Beam failure recovery information transmission method and apparatus

Abstract

In an embodiment of the present invention, a beam failure recovery information transmitting method, a beam failure recovery information receiving method and an apparatus are provided, which is applied to a terminal device side, and includes a detection unit and a first transmission unit, the detection unit detects beam failures in all two transmission / reception points (TRPs) of a special cell, the first transmission unit transmits a first message in a random access procedure to a network device, the first message includes a first beam failure recovery medium access control (MAC) control unit (CE) with a fixed size, or the first message includes a second beam failure recovery MAC CE, the first beam failure recovery MAC CE includes beam failure recovery information of the two TRPs, and the second beam failure recovery MAC CE includes beam failure recovery information of the first TRP of the two TRPs.

Description

[Technical Field]

[0001] The present invention relates to the field of communications. [Background technology]

[0002] The New Radio (NR) system supports beam transmission and reception and the management of multiple beams. Terminal devices can perform beam failure detection (BFD) and beam failure recovery (BFR) procedures.

[0003] In the beam failure recovery procedure, the MAC entity can perform the following operations: If the beam failure recovery procedure determines that at least one BFR has already been triggered and that BFR has not yet been canceled, then evaluation of that candidate beam has already been completed according to needs: If the uplink resource (UL-SCH resource) is available for one new transmission and the result of the Logical Channel Prioritization procedure (LCP) is that the uplink resource can accommodate the BFR MAC CE plus its subheader, the multiplexing and assembly procedure instructs the BFR MAC CE to be generated; and If the uplink resource can be used for one new transmission and the result of the LCP is “the uplink resource can accommodate the truncated BFR MAC CE plus its subheader”, instruct a multiplexing and assembly procedure to generate a truncated BFR MAC CE; Otherwise, trigger a Scheduling Request (SR) for each secondary cell for which BFR has been triggered, BFR has not yet been cancelled, and whose candidate beams have already been evaluated according to needs.

[0004] Therefore, the beam failure recovery information can be carried by the BFR MAC CE or the truncated BFR MAC CE (hereinafter, may be abbreviated as (Truncated) BFR MAC CE) and transmitted to the network device by the terminal device.

[0005] When a Media Access Control (MAC) Protocol Data Unit (PDU) is sent by a terminal device to a network device, and this MAC PDU contains a BFR MAC Control Element (CE) or a Truncated BFR MAC CE carrying beam failure recovery information, the terminal device should cancel all BFRs of the secondary cell that were triggered for beam failure recovery before the MAC PDU was assembled.

[0006] It should be noted that the introduction of the above background art is intended to clearly and completely explain the technical solutions of the present invention and to facilitate understanding by those skilled in the art, and these technical solutions described in the background art of the present invention should not be construed as being known to those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0007] However, the inventors have discovered that under multi-transmit / receive point (TRP) operation, when beam failures are detected in two TRPs, the terminal device needs to transmit beam failure recovery information for the two TRPs that need recovery in the random access procedure, and according to the conventional mechanism, when the resource of the Msg3 / MSGA payload in the random access procedure is not large enough, the Msg3 / MSGA payload cannot carry the BFR MAC CE containing the beam failure recovery information for the two TRPs that need recovery.

[0008] In view of at least one of the above problems, embodiments of the present invention provide a beam failure recovery information transmitting method, a beam failure recovery information receiving method and apparatus. [Means for solving the problem]

[0009] According to one aspect of an embodiment of the present invention, a beam failure recovery information transmitting device is provided, which is applied to a terminal device side, and the device includes: A detection unit detecting all beam failures at the two transmit / receive points (TRPs) of the special cell; and a first sending unit for sending a first message in a random access procedure to a network device; The first message includes a first beam failure recovery medium access control (MAC) control unit (CE) of fixed size, or the first message includes a second beam failure recovery MAC CE, the first beam failure recovery MAC CE including beam failure recovery information of the two TRPs, and the second beam failure recovery MAC CE including beam failure recovery information of the first TRP of the two TRPs.

[0010] According to another aspect of the embodiment of the present invention, there is provided a beam failure recovery information receiving device, which is applied to a network device side, and the device includes: A second transmitting unit for transmitting candidate beam setting information to the terminal device; and a fourth receiving unit for receiving a first message in the random access procedure transmitted by the terminal device; The first message includes a first beam failure recovery MAC CE of fixed size, or the first message includes a second beam failure recovery MAC CE, the first beam failure recovery MAC CE including beam failure recovery information of two TRPs, and the second beam failure recovery MAC CE including beam failure recovery information of the first TRP of the two TRPs.

[0011] According to another aspect of an embodiment of the present invention, there is provided a communication system, which includes the terminal device according to the one aspect above and / or the network device according to the other aspect above. [Effects of the Invention]

[0012] The advantageous effects of the embodiment of the present invention are at least as follows: when beam failures are detected in both TRPs, a BFR MAC CE of fixed size including beam failure recovery information for two TRPs that require recovery is transmitted in the random access procedure, or a BFR MAC CE including beam failure recovery information for one TRP that requires recovery is transmitted. This allows Msg3 / MSGA in the random access procedure to transmit beam failure recovery information for one or two TRPs with sufficiently small overhead, so that the network device can know the beam failure recovery information for two TRPs and perform beam recovery.

[0013] The following description and reference to the drawings disclose in detail particular embodiments of the present invention, illustrating ways in which the principles of the present invention may be employed, but the scope of the present invention is not limited thereto, and various changes, modifications, and alternatives may be included within the scope of the appended claims.

[0014] Additionally, features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, may be combined with features in the other embodiments, or may be substituted for features in the other embodiments.

[0015] It should be noted that when used in this specification, terms such as "comprise / have" refer to the presence of a feature, element, step, or assembly, but do not exclude the presence or addition of one or more other features, elements, steps, or assemblies. [Brief explanation of the drawings]

[0016] Elements and features described in one drawing or one embodiment of the invention may be combined with elements and features shown in one or more other drawings or embodiments, and in the drawings, like reference numerals are used to indicate corresponding parts in several drawings and to indicate corresponding parts used in several embodiments. [Figure 1] 1 is a diagram illustrating a communication system according to an embodiment of the present invention. [Figure 2] FIG. 10 is a diagram illustrating the format of a MAC CE. [Figure 3] FIG. 10 is a diagram illustrating the format of a MAC CE. [Figure 4] FIG. 1 is a diagram illustrating a multi-TRP scenario according to an embodiment of the present invention. [Figure 5] A diagram showing a beam failure recovery information transmission method in an embodiment of the present invention. [Figure 6] FIG. 10 is a diagram illustrating an example of a first MAC subheader in an embodiment of the present invention. [Figure 7] FIG. 10 is a diagram illustrating an example of a first MAC subheader in an embodiment of the present invention. [Figure 8] A diagram showing an example of a first beam failure recovery MAC CE in an embodiment of the present invention. [Figure 9] A diagram showing an example of a first beam failure recovery MAC CE in an embodiment of the present invention. [Figure 10] A diagram showing an example of a first beam failure recovery MAC CE in an embodiment of the present invention. [Figure 11] A diagram showing an example of a first beam failure recovery MAC CE in an embodiment of the present invention. [Figure 12]A diagram showing an example of a first beam failure recovery MAC CE in an embodiment of the present invention. [Figure 13] A diagram showing an example of a first beam failure recovery MAC CE in an embodiment of the present invention. [Figure 14] A diagram showing a beam failure recovery information transmission method in an embodiment of the present invention. [Figure 15] FIG. 10 is a diagram illustrating an example of a second MAC subheader in an embodiment of the present invention. [Figure 16] FIG. 10 is a diagram illustrating an example of a second MAC subheader in an embodiment of the present invention. [Figure 17A] A diagram showing an example of a second beam failure recovery MAC CE in an embodiment of the present invention. [Figure 17B] A diagram showing an example of a second beam failure recovery MAC CE in an embodiment of the present invention. [Figure 18A] A diagram showing an example of a second beam failure recovery MAC CE in an embodiment of the present invention. [Figure 18B] A diagram showing an example of a second beam failure recovery MAC CE in an embodiment of the present invention. [Figure 19] A diagram showing a method for receiving beam failure recovery information in an embodiment of the present invention. [Figure 20] FIG. 1 illustrates a beam failure recovery method in an embodiment of the present invention. [Figure 21] FIG. 1 is a diagram illustrating a beam failure recovery information transmission device in an embodiment of the present invention. [Figure 22] FIG. 1 illustrates a beam failure recovery device in accordance with an embodiment of the present invention. [Figure 23] FIG. 1 is a diagram showing a beam failure recovery information receiving device in an embodiment of the present invention. [Figure 24] FIG. 1 illustrates a network device according to an embodiment of the present invention. [Figure 25] FIG. 1 is a diagram illustrating a terminal device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The foregoing and other features of the present invention will become more apparent from a consideration of the accompanying drawings and the following description. While the specification and drawings disclose particular embodiments of the present invention, they illustrate only some of the embodiments which may employ the principles of the present invention, and it is to be understood that the present invention is not limited to the described embodiments, but rather includes all modifications, variations, and alternatives which fall within the scope of the appended claims.

[0018] In embodiments of the present invention, the term "communication network" or "wireless communication network" may refer to a network conforming to any communication standard, such as LTE (Long Term Evolution), LTE-A (LTE-Advanced), WCDMA (Wideband Code Division Multiple Access), HSPA (High-Speed ​​Packet Access), etc.

[0019] Additionally, communications between devices in a communications system may be performed according to any level of communications protocol, including, but not limited to, 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, 5G, New Radio (NR), and / or other conventional or future-developed communications protocols.

[0020] In the embodiments of the present invention, the term "network device" refers to a device that connects a terminal device to a communication network and provides services to the terminal device in a communication system, for example, a network device may include, but is not limited to, a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobile management entity (MME), a network gateway, a server, a radio network controller (RNC), a base station controller (BSC), etc.

[0021] The base station may include, but is not limited to, a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), a 5G base station (gNB), etc., and may further include a Remote Radio Head (RRH), a Remote Radio Unit (RRU), a relay, or a low-power node (e.g., femto, pico, etc.). The term "base station" may include some or all of the functions thereof, and each base station can provide communication coverage for a specific geographic area. The term "cell" may refer to a base station and / or the area it covers, depending on the context in which the term is used. Unless confusion arises, the terms "cell" and "base station" are interchangeable.

[0022] In embodiments of the present invention, the term "user equipment" (UE) or "terminal equipment" (TE) refers to a device that accesses a communication network through a network device and receives services from the network. A user equipment may be fixed or mobile, and may also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, etc. For example, a terminal device served by an IAB node or an IAB donor under the IAB architecture.

[0023] Among these, user devices may include, but are not limited to, cellular phones, personal digital assistants (PDAs), wireless modems, wireless communication devices, mobile devices, machine-type communication devices, laptop computers, cordless phones, smartphones, smart watches, digital cameras, etc.

[0024] Furthermore, for example, in a scenario such as the Internet of Things (IoT), the user equipment may also be a monitoring or measuring device or apparatus, including, but not limited to, a Machine Type Communication (MTC) terminal, an in-vehicle communication terminal, a Device to Device (D2D) terminal, a Machine to Machine (M2M) terminal, etc.

[0025] Furthermore, the term "network side" or "network device side" refers to the network side, which may be a base station or may include one or more network devices as described above. The term "user side" or "terminal side" or "terminal device side" refers to the user or terminal side, which may be a UE or may include one or more terminal devices as described above. Here, unless otherwise specified, "device" may refer to a network device or may refer to a terminal device.

