User device and beam obstacle report method used for beam obstacle reports

Abstract

To provide a UE for beam failure detection.SOLUTION: A UE includes a radio frequency (RF) signal processing device. The RF signal processing device receives a first candidate-beam reference-signal (RS) list and a second candidate-beam RS list and reports beam failure information. The first candidate-beam RS list is associated with a first beam-failure-detection RS (BFD-RS) set and the second candidate-beam RS list is associated with a second BFD-RS set. The beam failure information includes at least one of following: at least one component carrier (CC) index, at least one new candidate beam, an identity of BFD-RS set, or a CORESETPoolIndex.SELECTED DRAWING: Figure 16

Description

Technical Field

[0001] The present invention relates to beam failure reporting technology, and more particularly to beam failure reporting technology used in multiple transmit and receive point (TRP) operations.

Background Art

[0002] Under the current 3rd-Generation Partnership Project (3GPP) (registered trademark) specifications for New Radio (NR) mobile communications, when the serving beam is not available, a user equipment (UE) can select another beam from a list of candidate beams. This operation is related to beam failure detection and beam failure recovery (BFR).

[0003] However, when the BFR procedure is applied to multi-transmit and receive point (multi-TRP) operations, if a failure occurs in the control beam of one TRP, the BFR procedure may not be triggered. That is, in multi-TRP operations, the BFR procedure is triggered only when failures occur in all control beams of all TRPs. Therefore, the UE may fail to detect the downlink control information (DCI) from the disconnected TRP.

Summary of the Invention

Problems to be Solved by the Invention

[0004] To solve the above problems, a user equipment (UE) and a beam failure reporting method used for beam failure reporting are provided.

Means for Solving the Problems

[0005] Embodiments of the present invention provide a user equipment (UE) for use in beam obstruction reporting. The UE includes a radio frequency (RF) signal processing device. The RF signal processing device receives a first candidate beam reference signal (RS) list and a second candidate beam RS list, and reports beam obstruction information. The first candidate beam RS list is associated with a first beam failure detection RS (BFD-RS) set, and the second candidate beam RS list is associated with a second BFD-RS set. The beam obstruction information includes at least one of at least one component carrier (CC) index, at least one new candidate beam, the identity of the BFD-RS set, or a CORESETPoolIndex.

[0006] In some embodiments, when a beam obstruction is associated with the first BFD-RS set, a processor of the UE performs measurements of the RSs in the second candidate beam RS list associated with the second BFD-RS set to find candidate beam RSs for use in beam obstruction reporting.

[0007] In some embodiments, when a beam obstruction is associated with the first BFD-RS set, a processor of the UE performs measurements of the RSs in the first candidate beam RS list associated with the first BFD-RS set and in the second candidate beam RS list associated with the second BFD-RS set to find candidate beam RSs for use in beam obstruction reporting.

[0008] In some embodiments, when a beam obstruction is associated with the first BFD-RS set, a processor of the UE performs measurements of the RSs in all candidate beam RS lists to find candidate beam RSs for use in beam obstruction reporting.

[0009] In some embodiments, when a beam failure is associated with a first set of BFD-RSs, the UE's processor performs measurements of the RSs in the first candidate beam RS list associated with the first set of BFD-RSs to find candidate beam RSs for use in a beam failure report.

[0010] In some embodiments, when a beam failure is associated with a first set of BFD-RSs, the UE's processor performs measurements of the RSs in all candidate beam RS lists except for the second candidate beam RS list associated with the second set of BFD-RSs to find a candidate beam RS for use in a beam failure report.

[0011] In some embodiments, when a beam failure is associated with a first set of BFD-RSs, the UE's processor performs measurements of the RSs in the first candidate beam RS list associated with the first set of BFD-RSs to find the first candidate beam RS and performs measurements of the RSs in the second candidate beam RS list associated with the second set of BFD-RSs to find the second candidate beam RS. The first candidate beam RS and the second candidate beam RS are received by the UE simultaneously.

[0012] In some embodiments, when a beam failure is associated with a first set of BFD-RSs, the UE's processor performs measurements of the RSs in all candidate beam RS lists to find the first candidate beam RS and the second candidate beam RS for use in a beam failure report. The first candidate beam RS and the second candidate beam RS are received by the UE simultaneously.

[0013] In some embodiments, each candidate beam RS list is associated with a different set of BFD-RSs.

[0014] In some embodiments, the candidate beam RS list includes all RSs associated with all sets of BFD-RSs.

[0015] In some embodiments, the RF signal processing device transmits a first scheduling request for use in beam failure recovery (BFR). The first scheduling request is associated with a first set of BFD-RS. In one embodiment, when a beam failure is associated with a second set of BFD-RS, the RF signal processing device transmits a first physical uplink control channel (PUCCH) resource corresponding to the first scheduling request. In another embodiment, when a beam failure is associated with the first set of BFD-RS, the RF signal processing device transmits a first physical uplink control channel (PUCCH) resource corresponding to the first scheduling request.

[0016] In some embodiments, the UE's processor determines whether to transmit a physical uplink shared channel (PUSCH) resource used to accommodate a media access control channel control element (MAC CE) for reporting information regarding beam failure recovery (BFR). If the PUSCH resources available for new transmission are associated with a first set of BFD-RS for which no beam failure has been declared, the processor determines to transmit a PUSCH resource used to accommodate a MAC CE for reporting information regarding BFR. If the PUSCH resources available for new transmission are associated with a second set of BFD-RS for which a beam failure has been declared, the processor determines not to transmit a PUSCH resource used to accommodate a MAC CE for reporting information regarding BFR.

[0017] In some embodiments, the UE's processor assumes that at least one DM-RS port of the PDSCH is associated with a set of BFD-RS for which no beam failure has been declared.

[0018] Embodiments of the present invention also provide a beam failure reporting method. The beam failure reporting method is applied to a user equipment (UE). The beam failure reporting method includes using a radio frequency (RF) signal processing device of the UE to receive a first candidate beam reference signal (RS) list and a second candidate beam RS list, where the first candidate beam RS list is associated with a first beam failure detection RS (BFD-RS) set, and the second candidate beam RS list is associated with a second BFD-RS set, and using the RF signal processing device to report beam failure information, where the beam failure information includes at least one of at least one component carrier (CC) index, at least one new candidate beam, the identity of the BFD-RS set, or the CORESETPoolIndex.

[0019] Upon reading the following description of specific embodiments of the UE and the beam failure reporting method used for beam failure reporting, those skilled in the art will become aware of other aspects and features of the present invention.

Advantages of the Invention

[0020] According to the present invention, a user equipment (UE) and a beam failure reporting method used for beam failure reporting can be provided.

Brief Description of the Drawings

[0021] By reading the following detailed description with reference to the accompanying drawings, the present invention can be more fully understood.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5A

Figure 5B

Figure 5C

Figure 6

Figure 7

Figure 8A

Figure 8B

Figure 9A

Figure 9B

Figure 9C

Figure 9D

Figure 9E

Figure 9F

Figure 9G

Figure 10

Figure 11

Figure 12

Figure 13A

Figure 13B

Figure 14A

Figure 14B

Figure 15

Figure 16

Best Mode for Carrying Out the Invention

[0022] The following description is the best mode for carrying out the present invention. This description is made for the purpose of explaining the basic principles of the present invention and should not be construed in a limiting sense. The scope of the present invention should be determined with reference to the appended claims.

[0023] In an embodiment of the present invention, the beam obstacle detection reference signal (BFD-RS) in the present invention may be a channel state information-reference signal (CSI-RS), a synchronization signal block (SSB), a demodulation reference signal (DMRS), or a sound reference signal (SRS), but the present invention is not limited thereto.

[0024] In an embodiment of the present invention, the index or identity in the present invention may be a CORESETPoolIndex, a TRP_ID, a candidate beam RS list ID, a Panel ID, a group / set ID, or a group / set index, but the present invention is not limited thereto.

[0025] In an embodiment of the present invention, at least one of the following information used for multi-transmission / reception point (TRP) operations may be set in the UE110. The information includes a set of CORESETPoolIndexes, a set of TRPs, a set of candidate beam RS lists, and a set of panels, but the present invention is not limited thereto.

[0026] In an embodiment of the present invention, the base station in the present invention may be a next generation Node B (gNodeB), a cell, a serving cell, a TRP, a panel, an unlicensed cell, an unlicensed serving cell, an unlicensed TRP, or an evolved NodeB (eNodeB), but the present invention is not limited thereto.

[0027] In an embodiment of the present invention, the UE declares that a beam obstruction at the TRP means that the UE can trigger a beam obstruction recovery (BFR) procedure related to the TRP, or the UE can initiate a random process BFR related to the TRP, but the present invention is not limited thereto.

[0028] FIG. 1 is a block diagram of a user equipment (UE) 110 according to an embodiment of the present invention. As shown in FIG. 1, the UE 110 may include at least a baseband signal processing device 111, a radio frequency (RF) signal processing device 112, a processor 113, a storage device 114, and an antenna module including at least one antenna. Note that, for clarity of the inventive concept, FIG. 1 represents a simplified block diagram showing only the components related to the present invention, and the present invention is not limited to what is shown in FIG. 1.

[0029] In an embodiment of the present invention, the UE 110 may be a smartphone, a personal data assistant (PDA), a pager, a laptop computer, a desktop computer, a wireless handset, or any computing device including a wireless communication interface.

[0030] The RF signal processing device 112 receives RF signals via an antenna, processes the received RF signals, and converts them into baseband signals to be processed by the baseband signal processing device 111, or receives baseband signals from the baseband signal processing device 111 and converts the received baseband signals into RF signals to be transmitted to a peer communications apparatus. The RF signal processing device 112 may include a plurality of hardware components for performing radio frequency conversion. For example, the RF signal processing device 112 may include a power amplifier, a mixer, an analog-to-digital converter (ADC) / digital-to-analog converter (DAC), etc.

[0031] The baseband signal processing device 111 can further process the baseband signals to obtain information or data to be transmitted by the peer communications apparatus. The baseband signal processing device 111 may also include a plurality of hardware components for performing baseband signal processing.

[0032] The processor 113 can control the operations of the baseband signal processing device 111 and the RF signal processing device 112. According to an embodiment of the present invention, the processor 113 may be configured to execute program code of a software module (or software modules) of the corresponding baseband signal processing device 111 and / or RF signal processing device 112. Program code accompanied by specific data in a data structure can also be referred to as a processor logic unit or a stack instance when it is being executed. Thus, the processor 113 can be regarded as being composed of a plurality of processor logic units, each of which executes one or more specific functions or tasks of the corresponding software module (or software modules).

