Communication method and device

Abstract

Disclosed are a communication method and apparatus, the method comprising: a first terminal device sends first indication information to a second terminal device, the first indication information being used for indicating a first time-frequency resource, and the first time-frequency resource being used for the first terminal device to send first data; when the second terminal equipment does not receive first data from the first terminal equipment on at least one time-frequency resource in the first time-frequency resources, triggering a sidelink SL beam to fail; the second terminal device sends a first reference signal to the first terminal device; the first reference signal is used for beam failure recovery. According to the method, the SL beam failure is triggered when the data is not received on the time-frequency resource, so that the resource waste caused by sending the periodic reference signal to carry out SL beam failure judgment can be avoided.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communication technologies, and in particular, to a communication method and apparatus. Background Art

[0002] With the development of wireless technologies, in order to relieve the network load, the device-to-device (D2D) communication technology is proposed. Through the D2D communication technology, user equipment (UE) within a certain distance range can directly communicate through a sidelink (SL) without relaying through a third-party device (such as a base station).

[0003] In the air interface transmission from a network device to a terminal device (UTRAN-to-UE, Uu) in a new radio (NR) system, for beam failure recovery in the FR2 frequency band (i.e., 24250 MHz to 52600 MHz), processes such as beam failure detection (BFD) and candidate beam detection (CBD) are included. Among them, the network device and the terminal device configure a periodic reference signal as the reference signal for BFD to perform beam failure detection, which causes a problem of large resource overhead. Summary of the Invention

[0004] The embodiments of the present application disclose a communication method and apparatus. By triggering an SL beam failure when data is not received in time-frequency resources, the resource waste caused by sending a periodic reference signal for SL beam failure determination can be avoided.

[0005] The following introduces the present application from different aspects. It should be understood that the implementation manners and beneficial effects of the following different aspects can be referred to each other.

[0006] In a first aspect, the present application discloses a communication method. This method can be executed by a second terminal device or a module (such as a chip) in the second terminal device. The method may include: receiving first indication information from a first terminal device, where the first indication information is used to indicate first time-frequency resources, and the first time-frequency resources are used for the first terminal device to send first data; triggering a sidelink SL beam failure when the first data from the first terminal device is not received on at least one of the first time-frequency resources; sending a first reference signal; the first reference signal is used for beam failure recovery.

[0007] In an embodiment of the present application, by utilizing the resource selection characteristic of SL, it is determined whether to trigger an SL beam failure based on whether there is data transmission in the first time-frequency resource (i.e., the reserved resource) indicated by the first terminal device. This method does not require the sender (i.e., the first terminal device) to send a periodic reference signal for determination, can achieve fast beam failure recovery detection, can avoid resource waste caused by sending a periodic reference signal, and reduce resource overhead.

[0008] In combination with the first aspect, in a possible implementation manner, at least one time-frequency resource is at least one retransmission resource of the first data; or, at least one time-frequency resource is at least one periodic resource of the first data; or, at least one time-frequency resource includes at least one retransmission resource of the first data and at least one periodic resource of the first data.

[0009] In an embodiment of the present application, the resource type of at least one time-frequency resource is not limited, and it can be a retransmission resource of the first data and / or a periodic resource of the first data. Whether to trigger an SL beam failure can be determined based on whether there is data transmission in the reserved resource in different resource transmission scenarios, and the applicable scenarios are flexible.

[0010] In combination with the first aspect, in a possible implementation manner, at least one time-frequency resource is N periodic resources of the first data, where N is a positive integer. When the first data from the first terminal device is not received on at least one of the first time-frequency resources, triggering a sidelink SL beam failure includes: when the data from the first terminal device is not received on the N periodic resources, triggering an SL beam failure.

[0011] In combination with the first aspect, in a possible implementation manner, N is an integer greater than 1, and the periodic durations between two adjacent periodic resources in the N periodic resources in the time domain are all equal.

[0012] Among them, the equal periodic durations between two adjacent periodic resources in the N periodic resources in the time domain may refer to: consecutive N periodic resources, where N is an integer greater than 1. For example, when the second terminal device does not receive the data from the first terminal device on a continuous plurality of periodic resources, an SL beam failure is triggered, and the present application does not limit the number of consecutive periodic resources.

[0013] In an embodiment of the present application, when the second terminal device does not receive the data from the first terminal device on a plurality of adjacent periodic resources in the time domain, an SL beam failure is triggered, which can avoid false triggering of the SL beam failure caused by individual data transmission failures due to other reasons, and can improve the accuracy of triggering the SL beam failure.

[0014] In combination with the first aspect, in a possible implementation manner, at least one time-frequency resource is at least one retransmission resource for the first data; when the first data from the first terminal device is not received on at least one of the time-frequency resources in the first time-frequency resource, triggering a sidelink (SL) beam failure includes: when the data from the first terminal device is not received on one or two of the at least one retransmission resource, triggering the SL beam failure.

[0015] In combination with the first aspect, in a possible implementation manner, when the data from the first terminal device is not received on at least one of the time-frequency resources in the first time-frequency resource, triggering an SL beam failure includes: when the data from the first terminal device is not received on at least one of the time-frequency resources, sending second indication information to the first terminal device, where the second indication information is used to indicate that the data is not received on at least one of the time-frequency resources; when the third indication information from the first terminal device is not received within the first time period, triggering the SL beam failure, where the third indication information is used to indicate that no beam failure has occurred.

[0016] In the embodiments of the present application, when the second terminal device determines that there is no data transmission on the first time-frequency resource (i.e., the reserved resource) indicated by the first terminal device, the second terminal device sends beam failure confirmation information (i.e., the above-mentioned second indication information) to the first terminal device; when the third indication information from the first terminal device is not received within the first time period, triggering the SL beam failure, where the third indication information is used to indicate that no beam failure has occurred. This method can prevent the second terminal device from wrongly triggering the SL beam failure due to the first terminal device not sending data for other reasons.

[0017] In combination with the first aspect, in a possible implementation manner, the second indication information is sent through a first physical layer sidelink feedback channel (PSFCH) resource; the first PSFCH resource has the same time domain as the second PSFCH resource for hybrid automatic repeat request (HARQ) feedback of the first data but different frequency domains. In the embodiments of the present application, by setting the frequency domains of the first PSFCH resource and the second PSFCH resource to be different, the PSFCH resource for transmitting the second indication information and the PSFCH resource for HARQ feedback of the first data can be distinguished.

[0018] In a possible implementation manner, the second indication information can reuse the existing HARQ method and resources, that is, the second terminal device can feedback a response message (such as NACK) corresponding to the first data to the first terminal device when the first data is not received; at this time, the third indication information can be the retransmitted data of the first data, and the second terminal device determines whether to trigger the SL beam failure according to whether the retransmitted data is received within the first time period. For example, if the retransmitted data is not received, the SL beam failure is triggered, and if the retransmitted data is received, the SL beam failure is not triggered.

[0019] In combination with the first aspect, in a possible implementation, the start time and end time of the first time period are determined based on the time when the second indication information is sent and the time offset.

[0020] In combination with the first aspect, in a possible implementation, the first reference signal is one of a sidelink synchronization signal block S-SSB, a sidelink channel state information reference signal SL CSI-RS, and a demodulation reference signal DMRS.

[0021] In a second aspect, the present application discloses a communication method. This method can be executed by a first terminal device or a module (e.g., a chip) in the first terminal device. The method may include: sending first indication information to a second terminal device, where the first indication information is used to indicate first time-frequency resources for sending first data; receiving second indication information from the second terminal device, where the second indication information is used to indicate that no data is received on at least one time-frequency resource not in the first time-frequency resources; sending third indication information to the second terminal device within a first time period, where the third indication information is used to indicate that no sidelink SL beam failure has occurred.

[0022] In an embodiment of the present application, when the second terminal device determines that no data is received on the first time-frequency resources (i.e., the reserved resources) indicated by the first terminal device, it can send beam failure confirmation information (i.e., the above-mentioned second indication information) to the first terminal device; after receiving the second indication information, if the first terminal device fails to send the first data for other reasons, it can send the third indication information to the second terminal device within the first time period. This method can prevent the second terminal device from wrongly triggering an SL beam failure when the first terminal device fails to send data for other reasons. This method can improve the accuracy of triggering an SL beam failure.

[0023] In a third aspect, the present application provides a communication device, which can be the second terminal device or a chip / circuit therein. The communication device is used to execute the method in the first aspect or any possible implementation manner of the first aspect. The communication device includes units for executing the method in the first aspect or any possible implementation manner of the first aspect.

[0024] In a fourth aspect, the present application provides a communication device, which can be the first terminal device or a chip / circuit therein. The communication device is used to execute the method in the second aspect or any possible implementation manner of the second aspect. The communication device includes units for executing the method in the second aspect or any possible implementation manner of the second aspect.

[0025] In a third aspect or a fourth aspect, the above communication device may include a transceiver unit and a processing unit. For a specific description of the transceiver unit and the processing unit, reference may also be made to the device embodiments shown below. The beneficial effects of the above third aspect to the fourth aspect may refer to the relevant descriptions of the foregoing first aspect and second aspect, and will not be elaborated here.