[0026] In embodiments of the present invention, cell-specific may be understood as cell level or all beams, with cell being the granularity. TRP-specific may be understood as TRP level or some beams, with TRP being the granularity. The term "detecting beam failure" is interchangeable with "triggering beam failure recovery" or "triggering beam failure indication", the term "beam" is interchangeable with "reference signal", the term "recovery required" is interchangeable with "failed", the term "TRP" is interchangeable with "some or one BFD-RS set", the term "beam failure of TRP" is interchangeable with "some beam failure or beam failure of one BFD-RS set", and the term "beam failure recovery of TRP" is interchangeable with "some beam failure recovery or beam failure recovery of one BFD-RS set".

[0027] The following describes an example scenario of the present invention, but the present invention is not limited thereto.

[0028] 1 is a diagram showing a communication system in an embodiment of the present invention, taking a terminal device and a network device as an example. As shown in FIG. 1, a communication system 100 may include a network device 101 and a terminal device 102. For convenience, FIG. 1 illustrates an example in which only one terminal device and only one network device are included, but the embodiment of the present invention is not limited to this, and for example, multiple terminal devices may be included.

[0029] In an embodiment of the present invention, legacy or future traffic may be transmitted between the network device 101 and the terminal device 102. For example, this traffic may be, but is not limited to, enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), Ultra-Reliable and Low-Latency Communication (URLLC), etc.

[0030] In the beam failure detection (BFD) procedure, the MAC entity of the Media Access Control (MAC) layer of the terminal device detects a cell-specific beam failure by calculating the number of beam failure instance indications provided to the MAC entity by a lower layer (e.g., the physical layer).

[0031] For example, the beam failure detection procedure uses a UE variable BFI_COUNTER, which is a counter of beam failure instance indications, and its initial setting is 0, and each serving cell has one BFI_COUNTER. For each serving cell configured for beam failure detection, the MAC entity can perform the following operation (cell-level / cell-specific beam failure recovery trigger): When a beam failure instance indication is received from a lower layer, the beam failure detection timer (beamFailureDetectionTimer) is started or restarted, and the terminal device variable (BFI_COUNTER) is incremented by 1. If BFI_COUNTER is greater than or equal to the beam failure instance maximum count (beamFailureInstanceMaxCount), the terminal device triggers a beam failure recovery (BFR) for one of the serving cells if the serving cell is a secondary cell (SCell); otherwise, it initiates a random access procedure in a special cell (SpCell). If the beamFailureDetectionTimer has expired, or if a higher layer has reconfigured the beamFailureDetectionTimer, beamFailureInstanceMaxCount, or any reference signal for beam failure detection for this serving cell, the terminal device sets BFI_COUNTER to 0.

[0032] As mentioned above, in the beam failure recovery procedure, the beam failure recovery information can be carried by the BFR MAC CE or the Truncated BFR MAC CE and transmitted by the terminal device to the network device.

[0033] A MAC PDU is a byte-aligned (i.e., multiple of 8-bit) bit string. Typically, the bit string is represented as a table, with the most significant digit being the leftmost bit in the first row of the table, the least significant digit being the rightmost bit in the last row of the table, and the bit string being read row by row from left to right. A MAC PDU contains one or more MAC sub-PDUs. Each MAC sub-PDU contains one MAC subheader, or one MAC subheader and one MAC service data unit (SDU), or one MAC subheader and one MAC CE, or one MAC subheader and padding.

[0034] A MAC subheader is a byte-aligned (i.e., multiple of 8-bit) bit string. Each subheader corresponds to one MAC SDU, or one MAC CE, or padding, and each subheader immediately precedes its corresponding MAC SDU, MAC CE, or padding.

[0035] A MAC SDU is a byte-aligned (i.e., multiple of 8 bits) bit string of variable size. A MAC SDU is included in a MAC PDU starting from the first bit.

[0036] A MAC CE is a byte-aligned (ie, multiple of 8 bits) bit string.

[0037] The BFR MAC CE and the Truncated BFR MAC CE are identified by a MAC header that carries a logical channel indicator / extended logical channel indicator LCID / eLCID, for example, the logical channel indicator carried by the BFR MAC CE is 50 and the logical channel indicator carried by the Truncated BFR MAC CE is 51, or the logical channel indicator carried by the BFR MAC CE is 33 or 34 and the extended logical channel indicator is 250, or the logical channel indicator carried by the Truncated BFR MAC CE is 33 or 34 and the extended logical channel indicator is 251.

[0038] The size of the BFR MAC CE and the Truncated BFR MAC CE is variable. They contain one bitmap and beam failure recovery information arranged in ascending order according to ServCellIndex, i.e., the candidate beam availability indication (AC) bytes of the secondary cell indicated by the bitmap.

[0039] Fig. 2 is a diagram showing a BFR MAC CE or a truncated BFR MAC CE in a first format (referred to as format 1), and Fig. 3 is a diagram showing a BFR MAC CE or a truncated BFR MAC CE in a second format (referred to as format 2).

[0040] Specifically, for example, for a BFR MAC CE, if the MAC entity has detected a beam failure and the highest serving cell index ServCellIndex of the secondary cell for which evaluation of candidate beams has already been completed according to needs is less than 8, then format 1 (1-byte bitmap) of Figure 2 is used; otherwise, format 2 (4-byte bitmap) of Figure 3 is used.

[0041] For a Truncated BFR MAC CE, if the MAC entity detects a beam failure and the highest serving cell index ServCellIndex of a secondary cell for which candidate beam evaluation has already been completed according to needs is smaller than 8, or if a special cell detects a beam failure and this special cell is included in one Truncated BFR MAC CE and the LCP result is "the UL-SCH resources cannot accommodate the Truncated BFR MAC CE in Format 2 of Figure 3 plus its subheader", then Format 1 of Figure 2 shall be used, otherwise Format 2 of Figure 3 shall be used.

[0042] For example, the definitions of the fields in Format 1 and Format 2 are as follows:

[0043] The AC field indicates whether the Candidate RS ID field is present in this byte. If this AC field is set to 1, the Candidate RS ID field is present. If this AC field is set to 0, the R bits are present and the Candidate RS ID field is set to the index of the SSB or CSI-RS. This field is 6 bits long, the R field indicates a reserved bit and is set to 0, and the SP field indicates beaming failure detection of a special cell for this MAC entity. The SP field is set to 1 to indicate beaming failure of a special cell only if a BFR MAC CE or a Truncated BFR MAC CE is included in one MAC PDU and is part of the random access procedure; otherwise, it is set to 0.

[0044] For BFR MAC CE, the Ci field indicates whether beam failure detection for the secondary cell of ServCellIndex i, evaluation of candidate beams according to needs has been completed, and there may be one byte consisting of an AC field, which indicates whether a Candidate RS ID field is present in this byte, and the Candidate RS ID field is set to the index of an SSB or CSI-RS.

[0045] When the Ci field is set to 1, it indicates that a beam failure has been detected in the secondary cell of ServCellIndex i, the evaluation of candidate beams has already been completed according to the needs, and a byte containing the AC field exists. When the Ci field is set to 0, it indicates that a beam failure has not been detected in the secondary cell of ServCellIndex i, or a beam failure has been detected but the evaluation of candidate beams has not yet been completed according to the needs, and a byte containing the AC field does not exist. If present, the bytes containing the AC field exist (appear) in ascending order of ServCellIndex.

[0046] For Truncated BFR MAC CE, the Ci field indicates whether beam failure detection for the secondary cell of ServCellIndex i, evaluation of candidate beams according to needs has been completed, and there may be one byte consisting of an AC field, which indicates whether a Candidate RS ID field is present in this byte, and the Candidate RS ID field is set to the index of an SSB or CSI-RS.

[0047] A Ci field set to 1 indicates that the secondary cell with ServCellIndex i has detected a beam failure, has already completed candidate beam evaluation according to its needs, and may have bytes containing the AC field. A Ci field set to 0 indicates that the secondary cell with ServCellIndex i has not detected a beam failure, or has detected a beam failure but has not yet completed candidate beam evaluation according to its needs, and no bytes containing the AC field exist. If present, the bytes containing the AC field appear in ascending order of ServCellIndex. The number of bytes containing the AC field may be 0, and does not exceed the size of the available grant.

[0048] The above is an exemplary description of the (Truncated) BFR MAC CE, and the following describes a related scenario of an embodiment of the present invention. In the embodiment of the present invention, a beam may be replaced by a reference signal (RS), for example, represented by SSB or CSI-RS.

[0049] 4 is a diagram illustrating a multi-TRP scenario according to an embodiment of the present invention. A TRP may be part of a network device (e.g., a gNB) that receives signals from a terminal device, or may be part of a network device (e.g., a gNB) that transmits signals to a terminal device. A TRP may also represent a set of Downlink Control Information (DCI) or a set of reference signals.

[0050] As shown in Figure 4, in a multi-TRP operation scenario, a terminal device may have panel 1 (pannel-1) and panel 2 (pannel-2), and one serving cell can schedule the terminal device from two TRPs to provide better Physical Downlink Share Channel (PDSCH) coverage, reliability and / or data rate.

[0051] In the case of multi-TRP operation, there may be two different operation modes: single DCI and multi-DCI. For these two modes, uplink and downlink operation is controlled by the physical layer and medium access control (MAC). In the single DCI mode, the terminal device is scheduled by two TRPs using the same DCI; in the multi-DCI mode, the terminal device is scheduled by a separate DCI for each TRP. Alternatively, the network device serves the terminal by TRP-1 and TRP-2. The two TRPs may belong to the same cell or to different cells.

[0052] For TRP-specific beam failure recovery triggering, for each serving cell configured with beam failure detection, the MAC entity does the following:

[0053] If multiple BFD-RS pairs are configured for this serving cell, for each BFD-RS pair for this serving cell, the MAC entity shall: When a beam failure instance indication for one BFD-RS pair is received from the lower layer, start or restart the beam failure detection timer beamFailureDetectionTimer and increment BFI_COUNTER by 1; Trigger a BFR for this BFD-RS pair in this serving cell if BFI_COUNTER is greater than or equal to beamFailureInstanceMaxCount; When BFR is triggered in both of the two BFD-RS pairs of this serving cell and this BFR is suspended, if this serving cell is a special cell (SpCell), start a random access procedure in this special cell, and when this serving cell is a special cell and the random access procedure started for beam failure recovery of the two BFD-RS pairs of this special cell is completed successfully, set BFI_COUNTER of each BFD-RS pair of the special cell to 0, and consider the beam failure recovery procedure to be completed successfully; Set BFI_COUNTER to 0 if the beamFailureDetectionTimer for this BFD-RS pair has expired or if higher layers have reconfigured the beamFailureDetectionTimer, beamFailureInstanceMaxCount, or any reference signals for beam failure detection for this serving cell or this BFD-RS pair; and If a PDCCH addressed to one C-RNTI is received that indicates a new transmission uplink grant of one of the HARQ processes for transmitting an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE containing beam failure recovery information for this BFD-RS set of this serving cell, or if the secondary cell is deactivated, set BFI_COUNTER to 0.

[0054] When one MAC PDU is transmitted and this PDU contains one Enhanced BFR MAC CE or Truncated Enhanced BFR MAC CE, and it contains beam failure recovery information of one BFD-RS of a secondary cell, all triggered BFRs of this BFD-RS of this secondary cell are canceled.

