the first sidelink channel. The first terminal device and the second terminal device in Fig. 12 may be two terminals in a sidelink communication, for example, a vehicle and a pedestrian or two vehicles.

[0102] The difference from Figure 6 is that the first terminal device is a sidelink transmitting terminal and the second terminal device is a receiving terminal. In some embodiments, the first terminal device obtains resources in the COT through the LBT, and the first terminal device may also be called an initiator terminal of the COT sharing.

[0103] The second terminal device may be one or more receiving terminals on the sidelink transmitting the first sidelink channel, or may be one or more terminal devices on another sidelink. In other words, the second terminal device may be a terminal device in the communication cluster in which the first terminal device is located, or may be a terminal device outside the communication cluster in which the first terminal device is located. For the sake of brevity, in the following description, an intra-cluster terminal device is used to represent a second terminal device in the communication cluster in which the first terminal device is located, and an out-cluster terminal device is used to represent a second terminal device outside the communication cluster in which the first terminal device is located.

[0104] In some embodiments, the second terminal device may be an intra-cluster terminal device. The second terminal device may receive the first sidelink channel via a sidelink of the first terminal device.

[0105] In some embodiments, the second terminal device may be an out-cluster terminal device. The second terminal device may receive the first sidelink channel through detection, e.g., detection of sidelink sharing by the second terminal device through LBT.

[0106] The intra-cluster terminal device may be a terminal device at the receiver end in unicast communication, or may be multiple terminal devices in groupcast communication. The extra-cluster terminal device may be one or more terminal devices outside the unicast and / or groupcast communication cluster. The intra-cluster terminal device and the extra-cluster terminal device in this embodiment of the present application are described based on the unicast communication mode and the groupcast communication mode with reference to Figures 13 and 14, respectively.

[0107] The first sidelink channel also includes first COT sharing information, which may be further used to indicate that the first terminal device has allocated first resources in the COT to the second terminal device.

[0108] When the first COT sharing information includes the second COT sharing information and the third COT sharing information, the second COT sharing information and the third COT sharing information may indicate a first resource based on a corresponding communication mode. In some embodiments, when the first communication mode corresponding to the second COT sharing information is unicast, the first resource indicated by the second COT sharing information may be allocated to the corresponding terminal device. Other terminal devices can also detect the COT sharing information. In some embodiments, when the second communication mode corresponding to the third COT sharing information is groupcast, the first resource indicated by the third COT sharing information is allocated only to the cluster members. In other words, the first resource indicated by the COT sharing information for groupcast communication may be dedicated to the cluster members, and the cluster outside terminal devices cannot communicate through the resource.

[0109] The first COT sharing information may indicate various types of information about the first resource. In some embodiments, the first COT sharing information may indicate a time domain and / or a frequency domain resource in the COT that is allocated to the second terminal device. In some embodiments, as an alternative, the first COT sharing information may indicate an allowed duration of use of the first resource. In some embodiments, as an alternative, the first COT sharing information may indicate a time during which a second terminal device outside the communication cluster is allowed to access via the first resource.

[0110] A first terminal device allocating a first resource in the COT to a second terminal device may mean that the first terminal device allocates the resource to an in-cluster terminal device, or that the first terminal device allocates the remaining unused resources in the COT to an out-cluster terminal device.

[0111] The first resource allocated by the first terminal device may be determined based on various types of information, such as whether the second terminal device is a terminal device in a communication cluster in which the first terminal device is located, a priority corresponding to the second terminal device, and a type and priority of the second terminal device.

[0112] As a possible implementation, when the second terminal device is a cluster terminal device, the first terminal device may allocate the first resource based on a cluster priority scheme. In other words, the cluster members have the highest priority, and the resources in the COT are preferentially allocated to the cluster members. In some embodiments, the first resource is allocated to one or more cluster terminal devices in the simplest scheme. For example, in groupcast communication, the first terminal device may allocate time domain resources to the second terminal device according to a sequence of slots, and may also allocate frequency resources in different subchannels in the same slot.

