Terminal, wireless communication method, base station and system

Abstract

A terminal according to an embodiment of the present disclosure has: a transmission unit that, when a beam failure has been detected at a transmission / reception point (TRP), transmits a scheduling request using another uplink control channel resource differing from the uplink control channel resource associated with the TRP; and a control unit that implements control so as to update the uplink control channel resource associated with the TRP after a beam failure recovery procedure.

Description

[Technical Field]

[0001] The present disclosure relates to a terminal and a wireless communication method in a next-generation mobile communication system. 、 base station and systems Regarding. [Background technology]

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was specified with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later) are also being considered.

[0004] In existing LTE systems (LTE Rel. 8-15), radio link quality is monitored (Radio Link Monitoring (RLM)). When a Radio Link Failure (RLF) is detected by RLM, a Radio Resource Control (RRC) connection re-establishment is requested to the user equipment (UE). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0006] In future wireless communication systems (e.g., NR), it is being considered to implement a procedure for detecting beam failure and switching to another beam (which may also be called a Beam Failure Recovery (BFR) procedure, BFR, link recovery procedure, etc.).

[0007] In NR Rel. 17 and later (or Beyond 5G, 6G, and later), it is expected that terminals will communicate using multiple transmission / reception points (TRPs) / UE panels. In this case, beam management (e.g., beam failure detection) may be performed in multiple TRPs / UE panels, but how to control beam failure detection (BFD) or beam failure recovery (BFR) in each TRP / UE panel becomes an issue. If beam failure detection or beam failure recovery in each TRP / UE panel cannot be appropriately controlled, communication throughput or communication quality may decrease.

[0008] The present disclosure has been made in consideration of the above points, and provides a terminal and a wireless communication method that are capable of appropriately detecting beam failure or recovering from beam failure even when multiple transmission / reception points are used. 、 base station and systems One of the aims is to provide [Means for solving the problem]

[0009] A terminal according to one aspect of the present disclosure includes: a transmitter for transmitting capability information regarding a number of physical uplink control channel (PUCCH) resources for scheduling requests (SRs) that can be supported in a cell group; Transmitting / Receiving Point (TRP) and the first TRP among the second TRPs If a beam obstruction is detected in 1st Associated with TRP PUCCH Riso Su Use SR's send Control do control Department and ,of Has. [Effects of the Invention]

[0010] According to one aspect of the present disclosure, beam failure detection or beam failure recovery can be performed appropriately even when multiple transmission and reception points are used. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing an example of a beam recovery procedure in Rel. 15 NR. [Figure 2] 2A to 2C are diagrams illustrating an example of setting PUCCH resources and spatial relationships for scheduling requests. [Figure 3] FIG. 3 is a diagram illustrating an example of the configuration of a BFD-RS set. [Figure 4] FIG. 4 is a diagram showing an example of a BFR procedure according to the second embodiment. [Figure 5] 5A and 5B are diagrams showing another example of a BFR procedure according to the second embodiment. [Figure 6] FIG. 6 is a diagram illustrating an example of association between a PUCCH resource for SR and a TRP according to the third aspect. [Figure 7] 7A and 7B are diagrams showing an example of a BFR procedure according to the fourth embodiment. [Figure 8] FIG. 8 is a diagram showing another example (case 4-1) of the BFR procedure according to the fourth aspect. [Figure 9]FIG. 9 is a diagram showing another example (case 4-2) of the BFR procedure according to the fourth embodiment. [Figure 10] FIG. 10 is a diagram showing another example (Case 4-3) of the BFR procedure according to the fourth aspect. [Figure 11] FIG. 11 is a diagram showing another example (case 4-1′) of the BFR procedure according to the fourth aspect. [Figure 12] FIG. 12 is a diagram showing another example (case 4-2′) of the BFR procedure according to the fourth embodiment. [Figure 13] FIG. 13 is a diagram showing another example (case 4-3′) of the BFR procedure according to the fourth embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 15] FIG. 15 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 16] FIG. 16 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 17] FIG. 17 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] (Beam obstruction detection) In NR, communication is performed using beamforming. For example, a UE and a base station (e.g., a gNB (gNodeB)) may use a beam used to transmit a signal (also called a transmit beam or Tx beam) and a beam used to receive a signal (also called a receive beam or Rx beam).

[0013] When beamforming is used, it is expected that radio link quality will deteriorate due to increased susceptibility to interference from obstacles. This deterioration in radio link quality may lead to frequent radio link failures (RLF). Since RLF requires cell reconnection, frequent RLF occurrences will result in a degradation of system throughput.

[0014] In NR, in order to suppress the occurrence of RLF, when the quality of a specific beam deteriorates, a procedure for switching to another beam (which may also be called Beam Recovery (BR), Beam Failure Recovery (BFR), or L1 / L2 (Layer 1 / Layer 2) beam recovery) is performed. The BFR procedure may also be simply called BFR.

[0015] Note that a beam failure (BF) in this disclosure may also be referred to as a link failure.

[0016] Figure 1 shows an example of a beam recovery procedure in Rel.15 NR. The number of beams is merely an example and is not limited to this. In the initial state (step S101) of Figure 1, the UE performs measurements based on Reference Signal (RS) resources transmitted using two beams.

[0017] The RS may be at least one of a Synchronization Signal Block (SSB) and a Channel State Information RS (CSI-RS). The SSB may also be called an SS / PBCH (Physical Broadcast Channel) block.

[0018] The RS may be at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Mobility Reference Signal (MRS), a signal included in an SSB, an SSB, a CSI-RS, a Demodulation Reference Signal (DMRS), a beam-specific signal, etc., or a signal configured by extending or modifying any of these. The RS measured in step S101 may also be called an RS for beam failure detection (Beam Failure Detection RS (BFD-RS)), an RS for use in a beam recovery procedure (BFR-RS), etc.

[0019] In step S102, the UE cannot detect the BFD-RS (or the reception quality of the RS is degraded) due to radio wave jamming from the base station. Such jamming can be caused by, for example, obstacles, fading, interference, etc. between the UE and the base station.

[0020] The UE detects a beam failure when a predetermined condition is met. The UE may detect the occurrence of a beam failure, for example, when the Block Error Rate (BLER) is less than a threshold for all configured BFD-RS (BFD-RS resource configurations). When the occurrence of a beam failure is detected, the lower layer (physical (PHY) layer) of the UE may notify (indicate) a beam failure instance to the upper layer (MAC layer).

[0021] The criteria for the determination are not limited to BLER, but may be Layer 1 Reference Signal Received Power (L1-RSRP) in the physical layer. Also, instead of or in addition to RS measurement, beam failure detection may be performed based on a downlink control channel (PDCCH). The BFD-RS may be expected to be quasi-co-located (QCL) with the DMRS of the PDCCH monitored by the UE.

[0022] Here, QCL is an index that indicates the statistical properties of a channel. For example, if a signal / channel and another signal / channel have a QCL relationship, it may mean that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same between these different signals / channels (i.e., they are QCLs with respect to at least one of these).

[0023] The spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be determined based on a spatial QCL. A QCL (or at least one element of a QCL) in the present disclosure may be replaced with an sQCL (spatial QCL).

