Terminal and wireless communication method

Abstract

The terminal receives beams from a plurality of cells including a non-serving cell formed by the same base station, and determines beam failure or candidate beams by determining received signals from beams from a plurality of cells including the non-serving cell.

Description

Technical Field

[0001] The invention relates to a terminal and a wireless communication method. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) has standardized Long Term Evolution (LTE), and has standardized LTE-Advanced (hereinafter referred to as LTE including LTE-Advanced) with the purpose of further speeding up LTE. In addition, 3GPP is also conducting research on the specifications of LTE's successor systems such as 5G New Radio (NR) or Next Generation (NG).

[0003] In NR, it is stipulated that when the UE detects a beam failure in the SS / PBCH block (SSB) or channel state information reference signal (CSI-RS) received from the serving cell, it determines a new candidate beam and attempts beam failure recovery (BFR: beam failure recovery).

[0004] Currently, in NR, research is underway to expand the scope of UE operations across multiple cells of the same base station, the so-called inter-cell multi-TRP (Transmission / Reception Point) / panel operation (Non-patent Document 1).

[0005] In inter-cell multi-TRP / panel operation, one gNB can operate multiple cells via multiple TRP / panels. Therefore, the UE can receive scheduling from multiple TRP / panels and send and receive data with multiple TRP / panels.

[0006] Prior art literature

[0007] Non-patent literature

[0008] Non-patent document 1: 3GPP TSG RAN Meeting #86, RP-193133, “New WID: Further developments on MIMO for NR”, Sitges, Spain, December 9-12, 2019 Summary of the invention

[0009] As described above, in NR, BFR is performed from the detection of beam failure to recovery, but in the current NR standard, the UE is set to monitor / utilize only the reference signal of the serving cell in addition to the L3 (Layer 3) measurement. That is, the UE can only perform BFR based on the reference signal of one TRP / panel in the inter-cell multi-TRP / panel operation, and cannot report the beam failure or even request BFR for the reference signal of the TRP / panel from the non-serving cell. Therefore, in the inter-cell multi-TRP / panel operation, even if a good connection with other cells other than the serving cell can be obtained, the UE may determine that it is a beam failure, resulting in unnecessary overhead and even delays caused by the interruption of the communication in progress and the BFR process.

[0010] Therefore, the present invention is made in view of the above situation, and an object of the present invention is to suppress unnecessary interruption, overhead or delay caused by radio link monitoring (RLM) and even BFR in inter-cell multi-TRP / panel operation.

[0011] One embodiment of the present invention provides a terminal (UE 200), which has: a receiving unit (receiving unit 220) that receives beams from multiple cells including non-service cells formed by the same base station; and a control unit (control unit 230) that determines beam failure or candidate beams by determining received signals from the beams of the multiple cells including the non-service cells.

[0012] In addition, a wireless communication method involved in one embodiment of the present invention includes the following steps: a step of receiving beams from multiple cells including non-service cells formed by the same base station; and a step of determining a beam failure or a candidate beam by determining a received signal from the beams of the multiple cells including the non-service cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1It is a diagram schematically showing the overall structure of the wireless communication system 10 .

[0014] Figure 2 is a diagram showing an example in which gNB100 generates three cells via three TRPs.

[0015] Figure 3 is a diagram showing an example of forming one TRP into beams #0-#5.

[0016] Figure 4 is a functional block diagram of UE 200.

[0017] Figure 5 is a diagram showing an example in which UE 200 receives beams from two cells (cells of PCI#0 and PCI#1) formed by the same gNB 100.

[0018] Figure 6 This is a diagram showing a setting example of RadioLinkMonitoringConfig defined in TS38.331 (v16.1.0).

[0019] Figure 7 This is a diagram showing a setting example of BeamFailureRecoveryConfig specified in TS38.331 (v16.1.0).

[0020] Figure 8 This is a flowchart showing the operation procedure of BFR (beam failure recovery) in Pcell / PScell ​​specified in 3GPP Release 15.

[0021] Fig. 9 This is an overall schematic diagram for explaining BFR in Pcell / PScell ​​specified in 3GPP Release 15.

[0022] Fig.10 This is a flowchart showing the operation procedure of BFR (Beam Failure Recovery) in the Scell ​​specified in 3GPP Release 16.

[0023] Fig.11 This is an overall schematic diagram for explaining BFR in Scell ​​specified in 3GPP Release 16.

[0024] Fig.12 The flowchart shows an example of an operation procedure (one-step BFR request) of BFR (recovery from beam failure) including a serving cell (SC) and a non-serving cell (NSC).

[0025] Fig.13 It is a flowchart showing an example of the operation procedure (two-step BFR request) of BFR (recovery from beam failure) in SC / NSC.

[0026] Fig.14 This is a diagram showing an example of the hardware configuration of the UE 200 . DETAILED DESCRIPTION

[0027] Hereinafter, the embodiments will be described based on the drawings. In addition, the same or similar reference numerals are given to the same functions and structures, and the description thereof will be appropriately omitted.

[0028] (1) Overall schematic structure of wireless communication system

[0029] Figure 1 This is a schematic overall structure diagram of the wireless communication system 10 involved in this embodiment. The wireless communication system 10 is a wireless communication system based on the 5G New Radio (New Radio: NR), including a next-generation radio access network 20 (Next Generation-Radio Access Network 20, hereinafter referred to as NG-RAN 20) and a terminal 200 (hereinafter referred to as UE200). In addition, the wireless communication system 10 supports at least one frequency band in the frequency range (Frequency Range: FR) 1 (410MHz ~ 7.125GHz) and FR2 (24.25GHz ~ 52.6GHz), and may also support other frequency bands.

[0030] NG-RAN 20 includes a radio base station 100 (hereinafter referred to as gNB 100). In addition, the specific structure of the wireless communication system 10 including the number of gNBs and UEs is not limited to Figure 1 Example shown.

