WO2022237390A1 - 通信方法、装置及系统 - Google Patents

通信方法、装置及系统 Download PDF

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Publication number
WO2022237390A1
WO2022237390A1 PCT/CN2022/085150 CN2022085150W WO2022237390A1 WO 2022237390 A1 WO2022237390 A1 WO 2022237390A1 CN 2022085150 W CN2022085150 W CN 2022085150W WO 2022237390 A1 WO2022237390 A1 WO 2022237390A1
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WIPO (PCT)
Prior art keywords
user equipment
feedback information
counter
count value
psfch
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PCT/CN2022/085150
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English (en)
French (fr)
Inventor
刘南南
常俊仁
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to JP2023569609A priority Critical patent/JP2024518473A/ja
Priority to EP22806360.8A priority patent/EP4329343A1/en
Publication of WO2022237390A1 publication Critical patent/WO2022237390A1/zh
Priority to US18/506,615 priority patent/US20240080691A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1874—Buffer management
    • H04L1/1877—Buffer management for semi-reliable protocols, e.g. for less sensitive applications like streaming video
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/40—Resource management for direct mode communication, e.g. D2D or sidelink

Definitions

  • the present application relates to the technical field of sidelink (sidelink, SL) communication, and in particular, to an SL communication method, device and system.
  • sidelink sidelink
  • V2X Vehicle to everything
  • the Internet of Vehicles generally refers to the provision of vehicle information through sensors and vehicle-mounted terminals on the vehicle to realize vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), and vehicle-to-network (vehicle-to-network) network, V2N) and a communication network for mutual communication between vehicles and pedestrians (vehicle to pedestrian, V2P).
  • V2V vehicle-to-vehicle
  • V2I vehicle-to-infrastructure
  • V2N vehicle-to-network network
  • V2P vehicle-to-network network
  • V2X has the characteristics of wide application space, great industrial potential, and strong social benefits. It will promote the innovation and development of the automobile and information communication industries, build new models and new formats of automobile and transportation services, and promote unmanned driving, assisted driving, intelligent driving, and networked driving. The innovation and application of technologies such as , intelligent networked driving, autonomous driving, and car sharing, as well as the improvement of traffic efficiency and safety levels are all of great significance.
  • a communication link for direct communication between a terminal and other terminals may be called a sidelink (sidelink, SL) or a side link.
  • HARQ hybrid automatic repeat request
  • SL radio link failure radio link failure, RLF
  • SLRLF radio link failure
  • Embodiments of the present application provide a communication method, device, and system, so as to avoid false triggering of RLF or reduce the probability of false triggering of RLF.
  • a communication method is provided.
  • a communication device for executing the communication method may be a first user equipment or a module applied in the first user equipment, such as a chip or a chip system.
  • the following description is made by taking the execution subject as the first user equipment as an example.
  • the first user equipment sends the first data to the second user equipment through the sidelink SL; the first user equipment does not receive the first feedback information, the first user equipment initializes the first counter, or, the first counter The count value remains unchanged; wherein, the first feedback information indicates whether the second user equipment successfully receives the first data; the first counter is used for radio link failure RLF detection.
  • the first user equipment does not receive the first feedback information because it does not receive the first feedback information, but not because there is a problem in the wireless link.
  • the first counter used for RLF detection does not count the situation that the first feedback information is not received due to the first user equipment not receiving the first feedback information, which can prevent the count value of the first counter from reaching the trigger incorrectly/prematurely/too quickly
  • the count value of the RLF so as to avoid triggering the RLF by mistake, and then also reduce the communication delay and improve/guarantee the quality or reliability of the communication.
  • the first user equipment receives the first feedback information, and the first user equipment does not receive the first feedback information, the first user equipment sends the first The count value of the counter is incremented by 1.
  • the first user equipment receives but does not receive the first feedback information, and it may be that the first user equipment does not receive the first feedback information due to a radio link problem.
  • the first counter counts the situation that the first user equipment receives but does not receive the first feedback information.
  • this method increases the condition limit for the increase of the count value of the first counter, therefore, it can avoid the count value of the first counter from reaching the count value that triggers the RLF incorrectly/prematurely/too quickly, thereby avoiding erroneous Triggering the RLF can also reduce the communication delay and improve/guarantee the quality or reliability of the communication.
  • the first user equipment does not receive the first feedback information, including: receiving the first feedback information conflicts with the first transmission, and the first user equipment does not receive the first feedback information.
  • the first counter used for RLF detection does not count resource conflicts, so that the first counter can eliminate more other reasons that may cause the first user equipment not to receive the first feedback information, and try to make targeted statistics
  • the number of times that the first user equipment does not receive the first feedback information due to problems in the wireless link thereby further preventing the count value of the first counter from reaching the count value that triggers RLF incorrectly/prematurely/too quickly, thereby avoiding falsely triggering RLF , which in turn can reduce the communication delay and improve/guarantee the quality or reliability of the communication.
  • the receiving of the first feedback information conflicts with the first transmission, and the first user equipment does not receive the first feedback information, including: receiving the first feedback information Conflicts with the first transmission, and the priority of receiving the first feedback information is lower than or equal to the priority of the first transmission.
  • resource conflict occurs, and the priority of receiving the first feedback information is low, the first user equipment performs the first transmission with higher priority, but does not perform the reception of the first feedback information, resulting in not receiving The first feedback information, instead of not receiving the first feedback information due to a problem with the wireless link.
  • the first counter used for RLF detection does not count the situation that the first feedback information is not received due to the first user equipment not receiving the first feedback information, which can prevent the count value of the first counter from reaching the trigger incorrectly/prematurely/too quickly
  • the count value of the RLF so as to avoid triggering the RLF by mistake, and then also reduce the communication delay and improve/guarantee the quality or reliability of the communication.
  • the first user equipment initializing the first counter includes: the first user equipment initializing a count value of the first counter to 0.
  • the signal quality between the first user equipment and the second user equipment is greater than or equal to a first threshold.
  • the signal quality is good, it means that the wireless link is normal, and the first counter used for RLF detection does not count the situation that the first user equipment did not receive the first feedback information because the first user equipment did not receive the first feedback information, which can avoid false triggering of RLF,
  • the communication delay can also be reduced, and the quality or reliability of the communication can be improved/guaranteed.
  • the signal quality between the first user equipment and the second user equipment is less than or equal to a second threshold, and the first user equipment does not receive the first feedback information, the first user equipment increases the count value of the first counter by 1.
  • the first counter used for RLF detection counts the fact that the first user equipment has not received the first feedback information because the first user equipment has not received the first feedback information, so that the RLF can be triggered faster.
  • the first feedback information is transmitted on a physical sidelink feedback channel PSFCH.
  • the count value of the first counter is greater than or equal to a third threshold
  • the first user equipment sends first indication information to the network equipment, where the first indication information is used to Indicating that the first user equipment detects RLF.
  • the first user equipment triggers the RLF and reports it to the network device to indicate that there is an abnormality in the wireless link.
  • a communication device for implementing the above method.
  • the communication device includes a corresponding module, unit, or means (means) for implementing the above method, and the module, unit, or means may be implemented by hardware, software, or by executing corresponding software on hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • the communication device includes: a transceiver module and a processing module; the transceiver module is configured to send the first data to the second user equipment through a sidelink SL; the processing A module, configured to initialize the first counter without receiving the first feedback information, or keep the count value of the first counter unchanged; wherein the first feedback information indicates whether the second user equipment successfully receives the first data;
  • the first counter is used for radio link failure RLF detection.
  • the transceiver module is further configured to receive the first feedback information; the processing module is further configured to convert the first counter to The count value is incremented by 1.
  • not receiving the first feedback information includes: receiving the first feedback information conflicts with the first transmission, and not receiving the first feedback information.
  • not receiving the first feedback information includes: receiving the first feedback information conflicts with the first transmission, and receiving the first feedback information has a low priority equal to or equal to the priority of the first transmission.
  • the processing module being configured to initialize the first counter includes: initializing a count value of the first counter to 0.
  • the signal quality between the first user equipment and the second user equipment is greater than or equal to a first threshold.
  • the processing module is further configured to: if the signal quality between the first user equipment and the second user equipment is less than or equal to a second threshold, and the first Feedback information, and increment the count value of the first counter by 1.
  • the first feedback information is transmitted on a physical sidelink feedback channel PSFCH.
  • the transceiver module is further configured to send the first indication information to the network device when the count value of the first counter is greater than or equal to the third threshold, and the first indication information It is used to indicate that the first user equipment detects RLF.
  • a communication device for executing the communication method may be a first user equipment or a module applied to the first user equipment, such as a chip or a chip system.
  • the following description is made by taking the execution subject as the first user equipment as an example.
  • the first user equipment sends the first data to the second user equipment through the side link SL; the first user equipment does not receive the first feedback information, and the first user equipment increases the count value of the second counter by 1; wherein, the The first feedback information indicates whether the second user equipment successfully receives the first data; the second counter is used to count the number of times that the first user equipment does not receive the feedback information consecutively.
  • the first user equipment receives the first feedback information, and the first user equipment initializes the second counter.
  • initializing the second counter by the first user equipment includes: initializing the second counter to 0 by the first user equipment.
  • the count value of the second counter is greater than or equal to the fourth threshold, and the first user equipment sends the second indication information and/or the third indication information to the network equipment, or , the first user equipment triggers resource reselection.
  • the second indication information is used to indicate that the first user equipment has detected RLF, or is used to indicate that RLF has occurred, or is used to indicate that the reason for SL failure is RLF.
  • the third indication information is used to indicate that the count value of the second counter reaches (or is greater than or equal to) a fourth threshold or that the count value of the second counter reaches (or is less than or equal to) 0 or a second value, or, using When the number of times indicating that the first user equipment has not received feedback information in a row reaches a preset threshold (for example, the fourth threshold), or when the number of consecutive conflicts between the reception of feedback information and other transmissions reaches a preset threshold (for example, the fourth threshold) threshold).
  • a preset threshold for example, the fourth threshold
  • the second indication information is further used to indicate a reason of the RLF, where the reason includes that the number of times the first user equipment has not received feedback information in succession reaches the fourth threshold.
  • the first user equipment can report the second indication information (for example, the reason for triggering/detecting RLF) and/or the third indication information to the network equipment, indicating that the current resource conflict probability is very high, so that the network equipment can Correspondingly adjust certain parameters to reduce the probability of resource conflicts, which is beneficial to improve communication quality, reduce communication delay, and ensure communication reliability.
  • the first user equipment triggers/detects RLF, and the first user equipment can be asked to adopt a corresponding strategy, for example, to restore the unicast connection or re-establish the unicast connection, It is beneficial to improve communication quality, reduce communication delay, and ensure communication reliability.
  • the first user equipment triggers resource reselection, allowing the first user equipment to reselect resources, which helps reduce the probability of resource conflicts/transmission conflicts, and improves communication quality, reduce communication delay, and ensure communication reliability.
  • a communication device for implementing the above method.
  • the communication device includes a corresponding module, unit, or means (means) for implementing the above method, and the module, unit, or means may be implemented by hardware, software, or by executing corresponding software on hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • the communication apparatus includes: a transceiver module and a processing module; the transceiver module is configured to send the first data to the second user equipment through a side link SL; the processing A module, configured to increase the count value of the second counter by 1 without receiving the first feedback information; wherein, the first feedback information indicates whether the second user equipment successfully receives the first data; the second counter is used to count the The number of times that the first user equipment does not receive feedback information consecutively.
  • the transceiver module is further configured to receive the first feedback information, and the processing module is further configured to initialize the second counter.
  • the processing module being further configured to initialize the second counter includes: initializing the second counter to 0.
  • the transceiver module is further configured to: the count value of the second counter is greater than or equal to the fourth threshold, and send the second indication information and/or the third threshold to the network device.
  • the instruction information, or the processing module is used to trigger resource reselection.
  • the second indication information is used to indicate that the first user equipment has detected RLF, or is used to indicate that RLF has occurred, or is used to indicate that the reason for SL failure is RLF.
  • the third indication information is used to indicate that the count value of the second counter reaches (or is greater than or equal to) a fourth threshold or that the count value of the second counter reaches (or is less than or equal to) 0 or a second value, or, using When the number of times indicating that the first user equipment has not received feedback information in a row reaches a preset threshold (for example, the fourth threshold), or when the number of consecutive conflicts between the reception of feedback information and other transmissions reaches a preset threshold (for example, the fourth threshold) threshold).
  • a preset threshold for example, the fourth threshold
  • the second indication information is further used to indicate a reason of the RLF, where the reason includes that the number of times the first user equipment has not received feedback information consecutively reaches the fourth threshold.
  • a communication device including: a processor; the processor is configured to be coupled to a memory, and after reading a computer instruction stored in the memory, execute the method according to any one of the above aspects according to the instruction.
  • the communications device further includes a memory; the memory is used to store computer instructions.
  • the communication device further includes a communication interface; the communication interface is used for the communication device to communicate with other devices.
  • the communication interface may be a transceiver, an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit, and the like.
  • the communication device may be a chip or a chip system.
  • the communication device when the communication device is a system-on-a-chip, the communication device may be composed of a chip, or may include a chip and other discrete devices.
  • the above-mentioned communication interface may be an input/output interface, an interface circuit, an output circuit, or an input circuit on the chip or the chip system. , pins or related circuits, etc.
  • the aforementioned processor may also be embodied as a processing circuit or a logic circuit.
  • a computer-readable storage medium is provided, and instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is run on a computer, the computer can execute the method described in any one of the above-mentioned aspects.
  • a computer program product containing instructions, which, when run on a computer, enables the computer to execute the method described in any one of the above aspects.
  • the technical effect brought by any possible implementation manner of the fifth aspect to the sixth aspect may refer to the technical effect brought by the different implementation manners of the above-mentioned first aspect and the third aspect, and details are not repeated here.
  • FIG. 1 is a schematic diagram of a sending end using a parallel HARQ process to send data in the prior art
  • Fig. 2 is the schematic diagram of the SL RLF detection process based on HARQ in the prior art
  • FIG. 3 is a schematic structural diagram of a communication system provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a communication device provided in this embodiment.
  • FIG. 5 is a schematic structural diagram of a mobile terminal provided by an embodiment of the present application.
  • FIG. 6a is a flow chart of a communication method provided by an embodiment of the present application.
  • FIG. 6b is a flowchart of another communication method provided by the embodiment of the present application.
  • Fig. 7 is the schematic diagram that the SL RLF detection process based on HARQ in the prior art and the communication method that the embodiment of the application provides are used for RLF detection process;
  • FIG. 8 is a flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of another communication device provided in this embodiment.
  • a communication link for direct communication between a terminal device and other terminal devices may be called a side link or a side link (sidelink, SL).
  • the wireless communication link from the terminal device to the network device may be called an uplink (uplink, UL); the wireless communication link from the network device to the terminal device may be called a downlink (downlink, DL). Since the UL or DL interface can be called a Uu interface, the UL or DL can be called a Uu interface link.
  • terminal terminal equipment, user equipment, and UE in this application can be replaced with each other.
  • hybrid automatic repeat request hybrid automatic repeat request
  • a possible HARQ feedback mechanism is: the receiving end successfully receives data, and feeds back a positive acknowledgment (ACK) to the sending end; if the receiving end fails to receive data, feeds back a negative acknowledgment (NACK) to the sending end.
  • ACK positive acknowledgment
  • NACK negative acknowledgment
  • SL HARQ feedback is supported for unicast and multicast.
  • HARQ uses a stop-and-wait protocol to control the transmission of data. Specifically, after sending a transport block (transport block, TB), the sender stops and waits until the feedback information of the TB is received before sending the next TB. The sending end stops sending and waits for the feedback information, which will reduce the throughput.
  • transport block transport block
  • the sender can use multiple parallel HARQ processes. That is to say, when the sending end is waiting for the feedback information of one HARQ process, another HARQ process can be used to continue sending data.
  • the sending end uses the first HARQ process to send TB1, and at time T1, the sending of TB1 is completed.
  • the sending end waits for the feedback information of TB1 until the sending end receives the feedback information of TB1 at time T2.
  • the sending end may use the second HARQ process to send TB2.
  • the sender waits for the feedback information of TB2 until the sender receives the feedback information of TB2 at time T3.
  • the sending end may use the third HARQ process to send TB3.
  • a HARQ process can be identified by a HARQ process ID (process identity, process ID), or in other words, a HARQ process can be associated with a HARQ process ID.
  • HARQ process ID process identity, process ID
  • a HARQ process can be associated with a HARQ process ID.
  • the HARQ process on SL can be called SL process.
  • a user equipment (user equipment, UE) at the sending end may send sidelink control information (sidelink control information, SCI) and SL data to one or more receiving UEs.
  • SCI sidelink control information
  • SCI is used to schedule SL data.
  • SCI can include first-level SCI and second-level SCI.
  • the SL data is transmitted through a physical sidelink shared channel (PSSCH), the SL data may also be referred to as the PSSCH, which will be described uniformly here and will not be described in detail below.
  • PSSCH physical sidelink shared channel
  • the first-level SCI and the second-level SCI are described below.
  • the first level SCI can be used to schedule the second level SCI and SL data/PSSCH.
  • the first-level SCI may be transmitted through a physical sidelink control channel (physical sidelink control channel, PSCCH).
  • PSCCH physical sidelink control channel
  • the second level SCI can be used to decode SL data/PSSCH.
  • SCI or second level SCI may include SL process ID, first purpose ID (destination ID), first source ID (source ID) and communication type (cast type).
  • a set of IDs can identify an SL process, or an SL process can be associated with a set of IDs.
  • ID set may include SL process ID, first destination ID, first source ID and communication type, or, ID set may include SL process ID, first purpose ID and first source ID, or, ID set may include SL process ID , the second purpose ID, the second source ID and the communication type, or, the ID set may include the SL process ID, the second purpose ID and the second source ID.
  • the SL process ID, the first destination ID, the second destination ID, the first source ID, the second source ID and the communication type are respectively described below.
  • SL process ID can be used to identify the SL process.
  • the first target ID may be used to identify the target of the SL data scheduled by the SCI.
  • the first destination ID may be used by the physical layer of the UE at the receiving end to filter data packets.
  • the first destination ID may be a destination layer-1 ID (destination layer-1 ID).
  • layer 1 may represent the first layer in the open system interconnection reference model (OSI model), the physical layer.
  • the first purpose ID may be some bits of the second purpose ID.
  • the second purpose ID is 24 bits
  • the first purpose ID may be the lower 16 bits of the second purpose ID.
  • the second destination ID may be used to identify the destination (for example, target)/receiving end/receiving terminal of the data.
  • the second purpose ID can be used to identify a multicast or broadcast service.
  • the second destination ID may be the identifier of the destination/receiving end/receiving terminal.
  • the second destination ID may be a destination layer 2 ID (Destination Layer-2 ID).
  • the second destination ID may be used by a media access control (media access contoll, MAC) layer of the receiving terminal to filter data packets.
  • layer 2 represents the second layer in the OSI module - the data link layer, and the data link layer includes the MAC layer.
  • the first source ID may be used to identify the source of the SCI-scheduled SL data.
  • the first source ID may be used by the PHY layer of the receiving terminal to filter data packets.
  • the first source ID may be a source layer 1 ID (source layer-1 ID).
  • the first source ID may be some bits of the second source ID.
  • the second source ID is 24 bits, then the first source ID may be the lower 8 bits of the second source ID.
  • the second source ID can be used to identify the source or sender of the data.
  • the second source ID may be a source layer-2 ID (source layer-2 ID).
  • the communication type may include any one or more of unicast, multicast, and broadcast.
  • the communication type in the SCI is used to indicate that the current communication is unicast, multicast or broadcast; or, the communication type in the SCI is used to indicate that the SL data scheduled by the SCI is unicast data, multicast data or broadcast data.
  • the pair of the second source ID and the second destination ID may identify a unicast.
  • the second destination ID and the second source ID may be used.
  • the first destination ID and the first source ID may be used when the physical layer of the UE at the receiving end performs data packet filtering.
  • the collision may include: a collision in the time domain, or a collision in a time slot (slot).
  • the reception of PSFCH is associated with SCI1 and/or SL data 1. It can be understood that after the UE at the transmitting end sends SCI1 and/or SL data 1 to the UE at the receiving end, the UE at the transmitting end may receive SL HARQ feedback from the UE at the receiving end on PSFCH resource 1 (which can be understood as PSFCH reception).