[0113] In some embodiments, the intra-cluster terminal device may transmit the PSFCH to the first terminal device via the first resource. If the number of NACKs fed back by the second terminal device on the sidelink reaches a certain value, the first terminal device triggers a retransmission and still preferentially allocates resources to the second terminal device. In some embodiments, if the number of NACKs fed back by the second terminal device is greater than a first threshold, the first terminal device allocates resources for retransmission from resources in the COT to the second terminal device. The first threshold may be a positive integer, for example, 3.

[0114] As a possible implementation, when the second terminal device is an out-of-cluster terminal device, the first resource may be allocated based on a priority corresponding to the second terminal device. The priority corresponding to the second terminal device may be determined based on a first parameter. The first parameter may be related to one or more of the following information: a sidelink corresponding to the second terminal device, a resource required by the second terminal device, a queue in which the second terminal device is located, a waiting time of the second terminal device for resource allocation from the first terminal device, and a NACK fed back by the second terminal device to the first terminal device.

[0115] The first parameter may be a specific parameter of the above-mentioned information related to the priority of the second terminal device, or may be data that directly indicates the priority and is derived from a specific parameter of one or more types of information above, or may be data derived from a plurality of specific parameters of the information, which is not limited in this specification.

[0116] In some embodiments, the first parameter may be determined based on related information of a sidelink corresponding to the second terminal device to indicate a priority of the second terminal device. The related information is, for example, a signal quality of the sidelink. The signal quality may be determined based on parameters such as a Reference Signal Received Power (RSRP), a Reference Signal Received Quality (RSRQ), and / or a Signal to Interference and Noise Ratio (SINR) of the sidelink. The first terminal device may compare the signal qualities of different sidelinks or compare the signal quality of the sidelink with a specified threshold to determine a priority corresponding to the second terminal device.

[0117] Taking RSRP as an example, the higher the RSRP, the shorter the communication distance, or the better the communication environment, the better the resources in the COT can provide services to the corresponding terminal device. Therefore, the first terminal device can set a threshold RSRP target The RSRP of the sidelink corresponding to the second terminal device may be set to RSRP target If the second terminal device has a higher priority than the first terminal device, the second terminal device may have a higher priority.

[0118] In some embodiments, the first parameter may be determined based on resource information required by the second terminal device. The resource information may be the size of the COT resource required by the second terminal device, or the type of the COT resource, etc. For example, a second terminal device that requires a smaller COT resource may have a higher priority.

[0119] In some embodiments, the first parameter may be determined based on relevant information of the queue in which the second terminal device is located. If multiple sidelinks are to share COT resources, different terminal devices corresponding to multiple sidelinks may be configured as multiple ready queues. The relevant information of the queues may be the priority sequence of each queue, or the length of each queue, or the time required for the execution of each queue, etc. For example, the higher the priority of a queue, the higher the priority of the terminal device in the queue. In another example, a queue with a high priority may be allocated to the first slot in the COT. Time-frequency resources start to be allocated to the next queue only when the queue with the high priority is idle.

[0120] In some embodiments, the first parameter may be determined based on a waiting time of the second terminal device for resource allocation from the first terminal device to prevent the terminal device from waiting too long without obtaining resources. For example, a service rate coefficient may be set in the first parameter such that the priority of the terminal device increases at a rate a as the waiting time increases.

[0121] In some embodiments, the first parameter may be determined based on related information of the NACK fed back by the second terminal device to the first terminal device. The related information of the NACK may be the number of NACKs fed back, or the slot in which the NACKs fed back are located, etc.

[0122] Taking the number of NACKs fed back by the second terminal device as an example, the first terminal device may set a threshold value related to the NACKs, such as a second threshold value. When the second threshold value represents the number of NACKs, the second threshold value may also be a positive integer, for example, 3 or 5. Specifically, if the number of NACKs fed back by the second terminal device is greater than the second threshold value, the first terminal device may adjust the first parameter of the second terminal device to lower its priority. Alternatively, if the number of NACKs fed back by the second terminal device is greater than the second threshold value, the first terminal device may no longer allocate resources to the second terminal device corresponding to the sidelink.

