Bylink transmission method and device, terminal and storage medium

Abstract

The invention discloses a side link transmission method and device, a terminal and a storage medium, and belongs to the technical field of communication, and the side link transmission method comprises the steps that a first terminal determines a first receiving beam of a physical side link feedback channel PSFCH according to first information; the first terminal performs side link transmission based on the first receiving beam; wherein the first information comprises at least one of the following items: a first sending resource of a physical side link shared channel (PSSCH) or a physical side link control channel (PSCCH); a first sending beam of the PSSCH or the PSCCH; a first rule.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to a sidelink transmission method, device, terminal and storage medium. Background Art

[0002] With the rapid development of communication technology, sidelink (SL) communication has gradually developed. The Long Term Evolution (LTE) system supports sidelink transmission, that is, data is transmitted directly on the physical layer between terminals (User Equipment, UE) without going through network-side equipment. The sidelink of the LTE system is based on broadcast communication. Although it can be used to support basic safety communications of the vehicle to everything (V2X), it is not suitable for other more advanced V2X services. The 5G New Radio (NR) system supports more advanced sidelink transmission designs, such as unicast, multicast or groupcast, so that it can support a more comprehensive range of business types. Sidelinks can also be called secondary links, side links, side links, etc.

[0003] In the 5G new air interface, two frequency bands are defined, FR1 and FR2. FR1 represents the low-frequency band, and FR2 represents the millimeter-wave high-frequency band. Under the sidelink FR2, the terminal's beam is no longer omnidirectional, but directional. At the same time, the terminal is limited in its capabilities and cannot perform sidelink transmissions of all beams at the same time. This means that the terminal can only use one beam when receiving PSFCH, and must discard PSFCH reception in other beam directions. However, there is currently no good solution for how the terminal determines the receiving beam of PSFCH for sidelink transmission and ensures the efficiency of sidelink transmission. Summary of the invention

[0004] The embodiments of the present application provide a sidelink transmission method, device, terminal and storage medium, which clarify the behavior of the terminal determining the receiving beam of the PSFCH for sidelink transmission under the sidelink FR2 to ensure the efficiency of the sidelink transmission.

[0005] In a first aspect, a sidelink transmission method is provided, comprising:

[0006] The first terminal determines, according to the first information, a first receiving beam of a physical sidelink feedback channel PSFCH;

[0007] The first terminal performs sidelink transmission based on the first receive beam;

[0008] The first information includes at least one of the following:

[0009] A first transmission resource of a physical sidelink shared channel PSSCH or a physical sidelink control channel PSCCH;

[0010] A first transmit beam of a PSSCH or a PSCCH;

[0011] Rule number one.

[0012] In a second aspect, a sidelink transmission device is provided, including:

[0013] A determination module, configured to determine a first receiving beam of a physical sidelink feedback channel PSFCH according to the first information;

[0014] A transmission module, configured to perform sidelink transmission based on the first receiving beam;

[0015] The first information includes at least one of the following:

[0016] A first transmission resource of a physical sidelink shared channel PSSCH or a physical sidelink control channel PSCCH;

[0017] A first transmit beam of a PSSCH or a PSCCH;

[0018] Rule number one.

[0019] According to a third aspect, a terminal is provided, comprising a processor and a memory, wherein the memory stores a program or instruction that can be executed on the processor, and when the program or instruction is executed by the processor, the steps of the method according to the first aspect are implemented.

[0020] In a fourth aspect, a terminal is provided, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the steps of the method described in the first aspect.

[0021] In a fifth aspect, a readable storage medium is provided, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented.

[0022] In a sixth aspect, a wireless communication system is provided, comprising: a first terminal and a second terminal for side-link transmission with the first terminal, wherein the first terminal can be used to execute the steps of the method described in the first aspect.

[0023] In a seventh aspect, a chip is provided, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the steps of the method described in the first aspect.

[0024] In an eighth aspect, a computer program / program product is provided, wherein the computer program / program product is stored in a storage medium, and the program / program product is executed by at least one processor to implement the steps of the method described in the first aspect.

[0025] In an embodiment of the present application, the first terminal determines the first receiving beam of PSFCH based on the first transmitting resource of PSSCH or PSCCH, the first transmitting beam of PSSCH or PSCCH, and at least one of the first rules, and performs side-link transmission based on the first receiving beam, which clarifies the behavior of the terminal performing side-link transmission under the side-link FR2, and can effectively ensure the efficiency of the side-link transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A block diagram of a wireless communication system applicable to the embodiments of the present application;

[0027] Figure 2 A schematic diagram of an application scenario of an embodiment of the present application;

[0028] Figure 3 It is a schematic diagram of SSB transmission and reception in the related art;

[0029] Figure 4 This is a flow chart of an implementation of a sidelink transmission method in an embodiment of the present application;

[0030] Figure 5 This is a schematic diagram of a terminal using a receive beam to perform PSFCH reception in an embodiment of the present application;

[0031] Figure 6 This is a schematic diagram of the structure of a sidelink transmission device in an embodiment of the present application;

[0032] Figure 7 This is a schematic diagram of the structure of a communication device in an embodiment of the present application;

[0033] Figure 8 This is a schematic diagram of the structure of a terminal in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0035] The terms "first", "second", etc. of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of one type, and the number of objects is not limited, for example, the first object can be one or more. In addition, "or" in the present application represents at least one of the connected objects. For example, "A or B" covers three schemes, namely, Scheme 1: including A but not including B; Scheme 2: including B but not including A; Scheme 3: including both A and B. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0036] The term "indication" in this application can be a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, operations to be performed, or request results in the sent indication; an indirect indication can be understood as the receiver determining the corresponding information according to the indication sent by the sender, or making a judgment and determining the operation to be performed or the request result according to the judgment result.

[0037] It is worth noting that the technology described in the embodiments of the present application is not limited to the long-term evolution / LTE evolution (LTE-Advanced, LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the systems and radio technologies mentioned above, as well as for other systems and radio technologies. The following description describes a new air interface system for illustrative purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR systems, such as the 6th generation (6 th Generation, 6G) communication system.

[0038] Figure 1A block diagram of a wireless communication system applicable to an embodiment of the present application is shown. The wireless communication system includes a terminal 11 and a network side device 12. Among them, the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (Ultra-mobile Personal Computer, UMPC), a mobile Internet device (Mobile Internet Device, MID), an augmented reality (Augmented Reality, AR), a virtual reality (Virtual Reality, VR) device, a robot, a wearable device (Wearable Device), an aircraft (flight vehicle), a vehicle-mounted device (Vehicle User Equipment, VUE), a ship-mounted device, a pedestrian terminal (Pedestrian User Equipment, PUE), a smart home (home appliances with wireless communication functions, such as refrigerators, televisions, washing machines or furniture, etc.), a game console, a personal computer (Personal Computer, PC), a teller machine or a self-service machine and other terminal side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be referred to as a radio access network (Radio Access Network, RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (Wireless Local Area Network, WLAN) access point (Access Point, AS) or a wireless fidelity (Wireless Fidelity, WiFi) node, etc.Among them, the base station may be referred to as a Node B (NB), an evolved Node B (eNB), a next generation Node B (gNB), a New Radio Node B (NR Node B), an access point, a Relay Base Station (RBS), a Serving Base Station (SBS), a Base Transceiver Station (BTS), a radio base station, a radio transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a Home Node B (HNB), a Home Evolved Node B, a Transmission Reception Point (TRP) or other appropriate terms in the field. As long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiments of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0039] To facilitate understanding, the application scenarios of the embodiments of the present application, as well as the related technologies and concepts involved, are first introduced.

[0040] 1. Application scenarios

[0041] The technical solution provided in the embodiment of the present application can be applied to sidelink transmission scenarios, such as sidelink positioning and the like. Figure 2 As shown, terminal 1 can perform side link transmission with terminal 2, terminal 3, and terminal 4 through a side link, such as sending / receiving / measuring a side link channel or signal. At the same time, terminal 1 can communicate with the network side device through an uplink (Uplink) and a downlink (Downlink).

[0042] As described above, the LTE system supports sidelink transmission, that is, data is transmitted directly between terminals at the physical layer without going through network-side devices. The LTE system sidelink is based on broadcast communication. Although it can be used to support basic safety communications in the Internet of Vehicles, it is not suitable for other more advanced V2X services. The 5G new air interface system supports more advanced sidelink transmission designs, such as unicast, multicast or groupcast, so as to support a more comprehensive range of service types.

[0043] II. Allocation / selection of new air interface sidelink resources

[0044] The new air interface side link may include the following channels:

[0045] Physical Sidelink Control Channel (PSCCH);

[0046] Physical Sidelink Shared Channel (PSSCH);

[0047] Physical Sidelink Broadcast Channel (PSBCH);

[0048] Physical Sidelink Feedback Channel (PSFCH).

[0049] There are two new air interface side link resource allocation modes, one is a resource allocation mode based on base station scheduling, namely mode 1, and the other is a resource allocation mode based on terminal autonomous selection, namely mode 2.

[0050] For mode 1, the sidelink resources used by the terminal for data transmission are determined by the base station, and the base station notifies the sending terminal (TX UE) through downlink signaling; for mode 2, the terminal selects available transmission resources from the (pre-)configured resource pool. Before selecting resources, the terminal first performs channel sensing, selects a resource set with less interference based on the channel sensing results, and then randomly selects resources for transmission from the selected resource set.