[0024] Information about BFD-RS (e.g., RS index, resource, number, number of ports, precoding, etc.), information about beam fault detection (BFD) (e.g., the above-mentioned threshold), etc. may be configured (notified) to the UE using higher layer signaling, etc. Information about BFD-RS may also be referred to as information about BFR resources, etc.

[0025] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, or a combination thereof.

[0026] The MAC signaling may use, for example, a Media Access Control Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0027] When a higher layer (e.g., MAC layer) of the UE receives a beam failure instance notification from the PHY layer of the UE, it may start a predetermined timer (which may be called a beam failure detection timer). If the MAC layer of the UE receives a certain number of beam failure instance notifications (e.g., beamFailureInstanceMaxCount configured by RRC) before the timer expires, it may trigger a BFR (e.g., start one of the random access procedures described below).

[0028] If there is no notification from the UE, or if the base station receives a predetermined signal (beam recovery request in step S104) from the UE, the base station may determine that the UE has detected a beam failure.

[0029] In step S103, the UE starts searching for a new candidate beam to be used for new communication in order to recover the beam. The UE may select a new candidate beam corresponding to a predetermined RS by measuring the RS. The RS measured in step S103 may be called a new candidate RS, a new candidate beam identification RS (NCBI-RS), a CBI-RS, a CB-RS (Candidate Beam RS), or the like. The NCBI-RS may be the same as or different from the BFD-RS. The new candidate beam may also be simply called a candidate beam or candidate RS.

[0030] The UE may determine a beam corresponding to an RS that satisfies a predetermined condition as a new candidate beam. The UE may determine a new candidate beam, for example, based on an RS whose L1-RSRP exceeds a threshold among the configured NCBI-RSs. Note that the criteria for determination are not limited to L1-RSRP. The L1-RSRP for SSB may be called SS-RSRP. The L1-RSRP for CSI-RS may be called CSI-RSRP.

[0031] Information about the NCBI-RS (e.g., RS resources, number of ports, precoding, etc.), information about the new candidate beam identification (NCBI) (e.g., the above-mentioned threshold), etc. may be configured (notified) to the UE using higher layer signaling, etc. Information about the new candidate RS (or NCBI-RS) may be acquired based on information about the BFD-RS. Information about the NCBI-RS may be referred to as information about NBCI resources, etc.

[0032] Note that BFD-RS, NCBI-RS, etc. may be read as Radio Link Monitoring RS (RLM-RS).

[0033] In step S104, the UE that has identified the new candidate beam transmits a beam failure recovery request (BFRQ). The beam recovery request may also be called a beam recovery request signal, a beam failure recovery request signal, or the like.

[0034] The BFRQ may be transmitted using, for example, at least one of an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and a configured grant (CG) PUSCH.

[0035] The BFRQ may include information of the new candidate beam / new candidate RS identified in step S103. Resources for the BFRQ may be associated with the new candidate beam. The beam information may be notified using a beam index (BI), a port index of a predetermined reference signal, an RS index, a resource index (e.g., a CSI-RS resource indicator (CRI) or an SSB resource indicator (SSBRI)), etc.

[0036] In Rel. 15 NR, contention-based BFR (CB-BFR), which is a BFR based on a contention-based random access (RA) procedure, and contention-free BFR (CF-BFR), which is a BFR based on a contention-free random access procedure, are under consideration. In CB-BFR and CF-BFR, a UE may transmit a preamble (also referred to as an RA preamble, a random access channel (Physical Random Access Channel (PRACH)), a RACH preamble, etc.) as a BFRQ using a PRACH resource.

[0037] In CB-BFR, a UE may transmit a preamble randomly selected from one or more preambles. In CF-BFR, a UE may transmit a preamble assigned specifically to the UE by the base station. In CB-BFR, a base station may assign the same preamble to multiple UEs. In CF-BFR, a base station may assign a preamble individually to each UE.

[0038] Note that CB-BFR and CF-BFR may be referred to as CB PRACH-based BFR (CBRA-BFR) and CF PRACH-based BFR (CFRA-BFR), respectively. CBRA-BFR may be referred to as CBRA for BFR. CFRA-BFR may be referred to as CFRA for BFR.

[0039] Regardless of whether CB-BFR or CF-BFR is used, information about the PRACH resource (RA preamble) may be notified by, for example, higher layer signaling (such as RRC signaling). For example, the information may include information indicating a correspondence relationship between the detected DL-RS (beam) and the PRACH resource, and a different PRACH resource may be associated with each DL-RS.

[0040] In step S105, the base station that has detected the BFRQ transmits a response signal (which may be referred to as a gNB response, etc.) to the BFRQ from the UE. The response signal may include reconfiguration information (e.g., DL-RS resource configuration information) for one or more beams.

[0041] The response signal may be transmitted, for example, in the UE common search space of the PDCCH. The response signal may be signaled using a PDCCH (DCI) scrambled with a cyclic redundancy check (CRC) by a UE identifier (e.g., a Cell-Radio RNTI (C-RNTI)). The UE may determine at least one of a transmit beam and a receive beam to use based on the beam reconfiguration information.

[0042] The UE may monitor the response signal based on at least one of a control resource set (CORESET) for BFR and a search space set for BFR.

[0043] For CB-BFR, contention resolution may be determined to be successful if the UE receives a PDCCH corresponding to the C-RNTI associated with the UE.

[0044] Regarding the process of step S105, a period for the UE to monitor a response to the BFRQ from a base station (e.g., a gNB) may be set. This period may be referred to as, for example, a gNB response window, a gNB window, a beam recovery request response window, etc. If no gNB response is detected within this window period, the UE may retransmit the BFRQ.

[0045] In step S106, the UE may transmit a message indicating that the beam reconfiguration is complete to the base station. The message may be transmitted, for example, via the PUCCH or the PUSCH.

[0046] A beam recovery success (BR success) may indicate, for example, that step S106 has been reached, whereas a beam recovery failure (BR failure) may indicate, for example, that a predetermined number of BFRQ transmissions have been made or that a beam-failure-recovery-timer has expired.

[0047] Rel. 15 supports the use of a random access procedure to perform beam recovery procedures (e.g., BFRQ notification) in response to beam failure detected in an SpCell (PCell / PSCell).

[0048] On the other hand, Rel. 16 supports performing a beam recovery procedure (e.g., BFRQ notification (step S104 in FIG. 1)) for a beam failure detected in an SCell using at least one of a PUCCH (e.g., a scheduling request (SR)) transmission for BFR and a MAC CE (e.g., an UL-SCH) transmission for BFR. For example, a UE may transmit information about the beam failure using two steps based on MAC CE. The information about the beam failure may include information about the cell that detected the beam failure and information about a new candidate beam (or a new candidate RS index).

[0049] [Step 1] If a BF is detected, a PUCCH-BFR (scheduling request (SR)) may be transmitted from the UE to an SpCell (e.g., PCell / PSCell). The PUCCH-BFR may also be referred to as a PUCCH-SR, a PUCCH-SR for BFR, or a PUCCH for SR.