[0033] The memory device 114 can store the software and firmware program codes, system data, user data, etc. of the UE 110. The memory device 114 may be a volatile memory such as a random access memory (RAM), a non-volatile memory such as a flash memory or a read-only memory (ROM), a hard disk, or any combination thereof.

[0034] According to an embodiment of the present invention, the RF signal processing device 112 and the baseband signal processing device 111 can be regarded as a wireless module capable of communicating with a wireless network that provides a wireless communication service according to a predetermined radio access technology (RAT). Note that in some embodiments of the present invention, the UE 110 may be further extended to include a plurality of antennas and / or a plurality of wireless modules, and the present invention is not limited to that shown in FIG. 1.

[0035] FIG. 2 is a schematic diagram of a wireless communication system 200 according to an embodiment of the present invention. The wireless communication system 200 can be applied to a multi-transmit / receive point (TRP) operation. As shown in FIG. 2, the wireless communication system 200 may include a UE 110, a first transmit / receive point (TRP) 120, and a second TRP 130. The TRR 120 and the TRP 130 can communicate via a backhaul connection. Note that in order to clarify the inventive concept, a simplified block diagram is shown in FIG. 2. The present invention is not limited to that shown in FIG. 2. The wireless communication system 200 has more TRPs used for multi-TRP operations. Further, although the TRP 120 and the TRP 130 are used to explain the beam failure recovery (BFR) procedure (for example, the beam failure detection operation and the beam failure reporting operation) described below in the embodiments of the present invention, the present invention is not limited thereto. The BFR procedure described in the embodiments of the present invention may be applied to more TRPs.

[0036] FIG. 3 is a schematic diagram of the BFR procedure according to an embodiment of the present invention. UE 310 can be regarded as UE 110, and TRP 320 can be regarded as TRP 120 and TRP 130. As shown in FIG. 3, in step S310, for beam obstacle detection, TRP 320 can periodically transmit or configure a beam obstacle detection reference signal (BFD-RS) to UE 310.

[0037] In an embodiment of the present invention, a base station (e.g., TRP120 and TRP130) can set higher layer parameters (e.g., failureDetectionResources) for UE110. For each Bandwidth Part (BWP) of a serving cell, a set of periodic Channel state information-reference signal (CSI-RS) resources (i.e., BFD-RS) setting indexes may be set in the higher layer parameters (e.g., failureDetectionResources), and each of these CSI-RS resources (i.e., BFD-RS) may be associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto). Based on the index or identity of the BFD-RS, UE110 can know which TRP the BFD-RS is associated with. For example, BFD-RS#0 and BFD-RS#2 set by TRP120 may be associated with the TRP_ID TRP#0 corresponding to TRP120, and BFD-RS#1 and BFD-RS#3 set by TRP130 may be associated with another TRP_ID TRP#1 corresponding to TRP130. In this embodiment of the present disclosure, for each BWP, a maximum of two BFD-RS sets can be set, and for each BFD-RS set, a maximum of N resources (where N can be {1, 2}) can be set. Different BFD-RS sets may correspond to different TRPs or different CORESETpoolindexes.

[0038] In another embodiment, for the BWP of a serving cell, when the base station (e.g., TRP120 and TRP130) does not configure a set of BFD-RSs for the UE110 with upper layer parameters (e.g., failureDetectionResources or beamFailureDetectionResourcesList), the UE110 may determine at least one BFD-RS set based on the configured Control Resource Set (CORESET) information. The UE110 can classify the received BFD-RSs into different BFD-RS sets based on the configured CORESET information. The CORESET information may have the CORESETPoolIndex and / or the Transmission Configuration Indicator-state (TCI-state) configured. The CORESETPoolIndex can indicate which TRP the corresponding CORESET belongs to. The TCI state can indicate the corresponding RS index among the RSs of each CORESETs. For example, when CORESETPoolIndex#0 and / or TCI-state#0 are configured for CORESET#0, and RS#A0 is indicated by TCI-state#0 of the quasi co-located (QCL) type of spatial Rx parameter, and CORESETPoolIndex#1 and / or TCI-state#1 are configured for CORESET#1, and RS#A1 is indicated by TCI-state#1 of the quasi co-located (QCL) type of spatial Rx parameter, the UE110 can know that RS#A0 is associated with CORESET#0 and RS#A1 is associated with CORESET#1. Therefore, the UE110 can determine at least one BFD-RS set based on the relevance.In this embodiment, for each BFD-RS index having the same value as the RS index in the RS set indicated by the TCI state for each of the CORESETs, the same index or identity (e.g., CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto) may be set. For example, UE110 may determine BFD-RS set #0 for BFD of TRP120, where each RS in BFD-RS set #0 has the same spatial information as the RS set in the TCI state associated with the CORSET corresponding to CORESETPoolIndex #0 (or TRP #0). In other words, for the BWP of the serving cell, if UE110 is not provided with set q0 (e.g., a set of BFD-RSs) by failureDetectionResources or beamFailureDetectionResourceList, UE110 may determine set q0 that includes a periodic CSI-RS resource setting index having the same value as the RS index in the RS set indicated by the TCI state for each of the CORESETs used by the UE for PDCCH monitoring. Among these, if there are two RS indexes in the TCI state, the set includes the RS index having the QCL-TypeD setting used for the corresponding TCI state. In addition, UE110 can determine that each CSI-RS resource setting index is associated with an index or identity (e.g., CORESETPoolIndex, TRP ID, group / set ID, or group / set index, but the present invention is not limited thereto). Here, for each BFD-RS index having the same value as the RS index in the RS set indicated by the TCI state for each of the CORESETs, the same index or identity (e.g., CORESETPoolIndex, TRP ID, group / set ID, or group / set index, but the present invention is not limited thereto) may be set.Here, UE110 uses CORESETs for monitoring PDCCH.

[0039] In another embodiment of the present invention, a base station (e.g., TRP120 and TRP130) can set upper layer parameters (e.g., failureDetectionResources) for UE110. A set of periodic CSI-RS resource (i.e., BFD-RS) setting indexes can be set by the upper layer parameters (e.g., failureDetectionResources). However, in this embodiment, in the upper layer parameters (e.g., failureDetectionResources), each CSI-RS resource (i.e., BFD-RS) does not have to be associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto). Therefore, in this embodiment, UE110 can determine that each CSI-RS resource (i.e., BFD-RS) setting index is associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto). Here, the same index or identity (e.g., CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto) may be set for each of the BFD-RS indexes having the same value as the RS index in the RS set indicated by the TCI state associated with the CORESET. In other words, for each BWP of the serving cell, UE110 can be provided with a set q0 of periodic CSI-RS resource setting indexes (e.g., a set of BFD-RSs) by failureDetectionResources.When a higher layer parameter PDCCH-Config including at least one value of CORESETPoolIndex in a ControlResourceSet is configured for UE110, and / or when each CSI-RS resource is not associated with an index or identity (e.g., CORESETPoolIndex, TRP ID, group / set ID, or group / set index, but the present invention is not limited thereto), UE110 may determine that each CSI-RS resource configuration index is associated with an index or identity (e.g., CORESETPoolIndex, TRP ID, group / set ID, or group / set index, but the present invention is not limited thereto). Here, each BFD-RS index having the same value as the RS index in the RS set indicated by the TCI state for each CORESETs may be set with the same index or identity (e.g., CORESETPoolIndex, TRP ID, group / set ID, or group / set index, but the present invention is not limited thereto). Here, UE110 uses CORESETs for monitoring of PDCCH.

[0040] In another embodiment of the present invention, a base station (e.g., TRP120 and TRP130) can set upper layer parameters (e.g., failureDetectionResources) for UE110. An index or identity (e.g., CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto) may be set in the upper layer parameters (e.g., failureDetectionResources). Among these, each index or identity may be associated with at least one BFD-RS. For example, if BFD-RS#0 and BFD-RS#2 are set by TRP120 corresponding to TRP_ID TRP#0, and BFD-RS#1 and BFD-RS#3 are set by TRP130 corresponding to TRP_ID TRP#1, BFD-RS#0 and BFD-RS#2 may be set in a set associated with TRP_ID TRP#0, and BFD-RS#1 and BFD-RS#3 may be set in another set associated with another TRP_ID TRP#1. In an embodiment of the present invention, for UE110, a maximum of two BFD-RS sets may be set for each BWP, and a maximum of N resources (where N can be {1, 2}) may be set for each BFD-RS set. Different BFD-RS sets may correspond to different TRPs or different CORESETpoolindexes.

[0041] In an embodiment of the present invention, the physical layer in UE110 can estimate the quality of the radio link for each BFD-RS set. UE110 periodically monitors BFD-RS. When the quality of the radio link of the periodic BFD-RS is lower than a threshold, a beam failure instance (BFI) (or BFI indication) is detected in the lower layer (e.g., physical layer) of UE110, and UE110 can send the BFI indication to the upper layer (e.g., MAC layer) of UE110. In another embodiment, the BFI can be a BFD-RS set. Different BFI indications may correspond to different TRPs (e.g., TRP120 and TRP130) or different CORESET pool indexes. In an embodiment of the present invention, in TRP120, the first reporting period PTRP#0 of the first BFI indication BFITRP#0 from the lower layer (e.g., physical layer) of UE110 to the upper layer (e.g., MAC layer) of UE110 may be associated with the first set of BFD-RS (e.g., BFD-RS#0) corresponding to the first CORESET PoolIndex or TRP_ID (e.g., TRP#0). The first reporting period PTRP#0 can be defined as follows. PTRP#0 = Max{P0, T0 ms} where P0 may be defined as min[the period of the configured BFD-RS(s) associated with TRP120], and T0 is a fixed and configured time duration and can be. Also, in TRP130, the second reporting period PTRP#1 of the second BFI indication BFITRP#1 from the lower layer (e.g., physical layer) of UE110 to the upper layer (e.g., MAC layer) of UE110 may be associated with the second set of BFD-RS (e.g., BFD-RS#1) corresponding to the second CORESET PoolIndex or TRP_ID (e.g., TRP#1). The second reporting period PTRP#1 can be defined as follows. PTRP#1 = Max{P1, T1ms} Wherein, P1 may be min[the period of the configured BFD-RS(s) associated with TRP130], and T1 may be a fixed and configured time. FIG. 4 is a schematic diagram of a first reporting period PTRP#0 and a second reporting period PTRP#1 according to an embodiment of the present invention.

