Terminal, wireless communication method, base station and system

Abstract

A terminal according to one embodiment of the present disclosure has: a reception unit for receiving information relating to a plurality of reference signal sets for beam obstacle detection, and information relating to a plurality of reference signal sets for candidate beams; and a control unit for performing control such that, after a response signal for beam obstacle recovery is received when two transmission configuration indication (TCI) state instructions are supported by a TCI field for downlink control information, an expectation for an antenna port pseudo-collocation parameter is updated with respect to a control resource set associated with at least reference signal sets for which a beam obstacle was detected.

Description

Terminal, wireless communication method and base station

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

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

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

[0004] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

[0005] Rel. 16 supports communications using multiple TRPs in a serving cell. In this case, DL transmissions (e.g., PDSCHs) transmitted from each TRP can be scheduled using a single DCI or multiple DCIs. In single-DCI-based multi-TRP, the scheduling of PDSCHs transmitted from multiple TRPs is controlled using a DCI transmitted from one TRP.

[0006] Furthermore, in future wireless communication systems, it is being considered that terminals will perform beam failure detection (BFD) / beam failure recovery (BFR). Furthermore, in Rel. 17 NR and later, in addition to cell-based BFD / BFR, it is also considered that BFD / BFR based on other units (e.g., TRP-based / panel-based) will be supported.

[0007] However, in the case of a single DCI-based multi-TRP, when BFD / BFR is supported on a TRP-by-TRP basis, how to perform beam updating associated with BFD / BFR has not been fully considered. If the beam updating associated with BFD / BFR is not properly controlled, there is a risk of degradation in communication quality.

[0008] Therefore, one of the objectives of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately control beam updates associated with BFD / BFR even when BFD / BFR other than on a cell-by-cell basis is supported.

[0009] A terminal according to one aspect of the present disclosure has a receiving unit that receives information regarding multiple reference signal sets for beam failure detection and information regarding multiple reference signal sets for candidate beams, and a control unit that, when the transmission configuration indicator (TCI) field of the downlink control information supports indication of two TCI states, controls, after receiving a response signal for beam failure recovery, to update the assumption of antenna port pseudo-colocation parameters for at least the control resource set associated with the reference signal set in which the beam failure was detected.

[0010] According to one aspect of the present disclosure, even when BFD / BFR other than on a cell-by-cell basis is supported, beam updating associated with BFD / BFR can be appropriately controlled.

[0011] 1A to 1D are diagrams illustrating an example of a multi-TRP scenario. FIG. 2 is a diagram illustrating an example of a beam recovery procedure. FIGS. 3A and 3B are diagrams illustrating an example of association between a CORESET (or an active TCI state of a CORESET) and a BFD-RS set / NBI-RS set in a single-DCI-based multi-TRP according to the first embodiment. FIGS. 4A and 4B are diagrams illustrating an example of association between a CORESET (or an active TCI state of a CORESET) and a BFD-RS set / NBI-RS set in a multi-DCI-based multi-TRP according to the first embodiment. FIG. 5 is a diagram illustrating an example of beam update control of a CORESET / PDCCH after completion of BFR (after reception of a BFR response) according to the first embodiment. FIG. 6 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 7 is a diagram illustrating an example of a configuration of a base station according to an embodiment. FIG. 8 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. Fig. 9 is a diagram illustrating an example of a hardware configuration of a base station and a user terminal according to an embodiment. Fig. 10 is a diagram illustrating an example of a vehicle according to an embodiment.

[0012] (TCI, spatial relationship, QCL) In NR, it is considered to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) in a UE of at least one of a signal and a channel (referred to as a signal / channel) based on a transmission configuration indication state (TCI state).

[0013] The TCI state may represent that which is applied to a downlink signal / channel, and the equivalent of the TCI state that is applied to an uplink signal / channel may be expressed as a spatial relation.

[0014] The TCI state is information about the Quasi-Co-Location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relation information, etc. The TCI state may be configured in the UE for each channel or signal.

[0015] The QCL is an index indicating the statistical properties of signals / channels. For example, if a signal / channel has a QCL relationship with another signal / channel, it may mean that it can be assumed that at least one of a Doppler shift, a Doppler spread, an average delay, a delay spread, and a spatial parameter (e.g., a spatial Rx parameter) is the same between these different signals / channels (i.e., the signals / channels have a QCL with respect to at least one of these).

[0016] The spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be identified based on a spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may be replaced with sQCL (spatial QCL).

[0017] A plurality of types (QCL types) of QCL may be defined. For example, four QCL types A to D may be provided, each having different parameters (or parameter sets) that can be assumed to be the same. The parameters (which may be referred to as QCL parameters) are as follows: QCL type A (QCL-A): Doppler shift, Doppler spread, mean delay, and delay spread QCL type B (QCL-B): Doppler shift and Doppler spread QCL type C (QCL-C): Doppler shift and mean delay QCL type D (QCL-D): Spatial reception parameters.

[0018] The UE's assumption that a Control Resource Set (CORESET), channel, or reference signal has a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be referred to as a QCL assumption.

[0019] The UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal / channel based on the TCI condition or QCL assumption of the signal / channel.

[0020] The TCI state may be, for example, information about the QCL between the channel of interest (in other words, the Reference Signal (RS) for that channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0021] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0022] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0023] Furthermore, the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).

[0024] An SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may also be referred to as an SS / PBCH block.

[0025] An RS of QCL type X in a TCI state may refer to an RS that has a QCL type X relationship with a certain channel / signal (DMRS), and this RS may be called a QCL source of QCL type X in the TCI state.

[0026] For the PDCCH and PDSCH, the QCL Type A RS is always configured, and the QCL Type D RS may be configured additionally. Since it is difficult to estimate Doppler shift, delay, etc. by one-shot reception of the DMRS, the QCL Type A RS is used to improve the accuracy of channel estimation. The QCL Type D RS is used to determine the receiving beam when receiving the DMRS.

[0027] For example, TRS1-1, 1-2, 1-3, and 1-4 are transmitted, and TRS1-1 is notified as a QCL type C / D RS depending on the TCI status of the PDSCH. By notifying the TCI status, the UE can use information obtained from past periodic reception / measurement results of TRS1-1 for reception / channel estimation of the DMRS for the PDSCH. In this case, the QCL source of the PDSCH is TRS1-1, and the QCL target is the DMRS for the PDSCH.

[0028] (Multi-TRP) In NR, one or more transmission / reception points (Transmission / Reception Points (TRP)) (multi-TRP) are considered to perform DL transmission to a UE using one or more panels (multi-panels). Also, it is considered that a UE performs UL transmission to one or more TRPs.

