Method, apparatus, terminal and network device for sidelink beam failure recovery

Abstract

The application provides a sidelink beam failure recovery method and device, a terminal and a network device. The method comprises the following steps: a first terminal triggers a beam failure detection (BFD) when a BFD triggering condition is met or a network device instructs the first terminal to trigger the BFD; the first terminal receives a BFD reference signal sent by a second terminal and performs measurement; and if it is determined to perform a beam failure recovery process based on the measurement result of the BFD reference signal, the first terminal sends a beam failure recovery request message to the network device. The technical scheme of the application can effectively solve the problem of beam failure recovery between sidelink terminals, thereby better supporting beam communication between sidelink terminals.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and in particular to a method, apparatus, terminal, and network device for recovering from direct link beam failure. Background Technology

[0002] Sidelink (SL) communication in the FR2 (millimeter wave) band requires beamforming. However, due to the distributed communication characteristics of the sidelink and the different reference signal structure between the sidelink and the air interface (Uu), the existing air interface beam management mechanism is not applicable to the sidelink. Therefore, how to provide a new beam failure recovery mechanism for the sidelink is a technical problem that needs to be solved. Summary of the Invention

[0003] This invention provides a method, apparatus, terminal, and network device for recovering beam failures in a direct link, in order to solve the problem of beam failure recovery in a direct link.

[0004] In a first aspect, the present invention provides a method for recovering from a direct-link beam failure, applied to a first terminal, comprising: BFD is triggered when the beam failure detection (BFD) trigger condition is met or when the network device instructs the first terminal to trigger BFD. Receive the BFD reference signal sent by the second terminal and perform measurements; If the measurement results based on the BFD reference signal determine that beam failure recovery processing is required, a beam failure recovery request message is sent to the network device.

[0005] In some embodiments, the method further includes: Receive the candidate beam detection CBD reference signal sent by the second terminal and perform measurement; Based on the measurement results of the CBD reference signal, a beam report is sent to the second terminal, and new beam pair information is received from the second terminal or network device; or, based on the measurement results of the CBD reference signal, a beam report is sent to the network device, and new beam pair information is received from the network device or second terminal.

[0006] In some embodiments, the method further includes: Based on the BFD reference signal indication information sent by the network device, determine the transmission resources for the BFD reference signal; or, Based on beam failure configuration information or BFD reference signal configuration information configured at higher levels, determine the transmission resources for the BFD reference signal; or, Based on the interaction with the second terminal, the configuration information of the BFD reference signal of the second terminal is obtained; based on the configuration information of the BFD reference signal of the second terminal, the transmission resources of the BFD reference signal are determined; or, The transmission resources of the BFD reference signal are determined based on the set of periodic reference signals that have a quasi-co-located QCL relationship with either the Physical Direct Link Control Channel Demodulation Reference Signal PSCCH DMRS or the Physical Direct Link Shared Channel Demodulation Reference Signal PSSCH DMRS.

[0007] In some embodiments, the method further includes: Based on the CBD reference signal indication information sent by network devices, determine the transmission resources for the CBD reference signal; or, Based on the beam failure configuration information or CBD reference signal configuration information configured at higher levels, determine the transmission resources for the CBD reference signal; or, Based on the interaction with the second terminal, the configuration information of the CBD reference signal of the second terminal is obtained, and based on the configuration information of the CBD reference signal of the second terminal, the transmission resources of the CBD reference signal are determined.

[0008] In some embodiments, the method further includes: After BFD is triggered, a BFD trigger message is sent to the network device. The BFD trigger message contains one or more of the following: Identification information of the first terminal; The identification information of the second terminal; BFD instruction information; BFD reference signal configuration information.

[0009] Secondly, the present invention also provides a method for recovering from a direct-link beam failure, applied to a second terminal, comprising: Receive instruction information sent by network devices; Based on the instruction information, a BFD reference signal is sent to the first terminal.

[0010] In some embodiments, the method further includes: Based on the BFD reference signal indication information sent by the network device, determine the transmission resources for the BFD reference signal; or, Based on the beam failure configuration information or BFD reference signal configuration information configured at higher levels, the transmission resources of the BFD reference signal are determined.

[0011] In some embodiments, the method further includes: Receive beam failure recovery request messages sent by network devices; A CBD reference signal is sent to the first terminal based on the beam failure recovery request message.

[0012] In some embodiments, the method further includes: Based on the CBD reference signal indication information sent by network devices, determine the transmission resources for the CBD reference signal; or, Based on the beam failure configuration information or CBD reference signal configuration information of the higher-level configuration, the transmission resources of the CBD reference signal are determined.

[0013] In some embodiments, the method further includes: Receive a beam report sent by the first terminal, determine a new beam pair based on the beam report, and send the new beam pair information to the first terminal or network device; or, Receive beam reports from network devices, determine new beam pairs based on the beam reports, and send the new beam pair information to the first terminal or network device; or, Receive new beam pair information sent by network devices.

[0014] Thirdly, the present invention also provides a method for recovering from a direct-link beam failure, applied to a network device, comprising: Determine that the first terminal triggers BFD; Send instruction information to the second terminal, which instructs the second terminal to send a BFD reference signal to the first terminal.

[0015] In some embodiments, determining that the first terminal triggers BFD includes: After instructing the first terminal to trigger BFD, confirm that the first terminal has triggered BFD; or, Receive the BFD trigger message sent by the first terminal and determine that the first terminal has triggered BFD.

[0016] In some embodiments, the method further includes: Receive the beam failure recovery request message sent by the first terminal; Send a beam failure recovery request message to the second terminal.

[0017] In some embodiments, the method further includes: Receive beam reports sent by the first terminal; A new beam pair is determined based on the beam report, and the new beam pair information is sent to the first terminal and the second terminal; or, the beam report is sent to the second terminal.

[0018] In some embodiments, the method further includes: Send BFD reference signal indication information to the first terminal and the second terminal; and / or, Send CBD reference signal indication information to the first terminal and the second terminal.

[0019] Fourthly, the present invention provides a through-link beam failure recovery device, comprising: The triggering module is used to trigger BFD when the BFD triggering conditions are met or when the network device instructs the first terminal to trigger BFD. The first receiving module is used to receive the BFD reference signal sent by the second terminal and perform measurements. The first transmitting module is used to send a beam failure recovery request message to the network device if the measurement results based on the BFD reference signal determine that beam failure recovery processing is required.

[0020] Fifthly, the present invention also provides a through-link beam failure recovery device, comprising: The second receiving module is used to receive indication information sent by the network device; The second transmitting module is used to transmit a BFD reference signal to the first terminal based on the indication information.

[0021] Sixthly, the present invention also provides a through-link beam failure recovery device, comprising: The fifth determining module is used to determine whether the first terminal triggers BFD; The third transmitting module is used to send indication information to the second terminal, which instructs the second terminal to send a BFD reference signal to the first terminal.

[0022] In a seventh aspect, the present invention also provides a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the through-link beam failure recovery method as described in the first aspect above, or to implement the through-link beam failure recovery method as described in the second aspect above.

[0023] Eighthly, the present invention also provides a network device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the through-link beam failure recovery method as described in the third aspect above.

[0024] In a ninth aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the through-link beam failure recovery method as described in the first aspect above, or implements the through-link beam failure recovery method as described in the second aspect above, or implements the through-link beam failure recovery method as described in the third aspect above.

[0025] In a tenth aspect, the present invention also provides a computer program product, comprising a computer program that, when executed by a processor, implements the direct link beam failure recovery method as described in the first aspect above, or implements the direct link beam failure recovery method as described in the second aspect above, or implements the direct link beam failure recovery method as described in the third aspect above.