[0031] The NG-RAN 20 actually includes a plurality of NG-RAN nodes (specifically, gNB (or ng-eNB)), which are connected to a 5G-based core network (5GC, not shown). In addition, the NG-RAN 20 and 5GC may be simply referred to as a "network".

[0032] gNB 100 is a 5G-based wireless base station that performs 5G-based wireless communications with UE 200. gNB 100 and UE 200 can support Massive MIMO (Multiple-Input Multiple-Output) that generates a beam BM with higher directivity by controlling wireless signals transmitted from multiple antenna elements, Carrier Aggregation (CA) that bundles and uses multiple component carriers (CCs), Dual Connectivity (DC) that simultaneously communicates between UE and two NG-RAN nodes, and Integrated Access and Backhaul (IAB) that integrates wireless backhaul between wireless communication nodes such as gNB and wireless access for UE.

[0033] Among them, gNB100 has multiple TRPs as shown in the figure. In this embodiment, TRP (transceiver point) is a unit of transceiver equipment that can form a cell, which can be a panel (panel) or simply a unit of antenna. In this embodiment, TRP involves the following content, which can be implemented by appropriate replacement.

[0034] CORESET (Control Resource Set) Pool Index = {0, 1}

[0035] 1st TCI (Transmission Configuration Index) state, 2nd TCI state

[0036] 1st CDM (Code Division Multiplexing) group, 2nd CDM group (of PDSCH (Physical Downlink Shared Channel) DMRS (Demodulation reference signal))

[0037] 1st PDSCH, 2nd PDSCH

[0038] RS port group, panel index, TCI-state / QCL / spatial-relation group index = {0,1}

[0039] In addition, the above is a case where there are two TRPs, and the same setting can be performed when there are more TPRs.

[0040] In addition, the number of TRPs is not limited to the example shown in the figure (in Figure 2 In the example, there are 3). Figure 2 : is a diagram showing an example of gNB100 generating three cells via three TRPs. That is, for the purpose of explaining the present embodiment, as shown in the figure, an example of forming three cells with physical cell ID (PCI) #1, PCI #2, and PCI #3 is shown. In addition, by controlling multiple TRPs, gNB100 can form a serving cell and a non-serving cell for UE 200. In addition, gNB100 performs control for enabling implementation of radio link monitoring (RLM) for serving cells and non-serving cells in UE 200.

[0041] Among them, in NR, a service cell can have a maximum of 8 / 64 SSBs in the frequency range FR1 / 2 respectively. That is, the maximum number of SSBs is determined by the frequency band. In the case of FR1 of 410MHz~7.125GHz, it is 8, and in the case of FR2 of 24.25GHz~52.6GHz, it is 64. Therefore, in the current NR standard, when performing inter-cellmulti-TRP / panel operation, the gNB can have a maximum of 8 / 64×TRP number of SSBs as a whole. In addition, for one TRP, it can have a maximum of 8 / 64 SSBs. Figure 2 In the example of FIG. 1 , 64 SSBs (SSB index #0 to #63 for identifying SSBs) are used for each TRP. In this embodiment, the TRP can form a beam. Figure 3 is a diagram showing an example of forming one TRP into beams #0-#5.

[0042] In beamforming, since the radio waves from the TRP are transmitted in a narrowed direction, the synchronization signal can be transmitted only to a part of the covered area at a certain timing. Therefore, in the synchronization signal of NR, the standard is established based on the premise of performing a process called beam sweeping, which sequentially sends beamformed signals to the entire coverage area where the radio waves can be transmitted from the TRP. In this case, the SSB index is used on both the UE and the gNB to determine which beam the captured synchronization signal corresponds to. Figure 3In the example of , an example is shown in which UE 200 captures a beam determined by SSB#2 from a TRP. In addition, in this example, one TRP has a maximum of 64 SSBs, so the maximum number of beams that can be used in SSB transmission is 64.

[0043] As described above, in the past, the UE was not aware of whether there were multiple TRPs and could only distinguish beams with different reference signals and / or synchronization signals (in this example, synchronization signals such as SSB) from the serving cell, but in the present embodiment, it is configured to be able to determine beams from multiple TRPs including non-serving cells. For example, in association with the action of monitoring reference signals such as SSB, cell-related information (PCI, etc.) may be assigned so that the UE 200 can observe and determine which cell the beam is from. In addition, in the present embodiment, synchronization signals such as SSB are sometimes included and referred to as reference signals (RS), but reference signals such as DMRS (Demodulation reference signal) may also be distinguished from synchronization signals such as SSB. Therefore, in the present embodiment, the reference signal may be replaced with a synchronization signal for implementation, and conversely, the synchronization signal such as SSB may be replaced with a reference signal (RS) for implementation.

[0044] (2) Functional block structure of wireless communication system

[0045] Next, a functional block configuration of the wireless communication system 10 will be described. Specifically, a functional block configuration of the UE 200 will be described.

[0046] Figure 4 is a functional block diagram of UE 200. Figure 4 As shown, UE 200 includes a radio signal transceiver 210 , an amplifier 220 , a modulation and demodulation unit 230 , a control signal and reference signal processing unit 240 , an encoder and decoder 250 , a data transceiver 260 , and a control unit 270 .

[0047] The wireless signal transceiver 210 transmits and receives wireless signals based on NR. The wireless signal transceiver 210 supports Massive MIMO, CA that bundles and uses multiple CCs, and DC that simultaneously communicates between the UE and two NG-RAN Nodes.

