Terminal, wireless communication method and base station

Abstract

A terminal involved in one embodiment of the present disclosure includes: a transmitting unit that transmits a random access preamble in a certain cell when a beam failure is detected; and a control unit that monitors a downlink control channel in a certain control resource set using the quasi-co-location parameters of the antenna port that are the same as the quasi-co-location parameters of the antenna port associated with the index of the reference signal corresponding to the transmission of the random access preamble, after a certain period from the last code element received in the initial downlink control channel of the downlink control information format having a cyclic redundancy check (CRC) scrambled by a cell-radio network temporary identifier (Cell Radio Network Temporary Identifier (C-RNTI)) or a modulation coding scheme (Modulation Coding Scheme (MCS))-C-RNTI is detected in the search space set provided by the recovery search space identifier (Identifier (ID)). The quasi-co-location parameters of the antenna port are the same as the quasi-co-location parameters of the antenna port associated with the index of the reference signal corresponding to the transmission of the random access preamble. According to one embodiment of the present disclosure, the beam can be appropriately updated in association with the BFR.

Description

Technical Field

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

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) is standardized for the purpose of further increasing the capacity and sophistication of LTE (Release (Rel.) 8, 9 of the Third Generation Partnership Project (3GPP)).

[0003] Successor systems of LTE (also known as, for example, 5th generation mobile communication system (5G), 5G+(plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

[0006] 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

[0007] Problems to be solved by the invention

[0008] In NR, a process is being studied in which a user terminal (user terminal, User Equipment (UE)) detects a beam failure (Beam Failure: BF) and implements a process for switching to another beam (also referred to as a Beam Failure Recovery (BFR) process, BFR, etc.).

[0009] However, in the current Rel.16NR specification, appropriate beam updates are not necessarily performed for the uplink control channel (Physical Uplink Control Channel (PUCCH)) and downlink control channel (Physical Downlink Control Channel (PDCCH)) after BFR. If appropriate beam updates are not performed, there is a concern that throughput will be reduced or communication quality will deteriorate.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately update a beam in association with BFR.

[0011] Means for solving problems

[0012] A terminal involved in one embodiment of the present invention comprises: a transmitting unit, which transmits a random access preamble code in a certain cell when a beam failure is detected; and a control unit, which monitors the downlink control channel in a certain control resource set using the quasi-co-location parameters of the antenna port that are the same as the quasi-co-location parameters of the antenna port associated with the index of the reference signal corresponding to the transmission of the random access preamble code, after a certain period from the last code element received in the initial downlink control channel having a downlink control information format having a cyclic redundancy check (CRC) encrypted by a cell-radio network temporary identifier (Cell Radio Network Temporary Identifier (C-RNTI)) or a modulation coding scheme (Modulation Coding Scheme (MCS))-C-RNTI is detected in the search space set provided by the recovery search space identifier (Identifier (ID)).

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, it is possible to appropriately update the beam in association with the BFR. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a diagram showing an example of the beam recovery process in Rel.15NR.

[0016] Figure 2 This is a diagram showing an example of updating of the spatial relationship for PUCCH after CFRABFR in the first embodiment.

[0017] Figure 3 This is a diagram showing an example of updating of QCL assumption for PDCCH after CFRABFR in the second embodiment.

[0018] Figure 4 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0019] Figure 5 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0020] Figure 6 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0021] Figure 7 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION

[0022] (Beam Failure Recovery)

[0023] In NR, research is being conducted on using beamforming for communication. For example, UE and base station (e.g., gNodeB (gNB)) may use beams used for signal transmission (also called transmit beams, Tx beams, etc.) and beams used for signal reception (also called receive beams, Rx beams, etc.).

[0024] When beamforming is used, it is susceptible to interference caused by obstacles, so it is assumed that the quality of the radio link will deteriorate. Due to the deterioration of the radio link quality, there is a concern that radio link failures (RLF) will occur frequently. If RLF occurs, the cell needs to be reconnected, so frequent occurrence of RLF will lead to degradation of system throughput.

[0025] In NR, in order to suppress the occurrence of RLF, a process of switching to other beams (also called beam recovery (BR), beam failure recovery (BFR), L1 / L2 (Layer 1 / Layer 2) beam recovery, etc.) is being studied when the quality of a specific beam deteriorates. In addition, the BFR procedure can also be referred to as BFR.

[0026] In addition, beam failure (Beam Failure: BF) in the present disclosure may also be referred to as link failure (link failure) or radio link failure (RLF).

[0027] Figure 1 This is a diagram showing an example of the beam recovery process in Rel.15NR. The number of beams is an example and is not limited to this. Figure 1 In the initial state (step S101), the UE implements measurement based on the reference signal (RS) resources transmitted using two beams.

[0028] The RS may be at least one of a synchronization signal block (SSB) and a channel state measurement RS (CSI-RS). In addition, SSB may be referred to as a SS / PBCH (Physical Broadcast Channel) block or the like.

[0029] RS may also 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 formed by extending or changing them. The RS measured in step S101 may also be referred to as an RS for beam failure detection (Beam Failure Detection RS: BFD-RS), etc.

[0030] In step S102, the UE cannot detect the BFD-RS (or the reception quality of the RS deteriorates) because the radio waves from the base station are blocked. Such blocking may occur due to, for example, obstacles, fading, interference, etc. between the UE and the base station.

[0031] When certain conditions are met, the UE detects a beam failure. For example, when the block error rate (BLER) is less than a threshold for all configured BFD-RS (BFD-RS resource settings), the UE can also detect the occurrence of a beam failure. If a beam failure is detected, the lower layer (physical (PHY) layer) of the UE can also notify (indicate) the higher layer (MAC layer) of the beam failure instance.

