Terminal, wireless communication method, and base station

Abstract

A terminal according to an aspect of the present disclosure includes a transmission unit that transmits a random access preamble in a certain cell in a case where a beam failure is detected, and a control unit that assumes, as a quasi co-location parameter of an antenna port associated with an index of a reference signal corresponding to the random access preamble, a quasi co-location parameter of an antenna port that is the same as the quasi co-location parameter of the antenna port associated with the index of the reference signal, until a certain period of time after a time when contention resolution is successful in a random access procedure corresponding to the random access preamble, and until a period of time when certain information related to a transmission configuration indication (TCI) state of a downlink control channel is received. According to an aspect of the present disclosure, a beam can be appropriately updated in association with a BFR.

Description

Technical Field

[0001] This disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems. Background Technology

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

[0003] The development of successor systems to LTE is also underway (e.g., also known as the 5th generation mobile communication system (5G), 5G+, the 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.).

[0004] Existing technical documents

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 36.300V8.12.0 "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] The problem that the invention aims to solve

[0008] In NR, the process of user terminal (user terminal, user equipment (UE)) detecting beam failure (BF) and switching to other beams is being studied (which can also be called beam failure recovery (BFR) process, BFR, etc.).

[0009] However, the current Rel.16NR specification considers the scenario where a faulty beam is continued to be used after BFR (Banded Frame Relay). In this case, proper communication is impossible, and there are concerns about reduced throughput or degraded communication quality.

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

[0011] Methods for solving problems

[0012] One aspect of this disclosure relates to a terminal comprising: a transmitting unit that, upon detecting a beam failure, transmits a random access preamble in a cell; and a control unit that, after a specific period following the successful resolution of a competition in the random access process corresponding to the random access preamble, and until receiving specific information related to the transmit setting indication state (TCI) state of the downlink control channel, envisions the quasi-co-address parameters of the antenna ports, which are identical to the quasi-co-address parameters of the antenna ports associated with the index of the reference signal corresponding to the random access preamble, as being used for monitoring the downlink control channel of a certain control resource set.

[0013] Invention Effects

[0014] According to one method of this disclosure, the beam can be appropriately updated in association with the BFR. Attached Figure Description

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

[0016] Figure 2 This is a diagram showing the 4-step RACH process.

[0017] Figure 3 This is a diagram illustrating the flow of the 2-step RACH process.

[0018] Figure 4 This is a diagram illustrating an example of updating the spatial relationships for PUCCH after CBRA BFR in the first embodiment.

[0019] Figure 5This is a diagram illustrating an example of an update to the QCL concept for PDCCH following CBRA BFR in the second embodiment.

[0020] Figure 6 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment.

[0021] Figure 7 This is a diagram illustrating an example of the structure of a base station according to one embodiment.

[0022] Figure 8 This is a diagram illustrating an example of the structure of a user terminal according to one embodiment.

[0023] Figure 9 This is a diagram illustrating an example of the hardware structure of a base station and a user terminal according to one embodiment. Detailed Implementation

[0024] (Beam failure recovery)

[0025] In NR, beamforming is being explored for communication. For example, UEs and base stations (e.g., gNodeB (gNB)) can use beams used in signal transmission (also known as transmit beams, Tx beams, etc.) and beams used in signal reception (also known as receive beams, Rx beams, etc.).

[0026] When using beamforming, the system is susceptible to interference from obstacles, thus potentially degrading radio link quality. This degradation in quality raises concerns about frequent Radio Link Failures (RLFs). Since RLFs necessitate cell reconnection, frequent RLFs can lead to reduced system throughput.

[0027] In Natural Radio Networks (NR), to suppress Resonant Beam Failure (RLF) generation, research is underway on implementing a switch to other beams (also known as Beam Recovery (BR), Beam Failure Recovery (BFR), L1 / L2 (Layer 1 / Layer 2) beam recovery, etc.) when specific beam quality deteriorates. Furthermore, the BFR procedure can also be simply referred to as BFR.

[0028] Additionally, beam failure (BF) in this disclosure can also be referred to as link failure or radio link failure (RLF).

[0029] Figure 1This diagram illustrates an example of the beam recovery process in Rel.15NR. The number of beams is just one example; it is not limited to this. Figure 1 In the initial state (step S101), the UE performs a measurement based on the reference signal (RS) resources transmitted using two beams.

[0030] The RS can also be at least one of a Synchronization Signal Block (SSB) and a Channel State Information RS (CSI-RS). Additionally, the SSB can also be referred to as an SS / PBCH (Physical Broadcast Channel) block, etc.

[0031] The RS can also be at least one of the following: Primary SS (PSS), Secondary SS (SSS), Mobility Reference Signal (MRS), signals contained in the SSB, SSB, CSI-RS, DeModulation Reference Signal (DMRS), beam-specific signals, etc., or a signal formed by extending or modifying them. The RS measured in step S101 can also be referred to as the Beam Failure Detection RS (BFD-RS), etc.

[0032] In step S102, the UE cannot detect the BFD-RS (or the RS reception quality is degraded) because the radio waves from the base station are obstructed. Such obstruction may be caused by obstacles, fading, interference, etc. between the UE and the base station.

[0033] If specific conditions are met, the UE detects a beam failure. For example, if the Block Error Rate (BLER) is less than a threshold for all configured BFD-RS (BFD-RS resource settings), the UE can also detect a beam failure. If a beam failure is detected, the UE's lower layer (PHY layer) can also notify (indicate) the higher layer (MAC layer) of the beam failure instance.

[0034] Furthermore, the benchmark (standard) for judgment is not limited to BLER; it can also be the reference signal received power in the physical layer (Layer 1 Reference Signal Received Power (L1-RSRP)). Additionally, beam failure detection can be implemented based on the downlink control channel (Physical Downlink Control Channel (PDCCH)) or on the basis of RS measurement, either instead of RS measurement. BFD-RS can also be expected to be quasi-co-located (QCL) with the DMRS of the PDCCH monitored by the UE.

[0035] Here, QCL is an indicator representing the statistical properties of a channel. For example, if a signal / channel has a QCL relationship with other signals / channels, it can also mean that at least one of the following is the same (with regard to at least one of them, QCL) among these different signals / channels: Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx filter / parameter, spatial Tx(transmission) filter / parameter).

[0036] Additionally, the spatial reception parameters may also correspond to the UE's receive beam (e.g., receive 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 this disclosure may also be replaced with the spatial QCL (sQCL).

[0037] Information related to BFD-RS (e.g., RS index, resources, quantity, number of ports, precoding, etc.) and information related to beam failure detection (BFD) (e.g., the aforementioned thresholds) can also be set (notified) to the UE using higher-layer signaling. Information related to BFD-RS can also be referred to as information related to BFR resources, etc.

[0038] In this disclosure, higher-level signaling may be, for example, any one or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc.

[0039] MAC signaling can also use MAC Control Element (CE) or MAC Protocol Data Unit (PDU). Broadcast information can also be, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), or Other System Information (OSI).

[0040] The UE's MAC layer can also start a specific timer (also known as a beam failure detection timer) upon receiving a beam failure instance notification from the UE's PHY layer. The UE's MAC layer can also trigger a 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 via RRC) before the timer expires.

[0041] Even in the absence of notification from the UE (e.g., the absence of notification exceeds a certain time), or in the presence of a specific signal received from the UE (beam recovery request in step S104), the base station can also determine that the UE has detected a beam failure.

[0042] In step S103, the UE begins searching for a new candidate beam for communication in order to restore the beam. The UE can also select a new candidate beam corresponding to a specific RS by measuring that RS. The RS measured in step S103 can also be referred to as the RS used for new candidate beam identification (New Candidate Beam Identification RS: NCBI-RS), CBI-RS, Candidate Beam RS (CB-RS), etc. NCBI-RS can be the same as or different from BFD-RS. Furthermore, the new candidate beam can also be referred to as a new candidate beam, a candidate beam, or a new beam.