[0048] In this embodiment, the wireless signal transceiver unit 210 constitutes a receiving unit that receives beams from multiple cells (including multiple cells including non-serving cells) formed by the same base station (gNB100). Figure 5is a diagram showing an example of UE 200 receiving beams from two cells (cells of PCI#0 and PCI#1) formed by the same gNB 100. In addition, the serving cell of the present embodiment can be set to, for example, the cell that UE 200 is currently accessing. In addition, the non-serving cells of the present embodiment can be set to, for example, one or more cells other than the serving cell. In addition, in the present embodiment, for example, the serving cell is set to a PCell (Primary Cell) or a PSCell (Primary Secondary Cell), and at least one non-serving cell can be set in association with the PCell or the PSCell. In addition, according to the present embodiment, in Figure 5 In the illustrated case, one of the two cells PCI#0 and PCI#1 may be set as a service cell, and the other of the two cells may be set as a non-service cell. The wireless signal transceiver 210 may receive information (setting information, etc.) related to reference signals (SSB, etc.) from each cell.

[0049] In this embodiment, as an example, the information related to the reference signal (SSB, etc.) from each cell is given cell identification information (PCI, etc.), but as described below, the network (gNB100) may not send each SSB from multiple cells at the same time position (which can be replaced by time resources, time domain, etc.), but send the signal with a protection time of 1 to several code elements before and after. As a result, the wireless signal transceiver 210 can reliably obtain the respective received signals from multiple cells. In addition, the received signal is not limited to SSB, but may also be a control signal or data signal set with CSI-RS, other reference signals or TCI (Transmission Configuration Index).

[0050] In addition, the wireless signal transceiver unit 210 may also be configured as a sending unit that sends at least one capability information described below.

[0051] Capability information indicating the ability to detect beam failures in cells including non-serving cells

[0052] Capability information indicating the ability to recover from beam failure of cells including non-serving cells

[0053] · Capability information indicating the ability to detect candidate beams of cells including non-serving cells

[0054] In addition, the capability information of UE 200 may be UE capability information specified in 3GPP TS38.306 or the like.

[0055] In addition, the wireless signal transceiver unit 210 may also be configured as a sending unit that sends a beam failure recovery request (BFR request) of a non-serving cell (NSC) or a serving cell (SC) to the serving cell (SC) or the non-serving cell (NSC). That is, the wireless signal transceiver unit 210 may send the BFR request in any of the following ways.

[0056] Send NSC’s BFR request to SC

[0057] Send SC’s BFR request to NSC

[0058] Send SC’s BFR request to SC

[0059] Send NSC’s BFR request to NSC

[0060] The amplifier unit 220 is composed of a PA (Power Amplifier) / LNA (Low Noise Amplifier) ​​etc. The amplifier unit 220 amplifies the signal output from the modulation and demodulation unit 230 to a predetermined power level. In addition, the amplifier unit 220 amplifies the RF signal output from the wireless signal transmission and reception unit 210 .

[0061] The modem unit 230 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. according to each predetermined communication destination (gNB 100 or other gNB, or each cell).

[0062] The control signal / reference signal processing unit 240 performs processing related to various control signals transmitted and received by the UE 200 and processing related to various reference signals transmitted and received by the UE 200 .

[0063] Specifically, the control signal / reference signal processing unit 240 receives various control signals sent from the gNB 100 via a predetermined control channel, for example, control signals such as high-layer signals and RRC parameters. In addition, the control signal / reference signal processing unit 240 sends various control signals to the gNB 100 via a predetermined control channel.

[0064] Furthermore, the control signal / reference signal processing unit 240 performs processing using reference signals (RS) such as a demodulation reference signal (DMRS) and a phase tracking reference signal (PTRS).

[0065] DMRS is a terminal-specific reference signal (pilot signal) known between the base station and the terminal for estimating a fading channel used for data demodulation. PTRS is a terminal-specific reference signal for estimating phase noise, which is a problem in high frequency bands.

[0066] In addition, in addition to DMRS and PTRS, reference signals also include a channel state information-reference signal (CSI-RS) and a sounding reference signal (SRS).

[0067] In addition, the channels include control channels and data channels. The control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel, Downlink Control Information (DCI) including the Random Access Radio Network Temporary Identifier (RA-RNTI)), and Physical Broadcast Channel (PBCH).

[0068] In addition, the data channel includes PDSCH (Physical Downlink Shared Channel), PUSCH (Physical Uplink Shared Channel), etc. Data refers to data transmitted via the data channel.

[0069] The encoding / decoding unit 250 performs data segmentation / concatenation and channel coding / decoding, etc. according to each predetermined communication destination (gNB 100 or other gNB, or each cell).

[0070] Specifically, the encoding / decoding unit 250 divides the data output from the data transceiver unit 260 into predetermined sizes and performs channel coding on the divided data. In addition, the encoding / decoding unit 250 decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.

[0071] The data transceiver 260 performs transmission and reception of protocol data units (PDU) and service data units (SDU). Specifically, the data transceiver 260 performs assembly / disassembly of PDU / SDU in multiple layers (medium access control layer (MAC), radio link control layer (RLC), and packet data convergence protocol layer (PDCP)). In addition, the data transceiver 260 sends hybrid ARQ (Hybrid automatic repeat request). In addition, the data transceiver 260 performs error correction and retransmission control of data based on hybrid ARQ.

[0072] The control unit 270 controls each functional block constituting the UE 200. In particular, in the present embodiment, the control unit 270 determines the received signals of beams from multiple cells including a non-serving cell (NSC). Thus, the control unit 270 can determine beam failure and / or candidate beams based on the beam quality (e.g., RSRP) of the serving cell (SC) and the non-serving cell (NSC). For example, the control unit 270 can determine that it is a beam failure based on the reception quality (e.g., RSRP) of multiple beams. More specifically, the control unit 270 can determine that it is a beam failure when the reception quality (e.g., RSRP) of multiple beams is below or less than a predetermined threshold. In addition, the control unit 270 can select a candidate beam based on the signal quality (e.g., RSRP) of multiple candidate beams. For example, the control unit 270 can select a new beam from multiple candidate beams based on a predetermined threshold (e.g., a beam whose signal quality exceeds the threshold, etc.), or select the beam with the best signal quality among multiple candidate beams as a new beam.