[0042] According to a first embodiment of the BFD procedure of the present invention, individual BFD timers for TRP120 and TRP130, respectively, may be set in UE110. When UE110 receives a corresponding first BFI indication BFITRP#0 from a lower layer (e.g., physical layer) to an upper layer (e.g., MAC layer), it may start or restart a first BFD timer TTRP,0. The first BFD timer TTRP,0 may be defined as follows. TTRP,0 = NTRP#0 * PTRP#0 Wherein, NTRP#0 may be an integer. When UE110 receives a corresponding second BFI indication BFITRP#1 from a lower layer (e.g., physical layer) to an upper layer (e.g., MAC layer), it may start or restart a second BFD timer TTRP,1. The second BFD timer TTRP,1 may be defined as follows. TTRP,1 = NTRP#1 * PTRP#1 Wherein, NTRP#1 may be an integer.

[0043] Furthermore, in the first embodiment of the present invention, UE110 can determine a BFI counter based on the number of reported first BFI indications BFITRP#0 and the number of reported second BFI indications BFITRP#1. The BFI counter in the first embodiment may be defined as follows. BFI counter = nBFI,0 * K + nBFI,1 Wherein, nBFI,0 is the number of reported first BFI indications BFITRP#0, nBFI,1 is the number of reported second BFI indications BFITRP#1, and K is a pre-defined or pre-set value of the counter step. When the following condition is satisfied, UE110 may declare that a beam failure has occurred at TRP120. Floor(BFI counter / K)≧Cmax,TRP0 Where Cmax,TRP0 is the first threshold for triggering beam failure recovery related to TRP120. The first threshold Cmax,TRP0 can be set by the base station (e.g., TRP120). When the following condition is satisfied, UE110 may declare that a beam failure has occurred at TRP130. Mod(BFI counter,K)≧Cmax,TRP1 Where Cmax,TRP1 is the second threshold for triggering beam failure recovery related to TRP130, and K is the above Cmax,TRP1. The second threshold Cmax,TRP1 can be set by the base station (e.g., TRP130). When the following condition is satisfied, UE110 may declare that both TRP120 and TRP130 are beam failures. Floor(BFI counter / K)*K+Mod(BFI counter,K)≧Cmax Where Cmax is the third threshold for triggering beam failure recovery related to TRP120 and TRP130. The third threshold Cmax can be set by the base station (e.g., TRP120 and / or TRP130).

[0044] Figure 5A is a schematic diagram of the declaration of beam obstacle occurrence in TRP120 according to the first embodiment of the BFD procedure of the present invention. In Figure 5A, it is assumed that the counter coefficient K = 10 and the first threshold Cmax,TRP0 = 3. In Figure 5A, the symbol "×" means that the quality of the radio link of BFD-RS is lower than the threshold (that is, the BFI indication is detected), and the symbol "v" means that the quality of the radio link of BFD-RS is better than the threshold (that is, the indication of the beam obstacle instance is not detected). As shown in Figure 5A, when the quality of the radio link of BFD-RS#0 is lower than the threshold at the first monitoring time point of the first reporting period PTRP#0, the first BFI indication BFITRP#0 is detected in the lower layer (for example, the physical layer) of UE110, and UE110 can send the first BFI indication BFITRP#0 to the upper layer (for example, the MAC layer) of UE110. When the upper layer (for example, the MAC layer) receives the first BFI indication BFITRP#0, UE110 starts the first BFD timer TTRP,0 and increases the value of the current BFI counter by 10 (that is, BFI counter = 1 * 10 + 0). When the first BFD timer TTRP,0 is enabled, the value of the first BFD timer TTRP,0 gradually returns to 0. When the quality of the radio link of BFD-RS#0 is lower than the threshold at the second monitoring time point of the first reporting period PTRP#0, the first BFI indication BFITRP#0 is detected again in the lower layer (for example, the physical layer) of UE110, and UE110 can send the first BFI indication BFITRP#0 to the upper layer (for example, the MAC layer) of UE110. When the upper layer (for example, the MAC layer) receives the first BFI indication BFITRP#0, UE110 restarts the first BFD timer TTRP,0 and increases the value of the current BFI counter by 10 (that is, BFI counter = 2 * 10 + 0). When the quality of the radio link of BFD-RS#0 is lower than the threshold at the third monitoring time point of the first reporting period PTRP#0, the first BFI indication BFITRP#0 is detected again in the lower layer (for example, the physical layer) of UE110, and UE110 can send the first BFI indication BFITRP#0 to the upper layer (for example, the MAC layer) of UE110.When the upper layer (e.g., MAC layer) receives the first BFI instruction BFITRP#0, UE110 restarts the first BFD timer TTRP,0 and increments the value of the current BFI counter by 10 (i.e., BFI counter = 3 * 10 + 0). Since the BFI counter = 30 satisfies the condition: Floor(BFI counter / K) ≧ Cmax, TRP0, UE110 declares that a beam failure has occurred at TRP120, i.e., TRP120. instead of the wireless link of BFD-RS#0 It will be necessary to declare that a new candidate beam needs to be found.

[0045] Figure 5B is a schematic diagram of the declaration of beam failure occurrence in TRP130 according to the first embodiment of the BFD procedure of the present invention. In Figure 5B, it is assumed that the counter coefficient K = 10 and the second threshold Cmax,TRP1 = 3. In Figure 5B, the symbol "×" means that the quality of the wireless link of BFD-RS is lower than the threshold (that is, the BFI indication is detected), and the symbol "v" means that the quality of the wireless link of BFD-RS is better than the threshold (that is, the indication of the beam failure instance is not detected). As shown in Figure 5B, when the quality of the wireless link of BFD-RS#1 is lower than the threshold at the first monitoring time point of the second reporting period PTRP#1, the second BFI indication BFITRP#1 is detected in the lower layer (for example, the physical layer) of UE110, and UE110 can send the second BFI indication BFITRP#1 to the upper layer (for example, the MAC layer) of UE110. When the upper layer (for example, the MAC layer) receives the second BFI indication BFITRP#1, UE110 starts the second BFD timer TTRP,1 and increments the value of the current BFI counter by 1 (that is, BFI counter = 0 * 10 + 1). When the second BFD timer TTRP,1 is enabled, the value of the second BFD timer TTRP,1 gradually returns to 0. When the quality of the wireless link of BFD-RS#1 is lower than the threshold at the second monitoring time point of the second reporting period PTRP#1, the second BFI indication BFITRP#1 is detected again in the lower layer (for example, the physical layer) of UE110, and UE110 can send the second BFI indication BFITRP#1 to the upper layer (for example, the MAC layer) of UE110. When the upper layer (for example, the MAC layer) receives the second BFI indication BFITRP#1, UE110 restarts the second BFD timer TTRP,1 and increments the value of the current BFI counter by 1 (that is, BFI counter = 0 * 10 + 2). When the quality of the wireless link of BFD-RS#1 is lower than the threshold at the third monitoring time point of the second reporting period PTRP#1, the second BFI indication BFITRP#1 is detected again in the lower layer (for example, the physical layer) of UE110, and UE110 can send the second BFI indication BFITRP#1 to the upper layer (for example, the MAC layer) of UE110.When the upper layer (e.g., MAC layer) receives the second BFI indication BFITRP#1, UE110 restarts the second BFD timer TTRP,1 and increments the value of the current BFI counter by 1 (i.e., BFI counter = 0*10 + 3). Since the BFI counter = 3 satisfies the condition: Mod(BFI counter, K) ≧ Cmax,TRP1, UE110 declares that a beam failure has occurred at TRP130, that is, TRP130. instead of the wireless link of BFD-RS#1 It will be necessary to declare that a new candidate beam needs to be found.

[0046] Figure 5C is a schematic diagram of the expiration of the first BFD timer TTRP,0 and the second BFD timer TTRP,1 according to the first embodiment of the BFD procedure of the present invention. In Figure 5C, it is assumed that the counter coefficient K = 10. In Figure 5C, the symbol "×" means that the quality of the wireless link of BFD-RS is lower than the threshold (that is, a BFI indication is detected), and the symbol "v" means that the quality of the wireless link of BFD-RS is better than the threshold (that is, an indication of a beam obstruction instance is not detected). In the first embodiment of the present invention, when the second BFD timer TTRP,1 expires, UE110 may set the BFI counter = Floor(BFI counter / K)*K. Further, when the first BFD timer TTRP,0 expires, UE110 may set the BFI counter -= Mod(BFI counter,K). As shown in Figure 5C, when the upper layer (for example, the MAC layer) receives the second BFI indication BFITRP#1, UE110 starts the second BFD timer TTRP,1 and increments the value of the current BFI counter by 1 (that is, BFI counter = 0*10 + 1). When the second BFD timer TTRP,1 is enabled, the value of the second BFD timer TTRP,1 gradually returns to 0. When the quality of the wireless link of BFD-RS#1 is lower than the threshold at the second monitoring time of the second reporting period PTRP#1, the second BFI indication BFITRP#1 is detected again in the lower layer (for example, the physical layer) of UE110, and UE110 may send the second BFI indication BFITRP#1 to the upper layer (for example, the MAC layer) of UE110. When the upper layer (for example, the MAC layer) receives the second BFI indication BFITRP#1, UE110 restarts the second BFD timer TTRP,1 and increments the value of the current BFI counter by 1 (that is, BFI counter = 0*10 + 2). Then, when the quality of the wireless link of BFD-RS#0 is lower than the threshold at the second monitoring time of the first reporting period PTRP#0, the first BFI indication BFITRP#0 is detected in the lower layer (for example, the physical layer) of UE110, and UE110 may send the first BFI indication BFITRP#0 to the upper layer (for example, the MAC layer) of UE110.When the upper layer (e.g., the MAC layer) receives the first BFI indication BFITRP#0, UE110 starts the first BFD timer TTRP,0 and increments the value of the current BFI counter by 10 (i.e., BFI counter = 1 * 10 + 2). When the second BFD timer TTRP,1 expires at time point T1, UE110 may set BFI counter = Floor(BFI counter / K) * K (i.e., at time point T1, the two-digit value of the BFI counter changes from 12 to 10). When the first BFD timer TTRP,0 expires at time point T2, UE110 may set BFI counter = Mod(BFI counter, K) (i.e., at time point T2, the two-digit value of the BFI counter changes from 10 to 00).