[0051] For mode 2, the specific working method is as follows:

[0052] 1) After the resource selection is triggered, the sending terminal first determines the resource selection window. The lower boundary of the resource selection window is T1 time after the resource selection is triggered, and the upper boundary of the resource selection window is T2 time after the resource selection is triggered. T2 is the value selected by the terminal implementation within the packet delay budget (PDB) transmitted in its transport block (TB), and T2 is no earlier than T1;

[0053] 2) Before selecting resources, the terminal needs to determine the candidate resource set (candidate resourceset) for resource selection, and compare the reference signal received power (RSRP) measured on the resources in the resource selection window with the corresponding RSRP threshold. If the RSRP of a resource is higher than the RSRP threshold, the resource will be excluded and not included in the candidate resource set. The remaining resources in the resource selection window after resource exclusion constitute the candidate resource set. The proportion of resources in the candidate resource set to the resources in the resource selection window must be no less than x%. If it is less than x%, the RSRP threshold needs to be increased by a step value, such as 3dB, and then the above-mentioned resource exclusion operation is performed until no less than x% of resources can be selected;

[0054] 3) After the candidate resource set is determined, the terminal randomly selects a transmission resource from the candidate resource set.

[0055] In addition, the terminal may reserve transmission resources for subsequent transmissions during this transmission.

[0056] 3. About Beam

[0057] Due to the scarcity of low-frequency resources, 5G new air interface uses high-frequency bands such as millimeter waves. Since the propagation loss of high-frequency bands is greater than that of low-frequency bands, its coverage distance is worse than that of LTE. One solution is that 5G new air interface uses multi-antenna beamforming (Beam Forming) to achieve signal enhancement and thus enhance coverage. Beamforming technology is a signal processing technology that uses a sensor array to send and receive signals in a direction. Beamforming technology adjusts the parameters of the basic unit of the phase array so that signals at certain angles obtain constructive interference, while signals at other angles obtain destructive interference, so that the antenna beam points to a specific direction. The establishment of the downlink beam is generally determined by the synchronization signal block (Synchronization Signal Block, SSB) and the channel state information reference signal (Channel State Information-Reference Signal, CSI-RS).

[0058] Take SSB as an example: Since the beam is narrow, the same SSB is sent to different directions in the form of beams in the new air interface according to the time division duplexing (TDD) method, so that terminals in all directions can receive the SSB. Figure 3As shown, within the range of 5ms, the base station sends multiple SSBs corresponding to different SSB indexes (Index), covering different directions respectively. UE1 and UE2 receive multiple SSBs with different signal strengths and select the strongest one as their own SSB beam.

[0059] IV. About Transmission Configuration Indication (TCI)

[0060] At the Uu port, TCI can be indicated by downlink control information (DCI), and TCI will be associated with a reference signal. The physical downlink shared channel (PDSCH) / physical uplink shared channel (PUSCH) scheduled by DCI and the reference signal corresponding to TCI are quasi-colocation (QCL). In other words, the beam of the reference signal is the same as the beam of the PDSCH, so through TCI, the terminal can know which beam to use to receive data. The TCI used to control the beam of PDSCH is called the downlink TCI (DL TCI), and the TCI used to control the beam of PUSCH is called the uplink TCI (UL TCI), and PUSCH / PDSCH is also allowed to share the same set of TCI, which can be simply called TCI.

[0061] The base station can enable the terminal to switch to different beams by modifying TCI, but this process may involve DCI decoding and beam switching. Therefore, the switching beam will not take effect immediately after sending / receiving TCI. Instead, it requires a certain amount of processing time, and the terminal cannot send / receive during the processing time.

[0062] V. Restrictions on terminal sending and receiving

[0063] In the related art, when a terminal needs to send or receive M physical sidelink feedback channels (PSFCH), but the terminal can only send or receive N (N < M) channels, the sending or receiving order can be determined according to the priority, that is, the PSFCH with the highest priority is sent or received first. M and N are positive integers.

[0064] 6. About terminal capabilities

[0065] In the relevant 3GPP meeting, it was mentioned that priority is given to the terminal not being able to use multiple beams to send or receive at the same time. It is believed that the terminal can only use one beam to perform detection or transmission at the same time, and cannot use multiple beams to perform detection or transmission at the same time.

[0066] The application scenarios, related technologies and concepts of the embodiments of the present application are introduced above. The sidelink transmission method provided by the embodiments of the present application is described in detail below through some embodiments and their application scenarios in conjunction with the accompanying drawings.

[0067] See also Figure 4 As shown, it is a flowchart of an implementation of a sidelink transmission method provided in an embodiment of the present application, and the method includes the following steps:

[0068] S410: The first terminal determines a first receiving beam of a physical sidelink feedback channel PSFCH according to the first information;

[0069] The first information includes at least one of the following:

[0070] A first transmission resource of a physical sidelink shared channel PSSCH or PSCCH;

[0071] A first transmit beam of a PSSCH or a PSCCH;

[0072] First rule;

[0073] S420: The first terminal performs sidelink transmission based on the first receiving beam.

[0074] By applying the method provided in the embodiment of the present application, the first terminal determines the first receiving beam of PSFCH according to the first transmitting resource of PSSCH or PSCCH, the first transmitting beam of PSSCH or PSCCH, and at least one of the first rules, and performs side link transmission based on the first receiving beam. This clarifies the behavior of the terminal determining the receiving beam of PSFCH for side link transmission under the side link FR2, which can effectively ensure the efficiency of side link transmission.

[0075] The first terminal may be Figure 1 The terminal 11 shown may also be Figure 2 Any one of the terminal 1, terminal 2, terminal 3, and terminal 4 shown.

[0076] In some embodiments of the present application, when the first information includes a first transmission resource or a first transmission beam, the first terminal determines a first receiving beam of a physical sidelink feedback channel PSFCH according to the first information, which may include the following steps:

[0077] Step 1: The first terminal selects a first transmission resource or a first transmission beam of a PSSCH or a PSCCH;

[0078] Step 2: The first terminal determines the receiving beam corresponding to the first transmitting resource or the receiving beam corresponding to the first transmitting beam as the first receiving beam of the PSFCH.

[0079] For the convenience of description, the above two steps are combined for explanation.

[0080] In an embodiment of the present application, the correspondence between the transmission resources of PSSCH or PSCCH and the receiving beam of PSFCH, or the correspondence between the transmission beam of PSSCH or PSCCH and the receiving beam of PSFCH can be predetermined (configured or set). For example, based on beam reciprocity, the receiving beam of PSFCH can be inferred based on the transmission beam of PSSCH or PSCCH, or the receiving beam of PSFCH can be inferred based on beam training according to the opposite data transmission, or the correspondence can be at least one of the same beam, quasi-co-address, same beam index, same beam identifier, same transmission configuration indication, covering, and covered.

[0081] The first terminal may first select a first transmission resource of the PSSCH or PSCCH, and then determine the reception beam corresponding to the first transmission resource as the first reception beam of the PSFCH according to the correspondence between the transmission resource of the PSSCH or PSCCH and the reception beam of the PSFCH;

[0082] Alternatively, the first terminal may first select the first transmit beam of PSSCH or PSCCH, and then determine the receive beam corresponding to the first transmit beam as the first receive beam of PSFCH based on the correspondence between the transmit beam of PSSCH or PSCCH and the receive beam of PSFCH.

[0083] The first terminal may perform sidelink transmission based on the first transmission resource, the first transmission beam, or the first reception beam.

[0084] The first terminal first selects the first transmission resource or the first transmission beam of PSSCH or PSCCH, and then determines the receiving beam corresponding to the selected first transmission resource or first transmission beam as the first receiving beam of PSFCH, which clarifies the behavior of the terminal performing side link transmission under FR2 and helps to ensure the efficiency of side link transmission.

[0085] The first terminal selects the first transmission resource or the first transmission beam of PSSCH or PSCCH so that the corresponding PSFCH receiving beam can receive PSFCHs that meet certain rules, such as receiving the largest number or the highest priority or the largest number of PSFCHs corresponding to the top P priorities.

[0086] In some embodiments of the present application, the first terminal selects a first transmission resource or a first transmission beam of a PSSCH or a PSCCH, which may include at least one of the following:

[0087] The first terminal selects a first transmission resource or a first transmission beam of a PSSCH or a PSCCH in conjunction with different processes or different receiving terminals or different carriers;

[0088] The first terminal selects the first transmission resource or the first transmission beam of the PSSCH or PSCCH based on the second rule.

[0089] In an embodiment of the present application, the first terminal may correspond to different processes or different receiving terminals or different carriers. When the first terminal selects the transmission resources or transmission beams of PSSCH or PSCCH, the selection may be made in conjunction with different processes or different receiving terminals or different carriers. For example, the first terminal selects the first transmission resource or the first transmission beam of PSSCH or PSCCH, so that the corresponding receiving beam of PSFCH may correspond to different processes or different receiving terminals or different carriers, that is, the receiving beam of PSFCH corresponding to different processes or different receiving terminals or different carriers is the same. For another example, the first terminal selects the first transmission resource or the first transmission beam of PSSCH or PSCCH, so that the corresponding receiving beam of PSFCH may correspond to the maximum number of different processes or different receiving terminals or different carriers.

[0090] Alternatively, a second rule may be predetermined (set or configured), and the first terminal may select the first transmission resource or the first transmission beam of the PSSCH or PSCCH based on the second rule. Alternatively, the first terminal may select the first transmission resource or the first transmission beam of the PSSCH or PSCCH based on the second rule in conjunction with different processes or different receiving terminals or different carriers.