[0073] For example, the control unit 270 assumes that information for identifying cells including non-service cells NSC (PCI (Physical Cell ID: physical cell ID), etc.) is included in the received signal or part of the information related to the received signal, or both (for example, reference signal information, setting information related to the reference signal, etc.). As a result, the control unit 270 can determine which beam from which cell to monitor through the cell identification information (PCI, etc.) together with the existing reference signal information (SSB index, etc.). Therefore, the control unit 270 can determine beam failure or candidate beams not only based on the quality of the beam from the service cell, but also based on the signal of the beam of the non-service cell (for example, RSRP (Reference signal received power)). For example, if the control unit 270 can obtain a good connection (for example, sufficient RSRP) from the non-service cell, it will not be determined as a beam failure, and unnecessary interruptions, overhead or delays caused by BFR can be suppressed.

[0074] In addition, since beam failure recovery (Beam Failure Recovery) is accompanied by beam failure (Beam Failure) detection, it is sometimes referred to as Beam Failure / Recovery. Therefore, in this embodiment, "beam failure" as a concept may include beam failure recovery, or, in this embodiment, "beam failure" may be replaced with "beam failure recovery" for implementation, or vice versa. Similarly, candidate beam detection (CBD: candidate beam detection) may be replaced with beam failure detection (BFD: beam failure detection) for implementation, or vice versa. As an example, beam failure / recovery is performed through the following four steps.

[0075] (1) Beam-failure detection: The UE detects when a beam failure occurs.

[0076] (2) Candidate-beam identification: The UE attempts to identify a new beam. More specifically, the UE attempts to identify a new beam pair based on the criteria of which connection can be restored.

[0077] (3) Recovery-request transmission: The UE sends a recovery request to the network.

[0078] (4) The network responds to the beam recovery request

[0079] In this embodiment, when UE 200 detects a beam failure (1), it can determine whether it is a beam failure based not only on the signal from the beam of the serving cell (SC) but also on the signal from the beam of the non-serving cell (NSC), and when determining a candidate beam (2), it can determine a new beam based not only on the signal from the beam of the serving cell (SC) but also on the signal from the beam of the non-serving cell (NSC). In other words, UE 200 can determine whether to send a beam failure recovery request based not only on the signal from the beam of the serving cell (SC) but also on the signal from the beam of the non-serving cell (NSC). In addition, UE 200 can determine whether to recover from the beam failure based not only on the signal from the beam of the serving cell (SC) but also on the signal from the beam of the non-serving cell (NSC).

[0080] In which, the control unit 270 can set the threshold for detecting a candidate beam from a non-service cell or detecting a beam failure (for example, a threshold of RSRP (in units of [dBm] or [W (Watt)])) to the same value as the threshold for detecting a candidate beam from a service cell or detecting a beam failure, a different value, or an offset value.

[0081] In addition, the control unit 270 may assume that no transmission to the serving cell or reception from the serving cell is performed in the same symbol as the resource of the received signal of the non-serving cell and / or 1 to several symbols before and after, or both. As described above, the signal is transmitted from the gNB 100 with a guard time of several symbols before and after so that the signals from multiple cells do not compete, so the control unit 270 can reliably obtain not only the beam reception signal from the serving cell, but also the beam reception signal from the non-serving cell.

[0082] (3) Operation of wireless communication system

[0083] Next, the operation of the wireless communication system 10 will be described.

[0084] (3.0) Reference to prior art

[0085] When explaining the following operation examples, first, the prior art and the existing operation examples serving as the premise will be explained.

[0086] Figure 6This is a diagram showing an example of setting RadioLinkMonitoringConfig specified in TS38.331 (v16.1.0). The reference signal (RS) for beam failure detection (BFD) is set for the serving cell through RRC signaling. Figure 6 As shown in the figure, there is no IE (information element: information element) / field indicating the cell ID, and the reference signal (RS) sent from the non-serving cell cannot be set for BFD. Therefore, in this embodiment, as an example, an IE (information element) / field indicating the cell ID is added, and the UE 200 can determine the cell ID, so that not only the beam signal from the serving cell but also the beam signal from the non-serving cell can be referenced for BFD.

[0087] also, Figure 7 This is a diagram showing an example of the setting of BeamFailureRecoveryConfig specified in TS38.331 (v16.1.0). As described above, candidate signals (SSB, CSI-RS, etc.) for beam failure recovery (BFR) are set for the serving cell, but Figure 7 As shown in the figure, there is no IE (information element) / field indicating the cell ID, and the signal (SSB, CSI-RS, etc.) sent from the non-serving cell cannot be set for BFR. Therefore, in this embodiment, as an example, an IE (information element) / field indicating the cell ID is added, and the UE 200 can determine the cell ID, so that not only the beam signal from the serving cell but also the beam signal from the non-serving cell can be referenced for BFD.

[0088] Figure 8 1 is a flowchart showing the operation process of BFR (recovery from beam failure) in Pcell / PScell ​​specified in 3GPP Release 15. In addition, Fig. 9 This is an overall schematic diagram for explaining BFR in Pcell / PScell ​​specified in 3GPP Release 15. That is, when beam failure (BF) occurs between Pcell / PScell ​​and UE, UE sends a BFR request to Pcell / PScell ​​in 1 step.

[0089] More specifically, if Figure 8As shown, when the UE detects beam failure (BF) based on the quality (e.g., RSRP) of all beams from the Pcell / PSCell according to a threshold (e.g., RSRS, etc. is less than or below the threshold) (step 1), it searches for a new candidate beam (step 2). Specifically, the UE selects a beam signal with the largest L1 (Layer 1)-RSRP (Reference Signal Received Power) from the received beam signals.

[0090] Then, the UE sends a one-step BFR request to the PCell / PSCell at the PRACH occasion associated with the selected new beam (step 3).