[0029] Note that multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0030] 1A-1D illustrate an example of a multi-TRP scenario, assuming, but not limited to, that each TRP is capable of transmitting four different beams.

[0031] 1A shows an example of a case where only one TRP (TRP1 in this example) of multiple TRPs transmits to the UE (this may be referred to as single mode, single TRP, etc.). In this case, TRP1 transmits both control signals (PDCCH) and data signals (PDSCH) to the UE.

[0032] 1B shows an example of a case where only one TRP (TRP1 in this example) transmits control signals to the UE, and the multi-TRP transmits data signals (also called single master mode). The UE receives each PDSCH transmitted from the multi-TRP based on a single Downlink Control Information (DCI).

[0033] Figure 1C shows an example of a case where each of the multi-TRPs transmits a part of the control signal to the UE, and the multi-TRPs transmit data signals (this may be called a master-slave mode). Part 1 of the control signal (DCI) may be transmitted in TRP1, and Part 2 of the control signal (DCI) may be transmitted in TRP2. Part 2 of the control signal may depend on Part 1. The UE receives each PDSCH transmitted from the multi-TRP based on these parts of the DCI.

[0034] 1D shows an example of a multi-TRP mode in which each TRP transmits a separate control signal to the UE, and the multi-TRP transmits a data signal (also referred to as a multi-master mode). A first control signal (DCI) may be transmitted on TRP1, and a second control signal (DCI) may be transmitted on TRP2. The UE receives each PDSCH transmitted from the multi-TRP based on these DCIs.

[0035] When multiple PDSCHs from multiple TRPs as shown in Figure 1B (which may also be referred to as multiple PDSCHs) are scheduled using one DCI, the DCI may be referred to as a single DCI (S-DCI, single PDCCH). Also, when multiple PDSCHs from multiple TRPs as shown in Figure 1D are scheduled using multiple DCIs, these multiple DCIs may be referred to as multiple DCIs (M-DCI, multiple PDCCHs).

[0036] Each TRP in a multi-TRP may transmit a different transport block (TB) / code word (CW) / different layer, or each TRP in a multi-TRP may transmit the same TB / CW / layer.

[0037] Non-Coherent Joint Transmission (NCJT) is being considered as one form of multi-TRP transmission. In NCJT, for example, TRP1 modulates and layer-maps a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding. TRP2 modulates and layer-maps a second codeword to transmit a second PDSCH using a second number of layers (e.g., two layers) with a second precoding.

[0038] Note that multiple PDSCHs (multi-PDSCHs) that are non-coherent may be defined as partially or completely overlapping in time and / or frequency domains, i.e., a first PDSCH from a first TRP and a second PDSCH from a second TRP may overlap in time and / or frequency resources.

[0039] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (QCL). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0040] In URLLC for multi-TRP, it is considered that PDSCH (transport block (TB) or codeword (CW)) repetition across multi-TRP is supported. Repetition schemes (URLLC schemes, e.g., Schemes 1, 2a, 2b, 3, and 4) across multi-TRP in the frequency domain, layer (spatial) domain, or time domain are supported. In Scheme 1, multiple PDSCHs from multi-TRP are space division multiplexed (SDM). In Schemes 2a and 2b, PDSCHs from multi-TRP are frequency division multiplexed (FDM). In Scheme 2a, the redundancy version (RV) is the same for multi-TRP. In Scheme 2b, the RVs for multi-TRP may be the same or different. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexed (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are transmitted in one slot. In scheme 4, multiple PDSCHs from multiple TRPs are transmitted in different slots.

[0041] Such a multi-TRP scenario allows for more flexible transmission control using good quality channels.

[0042] In order to support multi-TRP transmission within a cell (with the same cell ID) and between cells (with different cell IDs) based on multiple PDCCHs, in the RRC configuration information for linking multiple pairs of PDCCHs and PDSCHs with multiple TRPs, one control resource set (CORESET) in the PDCCH configuration information (PDCCH-Config) may correspond to one TRP.

[0043] If at least one of the following conditions 1 and 2 is satisfied, the UE may determine that the transmission is a multi-TRP transmission based on the multi-DCI. In this case, the TRP may be replaced with the CORESET pool index. [Condition 1] A CORESET pool index of 1 is set. [Condition 2] Two different values ​​of the CORESET pool index (e.g., 0 and 1) are set.

[0044] If the following condition is met, the UE may determine that it is a multi-TRP based on a single DCI. In this case, two TRPs may be interpreted as two TCI states indicated by the MAC CE / DCI. [Condition] "Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE" is used to indicate one or two TCI states for one codepoint in the TCI field in the DCI.

[0045] The DCI for common beam instruction may be a UE-specific DCI format (e.g., DL DCI format (e.g., 1_1, 1_2), UL DCI format (e.g., 0_1, 0_2)), or may be a UE-group common DCI format.

[0046] (Beam Failure Detection (BFD) / Beam Failure Recovery (BFR)) In NR, communication is performed using beamforming. For example, a UE and a base station (e.g., a gNB (gNodeB)) may use a beam used to transmit a signal (also referred to as a transmit beam, Tx beam, etc.) and a beam used to receive a signal (also referred to as a receive beam, Rx beam, etc.).

[0047] When beamforming is used, it is expected that radio link quality will deteriorate due to increased susceptibility to interference from obstacles. This deterioration in radio link quality may lead to frequent radio link failures (RLFs). Since RLFs require cell reconnection, frequent RLFs will result in degradation of system throughput.

[0048] In NR, in order to suppress the occurrence of RLF, when the quality of a specific beam deteriorates, a procedure for switching to another beam (which may be called Beam Recovery (BR), Beam Failure Recovery (BFR), L1 / L2 (Layer 1 / Layer 2) beam recovery, etc.) is performed. Note that the BFR procedure may also be simply called BFR.

[0049] Note that the beam failure (BF) in this disclosure may also be referred to as a link failure.

[0050] 2 is a diagram showing an example of a beam recovery procedure in Rel. 15 NR. The number of beams is merely an example and is not limited to this. In the initial state (step S101), the UE performs measurements based on reference signal (RS) resources transmitted using two beams.

[0051] The RS may be at least one of a synchronization signal block (SSB) and a channel state measurement RS (Channel State Information RS (CSI-RS)). The SSB may also be called an SS / PBCH (Physical Broadcast Channel) block.

[0052] The RS may be at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Mobility Reference Signal (MRS), a signal included in an SSB, an SSB, a CSI-RS, a Demodulation Reference Signal (DMRS), a beam-specific signal, etc., or a signal configured by extending or modifying any of these. The RS measured in step S101 may also be called an RS for beam failure detection (Beam Failure Detection RS (BFD-RS)), an RS for use in a beam recovery procedure (BFR-RS), etc.