[0026] The present invention provides a method, apparatus, terminal, and network device for beam failure recovery in a direct link. The first terminal can trigger BFD (Band Failure Detection) when the BFD triggering conditions are met or when the network device instructs the first terminal to trigger BFD. This makes the failure recovery method more suitable for communication scenarios between mobile terminals in a direct link. After triggering BFD, the first terminal performs BFD-RS measurement. If beam failure recovery processing is determined based on the measurement results of the BFD reference signal, the first terminal sends a beam failure recovery request message to the network device. Through interaction with the network device, the problem of beam failure recovery between direct link terminals is effectively solved, thereby better supporting beam communication between direct link terminals. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in this invention or related technologies, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is one of the flowcharts illustrating the through-link beam failure recovery method provided by the present invention; Figure 2 These are example diagrams illustrating two beam report transmission methods provided by this invention; Figure 3 This is an example diagram of the transmitted beam report and received beam indication information provided by the present invention; Figure 4 This is the second flowchart of the through-link beam failure recovery method provided by the present invention; Figure 5 This is the third flowchart of the through-link beam failure recovery method provided by the present invention; Figure 6 This is an example flowchart of the interaction between the direct link terminal and the base station provided by the present invention; Figure 7 This is an example diagram of the beam failure recovery process provided by the present invention; Figure 8 This is an example diagram of the beam pair of the first terminal and the second terminal provided by the present invention; Figure 9 This is a flowchart illustrating the process of the first and second terminals acquiring new beam pair information provided by the present invention. Figure 10 This is one of the structural schematic diagrams of the through-link beam failure recovery device provided by the present invention; Figure 11 This is the second schematic diagram of the structure of the through-link beam failure recovery device provided by the present invention; Figure 12 This is the third schematic diagram of the structure of the through-link beam failure recovery device provided by the present invention; Figure 13 This is a schematic diagram of the terminal provided by the present invention; Figure 14 This is a schematic diagram of the network device provided by the present invention. Detailed Implementation

[0029] In this embodiment of the invention, the term "and / or" describes the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0030] In this embodiment of the invention, the term "multiple" refers to two or more, and other quantifiers are similar.

[0031] In the embodiments of this invention, the terms "first," "second," etc., are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of the invention can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, without limiting the number of objects; for example, the first object can be one or more.

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The technical solutions provided in this invention can be applied to a variety of systems. For example, applicable systems may include Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, Long Term Evolution Advanced (LTE-A) systems, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) systems, 5G New Radio (NR) systems and their evolved communication systems, and 6G (sixth generation mobile communication technology) systems. These systems may include terminal equipment and network equipment. The systems may also include a core network component, such as the Evolved Packet Core (EPC), 5G core network (5GC), and 6G core network.

[0034] The terminal involved in this invention can be a device that provides voice and / or data connectivity to a user, such as a handheld device with wireless connectivity, a vehicle device, or other processing device connected to a wireless modem. The name of the terminal may differ in different systems; for example, in a 5G system, the terminal can be called a User Equipment (UE). The wireless terminal device can communicate with one or more core networks (CNs) via a Radio Access Network (RAN). The wireless terminal device can be a mobile terminal device, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal device, for example, a portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted mobile device that exchanges voice and / or data with the RAN. Examples include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). Wireless terminal equipment can also be referred to as a system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, remote terminal, access terminal, user terminal, user agent, or user device, but is not limited to these terms in this embodiment of the invention.

[0035] The network device involved in this embodiment of the invention can be a base station, which may include multiple cells providing services to terminals. Depending on the specific application, the base station may also be called an access point, or a device in the access network that communicates with wireless terminal devices through one or more sectors on the air interface, or other names. The network device can be used to exchange received air frames with Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network device can also coordinate the attribute management of the air interface. For example, the network equipment involved in the embodiments of this invention can be a Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), a Base Station (NodeB) in Wide-band Code Division Multiple Access (WCDMA), an Evolutionary Node B (eNB or e-NodeB) in a Long Term Evolution (LTE) system, a 5G Base Station (gNB) in a next-generation 5G network architecture, a Home Evolved Node B (HeNB), a relay node, a femto, a pico, etc., and is not limited in the embodiments of this invention. In some network structures, the network equipment may include Centralized Unit (CU) nodes and Distributed Unit (DU) nodes, and the Centralized Unit and Distributed Unit may also be geographically separated.

[0036] To facilitate a clearer understanding of the technical solutions of the various embodiments of the present invention, some technical contents related to the present invention will be introduced first.

[0037] In NR Uu, the Beam Failure Recovery (BFR) process includes the Beam Failure Detection (BFD) process, the Beam Failure Recovery Request (BFR reQuest, BFRQ) process, and the Beam Failure Recovery Response (BFR Response, BFRR) process.

[0038] In NR Uu, beam failure detection is achieved by the UE detecting periodic BFD reference signals (RS). BFD-RS can be, for example, Channel State Information-Reference Signals (CSI-RS) or Synchronization Signal and PBCH Blocks (SSBs). When the UE is configured with the higher-layer parameter Beam-Failure-Detection-RS-ResourceConfig, the set of periodic CSI-RS resource indices configured by the higher-layer signaling is the BFD-RS set. When the UE is not configured with the Beam-Failure-Detection-RS-ResourceConfig higher-layer parameter, the BFD-RS set is determined to be the periodic CSI-RS or SSB that satisfies a quasi-co-location (QCL) relationship with the demodulation reference signals (DMRS) of the Physical Downlink Control Channel (PDCCH) being monitored by the UE. The UE high-layer configuration parameters are set to the maximum number of beam failure instances and the beam failure detection timer. The beam failure instance counter BFI_COUNTER is started. The beam failure detection process is as follows: (1) Trigger BFR.

[0039] Initialize BFI_COUNTER = 0; When the UE detects that the quality of all BFD-RS signals (L1-RSRP / L1-SINR) is lower than the threshold Qout_LR, the PHY layer reports a beam failure instance indication to the MAC layer, BFI_COUNTER +1, and the MAC layer starts a BFD-timer; If the MAC layer receives a beam failure instance indication within this BFD-Timer time window, BFI_COUNTER +1, and the BFD-Timer is restarted. ... When the number of beam failure instances exceeds the threshold (BFI_COUNTER is greater than or equal to the maximum number of beam failure instances), the BFR process is considered to be triggered.

[0040] In various embodiments of the present invention, L1-RSRP refers to the Layer 1 (L1) Reference Signal Receiving Power (RSRP), and L1-SINR refers to the Layer 1 Signal to Interference plus Noise Ratio (SINR).

[0041] The PHY layer refers to the Physical (PHY) layer, and the MAC layer refers to the Media Access Control (MAC) layer.

[0042] (2) No beam failure recovery was triggered.

[0043] Initialize BFI_COUNTER = 0; When the UE detects that the quality of all BFD-RS signals (L1-RSRP / L1-SINR) is lower than the threshold Qout_LR, the PHY layer reports a beam failure instance indication to the MAC layer, BFI_COUNTER +1, and the MAC layer starts a BFD-timer; If the MAC layer receives a beam failure instance indication within this BFD-Timer time window, BFI_COUNTER +1, and the BFD-Timer is restarted. ... When the BFD-Timer times out and the MAC layer still has not received a beam failure instance indication, BFI_COUNTER is initialized to 0.

[0044] If the BFD procedure triggers beam failure recovery, the UE selects a new candidate beam by detecting the Candidate Beam Detection-Reference Signal (CBD-RS) (such as SSBs) and reports the BFRQ and the newly selected TX beam (transmit beam) to the base station through the corresponding Physical Random Access Channel (PRACH) resource. Then, the UE listens for the BFRR sent by the base station in the specific SS (specific search space, configured by recoverySearchSpaceId). When the UE receives the BFRR, it considers that the beam failure event and the new candidate beam have been correctly received by the base station.

[0045] Due to the distributed communication characteristics of the through link and the different reference signal structure compared to Uu, the existing Uu beam management mechanism is not applicable to the through link. Therefore, it is necessary to design a beam management mechanism in SL communication to ensure that through link devices can communicate via beams in FR2.

[0046] Figure 1 This is one of the flowcharts illustrating the through-link beam failure recovery method provided by the present invention. This method is applied to a first terminal, such as... Figure 1 As shown, the method includes the following steps 101, 102 and 103.

[0047] Step 101: Trigger BFD if the beam failure detection (BFD) trigger condition is met or if the network device instructs the first terminal to trigger BFD.

[0048] Step 102: Receive the BFD reference signal sent by the second terminal and perform measurement.

[0049] Step 103: If the measurement results based on the BFD reference signal determine that beam failure recovery processing is required, then send a beam failure recovery request message to the network device.

[0050] Specifically, the direct link beam failure recovery method provided by the present invention is a beam failure recovery method between a first terminal and a second terminal implemented with the participation of network equipment (e.g., a base station).