[0050] Next, the PCell / PSCell may transmit an UL grant (e.g., DCI) to the UE for the following step 2. When a beam failure is detected and there is a MAC CE (or UL-SCH) for transmitting information about a new candidate beam, step 1 (e.g., PUCCH transmission) may be omitted and step 2 (e.g., MAC CE transmission) may be performed.

[0051] [Step 2] The UE may transmit information about the cell in which beam failure has been detected (failed) (e.g., cell index) and information about the new candidate beam to the base station (PCell / PSCell) via an uplink channel (e.g., PUSCH) using MAC CE. After that, through the BFR procedure, the QCL of the PDCCH / PUCCH / PDSCH / PUSCH may be updated to the new beam after a predetermined period (e.g., 28 symbols) has elapsed since receiving a response signal from the base station.

[0052] Note that the numbers of these steps are for explanatory purposes only, and multiple steps may be combined or the order may be reversed. Furthermore, whether to perform BFR may be configured in the UE using higher layer signaling.

[0053] Incidentally, in future wireless communication systems (e.g., Rel. 17 and later), beam management for UEs with multiple panels (multi-panels) or extension of beam management using multiple transmission / reception points (multi-Transmission / Reception Points (TRPs)) is being considered.

[0054] It is also assumed that beam failure detection / beam failure recovery in Rel. 17 and later will support a BFRQ framework based on the SCell BFR BFRQ of Rel. 16. In this case, up to X PUCCH-SR resources (e.g., dedicated PUCCH-SR resources) may be configured for a UE (e.g., X for each cell group). X may be 1, 2, or greater than 2. PUCCH-SR resources may be interpreted as PUCCH resources for SR.

[0055] In the present disclosure, a cell group may be, for example, at least one of a master cell group (MCG), a secondary cell group (SCG), and a PUCCH cell group. The MCG and SCG may be groups configured in dual connectivity (DC). The PUCCH group may be a group configured in PUCCH transmission. The PUCCH group may include at least a PCell / PSCell from which PUCCH transmission is performed, or an SCell (also referred to as a PUCCH SCell) from which PUCCH transmission is performed. In the following description, a cell group may be read as a PUCCH group.

[0056] In Rel. 17 and later, it is possible to perform beam fault detection / beam fault recovery for each TRP / UE panel in a cell (e.g., per-TRP BFR). This may also be called a TRP-specific BFR.

[0057] When a BFR procedure (e.g., transmission of a scheduling request (SR)) per TRP is supported, the question arises as to how to control the configuration of the scheduling request (e.g., SR configuration).

[0058] For example, the problem is how to control the setting of SR (e.g., SR index / SchedulingRequestID / SR ID) and the setting of PUCCH resources (e.g., PUCCH resources for SR) for a cell group (or cell / BWP / TRP). Alternatively, when BFR per TRP is supported, if a beam failure is detected per TRP / per cell (e.g., if SR is triggered), the problem is how to control the PUCCH for SR used to transmit SR / the cell / TRP transmitting SR.

[0059] The inventors focused on cases where beam failure recovery procedures (beam failure detection / beam failure recovery request / UE operation based on beam failure recovery) are applied in units of one or more TRPs / panels, and considered SR setting / SR transmission control in such cases, resulting in the concept of this embodiment.

[0060] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Each aspect may be applied alone or in combination.

[0061] In the present disclosure, a UE may be a UE that uses multiple panels to transmit and receive data to and from a TRP, where each panel may correspond to a different TRP, one panel may correspond to multiple TRPs, or multiple panels may correspond to one TRP.

[0062] In this disclosure, a UE's panel (or panel index) may correspond to a particular group. In this case, the UE may assume that beams / RSs of each group are measured on each panel of the UE. The UE may assume that it receives beams of multiple groups simultaneously (using different panels).

[0063] In the present disclosure, TRP may be interchangeably read as a panel of TRPs (or base stations), an RS group, an antenna port group, a spatial relationship group, a QCL group, a TCI state, a TCI state group, a CORESET group, a CORESET pool, etc. Also, a TRP index may be interchangeably read as an RS group index, an antenna port group index, a QCL group index, a TCI state index, a TCI state group index, a CORESET group index, a CORESET pool index, etc.

[0064] In the present disclosure, TRP#1 and TRP#2 may be interpreted as CORESET pool index#1 and CORESET pool index#2, BFD-RS set#1 and BFD-RS set#2, or TCI state#1 and TCI state#2. Also, the association between the PUCCH resource for SR and the TRP may be interpreted as the association between the PUCCH resource for SR and the BFD-RS (BFD-RS set).

[0065] In the present disclosure, a panel of UEs may be interchangeably read as an RS group, an antenna port group, a spatial relationship group, a QCL group, a TCI state group, a CORESET group, and the like.

[0066] In the present disclosure, a panel may be associated with a group index of an SSB / CSI-RS group. Also, in the present disclosure, a panel may be associated with a TRP. Also, in the present disclosure, multiple panels may be associated with a group index for group beam-based reporting. Also, in the present disclosure, a panel may be associated with a group index of an SSB / CSI-RS group for group beam-based reporting.

[0067] In the present disclosure, the serving cell / cell may be replaced with a PCell, a PSCell, an SpCell, or an SCell. In the following description, a case where two TRPs correspond to a serving cell is taken as an example, but three or more TRPs may correspond to a serving cell.

[0068] In the present disclosure, the terms BFD RS in which a beam failure has been detected, failed BFD RS, TRP in which a beam failure has been detected, failed TRP, UE panel in which a beam failure has been detected, and failed UE panel may be read as interchangeable.

[0069] In the present disclosure, A / B may be read as at least one of A and B, or A and B. In the present disclosure, A / B / C may be read as at least one of A, B, and C.

[0070] (SR setting example) The SR setting may support at least one of the following options: 0, 1, or 2.

[0071] <Option 0> X0 PUCCH resources (or PUCCHs for SR) are configured for an SR (for example, an SR index / SchedulingRequestID) in a cell group, and Y0 spatial relationships are configured for the PUCCH resources. In the following description, it is assumed that X0=1 and Y0=1 (see FIG. 2A).

[0072] 2A shows a case where one PUCCH resource for SR (here, PUCCH resource for SR #1) is configured for an SR configured in a cell group (or SpCell), and one spatial relationship (here, spatial relationship #1) is configured for the PUCCH resource for SR. Note that the numbers of X0 and Y0 are not limited to this.

[0073] The SR configuration method for SCell BFR in Rel. 16 may be applied to Option 0. Option 0 may be read as 0th SR / 0th SR configuration.

[0074] <Option 1> A maximum of X1 PUCCH resources (e.g., dedicated PUCCH-SR resources) are configured in a cell group for each SR (e.g., SR index / SchedulingRequestID), and Y1 spatial relationships are configured for the PUCCH resources. In the following description, it is assumed that X1=1 and Y1=2 (see FIG. 2B).

[0075] 2B shows a case where one PUCCH resource for SR (here, PUCCH resource for SR #1) is configured for an SR configured in a cell group (or SpCell), and two spatial relationships (here, spatial relationships #1 and #2) are configured for the PUCCH resource for SR. Note that the numbers of X1 and Y1 are not limited to this. Option 1 may be interpreted as a first SR / first SR configuration.