[0091] When the PCell / PSCell sends a BFR response to the UE in response to the received BFR request (step 4), the UE receives the BFR response within the timing of the BFR response window until 28 symbols later, and then updates the QCL (Quasi Co Location) of CORESET (Control Resource Set) 0 to the new beam, thereby completing BFR.

[0092] In addition, in the case of SCell beam failure, the following two-step BFR request is required. Fig.10 1 is a flowchart showing the operation process of BFR (recovery from beam failure) in Scell ​​specified in 3GPP Release 16. Fig.11 This is an overall schematic diagram for explaining BFR in Scell ​​specified in 3GPP Release 16. That is, when beam failure (BF) occurs between the Scell ​​and the UE, the UE sends a BFR request to the Pcell / PScell ​​in two steps.

[0093] Specifically, if Fig.10 As shown, when beam failure (BF) is detected by the fact that all beams from the SCell are less than a threshold (step A), as the first step in the two-step BFR request, the UE uses PUCCH to send a scheduling request (SR (Scheduling Request)) to the Pcell / PScell ​​(step B).

[0094] In response to the received SR, the PCell / PScell ​​transmits a UL (uplink) grant to the UE in order to perform PUSCH transmission in the second step of the two-step BFR request (step C).

[0095] Then, the UE searches for a new candidate beam (step D). Specifically, the UE selects the beam with the largest L1-RSRP from among the multiple candidate beam signals received from the Scell ​​as the new beam.

[0096] Then, as the second step in the two-step BFR request, the UE uses the PUSCH authorized by the UL grant to send a MAC CE (MAC Control Element) containing the faulty CC (Component Carrier) index and the beam index of the selected new beam to the PCell / PScell ​​(step E).

[0097] When the PCell / PSCell sends a BFR response (BFR response) to the UE in response to the received BFR request in step 2 (step F), the UE receives the BFR response within the timing of the BFR response window, and updates the QCL (Quasi Co Location) of the PDCCH / PUCCH to the new beam after 28 symbols, thereby completing the BFR.

[0098] In this embodiment, the above-mentioned 1-step BFR request and 2-step BFR request are applied and improved to be used for BFR for non-serving cells. The following is an operation example of this embodiment. In addition, the following operation examples can be arbitrarily combined for implementation.

[0099] (3.1) Action Example 1

[0100] The following describes the setting of reference signals (RSs) that support non-serving cell TRP for beam failure detection (BFD (beam failure detection)) and / or candidate beam detection (CBD (candidate beam detection)).

[0101] Specifically, for example, a new IE (information element) for indicating a cell ID is introduced in RadioLinkMonitoring (RLM) RS, BFR-SSB-Resource and / or BFR-CSIRS-Resource. If there is no new IE for cell ID, UE 200 assumes the BFD / CBD RS of the serving cell as before.

[0102] Furthermore, UE 200 may assume that at least one of the reference signals RSs set for BFD / CBD is a reference signal of the serving cell.

[0103] In addition, regarding the reference signal RS set in relation to the non-service cell TRP, any of the following methods may be adopted.

[0104] (not CSI-RS) Limited to SSB.

[0105] (not SSB) limited to CSI-RS.

[0106] No special restrictions (mixed settings of SSB and CSI-RS are allowed.)

[0107] in, Fig.12 The flowchart shows an example of the operation procedure (one-step BFR request) of BFR (recovery from beam failure) including a serving cell (SC) and a non-serving cell (NSC).

[0108] like Fig.12 As shown, UE 200 performs beam failure (BF) detection (step 1). For example, for the reception quality of RSRP and the like of the beams from the SC and the NSC, it can be determined as a beam failure according to a threshold. For example, UE 200 can determine that it is a beam failure when the reception quality (e.g., RSRP) of multiple beams is below a predetermined threshold or less than the threshold.

[0109] When BF is determined, UE 200 searches for a new candidate beam (step 2). Specifically, UE 200 may select a new beam based on the quality (e.g., RSRP) of beam signals received from the serving cell and the non-serving cell. For example, UE 200 may select the beam with the largest RSRP among the beam signals received from the serving cell and the non-serving cell as the new beam.

[0110] Then, UE 200 sends a 1-step BFR request to the network at the PRACH occasion associated with the selected new beam (step 3). UE 200 may send a BFR request for SC beam failure to the SC or send a BFR request for SC beam failure to the NSC.

[0111] When the SC / NSC sends a BFR response to the received BFR request to the UE 200 (step 4), the UE 200 receives the BFR response and completes the BFR by updating the QCL (QuasiCo Location) of the CORESET (Control Resource Set) 0 to the new beam.

[0112] In addition, when performing a 2-step BFR request, it is as follows. Fig.13 This is a flowchart showing an example of the operation process (two-step BFR request) of BFR (recovery from beam failure) in SC / NSC. That is, when beam failure (BF) occurs between SC / NSC and UE, UE 200 sends a BFR request to NSC / SC in two steps.

[0113] Specifically, if Fig.13 As shown, when the quality of the received signal from the beams of the SC and the NSC (e.g., RSRP) is less than a threshold value, etc., and the UE 200 detects a beam failure (BF) (step A), the UE 200 sends a scheduling request (SR (Scheduling Request)) to the network using the PUCCH as the first step in the two-step BFR request (step B). That is, the UE can send the BFR request of the first step to the NSC, and can also send the BFR request of the first step to the SC.

[0114] In response to the received SR, the NSC / SC sends a UL grant to the UE 200 to perform the second step of the two-step BFR request, namely, PUSCH transmission (step C).

[0115] Then, the UE 200 searches for a new candidate beam (step D). Specifically, the UE may select a beam having the largest signal quality (eg, RSRP) among beam signals received from the SC and the NSC as a new beam.

