Communication method and communication apparatus for sidelink

Abstract

Provided in the present application are a communication method and communication apparatus for a sidelink. The communication method comprises: receiving N pieces of first data, wherein the N pieces of first data are pieces of data carried on a physical sidelink shared channel (PSSCH) of T carriers; and sending on a first carrier among the T carriers at least one physical sidelink feedback channel (PSFCH), wherein the at least one PSFCH carries feedback information, the feedback information being feedback information of the N pieces of first data. In the method of the present application, a PSSCH of at least two carriers is fed back by means of a PFSCH on one carrier, and thus one carrier is used to simultaneously feed data of a plurality of carriers back when an apparatus fails to feed back all received carriers due to the fact that the apparatus is limited in terms of capability, thereby ensuring the reliability of data transmission.

Description

A sidelink communication method and communication device

[0001] This application claims priority to a Chinese patent application filed with the State Intellectual Property Office of China on September 8, 2023, with application number 202311161993.6, and entitled “A sidelink communication method and communication device”. Technical Field

[0002] The present application relates to the field of energy technology, and more particularly, to a power conversion device. Background Art

[0003] Cellular vehicle-to-everything (C-V2X) is a V2X communication technology developed based on cellular systems. It utilizes and enhances current cellular network functions and elements to achieve low-latency and high-reliability communication between various nodes in the vehicle network. In LTE-V2X, the selection of carriers is determined by the data link layer. Data or transmission blocks can only be sent on a single carrier, and their initial transmission and retransmission can only be on the same carrier. For the listening-based resource selection process, each carrier is independent and does not affect each other. LTE-V2X does not support the physical sidelink feedback channel feedback mechanism. If the transmit and receive carrier capabilities between terminal devices do not match, the number of carriers received by the terminal device will be greater than the number of carriers that the terminal device can send, and the terminal device will not be able to feedback data on all received carriers.

[0004] Summary of the Invention

[0005] The present application provides a communication method and a communication device, which feed back data of multiple carriers through a physical sidelink feedback channel on one carrier, thereby ensuring the reliability of data transmission.

[0006] In a first aspect, a sidelink communication method is provided, comprising: receiving N first data, where the N first data are data carried on a physical sidelink shared channel PSSCH of T carriers; sending at least one physical sidelink feedback channel PSFCH on a first carrier among the T carriers, where each of the at least one PSFCH carries feedback information, where the feedback information is feedback information of at least two of the N first data, wherein N is a positive integer greater than or equal to 2, and 2≤T≤N.

[0007] By feeding back N data carried on the PSSCH of at least two carriers via the PFSCH on one carrier, when the device is limited in capacity and cannot provide one-to-one feedback for all received carriers, one carrier can be used to simultaneously feed back N data carried on the PSSCH of at least two carriers to ensure the reliability of data transmission.

[0008] In conjunction with the first aspect, in certain implementations of the first aspect, the time domain position of at least one PSFCH is determined based on resource pool configuration information for T carriers, where the resource pool configuration information includes first information indicating a minimum gap between the PSFCH configured in the resource pool and the corresponding PSSCH. This ensures that the PSFCH sent by the device complies with time constraints and correctly feeds back the first data on the T carriers.

[0009] In conjunction with the first aspect, in certain implementations of the first aspect, the resource pool configuration information further includes second information indicating a PSFCH feedback period configured for the resource pool, thereby ensuring that the PSFCH sent by the device complies with time constraints and correctly feeds back the first data on the T carriers.

[0010] In combination with the first aspect, in certain implementations of the first aspect, wherein: at least one PSFCH is a PSFCH, and the end position of the time slot where a PSFCH is located is aligned with the end position of the first time slot in the time domain position; wherein the first time slot is located in the Kth time slot after the time slot where the first PSSCH is located, K≥P, the first PSSCH is a PSSCH carrying any one of the N first data, the first time slot and the first PSSCH are located in the same resource pool of the same carrier, and P is the minimum gap between the PSFCH and the corresponding PSSCH configured in the resource pool where the first PSSCH is located.

[0011] That is, the distance between the time domain position of the PSFCH sent by the device and the time slot of any PSSCH carrying the first data is greater than the minimum gap between the PSFCH configured in its resource pool and the corresponding PSSCH, thereby ensuring that the PSFCH sent by the device meets the time constraint conditions and correctly feeds back the first data on T carriers.

[0012] In combination with the first aspect, in certain implementations of the first aspect, wherein: in time domain position, the time slot where each PSFCH in at least one PSFCH is located is located after the first time slot or the end position of the time slot where each PSFCH in at least one PSFCH is located is aligned with the end position of the first time slot, and the time slot where each PSFCH in at least one PSFCH is located is located before the second time slot; wherein, the first time slot is located at the Kth time slot after the time slot where the first PSSCH is located, K≥P, the first PSSCH is a PSSCH carrying any one of the N first data, the second time slot is located at the Lth time slot after the first time slot, the first time slot, the second time slot and the first PSSCH are located in the same resource pool of the same carrier, P is the minimum gap between the PSFCH and the corresponding PSSCH configured in the resource pool of the carrier where the first PSSCH is located, and L is the PSFCH feedback period configured in the resource pool where the first PSSCH is located.

[0013] That is, the distance between the time domain position of one or more PSFCHs sent by the device and the time slot of any PSSCH carrying the first data is greater than the minimum gap between the PSFCH configured in its resource pool and the corresponding PSSCH, and is located before the next PSFCH feedback cycle, thereby ensuring that the PSFCH sent by the device meets the time constraint conditions and ensures that there is no repetition between cycles, thereby correctly feeding back the first data on T carriers.

[0014] In combination with the first aspect, in certain implementations of the first aspect, at least one PSFCH includes corresponding feedback information of the first data carried on the second PSSCH, wherein the second PSSCH and the first time slot are located in the same resource pool, and the second PSSCH is located in the Mth time slot before the first time slot, P≤M≤P+a×L, a is a positive integer, and L is the PSFCH feedback period configured for the resource pool where the second PSSCH is located.

[0015] Thus, at least one PSFCH can be used to reflect the first data on the PSSCH within the corresponding PSFCH feedback cycle on T carriers and the first data on the PSSCH before the feedback cycle, so as to ensure no repetition between cycles and correctly feedback the first data on the T carriers when the time domain resources on the first carrier are tight.

[0016] In some implementations, a is equal to 1.

[0017] In conjunction with the first aspect, in certain implementations of the first aspect, each PSFCH in at least one PSFCH includes at least N frequency domain resource sets, the N frequency domain resource sets correspond one-to-one to N first data, and each of the N frequency domain resource sets is used to carry feedback information for the corresponding first data. In this implementation, each PSFCH sent by the device on the first carrier needs to include frequency domain resource sets corresponding to the N first data on T carriers, thereby utilizing one carrier to feedback data on T carriers, thereby achieving reliable data transmission.

[0018] In conjunction with the first aspect, in certain implementations of the first aspect, at least one PSFCH includes at least N frequency domain resource sets, the N frequency domain resource sets correspond one-to-one to the N first data, and each of the N frequency domain resource sets is used to carry feedback information of the corresponding first data. In this implementation, the one or more PSFCHs sent by the device on the first carrier need to include frequency domain resource sets corresponding to the N first data. That is, when sending multiple PSFCHs, each PSFCH can carry feedback information for a portion of T carriers, thereby using one carrier to feedback data on T carriers, thereby achieving reliable data transmission.

[0019] In combination with the first aspect, in certain implementations of the first aspect, the N frequency domain resource sets do not overlap.

[0020] In combination with the first aspect, in certain implementations of the first aspect, the method further includes: determining a first carrier among the T carriers, the PSFCH time domain density of the first carrier being greater than or equal to any other carrier among the T carriers; wherein the PSFCH time domain density is determined according to the PSFCH feedback period configured by the resource pool of the carrier and / or the subcarrier spacing corresponding to the bandwidth portion of the carrier. Thus, PSFCH is sent on a carrier with higher time domain density to feedback the carrier with lower time domain density, thereby avoiding PSFCH resource congestion. The larger the subcarrier spacing corresponding to the bandwidth portion of the carrier, the higher the PSFCH density; the larger the PSFCH feedback period configured by the resource pool of the carrier, the larger the PSFCH.

[0021] According to a second aspect, a sidelink communication method is provided, comprising: sending N first data, the N first data being data carried on a physical sidelink shared channel PSSCH of T carriers; receiving at least one physical sidelink feedback channel PSFCH on a first carrier among the T carriers, the at least one PSFCH carrying feedback information, the feedback information being feedback information of the N first data, wherein N is a positive integer greater than or equal to 2, and 2≤T≤N.

[0022] In conjunction with the second aspect, in certain implementations of the second aspect, the feedback information includes feedback information of the first data corresponding to the first carrier. That is, the device first ensures feedback of the data of the first carrier where the PSFCH is located, thereby ensuring reliable transmission of the data on the first carrier.

[0023] In conjunction with the second aspect, in certain implementations of the second aspect, the time domain position of at least one PSFCH is determined based on resource pool configuration information for T carriers, where the resource pool configuration information includes first information indicating a minimum gap between the PSFCH configured in the resource pool and the corresponding PSSCH. This ensures that the PSFCH sent by the device complies with time constraints and correctly feeds back the first data on the T carriers.

[0024] In conjunction with the second aspect, in certain implementations of the second aspect, the resource pool configuration information further includes second information indicating a PSFCH feedback period configured for the resource pool, thereby ensuring that the PSFCH sent by the device complies with time constraints and correctly feeds back the first data on the T carriers.

[0025] In combination with the second aspect, in certain implementations of the second aspect, wherein: at least one PSFCH is a PSFCH, and the end position of the time slot where a PSFCH is located is aligned with the end position of the first time slot in the time domain position; wherein, the first time slot is located in the Kth time slot after the time slot where the first PSSCH is located, K≥P, the first PSSCH is a PSSCH carrying any one of the N first data, the first time slot and the first PSSCH are located in the same resource pool of the same carrier, and P is the minimum gap between the PSFCH and the corresponding PSSCH configured in the resource pool where the first PSSCH is located.