[0051] Unlike NR Uu, where BFD is implemented through the UE's detection of periodic BFD-RS, this embodiment of the invention proposes a design scheme for the first terminal to trigger BFD under certain conditions for the direct link communication scenario. For example, the first terminal triggers BFD only when it determines that it meets the predefined BFD triggering conditions or the network device instructs the first terminal to trigger BFD. This design is more suitable for the communication scenario between mobile terminals in the direct link.

[0052] After the first terminal triggers BFD, the network device instructs the second terminal to send BFD-RS to the first terminal. The first terminal receives the BFD-RS and performs measurements, executing the beam failure detection process. If the first terminal determines to enter the beam failure recovery process based on the measurement results of the BFD-RS, it can send a BFRQ message to the network device to perform beam recovery.

[0053] In some embodiments, the BFRQ message carries at least one of the following: the identifier (ID) information of the first terminal, the ID information of the second terminal, and a beam failure event indication (optionally, 0 or 1 indicates whether the beam failure recovery state has been entered).

[0054] The direct link beam failure recovery method provided by this invention allows the first terminal to trigger BFD when the BFD triggering conditions are met or when the network device instructs the first terminal to trigger BFD. This makes the failure recovery method more suitable for communication scenarios between mobile terminals in a direct link. After triggering BFD, the first terminal performs BFD-RS measurement. If beam failure recovery processing is determined based on the measurement results of the BFD reference signal, the first terminal sends a beam failure recovery request message to the network device. Through interaction with the network device, the problem of beam failure recovery between direct link terminals is effectively solved, thereby better supporting beam communication between direct link terminals.

[0055] In some embodiments, the BFD triggering conditions include one or more of the following: (1) The state of the first terminal changes.

[0056] For example, the first terminal may rotate or its motion state may change.

[0057] (2) All measured values ​​of the first beam reference signal are lower than the first threshold, or the proportion of beam reference signals with measured values ​​lower than the first threshold in the first beam reference signal is greater than the first threshold. The first beam reference signal includes at least one beam reference signal sent by the second terminal to the first terminal.

[0058] For example, during beam maintenance, the second terminal sends at least one beam reference signal to the first terminal. When the measured values ​​of all beam reference signals are lower than a first threshold (high-level parameter configuration or pre-configuration), or when the proportion of beam reference signals lower than the first threshold is higher than a first threshold (high-level parameter configuration or pre-configuration), the first terminal determines to trigger BFD.

[0059] (3) The first terminal receives N negative ACK knowledge (NACK) signals consecutively, or the first terminal meets the first condition N times consecutively, or the first terminal meets the first condition a certain number of times within a first time period; the first condition includes receiving a NACK signal or being in a discontinuous transmission (DTX) state, where N is an integer greater than 1.

[0060] For example, the first terminal can initialize a timer (timer=0) and two counters (counter1=0, counter2=0).

[0061] In some implementations, the timer starts counting, and the counter1 value is incremented by 1 when a NACK signal is received. If an ACK (acknowledgment) signal is received during this process, and the counter1 value is ≥ N while the timer is ≤ T1, then beam failure detection is considered triggered; otherwise, the counter1 value is reset to 0. When the timer reaches the configured value T1, if the counter1 value is ≥ N at this time, then beam failure detection is considered triggered; otherwise, it is not considered triggered.

[0062] In some implementations, the timer starts counting, and when a NACK signal is received or the system is in DTX state, the counter1 value is incremented by 1. If an ACK signal is received during this process, and the counter1 value is ≥ N and timer ≤ T1, beam failure detection is considered triggered; otherwise, the counter1 value is reset to 0. When the timer reaches the configured value T1, if the counter1 value is ≥ N at this time, beam failure detection is considered triggered; otherwise, it is not considered triggered.

[0063] In some implementations, the timer starts counting, and when a NACK signal is received or the system is in DTX state, the value of counter1 is incremented by 1; when an ACK signal is received during this process, the value of counter2 is incremented by 1. When the timer reaches the configured value T1, if the value of counter1 / (counter1+counter2) is greater than or equal to the threshold M, then beam failure detection is considered triggered; otherwise, it is not considered triggered.

[0064] In some embodiments, the network device instructs the first terminal to trigger BFD. This can be achieved by the network device determining, during beam maintenance, that the first terminal needs to trigger BFD based on certain information, and then sending an instruction signaling to the first terminal to instruct it to trigger BFD. For example, during beam maintenance, the network device may determine that the first terminal needs to enter the beam failure detection process based on information carried in the beam report reported by the first terminal (e.g., RSRP values ​​carried in the beam report are all below a threshold), or based on the location information of the first and second terminals (e.g., the base station detects a significant change in the location information of the first and second terminals), and then instruct the first terminal to trigger BFD.

[0065] In some embodiments, after the network device instructs the first terminal to trigger BFD, and determines that the first terminal has triggered BFD, it can send indication information to the second terminal, instructing the second terminal to send BFD-RS to the first terminal. This indication information can be a standalone indication information or BFD-RS indication information, that is, indication information used to indicate BFD-RS resource information.

[0066] In some embodiments, the method further includes: after the first terminal triggers BFD, sending a BFD trigger message to the network device, wherein the BFD trigger message includes one or more of the following: identification information of the first terminal; identification information of the second terminal; BFD indication information; and BFD reference signal configuration information.

[0067] For example, if the first terminal meets the BFD triggering conditions, it determines that BFD has been triggered and then sends a BFD trigger message to the network device, notifying the network device that the first terminal has triggered BFD. Upon receiving this BFD trigger message, the network device confirms that the first terminal has triggered BFD and can then send indication information to the second terminal, instructing the second terminal to send BFD-RS to the first terminal. This indication information can be a standalone indication message or a BFD-RS indication message, i.e., indication information used to indicate BFD-RS resource information.

[0068] Among them, the BFD indication information is used to indicate that the first terminal has triggered BFD.

[0069] When the first terminal reports BFD reference signal configuration information, the network device can select BFD-RS resources based on the BFD-RS configuration information reported by the first terminal, and then notify the first terminal and the second terminal of the BFD-RS resource information.

[0070] If the first terminal does not report BFD-RS configuration information, the network device can configure BFD-RS and notify the first and second terminals of BFD-RS resource information.

[0071] In some embodiments, the method further includes: Receive the CBD reference signal sent by the second terminal and perform measurements; Based on the measurement results of the CBD reference signal, a beam report is sent to the second terminal, and new beam pair information is received from the second terminal or network device; or, based on the measurement results of the CBD reference signal, a beam report is sent to the network device, and new beam pair information is received from the network device or second terminal.

[0072] Specifically, after the first terminal sends a BFRQ message to the network device, the network device can send the BFRQ message to the second terminal to trigger the second terminal to send a CBD-RS to the first terminal. The first terminal performs candidate beam detection, measures the CBD-RS sent by the second terminal, and sends a beam report to the second terminal or the network device based on the measurement results of the CBD-RS to obtain new beam pair information.

[0073] Figure 2 These are example diagrams illustrating two beam report transmission methods provided by this invention, such as... Figure 2As shown, the base station instructs the first and second terminals via downlink transmission on the location of time-frequency resources allocated for CBD-RS transmission and / or the location of time-frequency resources allocated for beam reporting, and activates the second terminal to transmit CBD-RS. The first terminal measures the received CBD-RS and transmits the beam measurement results of at least one beam with good measurement results to the second terminal via beam reporting resources (e.g., ...). Figure 2 (a) in the text), or send a beam report to the base station (such as... Figure 2 (b) in the middle.

[0074] In some implementations, the first terminal sends a beam report to the second terminal, which can select a new beam pair based on the beam report and then send the new beam pair information to the first terminal, or send the new beam pair information to a network device, which then sends it to the first terminal.

[0075] In some implementations, the first terminal sends a beam report to the network device, which can select a new beam pair based on the beam report and then send the new beam pair information to the first terminal and the second terminal. Alternatively, the network device can send the beam report to the second terminal, which can select a new beam pair based on the beam report and then send the new beam pair information to the first terminal. Or, the network device can send the new beam pair information to the network device, which then sends it to the first terminal.

[0076] The new beam pair information sent by the network device to the first terminal can be carried through a BFRR message or indicated through beam indication information.