[0032] In addition, the criterion (standard) for judgment is not limited to BLER, but may also be the reference signal received power in the physical layer (Layer 1 Reference Signal Received Power (Layer 1 Reference Signal Received Power: L1-RSRP)). In addition, beam failure detection may be implemented based on a downlink control channel (Physical Downlink Control Channel (PDCCH)) instead of RS measurement or on the basis of RS measurement. BFD-RS may also be expected to be quasi-co-located (Quasi-Co-Location: QCL) with the DMRS of the PDCCH monitored by the UE.

[0033] Here, QCL is an indicator indicating the statistical properties of a channel. For example, when a certain signal / channel is in a QCL relationship with other signals / channels, it can also mean that it can be assumed that at least one of Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx Filter / Parameter, spatial Tx (transmission) Filter / Parameter)) is the same among these different multiple signals / channels (at least one of them is QCL).

[0034] In addition, the spatial reception parameter may also correspond to a reception beam of the UE (eg, a reception analog beam), and the beam may also be determined based on the spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may also be replaced by spatial QCL (sQCL).

[0035] Information related to BFD-RS (e.g., RS index, resource, number, number of ports, precoding, etc.), information related to beam failure detection (BFD) (e.g., the above-mentioned threshold), etc. can also be set (notified) to the UE using high-layer signaling, etc. The information related to BFD-RS can also be referred to as information related to BFR resources, etc.

[0036] In the present disclosure, the high-layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0037] MAC signaling may use, for example, MAC Control Element (CE), MAC Protocol Data Unit (PDU), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information: RMSI), Other System Information (OSI), etc.

[0038] The MAC layer of the UE may also start a specific timer (also referred to as a beam failure detection timer) when receiving a beam failure instance notification from the PHY layer of the UE. The MAC layer of the UE may also trigger BFR (e.g., start any of the random access procedures described later) after receiving a certain number of beam failure instance notifications (e.g., beamFailureInstanceMaxCount set by RRC) or more before the timer expires.

[0039] In the absence of notification from the UE (for example, the time without notification exceeds a specific time) or when a specific signal (beam recovery request in step S104) is received from the UE, the base station can also determine that the UE has detected a beam failure.

[0040] In step S103, the UE starts searching for a new candidate beam (new candidate beam) for communication in order to recover the beam. The UE can also select a new candidate beam corresponding to a specific RS by measuring the RS. The RS measured in step S103 may also be referred to as RS for new candidate beam identification (New Candidate Beam Identification RS: NCBI-RS), CBI-RS, candidate beam RS (Candidate Beam RS (CB-RS)), etc. NCBI-RS may be the same as or different from BFD-RS. In addition, the new candidate beam may also be referred to as a new candidate beam, a candidate beam or a new beam.

[0041] The UE may also determine the beam corresponding to the RS that meets specific conditions as a new candidate beam. For example, the UE may also determine a new candidate beam based on the RS in the set NCBI-RS whose L1-RSRP exceeds the threshold. In addition, the criterion (standard) for judgment is not limited to L1-RSRP. It may also be determined using at least one of L1-RSRP, L1-RSRQ, and L1-SINR (signal-to-noise interference power ratio). The L1-RSRP associated with SSB may also be referred to as SS-RSRP. The L1-RSRP associated with CSI-RS may also be referred to as CSI-RSRP. Similarly, the L1-RSRQ associated with SSB may also be referred to as SS-RSRQ. The L1-RSRQ associated with CSI-RS may also be referred to as CSI-RSRQ. In addition, similarly, the L1-SINR associated with SSB may also be referred to as SS-SINR. The L1-SINR associated with CSI-RS may also be referred to as CSI-SINR.

[0042] Information related to NCBI-RS (e.g., RS resources, quantity, number of ports, precoding, etc.), information related to new candidate beam identifier (NCBI) (e.g., the above-mentioned threshold), etc. can also be set (notified) to the UE using high-layer signaling, etc. Information related to NCBI-RS can also be obtained based on information related to BFD-RS. Information related to NCBI-RS can also be referred to as information related to NCBI resources, etc.

[0043] In addition, BFD-RS, NCBI-RS, etc. may be replaced by a radio link monitoring reference signal (RLM-RS: Radio Link Monitoring RS).

[0044] In step S104, the UE that has determined the new candidate beam sends a beam recovery request (Beam Failure Recovery request: BFRQ). The beam recovery request may also be called a beam recovery request signal, a beam failure recovery request signal, etc.

[0045] BFRQ can also be sent using a random access channel (Physical Random Access Channel (PRACH)), for example. BFRQ can also include information about the new candidate beam determined in step S103. Resources used for BFRQ can also be associated with the new candidate beam. The beam information can also be notified using a beam index (Beam Index: BI), a port index of a specific reference signal, a resource index (for example, a CSI-RS resource indicator (CSI-RS Resource Indicator: CRI), an SSB resource indicator (SSBRI)), etc.

[0046] In Rel.15NR, BFR based on contention-based (or contention-based) random access (contention-based Random Access (CBRA)) process, namely CB-BFR (contention-based BFR (Contention-Based BFR)) and BFR based on non-contention-based (or non-contention-based) random access (non-contention-Free Random Access (CFRA)) process, namely CF-BFR (non-contention-Free BFR (Contention-Free BFR)) are supported. In CB-BFR and CF-BFR, UE can also use PRACH resources to send preambles (also called RA preambles, random access channels (physical random access channels (Physical Random Access Channel: PRACH)), RACH preambles, etc.) as BFRQ.

[0047] In addition, CF-BFR may also be referred to as CFRABFR. CB-BFR may also be referred to as CBRA BFR. CFRA process and CFRA may also be used interchangeably. CBRA process and CBRA may also be used interchangeably.

[0048] In step S105, the base station that detects the BFRQ sends a response signal (also referred to as a BFR response, a gNB response, etc.) to the BFRQ from the UE. The response signal may also include reconstruction information for one or more beams (e.g., composition information of DL-RS resources).