[0047] According to the second embodiment of the BFD procedure of the present invention, only one BFD timer is set for UE110. When UE110 receives the first BFI indication BFITRP#0 and / or the second BFI indication BFITRP#1 from the lower layer (e.g., the physical layer) to the upper layer (e.g., the MAC layer), it may update (or set, reset, start, restart) the BFD timer. When UE110 receives the first BFI indication BFITRP#0, UE110 can update the BFD timer as follows. BFD timer = T’TRP,0 * M + Mod(BFD timer, M) Wherein, T’TRP,0 may be the first time coefficient of BFD associated with TRP120, which is predefined or set in advance, and M may be the value of a predefined or set time step factor. In addition, T’TRP,0 may be equal to NTRP#0 * PTRP#0 (where NTRP#0 may be an integer). When UE110 receives the second BFI indication BFITRP#1, UE110 can update the BFD timer as follows. BFD timer = Floor(BFD timer / M) * M + T’TRP,1 Where T’TRP,1 may be a second time coefficient of the BFD associated with TRP130 that is predefined or preconfigured. Additionally, T’TRP,1 may be equal to NTRP#1*PTRP#1, where NTRP#1 can be an integer. For example, assume that the BFD timer has a 4-digit value (x1x0y1y0), the first time coefficient T’TRP,0 = 6, the second time coefficient T’TRP,1 = 3, and the timer step coefficient M = 100. When UE110 receives the first BFI indication BFITRP#0, UE110 can update the value of the BFD timer from (x1x0y1y0) to (06y1y0) according to the formula: BFD timer = T’TRP,0*M + Mod(BFD timer, M). When UE110 receives the second BFI indication BFITRP#1, UE110 can update the value of the BFD timer from (x1x0y1y0) to (x1x003) according to the formula: BFD timer = Floor(BFD timer / M)*M + T’TRP,1.

[0048] In the second embodiment of the present invention, UE110 can determine the BFD timer value based on the first countdown step coefficient STRP#0 after one first reporting period (or the first countdown period) PTRP#0. The BFD timer value can be determined based on the following conditions. If [Floor(BFD timer / M)-STRP#0]>0, BFD timer=[Floor(BFD timer / M)- STRP#0]*M+Mod(BFD timer,M), else BFD timer=Mod(BFD timer,M) In the formula, the first countdown step coefficient STRP#0 can be a countdown step coefficient associated with TRP120 that is predefined or set in advance. For example, assume that the BFD timer has a 4-digit value (x1x0y1y0), the first countdown step coefficient STRP#0 = 2, the first countdown period PTRP#0 = 2, and the time step coefficient M = 100, and the current value of the BFD timer is assumed to be (06y1y0). If the first BFI indication BFITRP#0 is not detected after the first countdown period PTRP#0 and [Floor(BFD timer / M) - STRP#0] > 0, the current value of the BFD timer will change from (06y1y0) to (04y1y0).

[0049] In addition, in the second embodiment of the present invention, after one second reporting period (or second countdown period) PTRP#1, UE110 can determine the BFD timer value based on the second countdown step coefficient STRP#1. The value of the BFD timer can be determined according to the following conditions. If [Mod(BFD timer,M) - STRP#1] > 0, BFD timer = Floor(BFD timer / M)] * M + [Mod(BFD timer,M) - STRP#1], else BFD timer = Floor(BFD timer / M)] * M, In the formula, the second countdown step coefficient STRP#1 can be a countdown step coefficient associated with TRP130 that is predefined or set in advance. For example, assume that the BFD timer has a 4-digit value (x1x0y1y0), the second countdown step coefficient STRP#1 = 1, the second countdown period PTRP#1 = 1, the time step coefficient M = 100, and the current value of the BFD timer is (x1x003). After the second countdown period PTRP#1, if the second BFI indication BFITRP#1 is not detected and [Mod(BFD timer, M) - STRP#1] > 0, the current value of the BFD timer will change from (x1x003) to (x1x002).

[0050] In the second embodiment of the present invention, the UE110 can determine a BFI counter based on the number of reported first BFI indications BFITRP#0 and the number of reported second BFI indications BFITRP#1. The definition and operation of the BFI counter are similar to those in the first embodiment. Therefore, they will not be elaborated again.

[0051] FIG. 6 is a schematic diagram of a BFD operation according to a second embodiment of the BFD procedure of the present invention. In FIG. 6, it is assumed that the time step coefficient M = 10, the first countdown step coefficient STRP#0 = 2, the second countdown step coefficient STRP#1 = 1, the first time coefficient T’TRP,0 = 6, the second time coefficient T’TRP,1 = 3, and the counter coefficient K = 10. In FIG. 6, the symbol "×" means that the quality of the wireless link of BFD-RS is lower than the threshold (that is, the BFI indication is detected), and the symbol "v" means that the quality of the wireless link of BFD-RS is better than the threshold (that is, the indication of the beam obstacle instance is not detected). In the second embodiment, when Mod(BFD timer, M) = 0, the UE110 may set BFI counter = Floor(BFI counter / K) * K. In addition, when Floor(BFD timer / M) = 0, the UE110 may set BFI counter = Mod(BFI counter, K). As shown in FIG. 6, when the upper layer (for example, the MAC layer) receives the second BFI indication BFITRP#1, the UE110 starts and updates the BFD timer based on BFD timer = Floor(BFD timer / M) * M + T’TRP,1 (that is, BFD timer = 3), and increments the value of the current BFI counter by 1 (that is, BFI counter = 0 * 10 + 1). When the quality of the wireless link of BFD-RS#1 is lower than the threshold at the second monitoring time point of the second reporting period PTRP#1, the second BFI indication BFITRP#1 is detected again in the lower layer (for example, the physical layer) of the UE110, and the UE110 may send the second BFI indication BFITRP#1 to the upper layer (for example, the MAC layer) of the UE110. When the upper layer (for example, the MAC layer) receives the second BFI indication BFITRP#1, the UE110 restarts and updates the BFD timer based on the formula: BFD timer = Floor(BFD timer / M) * M + T’TRP,1 (that is, BFD timer = 3), and increments the value of the current BFI counter by 1 (that is, BFI counter = 0 * 10 + 2).When the quality of the radio link of BFD-RS#1 is not lower than the threshold at the third monitoring time of the second reporting period PTRP#1, UE110 can update the BFD timer by reducing the BFD timer by only the second countdown step coefficient STRP#1 (that is, the BFD timer changes to 2).

[0052] When the quality of the radio link of BFD-RS#1 is not lower than the threshold at the fourth monitoring time of the second reporting period PTRP#1, but the quality of the radio link of BFD-RS#0 is lower than the threshold at the second monitoring time of the first reporting period PTRP#0, the first BFI indication BFITRP#0 is detected in the lower layer (for example, the physical layer) of UE110, and UE110 can send the first BFI indication BFITRP#0 to the upper layer (for example, the MAC layer) of UE110. When the upper layer (for example, the MAC layer) receives the first BFI indication BFITRP#0, UE110 can update the BFD timer by reducing the BFD timer by only the second countdown step coefficient STRP#1, and can update the BFD timer based on the formula: BFD timer = T’TRP,0*M + Mod(BFD timer, M) (that is, the BFD timer changes to 61), and UE110 can increase the value of the current BFI counter by 10 (that is, BFI conter = 1*10 + 2).

[0053] When the quality of the radio link of BFD-RS#1 is not lower than the threshold at the fifth monitoring time of the second reporting period PTRP#1, UE110 can update the BFD timer by reducing the BFD timer by only the second countdown step coefficient STRP#1 (that is, the two-digit value of the BFD timer changes from 61 to 60). In addition, since Mod(BFD timer, M) = 0 at the monitoring time (that is, time T1), UE110 can set BFI counter = Floor(BFIcounter / K)*K (that is, at time T1, the two-digit value of the BFD counter changes from 12 to 10).

[0054] When the first BFI indication BFITRP#0 and the second BFI indication BFITRP#1 are not detected in the lower layer (e.g., physical layer) of UE110 at the subsequent monitoring time points in the first reporting period PTRP#1 and the second reporting period PTRP#1, at each of the subsequent monitoring time points in the first reporting period PTRP#1, UE110 can update the BFD timer by decrementing the BFD timer by the first countdown step coefficient STRP#0 until the BFD timer returns to 0. When the BFD timer expires at time point T2, since Floor(BFD timer / M)=0, UE110 can set BFI counter = Mod(BFI counter, K) (that is, at time point T2, the two-digit value of the BFI counter changes from 10 to 00).

[0055] According to a third embodiment of the BFD procedure of the present invention, individual BFD timers for TRP120 and TRP130 may be set in UE110. When UE110 receives a corresponding first BFI indication BFITRP#0 from a lower layer (e.g., physical layer) to an upper layer (e.g., MAC layer), it can start or restart the first BFD timer TTRP,0, and when it receives a corresponding second BFI indication BFITRP#1 from the lower layer (e.g., physical layer) to the upper layer (e.g., MAC layer), it can start or restart the second BFD timer TTRP,1. The definition and operation of the first BFD timer and the second BFD timer are similar to those in the first embodiment. Therefore, they will not be elaborated again. In addition, in the third embodiment, individual BFI counters for TRP120 and TRP130 may be determined by UE110. UE110 can determine the first BFI counter of TRP120 based on the number of reported first BFI indications BFITRP#0 (i.e., the first BFI counter = nBFI,0), and can determine the second BFI counter of TRP130 based on the number of reported second BFI indications BFITRP#1 (i.e., the second BFI counter = nBFI,1). In the third embodiment, when the number of reported first BFI indications BFITRP#0 is greater than or equal to a first threshold Cmax,TRP0 (i.e., nBFI,0 ≥ Cmax,TRP0) (where Cmax,TRP0 is the first threshold for triggering beam failure recovery related to TRP120), UE110 may declare that a beam failure has occurred at TRP120. Further, when the number of reported second BFI indications BFITRP#1 is greater than or equal to a second threshold Cmax,TRP1 (i.e., nBFI,1 ≥ Cmax,TRP1) (where Cmax,TRP1 is the second threshold for triggering beam failure recovery related to TRP130), UE110 may declare that a beam failure has occurred at TRP130.Furthermore, if the number of reported first BFI indication BFITRP#0 is greater than or equal to the first threshold Cmax,TRP0, and the number of reported second BFI indication BFITRP#1 is greater than or equal to the second threshold Cmax,TRP1 (i.e., nBFI,0 ≧ Cmax and nBFI,1 ≧ Cmax), the UE 110 may declare that beam blockage has occurred at both TRP 120 and TRP 130.