[0055] The beam failure recovery MAC CEs in a BFD-RS pair include an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE. The Enhanced BFR MAC CE supports single-byte bitmap (7 Ci bits and 1 SP bit) and 4-byte bitmap (31 Ci bits and 1 SP bit) formats.

[0056] The Enhanced BFR MAC CE includes the following information: a Ci / SP field to determine the serving cell of the failed TRP; an AC field to indicate whether a candidate beam of one of the failed TRPs of the serving cell is available; and a Candidate RS ID field to indicate a candidate beam of one of the failed TRPs (if available).

[0057] The inventors have discovered that when beam failures are detected in both TRPs of one special cell, the terminal device must initiate a random access procedure and transmit beam failure recovery information including the two TRPs that need recovery in MSG3 / MSGA. The BFR MAC CE carrying the beam failure recovery information including the two TRPs that need recovery requires at least five bytes, e.g., a 2-byte subheader, a 1-byte bitmap, a 1-byte beam failure recovery information for the failed TRP1, and a 1-byte beam failure recovery information for the failed TRP2. If a minimum size of 7 bytes of MSG3 is available, it must contain at least a 2-byte C-RNTI MAC CE and its header (1 byte), and the remaining 4 bytes are not enough to carry the BFR MAC CE, which requires at least 5 bytes.

[0058] In view of the above problems, the present invention will be described below in conjunction with an embodiment.

[0059] <Example of the first aspect> In an embodiment of the present invention, a beam failure recovery information transmission method is provided, and will be described from the terminal device side.

[0060] 5 is a diagram illustrating a beam failure recovery information transmission method according to an embodiment of the present invention. As shown in FIG. 5, the method includes the following steps:

[0061] 501: The terminal device detects beam failures at both TRPs of the special cell; and 502: The terminal device sends a first message in a random access procedure to a network device, the first message including a first beam failure recovery MAC CE of fixed size, and the first beam failure recovery MAC CE includes beam failure recovery information of the two TRPs.

[0062] Note that, although the above-mentioned FIG. 5 exemplifies an embodiment of the present invention, the present invention is not limited thereto. For example, the execution order of each operation (step) may be appropriately adjusted, or some other operations may be added or removed. Those skilled in the art may make appropriate modifications to the above content without being limited to the description of the above-mentioned FIG. 5.

[0063] In some embodiments, one special cell may be configured with two BFD-RS sets (corresponding to the two TRPs), and hereinafter, for convenience of explanation, the two TRPs are referred to as the first TRP and the second TRP, and the two BFD-RS sets are referred to as the first BFD-RS set associated with the first TRP and the second BFD-RS set associated with the second TRP.

[0064] In some embodiments, in 501, a terminal device detecting beam failure at all two TRPs of a special cell means that the terminal device detects beam failure at the first TRP (or beam failure has occurred at the first BFD-RS pair) and also detects beam failure at the second TRP (or beam failure has also occurred at the second BFD-RS pair), but the present invention does not limit the order in which beam failure is detected at the first TRP and beam failure is detected at the second TRP.

[0065] In some embodiments, the terminal device detects a beam failure in the first TRP, which means that it receives a beam failure instance indication of the first BFD-RS set from the lower layer, starts or restarts the beam failure detection timer beamFailureDetectionTimer, increments the terminal device variable BFI_COUNTER by 1, and BFI_COUNTER is greater than or equal to the beam failure instance maximum count value beamFailureInstanceMaxCount. The terminal device detects a beam failure in the second TRP, which means that it receives a beam failure instance indication of the second BFD-RS set from the lower layer, starts or restarts the beam failure detection timer beamFailureDetectionTimer, increments the terminal device variable BFI_COUNTER by 1, and BFI_COUNTER is greater than or equal to the beam failure instance maximum count value beamFailureInstanceMaxCount.

[0066] In some embodiments, since the serving cell is a special cell, when beam failure is detected in both TRPs, the terminal device needs to initiate a random access procedure. The random access procedure may be a traditional contention-based random access, including two interactions between the network device and the terminal device: in the first interaction, the terminal device initiates a random access request (MSG1) and receives a random access response feedback from the network device (MSG2); in the second interaction, the terminal device sends information including a user identifier to the network device (MSG3) and receives a feedback from the network device, MSG4; or the random access procedure may be a two-step random count, that is, the original MSG1 and MSG3 are merged as a new MSGA, and MSG2 and MSG4 are merged as a new MSGB. For details, please refer to the prior art, and detailed descriptions thereof will be omitted here.

[0067] In some embodiments, at 502, the terminal device transmits a first message in a random access procedure to a network device, the first message including a fixed-size first beam failure recovery MAC CE rather than a variable-size BFR MAC CE, thereby allowing the first message in the random access procedure to carry beam failure recovery information for two TRPs with sufficiently low overhead for the network to perform beam recovery.

[0068] In some embodiments, the first message may include MSG3 or MSGA, which carries the first beam failure recovery MAC CE. The format of the first beam failure recovery MAC CE is described below.

[0069] First, the MAC subheader of the first beam failure recovery MAC CE will be described.

[0070] In some embodiments, the first MAC subheader corresponding to the first beam failure recovery MAC CE includes at least a first LCID, the first LCID is for indicating (used to indicate) a fixed-size first beam failure recovery MAC CE, the first LCID is 6 bits, and optionally the first MAC subheader may further include two reserved bits, and such a first MAC subheader may be 1 byte. Figure 6 is a diagram showing an example of the first MAC subheader.

[0071] As shown in Figure 6, for example, the value of the first LCID is a reserved value of the LCID of the UL-SCH, for example, one of 35, 36, 43 and 44. In other words, when a network device receives one MAC CE and the value of the LCID in the MAC subheader therein is a reserved value of the LCID, for example, one of 35, 36, 43 and 44, it can indicate that the MAC CE is a fixed-size first beam failure recovery MAC CE.

[0072] In some embodiments, the first MAC subheader corresponding to the first beam failure recovery MAC CE includes at least a first LCID and a first eLCID, the first LCID is for indicating an extended LCID field, the first eLCID is for indicating a fixed-size first beam failure recovery MAC CE, the first LCID is 6 bits, the first eLCID is 8 bits, and optionally, the first MAC subheader may further include two reserved bits, and such a first MAC subheader may be 2 bytes. Figure 7 shows an example of the first MAC subheader.

[0073] As shown in Figure 7, for example, the value of the first LCID is 33 or 34, which indicates an extended LCID range, and the value of the first eLCID is a reserved value of the eLCID of the UL-SCH, for example, one of 0 to 249. In other words, when a network device receives one MAC CE, in which the value of LCID in the MAC subheader is 33 or 34 and the value of eLCID is a reserved value, for example, one of 0 to 249, it can indicate that the MAC CE is a fixed-size first beam failure recovery MAC CE.

[0074] In some embodiments, the size of the first beam failure recovery MAC CE is fixed and not variable, so the first MAC subheader may not indicate a length (L) bit, or the first MAC subheader does not require a length bit.

[0075] The format of the first beam failure recovery MAC CE will be described below.

[0076] In some embodiments, the first beam failure recovery MAC CE includes at least an AC field, a candidate reference signal ID field, or a reserved bit field, wherein the AC field is used to indicate whether a candidate beam of one failed TRP of the special cell is available, the AC field is 1 bit, the candidate reference signal ID field is used to indicate one candidate beam of the failed TRP, the candidate reference signal ID field is an index of SSB or CSI-RS, and the candidate reference signal ID field or reserved bit field is 6 bits, for example, when the value of the AC field is 1, it indicates that the candidate beam of the one failed TRP is available, and the first beam failure recovery MAC CE includes the candidate reference signal ID field, and when the value of the AC field is 0, it indicates that the candidate beam of the one failed TRP is unavailable (unusable), and the first beam failure recovery MAC CE includes the reserved bit field.

[0077] In some embodiments, Figure 8 illustrates the format of the first beam failure recovery MAC CE. As shown in Figure 8, the first beam failure recovery MAC CE only includes an AC field, a candidate reference signal ID field, or a reserved bit field, and the remaining bit digits are reserved bits R. The terminal device and the network device can consider that the first AC byte corresponds to the beam failure recovery information of the first TRP of the special cell, and the second AC byte corresponds to the beam failure recovery information of the second TRP of the special cell, or vice versa. The present invention is not limited thereto. The subheader of the BFR MAC CE shown in Figure 8 can use the subheader format shown in Figure 6 or Figure 7.

[0078] In some embodiments, the first beam failure recovery MAC CE may further include a TRP information field, the size of which is 1 bit, and the TRP information field is used to indicate the failed TRP of the two TRPs or to indicate the BFD-RS pair of the special cell in which beam failure is detected. In other words, it includes at least an AC field, a candidate reference signal ID field or a reserved bit field, and a TRP information field. The meanings of the AC field and the candidate reference signal ID field or the reserved bit field are as described above, and detailed description thereof will be omitted here.

[0079] For example, the TRP information field is used to indicate the failed TRP of the two TRPs, and the value of the TRP information field is the index of the TRP in which beam failure is detected, or the index of the beam failure detection reference signal (BFD-RS) set associated with the index of the TRP in which beam failure is detected, or the index of the associated control resource set pool (coreset pool). A setting of 0 in the TRP field indicates that beam failure is detected in the first TRP of the special cell (or that beam failure is detected in the BFD-RS set with index 0 of the special cell, or that beam failure is detected in the coreset pool with index 0), and a setting of 1 in the TRP field indicates that beam failure is detected in the second TRP of the special cell (or that beam failure is detected in the BFD-RS set with index 1 of the special cell, or that beam failure is detected in the coreset pool with index 1). Figure 9 shows an example of the format of the first beam failure recovery MAC CE. As shown in FIG. 9, the first beam failure recovery MAC CE only includes an AC field, a candidate reference signal ID field or a reserved bit field, and a TRP information field.

[0080] For example, the TRP information field indicates whether a beam failure has been detected in the TRP with index i (or whether a beam failure has been detected in the BFD-RS set with index i of the special cell, or whether a beam failure has been detected in the coreset pool with index i), hereinafter abbreviated as the TRPi information field, where TRPi indicates whether a beam failure has been detected in the BFD-RS set i of the special cell, and when the value of the TRP information field is a first value, it indicates that no beam failure has been detected in the TRPi (or the BFD-RS set i or the coreset pool i), and when the value of the TRP information field is a second value, it indicates that a beam failure has been detected in the TRPi (or the BFD-RS set i or the coreset pool i). For example, when the TRPi field is set to 0, it indicates that no beam failure has been detected in the BFD-RS set i (or coreset pooli) of the first TRP (TRP0) or the special cell, and when the TRPi field is set to 1, it indicates that a beam failure has been detected in the BFD-RS set i (or coreset pooli) of the second TRP (TRP1) or the special cell, and vice versa. Figure 10 is a diagram showing an example of the format of the first beam failure recovery MAC CE. As shown in Figure 10, the first beam failure recovery MAC CE only includes the AC field, the candidate reference signal ID field or reserved bit field, and the TRPi information field, and the subheader of the BFR MAC CE shown in Figures 9 and 10 can use the subheader format shown in Figure 6 or Figure 7.

[0081] In some embodiments, the first beam failure recovery MAC CE may further include a Ci / SP field, which is used to determine the serving cell of the failed TRP and is 1 byte in size. The SP field indicates beam failure detection of the TRP of the dedicated cell of this MAC entity. A value of 1 in the SP field indicates beam failure in the TRP of the dedicated cell; otherwise, it is set to 0. The Ci field indicates beam failure detection (of the TRP) of the secondary cell with ServCellIndex i. A value of 1 in the Ci field indicates beam failure detection (of the TRP) of the secondary cell with ServCellIndex i. A value of 0 in the Ci field indicates no beam failure detection (of the TRP) of the secondary cell with ServCellIndex i.

