Method and apparatus for reporting beam failure information

Abstract

An embodiment of the present invention provides a method and device for reporting beam failure information, which includes a step of a terminal device determining that candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) has been completed in a secondary cell in which a beam failure has occurred, and a step of reporting to a network device that a beam failure has occurred in the secondary cell.

Description

[Technical Field]

[0001] FIELD OF THE INVENTION Embodiments of the present invention relate to the field of communications technology. [Background technology]

[0002] The New Radio (NR) system supports beam transmission and reception and supports the management of multiple beams. A terminal device can perform beam failure detection procedures and beam failure recovery procedures. In the beam failure detection procedure, a MAC entity in the media access control (MAC) layer of the terminal device detects beam failure by calculating the number indicated by the beam failure instance provided to the MAC entity by a lower layer (e.g., physical layer).

[0003] For example, the beam failure detection procedure uses the UE variable BFI_COUNTER, which is a counter indicated by the beam failure instance and is initially set to 0, with one BFI_COUNTER for each serving cell. For each serving cell for which beam failure detection is configured, the MAC entity performs the following processing:

[0004] When a beam failure instance indication is received from a lower layer, the beam failure detection timer (beamFailureDetectionTimer) is started or restarted. The terminal device also increments the BFI_COUNTER variable by 1. If BFI_COUNTER is equal to or greater than the beam failure instance maximum count value (beamFailureInstanceMaxCount), it triggers a beam failure recovery (BFR) for one of the serving cells if the serving cell is a secondary cell; otherwise, it initiates a random access process in a special cell. If the beamFailureDetectionTimer times out, or if a higher layer has reconfigured the beamFailureDetectionTimer, beamFailureInstanceMaxCount, or reference signal for beam failure detection for this serving cell, it sets BFI_COUNTER to 0.

[0005] For each serving cell, Radio Resource Control (RRC) can be used to configure a beam failure recovery procedure for the MAC entity, which indicates a new SSB or CSI-RS to the serving network device (e.g., gNB) when a beam failure is detected in the service synchronization signal block (SSB) / channel state information reference signal (CSI-RS).

[0006] When a MAC Protocol Data Unit (PDU) is transmitted 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 information of a secondary cell, the terminal device must cancel all BFRs triggered by the secondary cell for beam failure recovery before the MAC PDU is assembled.

[0007] In the beam failure recovery procedure, the MAC entity performs the following operations:

[0008] If the beam failure recovery procedure determines that at least one BFR has been triggered and the BFR has not been cancelled, instructing a multiplexing and assembly procedure to generate a BFR MAC CE when uplink resources (UL-SCH resources) are available for a new transmission and the uplink resources can accommodate a BFR MAC CE and its subheader as a result of a Logical Channel Prioritization process (LCP); If uplink resources are available for new transmission and the uplink resources can accommodate the Truncated BFR MAC CE and its subheader as a result of the LCP, instruct a multiplexing and assembly procedure to generate the Truncated BFR MAC CE; Otherwise, trigger a Scheduling Request (SR) for each secondary cell for which a BFR has been triggered and for which the BFR has not been cancelled.

[0009] Therefore, the beam failure information of the secondary cell can be carried by the BFR MAC CE or the truncated BFR MAC CE (hereinafter abbreviated as (Truncated) BFR MAC CE) and transmitted by the terminal device to the network device.

[0010] The above description of the background art is merely for the purpose of explaining the configuration of the present invention more clearly and completely, and is provided for the understanding of those skilled in the art. These configurations described in the background art of the present invention should not be construed as being well known to those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0011] However, as discovered by the inventors of the present invention, a terminal device can generate a (truncated) BFR MAC CE before candidate beam detection is complete, but the MAC CE may not include candidate beam information, such as candidate reference signal (RS) identifiers (IDs). If a network device receives a MAC CE without candidate beam information, it only knows that a beam failure has occurred in the terminal device's secondary cell, but does not have appropriate candidate beam information. In this case, the network device may configure an inappropriate beam for the terminal device, and as a result, it may not be able to recover from the beam failure.

[0012] In view of at least one of the above problems, embodiments of the present invention provide a method and apparatus for reporting beam failure information. [Means for solving the problem]

[0013] In one aspect of an embodiment of the present invention, a method for reporting beam failure information is provided, comprising the steps of a terminal device determining that candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed in a secondary cell in which a beam failure has occurred, and reporting to a network device that a beam failure has occurred in the secondary cell.

[0014] Another aspect of an embodiment of the present invention provides a beam failure information reporting device, the device including: a detection unit that detects a candidate beam; and a reporting unit that reports beam failure in a secondary cell for which candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed.

[0015] Another aspect of an embodiment of the present invention provides a method for reporting beam failure information, the method including a step in which a terminal device determines that candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed in a secondary cell in which a beam failure has occurred, and a step in which a medium access control protocol data unit including beam failure information of the secondary cell is reported to a network device.

[0016] Another aspect of an embodiment of the present invention provides a beam failure information reporting device, comprising: a detection unit that detects a candidate beam; and a reporting unit that reports to a network device a medium access control protocol data unit that includes beam failure information in a secondary cell for which candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed.

[0017] Another aspect of an embodiment of the present invention provides a method for reporting beam failure information, the method including: a step in which a terminal device detects that a beam failure has occurred in a secondary cell; and a step in which the terminal device does not report that a beam failure has occurred in the secondary cell before candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within an evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal in the secondary cell, and / or does not instruct a multiplexing and assembly procedure to generate a beam failure recovery medium access control control element or a shortened beam failure recovery medium access control control element.

[0018] Another aspect of an embodiment of the present invention provides a beam failure information reporting device, comprising: a detection unit that detects that beam failure has occurred in a secondary cell; and a processing unit that does not report that beam failure has occurred in the secondary cell before candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within an evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal in the secondary cell, and / or does not instruct a multiplexing and assembly procedure to generate a beam failure recovery medium access control control element or a shortened beam failure recovery medium access control control element.

[0019] One of the advantageous effects of the embodiment of the present invention is as follows: When a terminal device completes candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) in a secondary cell in which a beam failure has occurred, the terminal device reports to a network device that a beam failure has occurred in the secondary cell, or reports to the network device a medium access control (MAC) protocol data unit (PDU) including beam failure information of the secondary cell. This prevents the network device from configuring an inappropriate beam for the terminal device, thereby reducing or avoiding the inability to recover from the beam failure.

[0020] As shown in the following description and drawings, specific embodiments of the present invention are disclosed in detail to illustrate ways in which the principles of the present invention can be employed. However, the scope of the present invention is not limited to these embodiments. The present invention encompasses all modifications, alterations, and equivalents within the spirit and scope of the appended claims.

[0021] Features described and / or shown in one embodiment may be used in the same or similar manner in one or more other embodiments, may be combined with features in other embodiments, or may be substituted for features in other embodiments.

[0022] It should be noted that in this text, the term "comprise / have" means that a feature, element, step or component is present, but does not exclude the presence or addition of one or more other features, elements, steps or components. [Brief explanation of the drawings]

[0023] Elements and features depicted in one drawing and one embodiment of an example of the invention may be combined with elements and features shown in one or more drawings or embodiments, and in the drawings, like reference numerals may indicate corresponding elements in multiple drawings and may indicate corresponding elements used in more than one embodiment. [Figure 1] 1 is a schematic diagram of a communication system according to an embodiment of the present invention; [Figure 2] 1 is a schematic diagram of an example of a first format BFR MAC CE or a truncated BFR MAC CE. [Figure 3] 10 is a schematic diagram of an example of a second format BFR MAC CE or a truncated BFR MAC CE. [Figure 4] A schematic diagram of an example scenario of reporting beam failure information by a terminal device in an embodiment of the present invention. [Figure 5] A schematic diagram of another example scenario of reporting beam failure information by a terminal device in an embodiment of the present invention. [Figure 6] 1 is a schematic diagram of an example of a method for reporting beam failure information according to an embodiment of the present invention; [Figure 7] 10 is a schematic diagram of another example of a method for reporting beam failure information in an embodiment of the present invention. [Figure 8] 1 is a schematic diagram of an example of a beam failure information reporting device according to an embodiment of the present invention; [Figure 9] 10 is a schematic diagram of another example of a beam failure information reporting device according to an embodiment of the present invention; [Figure 10] FIG. 1 is a schematic diagram of a network device according to an embodiment of the present invention. [Figure 11] FIG. 2 is a schematic diagram of a terminal device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] The above and other features of the present invention will become apparent from the following description. In the specification and drawings, specific embodiments of the present invention are disclosed in detail, and some of the embodiments in which the principles of the present invention can be adopted are shown. However, the present invention is not limited to the described embodiments. The present invention includes all modifications, variations, and equivalents within the scope of the appended claims. Below, various embodiments of the present invention will be described with reference to the drawings. These embodiments are merely illustrative and do not limit the present invention.

[0025] In embodiments of the present invention, the terms "first," "second," etc. are used in titles to distinguish between different elements, but do not represent the spatial arrangement or temporal order of these elements, and these elements are not limited to these terms. The term "and / or" includes any and all combinations of one or more of the terms listed in the associated list. The terms "comprise," "include," "have," etc. refer to the presence of listed features, elements, elements, or components, but do not exclude the presence or addition of one or more other features, elements, elements, or components.

[0026] In the embodiments of the present invention, the singular forms "one," "the," etc., include the plural and should be understood broadly as "one kind" or "one class," and are not limited to "one." Furthermore, the term "said" should be understood to include both the singular and the plural, unless the context clearly indicates otherwise. Furthermore, the term "described in" should be understood to mean "described at least in part," and the term "based on" should be understood to mean "based at least in part," unless the context clearly indicates otherwise.

[0027] In embodiments of the present invention, the terms "communication network" or "wireless communication network" may refer to a network conforming to any communication standard, such as, for example, Long Term Evolution (LTE), Long Term Evolution Advanced (LTE-A, LTE-Advanced), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0028] Additionally, communications between devices in a communications system may occur according to any stage of communications protocol, including, but not limited to, 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, and 5G, New Radio (NR), and / or other currently known or future developed communications protocols.

[0029] In an embodiment of the present invention, the term "network device" refers to a device in a communication system that allows a terminal device to access the communication system and provides a service to the terminal device, and may include, but is not limited to, a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobility management entity (MME), a gateway, a server, a radio network controller (RNC), a base station controller (BSC), etc.

[0030] Among them, 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., as well as a remote radio head (RRH), a remote radio unit (RRU), a relay or a low-power node (e.g., femto, pico, etc.), an integrated access and backhaul (IAB) node, an IAB-DU, or an IAB-donor. The term "base station" may include some or all of these functions, and each base station may provide communication coverage for a specific geographic area. The term "cell" may refer to a base station and / or its coverage area depending on the context in which the term is used. The terms "cell" and "base station" may be interchangeable unless confusion arises.

[0031] In the embodiments of the present invention, the term "User Equipment" (UE) or "Terminal Equipment" (TE) refers to a device that accesses a communication network and receives network services via, for example, a network device. The terminal device 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), an IAB-MT, a station, etc.

[0032] Among them, the terminal device may include, but is not limited to, a mobile phone, a personal digital assistant (PDA), a wireless modulation / demodulation device, a wireless communication device, a handheld device, a machine-type communication device, a laptop computer, a cordless phone, a smartphone, a smart watch, a digital camera, etc.

[0033] For example, in a scenario such as the Internet of Things (IoT), the user equipment may 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.

[0034] Furthermore, the term "network side" or "network device side" refers to the side of a network, which may be a base station or may include one or more of the network devices described above. The term "user side" or "terminal side" or "terminal device side" refers to the side of a user or terminal, which may be a UE or may include one or more of the terminal devices described above. In this specification, unless otherwise specified, "device" may refer to either a network device or a terminal device.

[0035] The following describes an example scenario of the present invention with reference to an example, but the present invention is not limited thereto.