  • the reception of PSFCH (for the transmission of SL data 1) conflicts with the transmission of PSFCH (associated with other data transmissions), if the priority of reception of PSFCH is lower than or equal to the priority of transmission of PSFCH (or, the reception of PSFCH is not prioritized), then the UE at the sending end of SL data 1 performs the sending of PSFCH but does not receive PSFCH, so the UE at the sending end of SL data 1 does not receive PSFCH.
  • the UE at the sending end of SL data 1 may also serve as the UE at the receiving end of SL data 2 , so as to send the PSFCH to the UE at the sending end of SL data 2 .
  • the priority of receiving or sending the PSFCH is determined by the priority of SL data associated with the PSFCH.
  • the priority field (field) in the SCI corresponding to the SL data or the first-level SCI carries the priority information of the SL data, and the smaller the value of the priority field, the higher the priority of the SL data.
  • the reception of PSFCH (for the transmission of SL data 1) conflicts with the UL transmission. If the priority of PSFCH reception is lower than or equal to the priority of UL transmission (or in other words, the reception of PSFCH is not prioritized), then the sending UE executes UL transmission without performing reception of the PSFCH, so that the transmitting UE does not receive the PSFCH.
  • “transmitting” can be understood as “sending and/or receiving”.
  • the reception of PSFCH (for transmission of SL data 1 ) colliding with UL transmission may include: the reception of PSFCH (for transmission of SL data 1 ) collides with UL transmission within one slot.
  • the priority of receiving the PSFCH in a time slot may be the highest priority among the priorities of SL data corresponding to multiple PSFCHs in the time slot.
  • the reception of PSFCH conflicts with LTE SL transmission in time, if the priority of PSFCH reception is lower than or equal to the priority of LTE SL transmission (or, the reception of PSFCH is not prioritized) , Then, the UE at the transmitting end performs LTE SL transmission, but does not perform reception of the PSFCH, so that the UE at the transmitting end does not receive the PSFCH.
  • the priority of receiving or sending the PSFCH is determined by the priority of SL data associated with the PSFCH.
  • the priority field (field) in the SCI corresponding to the SL data or the first-level SCI carries the priority information of the SL data, and the smaller the value of the priority field, the higher the priority of the SL data.
  • the sender can be understood as: the sender of data.
  • HARQ-based SL RLF detection is introduced for unicast connections.
  • the UE at the transmitting end uses a counter to count the number of consecutive times that the PFSCH has not been received. Specifically, if the UE at the transmitting end does not receive the PSFCH, the UE at the transmitting end increases the count value of the counter by 1; if the UE at the transmitting end receives the PSFCH, the UE at the transmitting end initializes/sets the count value of the counter to 0. If the count value of the counter reaches the threshold, the UE at the sending end triggers RLF.
  • MAC Medium Access Control
  • the UE at the sending end initializes/sets the count value of the counter to 0.
  • the counter may be numConsecutiveDTX
  • the threshold may be sl-maxNumConsecutiveDTX
  • the value of the threshold is configured by the network device, or the value of the threshold is pre-configured.
  • FIG. 2 shows a HARQ-based SL RLF detection process.
  • the initial value of the counter is 0, and the threshold for triggering the RLF is 3.
  • the PSFCH monitoring timing can be understood as the PSFCH or the location of the PSFCH or the time domain location of the PSFCH or the receiving timing of the PSFCH. It should be noted that only 11 PSFCH monitoring opportunities are schematically shown in FIG. 2 .
  • the actual PSFCH monitoring opportunities may or may not be continuous in the time domain, and different PSFCH monitoring opportunities may also be different in the time domain. overlap, which is not limited in this embodiment of the present application.
  • receiving the PSFCH by the UE at the transmitting end means that the UE at the transmitting end performs an action of "receiving" the PSFCH.
  • the result of "receiving" the PSFCH by the UE at the transmitting end may be that the UE at the transmitting end "receives” the PSFCH, or it may also be that the UE at the transmitting end "does not receive” the PSFCH.
  • the fact that the UE at the transmitting end "does not receive” the PSFCH means that the UE at the transmitting end does not perform the action of "receiving".
  • the transmitting end UE "receives" PSFCH and other transmission/reception of the transmitting end UE conflicts, since the priority of "receiving" PSFCH is lower than that of other transmission/reception (in other words, "receiving" PSFCH is not prioritized), The transmitting UE performs other transmission/reception without performing the action of "receiving" the PSFCH.
  • the result that the UE at the transmitting end "does not receive” the PSFCH is that the UE at the transmitting end "does not receive” the PSFCH.
  • the UE at the transmitting end does not receive the PSFCH. Therefore, the UE at the transmitting end does not receive the PSFCH.
  • the count value of the counter in the existing protocol is increased by 1, from the initial value 0 to 1.
  • the UE at the sending end receives the PSFCH, but does not receive the PSFCH.
  • the count value of the counter in the existing protocol is increased by 1 to become 2.
  • the UE at the sending end receives the PSFCH.
  • the count value of the counter in the existing protocol is initialized/set to 0.
  • the UE at the transmitting end receives the PSFCH, but does not receive the PSFCH.
  • the count value of the counter in the existing protocol is increased by 1 and becomes 1.
  • the UE at the transmitting end receives the PSFCH, but does not receive the PSFCH.
  • the count value of the counter in the existing protocol is increased by 1 to become 2.
  • the UE at the transmitting end since the reception of PSFCH conflicts with other transmissions and the reception of PSFCH is not prioritized, the UE at the transmitting end does not receive the PSFCH, and thus the UE at the transmitting end does not receive the PSFCH.
  • the count value of the counter in the existing protocol is increased by 1 to become 3. Since the count value of the counter in the existing protocol reaches the threshold, the UE at the sending end triggers the RLF.
  • the UE at the sending end receives the PSFCH.
  • the count value of the counter in the existing protocol is initialized/set to 0.
  • the UE at the transmitting end since the reception of PSFCH conflicts with other transmissions and the reception of PSFCH is not prioritized, the UE at the transmitting end does not receive PSFCH. Therefore, the UE at the transmitting end does not receive the PSFCH.
  • the count value of the counter in the existing protocol is increased by 1, from the initial value 0 to 1.
  • the UE at the transmitting end does not receive the PSFCH. Therefore, the UE at the transmitting end does not receive the PSFCH.
  • the count value of the counter in the existing protocol is increased by 1 to become 2.
  • the UE at the sending end receives the PSFCH.
  • the count value of the counter in the existing protocol is initialized/set to 0.
  • the UE at the sending end receives the PSFCH.
  • the count value of the counter is initialized/set to 0, or in other words, the count value of the first counter remains unchanged and remains 0.
  • the seventh PSFCH monitoring opportunity and subsequent PSFCH monitoring opportunities in FIG. 2 may be the PSFCH corresponding to the SL transmission performed after the unicast connection is resumed. It can be understood that, if the RLF is triggered, in order to restore the unicast connection, the seventh PSFCH monitoring opportunity in FIG. 2 and subsequent PSFCH monitoring opportunities may not exist.
  • the count value of the counter is 2 at the fifth PSFCH monitoring opportunity.
  • the UE at the transmitting end did not receive the PSFCH because the UE at the transmitting end did not receive the PSFCH, rather than the UE at the transmitting end not receiving the PSFCH due to a radio link problem.
  • the count value of the counter will increase by 1, which will cause the count value of the counter to reach the threshold value 3, which will cause the UE at the sending end to trigger RLF by mistake, which will also increase communication Delay, degrade the quality or reliability of communications.
  • the threshold is 1, using the existing HARQ-based SL RLF detection, the UE at the sending end is more likely to trigger RLF by mistake.
  • the number of times the PSFCH is not received consecutively can be understood as: the number of times the PSFCH is not received consecutively for a unicast connection (for example, a unicast connection), or, for a unicast connection (for example, a unicast connection) The number of consecutive times that all sidelink processes have not received PSFCH.
  • the unicast connection may also be called a radio resource control (radio resource control, RRC) connection of SL, or a PC5-RRC connection.
  • the unicast connection may be a logical connection between a pair of second source ID and the second destination ID; or, the unicast connection may be a pair of second source ID and the second The logical connection between the two destination IDs.
  • the unicast connection may include/replace/correspond to any one or more of the following: unicast, unicast connection, destination address, second source ID and second destination ID pair (pair). Wherein, the destination address (destination) can be understood as a pair of corresponding second source ID and second destination ID.
  • RLF in this application may include/be understood as SLRLF.
  • initialization in this application may include/replace: re-initialization.
  • the first user equipment in this application may include/replace: a HARQ entity of the first user equipment, or a SLHARQ entity of the first user equipment, or a MAC entity of the first user equipment.
  • targeting a unicast connection may include/replace: targeting a unicast connection, or, targeting a first unicast connection.
  • the SL process associated with the unicast connection in this application may include/replace any one or more of the following: an SL process associated with the destination address, an SL associated with the pair of the second source ID and the second destination ID Process, the SL process associated with the pair of the first source ID and the first destination ID.
  • At least one of the following or similar expressions refer to any combination of these items, including any combination of single or plural items.
  • at least one item (piece) of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple .
  • words such as “first” and “second” are used to distinguish the same or similar items with basically the same function and effect. Those skilled in the art can understand that words such as “first” and “second” do not limit the number and execution order, and words such as “first” and “second” do not necessarily limit the difference.
  • the method provided by the embodiment of this application is applicable but not limited to the following fields: device to device (device to device, D2D), V2X, unmanned driving (unmanned driving), automatic driving (automated driving, ADS), assisted driving (driver assistance) , ADAS), intelligent driving, connected driving, intelligent network driving, car sharing, etc.
  • the communication system in the embodiment of the present application includes but not limited to long term evolution (long term evolution, LTE) system, fifth generation (5th-generation, 5G) system, new radio (new radio, NR) system, wireless local area network (wireless local area networks, WLAN) systems and future evolution systems or multiple communication fusion systems.
  • long term evolution long term evolution
  • 5G fifth generation
  • new radio new radio
  • WLAN wireless local area network
  • future evolution systems or multiple communication fusion systems fusion systems.
  • the 5G system may be a non-standalone (NSA) 5G system or a standalone (standalone, SA) 5G system.
  • the network device in this embodiment of the present application is an entity on the network side that is used to send a signal, or receive a signal, or send a signal and receive a signal.
  • the network device may be a device deployed in a radio access network (radio access network, RAN) to provide a wireless communication function for a terminal, for example, it may be a transmission reception point (transmission reception point, TRP), a base station, various forms of control nodes (for example, a network controller, a wireless controller (for example, a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario) and the like.
  • the network equipment may be various forms of macro base stations, micro base stations (also called small cells), relay stations, access points (access point, AP), etc., and may also be antenna panels of base stations.
  • the control node may be connected to multiple base stations, and configure resources for multiple terminals covered by the multiple base stations.
  • the names of the equipment with base station functions may be different.
  • it can be called an evolved NodeB (eNB or eNodeB) in an LTE system, and it can be called a next generation node base station (gNB) in a 5G system or an NR system.
  • eNB evolved NodeB
  • gNB next generation node base station
  • the specific name of the base station in this application Not limited.
  • the network device may also be a network device in a future evolving public land mobile network (public land mobile network, PLMN).
  • the terminal in the embodiment of the present application is an entity on the user side for receiving signals, or sending signals, or receiving signals and sending signals.
  • the terminal is used to provide one or more of voice service and data connectivity service to the user.
  • a terminal may also be referred to as user equipment (UE), terminal equipment, access terminal, subscriber unit, subscriber station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device.
  • UE user equipment
  • the terminal can be a V2X device, for example, a smart car (smart car or intelligent car), a digital car (digital car), an unmanned car (unmanned car or driverless car or pilotless car or automobile), an automatic car (self-driving car or autonomous car), pure electric vehicle (pure EV or Battery EV), hybrid electric vehicle (HEV), range extended electric vehicle (range extended EV, REEV), plug-in hybrid electric vehicle (plug-in HEV, PHEV ), new energy vehicle (new energy vehicle), roadside unit (road site unit, RSU).
  • the terminal may also be a D2D device, for example, an electric meter, a water meter, and the like.
  • the terminal can also be a mobile station (mobile station, MS), a subscriber unit (subscriber unit), a drone, an Internet of things (internet of things, IoT) device, a station (station, ST) in a WLAN, a cellular phone (cellular phone) ), smart phone (smart phone), cordless phone, wireless data card, tablet computer, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop, WLL) station, personal digital processing (personal digital assistant (PDA) equipment, laptop computer (laptop computer), machine type communication (machine type communication, MTC) terminal, handheld device with wireless communication function, computing device or other processing equipment connected to a wireless modem, vehicle-mounted equipment 1.
  • Wearable devices also called wearable smart devices).
  • the terminal may also be a terminal in a next-generation communication system, for example, a terminal in a 5G system or a terminal in a future evolved PLMN, a terminal in an NR system, and the like.
  • the embodiment of the present application is applicable to the NR system, and may also be applicable to other systems, for example, other future-oriented new systems, etc., which is not specifically limited in the embodiment of the present application.
  • system and “network” may be used interchangeably.
  • the communication system 30 includes one or more user equipments 301 . Wherein, different user equipments 301 may communicate with each other through SL.
  • the first user equipment in the embodiment of the present application may be one of any two user equipments 301 communicating with each other, and the other may be the second user equipment in the embodiment of the present application.
  • the communication system further includes a network device 302 .
  • the network device 302 can communicate with the user equipment 301 respectively through UL or DL.
  • a certain user equipment 301 can send relevant request information to the network equipment 302 in order to ensure that other terminal devices that have service discontinuous reception (discontinuous reception, DRX) requirements can receive the broadcast signal.
  • DRX discontinuous reception
  • FIG. 3 is only a schematic diagram.
  • the communication system 30 may also include other network devices, such as the communication system 30 may also include core network devices, wireless relay devices and wireless backhaul devices. One or more of them are not specifically limited here.
  • the network device may be connected to the core network device in a wireless or wired manner.
  • the core network device and the network device 302 may be separate physical devices, or the functions of the core network device and the logical functions of the network device 302 may be integrated on the same physical device, or a physical device may integrate some
  • the functions of the core network device and the functions of some network devices 302 are not specifically limited in this embodiment of the present application.
  • the network device 302 in the embodiment of the present application is a device for connecting the user equipment 301 to a wireless network, and may be a base station (base station), an evolved base station (evolved NodeB, eNodeB), a sending and receiving point (transmission reception point, TRP), next generation base station (next generation NodeB, gNB) in 5G mobile communication system, base station in future mobile communication system or access in wireless-fidelity (wireless-fidelity, Wi-Fi) system A node, etc.; it may also be a module or unit that completes some functions of the base station, for example, it may be a centralized unit (central unit, CU) or a distributed unit (distributed unit, DU).
  • the embodiment of the present application does not limit the specific technology and specific device form adopted by the network device.
  • network equipment refers to wireless access network equipment.
  • the user equipment 301 in this embodiment of the present application may be a vehicle (vehicle), or a vehicle-mounted terminal installed on the vehicle for assisting the driving of the vehicle, or a chip in the vehicle-mounted terminal.
  • the user equipment 301 in this embodiment of the present application may be a device for implementing a wireless communication function, such as a terminal or a chip that may be used in a terminal.
  • the vehicle-mounted terminal or terminal mentioned above may be a UE, an access terminal, a terminal unit, a terminal station, a mobile station, a mobile station, a remote station, Remote terminal, mobile device, wireless communication device, terminal agent or UE, etc.
  • An access terminal may be a cellular telephone, a cordless telephone, a session initiation protocol (SIP) telephone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices or wearable devices, virtual reality (VR) UE, augmented reality (augmented reality, AR) UE, industrial control (industrial control) wireless terminals in self driving, wireless terminals in remote medical, wireless terminals in smart grid, wireless terminals in transportation safety, Wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • the user equipment 301 may be fixed or mobile, which is not specifically limited in this embodiment of the present application.
  • the user equipment 301 includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer.
  • the hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory).
  • the operating system may be any one or more computer operating systems that implement business processing through processes, for example, Linux operating system, Unix operating system, Android operating system, iOS operating system, or windows operating system.
  • the application layer includes applications such as browsers, address books, word processing software, and instant messaging software.
  • the embodiment of the present application does not specifically limit the specific structure of the execution subject of the method provided by the embodiment of the present application, as long as the program that records the code of the method provided by the embodiment of the present application can be run to provide the method according to the embodiment of the present application. method to communicate.
  • the execution subject of the method provided by the embodiment of the present application may be the user equipment 301, or a functional module in the user equipment 301 capable of invoking a program and executing the program.
  • the relevant functions of the user equipment 301 in the embodiment of the present application may be realized by one device, or jointly realized by multiple devices, or may be realized by one or more functional modules in one device. This is not specifically limited. It can be understood that the above functions can be network elements in hardware devices, software functions running on dedicated hardware, or a combination of hardware and software, or instantiated on a platform (for example, a cloud platform) virtualization capabilities.
  • a platform for example, a cloud platform
  • FIG. 4 is a schematic structural diagram of a communication device 40 provided by an embodiment of the present application.
  • the communication device 40 includes one or more processors 401, communication lines 402, and at least one communication interface (in FIG. 4, it is only exemplary to include a communication interface 404 and a processor 401 for illustration), optional can also include memory 403 .
  • the processor 401 may be a CPU, a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits used to control the execution of the program of the present application.
  • ASIC application-specific integrated circuit
  • Communication line 402 may include a path for connecting between different components.
  • the communication interface 404 may be a transceiver module for communicating with other devices or communication networks, such as Ethernet, RAN, wireless local area networks (wireless local area networks, WLAN) and the like.
  • the transceiving module may be a device such as a transceiver or a transceiver.
  • the communication interface 404 may also be a transceiver circuit located in the processor 401 to realize signal input and signal output of the processor.
  • the storage 403 may be a device having a storage function.
  • it can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other types of memory that can store information and instructions
  • a dynamic storage device can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be stored by a computer Any other medium, but not limited to.
  • the memory may exist independently and be connected to the processor through the communication line 402 . Memory can also be integrated with the processor.
  • the memory 403 is used to store computer-executed instructions for implementing the solution of the present application, and the execution is controlled by the processor 401 .
  • the processor 401 is configured to execute computer-executed instructions stored in the memory 403, so as to implement the communication method provided in the embodiment of the present application.
  • the processor 401 may also perform processing-related functions in the communication method provided in the following embodiments of the present application, and the communication interface 404 is responsible for communicating with other devices or communication networks. Not specifically limited.
  • the computer-executed instructions in the embodiments of the present application may also be referred to as application program codes, which is not specifically limited in the embodiments of the present application.
  • the processor 401 may include one or more CPUs, for example, CPU0 and CPU1 in FIG. 4 .
  • the communication device 40 may include multiple processors, for example, the processor 401 and the processor 407 in FIG. 4 .
  • Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor.
  • a processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (eg, computer program instructions).
  • the communication apparatus 40 may further include an output device 405 and an input device 406 .
  • Output device 405 is in communication with processor 401 and may display information in a variety of ways.
  • the aforementioned communication device 40 may be a general-purpose device or a dedicated device.
  • the communication device 40 can be a desktop computer, a portable computer, a web server, a palm computer (personal digital assistant, PDA), a mobile phone, a tablet computer, a wireless terminal device, a vehicle terminal device, an embedded device or a similar structure in FIG. 4 equipment.
  • PDA personal digital assistant
  • the embodiment of the present application does not limit the type of the communication device 40 .
  • FIG. 5 shows a schematic structural diagram of the mobile terminal 50 .
  • the mobile terminal 50 may include a processor 510, an external memory interface 520, an internal memory 521, a USB interface 530, a mobile communication module 540, a wireless communication module 550, an audio module 560, a sensor module 570, a camera 580 and a display Screen 581 etc.
  • the structure shown in the embodiment of the present application does not constitute a specific limitation on the mobile terminal 50 .
  • the mobile terminal 50 may include more or fewer components than shown in the illustration, or combine some components, or separate some components, or arrange different components.
  • the illustrated components can be realized in hardware, software or a combination of software and hardware.