[0076] <Option 2> A maximum of X2 PUCCH resources (e.g., dedicated PUCCH-SR resources) are configured in a cell group for each SR (e.g., SR index / SchedulingRequestID), and Y2 spatial relationships are configured for each PUCCH resource. In the following description, it is assumed that X2=2 (or 2 or more) and Y2=1 (see FIG. 2C).

[0077] FIG. 2C shows a case where two PUCCH resources for SR (SR PUCCH resources #1 and #2 in this case) are configured for an SR configured in a cell group (or SpCell), and one spatial relationship (spatial relationship #1 and #2 in this case) is configured for each PUCCH resource for SR. FIG. 2C shows a case where different spatial relationships are configured for PUCCH resource #1 for SR and PUCCH resource #2 for SR, but the same spatial relationship may also be configured. Note that the numbers of X2 and Y2 are not limited to these. Option 2 may be interpreted as a second SR / second SR configuration.

[0078] The UE may receive at least one of the following information from the network (e.g., base station) using higher layer signaling / DCI: information about SRs in a cell group (e.g., SR index / SchedulingRequestID), information about PUCCH resources in a cell group (e.g., PUCCH-SR resources), and information about spatial relations (e.g., spatial relations) set for PUCCH resources.

[0079] The information about SR may be at least one of information indicating an SR index (or SchedulingRequestID) to be set and information indicating the number of SRs to be set. The information about PUCCH resources in a cell group may be at least one of information indicating PUCCH resources and information indicating the number of PUCCH resources to be set. The information about spatial relations may be at least one of information indicating spatial relations and information indicating the number of spatial relations to be set. In the present disclosure, spatial relations (e.g., spatial relation), beams, spatial filters, spatial domain filters, TCI states, and QCLs may be interchangeable.

[0080] Furthermore, the UE may receive information about the configuration of BFR for each TRP for each cell (for example, a cell included in a cell group) from the network (for example, a base station) using higher layer signaling / DCI. The information about the configuration of BFR for each TRP may be information indicating whether or not BFR for each TRP is configured / applied. Alternatively, the information about the configuration of BFR for each TRP may be information indicating a TRP type (TRP-based BFR or cell-specific BFR).

[0081] The UE may control transmission of SR or PUCCH-SR based on at least one of the number of SRs (or the number of SR indices) configured for each cell group and the BFR type configured / applied to a specific cell included in the cell group (e.g., BFR per TRP / BFR per cell). In this case, the UE may control transmission of SR or PUCCH for SR (PUCCH-SR) based on at least one of the number of PUCCH resources configured and the number of spatial relations configured (or corresponding) to the PUCCH resources.

[0082] (Selection of PUCCH resource for SR) When beam failure is applied / configured for each TRP, how to control the PUCCH resource for SR becomes an issue. When beam failure is detected in a certain TRP (for example, the received power of the BFD-RS / BFD-RS set is below a predetermined threshold), at least one of the following selection methods 1 to 3 may be applied to select the PUCCH resource for SR. Hereinafter, BFD-RS and BFD-RS set may be read interchangeably.

[0083] <Selection Method 1> The PUCCH resource for SR associated with a BFD-RS set other than the BFD-RS set in which beam failure is detected may be referred to as the BFD-RS set in which beam failure is not detected / is not below a predetermined threshold (e.g., other / non-failed BFD-RS set).

[0084] <Selection Method 2> The PUCCH resource for SR associated with the BFD-RS set in which a beam failure is detected is selected. The BFD-RS set in which a beam failure is detected may be referred to as a BFD-RS set (e.g., a failed BFD-RS set) that is below a predetermined threshold (or equal to or less than a predetermined threshold).

[0085] <Selection Method 3> The PUCCH resource for SR is selected by the UE (UE implementation).

[0086] (BFD-RS set configuration) A BFD-RS set may include one or multiple (e.g., two) BFD-RSs. In Rel. 17 and later, it is assumed that multiple (e.g., two) BFD-RS sets will be supported in BFR per TRP (see Figure 3). Figure 3 shows a case where two BFD-RS sets are configured for TRP#1 and one BFD-RS set is configured for TRP#2. A BFD-RS set may be configured for each BWP / cell.

[0087] If BFD-RS for per-TRP BFR (e.g., TRP-specific BFR) is supported, the total number of RSs in multiple (e.g., two) BFD-RS sets per DL BWP may be determined based on UE capabilities. The maximum number of RSs per BFD-RS set may be a predetermined value (e.g., two) or may be determined based on UE capabilities.

[0088] As a beam failure detection criterion for each BFD-RS set, the UE (e.g., the physical layer of the UE) may measure / evaluate the radio link quality for each BFD-RS set, and if the virtual PDCCH BLER of all BFD-RSs in the corresponding BFD-RS set is higher than a predetermined threshold, may indicate the index of the BFD-RS set to the upper layer at a predetermined period (e.g., X ms).

[0089] For a UE configured with a BFR for each TRP (for example, a TRP-specific BFR), one PUCCH resource for SR may be configured within a cell group. Alternatively, a maximum of multiple (for example, two) PUCCH resources for SR may be configured within a cell group.

[0090] Assume that two PUCCH resources for SR are configured and a beam failure is detected in a maximum of one BFD-RS set per cell (or the BFD-RS set fails). In this case, in the selection rule for the PUCCH resource for SR, if all BFD-RS sets in which a beam failure is detected between cells are associated with the same PUCCH resource for SR, the above selection method 1 or selection method 2 is used, and in other cases, selection method 3 may be adopted.

[0091] (First aspect) In a first aspect, selection of PUCCH resources for SR is described when PUCCH resource updating after a TRP-based BFR (eg, multi-TRP BFR) procedure is supported.

[0092] After the BFR procedure is completed (for example, after BFR completion), not only the PUCCH resource for SR but also other PUCCH resources related to the TRP where beam failure is detected / TRP where beam failure is not detected may be updated to the PUCCH resource corresponding to q_new. q_new may be an RS (or an RS index) corresponding to a new candidate beam identified in the BFR procedure for each TRP.

[0093] When considering updating of PUCCH resources after the BFR procedure, a PUCCH resource for SR associated with a BFD-RS set other than the BFD-RS set in which a beam failure is detected may be selected as the PUCCH resource for SR in the BFR procedure (selection method 1). Alternatively, when a PUCCH resource for SR not associated with any BFD-RS set is configured, the PUCCH resource for SR may be selected.

[0094] For example, assume that a TRP ID / CORESET pool ID is configured for each PUCCH resource, and a beam failure is detected (or fails) for a certain TRP ID / CORESET pool ID.

[0095] More specifically, it is assumed that the first PUCCH resource for SR #0 is set to TRP ID / CORESET pool ID = 0, and the second PUCCH resource for SR #1 is set to TRP ID / CORESET pool ID = 1. It is also assumed that a beam failure is detected (or fails) when TRP ID / CORESET pool ID = 0.