[0082] For example, Figure 11 shows the format of the first beam failure recovery MAC CE. As shown in Figure 11, the first beam failure recovery MAC CE may only include an AC field, a candidate reference signal ID field or a reserved bit field, a Ci / SP field, and a TRP information field. The meaning of each field is as described above, and a detailed description thereof will be omitted here.

[0083] For example, Figure 12 shows the format of the first beam failure recovery MAC CE. As shown in Figure 12, the first beam failure recovery MAC CE may only include an AC field, a candidate reference signal ID field or a reserved bit field, a Ci / SP field, and a TRPi information field. The meaning of each field is as described above, and a detailed description thereof will be omitted here.

[0084] For example, the TRP information field or the TRPi information field in Figure 11 or 12 may be replaced with a reserved bit R. Figure 13 is a diagram showing the format of the first beam failure recovery MAC CE. As shown in Figure 13, the first beam failure recovery MAC CE may only include an AC field, a candidate reference signal ID field or a reserved bit field, and a Ci / SP field, and the terminal device and the network device may consider that the first AC byte corresponds to the beam failure recovery information of the first TRP of the special cell, and the second AC byte corresponds to the beam failure recovery information of the second TRP of the special cell, or vice versa, but the present invention is not limited thereto. The subheader of the BFR MAC CE shown in Figures 11 to 13 may use the subheader format shown in Figure 6.

[0085] In some embodiments, the method may further include at least one of the following (optional; not shown):

[0086] Detecting that the uplink grant or configured uplink resources indicated by the RAR received by the terminal device are insufficient to carry a truncated BFR MAC CE including beam failure recovery information for two failed TRPs; The terminal device receives first instruction information transmitted by the network device; The terminal device detects that the highest serving cell index ServCellIndex of the secondary cell in which the TRP in which the beam failure is detected is located / associated is less than 8; and The special cell where the beam-failed TRP is located is indicated to be in a Truncated BFR MAC CE, and the result of the logical channel priority processing LCP has detected that "the UL-SCH resource cannot accommodate the 4-byte bitmap Truncated BFR MAC CE plus its subheader."

[0087] In some embodiments, when at least one of the above occurs, the first message includes a first beam failure recovery MAC CE.

[0088] For example, the first indication information may be represented by 1 bit and is used to indicate that there is little resource to accommodate the first message, or to indicate that the first message carries minimum data, or to indicate that the first message includes a first beam failure recovery MAC CE. The first indication information is included in the RAR, the UL grant of the RAR, or the DCI scheduling the RAR, and is not limited thereto in the embodiments of the present invention.

[0089] As can be seen from the above embodiment, the terminal device sends a first message in the random access procedure to the network device, and the first message includes a first beam failure recovery MAC CE with a fixed size, rather than a BFR MAC CE with a variable size, so that the first message in the random access procedure can carry beam failure recovery information of two TRPs with sufficiently small overhead for the network to perform beam recovery.

[0090] <Example of the second aspect> In an embodiment of the present invention, a beam failure recovery information transmission method is provided, and will be described from the terminal device side.

[0091] 14 is a diagram showing a beam failure recovery information transmission method in this embodiment. As shown in FIG. 14, the method includes the following steps:

[0092] 1401: The terminal device detects beam failures in all two TRPs of the special cell; and 1402: The terminal device sends a first message in a random access procedure to a network device, the first message including a second beam failure recovery MAC CE, and the second beam failure recovery MAC CE includes beam failure recovery information of a first TRP of the two TRPs.

[0093] In some embodiments, for some implementation methods of 1401-1402, please refer to 501-502 above, and redundant explanations will be omitted here. The differences from the embodiments of the first aspect are as follows: the first message contains a second beam failure recovery MAC CE, not a first beam failure recovery MAC CE, which will be described in detail below.

[0094] In some embodiments, in 1401, the terminal device detects beam failures in both the first TRP and the second TRP of the special cell, and in 1402, the terminal device initiates a random access procedure in the random access resource of the second TRP of the two TRPs, and the first message includes a second beam failure recovery MAC CE, and the second beam failure recovery MAC CE includes beam failure recovery information of the first TRP. Thus, the first message of the random access procedure can carry the beam failure recovery information of one TRP and indicate the beam failure recovery information of another TRP in an implicit manner so that the network can perform beam recovery. In addition, in this embodiment, the format of the conventional BFR MAC CE can be reused, which is low cost.

[0095] Hereinafter, we will first explain how to indicate the beam failure recovery information of another TRP in an implicit manner.

[0096] In some embodiments, the method may further include (not shown):

[0097] The terminal device receives candidate beam configuration information sent by the network device, and the configuration information includes TRP-related information, which is the index of a failed TRP, or the index of a BFD-RS set in which a beam failure is detected, or the index of a coreset pool associated with the BFD-RS set in which a beam failure is detected; or the index of a TRP in which a candidate beam or random access resource is located, or the index of a BFD-RS set corresponding to the TRP, or the index of a coreset pool associated with the BFD-RS set.

[0098] For example, the candidate beam configuration information may be represented by a field candidateBeamRSList, candidateBeamRSListExt-v1610, or one new field candidateBeamRSListExt-v17, which list calls for multiple PRACH-ResourceDedicatedBFR information elements containing reference signals and their corresponding dedicated random access resources and / or dedicated random access preambles, and to which TRP-related information (e.g., the index of the failed TRP, or the index of the BFD-RS set in which the beam failure is detected, or the index of the coreset pool associated with the BFD-RS set in which the beam failure is detected; or the index of the TRP in which the candidate beam or random access resource is located, or the index of the BFD-RS set corresponding to this TRP, or the index of the coreset pool associated with this BFD-RS set) is added. The PRACH-ResourceDedicatedBFR information element can select between SSB and CSI-RS, and thus the candidate beam configuration information includes SSB / CSI-RS, TRP-related information, and a dedicated random access resource and / or a dedicated random access preamble. This allows the random access resource to be associated with the TRP, so that the second TRP can be implicitly indicated using the random access resource associated with the second TRP used by the terminal device.

[0099] In some embodiments, the terminal device can transmit a random access preamble in an RO corresponding to a first downlink reference signal, which corresponds to the second TRP. In other words, in the random access procedure, the MAC entity selects a first downlink reference signal associated with the second TRP and transmits a random access preamble in an RO corresponding to the first downlink reference signal, thereby implicitly indicating the beam failure recovery information of the second TRP.

[0100] The format of the second beam failure recovery MAC CE is described below.

[0101] First, the MAC subheader of the second beam failure recovery MAC CE will be described.

[0102] In some embodiments, the second MAC subheader corresponding to the second beam failure recovery MAC CE includes at least a second LCID, which is for indicating a single bitmap BFR MAC CE or a single bitmap Truncated BFR MAC CE or an enhanced BFR MAC CE, and the second LCID is 6 bits, and optionally the second MAC subheader may further include two reserved bits. Figure 15 shows an example of the second MAC subheader.

[0103] As shown in FIG. 15, for example, the value of the second LCID is 50, which indicates reusing the MAC CE format of a conventional (e.g., Rel-16) single-bitmap BFR, or the value of the second LCID is 51, which indicates reusing the MAC CE format of a conventional (e.g., Rel-16) single-bitmap Truncated BFR, and the value of the second LCID is any one of the reserved values ​​35-44, which indicates using the enhanced BFR MAC CE format, or the value of the second LCID is equal to the LCID value indicating the enhanced BFR MAC CE format.

[0104] In some embodiments, the second MAC subheader corresponding to the second beam failure recovery MAC CE includes at least a second LCID and a second eLCID, where the second LCID is for indicating an extended LCID field, the second eLCID is for indicating a beam failure recovery MAC CE, the second LCID is 6 bits, the second eLCID is 8 bits, and optionally, the second MAC subheader may further include two reserved bits. Figure 16 shows an example of the second MAC subheader.

[0105] As shown in FIG. 16, for example, a value of 33 or 34 for the second LCID indicates an extended LCID field, a value of 250 for the second eLCID indicates a MAC CE for a BFR with a 4-bitmap length, or a value of 251 for the second eLCID indicates a MAC CE for a Truncated BFR with a 4-bitmap length.

[0106] In some embodiments, since the second beam failure recovery MAC CE is not fixed in size, as shown in Figures 15 and 16, the second MAC subheader may further include bit information for indicating the length, which indicates the length of the corresponding MAC SDU or variable-sized MAC CE.

[0107] The format of the second beam failure recovery MAC CE will be described below.

[0108] In some embodiments, the second beam failure recovery MAC CE can reuse the format of a conventional (e.g., Rel-16) single-bitmap BFR MAC CE or the format of a single-bitmap Truncated BFR MAC CE, or can use the format of an enhanced BFR MAC CE.

[0109] For example, the second beam failure recovery MAC CE includes an AC field, a candidate reference signal ID field or a reserved bit field, and a Ci / SP field, where the AC field is for indicating whether a candidate beam of one failed TRP of the special cell is available or for indicating whether a candidate reference signal ID field exists, the AC field is 1 bit, the candidate reference signal ID field is used to indicate one candidate beam of the failed TRP, the candidate reference signal ID field is an index of SSB or CSI-RS, the candidate reference signal ID field or reserved bit field is 6 bits, for example, when the value of the AC field is 1, it indicates that the candidate beam of the one failed TRP is available, the second beam failure recovery MAC CE includes a candidate reference signal ID field, and when the value of the AC field is 0, it indicates that the candidate beam of the one failed TRP is unavailable, and the second beam failure recovery MAC CE includes a reserved bit field. The Ci / SP field is used to determine the serving cell of the failed TRP and is 1 byte in size. The SP field indicates the beam failure detection of the TRP of the dedicated cell of this MAC entity. If the SP field is set to 1, it indicates the beam failure of the TRP of the dedicated cell; otherwise, it is set to 0. The Ci field indicates the beam failure detection (of the TRP) of the secondary cell with ServCellIndex i. If the Ci field is set to 1, it indicates that the beam failure is detected (of the TRP) of the secondary cell with ServCellIndex i. If the Ci field is set to 0, it indicates that the beam failure is not detected (of the TRP) of the secondary cell with ServCellIndex i.

[0110] In some embodiments, Figure 17A illustrates the format of the second beam failure recovery MAC CE. As shown in Figure 17A, the second beam failure recovery MAC CE includes only the AC field, the candidate reference signal ID field or the reserved bit field, and the Ci / SP field, and the remaining bit digits are reserved bits R. The terminal device and the network device can assume that the beam failure recovery information of the first TRP is included in the second beam failure recovery MAC CE and that the beam failure recovery information of the second TRP is implicitly indicated by the random access resource used for this random access procedure. In other words, the network device can obtain the beam failure information of the second TRP through the random access resource. When two TRPs are configured in a special cell, it can directly determine that the first TRP corresponding to the second beam failure recovery MAC CE is another TRP other than the second TRP. There is no need to configure the TRP information field in Figure 17B to explicitly indicate the first TRP. The subheader of the BFR MAC CE shown in Figure 17A can use the subheader format shown in Figure 15.