[0036] 1 is a schematic diagram of a communication system according to an embodiment of the present invention, and schematically illustrates examples of user equipment and network equipment. As shown in FIG. 1, a communication system 100 may include a network equipment 101 and a terminal equipment 102. For convenience of explanation, FIG. 1 illustrates an example of one terminal equipment and one network equipment, but the embodiment of the present invention is not limited thereto.

[0037] In an embodiment of the present invention, existing services or services that can be implemented in the future can be performed between the network device 101 and the terminal device 102. For example, these services include, but are not limited to, enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable and low-latency communication (URLLC).

[0038] In the beam failure recovery procedure, beam failure information of the secondary cell is carried by the BFR MAC CE or the Truncated BFR MAC CE and transmitted by the terminal device to the network device.

[0039] Figure 2 is a schematic diagram of an example of a BFR MAC CE or a truncated BFR MAC CE in a first format (referred to as format 1), and Figure 3 is a schematic diagram of an example of 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, the MAC entity uses Format 1 in Figure 2 if the highest serving cell index, ServCellIndex, of the secondary cell in which a beam failure is detected is smaller than 8, otherwise it uses Format 2 in Figure 3. For a Truncated BFR MAC CE, the MAC entity uses Format 1 in Figure 2 if the highest serving cell index, ServCellIndex, of the secondary cell in which a beam failure is detected is smaller than 8, or if a special cell has detected a beam failure and this special cell is included in the Truncated BFR MAC CE, and the LCP result is that the UL-SCH resources cannot accommodate the Truncated BFR MAC CE in Format 2 in Figure 3 and its subheader, otherwise it uses Format 2 in Figure 3.

[0041] For example, the fields for format 1 and format 2 are defined as follows:

[0042] For BFR MAC CE, the Ci field indicates the presence of one byte containing beam failure detection for the secondary cell of ServCellIndex i, and 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.

[0043] A Ci field set to 1 means that a beam failure is detected in the secondary cell with ServCellIndex i and a byte containing an AC field is present. A Ci field set to 0 means that a beam failure is not detected in the secondary cell with ServCellIndex i and a byte containing an AC field is not present. The bytes containing the AC field are present in ascending order of ServCellIndex.

[0044] For Truncated BFR MAC CE, the Ci field indicates beam failure detection for the secondary cell with ServCellIndex i, and the AC field 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] The Ci field set to 1 means that a beam failure is detected on the secondary cell with ServCellIndex i and a byte containing an AC field may be present. The Ci field set to 0 means that a beam failure is not detected on the secondary cell with ServCellIndex i and a byte containing an AC field is not present. 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.

[0046] Having generally described (Truncated) BFR MAC CE above, we now describe a scenario relevant to an embodiment of the present invention.

[0047] Figure 4 is a schematic diagram of an example scenario of reporting beam failure information by a terminal device in an embodiment of the present invention, showing a situation in which, after a BFR trigger, if it has not yet been canceled, the lower layer has not completed evaluation of the candidate beam information (RS ID), and there is already an uplink grant that can accommodate a (truncated) BFR MAC CE.

[0048] As shown in Fig. 4, for example, t0 is the time of BFR trigger, t1 is the time of generating MAC CE, t2 is the time when uplink grant (UL grant) for transmitting MAC CE arrives, and t3 is the time when lower layer completes candidate beam detection and / or candidate beam information (RS ID) is provided to the MAC entity by lower layer. Although the UL grant in Fig. 4 exemplifies dynamic scheduling, the embodiment of the present invention is not limited thereto, and the UL grant may be a configured grant (CG).

[0049] As shown in Figure 4, the MAC entity knows, for example, via DCI on the Physical Downlink Control Channel (PDCCH), that there are uplink resources available at time t2 before triggering BFR. Thus, when BFR is triggered, i.e., at time t0, the MAC entity can instruct the multiplexing and reassembly procedure to generate a (truncated) BFR MAC CE. The multiplexing and reassembly procedure can generate this MAC CE and assemble a MAC PDU containing this MAC CE at any time between t0 and t2.

[0050] Figure 5 is a schematic diagram of another example scenario of reporting beam failure information by a terminal device in an embodiment of the present invention, showing a situation in which after a BFR trigger, the lower layer has not completed evaluation of candidate beam information (RS ID) and there is already an uplink grant that can accommodate a (truncated) BFR MAC CE.

[0051] As shown in Fig. 5, for example, t0 is the time of BFR trigger, t1 is the time indicating that MAC CE is generated, t2 is the time when uplink grant (UL grant) for transmitting MAC CE arrives, and t3 is the time when lower layer completes candidate beam detection and / or provides candidate beam information (RS ID) to the MAC entity. Although the UL grant in Fig. 5 exemplifies dynamic scheduling, the embodiment of the present invention is not limited thereto, and the UL grant may be a configured grant (CG).

[0052] As shown in Figure 5, for example, at time t0 when BFR is triggered, the MAC entity knows that there are no uplink resources available to transmit the current (truncated) BFR MAC CE. According to existing procedures, if there are no available uplink resources, the MAC entity triggers an SR to request uplink resources. In practice, the MAC entity can wait to trigger an SR as long as it is guaranteed that the triggered SR will be sent to the network device within a predetermined time. While the MAC entity is waiting, the network device may provide an uplink grant, so the MAC entity does not need to trigger an SR to obtain uplink resources.

[0053] As shown in Figure 5, at time t0, the MAC entity triggers BFR, but there are no uplink resources available to transmit the (truncated) BFR MAC CE. The MAC entity waits a predetermined period and, at time t1, via the DCI on the PDCCH, learns of an available uplink grant to transmit the (truncated) BFR MAC CE and can instruct the multiplexing and encapsulation procedure to generate a MAC CE. The multiplexing and encapsulation procedure can generate a MAC CE at any time before time t2 and assemble a MAC PDU containing this MAC CE.

[0054] However, as shown in Figures 4 and 5, the time t3 at which the lower layer provides the candidate beam information (RS ID) to the MAC entity is later than the time t1 at which the MAC entity knows that an uplink grant capable of accommodating the (Truncated) BFR MAC CE exists, or later than the time t2 at which the uplink grant arrives, in which case the generated MAC CE does not include the candidate beam information (RS ID).

[0055] If the network device receives a MAC CE without candidate beam information, it only knows that a beam failure has occurred in the secondary cell of the terminal device, but has not received the candidate beam information transmitted by the terminal device. In this case, the network device may configure an inappropriate beam for the terminal device, and as a result, may not be able to recover from the beam failure.

[0056] The above further describes an embodiment of the present invention. The embodiment of the present invention is described from the MAC layer of a terminal device and is implemented by a MAC entity. Here, the MAC entity includes a beam fault detection procedure, a beam fault recovery procedure, and a multiplexing and reassembly entity (hereinafter also referred to as a multiplexing and reassembly procedure), etc. Lower layers of the embodiment of the present invention include, for example, a physical layer, an antenna unit, a measurement procedure, etc. For specific concepts and definitions of each layer and each entity, reference may be made to related art, and descriptions thereof will be omitted in the embodiments of the present invention.

[0057] Example 1 An embodiment of the present invention provides a method for reporting beam failure information, which is explained from the perspective of a terminal device. Figure 6 is a schematic diagram of an example of the method for reporting beam failure information according to an embodiment of the present invention. As shown in Figure 6, the method includes the following steps:

[0058] Step 601: The terminal device determines that candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) has been completed in a secondary cell where a beam failure has occurred.

[0059] Step 602: The terminal device reports to the network device that a beam failure has occurred in the secondary cell.

[0060] It should be noted that the above-mentioned FIG. 6 merely illustrates an example of the present invention, and the present invention is not limited thereto. For example, the execution order of various steps may be appropriately adjusted, some other steps may be added, or some steps may be removed. Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of the above-mentioned FIG. 6.

[0061] In an embodiment of the present invention, a candidate beam based on an SSB or a CSI-RS can be detected. Specifically, for example, if the L1-RSRP of an SSB / CSI-RS included in the reference signal list of candidate beams for recovery, candidateBeamRSSCellList, is greater than a threshold within an evaluation period, the index of this SSB / CSI-RS is included in the Candidate RS ID field of the MAC CE. The index is the index of the entry to which the SSB / CSI-RS corresponds in candidateBeamRSSCellList. For example, index 0 corresponds to the first entry in candidateBeamRSSCellList, index 1 corresponds to the second entry in this list, and so on.

[0062] In some aspects, the step in step 601 in which the terminal device determines that candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) has been completed in a secondary cell in which a beam failure has occurred specifically includes a step of determining by a medium access control (MAC) entity of the terminal device that candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed in the secondary cell, and / or receiving a candidate beam identifier of the secondary cell from a lower layer by the medium access control (MAC) entity of the terminal device.

[0063] In some aspects, the medium access control (MAC) entity of the terminal device does not report that a beam failure has occurred in the secondary cell before candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within the evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal in the secondary cell.

[0064] For example, the MAC entity of the terminal device does not report that a beam failure has occurred in a cell before SSB / CSI-RS based candidate beam detection is completed in a cell, or before receiving a candidate RS ID for a cell from a lower layer, or during the evaluation period of SSB / CSI-RS based candidate beam detection in a cell, or when the lower layer is performing SSB / CSI-RS based candidate beam detection in a cell, or when the lower layer has not completed SSB / CSI-RS based candidate beam detection in a cell, or before the evaluation period of SSB / CSI-RS based candidate beam detection in a cell ends.

[0065] This prevents the network device from knowing that a beam failure has occurred in this cell and performing beam management for this cell to configure an inappropriate beam for this cell, but instead waits for subsequent receipt of a failure indication carrying candidate beam information (RS ID) and reconfigures based on that information.

[0066] In some aspects, if a secondary cell has triggered beam failure recovery and the beam failure recovery is not canceled, instructs the generation of a corresponding medium access control (MAC) control element (CE) or a shortened medium access control (MAC) control element (CE).

[0067] In some aspects, the medium access control (MAC) entity does not report in the medium access control (MAC) control element (CE) or shortened medium access control (MAC) control element (CE) that a beam failure has occurred in the secondary cell.

[0068] For example, the medium access control (MAC) entity sets the indication information (Ci field) corresponding to the secondary cell in the medium access control (MAC) control element (CE) or shortened medium access control (MAC) control element (CE) to 0 and does not include a field carrying candidate beam information corresponding to the secondary cell (AC field).

[0069] In some aspects, the fault may not be detected or may be considered not to have been detected.

[0070] For example, in the case of BFR MAC CE, the meaning of the Ci field is as shown in Table 1.

[0071] [Table 1] For example, in the case of a Truncated BFR MAC CE, the meaning of the Ci field is as shown in Table 2.

[0072] [Table 2] In some aspects, the byte containing the AC field may be considered not to exist.

[0073] For example, in the case of BFR MAC CE, the meaning of the Ci field is as shown in Table 3.

[0074] [Table 3] For example, in the case of a Truncated BFR MAC CE, the meaning of the Ci field is as shown in Table 4.

[0075] [Table 4] In an embodiment of the present invention, the timing at which the MAC entity instructs the multiplexing and assembly procedure to generate a MAC CE may differ from the timing of generation and assembly by the multiplexing and assembly procedure, so the contents and size of the MAC CE may change.

[0076] Here, we will explain whether to use BFR MAC CE or Truncated BFR MAC CE.

[0077] In some aspects, the medium access control (MAC) entity directs the multiplexing and assembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE), and generates a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the multiplexing and assembly procedure.

[0078] For example, when the MAC entity instructs the multiplexing and assembly procedure to generate a BFR MAC CE, the multiplexing and assembly procedure can generate a BFR MAC CE or a truncated BFR MAC CE. For example, the multiplexing and assembly procedure can generate a BFR MAC CE or a truncated BFR MAC CE based on the UL grant size. This allows for appropriate adjustment depending on the UL grant, etc., and is advantageous in providing more beam failure and recovery information or saving signaling overhead.