[0049] The response signal may also be sent, for example, in the UE common search space of the PDCCH. The response signal may also be notified using a PDCCH (DCI) having a cyclic redundancy check (CRC) scrambled by an identifier of the UE (e.g., a Cell-Radio RNTI Network Temporary Identifier (C-RNTI)). The UE may also determine at least one of the transmit beam and receive beam used based on the beam reconstruction information.

[0050] 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. For example, the UE may detect DCI having a CRC scrambled by C-RNTI in a BFR search space in a CORESET configured separately.

[0051] Regarding CB-BFR, when the UE receives the PDCCH corresponding to the C-RNTI related to itself, it can also be determined that the contention resolution has succeeded.

[0052] Regarding the processing of step S105, a period for the UE to monitor the response from the base station (e.g., gNB) to the BFRQ may also be set. This period may also be called, for example, a gNB response window, a gNB window, a beam recovery request response window, a BFRQ response window, etc. If no gNB response is detected during this window, the UE may retransmit the BFRQ.

[0053] In step S106, the UE may send a message to the base station indicating that the beam reconfiguration is completed. This message may be sent, for example, via the PUCCH or the PUSCH.

[0054] In step S106, the UE may receive RRC signaling indicating the configuration of the transmission configuration indication state (TCI state) used for the PDCCH, or may receive a MAC CE indicating activation of the configuration.

[0055] Beam recovery success (BR success) may also indicate, for example, reaching step S106. On the other hand, beam recovery failure (BR failure) may also correspond to, for example, BFRQ transmission reaching a specific number of times or the beam failure recovery timer (Beam-failure-recovery-Timer) expiring.

[0056] In addition, the numbers of these steps are only for explanation, and multiple steps may be combined or their order may be changed. In addition, whether to implement BFR may be set to the UE using higher layer signaling.

[0057] (QCL concept of PDCCH after BFR, PUCCH spatial relationship)

[0058] In the Rel.16NR specification (TS 38.213 V16.0.0 §6 Link recovery procedures) studied so far, the following is stated about the update of the QCL (beam) for PDCCH after BFR:

[0059] · For PDCCH monitoring and corresponding PDSCH reception in the search space provided by the recovery search space ID (recoverySearchSpaceId), the UE may also assume that the search space ID with index q new The quasi-colocation parameters of the associated antenna port are the same as the quasi-colocation parameters of the antenna port until the UE receives the activation of the TCI state or the parameters of the TCI state list for PDCCH (tci-StatesPDCCH-ToAddList, tci-StatesPDCCH-ToReleaseList, etc.) through the higher layer (For PDCCH monitoring in a search space set provided by recoverySearchSpaceId and for corresponding PDSCH reception, the UE assumes the same antenna port quasi-collocation parameters as the ones associatedwith index q newuntil the UE receives by higher layers an activation for a TCIstate or any of the parameters tci-StatesPDCCH-ToAddList and / or tci-StatesPDCCH-ToReleaseList),

[0060] · For the primary cell (PCell) or primary secondary cell (PSCell), the UE detects the CRC in the search space set provided by the recovery search space ID (recoverySearchSpaceId) by the C-RNTI or modulation coding scheme (Modulation Coding Scheme) C-RNTI (MCS-C-RNTI) The last codeword of the first PDCCH received is 28 codewords later. For PDCCH monitoring in the CORESET of index 0, the UE can also assume that the same index q new Quasi-colocation parameters of the associated antenna port The quasi-colocation parameters of the same antenna port (For the PCell or the PSCell, after 28 symbols from a last symbol of a first PDCCH reception in asearch space set provided by recoverySearchSpaceId where a UE detects a DCI format with CRC scrambled by C-RNTI or MCS-C-RNTI, the UE assumes same antennaport quasi-collocation parameters as the ones associated with index q new forPDCCH monitoring in a CORESET with index 0.).

[0061] In addition, in the above-mentioned Rel.16NR specification, the following is stated for the update of the spatial relationship (beam) for PUCCH after BFR:

[0062] For the PCell or the PSCell, after 28 symbols from a last symbol of a first PDCCH reception in a search space set provided by recoverySearchSpaceId for which the UE detects a DCI format with CRC scrambled by C-RNTI or MCS-C-RNTI and until the UE receives an activation command for PUCCH spatial relationship information (PUCCH-SpatialRelationInfo) or PUCCH spatial relationship information (PUCCH-SpatialRelationInfo) provided for PUCCH resources, the UE may also use the following transmission conditions when transmitting PUCCH in the same cell as the cell in which the PRACH was transmitted (For the PCell or the PSCell, after 28 symbols from a last symbol of a first PDCCH reception in a search space set provided by recoverySearchSpaceId for which the UE detects a DCI format with CRC scrambled by C-RNTI or MCS-C-RNTI and until the UE receives an activation command for PUCCH spatial relationship information (PUCCH-SpatialRelationInfo) or PUCCH spatial relationship information (PUCCH-SpatialRelationInfo) provided for PUCCH resources PUCCH-SpatialRelationInfo or is provided PUCCH-SpatialRelationInfo for PUCCH resource(s), the UE transmits a PUCCH on a samecell as the PRACH transmission using):

[0063] Using a same spatial filter as for the last PRACH transmission,

[0064] In the formula used to determine the transmission power of the PUCCH (Subclause 7.2.1 of TS 38.213), the transmission power is calculated using q u =0,q d =q new , l = 0 (determined as described in subclause 7.2.1, where q u =0,qd =q new , l=0(a power determined as described in Clause 7.2.1withq u =0,q d =q new , l=0)).

[0065] In addition, q new It can also be the index of a new candidate beam (e.g., SSB / CSI-RS) selected by the UE during the BFR process and reported to the network through the corresponding PRACH (or the index of a new beam discovered during the BFR process).