[0053] In step S102, the UE cannot detect the BFD-RS (or the reception quality of the RS deteriorates) due to interference with the radio waves from the base station. Such interference can occur due to, for example, obstacles, fading, interference, etc. between the UE and the base station.

[0054] The UE detects a beam failure when a predetermined condition is satisfied. For example, the UE may detect the occurrence of a beam failure when the block error rate (BLER) is less than a threshold for all configured BFD-RSs (BFD-RS resource configurations). When the occurrence of a beam failure is detected, a lower layer (physical (PHY) layer) of the UE may notify (indicate) a beam failure instance to an upper layer (MAC layer).

[0055] The criteria for the determination are not limited to BLER, but may be Layer 1 Reference Signal Received Power (L1-RSRP) in the physical layer. Also, instead of or in addition to RS measurement, beam failure detection may be performed based on a downlink control channel (Physical Downlink Control Channel (PDCCH)). The BFD-RS may be expected to be quasi-co-located (QCL) with the DMRS of the PDCCH monitored by the UE.

[0056] Here, the QCL is an index indicating the statistical properties of a channel. For example, if a signal / channel has a QCL relationship with another signal / channel, it may mean that it can be assumed that at least one of a Doppler shift, a Doppler spread, an average delay, a delay spread, and a spatial parameter (e.g., a spatial Rx parameter) is the same between these different signals / channels (i.e., the QCL is true for at least one of these).

[0057] The spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be identified based on a spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may be replaced with sQCL (spatial QCL).

[0058] Information about BFD-RS (e.g., RS index, resource, number, number of ports, precoding, etc.), information about beam failure detection (BFD) (e.g., the above-mentioned threshold), etc. may be configured (notified) to the UE using higher layer signaling, etc. The information about BFD-RS may also be referred to as information about BFR resources, etc.

[0059] When a beam failure instance notification is received from the UE's PHY layer, the UE's upper layer (e.g., MAC layer) may start a predetermined timer (which may be called a beam failure detection timer). If the UE's MAC layer receives a certain number of beam failure instance notifications (e.g., beamFailureInstanceMaxCount configured in RRC) before the timer expires, the UE's MAC layer may trigger a BFR (e.g., start one of the random access procedures described below).

[0060] The base station may determine that the UE has detected a beam failure if there is no notification from the UE or if a predetermined signal (beam recovery request in step S104) is received from the UE.

[0061] In step S103, the UE starts searching for a new candidate beam to be used for new communication in order to recover the beam. The UE may select a new candidate beam corresponding to a predetermined RS by measuring the RS. The RS measured in step S103 may be called a new candidate RS, an RS for identifying a new candidate beam, an NCBI-RS (New Candidate Beam Identification RS), an RS for new beam identification, an RS for new beam identification, an NBI-RS (New Beam Identification RS), a CBI-RS (Candidate Beam Identification RS), a CB-RS (Candidate Beam RS), or the like. The NBI-RS may be the same as or different from the BFD-RS. The new candidate beam may also be simply called a candidate beam or candidate RS.

[0062] The UE may determine a beam corresponding to an RS that satisfies a predetermined condition as a new candidate beam. The UE may determine a new candidate beam, for example, based on an RS among the configured NBI-RSs whose L1-RSRP exceeds a threshold. Note that the criteria for determination are not limited to L1-RSRP. The L1-RSRP related to SSB may be referred to as SS-RSRP. The L1-RSRP related to CSI-RS may be referred to as CSI-RSRP.

[0063] Information about the NBI-RS (e.g., RS resources, number, number of ports, precoding, etc.), information about the new beam identification (NBI) (e.g., the above-mentioned threshold), etc. may be configured (notified) to the UE using higher layer signaling, etc. Information about the new candidate RS (or NBI-RS) may be acquired based on information about the BFD-RS. Information about the NBI-RS may be referred to as information about NBI resources, etc.

[0064] Note that BFD-RS, NBI-RS, etc. may be interchangeably read as Radio Link Monitoring RS (RLM-RS).

[0065] In step S104, the UE that has identified the new candidate beam transmits a beam failure recovery request (BFRQ). The beam recovery request may also be referred to as a beam recovery request signal, a beam failure recovery request signal, or the like.

[0066] The BFRQ may be transmitted using, for example, at least one of an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and a configured grant (CG) PUSCH.

[0067] The BFRQ may include information of the new candidate beam / new candidate RS identified in step S103. Resources for the BFRQ may be associated with the new candidate beam. The beam information may be notified using a beam index (BI), a port index of a predetermined reference signal, an RS index, a resource index (e.g., a CSI-RS Resource Indicator (CRI) or an SSB Resource Indicator (SSBRI)), etc.

[0068] In Rel. 15 NR, CB-BFR (Contention-Based BFR), which is a BFR based on a contention-based random access (RA) procedure, and CF-BFR (Contention-Free BFR), which is a BFR based on a contention-free random access procedure, are being considered. In CB-BFR and CF-BFR, the UE may use the PRACH resource to transmit a preamble (also referred to as an RA preamble, a random access channel (Physical Random Access Channel (PRACH)), a RACH preamble, etc.) as a BFRQ.

[0069] In CB-BFR, a UE may transmit a preamble randomly selected from one or more preambles. On the other hand, in CF-BFR, a UE may transmit a preamble assigned specifically to the UE by the base station. In CB-BFR, a base station may assign the same preamble to multiple UEs. In CF-BFR, a base station may assign a preamble individually to each UE.

[0070] Note that CB-BFR and CF-BFR may be referred to as CB PRACH-based BFR (contention-based PRACH-based BFR (CBRA-BFR)) and CF PRACH-based BFR (contention-free PRACH-based BFR (CFRA-BFR)), respectively. CBRA-BFR may be referred to as CBRA for BFR. CFRA-BFR may be referred to as CFRA for BFR.

[0071] Regardless of whether CB-BFR or CF-BFR is used, information about the PRACH resource (RA preamble) may be notified, for example, by higher layer signaling (such as RRC signaling). For example, the information may include information indicating a correspondence relationship between the detected DL-RS (beam) and the PRACH resource, and a different PRACH resource may be associated with each DL-RS.

[0072] In step S105, the base station that detected the BFRQ transmits a response signal (which may be referred to as a gNB response, etc.) to the BFRQ from the UE. The response signal may include reconfiguration information (e.g., DL-RS resource configuration information) for one or more beams.

[0073] The response signal may be transmitted, for example, in a UE common search space of the PDCCH. The response signal may be signaled using a PDCCH (DCI) scrambled with a cyclic redundancy check (CRC) by a UE identifier (e.g., a Cell-Radio RNTI (C-RNTI)). The UE may determine at least one of a transmit beam and a receive beam to use based on the beam reconfiguration information.