[0079] Taking FIG. 4 as an example, at time t0, if the beam failure recovery procedure determines that at least one BFR has been triggered and not canceled, and if UL-SCH resources are available for new transmission and, as a result of the LCP, this UL-SCH resource can accommodate the BFR MAC CE and its subheader, the MAC entity instructs the multiplexing and assembly process to generate the BFR MAC CE.

[0080] However, at time t2, i.e., when a MAC CE is generated in the multiplexing and assembly procedure, for example because the number of cells that need to report beam failure and recovery information increases or information with higher priority for generating a MAC CE is required, if, as a result of the LCP, this UL-SCH resource cannot accommodate a BFR MAC CE and its subheader but can accommodate a truncated BFR MAC CE and its subheader, the multiplexing and assembly procedure can generate a truncated BFR MAC CE.

[0081] In some aspects, a medium access control (MAC) entity instructs a multiplexing and assembly procedure to generate an abbreviated beam failure recovery (BFR) medium access control (MAC) control element (CE), and generates a beam failure recovery (BFR) medium access control (MAC) control element (CE) or an abbreviated beam failure recovery (BFR) medium access control (MAC) control element (CE) in the multiplexing and assembly procedure.

[0082] For example, when the MAC entity instructs the multiplexing and assembly procedure to generate a truncated BFR MAC CE, the multiplexing and assembly procedure can generate a BFR MAC CE or a truncated BFR MAC CE. For example, the multiplexing and assembly procedure can generate a BFR MAC CE or a truncated BFR MAC CE based on the UL grant size. This allows for appropriate adjustment depending on the UL grant, etc., and is advantageous in providing more beam failure and recovery information or saving signaling overhead.

[0083] Taking FIG. 4 as an example, at time t0, if the beam failure recovery procedure determines that at least one BFR has been triggered and not canceled, and if a UL-SCH resource is available for a new transmission and, as a result of the LCP, this UL-SCH resource cannot accommodate a BFR MAC CE plus subheader but can accommodate a Truncated BFR MAC CE plus subheader, the MAC entity instructs the multiplexing and assembly procedure to generate a Truncated BFR MAC CE.

[0084] However, at time t2, i.e., when a MAC CE is generated in the multiplexing and assembly procedure, if, as a result of the LCP, UL-SCH resources are available for new transmissions, for example because the number of cells that need to report beam failure and recovery information has decreased or higher priority information that should have been transmitted no longer needs to be transmitted, and if, as a result of the LCP, this UL-SCH resource can accommodate a BFR MAC CE and its subheader, the multiplexing and assembly process can generate a BFR MAC CE.

[0085] In some aspects, the medium access control (MAC) entity instructs the multiplexing and assembly procedure to generate a medium access control (MAC) control element (CE) that carries beam failure and recovery information of the secondary cell, and generates a beam failure recovery (BFR) medium access control (MAC) control element (CE) or an abbreviated beam failure recovery (BFR) medium access control (MAC) control element (CE) in the multiplexing and assembly procedure.

[0086] Here, in the multiplexing and assembly procedure, it is decided whether to generate a beam fault recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam fault recovery (BFR) medium access control (MAC) control element (CE).

[0087] For example, the MAC entity instructs the multiplexing and assembly procedure to generate a MAC CE, which carries beam failure detection and recovery information for the secondary cell and includes, for example, a BFR MAC CE or a truncated BFR MAC CE. The multiplexing and assembly procedure determines whether to generate a BFR MAC CE or a truncated BFR MAC CE. For example, the multiplexing and assembly procedure determines and generates a BFR MAC CE or a truncated BFR MAC CE based on the result of the LCP of the available UL-SCH resources for new transmission. In this way, the multiplexing and assembly procedure determines and generates a BFR MAC CE or a truncated BFR MAC CE, which helps to increase flexibility.

[0088] Taking FIG. 4 as an example, at time t0, if the beam failure recovery process determines that at least one BFR has been triggered and not canceled, the MAC entity instructs the MAC CE to generate a multiplexing and assembly procedure carrying the beam failure and recovery information of the secondary cell.

[0089] At time t2, i.e., when this MAC CE is generated in the multiplexing and assembly procedure, the multiplexing and assembly procedure can determine and generate the BFR MAC CE when, as a result of the LCP, this UL-SCH resource can accommodate the BFR MAC CE and its subheader.

[0090] At time t2, i.e., when a MAC CE is generated in the multiplexing and reassembly procedure, if, as a result of the LCP, this UL-SCH resource cannot accommodate a BFR MAC CE and its subheader, but can accommodate a Truncated BFR MAC CE and its subheader, the multiplexing and reassembly procedure can determine and generate a Truncated BFR MAC CE.

[0091] In some aspects, a medium access control (MAC) entity instructs the multiplexing and assembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE), and the multiplexing and assembly procedure generates the beam failure recovery (BFR) medium access control (MAC) control element (CE) upon receiving the medium access control (MAC) entity's instruction.

[0092] Alternatively, the medium access control (MAC) entity instructs the multiplexing and assembly procedure to generate an abbreviated beam failure recovery (BFR) medium access control (MAC) control element (CE), and the multiplexing and assembly procedure generates the abbreviated beam failure recovery (BFR) medium access control (MAC) control element (CE) upon receiving the instruction from the medium access control (MAC) entity.

[0093] For example, the time at which the MAC entity instructs the multiplexing and assembly procedure to generate a MAC CE is the same as the time at which the multiplexing and assembly procedure generates it, i.e., if the MAC entity instructs the multiplexing and assembly procedure to generate a (truncated) BFR MAC CE, the multiplexing and assembly procedure immediately generates the (truncated) BFR MAC CE.

[0094] 4 as an example, at time t0, if the beam failure recovery procedure determines that at least one BFR has been triggered and not canceled, an UL-SCH resource is available for a new transmission, and if the UL-SCH resource can accommodate a BFR MAC CE and its subheader as a result of the LCP, the MAC entity instructs the multiplexing and assembly procedure to generate a BFR MAC CE. At time t0, the multiplexing and assembly procedure generates a BFR MAC CE.

[0095] 4 as an example, at time t0, if the beam failure recovery procedure determines that at least one BFR has been triggered and not canceled, a UL-SCH resource is available for a new transmission, and as a result of the LCP, this UL-SCH resource cannot accommodate a BFR MAC CE plus subheader but can accommodate a truncated BFR MAC CE plus subheader, the MAC entity instructs the multiplexing and assembly procedure to generate a truncated BFR MAC CE. At time t0, the multiplexing and assembly procedure generates a truncated BFR MAC CE.

[0096] The above has been a brief description of the BFR MAC CE or the Truncated BFR MAC CE, and the following will describe the MAC CE of Format 1 or Format 2.

[0097] In the existing mechanism, the MAC entity determines whether to use Format 1 or Format 2 MAC CE based on the highest serving cell index, ServCellIndex, of the secondary cell in which the MAC entity detects a beam failure.

[0098] For example, suppose that secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failures. According to the current mechanism, if the highest serving cell index of the secondary cells that detected the beam failures, ServCellIndex=10, is greater than 8, the MAC entity determines to use Format 2 MAC CE, i.e., a bitmap including 4 bytes. In an embodiment of the present invention, for example, one secondary cell may detect a beam failure but not report it to the network device. Therefore, if the secondary cell with ServCellIndex=10 detects a beam failure but does not report it, the MAC entity determines that Format 1 MAC CE (a bitmap including 1 byte) is sufficient and does not need to use Format 1 MAC CE (a bitmap including 4 bytes). Therefore, the existing mechanism increases signaling overhead.

[0099] In some aspects, the decision to use either Format 1 or Format 2 is based on the highest serving cell index ServCellIndex of the secondary cells whose corresponding indication information (Ci field) in this MAC entity is set to 1. This can reduce signaling overhead.

[0100] For example, the terminal device uses a beam failure recovery (BFR) medium access control (MAC) control element (CE) of a first format when the highest serving cell index ServCellIndex for which the indication information (Ci field) corresponding to a secondary cell in the medium access control (MAC) entity is set to 1 is smaller than 8, and uses a beam failure recovery (BFR) medium access control (MAC) control element (CE) of a second format when the highest serving cell index ServCellIndex for which the indication information (Ci field) is set to 1 is greater than or equal to 8.

[0101] For example, for BFR MAC CE, if the highest serving cell index ServCellIndex with Ci field set to 1 corresponding to a secondary cell in one MAC entity is less than 8, use format 1 shown in Figure 2, otherwise use format 2 shown in Figure 3.

[0102] For the meaning of the above, please refer to Table 5.

[0103] [Table 5] Furthermore, for example, if the AC field is set to 1, it means that a Candidate RS ID field is present in this byte containing the AC field, and the Candidate RS ID field is an index of an SSB or a CSI-RS. If the AC field is set to 0, it means that a Candidate RS ID field is not present in this byte containing the AC field, and the remaining bits of this byte are idle bits.

[0104] For example, assume that secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failure, but in this embodiment of the present invention, the beam failure of the secondary cell with ServCellIndex=10 is not reported. In this case, C2=1, C10=0, the highest serving cell index ServCellIndex=2 with the Ci field corresponding to the secondary cell set to 1, and if ServCellIndex=2 is smaller than 8, format 1 shown in Fig. 2, i.e., a 1-byte bitmap BFR MAC CE, is used. This can reduce signaling overhead.

[0105] Also, for example, if the highest serving cell index in which the indication information (Ci field) corresponding to a secondary cell in the medium access control (MAC) entity is set to 1 is smaller than 8, or if the Ci field corresponding to a special cell is set to 1 and the special cell is included in a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) and the uplink resources cannot accommodate a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the second format, the terminal device uses a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the first format, and otherwise uses a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the second format.

[0106] For example, for a Truncated BFR MAC CE, if the highest serving cell index ServCellIndex in which the Ci field corresponding to a secondary cell in one entity is set to 1 is less than 8, or if the Ci field corresponding to a special cell is 1 and the special cell is included in the Truncated BFR MAC CE and the UL-SCH resources cannot accommodate the Truncated BFR MAC CE and its subheader in Format 2 of Figure 3 as a result of the LCP, Format 1 shown in Figure 2 is used, and otherwise Format 2 shown in Figure 3 is used, thereby making it possible to reduce signaling overhead.

[0107] For the meaning of the above, please refer to Table 6.

[0108] [Table 6] Furthermore, for example, if the AC field is set to 1, it means that a Candidate RS ID field is present in this byte containing the AC field, and the Candidate RS ID field is an index of an SSB or a CSI-RS. If the AC field is set to 0, it means that a Candidate RS ID field is not present in this byte containing the AC field, and the remaining bits of this byte are idle bits.

[0109] For example, assume that secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failures for a Truncated BFR MAC CE, but in this embodiment of the present invention, the beam failure of the secondary cell with ServCellIndex=10 is not reported. In this case, C2=1, C10=0, the Ci field corresponding to the secondary cell is set to 1, and the highest serving cell index, ServCellIndex=2, is less than 8. Therefore, Format 1 shown in Fig. 2, i.e., a 1-byte bitmap Truncated BFR MAC CE, is used. This can reduce signaling overhead.

[0110] In some aspects, the determination of whether Format 1 or Format 2 is used is based on the highest serving cell index, ServCellIndex, of the secondary cells that reported beam failure in this MAC entity, which can reduce signaling overhead.

[0111] For example, the terminal device uses a beam failure recovery (BFR) medium access control (MAC) control element (CE) of the first format when the highest serving cell index ServCellIndex of the secondary cell for which a beam failure has been reported in one medium access control (MAC) entity is less than 8. The terminal device uses a beam failure recovery (BFR) medium access control (MAC) control element (CE) of the second format when the highest serving cell index ServCellIndex of the secondary cell for which a beam failure has been reported in one medium access control (MAC) entity is 8 or greater.