[0043] The UE can also select the beam corresponding to an RS that meets specific conditions as a new candidate beam. For example, the UE can also select a new candidate beam based on RSs in the set NCBI-RS whose L1-RSRP exceeds a threshold. Furthermore, the criterion for judgment is not limited to L1-RSRP. At least one of L1-RSRP, L1-RSRQ, and L1-SINR (Signal-to-Noise Interference Power Ratio) can be used. L1-RSRP associated with SSB can also be referred to as SS-RSRP. L1-RSRP associated with CSI-RS can also be referred to as CSI-RSRP. Similarly, L1-RSRQ associated with SSB can also be referred to as SS-RSRQ. L1-RSRQ associated with CSI-RS can also be referred to as CSI-RSRQ. Furthermore, L1-SINR associated with SSB can also be referred to as SS-SINR. L1-SINR associated with CSI-RS can also be referred to as CSI-SINR.

[0044] Information related to NCBI-RS (e.g., RS resources, quantity, number of ports, precoding, etc.) and information related to the New Candidate Beam Identifier (NCBI) (e.g., the aforementioned threshold) can also be set (notified) to the UE using higher-layer signaling. 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.

[0045] In addition, BFD-RS, NCBI-RS, etc. can also be replaced by RadioLink Monitoring Reference Signal (RLM-RS).

[0046] In step S104, the UE that has determined the new candidate beam sends a Beam Failure Recovery reQuest (BFRQ). The Beam Failure Recovery reQuest can also be referred to as a Beam Recovery Request signal, Beam Failure Recovery Request signal, etc.

[0047] BFRQ can also be transmitted using a random access channel (Physical Random Access Channel: PRACH). BFRQ can also include information about the new candidate beam determined in step S103. Resources used for BFRQ can also be associated with this new candidate beam. Beam information can also be communicated using a beam index (BI), a port index of a specific reference signal, a resource index (e.g., a CSI-RS Resource Indicator (CRI), an SSB Resource Indicator (SSBRI)), etc.

[0048] In Rel.15NR, BFR based on a contention-based random access (CFRA) procedure, namely CB-BFR (Contention-Based BFR), and BFR based on a non-contention-free random access (CBRA) procedure, namely CF-BFR (Contention-Free BFR). In both CB-BFR and CF-BFR, the UE can also use PRACH resources to transmit preambles (also known as RA preambles, random access channel (Physical Random Access Channel: PRACH), RACH preambles, etc.) as BFRQ.

[0049] Additionally, CF-BFR can also be referred to as CFRA BFR. CB-BFR can also be referred to as CBRA BFR.

[0050] In step S105, the base station that detected the BFRQ sends a response signal (also referred to as a BFR response, gNB response, etc.) to the BFRQ from the UE. This response signal may also contain reconstruction information for one or more beams (e.g., configuration information of DL-RS resources).

[0051] The response signal can also be transmitted, for example, in the UE common search space of the PDCCH. The response signal can also be notified using a PDCCH (DCI) with a Cyclic Redundancy Check (CRC) scrambled with the UE's identifier (e.g., Cell-Radio RNTI NetworkTemporary Identifier (C-RNTI)). The UE can also determine the transmitted and received beams used based on beam reconstruction information.

[0052] The UE can also monitor the response signal based on at least one of the Control Resource Set (CORESET) used by the BFR and the search space set used by the BFR. For example, the UE can also detect the DCI with a CRC scrambled by C-RNTI in the BFR search space within a separately configured CORESET.

[0053] Regarding CB-BFR, if the UE receives the PDCCH corresponding to its own C-RNTI, it can also be determined that the contention resolution has been successful.

[0054] The processing in step S105 can also be configured to allow the UE to monitor the response from the base station (e.g., gNB) to the BFRQ. This period can be referred to as, for example, the gNB response window, the beam recovery request response window, the BFRQ response window, etc. If no gNB response is detected during this window period, the UE can also retransmit the BFRQ.

[0055] In step S106, the UE may also send a message to the base station indicating that beam reconfiguration is complete. This message can be sent via either PUCCH or PUSCH.

[0056] In step S106, the UE can receive either RRC signaling indicating the setting of the Transmission Configuration Indication state (TCI state) used for PDCCH, or MAC CE indicating the activation of the setting.

[0057] A beam recovery success (BR success) could also indicate, for example, that step S106 has been reached. On the other hand, a beam recovery failure (BR failure) could also be equivalent to the BFRQ transmission reaching a certain number of times, or the beam-failure-recovery-timer expiring.

[0058] Furthermore, the numbering of these steps is merely for illustrative purposes; multiple steps can be combined or their order can be changed. Additionally, whether or not to implement BFR can be configured for the UE using higher-layer signaling.

[0059] (CBRA)

[0060] In NR, the Contention-Based Random Access (CBRA) procedure, which is also used in the aforementioned CB-BFR, includes a 4-step CBRA procedure specified in Rel. 15 and a 2-step CBRA procedure specified in Rel. 16. The former can also be referred to as the 4-step RACH, and the latter as the 2-step RACH, etc.

[0061] Figure 2 This is a diagram illustrating the 4-step RACH process. In the 4-step RACH, the UE first sends message 1 (Random Access Preamble). The base station returns message 2 to the UE containing a response (Random Access Response (RAR)) corresponding to message 1.

[0062] In addition, the DCI format of the scheduled RAR has a CRC scrambled by the RNTI (RA-RNTI) used for random access.

[0063] Based on the UL authorization represented by the RAR, the UE uses message 3 to send the UE identifier (ID) for contention resolution. This UE ID can also be, for example, a Short (or SAE) Temporary Mobile Subscriber Identity (S-TMSI).

[0064] When the UE is in an idle state (RRC_IDLE state) (the case of an idle UE), message 3 contains a Common Control Channel Service Data Unit (CCCH SDU). The CCCH is a logical channel used when an RRC connection does not exist. The CCCH SDU can also transmit RRC messages containing the UE ID (e.g., RRC connection requests).

[0065] When the UE is a connected UE (connected UE, UE in RRC_CONNECTED state), message 3 may also include C-RNTI (MAC CE for notifying C-RNTI).

[0066] If the UE ID notified via message 3 does not conflict with other UEs, the base station returns message 4 containing the contention resolution ID to the UE.

[0067] Figure 3 This is a diagram illustrating the flow of a 2-step RACH. In a 2-step RACH, the UE first sends message A. Message A consists of a time-division multiplexed preamble and a PUSCH, equivalent to message 1+3 of a 4-step RACH. The aforementioned UE ID can also be sent in this PUSCH.

[0068] After receiving message A, the base station returns message B to the terminal. Message B consists of PDSCH (and the PDCCH that schedules the PDSCH), equivalent to message 2+4 of the 4-step RACH. Message B may also include a summary of the RAR and contention resolution ID.

[0069] Additionally, the DCI format for UE scheduling message 4 or message B can also have a CRC scrambled by temporary C-RNTI (TC-RNTI) when the UE is an idle UE, and a CRC scrambled by C-RNTI when the UE is a connected UE.

[0070] An idle UE that has received message 4 or message B can consider CBRA successful (contention resolved) if it successfully decodes the received message and the content of the contention resolution ID in the message matches the content of the CCCH SDU sent in message 3 or message A. Furthermore, the UE can also send a HARQ-ACK for the received message. The base station receiving the HARQ-ACK can also set the aforementioned TC-RNTI value in the UE's C-RNTI.

[0071] A connected UE that receives message 4 or message B may also consider CBRA successful (contention resolved) if the DCI (PDCCH) of the received message indicates the above-mentioned C-RNTI and contains a UL license for new transmission.

[0072] In addition, Figure 1 In the BFR procedure, in the case of CBRA BFR, the BFRQ transmission in step S104 is equivalent to the transmission of message 1 or message A. Furthermore, in the case of CBRA BFR, the BFR acknowledgment reception in step S105 is equivalent to the reception of message 4 or message B (and the reception of the DCI that schedules them).