[0074] The UE may monitor the response signal based on at least one of a control resource set (CORESET) for BFR and a search space set for BFR.

[0075] For CB-BFR, contention resolution may be determined to be successful if the UE receives a PDCCH corresponding to its own C-RNTI.

[0076] Regarding the processing of step S105, a period for the UE to monitor a response from a base station (e.g., a gNB) to the BFRQ may be set. This period may be referred to as, for example, a gNB response window, a gNB window, a beam recovery request response window, etc. If no gNB response is detected within this window period, the UE may retransmit the BFRQ.

[0077] In step S106, the UE may transmit a message indicating that the beam reconfiguration is complete to the base station. The message may be transmitted, for example, via the PUCCH or the PUSCH.

[0078] A beam recovery success (BR success) may indicate, for example, that step S106 has been reached, whereas a beam recovery failure (BR failure) may indicate, for example, that a predetermined number of BFRQ transmissions have been made or that a beam-failure-recovery-timer has expired.

[0079] Rel. 15 supports the use of a random access procedure to perform a beam recovery procedure (e.g., BFRQ notification) for a beam failure detected in an SpCell (PCell / PSCell). On the other hand, Rel. 16 supports the use of at least one of a PUCCH (e.g., a scheduling request (SR)) transmission for BFR and a MAC CE (e.g., an UL-SCH) transmission for BFR to perform a beam recovery procedure (e.g., BFRQ notification) for a beam failure detected in an SCell.

[0080] For example, the UE may transmit information about beam failure using a MAC CE-based two-step method, which may include information about the cell that detected the beam failure and information about a new candidate beam (or a new candidate RS index).

[0081] [Step 1] If a BFR is detected, a PUCCH-BFR (scheduling request (SR)) may be transmitted from the UE to the PCell / PSCell. Then, an UL grant (DCI) for the following step 2 may be transmitted from the PCell / PSCell to the UE. If a beam failure is detected and a MAC CE (or an UL-SCH) for transmitting information about a new candidate beam exists, step 1 (e.g., PUCCH transmission) may be omitted and step 2 (e.g., MAC CE transmission) may be performed.

[0082] [Step 2] Next, the UE may transmit information about the cell where beam failure was detected (failed) (e.g., cell index) and information about the new candidate beam to the base station (PCell / PSCell) via an uplink channel (e.g., PUSCH) using a MAC CE. After that, through the BFR procedure, the QCL of the PDCCH / PUCCH / PDSCH / PUSCH may be updated to the new beam after a predetermined period (e.g., 28 symbols) after receiving a response signal from the base station.

[0083] Note that the numbers of these steps are for illustrative purposes only, and multiple steps may be combined or the order may be reversed. Furthermore, whether to perform BFR may be configured in the UE using higher layer signaling.

[0084] (BFD-RS) In Rel. 16, for each BWP of one serving cell, the UE can be provided with a set of periodic (P)-CSI-RS resource configuration indices (q0) via higher layer parameters related to failure detection resources (e.g., failureDetectionResources, failureDetectionResourcesToAddModList, RadioLinkMonitoringConfig). The UE can also be provided with at least one set of P-CSI-RS resource configuration indices and SS / PBCH block indices (q1) via a candidate beam RS list (candidateBeamRSList), an extended candidate beam RS list (candidateBeamRSListExt-r16), or a candidate beam RS list for SCell (candidateBeamRSSCellList-r16).

[0085] Here, q0 bar is written as "q0" with an overline. Hereinafter, q0 bar will be written simply as q0. q1 bar is written as "q1" with an overline. Hereinafter, q1 bar will be written simply as q1.

[0086] The set of P-CSI-RS resources q0 provided by the failure detection resources (eg, predetermined higher layer parameters) may be referred to as explicit BFD-RS.

[0087] The UE may perform L1-RSRP measurements, etc. using RS resources corresponding to indices included in at least one of set q0 and set q1, to detect beam failure.

[0088] In the present disclosure, providing the above-described higher layer parameters indicating information on indexes corresponding to BFD resources may be interchangeable with configuring BFD resources, configuring a BFD-RS, etc. In the present disclosure, the BFD resources, the periodic CSI-RS resource configuration index or the set of SSB indices q0, the BFD-RS, the BFD-RS set, and the RS set may be interchangeable.

[0089] If a UE is not provided with a BFD-RS set q0 by failure detection resources (e.g., failureDetectionResourcesToAddModList) for one BWP of its serving cell, the UE may be supported to determine the RS (set q0) to use for the BFD procedure according to the following implicit BFD-RS determination procedure.

[0090] [Implicit BFD-RS Decision Procedure] The UE decides to include in set q0 the P-CSI-RS resource configuration index that has the same value as the RS index in the RS set indicated by the TCI-State for each CORESET that the UE uses to monitor the PDCCH. This set q0 may be called implicit BFD-RS.

[0091] If there are two RS indices in one TCI state, set q0 contains RS indices with QCL type D configuration for the corresponding TCI state. The UE assumes that set q0 contains up to two RS indices. The UE assumes single-port RSs in set q0.

[0092] In this way, if the RS (e.g., BFD-RS) set for beam failure detection is not explicitly provided (e.g., by a higher layer parameter), the UE may determine the BFD-RS (RS set) based on the TCI state corresponding to the PDCCH / CORESET.

[0093] (TRP-based BFR) Prior to Rel. 16, cell-based BFR was supported, but from Rel. 17 onwards, it is expected that BFR will be supported on a non-cell basis (e.g., on a per-TRP basis, one or more TRPs included in a cell). For example, from Rel. 17 onwards, the introduction of independent BFD-RS settings for each TRP is being considered for beam obstruction detection with multiple TRPs. Each TRP may be associated with one or more BFD-RSs.

[0094] In the present disclosure, one or more BFD-RSs may be referred to as a set of BFD-RSs (BFD-RS set). In Rel. 15, up to two BFD-RSs are configured per BWP. For example, the two BFD-RSs may be referred to as one BFD-RS set. In Rel. 17 and later, the number of BFD-RSs per BWP is not limited to two, and may be determined based on UE capabilities, for example.

[0095] Also, in Rel. 17 and later, in BFR with multiple TRPs, multiple (e.g., two) BFD-RS sets are supported per BWP, and up to N RSs (N is any integer) may be supported per BFD-RS set.

[0096] Furthermore, in Rel. 17 and later, when one or more NBI-RSs (NBI-RS sets) are configured for each TRP in new beam identification with multiple TRPs, it is considered to support the configuration of an independent NBI-RS set for each TRP. In this disclosure, one or more NBI-RSs may be referred to as a set of NBI-RSs (NBI-RS set).