[0026] That is, the distance between the time domain position of the PSFCH sent by the device and the time slot of any PSSCH carrying the first data is greater than the minimum gap between the PSFCH configured in its resource pool and the corresponding PSSCH, thereby ensuring that the PSFCH sent by the device meets the time constraint conditions and correctly feeds back the first data on T carriers.

[0027] In combination with the second aspect, in certain implementations of the second aspect, wherein: in time domain position, the time slot where each PSFCH in at least one PSFCH is located is located after the first time slot or the end position of the time slot where each PSFCH in at least one PSFCH is located is aligned with the end position of the first time slot, and the time slot where each PSFCH in at least one PSFCH is located is located before the second time slot; wherein, the first time slot is located at the Kth time slot after the time slot where the first PSSCH is located, K≥P, the first PSSCH is a PSSCH carrying any one of the N first data, the second time slot is located at the Lth time slot after the first time slot, the first time slot, the second time slot and the first PSSCH are located in the same resource pool of the same carrier, P is the minimum gap between the PSFCH and the corresponding PSSCH configured in the resource pool of the carrier where the first PSSCH is located, and L is the PSFCH feedback period configured in the resource pool where the first PSSCH is located.

[0028] That is, the distance between the time domain position of one or more PSFCHs sent by the device and the time slot of any PSSCH carrying the first data is greater than the minimum gap between the PSFCH configured in its resource pool and the corresponding PSSCH, and is located before the next PSFCH feedback cycle, thereby ensuring that the PSFCH sent by the device meets the time constraint conditions and ensures that there is no repetition between cycles, thereby correctly feeding back the first data on T carriers.

[0029] In combination with the second aspect, in certain implementations of the second aspect, at least one PSFCH includes corresponding feedback information of the first data carried on the second PSSCH, wherein the second PSSCH and the first time slot are located in the same resource pool, and the second PSSCH is located in the Mth time slot before the first time slot, P≤M≤P+a×L, a is a positive integer, and L is the PSFCH feedback period configured for the resource pool where the second PSSCH is located.

[0030] Thus, at least one PSFCH can be used to reflect the first data on the PSSCH within the corresponding PSFCH feedback cycle on T carriers and the first data on the PSSCH before the feedback cycle, ensuring no repetition between cycles and correctly feeding back the first data on the T carriers.

[0031] In some implementations, a is equal to 1.

[0032] In conjunction with the second aspect, in certain implementations of the second aspect, each PSFCH in at least one PSFCH includes at least N frequency domain resource sets, the N frequency domain resource sets correspond one-to-one to the N first data, and each of the N frequency domain resource sets is used to carry feedback information for the corresponding first data. In this implementation, each PSFCH sent by the device on the first carrier needs to include frequency domain resource sets corresponding to the N first data on T carriers, thereby using one carrier to feedback data on T carriers, thereby achieving reliable data transmission.

[0033] In conjunction with the second aspect, in certain implementations of the second aspect, at least one PSFCH includes at least N frequency domain resource sets, the N frequency domain resource sets correspond one-to-one to the N first data, and each of the N frequency domain resource sets is used to carry feedback information of the corresponding first data. In this implementation, the one or more PSFCHs sent by the device on the first carrier need to include frequency domain resource sets corresponding to the N first data. That is, when sending multiple PSFCHs, each PSFCH can carry feedback information for a portion of T carriers, thereby using one carrier to feedback data on T carriers, thereby achieving reliable data transmission.

[0034] In combination with the second aspect, in certain implementations of the second aspect, the N frequency domain resource sets do not overlap.

[0035] In combination with the second aspect, in certain implementations of the second aspect, the method further includes: determining a first carrier among the T carriers, the PSFCH time domain density of the first carrier being greater than or equal to any other carrier among the T carriers; wherein the PSFCH time domain density is determined according to the PSFCH feedback period configured by the resource pool of the carrier and / or the subcarrier spacing corresponding to the bandwidth part of the carrier. Thus, the PSFCH is sent on the carrier with higher time domain density to feedback the carrier with lower time domain density, thereby avoiding PSFCH resource congestion. The larger the subcarrier spacing corresponding to the bandwidth part of the carrier, the higher the PSFCH density; the larger the PSFCH feedback period configured by the resource pool of the carrier, the larger the PSFCH.

[0036] In a third aspect, a communication device is provided, comprising: a transceiver module and a processing module, wherein some or all steps of the method described in the first aspect and any possible implementation thereof are executed.

[0037] In a fourth aspect, a communication device is provided, comprising: a transceiver module and a processing module, wherein some or all of the steps of the method described in the second aspect and any possible implementation thereof are executed.

[0038] In a fifth aspect, a chip is provided, which includes a processor, the processor is coupled to a memory, the memory is used to store computer programs, and the processor is used to execute the computer programs stored in the memory, so that some or all steps of the method in the above-mentioned first aspect and any possible implementation thereof are executed.

[0039] In a sixth aspect, a computer-readable storage medium is provided, in which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, part or all of the steps of the method described in the first aspect and any possible implementation thereof, and the second aspect and any possible implementation thereof are executed.

[0040] In the seventh aspect, a computer product is provided. When the computer program product is run, part or all of the steps of the method described in the first aspect and any possible implementation thereof, the second aspect and any possible implementation thereof, the third aspect and any possible implementation thereof, and the fourth aspect and any possible implementation thereof are executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG1 is a schematic diagram of a communication system applicable to an embodiment of the present application.

[0042] FIG2 is a schematic diagram of an application scenario applicable to an embodiment of the present application.

[0043] FIG3 is a schematic diagram of a carrier aggregation scenario applicable to an embodiment of the present application.

[0044] FIG4 is a schematic diagram of the time-frequency domain resource location of a PSCCH provided in an embodiment of the present application.

[0045] FIG5 is a schematic diagram of the time-frequency domain resource location of a PSFCH provided in an embodiment of the present application.

[0046] FIG6 is a schematic diagram of the frequency domain resource location of a PSFCH provided in an embodiment of the present application.

[0047] FIG7 is a schematic diagram of an interleaved resource block provided in an embodiment of the present application.

[0048] FIG8 is a schematic diagram showing the relationship between one-to-one mapping and one-to-many mapping provided in an embodiment of the present application.

[0049] FIG9 is a schematic diagram of a mismatch in transceiver capabilities between terminal devices provided in an embodiment of the present application.

[0050] FIG10 is a schematic diagram of a communication method provided in an embodiment of the present application.

[0051] FIG11 is a schematic diagram of a carrier structure provided in an embodiment of the present application.

[0052] FIG12 is a schematic diagram of a mapping relationship between multiple carriers provided in an embodiment of the present application.

[0053] FIG13 is a schematic diagram of a mapping relationship between CC1 and CC2 provided in an embodiment of the present application.

[0054] FIG14 is a schematic diagram of another mapping relationship between CC1 and CC2 provided in an embodiment of the present application.

[0055] FIG15 is a schematic diagram of another mapping relationship between CC1 and CC2 provided in an embodiment of the present application.

[0056] FIG16 is a schematic diagram of another mapping relationship between CC1 and CC2 provided in an embodiment of the present application.

[0057] FIG17 is a schematic diagram of another mapping relationship between CC1 and CC2 provided in an embodiment of the present application.

[0058] FIG18 is a schematic diagram of another mapping relationship between CC1 and CC2 provided in an embodiment of the present application.

[0059] FIG19 is a schematic diagram of a communication device provided in an embodiment of the present application.

[0060] Figure 20 is a schematic diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0062] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global system for mobile communications (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), LTE system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) system or new radio (NR) and other evolved communication systems, vehicle-to-XV2X, where V2X can include vehicle to network (V2N), vehicle to vehicle (V2V), vehicle to infrastructure (V2I), vehicle to pedestrian (V2I), and vehicle to pedestrian (V2P), long term evolution-vehicle (LTE-V), Internet of Vehicles, machine type communication (MTC), Internet of Things (IoT), long term evolution-machine (LTE-M), machine to machine (M2M), device to device (D2D), etc.

[0063] The terminal device in the embodiment of the application may refer to user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal device may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a 5G network or a terminal device in an evolved public land mobile network (PLMN), etc., and the embodiment of the application is not limited to this. For example, the terminal device can be an on-board device, a complete vehicle device, an on-board module, a vehicle, an on-board unit (OBU), a roadside unit (RSU), a telematics box (T-box), a chip or a system on chip (SOC), etc. The above chip or SOC can be installed in a vehicle, OBU, RSU or T-box.

[0064] The terminal devices involved in the embodiments of the present application also include at least one of user equipment, augmented reality (AR) / virtual reality (VR) / extended reality (XR) devices, wearable devices, smart home appliance terminals, terminal devices and communication modules of terminal devices, mobile phones and communication modules in mobile phones, vehicles and communication modules in vehicles, information processing equipment, display devices, network devices, base stations, TRPs, customer premise equipment (CPE), routers, network access devices, etc. Considering Uu (UTRAN-to-terminal equipment) air interface transmission, the two parties of wireless communication include the network device and the user communication device; considering SL air interface transmission, the transmitting and receiving ends of the wireless communication are both user communication devices. In the system architecture diagram, the network device can be a traditional macro base station eNB in ​​a traditional UMTS / LTE wireless communication system, a micro base station eNB in ​​a heterogeneous network (HetNet) scenario, a baseband unit (BBU) and a remote radio unit (RRU) in a distributed base station scenario, a baseband pool BBU pool and radio frequency unit RRU in a CRAN scenario, and a gNB in ​​a wireless communication system. The user communication device can be an in-vehicle communication module or other embedded communication module, or a user handheld communication device, including a mobile phone, tablet computer, etc. The network elements involved in this application are mainly V-terminal devices (vehicle user equipment).