[0056] Figure 7 is a schematic diagram of beam obstruction of TRP120 and TRP130 according to a third embodiment of the BFD procedure of the present invention. In Figure 7, it is assumed that the first threshold Cmax,TRP0 = 3 and the second threshold Cmax,TRP1 = 3. In Figure 7, the symbol "×" means that the quality of the radio link of BFD-RS is lower than the threshold (that is, a BFI indication is detected), and the symbol "v" means that the quality of the radio link of BFD-RS is better than the threshold (that is, an indication of a beam obstruction instance is not detected). As shown in Figure 7, at the first monitoring time of the first reporting period PTRP#0, when the quality of the radio link of BFD-RS#0 is lower than the threshold, the first BFI indication BFITRP#0 is detected in the lower layer (for example, the physical layer) of UE110, and UE110 can send the first BFI indication BFITRP#0 to the upper layer (for example, the MAC layer) of UE110. When the upper layer (for example, the MAC layer) receives the first BFI indication BFITRP#0, UE110 starts the first BFD timer TTRP,0 and increments the value of the current first BFI counter by 1 (that is, the first BFI counter = 1). At the second monitoring time of the first reporting period PTRP#0, when the quality of the radio link of BFD-RS#0 is lower than the threshold, the first BFI indication BFITRP#0 is detected again in the lower layer (for example, the physical layer) of UE110, and UE110 can send the first BFI indication BFITRP#0 to the upper layer (for example, the MAC layer) of UE110. When the upper layer (for example, the MAC layer) receives the first BFI indication BFITRP#0, UE110 restarts the first BFD timer TTRP,0 and increments the value of the current first BFI counter by 1 (that is, the first BFI counter = 2). At the third monitoring time of the first reporting period PTRP#0, when the quality of the radio link of BFD-RS#0 is lower than the threshold, the first BFI indication BFITRP#0 is detected again in the lower layer (for example, the physical layer) of UE110, and UE110 can send the first BFI indication BFITRP#0 to the upper layer (for example, the MAC layer) of UE110.When the upper layer (e.g., the MAC layer) receives the first BFI instruction BFITRP#0, UE110 restarts the first BFD timer TTRP,0 and increments the value of the current first BFI counter by 1 (i.e., BFI counter = 3). Since the first BFI counter = 3 satisfies the condition: nBFI,0 ≧ Cmax,TRP0, UE110 declares that a beam failure has occurred at TRP120, i.e., TRP120. instead of the wireless link of BFD-RS#0 It will be necessary to declare that a new candidate beam needs to be found.

[0057] Furthermore, as shown in FIG. 7, when the quality of the radio link of BFD-RS#1 is lower than the threshold at the first monitoring time of the second reporting period PTRP#1, the second BFI indication BFITRP#1 is detected in the lower layer (e.g., physical layer) of UE110, and UE110 can send the second BFI indication BFITRP#1 to the upper layer (e.g., MAC layer) of UE110. When the upper layer (e.g., MAC layer) receives the second BFI indication BFITRP#1, UE110 starts the second BFD timer TTRP,1 and increments the value of the current second BFI counter by 1 (i.e., the second BFI counter = 1). When the quality of the radio link of BFD-RS#1 is lower than the threshold at the second monitoring time of the second reporting period PTRP#1, the second BFI indication BFITRP#1 is detected again in the lower layer (e.g., physical layer) of UE110, and UE110 can send the second BFI indication BFITRP#1 to the upper layer (e.g., MAC layer) of UE110. When the upper layer (e.g., MAC layer) receives the second BFI indication BFITRP#1, UE110 restarts the second BFD timer TTRP,1 and increments the value of the current second BFI counter by 1 (i.e., the second BFI counter = 2). When the quality of the radio link of BFD-RS#1 is lower than the threshold at the third monitoring time of the second reporting period PTRP#1, the second BFI indication BFITRP#1 is detected again in the lower layer (e.g., physical layer) of UE110, and UE110 can send the second BFI indication BFITRP#1 to the upper layer (e.g., MAC layer) of UE110. When the upper layer (e.g., MAC layer) receives the second BFI indication BFITRP#1, UE110 restarts the second BFD timer TTRP,1 and increments the value of the current second BFI counter by 1 (i.e., BFI counter = 3). Since the second BFI counter = 3 satisfies the condition: nBFI,1 ≧ Cmax,TRP1, UE110 declares that a beam failure has occurred at TRP130, that is, TRP130 instead of the wireless link of BFD-RS#1 It will be declared that it is necessary to find a new candidate beam.

[0058] According to the fourth embodiment of the BFD procedure of the present invention, only one BFD timer is set in the UE 110, and the UE 110 can determine the BFI counter based on the number of reported first BFI instructions BFITRP#0 and the number of reported second BFI instructions BFITRP#1. The difference between the second embodiment and the fourth embodiment is that in the fourth embodiment, the BFD timer is set in the lower layer (for example, the physical layer) of the UE 110. Therefore, in the fourth embodiment, when the UE 110 detects the first BFI instruction BFITRP#0 and / or the second BFI instruction BFITRP#1 in the lower layer, the UE 110 can update the BFD timer in the lower layer. The definitions and operations of the BFD timer and the BFI counter are similar to those of the second embodiment. Therefore, they will not be elaborated again.

[0059] Returning to FIG. 3, in step S320, the UE 310 declares that a beam failure has occurred at the TRP 320, and then a new candidate beam can be found for the TRP 320.

[0060] In one embodiment of the present invention, at least one candidate beam RS list may be set for the UE 110 by a base station (base stations) (e.g., TRP 120, TRP 130). Each candidate beam RS list may be associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID, or BFD-RS set ID / index, but the present invention is not limited thereto). FIG. 8A is a schematic diagram of the set candidate beam RS list according to an embodiment of the present invention. As shown in FIG. 8A, a candidate beam RS list #0 associated with TRP 120, a candidate beam RS list #1 associated with TRP 130, and a candidate beam RS list #2 associated with another one TRP (or other TRP(s)) can be set for the UE 110 by TRP 120, TRP 130, and another TRP, respectively. The candidate beam RS list #0 may include RS#A0 and RS#A2. The candidate beam RS list #1 may include RS#A1 and RS#A3. The candidate beam RS list #2 may include RS#A4 and RS#A5. It should be noted that the candidate beam RS list in FIG. 8A is merely used to explain the embodiment of the present invention, and the present invention is not limited thereto.

[0061] In another embodiment of the present invention, the UE 110 may have only one candidate beam RS list configured by a base station (e.g., TRP 120, TRP 130). Each RS in the candidate beam RS list may be associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID, or BFD-RS set ID / index, but the present invention is not limited thereto). FIG. 8B is a schematic diagram of a configured candidate beam RS list according to another embodiment of the present invention. As shown in FIG. 8B, a candidate beam RS list may be configured for the UE 110. The candidate beam RS list includes RS#A0 and RS#A2 associated with the TRP 120, RS#A1 and RS#A3 associated with the TRP 130, and RS#A4 and RS#A5 associated with another TRP (or other TRP(s)). Note that the candidate beam RS list in FIG. 8B is merely used to illustrate an embodiment of the present invention, and the present invention is not limited thereto.

[0062] In an embodiment of the present invention, the UE 110 can determine a measurement report and a reporting type of a candidate beam RS based on at least one of the following information: a default measurement report and a reporting type, a higher layer configuration (e.g., random resource control (RRC) and / or medium access control - control element (MAC CE)), and the UE's capabilities. In addition, in an embodiment of the present invention, the measurement report and the reporting type can support single-TRP or multi-TRP operations.

[0063] In an embodiment of the present invention, when a beam failure event associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID, or BFD-RS set ID / index, but the present invention is not limited thereto) is declared, UE110 can determine (or find) a candidate beam from the candidate beam RS list(s) associated with the TRP(s) for which a beam failure may not be declared. Taking FIG. 9A as an example. FIG. 9A is a schematic diagram of the measurement of candidate beam RS according to an embodiment of the present invention. As shown in FIG. 9A, when a beam failure occurs at TRP120, UE110 can perform measurements on the RS(s) in candidate beam RS list #1 associated with TRP130 to find or determine a candidate beam. It should be noted that FIG. 9A is merely used to illustrate an embodiment of the present invention and the present invention is not limited thereto.

[0064] In another embodiment of the present invention, when a beam failure event associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID, or BFD-RS set ID / index, but the present invention is not limited thereto) is declared, UE110 can determine a candidate beam from all candidate beam RS lists associated with the serving TRPs. Taking FIG. 9B as an example. FIG. 9B is a schematic diagram of the measurement of candidate beam RS according to another embodiment of the present invention. As shown in FIG. 9B, when a beam failure occurs at TRP120, UE110 can perform measurements on the RS(s) in candidate beam RS list #0 associated with TRP120 and candidate beam RS list #1 associated with TRP130 to find or determine a candidate beam. It should be noted that FIG. 9B is merely used to illustrate an embodiment of the present invention and the present invention is not limited thereto.

[0065] In another embodiment of the present invention, when a beam failure event associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID or BFD-RS set ID / index, but the present invention is not limited thereto) is declared, UE110 can determine candidate beams from all candidate beam RS lists. Taking FIG. 9C as an example. FIG. 9C is a schematic diagram of the measurement of candidate beam RS according to another embodiment of the present invention. As shown in FIG. 9C, when a beam failure occurs at TRP120, UE110 can perform measurements on the RS(s) in candidate beam RS list #0 associated with TRP120, candidate beam RS list #1 associated with TRP130, and candidate beam RS list #2 associated with another TRP that is not the serving TRP to find or determine candidate beams. It should be noted that FIG. 9C is only used to illustrate the embodiment of the present invention and the present invention is not limited thereto.

[0066] In another embodiment of the present invention, when a beam failure event associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID or BFD-RS set ID / index, but the present invention is not limited thereto) is declared, UE110 does not have to perform measurements to determine possible candidate beams, that is, the UE can fall back to single-TRP operation. For example, when a beam failure occurs at TRP120, UE110 does not have to perform measurements on the RS(s) in all candidate beam RS lists.

[0067] In another embodiment of the present invention, when a beam failure event associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID, or BFD-RS set ID / index, but the present invention is not limited thereto) is declared, UE110 can determine a candidate beam from a candidate beam RS list associated with the TRP for which the beam failure can be declared. In this embodiment, UE110 can determine candidate beam RSs that can be received simultaneously with the serving beam RS. That is, in this embodiment, for recovery to multiple TRP operations, UE110 can attempt to re-establish a connection with other TRPs other than the TRP for which a beam failure has not been declared. Taking FIG. 9D as an example. FIG. 9D is a schematic diagram of the measurement of candidate beam RSs according to another embodiment of the present invention. As shown in FIG. 9D, when a beam failure occurs at TRP120, UE110 can perform measurements of the RS(s) in candidate beam RS list #0 associated with TRP120 to find or determine candidate beam RSs that can be received simultaneously with serving BFD-RS #1. It should be noted that FIG. 9D is merely used to illustrate the embodiment of the present invention and the present invention is not limited thereto.

