Beam failure recovery method and system and user equipment

Abstract

The invention relates to a beam failure recovery method and system and user equipment, and relates to the technical field of communication. The beam failure recovery method disclosed by the invention is executed by first user equipment, and comprises the following steps: sending a sidelink beam failure recovery request to second user equipment under the condition that sidelink beam failure is detected, the sidelink beam failure recovery request comprises sidelink beam failure indication information and indication information of candidate beams for sidelink beam failure recovery; and receiving a sidelink beam failure recovery response sent by the second user equipment to determine whether sidelink beam failure recovery is successful.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a beam failure recovery method, system and user equipment. Background Art

[0002] If UE (User Equipment) and UE use high frequency bands for near-field communication, the propagation loss of high frequency bands is large and the coverage is small. In order to compensate for the propagation loss of high frequency bands, beamforming technology is needed to enhance coverage. On the other hand, currently UE and UE can only use a single carrier for unicast near-field communication. In order to improve the near-field communication rate, 3GPP (3rd Generation Partnership Project) will consider allowing UE and UE to use multiple carriers simultaneously for unicast near-field communication.

[0003] Cellular communication (i.e., communication between UE and base station) supports beam failure recovery. Specifically, when UE detects beam failure, it evaluates the candidate beams that are suitable as the transmission beam and uses the beam to initiate a random access process to the base station. If the random access process is successful, the beam failure recovery is considered successful. However, the cellular communication beam failure recovery mechanism is not applicable to near-field communication (i.e., direct communication between UEs). Summary of the invention

[0004] The inventors have found that there is currently no signaling process suitable for beam failure recovery between UEs.

[0005] A technical problem to be solved by the present disclosure is to propose a beam failure recovery method between UEs to achieve beam failure recovery between UEs.

[0006] According to some embodiments of the present disclosure, a beam failure recovery method is provided, which is executed by a first user device, including: when a sidelink beam failure is detected, sending a sidelink beam failure recovery request to a second user device, wherein the sidelink beam failure recovery request includes: sidelink beam failure indication information and indication information of candidate beams for sidelink beam failure recovery; receiving a sidelink beam failure recovery response sent by the second user device to determine whether the sidelink beam failure recovery is successful.

[0007] In some embodiments, the sidelink beam failure indication information includes: one or more first fields, the first field is used to indicate whether a beam failure is detected on the corresponding sidelink frequency; and / or one or more second fields, the second field is used to indicate whether a beam failure is detected on the corresponding sidelink carrier.

[0008] In some embodiments, the indication information of the candidate beam for sidelink beam failure recovery includes at least one of the following: one or more first indications, the first indication is used to indicate whether the evaluation of the candidate beam on the corresponding sidelink frequency is completed; one or more first availability fields, the first availability field is used to indicate whether there is a candidate sidelink reference signal on the corresponding sidelink frequency whose reference signal received power RSRP exceeds the sidelink beam failure recovery RSRP threshold; one or more second indications, the second indication is used to indicate whether the evaluation of the candidate beam on the corresponding sidelink carrier is completed; one or more second availability fields, the second availability field is used to indicate whether there is a candidate sidelink reference signal on the corresponding sidelink carrier whose RSRP exceeds the sidelink beam failure recovery RSRP threshold.

[0009] In some embodiments, the sidelink beam failure indication information and the indication information of the candidate beam for sidelink beam failure recovery are jointly indicated using the same field.

[0010] In some embodiments, the indication information of the candidate beam for sidelink beam failure recovery also includes at least one of the following: an identification of a candidate sidelink reference signal whose RSRP on the corresponding sidelink frequency exceeds the sidelink beam failure recovery RSRP threshold; an identification of a candidate sidelink reference signal whose RSRP on the corresponding sidelink carrier exceeds the sidelink beam failure recovery RSRP threshold.

[0011] In some embodiments, the candidate sidelink reference signal comprises: a sidelink channel state information reference signal CSI-RS or a sidelink synchronization signal block SSB.

[0012] In some embodiments, the identification of the candidate sidelink reference signal includes: an index of a sidelink CSI-RS and / or an index of a sidelink SSB, wherein the index of the sidelink CSI-RS is an entry index corresponding to the sidelink CSI-RS in a configured sidelink candidate beam reference signal list, and the index of the sidelink SSB is an entry index corresponding to the sidelink SSB in a configured sidelink candidate beam reference signal list.

[0013] In some embodiments, the sidelink beam failure recovery request is transmitted via at least one of: sidelink control information SCI, radio resource control RRC message, medium access control MAC control element CE and physical sidelink feedback channel PSFCH.

[0014] In some embodiments, when a sidelink beam failure recovery response is received before a sidelink beam failure recovery response timer times out, it is determined that the sidelink beam failure recovery is successful.

[0015] In some embodiments, the method further includes: in a case where there is multi-carrier communication between the first user equipment and the second user equipment, and side link beam failure recovery of some carriers in the multiple carriers fails, sending information to the base station to indicate that side link beam failure recovery of some carriers has failed.

[0016] In some embodiments, when a side link beam failure recovery response is not received before the side link beam failure recovery response timer times out, it is determined that the side link beam failure recovery has failed; and the PC5 interface radio resource control RRC connection release is indicated to the upper layer.

[0017] In some embodiments, the method further includes: receiving configuration information, wherein the configuration information includes: sidelink beam failure detection configuration information and / or sidelink beam failure recovery configuration information.

[0018] In some embodiments, the sidelink beam failure recovery configuration information includes: indication information of candidate beams that can be used for sidelink beam failure recovery on one or more sidelink frequencies, and / or, indication information of candidate beams that can be used for sidelink beam failure recovery on one or more sidelink carriers.

[0019] In some embodiments, the indication information of candidate beams that can be used for sidelink beam failure recovery includes at least one of the following: a sidelink beam failure recovery reference signal received power RSRP threshold; one or more configured sidelink candidate beam reference signal lists.

[0020] In some embodiments, the configured sidelink candidate beam reference signal list includes: a sidelink CSI-RS resource ID and / or a sidelink SSB index.

[0021] In some embodiments, the sidelink beam failure recovery configuration information includes: a sidelink beam failure recovery response timer.

[0022] In some embodiments, the sidelink beam failure detection configuration information includes: a maximum number of beam failure instances corresponding to one or more sidelink frequencies; and / or a maximum number of beam failure instances corresponding to one or more sidelink carriers.

[0023] In some embodiments, the sidelink beam failure detection configuration information includes: indication information of a sidelink beam failure detection reference signal corresponding to one or more sidelink frequencies; and / or indication information of a sidelink beam failure detection reference signal corresponding to one or more sidelink carriers.

[0024] In some embodiments, the sidelink beam failure detection configuration information includes at least one of the following: an identifier of the sidelink frequency; an identifier of the sidelink carrier; an identifier of the sidelink beam failure detection reference signal corresponding to the sidelink frequency; an identifier of the sidelink beam failure detection reference signal corresponding to the sidelink carrier.