[0097] Furthermore, in Rel. 17 and later, it is being considered to associate one BFD-RS set with one NBI-RS set in a one-to-one relationship.

[0098] For example, for BFR of multiple TRPs based on single / multiple DCI, it may be supported that up to two BFD-RS sets and two BFD-RS sets are configured per TRP.

[0099] Furthermore, if TRP-based (or panel-based) BFR is supported in addition to the cell-based BFR of Rel. 16 and earlier, it is assumed that BFR in a certain cell will be performed using either unit. In this case, the UE may be implicitly instructed as to whether to apply cell-based BFR or TRP-based BFR.

[0100] For example, in each BWP of the serving cell, if a UE is provided with an RS set for first beam failure detection (BFD-RS set) / RS set for candidate beam (NBI-RS set), BFR per cell is applied. On the other hand, in each BWP of the serving cell, if a UE is provided with an RS set for second beam failure detection (BFD-RS set) / RS set for candidate beam (NBI-RS set) instead of the RS set for first beam failure detection (BFD-RS set q0) / RS set for candidate beam (NBI-RS set q1), BFR per TRP may be applied.

[0101] For example, the second beam failure detection RS set (BFD-RS set) may be two BFD-RS sets (e.g., two sets q of (P)-CSI-RS resource configuration indexes). 0,0 bar (hereinafter, q 0,0 (also written as q) 0,1 bar (hereinafter, q 0,1 Also, the RS set for the second candidate beam (NBI-RS set) may include two NBI-RS sets (e.g., at least two sets q of P-CSI-RS resource configuration indexes and SS / PBCH block indexes). 1,0 bar (hereinafter, q 1,0 (also written as q) 1,1 bar (hereinafter, q 1,1 It may also include

[0102] BFD-RS Set 0,0is NBI-RS set q 1,0 and the BFD-RS set q 0,1 is NBI-RS set q 1,1 Also, the NBI-RS set q 1,0 and, q 1,1 and may be set by separate upper layer parameters (e.g., candidateBeamRSList1 and candidateBeamRSList2).

[0103] In this way, when a first BFD-RS set q0 / NBI-RS set q1 is provided in a certain cell (or a BWP of a certain cell), the UE performs BFR (e.g., cell-based BFR) using the RS set. On the other hand, when a second BFD-RS set q0 / NBI-RS set q1 is provided instead of the first BFD-RS set q0 / NBI-RS set q1, the UE performs BFR (e.g., cell-based BFR). 0,0 , q 0,1 / NBI-RS set q 1,0 , q 1,1 When provided, the RS set is used to perform BFR (for example, BFR in TRP units).

[0104] Note that multiple BFD-RS sets and multiple NBI-RS sets may be associated with different TRPs. 0,0 and NBI-RS set q 1,0 is associated with the first TRP (e.g., TRP #1), and the BFD-RS set q 0,0 and NBI-RS set q 1,0 may be associated with a second TRP (e.g., TRP#2).

[0105] As mentioned above, in Rel. 17 and later, it is assumed that BFR per TRP will be applied to both single-DCI-based multi-TRP and multi-DCI-based multi-TRP. For example, in single-DCI-based multi-TRP, the schedules of PDSCHs transmitted from multiple TRPs are controlled using DCI (PDCCH / CORESET) transmitted from one TRP.

[0106] When per-TRP BFR is applied, the UE updates the beam (e.g., DL beam) for each TRP in which beam failure is detected after BFR completion (or after receiving a BFR response). For example, the UE assumes the antenna port quasi-co-location parameters corresponding to the RS index (e.g., qnew from the NBI-RS set) reported as the candidate beam for the DL transmission of the TRP in which beam failure is detected.

[0107] However, when a single DCI-based multi-TRP is applied, since PDCCH / CORESET is transmitted only from a specific TRP, how to control the beam update of PDCCH / CORESET after BFR completion becomes an issue. If the beam update after BFR completion cannot be performed appropriately, there is a risk of degradation in communication quality.

[0108] The inventors have studied the control of beam updating associated with BFD / BFR when BFR in units of TRPs is supported, and have conceived this embodiment.

[0109] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0110] In the present disclosure, "A / B" may mean "at least one of A and B" or may be read as A and B, or A or B. In the present disclosure, "A / B / C" may mean "at least one of A, B, and C" or may be read as A, B and C, or A, B, or C.

[0111] In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be interchangeable. In the present disclosure, index, ID, indicator, and resource ID may be interchangeable. In the present disclosure, support, control, controllable, operate, and operable may be interchangeable.

[0112] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read interchangeably.

[0113] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, higher layer, higher layer parameters, RRC information elements (IEs), and RRC messages may be read interchangeably.

[0114] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0115] In the present disclosure, MAC CE and activation / deactivation command may be read interchangeably.

[0116] In the present disclosure, panel, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameters, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS of QCL type D for TCI state / QCL assumption, RS of QCL type A for TCI state / QCL assumption, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, and PL-RS may be read interchangeably. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS having QCL type X, source of DL-RS, SSB, CSI-RS, and SRS may be read interchangeably.

[0117] In the present disclosure, panel, Uplink (UL) transmitting entity, TRP, spatial relationship, control resource set (CONTROLLER RESOLUTION SET (CORESET)), PDSCH, codeword, base station, antenna port of a certain signal (e.g., Demodulation Reference Signal (DMRS) port), antenna port group of a certain signal (e.g., DMRS port group), group for multiplexing (e.g., Code Division Multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CORESET subset, CW, redundancy version (RV), layer (MIMO layer, transmission layer, spatial layer) may be interchangeable. Also, panel identifier (ID) and panel may be interchangeable. In the present disclosure, the terms TRP ID, TRP Associated ID, CORESET Pool Index, the position of one of two TCI states corresponding to one code point of a field in a DCI (ordinal number, first TCI state or second TCI state), and TRP may be read interchangeably.

[0118] In the present disclosure, panel, UE panel, RS port group, DMRS port group, SRS port group, RS resource group, DMRS resource group, SRS resource group, beam group, TCI state group, spatial relationship group, SRS resource indicator (SRI) group, antenna port group, antenna group, and CORESET group may be read as interchangeable.

[0119] The panel may be associated with at least one of a panel ID, a UL TCI state, a UL beam, an L beam, a DL RS resource, and spatial relationship information.