[0026] In a fifth aspect, the present application provides a communication device, which may include a processor and an interface circuit, and the processor is connected to the interface circuit. Among them, the interface circuit is used to interact (or transmit and receive or input and output) information or data, and the processor is used to run program instructions so that the communication device executes the method described in any possible implementation manner of the above first aspect, or the above second aspect, or any one of them. Among them, the interface circuit may be a communication interface or a transceiver. The transceiver may be a radio frequency module in the communication device, or a combination of a radio frequency module and an antenna, or an input / output interface of a chip or a circuit.

[0027] In a sixth aspect, the present application provides a readable storage medium, on which program instructions are stored, and when it runs on a computer, it causes the computer to execute the method described in any possible implementation manner of the above first aspect, or the above second aspect, or any one of them.

[0028] In a seventh aspect, the present application provides a program product containing program instructions, and when it runs, it causes the method described in any possible implementation manner of the above first aspect, or the above second aspect, or any one of them to be executed.

[0029] In an eighth aspect, the present application provides a device, which may be implemented in the form of a chip or in the form of a device, and the device includes a processor. The processor is used to read and execute the program stored in the memory to execute one or more of the above first aspect or the above second aspect, or the information interaction method provided in one or more of any possible implementation manners of any one of them. Optionally, the device further includes a memory, and the memory is connected to the processor through a circuit. Further optionally, the device further includes a communication interface, and the processor is connected to the communication interface. The communication interface is used to receive the information to be processed, the processor obtains the information from the communication interface, processes the information, and outputs the processing result through the communication interface. The communication interface may be an input / output interface.

[0030] In a possible implementation manner, the above processor and memory may be physically independent units, or the memory may also be integrated with the processor.

[0031] In a ninth aspect, the present application provides a communication system, which includes a second terminal device and a first terminal device; the second terminal device is configured to execute the method described in the first aspect or any possible implementation manner of the first aspect, and the first terminal device is configured to execute the method described in the second aspect or any possible implementation manner of the second aspect.

[0032] The technical effects achieved by the above aspects can be referred to each other or to the beneficial effects in the method embodiments shown below, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figures 1A to 1C is a schematic diagram of related technologies provided by an embodiment of the present application;

[0034] Figures 2A to 2C is a schematic diagram of the communication system provided by an embodiment of the present application;

[0035] Figure 3 is a schematic flowchart of a communication method provided by an embodiment of the present application;

[0036] Figure 4 is a schematic flowchart of another communication method provided by an embodiment of the present application;

[0037] Figure 5A is a schematic diagram of a UE1 indicating retransmission resources and periodic resources to a UE2 provided by an embodiment of the present application;

[0038] Figure 5B is a schematic flowchart of a beam failure recovery process provided by an embodiment of the present application;

[0039] Figure 6 is a schematic flowchart of yet another communication method provided by an embodiment of the present application;

[0040] Figure 7A is a schematic diagram of sending beam failure confirmation information provided by an embodiment of the present application;

[0041] Figure 7B is a schematic flowchart of another beam failure recovery process provided by an embodiment of the present application;

[0042] Figure 8 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

[0043] Figure 9 is another schematic structural diagram of a communication device provided by an embodiment of the present application;

[0044] Figure 10 is yet another schematic structural diagram of a communication device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

[0046] In the description of the present application, terms such as "first" and "second" are only used to distinguish different objects, and do not limit the quantity and execution order. Moreover, terms such as "first" and "second" do not necessarily mean different. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device, etc. that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products, or devices, etc.

[0047] In the description of the present application, unless otherwise specified, " / " means "or". For example, A / B may represent A or B. The "and / or" herein is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, "at least one (item)", "one (or more) of the following items" or similar expressions refer to any combination of these items, including any combination of single item (or multiple items). For example, at least one (item) of a, b, or c may represent: a, b, c; a and b; a and c; b and c; or a, b, and c. Where a, b, and c can be single or multiple.

[0048] In the description of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary", "for example", or "such as" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary", "for example", or "such as" is intended to present relevant concepts in a specific manner.

[0049] It can be understood that in the description of the present application, "when...", "if", and "in case" all refer to the device making corresponding processing under a certain objective situation, which does not limit the time, and does not require the device to have a judgment action when implemented, nor does it mean there are other limitations. Among them, the device making corresponding processing under a certain objective situation includes: meeting the objective situation, that is, being able to perform the corresponding processing; or meeting the objective situation and other situations before being able to perform the corresponding processing.

[0050] The term "simultaneously" in this application can be understood as at the same time point, or within a period of time, or within the same cycle. Specifically, it can be understood in combination with the context.

[0051] In this application, elements represented in the singular are intended to mean "one or more", rather than "one and only one", unless otherwise specified.

[0052] In addition, the terms "system" and "network" are often used interchangeably in this article.

[0053] It can be understood that in the embodiments of this application, expressions such as "A corresponds to B", "A is corresponding to B", "B corresponding to A", or similar expressions mean that B is associated with A, and B can be determined according to A. Determining B according to A does not mean determining B only according to A, but also B can be determined according to A and / or other information.

[0054] To facilitate the understanding of the technical solutions of the embodiments of this application, a brief introduction to the related technologies and terms of this application is first given.

[0055] 1. Cellular Vehicle-to-Everything (C-V2X)

[0056] C-V2X is a V2X communication technology developed based on cellular systems. It utilizes and enhances the current cellular network functions and elements to achieve low-latency and high-reliability communication between various nodes in the vehicle network. Exemplarily, C-V2X includes vehicle-to-vehicle (V2V) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-infrastructure (V2I) communication, and vehicle-to-network (V2N) communication. As the cellular system evolves from the fourth generation (4G) Long-Term Evolution (LTE) to the fifth generation (5G), C-V2X evolves from LTE-V2X to NR-V2X (New Radio V2X).

[0057] 5G NR V2X can support lower transmission latency, more reliable communication transmission, higher throughput, better user experience, and meet the requirements of a wider range of application scenarios. Further, the vehicle-to-vehicle communication technology supported by V2X can be extended and applied to D2D communication under any system.

[0058] This application is applicable to D2D communication under any system.

[0059] 2. NRSL System

[0060] Under network coverage, the terminal device can obtain the SL resource pool configuration information and / or the SL bandwidth part (BWP) configuration information by receiving the system information block (SIB) of the network device, the cell-specific radio resource control (RRC) signaling, or the UE-specific RRC signaling of the terminal device. The terminal device can also use the pre-configured SL resource pool configuration information or SL BWP configuration information. The SL BWP configuration information can include SL resource pool information for configuring the number of resource pools included in the BWP. The SL BWP configuration information can include SL bandwidth information for indicating the bandwidth size for SL communication, such as indicating that the SL bandwidth is 20 megahertz (MHz).

[0061] (1) Sidelink Control Information (SCI)

[0062] The SCI of the NR SL system is divided into the first-level SCI and the second-level SCI. The physical sidelink control channel (PSCCH) carries the first-level SCI, and the first-level SCI is used to schedule the second-level SCI and the physical sidelink shared channel (PSSCH). Since SL is a distributed system, all UEs need to correctly decode the first-level SCI before they can decode the second-level SCI and PSSCH.

[0063] Figure 1A An exemplary schematic diagram of the PSCCH is shown. As Figure 1AAs shown in the figure, the horizontal axis is time (t), and the vertical axis is frequency (f). The gray rectangular area is used to represent the PSCCH, and the slanted rectangular area is used to represent the automatic gain control (AGC). It can be seen that the PSCCH can exist in each subchannel of each time slot. That is, the starting position of a PSCCH in the time domain is the second symbol for SL transmission in each time slot, and the length can be 2 or 3 symbols (determined by the resource pool configuration information). The frequency domain position is the index value of the smallest physical resource block (PRB) of each subchannel, and the length is at least 10 PRBs (determined by the resource pool configuration information) but does not exceed the size of the subchannel.

[0064] The Frequency resource assignment field and the Time resource assignment field in the first-level SCI are respectively used to indicate the frequency domain resources and time domain resources for transmitting the PSSCH. The Resource reservation period field is used to indicate the resources for periodic reservation of transmitting the PSSCH. The value of the Resource reservation period field is configured by the network device or pre-configured, or predefined. For example, it is indicated by the first RRC signaling, and the first RRC signaling can make sl-ResourceReservePeriod1 determined. The format of the second-level SCI is indicated by the 2nd-stage SCI format field in the first-level SCI.

[0065] (2) Resource selection process

[0066] In the Rel-16 V2X SL, the transmission resources of the transmitting end in the user self-selection resource mode (mode 2) do not depend on the base station. The transmitting end UE1 selects the transmission resources by itself within the resource selection window according to the results sensed within its own sensing window for communication.