[0091] The second rule may include at least one of the following:

[0092] 1) The corresponding PSFCH receiving beam may correspond to different processes or different receiving terminals or different carriers. According to this rule, the first terminal may select the first transmission resource or the first transmission beam of the PSSCH or PSCCH so that the corresponding PSFCH receiving beam may correspond to different processes or different receiving terminals or different carriers. It can be understood that this can avoid the problem that the first terminal independently selects transmission resources or transmission beams for different processes or the first terminal is in the process of communicating with different receiving terminals or the first terminal is a different carrier, causing many PSFCHs to be unable to be received due to different PSFCH receiving beams;

[0093] 2) The corresponding PSFCH receiving beam can correspond to the largest number of different processes or different receiving terminals or different carriers. According to this rule, the first terminal can select the first transmission resource or the first transmission beam of PSSCH or PSCCH so that the corresponding PSFCH receiving beam can correspond to the largest number of different processes or different receiving terminals or different carriers. It can be understood that the PSFCH receiving beam finally selected by the terminal is not determined according to the priority, but the receiving beam of PSFCH that can receive the largest number of processes, receiving terminals or carriers associated with PSFCH is selected, thereby improving the system transmission efficiency;

[0094] 3) The transmission resources selected for different processes or different receiving terminals or different carriers correspond to different PSFCH occasions. According to this rule, the transmission resources selected by the first terminal for different processes or different receiving terminals or different carriers will correspond to different PSFCH occasions. In other words, if the first terminal determines different first transmission beams for different processes or different receiving terminals or different carriers, when selecting the first transmission resource, it is necessary to avoid the PFSCH of the selected first transmission resource corresponding to the same PSFCH occasion. It can be understood that when the PSFCH occasions are different, it is possible to avoid the situation where one of the receiving beams of multiple PSFCHs is selected.

[0095] 4) The transmission resources of PSSCH or PSCCH in the same time unit or in the same time window correspond to the same receiving terminal. When the first terminal selects the transmission resources of PSSCH or PSCCH in a certain time unit or in a certain time window according to this rule, the selected transmission resources and the transmission resources of other PSSCH or PSCCH selected in the time unit or in the time window correspond to the same receiving terminal. It can be understood that if the transmission resources of PSSCH or PSCCH associated with a PSFCH opportunity are all used to communicate with the same receiving terminal, there is only one receiving beam of PSFCH, and there is no need to discard the reception of certain PSFCHs;

[0096] 5) The transmission resources of PSSCH or PSCCH in the same time unit or in the same time window correspond to the same transmission beam. When the first terminal selects the transmission resources of PSSCH or PSCCH in a certain time unit or a certain time window according to this rule, the selected transmission resources correspond to the same transmission beam as the transmission resources of other PSSCH or PSCCH selected in the time unit or the time window. It can be understood that if the transmission resources of PSSCH or PSCCH associated with a PSFCH opportunity all use the same transmission beam, then there is only one receiving beam for PSFCH, and there is no need to discard the reception of certain PSFCHs;

[0097] 6) The transmission resources of PSSCH or PSCCH located on different carriers in the same time unit or in the same time window correspond to the same transmission beam. When the first terminal selects the transmission resources of PSSCH or PSCCH located on a certain carrier in a certain time unit or in a certain time window according to this rule, the transmission beam corresponding to the transmission resources is the same as the transmission beam corresponding to the transmission resources of PSSCH or PSCCH selected on other carriers in the same time unit or in the time window. It can be understood that if the transmission beams of the transmission resources of PSSCH or PSCCH on different carriers associated with a time unit or a PSFCH opportunity are the same, then the receiving beams of PSFCH are also the same;

[0098] 7) The transmission resources or transmission beams of PSSCH or PSCCH located on different carriers in the same time unit or the same time window correspond to the receiving beam of the same PSFCH. When the first terminal selects the transmission resources or transmission beams of PSSCH or PSCCH located on a certain carrier in a certain time unit or a certain time window according to the rule, the transmission resources or transmission beams are the same as the receiving beams of PSFCH corresponding to the transmission resources or transmission beams of PSSCH or PSCCH selected on other carriers in the time unit or the time window;

[0099] The time window refers to the time range corresponding to the PSFCH opportunity.

[0100] When the first terminal selects the first transmission resource or the first transmission beam of PSSCH or PSCCH, it makes a selection based on at least one of the above-mentioned second rules, which clarifies the selection behavior of the first terminal for transmission resources or transmission beams, and facilitates the subsequent smooth determination of the receiving beam of PSFCH based on the transmission resources or transmission beams.

[0101] In addition, when selecting the first transmission resource or the first transmission beam of the PSSCH or PSCCH, the first terminal does not consider the transmission resource selection or transmission beam selection of the PSSCH or PSCCH that enables blind retransmission.

[0102] In some embodiments of the present application, the first terminal selects a first transmission resource or a first transmission beam of a PSSCH or a PSCCH, which may include the following steps:

[0103] The first terminal selects the first transmission resource or the first transmission beam of the PSSCH or PSCCH according to the beam measurement result.

[0104] It can be understood that the optimal beam determined by the terminal within a period of time is unique, and selecting transmission resources in the corresponding candidate resource set within the time period can make the corresponding PSFCH receiving beam as similar as possible, at least for the same receiving terminal.

[0105] In the embodiment of the present application, the first terminal may obtain a beam measurement result. Optionally, the first terminal may perform beam measurement on the beam transmitted by the other end to obtain the beam measurement result, and then correspond the beam measurement result to the beam transmitted by itself.

[0106] The first terminal can select the first transmission resource or the first transmission beam of the PSSCH or PSCCH according to the beam measurement result, which clarifies the behavior of the terminal in selecting the transmission resource or the transmission beam.

[0107] In some embodiments of the present application, the first terminal selects the first transmission resource or the first transmission beam of the PSSCH or PSCCH according to the beam measurement result, which may include at least one of the following:

[0108] The first terminal selects the transmission beam corresponding to the optimal beam measurement result as the first transmission beam of the PSSCH or PSCCH;

[0109] The first terminal selects a first transmission resource of a PSSCH or a PSCCH from a candidate resource set corresponding to a transmission beam corresponding to an optimal beam measurement result;

[0110] The first terminal selects a first transmission resource of PSSCH or PSCCH from candidate resource sets corresponding to different transmission beams based on different weights according to the beam measurement result.

[0111] It can be understood that the better the beam measurement result, the better the corresponding transmit beam communication quality.

[0112] In an embodiment of the present application, the first terminal selects the transmitting beam corresponding to the optimal beam measurement result as the first transmitting beam of PSSCH or PSCCH, which can effectively ensure the communication quality of the selected first transmitting beam and make it easier to determine the receiving beam of PSFCH that is beneficial to the system transmission efficiency.

[0113] Alternatively, the first terminal selects the first transmission resource of PSSCH or PSCCH from the candidate resource set corresponding to the transmission beam corresponding to the optimal beam measurement result. This can effectively ensure the communication quality of the selected first transmission resource and make it easier to determine the receiving beam of PSFCH that is beneficial to the system transmission efficiency.

[0114] Alternatively, when selecting the first transmission resource of the PSSCH or PSCCH, the first terminal selects the first transmission resource of the PSSCH or PSCCH from the candidate resource sets corresponding to the different transmission beams based on the different weights corresponding to the different beam measurement results, such as the better the beam measurement result, the greater the corresponding weight. It can be understood that different weights affect the terminal (MAC layer) to select transmission resources or transmission beams from the candidate resource sets corresponding to which transmission beams with different probabilities.

[0115] Optionally, the transmission beam corresponding to the optimal beam measurement result may include at least one of the following:

[0116] 1) The transmit beam corresponding to the best result of the channel state information (CSI);

[0117] 2) A transmitting beam corresponding to beam measurement results of different receiving terminals that are at least partially greater than or equal to a first threshold, that is, a transmitting beam corresponding to beam measurement results of different receiving terminals that are relatively good. The first threshold can be preset or configured.

[0118] Optionally, the reference signal received power RSRP threshold corresponding to the candidate resource sets corresponding to different transmit beams is determined according to at least one of the following:

[0119] Beam measurement results;

[0120] Multiple RSRP threshold lists configured;

[0121] A configured RSRP threshold list and multiple RSRP threshold offset values.

[0122] Different transmission beams correspond to their own candidate resource sets. The candidate resources in the candidate resource set are determined based on the RSRP threshold. The candidate resource sets corresponding to different transmission beams have their own corresponding RSRP thresholds. There are multiple ways to determine the RSRP threshold.

[0123] The first method is: determining the RSRP threshold corresponding to the candidate resource sets corresponding to different transmission beams according to the beam measurement results;

[0124] The second method is: determining the RSRP threshold corresponding to the candidate resource sets corresponding to different transmission beams according to the configured multiple RSRP threshold lists (RSRP threshold list). Multiple RSRP threshold lists can be pre-configured, and each RSRP threshold list may include multiple RSRP thresholds corresponding to different priorities. The first terminal can determine the RSRP threshold list corresponding to each transmission beam according to the beam measurement result corresponding to the transmission beam, and then select an RSRP threshold in the RSRP threshold list corresponding to each transmission beam as the RSRP threshold corresponding to the candidate resource set corresponding to the corresponding transmission beam. Specifically, the current communication beam or the last communication beam may correspond to the lowest RSRP threshold list. Alternatively, the current communication beam or the last communication beam corresponds to the highest RSRP threshold list;

[0125] The third method is to determine the RSRP threshold corresponding to the candidate resource set corresponding to different transmission beams according to a configured RSRP threshold list and multiple RSRP threshold offset values. That is, a RSRP threshold list and multiple RSRP threshold offset values ​​are pre-configured. The RSRP threshold list may include one or more RSRP thresholds, from which an RSRP threshold is selected as the reference threshold. The PSRP threshold offset value corresponding to the candidate resource set corresponding to each transmission beam can be determined according to the beam measurement result, and then the corresponding RSRP threshold is determined according to the reference threshold and the corresponding RSRP threshold offset value. Specifically, the RSRP threshold list corresponding to the current communication beam or the last communication beam is configured.

[0126] It can be understood that the better the beam measurement result, the higher the RSRP threshold corresponding to the corresponding candidate resource set, and the less likely the resources will be excluded. In this way, the probability that the transmitting resources selected by the first terminal for different processes or different receiving terminals or different carriers correspond to the same transmitting beam is higher, making the probability of receiving PSFCH using the same receiving beam higher.