[0073] (QCL conception of PDCCH after BFR, spatial relationship of PUCCH)

[0074] In the Rel.16NR specification studied to date (TS 38.213V16.0.0§6 Link recovery procedures), the following is recorded regarding the update of the QCL (beam) used for PDCCH after BFR:

[0075] • For PDCCH monitoring and corresponding PDSCH reception within the search space set provided by the recovery search space ID (recoverySearchSpaceId), up to the point where the UE receives the activation of the TCI state or the parameters of the list of TCI states used by the PDCCH (tci-StatesPDCCH-ToAddList, tci-StatesPDCCH-ToReleaseList, etc.) via higher layers, the UE can also envision index q. new The quasi-collocation parameters of the associated antenna ports are the same. (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 associated with index q.) newuntil the UE receives by higher layers an activation for aTCI state or any of the parameters tci-StatesPDCCH-ToAddList and / or tci-StatesPDCCH-ToReleaseList),

[0076] For the primary cell (PCell) or primary / secondary cell (PSCell), after the UE detects the CRC of the initial PDCCH received via C-RNTI or Modulation Coding Scheme C-RNTI (MCS-C-RNTI) scrambled DCI format in the search space set provided by the recovery search space ID (recoverySearchSpaceId) for the last 28 symbols, in order to monitor the PDCCH in the CORESET of index 0, the UE can also envision the index q. new 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 where a UE detects a DCI format with CRC scrambled by C-RNTI or MCS-C-RNTI, the UE assumes the same antennaport quasi-collocation parameters as the ones associated with index q. new forPDCCH monitoring in a CORESET with index 0.).

[0077] Furthermore, in the aforementioned Rel.16NR specification, the following is stated regarding the update of spatial relationships (beams) for PUCCH after BFR:

[0078] For the PCell or the PSCell, after the UE detects 28 symbols from the last symbol of a first PDCCH reception in a search space set provided by recoverySearchSpaceId, where 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 Relation Information (PUCCH-SpatialRelationInfo) or is provided with PUCCH resources, the UE may also transmit PUCCH in the same cell as the cell that transmitted PRACH using the following transmission conditions: PUCCH-SpatialRelationInfo or is provided PUCCH-SpatialRelationInfo for PUCCH resource(s), the UE transmits a PUCCH on a samecell as the PRACH transmission using):

[0079] • Use the same spatial filter as for the last PRACH transmission.

[0080] • In the formula used to determine the transmit power of PUCCH (Subclause 7.2.1 of TS 38.213), the transmit power is determined using q. u =0, q d =q new The power determined by l=0 (as described in sub-clause 7.2.1, where q) u=0,q d =q new , l=0(a power determined as described in Clause 7.2.1with q u =0,q d =q new (l=0)).

[0081] In addition, q new It could 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 via the corresponding PRACH (or the index of a new beam discovered during the BFR process).

[0082] Under normal circumstances, q u It can also represent the PUCCH ID (p0-PUCCH-Id) of the PUCCH using P0 within the P0 set (p0-Set). It can also be referred to as the index of the power control adjustment state, the index of the PUCCH power control adjustment state, the closed-loop index, etc. d It can also be an index of the path loss reference RS (e.g., set via PUCCH-PathlossReferenceRS).

[0083] Due to the provisions mentioned above, for PDCCH / PUCCH, during the period from the completion of the RA process for BFR to the setting / activation of the explicit beam, transmission and reception processing based on an ambiguous beam can be avoided, thus suppressing the degradation of communication quality.

[0084] However, the above provisions assume CFRA BFR. Therefore, after CFRA BFR is completed, the PDCCH / PUCCH beams are not updated, faulty beams continue to be used, and proper communication cannot be carried out, raising concerns about reduced throughput or degraded communication quality.

[0085] Therefore, the inventors of this invention have conceived of a method for appropriately updating the beam in association with the BFR.

[0086] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods involved in each embodiment can be applied individually or in combination.

[0087] In this disclosure, "A / B" and "at least one of A and B" may be used interchangeably.

[0088] In this disclosure, indexes, IDs, indicators, resource IDs, etc., can also be used interchangeably.

[0089] (Wireless communication method)

[0090] <First Implementation>

[0091] In the first embodiment, the UE updates the spatial relationship of the PUCCH after the CBRA BFR is completed.

[0092] In the first embodiment, the update of the spatial relationships for PUCCH after BFR can also be performed as follows:

[0093] • For the PCell or the PSCell, after X symbols of successful contention resolution (or successful completion of contention-based random access procedure for beam failure recovery), and until the UE receives an activation command for PUCCH-SpatialRelationInfo or is provided PUCCH-SpatialRelationInfo for PUCCH resource(s), the UE transmits a PUCCH on a same cell as the PRACH transmission using the following transmission conditions:

[0094] • Use the same spatial filter as for the last PRACH transmission.

[0095] • In the formula used to determine the transmit power of PUCCH (Subclause 7.2.1 of TS 38.213), the transmit power is determined using q. u =0, q d=q newCBRA (or q) new The power determined by factors such as l=0 (as described in sub-clause 7.2.1, where q) u =0,q d =q newCBRA (or q) new ), l=0, and...(a power determined as described in Clause 7.2.1with q u =0,q d =q newCBRA (or q new ), l=0, and…).

[0096] In addition, q newCBRA (or q) new It can also be the index of a new candidate beam (e.g., SSB / CSI-RS) selected by the UE during the CBRA BFR process and reported to the network via the corresponding PRACH (or the index of a new beam discovered during the BFR process). In other words, q newCBRA (or q) new It can also be equivalent to an index of the SS / PBCH block provided by a higher layer (e.g., the MAC layer).

[0097] Furthermore, the aforementioned X can be determined in advance through specifications (e.g., X = 28), or it can be set through higher-layer signaling, or it can be determined based on UE capabilities (e.g., UE capabilities related to BFR).

[0098] In addition, the phrase “after X symbols of successful completion of contention-based random access procedure for beam failure recovery” can be interchanged with “after X symbols of successful completion of contention-based random access procedure for beam failure recovery”.

[0099] Additionally, the phrase "after X symbols from a successful contention resolution" in this disclosure can also be interchanged with "after X symbols from a last symbol of a first PDCCH reception (of Msg.4 or MsgB) where the UE detects a DCI format with CRC scrambled by C-RNTI and contains a UL grant for a new transmission".

[0100] The disclosed phrase "after X symbols successfully resolved" can also be interchanged with "after X symbols from a last symbol of a first PDCCH reception (of Msg.4 or MsgB) where the UE detects a DCI format with CRC scrambled by TC-RNTI". Here, the TC-RNTI can also be replaced with other RNTIs (e.g., RNTI for message B (MsgB-RNTI)).

[0101] The phrase "after X symbols of successful contention resolution" in this disclosure can also be replaced with "after X symbols of successful contention resolution if BFR MAC CE is contained in Msg3 or MsgA of contention-based random access procedure (if BFR MAC CE is contained in Msg3 or MsgA of contention-based random access procedure)". Furthermore, it is clear that these substitutions can be applied to the second embodiment, or multiple substitutions can be performed simultaneously.

[0102] That is, if message 3 or message A of a CBRA contains a BFR MAC CE, the UE can also update the spatial relationship of the PUCCH after the CBRA is completed. In this case, the base station can identify whether these messages are for CBRA BFR or other CBRAs based on whether message 3 or message A contains a BFR MAC CE. Therefore, it is possible to control PUCCH transmission and reception based on whether both the base station and the UE have identified the completion of CBRA BFR.

[0103] Alternatively, the BFR MAC CE in this disclosure may also be a MAC CE that includes information identifying cells where beam failure has been detected (e.g., PCell, PSCell, SCell, etc.). The MAC CE may also include information on new candidate beams (candidate RSs) (e.g., SSB index, CSI-RS index).