[0068] In another embodiment of the present invention, when a beam failure event associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID, or BFD-RS set ID / index, but the present invention is not limited thereto) is declared, UE110 can determine a candidate beam from a candidate beam RS list associated with TRPs excluding the TRP for which the beam failure has not been declared. In this embodiment, UE110 can determine candidate beam RSs that can be received simultaneously with the serving beam RS associated with the TRP for which the beam failure has not been declared. That is, in this embodiment, in order to recover to multi-TRP operation, UE110 can attempt to re-establish a connection with other TRPs other than the TRP for which the beam failure has not been declared. Taking FIG. 9E as an example. FIG. 9E is a schematic diagram of the measurement of candidate beam RS according to another embodiment of the present invention. As shown in FIG. 9E, when a beam failure occurs at TRP120, UE110 performs measurements of the RS(s) in candidate beam RS list #0 associated with TRP120 and candidate beam RS list #2 associated with another TRP to find, or determine, candidate beam RSs that can be received simultaneously with serving BFD-RS #1. It should be noted that FIG. 9E is merely used to illustrate the embodiment of the present invention and the present invention is not limited thereto.

[0069] In another embodiment of the present invention, when a beam failure event associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID, or BFD-RS set ID / index, but the present invention is not limited thereto) is declared, UE 110 can determine at least two candidate beams from all candidate beam RS lists associated with serving TRPs. In this embodiment, UE 110 can determine at least two candidate beam RSs that can be received simultaneously. That is, in this embodiment, to recover to multiple TRP operations, UE 110 can attempt to re-establish a connection with other TRPs other than the TRP for which a beam failure has not been declared. Taking FIG. 9F as an example. FIG. 9F is a schematic diagram of measurement of candidate beam RSs according to another embodiment of the present invention. As shown in FIG. 9F, when a beam failure occurs at TRP 120, UE 110 performs measurements of the RS(s) in candidate beam RS list #0 associated with TRP 120 and candidate beam RS list #1 associated with TRP 130 to find, or determine, at least two candidate beam RSs (e.g., RS#A2 and RS#A1) that can be received simultaneously by the UE. Note that FIG. 9F is merely used to illustrate an embodiment of the present invention and the present invention is not limited thereto.

[0070] In another embodiment of the present invention, when a beam failure event associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID, or BFD-RS set ID / index, but the present invention is not limited thereto) is declared, UE110 can determine at least two candidate beams from all candidate beam RS lists. In this embodiment, UE110 can determine at least two candidate beam RSs that can be received simultaneously. That is, in this embodiment, to recover multiple TRP operations, UE110 can attempt to re-establish a connection with other TRPs other than the TRP where the beam failure is not declared. Taking FIG. 9G as an example. FIG. 9G is a schematic diagram of the measurement of candidate beam RS according to another embodiment of the present invention. As shown in FIG. 9G, when a beam failure occurs at TRP120, UE110 performs measurements of RS(s) in candidate beam RS list #0 associated with TRP120, candidate beam RS list #1 associated with TRP130, and candidate beam RS list #2 associated with another TRP to find, or determine, at least two candidate beam RSs (e.g., RS#A2 and RS#A1) that can be received by UE110 simultaneously. It should be noted that FIG. 9G is only used to illustrate the embodiment of the present invention and the present invention is not limited thereto.

[0071] FIG. 10 is a flowchart for explaining a method for measuring candidate beam RS according to an embodiment of the present invention. This measurement method can be applied to the wireless communication system 200. In step S1010, when UE110 declares that a beam failure has occurred at TRP120, UE110 can determine whether a candidate beam RS that can be received simultaneously with BFD-RS#1 associated with TRP130 is found. In this measurement method, the operations described in FIG. 9D or FIG. 9E can be applied to step S1010.

[0072] If no candidate beam RS that can be received simultaneously with BFD-RS#1 associated with TRP130 is found, step S1020 is executed. In step S1020, UE110 may determine whether at least two candidate beam RSs that can be received simultaneously are found from all candidate beam RS lists. In this measurement method, the operations described in FIG. 9F or FIG. 9G can be applied to step S1020.

[0073] If no at least two candidate beam RSs that can be received simultaneously are found from all candidate beam RS lists, step S1030 is executed. In step S1030, UE110 may determine a candidate beam RS in a single TRP operation. In this measurement method, the operations described in FIG. 9A, FIG. 9B or FIG. 9C can be applied to step S1030.

[0074] FIG. 11 is a flowchart illustrating a method for measuring candidate beam RS according to another embodiment of the present invention. This measurement method can be applied to UE110. In step S1110, when a beam failure is declared for TRP120 by UE110, UE110 may determine whether a candidate beam RS that can be received simultaneously with BFD-RS#1 associated with TRP130 is found. In this measurement method, the operations described in FIG. 9D or FIG. 9E can be applied to step S1110.

[0075] If no candidate beam RS that can be received simultaneously with BFD-RS#1 associated with TRP130 is found, step S1120 is executed. In step S1120, UE110 can determine a candidate beam RS in a single TRP operation. In this measurement method, the operations described in FIG. 9A, FIG. 9B or FIG. 9C can be applied to step S1120.

[0076] FIG. 12 is a flowchart for explaining a method of measuring a candidate beam RS according to another embodiment of the present invention. This measurement method can be applied to UE110. In step S1210, when UE110 declares a beam failure for TRP120, UE110 can determine whether at least two candidate beam RSs that can be received simultaneously are found from all candidate beam RS lists. In this measurement method, the operations described in FIG. 9F or FIG. 9G can be applied to step S1210.

[0077] If at least two candidate beam RSs that can be received simultaneously are not found from all candidate beam RS lists, step S1220 is executed. In step S1220, UE110 can determine a candidate beam RS in a single TRP operation. In this measurement method, the operations described in FIG. 9A, FIG. 9B, or FIG. 9C can be applied to step S1220.

[0078] Return to FIG. 3. In step S330, UE310 can transmit a scheduling request for BFR to TRP320.

[0079] In an embodiment of the present invention, in order to report information related to BFR, at least one Physical Uplink Control Channel (PUCCH) resource associated with a corresponding scheduling request may be set for UE110, and each PUCCH resource may be associated with an index or identity (for example, CORESETPoolIndex, TRP_ID, or BFD-RS set ID / index, but the present invention is not limited thereto). In this embodiment, UE110 can transmit a PUCCH resource corresponding to a scheduling request associated with a TRP for which a beam failure may not be declared. Additionally, in this embodiment, at least one schedulingRequestIDForBFR may be set or provided for UE110, and each schedulingRequestIDForBFR may be associated with a PUCCH resource ID, and UE110 can transmit a scheduling request in a PUCCH resource having the PUCCH resource ID. Taking FIG. 13A as an example. FIG. 13A is a schematic diagram of PUCCH resource transmission corresponding to a scheduling request according to an embodiment of the present invention. As shown in FIG. 13A, in order to report information related to BFR, two PUCCH resources respectively associated with the corresponding scheduling request #0 and scheduling request #1 may be set for UE110. If UE110 declares that a beam failure has occurred at TRP120, UE110 can trigger scheduling request #1 (which is set by RRC, but the present invention is not limited thereto) to report information related to BFR. Then, UE110 can transmit the PUCCH resource corresponding to scheduling request #1 associated with TRP130 to TRP130. It should be noted that FIG. 13A is merely used to illustrate an embodiment of the present invention, and the present invention is not limited thereto.

[0080] In another embodiment of the present invention, to report information regarding the BFR, at least one Physical Uplink Control Channel (PUCCH) resource associated with the corresponding scheduling request may be set for the UE110, and each PUCCH resource may be associated with an index or identity (e.g., CORESETPoolIndex, TRP_ID, or BFD-RS set ID / index, but the present invention is not limited thereto). In this embodiment, when the UE110 declares that a beam failure has occurred at the TRP, the UE110 can transmit a PUCCH resource corresponding to the scheduling request associated with the TRP. Taking FIG. 13B as an example. FIG. 13B is a schematic diagram of PUCCH resource transmission corresponding to a scheduling request according to another embodiment of the present invention. As shown in FIG. 13B, two PUCCH resources respectively associated with the corresponding scheduling request #0 and scheduling request #1 may be set for the UE110 to report information regarding the BFR. When the UE110 declares that a beam failure has occurred at the TRP120, the UE110 may trigger the scheduling request #0 (which is set by the RRC, but the present invention is not limited thereto) to report information regarding the BFR. Then, the UE110 can transmit the PUCCH resource corresponding to the scheduling request #0 associated with the TRP120 to the TRP130. It should be noted that FIG. 13B is merely used to illustrate the embodiment of the present invention, and the present invention is not limited thereto.

[0081] Returning to FIG. 3. In step S340, the UE310 may report information regarding the BFR to the TRP320.

[0082] In an embodiment of the present invention, the UE110 is the spatial correlation information of the PUSCH resource Based on this, in order to report information regarding the BFR, it is possible to determine whether to transmit a physical uplink shared channel (PUSCH) resource used to accommodate the MAC CE. In this embodiment, the PUSCH resource can be scheduled by downlink control information (DCI), or can be set semi-statically by a higher layer parameter (for example, configuredGrantConfig, but the present invention is not limited thereto).

[0083] Regarding the PUSCH resource scheduled by DCI, the DCI may be associated with an index or identity (for example, CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto). For example, PUSCH resource #0 may be scheduled by the DCI in CORESET #A having CORESETPoolIndex 0, and PUSCH resource #1 may be scheduled by the DCI in CORESET #B having CORESETPoolIndex 1.

[0084] For the PUSCH resource semi-statically set by the higher layer parameter configuredGrantConfig, the configuredGrantConfig may be associated with an index or identity (for example, CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto). Furthermore, the configuredGrantConfig may include an srs-ResourceIndicator. The indicated sounding reference signal (SRS) resource set by the configuredGrantConfig may be associated with an index or identity (for example, CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto).