[0066] In normal circumstances, q u It may also be a PUCCH P0 ID (p0-PUCCH-Id) indicating PUCCH P0 (P0-PUCCH) in a PUCCH P0 set (p0-Set). l It may also be called an index of a power control adjustment state, an index of a PUCCH power control adjustment state, a closed-loop index, etc. q d It may also be an index of a path loss reference RS (for example, set by PUCCH-PathlossReferenceRS).

[0067] Due to the above-mentioned regulations, for PDCCH / PUCCH, during the period from when the RA process for BFR is completed until the explicit beam is set / activated, transmission and reception processing based on an unclear beam can be avoided, thereby suppressing degradation of communication quality.

[0068] However, the above regulations do not take into account the PUCCH using the default spatial relationship (PUCCH (PUCCH resource) for which PUCCH-SpatialRelationInfo is not set when enableDefaultBeamPlForPUCCH is set to the UE). If the existing specifications are used directly, the beam of the PUCCH using the default spatial relationship will be fixed to q new (In other words, the default spatial relationship is cancelled.) In this case, there is a possibility that an appropriate beam cannot be used, and there is a possibility that throughput is reduced or communication quality is degraded.

[0069] Therefore, the inventors of the present invention have conceived a method for appropriately updating the beam in association with the BFR.

[0070] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0071] In the present disclosure, "A / B" and "at least one of A and B" may be used interchangeably.

[0072] In the present disclosure, panel, beam, panel group, beam group, uplink (UL) transmitting entity, TRP, spatial relationship information (SRI), spatial relationship, control resource set (CORESET), physical downlink shared channel (PDSCH), codeword, base station, specific antenna port (for example, demodulation reference signal (DMRS)) port), specific antenna port group (for example, DMRS port group), specific group (for example, code division multiplexing (CDM)) group, specific reference signal group, CORESET group), specific resource (for example, specific reference signal resource), specific resource set (for example, specific reference signal resource set), CORESET pool, PUCCH group (PUCCH resource group), spatial relationship group, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state (unifiedTCI state), QCL, etc. can also be replaced with each other.

[0073] In the present disclosure, index, ID, indicator, resource ID, etc. may also be interchangeable.

[0074] (Wireless Communication Method)

[0075] <First embodiment>

[0076] In the first embodiment, it is assumed that the UE updates the spatial relationship of the PUCCH after the completion of the CFRA BFR.

[0077] In the first embodiment, the updating of the spatial relationship for PUCCH after CFRA BFR may also be performed as follows:

[0078] For the PCell or the PSCell, if the UE is provided PUCCH-SpatialRelationInfo, after X symbols from a last symbol of afirst PDCCH reception in a search space set provided by recoverySearchSpaceIdfor which the UE detects a DCI format with CRC scrambled by C-RNTI or MCS-C-RNTI, until the UE receives an activation command for PUCCH spatial relationship information (PUCCH-SpatialRelationInfo) or is provided PUCCH spatial relationship information (PUCCH-SpatialRelationInfo) for PUCCH resources, the UE may also use the following transmission conditions when transmitting PUCCH in the same cell as the cell in which PRACH is transmitted (For the PCell or the PSCell, if the UE is provided PUCCH-SpatialRelationInfo, after X symbols from a last symbol of afirst PDCCH reception in a search space set provided by recoverySearchSpaceIdfor which the UE detects a DCI format with CRC scrambled by C-RNTI or MCS-C-RNTI, until the UE receives an activation command for PUCCH spatial relationship information (PUCCH-SpatialRelationInfo) or is provided PUCCH spatial relationship information (PUCCH-SpatialRelationInfo) for PUCCH resources CRC scrambled by C-RNTI or MCS-C-RNTI and until the UE receives an activation command for PUCCH-SpatialRelationInfo or is provided PUCCH-SpatialRelationInfo for PUCCHresource(s), the UE transmits a PUCCH on a same cell as the PRACHusing transmission):

[0079] Using a same spatial filter as for the last PRACH transmission,

[0080] In the formula used to determine the transmission power of the PUCCH (Subclause 7.2.1 of TS 38.213), the transmission power is calculated using q u =0,q d =q new , l = 0 (determined as described in subclause 7.2.1, where q u =0,q d =q new , l=0(a power determined as described in Clause 7.2.1withq u =0,q d =q new , l=0)).

[0081] In addition, q new It can also be the index of a new candidate beam (e.g., SSB / CSI-RS) selected by the UE in the CFRABFR process and reported to the network via the corresponding PRACH (or the index of a new beam discovered in the BFR process). new It can be equivalent to the index of the SS / PBCH block selected for the last PRACH transmission (the SS / PBCH blockindex selected for the last PRACH transmission), the index of the SS / PBCH block provided by the BFR MAC CE, or the index of the SS / PBCH block provided by a higher layer (for example, the MAC layer).

[0082] In addition, if the UE is provided PUCCH-SpatialRelationInfo, q newCBRA (or q new ) can be equivalent to the index of the SS / PBCH block selected for the latest PRACH transmission, the index of the SS / PBCH block provided through the BFR MAC CE, or the index of the SS / PBCH block provided through a higher layer (for example, the MAC layer).

[0083] In addition, the above-mentioned X may be determined in advance through specifications (for example, X=28), may be set through higher-layer signaling, etc., or may be determined based on UE capabilities (for example, UE capabilities related to BFR).

[0084] In addition, the phrase "until the UE receives an activation command for PUCCH-SpatialRelationInfo or is provided PUCCH-SpatialRelationInfo for PUCCH resource(s)" in the present disclosure may also be replaced with "until the UE receives an activation command for PUCCH-SpatialRelationInfo and if PUCCH-SpatialRelationInfo is provided for PUCCH resource(s)".