[0065] The network device in the embodiment of the present application can be a device for communicating with a terminal device. The network device can be a base station (base transceiver station, BTS) in a global system of mobile communication (GSM) system or code division multiple access (CDMA), or a base station (NodeB, NB) in a wideband code division multiple access (WCDMA) system, or an evolved base station (eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (CRAN) scenario, or the network device can be a relay station, an access point, an in-vehicle device, a wearable device, a network device in a 5G network, or a network device in an evolved PLMN network, etc., and the embodiment of the present application is not limited.

[0066] Figure 1 is a schematic diagram of a communication system applicable to an embodiment of the present application. Cellular vehicle-to-everything (C-V2X) is a V2X communication technology developed based on a cellular system. It utilizes and enhances current cellular network functions and elements to achieve low-latency and high-reliability communications between various nodes in a vehicle network. As shown in Figure 1(a), Figure 1(b) and Figure 1(c), C-V2X includes V2V, V2P, V2I and V2N. As the cellular system evolves from 4G long-term evolution to 5G, C-V2X evolves from LTE-V2X to NR-V2X (new radio V2X, NR-V2X).

[0067] V2X communication has enormous potential to reduce vehicle collisions and casualties. Furthermore, the benefits of V2X extend beyond safety. V2X communication also facilitates better traffic management, further promoting green transportation and lowering energy consumption. Intelligent transportation systems (ITS) are applications that incorporate V2X. Based on V2X technology, vehicle users (V-UEs) can transmit information such as their location, speed, and intentions (turns, lane changes, and reversing) to surrounding V-UEs periodically, as well as non-periodic event-triggered information. Similarly, V-UEs receive real-time information from surrounding users. 5G NR V2X supports lower transmission latency, more reliable communication, higher throughput, and a better user experience, meeting the needs of a wider range of application scenarios. Furthermore, the vehicle-to-vehicle communication technology supported by V2X can be extended to device-to-device (D2D) communication in any system.

[0068] To facilitate understanding of the embodiments of the present application, first, a brief introduction to the concepts and technologies involved in the embodiments of the application is given.

[0069] It should be understood that the relevant terms and explanations in the following text are common to all embodiments throughout the text. Different embodiments can be used independently or in combination based on certain internal or external connections. Different implementation methods in the embodiments can be used independently or in combination.

[0070] Figure 2 is a schematic diagram of an application scenario applicable to an embodiment of the present application. This application is applied in systems where user terminals communicate directly with each other, such as V2X and D2D, and is applicable to communication scenarios with and without network coverage, and a mode where users independently select resources. As shown in Figure 2 (a), the embodiment of the present application can be implemented within the coverage range of the network device, or it can also be implemented between user terminals outside the coverage range of the network device, as shown in Figures 2 (b) and (c).

[0071] 1. Carrier aggregation (CA)

[0072] Carrier aggregation (CA) is the aggregation of two or more component carriers (CCs) to support a larger transmission bandwidth. To efficiently utilize fragmented spectrum, carrier aggregation supports aggregation between different CCs.

[0073] Figure 3 is a schematic diagram of a carrier aggregation scenario applicable to an embodiment of the present application. As shown in Figure 3, carrier aggregation can include: intra-band aggregation (intra-band CA) shown in Figures 3 (a) and (b), and inter-band aggregation (inter-band CA) shown in Figure 3 (c). Intra-band aggregation means that the aggregated CCs belong to different frequency bands. For intra-band aggregation, the aggregated CCs belong to the same frequency band. It can be further divided into carrier aggregation of contiguous CCs within the band and carrier aggregation of non-contiguous CCs within the band, etc.

[0074] In LTE-V2X, CC selection is determined by the data link layer. Data or transport blocks can only be transmitted on a single CC, and initial and retransmissions can only be performed on the same CC. Each CC performs independent resource selection based on listening, and CCs do not affect each other. Furthermore, the UE's transmission capability may be limited, meaning that the UE cannot support transmission on a CC due to the following reasons:

[0075] (1) The number of transmitting radio frequency links is less than the configured transmitting CC;

[0076] (2) The UE does not support the given frequency band combination;

[0077] (3) Sending RF link switching time requirements;

[0078] (3) The UE cannot meet the RF requirements, such as power spectral density (PSD).

[0079] 2. Resources:

[0080] Specifically, it can refer to time domain resources or frequency domain resources or time-frequency resources. According to the standard Rel-16 / Rel-17 NR protocol, the scheduling granularity of the physical sidelink control channel PSCCH (physical sidelink control channel, PSCCH) or the physical sidelink shared channel (physical sidelink shared channel, PSSCH) is one time slot in the time domain and one or more consecutive sub-channels in the frequency domain. The transmitting terminal device can send sidelink information on this resource, and one resource can carry three channels: PSCCH, PSSCH, physical sidelink feedback channel (physical sidelink feedback channel, PSFCH) and demodulation reference signal (demodulation reference signal, DM-RS), channel state information reference signal (channel state information reference signal, CSI-RS) and other signals.

[0081] 3. Time unit, frequency domain unit:

[0082] Time domain resources include symbols, slots, mini-slots, partial slots, sub-frames, radio frames, and sensing slots.

[0083] Frequency domain resources include resource elements (RE), resource blocks (RB), RB sets, subchannels, resource pools, bandwidth parts (BWP), carriers, channels, and interlaces.

[0084] 4. Resource pool

[0085] A resource pool is a collection of time-frequency resources. For example, a resource pool is a collection of time-frequency resources used by a terminal device in a sidelink (SL) to transmit or receive the Physical Sidelink Shared Channel (PSSCH) and / or the Physical Sidelink Control Channel (PSCCH). Different resource pools are distinguished by radio resource control (RRC) signaling. Terminal devices receive on a receiving resource pool and transmit on a transmitting resource pool.

[0086] Under network coverage, the terminal device can obtain SL resource pool configuration information and / or SL bandwidth part (BWP) configuration information by receiving the system information block (SIB) of the network equipment, cell-level (cell-specific) radio resource control (RRC) signaling or terminal device user-level (UE-specific) RRC signaling. The terminal device can also use pre-configured SL resource pool configuration information or SL BWP configuration information, for example, when there is no network coverage. The SL resource pool configuration information includes resource pool resource information, and the resource pool resource information is used to indicate the SL resource pool. The resource pool is a collection of time-frequency resources used for side communication between UEs.

[0087] The SL BWP configuration information may include SL resource pool information, which is used to configure the number of resource pools included in the BWP. The SL BWP configuration information may include SL bandwidth information, which is used to indicate the bandwidth size for SL communication, for example, indicating that the SL bandwidth is 20 megahertz (MHz). In this application, unless the meaning of the time unit is otherwise specified, it is described in terms of time slots, but the time unit is not limited to time slots. Unless the meaning of the time-frequency domain unit is otherwise specified, it is described in terms of subchannels, but the frequency domain unit is not limited to subchannels.

[0088] 5. Physical sidelink control channel (PSCCH) / physical sidelink shared channel (PSSCH)

[0089] PSCCH carries first-order sidelink control information (SCI), PSSCH carries second-order SCI and / or data, and PSFCH carries feedback information. PSCCH / PSSCH includes PSCCH and / or PSSCH. Since SL is a distributed system, all UEs need to correctly decode the first-level SCI before decoding the second-level SCI and PSSCH. However, in order to reduce the complexity of UE's blind decoding of PSCCH, the resource location of PSCCH is relatively fixed, and the first-level SCI format information carried is also relatively unique, that is, the UE does not need to blindly detect the time-frequency resource location where the PSCCH is located, nor does it need to blindly detect SCI of different formats. The UE only needs to detect whether the first-level SCI exists at the fixed PSCCH time-frequency resource location.

[0090] Figure 4 is a schematic diagram of the time-frequency domain resource location of a PSCCH provided in an embodiment of the present application. PSCCH may exist in each subchannel on each time slot, that is, the time domain starting position of a PSCCH is the second symbol used for SL transmission on each time slot, with a length of 2 or 3 symbols (determined by the resource pool configuration information), and the frequency domain position is the smallest PRB index of each subchannel, with a length of at least 10 PRBs (determined by the resource pool configuration information) but not exceeding the size of the subchannel. Among them, the resources occupied by PSCCH do not include automatic gain control symbols (automatic generation control, AGC).

[0091] The Frequency resource assignment field and the Time resource assignment field in the first-stage SCI are used to indicate the frequency domain resources and time domain resources for transmitting PSSCH, respectively. The Resource reservation period field is used to indicate the periodic reservation of resources for transmitting PSSCH. The value of the Resource reservation period field is configured by the network device, or is preconfigured, or predefined. In some implementations, this field can be indicated by the first RRC signaling, and the first RRC signaling can be determined using sl-ResourceReservePeriod1. The format of the second-stage SCI is indicated by the 2nd-stage SCI format field in the first-stage SCI.

[0092] 6. Physical sidelink feedback channel (PSFCH)

[0093] In the Rel-16 V2X SL, the transmission resources of the transmitting UE in user-selected resource mode (mode 2) are independent of the base station. The transmitting UE selects transmission resources within the resource selection window based on the results of its own perception window for communication.

[0094] In sidelink communications, PSFCH can be used to transmit feedback information. NR-V2X supports physical layer HARQ-ACK feedback. For example, for a PSSCH transmission, if the transmitter carries hybrid automatic repeat request acknowledgment (HARQ-ACK) feedback enable information in the control information, the receiver can feedback the corresponding positive (ACK) or negative (NACK) information based on the decoding result of the PSSCH. The ACK or NACK information is transmitted via the PSFCH.

[0095] Figure 5 is a schematic diagram of the time-frequency domain resource location of a PSFCH provided by an embodiment of the present application. The PSFCH channel resource is a periodic resource configured in the resource pool, wherein the period configuration parameter indicates the PSFCH feedback period configured in the resource pool. It can be 0, 1, 2, or 4. Indicates that there is no PSFCH resource configuration in the resource pool and PSFCH transmission is not enabled in the resource, that is, physical layer HARQ feedback is not supported; Indicates that within a time window Each SL slot has a PSFCH feedback slot. Figure 4 shows the physical resource slots for the PSFCH, with the PSFCH occupying the last two symbols before the GAP. The parameter sl-MinTimeGapPSFCH indicates the minimum gap between the PSFCH and the corresponding PSSCH in the resource pool configuration, and can take a value of 2 or 3.