[0085] If the PUSCH resource available for a new transmission is associated with a TRP for which no beam failure has been declared, UE 110 may transmit the PUSCH resource used to accommodate the MAC CE in order to report information regarding the BFR. Taking FIG. 14A as an example. FIG. 14A is a schematic diagram of the determination of the PUSCH resource according to an embodiment of the present invention. As shown in FIG. 14A, when a beam failure is declared for TRP 120 by UE 110 and the PUSCH resource available for a new transmission is associated with TRP 130 for which no beam failure has been declared, UE 110 may transmit the PUSCH resource associated with TRP 130 used to accommodate the MAC CE in order to report information regarding the BFR. It should be noted that FIG. 14A is merely used to illustrate the embodiment of the present invention and the present invention is not limited thereto.

[0086] If the PUSCH resource available for a new transmission is associated with a TRP for which a beam failure has been declared, UE 110 does not have to transmit the PUSCH resource used to accommodate the MAC CE in order to report information regarding the BFR, and UE 110 may trigger a scheduling request for the BFR. Taking FIG. 14B as an example. FIG. 14B is a schematic diagram of the PUSCH resource determination according to another embodiment of the present invention. As shown in FIG. 14B, when a beam failure is declared for TRP 120 by UE 110 and the PUSCH resource available for a new transmission is associated with TRP 120, UE 110 does not have to transmit the PUSCH resource associated with TRP 120 used to accommodate the MAC CE in order to report information regarding the BFR. UE 110 may trigger a scheduling request for the BFR. It should be noted that FIG. 14B is merely used to illustrate the embodiment of the present invention and the present invention is not limited thereto.

[0087] In an embodiment of the present invention, when a beam failure is declared by UE110 for a TRP, UE110 may not perform uplink (UL) transmission associated with the TRP. The UL transmission may include, but is not limited to, PUCCH, random access channel (RACH), PUSCH (e.g., configured grant, dynamic grant), sounding reference signal (SRS) and / or demodulation reference signal (DM-RS).

[0088] In an embodiment of the present invention, when UE110 determines (or finds) a candidate beam from a candidate beam RS list(s) associated with a TRP(s) for which a beam failure may not be declared, the UE may report at least one of the following information to the base station. The information may include, but is not limited to, an index or identity associated with the TRP for which a beam failure is declared (e.g., at least one component carrier (CC) index, at least one new candidate beam, CORESETPoolIndex, TRP_ID, group / set ID, or group / set index), candidate beam RS ID, and serving cell index. In this embodiment, the radio link quality of the candidate beam RS having the reported candidate beam RS ID may be higher than that of the serving BFD-RS. Taking FIG. 9A as an example. As shown in FIG. 9A, UE110 may declare that a beam failure has occurred at TRP120, and UE110 may perform measurements on the RS(s) within candidate beam RS list #1 associated with TRP130. When UE110 determines that RS#A1 within candidate beam RS list #1 is the candidate beam RS used by the BFR information to report, the radio link quality of RS#A1 within candidate beam RS list #1 may be higher than that of the serving BFD-RS#1 associated with TRP130. It should be noted that the above example is merely used to illustrate the embodiments of the present invention and the present invention is not limited thereto.

[0089] In another embodiment of the present invention, when the UE 110 determines a candidate beam from all candidate beam RS lists, the UE may report at least one of the following information to the base station. The information may include an index or identity associated with the TRP for which a beam failure has been declared (e.g., at least one component carrier (CC) index, at least one new candidate beam, CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto), a candidate beam RS ID, and a serving cell index, but the present invention is not limited thereto. In this embodiment, the radio link quality of the candidate beam RS having the reported candidate beam RS ID may be higher than that of the serving BFD-RS. Taking FIG. 9A as an example. As shown in FIG. 9A, the UE 110 may declare that a beam failure has occurred at the TRP 120, and the UE 110 may perform measurements on the RS(s) in the candidate beam RS list #0 associated with the TRP 120 and the candidate beam RS list #1 associated with the TRP 130. When the UE 110 determines that the RS #A1 in the candidate beam RS list #1 is the candidate beam RS used to report the BFR information, the radio link quality of the RS #A1 in the candidate beam RS list #1 may be higher than that of the serving BFD-RS #1 associated with the TRP 130. It should be noted that the above example is merely used to illustrate the embodiments of the present invention and the present invention is not limited thereto.

[0090] In another embodiment of the present invention, when the UE 110 does not perform measurements to determine possible candidate beams, i.e., when the UE can fallback to a single TRP operation, the UE may report at least one of the following information to the base station. The information may include an index or identity associated with the TRP for which beam failure is declared (e.g., at least one component carrier (CC) index, at least one new candidate beam, CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto), and a serving cell index, but the present invention is not limited thereto. For example, when beam failure occurs at TRP 120, the UE 110 does not have to perform measurements of the RS(s) within the entire candidate beam RS list. Then, the UE 110 may report an index or identity associated with TRP 120 (e.g., CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto), and / or a serving cell index. It should be noted that the above example is merely used to illustrate an embodiment of the present invention and the present invention is not limited thereto.

[0091] In another embodiment of the present invention, when the UE110 determines (or finds) a candidate beam from a candidate beam RS list associated with a TRP for which a beam failure can be declared, the UE may report at least one of the following information to the base station. The information may include an index or identity associated with the TRP for which a beam failure is declared (e.g., at least one component carrier (CC) index, at least one new candidate beam, CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto), candidate beam RS ID, and serving cell index, but the present invention is not limited thereto. In this embodiment, the quality of the radio link of the candidate beam RS having the reported candidate beam RS ID may be higher than that of the serving BFD-RS. Taking FIG. 9D as an example. As shown in FIG. 9D, the UE110 may declare that a beam failure has occurred at the TRP120, and the UE110 may perform measurements of the RS(s) in the candidate beam RS list #0 associated with the TRP120. When the UE110 determines that the RS#A2 in the candidate beam RS list #0 is the candidate beam RS used by the BFR information to report, the quality of the radio link of the RS#A2 in the candidate beam RS list #0 may be higher than that of the serving BFD-RS#1 associated with the TRP130. It should be noted that the above example is merely used to illustrate the embodiment of the present invention, and the present invention is not limited thereto.

[0092] In another embodiment of the present invention, when the UE 110 determines (or finds) at least two candidate beams from all candidate beam RS lists associated with the serving TRPs, the UE may report at least one of the following information to the base station. The information may include an index or identity associated with a TRP for which a beam failure has been declared (e.g., at least one component carrier (CC) index, at least one new candidate beam, CORESETPoolIndex, TRP_ID, group / set ID, or group / set index, but the present invention is not limited thereto), at least two candidate beam RS IDs of candidate beam RSs that can be received simultaneously, and a serving cell index, but the present invention is not limited thereto. In this embodiment, the UE 110 cannot find any candidate beam RS that can be received simultaneously with the surviving BFD-RS. Taking FIG. 9F as an example. As shown in FIG. 9F, the UE 110 may declare that a beam failure has occurred at the TRP 120, and the UE 110 can perform measurements on the RS(s) in the candidate beam RS list #0 associated with the TRP 120 and the candidate beam RS list #1 associated with the TRP 130. The UE 110 cannot find any candidate beam RS that can be received simultaneously with the surviving BFD-RS #1. Then, the UE 110 finds RS #A2 in the candidate beam RS list #0 and RS #A1 in the candidate beam RS list #1 that can be received simultaneously as candidate beam RSs used to report the BFR information. It should be noted that the above example is merely used to illustrate the embodiments of the present invention and the present invention is not limited thereto.

[0093] In an embodiment of the present invention, after the UE110 reports a beam failure recovery request to the base station, the UE110 may assume that the default beam is associated with an index or identity (e.g., CORESETPoolIndex, TRP ID, group / set ID, or group / set index, but the present invention is not limited thereto) corresponding to a TRP for which a beam failure may not be declared. In this embodiment, after the UE110 transmits a PUCCH resource having a beam failure recovery request, after the UE110 transmits a PUSCH resource used to accommodate a MAC CE for reporting BFR-related information, or before the UE110 receives update information on the TCI state of the CORESET, if the offset between the reception of the DCI and the corresponding PDSCH is lower than the threshold timeDurationForQCL, the UE110 may assume that the DM-RS ports of the PDSCH associated with the value of the CORESETPoolIndex of the serving cell are quasi co-located with the RS(s) with respect to the quasi co-location indication of the CORESET having the lowest controlResourceSetId among the CORESETs for which the same value of the CORESETPoolIndex is set, which is used for the monitored search space. The CORESETPoolIndex is associated with a TRP for which a beam failure may not be declared. Taking FIG. 15 as an example. FIG. 15 is a schematic diagram of a default beam according to an embodiment of the present invention. In FIG. 15, it is assumed that the first Rx beam #0 is on the antenna panel #A for receiving the PDSCH resource transmitted from the TRP120, and the second Rx beam #1 is on the antenna panel #B for receiving the PDSCH resource transmitted from the TRP130. As shown in FIG. 15, the UE110 may declare that a beam failure has occurred at the TRP120.After UE110 reports a beam failure recovery request, the default Rx beam (the second Rx beam #1) can be associated with the TRP130 for which UE110 has not declared a beam failure. Note that FIG. 15 is merely used to illustrate an embodiment of the present invention and the present invention is not limited thereto.

[0094] FIG. 16 is a flowchart 1600 for explaining a beam failure reporting method according to an embodiment of the present invention. This beam failure reporting method can be applied to UE110. As shown in FIG. 16, in S1610, a radio frequency (RF) signal processing device of UE110 receives a first candidate beam RS list and a second candidate beam reference signal (RS) list. Among these, the first candidate beam RS list is associated with a first beam failure detection RS (BFD-RS) set, and the second candidate beam RS list is associated with a second BFD-RS set.

[0095] In step S162, the RF signal processing device of UE110 reports beam failure information. Among this, the beam failure information includes at least one of at least one component carrier (CC) index, at least one new candidate beam, the identity of the BFD-RS set, or the CORESETPoolIndex.

[0096] According to some embodiments of the present invention, the beam failure reporting method further includes, when the beam failure is related to the first BFD-RS set, a processor of UE110 executing measurements of the RSs in the second candidate beam RS list associated with the second BFD-RS set to find a candidate beam RS for use in the beam failure report.

[0097] According to some embodiments of the present invention, the beam failure reporting method includes, when the beam failure is related to the first BFD-RS set, a processor of UE110 executing the first BFD -Performing measurements of the RSs in the first candidate beam RS list associated with the -RS set and the second candidate beam RS list associated with the second BFD-RS set to find candidate beam RSs for use in beam failure reporting.

[0098] According to some embodiments of the present invention, when the beam failure is associated with the first BFD-RS set, the beam failure reporting method further includes the processor of UE110 performing measurements of the RSs in all candidate beam RS lists to find candidate beam RSs for use in beam failure reporting.