[0104] Furthermore, the phrase "until the UE receives an activation command for PUCCH-SpatialRelationInfo or is provided PUCCH-SpatialRelationInfo for PUCCH resource(s)" in this disclosure can also be replaced with "until the UE receives an activation command for PUCCH-SpatialRelationInfo and if PUCCH-SpatialRelationInfo is provided for PUCCH resource(s)"

[0105] Furthermore, when a UE receives a DCI (PDCCH) scrambled with CRC via TC-RNTI for scheduling message 4 or message B, the UE can be considered either an idle UE implementing CBRA BFR, or a connected UE that sent a value different from the C-RNTI (e.g., a random value, a new TC-RNTI, etc.) in message 3 or message A. For the latter, the base station can also treat the connected UE as an idle UE without an assigned C-RNTI, and can control the generation / transmission of message 4 or message B based on the aforementioned random value.

[0106] Figure 4 This diagram illustrates an example of updating the spatial relationship of the PUCCH after CBRA BFR in the first embodiment. In this example, the UE assumes that during the first timing period after CBRA BFR is completed, to the second timing period, the new beam of the PUCCH is the same as the new beam of the PRACH (using the transmission conditions described above in the transmission of the PUCCH).

[0107] Figure 4 The first timing can also be after the UE detects that the CRC has been scrambled by C-RNTI and that the initial message 4 of the PDCCH has been received after the last symbol of the new transmission is X symbols.

[0108] Figure 4 The second timing can also be the timing for receiving an activation command for PUCCH spatial relation information for a cell that has undergone CBRA BFR.

[0109] According to the first embodiment described above, the UE can appropriately utilize the beam recovered through CBRA BFR for subsequent PUCCH transmission.

[0110] <Second Implementation>

[0111] In the second embodiment, the UE updates the QCL of the PDCCH after the CBRA BFR is completed.

[0112] In the second embodiment, the update of the QCL concept for PDCCH after BFR can also be performed as follows:

[0113] For PCell or PSCell, after a successful contention-resolved X symbol, if the UE detects that the CRC is scrambled via C-RNTI or MCS-C-RNTI in DCI format, up to the point where the UE receives the activation of the TCI state or the list of TCI states used by the PDCCH (tci-StatesPDCCH-ToAddList, tci-StatesPDCCH-ToReleaseList, etc.) from a higher layer, the UE can also use the index q... newThe quasi-collocation parameters of the associated antenna ports are assumed to be used for monitoring the PDCCH (and corresponding PDSCH reception) in a certain CORESET. (For the PCell or the PSCell, after X symbols of successful contention resolution, when a UE detects a DCI format with CRC scrambled by C-RNTI or MCS-C-RNTI, the UE assumes the same antenna port quasi-collocation parameters as the ones associated with index q.) new for PDCCH monitoring in a CORESET(andfor corresponding PDSCH reception)until the UE receives by higher layers anactivation for a TCI state or any of the parameters tci-StatesPDCCH-ToAddListand / or tci-StatesPDCCH-ToReleaseList),

[0114] • For PCell or PSCell, after a successful contention-resolved X symbol, if the UE detects that the CRC is scrambled via C-RNTI or MCS-C-RNTI in DCI format, the UE can also use index q. newThe quasi-colocation parameters of the associated antenna ports are assumed to be the same for monitoring (and receiving) the PDCCH in the CORESET (or CORESET with index 0) of controlResourceSetZero. (For the PCell or the PSCell, after X symbols of successful contention resolution, when a UE detects a DCI format with CRC scrambled by C-RNTI or MCS-C-RNTI, the UE assumes the same antenna port quasi-colocation parameters as the ones associated with index q.) new for PDCCH monitoring in controlResourceSetZero(orin aCORESET with index 0)(and for corresponding PDSCH reception)).

[0115] Here, "a certain CORESET" can also be any CORESET, all CORESETs, a specific CORESET, or at least one CORESET other than CORESET#0. In addition, CORESET#0 can be either a CORESET set by the high-level parameter controlResourceSetZero, or it can refer to the CORESET with index 0.

[0116] Additionally, the condition in the above update, "when the UE detects that the CRC is scrambled in DCI format via C-RNTI or MCS-C-RNTI," can also be omitted.

[0117] Furthermore, the aforementioned X can be determined in advance through specifications (e.g., X = 28), set through higher-layer signaling, or determined based on UE capabilities (e.g., UE capabilities related to BFR). The X in the first embodiment and the X in the second embodiment can be different values ​​or the same value.

[0118] As described above, when "after the successful contention resolution of X symbols" is replaced with "after the successful contention resolution of X symbols if message 3 or message A of the CBRA contains BFR MAC CE," the UE can also update the QCL assumption of the PDCCH after the CBRA is completed, provided that message 3 or message A of the CBRA contains BFR MAC CE. In this case, the base station can identify whether these messages are for CBRA BFR or for other CBRAs based on whether message 3 or message A contains BFR MAC CE. Therefore, it is possible to control PDCCH transmission and reception based on whether both the base station and the UE have identified the completion of CBRA BFR.

[0119] Figure 5 This diagram illustrates an example of an update to the QCL concept for the PDCCH following CBRA BFR in the second embodiment. In this example, the UE envisions that, during the first timing period following the completion of CBRA BFR to the second timing period, the new beam for the PDCCH of a CORESET other than CORESET#0 is the same as the new beam for the PRACH (the aforementioned QCL is applied in this PDCCH). new (QCL concept).

[0120] Figure 5 The first timing can also be after the UE detects that the CRC has been scrambled via C-RNTI and that the initial message 4 of the PDCCH has been received after the last symbol of the scrambled CRC message in the DCI format containing the UL-licensed UL for new transmission.

[0121] Figure 5 The second timing can also be the timing for receiving the activation command for the TCI state of the PDCCH for a cell that has undergone CBRA BFR.

[0122] Furthermore, in this example, the UE envisions that, after the first timing following the completion of CBRA BFR, the new beam for the PDCCH used in CORESET#0 is the same as the new beam for the PRACH (the aforementioned q is applied in this PDCCH). new (QCL assumption). In this example, the UE receives an activation command for the TCI state of a CORESET that is not CORESET#0 at the second timing. The UE can also continue to use the above-mentioned QCL after the second timing. new The QCL is designed to receive the PDCCH for CORESET#0.

[0123] According to the second embodiment described above, the UE can appropriately utilize the beam recovered through CBRA BFR for subsequent PDCCH reception.

[0124] <Other Implementation Methods>

[0125] Furthermore, in Rel.16NR, the contents of the above-described embodiments can be incorporated into TS 38.213 §6 Link recovery procedures in the same way as the descriptions associated with the physical layer BFR to date, or they can be described in other chapters (e.g., TS 38.213 §8 Random access procedure). In the latter case, it can also be stated in §6 that the CBRA BFR is described in that other chapter.

[0126] Furthermore, the above-described embodiments can also be applied to UEs with specific parameters set via RRC. These specific parameters can be, for example, parameters that enable BFR in Rel.16, or parameters used to set the operation of QCL or CBRA BFR for Rel.16 (e.g., "QCL_CBRA-BFR_r16").

[0127] Furthermore, the above-described embodiments can also be applied to UEs that have reported specific capability information to the network. This capability information may, for example, be the capability related to the QCL assumption of CBRA BFR in a Special Cell (SpCell). When a UE that has reported this capability information implements CBRA BFR on the SpCell, it can also apply at least one of the above-described QCL assumptions / spatial relationship assumptions.

[0128] Furthermore, the PCell / PSCell disclosed herein can be used interchangeably with SpCell. Additionally, SpCell can also refer to a cell other than PCell / PSCell.

[0129] (Wireless Communication System)

[0130] The structure of a wireless communication system according to one embodiment of this disclosure will now be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of this disclosure.

[0131] Figure 6This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment. The wireless communication system 1 can also be a system that uses Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) as standardized by the Third Generation Partnership Project (3GPP).

[0132] Furthermore, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0133] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0134] Wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (e.g., MN and SN are dual connectivity of NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0135] The wireless communication system 1 may also include a base station 11 forming a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a-12c) configured within the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration and number of each cell and the user terminal 20 are not limited to the arrangement shown in the figure. Hereinafter, without distinguishing between base stations 11 and 12, they will be collectively referred to as base station 10.