[0123] In some embodiments, the first parameter may alternatively be determined based on various types of related information of the second terminal device. As a possible implementation, the priority corresponding to the second terminal device may be determined based on multiple of the following information: signal quality of the sidelink corresponding to the second terminal device, the size of the resource required by the second terminal device, the priority of the queue in which the second terminal device is located, the waiting time of the second terminal device for resource allocation from the first terminal device, and the number of NACKs fed back by the second terminal device to the first terminal device. For example, if the RSRPs of the sidelinks corresponding to multiple second terminal devices are all RSRPs, the priority of the queue in which the second terminal device is located may be determined based on the number of NACKs fed back by the second terminal device. target If the first parameter of the second terminal device requiring the smallest COT resource is greater than 1, the first parameter of the second terminal device requiring the smallest COT resource may indicate that the second terminal device has the highest priority.

[0124] The resource shared by the first terminal device is the highest at a particular moment, for example, M×N SubCHsize When the number of PRBs reaches 1×T, the first terminal device stops allocating. Other terminal devices that will perform sidelink communication may continue monitoring or wait for the next allocation.

[0125] After receiving the first sidelink channel, the second terminal device may obtain the first COT sharing information in the first sidelink channel. In some embodiments, based on the first resource indicated by the first COT sharing information, the intra-cluster terminal device may perform sidelink communication with other members in the cluster. In some embodiments, based on the first resource indicated by the first COT sharing information, the out-cluster terminal device may choose an opportunity to join the COT shared by the first terminal device and use the remaining resources for sidelink communication. For example, the out-cluster terminal device may perform sidelink communication with other terminal devices. The other terminal devices here may be intra-cluster devices or other out-cluster devices.

[0126] As described above, after receiving the first resource, the second terminal device may feedback the use of the first resource to the first terminal device. In some embodiments, the second terminal device outside the communication cluster may transmit a PSFCH to the first terminal device to indicate the impact of the first resource on the communication result. For example, when the second terminal device feedbacks an ACK, it may indicate that the communication using the first resource is successful. In another example, when the second terminal device feedbacks a NACK, it may indicate that the communication using the first resource has failed and resource reallocation will be requested.

[0127] The second terminal device may further perform feedback to other terminal devices on the sidelink via the first resource indicating the result of the current communication.

[0128] As can be seen from the communication method of the two terminal devices in Figure 12, the first terminal device can allocate resources in the COT to the second terminal device according to a certain rule by transmitting a first sidelink channel containing resource allocation information. This rule ensures that resources are preferentially allocated to intra-cluster terminal devices, and the use of resources in the COT can be effectively improved by setting a reasonable priority rule for out-cluster terminal devices.

[0129] The above-mentioned unicast and groupcast communication modes in sidelink are described in detail below with reference to Figures 13 and 14 by taking unicast and groupcast communication in SL-U as an example. Figure 13 is an exemplary diagram of a system of unicast communication in SL-U. Figure 14 is an exemplary diagram of a system of groupcast communication in SL-U.

[0130] 13, the SL-U unicast communication system 1300 includes terminal devices 1301 to 1304. After accessing the network through LBT, the terminal device 1301 may initiate COT sharing. The terminal device 1301 transmits a PSCCH and a PSSCH carrying first COT sharing information to the terminal device 1302.

[0131] The terminal device 1302 is an intra-cluster terminal device that communicates with the terminal device 1301 on the sidelink. The terminal device 1302 obtains transmission and scheduling information SCI related to the sidelink by demodulating the PSCCH. The SCI can help the terminal device 1302 receive and decode the sidelink information. After receiving the PSSCH, the terminal device 1302 may obtain a first resource indicated by the first COT sharing information.

[0132] The terminal devices 1303 and 1304 are out-of-cluster terminal devices that will implement sidelink communication through COT sharing by the terminal device 1301. The terminal devices 1303 and 1304 may obtain first COT sharing information through detection to choose an opportunity to participate in COT sharing by the first terminal device. The first terminal device 1301 may allocate first resources to the terminal devices 1303 and 1304 according to the above priority principle.

[0133] 14, the SL-U groupcast communication system 1400 includes terminal devices 1401 to 1405. Terminal device 1401 communicates with its cluster member terminal devices 1402 to 1405 in a groupcast mode.