[0067] Assume that the transmitting end UE1 triggers resource selection in time slot n. The specific resource selection process is as Figure 1B shown:

[0068] Step 1: Determine the candidate resource R subCH in units of one time slot and L x,y consecutive subchannels, and the resource selection window [n + T 1 , n + T 2 , where is determined by Table 1, μ SL is the configured subcarrier spacing, and T 1The selection of T is based on implementation. If T 2min (higher layer configuration) is less than the remaining packet delay budget (PDB), then T 2min ≤T 2 ≤PDB, T 2 's selection is based on implementation; otherwise T 2 is equal to the remaining PDB.

[0069] Step 2: Determine the sensing window where T 0 is configured by higher layer parameters, and is determined by Table 2.

[0070] Step 3: Determine the threshold Th(p i ,p j ) of the reference signal received power (RSRP). The threshold of RSRP is related to prioTX of the data to be transmitted and prioRX of the received SCI. Th(p i ,p j ) is specifically the (prioRX + (prioTX - 1) * 8)-th threshold in the set of RSRP thresholds configured for the resource pool.

[0071] Step 4: Initialize the available resource set SA to include all time-frequency resources in the resource selection window.

[0072] Step 5: Exclude the following time-frequency resources from SA: all periodic resource reservation time slots configured for the resource pool corresponding to the time slots not sensed (transmitted time slots) in the sensing window.

[0073] Step 5a: If the time-frequency resources excluded from SA are less than X% of the total resources in the resource selection window, re-execute the initialization in Step 4.

[0074] Step 6: Continue to exclude the following time-frequency resources from SA: for which the first-level received SCI is decoded successfully, and the result of RSRP measurement on the demodulation reference signal (DMRS) of the time-frequency resources reserved by the received first-level SCI is higher than the RSRP threshold determined in Step 3, and the time-frequency resources reserved by the received first-level SCI are within the resource selection window, including the retransmission resources and periodic reservation resources indicated by the first-level SCI.

[0075] Step 7: If the remaining resources in SA are less than X% of the total resources of the resource selection window, where the value of X% is configured by the resource pool and is related to prioTX, then by increasing the RSRP threshold determined in step 3 (increasing by 3 each time), until it satisfies that the remaining resources in SA are not less than X% of the total resources of the resource selection window, and then continue to execute step 4.

[0076] Report S A to the upper layer (medium access control (MAC) layer).

[0077] Table 1

[0078]

[0079] Table 2

[0080]

[0081] (3) Physical sidelink feedback channel (PSFCH)

[0082] NR SL performs hybrid automatic repeat request HARQ-ACK feedback through PSFCH. For one PSSCH transmission, if the transmitting user carries HARQ-ACK feedback enabling information in the control information, the receiving user needs to feedback the corresponding ACK / NACK information according to the decoding result of this PSSCH, where the ACK / NACK information is transmitted through the PSFCH channel. The PSFCH channel resources are configured as periodic resources in the resource pool, and its period configuration parameter can be 0, 1, 2, 4. Among them indicates that there is no PSFCH resource configured in this resource pool, and PSFCH transmission is not enabled in this resource, that is, physical layer HARQ feedback is not supported; it means means that there will be one PSFCH feedback time slot in every SL time slot within a time window.

[0083] Figure 1C is a schematic diagram of a PSFCH provided by an embodiment of the present application. As Figure 1C shown, in the time slot where the physical resources of PSFCH are located, PSFCH occupies the last two orthogonal frequency division multiplexing (OFDM) symbols before the guard interval symbol (GAP), that is Figure 1C the slanted rectangles marked 11 and 12 in Figure 1C It also exemplarily shows the time-frequency positions of PSFCH in SL transmission when the PSFCH periods are 1, 2, and 4 respectively.

[0084] The PSFCH resource determination process is as follows: The resource pool configures a bitmap of the PSFCH frequency-domain resources to indicate whether the specific PRBs on the frequency-domain resources where the resource pool is located can be used as PSFCH resources. That is, the length of the bit information contained in the bitmap is equal to the number of PRBs in the resource pool. A '1' in the bitmap indicates that the corresponding PRB can be used for PSFCH transmission, and a '0' in the bitmap indicates that the corresponding PRB resource cannot be used for PSFCH transmission.

[0085] 3. Beam management technology

[0086] Beam management is an important technology proposed by 5G NR for FR2, which refers to the process by which the Base Station (BS) and the UE acquire and maintain a set of beams for transmission and reception, and is the reference workflow for beamforming in the MIMO system. The frequency range definitions of FR1 and FR2 are shown in Table 3 as follows:

[0087] Table 3: Definition of frequency range

[0088] Frequency range name Corresponding frequency range FR1 410 MHz - 7125 MHz FR2 24250 MHz - 52600 MHz

[0089] According to the working state, beam management can be divided into three states, and the operations in each state are summarized as follows:

[0090] P-1: The UE measures the set of BS transmission beams and selects the BS transmission beam and the UE reception beam.

[0091] P-2: Based on P-1, the UE measures a smaller set of BS transmission beams to improve the BS transmission beam.

[0092] P-3: The UE measures the same BS transmission beam using different reception beams to improve its own reception beam.

[0093] Based on the above content, the beam management of the downlink is carried out, and its basic process is as follows: The BS configures up to 64 beam directions, each beam direction corresponding to a synchronization signal block (SSB) and the time-frequency resources that the UE should use when reporting beams. The BS sequentially sends SSBs to each direction in a scanning manner, and the UE measures the RSRP of the SSB. After that, the UE selects a set of SSBs by comparing the RSRP and reports the SSB numbers in the set and the corresponding RSRP to the base station on the given time-frequency resources, and the base station uses the reported information to perform beam determination. To implement the transmission beam training in the P-2 working state, the BS will allocate K S transmission beams with K SA number of channel state information reference signal (CSI-RS) resources are then transmitted in a periodic beam scanning manner. Among these CSI-RS resources, the maximum number of CSI-RS ports is 2, and other uncertain resource mapping information needs to be configured by the BS and indicated to the UE through RRC signaling. Meanwhile, the BS transmits CSI-RS resources in only a single beam direction at a certain moment. The UE performs beam measurement to obtain the CSI-RS reference signal received power RSRP and acquires the CSI-RS Resource Indicator (CRI). After measuring the RSRP, the UE selects one or several RSRP values and the corresponding CRI and reports them to the BS on the given time-frequency resources. The BS uses the reported information to determine the transmission beam to be used.

[0094] A similar process is also used for beam management in the uplink, but different reference signals are used.

[0095] 4. Beam Failure Recovery for FR2 in NR Uu

[0096] In NR Uu, for beam failure recovery of FR2, it includes several processes such as beam failure detection, candidate beam identification, beam failure recovery request (BFRQ), and beam failure recovery response (BFRR). The specific descriptions are as follows:

[0097] (1) Beam failure detection. Currently, the determination condition for beam failure detection is that for N consecutive times, all serving beams are considered to have failed through the following criterion. Here, N is indicated by the beamFailureInstanceMaxCount field in the RRC signaling; the criterion for a serving beam to be considered failed is that the block error rate (BLER) of the hypothetical physical downlink control channel (PDCCH) corresponding to the RSRP of the reference signal used for beam failure detection in the serving beam is higher than a given threshold, and this threshold uses the default BLER threshold declared for out-of-sync in radio link monitoring (RLM).

[0098] (2) Candidate beam identification. The gNB transmits corresponding reference signals in a series of candidate beams to help the UE identify the transmit and receive beam pairs that can restore the connection. The aforementioned reference signals can be CSI-RS or SSB, specifically indicated by the candidateBeamRSList field in the RRC signaling. When the UE finds that the RSRP of the reference signal in the candidate beam is higher than the configured threshold, the corresponding candidate beam is considered available, and this threshold is explicitly or implicitly indicated by the rsrp-ThresholdSSB field in the RRC signaling.

[0099] (3) Beam failure recovery request. The UE mainly sends the BFRQ on the physical random access channel (PRACH). There are also solutions indicating that it can be sent in a scanning manner on the physical uplink control channel (PUCCH). The BFRQ contains the identification information of the UE. If the UE identifies a new gNB candidate transmit beam, the BFRQ also contains the information of this candidate beam. If the UE does not identify a new gNB candidate transmit beam, the BFRQ indicates that the candidate beam does not exist.

[0100] (4) Beam failure recovery response. The UE monitors the response of the gNB to the BFRR. The UE monitors the response of the gNB to the BFRR within a time window. If a response is received, the BFR is successful. If no response is received, the BFRQ is sent again. When the BFRQ is repeatedly sent a certain number of times and no response from the gNB is still received, the UE will notify the higher-layer entity that it is in a link failure state. Subsequently, the higher-layer link recovery mechanism will be used.

[0101] Currently, in NR Uu, the beam failure recovery for the FR2 frequency band includes processes such as BFD and CBD. Among them, the network device and the terminal device need to configure periodic reference signals as the reference signals for BFD to perform beam failure detection, which will cause a problem of large resource overhead. In addition, there is no beam failure recovery technology in the SL system. If the beam failure recovery of the SL system adopts the beam failure recovery technology for FR2 in NR Uu and configures periodic reference signals between UEs as the reference signals for BFD, then, due to the lack of unified scheduling by the base station in the SL system, the configuration of periodic BFD reference signals between UEs in the SL system will cause a greater resource overhead than the base station sending periodic BFD reference signals to multiple UEs in the NR system.