  • the processor 510 may include one or more processing units, for example: the processor 510 may include an application processor (application processor, AP), a modem processor, a graphics processing unit (graphics processing unit, GPU) ), image signal processor (image signal processor, ISP), controller, memory, video codec, digital signal processor (digital signal processor, DSP), baseband processor, and/or neural network processor (neural- network processing unit, NPU), etc. Wherein, different processing units may be independent devices, or may be integrated in one or more processors.
  • application processor application processor, AP
  • modem processor graphics processing unit
  • graphics processing unit graphics processing unit
  • image signal processor image signal processor
  • ISP image signal processor
  • controller memory
  • video codec digital signal processor
  • DSP digital signal processor
  • baseband processor baseband processor
  • neural network processor neural- network processing unit
  • a memory may also be provided in the processor 510 for storing instructions and data.
  • the memory in processor 510 is a cache memory.
  • the memory may hold instructions or data that the processor 510 has just used or recycled. If the processor 510 needs to use the instruction or data again, it can be called directly from the memory. Repeated access is avoided, and the waiting time of the processor 510 is reduced, thus improving the efficiency of the system.
  • the wireless communication function of the mobile terminal 50 can be realized by the antenna 1, the antenna 2, the mobile communication module 540, the wireless communication module 550, the modem processor and the baseband processor.
  • Antenna 1 and Antenna 2 are used to transmit and receive electromagnetic wave signals.
  • the mobile communication module 540 can provide applications on the mobile terminal 50 including second generation (2rd generation, 2G)/third generation (3th generation, 3G)/fourth generation (4th generation, 4G)/fifth generation (5th generation) , 5G) and other wireless communication solutions.
  • at least part of the functional modules of the mobile communication module 540 may be set in the processor 510 .
  • at least part of the functional modules of the mobile communication module 540 and at least part of the modules of the processor 510 may be set in the same device.
  • the wireless communication module 550 can provide applications on the mobile terminal 50 including WLAN (such as Bluetooth (bluetooth, BT), wireless fidelity (wireless fidelity, WiFi) network), global navigation satellite system (global navigation satellite system, GNSS), near Wireless communication solutions such as near field communication (NFC), infrared technology (infrared, IR) or frequency modulation (frequency modulation, FM).
  • WLAN such as Bluetooth (bluetooth, BT), wireless fidelity (wireless fidelity, WiFi) network
  • global navigation satellite system global navigation satellite system, GNSS
  • near Wireless communication solutions such as near field communication (NFC), infrared technology (infrared, IR) or frequency modulation (frequency modulation, FM).
  • the antenna 1 of the mobile terminal 50 is coupled to the mobile communication module 540, and the antenna 2 is coupled to the wireless communication module 550, so that the mobile terminal 50 can communicate with the network and other devices through wireless communication technology.
  • the mobile terminal 50 implements a display function through a GPU, a display screen 581, an application processor, and the like.
  • the GPU is a microprocessor for image processing, connected to the display screen 581 and the application processor. GPUs are used to perform mathematical and geometric calculations for graphics rendering.
  • Processor 510 may include one or more GPUs that execute program instructions to generate or alter display information.
  • the display screen 581 is used to display images or videos and the like.
  • the display screen 581 includes a display panel.
  • the display panel can be a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active matrix organic light emitting diode or an active matrix organic light emitting diode (active-matrix organic light emitting diode, AMOLED), flexible light-emitting diode (flex light-emitting diode, FLED), Miniled, MicroLed, Micro-oLed or quantum dot light emitting diodes (quantum dot light emitting diodes, QLED), etc.
  • the mobile terminal 50 may include 1 or N display screens 581, where N is a positive integer greater than 1.
  • the mobile terminal 50 can realize the shooting function through the ISP, the camera 580 , the video codec, the GPU, the display screen 581 and the application processor.
  • Camera 580 is used to capture still images or video.
  • the object generates an optical image through the lens and projects it to the photosensitive element.
  • the photosensitive element may be a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor.
  • CMOS complementary metal-oxide-semiconductor
  • the photosensitive element converts the light signal into an electrical signal, and then transmits the electrical signal to the ISP to convert it into a digital image signal.
  • the ISP outputs the digital image signal to the DSP for processing.
  • DSP converts digital image signals into standard RGB, YUV and other image signals.
  • the mobile terminal 50 may include 1 or N cameras 580, where N is a positive integer greater than 1.
  • the external memory interface 520 may be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the mobile terminal 50.
  • the external memory card communicates with the processor 510 through the external memory interface 520 to implement a data storage function. Such as saving music, video and other files in the external memory card.
  • the internal memory 521 may be used to store computer executable program codes, where the executable program codes include instructions.
  • the internal memory 521 may include an area for storing programs and an area for storing data.
  • the stored program area can store an operating system, at least one application program required by a function (such as a sound playing function, an image playing function, etc.) and the like.
  • the data storage area can store data created during the use of the mobile terminal 50 (such as audio data, phonebook, etc.) and the like.
  • the internal memory 521 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, flash memory device, universal flash storage (universal flash storage, UFS) and the like.
  • the processor 510 executes various functional applications and data processing of the mobile terminal 50 by executing instructions stored in the internal memory 521 and/or instructions stored in a memory provided in the processor.
  • the sensor module 570 may include an acceleration sensor, a gyroscope sensor, a GPS sensor, a touch sensor, and the like.
  • the mobile terminal 50 may also include a charging management module, a power management module, a battery, buttons, an indicator, and one or more subscriber identity module (subscriber identity module, SIM) card interfaces, etc. any restrictions.
  • the method embodiments described below only take the first user equipment and the second user equipment as examples, but it does not limit them to be the first user equipment and the second user equipment.
  • the first user equipment and the second user equipment may be replaced by a device capable of implementing the method in this application.
  • the first user equipment may also be replaced with a chip or the first device configured in the first user equipment
  • the second user equipment may also be replaced with a chip or the second device configured in the second user equipment.
  • the first user equipment sends first data to the second user equipment through SL.
  • step S601 may include/replace: for a unicast connection, the first user equipment sends the first data to the second user equipment through SL.
  • the first data may be SL data.
  • step S601 may be replaced by: the first user equipment sends the first control information to the second user equipment through the SL, or the first user equipment sends the first control information and the first data to the second user equipment through the SL.
  • the first control information is used to schedule the first data.
  • the first control information may be SCI, or first-level SCI.
  • the first user equipment may only send the first control information to the second user equipment through SL, or may send both the first control information and the first data to the second user equipment.
  • the first user equipment sends the first control information to the second user equipment through SL, but may fail to send the first data due to some reasons (for example, because the sending of the first data conflicts with other transmissions).
  • step S601 the "via SL" in step S601 is deleted (that is, the sending of the first data and/or the first control information is not limited to link), and the first user equipment and the second user equipment are replaced by the first equipment and the second equipment for understanding.
  • the first user equipment may perform any one or more of the following steps S602, S603, and S604.
  • the first user equipment does not receive the first feedback information, and the first user equipment initializes the first counter, or the count value of the first counter remains unchanged.
  • step S602 may include/replace: for the unicast connection, the first user equipment does not receive the first feedback information, the first user equipment initializes the first counter, or the count value of the first counter remains unchanged.
  • the first feedback information may indicate whether the second user equipment successfully receives the first data.
  • the first counter may be used for RLF detection.
  • the first counter may be the same as or different from the counter used for RLF detection (for example, numConsecutiveDTX) in the existing protocol.
  • the first counter is numConsecutiveDTX.
  • any one or more of the first data, the first control information, the first feedback information, the first feedback resource, the first counter, the first indication information, the PSFCH listening opportunity, and the RLF are related to the unicast connection (
  • a unicast connection, or, the first unicast connection) is associated with/or an RRC connection of the SL (eg, an RRC connection of the SL, or, the first RRC connection of the SL).
  • the communication method provided in the embodiment of the present application may be performed for a unicast connection (for example, a unicast connection), or the communication method provided in the embodiment of the present application may be performed for a unicast connection Executed by the SL process associated with the connection (eg, all SL processes).
  • “receive” and “received” have different meanings. Specifically, “receiving” refers to the action of receiving, and the result of “receiving” may be “received” or “not received”; “not received” means that the action of receiving was not performed, and the result of “not received” is “Not Received”. That is to say, “not received” includes two situations, one is that the action of receiving is performed but not received, and the other is that the action of receiving is not performed. The description is unified here, and will not be described in detail below.
  • the first feedback information is transmitted on the first feedback resource.
  • the first feedback resource may be a PSFCH resource.
  • the first feedback information in this embodiment of the present application may be ACK/NACK information.
  • the first feedback information is ACK, indicating that the second user equipment successfully receives the first data.
  • the first feedback information is NACK, indicating that the second user equipment fails to receive the first data.
  • the expression of the first feedback information may also be replaced by PSFCH.
  • the first user equipment initializing the first counter includes: the first user equipment initializing the count value of the first counter to 0 or a first value.
  • the initial value of the first counter is 0 or the first value
  • the count value of triggering the RLF is a preset threshold (for example, the third threshold). It can be understood that the RLF will/will be triggered when the count value of the first counter reaches (or is greater than or equal to) a preset threshold (for example, the third threshold).
  • the first value may be an integer.
  • the first value may be 1, etc., which is not limited in this application.
  • the third threshold may be the same as or different from the threshold used for RLF detection (for example, sl-maxNumConsecutiveDTX) in the existing protocol.
  • the third threshold is sl-maxNumConsecutiveDTX.
  • the first user equipment may further initialize the count value of the first counter to a preset threshold (for example, a third threshold).
  • a preset threshold for example, the third threshold
  • the count value of triggering RLF is 0 or the first value. It can be understood that the count value of the first counter reaches (or is less than or equal to) 0 or the first value will/will trigger the RLF.
  • the constant count value of the first counter may include/replace: the first user equipment determines that the count value of the first counter remains unchanged, or the count value of the first counter remains unchanged.
  • the first user equipment does not receive the first feedback information, and the first user equipment initializes the first counter, or the count value of the first counter remains unchanged.
  • the first user equipment does not receive the first feedback information because it does not receive the first feedback information, rather than because it does not receive the first feedback information due to a problem with the radio link (for example, SL).
  • the first counter does not count the situation that the first user equipment does not receive the first feedback information because the first user equipment does not receive the first feedback information, so that the count value of the first counter can be prevented from reaching the count value that triggers the RLF incorrectly/prematurely/too quickly, Further, the probability of falsely triggering the RLF is reduced, and further, the communication delay can be reduced, and the quality or reliability of the communication can be improved/guaranteed.
  • the first user equipment receives the first feedback information, and the first user equipment does not receive the first feedback information, and the first user equipment increases or decreases the count value of the first counter by 1.
  • the first user equipment receives but fails to receive the first feedback information. It may be that the first user equipment fails to receive the first feedback information due to a problem with the wireless link (for example, SL).
  • the first counter counts the situation that the first user equipment receives but does not receive the first feedback information.
  • step S603 may include/replace: for a unicast connection, the first user equipment receives the first feedback information, and the first user equipment does not receive the first feedback information, the first user equipment counts the first counter The value increases or decreases by 1.
  • the first user equipment when the initial value of the first counter is 0 or the first value, and the count value of triggering RLF is a preset threshold (for example, the third threshold), the first user equipment receives the first feedback information, And the first user equipment does not receive the first feedback information, and the first user equipment increases the count value of the first counter by 1.
  • the first user equipment receives the first feedback information, And the first user equipment does not receive the first feedback information, and the first user equipment decreases the count value of the first counter by 1.
  • this method increases the conditional limit of the increase or decrease of the count value of the first counter, therefore, it can avoid the count value of the first counter from reaching the count value that triggers RLF incorrectly/prematurely/too quickly, and then Avoid triggering the RLF by mistake, thereby reducing the communication delay and improving/guaranteeing the quality or reliability of the communication.
  • the count value of the first counter may be increased by 1 or decreased by 1, that is, the granularity/step size of the change of the count value of the first counter may be 1.
  • the count value of the first counter can also be increased or decreased by a, where a is a positive integer, that is, the granularity/step size of the change of the count value of the first counter can also be a, which is not limited in this application. It can be understood that the increase or decrease of the count value of the first counter by 1 by the first user equipment may be replaced by: the first user equipment increases or decreases the count value of the first counter by a.
  • the first user equipment receives the first feedback information, and the first user equipment initializes a first counter.
  • step S604 may include/replace: for the unicast connection, the first user equipment receives first feedback information, and the first user equipment initializes a first counter.
  • the present application further includes: the count value of the first counter reaches (or is greater than or equal to) a third threshold, or the count value of the first counter reaches (or is less than or equal to) 0 or the first value,
  • the first user equipment performs any one or more of the following: the first user equipment triggers/detects RLF, and the MAC layer (or, MAC entity, or, HARQ entity, or, SL HARQ entity) of the first user equipment sends the first
  • An upper layer of the user equipment indicates that the RLF is detected, and the first user equipment sends first indication information to the network equipment.
  • the first user equipment triggering/detecting RLF may include/replace: the first user equipment determining triggering/detecting RLF.
  • the first indication information is used to indicate that the first user equipment has detected RLF, or, is used to indicate that RLF has occurred, or, is used to indicate that the cause of SL failure is RLF.
  • the first indication information is used to indicate: for the first unicast connection or the RRC connection of the first SL, the first user equipment detects RLF, or, RLF occurs, or, the cause of SL failure is RLF.
  • the first indication information may be included in sidelink UE information (SUI), which is not limited in this application.
  • SAI sidelink UE information
  • the first user equipment triggers the RLF and reports it to the network device to indicate that the radio link (eg, SL) is abnormal or the radio link (eg, SL) fails.
  • the radio link eg, SL
  • the radio link eg, SL
  • the present application further includes: the unicast connection is established, or the third threshold/first value is configured or reconfigured, and the first user equipment initializes the first counter.
  • the first user equipment does not receive the first feedback information, including: receiving the first feedback information conflicts with the first transmission, and the first user equipment does not receive the first feedback information.
  • the first counter used for RLF detection does not count resource conflicts/transmission conflicts, so that the first counter can exclude other reasons that may cause the first user equipment not to receive the first feedback information, and try to Counting the number of times the first user equipment does not receive the first feedback information due to a problem with the wireless link (for example, SL), so as to further prevent the count value of the first counter from reaching the count value that triggers the RLF incorrectly/prematurely/too quickly , so as to avoid false triggering of the RLF, thereby reducing the communication delay and improving/guaranteeing the quality or reliability of the communication.
  • a problem with the wireless link for example, SL
  • the first transmission is other transmission different from the reception of the first feedback information.
  • the first transmission may include a first sending and/or a first receiving.
  • the first transmission may be PSFCH transmission, UL transmission, or LTE SL transmission.
  • the reception of the first feedback information conflicts with the first transmission, and the first user equipment does not receive the first feedback information, including: the reception of the first feedback information conflicts with the first transmission, and the reception of the first feedback information takes precedence
  • the priority is lower than or equal to the priority of the first transmission, and the first user equipment does not receive the first feedback information; or, the reception of the first feedback information conflicts with the first transmission, and the priority of the reception of the first feedback information is lower than or Equal to the priority of the first transmission.
  • the fact that the priority of receiving the first feedback information is lower than or equal to the priority of the first transmission may be understood/replaced as: receiving the first feedback information is not prioritized.
  • the receiving priority of the first feedback information is lower than or equal to the priority of the first transmission may include: the first user equipment determines that the priority of receiving the first feedback information is lower than or equal to the priority of the first transmission .
  • the receiving of the first feedback information is not prioritized may include: the first user equipment determines that the receiving of the first feedback information is not prioritized.
  • the first user equipment performs the first transmission with a higher priority instead of receiving the first feedback information, As a result, the first feedback information is not received, rather than the first feedback information not being received due to a problem in the wireless link.
  • the first counter does not count the situation that the first user equipment does not receive the first feedback information because the first user equipment does not receive the first feedback information, so that the count value of the first counter can be prevented from reaching the count value that triggers the RLF incorrectly/prematurely/too quickly, Further, false triggering of the RLF can be avoided, and communication delay can be reduced, and communication quality or reliability can be improved/guaranteed.
  • the definition of the priority of reception or transmission, and the comparison of priorities are detailed in the PSFCH reception and other transmission/reception conflicts in the preamble of the description, and will not be repeated here.
  • FIG. 7 shows that the existing protocol and the communication method provided by the embodiment of the present application are used in the RLF detection process.
  • the initial value of the first counter and the counter in the existing protocol are both 0, and the count value for triggering the RLF is 3.
  • the process of using the existing protocol for RLF detection refer to the content described in FIG. 2 for details, and will not be repeated here.
  • the process of using the communication method provided in the embodiment of the present application for RLF detection will be described below.
  • the UE at the transmitting end does not receive the PSFCH.
  • the count value of the first counter remains unchanged and is still the initial value 0.
  • the UE at the sending end receives the PSFCH, but does not receive the PSFCH.
  • the count value of the first counter is increased by 1 to become 1.
  • the UE at the transmitting end receives the PSFCH.
  • the first counter is initialized to 0.
  • the UE at the transmitting end receives the PSFCH, but does not receive the PSFCH.
  • the count value of the first counter is increased by 1 to become 1.
  • the UE at the transmitting end receives the PSFCH, but does not receive the PSFCH.
  • the count value of the first counter is increased by 1 to become 2.
  • the UE at the transmitting end does not receive PSFCH.
  • the count value of the first counter remains unchanged and is still 2.
  • the UE at the transmitting end receives the PSFCH.
  • the first counter is initialized to 0.
  • the UE at the transmitting end does not receive PSFCH.
  • the count value of the first counter remains unchanged and is still 0.
  • the UE at the transmitting end does not receive the PSFCH.
  • the count value of the first counter remains unchanged and is still 0.
  • the UE at the sending end receives the PSFCH.
  • the first counter is initialized to 0.
  • the UE at the sending end receives the PSFCH.
  • the count value of the first counter remains unchanged and is still 0, or in other words, the first counter is initialized to 0.
  • FIG. 7 only shows the PSFCH monitoring opportunity associated with the first unicast connection or the RRC connection of the first SL, and the PSFCH reception associated with other unicast connections or multicast communication is not related to this solution , not shown in the figure.
  • PSFCH monitoring opportunities are schematically shown in FIG. 7 , and the actual PSFCH monitoring opportunities may or may not be continuous in the time domain. Different PSFCH monitoring opportunities may also be different in the time domain. overlap, which is not limited in this embodiment of the present application.
  • the first user equipment in the communication method provided by the embodiment of the present application will not accidentally trigger RLF at the 6th PSFCH monitoring opportunity, which can also reduce the communication delay, improve/guarantee Quality or reliability of communications.
  • the present application further includes: the signal quality between the first user equipment and the second user equipment is greater than or equal to the first threshold, and after performing step S601, the first user equipment executes Any one or more of steps S602, S603, and S604.
  • the signal quality between the first user equipment and the second user equipment being greater than or equal to the first threshold may include: the first user equipment determining/judging that the signal quality between the first user equipment and the second user equipment is greater than or equal to equal to the first threshold.
  • step S601 is not limited in this application.
  • the signal quality between the first user equipment and the second user equipment is greater than or equal to the first threshold, which may be understood as the signal quality between the first user equipment and the second user equipment is better.
  • the signal quality is good, it means that the wireless link is normal, and the first counter used for RLF detection does not count the situation that the first feedback information is not received because the first user equipment does not receive the first feedback information. Avoid triggering the RLF by mistake, thereby reducing the communication delay and improving/guaranteeing the quality or reliability of the communication.
  • the determination of the signal quality between the first user equipment and the second user equipment may be based on reference signal received power (reference signal received power, RSRP), reference signal received quality (reference signal received quality, RSRQ ), channel state information (channel state information, CSI), SL-CSI, or sounding reference signal (sounding reference signal, SRS), etc., this application does not make any limitation on this.
  • the present application further includes: the signal quality between the first user equipment and the second user equipment is less than or equal to the second threshold, as shown in FIG. 6b, the first user equipment After step S601 is executed, steps S605 and/or S606 are executed.
  • the signal quality between the first user equipment and the second user equipment being less than or equal to the second threshold may include: the first user equipment determining/judging that the signal quality between the first user equipment and the second user equipment is less than or equal to equal to the second threshold.