[0025] In some embodiments, the sidelink beam failure detection configuration information further includes: an identifier of the sidelink bandwidth portion.

[0026] In some embodiments, the sidelink beam failure detection configuration information includes: a sidelink beam failure detection timer.

[0027] In some embodiments, the configuration information also includes at least one of the following: a destination identifier corresponding to the sidelink beam failure detection configuration information; a source layer two identifier corresponding to the sidelink beam failure detection configuration information; a destination identifier corresponding to the sidelink beam failure recovery configuration information; a source layer two identifier corresponding to the sidelink beam failure recovery configuration information; a sidelink carrier identifier corresponding to the sidelink beam failure detection configuration information; a sidelink frequency identifier corresponding to the sidelink beam failure detection configuration information; a sidelink carrier identifier corresponding to the sidelink beam failure recovery configuration information; and a sidelink frequency identifier corresponding to the sidelink beam failure recovery configuration information.

[0028] In some embodiments, the method further includes: performing side link beam failure detection according to side link beam failure detection configuration information; and determining indication information of a candidate beam for side link beam failure recovery according to side link beam failure recovery configuration information.

[0029] In some embodiments, performing side link beam failure detection according to the side link beam failure detection configuration information includes: determining beam failure on the side link frequency when the beam failure instances reach the corresponding maximum number of beam failure instances for the side link frequency; and / or determining beam failure on the side link carrier when the beam failure instances reach the corresponding maximum number of beam failure instances for the side link carrier.

[0030] In some embodiments, receiving configuration information includes: receiving configuration information sent by a base station or a second user equipment, wherein the configuration information is transmitted through at least one of the following: sidelink control information SCI, radio resource control RRC message, media access control MAC control element CE and physical sidelink feedback channel PSFCH.

[0031] According to some other embodiments of the present disclosure, a user device is provided, as a first user device, comprising: a sending module, used for sending a side link beam failure recovery request to a second user device when a side link beam failure is detected, wherein the side link beam failure recovery request comprises: side link beam failure indication information and indication information of a candidate beam for side link beam failure recovery; a receiving module, used for receiving a side link beam failure recovery response sent by the second user device to determine whether the side link beam failure recovery is successful.

[0032] According to some further embodiments of the present disclosure, a user device is provided, comprising: a processor; and a memory coupled to the processor, for storing instructions, which, when executed by the processor, causes the processor to execute a beam failure recovery method as described in any of the aforementioned embodiments.

[0033] According to some further embodiments of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored, wherein the program, when executed by a processor, implements the steps of the method of any of the aforementioned embodiments.

[0034] According to some other embodiments of the present disclosure, a beam failure recovery system is provided, comprising: a user device of any of the aforementioned embodiments, serving as a first user device; and a second user device, configured to receive a sidelink beam failure recovery request sent by the first user device, and send a sidelink beam failure recovery response to the first user device, wherein the sidelink beam failure recovery request comprises: sidelink beam failure indication information and indication information of candidate beams for sidelink beam failure recovery.

[0035] In some embodiments, the second user equipment is further used to send configuration information to the first user equipment, wherein the configuration information includes: sidelink beam failure detection configuration information and / or sidelink beam failure recovery configuration information.

[0036] In some embodiments, the system further includes: a base station, configured to send configuration information to the first user equipment, wherein the configuration information includes: sidelink beam failure detection configuration information and / or sidelink beam failure recovery configuration information.

[0037] In some embodiments, the base station is also used to receive information sent by the first user equipment to indicate the failure of side link beam failure recovery of some carriers when there is multi-carrier communication between the first user equipment and the second user equipment and the side link beam failure recovery of some carriers in the multiple carriers fails.

[0038] In the present disclosure, the first user equipment detects a side link beam failure, and when the side link beam failure is detected, sends a side link beam failure recovery request to the second user equipment, and carries side link beam failure indication information and indication information of candidate beams for side link beam failure recovery in the side link beam failure recovery request. The first user equipment receives a side link beam failure recovery response sent by the second user equipment to determine whether the side link beam failure recovery is successful. The present disclosure proposes a solution for side link beam failure recovery signaling interaction between a UE and a peer UE, which solves the problem of multi-carrier near-domain communication beam failure recovery between UEs. The UE with a side link beam failure can select and use other suitable beams with the peer UE to promptly restore near-domain communication, thereby improving the efficiency and accuracy of side link beam failure recovery.

[0039] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 A schematic flow chart of a beam failure recovery method according to some embodiments of the present disclosure is shown.

[0042] Figure 2 A schematic flow chart of a beam failure recovery method according to some other embodiments of the present disclosure is shown.

[0043] Figure 3 A schematic diagram illustrating a beam failure recovery scenario according to some embodiments of the present disclosure.

[0044] Figure 4 A schematic diagram showing the structure of user equipment according to some embodiments of the present disclosure is shown.

[0045] Figure 5 A schematic diagram showing the structure of user equipment according to some other embodiments of the present disclosure.

[0046] Figure 6 A schematic diagram showing the structure of user equipment according to some further embodiments of the present disclosure is shown.

[0047] Figure 7 A schematic diagram showing the structure of a beam failure recovery system according to some embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0049] The technical solution disclosed in the present invention can be used in the scenario where beam failure occurs in single-carrier communication or multi-carrier communication between UEs. The communication link between UEs is called a sidelink (SL).

[0050] Figure 1 Flowcharts of some embodiments of the beam failure recovery method disclosed in the present invention. Figure 1 As shown, the method of this embodiment includes: steps S102 to S104.

[0051] In step S102, when detecting a side link beam failure, the first user equipment sends a side link beam failure recovery request to the second user equipment, and correspondingly, the second user equipment receives the side link beam failure recovery request sent by the first user equipment.

[0052] In some embodiments, a sidelink beam failure recovery request (Sidelink Beam FailureRecovery Request, SL BFRQ) includes: sidelink beam failure indication information and indication information of candidate beams for sidelink beam failure recovery.

[0053] In some embodiments, the sidelink beam failure recovery request is transmitted through at least one of the following: SCI (Sidelink control information), RRC (Radio Resource Control) message, MAC (Medium Access Control) CE (Control Element) and PSFCH (Physical Sidelink Broadcast Channel).

[0054] In some embodiments, the sidelink beam failure indication information includes: one or more first fields, the first field is used to indicate whether a beam failure is detected on the corresponding sidelink frequency; and / or one or more second fields, the second field is used to indicate whether a beam failure is detected on the corresponding sidelink carrier.

[0055] Each first field in one or more first fields can be used to indicate whether a beam failure is detected on the sidelink frequency corresponding to the first field. Each second field in one or more second fields can be used to indicate whether a beam failure is detected on the sidelink carrier corresponding to the second field. That is, the sidelink beam failure indication information may include one or more sidelink beam failure detection indications, each sidelink carrier / sidelink frequency corresponds to a sidelink beam failure detection indication, and the sidelink beam failure detection indication is used to indicate whether a beam failure is detected on the corresponding sidelink carrier / sidelink frequency.