[0077] The new beam pair information sent from the second terminal to the first terminal can be carried via a BFRR message or indicated via beam indication information. It should be noted that in this case, since the first terminal cannot obtain the specific time-frequency location information of the beam indication, it needs to perform beam scanning with the received beam in the beam pair carried in the beam report within a certain time period T2 after sending the beam report (e.g., this time period T2 is equal to the latency bound of the feedback, configured or pre-configured by higher-layer parameters) until it receives the BFRR message or beam indication information from the second terminal.

[0078] Figure 3 This is an example diagram of the transmitted beam report and received beam indication information provided by the present invention, such as... Figure 3 As shown, the first terminal can perform beam scanning with the receiving beam in the beam pair carried in the beam report within a certain time period T2 (where T2 = latency bound) after sending the beam report to the second terminal, until it receives beam indication information from the second terminal.

[0079] In some embodiments, the BFRR message or beam indication information includes at least one of the following: ID information of the first terminal, ID information of the second terminal, and new beam pair information (e.g., beam identification information, reference signal sequence information, etc.).

[0080] In some implementations, if the first terminal does not receive a BFRR message or beam indication information from the second terminal or network device within the aforementioned duration T2 (higher-layer parameter configuration or pre-configuration), it may selectively retransmit beam reports or BFRQ messages to the second terminal or network device in multiple beam directions. In some embodiments, a maximum number of retransmissions can be set.

[0081] In some embodiments, the method further includes: Based on the BFD reference signal indication information sent by the network device, determine the transmission resources for the BFD reference signal; or, Based on beam failure configuration information or BFD reference signal configuration information configured at higher levels, determine the transmission resources for the BFD reference signal; or, Based on the interaction with the second terminal, the configuration information of the BFD reference signal of the second terminal is obtained; based on the configuration information of the BFD reference signal of the second terminal, the transmission resources of the BFD reference signal are determined; or, Based on the set of periodic reference signals that have a QCL relationship with either the Physical Sidelink Control Channel (PSCCH) DMRS or the Physical Sidelink Shared Channel (PSSCH) DMRS, the transmission resources of the BFD reference signal are determined.

[0082] Specifically, before the first terminal measures the BFD-RS, it needs to determine the transmission resources of the BFD-RS (such as time domain resources, frequency domain resources, beam information, etc.). In this embodiment of the invention, the first terminal can determine the transmission resources of the BFD-RS in a variety of ways.

[0083] For example, a network device can send BFD-RS indication information to a first terminal, indicating BFD-RS resource information. In some implementations, the network device can carry BFD-RS indication information via Radio Resource Control (RRC) signaling to indicate BFD-RS resource information to the first terminal. As mentioned above, if the first terminal reports BFD reference signal configuration information, the network device can select BFD-RS resources based on the BFD-RS configuration information reported by the first terminal, and then send BFD-RS indication information to both the first and second terminals. Alternatively, the network device can configure BFD-RS and then send BFD-RS indication information to both the first and second terminals even if the first terminal has not reported BFD-RS configuration information.

[0084] For example, the first terminal can determine the BFD-RS transmission resources through the beam failure configuration information or BFD-RS configuration information pre-configured by the higher layer.

[0085] For example, during prior communication or beam maintenance, the first terminal can obtain the BFD-RS configuration information of the second terminal through interaction with the second terminal, and determine the BFD-RS transmission resources based on the obtained BFD-RS configuration information of the second terminal.

[0086] For example, the first terminal can use a set of periodic RSs that have a QCL relationship with PSCCH DMRS or PSSCH DMRS as BFD-RS, and determine the transmission resources of BFD-RS based on the transmission resources of the set of periodic RSs that have a QCL relationship with PSCCH DMRS or PSSCH DMRS.

[0087] In some embodiments, the method further includes: Based on the CBD reference signal indication information sent by network devices, determine the transmission resources for the CBD reference signal; or, Based on the beam failure configuration information or CBD reference signal configuration information configured at higher levels, determine the transmission resources for the CBD reference signal; or, Based on the interaction with the second terminal, the configuration information of the CBD reference signal of the second terminal is obtained, and based on the configuration information of the CBD reference signal of the second terminal, the transmission resources of the CBD reference signal are determined.

[0088] Specifically, similar to BFD-RS, before the first terminal measures CBD-RS, it needs to determine the transmission resources of CBD-RS (such as time domain resources, frequency domain resources, beam information, etc.). In this embodiment of the invention, the first terminal can determine the transmission resources of CBD-RS in a variety of ways.

[0089] For example, a network device can send CBD-RS indication information to a first terminal, indicating CBD-RS resource information. In some implementations, the network device can carry CBD-RS indication information via RRC signaling to indicate CBD-RS resource information to the first terminal. If the first terminal reports CBD reference signal configuration information, the network device can select CBD-RS resources based on the reported CBD-RS configuration information, and then send CBD-RS indication information to both the first and second terminals. Alternatively, the network device can configure CBD-RS and then send CBD-RS indication information to both the first and second terminals even if the first terminal has not reported CBD-RS configuration information.

[0090] For example, the first terminal can determine the CBD-RS transmission resources through the (pre-)configured beam failure configuration information or CBD-RS configuration information from the higher layer.

[0091] For example, during prior communication or beam maintenance, the first terminal can obtain the CBD-RS configuration information of the second terminal through interaction with the second terminal, and determine the CBD-RS transmission resources based on the obtained CBD-RS configuration information of the second terminal.

[0092] Figure 4 This is the second flowchart of the through-link beam failure recovery method provided by the present invention. This method is applied to a second terminal, such as... Figure 4 As shown, the method includes the following steps 401 and 402.

[0093] Step 401: Receive the instruction information sent by the network device.

[0094] Step 402: Send a BFD reference signal to the first terminal based on the instruction information.

[0095] Specifically, the direct link beam failure recovery method provided by the present invention is a beam failure recovery method between a first terminal and a second terminal implemented with the participation of network equipment (e.g., a base station).

[0096] Unlike NR Uu where BFD is implemented through the UE's detection of periodic BFD-RS, this embodiment of the invention proposes a design scheme for triggering BFD by the first terminal under certain conditions in a direct link communication scenario. After the first terminal triggers BFD, the network device sends an indication message to the second terminal, which instructs the second terminal to send BFD-RS to the first terminal. Thus, the first terminal can execute the beam failure detection process. If the first terminal determines to enter the beam failure recovery process based on the measurement result of BFD-RS, it can send a BFRQ message to the network device to perform beam recovery.

[0097] By interacting with network devices, the problem of beam failure recovery between direct link terminals is effectively solved, thereby better supporting beam communication between direct link terminals.

[0098] In some embodiments, the method further includes: Receive beam failure recovery request messages sent by network devices; A CBD reference signal is sent to the first terminal based on the beam failure recovery request message.

[0099] Specifically, after the first terminal sends a BFRQ message to the network device, the network device can send the BFRQ message to the second terminal to trigger the second terminal to send a CBD-RS to the first terminal. The first terminal performs candidate beam detection, measures the CBD-RS sent by the second terminal, and sends a beam report to the second terminal or the network device based on the measurement results of the CBD-RS to obtain new beam pair information.

[0100] In some embodiments, the method further includes: Receive a beam report sent by the first terminal, determine a new beam pair based on the beam report, and send the new beam pair information to the first terminal or network device; or, Receive beam reports from network devices, determine new beam pairs based on the beam reports, and send the new beam pair information to the first terminal or network device; or, Receive new beam pair information sent by network devices.

[0101] For example, the first terminal sends a beam report to the second terminal. The second terminal can select a new beam pair based on the beam report and then send the new beam pair information to the first terminal, or send the new beam pair information to the network device, which then sends it to the first terminal.

[0102] For example, the first terminal sends a beam report to the network device, which can then send the beam report to the second terminal. The second terminal selects a new beam pair based on the beam report and then sends the new beam pair information to the first terminal, or sends the new beam pair information to the network device, which then sends it to the first terminal.

[0103] For example, the first terminal sends a beam report to the network device, which can select a new beam pair based on the beam report and then send the new beam pair information to the first terminal and the second terminal.

[0104] In some embodiments, the method further includes: Based on the BFD reference signal indication information sent by the network device, determine the transmission resources for the BFD reference signal; or, Based on the beam failure configuration information or BFD reference signal configuration information configured at higher levels, the transmission resources of the BFD reference signal are determined.

[0105] Specifically, before the second terminal sends BFD-RS, it needs to determine the transmission resources of BFD-RS (such as time domain resources, frequency domain resources, beam information, etc.). In this embodiment of the invention, the second terminal can determine the transmission resources of BFD-RS in a variety of ways.