[0102] In view of this, the embodiments of the present application provide a communication method. By triggering the SL beam failure when no data is received on the time-frequency resource, it is possible to avoid the resource waste caused by sending periodic reference signals for SL beam failure determination.

[0103] Based on the above, in order to better understand a communication method and related device proposed in this application, the network architecture applied in the embodiments of this application will be described below.

[0104] Please refer to Figures 2A to 2C , Figures 2A to 2C which is a schematic diagram of the network architecture of the communication system provided in the embodiments of this application.

[0105] As Figures 2A to 2C shown, the communication system may at least include: a first terminal device 201 and a second terminal device 202. Optionally, the communication system may further include a network device 203. Figures 2A to 2C Exemplarily, it is shown that both the first terminal device 201 and the second terminal device 202 are vehicles, and the first terminal device 201 and the second terminal device 202 communicate through proximity communication (PC5).

[0106] This application is applicable to communication scenarios with and without network coverage. As Figure 2A shown, the first terminal device 201 and the second terminal device 202 may both be within the coverage range of the network device 203; or, as Figure 2B shown, one of the first terminal device 201 and the second terminal device 202 may be within the coverage range of the network device 203, and the other may be outside the coverage range of the network device 203. Figure 2B Exemplarily, it is shown that the first terminal device 201 is within the coverage range of the network device 203, and the second terminal device 202 is outside the coverage range of the network device 203; or, as Figure 2C shown, the first terminal device 201 and the second terminal device 202 may both be outside the coverage range of the network device 203.

[0107] The communication system of this application is a system for direct communication between user terminals such as V2X and D2D. Exemplarily, both the first terminal device 201 and the second terminal device 202 have the ability of V2X communication. Using the V2X technology based on the cellular network, the first terminal device 201 and the second terminal device 202 can directly communicate through SL. For example, using the V2X technology based on the cellular network, the first terminal device 201 and the second terminal device 202 can directly interact vehicle data through SL to achieve mutual perception between devices (such as vehicles).

[0108] The SL communication between the first terminal device 201 and the second terminal device 202 in this application can be a mode in which the user independently selects resources, and this application does not limit the mode in which the user independently selects resources.

[0109] Among them, the first terminal device 201 and the second terminal device 202 are entities on the user side for receiving or transmitting signals.

[0110] In the embodiments of the present application, the first terminal device 201 and the second terminal device 202 may respectively refer to in-vehicle communication modules or communication terminals or other embedded communication modules, handheld communication terminals (such as mobile phones, tablets, etc.), RSUs, etc. In some embodiments, the device forms of the first terminal device 201 and the second terminal device 202 may be the same. For example, both the first terminal device 201 and the second terminal device 202 are in-vehicle communication terminals. In other embodiments, the device forms of the first terminal device 201 and the second terminal device 202 may also be different. For example, the first terminal device 201 is an in-vehicle communication terminal, and the second terminal device 202 is an RSU. That is to say, the embodiments of the present application are applicable to scenarios such as in-vehicle communication module (communication terminal) and in-vehicle communication module (communication terminal), in-vehicle communication module (communication terminal) and handheld communication terminal, in-vehicle communication module (communication terminal) and RSU, handheld communication terminal and RSU, etc. As an example, Figures 2A to 2C it is exemplified by taking both the first terminal device 201 and the second terminal device 202 as in-vehicle communication modules (or in-vehicle communication terminals, which are set in Figures 2A to 2C the vehicle shown).

[0111] The network device 203 may be an entity for transmitting or receiving signals, such as a radio access network (RAN) node that connects a terminal (the above-mentioned first terminal device 201 and / or second terminal device 202) to a wireless network. Currently, some examples of RAN nodes are: gNB, transmission reception point (TRP), evolved Node B (eNB) (or macro base station), micro base station, radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved Node B, or home Node B, HNB), base band unit (BBU), base band pool BBU, or wireless fidelity (Wifi) access point (AP), etc. In one network architecture, the network device 203 may include a centralized unit (CU) node, or a distributed unit (DU) node, or a RAN device including a CU node and a DU node. Among them, in the O-RAN system, the CU may also be referred to as O-CU, and the DU may also be referred to as O-DU. In some embodiments, in V2X technology, the above-mentioned network device 203 may also be a terminal, which is a terminal in a vehicle-to-everything (V2X) network that can schedule resources for other terminals (such as the above-mentioned first terminal device 201), such as a head terminal, or a group head terminal. Of course, this terminal may also have the ability of V2X communication, that is, it can directly interact with other terminals (such as the above-mentioned first terminal device 201 and / or second terminal device 202) through SL for data (such as vehicle data).

[0112] It should be noted that, in the embodiments of the present application, the above cellular network may be a cloud radio access network (CRAN), a heterogeneous network (HetNet), a universal mobile telecommunications system (UMTS), 4G LTE, or 5G NR, or other mobile communication systems, such as the next-generation mobile communication system, without limitation. In addition, the network device 203 and the terminal, such as the first terminal device 201, interact through the Uu (UTRAN-to-UE) air interface.

[0113] It should be noted that the present application can be applied to any scenario of direct communication between terminals. For example, the present application can also be applied to the communication between a remote UE and a relay UE in a UE-to-network relay scenario, and can also be applied to the communication between a source UE and a relay UE in a UE-to-UE relay scenario, and can also be applied to the communication between a relay UE and a target UE, and can also be applied to a cooperation scenario, etc. The embodiments of the present application are described by taking the scenario of sidelink communication as an example, and the application scenario is not limited.

[0114] Combined with the above network architecture, a communication method provided by the embodiments of the present application will be described below.

[0115] Please refer to Figure 3 , Figure 3 which is a schematic flowchart of a communication method provided by the embodiments of the present application. The functions executed by the first terminal device in this embodiment can also be executed by a module (for example, a chip) in the first terminal device. The functions executed by the second terminal device in the present application can also be executed by a module (for example, a chip) in the second terminal device.

[0116] As Figure 3 shown, the communication method may include the following steps:

[0117] S301: The first terminal device sends first indication information to the second terminal device. The first indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used for the first terminal device to send first data.

[0118] Correspondingly, the second terminal device receives the first indication information from the first terminal device.

[0119] Among them, the first time-frequency resource is at least one retransmission resource of the first data; or, the first time-frequency resource is at least one periodic resource of the first data; or, the first time-frequency resource includes at least one retransmission resource of the first data and at least one periodic resource of the first data.

[0120] For example, when the first time-frequency resource is at least one retransmission resource of the first data, the first data is the retransmitted data, and the data corresponding to each retransmission resource is the same, which is the first data. For another example, when the first time-frequency resource is at least one periodic resource of the first data, the first data is the sum of the periodic data corresponding to each periodic resource, where the periodic data corresponding to each periodic resource is different. For another example, when the first time-frequency resource includes at least one retransmission resource of the first data and at least one periodic resource of the first data, the first data includes the retransmitted data and the periodic data corresponding to each periodic resource, and the data corresponding to each retransmission resource is the same.

[0121] Exemplarily, the first indication information may be SCI or media access control element MAC CE.

[0122] S302: When the second terminal device does not receive the first data from the first terminal device on at least one of the time-frequency resources in the first time-frequency resource, a sidelink SL beam failure is triggered.

[0123] Among them, the at least one time-frequency resource may be the first time-frequency resource, that is to say, the first time-frequency resource may be one or more time-frequency resources. The fact that the first data from the first terminal device is not received on at least one of the time-frequency resources in the first time-frequency resource means that the first data from the first terminal device is not received on all the time-frequency resources in the first time-frequency resource. Or, the at least one time-frequency resource may be part of the time-frequency resources in the first time-frequency resource, that is to say, the first time-frequency resource includes multiple time-frequency resources. The fact that the first data from the first terminal device is not received on at least one of the time-frequency resources in the first time-frequency resource means that the data from the first terminal device is not received on some of the time-frequency resources in the first time-frequency resource.

[0124] Among them, not received means that the second terminal device receives or decodes the first-level SCI and the second-level SCI, but does not receive or decode the corresponding data. Or, not received means that the second terminal device receives or decodes the first-level SCI, but does not receive or decode the second-level SCI and the corresponding data. Or, not received means that the second terminal device does not receive or decode the first-level SCI, the second-level SCI, and the corresponding data.

[0125] In some embodiments, when the second terminal device does not receive the first data from the first terminal device on at least one time-frequency resource in the first time-frequency resource, it triggers an SL beam failure.

[0126] Among them, the at least one time-frequency resource may be at least one retransmission resource of the first data; or, the at least one time-frequency resource may be at least one periodic resource of the first data; or, the at least one time-frequency resource includes at least one retransmission resource of the first data and at least one periodic resource of the first data.

[0127] Exemplarily, the at least one time-frequency resource is N periodic resources of the first data, where N is a positive integer; at this time, when the second terminal device does not receive data from the first terminal device on the N periodic resources, it triggers an SL beam failure. For example, the above N may be an integer greater than 1, and the time intervals between two adjacent periodic resources in the N periodic resources in the time domain are equal. That is to say, when the second terminal device does not receive periodic data from the first terminal device on multiple adjacent periodic resources in the time domain, it triggers an SL beam failure.