[0136] User terminal 20 may also connect to at least one of multiple base stations 10. User terminal 20 may also utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0137] Each CC can 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)). Macro cell C1 can also be included in FR1, and small cell C2 can also be included in FR2. For example, FR1 can also be a frequency band below 6 GHz (sub-6 GHz), and FR2 can also be a frequency band above 24 GHz (above-24 GHz). Furthermore, the frequency bands and definitions of FR1 and FR2 are not limited to these; for example, FR1 can also be equivalent to a frequency band higher than FR2.

[0138] In addition, user terminal 20 can also use at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) to communicate in each CC.

[0139] Multiple base stations 10 can also be connected via wired (e.g., fiber optic cable based on the 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, base station 11, which is equivalent to a host station, can also be referred to as an Integrated Access Backhaul (IAB) donor, and base station 12, which is equivalent to a relay station, can also be referred to as an IAB node.

[0140] Base station 10 may also be connected to core network 30 via other base stations 10 or directly. Core network 30 may include, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0141] User terminal 20 can also be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0142] In wireless communication system 1, wireless access methods based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of the downlink (DL) and uplink (UL) links, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA) can also be used.

[0143] The wireless access method can also be referred to as a waveform. In addition, in the wireless communication system 1, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be used in the wireless access methods of UL and DL.

[0144] As a downlink channel, the wireless communication system 1 can also use downlink shared channels (Physical Downlink Shared Channel (PDSCH)), broadcast channels (Physical Broadcast Channel (PBCH)), downlink control channels (Physical Downlink Control Channel (PDCCH)) and so on, which are shared by each user terminal 20.

[0145] In addition, as uplink channels, the wireless communication system 1 may also use uplink shared channels (Physical Uplink Shared Channel (PUSCH)), uplink control channels (Physical Uplink Control Channel (PUCCH)), random access channels (Physical Random Access Channel (PRACH)) and so on, which are shared by each user terminal 20.

[0146] User data, high-level control information, and System Information Blocks (SIBs) are transmitted via the PDSCH. User data and high-level control information can also be transmitted via the PUSCH. Furthermore, the Master Information Block (MIB) can also be transmitted via the PBCH.

[0147] Lower-layer control information can also be transmitted via PDCCH. Lower-layer control information may include, for example, downlink control information (DCI), which includes scheduling information for at least one of PDSCH and PUSCH.

[0148] Additionally, the DCI that schedules PDSCH can also be called DL allocation, DL DCI, etc., and the DCI that schedules PUSCH can also be called UL authorization, UL DCI, etc. Furthermore, PDSCH can also be replaced with DL data, and PUSCH can also be replaced with UL data.

[0149] In PDCCH detection, a Control Resource Set (CORESET) and a search space can be utilized. A CORESET corresponds to the resources used to search for DCIs. The search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor CORESETs associated with a specific search space based on search space settings.

[0150] A search space can also correspond to one or more PDCCH candidates equivalent to one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, the terms "search space", "search space set", "search space setting", "search space set setting", "CORESET", and "CORESET setting" used in this disclosure can be used interchangeably.

[0151] Uplink control information (UCI) including at least one of Channel State Information (CSI), delivery confirmation information (such as Hybrid Automatic Repeat reQuest ACK knowledgement (HARQ-ACK), ACK / NACK, etc.), and Scheduling Request (SR) can also be transmitted via PUCCH. Random access preambles used for establishing a connection with the cell can also be transmitted via PRACH.

[0152] Furthermore, in this disclosure, downlink, uplink, etc., may be described without the word "link". Additionally, various channels may be described without the word "physical".

[0153] In wireless communication system 1, synchronization signals (SS) and downlink reference signals (DL-RS) can also be transmitted. As DL-RS, wireless communication system 1 can also transmit cell-specific reference signals (CRS), channel state information reference signals (CSI-RS), demodulation reference signals (DMRS), positioning reference signals (PRS), phase tracking reference signals (PTRS), etc.

[0154] Synchronization signals can be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be called an SS / PBCH block, SS block (SSB), etc. Furthermore, SS, SSB, etc., can also be called reference signals.

[0155] Furthermore, in the wireless communication system 1, the uplink reference signal (UL-RS) can also transmit measurement reference signals (sounding reference signals (SRS)) and demodulation reference signals (DMRS). Additionally, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific reference signal).

[0156] (Base station)

[0157] Figure 7 This diagram illustrates an example of the structure of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmit / receive unit 120, a transmit / receive antenna 130, and a transmission path interface (transmission line interface) 140. Alternatively, the control unit 110, the transmit / receive unit 120, the transmit / receive antenna 130, and the transmission path interface 140 may each be provided in more than one manner.

[0158] Furthermore, while this example primarily illustrates the functional blocks of the characteristic portions of this embodiment, it can also be envisioned that the base station 10 also possesses other functional blocks required for wireless communication. Some of the processing of each unit described below may also be omitted.

[0159] The control unit 110 performs overall control of the base station 10. The control unit 110 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the art to which this disclosure pertains.

[0160] The control unit 110 can also control signal generation and scheduling (e.g., resource allocation, mapping). The control unit 110 can also control transmission, reception, and measurement using the transmit / receive unit 120, transmit / receive antenna 130, and transmission path interface 140. The control unit 110 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmit / receive unit 120. The control unit 110 can also perform call processing (setting, releasing, etc.) of the communication channel, status management of the base station 10, and management of wireless resources.

[0161] The transmitting / receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting / receiving unit 120 can be composed of transmitters / receivers, RF circuits, baseband circuits, filters, phase shifters, measurement circuits, transmitting / receiving circuits, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0162] The transmitting and receiving unit 120 can be configured as a single integrated transmitting and receiving unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 1211 and an RF unit 122. The receiving unit can also be composed of a receiving processing unit 1212, an RF unit 122, and a measurement unit 123.

[0163] The transmitting and receiving antenna 130 can be constructed from an antenna, such as an array antenna, as described based on common knowledge in the art to which this disclosure pertains.

[0164] The transmitting / receiving unit 120 can also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 can also receive the aforementioned uplink channel, uplink reference signal, etc.

[0165] The transmitting and receiving unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0166] The transmitting and receiving unit 120 (transmitting processing unit 1211) may, for example, perform processing at the Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer (e.g., RLC retransmission control), and Medium Access Control (MAC) layer (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 110, and generate a bit string to be transmitted.

[0167] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), Discrete Fourier Transform (DFT) processing (as needed), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output the baseband signal.

[0168] The transmitting and receiving unit 120 (RF unit 122) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 130.

[0169] On the other hand, the transmitting and receiving unit 120 (RF unit 122) can also amplify, filter, and demodulate the signals of the wireless frequency band received through the transmitting and receiving antenna 130 into the baseband signal.

[0170] The transmitting and receiving unit 120 (receiving and processing unit 1212) can also perform receiving and processing on the acquired baseband signal, including 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 acquire user data, etc.

[0171] The transmitting / receiving unit 120 (measurement unit 123) can also perform measurements related to the received signal. For example, the measurement unit 123 can also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc., based on the received signal. The measurement unit 123 can also measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 110.

[0172] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between the device included in the core network 30 and other base stations 10, and can also acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0173] In addition, the transmitting unit and receiving unit of the base station 10 in this disclosure may also be composed of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0174] Additionally, the transmit / receive unit 120 can also receive, in a cell (e.g., SpCell), a random access preamble (message 1 or message A) sent from the user terminal 20 in the event of a beam failure being detected.

[0175] The control unit 110 may also be conceived as a period after a specific time (e.g., X symbol) following the successful resolution of contention in the random access procedure (e.g., CBRA) corresponding to the random access preamble, and until the user terminal 20 receives specific information related to the spatial relationship information of the uplink control channel, the user terminal 20 applies the same spatial filter in the uplink control channel (PUCCH) as the last random access preamble transmitted in the cell.