  • step S601 is not limited in this application.
  • the signal quality between the first user equipment and the second user equipment is less than or equal to the second threshold, which may be understood as the signal quality between the first user equipment and the second user equipment is poor.
  • the first user equipment does not receive the first feedback information, and the first user equipment increases the count value of the first counter by 1.
  • step S605 may include/replace: for the unicast connection, the first user equipment does not receive the first feedback information, and the first user equipment increases the count value of the first counter by 1.
  • the failure of the first user equipment to receive the first feedback information includes: the first user equipment does not receive the first feedback information, and/or the first user equipment receives the first feedback information, and the first user equipment does not receive the first feedback information .
  • the first user equipment receives the first feedback information, and the first user equipment initializes the first counter, or the count value of the first counter remains unchanged.
  • step S606 may include/replace: for the unicast connection, the first user equipment receives the first feedback information, and the first user equipment initializes the first counter, or the count value of the first counter remains unchanged.
  • the first counter used for RLF detection counts the fact that the first user equipment has not received the first feedback information due to the fact that the first user equipment has not received the first feedback information, so that RLF can be triggered faster, and further, recovery/ The unicast connection is reestablished to reduce communication delay.
  • first threshold and the second threshold may be the same or different, which is not limited in this application.
  • implementation mode 1 and implementation mode 2 can be regarded as separate embodiments respectively (or in other words, implementation mode 2 may not depend on implementation mode 1, or in other words, implementation mode 2 may not depend on steps S602, S603, and S604) , or implementation 1 and implementation 2 may be combined with each other (or in other words, any one or more of steps S602, S603, and S604 may be combined with steps S605 and/or S606), which is not limited in the present invention.
  • the communication method includes the following steps:
  • the first user equipment sends first data to the second user equipment through SL.
  • step S80 For the description of step S801, reference may be made to the relevant description of step S601, which will not be repeated here.
  • the first user equipment may perform steps S802 and/or S803.
  • the first user equipment does not receive the first feedback information, and the first user equipment increases or decreases the count value of the second counter by 1.
  • the first feedback information indicates whether the second user equipment successfully receives the first data.
  • the second counter is used to count the number of times that the first user equipment does not receive the feedback information consecutively.
  • step 801 may include/replace: for a unicast connection, the first user equipment does not receive the first feedback information, and the first user equipment increases or decreases the count value of the second counter by 1.
  • An entry is associated with a unicast connection (eg, a unicast connection, or, the first unicast connection) and/or an SL's RRC connection (eg, an SL's RRC connection, or, the first SL's RRC connection).
  • the communication method provided in the embodiment of the present application may be performed for a unicast connection (for example, a unicast connection), or the communication method provided in the embodiment of the present application may be performed for a unicast connection Executed by the SL process associated with the connection (eg, all SL processes).
  • the count value of the second counter can be increased by 1 or decreased by 1, that is, the granularity/step size of the change of the count value of the second counter can be 1.
  • the count value of the second counter may also be increased by b or decreased by b, where b is a positive integer, that is, the granularity/step size of the change of the count value of the second counter may also be b, which is not limited in this application.
  • the first user equipment increasing or decreasing the count value of the second counter by 1 may be replaced by: the first user equipment increasing or decreasing the count value of the second counter by b.
  • the second counter can be used alone, or the second counter can be used simultaneously with the first counter provided by the embodiment of the present application, or the second counter can be used simultaneously with the counter in the existing protocol shown in FIG. 2 This application does not make any limitation on this.
  • the first user equipment receives the first feedback information, and the first user equipment initializes the second counter.
  • step 802 may include/replace: for the unicast connection, the first user equipment receives the first feedback information, and the first user equipment initializes the second counter.
  • the first user equipment initializing the second counter includes: the first user equipment initializing a count value of the second counter to 0 or a second value.
  • the initial value of the second counter is 0 or the second value, triggering RLF, triggering the sending of the second indication information and/or the third indication information, and triggering any one or more items of resource reselection
  • the count value is a preset threshold (for example, the fourth threshold). It can be understood that when the count value of the second counter reaches (or is greater than or equal to) a preset threshold (for example, the fourth threshold), it will/will trigger RLF, trigger the sending of the second indication information and/or the third indication information, Any one or more items that trigger resource reselection.
  • the second value may be an integer.
  • the second value may be 1, etc., which is not limited in this application.
  • resource reselection may include SL resource reselection.
  • the first user equipment may further initialize the count value of the second counter to a preset threshold (for example, a fourth threshold).
  • the initial value of the second counter is a preset threshold (for example, the fourth threshold), triggering any one of RLF, triggering the sending of the second indication information and/or the third indication information, and triggering resource reselection
  • the count value of one or more items is 0 or the second value. It can be understood that when the count value of the second counter reaches (or is less than or equal to) 0 or the second value will/will trigger RLF, trigger the sending of the second indication information and/or the third indication information, and trigger resource reselection any one or more of .
  • any one or more items of triggering RLF, triggering the sending of the second indication information and/or third indication information, and triggering resource reselection When the count value is a preset threshold (for example, the fourth threshold), the first user equipment receives the first feedback information, and the first user equipment does not receive the first feedback information, the first user equipment counts the second counter The value is incremented by 1.
  • the initial value of the second counter is a preset threshold (for example, the fourth threshold)
  • any one of triggering RLF, triggering the sending of the second indication information and/or the third indication information, and triggering resource reselection When the count value of one or more items is 0 or the second value, the first user equipment receives the first feedback information, and the first user equipment does not receive the first feedback information, the first user equipment counts the count of the second counter The value is reduced by 1.
  • the present application further includes: the unicast connection is established, or the fourth threshold/second value is configured or reconfigured, and the first user equipment initializes the second counter.
  • the present application further includes: the count value of the second counter reaches (or is greater than or equal to) a fourth threshold, or the count value of the second counter reaches (or is less than or equal to) 0 or a second value,
  • the first user equipment performs any one or more of the following: the first user equipment triggers/detects RLF, and the MAC layer (or, MAC entity, or, HARQ entity, or, SL HARQ entity) of the first user equipment sends the first
  • the upper layer (for example, RRC layer) of the user equipment indicates that the RLF is detected, the first user equipment sends the second indication information and/or the third indication information to the network equipment, or the first user equipment triggers resource reselection.
  • the first user equipment triggering/detecting RLF may include/replace: the first user equipment determining triggering/detecting RLF.
  • the second indication information is used to indicate that the first user equipment has detected RLF, or is used to indicate that RLF has occurred, or is used to indicate that the reason for SL failure is RLF.
  • the third indication information is used to indicate that the count value of the second counter reaches (or is greater than or equal to) the fourth threshold or the count value of the second counter reaches (or is less than or equal to) 0 or the second value, or, It is used to indicate that the number of times that the first user equipment has not received the feedback information in a row reaches a preset threshold (for example, the fourth threshold), or is used to indicate that the number of consecutive conflicts between the reception of the feedback information and other transmissions reaches the preset threshold (for example, the fourth threshold) four thresholds).
  • a preset threshold for example, the fourth threshold
  • the second indication information is used to indicate: for the first unicast connection or the RRC connection of the first SL, the first user equipment detects RLF, or, RLF occurs, or, the cause of SL failure is RLF.
  • the third indication information is used to indicate: for the first unicast connection or the RRC connection of the first SL, the count value of the second counter reaches (or is greater than or equal to) the fourth threshold or the count value of the second counter Reaching (or, less than or equal to) 0 or the second value, or, the number of times the first user equipment has not received feedback information in succession reaches a preset threshold (for example, the fourth threshold), or, the reception of feedback information and other transmissions are continuous The number of conflicts reaches a preset threshold (for example, a fourth threshold).
  • the second indication information may be the same as or different from the first indication information, which is not limited in this application.
  • the second indication information may also be used to indicate the reason for triggering/detecting the RLF.
  • the reason may include that the number of consecutive times that the first user equipment does not receive feedback information reaches a preset threshold (for example, the fourth threshold), or that the number of consecutive conflicts between the reception of feedback information and other transmissions reaches a preset threshold (for example, the fourth threshold). threshold), or, the count value of the second counter reaches (or, is greater than or equal to) the fourth threshold value or the count value of the second counter reaches (or, is less than or equal to) 0 or the second value.
  • the second indication information and/or the third indication information may be included in sidelink UE information (SUI), which is not limited in this application.
  • SAI sidelink UE information
  • the first user equipment may report the second indication information (for example, the reason for triggering/detecting RLF) and/or the third indication information to the network equipment, indicating to the network that At present, the probability of resource conflict/transmission conflict is very high (in other words, it indicates to the network that the number of current resource conflict/transmission conflict has reached a certain threshold), so that the network device can adjust some parameters accordingly to reduce resource conflict/transmission
  • the probability of conflict is conducive to improving communication quality, reducing communication delay, and ensuring communication reliability.
  • the first user equipment when the first user equipment triggers/detects RLF, the first user equipment can be asked to adopt a corresponding strategy, for example, to restore the unicast connection or re-establish the unicast connection. It is beneficial to improve communication quality, reduce communication delay, and ensure communication reliability.
  • the first user equipment triggers resource reselection, which allows the first user equipment to reselect resources, which is beneficial to reduce the probability of resource conflict/transmission conflict, and is conducive to improving communication quality , Reduce communication delay and ensure communication reliability.
  • the actions of the first user equipment in the above embodiment can be controlled by the The processor 401 invokes the application program code stored in the memory 403 to instruct the first user equipment to execute, which is not limited in this embodiment.
  • the actions of the first user equipment in the above steps S601-S602 and steps S801-S802 may be called by the processor 510 in the mobile terminal 50 shown in FIG.
  • the application code stored in the external memory is executed by instructing the mobile terminal. This embodiment does not impose any limitation on this.
  • the methods and/or steps implemented by the first user equipment may also be implemented by components (such as chips or circuits) that can be used for the first user equipment.
  • the embodiment of the present application further provides a communication device, and the communication device is used to implement the above-mentioned various methods.
  • the communication apparatus may be the first user equipment in the foregoing method embodiments, or an apparatus including the foregoing first user equipment, or a component that may be used for the first user equipment.
  • the communication device includes hardware structures and/or software modules corresponding to each function. Those skilled in the art should easily realize that the present application can be implemented in the form of hardware or a combination of hardware and computer software in combination with the units and algorithm steps of each example described in the embodiments disclosed herein.
  • the embodiment of the present application may divide the functional modules of the communication device according to the above method embodiments.
  • each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
  • the above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. It should be noted that the division of modules in the embodiment of the present application is schematic, and is only a logical function division, and there may be other division methods in actual implementation.
  • FIG. 9 shows a schematic structural diagram of a communication device 90 .
  • the communication device 90 includes a transceiver module 901 and a processing module 902 .
  • the transceiver module 901 may also be referred to as a transceiver unit to implement a transceiver function, for example, it may be a transceiver circuit, a transceiver, a transceiver or a communication interface.
  • the transceiver module 901 is configured to send the first data to the second user equipment through the side link SL.
  • the processing module 902 is configured to initialize the first counter if the first feedback information is not received, or keep the count value of the first counter unchanged. Wherein, the first feedback information indicates whether the second user equipment successfully receives the first data; the first counter is used for RLF detection.
  • the transceiver module 901 is further configured to receive first feedback information.
  • the processing module 902 is further configured to increase the count value of the first counter by 1 if the first feedback information is not received.
  • not receiving the first feedback information includes: not receiving the first feedback information if the receiving of the first feedback information conflicts with the first transmission.
  • not receiving the first feedback information includes: if the receiving of the first feedback information conflicts with the first transmission, and the priority of receiving the first feedback information is lower than or equal to the priority of the first transmission , the first feedback information is not received.
  • the processing module 902 being configured to initialize the first counter includes: initializing a count value of the first counter to 0.
  • the processing module 902 is further configured to set the count value of the first counter to The value is incremented by 1.
  • the transceiver module 901 is further configured to send the first indication information to the network device when the count value of the first counter is greater than or equal to the third threshold, and the first indication information is used to indicate that the first user equipment detects RLF.
  • the communication device 90 is presented in the form of dividing various functional modules in an integrated manner.
  • a “module” here may refer to a specific ASIC, a circuit, a processor and a memory executing one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the functions described above.
  • the communication device 90 When the communication device 90 is the first user equipment in the above method embodiment, in a simple embodiment, those skilled in the art can imagine that the communication device 90 may take the form shown in FIG. 4 .
  • the processor 401 or 407 in the first user equipment shown in FIG. 4 may invoke the computer-executed instructions stored in the memory 403, so that the first user equipment executes the communication method in the foregoing method embodiments.
  • the functions/implementation process of the transceiver module 901 and the processing module 902 in FIG. 9 may be realized by calling the computer-executed instructions stored in the memory by the processor 401 or 407 in the first user equipment shown in FIG. 4 .
  • the function/implementation process of the processing module 902 in FIG. 9 may be implemented by the processor 401 or 407 in the first user equipment shown in FIG.
  • the function/implementation process of can be realized through the communication interface 404 shown in FIG. 4 .
  • the communication device 90 is the first user equipment in the above method embodiment, and the first user equipment is a mobile terminal, in a simple embodiment, those skilled in the art can imagine that the communication device 90 can use the A form of mobile terminal 50 is shown.
  • the processor 510 in the mobile terminal 50 shown in FIG. 5 can execute instructions stored in the memory (including the internal memory 521 or the external memory connected to the external memory interface 520) to make the mobile terminal 50 execute the above method.
  • the functions/implementation process of the transceiver module 901 and the processing module 902 in FIG. 9 can be implemented by the processor 510 in the mobile terminal 50 shown in FIG. 5 invoking computer-executed instructions stored in the memory.
  • the function/implementation process of the processing module 902 in FIG. 9 can be implemented by the processor 510 in the mobile terminal 50 shown in FIG.
  • the implementation process can be realized through the wireless communication module 550 shown in FIG. 5 .
  • the communication device 90 provided in this embodiment can execute the above-mentioned communication method, the technical effect it can obtain can refer to the above-mentioned method embodiment, and details are not repeated here.
  • one or more of the above modules or units may be implemented by software, hardware or a combination of both.
  • the software exists in the form of computer program instructions and is stored in the memory, and the processor can be used to execute the program instructions and realize the above method flow.
  • the processor can be built into a SoC (system on a chip) or ASIC, or it can be an independent semiconductor chip.
  • the core of the processor is used to execute software instructions for calculation or processing, and can further include necessary hardware accelerators, such as field programmable gate array (field programmable gate array, FPGA), PLD (programmable logic device) , or a logic circuit that implements a dedicated logic operation.
  • the hardware can be CPU, microprocessor, digital signal processing (digital signal processing, DSP) chip, microcontroller unit (microcontroller unit, MCU), artificial intelligence processor, ASIC, Any one or any combination of SoC, FPGA, PLD, dedicated digital circuit, hardware accelerator or non-integrated discrete device, which can run necessary software or not depend on software to execute the above method flow.
  • an embodiment of the present application further provides a chip system, including: at least one processor and an interface, the at least one processor is coupled to the memory through the interface, and when the at least one processor executes the computer program or instruction in the memory When, the method in any one of the above method embodiments is executed.
  • the communication device further includes a memory.
  • the system-on-a-chip may consist of a chip, or may include a chip and other discrete devices, which is not specifically limited in this embodiment of the present application.
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • a software program it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server, or data center Transmission to another website site, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or may be a data storage device including one or more servers, data centers, etc. that can be integrated with the medium.
  • the available medium may be a magnetic medium (such as a floppy disk, a hard disk, or a magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (solid state disk, SSD)), etc.