[0128] In another exemplary case, the at least one time-frequency resource may be at least one retransmission resource of the first data; at this time, when the second terminal device does not receive data from the first terminal device on one or two of the at least one retransmission resources, it triggers an SL beam failure.

[0129] In another exemplary case, the at least one time-frequency resource may include at least one periodic resource of the first data and at least one retransmission resource of the first data; at this time, when the second terminal device does not receive data from the first terminal device on at least one resource among at least one periodic resource of the first data or at least one retransmission resource of the first data, it triggers an SL beam failure, or the second terminal device may sort multiple time-frequency resources (including at least one periodic resource and at least one retransmission resource) according to time, and trigger a beam failure when it does not receive data on consecutive multiple time-frequency resources, where the number of consecutive time-frequency resources is not limited.

[0130] In some other embodiments, when the second terminal device does not receive data from the first terminal device on at least one time-frequency resource in the first time-frequency resource, it first sends second indication information to the first terminal device, and the second indication information is used to indicate that data has not been received on the at least one time-frequency resource; when it does not receive third indication information from the first terminal device within the first time period, it then triggers an SL beam failure, and the third indication information is used to indicate that no beam failure has occurred.

[0131] Optionally, the second indication information may be used to indicate beam failure confirmation; or, the second indication information is used to request beam situation feedback.

[0132] Optionally, the third indication information is used to indicate that the beam is normal; alternatively, the third indication information is used to indicate that the first data has not been sent yet; alternatively, the third indication information is used to indicate the reason why the first data has not been sent; alternatively, the third indication information is the first data or other data reserved for transmission between the first terminal device and the second terminal device.

[0133] Optionally, the second indication information is sent through the first physical layer sidelink feedback channel (PSFCH) resource; the first PSFCH resource has the same time domain as the second PSFCH resource for hybrid automatic repeat request (HARQ) feedback of the first data but different frequency domains.

[0134] Optionally, the start time and end time of the first time period are determined based on the time when the second indication information is sent and a time offset. Alternatively, the first time period can be predefined, or configured, or preconfigured. It should be understood that "predefined" can be understood as being defined by a standard and not requiring configuration by other devices (and the network device or other terminal devices cannot change it either), and it is information pre-recorded / written in the hardware and / or software of the terminal device itself (such as the first terminal device and the second terminal device); "configured" is divided into network device configuration and terminal device configuration. If it is network device configuration, it can be changed through SIB or RRC signaling; if it is terminal device configuration, it can be changed according to PC5-RRC signaling; "preconfigured" can be understood as information pre-recorded / written in the hardware and / or software of the terminal device itself, determined by the device manufacturer at the factory, and can be changed through software or hardware.

[0135] Exemplarily, the first time period can be within M time slots or M time windows after the second indication information is sent, where M is a positive integer. Among them, the number of time slots and the position of the time window can be predefined, or configured, or preconfigured. It should be understood that "predefined" can be understood as being defined by a standard and not requiring configuration by other devices (and the network device or other terminal devices cannot change it either), and it is information pre-recorded / written in the hardware and / or software of the terminal device itself (such as the first terminal device and the second terminal device); "configured" is divided into network device configuration and terminal device configuration. If it is network device configuration, it can be changed through SIB or RRC signaling; if it is terminal device configuration, it can be changed according to PC5-RRC signaling; "preconfigured" can be understood as information pre-recorded / written in the hardware and / or software of the terminal device itself, determined by the device manufacturer at the factory, and can be changed through software or hardware.

[0136] Among them, at least one time-frequency resource can be at least one retransmission resource of the first data; or, at least one time-frequency resource can be at least one periodic resource of the first data; or, at least one time-frequency resource includes at least one retransmission resource of the first data and at least one periodic resource of the first data.

[0137] Exemplarily, at least one time-frequency resource is N periodic resources of the first data, where N is a positive integer. At this time, when the second terminal device does not receive data from the first terminal device on the N periodic resources, it first sends second indication information to the first terminal device. When it does not receive third indication information from the first terminal device within the first time period, it then triggers SL beam failure. For example, the above N can be an integer greater than 1, and the time intervals between two adjacent periodic resources in the time domain among the N periodic resources are all equal. That is to say, when the second terminal device does not receive periodic data from the first terminal device on multiple adjacent periodic resources in the time domain, it sends second indication information to the first terminal device.

[0138] In another example, at least one time-frequency resource can be at least one retransmission resource of the first data. At this time, when the second terminal device does not receive data from the first terminal device on one or two of the at least one retransmission resources, it first sends second indication information to the first terminal device. When it does not receive third indication information from the first terminal device within the first time period, it then triggers SL beam failure.

[0139] In yet another example, at least one time-frequency resource can include at least one periodic resource of the first data and at least one retransmission resource of the first data. At this time, when the second terminal device does not receive data from the first terminal device on at least one of the at least one periodic resources or the at least one retransmission resources of the first data, it first sends second indication information to the first terminal device. When it does not receive third indication information from the first terminal device within the first time period, it then triggers SL beam failure.

[0140] S303: The second terminal device sends a first reference signal to the first terminal device; the first reference signal is used for beam failure recovery.

[0141] Correspondingly, the first terminal device receives the first reference signal from the second terminal device. It should be understood that step S303 is an optional step, Figure 3 and is shown by a dashed line.

[0142] In some embodiments, the second terminal device can send the first reference signal on multiple different reference signal resources, and the multiple reference signal resources respectively correspond to different beams. Furthermore, the first terminal device can perform beam measurement on the received first reference signal, determine the first reference signal resource from the multiple reference signal resources, and the first reference signal resource corresponds to the first beam. The first terminal device sends indication information of the first reference signal resource to the second terminal device, that is, feeds back the first beam to the second terminal device. The first terminal device can use the first beam to perform data transmission with the second terminal device, such as sending the first data.

[0143] Optionally, the first reference signal is one of a sidelink synchronization signal block S-SSB, a sidelink channel state information reference signal SL CSI-RS, and a demodulation reference signal DMRS.

[0144] It should be understood that the above first reference signal may also be referred to as a CBD reference signal.

[0145] The above Figure 3 The method embodiments shown above include many possible implementation solutions. The following combines Figures 4 to 7B to illustrate some of the implementation solutions. It should be noted that Figures 4 to 7B For related concepts, operations, or logical relationships not explained, reference may be made to Figure 3 the corresponding descriptions in the illustrated embodiments.

[0146] Figure 4 is a schematic flowchart of another communication method provided by an embodiment of the present application.

[0147] In the embodiments of the present application, the communication method provided by the present application is introduced in detail by taking the first terminal device as UE1 and the second terminal device as UE2 as examples. The functions performed by UE1 in the embodiments of the present application may also be performed by a module (for example, a chip) in UE1, and the functions performed by UE2 in the present application may also be performed by a module (for example, a chip) in UE2.

[0148] As Figure 4 shown, the communication method may include the following steps in part or in whole:

[0149] S401: UE1 sends an SCI to UE2. The SCI is used to indicate a first time-frequency resource, where the first time-frequency resource includes a retransmission resource of first data and / or a periodic resource of first data.

[0150] Figure 5A is a schematic diagram of UE1 indicating a retransmission resource and a periodic resource to UE2 provided by an embodiment of the present application. As Figure 5A shown, according to the (2) resource selection process in the above related technology, UE1 may select Figure 5A the retransmission resources (R1 and R2) and periodic resources (P1 and P2) therein, and indicate these resources in the SCI sent in time slot t1.

[0151] Exemplarily, the retransmission resource may be indicated by the Frequency resource assignment field and the Timeresource assignment field in the SCI, and the periodic resource is indicated by the Resource reservation period field in the SCI.

[0152] It should be understood that step S401 can also be referred to as UE1 indicating / reserving the retransmission resources and / or periodic resources for the first data; the first time-frequency resource can also be referred to as the reserved resource or the reservation resource. For example, Figure 5A exemplarily shows that the first time-frequency resource includes two retransmission resources (R1 and R2 respectively) and two periodic resources (P1 and P2 respectively), and R1, R2, P1, and P2 can be referred to as four reservation resources.

[0153] S402: When UE2 does not receive data on part or all of the time-frequency resources of the first time-frequency resource, it triggers an SL beam failure.

[0154] It should be understood that UE2 determines the retransmission resources and / or periodic resources of UE1 according to the information indicated / reserved by UE1 in the SCI, and UE2 expects to receive the data transmitted by UE1 on the corresponding time-frequency resources. Exemplarily, if UE2 does not receive Figure 5A one or more of the reservation resources in

[0155] In one implementation, UE1 only indicates / reserves retransmission resources: If UE2 does not receive one or more of R1, R2, and subsequent retransmission resources (in the prior art, UE can only indicate two retransmission resources in one transmission, but can continue to indicate new retransmission resources on the retransmission resources, such as R2), an SL beam failure is triggered. It should be noted that if UE2 has already fed back an ACK response to the data, that is, UE1 does not need to retransmit, the SL beam failure is not triggered.