[0056] In some embodiments, the indication information of the candidate beam for sidelink beam failure recovery includes at least one of the following: one or more first indications, the first indication is used to indicate whether the evaluation of the candidate beam on the corresponding sidelink frequency is completed; one or more first availability fields, the first availability field is used to indicate whether there is a candidate sidelink reference signal on the corresponding sidelink frequency whose RSRP (Reference Signal Received Power) exceeds the sidelink beam failure recovery RSRP threshold; one or more second indications, the second indication is used to indicate whether the evaluation of the candidate beam on the corresponding sidelink carrier is completed; one or more second availability fields, the second availability field is used to indicate whether there is a candidate sidelink reference signal on the corresponding sidelink carrier whose RSRP exceeds the sidelink beam failure recovery RSRP threshold.

[0057] In some embodiments, the sidelink beam failure indication information and the indication information of the candidate beam for sidelink beam failure recovery are jointly indicated using the same field.

[0058] For example, one or more first fields and one or more first indications may be represented by the same one or more fields or bits, and the one or more fields (or bits) may simultaneously indicate whether a beam failure is detected on the corresponding sidelink frequency and whether the evaluation of the candidate beams on the corresponding sidelink frequency is completed. The one or more fields may also be used to simultaneously indicate whether a first availability field corresponding to the corresponding sidelink frequency exists. Similarly, one or more first fields and one or more first indications may be represented by the same one or more fields or bits, and further indicate whether a second availability field corresponding to the sidelink carrier exists, which will not be repeated here.

[0059] In some embodiments, the indication information of the candidate beam for sidelink beam failure recovery also includes at least one of the following: an identifier of a candidate sidelink reference signal whose RSRP on the corresponding sidelink frequency exceeds the sidelink beam failure recovery RSRP threshold (SL-rsrp-ThresholdBFR); an identifier of a candidate sidelink reference signal whose RSRP on the corresponding sidelink carrier exceeds the sidelink beam failure recovery RSRP threshold.

[0060] The identity of the candidate sidelink reference signal whose RSRP exceeds the sidelink beam failure recovery RSRP threshold can be indicated for each sidelink frequency (or carrier).

[0061] For example, the candidate sidelink reference signal includes: sidelink CSI-RS or sidelink SSB (Synchronization Signal Block). Sidelink SSB can be SLSS (Sidelink Synchronization Signal) / PSBCH, that is, SLSS and Master Information Block Sidelink (sidelink master information block) message.

[0062] In some embodiments, the index of the sidelink CSI-RS and / or the index of the sidelink SSB, wherein the index of the sidelink CSI-RS is the entry index corresponding to the sidelink CSI-RS in the configured sidelink candidate beam reference signal list (SL-candidateBeamRSList), and the index of the sidelink SSB is the entry index corresponding to the sidelink SSB in the configured sidelink candidate beam reference signal list.

[0063] For example, the sidelink beam failure indication information and the indication information of the candidate beams for sidelink beam failure recovery are transmitted using a MAC CE (which may be referred to as a SL BFR MAC CE), which may include a bitmap and be arranged in ascending order based on the sidelink frequency (or carrier). The beam failure recovery information (indication information of the candidate beams for sidelink beam failure recovery), for example, contains an eight-bit byte of the candidate beam availability indication (AC) of the sidelink carrier (or frequency) indicated in the bitmap. For the sidelink BFR MAC CE, the bitmap may be used when a beam failure is detected on the highest sidelink frequency (or carrier) and the evaluation of the candidate beams is completed as required.

[0064] For example, the fields of SL BFR MAC CEs may include C i, which indicates the presence of BFD (Beam Failure Detection) for sidelink frequency (or carrier) i and an octet containing the AC field. For example, C i This field is set to 1 to indicate that a beam failure has been detected, the evaluation of candidate beams has been completed, and the octet containing the AC field is present for sidelink frequency (or carrier) i. i The field is set to 0 to indicate that no beam failure has been detected or that a beam failure has been detected but the evaluation of candidate beams as required has not been completed, and the octet containing the AC field is not present for sidelink frequency (or carrier) i.

[0065] For example, the fields of the SL BFR MAC CEs may include an AC (one or more first availability fields or one or more second availability fields) field. The AC field indicates the presence of the candidate SL RS ID field in the eight-bit byte. If at least one SL SSB with an RSRP higher than SL-rsrp-ThresholdBFR is available among the SL SSBs in the SL-candidateBeamRSList, or at least one SL CSI-RS with an RSRP higher than SL-rsrp-ThresholdBFR is available among the SL CSI-RS in the SL-candidateBeamRSList, the AC field is set to 1; otherwise, it is set to 0. If the AC field is set to 1, the candidate SL RS ID field exists.

[0066] For example, the fields of the SL BFR MAC CEs may include a Candidate SL RS ID field, which is set to the index of a SL SSB in the SL-candidateBeamRSList whose RSRP is higher than the SL-rsrp-ThresholdBFR, or is set to the index of a SL CSI-RS in the SL-candidateBeamRSList whose RSRP is higher than the SL-rsrp-ThresholdBFR. The index of the SL SSB or SL CSI-RS is the index of the entry in the SL-candidateBeamRSList corresponding to the SL SSB or SL CSI-RS. For example, index 0 corresponds to the first entry in the SL-candidateBeamRSList, index 1 corresponds to the second entry in the list, and so on.

[0067] The first user equipment selects a suitable candidate beam, and uses the beam to send a sidelink beam failure indication message to the second user equipment, including the index of the sidelink CSI-RS whose reference signal received power RSRP exceeds a threshold, or the index of the sidelink SSB whose RSRP exceeds a threshold, etc. For example, the MAC entity can configure each sidelink frequency / carrier through RRC during the sidelink beam failure recovery process, so as to indicate a new SLSSB or SL CSI-RS to the serving gNB (the next Generation Node B) or peer UE (peer UE) when a sidelink beam failure is detected on the serving SL SSB or SL CSI-RS (Channel State Information Reference Signal). The second user equipment can be informed of which sidelink carrier the beam failure occurred on and the suitable candidate beam evaluated by the first user equipment.

[0068] In step S104, the second user equipment sends a sidelink beam failure recovery response to the first user equipment, and correspondingly, the first user equipment receives the sidelink beam failure recovery response sent by the second user equipment.

[0069] The first user equipment may determine whether the sidelink beam failure recovery is successful through a sidelink beam failure recovery response (Sidelink Beam Failure Recovery Response, SL BFRR).

[0070] In some embodiments, when a sidelink beam failure recovery response is received before a sidelink beam failure recovery response timer times out, it is determined that the sidelink beam failure recovery is successful.

[0071] The sidelink beam failure recovery response may also include an index of a sidelink CSI-RS or a sidelink SSB, which may be used to indicate a frequency or carrier determined by the second user equipment for sidelink beam failure recovery.