[0096] Figure 6 is a schematic diagram of the frequency domain resource location of a PSFCH provided in an embodiment of the present application. The resource pool is configured with a bit map of the PSFCH frequency domain resources to indicate whether a specific PRB on the frequency domain resources where the resource pool is located can be used as a PSFCH resource, that is, the length of the bit information contained in the bit map is equal to the number of PRBs in the resource pool. 1 in the bit map indicates that the corresponding PRB can be used for PSFCH transmission, and bit 0 indicates that the corresponding PRB resource cannot be used for PSFCH transmission. In particular, PSFCH resources can be used for HARQ-ACK transmission, and its resources are represented by the "sl-PSFCH-RB-Set" bitmap. The bit value of 1 in the bitmap indicates that the PRB resource corresponding to it can be used as HAQR-ACK feedback. PSFCH resources can also be used for Scheme 2 conflict indication. Its resources are represented by the "sl-RB-SetPSFCH" bitmap. The bitmap is 1 to indicate that its corresponding PRB resource can be used as scheme 2 conflict indication. It should be noted that the positions with bit values ​​of 1 in "sl-PSFCH-RB-Set" and "sl-RB-SetPSFCH" do not overlap. As shown in Figure 5, in a time slot with PSFCH transmission resources, assuming that a subchannel contains 10 PRBs and there are 3 subchannels in the resource pool, the bit map indicating the PSFCH frequency domain resources in the resource pool contains a total of 3*10=30 bits, each indicating whether each PRB can be used for PSFCH transmission. The bit map indicates that the first 4 PRBs in the resource pool can be used for PSFCH feedback. According to the configuration of bitmap "sl-PSFCH-RB-Set" and "sl-RB-SetPSFCH", these 4 PRB resources can be used to transmit HARQ-ACK feedback or to transmit inter-UE coordination (IUC) scheme 2 conflict indication.

[0097] 7. PSFCH sequence

[0098] The PSFCH is based on a low peak-to-average ratio (PAR) ZC sequence. It supports multiple users using 12 different α values ​​to generate distinguishable PSFCH sequences. Each PSFCH sequence is code-division multiplexed and transmitted on a single RB. Because the UE needs to provide ACK and NACK information, each user is assigned at least two sequences, each corresponding to a different α value. The phase rotation value α is determined by the following formula.

[0099] Indicates the number of subcarriers in an RB. NR defines this value as 12. Indicates the slot number corresponding to the current subcarrier spacing μ in a radio frame; l represents the OFDM symbol number on the PSFCH transmission slot, l=0 represents the first OFDM symbol of the current PSFCH transmission resource; l' represents the symbol index relative to the first OFDM symbol on the current PSFCH transmission resource. m0 represents the phase of the ACK in a PSFCH feedback resource pair, m cs Indicates the phase offset of the NACK sequence relative to the ACK sequence in a PSFCH feedback resource pair. NR-V2X supports physical layer PSFCH feedback in unicast and multicast scenarios. For different service types, m cs The values ​​are determined according to Table 1 and Table 2.

[0100] Table 1

[0101] Table 2

[0102] 8. Unlicensed spectrum

[0103] In unlicensed spectrum, listen-before-talk (LBT) access typically uses energy-based detection and signal type detection. Energy-based detection requires a detection threshold. When the detected energy exceeds the threshold, the channel is considered busy and access is denied. If the detected energy remains below the threshold for a period of time, access is permitted.

[0104] According to national and regional regulations on the use of unlicensed frequency bands, taking the 5GHz band as an example, accessing a 20MHz channel requires meeting at least the minimum occupied channel bandwidth (OCB) requirement before the channel can be occupied. Generally, the minimum OCB must be at least 80% of the normal bandwidth. Taking 20MHz as an example, this means that at least 16MHz of bandwidth must be occupied to seize the 20MHz channel. The 3GPP NR-U system introduces the concept of interlaced resource blocks (IRBs), defining interlace m∈{0,1,…,M-1} as consisting of multiple RBs {m,M+m,2M+m,3M+m,…}. When the subcarrier spacing is 15kHz, M=10, and when the subcarrier spacing (SCS) is 30kHz, M=5. FIG7 is a schematic diagram of an interleaved resource block provided in an embodiment of the present application. For a 15 kHz SCS, there are 10 interlaces. In interlace #1, each channel uses the 10th RB, for example, RB #1, RB #11, ..., RB #91.

[0105] In the SL unlicensed spectrum, in order to increase the feedback opportunities of PSFCH in order to avoid LBT failure, a one-to-many mapping is introduced for the resources on the same RP, that is, N feedback opportunities are introduced for one PSCCH / PSSCH transmission. Figure 8 is a schematic diagram of the relationship between one-to-one mapping and one-to-many mapping provided by an embodiment of the present application. Figure 8 (a) shows a schematic diagram of the relationship between one-to-one mapping, where the PSCCH / PSSCH of time slots 3, 4, 5 and 6 corresponds to the PSFCH of time slot 8; the PSCCH / PSSCH of time slots 7, 8, 9 and 10 corresponds to the PSFCH of time slot 12. All transmitted PSFCHs include the same bitmap, that is, the first bitmap of the PSFCH of time slot 8, the second bitmap of the PSFCH of time slot 12 and the third bitmap of the PSFCH of time slot 16 are the same. Figure 8(b) shows a schematic diagram of the one-to-many mapping relationship. The PSCCH / PSSCH in time slots 3, 4, 5, and 6 correspond to the first, second, and third bitmaps in time slots 8, 12, and 16, respectively. This means that one PSCCH / PSSCH transmission introduces three feedback opportunities. The use of different bitmaps for different time slots is for illustrative purposes only. The PSFCH in time slots 8, 12, and 16 can also be configured using a single bitmap. The specific mapping relationship between each feedback opportunity and the PSCCH / PSSCH is the same; the one-to-many mapping only changes the mapping relationship between the frequency domain resources and the PSCCH / PSSCH in each time slot.

[0106] LTE-V2X does not support the PSFCH feedback mechanism. If the transceiver capabilities between terminal devices do not match, the number of carriers received by the terminal device will be greater than the number of carriers that the terminal device can send, and the terminal device will not be able to provide feedback on the data on all received carriers. Figure 9 is a schematic diagram of a mismatch in transceiver capabilities between terminal devices provided by an embodiment of the present application. UE 1 sends PSCCH / PSSCH on 4 CCs, and UE 2 can receive data on 4 CCs, but due to capability limitations, it can only provide feedback on data on 2 CCs (send PSFCH). In this case, UE2 cannot provide feedback on the data on CC3 and CC4, and the reliability of data transmission cannot be guaranteed.

[0107] Based on the above problems, an embodiment of the present application provides a communication method and a communication device, which feed back data of multiple carriers through a physical sidelink feedback channel on one carrier, thereby ensuring the reliability of data transmission.

[0108] FIG10 is a schematic diagram of a communication method provided in an embodiment of the present application. As shown in FIG10 , the method may include step S1010 and step S1020.

[0109] S1010, the first terminal device receives N first data, where the N first data are data carried on the PSSCH of T carriers; correspondingly, the second terminal device sends N first data.

[0110] Among them, any one of the T carriers can be a structure as shown in Figure 11, and any carrier CC can include a bandwidth part BWP, and a bandwidth part BWP can include multiple resource pools RP, such as RP1 and RP2 shown in Figure 11. The bandwidth part of any one carrier can be configured with a corresponding subcarrier spacing, and the subcarrier spacing of the bandwidth parts corresponding to the T carriers can be the same or different. The resource pool corresponding to any carrier can be configured with corresponding resource pool information. The resource pool information may include first information and second information. The first information indicates the minimum gap between the PSFCH configured by the resource pool and the corresponding PSSCH, for example, the first information may be sl-MinTimeGapPSFCH. The second information indicates the PSFCH feedback period configured by the resource pool, for example, the second information may be The resource pool information configured in the resource pools included in the T carriers may be the same or different.

[0111] S1020, the first terminal device sends at least one PSFCH on the first carrier among T carriers, and the at least one PSFCH carries feedback information, and the feedback information is feedback information of N first data, where N is a positive integer greater than or equal to 2, 2≤T≤N; correspondingly, the second terminal device receives the first carrier.

[0112] In some implementations, before step S1010, the method shown in FIG10 may further include:

[0113] A first carrier is determined from among the T carriers, where the PSFCH time-domain density of the first carrier is greater than or equal to that of any other carrier among the T carriers. The PSFCH time-domain density is determined based on the PSFCH feedback period configured in the carrier's resource pool and / or the subcarrier spacing corresponding to the carrier's bandwidth portion. This allows PSFCH to be sent on the carrier with higher time-domain density to provide feedback to the carrier with lower time-domain density, thus avoiding PSFCH resource congestion. The larger the subcarrier spacing corresponding to the carrier's bandwidth portion, the higher the PSFCH density; and the larger the PSFCH feedback period configured in the carrier's resource pool, the larger the PSFCH density. Assuming the number of PSFCH symbols per ms is used as the criterion for determining the PSFCH time-domain density, for example, if the subcarrier spacing corresponding to the carrier's bandwidth portion is 15 kHz and the PSFCH feedback period configured in the carrier's resource pool is 2, then the feedback time-domain density is 0.5. For example, if the subcarrier spacing corresponding to the carrier's bandwidth portion is 30 kHz and the PSFCH feedback period configured in the carrier's resource pool is 2, then the feedback time-domain density is 1.

[0114] In the method shown in FIG10 , the PSSCH of at least two carriers is fed back through the PFSCH on one carrier. Thus, when the first terminal device is limited in capability and cannot provide feedback on all received carriers, data of multiple carriers can be fed back simultaneously using one carrier to ensure the reliability of data transmission.