[0176] Here, the specific information related to the spatial relation information of the uplink control channel may be, for example, at least one of the following: an activation command for PUCCH spatial relation information, or a higher-level parameter (PUCCH-SpatialRelationInfo) for PUCCH resources.

[0177] Control unit 110 can also be conceived as follows: after a specific period (e.g., X symbol) following the successful resolution of the contention in the random access procedure (e.g., CBRA) corresponding to the random access preamble, and until the terminal receives specific information related to the transmission configuration indication state (TCI state) of the downlink control channel, the user terminal 20 will use the index (q) of the reference signal corresponding to the random access preamble. new The quasi-co-address parameters of the antenna ports associated with the antenna ports are the same. The quasi-co-address parameters of the antenna ports are used for monitoring of the downlink control channel (PDCCH) in a certain control resource set (CORESET).

[0178] Here, specific information related to the TCI state of the downlink control channel may be, for example, at least one of the higher-level parameters of the list of TCI states used by the PDCCH (tci-StatesPDCCH-ToAddList for appending TCI states to the list, tci-StatesPDCCH-ToReleaseList for deleting TCI states from the list).

[0179] (User terminal)

[0180] Figure 8 This diagram illustrates an example of the structure of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Alternatively, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be included.

[0181] Furthermore, while this example primarily illustrates the functional blocks of the characteristic portions of this embodiment, it is also conceivable that the user terminal 20 may also have other functional blocks required for wireless communication. Some of the processing of each unit described below may also be omitted.

[0182] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the technical field to which this disclosure pertains.

[0183] The control unit 210 can also control signal generation, mapping, etc. The control unit 210 can also control transmission, reception, measurement, etc., using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmission / reception unit 220.

[0184] The transmitting / receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting / receiving unit 220 may be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0185] The transmitting and receiving unit 220 can be configured as a single integrated transmitting and receiving unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit can also be composed of a receiving processing unit 2212, an RF unit 222, and a measurement unit 223.

[0186] The transmitting and receiving antenna 230 can be constructed from an antenna, such as an array antenna, as described based on common knowledge in the art to which this disclosure pertains.

[0187] The transmitting / receiving unit 220 can also receive the downlink channel, synchronization signal, downlink reference signal, etc., mentioned above. The transmitting / receiving unit 220 can also transmit the uplink channel, uplink reference signal, etc., mentioned above.

[0188] The transmitting and receiving unit 220 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0189] The transmitting and receiving unit 220 (transmitting processing unit 2211) may, for example, perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 210, and generate the bit string to be transmitted.

[0190] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may 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 transmitted, and output the baseband signal.

[0191] Furthermore, the application of DFT processing can be based on the transform precoding settings. For a specific channel (e.g., PUSCH), if transform precoding is enabled, the transmit / receive unit 220 (transmit processing unit 2211) can perform DFT processing as described above for transmitting the channel using the DFT-s-OFDM waveform. Otherwise, the transmit / receive unit 220 (transmit processing unit 2211) can perform DFT processing as described above without performing DFT processing.

[0192] The transmitting and receiving unit 220 (RF unit 222) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 230.

[0193] On the other hand, the transmitting and receiving unit 220 (RF unit 222) can also amplify, filter, and demodulate the baseband signal for the wireless frequency band signal received by the transmitting and receiving antenna 230.

[0194] The transmitting and receiving unit 220 (receiving and processing unit 2212) can also perform receiving and processing on the acquired baseband signal, such as 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 acquire user data.

[0195] The transmitting / receiving unit 220 (measurement unit 223) can also perform measurements related to the received signal. For example, the measurement unit 223 can also perform RRM measurements, CSI measurements, etc., based on the received signal. The measurement unit 223 can 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 can also be output to the control unit 210.

[0196] Alternatively, the transmitting and receiving units of the user terminal 20 in this disclosure may also be composed of at least one of a transmitting / receiving unit 220, a transmitting / receiving antenna 230, and a transmission path interface 240.

[0197] In addition, the transmitting and receiving unit 220 can also transmit a random access preamble (message 1 or message A) in a cell (e.g., SpCell) if a beam failure is detected.

[0198] The control unit 210 may also apply the same spatial filter in the uplink control channel (PUCCH) as the random access preamble last transmitted in the cell, after a specific period (e.g., X symbol) following the successful resolution of contention in the random access procedure (e.g., CBRA) corresponding to the random access preamble, and until the reception of specific information related to the spatial relationship information of the uplink control channel.

[0199] Here, the specific information related to the spatial relation information of the uplink control channel may be, for example, at least one of the following: an activation command for PUCCH spatial relation information, or a higher-level parameter (PUCCH-SpatialRelationInfo) for PUCCH resources.

[0200] The control unit 210 may also be conceived as detecting the last symbol received by the initial (message 4 or message B) downlink control channel having a cyclic redundancy check (CRC) scrambled by the cell-radio network temporary identifier (C-RNTI) and a downlink control information format (DCI format) containing an uplink license (UL license) for new transmission, for the timing of the event.

[0201] In the event that a beam failure recovery medium access control element (MAC CE) (BFRMAC CE) is transmitted during the random access process (e.g., included in message 3 or message A), the control unit 210 may also apply the same spatial filter in the uplink control channel as the random access preamble last transmitted in the cell, from the specific period after the timing begins until the specific information is received.

[0202] After a specific period (e.g., X symbol) following the successful resolution of the contention in the random access procedure (e.g., CBRA) corresponding to the random access preamble, and until the terminal receives specific information related to the transmission configuration indication state (TCI state) of the downlink control channel, the control unit 210 may also set the index (q) of the reference signal corresponding to the random access preamble (PRACH). newThe quasi-co-address parameters of the antenna ports associated with the same antenna ports are envisioned for monitoring the downlink control channel (PDCCH) in a certain control resource set (CORESET).

[0203] Here, specific information related to the TCI state of the downlink control channel may be, for example, at least one of the higher-level parameters of the list of TCI states used by the PDCCH (tci-StatesPDCCH-ToAddList for appending TCI states to the list, tci-StatesPDCCH-ToReleaseList for deleting TCI states from the list).

[0204] Control unit 210 may also be conceived as detecting the last symbol received by the initial (message 4 or message B) downlink control channel having a cyclic redundancy check (CRC) scrambled by the cell-radio network temporary identifier (C-RNTI) and containing downlink control information formatting for new uplink permission for transmission.

[0205] In the case of a BFR MAC CE being sent during the random access process, after the specific period from the timing start and until the specific information is received, the control unit 210 may also envision the quasi-co-address parameters of the antenna ports that are the same as the quasi-co-address parameters of the antenna ports associated with the index of the reference signal corresponding to the random access preamble as being used for monitoring the downlink control channel of the certain control resource set.

[0206] In addition, the control resource set can be either a control resource set other than control resource set #0, or it can be control resource set #0.

[0207] (Hardware Structure)

[0208] Furthermore, the block diagrams used in the description of the above embodiments illustrate functional units. These functional blocks (structural units) are implemented through any combination of at least one of hardware and software. Moreover, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented using a single device that is physically or logically combined, or it can be implemented by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices. A functional block can also be implemented by combining the aforementioned single device or multiple devices with software.

[0209] Here, the functions include judgment, decision, determination, calculation, calculation, processing, export, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, regard as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but are not limited to these. For example, a functional block (structural unit) that implements the sending function can also be called a transmitting unit, transmitter, etc. As described above, the implementation method is not particularly limited.

[0210] For example, in one embodiment of this disclosure, the base station, user terminal, etc., can also function as a computer for processing the wireless communication method of this disclosure. Figure 9 This is a diagram illustrating an example of the hardware structure of a base station and a user terminal according to one embodiment. The base station 10 and the user terminal 20 described above can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0211] Furthermore, in this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware structure of base station 10 and user terminal 20 can be configured to include one or more of the apparatuses shown in the figures, or it can be configured not to include any of the apparatuses.