[0072] In some embodiments, when a sidelink beam failure recovery response is not received before a sidelink beam failure recovery response timer times out, it is determined that a sidelink beam failure recovery has failed.

[0073] In some embodiments, upon determining that the sidelink beam failure recovery has failed, the first user equipment indicates to the upper layer that the PC5 interface radio resource control RRC connection has been released.

[0074] The upper layer includes, for example, the application layer, the V2X (Vehicle to everything) layer, the ProSe (Proximity Services) layer, and the NAS (Non-access stratum) layer.

[0075] In some embodiments, when there is multi-carrier communication between a first user equipment and a second user equipment, and sidelink beam failure recovery of some carriers among the multiple carriers fails, the first user equipment sends information to the base station to indicate that sidelink beam failure recovery of some carriers fails.

[0076] For example, in the case where the communication between the first user equipment and the second user equipment is single-carrier, the first user equipment considers that the PC5 RRC connection is released, and indicates the PC5 RRC connection release to the upper layer; in the case where the communication between the first user equipment and the second user equipment is multi-carrier, and the sidelink beam recovery of all carriers (or frequencies) fails, the first user equipment considers that the PC5RRC connection is released, and indicates the PC5 RRC connection release to the upper layer; in the case where the communication between the first user equipment and the second user equipment is multi-carrier, and the sidelink beam recovery of some carriers (or frequencies) fails, the first user equipment sends an indication to the base station, indicating that the sidelink beam recovery of the carrier (or frequency) has failed.

[0077] By instructing the upper layer to release the PC5 RRC connection, the first user device can promptly release the software and hardware resources occupied by the communication with the second user device after the side link beam recovery fails, and try to communicate indirectly with the second user device by searching for other user devices as relays.

[0078] In the case where the side link beam failure recovery of some carriers among multiple carriers fails, the first user equipment sends information to the base station to indicate the side link beam failure recovery of some carriers. If the resource allocation mode between the first user equipment and the second user equipment is a base station scheduling mode, sending this information can enable the base station to subsequently not allocate resources for the communication between the first user equipment and the second user equipment on the carrier to avoid wasting resources.

[0079] In some embodiments, the sidelink beam failure recovery response is transmitted via at least one of: SCI, RRC message, MAC CE, and PSFCH.

[0080] The channel environment of the first user equipment and the second user equipment may be different. The suitable beam evaluated by the first user equipment may not be suitable as a sending / receiving beam at the second user equipment due to large interference. Therefore, the beam failure recovery negotiation may succeed or fail. By waiting for a response within a fixed time, it can avoid that the first user equipment waits too long and affects subsequent attempts to restore communication by other means, and it can also avoid that the first user equipment waits too short and misses the response.

[0081] In the above embodiment, the first user equipment detects a side link beam failure, and upon detecting the side link beam failure, sends a side link beam failure recovery request to the second user equipment, and carries side link beam failure indication information and indication information of candidate beams for side link beam failure recovery in the side link beam failure recovery request. The first user equipment receives a side link beam failure recovery response sent by the second user equipment to determine whether the side link beam failure recovery is successful. The above embodiment proposes a solution for the interaction of side link beam failure recovery signaling between a UE and a peer UE, which solves the problem of multi-carrier near-domain communication beam failure recovery between UEs. The UE with a side link beam failure can select and use other suitable beams with the peer UE to promptly restore near-domain communication, thereby improving the efficiency and accuracy of side link beam failure recovery.

[0082] Combine the following Figure 2 Other embodiments of the beam failure recovery method disclosed in the present invention are described.

[0083] Figure 2 Flowcharts of other embodiments of the beam failure recovery method disclosed in the present invention. Figure 2 As shown, the method of this embodiment includes: steps S202 to S210.

[0084] In step S202, the first user equipment receives configuration information.

[0085] In some embodiments, the first user equipment receives configuration information sent by the base station or the second user equipment.

[0086] The user equipment can autonomously control the sidelink beam failure recovery scheme. The user equipment can also take the lead and the base station assists in the sidelink beam failure recovery scheme.

[0087] In some embodiments, the configuration information is transmitted via at least one of the following: SCI, RRC message, MAC CE, PSFCH, system information.

[0088] For example, the base station may send the configuration information to the first user equipment via an RRC Reconfiguration Message; and the second user equipment may send the configuration information via an RRC Reconfiguration Sidelink Message.

[0089] In some embodiments, the configuration information includes: sidelink beam failure recovery configuration information and / or sidelink beam failure detection configuration information.

[0090] In some embodiments, the configuration information further includes at least one of the following: a destination identifier corresponding to the sidelink beam failure detection configuration information; a source layer 2 identifier corresponding to the sidelink beam failure detection configuration information; a destination identifier corresponding to the sidelink beam failure recovery configuration information; a source layer 2 identifier corresponding to the sidelink beam failure recovery configuration information; a sidelink carrier identifier corresponding to the sidelink beam failure detection configuration information; a sidelink frequency identifier corresponding to the sidelink beam failure detection configuration information; a sidelink carrier identifier corresponding to the sidelink beam failure recovery configuration information; and a sidelink frequency identifier corresponding to the sidelink beam failure recovery configuration information. These information may also be included in the corresponding sidelink beam failure detection configuration information and the sidelink beam failure recovery configuration information, respectively, and are not limited to specific locations.

[0091] The following first describes the sidelink beam failure recovery configuration (SL-BeamFailureRecoveryConfig) information.

[0092] In some embodiments, the sidelink beam failure recovery configuration information includes: indication information of candidate beams that can be used for sidelink beam failure recovery on one or more sidelink frequencies, and / or, indication information of candidate beams that can be used for sidelink beam failure recovery on one or more sidelink carriers.

[0093] In some embodiments, the indication information of candidate beams that can be used for sidelink beam failure recovery includes at least one of the following: a sidelink beam failure recovery RSRP threshold; one or more configured sidelink candidate beam reference signal lists.

[0094] One or more configured sidelink candidate beam reference signal lists may correspond to one or more sidelink frequencies or one or more sidelink carriers.

[0095] In some embodiments, the configured sidelink candidate beam reference signal list includes: a sidelink CSI-RS resource ID and / or a sidelink SSB index.

[0096] For example, the RRC Reconfiguration Message or the RRC Reconfiguration Sidelink Message may be configured in the following manner.

[0097] RRCReconfiguration::= SEQUENCE{

[0098] SL-BeamFailureRecoveryConfiglist SEQUENCE(SIZE(1..maxNrofFreqSL))OF SL-BeamFailureRecoveryConfig

[0099] sl-Frequency ARFCN-ValueNR

[0100] SL-DestinationIndex

[0101] The RRC reconfiguration field includes a sidelink beam failure recovery configuration list (SL-BeamFailureRecoveryConfiglist), including: a sidelink beam failure recovery configuration of one or more sidelink frequencies (or carriers), one or more sidelink frequencies (or carriers), and may also include: a sidelink destination identifier (SL-DestinationIndex), the destination identifier may be a destination identifier and / or a source Layer 2 identifier.