[0115] Among them, there may be a mapping relationship between the multiple carriers fed back by the first terminal device. The mapping relationship may be configured between terminal devices, or pre-configured, or pre-defined. It is understandable that "pre-defined" can be understood as a standard definition, which does not require other equipment configuration (and the network equipment or other terminal equipment cannot be changed), and is information recorded / written in advance in the hardware and / or software of the terminal device itself. "Configuration" is divided into network device configuration and terminal device configuration. If it is a network device configuration, it can be changed through SIB or RRC signaling; if it is a terminal device configuration, it can be changed according to PC5-RRC signaling. "Pre-configuration" can be understood as information recorded / written in advance in the hardware and / or software of the UE itself, which is determined by the manufacturer of the equipment and can be changed through software or hardware. Specifically, the PSFCH sent by the first terminal device on one carrier can be mapped to the PSSCH on multiple carriers. The PSFCH mapping relationship can be configured through PC5-RRC, or MAC CE, or SCI (configuration between UEs), or through network (pre) configuration, and is predefined by the standard protocol. This application does not limit this. Figure 12 is a schematic diagram of a mapping relationship between multiple carriers provided in an embodiment of the present application. The SCSs configured for the BWP of CC1, CC2, CC3, and CC4 may be the same or different. The PSFCH on the resource pool of CC1 may be used to send feedback information, which is feedback information of data sent on CC1, CC2, and CC3.

[0116] In the method shown in Figure 10, the time domain position of at least one PSFCH can be determined based on the resource pool configuration information of T carriers, and the resource pool configuration information includes first information, and the first information indicates the minimum gap between the PSFCH configured by the resource pool and the corresponding PSSCH. This ensures that the PSFCH sent by the first terminal device meets the time constraint conditions and correctly feeds back the first data on the T carriers. In some implementations, the resource pool configuration information also includes second information, and the second information indicates the PSFCH feedback period configured by the resource pool. This ensures that the PSFCH sent by the first terminal device meets the time constraint conditions and correctly feeds back the first data on the T carriers.

[0117] Specifically, the time domain position of at least one PSFCH may be one of the following two situations:

[0118] First case:

[0119] At least one PSFCH is a PSFCH. The end position of the time slot in which the PSFCH resides is aligned with the end position of the first time slot in the time domain. The first time slot is the Kth time slot after the time slot in which the first PSSCH resides. K ≥ P. The first PSSCH carries any one of the N first data. The first time slot and the first PSSCH are located in the same resource pool of the same carrier. P is the minimum gap between the PSFCH and the corresponding PSSCH configured in the resource pool in which the first PSSCH resides.

[0120] That is, the distance between the time domain position of the PSFCH sent by the first terminal device and the time slot of any PSSCH carrying the first data is greater than the minimum gap between the PSFCH and the corresponding PSSCH configured in its resource pool, thereby ensuring that the PSFCH sent by the first terminal device meets the time constraint conditions and correctly feeds back the first data on T carriers.

[0121] Second case:

[0122] When the at least one PSFCH is one or more PSFCHs, in the time domain, the time slot where each PSFCH in the at least one PSFCH is located is located after the first time slot or the end position of the time slot where each PSFCH in the at least one PSFCH is located is aligned with the end position of the first time slot, and the time slot where each PSFCH in the at least one PSFCH is located is located before the second time slot;

[0123] Among them, the first time slot is located at the Kth time slot after the time slot where the first PSSCH is located, K≥P, the first PSSCH carries any first data among N first data, the second time slot is located at the Lth time slot after the first time slot, the first time slot, the second time slot and the first PSSCH are located in the same resource pool of the same carrier, P is the minimum gap between the PSFCH and the corresponding PSSCH configured in the resource pool of the carrier where the first PSSCH is located, and L is the PSFCH feedback period configured in the resource pool where the first PSSCH is located.

[0124] That is, the distance between the time domain position of one or more PSFCHs sent by the first terminal device and the time slot of any PSSCH carrying the first data is greater than the minimum gap between the PSFCH and the corresponding PSSCH configured in its resource pool, and is located before the next PSFCH feedback cycle, thereby ensuring that the PSFCH sent by the first terminal device meets the time constraint conditions and ensures that there is no repetition between cycles, thereby correctly feeding back the first data on T carriers.

[0125] In the first and second cases, at least one PSFCH includes corresponding feedback information for the first data carried on the second PSSCH, where the second PSSCH and the first time slot are located in the same resource pool, the second PSSCH is located in the Mth time slot before the first time slot, P≤M≤P+a×L, where a is a positive integer and L is the PSFCH feedback period configured for the resource pool where the second PSSCH is located. Thus, at least one PSFCH can be used to reflect the first data on the PSSCH within the corresponding PSFCH feedback period on T carriers, as well as the first data on the PSSCH before the feedback period. This ensures non-duplication between cycles and correct feedback of the first data on the T carriers when time domain resources on the first carrier are limited.

[0126] In some cases, a is equal to 1, so that the first data is fed back in time.

[0127] The following describes the PSFCH mapping relationship.

[0128] In some implementations, each PSFCH in at least one PSFCH includes at least N frequency domain resource sets, the N frequency domain resource sets correspond one-to-one to the N first data, and each frequency domain resource set in the N frequency domain resource sets is used to carry feedback information of the corresponding first data. Among them, the N frequency domain resource sets do not overlap, and can also be understood as the N frequency domain resource sets being orthogonal. Among them, the frequency domain resources included in each resource set can carry feedback information of the first data or not, and this application does not impose any restrictions on this. In this implementation, each PSFCH sent by the first terminal device on the first carrier needs to include a frequency domain resource set corresponding to the N first data, so that one carrier is used to feedback data on T carriers to achieve reliable data transmission.

[0129] In some implementations, at least one PSFCH includes at least N frequency domain resource sets, the N frequency domain resource sets correspond one-to-one to the N first data, and each frequency domain resource set in the N frequency domain resource sets is used to carry the feedback information of the corresponding first data. Among them, the N frequency domain resource sets do not overlap, and can also be understood as the N frequency domain resources being orthogonal. Among them, the frequency domain resources included in each resource set can carry the feedback information of the first data or not, and this application does not impose any restrictions on this. In this implementation, one or more PSFCHs sent by the first terminal device on the first carrier need to include frequency domain resource sets corresponding to the N first data, that is, in the case of sending multiple PSFCHs, each PSFCH can carry the feedback information of a part of T carriers, thereby using one carrier to feedback the data on T carriers to achieve reliable data transmission.

[0130] In some implementations, each PSFCH in at least one PSFCH includes M first frequency domain resource sets, the M first frequency domain resource sets correspond to the second data, each first frequency domain resource set in the M first frequency domain resource sets is used to carry feedback information of the second data, the second data is the first data in the N first data, the M first frequency domain resource sets do not overlap, and M is a positive integer greater than or equal to 2. Among them, the frequency domain resources included in each resource set may carry feedback information of the first data or not, and this application does not impose any restrictions on this. That is, the PSFCH sent by the first terminal device includes multiple frequency domain resource sets mapped to the same first data, that is, one-to-many mapping, which introduces multiple feedback opportunities for one first data, and each frequency domain resource set has the same mapping relationship with the first data, thereby avoiding LBT failure within the frequency band (especially the SL unlicensed band).

[0131] The method shown in FIG10 of the present application is described below with reference to specific embodiments. For the convenience of explanation, the following lists a specific embodiment of sending PSFCH on one CC to simultaneously feed back the first data of CC1 and CC2.

[0132] Figure 13 is a schematic diagram of a mapping relationship between CC1 and CC2 provided in an embodiment of the present application. Assume that the SCS configured for CC1's BWP is 15 kHz and the SCS configured for CC2's BWP is 60 kHz, and that CC1's SCS is smaller than CC2's SCS. The minimum gap between the RP-configured PSFCH included in CC1 and the corresponding PSSCH is 2, and the PSFCH feedback period is 2. The minimum gap between the RP-configured PSFCH included in CC2 and the corresponding PSSCH is 2, and the PSFCH feedback period is 2.

[0133] The first terminal device receives the first data on CC1 and CC2. The first data is carried on the PSSCH of CC1 and CC2. The transmission capability of the first terminal device is limited, and it is necessary to simultaneously feedback the first data on CC1 and CC2 through CC2. According to the mapping rules between PSSCH and PSFCH: on CC1, the first data carried on the PSSCH in time slots 1 to 2 corresponds to the PSFCH feedback timing in time slot 4 of CC1. On CC2, the first data carried on the PSSCH in time slots 13 to 14 corresponds to the PSFCH feedback timing in time slot 16 of CC2.

[0134] As a PSFCH mapping relationship, the end position of time slot 16 on CC2 is aligned with the end position of time slot 4 on CC1. The first terminal device selects time slot 16 on CC2 to send PSFCH. The PSFCH includes two frequency domain resource sets, and the two frequency domain resource sets are each used to carry the feedback information of a CC. The two frequency domain resources do not overlap, and the two frequency domain resources can correspond to the first bitmap and the second bitmap respectively, or the two frequency domain resources can also correspond to one bitmap. This application does not impose any restrictions on this.

[0135] Figure 14 is a schematic diagram of another mapping relationship between CC1 and CC2 provided in an embodiment of the present application. Assume that the SCS configured for CC1's BWP is 15 kHz and the SCS configured for CC2's BWP is 60 kHz, and that CC1's SCS is smaller than CC2's SCS. The minimum gap between the RP-configured PSFCH included in CC1 and the corresponding PSSCH is 2, and the PSFCH feedback period is 2. The minimum gap between the RP-configured PSFCH included in CC2 and the corresponding PSSCH is 2, and the PSFCH feedback period is 2.