[0111] In some embodiments, the second beam failure recovery MAC CE may further include a TRP information field, the size of which is 1 bit, for indicating the failed first TRP, or for indicating the BFD-RS set or coreset pool in which beam failure is detected in the special cell, where the BFD-RS set or coreset pool corresponds to the first TRP. In other words, it includes at least an AC field, a candidate reference signal ID field or reserved bit field, a Ci / SP field, and a TRP information field, where the meanings of the AC field, the candidate reference signal ID field or reserved bit field, and the Ci / SP field are as described above, and detailed description thereof will be omitted here.

[0112] For example, the TRP information field is for indicating a failed first TRP, or for indicating a BFD-RS set or coreset pool in which beam failure has been detected in a special cell, where the BFD-RS set or coreset pool corresponds to the first TRP, hereinafter abbreviated as TRP information field, and the TRP field indicates that beam failure has been detected in the first TRP, or that beam failure has been detected in the BFD-RS set (or coreset pool) i of the special cell, where a setting of the TRP field to 0 indicates that beam failure has been detected in TRP0 (the first TRP) or the BFD-RS set (or coreset pool) 0 of the special cell, and a setting of the TRP field to 1 indicates that beam failure has been detected in TRP1 (the first TRP) or the BFD-RS set (or coreset pool) 1 of the special cell. Figure 17B is a diagram showing an example of the format of the second BFR MAC CE. As shown in Figure 17B, the second BFR MAC CE only includes an AC field, a candidate reference signal ID field or a reserved bit field, a Ci / SP field, and a TRP information field, and the subheader of the BFR MAC CE shown in Figure 17B can use the subheader format shown in Figure 15.

[0113] In some embodiments, the differences from Figures 17A and 17B are as follows: the second beam failure recovery MAC CE may not include the Ci / SP field, and Figure 18A is a diagram showing one format of the second beam failure recovery MAC CE. As shown in Figure 18A, the second beam failure recovery MAC CE may only include the AC field, the candidate reference signal ID field, or the reserved bit field. The meanings of the AC field, the candidate reference signal ID field, and the reserved bit field are the same as those in Figure 17A, and detailed descriptions thereof will be omitted here. Figure 18B is another diagram showing the format of the second beam failure recovery MAC CE. As shown in Figure 18B, the second beam failure recovery MAC CE may only include the AC field, the candidate reference signal ID field or the reserved bit field, and the TRP information field. The meanings of the AC field, the candidate reference signal ID field or the reserved bit field, and the TRP information field are the same as those in Figure 17B, and detailed descriptions thereof will be omitted here. The subheader of the BFR MAC CE shown in FIGS. 18A and 18B can use the subheader format shown in FIG. 15 or 16, and the embodiment of the present invention is not limited thereto.

[0114] In some embodiments, the method may further include at least one of the following (optional; not shown):

[0115] Detecting that the uplink grant or configured uplink resources indicated by the RAR received by the terminal device are insufficient to carry an enhanced BFR MAC CE including beam failure recovery information of two failed TRPs; The terminal device receives first instruction information transmitted by the network device; The terminal device detects that the highest serving cell index ServCellIndex of the secondary cell in which the TRP in which the beam failure is detected is located / associated is less than 8; and The special cell where the beam-failed TRP is located is indicated to be in a Truncated BFR MAC CE, and the result of the logical channel priority processing LCP has detected that "the UL-SCH resource cannot accommodate the 4-byte bitmap Truncated BFR MAC CE plus its subheader."

[0116] In some embodiments, when at least one of the above occurs, the first message includes a second beam failure recovery MAC CE.

[0117] For example, the first indication information may be represented by 1 bit and is used to indicate that there is little resource to accommodate the first message, or to indicate that the first message carries minimum data, or to indicate that the first message includes a second beam failure recovery MAC CE. The first indication information is included in the RAR, the UL grant of the RAR, or the DCI scheduling the RAR, and the embodiment of the present invention is not limited thereto.

[0118] Note that, although the above-mentioned FIG. 14 exemplifies an embodiment of the present invention, the present invention is not limited thereto. For example, the execution order of each operation (step) may be appropriately adjusted, or some other operations may be added or removed. Those skilled in the art may make appropriate modifications to the above content without being limited to the description of the above-mentioned FIG. 14.

[0119] As can be seen from the above embodiment, the terminal device sends a first message in the random access procedure to the network device, and the first message includes beam failure recovery information of one TRP, so that the first message of the random access procedure can carry the beam failure recovery information of one TRP and indicate the beam failure recovery information of another TRP in an implicit manner, so that the network can perform beam recovery. In addition, this embodiment can reuse the format of the conventional BFR MAC CE, and the cost is low.

[0120] <Example of the third aspect> An embodiment of the present invention provides a beam failure recovery information receiving method, which is explained from the network device side.

[0121] 19 is a diagram illustrating a method for receiving beam failure recovery information in an embodiment of the present invention. As shown in FIG. 19, the method includes the following steps:

[0122] 1901: A network device transmits candidate beam setting information to a terminal device; and 1902: The network device receives a first message in a random access procedure transmitted by the terminal device, the first message including a first beam failure recovery MAC CE of fixed size, or the first message including a second beam failure recovery MAC CE, the first beam failure recovery MAC CE including beam failure recovery information of two TRPs, and the second beam failure recovery MAC CE including beam failure recovery information of the first TRP of the two TRPs.

[0123] In some embodiments, in 1901, the configuration information includes TRP-related information, which is an index of a failed TRP, or an index of a BFD-RS set in which a beam failure is detected, or an index of a coreset pool associated with a BFD-RS set in which a beam failure is detected; or an index of a TRP in which a candidate beam or random access resource is located.

[0124] In some embodiments, the implementation method of 1902 can refer to 502 and 1402 in the embodiments of the first and second aspects, and the description of the format of the first beam failure recovery MAC CE and the second beam failure recovery MAC CE will be omitted here.

[0125] As can be seen from the above embodiment, when beam failures are detected in both TRPs, a fixed-size BFR MAC CE containing beam failure recovery information for the two TRPs that need recovery is transmitted in the random access procedure, or a BFR MAC CE containing beam failure recovery information for one TRP that needs recovery is transmitted. This allows Msg3 / MSGA in the random access procedure to transmit beam failure recovery information for one or two TRPs with sufficiently low overhead, and the network device can know the beam failure recovery information for the two TRPs and perform beam recovery.

[0126] <Example of the fourth aspect> 20 is a diagram illustrating a beam failure recovery method in an embodiment of the present invention. As shown in FIG. 20, the method includes the following steps:

[0127] 2001: When a beam failure recovery (BFR) is triggered, the terminal device suspends the BFR or the BFR is suspended.

[0128] Note that, although the above-mentioned FIG. 20 exemplifies an embodiment of the present invention, the present invention is not limited thereto. For example, some operations (operations) may be added or removed. Those skilled in the art can make appropriate modifications to the above content without being limited to the description of the above-mentioned FIG. 20.

[0129] In some embodiments, the method further includes: triggering beam failure recovery when beam failure is detected, which includes: when receiving a beam failure instance indication from a lower layer, starting or restarting a beam failure detection timer beamFailureDetectionTimer, incrementing a terminal device variable BFI_COUNTER by 1, and when BFI_COUNTER is greater than or equal to a beam failure instance maximum count value beamFailureInstanceMaxCount, beam failure is detected and triggering beam failure recovery (BFR, Beam Failure Recovery) of the secondary cell; and in 2001, when the BFR is triggered, the terminal device suspends the BFR or the BFR is suspended.

[0130] In some embodiments, the BFR remains suspended until canceled or successfully completed.

[0131] In some embodiments, successful completion of BFR includes the following: when a PDCCH is received indicating an uplink grant for a new transmission of an HARQ process addressed to a C-RNTI, the BFR is successfully completed, where the HARQ process is for transmitting an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the Enhanced BFR MAC CE or the Truncated Enhanced BFR MAC CE includes BFR information. In other words, when a beam failure recovery (BFR) is triggered, the terminal device suspends the BFR or the BFR is suspended, and receives one PDCCH indicating an uplink grant for a new transmission of an HARQ process addressed to the C-RNTI, and the HARQ process is for transmitting an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the Enhanced BFR MAC CE or the Truncated Enhanced BFR MAC CE includes the BFR information, then the BFR is completed successfully, and the BFR suspension ends or the BFR is no longer suspended.

[0132] In some embodiments, the BFR may be cell-specific or TRP-specific.

[0133] In some embodiments, when the BFR is dedicated to a TRP, the successful completion of the TRP-dedicated BFR includes the successful completion of the TRP-dedicated BFR when a PDCCH is received indicating an uplink grant for a new transmission of an HARQ process addressed to a C-RNTI, where the HARQ process is for transmitting an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the Enhanced BFR MAC CE or the Truncated Enhanced BFR MAC CE includes BFR information dedicated to the TRP. In other words, when a beam failure recovery (BFR) is triggered, the terminal device suspends the BFR, or the BFR is suspended, and receives one PDCCH indicating an uplink grant for a new transmission of an HARQ process addressed to the C-RNTI, and the HARQ process is for transmitting an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the Enhanced BFR MAC CE or the Truncated Enhanced BFR MAC CE includes BFR information dedicated to the TRP, then the BFR is completed successfully, and the BFR suspension ends (stops) or the BFR is no longer suspended.

[0134] In some embodiments, the method may further include:

[0135] The terminal device receives one PDCCH addressed to the C-RNTI indicating an uplink grant for a new transmission of an HARQ process, wherein the HARQ process is for transmitting an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the Enhanced BFR MAC CE or the Truncated Enhanced BFR MAC CE includes the BFR information or the BFR information dedicated to the TRP.

[0136] In some embodiments, when beam failure is detected in two TRPs of a secondary cell, the BFRs of the two TRPs are suspended.

[0137] In some embodiments, when a MAC PDU is transmitted and the PDU includes an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a special cell, all triggered BFRs of the BFD-RS set of the special cell are canceled, and at this time, the BFRs are no longer suspended or are no longer suspended.

[0138] In some embodiments, when a MAC PDU is transmitted and the PDU includes an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a serving cell, all triggered BFRs of the BFD-RS set of the serving cell are canceled, at which time the BFR suspension ends or the BFR is no longer suspended.

[0139] In some embodiments, a MAC PDU is transmitted, and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE containing beam failure information of a secondary cell, and all triggered BFRs of all BFD-RS sets of the secondary cell are canceled, at which time the BFRs are terminated or are no longer suspended.

[0140] In some embodiments, when a MAC PDU is transmitted and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a secondary cell, all triggered BFRs of the BFD-RS set of the secondary cell are canceled, at which time the BFR suspension ends or the BFR is no longer suspended.

[0141] In some embodiments, when a MAC PDU is transmitted and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a special cell, all triggered BFRs of the BFD-RS set of the special cell are canceled, at which time the BFRs cease to be suspended or are no longer suspended.

[0142] In some embodiments, when a MAC PDU is transmitted and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a serving cell, all triggered BFRs of the BFD-RS set of the serving cell are canceled, at which time the BFR suspension ends or the BFR is no longer suspended.

[0143] The above-described embodiments of the first aspect, the second aspect, and the fourth aspect may be implemented alone or in combination, and the embodiments of the present invention are not limited to these.

[0144] <Example of the fifth aspect> An embodiment of the present invention provides a beam failure recovery information transmission device, which may be, for example, a terminal device, or one or more parts or components disposed in the terminal device, and the description of the same content as in the embodiment of the first or second aspect will be omitted here.