[0120] In the present disclosure, the terms "multi-TRP," "multi-TRP system," "multi-TRP transmission," "multi-PDSCH," "channel using multi-TRP," "channel using multiple TCI states / spatial relationships," "multi-TRP being enabled by RRC / DCI," "multiple TCI states / spatial relationships being enabled by RRC / DCI," and "at least one of multi-TRP based on a single DCI" and "multi-TRP based on multiple DCI" may be interchangeable. In the present disclosure, the terms "multi-TRP based on multiple DCI," and "setting a CORESET pool index (CORESETPoolIndex) value of 1 for the CORESET" may be interchangeable. In the present disclosure, the terms "multi-TRP based on a single DCI," and "at least one code point in the TCI field is mapped to two TCI states" may be interchangeable.

[0121] In the present disclosure, the terms single TRP, single DCI, single PDCCH, multi-TRP based on single DCI, single TRP system, single TRP transmission, single PDSCH, channel using single TRP, channel using one TCI state / spatial relationship, multi-TRP not being enabled by RRC / DCI, multiple TCI states / spatial relationships not being enabled by RRC / DCI, a CORESETPoolIndex value of 1 not being set for any CORESET and no code point in the TCI field being mapped to two TCI states, and two TCI states on at least one TCI code point being activated may be read interchangeably.

[0122] In the present disclosure, TRP#1 (first TRP) may correspond to CORESET pool index = 0 or may correspond to the first of two TCI states corresponding to one code point in the TCI field, and TRP#2 (second TRP) may correspond to CORESET pool index = 1 or may correspond to the second of two TCI states corresponding to one code point in the TCI field.

[0123] In the present disclosure, CORESET0, CORESET with index 0, and common CORESET may be read interchangeably.

[0124] In addition, in the present disclosure, signaling configuration, signaling, setting, configuration, setting information, instruction, instruction information, etc. may be read interchangeably.

[0125] In the present disclosure, BFR, BFR setting, BFR procedure, BFD, BFD procedure, BFD-RS, BFD-RS setting, RLM, RLM setting, RLM procedure, RLM-RS, RLM-RS setting, NBI, NBI setting, NBI-RS, NBI-RS setting may be interchangeable. In the present disclosure, per cell BFR, cell-specific BFR, and BFR in Rel. 15 / 16 may be interchangeable. In the present disclosure, per TRP BFR, TRP-specific BFR, and BFR in Rel. 17 / Rel. 17 and later may be interchangeable.

[0126] In the following embodiments of the present disclosure, we will describe the case where the number of BFD-RS sets and the number of NBI-RS sets are a maximum of 2, but these numbers may be greater than 2, and ``two'' may be read as ``multiple.''

[0127] (Wireless communication method) A UE may be configured with a reference signal (e.g., BFD-RS) set for beam failure detection / a reference signal (e.g., NBI-RS) set for a candidate beam for a serving cell (or each BWP of the serving cell).

[0128] <BFD-RS / NBI-RS Configuration in Cell-Based BFR> The UE may be provided with a set q0 of BFD-RSs (e.g., periodic CSI-RS resource configuration indices) by higher layer parameters (e.g., failureDetectionResourcesToAddModList) for each BWP of the serving cell. The UE may also be provided with a set q1 of NBI-RSs (e.g., at least one of periodic CSI-RS resource configuration indices and SS / PBCH block indices) by higher layer parameters (e.g., candidateBeamRSList, candidateBeamRSListExt, or candidateBeamRSSCellList) for radio link quality measurement in the BWP of the serving cell.

[0129] <BFD-RS / NBI-RS Configuration in BFR per TRP> For each BWP of the serving cell, the UE configures two sets q of BFD-RS (e.g., periodic CSI-RS resource configuration indexes) instead of set q0 and set q1. 0,0 and set q 0,1 The UE may also determine the set q by using higher layer parameters (e.g., candidateBeamRSList1 and candidateBeamRSList2) for radio link quality measurement in the BWP of the serving cell. 0,0 and set q 0,1 a set q of two NBI-RSs (e.g., at least one of a periodic CSI-RS resource configuration index and an SS / PBCH block index) respectively corresponding to 1,0 and set q 1,1 may be provided. 0,0 is NBI-RS set q 1,0 and the BFD-RS set q 0,1 is NBI-RS set q 1,1 may be related to.

[0130] Two sets of BFD-RS (e.g., periodic CSI-RS resource configuration indexes) q 0,0 and set q 0,1may be set (e.g., set separately) by higher layer parameters related to beam failure detection resources, or may be set (e.g., set separately) by other higher layer parameters.

[0131] In addition, the two sets of BFD-RS, q 0,0 and set q 0,1 may be provided when the set q0 of BFD-RS is not provided. Alternatively, two sets q of BFD-RS may be provided when 0,0 and set q 0,1 is provided, the set q0 of BFD-RS may not be provided.

[0132] <First embodiment> In the first embodiment, an example of beam update control after BFR completion (or after receiving a BFR response) when single DCI-based multi-TRP is supported for a certain cell (or a BWP of a certain cell) and BFR on a TRP basis is applied will be described.

[0133] When single DCI-based multi-TRP is applied, the TCI field of the DCI may support indication of two TCI states, or a specific MAC CE (e.g., Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE) may be applied to indicate one or two TCI states for one codepoint in the TCI field of the DCI.

[0134] Also, when single DCI-based multi-TRP is applied, the CORESET pool index may not be set or only a specific CORESET pool index (e.g., 0) may be set.

[0135] When multi-DCI-based multi-TRP is applied, two CORESET pool indices (e.g., 0 and 1) may be set. In this case, a CORESET with no index indicated (or a CORESET other than CORESET pool index 1) may correspond to CORESET pool index 0.

[0136] For a UE, multiple (e.g., two) BFD-RS sets may be configured for each TRP (or BFR for each TRP). For example, two sets q of BFD-RS (e.g., periodic CSI-RS resource configuration indexes) may be configured by higher layer parameters. 0,0 and set q 0,1 may be provided to the UE.

[0137] Also, for the UE, a set q of two NBI-RSs (e.g., at least one of a periodic CSI-RS resource configuration index and an SS / PBCH block index) is 1,0 and set q 1,1 may be provided. NBI-RS set q 1,0 is the BFD-RS set q 0,0 and NBI-RS set q 1,1 is the BFD-RS set q 0,1 may be associated with.

[0138] Also, NBI-RS set q 1,0 and BFD-RS set q 0,0 is associated with the first TRP#1, and the NBI-RS set q 1,1 and BFD-RS set q 0,1 may be associated with the second TRP#2.

[0139] Also, configuration of an association between the TCI state of the CORESET (e.g., the active TCI state) and the BFD-RS set (explicitly configured BFD-RS set in RRC) may be supported. For example, the NBI-RS set q 1,0 / BFD-RS set 0,0 , and NBI-RS set q 1,1 / BFD-RS set 0,1 At least one of the above may be associated with the CORESET (or the active TCI state of the CORESET). Information regarding the association may be configured / instructed from the base station to the UE by higher layer parameters / MAC CE / DCI.