[0106] For example, a network device can send BFD-RS indication information to a second terminal, indicating BFD-RS resource information. In some implementations, the network device can carry BFD-RS indication information via RRC signaling to indicate BFD-RS resource information to the second terminal.

[0107] It should be noted that when the network device sends BFD-RS indication information to the second terminal to indicate BFD-RS resource information, the BFD-RS indication information can also be used to instruct the second terminal to send BFD-RS to the first terminal. That is, the BFD-RS indication information is the indication information in steps 401 and 402.

[0108] For example, the second terminal can determine the BFD-RS transmission resources through the beam failure configuration information or BFD-RS configuration information pre-configured by the higher layer.

[0109] In some embodiments, the method further includes: Based on the CBD reference signal indication information sent by network devices, determine the transmission resources for the CBD reference signal; or, Based on the beam failure configuration information or CBD reference signal configuration information of the higher-level configuration, the transmission resources of the CBD reference signal are determined.

[0110] Specifically, before the second terminal sends CBD-RS, it needs to determine the transmission resources of CBD-RS (such as time domain resources, frequency domain resources, beam information, etc.). In this embodiment of the invention, the second terminal can determine the transmission resources of CBD-RS in a variety of ways.

[0111] For example, a network device can send CBD-RS indication information to a second terminal, indicating CBD-RS resource information. In some implementations, the network device can carry CBD-RS indication information via RRC signaling to indicate CBD-RS resource information to the second terminal.

[0112] For example, the second terminal can determine the CBD-RS transmission resources through the (pre-)configured beam failure configuration information or CBD-RS configuration information from the higher layer.

[0113] Figure 5This is the third flowchart of the through-link beam failure recovery method provided by the present invention. This method is applied to network devices (e.g., base stations). Figure 5 As shown, the method includes the following steps 501 and 502.

[0114] Step 501: Determine that the first terminal triggers BFD.

[0115] Step 502: Send instruction information to the second terminal. The instruction information is used to instruct the second terminal to send a BFD reference signal to the first terminal.

[0116] Specifically, the direct link beam failure recovery method provided by the present invention is a beam failure recovery method between a first terminal and a second terminal implemented with the participation of network equipment (e.g., a base station).

[0117] Unlike NR Uu where BFD is implemented through the UE's detection of periodic BFD-RS, this embodiment of the invention proposes a design scheme for triggering BFD by the first terminal under certain conditions in a direct link communication scenario. After the network device determines that the first terminal has triggered BFD, it can send an indication message to the second terminal. This indication message instructs the second terminal to send BFD-RS to the first terminal, so that the first terminal can execute the beam failure detection process. If the first terminal determines to enter the beam failure recovery process based on the measurement result of BFD-RS, it can send a BFRQ message to the network device to perform beam recovery.

[0118] By interacting with network devices and direct link terminals, the problem of beam failure recovery between direct link terminals is effectively solved, thereby better supporting beam communication between direct link terminals.

[0119] In some embodiments, determining that the first terminal triggers BFD includes: After instructing the first terminal to trigger BFD, confirm that the first terminal has triggered BFD; or, Receive the BFD trigger message sent by the first terminal and determine that the first terminal has triggered BFD.

[0120] For example, during beam maintenance, the network device determines that the first terminal needs to enter the beam failure detection process based on information carried in the beam report reported by the first terminal (e.g., the RSRP values ​​carried in the beam report are all below the threshold), or based on the location information of the first and second terminals (e.g., the base station detects a significant change in the location information of the first and second terminals). If the network device then instructs the first terminal to trigger BFD, it can send an instruction to the second terminal, instructing the second terminal to send a BFD-RS to the first terminal.

[0121] For example, after the first terminal triggers BFD, it can send a BFD trigger message to the network device to notify the network device that the first terminal has triggered BFD. When the network device receives the BFD trigger message and confirms that the first terminal has triggered BFD, it can send an indication message to the second terminal to instruct the second terminal to send BFD-RS to the first terminal.

[0122] In some embodiments, the method further includes: Receive the beam failure recovery request message sent by the first terminal; Send a beam failure recovery request message to the second terminal.

[0123] Specifically, after the first terminal sends a BFRQ message to the network device, the network device can send the BFRQ message to the second terminal to trigger the second terminal to send a CBD-RS to the first terminal. The first terminal performs candidate beam detection, measures the CBD-RS sent by the second terminal, and sends a beam report to the second terminal or the network device based on the measurement results of the CBD-RS to obtain new beam pair information.

[0124] In some embodiments, the method further includes: Receive beam reports sent by the first terminal; A new beam pair is determined based on the beam report, and the new beam pair information is sent to the first terminal and the second terminal; or, the beam report is sent to the second terminal.

[0125] For example, the first terminal sends a beam report to the network device, which can select a new beam pair based on the beam report and then send the new beam pair information to the first terminal and the second terminal. Alternatively, the network device can send the beam report to the second terminal, which can select a new beam pair based on the beam report and then send the new beam pair information to the first terminal. Or, the network device can send the new beam pair information to the network device, which then sends it to the first terminal.

[0126] In some embodiments, the method further includes: Send BFD reference signal indication information to the first terminal and the second terminal; and / or, Send CBD reference signal indication information to the first terminal and the second terminal.

[0127] Specifically, before the first terminal measures BFD-RS, or before the second terminal sends BFD-RS, it is necessary to determine the transmission resources of BFD-RS (such as time domain resources, frequency domain resources, beam information, etc.). In some embodiments, the network device can send BFD-RS indication information to the first terminal and the second terminal to indicate the BFD-RS resource information, so that the first terminal and the second terminal can determine the transmission resources of BFD-RS based on the BFD-RS indication information.

[0128] Similarly, before the first terminal measures the CBD-RS, or before the second terminal sends the CBD-RS, it is necessary to determine the transmission resources of the CBD-RS (such as time domain resources, frequency domain resources, beam information, etc.). In some embodiments, the network device can send CBD-RS indication information to the first terminal and the second terminal to indicate the CBD-RS resource information, so that the first terminal and the second terminal can determine the transmission resources of the CBD-RS based on the CBD-RS indication information.

[0129] The methods provided in the various embodiments of the present invention are based on the same technical concept, so the implementation of each method can be referred to each other, and repeated parts will not be described again.

[0130] The following combination Figures 6-9 The present invention provides methods illustrated by examples.

[0131] Figure 6 This is an example flowchart of the interaction between the direct link terminal and the base station provided by the present invention, such as... Figure 6 As shown, the example process mainly includes: 1. The first terminal triggers BFD and sends a BFD trigger indication signaling (i.e., the BFD trigger message mentioned above) to the base station.

[0132] 2. The base station triggers the second terminal to send BFD-RS and the first terminal to receive BFD-RS.

[0133] 3. The first terminal executes the BFD process.

[0134] 4. Once the first terminal determines that it has entered BFR, it sends a BFRQ to the base station.

[0135] 5. The base station triggers the second terminal to send CBD-RS and the first terminal to receive CBD-RS.

[0136] 6. The first terminal executes the CBD process.

[0137] 7. The first terminal sends a beam report to the second terminal or the base station based on the CBD-RS measurement results. In some embodiments, the first terminal can send a beam report to the second terminal, the second terminal selects a new beam pair based on the beam report, and sends the new beam pair information to the base station via BFRR, which then sends the new beam pair information to the first terminal. In some embodiments, the first terminal can send a beam report to the base station, the base station selects a new beam pair based on the beam report, and then sends it to both the first and second terminals.

[0138] Figure 7 This is an example diagram of the beam failure recovery process provided by the present invention, such as... Figure 7 As shown, it mainly includes: 1. BFD Triggering. BFD can be triggered by the base station or by the first terminal.

[0139] 2. BFD Detection. BFD-RS resource information can be configured by the base station and notified to the first and second terminals, or the base station can select BFD-RS resources based on the BFD-RS configuration information reported by the first terminal and then notify the first and second terminals.

[0140] 3. Entering BFR. The first terminal determines that it has entered BFR and sends a BFRQ message to the base station. The base station can then send the BFRQ message to the second terminal.

[0141] 4. Candidate Beam Detection. CBD-RS resource information can be configured by the base station and notified to the first and second terminals, or the base station can select CBD-RS resources based on the CBD-RS configuration information reported by the first terminal and then notify the first and second terminals.