Abstract

本申请实施例提供通信方法、装置及系统，用于避免RLF的误触发或降低误触发无线链路失败RLF的概率。方法包括：第一用户设备通过侧行链路SL向第二用户设备发送第一数据；第一用户设备未接收第一反馈信息，第一用户设备将第一计数器初始化，或者，第一计数器的计数值不变；其中，第一反馈信息指示第二用户设备是否成功接收第一数据；第一计数器用于RLF检测。

Description

通信方法、装置及系统
本申请要求于2021年05月10日提交国家知识产权局、申请号为202110507117.9、申请名称为“通信方法、装置及系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及侧行链路(sidelink，SL)通信技术领域，尤其涉及SL通信方法、装置及系统。
背景技术
车联网(vehicle to everything，V2X)是智能交通运输系统的关键技术，被认为是物联网体系中最有产业潜力、市场需求最明确的领域之一。车联网一般是指通过装载在车上的传感器、车载终端等提供车辆信息，实现车辆到车辆(vehicle to vehicle，V2V)，车辆到基础设施(vehicle to infrastructure，V2I)，车辆到网络(vehicle to network，V2N)以及车辆到行人(vehicle to pedestrian，V2P)之间的相互通信的通信网络。
V2X具有应用空间广、产业潜力大、社会效益强的特点，对促进汽车和信息通信产业创新发展，构建汽车和交通服务新模式新业态，推动无人驾驶、辅助驾驶、智能驾驶、网联驾驶、智能网联驾驶、自动驾驶、汽车共享等技术的创新和应用，以及提高交通效率和安全水平等都具有重要意义。
一般的，在V2X场景下，终端与其他终端之间进行直连通信的通信链路可以称之为侧行链路(sidelink，SL)或者边链路。
目前，在新无线(new radio，NR)V2X中，对于单播和组播，在SL上支持混合自动重传请求(hybrid automatic repeat request,HARQ)反馈，其中，HARQ反馈在物理侧行链路反馈信道(physical sidelink feedback channel，PSFCH)上传输。且对于单播，可以基于HARQ检测SL无线链路失败(radio link failure，RLF)，具体为：通过连续未接收到PFSCH的次数达到一定阈值来触发SLRLF。然而，现有技术中，可能会导致发送端误触发RLF。
发明内容
本申请实施例提供通信方法、装置及系统，用于避免RLF的误触发或降低误触发RLF的概率。
为达到上述目的，本申请的实施例采用如下技术方案：
第一方面，提供了一种通信方法，执行该通信方法的通信装置可以为第一用户设备也可以为应用于第一用户设备中的模块，例如芯片或芯片系统。下面以执行主体为第一用户设备为例进行描述。第一用户设备通过侧行链路SL向第二用户设备发送第一数据；该第一用户设备未接收第一反馈信息，该第一用户设备将第一计数器初始化，或者，该第一计数器的计数值不变；其中，该第一反馈信息指示该第二用户设备是否成功接收该第一数据；该第一计数器用于无线链路失败RLF检测。在本申请实施例提供的通信方法中，第一用户设备由于未接收第一反馈信息导致未接收到第一反馈信息，而并非由于无线链路存在 问题导致未接收到第一反馈信息。用于RLF检测的第一计数器不统计由于第一用户设备未接收第一反馈信息导致未接收到第一反馈信息的情况，能够避免第一计数器的计数值错误/过早/过快地达到触发RLF的计数值，进而避免误触发RLF，进而也可以降低通信时延、提高/保证通信的质量或可靠性。
结合上述第一方面，在一种可能的实现方式中，该第一用户设备接收该第一反馈信息，并且该第一用户设备未接收到该第一反馈信息，该第一用户设备将第一计数器的计数值增加1。在该方法中，第一用户设备接收但未接收到第一反馈信息，可能是由于无线链路存在问题导致第一用户设备未接收到第一反馈信息。第一计数器统计第一用户设备接收但未接收到第一反馈信息的情况。相比于现有技术，该方法增加了第一计数器的计数值增加的条件限制，因此，能够避免第一计数器的计数值错误/过早/过快地达到触发RLF的计数值，进而避免误触发RLF，进而也可以降低通信时延、提高/保证通信的质量或可靠性。
结合上述第一方面，在一种可能的实现方式中，该第一用户设备未接收第一反馈信息，包括：该第一反馈信息的接收与第一传输冲突，该第一用户设备未接收该第一反馈信息。在该方法中，用于RLF检测的第一计数器不统计资源冲突的情况，能够使得第一计数器排除更多其他可能导致第一用户设备未接收到第一反馈信息的原因，尽量针对性地统计由于无线链路存在问题导致第一用户设备未接收到第一反馈信息的次数，从而进一步避免第一计数器的计数值错误/过早/过快地达到触发RLF的计数值，进而避免误触发RLF，进而也可以降低通信时延、提高/保证通信的质量或可靠性。
结合上述第一方面，在一种可能的实现方式中，该第一反馈信息的接收与第一传输冲突，该第一用户设备未接收该第一反馈信息，包括：该第一反馈信息的接收与该第一传输冲突，并且该第一反馈信息的接收的优先级低于或等于该第一传输的优先级。在该方法中，发生资源冲突，并且第一反馈信息的接收的优先级较低，第一用户设备执行优先级较高的第一传输，而不执行第一反馈信息的接收，导致未接收到第一反馈信息，而并非由于无线链路存在问题导致未接收到第一反馈信息。用于RLF检测的第一计数器不统计由于第一用户设备未接收第一反馈信息导致未接收到第一反馈信息的情况，能够避免第一计数器的计数值错误/过早/过快地达到触发RLF的计数值，进而避免误触发RLF，进而也可以降低通信时延、提高/保证通信的质量或可靠性。
结合上述第一方面，在一种可能的实现方式中，该第一用户设备将该第一计数器初始化包括：该第一用户设备将该第一计数器的计数值初始化为0。
结合上述第一方面，在一种可能的实现方式中，该第一用户设备与该第二用户设备之间的信号质量大于或等于第一阈值。信号质量较好时，说明无线链路正常，用于RLF检测的第一计数器不统计由于第一用户设备未接收第一反馈信息导致未接收到第一反馈信息的情况，能够避免误触发RLF，进而也可以降低通信时延、提高/保证通信的质量或可靠性。
结合上述第一方面，在一种可能的实现方式中，该第一用户设备与该第二用户设备之间的信号质量小于或者等于第二阈值，该第一用户设备未接收到该第一反馈信息，该第一用户设备将该第一计数器的计数值增加1。信号质量较差时，说明无线链路可能存在异常。这种情况下，用于RLF检测的第一计数器统计由于第一用户设备未接收第一反馈信息导致未接收到第一反馈信息的情况，能够更快地触发RLF。
结合上述第一方面，在一种可能的实现方式中，该第一反馈信息在物理侧行反馈信道 PSFCH上传输。
结合上述第一方面，在一种可能的实现方式中，该第一计数器的计数值大于或等于第三阈值，该第一用户设备向网络设备发送第一指示信息，该第一指示信息用于指示该第一用户设备检测到RLF。第一用户设备触发RLF，并上报至网络设备，以表明无线链路存在异常。
第二方面，提供了一种通信装置用于实现上述方法。该通信装置包括实现上述方法相应的模块、单元、或手段(means)，该模块、单元、或means可以通过硬件实现，软件实现，或者通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块或单元。
结合上述第二方面，在一种可能的实现方式中，该通信装置包括：收发模块和处理模块；该收发模块，用于通过侧行链路SL向第二用户设备发送第一数据；该处理模块，用于未接收第一反馈信息，将第一计数器初始化，或者，该第一计数器的计数值不变；其中，该第一反馈信息指示该第二用户设备是否成功接收该第一数据；该第一计数器用于无线链路失败RLF检测。
结合上述第二方面，在一种可能的实现方式中，该收发模块，还用于接收该第一反馈信息；该处理模块，还用于未接收到该第一反馈信息，将第一计数器的计数值增加1。
结合上述第二方面，在一种可能的实现方式中，未接收第一反馈信息，包括：该第一反馈信息的接收与第一传输冲突，未接收该第一反馈信息。
结合上述第二方面，在一种可能的实现方式中，未接收第一反馈信息，包括：该第一反馈信息的接收与该第一传输冲突，并且该第一反馈信息的接收的优先级低于或等于该第一传输的优先级。
结合上述第二方面，在一种可能的实现方式中，该处理模块用于将该第一计数器初始化包括：用于将该第一计数器的计数值初始化为0。
结合上述第二方面，在一种可能的实现方式中，该第一用户设备与该第二用户设备之间的信号质量大于或等于第一阈值。
结合上述第二方面，在一种可能的实现方式中，该处理模块还用于该第一用户设备与该第二用户设备之间的信号质量小于或者等于第二阈值，未接收到该第一反馈信息，将该第一计数器的计数值增加1。
结合上述第二方面，在一种可能的实现方式中，该第一反馈信息在物理侧行反馈信道PSFCH上传输。
结合上述第二方面，在一种可能的实现方式中，该收发模块，还用于该第一计数器的计数值大于或等于第三阈值，向网络设备发送第一指示信息，该第一指示信息用于指示该第一用户设备检测到RLF。
上述第二方面及第二方面中任一种可能的实现方式所带来的技术效果可参见上述第一方面及第一方面的不同实现方式所带来的技术效果，此处不再赘述。
第三方面，提供了一种通信方法，执行该通信方法的通信装置可以为第一用户设备也可以为应用于第一用户设备中的模块，例如芯片或芯片系统。下面以执行主体为第一用户设备为例进行描述。第一用户设备通过侧行链路SL向第二用户设备发送第一数据；该第一用户设备未接收第一反馈信息，该第一用户设备将第二计数器的计数值增加1；其中， 该第一反馈信息指示该第二用户设备是否成功接收该第一数据；该第二计数器用于统计该第一用户设备连续未接收反馈信息的次数。
结合上述第三方面，在一种可能的实现方式中，该第一用户设备接收该第一反馈信息，该第一用户设备将该第二计数器初始化。
结合上述第三方面，在一种可能的实现方式中，该第一用户设备将该第二计数器初始化，包括：该第一用户设备将该第二计数器初始化为0。
结合上述第三方面，在一种可能的实现方式中，该第二计数器的计数值大于或等于第四阈值，第一用户设备向网络设备发送第二指示信息和/或第三指示信息，或，第一用户设备触发资源重选。该第二指示信息用于指示该第一用户设备检测到RLF，或，用于指示发生了RLF，或，用于指示SL失败的原因为RLF。该第三指示信息用于指示第二计数器的计数值达到(或，大于或等于)第四阈值或第二计数器的计数值达到(或，小于或等于)0或第二取值，或，用于指示第一用户设备连续未接收反馈信息的次数达到预设阈值(例如，第四阈值)，或，用于指示反馈信息的接收和其他传输连续冲突的次数达到预设阈值(例如，第四阈值)。
结合上述第三方面，在一种可能的实现方式中，该第二指示信息还用于指示RLF的原因，该原因包括该第一用户设备连续未接收反馈信息的次数达到该第四阈值。在该方案中，第一用户设备可以向网络设备上报第二指示信息(例如，触发/检测到RLF的原因)和/或第三指示信息，说明目前资源冲突的概率很大，从而网络设备可以相应地调整某些参数，以降低资源冲突的概率，有利于提高通信质量、降低通信时延、保证通信的可靠性。
结合上述第三方面，在一种可能的实现方式中，第一用户设备触发/检测到RLF，可以让第一用户设备采取对应的策略，例如，重新恢复单播连接、或重建单播连接，有利于提高通信质量、降低通信时延、保证通信的可靠性。
结合上述第三方面，在一种可能的实现方式中，第一用户设备触发资源重选，可以让第一用户设备重新选择资源，有利于降低资源冲突/传输冲突的概率，，有利于提高通信质量、降低通信时延、保证通信的可靠性。
第四方面，提供了一种通信装置用于实现上述方法。该通信装置包括实现上述方法相应的模块、单元、或手段(means)，该模块、单元、或means可以通过硬件实现，软件实现，或者通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块或单元。
结合上述第四方面，在一种可能的实现方式中，该通信装置包括：收发模块和处理模块；该收发模块，用于通过侧行链路SL向第二用户设备发送第一数据；该处理模块，用于未接收第一反馈信息，将第二计数器的计数值增加1；其中，该第一反馈信息指示该第二用户设备是否成功接收该第一数据；该第二计数器用于统计该第一用户设备连续未接收反馈信息的次数。
结合上述第四方面，在一种可能的实现方式中，该收发模块，还用于接收该第一反馈信息，该处理模块，还用于将该第二计数器初始化。
结合上述第四方面，在一种可能的实现方式中，该处理模块，还用于将该第二计数器初始化包括：用于将该第二计数器初始化为0。
结合上述第四方面，在一种可能的实现方式中，该收发模块，还用于：该第二计数器 的计数值大于或等于第四阈值，向网络设备发送第二指示信息和/或第三指示信息，或者，该处理模块，用于触发资源重选。该第二指示信息用于指示该第一用户设备检测到RLF，或，用于指示发生了RLF，或，用于指示SL失败的原因为RLF。该第三指示信息用于指示第二计数器的计数值达到(或，大于或等于)第四阈值或第二计数器的计数值达到(或，小于或等于)0或第二取值，或，用于指示第一用户设备连续未接收反馈信息的次数达到预设阈值(例如，第四阈值)，或，用于指示反馈信息的接收和其他传输连续冲突的次数达到预设阈值(例如，第四阈值)。
结合上述第四方面，在一种可能的实现方式中，该第二指示信息还用于指示RLF的原因，该原因包括该第一用户设备连续未接收反馈信息的次数达到该第四阈值。
上述第四方面及第四方面中任一种可能的实现方式所带来的技术效果可参见上述第三方面及第三方面的不同实现方式所带来的技术效果，此处不再赘述。
第五方面，提供了一种通信装置，包括：处理器；该处理器用于与存储器耦合，并读取存储器中存储的计算机指令之后，根据该指令执行如上述任一方面所述的方法。
结合上述第五方面，在一种可能的实现方式中，通信装置还包括存储器；该存储器用于存储计算机指令。
结合上述第五方面，在一种可能的实现方式中，通信装置还包括通信接口；该通信接口用于该通信装置与其它设备进行通信。示例性的，该通信接口可以为收发器、输入/输出接口、接口电路、输出电路、输入电路、管脚或相关电路等。
结合上述第五方面，在一种可能的实现方式中，该通信装置可以是芯片或芯片系统。其中，当该通信装置是芯片系统时，该通信装置可以由芯片构成，也可以包含芯片和其他分立器件。
结合上述第五方面，在一种可能的实现方式中，当通信装置为芯片或芯片系统时，上述通信接口可以是该芯片或芯片系统上的输入/输出接口、接口电路、输出电路、输入电路、管脚或相关电路等。上述处理器也可以体现为处理电路或逻辑电路。
第六方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机可以执行上述任一方面所述的方法。
第七方面，提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述任一方面所述的方法。
其中，第五方面至第六方面中任一种可能的实现方式所带来的技术效果可参见上述第一方面及第三方面的不同实现方式所带来的技术效果，此处不再赘述。
附图说明
图1为现有技术中发送端使用并行的HARQ进程发送数据的示意图；
图2为现有技术中基于HARQ的SL RLF检测过程的示意图；
图3为本申请实施例提供的一种通信系统的架构示意图；
图4为本实施例提供的一种通信装置的结构示意图；
图5为本申请实施例提供的一种移动终端的结构示意图；
图6a为本申请实施例提供的一种通信方法的流程图；
图6b为本申请实施例提供的另一种通信方法的流程图；
图7为现有技术中基于HARQ的SL RLF检测过程以及本申请实施例提供的通信方法用 于RLF检测过程的示意图；
图8为本申请实施例提供的又一种通信方法的流程图；
图9为本实施例提供的另一种通信装置的结构示意图。
具体实施方式
为了方便理解本申请实施例的技术方案，首先给出本申请相关技术或名词的简要介绍如下。
第一，车联网(vehicle to everything，V2X)
在V2X通信中，终端设备与其他终端设备之间进行直连通信的通信链路可以被称为侧行链路或者边链路(sidelink，SL)。从终端设备到网络设备的无线通信链路可以被称为上行链路(uplink，UL)；从网络设备到终端设备的无线通信链路可以被称为下行链路(downlink，DL)。由于UL或DL接口可以称之为Uu口，所以UL或者DL可以称之为Uu口链路。
NR V2X中支持单播、组播和广播业务。
需要说明的是，本申请中的终端、终端设备、用户设备、UE之间可以相互替换。
第二，混合自动重传请求(hybrid automatic repeat request,HARQ)
1)HARQ反馈：
一种可能的HARQ反馈机制为：接收端接收数据成功，向发送端反馈肯定确认(acknowledgement，ACK)；若接收端接收数据失败，向发送端反馈否定确认(negative acknowledgement，NACK)。
在NR V2X中，对于单播和组播支持SL HARQ反馈。
2)HARQ进程：
HARQ采用停等协议来控制数据的发送。具体地，发送端发送一个传输块(transport block，TB)后，就停下来等待，直到接收到该TB的反馈信息，才进行下一个TB的发送。发送端停止发送，等待反馈信息的过程，会导致吞吐量降低。
为了提高吞吐量，发送端可以使用多个并行的HARQ进程。也就是说，当发送端在等待一个HARQ进程的反馈信息时，可以使用另一个HARQ进程来继续发送数据。示例性地，如图1所示，发送端使用第1个HARQ进程来发送TB1，在T1时刻，TB1的发送完成。发送端等待TB1的反馈信息，直到在T2时刻，发送端接收到TB1的反馈信息。在等待的时间段T1至T2之间，发送端可以采用第2个HARQ进程发送TB2。类似地，发送端在T2时刻完成TB2的发送之后，等待TB2的反馈信息，直到在T3时刻，发送端接收到TB2的反馈信息。在等待的时间段T2至T3之间，发送端可以采用第3个HARQ进程发送TB3。
需要说明的是，Uu口上的HARQ进程可以称为HARQ进程。在UU口，一个HARQ进程可以通过一个HARQ进程标识(process identity,process ID)来标识，或者说，一个HARQ进程可以与一个HARQ process ID相关联。
需要说明的是，在NR V2X中，SL上的HARQ进程可以称为SL进程。
第三，SL进程
在SL上，发送端用户设备(user equipment，UE)可以向一个或多个接收端UE发送侧行链路控制信息(sidelink control information，SCI)和SL数据。其中，SCI用于调度SL数据。
在NR V2X中，SCI可以包括第一级SCI和第二级SCI。
由于SL数据通过物理侧行链路共享信道(physical sidelink shared channel，PSSCH)传输，因此，SL数据也可以被称为PSSCH，在此统一说明，以下不再赘述。下面分别对第一级SCI和第二级SCI进行阐述。
第一级SCI可以用于调度第二级SCI和SL数据/PSSCH。第一级SCI可以通过物理侧行链路控制信道(physical sidelink control channel，PSCCH)传输。
第二级SCI可以用于解码SL数据/PSSCH。
SCI或第二级SCI可以包括SL process ID、第一目的ID(destination ID)、第一源ID(source ID)和通信类型(cast type)。
在NR V2X中，一组ID集合可以标识一个SL进程，或者，一个SL进程可以和一组ID集合相关联。
ID集合可以包括SL process ID、第一目的ID、第一源ID和通信类型，或，ID集合可以包括SL process ID、第一目的ID和第一源ID，或，ID集合可以包括SL process ID、第二目的ID、第二源ID和通信类型，或，ID集合可以包括SL process ID、第二目的ID和第二源ID。
下面分别对SL process ID、第一目的ID、第二目的ID、第一源ID、第二源ID和通信类型进行阐述。
1)SL process ID
SL process ID可以用于标识SL进程。
2)第一目的ID和第二目的ID
第一目的ID可用于标识SCI调度的SL数据的目的(target)。可选的，第一目的ID可以用于接收端UE的物理层进行数据包的过滤。示例性地，第一目的ID可以为目的层1 ID(destination layer-1 ID)。例如，层1可以表示开放式系统互联通信参考模型(open system interconnection reference model，OSI模型)中的第一层——物理层。
示例性地，第一目的ID可以为第二目的ID的部分比特位。例如，若第二目的ID为24比特，那么，第一目的ID可以为第二目的ID的低16位。
第二目的ID可以用于标识数据的目的(例如，target)/接收端/接收终端。示例性的，第二目的ID可以用于标识一个组播或广播业务。示例性的，第二目的ID可以为目的/接收端/接收终端的标识。示例性的，第二目的ID可以为目的层2 ID(Destination Layer-2 ID)。可选的，第二目的ID可以用于接收终端的媒体接入控制(media access contoll,MAC)层进行数据包过滤。例如，层2表示OSI模块中的第二层——数据链路层，数据链路层包含MAC层。
3)第一源ID和第二源ID
第一源ID可用于标识SCI调度的SL数据的源(source)。可选的，第一源ID可以用于接收终端的PHY层进行数据包过滤。示例性地，第一源ID可以为源层1 ID(source layer-1 ID)。
示例性地，第一源ID可以为第二源ID的部分比特位。例如，若第二源ID为24比特，那么，第一源ID可以为第二源ID的低8位。第二源ID可用于标识数据的源或发送端。示例性地，第二源ID可以为源层2 ID(source layer-2 ID)。
4)通信类型
通信类型可以包括单播、组播、广播中的任一个或多个。SCI中的通信类型用于指示当前的通信为单播、组播或广播；或者，SCI中的通信类型用于指示该SCI调度的SL数据为单播数据、组播数据或广播数据。
例如，第二源ID和第二目的ID对可以标识一个单播。
示例性的，对于单播，接收端UE的MAC层进行数据包的过滤时，可以使用第二目的ID和第二源ID。
示例性的，对于单播，接收端UE的物理层进行数据包的过滤时，可以使用第一目的ID和第一源ID。