[0134] The terminal device 1401 is the initiating terminal of the COT sharing. The cluster member terminal devices 1402 to 1405 receive information from the terminal device 1401, demodulate the PSCCH / PSSCH, and obtain the start point, end point, duration, etc. of the COT sharing. The COT sharing information for the corresponding groupcast is exclusive to the cluster member. Other non-cluster terminals cannot communicate via the shared resources.

[0135] Cluster member terminal devices 1402 to 1405 usually have a short communication distance or the cluster is established for some important reasons. Therefore, when only cluster members implement sidelink communication via COT shared resources, the terminal device 1401 allocates resources in the simplest manner.

[0136] The non-cluster members receive the corresponding unicast COT-SI by the terminal device 1401. unicastThe terminal device 1401 obtains the COT shared information by detecting the COT shared information. The non-cluster members can conduct sidelink communication via resources in the corresponding unicast shared information. Thus, resource allocation by the terminal device 1401 involves the cluster members and possibly non-cluster members.

[0137] The method embodiments of the present application are described in detail above with reference to Figures 6 to 14. The device embodiments of the present application are described in detail below with reference to Figures 15 to 16. It should be understood that the description of the device embodiments corresponds to the description of the method embodiments, and therefore, for parts that are not described in detail, reference may be made to the above method embodiments.

[0138] 15 is a schematic structural diagram of a terminal device according to an embodiment of the present application. The terminal device is configured as a first terminal device and may implement the above-described transmitter-end communication method in FIG. 6. As shown in FIG. 15, the terminal device 1500 includes a communication module 1510.

[0139] The communication module 1510 may be configured to transmit a first sidelink channel to a second terminal device via a first sidelink, the first sidelink channel including first COT shared information, which satisfies one or more of the following: the first COT shared information is carried in a first PSSCH of the first sidelink channel; the first COT shared information includes second COT shared information and third COT shared information, the second COT shared information corresponds to a first communication mode, and the third COT shared information corresponds to a second communication mode.

[0140] Optionally, the first sidelink channel further includes a first PSCCH, the first PSCCH includes a first stage SCI, and the time domain resource in which the first COT shared information and the first stage SCI are located are adjacent.

[0141] Optionally, the last symbol in which the first stage SCI is located is the first symbol, and the time domain resource in which the first COT shared information is located includes one symbol or two consecutive symbols following the first symbol.

[0142] Optionally, the first sidelink channel further includes a first stage SCI and a second stage SCI, where the time domain resources in which the second COT shared information and the first stage SCI are located are adjacent, and the time domain resources in which the third COT shared information and the second stage SCI are located are adjacent, or the time domain resources in which the third COT shared information and the first stage SCI are located are adjacent, and the time domain resources in which the second COT shared information and the second stage SCI are located are adjacent.

[0143] Optionally, the second COT shared information and the third COT shared information each occupy one symbol.

[0144] Optionally, the first COT sharing information is used to indicate one or more of the following information: a COT start time, a COT end time, a COT duration, unused resources in the COT, and resources that are allowed to be used by a third terminal device participating in the COT sharing.

[0145] An embodiment of the present application further provides a terminal device, which is configured as a second terminal device and may implement the communication method at the receiver end described above in Figure 6. The second terminal device includes a communication module.

[0146] The communication module may be configured to receive, via a first sidelink, a first sidelink channel transmitted by a first terminal device, where the first sidelink channel includes first COT shared information, and the first COT shared information satisfies one or more of the following: the first COT shared information is carried in a first PSSCH of the first sidelink channel; and the first COT shared information includes second COT shared information and third COT shared information, where the second COT shared information corresponds to a first communication mode, and the third COT shared information corresponds to a second communication mode.

[0147] Optionally, the first sidelink channel further includes a first PSCCH, the first PSCCH includes a first stage SCI, and the time domain resource in which the first COT shared information and the first stage SCI are located are adjacent.

[0148] Optionally, the last symbol in which the first stage SCI is located is the first symbol, and the time domain resource in which the first COT shared information is located includes one symbol or two consecutive symbols following the first symbol.