[0142] 5. Communication on the new beam. After receiving a beam report, the second terminal can select a new beam pair based on the beam report and then send a BFRR message or beam indication information to the first terminal. The BFRR message or beam indication information contains the new beam pair information. Alternatively, the second terminal can send BFRR or beam indication information to the base station, which will then send the new beam pair information to the first terminal. After obtaining the new beam pair information, the first terminal can resume SL communication with the second terminal on the new beam.

[0143] Example 1: Triggering conditions for beam failure recovery.

[0144] The first terminal measures the BFD-RS and triggers beam failure recovery when the following conditions are met: (1) Initialize the beam failure instance counter = 0. When a beam failure instance is detected, the beam failure detection timer starts counting and increments the beam failure instance counter by 1.

[0145] (2) If a beam failure instance is detected within the time window of the beam failure detection timer, the beam failure instance counter is incremented by 1 and the beam failure detection timer is restarted; otherwise, if no beam failure instance is detected after the beam failure detection timer expires, the beam failure instance counter is initialized to 0.

[0146] (3) When the number of beam failure instances exceeds the maximum number of beam failure instances, the beam failure recovery process is triggered.

[0147] Beam failure instances must satisfy at least one of the following conditions: When all BFD-RS signal quality (L1-RSRP / L1-SINR) detected by the first terminal is below the beam quality threshold; When the proportion of reference signals whose signal quality is lower than the beam quality threshold detected by the first terminal is higher than the beam failure instance threshold value X.

[0148] Example 2: BFD trigger message sent by the first terminal to the network device.

[0149] The BFD trigger message sent by the first terminal to the network device includes at least one of the following: BFD-RS configuration information; BFD instruction information; Beam measurement auxiliary information; Source ID, which is the identifier of the first terminal; Destination ID, which is the identifier of the second terminal; Zone ID; Beam priority information; The second-stage SCI format and time-frequency domain information; SCI refers to Sidelink Control Information. Modulation and coding methods; Modulation and Coding Scheme (MCS) table indication; Information related to Hybrid Automatic Repeat reQuest (HARQ); Reserve bit.

[0150] The BFD-RS configuration information includes at least one of the following: The time-domain location information of the reference signal; Frequency domain configuration information of the reference signal; Reference signal port number and sequence.

[0151] The time-domain location information of the reference signal includes at least one of the following: Reference signal time-domain pattern information; Reference signal time-domain start symbol position information; Reference signal time-domain symbol count information.

[0152] The frequency domain configuration information of the reference signal includes at least one of the following: Reference signal frequency domain pattern information; Reference signal frequency domain starting physical resource block (PRB) location information; Reference signal frequency domain start sub-channel position information; Information on the number of PRBs and / or the number of sub-channels occupied by the reference signal in the frequency domain; Reference signal frequency domain shift information (the number of PRBs offset relative to the frequency domain reference point).

[0153] The reference signal frequency domain pattern information includes at least one of the following: starting resource element (RE); comb size; comb offset; cyclic shift or orthogonal cover code (OCC).

[0154] The beam measurement auxiliary information includes at least one of the following: Beam index information: can be indicated by the reference signal port indicator field, or the reference signal sequence indicator, or a combination of port and sequence; Beam count information: the total number of different beam directions represented by the transmitted reference signal (the total number of narrow beams corresponding to the current wide beam), and the total number of different beam directions of the transmitted control channel (the total number of wide beams). Beam resource indication information: Resource indication information reserved by the current device for all transmitting beams; Beam report indication.

[0155] The beam reporting indication includes at least one of the following: Time interval (the time interval between the time-domain start transmission position of the beam report); Feedback delay limit; Time window information.

[0156] Example 3: Beam failure configuration information, BFD-RS configuration information, and CBD-RS configuration information.

[0157] Beam failure configuration information must include at least one of the following: Beam failure detection resources; Beam failure detection timer; Beam failure instance threshold X; Maximum number of beam failure instances; Beam failure recovery request transmission timer; Maximum number of retransmissions for beam failure recovery request; Beam failure recovery timer; Maximum number of beam failure recovery attempts; Beam quality threshold.

[0158] The BFD-RS configuration information and the CBD-RS configuration information each contain at least one of the following: Reference signal type; The time-domain location information of the reference signal; Frequency domain configuration information of the reference signal; Reference signal port number and sequence; Beam index information: can be indicated by the reference signal port indicator field, or the reference signal sequence indicator, or a combination of port and sequence.

[0159] The time-domain location information of the reference signal includes at least one of the following: Reference signal time-domain pattern information; Reference signal time-domain start symbol position information; Reference signal time-domain symbol count information.

[0160] The frequency domain configuration information of the reference signal includes at least one of the following: Reference signal frequency domain pattern information (start RE, comb size, comb offset, cyclic shift / OCC, etc.); Reference signal frequency domain start PRB position information; Reference signal frequency domain start sub-channel position information; Information on the number of PRBs and / or the number of sub-channels occupied by the reference signal in the frequency domain; Reference signal frequency domain shift information (the number of PRBs offset relative to the frequency domain reference point).

[0161] Example 4: During the prior communication process or beam maintenance process, the first terminal obtains the BFD-RS configuration information (or beam failure recovery configuration information) of the second terminal.

[0162] The acquisition method can be: the second terminal can actively send it to the first terminal, or it can send it to the first terminal upon request. The second terminal and the first terminal can exchange configuration information through at least one of the following messages: PC5 connection establishment message (or PC5 connection request message); PC5 connection establishment response message; PC5 bearer configuration message; PC5 bearer configuration response message; PC5 reconfiguration message; and direct link beam failure recovery configuration message.

[0163] The source of the second terminal's periodic BFD-RS includes at least one of the following: (1) During the initial beam pairing and beam maintenance process, the set of periodic reference signals of the candidate beam pairs obtained by the first terminal and the second terminal based on the beam measurement information is considered as the "first priority" candidate beam pair reference signal.

[0164] (2) The second terminal selects other “second priority” candidate beam pair reference signals that have not been obtained through beam measurement information, in addition to the candidate beam pair, based on the prior information of the beam between the two devices (the first terminal and the second terminal).

[0165] Figure 8 This is an example diagram of the beam pair of the first terminal and the second terminal provided by the present invention, as shown below. Figure 8 As shown, R1, R2, R3 and S1, S2, S3 are the "first priority" beam pairs obtained based on beam measurement information; S4, S5, S6 are the "second priority" beam pairs selected by the second terminal. The selection of "second priority" beam pairs is to provide more candidate beam pairs in more directions when the first or second terminal experiences beam failure due to position changes or self-rotation during movement, thereby reducing the likelihood of entering the beam failure recovery process.

[0166] Example 5: Beam report.

[0167] The first terminal measures the received CBD-RS signal and reports the beam measurement results of at least one (denoted as P) beams with good measurement results to the second terminal or base station through the CBD-RS beam reporting resource.

[0168] Beam quality can be detected based on the reference signal's RSRP, reference signal receiving quality (RSRQ), SINR, received signal strength indication (RSSI), and channel state information (CSI).

[0169] The beam selection rules indicated in the beam report must meet at least one of the following: ① the P beams with the highest quality; ② the P beams with quality higher than the threshold (high-level configuration or pre-configuration). If there are more than P beams, select the P beams with the best quality, or randomly select P beams; if there are no beams with quality higher than the threshold, remeasure, or select the P beams with the best quality to report.

[0170] The beam report must include at least one of the following: beam indication information (beam index, CRI); beam measurement information (RSRP, RSRQ, SINR, RSSI, CSI measurement results). CRI refers to the CSI-RS Resource Indicator.

[0171] The beam report bearer method includes at least one of the following: SL physical layer signaling (PSFCH, PSCCH, PSSCH: 2nd SCI); PSSCH: SL MAC-CE / PC5-RRC. Here, PSFCH refers to the Physical Sidelink Feedback Channel (PSFCH), and MAC-CE refers to the Media Access Control-Control Element (MAC-CE).

[0172] The beam report transmission resources are determined by at least one of the following methods: ① When the base station configures CBD-RS resources or activates CBD-RS transceiver for the first terminal and / or the second terminal through downlink transmission, it simultaneously indicates the beam report resources reserved for CBD-RS resources; ② The base station indicates the beam report resources to the first terminal and / or the second terminal through downlink transmission (different from ①, i.e. not for configuring CBD-RS); ③ The beam report is sent to the base station through uplink transmission.