[0102] The sidelink beam failure recovery configuration (SL-BeamFailureRecoveryConfig) information element (information) is used to configure the user's resources and candidate beams for sidelink beam failure recovery when a sidelink beam failure is detected.

[0103] For example, the SL-BeamFailureRecoveryConfig IE may be configured in the following manner.

[0104]

[0105] SL-BeamFailureRecoveryConfig includes a sidelink beam failure recovery RSRP threshold (SL-rsrp-Threshold-BFR) and a SL-candidateBeamRSList (sidelink candidate beam reference signal list), and each SL-candidateBeamRSList may include a SL SSB index or a SL CSI-RS resource ID. SL-BeamFailureRecoveryConfig may also include indication information of sidelink beam failure recovery resources, which is used to indicate the type of resources in the configured sidelink candidate beam reference signal list corresponding to each sidelink frequency (or carrier). The sidelink beam failure recovery RSRP threshold may be a L1-RSRP threshold, which is used to determine whether a candidate beam can be used by the UE to attempt to recover from a sidelink beam failure, or whether a candidate beam can be included by the UE in a sidelink MAC CE for sidelink BFR.

[0106] In some embodiments, the sidelink beam failure recovery configuration information includes: a sidelink beam failure recovery response timer.

[0107] The following describes the Sidelink Beam Failure Detection configuration information.

[0108] In some embodiments, the sidelink beam failure detection configuration information includes: a maximum number of beam failure instances corresponding to one or more sidelink frequencies; and / or a maximum number of beam failure instances corresponding to one or more sidelink carriers. Each sidelink frequency (or carrier) may correspond to a maximum number of beam failure instances.

[0109] In some embodiments, the sidelink beam failure detection configuration information includes: indication information of a sidelink beam failure detection reference signal corresponding to one or more sidelink frequencies; and / or indication information of a sidelink beam failure detection reference signal corresponding to one or more sidelink carriers.

[0110] In some embodiments, the sidelink beam failure detection configuration information includes at least one of the following: an identifier of the sidelink frequency; an identifier of the sidelink carrier; an identifier of the sidelink beam failure detection reference signal corresponding to the sidelink frequency; an identifier of the sidelink beam failure detection reference signal corresponding to the sidelink carrier.

[0111] In some embodiments, the sidelink beam failure detection configuration information further includes: an identifier of a sidelink bandwidth part (SLBWP).

[0112] In some embodiments, the sidelink beam failure detection configuration information includes: a sidelink beam failure detection timer.

[0113] In some embodiments, the sidelink beam failure detection configuration information includes: corresponding indication information of a sidelink beam failure detection reference signal corresponding to each sidelink frequency and a reference signal in a list of configured sidelink candidate beam reference signals corresponding to each sidelink frequency; and / or corresponding indication information of a sidelink beam failure detection reference signal corresponding to each sidelink carrier and a reference signal in a list of configured sidelink candidate beam reference signals corresponding to each sidelink carrier.

[0114] For example, the RRC configures the following parameters for the beam failure detection and recovery procedure: beamFailureInstanceMaxCount for beam failure detection (maximum number of beam failure instances, per sidelink carrier / frequency). The following UE variables are used for the beam failure detection procedure: BFI_COUNTER (per sidelink carrier / frequency) - a counter of beam failure instance indications, initially set to 0. Sidelink beam failures may be detected by indicating a counter of sidelink beam failure instance indications from lower layers to the MAC entity.

[0115] For example, the sidelink beam failure detection configuration information may include a sidelink beam failure detection reference signal indication (Sidelink BFD-RS Indication) MAC CE, which may specifically include the following fields.

[0116] SL ID: This field indicates the identification of the sidelink frequency or sidelink carrier.

[0117] SL BWP ID: This field indicates the SL BWP.

[0118] S: This field indicates the presence of an octet containing the BFD-RS ID1 of the same BFD-RS List. The S field set to 1 indicates an octet containing the BFD-RS ID i The octet of the S field set to 0 indicates that the BFD-RS ID of the same BFD-RS set is not included. i octets.

[0119] SL BFD-RS ID i : This field indicates the SL BFD-RS resource.

[0120] In some embodiments, the configuration information received by the first user equipment from the second user equipment does not include a sidelink carrier index or a sidelink frequency index corresponding to the sidelink beam failure detection configuration information or the sidelink beam failure recovery configuration information.

[0121] By configuring the sidelink beam failure detection configuration information for the first user equipment through the second user equipment, the communicating parties can use a consistent criterion to determine whether a sidelink beam failure has occurred. Similarly, by configuring the sidelink beam failure recovery configuration information for the first user equipment through the second user equipment, the communicating parties can use a consistent criterion to determine whether the sidelink beam recovery is successful. The second user equipment configures the above information for the first user equipment, regardless of whether the first user equipment and the second user equipment are within the coverage of the base station.

[0122] At the same time, the destination identifier or source layer 2 identifier corresponding to the sidelink beam failure detection configuration information / sidelink beam failure recovery configuration information is configured, so that different logical connections can have different sidelink beam failure detection / recovery configurations, adapting to the service quality requirements of different services, and being more flexible. At the same time, the sidelink carrier index or sidelink frequency index corresponding to the sidelink beam failure detection configuration information / sidelink beam failure recovery configuration information is configured, so that different sidelink carriers can have different sidelink beam failure detection / recovery configurations, adapting to the propagation characteristics of different frequency bands, and being more flexible.

[0123] In step S204, the first user equipment performs sidelink beam failure detection according to the sidelink beam failure detection configuration information.

[0124] In some embodiments, when the beam failure instances for the sidelink frequency reach the corresponding maximum number of beam failure instances, beam failure on the sidelink frequency is determined; and / or when the beam failure instances for the sidelink carrier reach the corresponding maximum number of beam failure instances, beam failure on the sidelink carrier is determined.

[0125] For example, if for a specific destination, a specific carrier (or frequency), the number of beam failure instances reaches the maximum number of sidelink beam failure instances, and the sidelink beam failure detection timer has not timed out, the first user equipment considers that the sidelink beam has failed. For example, if an L1 (layer 1) metric, such as RSRP or BLER, reaches a corresponding threshold, it can be considered that a sidelink beam failure instance has occurred.

[0126] In step S206, the second user equipment determines indication information of a candidate beam for sidelink beam failure recovery according to the sidelink beam failure recovery configuration information.

[0127] The second user equipment may select a candidate beam according to the sidelink beam failure recovery configuration information.

[0128] In step S208, the first user equipment sends a sidelink beam failure recovery request to the second user equipment.