[0112] For example, for BFR MAC CE, assume that secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failure, but in this embodiment of the present invention, the beam failure of the secondary cell with ServCellIndex=10 is not reported. In this case, the highest serving cell index that reported the beam failure of the secondary cell, ServCellIndex=2, is less than 8, and the BFR MAC CE in format 1 shown in Figure 2, i.e., a 1-byte bitmap, is used.

[0113] As another example, if the highest serving cell index ServCellIndex of the secondary cells reporting the beam failure in one medium access control (MAC) entity is less than 8, or if the terminal device reports the beam failure of a special cell and the special cell is included in a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), and the uplink resources cannot accommodate the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the second format, the terminal device uses the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the first format. Otherwise, the terminal device uses the shortened beam failure recovery (MAC) medium access control (BFR) control element (MAC) in the second format.

[0114] For example, assume that secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failure for a Truncated BFR MAC CE, but in an embodiment of the present invention, the beam failure of the secondary cell with ServCellIndex=10 is not reported. In this case, the highest serving cell index reporting the beam failure of a secondary cell, ServCellIndex=2, is less than 8, and Format 1 shown in Fig. 2, i.e., a 1-byte bitmap Truncated BFR MAC CE, is used.

[0115] As another example, the terminal device uses the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) of the first format if the highest serving cell index ServCellIndex of secondary cells reporting beam failure in one medium access control (MAC) entity is less than 8, or if the beam failure is detected by a special cell, the special cell is included in the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), and the uplink resources cannot accommodate the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) of the second format. Otherwise, the terminal device uses the shortened beam failure recovery (MAC) medium access control (BFR) control element (MAC) of the second format.

[0116] In some aspects, the beam failure is detected within this MAC entity and the decision to use either Format 1 or Format 2 is made based on the highest serving cell index, ServCellIndex, of the secondary cell reporting the beam failure, thereby reducing signaling overhead.

[0117] For example, the terminal device uses a beam failure recovery (BFR) medium access control (MAC) control element (CE) of the first format when the terminal device detects a beam failure in one medium access control (MAC) entity and the highest serving cell index of the secondary cell for which the beam failure is reported is less than 8. When the terminal device detects a beam failure in the medium access control (MAC) entity and the highest serving cell index of the secondary cell for which the beam failure is reported is 8 or greater, the terminal device uses a beam failure recovery (BFR) medium access control (MAC) control element (CE) of the second format.

[0118] For example, assume that secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failure for BFR MAC CE, but in the embodiment of the present invention, the beam failure of the secondary cell with ServCellIndex=10 is not reported. In this case, the highest serving cell index ServCellIndex=2 where beam failure is detected and secondary cell beam failure is reported is less than 8, and the BFR MAC CE in format 1 shown in Figure 2, i.e., 1-byte bitmap, is used.

[0119] Also, for example, if the terminal device detects a beam failure in one medium access control (MAC) entity and the highest serving cell index of the secondary cell reporting the beam failure is less than 8, or if a special cell detects a beam failure and reports the beam failure of the special cell, and the special cell is included in a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), and the uplink resources cannot accommodate the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) of the second format, the terminal device uses the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) of the first format. Otherwise, the terminal device uses the shortened beam failure recovery (MAC) medium access control (BFR) control element (MAC) of the second format.

[0120] For example, assume that secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failure for a Truncated BFR MAC CE, but in an embodiment of the present invention, the beam failure of the secondary cell with ServCellIndex=10 is not reported. In this case, the highest serving cell index ServCellIndex=2 where beam failure is detected and secondary cell beam failure is reported is less than 8, and so Format 1 shown in Figure 2, i.e., a 1-byte bitmap Truncated BFR MAC CE, is used.

[0121] Also, for example, if the terminal device detects a beam failure in one medium access control (MAC) entity and the highest serving cell index of the secondary cell reporting the beam failure is less than 8, or if a special cell detects a beam failure and the special cell is included in a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), and the uplink resources cannot accommodate the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the second format, the terminal device uses the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the first format. Otherwise, the terminal device uses the shortened beam failure recovery (MAC) medium access control (BFR) control element (MAC) in the second format.

[0122] In some aspects, the MAC entity determines whether to use Format 1 or Format 2 based on the highest serving cell index ServCellIndex of a secondary cell for which beam failure has been detected and candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed, thereby reducing signaling overhead.

[0123] For example, the terminal device uses a first format beam failure recovery (BFR) medium access control (MAC) control element (CE) when it detects beam failure within one medium access control (MAC) entity and the highest serving cell index of the secondary cell that has completed candidate beam detection based on a synchronization signal block or a channel state information reference signal is less than 8.

[0124] When a beam failure is detected in one medium access control (MAC) entity and the highest serving cell index of a secondary cell for which candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed is 8 or greater, a second format beam failure recovery (BFR) medium access control (MAC) control element (CE) is used.

[0125] For example, for BFR MAC CE, assume that secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failure, but in this embodiment of the present invention, ServCellIndex=10 has not completed candidate beam detection based on a synchronization signal block or a channel state information reference signal. In this case, the highest serving cell index of the secondary cell where beam failure is detected and candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed, ServCellIndex=2, is less than 8, and the BFR MAC CE in format 1 shown in Figure 2, i.e., a 1-byte bitmap, is used.

[0126] Furthermore, for example, if the highest serving cell index of a secondary cell that has detected beam failure in one medium access control (MAC) entity and completed candidate beam detection based on a synchronization signal block or a channel state information reference signal is less than 8, or if a special cell has detected beam failure and completed candidate beam detection based on a synchronization signal block or a channel state information reference signal, and the special cell is included in a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), and the uplink resources cannot accommodate a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the second format, the terminal device uses the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the first format. Otherwise, the terminal device uses the shortened beam failure recovery (MAC) medium access control (BFR) control element (MAC) in the second format.

[0127] For example, for a Truncated BFR MAC CE, assume that secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failure, but in this embodiment of the present invention, ServCellIndex=10 has not completed candidate beam detection based on a synchronization signal block or a channel state information reference signal. In this case, the highest serving cell index of the secondary cell where beam failure is detected and candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed, ServCellIndex=2, is less than 8, and therefore Format 1 shown in Figure 2, i.e., a 1-byte bitmap Truncated BFR MAC CE, is used.

[0128] As another example, if the terminal device detects a beam failure within one medium access control (MAC) entity and the highest serving cell index of a secondary cell that has completed candidate beam detection based on a synchronization signal block or a channel state information reference signal is less than 8, or if a special cell detects a beam failure and the special cell is included in a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), and the uplink resources cannot accommodate a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the second format, the terminal device uses the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the first format. Otherwise, the terminal device uses the shortened beam failure recovery (MAC) medium access control (BFR) control element (MAC) in the second format.

[0129] In some aspects, the MAC entity determines whether to use Format 1 or Format 2 based on the highest serving cell index ServCellIndex of a secondary cell for which a beam failure has been detected and a candidate beam identifier has been determined or for which no candidate beam has been determined, thereby reducing signaling overhead.

[0130] For example, if the terminal device detects a beam failure within one medium access control (MAC) entity and a candidate beam identifier has been determined or the highest serving cell index of a secondary cell determined to have no candidate beam is less than 8, it uses a first format beam failure recovery (BFR) medium access control (MAC) control element (CE).

[0131] If a beam failure is detected within the medium access control (MAC) entity and a candidate beam identifier has been determined, or if the maximum serving cell index of the secondary cell for which no candidate beam has been determined is 8 or greater, a second format beam failure recovery (BFR) medium access control (MAC) control element (CE) is used.

[0132] For example, in the case of BFR MAC CE, assume that secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failure, but in this embodiment of the present invention, the secondary cell with ServCellIndex=10 has not determined a candidate beam identifier or determined that there is no candidate beam. In this case, the highest serving cell index of the secondary cell for which beam failure has been detected and a candidate beam identifier has been determined, or for which there is determined to be no candidate beam, ServCellIndex=2 is less than 8, and the BFR MAC CE in format 1 shown in Figure 2, i.e., a 1-byte bitmap, is used.

[0133] As another example, if the terminal device detects a beam failure in one medium access control (MAC) entity, and a candidate beam identifier has been determined, or if the highest serving cell index of a secondary cell for which no candidate beam has been determined is less than 8, or if a special cell detects a beam failure, and a candidate beam identifier has been determined, or if no candidate beam has been determined, and the special cell is included in a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), and the uplink resources cannot accommodate a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the second format, the terminal device uses the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the first format. Otherwise, the terminal device uses the shortened beam failure recovery (MAC) medium access control (BFR) control element (MAC) in the second format.

[0134] For example, in the case of a truncated BFR MAC CE, it is assumed that secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failure, but in an embodiment of the present invention, the secondary cell with ServCellIndex=10 has not determined a candidate beam identifier or determined that there is no candidate beam. In this case, the highest serving cell index ServCellIndex=2 of the secondary cell that has detected beam failure and determined a candidate beam identifier or determined that there is no candidate beam is less than 8, and the truncated BFR MAC CE in format 1 shown in Figure 2, i.e., a 1-byte bitmap, is used.

[0135] As another example, if the terminal device detects a beam failure and determines a candidate beam identifier within one medium access control (MAC) entity, or if the maximum serving cell index of a secondary cell determined to have no candidate beam is less than 8, or if a special cell detects a beam failure and the special cell is included in a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), and the uplink resources cannot accommodate the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the second format, the terminal device uses the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the first format. Otherwise, the terminal device uses the shortened beam failure recovery (MAC) medium access control (BFR) control element (MAC) in the second format.

[0136] In some aspects, the MAC entity determines whether to use Format 1 or Format 2 based on the highest serving cell index ServCellIndex of a secondary cell for which a beam failure has been detected and which is not within the evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal, thereby reducing signaling overhead.

[0137] For example, when a terminal device detects a beam failure within one medium access control (MAC) entity and the highest serving cell index of a secondary cell that is not in the evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal is less than 8, the terminal device uses a first format beam failure recovery (BFR) medium access control (MAC) control element (CE).

[0138] When a beam failure is detected in one medium access control (MAC) entity and the maximum serving cell index of a secondary cell that is not in the evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal is 8 or greater, a second format beam failure recovery (BFR) medium access control (MAC) control element (CE) is used.

[0139] For example, for BFR MAC CE, assume that secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failure, but in this embodiment of the present invention, the secondary cell with ServCellIndex=10 is within the evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal. In this case, the highest serving cell index of the secondary cell where beam failure has been detected and which is not within the evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal, ServCellIndex=2, is less than 8, and the BFR MAC CE in format 1 shown in Figure 2, i.e., a 1-byte bitmap, is used.

[0140] Furthermore, for example, if the terminal device detects a beam failure in one medium access control (MAC) entity and the highest serving cell index of a secondary cell that is not in an evaluation period for candidate beam detection based on a synchronization signal block or a channel state information reference signal is less than 8, or if the terminal device detects a beam failure in a special cell that is not in an evaluation period for candidate beam detection based on a synchronization signal block or a channel state information reference signal and the special cell is included in a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), and the uplink resources cannot accommodate a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the second format, the terminal device uses the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the first format. Otherwise, the terminal device uses the shortened beam failure recovery (MAC) medium access control (BFR) control element (MAC) in the second format.

[0141] For example, for a Truncated BFR MAC CE, assume that secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failure, but in an embodiment of the present invention, the secondary cell with ServCellIndex=10 is within the evaluation period for candidate beam detection based on a synchronization signal block or a channel state information reference signal. In this case, the highest serving cell index of the secondary cell that has detected beam failure and is not within the evaluation period for candidate beam detection based on a synchronization signal block or a channel state information reference signal, ServCellIndex=2, is less than 8, and the Truncated BFR MAC CE in Format 1 shown in Figure 2, i.e., a 1-byte bitmap, is used.