[0173] Example 6: Implementation scheme for the first and second terminals to acquire information about the new beam pair.

[0174] Figure 9 This is a flowchart illustrating the process of the first and second terminals acquiring new beam pair information provided by the present invention, as shown below. Figure 9 As shown, the first terminal can send a beam report to the second terminal or to the base station.

[0175] When the first terminal sends a beam report to the second terminal: the second terminal can select a new beam pair from the beam report, and then send the new beam pair information to the first terminal via SL transmission, or send the new beam pair information to the base station via uplink transmission, and the base station sends it to the first terminal.

[0176] In the scenario where the first terminal sends a beam report to the base station: the base station can select a new beam pair from the beam report and then send the new beam pair information to the first terminal and the second terminal via downlink transmission; or, the base station can send the beam report to the second terminal, the second terminal can select a new beam pair from the beam report, and then send the new beam pair information to the first terminal via SL transmission, or send the new beam pair information to the base station via uplink transmission, and the base station will then send it to the first terminal.

[0177] The following describes the through-link beam failure recovery device provided by the present invention. The through-link beam failure recovery device described below and the through-link beam failure recovery method described above can be referred to in correspondence.

[0178] Figure 10 This is one of the structural schematic diagrams of the through-link beam failure recovery device provided by the present invention, such as... Figure 10 As shown, the device includes: Trigger module 1010 is used to trigger BFD when the BFD triggering condition is met or when the network device instructs the first terminal to trigger BFD; The first receiving module 1020 is used to receive the BFD reference signal sent by the second terminal and perform measurement; The first transmitting module 1030 is used to send a beam failure recovery request message to the network device if the measurement results based on the BFD reference signal determine that beam failure recovery processing is required.

[0179] In some embodiments, the device further includes a first new beam processing module: Receive the candidate beam detection CBD reference signal sent by the second terminal and perform measurement; Based on the measurement results of the CBD reference signal, a beam report is sent to the second terminal, and new beam pair information is received from the second terminal or network device; or, based on the measurement results of the CBD reference signal, a beam report is sent to the network device, and new beam pair information is received from the network device or second terminal.

[0180] In some embodiments, the device further includes a first determining module, configured to: Based on the BFD reference signal indication information sent by the network device, determine the transmission resources for the BFD reference signal; or, Based on beam failure configuration information or BFD reference signal configuration information configured at higher levels, determine the transmission resources for the BFD reference signal; or, Based on the interaction with the second terminal, the configuration information of the BFD reference signal of the second terminal is obtained; based on the configuration information of the BFD reference signal of the second terminal, the transmission resources of the BFD reference signal are determined; or, The transmission resources of the BFD reference signal are determined based on the set of periodic reference signals that have a quasi-co-located QCL relationship with either the Physical Direct Link Control Channel Demodulation Reference Signal PSCCH DMRS or the Physical Direct Link Shared Channel Demodulation Reference Signal PSSCH DMRS.

[0181] In some embodiments, the device further includes a second determining module, configured to: Based on the CBD reference signal indication information sent by network devices, determine the transmission resources for the CBD reference signal; or, Based on the beam failure configuration information or CBD reference signal configuration information configured at higher levels, determine the transmission resources for the CBD reference signal; or, Based on the interaction with the second terminal, the configuration information of the CBD reference signal of the second terminal is obtained, and based on the configuration information of the CBD reference signal of the second terminal, the transmission resources of the CBD reference signal are determined.

[0182] In some embodiments, the first sending module 1030 is further configured to: After BFD is triggered, a BFD trigger message is sent to the network device. The BFD trigger message contains one or more of the following: Identification information of the first terminal; The identification information of the second terminal; BFD instruction information; BFD reference signal configuration information.

[0183] Figure 11 This is the second schematic diagram of the structure of the through-link beam failure recovery device provided by the present invention, as shown below. Figure 11 As shown, the device includes: The second receiving module 1110 is used to receive indication information sent by the network device; The second transmitting module 1120 is used to transmit a BFD reference signal to the first terminal based on the indication information.

[0184] In some embodiments, the apparatus further includes a third determining module, configured to: Based on the BFD reference signal indication information sent by the network device, determine the transmission resources for the BFD reference signal; or, Based on the beam failure configuration information or BFD reference signal configuration information configured at higher levels, the transmission resources of the BFD reference signal are determined.

[0185] In some embodiments, The second receiving module 1110 is also used to: receive a beam failure recovery request message sent by the network device; The second sending module 1120 is also used to: send a CBD reference signal to the first terminal based on the beam failure recovery request message.

[0186] In some embodiments, the apparatus further includes a fourth determining module, configured to: Based on the CBD reference signal indication information sent by network devices, determine the transmission resources for the CBD reference signal; or, Based on the beam failure configuration information or CBD reference signal configuration information of the higher-level configuration, the transmission resources of the CBD reference signal are determined.

[0187] In some embodiments, the device further includes a second new beam processing module for: Receive a beam report sent by the first terminal, determine a new beam pair based on the beam report, and send the new beam pair information to the first terminal or network device; or, Receive beam reports from network devices, determine new beam pairs based on the beam reports, and send the new beam pair information to the first terminal or network device; or, Receive new beam pair information sent by network devices.

[0188] Figure 12 This is the third schematic diagram of the structure of the through-link beam failure recovery device provided by the present invention, as shown below. Figure 12 As shown, the device includes: The fifth determining module 1210 is used to determine whether the first terminal triggers BFD; The third transmitting module 1220 is used to send indication information to the second terminal, the indication information being used to instruct the second terminal to send a BFD reference signal to the first terminal.

[0189] In some embodiments, determining that the first terminal triggers BFD includes: After instructing the first terminal to trigger BFD, confirm that the first terminal has triggered BFD; or, Receive the BFD trigger message sent by the first terminal and determine that the first terminal has triggered BFD.

[0190] In some embodiments, the device further includes: The third receiving module is used to receive the beam failure recovery request message sent by the first terminal; The fourth sending module is used to send the beam failure recovery request message to the second terminal.

[0191] In some embodiments, the device further includes a beam reporting processing module for: Receive beam reports sent by the first terminal; A new beam pair is determined based on the beam report, and the new beam pair information is sent to the first terminal and the second terminal; or, the beam report is sent to the second terminal.

[0192] In some embodiments, the third sending module 1220 is further configured to: Send BFD reference signal indication information to the first terminal and the second terminal; and / or, Send CBD reference signal indication information to the first terminal and the second terminal.

[0193] It should be noted that the direct link beam failure recovery device provided by the present invention can realize all the method steps implemented in the above method embodiments and can achieve the same technical effect. Here, the parts that are the same as those in the method embodiments and the beneficial effects will not be described in detail.

[0194] Figure 13 This is a schematic diagram of the terminal provided by the present invention, as shown below. Figure 13 As shown, the terminal includes a memory 1320, a transceiver 1310, and a processor 1300; wherein the processor 1300 and the memory 1320 can also be physically arranged separately.

[0195] The memory 1320 is used to store computer programs; the transceiver 1310 is used to send and receive data under the control of the processor 1300.

[0196] Among them, Figure 13 In this context, the bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 1300 and memory represented by memory 1320 together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be further described here. The bus interface provides an interface. The transceiver 1310 can be multiple components, including a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium, including wireless channels, wired channels, optical fibers, etc. For different user equipment, the user interface 1330 can also be an interface capable of connecting external or internal devices, including but not limited to keypads, displays, speakers, microphones, joysticks, etc.

[0197] The processor 1300 is responsible for managing the bus architecture and general processing, while the memory 1320 can store the data used by the processor 1300 when performing operations.

[0198] The processor 1300 can be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD). The processor can also adopt a multi-core architecture.

[0199] The processor 1300 executes the through-link beam failure recovery method provided in the embodiments of the present invention by calling the computer program stored in the memory 1320 according to the obtained executable instructions.

[0200] Figure 14 This is a schematic diagram of the network device provided by the present invention, such as... Figure 14 As shown, the network device includes a memory 1420, a transceiver 1410, and a processor 1400; wherein the processor 1400 and the memory 1420 can also be physically arranged separately.

[0201] The memory 1420 is used to store computer programs; the transceiver 1410 is used to send and receive data under the control of the processor 1400.