[0136] The first terminal device receives the first data on CC1 and CC2. The first data is carried on the PSSCH of CC1 and CC2. The transmission capability of the first terminal device is limited, and it is necessary to simultaneously feedback the first data on CC1 and CC2 through CC2. According to the mapping rules between PSSCH and PSFCH: on CC1, the first data carried on the PSSCH in time slots 1 to 2 corresponds to the PSFCH feedback timing in time slot 4 of CC1. On CC2, the first data carried on the PSSCH in time slots 13 to 14 corresponds to the PSFCH feedback timing in time slot 16 of CC2.

[0137] As a way of PSFCH mapping relationship, the end position of time slot 16 on CC2 is aligned with the end position of time slot 4 on CC1, and time slot 22 on CC2 is located before the next PSFCH feedback opportunity of time slot 6 on CC1. The first terminal device selects time slots 16, 18, 20 and 22 on CC2 to send PSFCH, or the first terminal device selects part of time slots 16, 18, 20 and 22 on CC2 to send PSFCH. The PSFCH sent in time slots 16, 18, 20 and 22 includes feedback information of the first data corresponding to the first carrier. The PSFCH includes two frequency domain resource sets, each used to carry the feedback information of one CC, and the two frequency domain resources do not overlap. In addition, the PSFCH sent in time slots 16, 18, 20 and 22 can each carry a part of the feedback information corresponding to CC2. Among them, the two frequency domain resource sets can correspond to two bitmaps, the first bitmap and the second bitmap, or the two frequency domain resource sets can also correspond to 1 bitmap, and this application does not impose any restrictions on this.

[0138] Figure 15 is a schematic diagram of another mapping relationship between CC1 and CC2 provided in an embodiment of the present application. Assume that the SCS configured for CC1's BWP is 15 kHz and the SCS configured for CC2's BWP is 30 kHz, and that CC1's SCS is smaller than CC2's SCS. The minimum gap between the RP-configured PSFCH included in CC1 and the corresponding PSSCH is 1, and the PSFCH feedback period is 2. The minimum gap between the RP-configured PSFCH included in CC2 and the corresponding PSSCH is 2, and the PSFCH feedback period is 4.

[0139] The first terminal device receives the first data on CC1 and CC2, and the first data is carried on PSSCH. The transmission capability of the first terminal device is limited, and it is necessary to simultaneously feedback the first data on CC1 and CC2 through CC2. However, at this time, there are fewer PSFCH feedback opportunities on CC1. According to the mapping rules between PSSCH and PSFCH: on CC1, the first data carried on the PSSCH in time slot 1 corresponds to the PSFCH feedback opportunity on time slot 3 of CC1, and the first data carried on the PSSCH in time slot 2 corresponds to the PSFCH feedback opportunity on time slot 4 of CC1. On CC2, the first data carried on the PSSCH in time slots 3 to 6 corresponds to the PSFCH feedback opportunity on time slot 8 of CC2.

[0140] As a way of PSFCH mapping relationship, the end position of time slot 8 on CC2 is aligned with the end position of time slot 4 on CC1. The first terminal device selects time slot 8 on CC2 to send PSFCH, and the PSFCH includes feedback information of the first data carried on the PSSCH of CC1 time slot 1, feedback information of the first data on the PSSCH of CC1 time slot 2, and feedback information of the first data on CC2. That is, the PSFCH, on the basis of feeding back the first data on CC2, simultaneously feeds back the first data to be fed back at the aligned PSFCH feedback opportunity on CC1, and the first data to be fed back at the previous PSFCH feedback opportunity of CC1. The PSFCH includes three frequency domain resource sets, two of which correspond to CC1, and one frequency domain resource set corresponds to CC2, and the three frequency domain resources do not overlap. Among them, the three frequency domain resource sets can correspond to three bitmaps, the first bitmap, the second bitmap and the third bitmap, or the three frequency domain resource sets can also correspond to one bitmap, and this application does not impose any restrictions on this.

[0141] Figure 16 is a schematic diagram of another mapping relationship between CC1 and CC2 provided in an embodiment of the present application. Assume that the SCS configured for CC1's BWP is 15 kHz and the SCS configured for CC2's BWP is 30 kHz, and that CC1's SCS is smaller than CC2's SCS. The minimum gap between the RP-configured PSFCH included in CC1 and the corresponding PSSCH is 2, and the PSFCH feedback period is 2. The minimum gap between the RP-configured PSFCH included in CC2 and the corresponding PSSCH is 2, and the PSFCH feedback period is 2.

[0142] The first terminal device receives the first data on CC1 and CC2. The first data is carried on the PSSCH on CC1 and CC2. The transmission capability of the first terminal device is limited, and it is necessary to simultaneously feedback the first data on CC1 and CC2 through CC1. According to the mapping rule between PSSCH and PSFCH: on CC1, the first data carried on the PSSCH in time slots 1 to 2 corresponds to the PSFCH feedback opportunity on time slot 4 of CC1. On CC2, the first data carried on the PSSCH in time slots 1 to 2 corresponds to the PSFCH feedback opportunity on time slot 4 of CC2, the first data carried on the PSSCH in time slots 3 to 4 corresponds to the PSFCH feedback opportunity on time slot 6 of CC2, and the first data carried on the PSSCH in time slots 5 to 6 corresponds to the PSFCH feedback opportunity on time slot 8 of CC2.

[0143] As a way of PSFCH mapping relationship, the end position of time slot 4 on CC1 is aligned with the end position of time slot 8 on CC2. The first terminal device selects time slot 4 on CC1 to send PSFCH, and the PSFCH includes feedback information of the first data carried on PSSCH of CC1 time slots 1 to 2, feedback information of the first data carried on PSSCH of CC2 time slots 1 to 2, and feedback information of the first data carried on PSSCH of CC2 time slots 3 to 4. The PSFCH includes three frequency domain resource sets, one of which corresponds to CC1, two of which correspond to CC2, and the three frequency domain resources do not overlap. Among them, the three frequency domain resource sets can correspond to three bitmaps, the first bitmap, the second bitmap and the third bitmap, or the three frequency domain resource sets can also correspond to one bitmap, and this application does not impose any restrictions on this.

[0144] Figure 17 is a schematic diagram of another mapping relationship between CC1 and CC2 provided in an embodiment of the present application. Assume that the SCS configured for CC1's BWP is 15 kHz and the SCS configured for CC2's BWP is 30 kHz, and that CC1's SCS is smaller than CC2's SCS. The minimum gap between the RP-configured PSFCH included in CC1 and the corresponding PSSCH is 2, and the PSFCH feedback period is 2. The minimum gap between the RP-configured PSFCH included in CC2 and the corresponding PSSCH is 2, and the PSFCH feedback period is 2.

[0145] The first terminal device receives the first data on CC1 and CC2. The first data is carried on the PSSCH on CC1 and CC2. The transmission capability of the first terminal device is limited, and it is necessary to simultaneously feedback the first data on CC1 and CC2 through CC1. According to the mapping rule between PSSCH and PSFCH: on CC1, the first data carried on the PSSCH in time slots 1 to 2 corresponds to the PSFCH feedback opportunity on time slot 4 of CC1. On CC2, the first data carried on the PSSCH in time slots 1 to 2 corresponds to the PSFCH feedback opportunity on time slot 4 of CC2, the first data carried on the PSSCH in time slots 3 to 4 corresponds to the PSFCH feedback opportunity on time slot 6 of CC2, and the first data carried on the PSSCH in time slots 5 to 6 corresponds to the PSFCH feedback opportunity on time slot 8 of CC2.

[0146] As a way of PSFCH mapping relationship, the end position of time slot 4 on CC1 is aligned with the end position of time slot 8 on CC2. The first terminal device selects time slot 4 on CC1 to send PSFCH, and the PSFCH includes feedback information of the first data carried on PSSCH of CC1 time slots 1 to 2, feedback information of the first data carried on PSSCH of CC2 time slots 3 to 4, and feedback information of the first data carried on PSSCH of CC2 time slots 5 to 6. The PSFCH includes three frequency domain resource sets, one of which corresponds to CC1, two of which correspond to CC2, and the three frequency domain resources do not overlap. Among them, the three frequency domain resource sets can correspond to three bitmaps, the first bitmap, the second bitmap and the third bitmap, or the three frequency domain resource sets can also correspond to one bitmap, and this application does not impose any restrictions on this.

[0147] Figure 18 is a schematic diagram of another mapping relationship between CC1 and CC2 provided in an embodiment of the present application. In the method embodiments as shown in Figures 13 to 17, a one-to-many mapping method can also be adopted, that is, multiple frequency domain resource sets are used to feed back the first data on the same PSSCH. For example, the first terminal device sends PSFCH in time slots 16, 24 and 32 on CC2, and the PSFCH includes four frequency domain resource sets, of which three frequency domain resource sets correspond to CC1, one frequency domain resource set corresponds to CC2, and the four frequency domain resources do not overlap. Among them, the four frequency domain resource sets can correspond to four bitmaps, the first bitmap, the second bitmap, the third bitmap and the fourth bitmap, or the four frequency domain resource sets can also correspond to 1 bitmap, and this application does not limit this.

[0148] The above describes the method embodiment of the embodiment of the present application. The corresponding device embodiment is introduced below. The method embodiment and the device embodiment correspond to each other, so the parts not described in detail can refer to each other.

[0149] FIG19 is a schematic diagram of a communication device provided in an embodiment of the present application. The device may include a transceiver module 1910 and a processing module 1920. The communication device may refer to a first terminal device, wherein:

[0150] The transceiver module 1910 is configured to receive N first data, where the N first data are data carried on the PSSCHs of T carriers, and the N first data correspond one-to-one to the T carriers.

[0151] Among them, any one carrier CC among the T carriers may include a bandwidth part BWP, and a bandwidth part BWP may include multiple resource pools RP. The bandwidth part of any one carrier may be configured with a corresponding subcarrier spacing, and the subcarrier spacing of the bandwidth parts corresponding to the T carriers may be the same or different. The resource pool corresponding to any carrier may be configured with corresponding resource pool information. The resource pool information may include first information and second information. The first information indicates the minimum gap between the PSFCH configured by the resource pool and the corresponding PSSCH, and the first information may be sl-MinTimeGapPSFCH. The second information indicates the PSFCH feedback period configured by the resource pool, and the second information may be The resource pool information configured in the resource pools included in the T carriers may be the same or different.