[0149] Optionally, the first sidelink channel further includes a first stage SCI and a second stage SCI, where the time domain resources in which the second COT shared information and the first stage SCI are located are adjacent, and the time domain resources in which the third COT shared information and the second stage SCI are located are adjacent, or the time domain resources in which the third COT shared information and the first stage SCI are located are adjacent, and the time domain resources in which the second COT shared information and the second stage SCI are located are adjacent.

[0150] Optionally, the second COT shared information and the third COT shared information each occupy one symbol.

[0151] Optionally, the first COT sharing information is used to indicate one or more of the following information: a COT start time, a COT end time, a COT duration, unused resources in the COT, and resources that are allowed to be used by a third terminal device participating in the COT sharing.

[0152] An embodiment of the present application further provides a terminal device, which is configured as a first terminal device and may implement the above-described transmitter-end communication method in Figure 12. The first terminal device includes a communication module.

[0153] The communication module may be configured to transmit a first sidelink channel, the first sidelink channel including first COT sharing information, the first COT sharing information being used to indicate that the first terminal device has allocated a first resource in the COT to the second terminal device, the first resource being determined based on one or more of the following information: whether the second terminal device is a terminal device in a communication cluster in which the first terminal device is located, and a priority corresponding to the second terminal device.

[0154] Optionally, the priority corresponding to the second terminal device is determined based on a first parameter, the first parameter relating to one or more of the following information: a sidelink corresponding to the second terminal device, resources required by the second terminal device, a queue in which the second terminal device is located, a waiting time of the second terminal device for resource allocation from the first terminal device, and a NACK fed back by the second terminal device to the first terminal device.

[0155] Optionally, the first COT shared information includes second COT shared information and third COT shared information, the second COT shared information corresponding to the first communication mode and the third COT shared information corresponding to the second communication mode.

[0156] Optionally, if the second terminal device is a terminal device in a communication cluster, the first resource is allocated based on a cluster priority scheme.

[0157] Optionally, when the second terminal device is a terminal device in a communication cluster, the communication module is further configured to: when the number of NACKs fed back by the second terminal device is greater than a first threshold, the first terminal device allocates resources for retransmission from resources in the COT to the second terminal device.

[0158] Optionally, if the second terminal device is a terminal device outside the communication cluster, the first resource is determined based on a priority of the second terminal device.

[0159] Optionally, when the second terminal device is a terminal device outside the communication cluster, the communication module is further configured to cause the first terminal device to lower the priority of the second terminal device when the number of NACKs fed back by the second terminal device is greater than a second threshold.

[0160] An embodiment of the present application further provides a terminal device, which is configured as a second terminal device and may implement the communication method at the receiver end described above in Figure 12. The second terminal device includes a communication module.

[0161] The communication module may be configured to receive a first sidelink channel, the first sidelink channel including first COT sharing information, the first COT sharing information being used to indicate that the first terminal device has allocated a first resource in the COT to the second terminal device, the first resource being determined based on one or more of the following information: whether the second terminal device is a terminal device in a communication cluster in which the first terminal device is located, and a priority corresponding to the second terminal device.

[0162] Optionally, the priority corresponding to the second terminal device is determined based on a first parameter, the first parameter relating to one or more of the following information: a sidelink corresponding to the second terminal device, resources required by the second terminal device, a queue in which the second terminal device is located, a waiting time of the second terminal device for resource allocation from the first terminal device, and a NACK fed back by the second terminal device to the first terminal device.

[0163] Optionally, the first COT shared information includes second COT shared information and third COT shared information, the second COT shared information corresponding to the first communication mode and the third COT shared information corresponding to the second communication mode.

[0164] Optionally, if the second terminal device is a terminal device in a communication cluster, the first resource is allocated based on a cluster priority scheme.

[0165] Optionally, if the second terminal device is a terminal device outside the communication cluster, the first resource is determined based on a priority of the second terminal device.

[0166] Figure 16 is a schematic structural diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 16 indicate that the unit or module is optional. The device 1600 in Figure 16 may be configured to implement the method described in the above method embodiment. The device 1600 may be a chip, a terminal device, or a network device.

[0167] The device 1600 may include one or more processors 1610. The processor 1610 may enable the device 1600 to implement the methods described in the method embodiments above. The processor 1610 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or another programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor, etc.