第四，物理侧行链路反馈信道(physical sidelink feedback channel，PSFCH)的接收与其他传输/接收冲突
示例性地，下面介绍三种PSFCH的接收与其他传输/接收冲突的情况。
例如，冲突可以包括：在时域上冲突，或，在一个时隙(slot)内冲突。
例如，冲突可以理解/替换为overlap或重叠。
其中，PSFCH的接收与SCI1和/或SL数据1相关联。可以理解的是，发送端UE向接收端UE发送SCI1和/或SL数据1后，发送端UE可能在PSFCH资源1上接收接收端UE的SL HARQ反馈(可以理解为PSFCH的接收)。
1)PSFCH的接收与PSFCH的发送冲突
PSFCH的接收(针对SL数据1的传输)与PSFCH的发送(与其他的数据传输相关联)冲突，如果PSFCH的接收的优先级低于或等于PSFCH的发送的优先级(或者说，PSFCH的接收没有被优先)，那么，SL数据1的发送端UE执行PSFCH的发送，而不执行PSFCH的接收，从而SL数据1的发送端UE未接收到PSFCH。
需要说明的是，SL数据1的发送端UE也可以作为SL数据2的接收端UE，从而向SL数据2的发送端UE发送PSFCH。
需要说明的是，PSFCH的接收或发送的优先级，是由PSFCH关联的SL数据的优先级决定的。其中，与SL数据对应的SCI或者第一级SCI中的优先级(priority)字段(field)携带有SL数据的优先级信息，优先级字段的值越小，表示SL数据的优先级越高。
2)PSFCH的接收与UL传输冲突
PSFCH的接收(针对SL数据1的传输)与UL传输冲突，如果PSFCH的接收的优先级低于或等于UL传输的优先级(或者说，PSFCH的接收没有被优先)，那么，发送端UE执行UL传输，而不执行PSFCH的接收，从而发送端UE未接收到PSFCH。其中，“传输”可以理解为“发送和/或接收”。
例如，PSFCH的接收(针对SL数据1的传输)与UL传输冲突可以包括：PSFCH的接收(针对SL数据1的传输)与UL传输在一个时隙内冲突。需要说明的是，一种可能的实现，一个时隙内PSFCH的接收的优先级可以为该时隙内多个PSFCH对应的SL数据的优先级中最高的优先级。
3)NR SL PSFCH的接收与长期演进(long term evolution，LTE)SL传输冲突
NR SL传输中，在发送端UE，PSFCH的接收与LTE SL传输在时间上冲突，如果PSFCH的接收的优先级低于或等于LTE SL传输的优先级(或者说，PSFCH的接收没有被优先)， 那么，发送端UE执行LTE SL传输，而不执行PSFCH的接收，从而发送端UE未接收到PSFCH。
需要说明的是，PSFCH的接收或发送的优先级，是由PSFCH关联的SL数据的优先级决定的。其中，与SL数据对应的SCI或者第一级SCI中的优先级(priority)字段(field)携带有SL数据的优先级信息，优先级字段的值越小，表示SL数据的优先级越高。
需要说明的是，NR系统中和LTE系统中定义了不同的优先级等级。关于上述两个系统中传输的优先级比较，可参考现有技术，在此不再赘述。
需要说明的是，上述冲突可以理解为：一个UE(发送端UE)内的冲突。
需要说明的是，发送端可以理解为：数据的发送端。
需要说明的是，上述冲突情况及其冲突情况下的优先级比较是现有技术，在此不再赘述，具体内容可以参考3GPP TS 38.213:"NR；Physical Layer Procedures for control"和3GPP TS 38.321:"NR；Medium Access Control(MAC)protocol specification"中的描述，此处不再赘述。
第五，基于HARQ的SL无线链路失败(radio link failure，RLF)检测
在NR V2X中，针对单播连接，引入了基于HARQ的SL RLF检测。发送端UE使用计数器统计连续未接收到PFSCH的次数。具体地，若发送端UE未接收到PSFCH，发送端将计数器的计数值增加1；若发送端UE接收到PSFCH，发送端UE将计数器的计数值初始化/置为0。若计数器的计数值达到阈值，发送端UE触发RLF。具体内容可以参考3GPP TS 38.321:"NR；Medium Access Control(MAC)protocol specification的5.22.1.3.3节。
单播连接建立，或阈值被配置或重配置，发送端UE将计数器的计数值初始化/置为0。
其中，该计数器可以为numConsecutiveDTX，该阈值可以为sl-maxNumConsecutiveDTX，该阈值的取值是由网络设备配置的，或者，该阈值的取值是预先配置的。
示例性地，图2示出了基于HARQ的SL RLF检测过程。其中，计数器的初始值为0，触发RLF的阈值为3。例如，PSFCH监听时机可以理解为PSFCH或PSFCH所在的位置或PSFCH所在的时域位置或PSFCH接收时机。需要说明的是，图2中仅示意性地画出11个PSFCH监听时机，实际的PSFCH监听时机在时域上可能是连续的也可能不是连续的，不同的PSFCH监听时机在时域上还可能是重叠的，本申请实施例对此不作任何限定。
其中，发送端UE“接收”PSFCH，表示发送端UE执行“接收”PSFCH的动作。发送端UE“接收”PSFCH的结果可能为发送端UE“接收到”PSFCH，或者，还可能为发送端UE“未接收到”PSFCH。
发送端UE“未接收”PSFCH，表示发送端UE未执行“接收”的动作。当发送端UE“接收”PSFCH与发送端UE的其他传输/接收冲突时，由于“接收”PSFCH的优先级低于其他传输/接收的优先级(或者说，“接收”PSFCH没有被优先)，发送端UE执行其他传输/接收，而未执行“接收”PSFCH的动作。发送端UE“未接收”PSFCH的结果为发送端UE“未接收到”PSFCH。
在第1个PSFCH监听时机，由于PSFCH的接收与其他传输冲突且PSFCH的接收没有被优先，发送端UE未接收PSFCH。从而，发送端UE未接收到PSFCH。现有协议中计数器的计数值增加1，由初始值0变成1。
在第2个PSFCH监听时机，发送端UE接收PSFCH，但未接收到PSFCH。现有协议中计数器的计数值增加1，变成2。
在第3个PSFCH监听时机，发送端UE接收到PSFCH。现有协议中计数器的计数值被初始化/置为0。
在第4个PSFCH监听时机，发送端UE接收PSFCH，但未接收到PSFCH。现有协议中计数器的计数值增加1，变成1。
在第5个PSFCH监听时机，发送端UE接收PSFCH，但未接收到PSFCH。现有协议中计数器的计数值增加1，变成2。
在第6个PSFCH监听时机，由于PSFCH的接收与其他传输冲突且PSFCH的接收没有被优先，发送端UE未接收PSFCH，从而，发送端UE未接收到PSFCH。现有协议中计数器的计数值增加1，变成3。由于现有协议中计数器的计数值达到阈值，因此，发送端UE触发RLF。
在第7个PSFCH监听时机，发送端UE接收到PSFCH。现有协议中计数器的计数值被初始化/置为0。
在第8个PSFCH监听时机，由于PSFCH的接收与其他传输冲突且PSFCH的接收没有被优先，发送端UE未接收PSFCH。从而，发送端UE未接收到PSFCH。现有协议中计数器的计数值增加1，由初始值0变成1。
在第9个PSFCH监听时机，由于PSFCH的接收与其他传输冲突且PSFCH的接收没有被优先，发送端UE未接收PSFCH。从而，发送端UE未接收到PSFCH。现有协议中计数器的计数值增加1，变成2。
在第10个PSFCH监听时机，发送端UE接收到PSFCH。现有协议中计数器的计数值被初始化/置为0。
在第11个PSFCH监听时机，发送端UE接收到PSFCH。现有协议中计数器的计数值被初始化/置为0，或者说，第一计数器的计数值不变，仍然为0。
需要理解的是，图2中第7个PSFCH监听时机及之后的PSFCH监听时机可能是单播连接恢复后进行的SL传输对应的PSFCH。可以理解的是，如果触发RLF后，为恢复该单播连接，图2中第7个PSFCH监听时机及之后的PSFCH监听时机可能不存在。
根据上述分析可知，在第5个PSFCH监听时机，计数器的计数值为2。在第6个PSFCH监听时机，由于发送端UE未接收PSFCH导致发送端UE未接收到PSFCH，而并非由于无线链路存在问题导致发送端UE未接收到PSFCH。现有基于HARQ的SL RLF检测中，在第6个PSFCH监听时机，计数器的计数值会增加1，从而导致计数器的计数值达到阈值3，进而导致发送端UE误触发RLF，进而也会增加通信时延、降低通信的质量或可靠性。尤其当阈值为1时，使用现有的基于HARQ的SL RLF检测，发送端UE更容易误触发RLF。
需要说明的是，目前，在NR V2X中，基于HARQ的SL RLF检测是针对单播连接执行的，计数器也是针对每个单播连接单独维护的。这里，可以将连续未接收到PSFCH的次数理解为：针对单播连接(例如，一个单播连接)，连续未接收到PSFCH的次数，或，针对单播连接(例如，一个单播连接)的所有sidelink进程，连续未接收到PSFCH的次数。
单播连接还可以被称为SL的无线资源控制(radio resource control，RRC)连接，或者，PC5-RRC连接。单播连接可以为一对第二源ID和第二目的ID之间的逻辑连接；或者，单播连接可以为在接入层(access-stratum，AS)层，一对第二源ID和第二目的ID之间的逻辑连接。单播连接可以包括/替换为/对应于以下任一项或多项：单播、单播连接、 目的地址、第二源ID和第二目的ID对(pair)。其中，目的地址(destination)可以理解为对应的第二源ID和第二目的ID对。
示例性地，本申请中的RLF可以包括/理解为SLRLF。
示例性的，本申请中的初始化可以包括/替换为：重新初始化。
示例性的，本申请中的第一用户设备可以包括/替换为：第一用户设备的HARQ实体，或，第一用户设备的SLHARQ实体，或，第一用户设备的MAC实体。
示例性的，本申请中的针对单播连接可以包括/替换为：针对一个单播连接，或，针对第一单播连接。
示例性的，本申请中的单播连接关联的SL进程可以包括/替换为以下任一项或多项：与目的地址关联的SL进程，与第二源ID和第二目的ID对关联的SL进程，与第一源ID和第一目的ID对关联的SL进程。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。其中，在本申请的描述中，除非另有说明，“/”表示前后关联的对象是一种“或”的关系，例如，A/B可以表示A或B；本申请中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况，其中A，B可以是单数或者复数。并且，在本申请的描述中，除非另有说明，“多个”是指两个或多于两个。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的至少一项(个)，可以表示：a，b，c，a-b，a-c，b-c，或a-b-c，其中a，b，c可以是单个，也可以是多个。另外，为了便于清楚描述本申请实施例的技术方案，在本申请的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
需要说明的是，本申请中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其他实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
本申请实施例提供的方法可适用但不限于如下领域：设备到设备(device to device，D2D)、V2X、无人驾驶(unmanned driving)、自动驾驶(automated driving，ADS)、辅助驾驶(driver assistance，ADAS)、智能驾驶(intelligent driving)、网联驾驶(connected driving)、智能网联驾驶(intelligent network driving)、汽车共享(car sharing)等。
本申请实施例中的通信系统包括但不限于长期演进(long term evolution，LTE)系统、第五代(5th-generation，5G)系统、新无线(new radio，NR)系统，无线局域网(wireless local area networks，WLAN)系统以及未来演进系统或者多种通信融合系统。其中，5G系统可以为非独立组网(non-standalone，NSA)的5G系统或独立组网(standalone，SA)的5G系统。
本申请实施例中的网络设备为网络侧的一种用于发送信号，或者，接收信号，或者，发送信号和接收信号的实体。网络设备可以为部署在无线接入网(radio access network， RAN)中为终端提供无线通信功能的装置，例如可以为传输接收点(transmission reception point，TRP)、基站、各种形式的控制节点(例如，网络控制器、无线控制器(例如，云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器))等。具体的，网络设备可以为各种形式的宏基站，微基站(也称为小站)，中继站，接入点(access point，AP)等，也可以为基站的天线面板。所述控制节点可以连接多个基站，并为所述多个基站覆盖下的多个终端配置资源。在采用不同的无线接入技术的系统中，具备基站功能的设备的名称可能会有所不同。例如，LTE系统中可以称为演进型基站(evolved NodeB，eNB或eNodeB)，5G系统或NR系统中可以称为下一代基站节点(next generation node base station，gNB)，本申请对基站的具体名称不作限定。网络设备还可以是未来演进的公共陆地移动网络(public land mobile network，PLMN)中的网络设备等。
本申请实施例中的终端是用户侧的一种用于接收信号，或者，发送信号，或者，接收信号和发送信号的实体。终端用于向用户提供语音服务和数据连通性服务中的一种或多种。终端还可以称为用户设备(user equipment，UE)、终端设备、接入终端、用户单元、用户站、移动站、远方站、远程终端、移动设备、用户终端、无线通信设备、用户代理或用户装置。终端可以是V2X设备，例如，智能汽车(smart car或intelligent car)、数字汽车(digital car)、无人汽车(unmanned car或driverless car或pilotless car或automobile)、自动汽车(self-driving car或autonomous car)、纯电动汽车(pure EV或Battery EV)、混合动力汽车(hybrid electric vehicle，HEV)、增程式电动汽车(range extended EV，REEV)、插电式混合动力汽车(plug-in HEV，PHEV)、新能源汽车(new energy vehicle)、路边装置(road site unit，RSU)。终端也可以是D2D设备，例如，电表、水表等。终端还可以是移动站(mobile station，MS)、用户单元(subscriber unit)、无人机、物联网(internet of things，IoT)设备、WLAN中的站点(station，ST)、蜂窝电话(cellular phone)、智能电话(smart phone)、无绳电话、无线数据卡、平板型电脑、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)设备、膝上型电脑(laptop computer)、机器类型通信(machine type communication，MTC)终端、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备(也可以称为穿戴式智能设备)。终端还可以为下一代通信系统中的终端，例如，5G系统中的终端或者未来演进的PLMN中的终端，NR系统中的终端等。
本申请实施例适用于NR系统，也可以适用于其他系统，例如，其他面向未来的新系统等，本申请实施例对此不作具体限定。此外，术语“系统”可以和“网络”相互替换。
如图3所示，为本申请实施例提供的一种通信系统30。该通信系统30包括一个或多个用户设备301。其中，不同的用户设备301之间可以通过SL相互通信。
示例性地，本申请实施例中的第一用户设备可以为相互通信的任意两个用户设备301中的其中一个，另外一个可以为本申请实施例中的第二用户设备。
可选地，该通信系统还包括网络设备302。其中，该网络设备302可以通过UL或DL分别与用户设备301进行通信。例如在广播场景下，某个用户设备301为确保有业务的非连续接收(discontinuous reception，DRX)需求的其他终端装置能够接收到广播信号，可以向网络设备302发送相关的请求信息，本申请实施例对此不做具体限定。
需要说明的是，图3仅是示意图，虽然未示出，但是该通信系统30中还可以包括其它网络设备，如该通信系统30还可以包括核心网设备、无线中继设备和无线回传设备中的一个或多个，在此不做具体限定。其中，网络设备可以通过无线或有线方式与核心网设备连接。核心网设备与网络设备302可以是独立的不同的物理设备，也可以是将核心网设备的功能与网络设备302的逻辑功能集成在同一个物理设备上，还可以是一个物理设备上集成了部分核心网设备的功能和部分的网络设备302的功能，本申请实施例对此不做具体限定。
可选的，本申请实施例中的网络设备302，是一种将用户设备301接入到无线网络的设备，可以是基站(base station)、演进型基站(evolved NodeB，eNodeB)、发送接收点(transmission reception point，TRP)、5G移动通信系统中的下一代基站(next generation NodeB，gNB)、未来移动通信系统中的基站或无线保真(wireless-fidelity，Wi-Fi)系统中的接入节点等；也可以是完成基站部分功能的模块或单元，例如，可以是集中式单元(central unit，CU)，也可以是分布式单元(distributed unit，DU)。本申请的实施例对网络设备所采用的具体技术和具体设备形态不做限定。在本申请中，如果无特殊说明，网络设备均指无线接入网设备。
可选的，本申请实施例中的用户设备301可以是车辆(vehicle)，也可以是安装在车辆上用于辅助车辆行驶的车载终端，或者车载终端内的芯片。或者，本申请实施例中的用户设备301可以是用于实现无线通信功能的设备，例如终端或者可用于终端中的芯片等。其中，上述车载终端或终端可以是5G网络或者未来演进的公共陆地移动网络(public land mobile network，PLMN)中的UE、接入终端、终端单元、终端站、移动站、移动台、远方站、远程终端、移动设备、无线通信设备、终端代理或UE等。接入终端可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备或可穿戴设备，虚拟现实(virtual reality，VR)UE、增强现实(augmented reality，AR)UE、工业控制(industrial control)中的无线终端或无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等。用户设备301可以是固定位置的，也可以是可移动的，本申请实施例对此不做具体限定。
可选的，在本申请实施例中，用户设备301包括硬件层、运行在硬件层之上的操作系统层，以及运行在操作系统层上的应用层。该硬件层包括中央处理器(central processing unit，CPU)、内存管理单元(memory management unit，MMU)和内存(也称为主存)等硬件。该操作系统可以是任意一种或多种通过进程(process)实现业务处理的计算机操作系统，例如，Linux操作系统、Unix操作系统、Android操作系统、iOS操作系统或windows操作系统等。该应用层包含浏览器、通讯录、文字处理软件、即时通信软件等应用。并且，本申请实施例并未对本申请实施例提供的方法的执行主体的具体结构特别限定，只要能够通过运行记录有本申请实施例的提供的方法的代码的程序，以根据本申请实施例提供的方法进行通信即可。例如，本申请实施例提供的方法的执行主体可以是用户设备301，或者， 是用户设备301中能够调用程序并执行程序的功能模块。
换言之，本申请实施例中的用户设备301的相关功能可以由一个设备实现，也可以由多个设备共同实现，还可以是由一个设备内的一个或多个功能模块实现，本申请实施例对此不作具体限定。可以理解的是，上述功能既可以是硬件设备中的网络元件，也可以是在专用硬件上运行的软件功能，或者是硬件与软件的结合，或者是平台(例如，云平台)上实例化的虚拟化功能。
例如，本申请实施例中的用户设备301的相关功能可以通过图4中的通信装置40来实现。图4所示为本申请实施例提供的通信装置40的结构示意图。该通信装置40包括一个或多个处理器401，通信线路402，以及至少一个通信接口(图4中仅是示例性的以包括通信接口404，以及一个处理器401为例进行说明)，可选的还可以包括存储器403。
处理器401可以是一个CPU，微处理器，特定应用集成电路(application-specific integrated circuit，ASIC)，或一个或多个用于控制本申请方案程序执行的集成电路。
通信线路402可包括一通路，用于连接不同组件之间。
通信接口404，可以是收发模块用于与其他设备或通信网络通信，如以太网，RAN，无线局域网(wireless local area networks，WLAN)等。例如，所述收发模块可以是收发器、收发机一类的装置。可选的，所述通信接口404也可以是位于处理器401内的收发电路，用以实现处理器的信号输入和信号输出。
存储器403可以是具有存储功能的装置。例如可以是只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。存储器可以是独立存在，通过通信线路402与处理器相连接。存储器也可以和处理器集成在一起。
其中，存储器403用于存储执行本申请方案的计算机执行指令，并由处理器401来控制执行。处理器401用于执行存储器403中存储的计算机执行指令，从而实现本申请实施例中提供的通信方法。