[0145] 21 is a diagram showing a beam failure recovery information transmitting device in an embodiment of the present invention. As shown in FIG. 21, a beam failure recovery information transmitting device 2100 includes:

[0146] A detection unit 2101: detecting beam failures at two transmit / receive points (TRPs) of the special cell; and First transmitting unit 2102: Transmits a first message in a random access procedure to a network device, the first message including a first beam failure recovery medium access control (MAC) control unit (CE) of fixed size, or the first message including a second beam failure recovery MAC CE, the first beam failure recovery MAC CE including beam failure recovery information of the two TRPs, and the second beam failure recovery MAC CE including beam failure recovery information of the first TRP of the two TRPs.

[0147] In some embodiments, the implementation manner of the detecting unit 2101 and the first sending unit 2102 can refer to the above 501-502, 1401-1402, and the detailed description thereof will be omitted here.

[0148] In some embodiments, the first message includes MSG3 or MSGA.

[0149] In some embodiments, the implementation manner of the first beam failure recovery MAC CE and the second beam failure recovery MAC CE can refer to the embodiments of the first or second aspect, and detailed description thereof will be omitted here.

[0150] In some embodiments, the first transmitting unit initiates the random access procedure on a random access resource of a second TRP of the two TRPs.

[0151] In some embodiments, the first transmitting unit is further used to transmit a random access preamble in a random access channel opportunity (RO) corresponding to a first downlink reference signal, and the first downlink reference signal corresponds to the second TRP.

[0152] In some embodiments, the apparatus may further include:

[0153] First receiving unit (not shown; optional): receives candidate beam configuration information sent by the network device, the configuration information including TRP-related information, which is the index of a failed TRP, or the index of a BFD-RS set in which a beam failure is detected, or the index of a coreset pool associated with the BFD-RS set in which a beam failure is detected; or the index of a TRP in which a candidate beam or random access resource is located, or the index of a BFD-RS set corresponding to the TRP, or the index of a coreset pool associated with the BFD-RS set.

[0154] In some embodiments, the device may further include at least one of the following (not shown; optional):

[0155] A second receiving unit: receives an RAR, and the uplink grant or configured uplink resource indicated by the RAR is insufficient to carry an enhanced beam failure recovery MAC CE including beam failure recovery information of two failed TRPs; A third receiving unit receives first indication information transmitted by the network device; A first detection unit: detects that the highest serving cell index ServCellIndex of the secondary cell in which the TRP in which the beam failure is detected is located / associated is less than 8; and Second detection unit: The second detection unit detects that the special cell in which the TRP where the beam failure is detected is located is indicated to be in the Truncated BFR MAC CE, and the result of the logical channel priority processing LCP is that "the UL-SCH resource cannot accommodate the 4-byte bitmap Truncated BFR MAC CE plus its subheader."

[0156] When at least one of the second receiving unit, the third receiving unit, the first detecting unit, and the second detecting unit completes its operation, the first transmitting unit transmits a first message including a first beam failure recovery MAC CE or a second beam failure recovery MAC CE.

[0157] In some embodiments, the first indication information is used to indicate that there are few resources to accommodate the first message, or to indicate that the first message carries minimal data, or to indicate that the first message includes a first / second beam failure recovery MAC CE.

[0158] In some embodiments, the first indication information is included in a Random Access Response (RAR), or an UL grant for the RAR, or a DCI scheduling the RAR.

[0159] Although the above-described embodiments are illustrative of the present invention, the present invention is not limited thereto, and appropriate modifications may be made based on the above-described embodiments. For example, each of the above-described embodiments may be used alone, or a plurality of the above-described embodiments may be used in combination.

[0160] Although the components or modules related to the present invention have been described above, the present invention is not limited to these. The beam failure recovery information transmission device 2100 may further include other components or modules, and the specific contents of these components or modules can be found in the related art.

[0161] 21 only shows the connection relationships or signal directions between each component or module, but as will be understood by those skilled in the art, various related technologies such as bus connection may be adopted. Each of the above-described components or modules may be realized by hardware such as a processor, memory, transmitter, or receiver, but the implementation of the present invention is not limited thereto.

[0162] As can be seen from the above embodiment, when beam failures are detected in both TRPs, a fixed-size BFR MAC CE containing beam failure recovery information for the two TRPs that need recovery is transmitted in the random access procedure, or a BFR MAC CE containing beam failure recovery information for one TRP that needs recovery is transmitted. This allows Msg3 / MSGA in the random access procedure to transmit beam failure recovery information for one or two TRPs with sufficiently low overhead, and the network device can know the beam failure recovery information for the two TRPs and perform beam recovery.

[0163] <Example of the sixth aspect> An embodiment of the present invention provides a beam failure recovery device, which may be, for example, a terminal device or one or more parts or components disposed in the terminal device, and the description here is omitted for the same content as the embodiment of the fourth aspect.

[0164] 22 is a diagram illustrating a beam failure recovery device in an embodiment of the present invention. As shown in FIG. 22, a beam failure recovery device 2200 includes:

[0165] Processing unit 2201: suspends or causes the beam failure recovery (BFR) to be suspended when the BFR is triggered.

[0166] In some embodiments, the implementation of the processing unit 2201 can refer to 2001 in the embodiments of the fourth aspect, and a detailed description thereof will be omitted here.

[0167] In some embodiments, when a beam failure is detected, the processing unit 2201 triggers a beam failure recovery.

[0168] In some embodiments, the BFR remains suspended until it is canceled or successfully completed.

[0169] In some embodiments, the successful completion of the BFR includes the successful completion of the BFR when a PDCCH is received indicating an uplink grant for a new transmission of an HARQ process addressed to a C-RNTI, where the HARQ process is for transmitting an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the Enhanced BFR MAC CE or the Truncated Enhanced BFR MAC CE includes the BFR information.

[0170] In some embodiments, the BFR is cell-specific or TRP-specific.

[0171] In some embodiments, when the BFR is dedicated to a TRP, the successful completion of the TRP-dedicated BFR includes the successful completion of the TRP-dedicated BFR when a PDCCH is received indicating an uplink grant for a new transmission of an HARQ process addressed to a C-RNTI, where the HARQ process is for transmitting an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the Enhanced BFR MAC CE or the Truncated Enhanced BFR MAC CE includes BFR information dedicated to the TRP.

[0172] In some embodiments, when a failure is detected in two TRP beams of a secondary cell, the processing unit suspends BFRs of the two TRPs or causes the BFRs of the two TRPs to be suspended.

[0173] In some embodiments, when a MAC PDU is transmitted and the PDU includes an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a special cell, all triggered BFRs of the BFD-RS set of the special cell are canceled by the processing unit.

[0174] In some embodiments, when a MAC PDU is transmitted and the PDU includes an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a serving cell, all triggered BFRs of the BFD-RS set of the serving cell are canceled by the processing unit.

[0175] In some embodiments, when a MAC PDU is transmitted and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE including beam failure information of a secondary cell, all triggered BFRs of all BFD-RS sets of the secondary cell are canceled by the processing unit.

[0176] In some embodiments, when a MAC PDU is transmitted and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a secondary cell, all triggered BFRs of the BFD-RS set of the secondary cell are canceled by the processing unit.

[0177] In some embodiments, when a MAC PDU is transmitted and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a special cell, all triggered BFRs of the BFD-RS set of the special cell are canceled by the processing unit.

[0178] In some embodiments, when a MAC PDU is transmitted and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a serving cell, all triggered BFRs of the BFD-RS set of the serving cell are canceled by the processing unit.

[0179] Although the above-described embodiments are illustrative of the present invention, the present invention is not limited thereto, and appropriate modifications may be made based on the above-described embodiments. For example, each of the above-described embodiments may be used alone, or a plurality of the above-described embodiments may be used in combination.

[0180] Although the components or modules related to the present invention have been described above, the present invention is not limited thereto. The beam failure recovery device 2200 may further include other components or modules, and the specific contents of these components or modules can be found in the related art.

[0181] 22 shows only the connection relationships or signal directions between each component or module for convenience, but as will be understood by those skilled in the art, various related technologies such as bus connection may be adopted. Each of the above-described components or modules may be realized by hardware such as a processor, memory, transmitter, or receiver, but the implementation of the present invention is not limited thereto.

[0182] The fifth and sixth aspects may be implemented alone or in combination, and the present invention is not limited to these examples.

[0183] <Example of the seventh aspect> An embodiment of the present invention provides a beam failure recovery information receiving device, which may be, for example, a network device or one or more parts or components disposed in the network device, and the description of the same content as in the embodiment of the third aspect will be omitted here.

[0184] 23 is a diagram showing a beam failure recovery information receiving device in an embodiment of the present invention. As shown in FIG. 23, a beam failure recovery information receiving device 2300 includes:

[0185] A second transmitting unit 2201: transmitting candidate beam setting information to a terminal device; and Fourth receiving unit 2202: Receives a first message in the random access procedure transmitted by the terminal device, the first message including a first beam failure recovery MAC CE of fixed size, or the first message including a second beam failure recovery MAC CE, the first beam failure recovery MAC CE including beam failure recovery information of two TRPs, and the second beam failure recovery MAC CE including beam failure recovery information of the first TRP of the two TRPs.

[0186] In some embodiments, the implementation manner of the second transmitting unit 2201 and the fourth receiving unit 2202 can refer to 1901-1902 in the embodiments of the third aspect, and detailed descriptions thereof will be omitted here. The implementation manner of the first beam failure recovery MAC CE and the second beam failure recovery MAC CE can refer to the embodiments of the first or second aspect, and detailed descriptions thereof will be omitted here.

[0187] Although the above-described embodiments are illustrative of the present invention, the present invention is not limited thereto, and appropriate modifications may be made based on the above-described embodiments. For example, each of the above-described embodiments may be used alone, or a plurality of the above-described embodiments may be used in combination.

[0188] Although the components or modules related to the present invention have been described above, the present invention is not limited to these. The beam failure recovery information receiving device 2300 may further include other components or modules, and the specific contents of these components or modules can be found in the related art.

[0189] 23 shows only the connection relationships or signal directions between each component or module for convenience, but as will be understood by those skilled in the art, various related technologies such as bus connection may be adopted. Each of the above-described components or modules may be realized by hardware such as a processor, memory, transmitter, receiver, etc., but the implementation of the present invention is not limited thereto.

[0190] As can be seen from the above embodiment, when beam failures are detected in both TRPs, a fixed-size BFR MAC CE containing beam failure recovery information for the two TRPs that need recovery is transmitted in the random access procedure, or a BFR MAC CE containing beam failure recovery information for one TRP that needs recovery is transmitted. This allows Msg3 / MSGA in the random access procedure to transmit beam failure recovery information for one or two TRPs with sufficiently low overhead, and the network device can know the beam failure recovery information for the two TRPs and perform beam recovery.

[0191] <Example of the eighth aspect> An embodiment of the present invention further provides a communication system, which can be seen from FIG. 1, and the same content as that of the first to seventh embodiments will not be described here.

[0192] In some embodiments, the communication system may include a terminal device 2500 .

[0193] In some embodiments, the communication system may include a network device 2400 .

[0194] In the embodiment of the present invention, a network device is further provided, which may be, for example, a base station, but the present invention is not limited thereto and may be other network devices.

[0195] Figure 24 is a diagram showing the configuration of a network device in an embodiment of the present invention. As shown in Figure 24, the network device 2400 may include a processor 2410 (e.g., a central processing unit (CPU)) and a memory 2420. The memory 2420 is connected to the processor 2410. The memory 2420 can store various data and can further store a program 2430 for information processing, and can execute the program 2430 under the control of the processor 2410.