[0129] like Figure 3 As shown, there is multi-carrier communication between the transmitting terminal (second user equipment) and the receiving terminal (first user equipment). The receiving terminal detects that the beam of the sidelink carrier 1 fails, and the candidate beam 1 of the sidelink carrier 1 does not meet the sidelink beam failure recovery RSRP threshold. The candidate beams 2, 3, and 4 of the sidelink carrier 1 meet the sidelink beam failure recovery RSRP threshold. Then, a sidelink beam failure recovery request can be sent to the transmitting terminal.

[0130] In step S210, the first user equipment receives a sidelink beam failure recovery response sent by the second user equipment.

[0131] The various information disclosed herein can be used in any combination and is not limited to the examples given.

[0132] The disclosed solution proposes a multi-carrier sidelink beam failure recovery mechanism between UEs, including near-domain multi-carrier communication beam failure detection, configuration of recovery-related parameters, and sidelink beam failure recovery signaling interaction between UE and peer UE, solving the problem of multi-carrier near-domain communication beam failure recovery between UEs. Not only can the UE with a sidelink beam failure select and use other suitable beams with the peer UE to restore near-domain communication in a timely manner, but also avoids the additional communication interruption time and signaling interaction caused by the UE releasing the PC5 RRC connection or PC5 unicast link and trying to establish a connection again between the peer UE.

[0133] The present disclosure also provides a user equipment, Figure 4 Give a description.

[0134] Figure 4 FIG. 1 is a structural diagram of some embodiments of the user equipment disclosed in the present invention. Figure 4 As shown, the user equipment 40 of this embodiment, as a first user equipment, includes: a sending module 410 and a receiving module 420 .

[0135] The sending module 410 is used to send a side link beam failure recovery request to the second user equipment when a side link beam failure is detected, wherein the side link beam failure recovery request includes: side link beam failure indication information and indication information of candidate beams for side link beam failure recovery.

[0136] The receiving module 420 is used to receive a side link beam failure recovery response sent by the second user equipment to determine whether the side link beam failure recovery is successful.

[0137] In some embodiments, the sidelink beam failure indication information includes: one or more first fields, the first field is used to indicate whether a beam failure is detected on the corresponding sidelink frequency; and / or one or more second fields, the second field is used to indicate whether a beam failure is detected on the corresponding sidelink carrier.

[0138] In some embodiments, the indication information of the candidate beam for sidelink beam failure recovery includes at least one of the following: one or more first indications, the first indication is used to indicate whether the evaluation of the candidate beam on the corresponding sidelink frequency is completed; one or more first availability fields, the first availability field is used to indicate whether there is a candidate sidelink reference signal on the corresponding sidelink frequency whose reference signal received power RSRP exceeds the sidelink beam failure recovery RSRP threshold; one or more second indications, the second indication is used to indicate whether the evaluation of the candidate beam on the corresponding sidelink carrier is completed; one or more second availability fields, the second availability field is used to indicate whether there is a candidate sidelink reference signal on the corresponding sidelink carrier whose RSRP exceeds the sidelink beam failure recovery RSRP threshold.

[0139] In some embodiments, the sidelink beam failure indication information and the indication information of the candidate beam for sidelink beam failure recovery are jointly indicated using the same field.

[0140] In some embodiments, the indication information of the candidate beam for sidelink beam failure recovery also includes at least one of the following: an identification of a candidate sidelink reference signal whose RSRP on the corresponding sidelink frequency exceeds the sidelink beam failure recovery RSRP threshold; an identification of a candidate sidelink reference signal whose RSRP on the corresponding sidelink carrier exceeds the sidelink beam failure recovery RSRP threshold.

[0141] In some embodiments, the candidate sidelink reference signal comprises: a sidelink channel state information reference signal CSI-RS or a sidelink synchronization signal block SSB.

[0142] In some embodiments, the identification of the candidate sidelink reference signal includes: an index of a sidelink CSI-RS and / or an index of a sidelink SSB, wherein the index of the sidelink CSI-RS is an entry index corresponding to the sidelink CSI-RS in a configured sidelink candidate beam reference signal list, and the index of the sidelink SSB is an entry index corresponding to the sidelink SSB in a configured sidelink candidate beam reference signal list.

[0143] In some embodiments, the sidelink beam failure recovery request is transmitted via at least one of: sidelink control information SCI, radio resource control RRC message, medium access control MAC control element CE and physical sidelink feedback channel PSFCH.

[0144] In some embodiments, the receiving module 420 is used to determine that the side link beam failure recovery is successful when a side link beam failure recovery response is received before the side link beam failure recovery response timer times out.

[0145] In some embodiments, the sending module 410 is also used to send information indicating the failure of side link beam failure recovery of some carriers to the base station when there is multi-carrier communication between the first user equipment and the second user equipment and the side link beam failure recovery of some carriers in the multiple carriers fails.

[0146] In some embodiments, the receiving module 420 is used to determine that the side link beam failure recovery has failed if no side link beam failure recovery response is received before the side link beam failure recovery response timer expires; the sending module 410 is also used to indicate to the upper layer that the PC5 interface radio resource control RRC connection is released.

[0147] In some embodiments, the receiving module 420 is used to receive configuration information, wherein the configuration information includes: sidelink beam failure detection configuration information and / or sidelink beam failure recovery configuration information.

[0148] In some embodiments, the sidelink beam failure recovery configuration information includes: indication information of candidate beams that can be used for sidelink beam failure recovery on one or more sidelink frequencies, and / or, indication information of candidate beams that can be used for sidelink beam failure recovery on one or more sidelink carriers.

[0149] In some embodiments, the indication information of candidate beams that can be used for sidelink beam failure recovery includes at least one of the following: a sidelink beam failure recovery reference signal received power RSRP threshold; one or more configured sidelink candidate beam reference signal lists.

[0150] In some embodiments, the configured sidelink candidate beam reference signal list includes: a sidelink CSI-RS resource ID and / or a sidelink SSB index.

[0151] In some embodiments, the sidelink beam failure recovery configuration information includes: a sidelink beam failure recovery response timer.

[0152] In some embodiments, the sidelink beam failure detection configuration information includes: a maximum number of beam failure instances corresponding to one or more sidelink frequencies; and / or a maximum number of beam failure instances corresponding to one or more sidelink carriers.

[0153] In some embodiments, the sidelink beam failure detection configuration information includes: indication information of a sidelink beam failure detection reference signal corresponding to one or more sidelink frequencies; and / or indication information of a sidelink beam failure detection reference signal corresponding to one or more sidelink carriers.

[0154] In some embodiments, the sidelink beam failure detection configuration information includes at least one of the following: an identifier of the sidelink frequency; an identifier of the sidelink carrier; an identifier of the sidelink beam failure detection reference signal corresponding to the sidelink frequency; an identifier of the sidelink beam failure detection reference signal corresponding to the sidelink carrier.

[0155] In some embodiments, the sidelink beam failure detection configuration information further includes: an identifier of the sidelink bandwidth portion.

[0156] In some embodiments, the sidelink beam failure detection configuration information includes: a sidelink beam failure detection timer.