[0085] The "if the UE is provided PUCCH-SpatialRelationInfo" in the present disclosure may also be replaced with "if the UE is provided with information related to the default spatial relationship for PUCCH and the activation of the default PL-RS (if UE is provided enableDefaultBeamPlForPUCCH)". Here, enableDefaultBeamPlForPUCCH may also be equivalent to a higher-layer (RRC) parameter related to the activation of the default beam path loss for PUCCH.

[0086] In addition, the "if the UE is provided PUCCH-SpatialRelationInfo" in the present disclosure can also be replaced by "if the UE is provided PUCCH-SpatialRelationInfo or the UE is provided with information related to the default spatial relationship for PUCCH and the activation of the default PL-RS (if the UE is provided PUCCH-SpatialRelationInfo or UE is providedenableDefaultBeamPlForPUCCH)" and "if the UE is provided PUCCH spatial relationship information and the UE is provided with information related to the default spatial relationship for PUCCH and the activation of the default PL-RS (if the UE isprovided PUCCH-SpatialRelationInfo and UE is providedenableDefaultBeamPlForPUCCH)".

[0087] The "PUCCH spatial relationship information (PUCCH-SpatialRelationInfo)" of the present disclosure may also be replaced with "PUCCH spatial relationship information (PUCCH-SpatialRelationInfo for (the) PUCCHresource(s))". For example, the "if the UE is provided PUCCH-SpatialRelationInfo)" of the present disclosure may also be replaced with "if the UE is provided PUCCH-SpatialRelationInfo for PUCCH resource(s)". In this case, the above-mentioned "until the UE receives an activation command for PUCCH-SpatialRelationInfo or is provided PUCCH-SpatialRelationInfo for PUCCH resource(s)" can also be replaced by "until the UE receives an activation command for PUCCH-SpatialRelationInfo or is provided PUCCH-SpatialRelationInfo for the PUCCH resource(s)"

[0088] In addition, the terms "until the UE receives an activation command for PUCCH-SpatialRelationInfo or is provided PUCCH-SpatialRelationInfo for PUCCH resource(s)", "until the UE receives an activation command for PUCCH-SpatialRelationInfo or is provided PUCCH-SpatialRelationInfo for PUCCH resource(s)", "until the UE receives an activation command or configuration toupdate spatial domain filter for PUCCH resource(s)", "until the UE receives an activation command or configuration toupdate corresponding TCIstate for default spatial relation for PUCCH resource(s)" and the like in the present disclosure may also be replaced with each other. In the case of this replacement, the above-mentioned condition "if the UE isprovided PUCCH-SpatialRelationInfo" may also be deleted.

[0089] In addition, the "activation command for updating the spatial domain filter for PUCCH resources" may also be an activation (activation command, activation MAC CE) of the TCI state for the CORESET referenced by the PUCCH using the default spatial relationship. The "settings for updating the spatial domain filter for PUCCH resources" may also be a parameter of a list of TCI states for PDCCH for the CORESET referenced by the PUCCH using the default spatial relationship (tci-StatesPDCCH-ToAddList, tci-StatesPDCCH-ToReleaseList, etc.).

[0090] In addition, the above-mentioned "until the UE receives an activation command or configuration toupdate spatial domain filter for PUCCH resource(s)" can also be replaced with "if the UE is provided PUCCH-SpatialRelationInfo,until the UE receives an activation command for PUCCH-SpatialRelationInfo or is provided PUCCH-SpatialRelationInfo for PUCCHresource(s)", otherwise, until the UE receives an activation command or configuration to update corresponding TCI state fordefault spatial relation for PUCCH resource(s)".

[0091] Figure 2 This is a diagram showing an example of updating the spatial relationship for PUCCH after CFRA BFR in the first embodiment. In this example, the UE assumes that the new beam of PUCCH is the same as (new beam of) PRACH during the period from the first timing to the second timing after the completion of CFRA BFR (the above-mentioned transmission conditions are used in the transmission of PUCCH).

[0092] Figure 2 The first timing may also be X symbols after the last symbol received in the initial PDCCH of the DCI format in which the UE detects CRC encrypted by C-RNTI or MCS-C-RNTI in the search space set (also referred to as the BFR search space set) provided by the recovery search space ID (recoverySearchSpaceId).

[0093] Figure 2 The second timing may also be the timing at which an activation command for PUCCH spatial relationship information is received for the cell that has performed CFRA BFR.

[0094] In addition, the updating of the spatial relationship for PUCCH after CFRA BFR in the first embodiment may be performed after the QCL assumption for PDCCH after CFRA BFR in the second embodiment described later is updated (the QCL assumption of CORESET (for example, all CORESETs, CORESET#0) is updated to QCL). new is applied in the case of updates).

[0095] According to the first embodiment described above, the UE can appropriately use the beam restored by the CFRA BFR for subsequent PUCCH transmission.

[0096] In addition, according to the first embodiment, for a PUCCH using a default spatial relationship (PUCCH (PUCCH resource) for which PUCCH-SpatialRelationInfo is not set when enableDefaultBeamPlForPUCCH is set to the UE), it is possible to appropriately exclude it from the application objects of the update of the spatial relationship after CFRA BFR. new ), the PUCCH using the default spatial relationship has its spatial relationship updated without updating the spatial relationship described in the first embodiment. In addition, according to this structure, it is possible to suppress the beam of the PUCCH using the default spatial relationship from being fixed to q new Consider the case where the PUCCH overwritten by the default spatial relationship cannot be released. new to reapply the default spatial relationship.

[0097] <Second embodiment>

[0098] In the second embodiment, the UE updates the QCL assumption of the PDCCH after the completion of the CFRA BFR.