[0152] The transceiver module 1910 is also used to send at least one PSFCH on the first carrier among T carriers, and the at least one PSFCH carries feedback information, which is feedback information of N first data, where N is a positive integer greater than or equal to 2; correspondingly, the second terminal device receives the first carrier.

[0153] In some implementations, processing module 1920 may be configured to determine a first carrier among T carriers, where the PSFCH time-domain density of the first carrier is greater than or equal to any other carrier among the T carriers. The PSFCH time-domain density is determined based on the PSFCH feedback period configured in the carrier's resource pool and / or the subcarrier spacing corresponding to the carrier's bandwidth portion. This allows PSFCH to be transmitted on the carrier with higher time-domain density to provide feedback to the carrier with lower time-domain density, thereby avoiding PSFCH resource congestion. The larger the subcarrier spacing corresponding to the carrier's bandwidth portion, the higher the PSFCH density; and the larger the PSFCH feedback period configured in the carrier's resource pool, the larger the PSFCH density. Assuming the number of PSFCH symbols per ms is used as the criterion for determining the PSFCH time-domain density, for example, if the subcarrier spacing corresponding to the carrier's bandwidth portion is 15 kHz and the PSFCH feedback period configured in the carrier's resource pool is 2, then the feedback time-domain density is 0.5. For example, if the subcarrier spacing corresponding to the carrier's bandwidth portion is 30 kHz and the PSFCH feedback period configured in the carrier's resource pool is 2, then the feedback time-domain density is 1.

[0154] In the device shown in Figure 19, the PSSCH of at least two carriers is fed back through the PFSCH on one carrier. Therefore, when the first terminal device is limited by its capabilities and cannot provide feedback on all received carriers, one carrier can be used to simultaneously feed back data from multiple carriers to ensure the reliability of data transmission.

[0155] Among them, there may be a mapping relationship between the multiple carriers fed back. The feedback relationship may be configured between terminal devices, or pre-configured, or pre-defined. Specifically, the PSFCH sent by the first terminal device on one carrier may be mapped to the PSSCH on multiple carriers. The PSFCH mapping relationship may be configured through PC5-RRC, or MAC CE, or SCI (inter-UE configuration), or through network (pre) configuration, and the standard protocol is predefined, and this application does not impose any restrictions on this.

[0156] In the device shown in Figure 19, the time domain position of at least one PSFCH can be determined based on the resource pool configuration information of T carriers, and the resource pool configuration information includes first information, which indicates the minimum gap between the PSFCH configured by the resource pool and the corresponding PSSCH. This ensures that the PSFCH sent by the first terminal device meets the time constraint conditions and correctly feeds back the first data on the T carriers. In some implementations, the resource pool configuration information also includes second information, which indicates the PSFCH feedback period configured by the resource pool. This ensures that the PSFCH sent by the first terminal device meets the time constraint conditions and correctly feeds back the first data on the T carriers.

[0157] Specifically, the time domain position of at least one PSFCH may be one of the following two situations:

[0158] First case:

[0159] At least one PSFCH is a PSFCH. The end position of the time slot in which the PSFCH resides is aligned with the end position of the first time slot in the time domain. The first time slot is the Kth time slot after the time slot in which the first PSSCH resides. K ≥ P. The first PSSCH carries any one of the N first data. The first time slot and the first PSSCH are located in the same resource pool of the same carrier. P is the minimum gap between the PSFCH and the corresponding PSSCH configured in the resource pool in which the first PSSCH resides.

[0160] That is, the distance between the time domain position of the PSFCH sent by the first terminal device and the time slot of any PSSCH carrying the first data is greater than the minimum gap between the PSFCH and the corresponding PSSCH configured in its resource pool, thereby ensuring that the PSFCH sent by the first terminal device meets the time constraint conditions and correctly feeds back the first data on T carriers.

[0161] Second case:

[0162] When the at least one PSFCH is one or more PSFCHs, in the time domain, the time slot where each PSFCH in the at least one PSFCH is located is located after the first time slot or the end position of the time slot where each PSFCH in the at least one PSFCH is located is aligned with the end position of the first time slot, and the time slot where each PSFCH in the at least one PSFCH is located is located before the second time slot;

[0163] Among them, the first time slot is located at the Kth time slot after the time slot where the first PSSCH is located, K≥P, the first PSSCH carries any first data among N first data, the second time slot is located at the Lth time slot after the first time slot, the first time slot, the second time slot and the first PSSCH are located in the same resource pool of the same carrier, P is the minimum gap between the PSFCH and the corresponding PSSCH configured in the resource pool of the carrier where the first PSSCH is located, and L is the PSFCH feedback period configured in the resource pool where the first PSSCH is located.

[0164] That is, the distance between the time domain position of one or more PSFCHs sent by the first terminal device and the time slot of any PSSCH carrying the first data is greater than the minimum gap between the PSFCH and the corresponding PSSCH configured in its resource pool, and is located before the next PSFCH feedback cycle, thereby ensuring that the PSFCH sent by the first terminal device meets the time constraint conditions and ensures that there is no repetition between cycles, thereby correctly feeding back the first data on T carriers.

[0165] In the first and second cases, at least one PSFCH includes corresponding feedback information for the first data carried on the second PSSCH, where the second PSSCH and the first time slot are located in the same resource pool, the second PSSCH is located in the Mth time slot before the first time slot, P≤M≤P+a×L, where a is a positive integer and L is the PSFCH feedback period configured for the resource pool where the second PSSCH is located. Thus, at least one PSFCH can be used to reflect the first data on the PSSCH within the corresponding PSFCH feedback period on T carriers, as well as the first data on the PSSCH before the feedback period. This ensures non-duplication between cycles and correct feedback of the first data on the T carriers when time domain resources on the first carrier are limited.

[0166] In some cases, a is equal to 1, so that the first data is fed back in time.

[0167] The following describes the PSFCH mapping relationship.

[0168] In some implementations, each PSFCH in at least one PSFCH includes at least N frequency domain resource sets, the N frequency domain resource sets correspond one-to-one to the N first data, and each frequency domain resource set in the N frequency domain resource sets is used to carry feedback information of the corresponding first data. Among them, the N frequency domain resource sets do not overlap, and can also be understood as the N frequency domain resource sets being orthogonal. Among them, the frequency domain resources included in each resource set can carry feedback information of the first data or not, and this application does not impose any restrictions on this. In this implementation, each PSFCH sent by the first terminal device on the first carrier needs to include a frequency domain resource set corresponding to the N first data, so that one carrier is used to feedback data on T carriers to achieve reliable data transmission.

[0169] In some implementations, at least one PSFCH includes at least N frequency domain resource sets, the N frequency domain resource sets correspond one-to-one to the N first data, and each frequency domain resource set in the N frequency domain resource sets is used to carry the feedback information of the corresponding first data. Among them, the N frequency domain resource sets do not overlap, and can also be understood as the N frequency domain resources being orthogonal. Among them, the frequency domain resources included in each resource set can carry the feedback information of the first data or not, and this application does not impose any restrictions on this. In this implementation, one or more PSFCHs sent by the first terminal device on the first carrier need to include frequency domain resource sets corresponding to the N first data, that is, in the case of sending multiple PSFCHs, each PSFCH can carry the feedback information of a part of T carriers, thereby using one carrier to feedback the data on T carriers to achieve reliable data transmission.

[0170] In some implementations, each PSFCH in at least one PSFCH includes M first frequency domain resource sets, the M first frequency domain resource sets correspond to the second data, each first frequency domain resource set in the M first frequency domain resource sets is used to carry feedback information of the second data, the second data is the first data in the N first data, the M first frequency domain resource sets do not overlap, and M is a positive integer greater than or equal to 2. Among them, the frequency domain resources included in each resource set may carry feedback information of the first data or not, and this application does not impose any restrictions on this. That is, the PSFCH sent by the first terminal device includes multiple frequency domain resource sets mapped to the same first data, that is, one-to-many mapping, which introduces multiple feedback opportunities for one first data, and each frequency domain resource set has the same mapping relationship with the first data, thereby avoiding LBT failure within the frequency band (especially the SL unlicensed band).

[0171] FIG20 is a schematic diagram of a communication device provided in an embodiment of the present application. The communication device may refer to a first terminal device, and the device may include a transceiver module 2010 and a processing module 2020.

[0172] The transceiver module 2010 is used to send N first data, where the N first data are data carried on the PSSCHs of T carriers, and the N first data correspond to the T carriers one-to-one.

[0173] Among them, the specific form of the N first data sent is similar to the N first data described in Figure 19, and will not be repeated here.

[0174] The transceiver module 2010 is also used to receive at least one PSFCH on the first carrier among T carriers, and the at least one PSFCH carries feedback information, which is feedback information of N first data, where N is a positive integer greater than or equal to 2; correspondingly, the second terminal device receives the first carrier.

[0175] The specific form of the at least one PSFCH received is similar to that in FIG19 and will not be repeated here.

[0176] In some implementations, the processing module 2020 may be configured to determine a first carrier among the T carriers, wherein the PSFCH time-domain density of the first carrier is greater than or equal to any other carrier among the T carriers. The PSFCH time-domain density is determined based on the PSFCH feedback period configured in the carrier's resource pool and / or the subcarrier spacing corresponding to the carrier's bandwidth portion. Thus, PSFCH is sent on a carrier with a higher time-domain density to provide feedback to a carrier with a lower time-domain density, thereby avoiding PSFCH resource congestion. The larger the subcarrier spacing corresponding to the carrier's bandwidth portion, the higher the PSFCH density; and the larger the PSFCH feedback period configured in the carrier's resource pool, the larger the PSFCH. Assuming that the number of PSFCH symbols per ms is used as the criterion for determining the PSFCH time-domain density, for example, if the subcarrier spacing corresponding to the carrier's bandwidth portion is 15 kHz and the PSFCH feedback period configured in the carrier's resource pool is 2, then the feedback time-domain density is 0.5. For example, if the subcarrier spacing corresponding to the carrier's bandwidth portion is 30 kHz and the PSFCH feedback period configured in the carrier's resource pool is 2, then the feedback time-domain density is 1.