[0212] For example, only one processor 1001 is shown, but there can be multiple processors. Furthermore, processing can be performed by one processor, or simultaneously, sequentially, or by two or more processors using other methods. Additionally, processor 1001 can be implemented using more than one chip.

[0213] The functions of the base station 10 and the user terminal 20 are implemented, for example, by reading specific software (programs) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 can perform calculations and control communication via the communication device 1004, or control at least one of reading out and writing data in the memory 1002 and the storage device 1003.

[0214] The processor 1001, for example, enables the operating system to operate and control the computer as a whole. The processor 1001 may also be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic devices, registers, etc. For example, at least a portion of the control unit 110 (210), the transmit / receive unit 120 (220), etc., described above may also be implemented by the processor 1001.

[0215] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes accordingly. As a program, a program that causes the computer to perform at least a portion of the operations described in the above 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; similar implementations can be made for other functional blocks.

[0216] The memory 1002 may also be a computer-readable recording medium, such as being composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage media. The memory 1002 may also be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 is capable of storing executable programs (program code), software modules, etc., for implementing the wireless communication method according to an embodiment of this disclosure.

[0217] Storage device 1003 may also be a computer-readable recording medium, such as comprising at least one of the following: flexible disc, floppy disk, optical disk (e.g., compact disc ROM, CD-ROM, etc.), digital multifunction disk, Blu-ray disc, removable disk, hard disk, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium. Storage device 1003 may also be referred to as an auxiliary storage device.

[0218] The communication device 1004 is hardware (transmitting and receiving device) used for communication between computers via at least one of a wired network and a wireless network. It is also referred to as a network device, network controller, network interface card (NIC), communication module, etc. To implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the aforementioned transmit / receive unit 120 (220) and transmit / receive antenna 130 (230) may also be implemented by the communication device 1004. The transmit / receive unit 120 (220) may also be implemented by physically or logically separating the transmit unit 120a (220a) and the receive unit 120b (220b).

[0219] Input device 1005 is an input device that receives input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, light-emitting diode (LED) lamp, etc.). Alternatively, input device 1005 and output device 1006 can also be an integrated structure (e.g., touch panel).

[0220] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 can be configured as a single bus or as different buses between the devices.

[0221] Furthermore, the base station 10 and the user terminal 20 can 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), or a field-programmable gate array (FPGA), and can be used to implement some or all of the functional blocks. For example, the processor 1001 can also be implemented using at least one of these hardware components.

[0222] (Modified Example)

[0223] Furthermore, the terms described in this disclosure, as well as those necessary for understanding this disclosure, may be replaced with terms that have the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Additionally, a signal may also be a message. A reference signal may also be abbreviated as RS, and may be referred to as pilot, pilot signal, etc., depending on the applied standard. Furthermore, a component carrier (CC) may also be referred to as cell, frequency carrier, carrier frequency, etc.

[0224] A radio frame can also be composed of one or more periods (frames) in the time domain. Each of these periods (frames) that constitutes a radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) independent of the parameter set (numerology).

[0225] Here, the parameter set can also be communication parameters applied in at least one of the transmission and reception of a signal or channel. For example, the parameter set can also represent at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0226] In the time domain, a time slot can also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.). Furthermore, a time slot can also be a time unit based on a set of parameters.

[0227] A time slot can also contain multiple mini-time slots. Each mini-time slot can also consist of one or more symbols in the time domain. Furthermore, a mini-time slot can also be called a sub-time slot. A mini-time slot can also consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-time slot can also be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using mini-time slots can also be called PDSCH (PUSCH) mapping type B.

[0228] 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 can also use their respective other names. Furthermore, the time units such as frames, subframes, time slots, mini-time slots, and symbols used in this disclosure can be used interchangeably.

[0229] For example, a subframe can also be called a TTI, multiple consecutive subframes can also be called a TTI, a time slot or a mini-time slot can also be called a TTI. That is, at least one of a subframe and a TTI can be a subframe in existing LTE (1ms), a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. In addition, the unit representing TTI may not be called a subframe, but a time slot, mini-time slot, etc.

[0230] Here, TTI refers, for example, to the smallest unit of time for scheduling in wireless communication. For instance, in an LTE system, the base station schedules radio resources (frequency bandwidth, transmit power, etc., available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0231] TTI can also be a unit of time for transmitting channel-coded data packets (transmission blocks), code blocks, codewords, etc., and can also be a unit of processing such as scheduling and link adaptation. In addition, when a TTI is given, the actual time interval (e.g., the number of symbols) mapped to transmission blocks, code blocks, codewords, etc. can be shorter than the TTI.

[0232] Additionally, where a time slot or a mini-time slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini-time slot) can also serve as the minimum time unit for scheduling. Furthermore, the number of time slots (mini-time slots) constituting the minimum time unit of the schedule can also be controlled.

[0233] A TTI with a duration of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), standard TTI, long TTI, normal subframe, standard subframe, long subframe, time slot, etc. A TTI shorter than a normal TTI can also be referred to as a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini time slot, sub-time slot, time slot, etc.

[0234] In addition, long TTIs (e.g., normal TTIs, subframes, etc.) can be replaced with TTIs with a duration of more than 1 ms, and short TTIs (e.g., shortened TTIs, etc.) can be replaced with TTIs with a duration of less than long TTIs but more than 1 ms.

[0235] A resource block (RB) is a unit of resource allocation in both the time and frequency domains. In the frequency domain, it can also contain one or more consecutive subcarriers. The number of subcarriers in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers in an RB can also be determined based on the parameter set.

[0236] Furthermore, an RB can contain one or more symbols in the time domain, and can also be a time slot, a mini-time slot, a subframe, or the length of a TTI. A TTI, a subframe, etc., can also be composed of one or more resource blocks.

[0237] In addition, one or more RBs can also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0238] Furthermore, a resource block can also consist of one or more resource elements (REs). For example, an RE can also be a radio resource area consisting of a subcarrier and a symbol.

[0239] The Bandwidth Part (BWP) (also known as partial bandwidth, etc.) can also represent a subset of consecutive common resource blocks (RBs) used for a certain parameter set in a certain carrier. Here, common RBs can also be determined by the index of RBs based on the common reference point of the carrier. PRBs can also be defined in a BWP and appended with numbers within that BWP.

[0240] A BWP can also include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs can also be set within a single carrier.

[0241] At least one of the configured BWPs can be active, and the UE may not intend to transmit or receive specific signals / channels outside of the active BWPs. Furthermore, terms such as "cell" and "carrier" in this disclosure can be replaced with "BWP".

[0242] Furthermore, the structures described above, such as radio frames, subframes, time slots, mini-time slots, and symbols, are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained within a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, and the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied in many ways.

[0243] Furthermore, the information, parameters, etc., described in this disclosure can be represented by absolute values, relative values ​​with respect to a specific value, or other corresponding information. For example, wireless resources can also be indicated by a specific index.

[0244] In this disclosure, the names used for parameters, etc., are not limiting names in any respect. Furthermore, the mathematical expressions, etc., using these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name; therefore, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0245] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be mentioned throughout the above description, can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0246] Furthermore, information, signals, etc., can be output in at least one of the following directions: from higher level (upper layer) to lower level (lower layer), and from lower layer to higher level. Information, signals, etc., can also be input and output via multiple network nodes.

[0247] Input and output information, signals, etc., can be stored in a specific location (e.g., memory) or managed using management tables. Input and output information, signals, etc., can be overwritten, updated, or appended. Output information, signals, etc., can also be deleted. Input information, signals, etc., can also be sent to other devices.

[0248] The notification of information is not limited to the methods / implementations described in this disclosure, and may also be carried out by other methods. For example, the notification of information in this disclosure may also be implemented by physical layer signaling (e.g., downlink control information (DCI), uplink control information (UCI), etc.), higher 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 combinations thereof.