[0156] In another implementation, UE1 only indicates / reserves periodic resources: If UE2 does not receive one or more of P1, P2, and subsequent resources, an SL beam failure is triggered, where the number of non-received resources is determined by a threshold.

[0157] In yet another implementation, if UE1 indicates / reserves retransmission resources and periodic resources, that is, the first time-frequency resource includes retransmission resources and periodic resources. For example, the first time-frequency resource can include R1, P1, R2, P2 as shown in Figure 5A : Then, if UE2 does not receive the data of one or more indicated / reserved resources, an SL beam failure is triggered, where the number of non-received resources is determined by a threshold. For example, UE2 can trigger an SL beam failure when it does not receive N consecutive reservation resources (such as R1, P1, R2, P2) in chronological order, where N is an integer greater than 1.

[0158] S403: UE2 sends a CBD reference signal to UE1.

[0159] In one implementation, after the UE2 triggers a beam failure, the UE2 can use the S-SSB or SL CSI-RS as the CBD reference signal (i.e., CBD RS) and send the CBD reference signal. For example, when the UE2 sends the S-SSB, it carries both the SRC ID and the DST ID at the same time, and the UE1 determines that it is the CBD RS sent by the UE2 based on the SRC ID and the DST ID. For another example, the UE2 can indicate in the SCI / MAC CE that the RS is used for beam failure recovery.

[0160] S404: The UE1 feeds back the first beam to the UE2 based on the CBD reference signal.

[0161] In one implementation, the CBD reference signals are sent through different beams, that is, each CBD reference signal corresponds to a beam. Among them, the different beams include the first beam; the UE1 can measure the multiple received CBD reference signals and select the beam corresponding to the CBD reference signal with the measured RSRP higher than the threshold and / or the maximum RSRP as the first beam; after determining the first beam, the UE1 can feed back the first beam to the UE2 on the corresponding preset resource.

[0162] Among them, the first beam can also be called the best beam.

[0163] S405: The UE1 uses the first beam to send the first data to the UE2.

[0164] For ease of understanding, the following Figure 5B illustrates the specific process of the above Figure 4 . Figure 5B is a schematic diagram of a beam failure recovery process provided by an embodiment of the present application. As Figure 5B shown, the UE2 triggers an SL beam failure according to the information indicated / reserved by the UE1 and triggers the sending of the CBD reference signal. The UE1 measures the reference signal to determine the first beam and feeds it back. Finally, the UE1 uses the first beam for data transmission.

[0165] The embodiment of the present application utilizes the resource selection characteristic of the SL and determines whether an SL beam failure occurs based on whether the first time-frequency resource (i.e., the already reserved resource) is transmitted. This method does not require the sender to send periodic reference signals for judgment, can achieve fast beam failure recovery detection, and can avoid resource waste caused by sending periodic reference signals.

[0166] Figure 6 is a schematic diagram of another communication method provided by an embodiment of the present application.

[0167] In the embodiments of the present application, taking the first terminal device as UE1 and the second terminal device as UE2 as examples, the communication method provided by the present application is introduced in detail. In the embodiments of the present application, the functions executed by UE1 can also be executed by modules (such as chips) in UE1, and the functions executed by UE2 in the present application can also be executed by modules (such as chips) in UE2.

[0168] In the embodiments of the present application, after the receiving end (UE2) does not receive the retransmission / cyclic data indicated / reserved by the sending end (i.e., UE1), a confirmation message is sent again to prevent the sending end from not sending on the reserved resources due to other reasons (for example, receiving data with higher priority), which may cause the receiving end to wrongly trigger the SL beam failure.

[0169] As Figure 6 shown, the communication method may include the following steps in part or in whole:

[0170] S601: UE1 sends an SCI to UE2, and the SCI is used to indicate a first time-frequency resource, where the first time-frequency resource includes the retransmission resource of the first data and / or the cyclic resource of the first data.

[0171] Exemplarily, for the specific implementation of step S601, reference may be made to the above step S401, which will not be elaborated here.

[0172] S602: When UE2 does not receive data on part or all of the time-frequency resources of the first time-frequency resource, UE2 sends a beam failure confirmation message to UE1.

[0173] It should be understood that UE2 determines the retransmission resource and / or cyclic resource of UE1 according to the information indicated / reserved by UE1 in the SCI, and UE2 expects to receive the data transmitted by UE1 on the corresponding time-frequency resource (i.e., the first time-frequency resource). Exemplarily, if UE2 does not receive Figure 5A one or more of the reserved resources above, it triggers the SL beam failure judgment, that is, UE2 sends a beam failure confirmation message (i.e., the above second indication information) to UE1 at the feedback position corresponding to the time-frequency resource that has not been received.

[0174] Figure 7A is a schematic diagram of sending a beam failure confirmation message provided by the embodiments of the present application. As Figure 7A shown, if UE2 does not receive the R2 reserved by UE1, UE2 can send a beam failure confirmation message in the PSFCH at time slot t2.

[0175] Optionally, the resource mapping relationship of the PSFCH can be the same as that in (3) PSFCH in the above related art. To distinguish the PSFCH resources used for feedback HARQ from the existing ones, the PSFCH resources used to indicate beam failure confirmation information can use an additional bitmap.

[0176] Exemplarily, the following introduces three possible implementations for triggering the SL beam failure determination:

[0177] In one implementation, UE1 only indicates / reserves retransmission resources: If UE2 does not receive one or more of R1 and R2 and subsequent retransmission resources (in the prior art, UE can only indicate two retransmission resources in one transmission, but can continue to indicate new retransmission resources on the retransmission resources, such as R2), the SL beam failure determination is triggered. It should be noted that if UE2 has already fed back an ACK response to the data, that is, UE1 does not need to retransmit, the SL beam failure determination is not triggered.

[0178] In another implementation, UE1 only indicates / reserves periodic resources: If UE2 does not receive one or more of P1 and P2 and subsequent resources, the SL beam failure determination is triggered, where the number of non-received resources is determined by a threshold.

[0179] In yet another implementation, if UE1 indicates / reserves retransmission resources and periodic resources: If UE2 does not receive the data of one or more indicated / reserved resources, the SL beam failure determination is triggered, where the number of non-received resources is determined by a threshold.

[0180] S603: UE1 feeds back the beam failure confirmation information.

[0181] In one implementation, if UE1 receives the beam failure confirmation information, UE1 needs to send indication information within M time slots or within a time window in the SCI and / or MAC CE, indicating that UE1 does not have a beam failure due to other reasons for not sending R1 and R2 / P1 and P2. Where M is a positive integer.

[0182] Among them, the number of time slots and the position of the time window can be predefined, or configured, or pre-configured. It should be understood that "predefined" can be understood as defined by the standard, without the need for other device configurations (and the network device or other terminal devices cannot change it either), and it is information pre-recorded / written in the hardware and / or software of the terminal device itself (such as UE1 and UE2). "Configuration" is divided into network device configuration and terminal device configuration. If it is network device configuration, it can be changed through SIB or RRC signaling; if it is terminal device configuration, it can be changed according to PC5-RRC signaling. "Pre-configuration" can be understood as information pre-recorded / written in the hardware and / or software of the terminal device itself, determined by the device manufacturer at the factory, and can be changed through software or hardware.

[0183] S604: When UE2 does not receive feedback for the beam failure confirmation information, it triggers an SL beam failure.

[0184] In one implementation, after UE2 sends the beam failure confirmation information, if it does not receive the indication information from UE1 within M time slots or within a time window, UE2 triggers an SL beam failure.

[0185] S605: UE2 sends a CBD reference signal to UE1.

[0186] In one implementation, after UE2 triggers a beam failure, UE2 can use S-SSB or SL CSI-RS as the CBD reference signal (i.e., CBD RS) to send the CBD reference signal. For example, when UE2 sends S-SSB, it carries both SRC ID and DST ID at the same time, and UE1 determines that it is the CBD RS sent by UE2 based on SRC ID and DST ID. Another example is that UE2 can indicate in SCI / MAC CE that this RS is used for beam failure recovery.

[0187] S606: UE1 feeds back a first beam to UE2 based on the CBD reference signal.

[0188] Exemplarily, for the specific implementation of step S606, reference can be made to the above step S404, which will not be elaborated here.

[0189] S607: UE1 uses the first beam to send first data to UE2.

[0190] For ease of understanding, the following is through Figure 7B for the above Figure 6 specific process for illustration. Figure 7B is another schematic diagram of the beam failure recovery process provided by the embodiments of this application. As Figure 7B shown, UE2 makes a beam failure judgment and sends beam failure confirmation information according to the information indicated / reserved by UE1. If UE2 does not receive the indication information from UE1 within a certain time, it triggers an SL beam failure and triggers the sending of a CBD reference signal. UE1 measures the CBD reference signal to determine the first beam and gives feedback, and finally UE1 uses the first beam for data transmission.