[0140] In single DCI-based multi-TRP, when DCI (or PDCCH / CORESET) is transmitted from the first TRP #1, NBI-RS set q 1,0 / BFD-RS set 0,0 may be associated with the CORESET (or the active TCI state of the CORESET) (see FIG. 3A). Alternatively, in the case of single DCI-based multi-TRP, when DCI (or PDCCH / CORESET) is transmitted from the second TRP #2, the NBI-RS set q 1,1 / BFD-RS set 0,1 may be associated with the CORESET (or the active TCI state of the CORESET) (see FIG. 3B).

[0141] In multi-DCI based TRP, NBI-RS set q 1,0 / BFD-RS set 0,0 is associated with the first CORESET (e.g., CORESET pool index 0) (see FIG. 4A), and the NBI-RS set q 1,1 / BFD-RS set 0,1 may be associated with a second CORESET (e.g., CORESET pool index 1) (see FIG. 4B).

[0142] In a single DCI-based multi-TRP, when two BFD-RS sets are configured for each TRP (or TRP BFR), the UE supports updating the DL beam of the PDCCH (or CORESET) associated with the BFD-RS set in which a beam failure is detected after receiving a BFR response (or after completing the BFR).

[0143] For example, if CORESET (or the TCI state of CORESET) is NBI-RS set q 1,0 / BFD-RS set 0,0(See FIG. 5.) In this case, the UE may determine whether to update the beam for the CORESET based on the BFR-RS set in which the beam failure was detected (e.g., depending on whether the BFD-RS set is associated with the CORESET (or the active TCI state of the CORESET)).

[0144] For example, the UE may have a BFD-RS set q 0,0 When a beam obstruction of NBI-RS set q is detected (or 1,0 ), after a predetermined period has elapsed since receiving the BFR response, the CORESET (or the TCI state of the CORESET) will be q 1,0 and q 0,0 For a CORESET associated with at least one of 1,0 The RS index may be selected from (e.g., the particular RS index reported).

[0145] In addition, the UE uses BFD-RS set q in FIG. 0,1 When a beam obstruction of NBI-RS set q is detected (or 1,1 ) the UE may not update the DL beam of the PDCCH (or CORESET). Note that the UE may assume the antenna port pseudo co-location parameters corresponding to qnew for channels / signals other than the PDCCH after a predetermined period has elapsed since receiving the BFR response. qnew is a parameter that is determined by the q 1,1 The RS index may be selected from (e.g., the particular RS index reported).

[0146] In this way, if there is no PDCCH (or CORESET) associated with the BFD-RS set in which beam failure is detected, the DL beam of the PDCCH (or CORESET) does not need to be updated. By determining whether or not to update the beam of the PDCCH / CORESET based on the CORESET and the BFD-RS set (or NBI-RS set) in which beam failure is detected, even when a single DCI-based multi-TRP is applied, the beam of the PDCCH / CORESET can be appropriately updated.

[0147] More specifically, the UE operation may be controlled as follows:

[0148] Set Q 0,0 and q 1,0 , and set q 0,1 and q 1,1 is associated with the wireless link quality, and the wireless link quality is determined by a predetermined value (Q out,LR ) For a serving cell with a worse performance than the above, the UE performs at least one of the following UE actions 1 to 4 after a predetermined period (for example, 28 symbols) from receiving a response signal from the base station through the BFR procedure.

[0149] In addition, a predetermined period (e.g., 28 symbols) after receiving a response signal from the base station may be a period after which a PUSH having the same HARQ process number as the second PUSH transmission is scheduled, and may be 28 symbols after the last symbol of the first (or initial) PDCCH reception having a DCI format with a toggled NDI field value.

[0150] <UE Operation 1> The UE responds to the first CORESET with q 1,0 UE Action 2: For the second CORESET, the UE assumes the antenna port quasi-co-location parameters corresponding to qnew (if any) from 1,1 Assume the antenna port quasi-co-location parameters corresponding to qnew (if any) from

[0151] UE Action 3: The UE is in the active TCI state. 1,0 For the CORESET (if set) associated with1,0 Assume the antenna port quasi-co-location parameters corresponding to qnew (if any) from . UE Action 4: The UE assumes that the active TCI state is q 1,1 For the CORESET (if set) associated with 1,1 Assume the antenna port quasi-co-location parameters corresponding to qnew (if any) from

[0152] UE operation 1 / 2 may be applied to multi-DCI-based multi-TRP. The first CORESET in UE operation 1 may correspond to COTESET pool index 0. The second CORESET in UE operation 2 may correspond to COTESET pool index 1.

[0153] UE operation 3 / 4 may be applied to single DCI based multi-TRP.

[0154] In this way, by defining / setting the beam update operation after BFR separately for multi-DCI-based multi-TRP and single-DCI-based multi-TRP, appropriate beam updates can be performed according to each transmission type.

[0155] [Modification 1] UE operation 3 / 4 may be as follows.

[0156] UE Action 3A: The UE is in the active TCI state q. 0,0 For the CORESET (if set) associated with 1,0 UE Action 4A: The UE assumes the antenna port quasi-co-location parameters corresponding to qnew (if any) from 0,1 For the CORESET (if set) associated with 1,1 Assume the antenna port quasi-co-location parameters corresponding to qnew (if any) from

[0157] In single DCI-based multi-TRP, the UE may control beam updates for the CORESET based on the association between the active TCI state of the CORESET and the BFD-RS set.

[0158] [Modification 2] UE operation 3 / 4 may be as follows.

[0159] UE Operation 3B: The UE performs q 0,0 For the CORESET (if set) associated with 1,0 UE Operation 4B: The UE assumes the antenna port quasi-co-location parameters corresponding to q new (if any) from 0,1 For the CORESET (if set) associated with 1,1 Assume the antenna port quasi-co-location parameters corresponding to qnew (if any) from

[0160] In a single DCI-based multi-TRP, the UE may control beam updates for the CORESET based on the association between the CORESET and a BFD-RS set.

[0161] [Modification 3] UE operation 3 / 4 may be as follows.

[0162] UE Operation 3C: The UE performs q 1,0 For the CORESET (if set) associated with 1,0 UE Operation 4C: The UE assumes the antenna port quasi-co-location parameters corresponding to q new (if any) from 1,1 For the CORESET (if set) associated with 1,1 Assume the antenna port quasi-co-location parameters corresponding to qnew (if any) from

[0163] In a single DCI-based multi-TRP, the UE may control beam updates for the CORESET based on the association between the CORESET and the NBI-RS set.