[0127] The above methods can be used alone or in combination to determine the RSRP thresholds corresponding to candidate resource sets corresponding to different transmit beams, thereby increasing the probability of receiving PSFCH using the same beam.

[0128] In some embodiments of the present application, the first receiving beam may include at least one of the following:

[0129] A receiving beam at a PSFCH opportunity corresponding to a time slot where a first transmitting resource or a first transmitting beam is located;

[0130] The receive beam corresponding to the Nth determined transmit resource or transmit beam in the time slot corresponding to the PSFCH opportunity, where N is a positive integer;

[0131] The receiving beam corresponding to the highest priority transmission resource or transmission beam in the time slot corresponding to the PSFCH opportunity.

[0132] In an embodiment of the present application, the first terminal determines the first receiving beam of the PSFCH based on at least one of the first transmitting resource of the PSSCH or PSCCH, the first transmitting beam of the PSSCH or PSCCH, and the first rule.

[0133] The first receiving beam may be a receiving beam on a PSFCH opportunity corresponding to the first transmitting resource or the time slot where the first transmitting beam is located. For example, after the first terminal determines the first transmitting beam on a certain time slot, the receiving beam on the PSFCH opportunity corresponding to this time slot is the first receiving beam of the PSFCH corresponding to the first transmitting beam determined in this time slot.

[0134] The first receiving beam may also be the receiving beam corresponding to the Nth determined transmission resource or transmission beam in the time slot corresponding to the PSFCH opportunity, where N is a positive integer. For example, the receiving beam corresponding to the transmission resource or transmission beam that is first determined or last determined by the first terminal in the time slot corresponding to the PSFCH opportunity is the first receiving beam of the PSFCH at this PSFCH opportunity. It can be understood that if the first receiving beam is determined based on the first determined transmission resource or transmission beam, the subsequent transmission resources or transmission beams selected within the time slot corresponding to this opportunity need to take into account the already determined PSFCH receiving beam, so as to maximize the transmission efficiency of the PSFCH receiving beam as much as possible.

[0135] The first receiving beam may also be the receiving beam corresponding to the highest priority transmission resource or transmission beam in the time slot corresponding to the PSFCH opportunity. For example, the receiving beam corresponding to the highest priority transmission resource or transmission beam determined by the first terminal in the time slot corresponding to the PSFCH opportunity is the first receiving beam of PSFCH. It can be understood that the receiving beam of PSFCH is determined based on the highest priority transmission resource or transmission beam, which complies with the principle that the current PSFCH preferentially receives the PSFCH with a higher priority. At this time, if the subsequent transmission resource or transmission beam has a higher priority due to the time sequence, it may trigger resource reselection or beam reselection of other determined transmission resources.

[0136] In some embodiments of the present application, after the first terminal determines the first receiving beam of the physical sidelink feedback channel PSFCH according to the first information, the method may further include the following steps:

[0137] The first terminal selects a second transmission resource or a second transmission beam of the PSSCH or PSCCH according to the first receiving beam.

[0138] In an embodiment of the present application, after the first terminal determines the first receiving beam of PSFCH based on the first information, it can select the second transmitting resource or the second transmitting beam of PSSCH or PSCCH based on the first receiving beam, so that the transmitting resource or transmitting beam within the time domain range corresponding to the PSFCH opportunity corresponds to the determined receiving beam of PSFCH, thereby maximizing the transmission efficiency of PSFCH.

[0139] Optionally, the first terminal may select the transmission resource corresponding to the first receiving beam as the second transmission resource of PSSCH or PSCCH.

[0140] Optionally, the first terminal may select the transmission beam corresponding to the first reception beam as the second transmission beam of the PSSCH or PSCCH.

[0141] The first terminal selects the second transmission resource or the second transmission beam of PSSCH or PSCCH according to the first receiving beam, and can perform side link transmission based on the first receiving beam, the second transmission resource or the second transmitting beam, thereby clarifying the side link transmission behavior of the terminal.

[0142] In some embodiments of the present application, the transmission beam corresponding to the retransmission resource of PSSCH or PSCCH and the transmission beam corresponding to the initial transmission resource are in a quasi-colocation (QCL) relationship. That is, after the first terminal determines the first receiving beam of PSFCH, the subsequent retransmission resources corresponding to the same PSSCH or PSCCH are sent using the QCL transmission beam, so that the corresponding PSFCH receiving beam remains unchanged.

[0143] In some embodiments of the present application, the method may further include the following steps:

[0144] The first terminal reselects a receiving beam of the PSFCH, or reselects a transmitting resource or a transmitting beam of the PSSCH or PSCCH selected in the first time window;

[0145] The first time window is a time domain range corresponding to the PSFCH opportunity.

[0146] In an embodiment of the present application, after the first terminal determines the first receiving beam of PSFCH, it may need to replace the new receiving beam of PSFCH for some reason, and then the receiving beam of PSFCH may be reselected. After reselecting the receiving beam of PSFCH, the transmission resources or transmission beam of PSSCH or PSCCH selected in the first time window may correspond to the receiving beam of PSFCH after reselection, or may not correspond to the receiving beam of PSFCH after reselection. The transmission resources or transmission beam of PSSCH or PSCCH selected in the first time window can be reselected. Optionally, for the transmission resources or transmission beam of PSSCH or PSCCH selected in the first time window, the transmission resources or transmission beam of PSSCH or PSCCH that do not correspond to the receiving beam of PSFCH after reselection are reselected, so that the transmission resources or transmission beam of PSSCH or PSCCH in the first time window correspond to the receiving beam of PSFCH after reselection.

[0147] The first terminal determines a first receive beam of the PSFCH according to a first rule. In some embodiments of the present application, the first rule may include at least one of the following:

[0148] 1) The PSFCH with the highest priority can be received. According to the rule, the first terminal can determine the receiving beam that can receive the PSFCH with the highest priority on at least one carrier or resource pool as the first receiving beam. It can be understood that the first terminal preferentially receives the PSFCH with the highest priority among multiple PSFCHs;

[0149] 2) The maximum number of PSFCHs can be received. According to the rule, the first terminal can determine the receiving beam that can receive the maximum number of PSFCHs on at least one carrier or resource pool as the first receiving beam. It can be understood that the first terminal selects the beam that can receive the most PSFCHs as the receiving beam, thereby discarding the least PSFCHs to maximize the PSFCH transmission efficiency;

[0150] 3) The P1 highest priorities that can be received correspond to the largest number of PSFCHs, where P1 is a positive integer. According to this rule, the first terminal can determine the receiving beam that can receive the largest number of PSFCHs corresponding to the top P1 priorities on at least one carrier or resource pool as the first receiving beam. For example, the receiving beam that can receive the largest number of PSFCHs corresponding to the top three priorities is determined as the first receiving beam. It can be understood that since the level of PSFCH priority corresponds to the priority of the data, and thus to the relative importance, if only the number is considered without considering the priority, many high-priority PSFCHs may be discarded, thereby affecting system reliability. Therefore, the receiving beam with the largest number of PSFCHs in the top P1 priorities can be selected, thereby considering the impact of both priority and quantity;

[0151] 4) When the number of PSFCHs with a higher priority that can be received is the same, the maximum number of PSFCHs with a lower priority can be received. According to this rule, if the number of PSFCHs with a higher priority that can be received by the receiving beams of multiple PSFCHs is the same, the first terminal compares the number of PSFCHs with a lower priority that can be received, and determines the receiving beam that can receive the maximum number of PSFCHs with a lower priority as the first receiving beam. For example, if the number of PSFCHs with the highest priority that can be received by the receiving beams of multiple PSFCHs is the same, the number of PSFCHs with the second highest priority that can be received is compared. If they are still the same, the number of PSFCHs with a lower priority that can be received continues to be compared.

[0152] 5) Associated with the carrier or resource pool that can receive the highest priority PSFCH;

[0153] 6) Associated with the carrier or resource pool that can receive the largest number of PSFCHs;

[0154] 7) Associated with the carrier or resource pool corresponding to the largest number of PSFCHs at the first P2 priorities that can receive the highest priority, where P2 is a positive integer;

[0155] 8) being associated with a carrier or resource pool that can receive the largest number of PSFCHs of a lower priority level when the number of PSFCHs of a higher priority level is the same;

[0156] For 5)-8), in a multiple carrier or multiple resource pool scenario, if the receiving beams corresponding to each carrier or resource pool are different, the receiving beam associated with one of the carriers or resource pools can be selected according to the corresponding rule (for example, the first rule). If at least some of the carriers or some of the resource pools correspond to the same receiving beam, it can be considered to select a receiving beam with more associated carriers or resource pools or determine the receiving beam according to other possible rules;

[0157] 9) The number of retransmissions of the corresponding PSFCH is greater than or equal to the second threshold. According to the rule, the first terminal selects a receiving beam whose number of retransmissions of the corresponding PSFCH is greater than or equal to the second threshold from multiple receiving beams on at least one carrier or resource pool as the first receiving beam, so as to receive the PSFCH with a large number of retransmissions as soon as possible, and prevent such PSFCH from being discarded due to reaching the maximum number of retransmissions. The second threshold can be preset or configured;

[0158] 10) The number of retransmissions of the corresponding PSFCH is less than or equal to the third threshold. According to the rule, the first terminal selects a receiving beam whose number of retransmissions of the corresponding PSFCH is less than or equal to the third threshold from multiple receiving beams on at least one carrier or resource pool as the first receiving beam. The third threshold can be preset or configured;