[0168] The apparatus 1600 may further include one or more memories 1620. The memory 1620 stores a program that may be executed by the processor 1610 to cause the processor 1610 to perform the methods described in the above method embodiments. The memory 1620 may be separate from the processor 1610 or may be integrated into the processor 1610.

[0169] The apparatus 1600 may further include a transceiver 1630. The processor 1610 can communicate with another device or chip through the transceiver 1630. For example, the processor 1610 can transmit and receive data to and from another device or chip through the transceiver 1630.

[0170] An embodiment of the present application further provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or a network device provided in an embodiment of the present application, and the program causes a computer to perform the method to be performed by the terminal or the network device in various embodiments of the present application.

[0171] An embodiment of the present application further provides a computer program product, which includes a program, which can be applied to a terminal or a network device provided in an embodiment of the present application, and the program causes a computer to perform a method to be performed by the terminal or the network device in various embodiments of the present application.

[0172] The terms "system" and "network" in this application may be used interchangeably. In addition, the terms used in this application are only used to describe certain embodiments of this application and are not intended to limit this application. Please note that the terms "first", "second", "third", "fourth", etc. in the specification, claims, and drawings of this application are used to distinguish different objects, not to indicate a particular order. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover a non-exclusive inclusion.

[0173] In the embodiment of the present application, "indicate" mentioned herein may refer to a direct indication, or may refer to an indirect indication, or may mean that there is an association relationship. For example, A indicates B may mean that A directly indicates B, e.g., B can be obtained by A, or A indirectly indicates B, e.g., A indicates C and B can be obtained by C, or may mean that there is an association relationship between A and B.

[0174] In embodiments of the present application, the term "corresponding" may mean that there is a direct or indirect correspondence between two, or that there is an association relationship between two, which may also be a relationship such as indicating and being indicated, or configuring and being configured.

[0175] In the embodiments of the present application, "predefined" or "pre-configured" may be implemented by pre-storing a corresponding code, table, or other form that can be used to indicate relevant information in a device (including, for example, a terminal device and a network device), and the specific implementation form is not limited in the present application. For example, predefined may refer to defined in the protocol.

[0176] In an embodiment of the present application, determining B based on A does not mean determining B based only on A; instead, B may be determined based on A and / or other information.

[0177] In the embodiment of the present application, the term "and / or" is only used to represent an association relationship between related entities, and indicates that there may be three relationships. For example, A and / or B may indicate that only A exists, that both A and B exist, or that only B exists. In addition, the character " / " in this specification generally indicates an "or" relationship between related entities.

[0178] In the embodiment of the present application, the sequence numbers of the above processes do not mean the execution sequence. The execution sequence of the processes should be determined according to the functions and internal logic of the processes, and should not be construed as any restriction on the implementation process of the embodiment of the present application.

[0179] In some embodiments provided in the present application, it should be understood that the disclosed system, device, and method may be implemented in other manners. For example, the described device embodiment is only an example. For example, the unit division is only a logical function division, and may be other divisions in actual implementation. For example, multiple units or components may be combined or incorporated into another system, or some functions may be ignored or not implemented. In addition, the shown or discussed mutual couplings or direct couplings or communication connections may be implemented by using some interfaces. Indirect couplings or communication connections between devices or units may be implemented in electrical, mechanical, or other forms.

[0180] The units described as separate parts may or may not be physically separated, and the parts shown as units may or may not be physical units, may be located in one location or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

[0181] In addition, the functional units in the embodiments of the present application may be integrated into one processing unit, or each of the units may exist physically alone, or two or more units may be integrated into one unit.

[0182] All or part of the above embodiments may be implemented by using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, the above embodiments may be fully or partially implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the procedures and functions according to the embodiments of the present application are fully or partially generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or another programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center in a wired manner (such as coaxial cable, optical fiber, and digital subscriber line (DSL)) or a wireless manner (such as infrared, wireless, and microwave). The computer-readable storage medium may be any available medium that can be read by a computer or a data storage device such as a server or data center that integrates one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, or a magnetic tape), an optical medium (e.g., a digital versatile disk (DVD)), a semiconductor medium (e.g., a solid-state drive (SSD)), or the like.