[0202] Among them, Figure 14 In this context, the bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits together, such as one or more processors represented by processor 1400 and memory represented by memory 1420. The bus architecture can also link together various other circuits, such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be further described herein. A bus interface provides an interface. Transceiver 1410 can be multiple elements, including transmitters and receivers, providing a unit for communicating with various other devices over a transmission medium, including wireless channels, wired channels, optical fibers, and other transmission media.

[0203] The processor 1400 is responsible for managing the bus architecture and general processing, while the memory 1420 can store the data used by the processor 1400 when performing operations.

[0204] The processor 1400 can be a CPU, ASIC, FPGA or CPLD, and the processor can also adopt a multi-core architecture.

[0205] The processor 1400 executes any of the direct link beam failure recovery methods provided in this embodiment of the invention by calling a computer program stored in the memory 1420 according to the obtained executable instructions.

[0206] It should be noted that the terminal and network device provided by the present invention can implement all the method steps implemented in the above method embodiments and can achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiments will not be described in detail here.

[0207] On the other hand, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements any of the direct link beam failure recovery methods provided in the embodiments of the present invention on the first terminal side, any of the direct link beam failure recovery methods on the second terminal side, or any of the direct link beam failure recovery methods on the network device side.

[0208] In another aspect, the present invention also provides a computer program product, the computer program product including a computer program, which can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute any of the direct link beam failure recovery methods provided in the embodiments of the present invention on the first terminal side, any of the direct link beam failure recovery methods on the second terminal side, or any of the direct link beam failure recovery methods on the network device side.

[0209] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0210] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0211] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for recovering beam failure in a through-link, characterized in that, Applied to the first terminal, including: BFD is triggered when the beam failure detection (BFD) trigger condition is met or when the network device instructs the first terminal to trigger BFD. Receive the BFD reference signal sent by the second terminal and perform measurements; If beam failure recovery processing is determined based on the measurement results of the BFD reference signal, a beam failure recovery request message is sent to the network device.

2. The method for recovering beam failure in a direct link according to claim 1, characterized in that, The method further includes: Receive the candidate beam detection (CBD) reference signal sent by the second terminal and perform measurement; Based on the measurement results of the CBD reference signal, a beam report is sent to the second terminal, and new beam pair information is received from the second terminal or the network device; or, based on the measurement results of the CBD reference signal, a beam report is sent to the network device, and new beam pair information is received from the network device or the second terminal.

3. The method for recovering beam failure in a direct link according to claim 1, characterized in that, The method further includes: Based on the BFD reference signal indication information sent by the network device, determine the transmission resources of the BFD reference signal; or, Based on the beam failure configuration information or BFD reference signal configuration information configured at higher levels, the transmission resources of the BFD reference signal are determined; or, Based on the interaction with the second terminal, the configuration information of the BFD reference signal of the second terminal is obtained; based on the configuration information of the BFD reference signal of the second terminal, the transmission resources of the BFD reference signal are determined; or, The transmission resources of the BFD reference signal are determined based on a set of periodic reference signals that have a quasi-co-located QCL relationship with either the Physical Direct Link Control Channel Demodulation Reference Signal PSCCH DMRS or the Physical Direct Link Shared Channel Demodulation Reference Signal PSSCH DMRS.

4. The method for recovering beam failure in a direct link according to claim 2, characterized in that, The method further includes: Based on the CBD reference signal indication information sent by the network device, determine the transmission resources of the CBD reference signal; or, Based on the beam failure configuration information or CBD reference signal configuration information configured at higher levels, the transmission resources of the CBD reference signal are determined; or, Based on the interaction with the second terminal, the configuration information of the CBD reference signal of the second terminal is obtained, and based on the configuration information of the CBD reference signal of the second terminal, the transmission resources of the CBD reference signal are determined.

5. The method for recovering beam failure in a direct link according to claim 1 or 3, characterized in that, The method further includes: After BFD is triggered, a BFD trigger message is sent to the network device, the BFD trigger message containing one or more of the following: The identification information of the first terminal; The identification information of the second terminal; BFD instruction information; BFD reference signal configuration information.

6. A method for recovering from beam failure in a direct link, characterized in that, Applied to the second terminal, including: Receive instruction information sent by network devices; Based on the indicated information, a BFD reference signal is sent to the first terminal.

7. The method for recovering beam failure in a direct link according to claim 6, characterized in that, The method further includes: Based on the BFD reference signal indication information sent by the network device, determine the transmission resources of the BFD reference signal; or, Based on the beam failure configuration information or BFD reference signal configuration information configured at higher levels, the transmission resources of the BFD reference signal are determined.

8. The method for recovering beam failure in a direct link according to claim 6, characterized in that, The method further includes: Receive the beam failure recovery request message sent by the network device; Based on the beam failure recovery request message, a CBD reference signal is sent to the first terminal.

9. The method for recovering beam failure in a direct link according to claim 8, characterized in that, The method further includes: Based on the CBD reference signal indication information sent by the network device, determine the transmission resources of the CBD reference signal; or, Based on the beam failure configuration information or CBD reference signal configuration information of the higher-level configuration, the transmission resources of the CBD reference signal are determined.

10. The method for recovering beam failure in a direct link according to claim 8, characterized in that, The method further includes: Receive a beam report sent by the first terminal, determine a new beam pair based on the beam report, and send the new beam pair information to the first terminal or the network device; or, Receive a beam report sent by the network device, determine a new beam pair based on the beam report, and send the new beam pair information to the first terminal or the network device; or, Receive new beam pair information sent by the network device.

11. A method for recovering beam failure in a through-link, characterized in that, Applied to network devices, including: Determine that the first terminal triggers BFD; Send instruction information to the second terminal, the instruction information being used to instruct the second terminal to send a BFD reference signal to the first terminal.

12. The method for recovering beam failure in a direct link according to claim 11, characterized in that, The determination that the first terminal triggers BFD includes: After instructing the first terminal to trigger BFD, it is determined that the first terminal has triggered BFD; or, Receive the BFD trigger message sent by the first terminal and determine that the first terminal has triggered BFD.

13. The method for recovering beam failure in a direct link according to claim 11, characterized in that, The method further includes: Receive the beam failure recovery request message sent by the first terminal; The beam failure recovery request message is sent to the second terminal.

14. The method for recovering beam failure in a direct link according to claim 13, characterized in that, The method further includes: Receive the beam report sent by the first terminal; A new beam pair is determined based on the beam report, and the new beam pair information is sent to the first terminal and the second terminal; or, the beam report is sent to the second terminal.

15. The method for recovering beam failure in a direct link according to claim 11 or 13, characterized in that, The method further includes: Send BFD reference signal indication information to the first terminal and the second terminal; and / or, Send CBD reference signal indication information to the first terminal and the second terminal.

16. A through-link beam failure recovery device, characterized in that, include: The triggering module is used to trigger BFD when the BFD triggering conditions are met or when the network device instructs the first terminal to trigger BFD. The first receiving module is used to receive the BFD reference signal sent by the second terminal and perform measurements. The first transmitting module is configured to send a beam failure recovery request message to the network device if the measurement results based on the BFD reference signal determine that beam failure recovery processing is required.

17. A through-link beam failure recovery device, characterized in that, include: The second receiving module is used to receive indication information sent by the network device; The second transmitting module is used to transmit a BFD reference signal to the first terminal based on the indication information.

18. A through-link beam failure recovery device, characterized in that, include: The fifth determining module is used to determine whether the first terminal triggers BFD; The third sending module is used to send indication information to the second terminal, the indication information being used to instruct the second terminal to send a BFD reference signal to the first terminal.

19. A terminal, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the direct link beam failure recovery method as described in any one of claims 1 to 5, or the direct link beam failure recovery method as described in any one of claims 6 to 10.

20. A network device, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the through-link beam failure recovery method as described in any one of claims 11 to 15.

21. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the direct link beam failure recovery method as described in any one of claims 1 to 5, or the direct link beam failure recovery method as described in any one of claims 6 to 10, or the direct link beam failure recovery method as described in any one of claims 11 to 15.

22. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the direct link beam failure recovery method as described in any one of claims 1 to 5, or the direct link beam failure recovery method as described in any one of claims 6 to 10, or the direct link beam failure recovery method as described in any one of claims 11 to 15.

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