[0096] <Cases where Selection Method 1 is applied> When selection method 1 is applied as the SR PUCCH resource selection rule, the UE selects SR PUCCH resource #1 and controls SR transmission, etc. The base station may set spatial relationship #1 to SR PUCCH resource #1 in advance. Spatial relationship #1 may be configured to be transmitted to TRP #1.

[0097] After the base station responds with BFR completion, a spatial relation updating rule may be applied. For example, a PUCCH / PUCCH resource for SR that is not used for SR transmission from the UE (here, PUCCH resource #0) may be updated to q_new (or a PUCCH resource corresponding to q_new).

[0098] As a result, the PUCCH resources not used for SR transmission (PUCCH resources associated with the BFD-RS / TRP in which the beam failure was detected) are updated. Also, when considering the update control of the spatial relationship of PUCCH after the completion of BFR, by applying selection method 1, it is sufficient to update the PUCCH / PUCCH resources for SR not used for SR transmission (or the PUCCH / PUCCH resources for SR associated with the TRP in which the beam failure occurred).

[0099] <Cases where selection method 2 is applied> When selection method 2 is applied as the SR PUCCH resource selection rule, the UE selects SR PUCCH resource #0 and controls SR transmission, etc. The base station may set spatial relationship #1 to SR PUCCH resource #0 in advance. Spatial relationship #1 may be configured to be transmitted to TRP #1.

[0100] After the base station responds with BFR completion, a spatial relation updating rule may be applied. For example, a PUCCH / PUCCH resource for SR that is not used for SR transmission from the UE (here, PUCCH resource #1) may be updated to q_new (or a PUCCH resource corresponding to q_new).

[0101] In selection method 2, the PUCCH resources not used for SR transmission are the PUCCH resources associated with BFD-RS / TRPs for which no beam failure is detected. Therefore, when selection method 2 is applied, it is necessary to support updating the PUCCH resources for PUCCH / SR associated with TRPs for which no beam failure is detected (or which have not failed) after BFR completion.

[0102] Alternatively, when selection method 2 is applied, a configuration may be adopted in which the PUCCH resource for SR used for SR transmission is updated after BFR is completed.

[0103] (Second aspect) In the second aspect, an example of a BFR procedure in a case where the TRPs set between cells are different will be described.

[0104] When multiple cells are configured in the UE, the TRP may be configured separately for each cell. In addition, whether or not BFR is applied on a TRP basis may be configured commonly or separately within a cell / between cells.

[0105] For example, a UE may be configured / applied with multiple (e.g., two) TRPs in a first cell and one TRP in a second cell.

[0106] FIG. 4 shows a case where a first cell and a second cell are configured for a UE, and TRP#1 and TRP#2 are configured for the first cell, and TRP#2 is configured for the second cell (for example, TRP#1 is not configured in the second cell, or TRP#1 is turned off). Note that the TRP configured for the second cell may be TRP#3. Here, a case is shown where the first cell is an SpCell (for example, a PCell / PSCell) and the second cell is an SCell. Note that the first cell and the second cell are not limited to this.

[0107] In the following description, the second cell may belong to the same cell group as the PCell. The cell group may be a PUCCH group (for example, the UCI of the second cell is transmitted using the PUCCH of the first cell). Alternatively, the second cell may be a PUCCH-SCell capable of PUCCH transmission (or the first cell and the second cell may belong to different PUCCH cell groups). Alternatively, the first cell may be a PUCCH-SCell, and the second cell may be an SCell that belongs to the same cell group as the PUCCH-SCell.

[0108] In Figure 4, two TRPs are configured in the first cell. Therefore, the configuration of one or two BFD-RS sets may be supported in the first cell. Meanwhile, one TRP is configured in the second cell (TRP#1 is not configured or TRP#1 is off). Therefore, the configuration of one BFD-RS set may be supported (or the configuration of two BFD-RS sets may not be supported) in the second cell.

[0109] In this way, by supporting a configuration in which TRPs are set / applied / enabled for each cell separately, it is possible to maximize throughput in millimeter waves (mmWave). For example, when TRP#1 on a SCell is off, only TRP#2 may exist on that SCell.

[0110] In this way, when one TRP is configured / applied in a certain cell (SCell in FIG. 4), if a beam failure is detected (or SR is triggered) in the TRP in the SCell, the UE may control the TRP in another cell (PCell / PSCell in FIG. 4) to transmit the PUCCH for SR. In one example, a case is shown in which the UE transmits the PUCCH for SR to TRP#1 of the first cell.

[0111] When a UE detects a beam failure on a TRP basis in a cell, the UE may control transmission of the SR / SR-use PUCCH based on whether there is another TRP (or a non-failed TRP) in which a beam failure is not detected in the cell. The UE may control to perform beam failure detection on a TRP basis (or beam failure recovery on a TRP basis) when a predetermined higher layer parameter is configured or when a BFD-RS on a TRP basis is configured.

[0112] If beam failure is detected in one TRP (e.g., one TRP index) or if beam failure is detected for only one BFD-RS set, the UE may be controlled to transmit a PUCCH for SR to a TRP where beam failure is not detected.

[0113] In this case, if there is another TRP (for example, a TRP where no beam failure is detected) in the cell where the beam failure in the TRP unit is detected, the UE may transmit the PUCCH for SR in that cell (see FIG. 5A). FIG. 5A shows a case where a beam failure is detected in TRP#2 of the first cell, and the PUCCH for SR is transmitted to another TRP (here, TRP#1) of the first cell.

[0114] If there is no other TRP (for example, a TRP where no beam failure is detected) in the cell where beam failure is detected for each TRP, the UE may transmit the PUCCH for SR in another cell (see FIG. 5B). FIG. 5B shows a case where beam failure is detected in TRP#2 of the second cell and the PUCCH for SR is transmitted to the TRP (TRP#1 in this case) of the first cell. Note that the PUCCH for SR may be allowed to be transmitted to TRP#2 of the first cell.

[0115] In this way, when the TRPs that are set / applied / turned on for each cell are set separately, SR transmission can be performed appropriately in a cell in which beam failure on a TRP basis is detected by controlling SR transmission depending on whether or not there are other TRPs in which beam failure is not detected.

[0116] (Third aspect) In the third example, a configuration example of PUCCH resources for SR will be described.

[0117] The UE may be configured with one or more (e.g., two) PUCCH resources for SR for BFR in TRP units. One or more (e.g., two) spatial relationships may be configured for the PUCCH resources for SR. The PUCCH resource for SR may be interpreted as a PUCCH for SR, a PUCCH set for SR, or a PUCCH resource set for SR.

[0118] The PUCCH resource for SR may be configured for at least one of an SpCell (for example, a PCell / PSCell) and a PUCCH-SCell. Alternatively, the PUCCH resource for SR may be configured for a cell group.

[0119] If a PUCCH in an SCell (PUCCH on SCell or PUCCH-SCell) is not configured, the UE may transmit a PUCCH for SR to the SpCell regardless of whether or not a beam failure per TRP is detected in any cell (or even if a beam failure per TRP is detected in any cell).

[0120] When a PUCCH in an SCell (PUCCH on an SCell or PUCCH-SCell) is not configured, the transmission of the PUCCH for SR may be controlled taking into consideration the cell in which a beam failure in TRP unit is detected.