[0177] In addition, an embodiment of the present application also provides a chip that obtains instructions and executes the instructions to implement the above method.

[0178] Optionally, as an implementation manner, the chip includes a processor and a communication interface, and the processor reads instructions stored in the memory through the communication interface to execute the above method.

[0179] Optionally, as an implementation manner, the chip may further include a memory, in which instructions are stored, and the processor is used to execute the instructions stored in the memory. When the instructions are executed, the processor is used to execute the above method.

[0180] An embodiment of the present application further provides a computer-readable storage medium, which stores instructions used in the method in the above method embodiment.

[0181] An embodiment of the present application also provides a computer program product comprising instructions for implementing the method in the above method embodiment.

[0182] An embodiment of the present application also provides a computer program product comprising instructions for implementing the method in the above method embodiment.

[0183] As used in this specification, the terms "component," "module," "system," and the like are used to represent computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and / or a computer. By way of illustration, both an application running on a computing device and a computing device can be a component. One or more components can reside in a process and / or an execution thread, and a component can be located on a computer and / or distributed between two or more computers. In addition, these components can be executed from various computer-readable media having various data structures stored thereon. Components can communicate, for example, via local and / or remote processes based on signals having one or more data packets (e.g., data from two components interacting with another component on a local system, a distributed system, and / or a network, such as the Internet interacting with other systems via signals).

[0184] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0185] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0186] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0187] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0188] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0189] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0190] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A sidelink communication method, characterized in that: include: Receiving N first data, where the N first data are data carried on a physical sidelink shared channel PSSCH of T carriers; At least one physical sidelink feedback channel PSFCH is sent on a first carrier among the T carriers, and the at least one PSFCH carries feedback information, and the feedback information is feedback information of the N first data, wherein N is a positive integer greater than or equal to 2, and 2≤T≤N.

2. The method according to claim 1, characterized in that The time domain position of the at least one PSFCH is determined according to the resource pool configuration information of the T carriers, and the resource pool configuration information includes first information, and the first information indicates the minimum gap between the PSFCH configured in the resource pool and the corresponding PSSCH.

3. The method according to claim 2, characterized in that The resource pool configuration information also includes second information, where the second information indicates a PSFCH feedback period configured in the resource pool.

4. The method according to any one of claims 1 to 3, characterized in that in: The at least one PSFCH is one PSFCH, and an end position of a time slot where the one PSFCH is located is aligned with an end position of the first time slot in a time domain position; Among them, the first time slot is located in the Kth time slot after the time slot where the first PSSCH is located, K≥P, the first PSSCH is a PSSCH carrying any one of the N first data, the first time slot and the first PSSCH are located in the same resource pool of the same carrier, and P is the minimum gap between the PSFCH and the corresponding PSSCH configured in the resource pool where the first PSSCH is located.

5. The method according to any one of claims 1 to 3, characterized in that in: In the time domain position, the time slot where each PSFCH in the at least one PSFCH is located is located after the first time slot or the end position of the time slot where each PSFCH in the at least one PSFCH is located is aligned with the end position of the first time slot, and the time slot where each PSFCH in the at least one PSFCH is located is located before the second time slot; Among them, the first time slot is located at the Kth time slot after the time slot where the first PSSCH is located, K≥P, the first PSSCH is a PSSCH carrying any one of the N first data, the second time slot is located at the Lth time slot after the first time slot, the first time slot, the second time slot and the first PSSCH are located in the same resource pool of the same carrier, P is the minimum gap between the PSFCH and the corresponding PSSCH configured in the resource pool of the carrier where the first PSSCH is located, and L is the PSFCH feedback period configured in the resource pool where the first PSSCH is located.

6. The method according to claim 4 or 5, characterized in that: The at least one PSFCH includes corresponding feedback information of the first data carried on the second PSSCH, wherein the second PSSCH and the first time slot are located in the same resource pool, the second PSSCH is located in the Mth time slot before the first time slot, P≤M≤P+a×L, a is a positive integer, and L is the PSFCH feedback period configured for the resource pool where the second PSSCH is located.

7. The method according to claim 6, characterized in that a is equal to 1.

8. The method according to any one of claims 1 to 7, characterized in that Each PSFCH in the at least one PSFCH includes at least N frequency domain resource sets, the N frequency domain resource sets correspond one-to-one to the N first data, and each frequency domain resource set in the N frequency domain resource sets is used to carry feedback information of the corresponding first data.

9. The method according to any one of claims 1 to 7, characterized in that The at least one PSFCH includes at least N frequency domain resource sets, the N frequency domain resource sets correspond one-to-one to the N first data, and each frequency domain resource set in the N frequency domain resource sets is used to carry feedback information of the corresponding first data.

10. The method according to claim 8 or 9, characterized in that: The N frequency domain resource sets do not overlap.

11. The method according to any one of claims 1 to 10, characterized in that The method further comprises: Determine the first carrier among the T carriers, where a PSFCH time domain density of the first carrier is greater than or equal to any other carrier among the T carriers; The PSFCH time domain density is determined according to the PSFCH feedback period configured by the resource pool of the carrier and / or the subcarrier spacing corresponding to the bandwidth part of the carrier.

12. A sidelink communication method, characterized in that: include: Sending N first data, where the N first data are data carried on a physical sidelink shared channel PSSCH of T carriers; At least one physical sidelink feedback channel PSFCH is received on a first carrier among the T carriers, wherein the at least one PSFCH Carrying feedback information, the feedback information is feedback information of the N first data, wherein N is a positive integer greater than or equal to 2, 2≤T≤N.

13. The method according to claim 12, characterized in that The time domain position of the at least one PSFCH is determined according to the resource pool configuration information of the T carriers, and the resource pool configuration information includes first information, and the first information indicates the minimum gap between the PSFCH configured in the resource pool and the corresponding PSSCH.

14. The method according to claim 13, characterized in that The resource pool configuration information also includes second information, where the second information indicates a PSFCH feedback period configured in the resource pool.

15. The method according to any one of claims 12 to 14, characterized in that in: The at least one PSFCH is one PSFCH, and an end position of a time slot where the one PSFCH is located is aligned with an end position of the first time slot in a time domain position; Among them, the first time slot is located in the Kth time slot after the time slot where the first PSSCH is located, K≥P, the first PSSCH is a PSSCH carrying any one of the N first data, the first time slot and the first PSSCH are located in the same resource pool of the same carrier, and P is the minimum gap between the PSFCH and the corresponding PSSCH configured in the resource pool where the first PSSCH is located.

16. The method according to any one of claims 12 to 15, characterized in that in: In the time domain position, the time slot where each PSFCH in the at least one PSFCH is located is located after the first time slot or the end position of the time slot where each PSFCH in the at least one PSFCH is located is aligned with the end position of the first time slot, and the time slot where each PSFCH in the at least one PSFCH is located is located before the second time slot; Among them, the first time slot is located at the Kth time slot after the time slot where the first PSSCH is located, K≥P, the first PSSCH is a PSSCH carrying any one of the N first data, the second time slot is located at the Lth time slot after the first time slot, the first time slot, the second time slot and the first PSSCH are located in the same resource pool of the same carrier, P is the minimum gap between the PSFCH and the corresponding PSSCH configured in the resource pool of the carrier where the first PSSCH is located, and L is the PSFCH feedback period configured in the resource pool where the first PSSCH is located.

17. The method according to claim 15 or 16, characterized in that The at least one PSFCH includes corresponding feedback information of the first data carried on the second PSSCH, wherein the second PSSCH and the first time slot are located in the same resource pool, the second PSSCH is located in the Mth time slot before the first time slot, P≤M≤P+a×L, a is a positive integer, and L is the PSFCH feedback period configured for the resource pool where the second PSSCH is located.

18. The method according to claim 17, characterized in that a is equal to 1.

19. The method according to any one of claims 12 to 18, characterized in that Each PSFCH in the at least one PSFCH includes at least N frequency domain resource sets, the N frequency domain resource sets correspond one-to-one to the N first data, and each frequency domain resource set in the N frequency domain resource sets is used to carry feedback information of the corresponding first data.

20. The method according to any one of claims 12 to 18, characterized in that The at least one PSFCH includes at least N frequency domain resource sets, the N frequency domain resource sets correspond one-to-one to the N first data, and each frequency domain resource set in the N frequency domain resource sets is used to carry feedback information of the corresponding first data.

21. The method according to claim 19 or 20, characterized in that The N frequency domain resource sets do not overlap.

22. The method according to any one of claims 12 to 21, characterized in that The method further comprises: Determine the first carrier among the T carriers, where a PSFCH time domain density of the first carrier is greater than or equal to any other carrier among the T carriers; The PSFCH time domain density is determined according to the PSFCH feedback period configured by the resource pool of the carrier and / or the subcarrier spacing corresponding to the bandwidth part of the carrier.

23. A communication device, characterized in that: Used to execute the method according to any one of claims 1 to 11, the device includes: a transceiver module and a processing module.

24. A communication device, characterized in that: Used to execute the method as described in any one of claims 12-22, the device includes: a transceiver module and a processing module.

25. A chip, characterized in that: The chip comprises a processor, the processor is coupled to a memory, the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the chip executes the method according to any one of claims 1 to 22.

26. A computer-readable storage medium, characterized in that: The storage medium stores a computer program or instruction. When the computer program or instruction is executed by a processor, the method according to any one of claims 1 to 22 is implemented.

27. A computer product, characterized in that: When it is run on a computer, the method according to any one of claims 1 to 22 is executed.

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