[0183] The above description is merely a specific implementation form of the present application, and the protection scope of the present application is not limited thereto. Any variations or replacements that can be easily thought of by a person skilled in the art within the technical scope disclosed in this application shall fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims. [Explanation of symbols]

[0184] 100 Wireless communication system 110 Network Devices 121,122,123,124,125,126,127,128,129 Terminal Devices 200 V2X Communication System 201,202,203,204,205 Terminal devices 1300 SL-U Unicast Communication System 1301,1302,1303,1304 Terminal Devices 1400 SL-U Groupcast Communication System 1401,1402,1403,1404,1405 Terminal Devices 1500 Terminal Devices 1510 Communication Module 1600 equipment 1610 Processor 1620 Memory 1630 Transceiver

Claims

1. 1. A communication method comprising: transmitting, by a first terminal device, a first sidelink channel via a first sidelink to a second terminal device; 2. The method for communicating with a mobile station according to claim 1, wherein the first sidelink channel includes first channel occupation time (COT) shared information, the first sidelink channel further includes a first physical sidelink control channel (PSCCH), the first PSCCH includes first stage sidelink control information (SCI), the time domain resources in which the first COT shared information and the first stage SCI are located are adjacent, and the first COT shared information is carried in a first physical sidelink shared channel (PSSCH) of the first sidelink channel.

2. The communication method of claim 1, wherein the first COT shared information includes information corresponding to a communication mode.

3. 2. The communication method of claim 1, wherein the last symbol in which the first stage SCI is located is a first symbol, and the time domain resource in which the first COT shared information is located includes one symbol or two consecutive symbols following the first symbol.

4. The first COT shared information includes the following information: COT start time, COT end time, COT duration, Unused resources in the COT, or Resources that are permitted to be used by third-party terminal devices participating in a COT share The communication method according to claim 1 , further comprising at least one of:

5. 1. A communication method comprising: receiving, by a second terminal device, a first sidelink channel transmitted by the first terminal device via a first sidelink; 2. The method for communicating with a mobile station according to claim 1, wherein the first sidelink channel includes first channel occupation time (COT) shared information, the first sidelink channel further includes a first physical sidelink control channel (PSCCH), the first PSCCH includes first stage sidelink control information (SCI), the time domain resources in which the first COT shared information and the first stage SCI are located are adjacent, and the first COT shared information is carried in a first physical sidelink shared channel (PSSCH) of the first sidelink channel.

6. The communication method of claim 5, wherein the first COT shared information includes information corresponding to a communication mode.

7. 6. The communication method of claim 5, wherein the last symbol in which the first stage SCI is located is a first symbol, and the time domain resource in which the first COT shared information is located includes one symbol or two consecutive symbols following the first symbol.

8. The first COT shared information includes the following information: COT start time, COT end time, COT duration, Unused resources in the COT, or Resources that are permitted to be used by third-party terminal devices participating in a COT share The communication method according to claim 5, further comprising at least one of:

9. A first terminal device, comprising: At least one processor; one or more memories coupled to the at least one processor and storing programming instructions; Equipped with The programming instructions, when executed by the at least one processor, cause the first terminal device to transmit a first sidelink channel over a first sidelink to a second terminal device; a first terminal device, the first sidelink channel including first channel occupation time (COT) shared information, the first sidelink channel further including a first physical sidelink control channel (PSCCH), the first PSCCH including first stage sidelink control information (SCI), the first COT shared information and the first stage SCI being located in time domain resources adjacent to each other, and the first COT shared information being carried in a first physical sidelink shared channel (PSSCH) of the first sidelink channel.

10. The first terminal device described in claim 9, wherein the first COT shared information includes information corresponding to a communication mode.

11. The first terminal device of claim 9, wherein the last symbol in which the first stage SCI is located is a first symbol, and the time domain resource in which the first COT shared information is located includes one symbol or two consecutive symbols following the first symbol.

12. The first COT shared information includes the following information: COT start time, COT end time, COT duration, Unused resources in the COT, or Resources that are permitted to be used by third-party terminal devices participating in a COT share The first terminal device according to claim 9, exhibiting at least one of the following:

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