[0121] For example, when a beam failure in a TRP unit is detected in an SpCell, the UE may control the transmission of the PUCCH for SR to the SpCell. Also, when a beam failure in a TRP unit is detected in an SCell, the UE may control the transmission of the PUCCH for SR to a PUCCH-SCell. The SCell may be an SCell that belongs to the same PUCCH group as the PUCCH-SCell.

[0122] The association between the TRP index and the PUCCH resource (for example, the PUCCH resource for SR) may be set explicitly / implicitly.

[0123] The TRP index may be configured to be set for each PUCCH resource. For example, the PUCCH resource and the TRP index may be associated and set in the same upper layer parameter.

[0124] The TRP index may be configured separately from the PUCCH resource (see Figure 6). Figure 6 shows a case where the PUCCH resource index and the associated TRP index are configured / notified / activated by the RRC / MAC CE.

[0125] The TRP index may be replaced with a CORESET pool ID.

[0126] If the association between a PUCCH resource and a TRP index is not configured, it may mean that the PUCCH resource is not associated with a specific TRP. The PUCCH resource may be applied to a cell-based BFR (e.g., per cell BFR) / TRP-based BFR.

[0127] Alternatively, the PUCCH resource may be associated with a BFD-RS set (or a BFD-RS), and the BFD-RS set may be associated with a TRP (or a CORESET pool ID).

[0128] (Fourth aspect) In the fourth example, when BFR is performed in units of TRPs, a case will be described in which a PUCCH resource for SR that is not associated with a TRP in which a beam failure is detected is preferentially selected / applied.

[0129] Assume that multiple (e.g., two) PUCCH resources for SR are configured and SR transmission is triggered. In this case, the UE may select a PUCCH resource for SR that is not associated with a TRP in which a beam failure is detected (or a failed TRP) to control SR transmission. In other cases (e.g., when there is no PUCCH resource for SR that is not associated with a TRP in which a beam failure is detected), the UE may autonomously select a PUCCH resource for SR (UE implementation).

[0130] When the UE finds / recognizes at least one of a PUCCH resource for SR associated with a TRP (or a non-failed TRP) in which beam failure has not been detected and a PUCCH resource for SR that is not associated with a TRP, the UE may select the PUCCH resource for SR.

[0131] Fig. 7A shows a case where no TRP is associated with the PUCCH resource #1 for SR, and TRP #2 is associated with the PUCCH resource #2 for SR. The association between the PUCCH resource for SR and the TRP (including whether there is an association) may be set / activated for the UE by RRC / MAC CE.

[0132] Fig. 7B shows a case where two TRPs (here, TRP #1 and TRP #2) are set / applied / turned on in the first cell (e.g., SpCell), and one TRP (here, TRP #2) is set / applied / turned on in the second cell (e.g., SCell).

[0133] When a beam failure is detected for TRP #2 of the SCell (or an SR is triggered), the UE may be controlled to transmit the PUCCH for SR to the TRP of the first cell #1. In this case, the UE may preferentially select the PUCCH resource for SR that is not associated with TRP #2 (here, the PUCCH resource #1 for SR) as the PUCCH resource to be used for the transmission of SR.

[0134] Thereby, even when different TRPs / different PUCCH resources for SR are set for each cell and the BFR per TRP is applied, the PUCCH resource can be appropriately updated after the PUCCH transmission / BFR procedure for SR.

[0135] <Configuration of PUCCH Resource for SR> The PUCCH resource for SR may be configured for each cell / CC (or for each TRP).

[0136] <Case 4-1> 8 illustrates a case where multiple (here, two) PUCCH resources for SR #1-1 and #1-2 are configured for a first cell, and multiple (here, two) PUCCH resources for SR #2-1 and #2-2 are configured for a second cell. Here, two TRPs (here, TRP #1 and TRP #2) are configured / applied / turned on in the first cell (e.g., SpCell), and one TRP (here, TRP #2) is configured / applied / turned on in the second cell (e.g., SCell).

[0137] Also, a case is shown in which SR PUCCH resource #1-1 is associated with TRP #1, and SR PUCCH resource #1-2 is associated with TRP #2. Also, a case is shown in which SR PUCCH resource #2-1 is not associated with a TRP, and SR PUCCH resource #2-2 is associated with TRP #2.

[0138] The UE may be notified of information about the PUCCH resource for SR configured in each cell from the base station by RRC / MAC CE / DCI. Also, the UE may be notified of information about the association between the PUCCH resource for SR configured in each cell and the TRP (which may include information about the presence or absence of the association) from the base station by RRC / MAC CE / DCI.

[0139] When a beam failure is detected in a cell, the PUCCH resource for SR associated with the cell (or failed CC) in which the beam failure is detected may be selected / transmitted (e.g., selected / transmitted preferentially).

[0140] For example, in FIG. 8, assume that a beam failure (TRP-based BFR) is detected in TRP#2 of the second cell. In this case, the UE may preferentially select / use the SR PUCCH resource (SR PUCCH resource #2-1 / #2-2) associated / corresponding to the second cell. Here, the UE selects / applies the SR PUCCH resource #2-1, which is not associated with TRP#2 in which a beam failure is detected, to transmit the SR PUCCH to TRP#1 of the first cell, but this is not limiting. The SR PUCCH resource #2-2 may also be selected / applied.

[0141] <Case 4-2> In Figure 8, in multiple (here, two) cells, a TRP is set (or BFR in TRP unit is applied), but this is not limited to this. For example, a configuration may be adopted in which a TRP is not set (or BFR in TRP unit is not applied) in a certain cell (for example, a second cell) (see Figure 9).

[0142] 9 illustrates a case where two TRPs (here, TRP#1 and TRP#2) are configured / applied / on in a first cell (e.g., SpCell) and no TRP (or TRP index) is configured in a second cell (e.g., SCell). In this case, multiple (here, two) SR PUCCH resources #1-1 and #1-2 may be configured for the first cell, and one SR PUCCH resource #2-1 may be configured for the second cell.

[0143] PUCCH resource #1-1 for SR is associated with TRP #1, PUCCH resource #1-2 for SR is associated with TRP #2, and PUCCH resource #2-1 for SR is not associated with a TRP.

[0144] For example, in FIG. 9, it is assumed that a beam failure (cell-based BFR) is detected in the second cell. In this case, the UE may preferentially select / use the SR PUCCH resource #2-1 related / corresponding to the second cell to transmit the SR PUCCH. Furthermore, the UE may control the SR PUCCH resource to be transmitted to the TRP (here, TRP #1) of the first cell.

[0145] This makes it possible to appropriately transmit the PUCCH for SR even when a cell-based BFR is detected.

[0146] <Case 4-3> In a certain cell, a TCI state / QCL assumption (for example, a TCI-state / QCL assumption) and a PUCCH resource for SR may be configured in association with each other (see FIG. 10).

[0147] Figure 10 shows a case where two TRP-based BFRs (here, TRP#1 and TRP#2) are configured / applied in a first cell (e.g., SpCell), and no TRP-based BFRs are configured (or a cell-based BFR is configured) in a second cell (e.g., SCell).