[0142] As another example, if the terminal device detects a beam failure within one medium access control (MAC) entity and the highest serving cell index of a secondary cell that is not in an evaluation period for candidate beam detection based on a synchronization signal block or a channel state information reference signal is less than 8, or if a special cell detects a beam failure and the special cell is included in a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), and the uplink resources cannot accommodate a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the second format, the terminal device uses the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the first format. Otherwise, the terminal device uses the shortened beam failure recovery (MAC) medium access control (BFR) control element (MAC) in the second format.

[0143] In some aspects, the decision to use Format 1 or Format 2 is based on the highest serving cell index, ServCellIndex, of the secondary cell for which a beam failure is deemed to have been detected within this MAC entity, thereby reducing signaling overhead.

[0144] For example, the terminal device uses a first format beam failure recovery (BFR) medium access control (MAC) control element (CE) if the highest serving cell index of the secondary cell in which beam failure is considered to have been detected in one medium access control (MAC) entity is less than 8.

[0145] In one medium access control (MAC) entity, if the highest serving cell index of the secondary cell in which beam failure is considered to be detected is 8 or greater, a second format beam failure recovery (BFR) medium access control (MAC) control element (CE) is used.

[0146] For example, for a BFR MAC CE, suppose that the secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failure, but in this embodiment of the present invention, the secondary cell with ServCellIndex=10 is not considered to have detected beam failure, or the secondary cell with ServCellIndex=10 is considered to have not detected beam failure. In this case, the highest serving cell index of the secondary cell in which beam failure is detected, ServCellIndex=2, is less than 8, and the BFR MAC CE in format 1 shown in Figure 2, i.e., a 1-byte bitmap, is used.

[0147] As another example, the terminal device uses the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) of the first format if the highest serving cell index of the secondary cell in which a beam failure is detected in one medium access control (MAC) entity is less than 8, or if a special cell detects a beam failure and the special cell is included in the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), and the uplink resources cannot accommodate the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) of the second format. Otherwise, the terminal device uses the shortened beam failure recovery (MAC) medium access control (BFR) control element (MAC) of the second format.

[0148] For example, suppose that the secondary cells with ServCellIndex=2 and ServCellIndex=10 detect beam failure for a Truncated BFR MAC CE, but in this embodiment of the present invention, the secondary cell with ServCellIndex=10 is not considered to have detected beam failure, or the secondary cell with ServCellIndex=10 is considered to have not detected beam failure. In this case, the highest serving cell index of the secondary cell in which beam failure is considered to have been detected, ServCellIndex=2, is less than 8, and Format 1 shown in Fig. 2, i.e., a 1-byte bitmap Truncated BFR MAC CE, is used.

[0149] As another example, the terminal device uses a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) of the first format if the highest serving cell index of a secondary cell in which a beam failure is detected in one medium access control (MAC) entity is less than 8, or if a beam failure is detected and the special cell is included in a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), and the uplink resources cannot accommodate a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) of the second format. Otherwise, the terminal device uses a shortened beam failure recovery (MAC) medium access control (BFR) control element (MAC) of the second format.

[0150] In some aspects, when a terminal device transmits a medium access control (MAC) protocol data unit (PDU) including beam failure information of a secondary cell, the terminal device does not cancel beam failure recovery triggered in the secondary cell before assembling the medium access control (MAC) protocol data unit (PDU).

[0151] For example, if a MAC PDU is transmitted and this PDU contains a BFR MAC CE or a Truncated BFR MAC CE, where the MAC CE contains beam failure information of a secondary cell, all BFR(s) triggered by this secondary cell for beam failure recovery before the MAC PDU is assembled must be canceled.

[0152] As another example, if BFR(s) are triggered in one secondary cell for beam failure recovery, the MAC entity may not need to report that a beam failure has occurred in that secondary cell. When the terminal device transmits a MAC PDU and this PDU includes a BFR MAC CE or a Truncated BFR MAC CE containing beam failure information for this secondary cell, the MAC entity cancels the BFR(s) already triggered in this secondary cell before assembling the MAC PDU, except that it does not report the BFR(s) already triggered in the secondary cell where the beam failure has occurred.

[0153] For example, before SSB / CSI-RS based candidate beam detection on one cell is completed, or before RS ID based candidate beam detection on one cell is received from a lower layer, or within the evaluation period of SSB / CSI-RS based candidate beam detection on one cell, or when a lower layer is performing SSB / CSI-RS based candidate beam detection on one cell, or when a lower layer has not completed SSB / CSI-RS based candidate beam detection on one cell, or before the evaluation period of SSB / CSI-RS based candidate beam detection on one cell ends, if the MAC entity of the terminal device instructs a multiplexing and assembly procedure to generate a MAC PDU and this MAC PDU includes a BFR MAC CE or a Truncated BFR MAC CE, the MAC entity does not report that a beam failure has occurred in the cell in the BFR MAC CE or Truncated BFR MAC CE in this MAC PDU, and further, when the MAC PDU is transmitted, Do not cancel any BFR(s) already triggered in the cell before assembling the PDU.

[0154] For example, one terminal configures secondary cell 1 and secondary cell 2, and both secondary cell 1 and secondary cell 2 have triggered BFR(s). If a MAC PDU is transmitted and a BFR MAC CE is included in this PDU and beam failure information of secondary cell 1 and secondary cell 2 is included in this BFR MAC CE, all BFR(s) triggered in secondary cell 1 and secondary cell 2 are canceled. Alternatively, one terminal configures secondary cell 1 and secondary cell 2, and both secondary cell 1 and secondary cell 2 have triggered BFR(s). If a MAC PDU is transmitted and a BFR MAC CE is included in this BFR MAC CE and beam failure information of secondary cell 1 is included in this BFR MAC CE, but secondary cell 2 does not report that a beam failure has occurred, all BFR(s) triggered in secondary cell 1 are canceled, but the BFR(s) triggered in secondary cell 2 are not canceled.

[0155] The above-described embodiments are merely illustrative of the present invention, and the present invention is not limited thereto. Appropriate modifications may be made based on the above-described embodiments. For example, each of the above-described embodiments may be used alone, or one or more of the above-described embodiments may be used in combination.

[0156] According to this embodiment, when the terminal device completes candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) in a secondary cell where a beam failure occurs, the terminal device reports to the network device that a beam failure has occurred in the secondary cell. This prevents the network device from configuring an inappropriate beam for the terminal device, thereby reducing or avoiding the inability to recover from the beam failure.

[0157] <Example 2> The embodiment of the present invention provides a method for reporting beam failure information, and will be described starting from the terminal device. Description of the same content as in the first embodiment will be omitted.

[0158] 7 is a schematic diagram of another example of a method for reporting beam failure information according to an embodiment of the present invention. As shown in FIG. 7, the method includes the following steps:

[0159] Step 701: The terminal device determines that candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) has been completed in a secondary cell where a beam failure has occurred.

[0160] Step 702: The terminal device reports a medium access control (MAC) protocol data unit (PDU) including beam failure information of the secondary cell to the network device.

[0161] It should be noted that the above-mentioned FIG. 7 merely illustrates an example of the present invention, and the present invention is not limited thereto. For example, the execution order of various steps may be appropriately adjusted, some other steps may be added, or some steps may be removed. Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of the above-mentioned FIG. 7.

[0162] In some aspects, the step in which the terminal device determines in step 701 that candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) has been completed in a secondary cell in which a beam failure has occurred includes determining by a medium access control (MAC) entity of the terminal device that candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed in the secondary cell, and / or receiving a candidate beam identifier of the secondary cell from a lower layer by the medium access control (MAC) entity of the terminal device.

[0163] In some aspects, before candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within an evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal in the secondary cell, the medium access control (MAC) entity of the terminal device does not instruct the multiplexing and assembly procedure to generate a MAC CE carrying beam failure and recovery information for the secondary cell, the MAC CE including a beam failure recovery (BFR) medium access control (MAC) control element (CE) or an abbreviated beam failure recovery (BFR) medium access control (MAC) control element (CE).

[0164] For example, the BFR MAC CE or the Truncated MAC CE may use Format 1 (shown in FIG. 2) or Format 2 (shown in FIG. 3). For details of the BFR MAC CE or the Truncated MAC CE, reference may be made to Example 1.

[0165] This prevents the network device from knowing that a beam failure has occurred in this cell and performing beam management for this cell to configure an inappropriate beam for this cell, but instead waits for subsequent receipt of a failure indication carrying candidate beam information (RS ID) and reconfigures based on that information.

[0166] In some aspects, the step of the medium access control (MAC) entity of the terminal device not instructing the multiplexing and assembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) includes the steps of:

[0167] If the secondary cell has triggered and not cancelled beam failure recovery, there are available uplink resources, and the uplink resources can accommodate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), the medium access control (MAC) entity does not instruct the multiplexing and reassembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE).

[0168] In some aspects, if at least one beam failure recovery has been triggered and not canceled in the beam failure recovery procedure, and candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed for at least one cell, or a candidate beam identifier for at least one cell has been received from a lower layer, the medium access control (MAC) entity instructs the multiplexing and assembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) based on uplink resources, or triggers a scheduling request (SR).

[0169] For example, one may refer to Table 7 for how to generate the BFR MAC CE.

[0170] [Table 7] In some aspects, in a beam failure recovery procedure, if beam failure recovery has been triggered and not canceled in at least one secondary cell, and candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed in at least one cell, or a candidate beam identifier for at least one cell has been received from a lower layer, the medium access control (MAC) entity instructs the multiplexing and assembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) based on uplink resources, or triggers a scheduling request (SR).

[0171] For example, one may refer to Table 8 for how to generate the BFR MAC CE.

[0172] [Table 8] In some aspects, when a terminal device transmits a medium access control (MAC) protocol data unit (PDU) including beam failure information of a secondary cell, the terminal device does not cancel beam failure recovery triggered in the secondary cell before assembling the medium access control (MAC) protocol data unit (PDU).

[0173] The above-described embodiments are merely illustrative of the present invention, and the present invention is not limited thereto. Appropriate modifications may be made based on the above-described embodiments. For example, each of the above-described embodiments may be used alone, or one or more of the above-described embodiments may be used in combination.

[0174] According to this embodiment, when the terminal device completes candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) in a secondary cell where a beam failure occurs, the terminal device reports a medium access control (MAC) protocol data unit (PDU) including beam failure information of the secondary cell to the network device. This prevents the network device from configuring an inappropriate beam for the terminal device, thereby reducing or avoiding the inability to recover from the beam failure.

[0175] Example 3 The following description will be based on Examples 1 and 2, and a description of the same content as Examples 1 and 2 will be omitted. Also, Example 3 may be implemented in combination with Examples 1 and 2, or may be implemented independently.

[0176] In some aspects, a terminal device detects that a beam failure has occurred in a secondary cell, and the terminal device does not report that a beam failure has occurred in the secondary cell before candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within an evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal in the secondary cell, and / or the multiplexing and assembly procedure does not instruct the generation of a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE).

[0177] For example, if only one cell has triggered BFR and before completing candidate beam detection based on SSB or CSI-RS in that cell, the MAC entity will not instruct the multiplexing and reassembly procedure to generate a (truncated) BFR MAC CE, thereby further saving signaling.

[0178] In some embodiments, Example 1 and Example 2 may be combined.

[0179] For example, if beam failure recovery is triggered in multiple cells and candidate beam detection is completed in at least one cell, the terminal device does not report that beam failure has occurred in the secondary cell. That is, the first embodiment may be implemented.

[0180] If beam failure recovery is triggered in multiple cells and candidate beam detection is not completed in all cells for which beam failure recovery is triggered, the terminal device does not instruct the multiplexing and assembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE). That is, embodiment 2 may be implemented.

[0181] The above-described embodiments are merely illustrative of the present invention, and the present invention is not limited thereto. Appropriate modifications may be made based on the above-described embodiments. For example, each of the above-described embodiments may be used alone, or one or more of the above-described embodiments may be used in combination.