[0116] Then, as the second step of the 2-step BFR request, UE 200 uses the PUSCH authorized by the UL grant to send a MAC CE including the CC index of the failed and the beam index of the selected new beam to the NSC / SC (step E). In addition, the CC index and / or beam index can extend the information used to determine which beam it is, and include cell identification information (cell ID, etc.) to determine which cell it is.

[0117] When the NSC / SC sends a BFR response (BFR response) to the UE 200 in response to the received BFR request in step 2 (step F), the UE receives the BFR response and completes the BFR by updating the QCL (Quasi CoLocation) of the PDCCH / PUCCH to the new beam.

[0118] This concludes the description of Operation Example 1. In addition, in this operation example, the following options can be adopted.

[0119] (3.1.1) Option 1

[0120] As the RSRP threshold used for determining the CBD, the following threshold can be adopted.

[0121] (Alt. 1) The RSRP threshold (rsrp-ThresholdSSB or rsrp-ThresholdBFR-r16) of the candidate beam detection (CBD) of the non-serving cell can be set to the same value as the RSRP threshold (rsrp-ThresholdSSBm or rsrp-ThresholdBFR-r16) of the CBD of the serving cell. In this case, there is no need to set an explicit setting for the non-serving cell.

[0122] (Alt.2) The RSRP threshold (rsrp-ThresholdSSB or rsrp-ThresholdBFR-r16) of the candidate beam detection (CBD) of the non-serving cell can be set to be different from the RSRP threshold (rsrp-ThresholdSSBm or rsrp-ThresholdBFR-r16) of the CBD of the serving cell. For example, other RSRP threshold parameters can be set for non-serving cells, and parameters representing offset values ​​from the threshold of the serving cell can also be set. In addition, UE 200 can imagine a situation where the threshold for non-serving cells is higher than the threshold for serving cells. In this case, frequent beam switching can be suppressed.

[0123] (3.1.2) Option 2

[0124] In this operation example 1, the following scheduling options can be adopted. In addition, the following can be implemented only when the conditions of 8.5.7 (8.5.8) of TS38.133 are satisfied.

[0125] (Alt.1) UE 200 does not assume that PUCCH, PUSCH or SRS are transmitted, and / or PDCCH, PDSCH, CSI-RS for tracking, or CSI-RS for CQI are received in RS resource symbols measured for BFD / CBD (as currently specified).

[0126] (Alt.2) UE 200 may not assume that, when measuring RS resources from a non-serving cell TRP for BFD / CBD, PUCCH, PUSCH or SRS is transmitted to the serving cell, and / or PDCCH, PDSCH, CSI-RS for tracking, or CSI-RS for CQI is received in the same symbol and / or at least 1 symbol before and after the RS resources for BFD / CBD. That is, when receiving the RS of the NSC, UE 200 only needs to form a receiving beam, and no other transmit / receive beams are formed toward the SC in the same time-frequency resources. As a result, UE 200 can reliably receive the reference signal from the NSC.

[0127] (3.1.3) Option 3

[0128] In this operation example 1, the following destinations can be adopted as the transmission destination of the BFR request.

[0129] (Alt. 1) When it is determined as BFD in the non-serving cell, UE 200 can send a BFR request to the serving cell using PRACH / PUCCH / PUSCH / MAC CE.

[0130] (Alt. 2) When it is determined to be BFD in the serving cell, UE 200 can send a BFR request to the serving cell using PRACH / PUCCH / PUSCH / MAC CE.

[0131] (Alt. 3) When it is determined that the non-serving cell is in BFD, UE 200 can send a BFR request to the non-serving cell using PRACH / PUCCH / PUSCH / MAC CE.

[0132] (Alt. 4) When it is determined as BFD in the serving cell, UE 200 can send a BFR request to the non-serving cell using PRACH / PUCCH / PUSCH / MAC CE.

[0133] In addition, the above-mentioned BFR request may include information indicating whether it is BFD / BFR in the serving cell or BFD / BFR in the non-serving cell. Therefore, any of the following forms may be adopted.

[0134] 1) PRACH preamble / PUCCH resource is configured for use in the serving cell or the non-serving cell, and UE 200 selects one of these according to BFD in the serving cell or the non-serving cell.

[0135] 2) A new bit field indicating the serving cell or non-serving cell is introduced into the BFR MAC CE. For example, the new bit field may be 1 bit or may be multiple bits indicating the serving cell ID.

[0136] (3.2) Action Example 2

[0137] In this action example, UE 200 sends capability information related to beam detection (beam failure) of cells including non-serving cells to the network. For example, UE 200 may send at least one capability information (UE capability information, etc.) among the following capability information to the network.

[0138] Capability information indicating the ability to detect beam failures in cells including non-serving cells

[0139] Capability information indicating the ability to recover from beam failure of cells including non-serving cells

[0140] Capability information indicating the ability to detect candidate beams of cells including non-serving cells

[0141] As a specific example, UE 200 may send capability information indicating the ability to support BFR using RS from non-serving cell TRP to the network (gNB 100, etc.). In addition, only when the support capability is indicated from UE 200, UE 200 sets RS for non-serving cell TRP through the network to perform BFD / CBD.

[0142] In addition, the capability information listed above can be summarized into one information or separated into different information. Specifically, the capability of performing BFD based on the CSI-RS of non-service cells, the capability of performing CBD based on the SSB of non-service cells, and the capability of performing CBD based on the CSI-RS of non-service cells can be separated into different capabilities or grouped into one capability.

[0143] (4) Action and Effect

[0144] According to the above-mentioned implementation, the following effects can be obtained. As described above, UE 200 receives beams from multiple cells (NSC and SC) of gNB 100, determines the received signals of beams from multiple cells, and thus determines beam failure or candidate beams.

[0145] That is, UE 200 can identify not only the reception signal from the conventional SC beam but also the reception signal from the NSC beam.

[0146] Furthermore, UE 200 can also determine beam failure or candidate beams based on beam reception signals of the SC and NSC.