[0249] In addition, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. Furthermore, RRC signaling can also be referred to as RRC messages, such as RRC connection setup messages, RRC connection reconfiguration messages, etc. Additionally, MAC signaling can also be notified using, for example, the MAC control element (CE).

[0250] Furthermore, notification of specific information (e.g., a notification that “is X”) is not limited to explicit notification, but can also be implicit (e.g., by not providing that specific information, or by providing other information).

[0251] The determination can be made by a value represented by a single bit (0 or 1), by a true or false value (boolean), or by a numerical comparison (e.g., a comparison with a specific value).

[0252] Whether software is called software, firmware, middleware, microcode, hardware description language, or any other name, it should be broadly interpreted to refer to instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0253] Furthermore, software, instructions, and information can 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 technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL) etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0254] The terms “system” and “network” as used in this disclosure are used interchangeably. “Network” may also mean devices included in a network (e.g., base stations).

[0255] In this disclosure, the terms "precoding", "precoder", "weight (precoding weight)", "quasi-co-location (QCL)", "transmission configuration indication state (TCI state)", "spatial relation", "spatial domain filter", "transmit power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beamwidth", "beam angle", "antenna", "antenna element", and "panel" are used interchangeably.

[0256] In this disclosure, the terms "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" are used interchangeably. There are also instances where the terms macro cell, small cell, femtocell, and picocell are used to refer to a base station.

[0257] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base station and base station subsystem providing communication services within that coverage area.

[0258] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "user equipment (UE)", and "terminal" are used interchangeably.

[0259] There are also instances where mobile stations are referred to as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, handsets, user agents, mobile clients, clients, or several other appropriate terms.

[0260] At least one of the base station and the mobile station can also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Additionally, at least one of the base station and the mobile station can also be a device mounted on a mobile body, the mobile body itself, etc. This mobile body can be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body moving in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanized or unmanned). Furthermore, at least one of the base station and the mobile station also includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station can also be an Internet of Things (IoT) device such as a sensor.

[0261] Furthermore, the base station in this disclosure can also be replaced by a user terminal. For example, various methods / implementations of this disclosure can be applied to a structure where the communication between the base station and the user terminal is replaced by communication between multiple user terminals (e.g., also referred to as device-to-device (D2D) or vehicle-to-everything (V2X)). In this case, it can also be configured such that the user terminal 20 has the functions of the base station 10 described above. In addition, terms such as "uplink" and "downlink" can be replaced with terms corresponding to inter-terminal communication (e.g., "side"). For example, uplink channel, downlink channel, etc., can also be replaced with side channel.

[0262] Similarly, the user terminal in this disclosure can also be replaced by a base station. In this case, it can also be configured such that the base station 10 has the functions of the user terminal 20 described above.

[0263] In this disclosure, actions purported to be performed by the base station are sometimes also performed by its upper node, depending on the circumstances. Clearly, in a network containing one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (e.g., considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or combinations thereof.

[0264] The various methods / implementations described in this disclosure can be used individually or in combination, and can be switched as needed during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of the various methods / implementations described in this disclosure can be rearranged as long as they do not contradict each other. For example, with respect to the methods described in this disclosure, the illustrated order is used to indicate various steps, but the order in which they are indicated is not limited.

[0265] The various methods / implementations described in this disclosure can 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 This includes 802.11 (Wi-Fi, a registered trademark), IEEE 802.16 (WiMAX, a registered trademark), IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (a registered trademark), systems utilizing other suitable wireless communication methods, and next-generation systems derived from them. Furthermore, multiple systems can be combined (e.g., LTE or LTE-A, combinations with 5G, etc.) for application.

[0266] As used in this disclosure, the term "based on" does not mean "based on only" unless otherwise specified. In other words, the term "based on" means both "based on only" and "based on at least".

[0267] Any reference to an element using the designations "first," "second," etc., as used in this disclosure does not comprehensively limit the quantity or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, reference to the first and second elements does not imply that only two elements may be used, or that the first element must in some form take precedence over the second element.

[0268] The term "determining" as used in this disclosure can encompass a wide variety of actions. For example, "determining" can also refer to judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), and ascertaining.

[0269] In addition, "judgment (decision)" can also refer to receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, accessing (e.g., accessing data in memory), etc., as situations where "judgment (decision)" is performed.

[0270] Furthermore, "judgment (decision)" can also refer to situations where resolving, selecting, choosing, establishing, or comparing are considered as making a "judgment (decision)". In other words, "judgment (decision)" can also refer to certain actions as situations where a "judgment (decision)" is made.

[0271] In addition, "judgment (decision)" can also be replaced by "assuming", "expecting", "considering", etc.

[0272] The term "maximum transmit power" as used in this 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).

[0273] As used in this disclosure, the terms "connected," "coupled," or any variations thereof, refer to all direct or indirect connections or combinations between two or more elements, and can include cases where there is one or more intermediate elements between two mutually "connected" or "coupled" elements. The connections or combinations between elements can be physical, logical, or a combination thereof. For example, "connected" can also be replaced with "access."

[0274] In this disclosure, when two elements are connected, it is possible to use more than one wire, cable, printed electrical connection, etc., and to use electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region as several non-limiting and non-inclusive examples, so that they are "connected" or "combined" with each other.

[0275] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other." Additionally, the term can also mean "A and B are each different from C." Terms such as "separate" and "combined" can also be interpreted in the same way as "different."

[0276] When the terms "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," mean inclusive. Furthermore, the term "or" as used in this disclosure does not mean XOR.

[0277] In this disclosure, for example, in cases where articles are added through translation, such as a, an, and the in English, the disclosure may also include cases where the noun following these articles is in a plural form.

[0278] The invention disclosed herein has been described in detail above. However, it will be apparent to those skilled in the art that the invention is not limited to the embodiments described herein. The invention can be implemented with modifications and variations without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description in this disclosure is for illustrative purposes only and is not intended to limit the invention in any way.

Claims

1. A terminal, comprising: The transmitting unit transmits the random access preamble in the beam failure recovery (BFR) procedure based on the contention-type random access (CBRA) process; and The receiving unit, after transmitting capability information related to the BFR based on the CBRA procedure in a special cell, and before receiving the activation of the transmission setting indication TCI state, receives the downlink control channel PDCCH using quasi-co-address QCL parameters associated with the random access preamble, after receiving the last symbol of the downlink control channel PDCCH representing the success of the CBRA, starting with a specific symbol.

2. A wireless communication method for a terminal, comprising: The steps for transmitting the random access preamble in beam failure recovery (BFR) based on a contention-based random access (CBRA) procedure; and In the case of transmitting capability information related to the BFR based on the CBRA procedure in a special cell, and before receiving the activation of the transmission setting indication TCI state, the step of receiving the downlink control channel PDCCH using the quasi-co-address QCL parameters associated with the random access preamble after the last symbol of the downlink control channel PDCCH receiving the downlink message indicating the success of the CBRA, starting with a specific symbol.

3. A base station, comprising: The receiving unit receives the random access preamble in the beam failure recovery (BFR) procedure based on the contention-type random access (CBRA) process; and The transmitting unit, upon receiving capability information related to the BFR based on the CBRA procedure in a special cell and before the activation of the transmission setting indication TCI state, transmits the downlink control channel PDCCH using quasi-co-address QCL parameters associated with the random access preamble after a specific symbol following the last symbol of the downlink control channel PDCCH transmission indicating the success of the CBRA.

4. A system having a terminal and a base station, The terminal has: The transmitting unit transmits the random access preamble in the beam failure recovery (BFR) procedure based on the contention-type random access (CBRA) process; and The receiving unit, after transmitting capability information related to the BFR based on the CBRA procedure in a special cell, and before receiving the activation of the transmission setting indication TCI state, receives the downlink control channel PDCCH using quasi-co-address QCL parameters associated with the random access preamble, starting from a specific symbol after the last symbol of the downlink control channel PDCCH receiving the downlink message indicating the success of the CBRA. The base station has: The transmitting unit transmits the PDCCH using the QCL parameters associated with the random access preamble.

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