[0159] 11) The number of retransmissions of the corresponding PSFCH is greater than or equal to the fourth threshold, and the number of retransmissions of the non-corresponding PSFCH is less than or equal to the fifth threshold. The first terminal determines, for each of the multiple receiving beams, the number of retransmissions of the PSFCH corresponding to the receiving beam. If the number of retransmissions of the PSFCH corresponding to the receiving beam is greater than or equal to the fourth threshold, and the number of retransmissions of the PSFCH corresponding to other receiving beams is less than or equal to the fifth threshold, the receiving beam is determined as the first receiving beam. The fourth threshold and the fifth threshold can be pre-set or configured, and the fifth threshold is less than the fourth threshold. It can be understood that if some PSFCHs are about to be discarded, and other PSFCHs still have multiple retransmission opportunities, the PSFCHs that are about to be discarded will be given priority;

[0160] 12) The remaining number of retransmissions of the corresponding PSFCH is less than or equal to the sixth threshold. According to the rule, the first terminal selects a receiving beam whose remaining number of retransmissions of the corresponding PSFCH is less than or equal to the sixth threshold from multiple receiving beams on at least one carrier or resource pool as the first receiving beam, so as to receive the PSFCH with a smaller number of remaining retransmissions as soon as possible. The sixth threshold can be preset or configured;

[0161] 13) The remaining number of retransmissions of the corresponding PSFCH is greater than or equal to the seventh threshold. According to the rule, the first terminal selects a receiving beam whose remaining number of retransmissions of the corresponding PSFCH is greater than or equal to the seventh threshold from multiple receiving beams on at least one carrier or resource pool as the first receiving beam. The seventh threshold can be preset or configured;

[0162] 14) The remaining number of retransmissions of the corresponding PSFCH is less than or equal to the eighth threshold, and the remaining number of retransmissions of the non-corresponding PSFCH is greater than or equal to the ninth threshold. The first terminal determines the remaining number of retransmissions of the PSFCH corresponding to each receiving beam in multiple receiving beams on at least one carrier or resource pool. If the remaining number of retransmissions of the PSFCH corresponding to the receiving beam is less than or equal to the eighth threshold, and the remaining number of retransmissions of the PSFCH corresponding to other receiving beams is greater than or equal to the ninth threshold, the receiving beam is determined as the first receiving beam. The eighth threshold and the ninth threshold can be pre-set or configured, and the eighth threshold is less than the ninth threshold;

[0163] 15) PSFCH corresponding to the last transmission opportunity. According to the rule, the first terminal may determine the receiving beam corresponding to the PSFCH of the last transmission opportunity on at least one carrier or resource pool as the first receiving beam;

[0164] 16) Corresponding to the PSFCH of the non-last transmission opportunity. According to the rule, the first terminal may determine the receiving beam of the PSFCH of the non-last transmission opportunity on at least one carrier or resource pool as the first receiving beam;

[0165] 17) The remaining transmission opportunity of the corresponding PSFCH is less than or equal to the tenth threshold. According to the rule, the first terminal selects a receiving beam whose remaining transmission opportunity of the corresponding PSFCH is less than or equal to the tenth threshold from multiple receiving beams on at least one carrier or resource pool as the first receiving beam, so as to receive the PSFCH with a smaller remaining transmission opportunity as soon as possible. The tenth threshold can be preset or configured;

[0166] 18) The remaining transmission opportunity of the corresponding PSFCH is greater than or equal to the eleventh threshold. According to the rule, the first terminal selects a receiving beam whose remaining transmission opportunity of the corresponding PSFCH is greater than or equal to the eleventh threshold from multiple receiving beams on at least one carrier or resource pool as the first receiving beam. The eleventh threshold can be preset or configured;

[0167] 19) The remaining transmission opportunities of the corresponding PSFCH are less than or equal to the twelfth threshold, and the remaining transmission opportunities of the non-corresponding PSFCH are greater than or equal to the thirteenth threshold. The first terminal determines the remaining transmission opportunities of the PSFCH corresponding to each receiving beam in multiple receiving beams on at least one carrier or resource pool. If the remaining transmission opportunities of the PSFCH corresponding to the receiving beam are less than or equal to the twelfth limit, and the remaining transmission opportunities of the PSFCH corresponding to other receiving beams are greater than or equal to the thirteenth threshold, the receiving beam is determined as the first receiving beam. The twelfth threshold and the thirteenth threshold can be preset or configured, and the twelfth threshold is less than the thirteenth threshold;

[0168] The transmission opportunity mentioned above refers to multiple PSFCH opportunities associated with the corresponding PSFCH;

[0169] 20) The first weight determined based on the priority of PSFCH is the highest or lowest. PSFCHs of different priorities have different weights, and the first weight can be determined based on the priority of PSFCH. For example, the weight of one PSFCH with the highest priority is a1, and the weight of one PSFCH with the second highest priority is a2. A certain receiving beam can receive one PSFCH with the highest priority and two PSFCHs with the second highest priority. Then its corresponding first weight = 1*a1+2*a2. The first terminal determines the first weight corresponding to each of the multiple receiving beams, and determines the receiving beam with the highest or lowest first weight as the first receiving beam. In a multi-carrier or multi-resource pool scenario, the first terminal can determine the first weight corresponding to each carrier or each resource pool, and determine the receiving beam associated with the carrier or resource pool with the highest or lowest first weight as the first receiving beam;

[0170] 21) The number of associated carriers or resource pools is the largest. According to the rule, the first terminal determines the receiving beam with the largest number of associated carriers or resource pools as the first receiving beam;

[0171] 22) The beam measurement result is optimal. According to the rule, the first terminal may determine the receiving beam with the optimal beam measurement result on at least one carrier or resource pool as the first receiving beam;

[0172] 23) The beam measurement result is greater than or equal to the fourteenth threshold. According to the rule, the first terminal may determine the receiving beam whose beam measurement result on at least one carrier or resource pool is greater than or equal to the fourteenth threshold as the first receiving beam. The fourteenth threshold may be preset or configured;

[0173] 24) The second weight determined based on the beam measurement result is the highest or lowest. Different beam measurement results correspond to different weights, and the second weight can be determined based on the beam measurement result. For example, the weight corresponding to the optimal beam measurement result is b1, and the weight is multiplied by the number of PSFCHs on the receiving beam corresponding to the optimal beam measurement result, the number of PSFCHs with the highest priority, the number of receivable PSFCHs corresponding to the top P priorities, and at least one of the first weights to obtain the second weight of the receiving beam. The first terminal determines the second weight corresponding to each of the multiple receiving beams, and determines the receiving beam with the highest or lowest second weight as the first receiving beam. In a multi-carrier or multi-resource pool scenario, the first terminal can determine the second weight corresponding to each carrier or each resource pool, and determine the receiving beam associated with the carrier or resource pool with the highest or lowest second weight as the first receiving beam;

[0174] 25) The third weight determined based on the carrier or resource pool is the highest or lowest. Different carriers or resource pools have different corresponding weights, and the third weight can be determined based on the carrier or resource pool. For example, the weight corresponding to carrier 1 is c1, and the weight is multiplied by the number of PSFCHs on the carrier, the number of PSFCHs with the highest priority, the number of PSFCHs with the highest priority corresponding to the first P, and at least one of the first weights to obtain the third weight corresponding to the carrier. The first terminal determines the third weight corresponding to each carrier or each resource pool respectively, and determines the receiving beam of the carrier or resource pool associated with the highest or lowest third weight as the first receiving beam;

[0175] 26) Meet the beam switching time. When the first terminal determines the first receiving beam, it needs to consider whether the first terminal has sufficient beam switching time to switch from other beams to the first receiving beam. For example, when the first terminal is cross-carrier scheduled, if the subcarrier spacing (SCS) of different carrier components is different, there will be a switching time, which may cause the beam switching to take a certain amount of time. Therefore, when the first terminal selects the first receiving beam, it needs to consider whether the selected first receiving beam meets the beam switching time requirement for switching from other beams to the first receiving beam.

[0176] The first terminal determines the first receiving beam of the PSFCH according to at least one of the above rules, and clarifies how to determine the first receiving beam when there are multiple receiving beams. The various contents included in the above first rule can be used separately, and can also be used in combination without conflict. For example, when multiple receiving beams can receive the highest priority PSFCH, it can be further determined according to the number of associated carriers which receiving beam to select as the first receiving beam. Furthermore, the first terminal can also first select a carrier according to the first rule, and then select the first receiving beam on the carrier according to the first rule. It is also possible to first select the first receiving beam according to the first rule, and then select which specific carriers to use the first receiving beam to receive PSFCH according to the first rule.

[0177] In some embodiments of the present application, the method may further include at least one of the following:

[0178] 1) When the first terminal performs link failure detection based on hybrid automatic repeat request (HARQ) feedback, if the PSFCH on a non-first receiving beam is not detected, the continuous discontinuous transmission (DTX) count is not increased. It can be understood that the failure to receive the PSFCH corresponding to other receiving beams is caused by the selection of the first receiving beam, not due to poor link quality, etc. Therefore, in this case, the continuous DTX count should not be increased, otherwise it will increase the probability of the terminal judging that the link has failed;

[0179] 2) When the first terminal performs link failure detection based on HARQ feedback, if the PSFCH is not received on the first receiving beam, the continuous DTX count is increased. It can be understood that since the reception of the PSFCH is not omnidirectional but based on the first receiving beam, when the PSFCH that should be received is not received on the first receiving beam, it is determined that DTX has occurred, and the continuous DTX count should be increased, such as by 1;

[0180] 3) When the first terminal performs beam failure detection based on HARQ feedback, the reception failure of PSFCH on non-first receiving beams is not used to determine beam failure. It can be understood that when performing beam failure detection, PSFCH is not received on some beams because they do not receive PSFCH as the first receiving beam, so PSFCH cannot be detected. At this time, this result should not be used to determine beam failure of the first receiving beam or non-first receiving beam; this method is equivalent to judging whether the beam fails based on the reception status of HARQ feedback only when the beam is used as the first receiving beam.