[0099] In the second embodiment, the update of the QCL assumption for the PDCCH after the CFRA BFR may also be performed based on at least one of the following:

[0100] For PCell or PSCell, for PDCCH monitoring and corresponding PDSCH reception in the search space provided by the recovery search space ID (recoverySearchSpaceId), the UE may also assume that the search space ID with index q new The quasi-colocation parameters of the associated antenna port are the same as the quasi-colocation parameters of the antenna port until the UE receives the activation of the TCI state or the parameters of the TCI state list for PDCCH (tci-StatesPDCCH-ToAddList, tci-StatesPDCCH-ToReleaseList, etc.) through the higher layer (For the PCell or the PSCell,for PDCCH monitoring in asearch space set provided by recoverySearchSpaceId and for correspondingPDSCH reception,the UE assumes the same antenna port quasi-collocation parameters as the ones associated with index q new until the UE receives byhigher layers an activation for a TCI state or any of the parameters tci-StatesPDCCH-ToAddList and / or tci-StatesPDCCH-ToReleaseList),

[0101] For PCell or PSCell, after the last symbol of the first PDCCH received by the UE in the DCI format in which the CRC is scrambled by C-RNTI or MCS-C-RNTI in the search space set provided by the recovery search space ID, the UE uses the search space with index q in the same cell as the PRACH transmission. newFor the PCell or the PSCell,after X symbols from a last symbol of a first PDCCH reception in asearch space set provided by recoverySearchSpaceId where a UE detects a DCIformat with CRC scrambled by C-RNTI or MCS-C-RNTI,the UE monitors PDCCH in aCORESET on the same cell as the PRACH transmission using the same antennaport quasi-collocation parameters as the ones associate with index q new ).

[0102] Here, the above-mentioned "certain CORESET" can also be replaced by any CORESET, all CORESETs, all CORESETs (all CORESETs, except CORESET associated with recoverySearchSpaceId or ra-SearchSpace) except the CORESET associated with the recovery search space ID (recoverySearchSpaceId) or the search space for the random access process (the search space ID is set by the high-level parameter "ra-SearchSpace"), a specific CORESET, a CORESET other than CORESET#0, and at least one of CORESET#0. The "any CORESET" and "all CORESETs" here can also include CORESET#0, or can be a CORESET excluding CORESET#0. In addition, CORESET#0 can also be a CORESET set by the high-level parameter controlResourceSetZero, or can mean a CORESET with an index of 0, or can be replaced by a CORESET with the smallest index.

[0103] UE performs the above-mentioned "using and index q newThe quasi-co-location parameters of the associated antenna ports are the same as the quasi-co-location parameters of the antenna ports, and PDCCH monitoring is performed in a certain CORESET. It can also be under the condition of "until the UE receives by higher layers an activation for a TCI state or any of the parameters tci-StatesPDCCH-ToAddList and / or tci-StatesPDCCH-ToReleaseList"

[0104] For example, if the above-mentioned "certain CORESET" does not include CORESET#0 (or is not CORESET#0), the above-mentioned operation can also be performed under the condition of "until the UE receives by higher layers an activation for a TCI state or any of the parameters tci-StatesPDCCH-ToAddList and / or tci-StatesPDCCH-ToReleaseList" .

[0105] If the above-mentioned "certain CORESET" includes CORESET#0 (or CORESET#0), the above-mentioned operation can be performed without the condition of "until the UE receives by higher layers an activation for a TCI state or any of the parameters tci-StatesPDCCH-ToAddList and / or tci-StatesPDCCH-ToReleaseList".

[0106] On the other hand, regardless of whether the above-mentioned "certain CORESET" includes CORESET#0, the above-mentioned operation may be performed under this condition or may be performed without this condition.

[0107] In addition, the above X may be determined in advance by the specification (for example, X=28), may be set by high-layer signaling, etc., or may be determined based on UE capabilities (for example, UE capabilities related to BFR). X in the first embodiment and X in the second embodiment may be different values ​​or the same value. In addition, the above q new It can also be combined with q of the first embodiment new same.

[0108] Figure 3 1 is a diagram showing an example of an update of the QCL assumption for PDCCH after CFRA BFR in the second embodiment. In this example, the UE assumes that, during the period from the first timing after the completion of CFRA BFR to the second timing, the new beam for PDCCH of CORESETs other than CORESET#0 is the same as (the new beam of) PRACH (the above-mentioned qCL is applied to the PDCCH). new QCL concept).

[0109] Figure 3 The first timing may be X symbols after the last symbol received in the first PDCCH of the DCI format in which the UE detects CRC scrambled by C-RNTI or MCS-C-RNTI in the search space set provided by the recovery search space ID (recoverySearchSpaceId).

[0110] Figure 3 The second timing may be the timing at which an activation command for the TCI state of the PDCCH is received for the cell that has performed CFRA BFR.

[0111] In addition, in this example, the UE assumes that after the first timing after the completion of CFRABFR, the new beam of the PDCCH for CORESET#0 is the same as (the new beam of) the PRACH (the above-mentioned q is applied in this PDCCH). new In this example, the UE receives an activation command for the TCI state of a CORESET other than CORESET#0 at the second timing. The UE may also continue to activate the TCI state based on the above QCL after the second timing. new The QCL is assumed to receive the PDCCH for CORESET#0.

[0112] According to the second embodiment described above, the UE can appropriately use the beam restored by CFRABFR for subsequent PDCCH reception.

[0113] <Other embodiments>

[0114] In addition, in Rel.16 / 17NR, the contents of the above-mentioned embodiments can be introduced into TS 38.213§6 Link recovery procedures in the same way as the BFR-related records of the physical layer so far, or can be recorded in other chapters (for example, TS 38.213§8 Random access procedure).

[0115] In addition, the above-mentioned embodiments can also be applied to UEs for which specific parameters are set through RRC. The specific parameters can be, for example, parameters for enabling BFR of Rel.16, or parameters for setting the actions of QCL or BFR for Rel.16 / 17 (for example, "QCL_-BFR_r16", "BFR_r16", "BFR_r17"). If the UE is not set with the specific high-level parameters, the UE can also follow the updated specifications of Rel.15 for the QCL assumption of PUCCH spatial relationship / PDCCH.