[0196] For example, the processor 2410 may be configured to execute a program to implement the beam failure recovery information receiving method described in the embodiment of the third aspect.

[0197] 24, the network device 2400 may further include a transceiver 2440, an antenna 2450, etc. The functions of these components are similar to those of the prior art, and detailed descriptions thereof will be omitted here. The network device 2400 does not need to include all the components shown in FIG. 24. The network device 2400 may further include components not shown in FIG. 24, and reference can be made to the prior art for such components.

[0198] Although a terminal device is further provided in the embodiment of the present invention, the present invention is not limited thereto and may be other devices.

[0199] 25 is a diagram illustrating a terminal device according to an embodiment of the present invention. As shown in FIG. 25, the terminal device 2500 may include a processor 2510 and a memory 2520, where the memory 2520 stores data and programs and is connected to the processor 2510. Note that this diagram is merely an example, and other types of components may be used to supplement or replace the components to achieve telecommunications or other functions.

[0200] For example, the processor 2510 may be configured to execute a program to implement the beam failure recovery information transmission method or the beam failure recovery method described in the embodiments of the first, second or fourth aspect.

[0201] As shown in Fig. 25, the terminal device 2500 may further include a communication module 2530, an input unit 2540, a display 2550, a power supply 2560, etc. The functions of these components are similar to those of the prior art, and detailed descriptions thereof will be omitted here. Note that the terminal device 2500 does not need to include all of the components shown in Fig. 25. Furthermore, the terminal device 2500 may further include components not shown in Fig. 25, and reference can be made to the prior art for such components.

[0202] In a further embodiment of the present invention, a computer program is provided, wherein, when the program is executed in a terminal device, the program causes the terminal device to perform the beam failure recovery information transmission method described in the embodiments of the first and second aspects.

[0203] An embodiment of the present invention further provides a storage medium storing a computer program, wherein the computer program causes a terminal device to execute the beam failure recovery information transmission method described in the embodiments of the first and second aspects.

[0204] An embodiment of the present invention further provides a computer program, which, when executed by a terminal device, causes the terminal device to perform the beam failure recovery method described in the embodiment of the fourth aspect.

[0205] An embodiment of the present invention further provides a storage medium storing a computer program, wherein the computer program causes a terminal device to perform the beam failure recovery method described in the embodiment of the fourth aspect.

[0206] Furthermore, the above-mentioned devices and methods may be realized by software or hardware, or by a combination of hardware and software. The present invention also relates to a computer-readable program as described below, which, when executed by a logic component, causes the logic component to realize the above-mentioned devices or components, or to perform each of the above-mentioned methods or steps. The logic component may be, for example, an FPGA (Field Programmable Gate Array), a microprocessor, or a processing unit used in a computer. The present invention also relates to a storage medium, such as a hard disk, magnetic disk, optical hard disk, DVD, or flash memory, that stores the above-mentioned program.

[0207] Furthermore, one or more combinations of the functional blocks illustrated in the figures and / or one or more combinations of the functional blocks may be implemented as a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic component, a discrete gate or transistor logic component, a discrete hardware assembly, or any other suitable combination for performing the functions described herein. Also, one or more combinations of the functional blocks illustrated in the figures and / or one or more combinations of the functional blocks may be further implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors communicatively coupled with a DSP, or any other configuration.

[0208] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and any modifications to the present invention that do not depart from the spirit of the present invention fall within the technical scope of the present invention.

[0209] Furthermore, the following additional notes are disclosed regarding the above-described embodiments.

[0210] (Appendix 1) A beam failure recovery information transmission method, applied to a terminal device side, the method comprising: The terminal device detects beam failures at both transmit / receive points (TRPs) of the special cell; and The terminal device transmits a first message in a random access procedure to a network device; A method wherein the first message includes a first beam failure recovery medium access control (MAC) control unit (CE) of fixed size, or the first message includes a second beam failure recovery MAC CE, the first beam failure recovery MAC CE including beam failure recovery information of the two TRPs, and the second beam failure recovery MAC CE including beam failure recovery information of the first TRP of the two TRPs.

[0211] (Appendix 2) 2. The method of claim 1, comprising: The method, wherein the first message includes MSG3 or MSGA.

[0212] (Appendix 3) 10. The method according to claim 1 or 2, A method in which a first MAC subheader corresponding to the first beam failure recovery MAC CE includes at least a first logical channel identifier LCID, and the first LCID is for indicating a fixed-size first beam failure recovery MAC CE.

[0213] (Appendix 4) 4. The method of claim 3, The method, wherein the value of the first LCID is a reserved value of the LCID of the uplink shared channel (UL-SCH).

[0214] (Appendix 5) 5. The method of claim 4, The method of claim 1, wherein the value of the first LCID is one of 35, 36, 43, and 44.

[0215] (Appendix 6) 10. The method according to claim 1 or 2, A method in which a first MAC subheader corresponding to the first beam failure recovery MAC CE includes at least a first LCID and a first extended logical channel indicator eLCID, the first LCID being for indicating an extended LCID field, and the first eLCID being for indicating a first beam failure recovery MAC CE of fixed size.

[0216] (Appendix 7) 7. The method of claim 6, The method, wherein the first eLCID value is an eLCID reserved value for UL-SCH.

[0217] (Appendix 8) 8. The method of claim 7, The method, wherein the value of the first eLCID is one of 0 to 249.

[0218] (Appendix 9) 7. The method of any one of claims 3 to 6, comprising: The first MAC subheader does not include length indication bit information.

[0219] (Appendix 10) 10. The method of any one of claims 1 to 9, comprising: A method in which the first beam failure recovery MAC CE includes at least an AC area, a candidate reference signal ID area, or a reserved bit area.

[0220] (Appendix 11) 11. The method of claim 10, The method, wherein the first beam failure recovery MAC CE further includes a TRP information field.

[0221] (Appendix 12) 12. The method according to claim 10 or 11, The method, wherein the first beam failure recovery MAC CE further comprises a Ci / SP field.

[0222] (Appendix 13) 13. The method of any one of claims 10 to 12, comprising: A method in which the AC field is for indicating whether a candidate beam of one failed TRP of the special cell is available, the candidate reference signal ID field is for indicating one candidate beam of the failed TRP, and the TRP information field is for indicating a failed TRP of the two TRPs or for indicating whether a beam failure is detected in a TRP of the two TRPs.

[0223] (Appendix 14) 14. The method of claim 13, If the TRP information field is for indicating a failed TRP of the two TRPs, the value of the TRP information field is an index of the TRP in which a beam failure is detected, or an index of a beam failure detection reference signal (BFD-RS) set associated with the index of the TRP in which a beam failure is detected, or an index of an associated control resource set pool (coreset pool); or A method in which, when the TRP information field is for indicating whether a beam failure has been detected at a TRP of the two TRPs, a first value of the TRP information field indicates that a beam failure has not been detected at the TRP, and a second value of the TRP information field indicates that a beam failure has been detected at the TRP.

[0224] (Appendix 15) 14. The method of claim 13, The method, wherein the candidate reference signal ID field is an index of a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS).

[0225] (Appendix 16) 10. The method according to claim 1 or 2, A method in which the terminal device initiates the random access procedure in a random access resource of a second TRP of the two TRPs.

[0226] (Appendix 17) 17. The method of claim 16, further comprising: The terminal device transmits a random access preamble in a random access channel opportunity (RO) corresponding to a first downlink reference signal; The first downlink reference signal corresponds to the second TRP.

[0227] (Appendix 18) 17. The method of claim 16, further comprising: The terminal device receives candidate beam setting information transmitted by the network device, A method in which the configuration information includes TRP-related information, and the TRP-related information is an index of a failed TRP, or an index of a BFD-RS set in which a beam failure is detected, or an index of a coreset pool associated with a BFD-RS set in which a beam failure is detected; or an index of a TRP in which a candidate beam or random access resource is located, or an index of a BFD-RS set corresponding to the TRP, or an index of a coreset pool associated with the BFD-RS set.

[0228] (Appendix 19) 19. The method of any one of claims 16 to 18, comprising: A method in which the second beam failure recovery MAC CE includes at least an AC area, a candidate reference signal ID area, or a reserved bit area.

[0229] (Appendix 20) 19. The method of claim 18, The method, wherein the second beam failure recovery MAC CE further includes a TRP information field.

[0230] (Appendix 21) 21. The method of claim 20, A method in which the TRP information field is for indicating the failed first TRP, or for indicating a BFD-RS set or coreset pool in which a beam failure has been detected in a special cell, the BFD-RS set or the coreset pool corresponding to the first TRP, the AC field is for indicating whether a candidate reference signal ID field exists, or for indicating whether a candidate beam of one failed TRP of the special cell is available, and the candidate reference signal ID field is for indicating one candidate beam of the failed TRP.

[0231] (Appendix 22) 22. The method of claim 21, The method, wherein the candidate reference signal ID field is an index of an SSB or a CSI-RS.

[0232] (Appendix 23) 21. The method according to claim 19 or 20, The method, wherein the second beam failure recovery MAC CE further comprises a Ci / SP region.

[0233] (Appendix 24) 24. The method of any one of claims 16 to 23, comprising: A method wherein a second MAC subheader corresponding to the second beam failure recovery MAC CE includes at least a second LCID, and the second LCID is for indicating a single bitmap beam failure recovery MAC CE or a single bitmap truncated beam failure recovery MAC CE or an enhanced beam failure recovery MAC CE.

[0234] (Appendix 25) 24. The method of any one of claims 16 to 23, comprising: A method in which a second MAC subheader corresponding to the second beam failure recovery MAC CE includes at least a second LCID and a second eLCID, the second LCID being for indicating an enhanced LCID field and the second eLCID being for indicating a beam failure recovery MAC CE.

[0235] (Appendix 26) 26. The method according to claim 24 or 25, The second MAC subheader includes length indication bit information.

[0236] (Appendix 27) 27. The method of any one of claims 1 to 26, comprising: The method further comprises at least one of the following: Detecting that the uplink grant or configured uplink resources indicated by the RAR received by the terminal device are insufficient to carry an enhanced beam failure recovery MAC CE including beam failure recovery information of two failed TRPs; The terminal device receives first instruction information for transmission from the network device; The terminal device detects that the highest serving cell index ServCellIndex of the secondary cell in which the TRP in which the beam failure is detected is located / associated is less than 8; A method in which the special cell in which the beam-failed TRP is located is indicated to be in a truncated BFR MAC CE, and the logical channel priority processing LCP result detects that "the UL-SCH resource cannot accommodate the 4-byte bitmap truncated BFR MAC CE plus its subheader."

[0237] (Appendix 28) 28. The method of claim 27, A method in which the first indication information is used to indicate that there are few resources to accommodate the first message, or that the first message carries minimal data, or that the first message includes a first / second beam failure recovery MAC CE.

[0238] (Appendix 29) 28. The method of claim 27, The method, wherein the first indication information is included in a random access response (RAR), or an UL grant of the RAR, or a DCI scheduling the RAR.

[0239] (Appendix 30) A beam failure recovery information receiving method, applied to a network device side, the method comprising: The network device sends candidate beam setting information to the terminal device; and The network device receives a first message in a random access procedure transmitted by the terminal device; A method in which the first message includes a first beam failure recovery MAC CE of fixed size, or the first message includes a second beam failure recovery MAC CE, the first beam failure recovery MAC CE including beam failure recovery information for two TRPs, and the second beam failure recovery MAC CE including beam failure recovery information for the first TRP of the two TRPs.