[0099] According to some embodiments of the present invention, when the beam failure is associated with the first BFD-RS set, the beam failure reporting method further includes the processor of UE110 performing measurements of the RSs in the first candidate beam RS list associated with the first BFD-RS set to find candidate beam RSs for use in beam failure reporting.

[0100] According to some embodiments of the present invention, when the beam failure is associated with the first BFD-RS set, the beam failure reporting method further includes the processor of UE110 performing measurements of the RSs in all candidate beam RS lists except the second candidate beam RS list associated with the second BFD-RS set to find candidate beam RSs for use in beam failure reporting.

[0101] According to some embodiments of the present invention, when the beam failure is associated with the first BFD-RS set, the beam failure reporting method further includes the processor of UE110 performing measurements of the RSs in the first candidate beam RS list associated with the first BFD-RS set to find the first candidate beam RS, and performing measurements of the RSs in the second candidate beam RS list associated with the second BFD-RS set to find the second candidate beam RS, wherein the first candidate beam RS and the second candidate beam RS are received by the UE simultaneously.

[0102] According to some embodiments of the present invention, when a beam obstruction is associated with a first set of BFD-RS, the processor of UE110 performs measurements of the RSs in all candidate beam RS lists to find a first candidate beam RS and a second candidate beam RS for use in a beam obstruction report. Among these, the first candidate beam RS and the second candidate beam RS are received by the UE simultaneously.

[0103] According to some embodiments of the present invention, in a beam obstruction reporting method, each candidate beam RS list is associated with a different set of BFD-RS.

[0104] According to some embodiments of the present invention, in a beam obstruction reporting method, the candidate beam RS list includes all the RSs associated with all the sets of BFD-RS.

[0105] According to some embodiments of the present invention, the beam obstruction reporting method may further include the RF signal processing device of UE110 transmitting a first scheduling request for beam obstruction recovery (BFR), where the first scheduling request is associated with a first set of BFD-RS. In one embodiment, when the beam obstruction is associated with a second set of BFD-RS, the RF signal processing device transmits a first physical uplink control channel (PUCCH) resource corresponding to the first scheduling request. In another embodiment, when the beam obstruction is associated with a first set of BFD-RS, the RF signal processing device transmits a first physical uplink control channel (PUCCH) resource corresponding to the first scheduling request.

[0106] According to some embodiments of the present invention, the beam failure reporting method may further include determining whether the processor of UE110 transmits a physical uplink shared channel (PUSCH) resource used to accommodate a medium access control element (MAC CE) for reporting information related to beam failure recovery (BFR). When the PUSCH resource available for a new transmission is associated with a first BFD-RS set for which no beam failure has been declared, the processor determines to transmit the PUSCH resource used to accommodate the MAC CE for reporting information related to BFR. When the PUSCH resource available for a new transmission is associated with a second BFD-RS set for which a beam failure has been declared, the processor determines not to transmit the PUSCH resource used to accommodate the MAC CE for reporting information related to BFR.

[0107] According to some embodiments of the present invention, the beam failure reporting method may further include the processor of the UE assuming that at least one DM-RS port of the PDSCH is associated with a BFD-RS set for which no beam failure has been declared.

[0108] The use of terms indicating order in the present disclosure and claims, such as "first", "second", "third", etc., is for illustrative purposes only. It does not imply any order or relationship by itself.

[0109] The steps of the methods described with respect to the aspects disclosed herein may be embodied directly in hardware, in software modules executed by a processor, or in a combination of both. Software modules (including, for example, executable instructions and associated data) and other data may reside in a data memory, such as a RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or other computer-readable storage media well known in the art. A sample storage medium may be connected to a device such as, for example, a computer / processor (which may be referred to herein, for convenience, as a "processor") such that the processor can read information (e.g., code) from, and write information to, the storage medium. The sample storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user device. Alternatively, the processor and the storage medium may exist in the user device as discrete components. Also, in some aspects, any suitable computer program product may include a computer-readable medium containing code for one or more aspects of the present disclosure. In some aspects, the computer program product may include a packaging material.

[0110] The above paragraphs describe a number of aspects. It will be apparent that the disclosure of the present invention can be implemented in many ways and that the specific configurations or functions in the disclosed embodiments are merely representative. Those skilled in the art will understand that all aspects disclosed in the present invention are independently applicable or combinable.

[0111] Although the present invention has been described by way of preferred embodiments using examples, it should be understood that the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the scope and spirit of the present invention. Therefore, the scope of the present invention should be defined and protected by the following claims and their equivalents.

Explanation of Reference Signs

[0112] 110, 310... User Equipment (UE) 111... Baseband Signal Processing Device 112... RF Signal Processing Device 112 113... Processor 114... Storage Device 120... TRP 130... TRP 200... Wireless Communication System 200 320... TRP BFD-RS#0, BFD-RS#1... Beam Failure Detection Reference Signal RS#A0, RS#A1, RS#A2, RS#A3, RS#A4... Reference Signal

Claims

1. A user equipment (UE) for use in beam failure reporting, having a radio frequency (RF) signal processing device, the radio frequency (RF) signal processing device comprising: means for receiving a first candidate beam reference signal (RS) list associated with a first beam failure detection reference signal (BFD-RS) set and a second candidate beam RS list associated with a second BFD-RS set; means for detecting the quality of BFD-RS included in the first BFD-RS set and / or the second BFD-RS set; means for providing a beam failure instance (BFI) when the detected quality is lower than a first threshold, triggering beam failure recovery when the number of BFIs is equal to or greater than a second threshold, and performing measurements of reference signals (RSs) in the received first candidate beam RS list and / or the received second candidate beam RS list to find at least one new candidate beam; means for reporting beam failure information associated with the first candidate beam RS list and / or the second candidate beam RS list; the beam failure information includes at least one of at least one component carrier (CC) index associated with a transmission and reception point (TRP) where beam failure has occurred, the identity of the BFD-RS set, or a CORESET Pool Index associated with the TRP where beam failure has occurred, and the at least one new candidate beam; when beam failure is associated with the first BFD-RS set, the processor of the user equipment performs measurements of RSs in the first candidate beam RS list associated with the first BFD-RS set and the second candidate beam RS list associated with the second BFD-RS set to find a candidate beam RS for use in beam failure reporting; A user equipment, wherein the processor of the user equipment assumes that at least one DM-RS port of the PDSCH is associated with a BFD-RS set for which beam failure has not been declared.

2. The user equipment according to claim 1, wherein each candidate beam RS list is associated with a different BFD-RS set.

3. The RF signal processing device transmits a first scheduling request for beam failure recovery (BFR), and when the beam failure is associated with the second BFD-RS set, the RF signal processing device transmits a first physical uplink control channel (PUCCH) resource corresponding to the first scheduling request associated with the first BFD-RS set, or when the beam failure is associated with the first BFD-RS set, the RF signal processing device transmits a first physical uplink control channel (PUCCH) resource corresponding to the first scheduling request associated with the second BFD-RS set. The user equipment according to claim 1.

4. The processor of the user equipment determines whether to transmit a physical uplink shared channel (PUSCH) resource used to accommodate a medium access control channel control element (MAC CE) for reporting information related to beam failure recovery (BFR), and if the PUSCH resource available for new transmission is associated with the first BFD-RS set for which no beam failure has been declared, the processor determines to transmit the PUSCH resource used to accommodate the MAC CE for reporting the information related to BFR, and if the PUSCH resource available for new transmission is associated with the second BFD-RS set for which a beam failure has been declared, the processor determines not to transmit the PUSCH resource used to accommodate the MAC CE for reporting the information related to BFR. The user equipment according to claim 1.

5. A beam failure reporting method applied to a user equipment (UE), comprising: receiving, by a radio frequency (RF) signal processing device of the user equipment, a first candidate beam reference signal (RS) list associated with a first beam failure detection reference signal (BFD-RS) set and a second candidate beam RS list associated with a second BFD-RS set; detecting, by the RF signal processing device, the quality of BFD-RS included in the first BFD-RS set and / or the second BFD-RS set; When the detected quality is lower than a first threshold by the RF signal processing device, a beam failure instance (BFI) is provided, and when the number of the BFIs is equal to or greater than a second threshold, beam failure recovery is triggered, and measurements of reference signals (RSs) in the received first candidate beam RS list and / or the received second candidate beam RS list are performed to find at least one new candidate beam; The RF signal processing device includes at least one of at least one component carrier (CC) index associated with a transmit-receive point (TRP) where beam failure has occurred, an identity of a BFD-RS set, or a CORESET Pool Index associated with the transmit-receive point (TRP) where beam failure has occurred, and the at least one new candidate beam, and reports beam failure information associated with the first candidate beam RS list and / or the second candidate beam RS list; including; When beam failure is related to the first BFD-RS set, the processor of the user equipment further includes performing measurements of RSs in the first candidate beam RS list associated with the first BFD-RS set and the second candidate beam RS list associated with the second BFD-RS set to find candidate beam RSs for use in a beam failure report; A beam failure reporting method, wherein the processor of the user equipment further includes assuming that at least one DM-RS port of the PDSCH is related to a BFD-RS set for which beam failure has not been declared.

6. The beam failure reporting method according to claim 5, wherein each candidate beam RS list is associated with a different BFD-RS set.

7. The beam failure reporting method according to claim 5, wherein the RF signal processing device further includes transmitting a first scheduling request for use in beam failure recovery (BFR).

8. When a beam failure is associated with the second BFD-RS set, the RF signal processing device transmits a first physical uplink control channel (PUCCH) resource corresponding to the first scheduling request associated with the first BFD-RS set, or When a beam failure is associated with the first BFD-RS set, the RF signal processing device transmits a first physical uplink control channel (PUCCH) resource corresponding to the first scheduling request associated with the second BFD-RS set The beam failure reporting method according to claim 7, further comprising. **Claim 9** The step of determining whether the processor of the user equipment transmits a physical uplink shared channel (PUSCH) resource used to accommodate a media access control channel control element (MAC CE) to report information regarding beam failure recovery (BFR), When the PUSCH resource available for a new transmission is associated with the first BFD-RS set for which no beam failure has been declared, the step of determining that the processor transmits the PUSCH resource used to accommodate the MAC CE to report the information regarding the BFR, and When the PUSCH resource available for a new transmission is associated with the second BFD-RS set for which a beam failure has been declared, the step of determining that the processor does not transmit the PUSCH resource used to accommodate the MAC CE to report the information regarding the BFR, The beam failure reporting method according to claim 5, further comprising.

Images