[0157] In some embodiments, the configuration information also includes at least one of the following: a destination identifier corresponding to the sidelink beam failure detection configuration information; a source layer two identifier corresponding to the sidelink beam failure detection configuration information; a destination identifier corresponding to the sidelink beam failure recovery configuration information; a source layer two identifier corresponding to the sidelink beam failure recovery configuration information; a sidelink carrier identifier corresponding to the sidelink beam failure detection configuration information; a sidelink frequency identifier corresponding to the sidelink beam failure detection configuration information; a sidelink carrier identifier corresponding to the sidelink beam failure recovery configuration information; and a sidelink frequency identifier corresponding to the sidelink beam failure recovery configuration information.

[0158] In some embodiments, the user equipment 40 also includes a detection module 430 and a selection module 440, the detection module 430 is used to perform side link beam failure detection according to the side link beam failure detection configuration information; the selection module 440 is used to determine the indication information of the candidate beam for side link beam failure recovery according to the side link beam failure recovery configuration information.

[0159] In some embodiments, the selection module 440 is used to determine a beam failure on a sidelink frequency when the beam failure instance reaches the corresponding maximum number of beam failure instances for the sidelink frequency; and / or determine a beam failure on a sidelink carrier when the beam failure instance reaches the corresponding maximum number of beam failure instances for the sidelink carrier.

[0160] In some embodiments, the receiving module 420 is used to receive configuration information sent by the base station or the second user equipment, wherein the configuration information is transmitted through at least one of the following: sidelink control information SCI, radio resource control RRC message, media access control MAC control element CE and physical sidelink feedback channel PSFCH.

[0161] The user devices in the embodiments of the present disclosure may be implemented by various computing devices or computer systems. Figure 5 as well as Figure 6 Give a description.

[0162] Figure 5 FIG. 1 is a structural diagram of some embodiments of the user equipment disclosed in the present invention. Figure 5 As shown, the user equipment 50 of this embodiment includes: a memory 510 and a processor 520 coupled to the memory 510, and the processor 520 is configured to execute the beam failure recovery method in any some embodiments of the present disclosure based on the instructions stored in the memory 510.

[0163] The memory 510 may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application program, a boot loader, a database, and other programs.

[0164] Figure 6 FIG. 1 is a structural diagram of some other embodiments of the user equipment disclosed in the present invention. Figure 6 As shown, the device 60 of this embodiment includes: a memory 610 and a processor 620, which are similar to the memory 510 and the processor 520 respectively. It can also include an input and output interface 630, a network interface 640, a storage interface 650, etc. These interfaces 630, 640, 650 and the memory 610 and the processor 620 can be connected, for example, through a bus 660. Among them, the input and output interface 630 provides a connection interface for input and output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 640 provides a connection interface for various networked devices, for example, it can be connected to a database server or a cloud storage server. The storage interface 650 provides a connection interface for external storage devices such as SD cards and USB flash drives.

[0165] The present disclosure also provides a beam failure recovery system. Figure 7 Give a description.

[0166] Figure 7 FIG. 1 is a structural diagram of some embodiments of the beam failure recovery system disclosed in the present invention. Figure 7As shown, the beam failure recovery system 7 of this embodiment includes: the user equipment 40 / 50 / 60 of any of the aforementioned embodiments, as a first user equipment, and a second user equipment 72.

[0167] The second user equipment 72 is used to receive a side link beam failure recovery request sent by the first user equipment 40 / 50 / 60, and send a side link beam failure recovery response to the first user equipment 40 / 50 / 60, wherein the side link beam failure recovery request includes: side link beam failure indication information and indication information of candidate beams for side link beam failure recovery.

[0168] In some embodiments, the second user equipment 72 is further used to send configuration information to the first user equipment 40 / 50 / 60, wherein the configuration information includes: sidelink beam failure detection configuration information and / or sidelink beam failure recovery configuration information.

[0169] In some embodiments, the beam failure recovery system 70 also includes: a base station 74, used to send configuration information to the first user equipment 40 / 50 / 60, wherein the configuration information includes: sidelink beam failure detection configuration information and / or sidelink beam failure recovery configuration information.

[0170] In some embodiments, the base station 74 is also used to receive information sent by the first user equipment 40 / 50 / 60 to indicate the failure of side link beam failure recovery of some carriers when there is multi-carrier communication between the first user equipment 40 / 50 / 60 and the second user equipment 72 and the side link beam failure recovery of some carriers in the multiple carriers fails.

[0171] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure may take the form of a computer program product implemented on one or more computer-usable non-transient storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0172] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0173] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0174] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0175] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A beam failure recovery method, performed by a first user equipment, comprising: In the case of detecting a side link beam failure, sending a side link beam failure recovery request to the second user equipment, wherein the side link beam failure recovery request includes: side link beam failure indication information and indication information of a candidate beam for side link beam failure recovery; Receive a sidelink beam failure recovery response sent by the second user equipment to determine whether the sidelink beam failure recovery is successful.

2. The beam failure recovery method according to claim 1, wherein: The sidelink beam failure indication information includes: one or more first fields, the first field being used to indicate whether a beam failure is detected on the corresponding sidelink frequency; and / or One or more second fields, wherein the second field is used to indicate whether a beam failure is detected on the corresponding sidelink carrier.

3. The beam failure recovery method according to claim 1, wherein: The indication information of the candidate beam for sidelink beam failure recovery includes at least one of the following: one or more first indications, the first indication being used to indicate whether the evaluation of the candidate beam on the corresponding sidelink frequency is completed; One or more first availability fields, where the first availability fields are used to indicate whether there is a candidate sidelink reference signal whose reference signal received power RSRP exceeds the sidelink beam failure recovery RSRP threshold on the corresponding sidelink frequency; one or more second indications, the second indication being used to indicate whether the evaluation of the candidate beam on the corresponding sidelink carrier is completed; One or more second availability fields, wherein the second availability field is used to indicate whether there is a candidate sidelink reference signal on the corresponding sidelink carrier whose RSRP exceeds the sidelink beam failure recovery RSRP threshold.

4. The beam failure recovery method according to claim 1, wherein: The sidelink beam failure indication information and the indication information of the candidate beam for sidelink beam failure recovery are jointly indicated using the same field.

5. The beam failure recovery method according to claim 3, wherein: The indication information of the candidate beam for sidelink beam failure recovery also includes at least one of the following: an identification of a candidate sidelink reference signal having an RSRP exceeding a sidelink beam failure recovery RSRP threshold on the corresponding sidelink frequency; An identifier of a candidate sidelink reference signal whose RSRP on the corresponding sidelink carrier exceeds a sidelink beam failure recovery RSRP threshold.

6. The beam failure recovery method according to claim 3 or 5, wherein: The candidate sidelink reference signal includes: a sidelink channel state information reference signal CSI-RS or a sidelink synchronization signal block SSB.