或者，本申请实施例中，也可以是处理器401执行本申请下述实施例提供的通信方法中的处理相关的功能，通信接口404负责与其他设备或通信网络通信，本申请实施例对此不作具体限定。
本申请实施例中的计算机执行指令也可以称之为应用程序代码，本申请实施例对此不作具体限定。
在具体实现中，作为一种实施例，处理器401可以包括一个或多个CPU，例如图4中的CPU0和CPU1。
在具体实现中，作为一种实施例，通信装置40可以包括多个处理器，例如图4中的处理器401和处理器407。这些处理器中的每一个可以是一个单核(single-CPU)处理器，也可以是一个多核(multi-CPU)处理器。这里的处理器可以指一个或多个设备、电路、 和/或用于处理数据(例如计算机程序指令)的处理核。
在具体实现中，作为一种实施例，通信装置40还可以包括输出设备405和输入设备406。输出设备405和处理器401通信，可以以多种方式来显示信息。
上述的通信装置40可以是一个通用装置或者是一个专用装置。例如通信装置40可以是台式机、便携式电脑、网络服务器、掌上电脑(personal digital assistant，PDA)、移动手机、平板电脑、无线终端装置、车载终端装置、嵌入式设备或具有图4中类似结构的设备。本申请实施例不限定通信装置40的类型。
以图3中的用户设备301为移动终端为例，图5示出了该移动终端50的结构示意图。
如图5所示，移动终端50可以包括处理器510，外部存储器接口520，内部存储器521，USB接口530，移动通信模块540，无线通信模块550，音频模块560，传感器模块570，摄像头580以及显示屏581等。
可以理解的是，本申请实施例示意的结构并不构成对移动终端50的具体限定。在本申请另一些实施例中，移动终端50可以包括比图示更多或更少的部件，或者组合某些部件，或者拆分某些部件，或者不同的部件布置。图示的部件可以以硬件，软件或软件和硬件的组合实现。
本申请实施例中，处理器510可以包括一个或多个处理单元，例如：处理器510可以包括应用处理器(application processor，AP)，调制解调处理器，图形处理器(graphics processing unit，GPU)，图像信号处理器(image signal processor，ISP)，控制器，存储器，视频编解码器，数字信号处理器(digital signal processor，DSP)，基带处理器，和/或神经网络处理器(neural-network processing unit，NPU)等。其中，不同的处理单元可以是独立的器件，也可以集成在一个或多个处理器中。
此外，处理器510中还可以设置存储器，用于存储指令和数据。在一些实施例中，处理器510中的存储器为高速缓冲存储器。该存储器可以保存处理器510刚用过或循环使用的指令或数据。如果处理器510需要再次使用该指令或数据，可从所述存储器中直接调用。避免了重复存取，减少了处理器510的等待时间，因而提高了系统的效率。
本申请实施例中，移动终端50的无线通信功能可以通过天线1，天线2，移动通信模块540，无线通信模块550，调制解调处理器以及基带处理器等实现。
天线1和天线2用于发射和接收电磁波信号。
移动通信模块540可以提供应用在移动终端50上的包括第二代(2rd generation，2G)/第三代(3th generation，3G)/第四代(4th generation，4G)/第五代(5th generation，5G)等无线通信的解决方案。在一些实施例中，移动通信模块540的至少部分功能模块可以被设置于处理器510中。在一些实施例中，移动通信模块540的至少部分功能模块可以与处理器510的至少部分模块被设置在同一个器件中。
无线通信模块550可以提供应用在移动终端50上的包括WLAN(如蓝牙(bluetooth，BT)，无线保真(wireless fidelity，WiFi)网络)，全球导航卫星系统(global navigation satellite system，GNSS)，近距离无线通信技术(near field communication，NFC)，红外技术(infrared，IR)或者调频(frequency modulation，FM)等无线通信的解决方案。
在一些实施例中，移动终端50的天线1和移动通信模块540耦合，天线2和无线通信模块550耦合，使得移动终端50可以通过无线通信技术与网络以及其他设备通信。
本申请实施例中，移动终端50通过GPU，显示屏581，以及应用处理器等实现显示功能。GPU为图像处理的微处理器，连接显示屏581和应用处理器。GPU用于执行数学和几何计算，用于图形渲染。处理器510可包括一个或多个GPU，其执行程序指令以生成或改变显示信息。
显示屏581用于显示图像或者视频等。显示屏581包括显示面板。显示面板可以采用液晶显示屏(liquid crystal display，LCD)，有机发光二极管(organic light-emitting diode，OLED)，有源矩阵有机发光二极体或主动矩阵有机发光二极体(active-matrix organic light emitting diode的，AMOLED)，柔性发光二极管(flex light-emitting diode，FLED)，Miniled，MicroLed，Micro-oLed或者量子点发光二极管(quantum dot light emitting diodes，QLED)等。在一些实施例中，移动终端50可以包括1个或N个显示屏581，N为大于1的正整数。
本申请实施例中，移动终端50可以通过ISP，摄像头580，视频编解码器，GPU，显示屏581以及应用处理器等实现拍摄功能。
摄像头580用于捕获静态图像或视频。物体通过镜头生成光学图像投射到感光元件。感光元件可以是电荷耦合器件(charge coupled device，CCD)或互补金属氧化物半导体(complementary metal-oxide-semiconductor，CMOS)光电晶体管。感光元件把光信号转换成电信号，之后将电信号传递给ISP转换成数字图像信号。ISP将数字图像信号输出到DSP加工处理。DSP将数字图像信号转换成标准的RGB，YUV等格式的图像信号。在一些实施例中，移动终端50可以包括1个或N个摄像头580，N为大于1的正整数。
本申请实施例中，外部存储器接口520可以用于连接外部存储卡，例如Micro SD卡，实现扩展移动终端50的存储能力。外部存储卡通过外部存储器接口520与处理器510通信，实现数据存储功能。例如将音乐，视频等文件保存在外部存储卡中。
本申请实施例中，内部存储器521可以用于存储计算机可执行程序代码，所述可执行程序代码包括指令。内部存储器521可以包括存储程序区和存储数据区。其中，存储程序区可存储操作系统，至少一个功能所需的应用程序(比如声音播放功能，图像播放功能等)等。存储数据区可存储移动终端50使用过程中所创建的数据(比如音频数据，电话本等)等。此外，内部存储器521可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件，闪存器件，通用闪存存储器(universal flash storage，UFS)等。处理器510通过运行存储在内部存储器521的指令，和/或存储在设置于处理器中的存储器的指令，执行移动终端50的各种功能应用以及数据处理。
本申请实施例中，传感器模块570可以包括加速度传感器、陀螺仪传感器、GPS传感器以及触摸传感器等。
当然，移动终端50还可以包括充电管理模块、电源管理模块、电池、按键、指示器以及1个或多个用户标识模块(subscriber identity module，SIM)卡接口等，本申请实施例对此不做任何限制。
现有技术中，当发送端接收PSFCH的时间与发送端发送或接收其他信息的时间冲突时，如果发送端发送或接收其他信息的优先级高于接收PSFCH的优先级，则发送端执行其他信息的发送或接收，从而无法接收到PSFCH。显然，这并非由于无线链路存在问题导致发送端未接收到PSFCH。但是，由于该情况下发送端也未接收到PSFCH，发送端仍然会将计数 器的计数值增加1，从而可能导致计数器的计数值达到预设阈值，进而将导致发送端误触发RLF，影响通信质量，带来通信时延，影响通信质量。
可以理解的是，根据现有协议中的内容，若误触发了RLF，发送端和接收端之间可能需要一定的时间来恢复/重建连接(例如，单播连接)才能继续正常通信，可以理解的是误触发RLF将会带来了一定的通信时延，也会影响通信的质量。
下面以第一用户设备为相互通信的任意两个用户设备301中的其中一个为例，结合图1至图5对本申请实施例提供的通信方法进行具体阐述。
应理解，下文所描述的方法实施例中仅以执行主体为第一用户设备和第二用户设备为例，但并不限定其一定为第一用户设备和第二用户设备，第一用户设备和第二用户设备可替换为能实现该申请中方法的设备。例如，第一用户设备还可以替换为配置于第一用户设备中的芯片或第一设备，第二用户设备也可以替换为配置于第二用户设备中的芯片或第二设备。
如图6a所示，为本申请实施例提供的一种通信方法，该通信方法包括如下步骤：
S601、第一用户设备通过SL向第二用户设备发送第一数据。
可选的，步骤S601可以包括/替换为：针对单播连接，第一用户设备通过SL向第二用户设备发送第一数据。
示例性地，第一数据可以为SL数据。
可选的，步骤S601可以替换为：第一用户设备通过SL向第二用户设备发送第一控制信息，或，第一用户设备通过SL向第二用户设备发送第一控制信息和第一数据。
其中，第一控制信息用于调度第一数据。
例如，第一控制信息可以为SCI，或，第一级SCI。
可以理解的是，第一用户设备通过SL可能仅向第二用户设备发送了第一控制信息，也可能向第二用户设备既发送了第一控制信息又发送了第一数据。例如，第一用户设备通过SL向第二用户设备发送了第一控制信息，但是可能由于一些原因(例如，由于第一数据的发送与其他的传输冲突)未能发送第一数据。
需要说明的是，本申请中的方案还可以适用于除SL之外的其他场景/系统，将步骤S601中的“通过SL”删除(即，不限定发送第一数据和/或第一控制信息的链路)，将第一用户设备、第二用户设备替换为第一设备、第二设备进行理解即可。
在步骤S601之后，第一用户设备可以执行以下步骤S602、S603、S604中的任一项或多项。
S602、第一用户设备未接收第一反馈信息，第一用户设备将第一计数器初始化，或者，第一计数器的计数值不变。
可选的，步骤S602可以包括/替换为：针对单播连接，第一用户设备未接收第一反馈信息，第一用户设备将第一计数器初始化，或者，第一计数器的计数值不变。
其中，第一反馈信息可以指示第二用户设备是否成功接收第一数据。
其中，第一计数器可以用于RLF检测。
需要说明的是，第一计数器可以和现有协议中的用于RLF检测的计数器(例如，numConsecutiveDTX)相同，也可以不同。例如，第一计数器为numConsecutiveDTX。
可选的，第一数据、第一控制信息、第一反馈信息、第一反馈资源、第一计数器、第 一指示信息、PSFCH监听时机、RLF中的任一项或多项与单播连接(例如，一个单播连接，或，第一单播连接)和/或SL的RRC连接(例如，一个SL的RRC连接，或，第一SL的RRC连接)相关联。
可选的，可以理解的是，本申请实施例提供的通信方法可以是针对单播连接(例如，一个单播连接)执行的，或者，本申请实施例提供的通信方法可以是针对一个单播连接关联的SL进程(例如，所有SL进程)执行的。
在本申请实施例中，“接收”与“接收到”的含义不同。具体地，“接收”是指执行接收的动作，“接收”的结果可能为“接收到”或者“未接收到”；“未接收”是指没有执行接收的动作，“未接收”的结果为“未接收到”。也就是说，“未接收到”包含两种情形，一是执行接收的动作但未接收到，二是没有执行接收的动作。在此统一说明，以下不再赘述。
可选地，第一反馈信息在第一反馈资源上传输。例如，第一反馈资源可以为PSFCH资源。
示例性地，本申请实施例中的第一反馈信息可以为ACK/NACK信息。
例如，第一反馈信息为ACK，指示第二用户设备成功接收第一数据。
例如，第一反馈信息为NACK，指示第二用户设备未成功接收第一数据。
可选地，第一反馈信息在表述上也可以替换为PSFCH。
在一种可能的实现方式中，第一用户设备将第一计数器初始化包括：第一用户设备将第一计数器的计数值初始化为0或第一取值。在该实现方式中，第一计数器的初始值为0或第一取值，触发RLF的计数值为预设阈值(例如，第三阈值)。可以理解的是，第一计数器的计数值达到(或，大于或等于)预设阈值(例如，第三阈值)将/会触发RLF。
示例性的，第一取值可以为整数。例如，第一取值可以为1等，本申请不限定。
需要说明的是，第三阈值可以和现有协议中的用于RLF检测的阈值(例如，sl-maxNumConsecutiveDTX)相同，也可以不同。例如，第三阈值为sl-maxNumConsecutiveDTX。
在另一种可能的实现方式中，第一用户设备还可以将第一计数器的计数值初始化为预设阈值(例如，第三阈值)。在该实现方式中，第一计数器的初始值为预设阈值(例如，第三阈值)，触发RLF的计数值为0或第一取值。可以理解的是，第一计数器的计数值达到(或，小于或等于)0或第一取值将/会触发RLF。
可选的，第一计数器的计数值不变可以包括/替换为：第一用户设备确定第一计数器的计数值不变，或，第一计数器的计数值维持不变。
在本申请实施例提供的通信方法中，第一用户设备未接收第一反馈信息，第一用户设备将第一计数器初始化，或者，第一计数器的计数值不变。第一用户设备由于未接收第一反馈信息导致未接收到第一反馈信息，而并非由于无线链路(例如，SL)存在问题导致未接收到第一反馈信息。第一计数器不统计由于第一用户设备未接收第一反馈信息导致未接收到第一反馈信息的情况，能够避免第一计数器的计数值错误/过早/过快地达到触发RLF的计数值，进而降低误触发RLF的概率，进而也可以降低通信时延、提高/保证通信的质量或可靠性。
S603、第一用户设备接收第一反馈信息，并且第一用户设备未接收到第一反馈信息， 第一用户设备将第一计数器的计数值增加1或减少1。在该方法中，第一用户设备接收但未接收到第一反馈信息，可能是由于无线链路(例如，SL)存在问题导致第一用户设备未接收到第一反馈信息。第一计数器统计第一用户设备接收但未接收到第一反馈信息的情况。
可选的，步骤S603可以包括/替换为：针对单播连接，第一用户设备接收第一反馈信息，并且第一用户设备未接收到第一反馈信息，第一用户设备将第一计数器的计数值增加1或减少1。
需要说明的是，在第一计数器的初始值为0或第一取值，触发RLF的计数值为预设阈值(例如，第三阈值)的情况下，第一用户设备接收第一反馈信息，并且第一用户设备未接收到第一反馈信息，第一用户设备将第一计数器的计数值增加1。
需要说明的是，在第一计数器的初始值为预设阈值(例如，第三阈值)，触发RLF的计数值为0或第一取值的情况下，第一用户设备接收第一反馈信息，并且第一用户设备未接收到第一反馈信息，第一用户设备将第一计数器的计数值减少1。
相比于现有技术，该方法增加了第一计数器的计数值增加或减少的条件限制，因此，能够避免第一计数器的计数值错误/过早/过快地达到触发RLF的计数值，进而避免误触发RLF，进而也可以降低通信时延、提高/保证通信的质量或可靠性。
需要说明的是，第一计数器的计数值可以增加1或者减少1，即第一计数器的计数值变化的粒度/步长可以为1。或者，第一计数器的计数值还可以增加a或者减少a，a为正整数，即，第一计数器的计数值变化的粒度/步长还可以为a，本申请对此不作任何限定。可以理解的是，第一用户设备将第一计数器的计数值增加1或减少1可以替换为：第一用户设备将第一计数器的计数值增加a或减少a。
S604、第一用户设备接收到第一反馈信息，第一用户设备将第一计数器初始化。
可选的，步骤S604可以包括/替换为：针对单播连接，第一用户设备接收到第一反馈信息，第一用户设备将第一计数器初始化。
可选地，本申请还包括：第一计数器的计数值达到(或，大于或等于)第三阈值，或，第一计数器的计数值达到(或，小于或等于)0或第一取值，第一用户设备执行以下任一项或多项：第一用户设备触发/检测到RLF，第一用户设备的MAC层(或，MAC实体，或，HARQ实体，或，SL HARQ实体)向第一用户设备的上层(例如，RRC层)指示检测到RLF，第一用户设备向网络设备发送第一指示信息。
可选的，第一用户设备触发/检测到RLF可以包括/替换为：第一用户设备确定触发/检测到RLF。
其中，第一指示信息用于指示第一用户设备检测到RLF，或，用于指示发生了RLF，或，用于指示SL失败的原因为RLF。
示例性的，第一指示信息用于指示：针对第一单播连接或第一SL的RRC连接，第一用户设备检测到RLF，或，发生了RLF，或，SL失败的原因为RLF。
示例性地，第一指示信息可以包含在侧行链路用户设备信息(sidelink UE information，SUI)中，本申请对此不作任何限定。
可以理解的是，第一用户设备触发RLF，并上报至网络设备，以表明无线链路(例如，SL)存在异常或无线链路(例如，SL)失败。
可选的，本申请还包括：单播连接建立，或，第三阈值/第一取值被配置或重配置， 第一用户设备将第一计数器初始化。
可选地，第一用户设备未接收第一反馈信息，包括：第一反馈信息的接收与第一传输冲突，第一用户设备未接收第一反馈信息。
在该方法中，用于RLF检测的第一计数器不统计资源冲突/传输冲突的情况，能够使得第一计数器排除其他可能导致第一用户设备未接收到第一反馈信息的原因，尽量针对性地统计由于无线链路(例如，SL)存在问题导致第一用户设备未接收到第一反馈信息的次数，从而进一步避免第一计数器的计数值错误/过早/过快地达到触发RLF的计数值，进而避免误触发RLF，进而也可以降低通信时延、提高/保证通信的质量或可靠性。
在本申请实施例中，第一传输是不同于第一反馈信息的接收的其他传输。
第一传输可以包括第一发送和/或第一接收。
示例性地，第一传输可以为PSFCH的发送，UL传输，或者LTE SL传输。
可选地，第一反馈信息的接收与第一传输冲突，第一用户设备未接收第一反馈信息，包括：第一反馈信息的接收与第一传输冲突，并且第一反馈信息的接收的优先级低于或等于第一传输的优先级，第一用户设备未接收第一反馈信息；或，第一反馈信息的接收与第一传输冲突，并且第一反馈信息的接收的优先级低于或等于第一传输的优先级。
可选的，第一反馈信息的接收的优先级低于或等于第一传输的优先级可以理解/替换为：第一反馈信息的接收没有被优先。
可选的，第一反馈信息的接收的优先级低于或等于第一传输的优先级可以包括：第一用户设备确定第一反馈信息的接收的优先级低于或等于第一传输的优先级。
可选的，第一反馈信息的接收没有被优先可以包括：第一用户设备确定第一反馈信息的接收没有被优先。
在该方法中，若发生资源冲突/传输冲突，并且第一反馈信息的接收的优先级较低，第一用户设备执行优先级较高的第一传输，而不执行第一反馈信息的接收，导致未接收到第一反馈信息，而并非由于无线链路存在问题导致未接收到第一反馈信息。第一计数器不统计由于第一用户设备未接收第一反馈信息导致未接收到第一反馈信息的情况，能够避免第一计数器的计数值错误/过早/过快地达到触发RLF的计数值，进而避免误触发RLF，进而也可以降低通信时延、提高/保证通信的质量或可靠性。
在本申请实施例中，接收或传输的优先级的定义，以及优先级的比较，详见说明书的前序中PSFCH的接收与其他传输/接收冲突部分，在此不再赘述。
示例性地，结合图2，图7示出了现有协议和本申请实施例提供的通信方法用于RLF检测过程。其中，第一计数器和现有协议中计数器的初始值均为0，触发RLF的计数值均为3。现有协议用于RLF检测的过程详见图2所述的内容，在此不再赘述。以下将对本申请实施例提供的通信方法用于RLF检测的过程进行阐述。
在第1个PSFCH监听时机，由于PSFCH的接收与其他传输冲突且PSFCH的接收没有被优先，发送端UE未接收PSFCH。第一计数器的计数值不变，仍然为初始值0。
在第2个PSFCH监听时机，发送端UE接收PSFCH，但未接收到PSFCH。第一计数器的计数值增加1，变成1。
在第3个PSFCH监听时机，发送端UE接收到PSFCH。第一计数器被初始化为0。
在第4个PSFCH监听时机，发送端UE接收PSFCH，但未接收到PSFCH。第一计数器的 计数值增加1，变成1。
在第5个PSFCH监听时机，发送端UE接收PSFCH，但未接收到PSFCH。第一计数器的计数值增加1，变成2。
在第6个PSFCH监听时机，由于PSFCH的接收与其他传输冲突且PSFCH的接收没有被优先，发送端UE未接收PSFCH。第一计数器的计数值不变，仍然为2。
在第7个PSFCH监听时机，发送端UE接收到PSFCH。第一计数器被初始化为0。
在第8个PSFCH监听时机，由于PSFCH的接收与其他传输冲突且PSFCH的接收没有被优先，发送端UE未接收PSFCH。第一计数器的计数值不变，仍然为0。
在第9个PSFCH监听时机，由于PSFCH的接收与其他传输冲突且PSFCH的接收没有被优先，发送端UE未接收PSFCH。第一计数器的计数值不变，仍然为0。
在第10个PSFCH监听时机，发送端UE接收到PSFCH。第一计数器被初始化为0。
在第11个PSFCH监听时机，发送端UE接收到PSFCH。第一计数器的计数值不变，仍然为0，或者说，第一计数器被初始化为0。
可以理解的是图7中仅示出了与第一单播连接或第一SL的RRC连接相关联的PSFCH监听时机，与其他的单播连接或者组播通信关联的PSFCH接收与本方案不相关，未在图中示出。
需要说明的是，图7中仅示意性地画出11个PSFCH监听时机，实际的PSFCH监听时机在时域上可能是连续的也可能不是连续的，不同的PSFCH监听时机在时域上还可能是重叠的，本申请实施例对此不作任何限定。
根据上述分析可知，相比于现有技术，本申请实施例提供的通信方法中的第一用户设备不会在第6个PSFCH监听时机误触发RLF，进而也可以降低通信时延、提高/保证通信的质量或可靠性。
一种可能的实现方式(实现方式1)中，本申请还包括：第一用户设备与第二用户设备之间的信号质量大于或等于第一阈值，第一用户设备在执行步骤S601之后，执行步骤S602、S603、S604中的任一项或多项。
可选的，第一用户设备与第二用户设备之间的信号质量大于或等于第一阈值可以包括：第一用户设备确定/判断第一用户设备与第二用户设备之间的信号质量大于或等于第一阈值。