[0147] Therefore, even when the beam reception signal from the SC is not good, when the beam reception signal from the NSC is good, the UE 200 does not need to determine that it is a beam failure and does not need to search for a new candidate beam.

[0148] Therefore, in inter-cell multi-TRP / panel operation, unnecessary interruption, overhead, or delay caused by RLM or BFR can be suppressed.

[0149] In addition, in the present embodiment, UE 200 assumes that the cell identification information including the NSC is included in the received signal or part of the information related to the received signal, or both. Therefore, UE 200 can efficiently identify which cell the beam signal comes from.

[0150] In addition, in this embodiment, UE 200 transmits capability information indicating at least one of (1) a capability to detect a beam failure of a cell including an NSC, (2) a capability to recover from a beam failure of a cell including an NSC, and / or (3) a capability to detect a candidate beam of a cell including an NSC to the network (SC or NSC of gNB 100, etc.). Therefore, the network can set signal information indicating that NSC can be determined for UE 200 indicating this capability.

[0151] In addition, in this embodiment, the UE 200 can set the threshold of CBD or BFD for NSC to the same value as the threshold of CBD or BFD for SC, a different value, or a value with an offset. Thus, the setting is simplified by using the same threshold, or frequent beam switching is suppressed by using different thresholds such as offset.

[0152] In addition, in this embodiment, UE 200 may assume that no transmission to or reception from SC is performed in the resources of the NSC reception signal and the same symbol and / or the preceding and following symbols. Thus, UE 200 can reliably obtain the beam reception signal from NSC.

[0153] In addition, in this embodiment, a BFR request of the NSC or SC can be sent to the SC or NSC. This can avoid connections that cause failures or perform flexible network configuration.

[0154] (5) Other Implementation Methods

[0155] As mentioned above, although the content of this invention was demonstrated based on an Example, this invention is not limited to these descriptions, and it is obvious to a person skilled in the art that various deformation|transformation and improvement are possible.

[0156] For example, in the above-mentioned embodiment, each place where "determination" is recorded for BFD / BFR / CBD can be replaced with "detection" or "determination", and conversely, each place where "detection" is recorded can be replaced with "determination" or "determination".

[0157] In the above-mentioned embodiments, it is conceivable that there are both BFRs for Pcell / PScell ​​and BFRs for Scell. For example, different CC indexes indicating whether it is a Pcell or an Scell ​​may be set. In addition, different PCIs indicating whether it is an SC or an NSC may also be set.

[0158] In addition, the block diagram ( Figure 4 ) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, using wires, wirelessly, etc.) and implemented using these multiple devices. The functional block can also be implemented by combining software with the above-mentioned one device or the above-mentioned multiple devices.

[0159] Functionally, it includes judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but is not limited to these. For example, the functional block (structural part) that enables the sending function is called a transmitting unit or a transmitter. In short, as mentioned above, there is no particular limitation on the implementation method.

[0160] Furthermore, the above-mentioned UE 200 may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig.14 2 is a diagram showing an example of the hardware configuration of UE 200. Fig.14 As shown, UE 200 may also be configured as a computer device including a processor 1001, a memory 1002 (memory), a storage 1003 (storage), a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0161] In the following description, the word "device" may be replaced by "circuit", "device", "unit", etc. The hardware structure of the device may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0162] Each functional block of UE 200 (see Figure 4 ) is implemented by any hardware element or combination of hardware elements of the computer device.

[0163] In addition, each function in UE 200 is implemented by the following method: predetermined software (program) is read into hardware such as processor 1001 and memory 1002, so that processor 1001 performs calculations and controls the communication of communication device 1004 or controls at least one of the reading and writing of data in memory 1002 and storage 1003.

[0164] The processor 1001 controls the entire computer by, for example, executing an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, a calculation device, a register, and the like.

[0165] In addition, the processor 1001 reads a program (program code), a software module or data, etc. from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and performs various processes accordingly. As a program, a program that causes a computer to perform at least a part of the actions described in the above-mentioned embodiments is used. In addition, with respect to the above-mentioned various processes, although it is described that the above-mentioned various processes are performed by one processor 1001, the above-mentioned various processes can also be performed simultaneously or sequentially by more than two processors 1001. The processor 1001 can also be installed by more than one chip. In addition, the program can also be sent from the network via a telecommunication line.

[0166] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 may store a program (program code), a software module, etc. that can execute a method according to an embodiment of the present disclosure.

[0167] The memory 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (e.g., a compressed disk, a digital versatile disk, a Blu-ray (registered trademark) disk, a smart card, a flash memory (e.g., a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic strip, etc. The memory 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, other appropriate media such as a database, a server, etc. that includes at least one of the memory 1002 and the memory 1003.

[0168] The communication device 1004 is hardware (transceiver) used to communicate between computers via at least one of a wired network and a wireless network, and may also be called a network device, a network controller, a network card, a communication module, etc.

[0169] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., for example, in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0170] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, an LED light, etc.). In addition, the input device 1005 and the output device 1006 may also be integrally formed (e.g., a touch panel).

[0171] In addition, the processor 1001 and the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for each device.

[0172] In addition, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and a part or all of each functional block may be implemented by the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

[0173] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information: DCI), uplink control information (Uplink Control Information: UCI)), high-level signaling (e.g., RRC signaling, medium access control (Medium Access Control: MAC) signaling, broadcast information (Master Information Block: MIB, System Information Block: SIB)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0174] Each form / embodiment described in the present disclosure may also be applied to at least one of Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), a system using other appropriate systems, and a next-generation system extended therefrom. In addition, a combination of a plurality of systems (for example, a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0175] The processing procedures, timings, processes, etc. of each form / implementation described in this disclosure may be changed in order without contradiction. For example, for the method described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0176] In the present disclosure, specific actions performed by a base station are sometimes performed by its upper node depending on the situation. In a network consisting of one or more network nodes having a base station, various actions performed to communicate with a terminal can be performed by at least one of the base station and other network nodes other than the base station (for example, consider MME or S-GW, etc., but not limited to these). In the above, the case where there is one other network node other than the base station is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, MME and S-GW).