[0191] The embodiments of this application determine whether an SL beam failure occurs based on the first time-frequency resource (i.e., the already reserved resource) and the beam failure confirmation process (i.e., the above steps S602 to S604). This method can avoid misjudgment caused by not sending data for other reasons through the beam failure confirmation process, and can also avoid resource waste caused by sending periodic reference signals.

[0192] The above content elaborates in detail the method provided in this application. To facilitate the implementation of the above solutions of the embodiments of this application, the embodiments of this application also provide corresponding devices or equipment.

[0193] This application divides the functional modules of the first terminal device and the second terminal device according to the above method embodiments. For example, each functional module can be corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of a software functional module. It should be noted that the division of modules in this application is illustrative, only a logical function division, and there can be other division methods in actual implementation. The following will be combined with Figures 8 to 10 Describe in detail the communication device of the embodiments of this application.

[0194] See Figure 8 , Figure 8 is a schematic structural diagram of the communication device provided by the embodiments of this application. As Figure 8 shown, the communication device may include a transceiver unit 10 and a processing unit 20.

[0195] In some embodiments of this application, the communication device may be the second terminal device shown above or a chip or circuit disposed in the second terminal device. That is, the communication device may be used to execute the steps or functions performed by the second terminal device in the above method embodiments.

[0196] In one design, the transceiver unit 10 is configured to: receive first indication information from a first terminal device, the first indication information being used to indicate a first time-frequency resource, the first time-frequency resource being used for the first terminal device to send first data; the processing unit 20 is configured to: when first data from the first terminal device is not received on at least one time-frequency resource in the first time-frequency resource, trigger a sidelink SL beam failure; the transceiver unit 10 is configured to: send a first reference signal; the first reference signal is used for beam failure recovery.

[0197] In a possible implementation manner, the at least one time-frequency resource is at least one retransmission resource of the first data; or, the at least one time-frequency resource is at least one periodic resource of the first data; or, the at least one time-frequency resource includes at least one retransmission resource of the first data and at least one periodic resource of the first data.

[0198] Exemplarily, the at least one time-frequency resource is N periodic resources of the first data, N being a positive integer; the processing unit 20 is configured to: when data from the first terminal device is not received on the N periodic resources, trigger an SL beam failure.

[0199] Exemplarily, N is an integer greater than 1, and the time interval between two adjacent periodic resources in the N periodic resources in the time domain is equal.

[0200] Exemplarily, at least one time-frequency resource is at least one retransmission resource for the first data; the processing unit 20 is configured to: trigger SL beam failure when data from the first terminal device is not received on one or two of the at least one retransmission resources.

[0201] In a possible implementation manner, the transceiver unit 10 is configured to: when data from the first terminal device is not received on at least one time-frequency resource, send second indication information to the first terminal device, where the second indication information is used to indicate that data has not been received on the at least one time-frequency resource; the processing unit 20 is configured to: trigger SL beam failure when third indication information from the first terminal device is not received within a first time period, where the third indication information is used to indicate that no beam failure has occurred.

[0202] In a possible implementation manner, the second indication information is sent through a first physical layer sidelink feedback channel PSFCH resource; the first PSFCH resource has the same time domain as the second PSFCH resource for hybrid automatic repeat request HARQ for feedback of the first data but different frequency domains.

[0203] Exemplarily, the start time and end time of the first time period are determined based on the time when the second indication information is sent and a time offset.

[0204] Exemplarily, the first reference signal is one of a sidelink synchronization signal block S-SSB, a sidelink channel state information reference signal SL CSI-RS, and a demodulation reference signal DMRS.

[0205] In the embodiments of the present application, the descriptions of the first indication information, the first time-frequency resource, etc. can refer to the introductions in the method embodiment shown above Figure 3 、 Figure 4 and Figure 6 and will not be elaborated herein one by one.

[0206] It can be understood that the specific descriptions of the transceiver unit 10 and the processing unit 20 shown in the embodiments of the present application are only examples. For the specific functions of the transceiver unit 10 and the processing unit 20 or the steps to be executed, etc., reference can be made to the above Figure 3 、 Figure 4 and Figure 6 shown method embodiments, which will not be elaborated herein. In addition, for the technical effects of the embodiments of the present application, refer to the technical effects in the foregoing Figure 3 、 Figure 4 and Figure 6 shown method embodiments. For the sake of brevity, they will not be repeated here.

[0207] Multiplex Figure 8, in some other embodiments of the present application, the communication device may be the first terminal device shown above, or a chip or circuit disposed in the first terminal device. That is, the communication device may be used to execute the steps or functions performed by the first terminal device in the above method embodiments.

[0208] In a design, the transceiver unit 10 is used to send first indication information to a second terminal device, the first indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to send first data; receive second indication information from the second terminal device, the second indication information is used to indicate that no data is received on at least one time-frequency resource not in the first time-frequency resource; send third indication information to the second terminal device during a first time period, the third indication information is used to indicate that no sidelink SL beam failure has occurred. In a possible implementation, the processing unit 20 is used to: determine the first time-frequency resource.

[0209] It can be understood that the specific descriptions of the transceiver unit 10 and the processing unit 20 shown in the embodiments of the present application are only examples. For the specific functions or steps performed by the transceiver unit 10 and the processing unit 20, reference may be made to the above Figure 3 , Figure 4 and Figure 6 shown method embodiments, which will not be elaborated here. In addition, for the technical effects of the embodiments of the present application, refer to the technical effects in the foregoing Figure 3 , Figure 4 and Figure 6 shown method embodiments. For the sake of brevity, they will not be repeated here.

[0210] The first terminal device and the second terminal device in the embodiments of the present application are introduced above. The possible product forms of the first terminal device and the second terminal device are introduced below. It should be understood that any product in any form that has the functions of the first terminal device or the second terminal device described above falls within the protection scope of the embodiments of the present application. It should also be understood that the following introduction is only for example, and does not limit the product forms of the communication device in the embodiments of the present application to this. Figure 8 In a possible implementation manner,

[0211] In a possible implementation, Figure 8In the communication device shown, the processing unit 20 may be one or more processors, and the transceiver unit 10 may be a transceiver, or the transceiver unit 10 may also be a sending unit and a receiving unit. The sending unit may be a transmitter, and the receiving unit may be a receiver. The sending unit and the receiving unit are integrated into one device, such as a transceiver. In the embodiments of the present application, the processor and the transceiver may be coupled, etc. The embodiments of the present application do not limit the connection manner of the processor and the transceiver. In the process of executing the above method, the process of sending information in the above method may be understood as the process of the processor outputting the above information. When outputting the above information, the processor outputs the above information to the transceiver for transmission by the transceiver. After the above information is output by the processor, other processing may be required before it reaches the transceiver. Similarly, the process of receiving information in the above method may be understood as the process of the processor receiving the input above information. When the processor receives the input information, the transceiver receives the above information and inputs it to the processor. Further, after the transceiver receives the above information, the above information may need to be processed otherwise before being input to the processor.

[0212] See Figure 9 , Figure 9 is another structural schematic diagram of the communication device provided by the embodiments of the present application. As Figure 9 shown, the communication device provided by the embodiments of the present application can be used to implement the method described in the above method embodiments, and reference can be made to the description in the above method embodiments. The communication device may be a first terminal device, a second terminal device, or a chip therein. Exemplarily, the communication device includes one or more processors 1001 and a transceiver 1002. The communication device may further include a memory 1003. In one implementation, the communication device further includes an input / output device ( Figure 9 not shown).

[0213] The processor 1001 is mainly used to process communication protocols and communication data, control the entire communication device, execute software programs, and process data of software programs. The memory 1003 is mainly used to store software programs and data. The transceiver 1002 may include a control circuit and an antenna. The control circuit is mainly used for the conversion between baseband signals and radio frequency signals and the processing of radio frequency signals. The antenna is mainly used to transmit and receive radio frequency signals in the form of electromagnetic waves. The input / output device, such as a touch screen, a display screen, a keyboard, etc., is mainly used to receive data input by the user and output data to the user.

[0214] After the communication device is powered on, the processor 1001 can read the software program in the memory 1003, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be wirelessly transmitted, after the processor 1001 performs baseband processing on the data to be transmitted, it outputs a baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and then transmits the radio frequency signal outward in the form of electromagnetic waves through the antenna. When data is sent to the communication device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 1001. The processor 1001 converts the baseband signal into data and processes the data.

[0215] In another implementation, the radio frequency circuit and the antenna can be set independently of the processor performing baseband processing. For example, in a distributed scenario, the radio frequency circuit and the antenna can be independent of the communication device and arranged in a remote manner.

[0216] Among them, the processor 1001, the transceiver 1002, and the memory 1003 can be connected through a communication bus.

[0217] Exemplarily, when the communication device is used to execute the steps, methods, or functions performed by the first terminal device in the above Figure 3 shown embodiment, the transceiver 1002 can be used to execute Figure 3 steps S301 and S303 in, and / or other processes of the technologies described herein.

[0218] Exemplarily, when the communication device is used to execute the steps, methods, or functions performed by the second terminal device in the above Figure 3 shown embodiment, the transceiver 1002 can be used to execute Figure 3 steps S301 and S303 in, and the processor 1001 can be used to execute Figure 3 S302 in, and / or other processes of the technologies described herein.