[0116] In addition, the above-mentioned embodiments may also be applied to a UE that has reported specific capability information to the network. The capability information may be, for example, capabilities related to the QCL assumption of BFR in a special cell (SpCell). When the UE that has reported the capability information implements BFR on the SpCell, it may also apply the above-mentioned at least one QCL assumption / spatial relationship assumption.

[0117] In addition, the first embodiment can also be used in the update of the spatial relationship for PUSCH after BFR. In this case, for example, the "PUCCH" and "PUCCH spatial relationship information (for PUCCH resources)" of the first embodiment can also be replaced by "PUSCH" and "PUSCH spatial relationship information (SRS spatial relationship information)". In addition, the UE can also assume that when there is an update of the spatial relationship of the PUCCH of the first embodiment, the spatial relationship of a specific PUSCH is also updated.

[0118] In addition, the second embodiment may also be used in the update of the QCL assumption for PDSCH after BFR. In this case, for example, the "PDCCH" of the second embodiment may also be replaced with "PDSCH". In addition, the UE may also assume that when there is an update of the QCL assumption for the PDCCH of the second embodiment, the QCL assumption for a specific PDSCH is also updated.

[0119] In addition, the PCell / PSCell of the present disclosure may be interchangeable with the SpCell. In addition, the SpCell may also refer to a cell other than the PCell / PSCell.

[0120] (Wireless Communication System)

[0121] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0122] Figure 4 1 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0123] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0124] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0125] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0126] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0127] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0128] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0129] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0130] Multiple base stations 10 may also be connected via wired (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0131] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also 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.

[0132] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0133] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), 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), etc. may be used.

[0134] The radio access scheme may also be referred to as a waveform. In addition, 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 radio access schemes for UL and DL.

[0135] As downlink channels, the wireless communication system 1 may use 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.

[0136] In addition, as uplink channels, 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)) and the like can also be used in the wireless communication system 1.

[0137] User data, high-layer control information, system information block (SIB), etc. are transmitted through PDSCH. User data, high-layer control information, etc. can also be transmitted through PUSCH. In addition, master information block (MIB) can also be transmitted through PBCH.

[0138] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0139] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be replaced by DL data, and the PUSCH may also be replaced by UL data.

[0140] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0141] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be interchangeable.

[0142] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted through PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted through PRACH.

[0143] In the present disclosure, downlink, uplink, etc. may be expressed without the word “link.” In addition, various channels may be expressed without the word “physical” at the beginning.

[0144] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As DL-RS, in the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0145] 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 SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0146] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0147] (Base Station)

[0148] Figure 51 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0149] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0150] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0151] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0152] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0153] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0154] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0155] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0156] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0157] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0158] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (Discrete Fourier Transform (DFT)) processing (as needed), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0159] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0160] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0161] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0162] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0163] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0164] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0165] In addition, the transmitting and receiving unit 120 may also receive a random access preamble code (a random access preamble code used for beam failure recovery) transmitted from the user terminal 20 when a beam failure is detected in a certain cell (for example, SpCell).

[0166] The control unit 110 can also be imagined as that the user terminal 20 monitors the downlink control channel in a certain control resource set using the quasi-co-location parameters of the antenna port that are the same as the quasi-co-location parameters of the antenna port associated with the index of the reference signal corresponding to the transmission of the random access preamble code (PRACH) after a certain period from the last codeword received from the initial downlink control channel in the downlink control information format of the cyclic redundancy check (CRC) encrypted by the cell-radio network temporary identifier (Cell Radio Network Temporary Identifier (C-RNTI)) or modulation coding scheme (Modulation Coding Scheme (MCS))-C-RNTI detected in the search space set provided by the recovery search space identifier (Identifier (ID)).

[0167] (User Terminal)

[0168] Figure 6 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. In addition, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided with one or more.

[0169] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0170] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0171] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0172] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0173] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0174] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0175] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0176] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0177] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0178] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0179] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0180] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0181] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0182] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0183] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also 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 also be output to the control unit 210.

[0184] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 , the transmitting and receiving antenna 230 , and the transmission path interface 240 .

[0185] In addition, the transmitting and receiving unit 220 may also send a random access preamble code (a random access preamble code used for beam failure recovery) in a certain cell (for example, SpCell) when a beam failure is detected.

[0186] The control unit 210 may also detect, in the search space set provided by the recovery search space identifier (Identifier (ID)), the last symbol received from the initial downlink control channel having a downlink control information format having a cyclic redundancy check (CRC) scrambled by a cell-radio network temporary identifier (Cell Radio Network Temporary Identifier (C-RNTI)) or a modulation coding scheme (Modulation Coding Scheme (MCS))-C-RNTI, and use the index (q) of the reference signal corresponding to the transmission of the random access preamble (PRACH) after a certain period (for example, X symbols). new ) is used to monitor the downlink control channel in a certain control resource set (and may also control the monitoring) by using the quasi-co-location parameters of the antenna port that is the same as the quasi-co-location parameters of the antenna port associated with the downlink control channel.

[0187] The certain control resource set may be all control resource sets in the cell except for a control resource set associated with the recovery search space ID.

[0188] The control unit 210 may also apply the same spatial filter as the last random access preamble code sent in the cell in the uplink control channel after the certain period and until receiving specific information related to the spatial relationship information of the uplink control channel, when the terminal is provided with spatial relationship information of the uplink control channel (PUCCH).

[0189] Here, the specific information related to the spatial relationship information of the uplink control channel may be, for example, at least one of an activation command for PUCCH spatial relationship information, a higher layer parameter (PUCCH-SpatialRelationInfo) for PUCCH spatial relationship information of PUCCH resources, and the like.

[0190] (Hardware Structure)

[0191] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0192] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0193] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 7 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0194] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. can be used interchangeably. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of the devices shown in the figure, or to exclude some of the devices.