需要说明的是，“第一用户设备确定/判断第一用户设备与第二用户设备之间的信号质量大于或等于第一阈值”和步骤S601之间的先后顺序本申请不限定。
示例性的，第一用户设备与第二用户设备之间的信号质量大于或等于第一阈值可以理解为第一用户设备与第二用户设备之间的信号质量较好。
可以理解的是，信号质量较好时，说明无线链路正常，用于RLF检测的第一计数器不统计由于第一用户设备未接收第一反馈信息导致未接收到第一反馈信息的情况，能够避免误触发RLF，进而也可以降低通信时延、提高/保证通信的质量或可靠性。
在本申请实施例中，第一用户设备与第二用户设备之间的信号质量的确定，可以基于参考信号接收功率(reference signal received power，RSRP)，参考信号接收质量(reference signal received quality，RSRQ)，信道状态信息(channel state information，CSI)，SL-CSI，或者探测参考信号(sounding reference signal，SRS)等，本申请对此 不作任何限定。另一种可能的实现方式(实现方式2)中，本申请还包括：第一用户设备与第二用户设备之间的信号质量小于或者等于第二阈值，如图6b所示，第一用户设备在执行步骤S601之后，执行步骤S605和/或S606。
可选的，第一用户设备与第二用户设备之间的信号质量小于或者等于第二阈值可以包括：第一用户设备确定/判断第一用户设备与第二用户设备之间的信号质量小于或者等于第二阈值。
需要说明的是，“第一用户设备确定/判断第一用户设备与第二用户设备之间的信号质量小于或者等于第二阈值”和步骤S601之间的先后顺序本申请不限定。
示例性的，第一用户设备与第二用户设备之间的信号质量小于或者等于第二阈值可以理解为第一用户设备与第二用户设备之间的信号质量较差。
S605、第一用户设备未接收到第一反馈信息，第一用户设备将第一计数器的计数值增加1。
可选的，步骤S605可以包括/替换为：针对单播连接，第一用户设备未接收到第一反馈信息，第一用户设备将第一计数器的计数值增加1。
第一用户设备未接收到第一反馈信息包括：第一用户设备未接收第一反馈信息，和/或，第一用户设备接收第一反馈信息，并且第一用户设备未接收到第一反馈信息。
S606、第一用户设备接收到第一反馈信息，第一用户设备将第一计数器初始化，或者，第一计数器的计数值不变。
可选的，步骤S606可以包括/替换为：针对单播连接，第一用户设备接收到第一反馈信息，第一用户设备将第一计数器初始化，或者，第一计数器的计数值不变。
可以理解的是，信号质量较差时，说明无线链路可能存在异常。这种情况下，用于RLF检测的第一计数器统计由于第一用户设备未接收第一反馈信息导致未接收到第一反馈信息的情况，能够更快地触发RLF，进一步地，可以尽快恢复/重建该单播连接，降低通信的时延。
需要说明的是，第一阈值和第二阈值可以相同也可以不同，本申请不限定。
需要说明的是，实现方式1和实现方式2可以分别作为单独的实施例(或者说，实现方式2可以不依赖于实现方式1，或者说，实现方式2不依赖于步骤S602、S603、S604)，或者实现方式1和实现方式2可以相互结合(或者说，步骤S602、S603、S604中的任一项或多项可以和步骤S605和/或S606相结合)，本发明对此不做限制。
如图8所示，为本申请实施例提供的另一种通信方法，该通信方法包括如下步骤：
S801、第一用户设备通过SL向第二用户设备发送第一数据。
步骤S801的描述可参见步骤S601的相关描述，在此不再赘述。
在步骤S801之后，第一用户设备可以执行步骤S802和/或S803。
S802、第一用户设备未接收第一反馈信息，第一用户设备将第二计数器的计数值增加1或减少1。
其中，第一反馈信息指示第二用户设备是否成功接收第一数据。
第一反馈信息相关的内容可参见图6所述实施例中的相关描述，在此不再赘述。
其中，第二计数器用于统计第一用户设备连续未接收反馈信息的次数。
可选的，步骤801可以包括/替换为：针对单播连接，第一用户设备未接收第一反馈 信息，第一用户设备将第二计数器的计数值增加1或减少1。
可选的，第一数据、第一控制信息、第一反馈信息、第一反馈资源、反馈信息、第二计数器、第二指示信息、第三指示信息、PSFCH监听时机中的任一项或多项与单播连接(例如，一个单播连接，或，第一单播连接)和/或SL的RRC连接(例如，一个SL的RRC连接，或，第一SL的RRC连接)相关联。
可选的，可以理解的是，本申请实施例提供的通信方法可以是针对单播连接(例如，一个单播连接)执行的，或者，本申请实施例提供的通信方法可以是针对一个单播连接关联的SL进程(例如，所有SL进程)执行的。
需要说明的是，第二计数器的计数值可以增加1或者减少1，即第二计数器的计数值变化的粒度/步长可以为1。或者，第二计数器的计数值还可以增加b或者减少b，b为正整数，即，第二计数器的计数值变化的粒度/步长还可以为b，本申请对此不作任何限定。可以理解的是，第一用户设备将第二计数器的计数值增加1或减少1可以替换为：第一用户设备将第二计数器的计数值增加b或减少b。
需要说明的是，第二计数器可以单独使用，或者，第二计数器可以与本申请实施例提供的第一计数器同时使用，或者，第二计数器可以与图2所示的现有协议中的计数器同时使用，本申请对此不作任何限定。
S803、第一用户设备接收第一反馈信息，第一用户设备将第二计数器初始化。
可选的，步骤802可以包括/替换为：针对单播连接，第一用户设备接收第一反馈信息，第一用户设备将第二计数器初始化。
在一种可能的实现方式中，第一用户设备将第二计数器初始化包括：第一用户设备将第二计数器的计数值初始化为0或第二取值。在该实现方式中，第二计数器的初始值为0或第二取值，触发RLF、触发第二指示信息和/或第三指示信息的发送、触发资源重选中的任一项或多项的计数值为预设阈值(例如，第四阈值)。可以理解的是，第二计数器的计数值达到(或，大于或等于)预设阈值(例如，第四阈值)将/会触发RLF、触发第二指示信息和/或第三指示信息的发送、触发资源重选中的任一项或多项。
示例性的，第二取值可以为整数。例如，第二取值可以为1等，本申请不限定。
示例性的，资源重选可以包括SL资源重选。
在另一种可能的实现方式中，第一用户设备还可以将第二计数器的计数值初始化为预设阈值(例如，第四阈值)。在该实现方式中，第二计数器的初始值为预设阈值(例如，第四阈值)，触发RLF、触发第二指示信息和/或第三指示信息的发送、触发资源重选中的任一项或多项的计数值为0或第二取值。可以理解的是，第二计数器的计数值达到(或，小于或等于)0或第二取值将/会触发RLF、触发第二指示信息和/或第三指示信息的发送、触发资源重选中的任一项或多项。
需要说明的是，在第二计数器的初始值为0或第二取值，触发RLF、触发第二指示信息和/或第三指示信息的发送、触发资源重选中的任一项或多项的计数值为预设阈值(例如，第四阈值)的情况下，第一用户设备接收第一反馈信息，并且第一用户设备未接收到第一反馈信息，第一用户设备将第二计数器的计数值增加1。
需要说明的是，在第二计数器的初始值为预设阈值(例如，第四阈值)，触发RLF、触发第二指示信息和/或第三指示信息的发送、触发资源重选中的任一项或多项的计数值为0 或第二取值的情况下，第一用户设备接收第一反馈信息，并且第一用户设备未接收到第一反馈信息，第一用户设备将第二计数器的计数值减少1。
可选的，本申请还包括：单播连接建立，或，第四阈值/第二取值被配置或重配置，第一用户设备将第二计数器初始化。
可选地，本申请还包括：第二计数器的计数值达到(或，大于或等于)第四阈值，或，第二计数器的计数值达到(或，小于或等于)0或第二取值，第一用户设备执行以下任一项或多项：第一用户设备触发/检测到RLF，第一用户设备的MAC层(或，MAC实体，或，HARQ实体，或，SL HARQ实体)向第一用户设备的上层(例如，RRC层)指示检测到RLF，第一用户设备向网络设备发送第二指示信息和/或第三指示信息，或，第一用户设备触发资源重选。
可选的，第一用户设备触发/检测到RLF可以包括/替换为：第一用户设备确定触发/检测到RLF。
其中，第二指示信息用于指示第一用户设备检测到RLF，或，用于指示发生了RLF，或，用于指示SL失败的原因为RLF。
其中，第三指示信息用于指示第二计数器的计数值达到(或，大于或等于)第四阈值或第二计数器的计数值达到(或，小于或等于)0或第二取值，或，用于指示第一用户设备连续未接收反馈信息的次数达到预设阈值(例如，第四阈值)，或，用于指示反馈信息的接收和其他传输连续冲突的次数达到预设阈值(例如，第四阈值)。
示例性的，第二指示信息用于指示：针对第一单播连接或第一SL的RRC连接，第一用户设备检测到RLF，或，发生了RLF，或，SL失败的原因为RLF。
示例性的，第三指示信息用于指示：针对第一单播连接或第一SL的RRC连接，第二计数器的计数值达到(或，大于或等于)第四阈值或第二计数器的计数值达到(或，小于或等于)0或第二取值，或，第一用户设备连续未接收反馈信息的次数达到预设阈值(例如，第四阈值)，或，反馈信息的接收和其他传输连续冲突的次数达到预设阈值(例如，第四阈值)。
需要说明的是第二指示信息可以和第一指示信息相同，也可以不同，本申请不限定。
可选地，第二指示信息还可以用于指示触发/检测到RLF的原因。例如，原因可以包括第一用户设备连续未接收反馈信息的次数达到预设阈值(例如，第四阈值)，或，反馈信息的接收和其他传输连续冲突的次数达到预设阈值(例如，第四阈值)，或，第二计数器的计数值达到(或，大于或等于)第四阈值或第二计数器的计数值达到(或，小于或等于)0或第二取值。
示例性地，第二指示信息和/或第三指示信息可以包含在侧行链路用户设备信息(sidelink UE information，SUI)中，本申请对此不作任何限定。
在本申请实施例提供的另一种通信方法中，第一用户设备可以向网络设备上报第二指示信息(例如，触发/检测到RLF的原因)和/或第三指示信息，向网络指示了目前资源冲突/传输冲突的概率很大(或者说，向网络指示了目前资源冲突/传输冲突的次数达到了一定的阈值)，从而网络设备可以相应地调整某些参数，以降低资源冲突/传输冲突的概率，有利于提高通信质量、降低通信时延、保证通信的可靠性。
在本申请实施例提供的另一种通信方法中，第一用户设备触发/检测到RLF，可以让第 一用户设备采取对应的策略，例如，重新恢复单播连接、或重建单播连接，有利于提高通信质量、降低通信时延、保证通信的可靠性。
在本申请实施例提供的另一种通信方法中，第一用户设备触发资源重选，可以让第一用户设备重新选择资源，有利于降低资源冲突/传输冲突的概率，，有利于提高通信质量、降低通信时延、保证通信的可靠性。
需要说明的是，本申请中，不同的实施例可以相互结合，不同实施例中的部分的内容/步骤之间的相互结合或不同实施例的全部内容之间的相互结合。
需要说明的是，本申请中，针对相同的术语/内容，在不同的实施例中，为了简便，没有重复解释，如无特殊说明，在不同实施例是可以通用的。
其中，由于上述实施例中的第一用户设备可以采用如图4所示的通信装置40的架构，因此，上述实施例中第一用户设备的动作可以由图4所示的通信装置40中的处理器401调用存储器403中存储的应用程序代码以指令第一用户设备执行，本实施例对此不作任何限制。
或者，其中，上述步骤S601-S602、步骤S801-S802中第一用户设备的动作可以由图5所示的移动终端50中的处理器510调用存储器(包括内部存储器521或与外部存储器接口520连接的外部存储器)中存储的应用程序代码以指令移动终端执行。本实施例对此不作任何限制。
可以理解的是，以上各个实施例中，由第一用户设备实现的方法和/或步骤，也可以由可用于第一用户设备的部件(例如芯片或者电路)实现。
上述主要从第一用户设备的角度对本申请实施例提供的方案进行了介绍。相应的，本申请实施例还提供了通信装置，该通信装置用于实现上述各种方法。该通信装置可以为上述方法实施例中的第一用户设备，或者包含上述第一用户设备的装置，或者为可用于第一用户设备的部件。可以理解的是，该通信装置为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法实施例中对通信装置进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
图9示出了一种通信装置90的结构示意图。该通信装置90包括收发模块901和处理模块902。所述收发模块901，也可以称为收发单元用以实现收发功能，例如可以是收发电路，收发机，收发器或者通信接口。
以通信装置90为上述方法实施例中的第一用户设备为例，则：收发模块901，用于通过侧行链路SL向第二用户设备发送第一数据。处理模块902，用于未接收第一反馈信息，将第一计数器初始化，或者，第一计数器的计数值不变。其中，第一反馈信息指示第二用 户设备是否成功接收第一数据；第一计数器用于RLF检测。
一种可能的实现方式中，收发模块901，还用于接收第一反馈信息。处理模块902，还用于未接收到第一反馈信息，将第一计数器的计数值增加1。
一种可能的实现方式中，未接收第一反馈信息，包括：若第一反馈信息的接收与第一传输冲突，未接收第一反馈信息。
一种可能的实现方式中，未接收第一反馈信息，包括：若第一反馈信息的接收与第一传输冲突，并且第一反馈信息的接收的优先级低于或等于第一传输的优先级，未接收第一反馈信息。
一种可能的实现方式中，处理模块902，用于将第一计数器初始化包括：用于将第一计数器的计数值初始化为0。
一种可能的实现方式中，处理模块902，还用于第一用户设备与第二用户设备之间的信号质量小于或者等于第二阈值，未接收到第一反馈信息，将第一计数器的计数值增加1。
一种可能的实现方式中，收发模块901，还用于第一计数器的计数值大于或等于第三阈值，向网络设备发送第一指示信息，第一指示信息用于指示第一用户设备检测到RLF。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该通信装置90以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。
当通信装置90为上述方法实施例中的第一用户设备时，在一个简单的实施例中，本领域的技术人员可以想到该通信装置90可以采用图4所示的形式。
比如，图4所示的第一用户设备中的处理器401或407可以通过调用存储器403中存储的计算机执行指令，使得第一用户设备执行上述方法实施例中的通信方法。具体的，图9中的收发模块901和处理模块902的功能/实现过程可以通过图4所示的第一用户设备中的处理器401或407调用存储器中存储的计算机执行指令来实现。或者，图9中的处理模块902的功能/实现过程可以通过图4所示的第一用户设备中的处理器401或407调用存储器中存储的计算机执行指令来实现，图9中的收发模块901的功能/实现过程可以通过图4中所示的通信接口404来实现。
或者，当通信装置90为上述方法实施例中的第一用户设备，并且第一用户设备为移动终端时，在一个简单的实施例中，本领域的技术人员可以想到通信装置90可以采用图5所示的移动终端50的形式。
比如，图5所示的移动终端50中的处理器510可以通过调用存储器(包括内部存储器521或与外部存储器接口520连接的外部存储器)中存储的计算机执行指令，使得移动终端50执行上述方法实施例中的通信方法。具体的，图9中的收发模块901和处理模块902的功能/实现过程可以通过图5所示的移动终端50中的处理器510调用存储器中存储的计算机执行指令来实现。或者，图9中的处理模块902的功能/实现过程可以通过图5所示的移动终端50中的处理器510调用存储器中存储的计算机执行指令来实现，图9中的收发模块901的功能/实现过程可以通过图5中所示的无线通信模块550来实现。
由于本实施例提供的通信装置90可执行上述通信方法，因此其所能获得的技术效果 可参考上述方法实施例，在此不再赘述。
需要说明的是，以上模块或单元的一个或多个可以软件、硬件或二者结合来实现。当以上任一模块或单元以软件实现的时候，所述软件以计算机程序指令的方式存在，并被存储在存储器中，处理器可以用于执行所述程序指令并实现以上方法流程。该处理器可以内置于SoC(片上系统)或ASIC，也可是一个独立的半导体芯片。该处理器内处理用于执行软件指令以进行运算或处理的核外，还可进一步包括必要的硬件加速器，如现场可编程门阵列(field programmable gate array，FPGA)、PLD(可编程逻辑器件)、或者实现专用逻辑运算的逻辑电路。
当以上模块或单元以硬件实现的时候，该硬件可以是CPU、微处理器、数字信号处理(digital signal processing，DSP)芯片、微控制单元(microcontroller unit，MCU)、人工智能处理器、ASIC、SoC、FPGA、PLD、专用数字电路、硬件加速器或非集成的分立器件中的任一个或任一组合，其可以运行必要的软件或不依赖于软件以执行以上方法流程。可选的，本申请实施例还提供了一种芯片系统，包括：至少一个处理器和接口，该至少一个处理器通过接口与存储器耦合，当该至少一个处理器执行存储器中的计算机程序或指令时，使得上述任一方法实施例中的方法被执行。在一种可能的实现方式中，该通信装置还包括存储器。可选的，该芯片系统可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书，可理解并实现所述公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱 离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (20)

  1. 一种通信方法，其特征在于，包括：
    第一用户设备通过侧行链路SL向第二用户设备发送第一数据；
    所述第一用户设备未接收第一反馈信息，所述第一用户设备将第一计数器初始化，或者，所述第一计数器的计数值不变；
    其中，所述第一反馈信息指示所述第二用户设备是否成功接收所述第一数据；所述第一计数器用于无线链路失败RLF检测。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述第一用户设备接收所述第一反馈信息，并且所述第一用户设备未接收到所述第一反馈信息，所述第一用户设备将第一计数器的计数值增加1。
  3. 根据权利要求1所述的方法，其特征在于，所述第一用户设备未接收第一反馈信息，包括：所述第一反馈信息的接收与第一传输冲突，所述第一用户设备未接收所述第一反馈信息。
  4. 根据权利要求3所述的方法，其特征在于，所述第一反馈信息的接收与第一传输冲突，所述第一用户设备未接收所述第一反馈信息，包括：
    所述第一反馈信息的接收与所述第一传输冲突，并且所述第一反馈信息的接收的优先级低于或等于所述第一传输的优先级。
  5. 根据权利要求1-4任一项所述的方法，其特征在于，所述第一用户设备将所述第一计数器初始化包括：所述第一用户设备将所述第一计数器的计数值初始化为0。
  6. 根据权利要求1-5任一项所述的方法，其特征在于，所述第一用户设备与所述第二用户设备之间的信号质量大于或等于第一阈值。
  7. 根据权利要求1-6任一项所述的方法，其特征在于，所述方法还包括：所述第一用户设备与所述第二用户设备之间的信号质量小于或者等于第二阈值，所述第一用户设备未接收到所述第一反馈信息，所述第一用户设备将所述第一计数器的计数值增加1。
  8. 根据权利要求1-7任一项所述的方法，其特征在于，所述第一反馈信息在物理侧行反馈信道PSFCH上传输。
  9. 根据权利要求1-8任一项所述的方法，其特征在于，所述方法还包括：所述第一计数器的计数值大于或等于第三阈值，所述第一用户设备向网络设备发送第一指示信息，所述第一指示信息用于指示所述第一用户设备检测到RLF。
  10. 一种通信装置，其特征在于，所述通信装置包括：收发模块和处理模块；
    所述收发模块，用于通过侧行链路SL向第二用户设备发送第一数据；
    所述处理模块，用于未接收第一反馈信息，将第一计数器初始化，或者，所述第一计数器的计数值不变；
    其中，所述第一反馈信息指示所述第二用户设备是否成功接收所述第一数据；所述第一计数器用于无线链路失败RLF检测。
  11. 根据权利要求10所述的通信装置，其特征在于，所述收发模块，还用于接收所述第一反馈信息；
    所述处理模块，还用于未接收到所述第一反馈信息，将第一计数器的计数值增加1。
  12. 根据权利要求10所述的通信装置，其特征在于，所述未接收第一反馈信息，包括： 所述第一反馈信息的接收与第一传输冲突，未接收所述第一反馈信息。
  13. 根据权利要求12所述的通信装置，其特征在于，所述未接收第一反馈信息，包括：
    所述第一反馈信息的接收与所述第一传输冲突，并且所述第一反馈信息的接收的优先级低于或等于所述第一传输的优先级。
  14. 根据权利要求10-13任一项所述的通信装置，其特征在于，所述处理模块用于将所述第一计数器初始化包括：用于将所述第一计数器的计数值初始化为0。
  15. 根据权利要求10-14任一项所述的通信装置，其特征在于，所述第一用户设备与所述第二用户设备之间的信号质量大于或等于第一阈值。
  16. 根据权利要求10-15任一项所述的通信装置，其特征在于，所述处理模块还用于所述第一用户设备与所述第二用户设备之间的信号质量小于或者等于第二阈值，未接收到所述第一反馈信息，将所述第一计数器的计数值增加1。
  17. 根据权利要求10-16任一项所述的通信装置，其特征在于，所述第一反馈信息在物理侧行反馈信道PSFCH上传输。
  18. 根据权利要求10-17任一项所述的通信装置，其特征在于，所述收发模块，还用于所述第一计数器的计数值大于或等于第三阈值，向网络设备发送第一指示信息，所述第一指示信息用于指示所述第一用户设备检测到RLF。
  19. 一种通信装置，其特征在于，包括：存储器以及与所述存储器耦合的处理器，所述存储器用于存储程序，所述处理器用于执行所述存储器存储的所述程序；当所述通信装置运行时，所述处理器运行所述程序，使得所述通信装置执行上述权利要求1-9中任一项所述的方法。
  20. 一种计算机可读存储介质，其特征在于，其上存储有计算机程序，当所述计算机程序被计算机执行时使得所述计算机执行权利要求1-9中任一项所述的方法。
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