[0182] According to this embodiment, the terminal device does not report that a beam failure has occurred in the secondary cell before candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier of the secondary cell, or within an evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal in the secondary cell, and / or does not instruct the multiplexing and reassembly procedure to generate a BFR MAC CE or a shortened BFR MAC CE. This prevents the network device from configuring an inappropriate beam for the terminal device, thereby reducing or avoiding the inability to recover from beam failure.

[0183] Example 4 The following description will be based on Examples 1 to 3, and a description of the same content as Examples 1 to 3 will be omitted. Also, Example 4 may be implemented in combination with Examples 1 to 3, or may be implemented independently.

[0184] In some aspects, a medium access control (MAC) entity of a terminal device generates a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) for the medium access control (MAC) entity if a secondary cell is configured in the medium access control (MAC) entity.

[0185] In some aspects, the indication information (Ci field) of the beam failure recovery (BFR) medium access control (MAC) control element (CE) being set to 1 indicates that a beam failure has been detected in a secondary cell with serving cell index i configured in the medium access control (MAC) entity and candidate beam information is included.

[0186] The indication information (Ci field) of the beam failure recovery (BFR) medium access control (MAC) control element (CE) is set to 0, which indicates that the secondary cell with serving cell index i is not configured in the medium access control (MAC) entity, or that no beam failure has been detected in the secondary cell, and no candidate beam information is included.

[0187] For example, for BFR MAC CE, the meaning of the Ci field is as shown in Table 9.

[0188] [Table 9] In some aspects, the indication information (Ci field) of the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) is set to 1, indicating that a beam failure has been detected in a secondary cell with serving cell index i configured in the medium access control (MAC) entity and candidate beam information is included.

[0189] The indication information (Ci field) of the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) is set to 0, indicating that the secondary cell with serving cell index i is not configured in the medium access control (MAC) entity, or that no beam failure has been detected in the secondary cell, and no candidate beam information is included.

[0190] For example, in the case of a Truncated BFR MAC CE, the meaning of the Ci field is as shown in Table 10.

[0191] [Table 10] The above-described embodiments are merely illustrative of the present invention, and the present invention is not limited thereto. Appropriate modifications may be made based on the above-described embodiments. For example, each of the above-described embodiments may be used alone, or one or more of the above-described embodiments may be used in combination.

[0192] According to this embodiment, the MAC entity of the terminal device generates a BFR MAC CE or a shortened BFR MAC CE for the MAC entity if a secondary cell is configured in the MAC entity, so that its Ci field is set to 1 only if a secondary cell is configured in the MAC entity, thereby further saving bits in the MAC CE.

[0193] <Example 5> An embodiment of the present invention provides a device for reporting beam failure information. The device may be, for example, a terminal device, or one or more elements or components configured in the terminal device. The description of the same content as in the first to fifth embodiments will be omitted.

[0194] 8 is a schematic diagram of an example of a beam failure information reporting device 800 according to an embodiment of the present invention. As shown in FIG. 8, the beam failure information reporting device 800 includes the following components:

[0195] The detector 801 detects candidate beams.

[0196] The reporting unit 802 reports beam failure in a secondary cell for which candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed.

[0197] In some aspects, the reporting unit 802 determines, via a media access control entity, that candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed for the secondary cell, and / or receives a candidate beam identifier for the secondary cell from a lower layer via the media access control entity.

[0198] In some aspects, the reporting unit 802 does not report that a beam failure has occurred in the secondary cell by the medium access control entity before candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within the evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal in the secondary cell.

[0199] In some aspects, as shown in FIG. 8, a beam obstruction information reporting device 800 includes the following components:

[0200] If the secondary cell has triggered beam failure recovery and the beam failure recovery has not been canceled, the generating unit 803 generates a corresponding medium access control control element or a shortened medium access control control element and assembles a medium access control protocol data unit. The medium access control entity does not report that a beam failure has occurred in the secondary cell in the medium access control control element or the shortened medium access control control element.

[0201] In some aspects, the medium access control entity sets the indication information corresponding to the secondary cell to 0 in the medium access control control element or shortened medium access control control element and does not include a field carrying candidate beam information corresponding to the secondary cell.

[0202] In some aspects, the media access control entity instructs the multiplexing and assembly procedure to generate a beam failure recovery media access control control element, and generates a beam failure recovery media access control control element or a shortened beam failure recovery media access control control element in the multiplexing and assembly procedure.

[0203] Alternatively, the medium access control entity instructs the multiplexing and assembly procedure to generate a shortened beam failure recovery medium access control control element, and generates a beam failure recovery medium access control control element or a shortened beam failure recovery medium access control control element in the multiplexing and assembly procedure.

[0204] In some aspects, the medium access control entity instructs the multiplexing and assembly procedure to generate a medium access control control element carrying beam failure and recovery information of the secondary cell, generates a beam failure recovery medium access control control element or an abbreviated beam failure recovery medium access control control element in the multiplexing and assembly procedure, and determines whether to generate a beam failure recovery medium access control control element or an abbreviated beam failure recovery medium access control control element in the multiplexing and assembly procedure.

[0205] In some aspects, the media access control entity instructs the multiplexing and assembly procedure to generate a beam failure recovery media access control control element, and the multiplexing and assembly procedure generates the beam failure recovery media access control control element upon receiving the instruction from the media access control entity.

[0206] Alternatively, the media access control entity instructs the multiplexing and assembly procedure to generate a shortened beam failure recovery media access control control element, and the multiplexing and assembly procedure generates the shortened beam failure recovery media access control control element upon receiving the instruction from the media access control entity.

[0207] In some aspects, if the highest serving cell index for which the indication information corresponding to a secondary cell in the medium access control entity is set to 1 is less than 8, a beam failure recovery medium access control control element of a first format is used, and if the highest serving cell index for which the indication information is set to 1 is 8 or greater, a beam failure recovery medium access control control element of a second format is used.

[0208] In some aspects, if the highest serving cell index in the media access control entity for which the indication information corresponding to a secondary cell is set to 1 is less than 8, or if a beam failure is detected in a special cell and the special cell is included in a shortened beam failure recovery media access control control element and the uplink resources cannot accommodate a shortened beam failure recovery media access control control element in the second format, the shortened beam failure recovery media access control control element in the first format is used, otherwise the shortened beam failure recovery media access control control element in the second format is used.

[0209] In some aspects, when transmitting a medium access control protocol data unit containing beam failure information of a secondary cell, the beam failure recovery triggered in the secondary cell is not canceled before assembling the medium access control protocol data unit.

[0210] In some aspects, the medium access control entity generates a beam failure recovery medium access control control element or a shortened beam failure recovery medium access control control element for the medium access control entity if a secondary cell is configured in the medium access control entity.

[0211] In some aspects, the indication information of the beam failure recovery medium access control control element being set to 1 indicates that beam failure has been detected in a secondary cell with serving cell index i configured in the medium access control entity and candidate beam information is included, and the indication information of the beam failure recovery medium access control control element being set to 0 indicates that the secondary cell with serving cell index i is not configured in the medium access control entity or that beam failure has not been detected in the secondary cell and candidate beam information is not included.

[0212] When the indication information of the shortened beam failure recovery medium access control control element is set to 1, it indicates that beam failure has been detected in the secondary cell with serving cell index i configured in the medium access control entity and candidate beam information is included, and when the indication information of the shortened beam failure recovery medium access control control element is set to 0, it indicates that the secondary cell with serving cell index i is not configured in the medium access control entity or that beam failure has not been detected in the secondary cell and candidate beam information is not included.

[0213] In some aspects, the reporting unit 802 reports to the network device a medium access control protocol data unit including beam failure information in a secondary cell for which candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed.

[0214] In some aspects, the reporting unit 802 determines, via a media access control entity, that candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed for a secondary cell, and / or receives a candidate beam identifier for the secondary cell from a lower layer via the media access control entity.

[0215] In some aspects, the media access control entity does not instruct the multiplexing and assembly procedure to generate a beam failure recovery media access control control element or a shortened beam failure recovery media access control control element before candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within the evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal in the secondary cell.

[0216] In some aspects, if at least one beam failure recovery has been triggered and not canceled in the beam failure recovery procedure, and candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed for at least one cell, or a candidate beam identifier for at least one cell has been received from a lower layer, the medium access control entity instructs the multiplexing and assembly procedure to generate a beam failure recovery medium access control control element or a shortened beam failure recovery medium access control control element based on the uplink resources, or triggers a scheduling request.

[0217] In some aspects, if beam failure recovery has been triggered and not canceled in at least one secondary cell in the beam failure recovery procedure, and candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed in at least one cell, or a candidate beam identifier for at least one cell has been received from a lower layer, the medium access control entity instructs the multiplexing and assembly procedure to generate a beam failure recovery medium access control control element or a shortened beam failure recovery medium access control control element based on the uplink resources, or triggers a scheduling request.

[0218] 9 is a schematic diagram of another example of a beam failure information reporting device 900 according to an embodiment of the present invention. As shown in FIG. 9, the beam failure information reporting device 900 includes the following components:

[0219] The detector 901 detects that a beam failure has occurred in a secondary cell.

[0220] The processing unit 902 does not report that a beam failure has occurred in the secondary cell before candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within the evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal in the secondary cell, and / or does not instruct the multiplexing and assembly procedure to generate a beam failure recovery medium access control control element or a shortened beam failure recovery medium access control control element.

[0221] In some aspects, if beam failure recovery has been triggered in multiple cells and candidate beam detection has been completed in at least one cell, the processing unit 902 does not report that beam failure has occurred in the secondary cell.

[0222] If beam failure recovery has been triggered in multiple cells and candidate beam detection has not been completed in all cells for which beam failure recovery has been triggered, the processing unit 902 does not instruct the multiplexing and assembly procedure to generate a beam failure recovery medium access control control element or a shortened beam failure recovery medium access control control element.

[0223] The above-described embodiments are merely examples of the present invention, and the present invention is not limited thereto. Appropriate modifications can be made based on the above-described embodiments. For example, each of the above-described embodiments can be used alone, or one or more of the above-described embodiments can be used in combination.

[0224] Although the above description only describes components or modules related to the present invention, the present invention is not limited thereto. The beam failure information reporting devices 800 and 900 may further include other components or modules. For specific details of these components or modules, please refer to the related art.

[0225] 8 and 9 only exemplify the connection relationships or signal directions between various components or modules, but it will be apparent to those skilled in the art that various related technologies such as bus connections can be used. The various components or modules described above may be implemented by hardware devices such as a processor, a memory, a transmitter, and a receiver, and the present invention is not limited thereto.

[0226] According to this embodiment, when the terminal device completes candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) in a secondary cell where a beam failure has occurred, the terminal device reports to the network device that a beam failure has occurred in the secondary cell, or reports to the network device a medium access control (MAC) protocol data unit (PDU) including beam failure information of the secondary cell. This prevents the network device from configuring an inappropriate beam for the terminal device, thereby reducing or avoiding the inability to recover from the beam failure.

[0227] Example 6 The embodiment of the present invention further provides a communication system, and you may refer to FIG. 1, and the description of the same contents as the first to fifth embodiments will be omitted.

[0228] In some embodiments, communication system 100 may include terminal devices 102 and network devices 101 .

[0229] The terminal device 102 determines that candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) has been completed in a secondary cell in which a beam failure has occurred, and reports that a beam failure has occurred in the secondary cell, or reports a medium access control (MAC) protocol data unit (PDU) including beam failure information of the secondary cell.

[0230] The network device 101 receives a medium access control (MAC) protocol data unit (PDU) including report information that a beam failure has occurred in a secondary cell or beam failure information of a secondary cell.

[0231] An embodiment of the present invention further provides a network device, which may be, for example, a base station, but the present invention is not limited thereto and may be other network devices.

[0232] Fig. 10 is a schematic diagram of a network device according to an embodiment of the present invention. As shown in Fig. 10, the network device 1000 may include a processor 1010 (e.g., a central processing unit (CPU)) and a memory 1020, which is connected to the processor 1010. The memory 1020 may store various data and may further store an information processing program 1030, which is executed under the control of the processor 1010.