[0195] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0196] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0197] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0198] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0199] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0200] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0201] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0202] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0203] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0204] In addition, the base station 10 and the user terminal 20 may also 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), and a field programmable gate array (FPGA), and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0205] (Variation Example)

[0206] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0207] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0208] Here, the parameter set may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filter processing performed by a transmitter and receiver in the frequency domain, a specific windowing processing performed by a transmitter and receiver in the time domain, and the like.

[0209] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0210] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0211] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be interchangeable.

[0212] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot 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 (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0213] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0214] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when 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.

[0215] In addition, when a time slot or a mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0216] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0217] In addition, a long TTI (e.g., normal TTI, subframe, etc.) may be replaced by a TTI having a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) may be replaced by a TTI having a TTI length shorter than that of the long TTI and longer than 1 ms.

[0218] 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 (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0219] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0220] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0221] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0222] Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, common RBs may also be identified by the index of the RB relative to the common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0223] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0224] At least one of the configured BWPs may be activated, and the UE may not assume that it transmits or receives a specific signal / channel other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced by "BWP".

[0225] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0226] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0227] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0228] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0229] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0230] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0231] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0232] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0233] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0234] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0235] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0236] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0237] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0238] 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", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0239] In the present disclosure, terms such as "Base Station (BS)", "wireless 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", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro-micro cell, and micro-micro cell.

[0240] A base station can accommodate one or more (for example, 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 also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0241] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0242] There are also cases where a mobile station is 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, hand set, user agent, mobile client, client or several other appropriate terms.

[0243] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device carried in a mobile body, a mobile body, etc. The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0244] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0245] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0246] In the present disclosure, operations are assumed to be performed by a base station, and sometimes by its upper node depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by a base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0247] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0248] The various modes / implementations described in the present disclosure may also be applied 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 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems expanded based on them. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0249] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0250] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0251] The term "determining" used in the present disclosure may include a variety of operations. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (for example, searching in a table, database or other data structure), ascertaining, etc. are regarded as performing "determining".

[0252] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0253] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as a situation where "judgment (decision)" is performed. That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as a situation where "judgment (decision)" is performed.

[0254] In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and so on.

[0255] The “maximum transmit power” recorded in the present disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0256] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be replaced by "access".

[0257] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0258] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0259] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0260] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0261] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: A transmitting unit, in case of detecting beam failure, transmitting a random access preamble in a cell in a non-contention random access CFRA process; and A control unit monitors PDCCHs in all control resource sets (CORESETs) in the cell using the quasi-co-location parameters (QCL parameters) of the antenna port that are the same as the index of the reference signal corresponding to the transmission of the random access preamble in the CFRA process, after a certain period from the last code element received in the initial downlink control channel (PDCCH) in the downlink control information format (DCI) format having a cyclic redundancy check (CRC) encrypted by the cell-radio network temporary identifier (C-RNTI) or the modulation and coding scheme-C-RNTI (MCS-C-RNTI) in the search space set provided by the recovery search space identifier (recovery search space ID).

2. The terminal according to claim 1, in, When the control unit is provided with the transmission setting indication state, i.e., TCI state, of the uplink control channel, i.e., PUCCH, the same spatial domain filter as that of the last random access preamble code sent in the cell is applied in the PUCCH after the certain period and until specific information related to the TCI state of the PUCCH is received.

3. A wireless communication method of a terminal, comprising: In case of detecting beam failure, the step of sending a random access preamble in the cell in a non-contention random access CFRA procedure; and A step of monitoring PDCCH in all control resource sets (CORESET) in the cell is performed after a certain period from the last code element received in the initial downlink control channel (PDCCH) in the downlink control information format (DCI) format having a cyclic redundancy check (CRC) encrypted by a cell-radio network temporary identifier (C-RNTI) or a modulation and coding scheme-C-RNTI (MCS-C-RNTI) is detected in the search space set provided by the recovery search space identifier (recovery search space ID), using the quasi-co-location parameters (QCL parameters) of the antenna port that are the same as the index of the reference signal corresponding to the transmission of the random access preamble code in the CFRA process, i.e., the quasi-co-location parameters (QCL parameters) of the antenna port.

4. A base station, comprising: a receiving unit, receiving, in a cell, a random access preamble code transmitted from a terminal in a non-contention random access CFRA procedure in a case where a beam failure is detected; and The control unit is assumed to be that the terminal detects the last code element of the initial downlink control channel, i.e., PDCCH, in the downlink control information format, i.e., DCI format, having a cyclic redundancy check, i.e., CRC, which is encrypted by a cell-radio network temporary identifier, i.e., C-RNTI, or a modulation and coding scheme-C-RNTI, i.e., MCS-C-RNTI, in the search space set provided by the recovery search space identifier, i.e., the recovery search space ID, and then monitors the PDCCH in all the control resource sets, i.e., CORESET, in the cell using the quasi-co-location parameters, i.e., QCL parameters, of the antenna port that are the same as the index of the reference signal corresponding to the transmission of the random access preamble code in the CFRA process.

5. A system having a terminal and a base station, The terminal has: A transmitting unit, in case of detecting beam failure, transmitting a random access preamble in a cell in a non-contention random access CFRA process; and A control unit, after a certain period from the last symbol received in the initial downlink control channel (PDCCH) in the downlink control information format (DCI) format having a cyclic redundancy check (CRC) scrambled by a cell-radio network temporary identifier (C-RNTI) or a modulation and coding scheme-C-RNTI (MCS-C-RNTI) in the search space set provided by the recovery search space identifier (recovery search space ID), monitors the PDCCH in all control resource sets (CORESET) in the cell using the quasi-co-location parameters (QCL parameters) of the antenna port that are the same as the quasi-co-location parameters (QCL parameters) of the antenna port associated with the index of the reference signal corresponding to the transmission of the random access preamble in the CFRA process, The base station has: A receiving unit receives the random access preamble code.

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