[0148] A plurality of (here, two) PUCCH resources for SR #1-1 and #1-2 may be configured for the first cell, and two PUCCH resources for SR #2-1 and #2-2 may be configured for the second cell.

[0149] For example, a first cell (here, SpCell) is a multi-TRP NCJT, and a second cell (here, SCell) is a single-TRP cell. The UE may assume that a single TRP transmits all TCI states in the SCell. The NW may support different TRPs transmitting different TCI states. In this case, the dynamic TCI state indication may refer to dynamic point selection.

[0150] Here, SR PUCCH resource #1-1 is associated with TRP #1, and SR PUCCH resource #1-2 is associated with TRP #2. Also, SR PUCCH resource #2-1 is associated with a first TCI state / QCL (TCI states #0 to #31 here), and SR PUCCH resource #2-2 is associated with a second TCI state / QCL (TCI states #32 to #63 here).

[0151] When a beam failure is detected in the second cell, the UE cannot know which TRP is associated with the TRP in which the beam failure was detected (or the failed TRP).

[0152] Therefore, when the UE detects a beam failure of a BFD-RS in a cell (e.g., a second cell) in which BFR per TRP is not configured, the UE may select / apply a PUCCH resource for SR to control SR transmission based on a predetermined TCI state associated with the BFD-RS in which the beam failure was detected. For example, the UE may select / apply a PUCCH resource for SR that is not associated with a predetermined TCI state. Alternatively, the UE may select / apply a PUCCH resource for SR that is associated with a predetermined TCI state.

[0153] 10, it is assumed that a beam failure (cell-based BFR) is detected in the second cell. In this case, the UE may transmit the PUCCH for SR by preferentially selecting / using the PUCCH resource for SR (here, PUCCH resource for SR #2-1) that is not related to the TCI state (here, any of TCI states #32 to #63) corresponding to the BFD-RS in which the beam failure is detected. Furthermore, the UE may control the PUCCH resource for SR to be transmitted to the TRP (here, TRP #1) of the first cell.

[0154] <Variations> Cases 4-1 to 4-3 show cases where different SR PUCCH resources are configured for each cell, but this is not limiting. For example, a maximum of X (e.g., X=2) SR PUCCH resources are configured for each cell group, but the association between the SR PUCCH resource and the TRP index may be configured separately for each cell. For example, in Figures 8 to 10, SR PUCCH resources #2-1 and #2-2 may be changed to either #1-1 or #1-2, respectively.

[0155] Alternatively, in Cases 4-1 to 4-3, the PUCCH resource for SR may be configured in cell group units (or for a cell group). Also, the association between the PUCCH resource for SR and the TRP, or the association between the PUCCH resource for SR and the TCI state / QCL may be configured commonly for a cell group (or an SpCell, a PUCCH-SCell).

[0156] <Case 4-1'> In case 4-1, the PUCCH resource for SR may be configured in cell group units (see FIG. 11).

[0157] 11 shows a case where multiple (here, two) PUCCH resources for SR #2-1 and #2-2 are configured for a cell group including a first cell and a second cell. Here, two TRPs (here, TRP #1 and TRP #2) are configured / applied / turned on in the first cell (e.g., SpCell), and one TRP (here, TRP #2) is configured / applied / turned on in the second cell (e.g., SCell).

[0158] Also, a case is shown in which PUCCH resource #2-1 for SR is not associated with a TRP, and PUCCH resource #2-2 for SR is associated with TRP#2.

[0159] The UE may be notified by the base station, via RRC / MAC CE / DCI, of information regarding the PUCCH resource for SR configured for each cell group (for example, SpCell or PUCCH-SCell). Also, the UE may be notified by the base station, via RRC / MAC CE / DCI, of information regarding the association between the PUCCH resource for SR configured for each cell group and the TRP (which may include information on the presence or absence of the association).

[0160] When a beam failure is detected in a certain cell, the PUCCH resource for SR of the cell group associated with the cell (or failed CC) in which the beam failure is detected may be selected / transmitted.

[0161] For example, in FIG. 11, assume that a beam failure (TRP-based BFR) is detected in TRP#2 of the second cell. In this case, the UE may preferentially select / use the SR PUCCH resource (SR PUCCH resource #2-1 / #2-2) associated / corresponding to the cell group including the second cell. Here, the UE selects / applies the SR PUCCH resource #2-1, which is not associated with TRP#2 in which a beam failure is detected, to transmit the SR PUCCH to TRP#1 of the first cell, but this is not limiting. The SR PUCCH resource #2-2 may also be selected / applied.

[0162] <Case 4-2'> In case 4-2, the PUCCH resource for SR may be configured in units of cell groups (see FIG. 12).

[0163] 12 illustrates a case where two TRPs (here, TRP#1 and TRP#2) are configured / applied / on in a first cell (e.g., SpCell) and no TRP (or TRP index) is configured in a second cell (e.g., SCell). In this case, multiple (here, two) PUCCH resources #2-1 and #2-2 for SR may be configured for a cell group including the first cell and the second cell.

[0164] For example, in FIG. 12, it is assumed that a beam failure (cell-based BFR) is detected in the second cell. In this case, the UE may preferentially select / use the SR PUCCH resource #2-1 related / corresponding to the second cell to transmit the SR PUCCH. Furthermore, the UE may control the SR PUCCH resource to be transmitted to the TRP (here, TRP #1) of the first cell.

[0165] This shows a case where PUCCH resource #2-1 for SR is not associated with a TRP, and PUCCH resource #2-2 for SR is associated with TRP#2.

[0166] For example, in FIG. 12, assume that a beam failure (cell-based BFR) is detected in the second cell. In this case, the UE may select / use a PUCCH resource for SR associated with / corresponding to a cell group including the second cell to transmit the PUCCH for SR. Here, the UE selects / applies a PUCCH resource for SR #2-1 that is not associated with any TRP to transmit the PUCCH for SR to TRP #1 of the first cell, but this is not limiting. The PUCCH resource for SR #2-2 may also be selected / applied.

[0167] <Case 4-3'> In case 4-3, the PUCCH resource for SR may be configured in cell group units (see FIG. 13).

[0168] A case is shown in which a plurality of (here, two) PUCCH resources for SR #2-1 and #2-2 are configured for a cell group including a first cell and a second cell.

[0169] Here, it is shown that PUCCH resource #2-1 for SR is associated with the first TCI state / QCL (here, TCI states #0 to #31), and PUCCH resource #2-2 for SR is associated with the second TCI state / QCL (here, TCI states #32 to #63).

[0170] 13, it is assumed that a beam failure (cell-based BFR) is detected in the second cell. In this case, the UE may transmit the PUCCH for SR by preferentially selecting / using the PUCCH resource for SR (here, PUCCH resource for SR #2-1) that is not related to the TCI state (here, any of TCI states #32 to #63) corresponding to the BFD-RS in which the beam failure is detected. Furthermore, the UE may control the PUCCH resource for SR to be transmitted to the TRP (here, TRP #1) of the first cell.