7. The beam failure recovery method according to claim 6, wherein: The identifier of the candidate sidelink reference signal includes: an index of a sidelink CSI-RS and / or an index of a sidelink SSB, wherein the index of the sidelink CSI-RS is an entry index corresponding to the sidelink CSI-RS in a configured sidelink candidate beam reference signal list, and the index of the sidelink SSB is an entry index corresponding to the sidelink SSB in a configured sidelink candidate beam reference signal list.

8. The beam failure recovery method according to claim 1, wherein: The sidelink beam failure recovery request is transmitted via at least one of the following: sidelink control information SCI, radio resource control RRC message, media access control MAC control element CE and physical sidelink feedback channel PSFCH.

9. The beam failure recovery method according to claim 1, wherein: In case the side link beam failure recovery response is received before the side link beam failure recovery response timer times out, it is determined that the side link beam failure recovery is successful.

10. The beam failure recovery method according to claim 1 or 9, further comprising: In the case where there is multi-carrier communication between the first user equipment and the second user equipment, and side link beam failure recovery of some carriers among the multiple carriers fails, information indicating that side link beam failure recovery of the some carriers fails is sent to the base station.

11. The beam failure recovery method according to claim 1, wherein: When the side link beam failure recovery response is not received before the side link beam failure recovery response timer times out, it is determined that the side link beam failure recovery has failed; and the PC5 interface radio resource control RRC connection release is indicated to the upper layer.

12. The beam failure recovery method according to claim 1, further comprising: Receive configuration information, wherein the configuration information includes: sidelink beam failure detection configuration information and / or sidelink beam failure recovery configuration information.

13. The beam failure recovery method according to claim 12, wherein: The sidelink beam failure recovery configuration information includes: indication information of candidate beams that can be used for sidelink beam failure recovery on one or more sidelink frequencies, and / or indication information of candidate beams that can be used for sidelink beam failure recovery on one or more sidelink carriers.

14. The beam failure recovery method according to claim 13, wherein: The indication information of the candidate beam that can be used for sidelink beam failure recovery includes at least one of the following: Sidelink beam failure recovery reference signal received power RSRP threshold; A list of one or more configured sidelink candidate beam reference signals.

15. The beam failure recovery method according to claim 14, wherein: The configured sidelink candidate beam reference signal list includes: sidelink CSI-RS resource ID and / or sidelink SSB index.

16. The beam failure recovery method according to claim 12, wherein: The side link beam failure recovery configuration information includes: a side link beam failure recovery response timer.

17. The beam failure recovery method according to claim 12, wherein: The sidelink beam failure detection configuration information includes: The maximum number of beam failure instances for one or more sidelink frequencies; and / or Maximum number of beam failure instances corresponding to one or more sidelink carriers.

18. The beam failure recovery method according to claim 12, wherein: The sidelink beam failure detection configuration information includes: An indication of a sidelink beam failure detection reference signal corresponding to one or more sidelink frequencies; and / or Indication information of a sidelink beam failure detection reference signal corresponding to one or more sidelink carriers.

19. The beam failure recovery method according to claim 13, 17 or 18, wherein: The sidelink beam failure detection configuration information includes at least one of the following: an identification of the sidelink frequency; an identifier of the sidelink carrier; an identifier of a sidelink beam failure detection reference signal corresponding to the sidelink frequency; An identifier of a sidelink beam failure detection reference signal corresponding to the sidelink carrier.

20. The beam failure recovery method according to claim 19, wherein the sidelink beam failure detection configuration information further comprises: Identifier of the sidelink bandwidth portion.

21. The beam failure recovery method according to claim 12, wherein: The sidelink beam failure detection configuration information includes: a sidelink beam failure detection timer.

22. The beam failure recovery method according to claim 12, wherein: The configuration information also includes at least one of the following: The destination identifier corresponding to the sidelink beam failure detection configuration information; The source layer 2 identifier corresponding to the sidelink beam failure detection configuration information; Destination identifier corresponding to the sidelink beam failure recovery configuration information; The source layer 2 identifier corresponding to the sidelink beam failure recovery configuration information; A sidelink carrier identifier corresponding to the sidelink beam failure detection configuration information; The sidelink frequency identifier corresponding to the sidelink beam failure detection configuration information; The sidelink carrier identifier corresponding to the sidelink beam failure recovery configuration information; Sidelink frequency identifier corresponding to the sidelink beam failure recovery configuration information.

23. The beam failure recovery method according to claim 12, further comprising: Performing side link beam failure detection according to side link beam failure detection configuration information; Determine the indication information of the candidate beam for sidelink beam failure recovery according to the sidelink beam failure recovery configuration information.

24. The beam failure recovery method according to claim 23, wherein: The performing side link beam failure detection according to the side link beam failure detection configuration information includes: determining a beam failure on the side link frequency when the beam failure instance reaches a corresponding maximum number of beam failure instances for the side link frequency; and / or When the number of beam failure instances for the sidelink carrier reaches a corresponding maximum number of beam failure instances, beam failure on the sidelink carrier is determined.

25. The beam failure recovery method according to claim 12, wherein: The receiving configuration information includes: Receive configuration information sent by the base station or the second user equipment, wherein the configuration information is transmitted through at least one of the following: sidelink control information SCI, radio resource control RRC message, media access control MAC control element CE and physical sidelink feedback channel PSFCH.

26. A user equipment, as a first user equipment, comprising: A sending module, configured to send a side link beam failure recovery request to a second user equipment when a side link beam failure is detected, wherein the side link beam failure recovery request includes: side link beam failure indication information and indication information of a candidate beam for side link beam failure recovery; A receiving module is used to receive a side link beam failure recovery response sent by the second user equipment to determine whether the side link beam failure recovery is successful.

27. A user equipment, comprising: processor; as well as A memory coupled to the processor, for storing instructions, wherein when the instructions are executed by the processor, the processor executes the beam failure recovery method as described in any one of claims 1-25.

28. A computer-readable storage medium having a computer program stored thereon, wherein: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 25 are implemented.

29. A beam failure recovery system, comprising: The user equipment according to claim 26 or 27, as a first user equipment; as well as The second user equipment is used to receive the side link beam failure recovery request sent by the first user equipment, and send a side link beam failure recovery response to the first user equipment, wherein the side link beam failure recovery request includes: side link beam failure indication information and indication information of candidate beams for side link beam failure recovery.

30. The beam failure recovery system according to claim 29, wherein: The second user equipment is further used to send configuration information to the first user equipment, wherein the configuration information includes: sidelink beam failure detection configuration information and / or sidelink beam failure recovery configuration information.

31. The beam failure recovery system according to claim 29, further comprising: A base station is used to send configuration information to the first user equipment, wherein the configuration information includes: sidelink beam failure detection configuration information and / or sidelink beam failure recovery configuration information.

32. The beam failure recovery system according to claim 31, wherein: The base station is also used to receive information sent by the first user equipment to indicate the failure of side link beam failure recovery of some carriers when there is multi-carrier communication between the first user equipment and the second user equipment and the side link beam failure recovery of some carriers among the multiple carriers fails.

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