[0181] 4) When the first terminal performs the beam failure instance count based on HARQ feedback, if the PSFCH reception on a non-first receiving beam fails, the beam failure instance is not indicated, or the beam failure instance count is not increased. It can be understood that when counting beam failure instances, the PSFCH is not received on some beams because they do not receive the PSFCH as the first receiving beam, and therefore the PSFCH cannot be detected. Therefore, new beam failure instances should not be indicated, or the beam failure instance count should not be increased at this time. Or at least, the beam failure instance of a non-first receiving beam is not indicated, or the beam failure instance count of a non-first receiving beam is not increased. This method is equivalent to determining whether a beam fails based on the reception status of HARQ feedback only when the beam is used as the first receiving beam;

[0182] 5) When the first terminal performs link failure detection based on HARQ feedback, the threshold of the continuous DTX count is greater than or equal to the first value. It can be understood that since there may be multiple beams in the link and there is only one receiving beam for PSFCH, the PSFCH corresponding to other receiving beams cannot be received. Therefore, at this time, the threshold of the continuous DTX count should be set to be greater than or equal to a certain value, such as the first value, to ensure that the probability of the first terminal judging that the link has failed will not be increased due to the impact, thereby avoiding affecting the link transmission;

[0183] 6) When the first terminal performs beam failure instance counting or beam failure detection based on HARQ feedback, the threshold of beam failure instance counting is greater than or equal to the second value. It can be understood that since there is only one PSFCH receiving beam, the PSFCH corresponding to other receiving beams cannot be received. Therefore, when these beams judge link failure, the threshold of beam failure instance counting should be set to be greater than or equal to a certain value, such as the second value, to ensure that the probability of the first terminal judging beam failure will not be increased due to the impact, thereby avoiding affecting link transmission.

[0184] The first value and the second value are predefined by the protocol, or preconfigured by the network side device, or configured by the network side device, or determined by the first terminal. It should be noted that when the first terminal determines whether the beam fails based on the result of HARQ feedback, it may be determined whether the receiving beam of the first terminal fails, or whether the transmitting beam of the first terminal fails based on beam reciprocity, or whether the transmitting beam of the second terminal fails based on the transmission of opposite data.

[0185] For ease of understanding, some technical solutions of the embodiments of the present application are described below through specific examples.

[0186] Example 1: Determining the first receive beam of PSFCH based on the first transmit resource or first transmit beam of the selected PSSCH or PSCCH

[0187] When selecting the first transmission resource or the first transmission beam of PSSCH or PSCCH, the first terminal considers the corresponding PSFCH reception beam, so that the reception probability of PSFCH is increased.

[0188] For example, if the first terminal has multiple processes or communicates with multiple receiving terminals, and if there is no determined transmission beam, then when selecting the first transmission resource or the first transmission beam, multiple processes or multiple receiving terminals can be combined for selection. For example, if the selected first transmission resource corresponds to the same PSFCH opportunity, a transmission beam that satisfies the QCL relationship is selected so that the PSFCH receiving beam can receive as many PSFCHs as possible. If the transmission beam has been determined and the transmission beam satisfies the QCL relationship, then when selecting the first resource, it is selected to correspond to the same PSFCH opportunity as much as possible. Or if the transmission beam does not satisfy the QCL relationship, then when selecting the first resource, it is selected not to correspond to the same PSFCH opportunity as much as possible.

[0189] For another example, after the first terminal determines that the PSFCH opportunity on time slot 8 uses PSFCH receive beam 1, the PSSCH or PSCCH on time slots 2 to 6 corresponding to this PSFCH opportunity uses the transmit beam that has a QCL relationship with PSFCH receive beam 1 by default.

[0190] Example 2: PSFCH reception rules

[0191] In R16 / R17, the terminal will select PSFCH for reception within the terminal capability range according to the priority order. However, in the FR2 scenario, due to the directivity of the beam, the terminal can only use one receiving beam to receive PSFCH, such as Figure 5 Therefore, the embodiment of the present application provides a new PSFCH reception rule.

[0192] The first way is to still receive according to the priority. For example, Figure 5 In the example, beam A can receive PSFCH with priority 1, and beam B can receive PSFCH with priority 2. If priority 1 is greater than priority 2, beam A is selected to receive PSFCH.

[0193] Considering that there may be a small number of high-priority PSFCHs, for example, there may be many priority 2 PSFCHs that need to be received on beam B, while beam A has only one priority 1 PSFCH and very low-priority PSFCHs, the second method can be used, that is, receiving according to the number of PSFCHs. For example, Figure 5 In the example, beam A can receive 5 PSFCHs and beam B can receive 2 PSFCHs, so beam A is selected to receive PSFCHs.

[0194] Considering that there may be a large number of PSFCHs with lower priorities, for example, the priority of PSFCH on beam A is very low, while the priority of PSFCH on beam B is 1. Therefore, when selecting the receiving beam, it is necessary to consider a variety of situations, including priority, quantity, beam quality, etc.

[0195] For example, one way is to select the receiving beam with the largest number of PSFCHs with priorities higher than a certain threshold. For example, beam A can receive 5 PSFCHs with priorities higher than 4, and beam B can receive 2 PSFCHs with priorities higher than 4, then beam A is selected to receive PSFCH. Another way is to assign a certain weight to each priority, and finally select the receiving beam with the highest weight to receive PSFCH. For example, the highest priority, such as priority 1, corresponds to a1 weight, the second highest priority, such as priority 2, corresponds to a2 weight, and so on. If the PSFCH that can be received on beam A includes 1 PSFCH with priority 1, 2 PSFCHs with priority 2, and 5 PSFCHs with priority 8, and the PSFCH that can be received on beam B includes 2 PSFCHs with priority 2 and 5 PSFCHs with priority 3, then the total weight of beam A is A1=1*a1+2*a2+5*a8, and the total weight of beam B is B1=2*a2+5*a3. If A1>B1, beam A is selected for PSFCH reception.

[0196] In addition, since beam qualities vary among beams, beam measurement results can also be taken into account. For example, beam A is assigned a weight, such as b1, and beam B is assigned a weight, such as b2, based on the beam measurement results. The total weight of beam A is A1 = b1*(1*a1+2*a2+5*a8), and the total weight of beam B is B1 = b2*(2*a2+5*a3). If A1>B1, beam A is selected for PSFCH reception.

[0197] It is understandable that if the beam with the highest priority PSFCH is selected for reception according to the existing mechanism without enhancement in other aspects, the transmission efficiency of the side link may be reduced. However, the embodiment of the present application comprehensively considers multi-dimensional characteristics, clarifies the behavior of the terminal determining the receiving beam of PSFCH for side link transmission under side link FR2, and can effectively ensure the transmission efficiency of the side link.

[0198] The sidelink transmission method provided in the embodiment of the present application may be executed by a sidelink transmission device. In the embodiment of the present application, the sidelink transmission device provided in the embodiment of the present application is described by taking the sidelink transmission device executing the sidelink transmission method as an example.

[0199] like Figure 6 As shown, the sidelink transmission device 600 may include the following modules:

[0200] A determination module 610 is used to determine a first receiving beam of a physical sidelink feedback channel PSFCH according to the first information;

[0201] A transmission module 620, configured to perform sidelink transmission based on the first receive beam;

[0202] The first information includes at least one of the following:

[0203] A first transmission resource of a physical sidelink shared channel PSSCH or a physical sidelink control channel PSCCH;

[0204] A first transmit beam of a PSSCH or a PSCCH;

[0205] Rule number one.

[0206] By applying the device provided in the embodiment of the present application, the first receiving beam of PSFCH is determined according to the first transmitting resource of PSSCH or PSCCH, the first transmitting beam of PSSCH or PSCCH, and at least one of the first rules, and sidelink transmission is performed based on the first receiving beam. The behavior of determining the receiving beam of PSFCH for sidelink transmission under sidelink FR2 is clarified, which can effectively ensure the efficiency of sidelink transmission.

[0207] In some embodiments of the present application, when the first information includes the first transmission resource or the first transmission beam, the determination module 610 is configured to:

[0208] Selecting a first transmission resource or a first transmission beam of a PSSCH or a PSCCH;

[0209] The receiving beam corresponding to the first transmission resource or the receiving beam corresponding to the first transmission beam is determined as the first receiving beam of the PSFCH.

[0210] In some embodiments of the present application, the determination module 610 is configured to perform at least one of the following:

[0211] In conjunction with different processes or different receiving terminals or different carriers, a first transmission resource or a first transmission beam of a PSSCH or a PSCCH is selected;

[0212] Based on the second rule, the first transmission resource or the first transmission beam of the PSSCH or PSCCH is selected.

[0213] In some embodiments of the present application, the second rule includes at least one of the following:

[0214] The corresponding PSFCH receiving beams may correspond to different processes or different receiving terminals or different carriers;

[0215] The corresponding PSFCH receiving beam may correspond to a maximum number of different processes or different receiving terminals or different carriers;

[0216] The transmission resources selected for different processes or different receiving terminals or different carriers correspond to different PSFCH opportunities;

[0217] The transmission resources of the PSSCH or PSCCH on the same time unit or in the same time window correspond to the same receiving terminal;

[0218] The transmission resources of PSSCH or PSCCH in the same time unit or in the same time window correspond to the same transmission beam;

[0219] The transmission resources of PSSCH or PSCCH located on different carriers in the same time unit or in the same time window correspond to the same transmission beam;

[0220] The transmission resources or transmission beams of PSSCH or PSCCH located on different carriers in the same time unit or in the same time window correspond to the reception beam of the same PSFCH.

[0221] In some embodiments of the present application, the determination module 610 is used to:

[0222] According to the beam measurement result, the first transmission resource or the first transmission beam of PSSCH or PSCCH is selected.