[0233] 10, the network device 1000 may further include a transceiver 1040 and an antenna 1050. The functions of the above components are similar to those of the prior art, and a description thereof will be omitted here. The network device 1000 does not need to include all the units shown in FIG. 10. The network device 1000 may further include units not shown in FIG. 10, and may refer to the prior art.

[0234] The embodiment of the present invention further provides a terminal device, but the present invention is not limited thereto and may be other devices.

[0235] 11 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in FIG. 11, the terminal device 1100 may include a processor 1110 and a memory 1120, where the memory 1120 stores data and programs and is connected to the processor 1110. It should be noted that this diagram is illustrative and that other types of structures may be used to supplement or replace this structure to achieve communication or other functions.

[0236] For example, the processor 1110 may execute a program to realize the method for reporting beam failure information described in Example 1. For example, the processor 1110 may be configured to determine that candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) has been completed in a secondary cell in which a beam failure has occurred, and to report to a network device that a beam failure has occurred in the secondary cell.

[0237] For example, the processor 1110 may execute a program to realize the beam failure information reporting method described in Example 2. For example, the processor 1110 may be configured to determine that candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) has been completed in a secondary cell in which a beam failure has occurred, and report a medium access control (MAC) protocol data unit (PDU) including beam failure information of the secondary cell to a network device.

[0238] For example, the processor 1110 may execute a program to realize the beam failure information reporting method described in Example 3. For example, the processor 1110 may be configured to detect that a beam failure has occurred in a secondary cell, and not report that a beam failure has occurred in the secondary cell before candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within an evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal in the secondary cell, and / or not instruct a multiplexing and assembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE).

[0239] For example, the processor 1110 may execute a program to implement the beam failure information reporting method described in Example 4. For example, the processor 1110 may be configured to detect that a beam failure has occurred in a secondary cell and, if the secondary cell is configured in a medium access control (MAC) entity, report a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) for the medium access control entity.

[0240] 11, the terminal device 1100 may further include a communication module 1130, an input unit 1140, a display 1150, a power supply 1160, and the like. Here, the functions of the above units are similar to those of the prior art, and therefore, description thereof will be omitted here. Note that the terminal device 1100 does not need to include all of the units shown in FIG. 11. The terminal device 1100 may further include units not shown in FIG. 11, and prior art may be referred to.

[0241] In an embodiment of the present invention, a computer-readable program is further provided, which, when executed in a terminal device, causes the terminal device to execute the beam failure information reporting method described in embodiments 1 to 4.

[0242] An embodiment of the present invention further provides a storage medium having a computer-readable program stored therein, which, when executed, causes a terminal device to execute the beam fault information reporting method described in embodiments 1 to 4.

[0243] The above-described apparatus and method of the present invention may be realized by hardware or a combination of hardware and software. The present invention relates to a computer-readable program that, when executed by a logic unit, causes the logic unit to implement the above-described apparatus or components, or to implement the above-described various methods or steps. The present invention also relates to a storage medium for storing the above-described program, such as a hard disk, magnetic disk, optical disk, DVD, flash memory, etc.

[0244] Each processing method in each device described with reference to the embodiments of the present invention may be implemented by hardware, a software module executed by a processor, or a combination of both. For example, one or more of the functional block diagrams shown in the drawings, or one or more combinations of the functional block diagrams, may correspond to each software module in a computer program flow or each hardware module. These software modules may correspond to each step shown in the drawings. These hardware modules may be implemented by implementing these software modules in hardware, for example, using a field programmable gate array (FPGA).

[0245] The software module may be located in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, mobile hard disk, CD-ROM, or any other form of storage medium known to those skilled in the art. The storage medium may be connected to the processor so that the processor reads information from or writes information to the storage medium, or the storage medium may be a component of the processor. The processor and the storage medium may be located in an ASIC. The software module may be stored in the memory of the mobile terminal or in a memory card inserted into the mobile terminal. For example, if a device (e.g., a mobile terminal) uses a relatively large-capacity MEGA-SIM card or a large-capacity flash memory device, the software module may be stored in the MEGA-SIM card or the large-capacity flash memory device.

[0246] One or more of the functional blocks and / or one or more combinations of functional blocks in the functional block diagrams set forth in the figures may be implemented with 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 device, a discrete gate or transistor logic device, a discrete hardware component, or any suitable combination thereof to perform the functions described herein. One or more of the functional blocks and / or one or more combinations of functional blocks in the functional block diagrams set forth in the figures may be implemented with, for example, a combination of computing devices, such as a combination of a DSP and a microprocessor, a combination of multiple microprocessors, one or more microprocessors in combination with a DSP communication, or any other configuration.

[0247] Although the present invention has been described above with reference to specific embodiments, the above description is merely illustrative and does not limit the scope of protection of the present invention. Various modifications and changes may be made to the present invention without departing from the spirit and principles of the present invention, and these modifications and changes are also within the scope of the present invention.

[0248] Furthermore, the following supplementary notes are disclosed regarding the embodiments including the above-mentioned examples. (Appendix 1) A method for reporting beam failure information, comprising: A step in which a terminal device determines that candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) has been completed in a secondary cell in which a beam failure has occurred; and reporting to a network device that a beam failure has occurred in the secondary cell. (Appendix 2) The step of determining that candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) has been completed in a secondary cell in which a beam failure has occurred by the terminal device includes: A method as described in Supplementary Note 1, including a step of determining by a medium access control (MAC) entity of the terminal device that candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed in the secondary cell, and / or receiving a candidate beam identifier of the secondary cell from a lower layer by the medium access control (MAC) entity of the terminal device. (Appendix 3) A method as described in Supplementary Note 1 or 2, further comprising a step in which a medium access control (MAC) entity of the terminal device does not report that a beam failure has occurred in the secondary cell before candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within an evaluation period for candidate beam detection based on a synchronization signal block or a channel state information reference signal in the secondary cell. (Appendix 4) The method of claim 3, further comprising the step of generating a corresponding medium access control (MAC) control element (CE) or a shortened medium access control (MAC) control element (CE) and assembling a medium access control (MAC) protocol data unit (PDU) if the secondary cell has triggered beam failure recovery and the beam failure recovery has not been canceled. (Appendix 5) The method described in Supplementary Note 4, wherein the medium access control (MAC) entity does not report in the medium access control (MAC) control element (CE) or a shortened medium access control (MAC) control element (CE) that a beam failure has occurred in the secondary cell. (Appendix 6) The method described in Supplementary Note 5, wherein the medium access control (MAC) entity sets indication information (Ci field) corresponding to the secondary cell in the medium access control (MAC) control element (CE) or shortened medium access control (MAC) control element (CE) to 0 and does not include a field carrying candidate beam information corresponding to the secondary cell (AC field). (Appendix 7) The Medium Access Control (MAC) entity instructs the multiplexing and assembly procedure to generate a Beam Failure Recovery (BFR) Medium Access Control (MAC) Control Element (CE), and generates a Beam Failure Recovery (BFR) Medium Access Control (MAC) Control Element (CE) or a shortened Beam Failure Recovery (BFR) Medium Access Control (MAC) Control Element (CE) in the multiplexing and assembly procedure, or 7. The method of claim 5 or 6, wherein the medium access control (MAC) entity instructs a multiplexing and assembly procedure to generate an abbreviated beam failure recovery (BFR) medium access control (MAC) control element (CE), and in the multiplexing and assembly procedure, generates a beam failure recovery (BFR) medium access control (MAC) control element (CE) or an abbreviated beam failure recovery (BFR) medium access control (MAC) control element (CE). (Appendix 8) 7. The method of claim 5 or 6, wherein the medium access control (MAC) entity instructs the multiplexing and assembly procedure to generate a medium access control (MAC) control element (CE) carrying beam failure and recovery information of the secondary cell, and generates a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) in the multiplexing and assembly procedure. (Appendix 9) 9. The method of claim 8, wherein the multiplexing and assembly procedure determines whether to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE). (Appendix 10) The Medium Access Control (MAC) entity instructs the multiplexing and assembly procedure to generate a Beam Failure Recovery (BFR) Medium Access Control (MAC) Control Element (CE), and the multiplexing and assembly procedure generates the Beam Failure Recovery (BFR) Medium Access Control (MAC) Control Element (CE) upon receiving the instruction of the Medium Access Control (MAC) entity, or 7. The method of claim 5 or 6, wherein the medium access control (MAC) entity instructs a multiplexing and assembly procedure to generate an abbreviated beam failure recovery (BFR) medium access control (MAC) control element (CE), and the multiplexing and assembly procedure generates the abbreviated beam failure recovery (BFR) medium access control (MAC) control element (CE) upon receiving an instruction from the medium access control (MAC) entity. (Appendix 11) The method of any of Supplementary Notes 5 to 10, further comprising the step of: the terminal device using a beam failure recovery (BFR) medium access control (MAC) control element (CE) of a first format when the highest serving cell index for which indication information (Ci field) corresponding to a secondary cell in a medium access control (MAC) entity is set to 1 is less than 8, and using a beam failure recovery (BFR) medium access control (MAC) control element (CE) of a second format when the highest serving cell index for which indication information (Ci field) is set to 1 is 8 or greater. (Appendix 12) 11. The method of any of Supplementary Notes 5 to 10, wherein the terminal device uses a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) of a first format if the highest serving cell index in which indication information (Ci field) corresponding to a secondary cell in a medium access control (MAC) entity is set to 1 is less than 8, or if a beam failure is detected in a special cell and the special cell is included in a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), and uplink resources cannot accommodate a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) of a second format, and otherwise uses a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) of a second format. (Appendix 13) A method for reporting beam failure information, comprising: A step in which a terminal device determines that candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) has been completed in a secondary cell in which a beam failure has occurred; and reporting a medium access control (MAC) protocol data unit (PDU) including beam failure information of the secondary cell to a network device. (Appendix 14) The step of determining that candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) has been completed in a secondary cell in which a beam failure has occurred by the terminal device includes: A method as described in Supplementary Note 13, comprising a step of determining by a medium access control (MAC) entity of the terminal device that candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed in the secondary cell, and / or receiving a candidate beam identifier of the secondary cell from a lower layer by the medium access control (MAC) entity of the terminal device. (Appendix 15) A method as described in Supplementary Note 13 or 14, further comprising a step in which the medium access control (MAC) entity of the terminal device does not instruct the multiplexing and assembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) before candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within an evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal in the secondary cell. (Appendix 16) The step of the medium access control (MAC) entity of the terminal device not instructing that the multiplexing and reassembly procedure generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) is performed, 16. The method of claim 15, comprising the step of: if the secondary cell has triggered and not cancelled beam failure recovery, there are available uplink resources, and the uplink resources can accommodate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE), the medium access control (MAC) entity not instructing the multiplexing and reassembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE). (Appendix 17) The method of Supplementary Note 15, further comprising the step of: when at least one beam failure recovery has been triggered and not canceled, and candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed in at least one cell, or a candidate beam identifier for at least one cell has been received from a lower layer, the medium access control (MAC) entity instructing the multiplexing and assembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) based on uplink resources, or triggering a scheduling request (SR). (Appendix 18) The method of Supplementary Note 15, further comprising the step of: when beam failure recovery has been triggered and not canceled in at least one secondary cell, and candidate beam detection based on a synchronization signal block or a channel state information reference signal has been completed in at least one cell, or a candidate beam identifier for at least one cell has been received from a lower layer, the medium access control (MAC) entity instructing the multiplexing and assembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) based on uplink resources, or triggering a scheduling request (SR). (Appendix 19) A method according to any one of Supplementary Notes 3 to 18, further comprising a step in which, when the terminal device transmits a Medium Access Control (MAC) Protocol Data Unit (PDU) including beam failure information of a secondary cell, the terminal device does not cancel beam failure recovery triggered in the secondary cell before assembling the Medium Access Control (MAC) Protocol Data Unit (PDU). (Appendix 20) 20. A method as claimed in any one of Supplementary Notes 1 to 19, further comprising the step of: generating, by a medium access control (MAC) entity of the terminal device, a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) for the medium access control entity if the secondary cell is configured in the medium access control (MAC) entity. (Appendix 21) The indication information (Ci field) of the beam failure recovery (BFR) medium access control (MAC) control element (CE) is set to 1, which indicates that a beam failure has been detected in a secondary cell with a serving cell index i configured in the medium access control (MAC) entity, and candidate beam information is included; The method described in Supplementary Note 20, wherein the indication information (Ci field) of the beam failure recovery (BFR) medium access control (MAC) control element (CE) is set to 0, indicating that a secondary cell with serving cell index i is not configured in the medium access control (MAC) entity, or that beam failure has not been detected in the secondary cell, and candidate beam information is not included. (Appendix 22) The indication information (Ci field) of the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) is set to 1, indicating that a beam failure has been detected in a secondary cell with a serving cell index i configured in the medium access control (MAC) entity and candidate beam information is included; The method described in Supplementary Note 20, wherein the indication information (Ci field) of the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) is set to 0, indicating that a secondary cell with serving cell index i is not configured in the medium access control (MAC) entity, or that no beam failure has been detected in the secondary cell, and no candidate beam information is included. (Appendix 23) A method for reporting beam failure information, comprising: A step of detecting that a beam failure has occurred in a secondary cell by a terminal device; A method comprising the steps of: the terminal device not reporting that a beam failure has occurred in the secondary cell before candidate beam detection based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within an evaluation period of candidate beam detection based on a synchronization signal block or a channel state information reference signal in the secondary cell, and / or not instructing the multiplexing and assembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE). (Appendix 24) When beam failure recovery is triggered in multiple cells and candidate beam detection is completed in at least one cell, the terminal device does not report that beam failure has occurred in the secondary cell; The method described in Supplementary Note 23, further comprising a step in which, if beam failure recovery is triggered in multiple cells and candidate beam detection is not completed in all cells in which beam failure recovery is triggered, the terminal device does not instruct the multiplexing and assembly procedure to generate a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE). (Appendix 25) A method for reporting beam failure information, comprising: A step of detecting that a beam failure has occurred in a secondary cell by a terminal device; and reporting a beam failure recovery (BFR) medium access control (MAC) control element (CE) or a shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) for the medium access control entity if the secondary cell is configured in the medium access control (MAC) entity. (Appendix 26) The indication information (Ci field) of the beam failure recovery (BFR) medium access control (MAC) control element (CE) is set to 1, which indicates that a beam failure has been detected in a secondary cell with a serving cell index i configured in the medium access control (MAC) entity, and candidate beam information is included; The method described in Supplementary Note 25, wherein the indication information (Ci field) of the beam failure recovery (BFR) medium access control (MAC) control element (CE) is set to 0, indicating that a secondary cell with serving cell index i is not configured in the medium access control (MAC) entity, or that beam failure has not been detected in the secondary cell, and candidate beam information is not included. (Appendix 27) The indication information (Ci field) of the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) is set to 1, indicating that a beam failure has been detected in a secondary cell with a serving cell index i configured in the medium access control (MAC) entity and candidate beam information is included; The method described in Supplementary Note 25, wherein the indication information (Ci field) of the shortened beam failure recovery (BFR) medium access control (MAC) control element (CE) is set to 0, indicating that a secondary cell with serving cell index i is not configured in the medium access control (MAC) entity, or that no beam failure has been detected in the secondary cell, and no candidate beam information is included. (Appendix 28) A terminal device including a memory having a computer program stored therein and a processor, wherein the processor is configured to execute the computer program to realize a method for reporting beam failure information described in any one of Supplementary Notes 1 to 27. (Appendix 29) A communication system including a terminal device and a network device, The terminal device determines that candidate beam detection based on a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) has been completed in a secondary cell in which a beam failure has occurred, and reports that a beam failure has occurred in the secondary cell, or reports a medium access control (MAC) protocol data unit (PDU) including beam failure information of the secondary cell; A communication system in which the network device receives a medium access control (MAC) protocol data unit (PDU) including report information that a beam failure has occurred in the secondary cell or beam failure information of the secondary cell.