[0240] (Appendix 31) 1. A beam failure recovery method comprising: A method in which, when a beam failure recovery (BFR) is triggered, the terminal device suspends the BFR or the BFR is suspended.

[0241] (Appendix 32) 32. The method of claim 31, Triggering the beam failure recovery (BFR) when a beam failure is detected.

[0242] (Appendix 33) 32. The method of claim 31, The BFR is suspended until it is canceled or successfully completed.

[0243] (Appendix 34) 34. The method of claim 33, The successful completion of the BFR will: The BFR is successfully completed when a PDCCH indicating a new transmission uplink grant for a HARQ process addressed to a C-RNTI is received; wherein the HARQ process is for transmitting an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the Enhanced BFR MAC CE or the Truncated Enhanced BFR MAC CE includes the BFR information.

[0244] (Appendix 35) 33. The method of any one of claims 31 to 32, comprising: The method, wherein the BFR is cell-specific or TRP-specific.

[0245] (Appendix 36) 36. The method of claim 35, The BFR is dedicated to the TRP, and successful completion of the BFR dedicated to the TRP is When receiving one PDCCH indicating an uplink grant for a new transmission of a HARQ process addressed to a C-RNTI, the TRP-specific BFR is successfully completed; wherein the HARQ process is for transmitting an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the Enhanced BFR MAC CE or the Truncated Enhanced BFR MAC CE includes BFR information dedicated to the TRP.

[0246] (Appendix 37) 33. The method of claim 32, When two TRP beam failures of a secondary cell are detected, the BFRs of the two TRPs are suspended.

[0247] (Appendix 38) 36. The method of claim 35, When a MAC PDU is transmitted, and the PDU includes an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a special cell, all triggered BFRs of the BFD-RS set of the special cell are canceled.

[0248] (Appendix 39) 36. The method of claim 35, When a MAC PDU is transmitted, and the PDU includes an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a serving cell, all triggered BFRs of the BFD-RS set of the serving cell are canceled.

[0249] (Appendix 40) 36. The method of claim 35, A method in which, when a MAC PDU is transmitted and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE including beam failure information of a secondary cell, all triggered BFRs in all BFD-RS sets of the secondary cell are canceled.

[0250] (Appendix 41) 36. The method of claim 35, When a MAC PDU is transmitted, and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a secondary cell, all triggered BFRs of the BFD-RS set of the secondary cell are canceled.

[0251] (Appendix 42) 36. The method of claim 35, A method in which, when a MAC PDU is transmitted and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a special cell, all triggered BFRs of the BFD-RS set of the special cell are canceled.

[0252] (Appendix 43) 36. The method of claim 35, When a MAC PDU is transmitted, and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a serving cell, all triggered BFRs of the BFD-RS set of the serving cell are canceled.

[0253] (Appendix 44) A network device, a memory and a processor; A network device, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the beam failure recovery information receiving method described in Appendix 30.

[0254] (Appendix 45) A terminal device, a memory and a processor; A terminal device, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the method according to any one of appendices 1 to 29 and 31 to 43.

[0255] (Appendix 46) A beam failure recovery device applied to a terminal device, the device comprising: An apparatus comprising: a processing unit configured to suspend a beam failure recovery (BFR) or cause the BFR to be suspended when the BFR is triggered.

[0256] (Appendix 47) 47. The apparatus of claim 46, further comprising: When a beam failure is detected, the processing unit triggers the beam failure recovery (BFR).

[0257] (Appendix 48) 47. The apparatus of claim 46, further comprising: The BFR is suspended until it is canceled or successfully completed.

[0258] (Appendix 49) 47. The apparatus of claim 46, further comprising: The successful completion of the BFR will: The BFR is successfully completed when a PDCCH indicating a new transmission uplink grant for a HARQ process addressed to a C-RNTI is received; wherein the HARQ process is for transmitting an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the Enhanced BFR MAC CE or the Truncated Enhanced BFR MAC CE includes the BFR information.

[0259] (Appendix 50) 49. The apparatus of any one of clauses 46 to 48, comprising: The device, wherein the BFR is cell-specific or TRP-specific.

[0260] (Appendix 51) 49. The apparatus of claim 48, The BFR is dedicated to the TRP, and successful completion of the BFR dedicated to the TRP is When receiving one PDCCH indicating an uplink grant for a new transmission of a HARQ process addressed to a C-RNTI, the TRP-specific BFR is successfully completed; Wherein, the HARQ process is transmission of an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the Enhanced BFR MAC CE or the Truncated Enhanced BFR MAC CE includes BFR information dedicated to the TRP.

[0261] (Appendix 52) 48. The apparatus of claim 47, When beam failure is detected in two TRPs of a secondary cell, the processing unit suspends BFRs of the two TRPs or causes the BFRs of the two TRPs to be suspended.

[0262] (Appendix 53) 49. The apparatus of claim 48, When a MAC PDU is transmitted and the PDU includes an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a special cell, all triggered BFRs of the BFD-RS set of the special cell are canceled by the processing unit.

[0263] (Appendix 54) 49. The apparatus of claim 48, When a MAC PDU is transmitted and the PDU includes an Enhanced BFR MAC CE or a Truncated Enhanced BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a serving cell, all triggered BFRs of the BFD-RS set of the serving cell are canceled by the processing unit.

[0264] (Appendix 55) 49. The apparatus of claim 48, When a MAC PDU is transmitted and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE including beam failure information of a secondary cell, all triggered BFRs of all BFD-RS sets of the secondary cell are canceled by the processing unit, the device.

[0265] (Appendix 56) 49. The apparatus of claim 48, When a MAC PDU is transmitted and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a secondary cell, all triggered BFRs of the BFD-RS set of the secondary cell are canceled by the processing unit.

[0266] (Appendix 57) 49. The apparatus of claim 48, When a MAC PDU is transmitted and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a special cell, all triggered BFRs of the BFD-RS set of the special cell are canceled by the processing unit, the device.

[0267] (Appendix 58) 49. The apparatus of claim 48, When a MAC PDU is transmitted and the PDU includes a BFR MAC CE or a Truncated BFR MAC CE, and the BFR MAC CE includes beam failure recovery information of a BFD-RS set of a serving cell, all triggered BFRs of the BFD-RS set of the serving cell are canceled by the processing unit.

[0268] (Appendix 59) 1. A communication system comprising: A communication system including a terminal device according to Supplementary Note 45 and / or a network device according to Supplementary Note 44.

Claims

1. An apparatus for transmitting beam failure recovery information, which can be applied to a terminal device, comprising: a processor for detecting beam failure in two beam failure detection reference signal (BFD-RS) sets of the first cell; and a transmitter for transmitting a first message in a random access procedure to a network device; the first message includes a truncated beam failure recovery medium access control (MAC) control unit (CE), the truncated beam failure recovery MAC CE including beam failure recovery information of a failed BFD-RS set; The processor further comprises: Detecting that the highest serving cell index (ServCellIndex) of a secondary cell associated with the beam-failed BFD-RS set is less than 8; and Detect that the first cell associated with the beam-failed BFD-RS set is indicated to be in a Truncated BFR MAC CE, and that the UL-SCH resources cannot accommodate the Truncated BFR MAC CE plus its subheader in the 4-byte bitmap, as a result of logical channel priority processing. The apparatus is configured to:

2. 10. The apparatus of claim 1, The first message includes MSG3 or MSGA.

3. 10. The apparatus of claim 1, further comprising a receiver; The receiver receives candidate beam setting information from the network device; An apparatus, wherein the candidate beam setting information includes indices of the two BFD-RS sets.

4. 10. The apparatus of claim 1, An apparatus, wherein the truncated beam failure recovery MAC CE includes at least an AC field, an SP field, and a candidate reference signal ID field or a reserved bit.

5. 5. The apparatus of claim 4, The truncated beam failure recovery MAC CE further includes a BFD-RS set information field.

6. 6. The apparatus of claim 5, The BFD-RS set information field is used to indicate the index of the failed BFD-RS set; The AC field is used to indicate whether a candidate reference signal ID field exists or whether a candidate beam of a failed BFD-RS set of the first cell is available; The apparatus, wherein the candidate reference signal ID field is used to indicate an index of an SSB or CSI-RS in the failed BFD-RS set.

7. 7. The apparatus of claim 6, The apparatus, wherein the candidate reference signal ID field is present when the AC field is set to 1, and the reserved bit is present in place of the candidate reference signal ID field when the AC field is set to 0.

8. 7. The apparatus of claim 6, The apparatus, when the SP field is set to 1, indicates that a beam failure has been detected in at least one BFD-RS set of the first cell.

9. 6. The apparatus of claim 5, A device, wherein the size of the BFD-RS set information area is 1 bit.

10. 10. The apparatus of claim 1, the MAC subheader corresponding to the truncated beam failure recovery MAC CE includes at least an LCID; The apparatus, wherein the LCID is used to indicate a single bitmap truncated beam failure recovery MAC CE.

11. 11. The apparatus of claim 10, The device, wherein the value of the LCID is any one of 35 to 44.

12. An apparatus for receiving beam failure recovery information, which may be applied to a network device, comprising: A transmitter that transmits candidate beam setting information to a terminal device; and a receiver for receiving a first message in a random access procedure transmitted by the terminal device; the first message includes a truncated beam failure recovery MAC CE, the truncated beam failure recovery MAC CE including beam failure recovery information of a failed BFD-RS set; The highest serving cell index (ServCellIndex) of the secondary cell associated with the beam-failed BFD-RS set is less than 8; and The apparatus, wherein the first cell associated with a beam-failed BFD-RS set is indicated to be in a Truncated BFR MAC CE, and logical channel priority processing results in the UL-SCH resource being unable to accommodate the Truncated BFR MAC CE plus its subheader of a 4-byte bitmap.

13. 13. The apparatus of claim 12, An apparatus, wherein the candidate beam setting information includes indices of two BFD-RS sets.

14. 13. The apparatus of claim 12, The apparatus, wherein the truncated beam failure recovery MAC CE includes at least an AC field, an SP field, and a candidate reference signal ID field or reserved bits.

15. 15. The apparatus of claim 14, The truncated beam failure recovery MAC CE further includes a BFD-RS set information field.

16. 16. The apparatus of claim 15, The BFD-RS set information field is used to indicate the index of the failed BFD-RS set; The AC field is used to indicate whether a candidate reference signal ID field exists or whether a candidate beam of a failed BFD-RS set of a first cell is available; The apparatus, wherein the candidate reference signal ID field is used to indicate an index of an SSB or CSI-RS in the failed BFD-RS set.

17. A communication system including a terminal device and a network device, The terminal device Detecting beam failures in two beam failure detection reference signal (BFD-RS) sets of the first cell; and Send a first message in a random access procedure to the network device It is configured as follows: the first message includes a truncated beam failure recovery medium access control (MAC) control unit (CE), the truncated beam failure recovery MAC CE including beam failure recovery information of a failed BFD-RS set; the network device is configured to receive the first message; The terminal device further Detecting that the highest serving cell index (ServCellIndex) of a secondary cell associated with the beam-failed BFD-RS set is less than 8; and Detect that the first cell associated with the beam-failed BFD-RS set is indicated to be in a Truncated BFR MAC CE, and that the UL-SCH resources cannot accommodate the Truncated BFR MAC CE plus its subheader in the 4-byte bitmap, as a result of logical channel priority processing. A communication system configured as follows.

Images