[0223] In some embodiments of the present application, the determination module 610 is configured to perform at least one of the following:

[0224] Selecting the transmission beam corresponding to the optimal beam measurement result as the first transmission beam of the PSSCH or PSCCH;

[0225] Selecting a first transmission resource of the PSSCH or PSCCH from a candidate resource set corresponding to the transmission beam corresponding to the optimal beam measurement result;

[0226] According to the beam measurement result, the first transmission resource of the PSSCH or PSCCH is selected from the candidate resource sets corresponding to different transmission beams based on different weights.

[0227] In some embodiments of the present application, the transmission beam corresponding to the optimal beam measurement result includes at least one of the following:

[0228] The transmit beam corresponding to the best result of the channel state information;

[0229] The beam measurement results corresponding to different receiving terminals are at least partially greater than or equal to the transmit beam of the first threshold.

[0230] In some embodiments of the present application, the reference signal received power RSRP threshold corresponding to the candidate resource sets corresponding to different transmit beams is determined according to at least one of the following:

[0231] Beam measurement results;

[0232] Multiple RSRP threshold lists configured;

[0233] A configured RSRP threshold list and multiple RSRP threshold offset values.

[0234] In some embodiments of the present application, the better the beam measurement result, the higher the RSRP threshold corresponding to the corresponding candidate resource set.

[0235] In some embodiments of the present application, the first receiving beam includes at least one of the following:

[0236] A receiving beam at a PSFCH opportunity corresponding to a time slot where a first transmitting resource or a first transmitting beam is located;

[0237] The receive beam corresponding to the Nth determined transmit resource or transmit beam in the time slot corresponding to the PSFCH opportunity, where N is a positive integer;

[0238] The receiving beam corresponding to the highest priority transmission resource or transmission beam in the time slot corresponding to the PSFCH opportunity.

[0239] In some embodiments of the present application, the determination module 610 is further configured to:

[0240] After determining a first receiving beam of a physical sidelink feedback channel PSFCH according to the first information, a second transmitting resource or a second transmitting beam of a PSSCH or a PSCCH is selected according to the first receiving beam.

[0241] In some embodiments of the present application, the determination module 610 is used to:

[0242] Selecting the transmission resource corresponding to the first receiving beam as the second transmission resource of the PSSCH or the PSCCH;

[0243] Or, the transmission beam corresponding to the first receiving beam is selected as the second transmission beam of PSSCH or PSCCH.

[0244] In some embodiments of the present application, the transmission beam corresponding to the retransmission resources of the PSSCH or PSCCH and the transmission beam corresponding to the initial transmission resources are in a quasi-co-location relationship.

[0245] In some embodiments of the present application, the determination module 610 is further configured to:

[0246] Reselecting a receiving beam of the PSFCH, or reselecting a transmitting resource or a transmitting beam of the PSSCH or PSCCH selected in the first time window;

[0247] The first time window is a time domain range corresponding to the PSFCH opportunity.

[0248] In some embodiments of the present application, the first rule includes at least one of the following:

[0249] Can receive the highest priority PSFCH;

[0250] The maximum number of PSFCHs can be received;

[0251] The highest receivable priority P1 corresponds to the largest number of PSFCHs, where P1 is a positive integer;

[0252] When the number of PSFCHs with a higher priority level that can be received is the same, the maximum number of PSFCHs with a lower priority level can be received;

[0253] Associated with the carrier or resource pool that can receive the highest priority PSFCH;

[0254] Associated with the carrier or resource pool that can receive the largest number of PSFCHs;

[0255] Associated with the carrier or resource pool corresponding to the largest number of PSFCHs at the first P2 priorities that can receive the highest priority, where P2 is a positive integer;

[0256] Associating with a carrier or resource pool that can receive the largest number of PSFCHs of a lower priority level when the number of PSFCHs of a higher priority level is the same;

[0257] The number of retransmissions of the corresponding PSFCH is greater than or equal to the second threshold;

[0258] The number of retransmissions of the corresponding PSFCH is less than or equal to the third threshold;

[0259] The number of retransmissions of the corresponding PSFCH is greater than or equal to the fourth threshold, and the number of retransmissions of the non-corresponding PSFCH is less than or equal to the fifth threshold;

[0260] The remaining number of retransmissions of the corresponding PSFCH is less than or equal to the sixth threshold;

[0261] The remaining number of retransmissions of the corresponding PSFCH is greater than or equal to the seventh threshold;

[0262] The remaining number of retransmissions of the corresponding PSFCH is less than or equal to the eighth threshold, and the remaining number of retransmissions of the non-corresponding PSFCH is greater than or equal to the ninth threshold;

[0263] PSFCH corresponding to the last transmission opportunity;

[0264] PSFCH corresponding to a non-last transmission opportunity;

[0265] The corresponding remaining transmission opportunities of the PSFCH are less than or equal to the tenth threshold;

[0266] The corresponding remaining transmission opportunities of the PSFCH are greater than or equal to the eleventh threshold;

[0267] The remaining transmission opportunities of the corresponding PSFCH are less than or equal to the twelfth threshold, and the remaining transmission opportunities of the non-corresponding PSFCH are greater than or equal to the thirteenth threshold;

[0268] The first weight determined based on the priority of the PSFCH is the highest or the lowest;

[0269] The number of associated carriers or resource pools is the largest;

[0270] The beam measurement results are optimal;

[0271] The beam measurement result is greater than or equal to the fourteenth threshold;

[0272] The second weight determined based on the beam measurement result is the highest or the lowest;

[0273] The third weight determined based on the carrier or the resource pool is the highest or the lowest;

[0274] Meet the beam switching time.

[0275] In some embodiments of the present application, the sidelink transmission device 600 further includes a processing module, configured to perform at least one of the following:

[0276] In the case of performing link failure detection based on hybrid automatic repeat request HARQ feedback, if no PSFCH on a non-first receive beam is detected, the continuous non-persistent transmission DTX count is not increased;

[0277] In the case of performing HARQ feedback based link failure detection, if PSFCH is not received on the first receive beam, the continuous DTX count is increased;

[0278] In the case of performing beam failure detection based on HARQ feedback, reception failure of PSFCH on a non-first receive beam is not used to determine beam failure;

[0279] In the case of performing beam failure instance counting based on HARQ feedback, if PSFCH reception on a non-first receiving beam fails, the beam failure instance is not indicated, or the beam failure instance count is not increased;

[0280] In the case of performing link failure detection based on HARQ feedback, the threshold of the continuous DTX count is greater than or equal to the first value;

[0281] In the case of performing beam failure instance counting or beam failure detection based on HARQ feedback, the threshold of the beam failure instance counting is greater than or equal to the second value.

[0282] The sidelink transmission device 600 in the embodiment of the present application can be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal, or it can be other devices other than a terminal. Exemplarily, the terminal can include but is not limited to the types of terminals 11 listed above, and other devices can be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiment of the present application.

[0283] The sidelink transmission device 600 provided in the embodiment of the present application can achieve Figure 4 The various processes implemented by the illustrated method embodiment achieve the same technical effect and will not be described again here to avoid repetition.

[0284] like Figure 7 As shown, the embodiment of the present application further provides a communication device 700, including a processor 701 and a memory 702, the memory 702 stores a program or instruction that can be run on the processor 701, for example, when the communication device 700 is a terminal, the program or instruction is executed by the processor 701 to implement the above Figure 4 The various steps of the method embodiment shown can achieve the same technical effect.

[0285] The embodiment of the present application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the following Figure 4 The steps in the method embodiment shown. This terminal embodiment corresponds to the above-mentioned terminal side method embodiment, and each implementation process and implementation mode of the above-mentioned method embodiment can be applied to this terminal embodiment and can achieve the same technical effect.

[0286] Specifically, Figure 8 A schematic diagram of the structure of a terminal for implementing an embodiment of the present application.

[0287] The terminal 800 includes but is not limited to: a radio frequency unit 801, a network module 802, an audio output unit 803, an input unit 804, a sensor 805, a display unit 806, a user input unit 807, an interface unit 808, a memory 809 and at least some of the components of a processor 810.

[0288] Those skilled in the art will appreciate that the terminal 800 may also include a power source (such as a battery) for supplying power to various components, and the power source may be logically connected to the processor 810 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Figure 8 The terminal structure shown in the figure does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0289] It should be understood that in the embodiment of the present application, the input unit 804 may include a graphics processing unit (GPU) 8041 and a microphone 8042, and the graphics processor 8041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 806 may include a display panel 8061, and the display panel 8061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 807 includes a touch panel 8071 and at least one of other input devices 8072. The touch panel 8071 is also called a touch screen. The touch panel 8071 may include two parts: a touch detection device and a touch controller. Other input devices 8072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0290] In the embodiment of the present application, after receiving downlink data from the network side device, the radio frequency unit 801 can transmit the data to the processor 810 for processing; in addition, the radio frequency unit 801 can send uplink data to the network side device. Generally, the radio frequency unit 801 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0291] The memory 809 can be used to store software programs or instructions and various data. The memory 809 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 809 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 809 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0292] The processor 810 may include one or more processing units; optionally, the processor 810 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 810.

[0293] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the method embodiment and achieve the same or corresponding technical effect. To avoid repetition, it will not be repeated here.

[0294] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the above-mentioned method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0295] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0296] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0297] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0298] The embodiments of the present application further provide a computer program / program product, which is stored in a storage medium and is executed by at least one processor to implement the various processes of the above-mentioned method embodiments and can achieve the same technical effect. To avoid repetition, it will not be described here.

[0299] An embodiment of the present application also provides a wireless communication system, including: a first terminal and a second terminal that performs sidelink transmission with the first terminal, wherein the first terminal can be used to execute the steps of the method embodiment described above.