[0164] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal including: a receiving unit that receives information on a plurality of reference signal sets for beam failure detection and information on a plurality of reference signal sets for candidate beams; and a control unit that, when an indication of two TCI states is supported by a transmission configuration indicator (TCI) field in downlink control information, controls, after receiving a beam failure recovery response signal, to update an assumption of an antenna port quasi-co-location parameter for at least a control resource set associated with a reference signal set in which a beam failure has been detected. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the control unit controls the update of the antenna port quasi-co-location parameter for a control resource set whose active TCI state is associated with a reference signal set for a predetermined candidate beam, based on a reference signal index included in the predetermined candidate beam. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the active TCI state of the control resource set is associated with at least one of a reference signal set for beam failure detection and a reference signal set for a predetermined candidate beam. [Supplementary Note 4] The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the control resource set is associated with at least one of a reference signal set for a predetermined beam failure detection and a reference signal set for a predetermined candidate beam.

[0165] (Wireless Communication System) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0166] 6 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0167] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0168] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (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.

[0169] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0170] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0171] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0172] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

[0173] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0174] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0175] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0176] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0177] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0178] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0179] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0180] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), or the like may be used as an uplink channel.

[0181] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0182] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0183] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0184] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0185] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0186] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0187] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0188] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0189] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0190] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0191] 7 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0192] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0193] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0194] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0195] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0196] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0197] The transmitting / receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0198] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0199] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0200] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0201] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0202] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 130.

[0203] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0204] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0205] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0206] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0207] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0208] The transceiver 120 may transmit information regarding multiple reference signal sets for beam failure detection and information regarding multiple reference signal sets for candidate beams.

[0209] When the transmission configuration indicator (TCI) field of the downlink control information supports indication of two TCI states, the control unit 110 may control, after transmitting a beam failure recovery response signal, to update the antenna port pseudo-colocation parameters for at least the control resource set associated with the reference signal set in which the beam failure was detected.

[0210] (User Terminal) Fig. 8 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0211] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0212] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0213] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0214] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0215] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0216] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0217] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0218] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0219] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0220] The transmitter / receiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0221] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0222] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0223] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0224] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0225] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0226] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0227] The transceiver 220 may receive information regarding multiple reference signal sets for beam failure detection and information regarding multiple reference signal sets for candidate beams.

[0228] When the transmission configuration indicator (TCI) field of the downlink control information supports indication of two TCI states, the control unit 210 may, after receiving a response signal for beam failure recovery, control the updating of the assumption of antenna port pseudo-co-location parameters for at least the control resource set associated with the reference signal set in which the beam failure was detected.

[0229] The control unit 210 may control the update of the antenna port pseudo-colocation parameters based on a reference signal index included in a specified candidate beam for a control resource set whose active TCI state is associated with a reference signal set for the specified candidate beam.

[0230] The active TCI state of a control resource set may be associated with at least one of a reference signal set for a predetermined beam failure detection and a reference signal set for a predetermined candidate beam. The control resource set may be associated with at least one of a reference signal set for a predetermined beam failure detection and a reference signal set for a predetermined candidate beam.

[0231] (Hardware Configuration) Note that the block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0232] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0233] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 9 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0234] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0235] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0236] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0237] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0238] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0239] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0240] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0241] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0242] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0243] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0244] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0245] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0246] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0247] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0248] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0249] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0250] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0251] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0252] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0253] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0254] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0255] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0256] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0257] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0258] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may be composed of one or more resource blocks.

[0259] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0260] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0261] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0262] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0263] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0264] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0265] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0266] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0267] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0268] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0269] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0270] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0271] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0272] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0273] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0274] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0275] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), these wired and / or wireless technologies are included within the definition of transmission media.

[0276] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0277] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0278] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0279] 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 partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0280] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0281] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0282] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0283] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0284] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0285] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0286] 10 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0287] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0288] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0289] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0290] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0291] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0292] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0293] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0294] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0295] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0296] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0297] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0298] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0299] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0300] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0301] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0302] Each aspect / embodiment described in the present disclosure may be a technology other than 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 (x is, for example, an integer or decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0303] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0304] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0305] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0306] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0307] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "deciding" some action.

[0308] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0309] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

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

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

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

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

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

[0315] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with "i-th" (i is an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0316] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0317] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A receiver that receives information about a plurality of reference signal sets for beam fault detection and information about a plurality of reference signal sets for candidate beams, wherein the plurality of reference signal sets for beam fault detection and the plurality of reference signal sets for candidate beams are associated with each transmission / reception point (TRP); A terminal having a control unit that applies a spatial domain filter corresponding to a new candidate beam from a reference signal set for the candidate beam to the transmission of an uplink control channel (PUCCH) that applies a transmission setting instruction (TCI) state for each TRP after beam failure recovery (BFR) is completed.

2. A terminal as described in claim 1, wherein when multiple control resource set (CORESET) pool indices are set, the control unit applies a spatial domain filter corresponding to a new candidate beam from the reference signal set for the candidate beam to the transmission of a PUCCH that applies the TCI state for each CORESET.

3. Receiving information on a plurality of reference signal sets for beam fault detection and information on a plurality of reference signal sets for candidate beams, wherein the plurality of reference signal sets for beam fault detection and the plurality of reference signal sets for candidate beams are associated with each transmitting / receiving point (TRP); A wireless communication method for a terminal, comprising the steps of: after beam failure recovery (BFR) is completed, applying a spatial domain filter corresponding to a new candidate beam from a reference signal set for the candidate beam to the transmission of an uplink control channel (PUCCH) to which a transmission configuration indication (TCI) state for each TRP is applied.

4. A transmitter that transmits information about a plurality of reference signal sets for beam fault detection and information about a plurality of reference signal sets for candidate beams, wherein the plurality of reference signal sets for beam fault detection and the plurality of reference signal sets for candidate beams are associated with each transmission / reception point (TRP); A base station having a receiving unit that receives an uplink control channel (PUCCH) from a terminal to which a spatial domain filter corresponding to a new candidate beam is applied from a reference signal set for the candidate beam, for transmission of the uplink control channel (PUCCH) to which a transmission setting instruction (TCI) state for each TRP is applied after beam failure recovery (BFR) is completed.

5. A system having a terminal and a base station, The terminal A receiver that receives information about a plurality of reference signal sets for beam fault detection and information about a plurality of reference signal sets for candidate beams, wherein the plurality of reference signal sets for beam fault detection and the plurality of reference signal sets for candidate beams are associated with each transmission / reception point (TRP); A control unit that applies a spatial domain filter corresponding to a new candidate beam from a reference signal set for the candidate beam to a transmission of an uplink control channel (PUCCH) to which a transmission configuration indication (TCI) state for each TRP is applied after completion of beam failure recovery (BFR), The base station A system comprising a receiver for receiving the PUCCH.