[0219] In any of the above implementation manners, the processor 1001 may include a transceiver for implementing receiving and sending functions. For example, the transceiver can be a transceiver circuit, or an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit for implementing receiving and sending functions can be separate or integrated together. The above transceiver circuit, interface, or interface circuit can be used for reading and writing code / data, or the above transceiver circuit, interface, or interface circuit can be used for signal transmission or transfer.

[0220] In any of the above implementations, the processor 1001 may store instructions, which may be computer programs. The computer programs run on the processor 1001, and may enable the communication device to perform the method described in the above method embodiment. The computer program may be fixed in the processor 1001, in which case the processor 1001 may be implemented by hardware.

[0221] In one implementation, the communication device may include a circuit that can implement the functions of sending or receiving or communicating in the aforementioned method embodiment. The processor and transceiver described in the present application can be implemented in an integrated circuit (IC), an analog IC, a radio frequency integrated circuit (RFIC), a mixed signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, etc. The processor and transceiver can also be manufactured using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), N-type metal oxide semiconductor (nMetal-oxide-semiconductor, NMOS), P-channel metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (bipolar junction transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

[0222] It is understandable that the communication device shown in the embodiment of the present application may also have Figure 9 The embodiments of the present application do not limit the number of components and the like. The methods executed by the processor and transceiver shown above are only examples, and the specific steps executed by the processor and transceiver can refer to the introduction of the above method embodiments.

[0223] In another possible implementation, Figure 9 The communication device shown may also include a processing unit, which may be one or more logic circuits, and the transceiver unit 10 may be an input / output interface, or a communication interface, or an interface circuit, or an interface, etc. Alternatively, the transceiver unit 10 may be a sending unit and a receiving unit, the sending unit may be an output interface, the receiving unit may be an input interface, and the sending unit and the receiving unit may be integrated into one unit, such as an input / output interface.

[0224] See Figure 10 , Figure 10 which is another schematic structural diagram of the communication device provided by the embodiments of the present application. As Figure 10 shown, Figure 10 the communication device shown includes a logic circuit 901 and an interface 902. That is, the above-mentioned processing unit can be implemented by the logic circuit 901, and the transceiver unit 10 can be implemented by the interface 902. Among them, the logic circuit 901 can be a chip, a processing circuit, an integrated circuit, or a system on chip (SoC) chip, etc., and the interface 902 can be a communication interface, an input / output interface, a pin, etc. Exemplarily, Figure 10 is shown taking the above-mentioned communication device as a chip as an example. The chip includes a logic circuit 901 and an interface 902.

[0225] In the embodiments of the present application, the logic circuit and the interface can also be coupled to each other. For the specific connection manner between the logic circuit and the interface, the embodiments of the present application do not make any limitations.

[0226] Exemplarily, when the communication device is used to execute the steps, methods, or functions executed by the first terminal device in the method embodiment shown above Figure 3 , the logic circuit 901 is used to determine the first indication information; the interface 902 is used to send the first indication information.

[0227] Exemplarily, when the communication device is used to execute the steps, methods, or functions executed by the second terminal device in the method embodiment shown above Figure 3 , the logic circuit 901 is used to trigger a sidelink SL beam failure when no first data from the first terminal device is received on at least one time-frequency resource in the first time-frequency resource; the interface 902 is used to receive the first indication information.

[0228] In the embodiments of the present application, the descriptions of the first indication information, the first time-frequency resource, etc. can refer to the introductions in the method embodiments shown above Figure 3 , and will not be elaborated here one by one. It can be understood that the specific descriptions of the logic circuit 901 and the interface 902 can also refer to the introductions of the processing unit and the transceiver unit shown Figure 8 , and will not be repeated here.

[0229] It can be understood that the communication device shown in the embodiments of the present application can implement the method provided by the embodiments of the present application in the form of hardware, or can also implement the method provided by the embodiments of the present application in the form of software, etc. The embodiments of the present application do not make any limitations in this regard.

[0230] For Figure 10 the specific implementation manners of the various embodiments shown, reference can also be made to the above-mentioned various embodiments, and will not be elaborated here.

[0231] An embodiment of the present application further provides a communication system, which includes a first terminal device and a second terminal device. The first terminal device and the second terminal device can be used to execute the method in any of the foregoing method embodiments ( Figure 3 、 Figure 4 and Figure 6 ).

[0232] In addition, the present application also provides a computer program, which is used to implement the operations and / or processes executed by the terminal device (such as the foregoing first terminal device and second terminal device) in the method provided by the present application.

[0233] The present application also provides a computer-readable storage medium, in which computer code is stored. When the computer code runs on a computer, the computer is caused to execute the operations and / or processes executed by the terminal device (such as the foregoing first terminal device and second terminal device) in the method provided by the present application.

[0234] The present application also provides a computer program product, which includes computer code or a computer program. When the computer code or the computer program runs on a computer, the operations and / or processes executed by the terminal device (such as the foregoing first terminal device and second terminal device) in the method provided by the present application are caused to be executed.

[0235] In several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed couplings or direct couplings or communication connections to each other can be indirect couplings or communication connections through some interfaces, devices or units, and can also be in electrical, mechanical or other forms of connection.

[0236] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the technical effects of the solution provided by the embodiments of the present application.

[0237] In addition, in each embodiment of the present application, each functional unit may be integrated into one processing unit, may exist physically alone for each unit, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0238] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product. The computer software product is stored in a readable storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The aforementioned readable storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0239] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A communication method, characterized in that, the method comprises: receiving first indication information from a first terminal device, the first indication information being used to indicate a first time-frequency resource for the first terminal device to send first data; when the first data from the first terminal device is not received on at least one time-frequency resource among the first time-frequency resources, triggering a sidelink (SL) beam failure; sending a first reference signal; the first reference signal is used for beam failure recovery.

2. The method according to claim 1, characterized in that, the at least one time-frequency resource is at least one retransmission resource of the first data; or, the at least one time-frequency resource is at least one periodic resource of the first data; or, the at least one time-frequency resource includes at least one retransmission resource of the first data and at least one periodic resource of the first data.

3. The method according to claim 2, characterized in that, the at least one time-frequency resource is N periodic resources of the first data, N being a positive integer, and when the first data from the first terminal device is not received on at least one time-frequency resource among the first time-frequency resources, triggering an SL beam failure includes: when the data from the first terminal device is not received on the N periodic resources, triggering the SL beam failure.

4. The method according to claim 3, characterized in that, N is an integer greater than 1, and the time intervals between two adjacent periodic resources in the time domain among the N periodic resources are all equal.

5. The method according to claim 2, characterized in that, the at least one time-frequency resource is at least one retransmission resource of the first data; and when the first data from the first terminal device is not received on at least one time-frequency resource among the first time-frequency resources, triggering an SL beam failure includes: when the data from the first terminal device is not received on one or two retransmission resources among the at least one retransmission resource, triggering the SL beam failure.

6. The method according to claim 1 or 2, characterized in that, when the first data from the first terminal device is not received on at least one time-frequency resource among the first time-frequency resources, triggering an SL beam failure includes: when the data from the first terminal device is not received on the at least one time-frequency resource, sending second indication information to the first terminal device, the second indication information being used to indicate that data has not been received on the at least one time-frequency resource; when the third indication information from the first terminal device indicating that no beam failure has occurred is not received within a first time period, triggering the SL beam failure.

7. The method according to claim 6, characterized in that, The second indication information is sent through a first physical layer sidelink feedback channel (PSFCH) resource; the first PSFCH resource has the same time domain as a second PSFCH resource for hybrid automatic repeat request (HARQ) feedback of the first data and a different frequency domain.

8. The method according to claim 6 or 7, wherein, the start time and end time of the first time period are determined based on the time when the second indication information is sent and a time offset.

9. The method according to any one of claims 1-7, wherein, the first reference signal is one of a sidelink synchronization signal block (S-SSB), a sidelink channel state information reference signal (SL CSI-RS), and a demodulation reference signal (DMRS).

10. A communication method, wherein, the method includes: sending first indication information to a second terminal device, the first indication information being used to indicate first time-frequency resources for sending first data; receiving second indication information from the second terminal device, the second indication information being used to indicate that data has not been received on at least one time-frequency resource not in the first time-frequency resources; sending third indication information to the second terminal device within a first time period, the third indication information being used to indicate that no sidelink (SL) beam failure has occurred.

11. A communication device, wherein, it includes a module or unit for performing the method according to any one of claims 1 to 10.

12. A communication device, wherein, it includes a processor and an interface circuit. The interface circuit is used to receive signals from other communication devices and transmit them to the processor or send signals from the processor to other communication devices. The processor is used to implement the method according to any one of claims 1 to 10 through logic circuits or by executing code instructions.

13. A readable storage medium, wherein, it is used to store a program, and the program is executed by one or more processors, so that a device including the one or more processors executes the method according to any one of claims 1 to 10.

14. A communication system, wherein, it includes: a second terminal device for performing the method according to any one of claims 1 to 9, and a first terminal device for performing the method according to claim 10.

Images