[0300] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0301] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general hardware platform, and of course, can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, disk, CD, etc.), including several instructions to enable a terminal or a network-side device to execute the methods described in each embodiment of the present application.

[0302] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of the present application and the scope of protection of the claims, and these implementation methods are all within the protection of the present application.

Claims

1. A sidelink transmission method, characterized in that: include: The first terminal determines, according to the first information, a first receiving beam of a physical sidelink feedback channel PSFCH; The first terminal performs sidelink transmission based on the first receive beam; The first information includes at least one of the following: A first transmission resource of a physical sidelink shared channel PSSCH or a physical sidelink control channel PSCCH; A first transmit beam of a PSSCH or a PSCCH; Rule number one.

2. The method according to claim 1, characterized in that In a case where the first information includes the first transmission resource or the first transmission beam, the first terminal determines, according to the first information, a first receiving beam of a physical sidelink feedback channel PSFCH, including: The first terminal selects a first transmission resource or a first transmission beam of a PSSCH or a PSCCH; The first terminal determines the receiving beam corresponding to the first transmitting resource or the receiving beam corresponding to the first transmitting beam as the first receiving beam of the PSFCH.

3. The method according to claim 2, characterized in that The first terminal selects a first transmission resource or a first transmission beam of a PSSCH or a PSCCH, including at least one of the following: The first terminal selects a first transmission resource or a first transmission beam of a PSSCH or a PSCCH in conjunction with different processes or different receiving terminals or different carriers; The first terminal selects a first transmission resource or a first transmission beam of the PSSCH or PSCCH based on a second rule.

4. The method according to claim 3, characterized in that The second rule includes at least one of the following: The corresponding PSFCH receiving beams may correspond to different processes or different receiving terminals or different carriers; The corresponding PSFCH receiving beam may correspond to a maximum number of different processes or different receiving terminals or different carriers; The transmission resources selected for different processes or different receiving terminals or different carriers correspond to different PSFCH opportunities; The transmission resources of the PSSCH or PSCCH on the same time unit or in the same time window correspond to the same receiving terminal; The transmission resources of PSSCH or PSCCH in the same time unit or in the same time window correspond to the same transmission beam; The transmission resources of PSSCH or PSCCH located on different carriers in the same time unit or in the same time window correspond to the same transmission beam; The transmission resources or transmission beams of PSSCH or PSCCH located on different carriers in the same time unit or in the same time window correspond to the reception beam of the same PSFCH.

5. The method according to any one of claims 2 to 4, characterized in that The first terminal selects a first transmission resource or a first transmission beam of a PSSCH or a PSCCH, including: The first terminal selects a first transmission resource or a first transmission beam of the PSSCH or PSCCH according to the beam measurement result.

6. The method according to claim 5, characterized in that The first terminal selects a first transmission resource or a first transmission beam of a PSSCH or a PSCCH according to the beam measurement result, including at least one of the following: The first terminal selects the transmission beam corresponding to the optimal beam measurement result as the first transmission beam of the PSSCH or PSCCH; The first terminal selects a first transmission resource of a PSSCH or a PSCCH from a candidate resource set corresponding to a transmission beam corresponding to an optimal beam measurement result; The first terminal selects a first transmission resource of PSSCH or PSCCH from a candidate resource set corresponding to different transmission beams based on different weights according to the beam measurement result.

7. The method according to claim 6, characterized in that The transmission beam corresponding to the optimal beam measurement result includes at least one of the following: The transmission beam corresponding to the best result of the channel state information; The beam measurement results corresponding to different receiving terminals are at least partially greater than or equal to the transmit beam of the first threshold.

8. The method according to claim 6 or 7, characterized in that: The reference signal received power RSRP threshold corresponding to the candidate resource sets corresponding to different transmit beams is determined according to at least one of the following: Beam measurement results; Multiple RSRP threshold lists configured; A configured RSRP threshold list and multiple RSRP threshold offset values.

9. The method according to claim 8, characterized in that The better the beam measurement result, the higher the RSRP threshold corresponding to the corresponding candidate resource set.

10. The method according to any one of claims 1 to 9, characterized in that The first receive beam includes at least one of the following: A receiving beam at a PSFCH opportunity corresponding to the time slot where the first transmitting resource or the first transmitting beam is located; The receive beam corresponding to the Nth determined transmit resource or transmit beam in the time slot corresponding to the PSFCH opportunity, where N is a positive integer; The receiving beam corresponding to the highest priority transmission resource or transmission beam in the time slot corresponding to the PSFCH opportunity.

11. The method according to any one of claims 1 to 10, characterized in that After the first terminal determines a first receiving beam of a physical sidelink feedback channel PSFCH according to the first information, the method further includes: The first terminal selects a second transmission resource or a second transmission beam of the PSSCH or the PSCCH according to the first receiving beam.

12. The method according to claim 11, characterized in that The first terminal selects a second transmission resource or a second transmission beam of a PSSCH or a PSCCH according to the first reception beam, including: The first terminal selects the transmission resource corresponding to the first receiving beam as the second transmission resource of the PSSCH or the PSCCH; Or, the first terminal selects the transmission beam corresponding to the first reception beam as the second transmission beam of PSSCH or PSCCH.

13. The method according to any one of claims 1 to 12, characterized in that The transmission beam corresponding to the retransmission resources of the PSSCH or PSCCH and the transmission beam corresponding to the initial transmission resources are in a quasi-co-location relationship.

14. The method according to any one of claims 1 to 13, characterized in that The method further comprises: The first terminal reselects a receiving beam of the PSFCH, or reselects a transmitting resource or a transmitting beam of the PSSCH or PSCCH selected in the first time window; The first time window is a time domain range corresponding to the PSFCH opportunity.

15. The method according to any one of claims 1 to 14, characterized in that The first rule includes at least one of the following: Can receive the highest priority PSFCH; The maximum number of PSFCHs can be received; The highest receivable priority P1 corresponds to the largest number of PSFCHs, where P1 is a positive integer; When the number of PSFCHs with a higher priority level that can be received is the same, the maximum number of PSFCHs with a lower priority level can be received; Associated with the carrier or resource pool that can receive the highest priority PSFCH; Associated with the carrier or resource pool that can receive the largest number of PSFCHs; Associated with the carrier or resource pool corresponding to the largest number of PSFCHs at the first P2 priorities that can receive the highest priority, where P2 is a positive integer; Associating with a carrier or resource pool that can receive the largest number of PSFCHs of a lower priority level when the number of PSFCHs of a higher priority level is the same; The number of retransmissions of the corresponding PSFCH is greater than or equal to the second threshold; The number of retransmissions of the corresponding PSFCH is less than or equal to the third threshold; The number of retransmissions of the corresponding PSFCH is greater than or equal to the fourth threshold, and the number of retransmissions of the non-corresponding PSFCH is less than or equal to the fifth threshold; The remaining number of retransmissions of the corresponding PSFCH is less than or equal to the sixth threshold; The remaining number of retransmissions of the corresponding PSFCH is greater than or equal to the seventh threshold; The remaining number of retransmissions of the corresponding PSFCH is less than or equal to the eighth threshold, and the remaining number of retransmissions of the non-corresponding PSFCH is greater than or equal to the ninth threshold; PSFCH corresponding to the last transmission opportunity; PSFCH corresponding to a non-last transmission opportunity; The corresponding remaining transmission opportunities of the PSFCH are less than or equal to the tenth threshold; The corresponding remaining transmission opportunities of the PSFCH are greater than or equal to the eleventh threshold; The remaining transmission opportunities of the corresponding PSFCH are less than or equal to the twelfth threshold, and the remaining transmission opportunities of the non-corresponding PSFCH are greater than or equal to the thirteenth threshold; The first weight determined based on the priority of the PSFCH is the highest or the lowest; The number of associated carriers or resource pools is the largest; The beam measurement results are optimal; The beam measurement result is greater than or equal to the fourteenth threshold; The second weight determined based on the beam measurement result is the highest or the lowest; The third weight determined based on the carrier or the resource pool is the highest or the lowest; Meet the beam switching time.

16. The method according to any one of claims 1 to 15, characterized in that The method further comprises at least one of the following: When the first terminal performs link failure detection based on hybrid automatic repeat request HARQ feedback, if no PSFCH on a non-first receive beam is detected, then a continuous non-persistent transmission DTX count is not increased; When the first terminal performs link failure detection based on HARQ feedback, if no PSFCH is received on the first receive beam, increasing a continuous DTX count; When the first terminal performs beam failure detection based on HARQ feedback, reception failure of a PSFCH not on the first receive beam is not used to determine beam failure; When the first terminal performs beam failure instance counting based on HARQ feedback, if PSFCH reception on a non-first receiving beam fails, the beam failure instance is not indicated, or the beam failure instance count is not increased; When the first terminal performs link failure detection based on HARQ feedback, a threshold of continuous DTX count is greater than or equal to a first value; When the first terminal performs beam failure instance counting or beam failure detection based on HARQ feedback, the threshold of the beam failure instance counting is greater than or equal to the second value.

17. A sidelink transmission device, characterized in that: include: A determination module, configured to determine a first receiving beam of a physical sidelink feedback channel PSFCH according to the first information; A transmission module, configured to perform sidelink transmission based on the first receiving beam; The first information includes at least one of the following: A first transmission resource of a physical sidelink shared channel PSSCH or a physical sidelink control channel PSCCH; A first transmit beam of a PSSCH or a PSCCH; Rule number one.

18. A terminal, characterized in that: The method comprises a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the sidelink transmission method according to any one of claims 1 to 16 are implemented.

19. A readable storage medium, characterized in that: The readable storage medium stores a program or an instruction, and when the program or the instruction is executed by the processor, the steps of the sidelink transmission method according to any one of claims 1 to 16 are implemented.

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