Claims

1. A beam failure information reporting device, a processor for detecting candidate beams; a transmitter for reporting beam failure in a secondary cell for which candidate beam evaluation based on a synchronization signal block or a channel state information reference signal has been completed; If beam failure is detected and the highest serving cell index for which candidate beam evaluation has been completed is less than 8, use a beam failure recovery medium access control control element of a first format, and if beam failure is detected and the highest serving cell index for which candidate beam evaluation has been completed is 8 or greater, use a beam failure recovery medium access control control element of a second format; The first format includes one octet containing a Ci field; The second format includes four octets including a Ci field.

2. The apparatus of claim 1, wherein the transmitter determines, via a medium access control entity, that candidate beam evaluation based on a synchronization signal block or a channel state information reference signal has been completed in the secondary cell, and / or receives a candidate beam identifier for the secondary cell from a lower layer via the medium access control entity.

3. Before candidate beam evaluation based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, The processor generates a corresponding medium access control control element or a shortened medium access control control element and assembles a medium access control protocol data unit when the secondary cell has triggered beam failure recovery and the beam failure recovery has not been canceled, and the medium access control entity does not report that a beam failure has occurred in the secondary cell in the medium access control control element or the shortened medium access control control element; The device of claim 1, wherein the medium access control entity sets the indication information corresponding to the secondary cell in the medium access control control element or the shortened medium access control control element to 0 and does not include a field carrying candidate beam information corresponding to the secondary cell.

4. The apparatus of claim 1, wherein the transmitter does not report that a beam failure has occurred in the secondary cell by a medium access control entity before candidate beam evaluation based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within an evaluation period of candidate beam evaluation based on a synchronization signal block or a channel state information reference signal in the secondary cell.

5. the processor, if the secondary cell has triggered beam failure recovery and the beam failure recovery has not been canceled, generates a corresponding medium access control control element or a shortened medium access control control element and assembles a medium access control protocol data unit; The apparatus of claim 4 , wherein the medium access control entity does not report in the medium access control control element or a shortened medium access control control element that a beam failure has occurred in the secondary cell.

6. The device of claim 5, wherein the medium access control entity sets the indication information corresponding to the secondary cell in the medium access control control element or shortened medium access control control element to 0 and does not include a field carrying candidate beam information corresponding to the secondary cell.

7. The medium access control entity instructs the multiplexing and assembly procedure to generate a beam failure recovery medium access control element, and generates a beam failure recovery medium access control element or a shortened beam failure recovery medium access control element in the multiplexing and assembly procedure, or The apparatus of claim 5 , wherein the medium access control entity instructs a multiplexing and assembly procedure to generate a shortened beam failure recovery medium access control control element, and generates a beam failure recovery medium access control control element or a shortened beam failure recovery medium access control control element in the multiplexing and assembly procedure.

8. The medium access control entity instructs a multiplexing and assembly procedure to generate a medium access control control element carrying beam failure and recovery information of a secondary cell, and generates a beam failure recovery medium access control control element or a shortened beam failure recovery medium access control control element in the multiplexing and assembly procedure; The apparatus of claim 5 , wherein the multiplexing and assembling procedure determines whether to generate a beam failure recovery medium access control element or a shortened beam failure recovery medium access control element.

9. the medium access control entity instructs the multiplexing and assembly procedure to generate a beam failure recovery medium access control control element, and the multiplexing and assembly procedure generates the beam failure recovery medium access control control element upon receiving the instruction of the medium access control entity, or 6. The apparatus of claim 5, wherein the medium access control entity instructs a multiplexing and assembly procedure to generate a shortened beam failure recovery medium access control control element, and the multiplexing and assembly procedure generates the shortened beam failure recovery medium access control control element upon receiving an instruction from the medium access control entity.

10. 6. The apparatus of claim 5, wherein when the highest serving cell index for which the indication information corresponding to a secondary cell in the medium access control entity is set to 1 is smaller than 8, a beam failure recovery medium access control control element of a first format is used, and when the highest serving cell index for which the indication information is set to 1 is 8 or greater, a beam failure recovery medium access control control element of a second format is used.

11. 6. The apparatus of claim 5, wherein if the highest serving cell index in which indication information corresponding to a secondary cell in the medium access control entity is set to 1 is less than 8, or if a beam failure is detected in a special cell and the special cell is included in a shortened beam failure recovery medium access control control element, and uplink resources cannot accommodate a shortened beam failure recovery medium access control control element in the second format, the apparatus uses a shortened beam failure recovery medium access control control element in the first format, and otherwise uses a shortened beam failure recovery medium access control control element in the second format.

12. 2. The apparatus of claim 1, wherein when transmitting a medium access control protocol data unit including beam failure information of a secondary cell, the apparatus does not cancel beam failure recovery triggered in the secondary cell before assembling the medium access control protocol data unit.

13. 2. The apparatus of claim 1, wherein a medium access control entity generates a beam failure recovery medium access control control element or a shortened beam failure recovery medium access control control element for the medium access control entity if the secondary cell is configured in the medium access control entity.

14. The indication information of the beam failure recovery medium access control control element is set to 1, which indicates that a beam failure has been detected in a secondary cell of serving cell index i configured in the medium access control entity and candidate beam information is included; the indication information of the beam failure recovery medium access control control element is set to 0, which indicates that a secondary cell of serving cell index i is not configured in the medium access control entity, or that a beam failure has not been detected in the secondary cell and candidate beam information is not included; The apparatus of claim 13, wherein the indication information of the shortened beam failure recovery medium access control control element is set to 1, indicating that beam failure has been detected in a secondary cell of serving cell index i configured in the medium access control entity and candidate beam information is included, and the indication information of the shortened beam failure recovery medium access control control element is set to 0, indicating that a secondary cell of serving cell index i is not configured in the medium access control entity or that beam failure has not been detected in the secondary cell and candidate beam information is not included.

15. A beam failure information reporting device, a processor for detecting candidate beams; a transmitter that reports to a network device a medium access control protocol data unit including beam failure information in a secondary cell for which candidate beam evaluation based on a synchronization signal block or a channel state information reference signal has been completed; If beam failure is detected and the highest serving cell index for which candidate beam evaluation has been completed is less than 8, use a beam failure recovery medium access control control element of a first format, and if beam failure is detected and the highest serving cell index for which candidate beam evaluation has been completed is 8 or greater, use a beam failure recovery medium access control control element of a second format; The first format includes one octet containing a Ci field; The second format includes four octets including a Ci field.

16. The apparatus of claim 15, wherein the transmitter determines, via a medium access control entity, that candidate beam evaluation based on a synchronization signal block or a channel state information reference signal has been completed in the secondary cell, and / or receives a candidate beam identifier for the secondary cell from a lower layer via the medium access control entity.

17. The apparatus of claim 15, wherein the medium access control entity does not instruct the multiplexing and assembly procedure to generate a beam failure recovery medium access control control element or a shortened beam failure recovery medium access control control element before candidate beam evaluation based on a synchronization signal block or a channel state information reference signal is completed in the secondary cell, or before receiving a candidate beam identifier for the secondary cell from a lower layer, or within the evaluation period of candidate beam evaluation based on a synchronization signal block or a channel state information reference signal in the secondary cell.

18. 18. The apparatus of claim 17, wherein if at least one beam failure recovery has been triggered and not canceled, and candidate beam evaluation based on a synchronization signal block or a channel state information reference signal has been completed in at least one cell, or a candidate beam identifier for at least one cell has been received from a lower layer, the medium access control entity instructs the multiplexing and assembly procedure to generate a beam failure recovery medium access control control element or a shortened beam failure recovery medium access control control element based on uplink resources, or triggers a scheduling request.

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