[0171] In a fourth aspect, after completion of the BFR procedure (BFR completion), the PUCCH resources for PUCCH / SR associated with the TRP in which beam failure is detected and the PUCCH resources for PUCCH / SR associated with the TRP in which beam failure is not detected may be updated based on q_new corresponding to the new candidate beam.

[0172] (UE capability information) In the above first to fourth aspects, the following UE capabilities may be configured. Note that the following UE capabilities may be interpreted as parameters (e.g., higher layer parameters) configured in the UE from the network (e.g., base station).

[0173] UE capability information regarding whether or not to support BFR per TRP (e.g., TRP specific BFR) may be defined.

[0174] UE capability information regarding the number of BFD-RSs / BFD-RS sets that a UE can support per BWP / per cell / per band / per UE / per cell group may be defined.

[0175] UE capability information regarding the number of PUCCH resources for SR that the UE can support may be defined for each BWP / cell / band / UE / cell group.

[0176] UE capability information may be defined regarding whether the UE supports the association of PUCCH resources for SR with TRP indices, the association of PUCCH resources for SR with TCI states, or the association of PUCCH resources for SR with BFD-RS / BFD-RS sets.

[0177] UE capability information regarding whether the UE supports setting different associations for each cell between the PUCCH resource for SR and the TRP index may be defined.

[0178] UE capability information may be defined regarding whether each cell supports different BFR configurations (e.g., cell #1: BFR per TRP, cell #2: BFR per cell).

[0179] In this case, UE capability information regarding whether or not a different number of BFD-RS sets is supported for each cell (e.g., cell #1: two BFD-RS sets, cell #2: one BFD-RS set) may be defined. Also, UE capability information regarding whether or not a different number of PUCCH resources for SR is supported for each cell (e.g., cell #1: two PUCCH resources for SR, cell #2: one PUCCH resource for SR) may be defined.

[0180] UE capability information may be defined regarding whether or not to support updating PUCCH / PUCCH resources for SR related to TRPs where beam failure is detected / TRPs where beam failure is not detected based on q_new after BFR completion.

[0181] The first to fourth aspects may be applied to a UE that supports / reports at least one of the above-mentioned UE capabilities, or may be applied to a UE configured by a network.

[0182] (wireless communication system) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0183] 14 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0184] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0185] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0186] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0187] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0188] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0189] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be a frequency band higher than FR2.

[0190] Furthermore, the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

[0191] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0192] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0193] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0194] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0195] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0196] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0197] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0198] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0199] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0200] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0201] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0202] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0203] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0204] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0205] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted as DL-RS.

[0206] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as reference signals.

[0207] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0208] (base station) 15 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0209] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0210] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0211] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0212] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0213] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0214] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0215] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0216] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0217] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0218] The transceiver 120 (transmission processor 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0219] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0220] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna .

[0221] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0222] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0223] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0224] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0225] The transceiver 120 may transmit information regarding the configuration of beam failure detection for each transmission / reception point (TRP) and information regarding the configuration of uplink control channel resources corresponding to the scheduling request.

[0226] When a terminal detects a beam failure in a first TRP, the control unit 110 may control the reception of a scheduling request transmitted from the terminal using either an uplink control channel resource corresponding to the first TRP or an uplink control channel resource corresponding to a second TRP different from the first TRP.

[0227] (user terminal) 16 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0228] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0229] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0230] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.

[0231] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured from a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0232] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0233] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0234] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0235] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0236] The transceiver 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0237] The transceiver 220 (transmission processor 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0238] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0239] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0240] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0241] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0242] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0243] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0244] The transceiver 220 may receive information regarding the configuration of beam failure detection for each transmission / reception point (TRP) and information regarding the configuration of uplink control channel resources corresponding to the scheduling request.

[0245] The transceiver 220 may receive information relating to the association between the TRP index and the index of the uplink control channel resource corresponding to the scheduling request. The transceiver 220 may receive information relating to the association between the TRP index and the index of the configuration information of the scheduling request. The transceiver 220 may receive information relating to the association between the TRP index and the index of the spatial relationship of the uplink control channel resource corresponding to the scheduling request.

[0246] When a beam failure is detected in a first TRP, the control unit 210 may control the transmission of a scheduling request using either an uplink control channel resource corresponding to the first TRP or an uplink control channel resource corresponding to a second TRP different from the first TRP.

[0247] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0248] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As mentioned above, the implementation method of each is not particularly limited.

[0249] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 17 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0250] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0251] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0252] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0253] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0254] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0255] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0256] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0257] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0258] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0259] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0260] Furthermore, the base station 10 and the user terminal 20 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), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0261] (Variation) Note that terms explained in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0262] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0263] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0264] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0265] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0266] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0267] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0268] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0269] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0270] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0271] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0272] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0273] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0274] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0275] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0276] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0277] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0278] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0279] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0280] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0281] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0282] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0283] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0284] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0285] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0286] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0287] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, such as an RRC connection setup message or an RRC connection reconfiguration message. The MAC signaling may be transmitted using a media access control (MAC) control element (CE), for example.

[0288] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0289] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0290] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0291] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0292] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0293] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "Reference Signal (RS) port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "transmitting and receiving point," etc. may be used interchangeably.

[0294] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0295] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0296] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0297] A mobile station may also be referred to as a 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 suitable terminology.

[0298] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, or the mobile object itself. The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do 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.

[0299] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0300] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0301] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0302] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the specific order presented.

[0303] Each aspect / embodiment described in the present disclosure may be related to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use 802.20, Ultra-Wide Band (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on and extend these systems. Furthermore, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0304] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0305] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0306] The term "determining," as used in this disclosure, may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0307] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0308] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0309] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0310] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0311] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0312] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0313] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0314] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0315] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A transmitter that transmits capability information regarding the number of physical uplink control channel (PUCCH) resources for scheduling requests (SRs) that can be supported in a cell group; A terminal having a control unit that controls the transmission of an SR using a PUCCH resource associated with a first transmission / reception point (TRP) when a beam failure is detected in the first TRP of a first transmission / reception point (TRP) and a second TRP.

2. transmitting capability information regarding the number of Physical Uplink Control Channel (PUCCH) resources for Scheduling Requests (SRs) that can be supported in a cell group; A wireless communication method for a terminal, comprising: a step of controlling the transmission of an SR using a PUCCH resource associated with a first transmission / reception point (TRP) when a beam failure is detected in the first TRP of a first TRP and a second TRP.

3. A receiver for receiving capability information regarding a number of Physical Uplink Control Channel (PUCCH) resources for Scheduling Requests (SRs) that can be supported in a cell group; A base station having a control unit that controls reception of an SR transmitted using a PUCCH resource associated with a first transmission / reception point (TRP) when a beam failure is detected in the first TRP of a first transmission / reception point (TRP) and a second TRP.

4. A system including a terminal and a base station, The terminal a transmitter for transmitting capability information regarding a number of physical uplink control channel (PUCCH) resources for scheduling requests (SRs) that can be supported in a cell group; A control unit that controls the transmission of an SR using a PUCCH resource associated with a first transmission / reception point (TRP) when a beam failure is detected in the first TRP of a first transmission / reception point (TRP) and a second TRP; The base station The system includes a receiver for receiving the capability information.

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