[0177] Information, signals (information, etc.) can be output from a higher layer (or lower layer) to a lower layer (or higher layer), and can also be input or output via multiple network nodes.

[0178] The input or output information can be stored in a specific location (e.g., memory) or managed using a management table. The input or output information can be rewritten, updated, or appended. The output information can also be deleted. The input information can also be sent to other devices.

[0179] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value (Boolean: true or false), or by comparison of numerical values ​​(for example, comparison with a predetermined value).

[0180] Each form / implementation described in the present disclosure may be used alone or in combination, and may be switched depending on the execution. In addition, notification of scheduled information is not limited to being performed explicitly (e.g., notification of "yes X"), but may also be performed implicitly (e.g., notification of the scheduled information is not performed).

[0181] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to commands, sets of commands, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0182] In addition, software, commands, information, etc. may be sent and received via a transmission medium. For example, when software is sent from a web page, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0183] The information, signals, etc. described in the present disclosure may also be represented by any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be involved in the above description as a whole may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0184] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may also be a signal (signaling). In addition, a signal may also be a message. In addition, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0185] As used in this disclosure, the terms "system" and "network" may be used interchangeably.

[0186] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0187] The names used for the above parameters are not limiting in any way. Furthermore, the formulas etc. using these parameters may sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by appropriate names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0188] In the present disclosure, the terms "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier" and the like are used interchangeably. Sometimes, a base station is also referred to as a macro cell, a small cell, a micro cell, a pico cell, etc.

[0189] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head: RRH).

[0190] The terms "cell" or "sector" refer to a part or the entirety of a coverage area of ​​at least one of a base station and a base station subsystem that provide communication services within the coverage area.

[0191] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0192] For mobile stations, those skilled in the art sometimes also use the following terms: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0193] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a means of transportation (e.g., a car, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0194] In addition, the base station in the present disclosure may also be replaced by a mobile station (user terminal, the same below). For example, various forms / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a mobile station is replaced by communication between multiple mobile stations (for example, may also be referred to as device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it is also possible to set a structure in which the mobile station has the functions of the base station. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0195] Likewise, the mobile station in the present disclosure may be replaced by a base station. In this case, the base station may have the same functions as the mobile station.

[0196] The terms "connected", "coupled" or all variations of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include the situation where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used to replace "connection". In the context of the present disclosure, for two elements, it may be considered that they are "connected" or "coupled" to each other by using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, by using electromagnetic energy having wavelengths in the wireless frequency domain, microwave region, and light (including both visible and invisible) region, etc.

[0197] The reference signal may be referred to as Reference Signal (RS) for short, or may be referred to as a pilot signal depending on the applied standard.

[0198] The phrase "according to" used in the present disclosure does not mean "only according to" unless otherwise expressly stated. In other words, the phrase "according to" means both "only according to" and "at least according to".

[0199] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not necessarily limit the number and order of these elements. These terms are used in this disclosure as a simple method to distinguish between two or more elements. Therefore, a reference to a first and a second element does not mean that only two elements can be used or that the first element must precede the second element in any form.

[0200] When the terms "include," "including," and variations thereof are used in the present disclosure, these terms are intended to be inclusive, as is the term "comprising." Furthermore, the term "or" used in the present disclosure does not mean an exclusive or.

[0201] In the present disclosure, when an article is added by translation, such as a, an, and the in English, for example, the present disclosure also includes the case where the noun following the article is in plural form.

[0202] In the present disclosure, the term "A and B are different" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0203] The present disclosure is described in detail above, but it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as a modification and variation without departing from the subject matter and scope of the present disclosure as determined by the claims. Therefore, the purpose of the description of the present disclosure is to illustrate and not to have any limiting meaning on the present disclosure.

[0204] Description of labels:

[0205] 10 Wireless Communication Systems

[0206] 20 NG-RAN

[0207] 100 gNB

[0208] 200 UE

[0209] 210 Sending Department

[0210] 220 Receiving Department

[0211] 230 Control Department

[0212] 1001 Processor

[0213] 1002 Memory

[0214] 1003 Memory

[0215] 1004 Communication device

[0216] 1005 Input Device

[0217] 1006 Output Device

[0218] 1007 Bus

[0219] BM Beam

[0220] SC Service Cell

[0221] NSC Non-Serving Cell

Claims

1. A terminal, wherein: The terminal has: a receiving unit that receives a plurality of reference signal setting information for determining candidate beams for beam failure recovery; and a sending unit, which sends a recovery request through a physical uplink control channel, Each of the reference signal setting information is associated with different cell identification information, Each reference signal configuration information for beam failure detection is associated with a different physical uplink control channel.

2. The terminal according to claim 1, wherein: In the plurality of reference signal configuration information, thresholds for selecting the candidate beams are set to the same value.

3. A wireless communication method, wherein: The wireless communication method comprises the following steps: receiving a plurality of reference signal setting information for determining candidate beams for beam failure recovery; and Send a resume request via the physical uplink control channel, Each of the reference signal setting information is associated with different cell identification information, Each reference signal configuration information for beam failure detection is associated with a different physical uplink control channel.

4. A wireless communication system comprising a base station and a terminal communicating with the base station, The base station includes a transmitting unit configured to transmit a plurality of reference signal setting information for determining candidate beams for beam failure recovery. The terminal has: a receiving unit configured to receive the plurality of reference signal setting information; and a sending unit, which sends a recovery request through a physical uplink control channel, Each of the reference signal setting information is associated with different cell identification information, Each reference signal configuration information for beam failure detection is associated with a different physical uplink control channel.

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