Terminal, wireless communication method, base station and system

Abstract

A terminal according to an aspect of this disclosure includes a receiver that receives one or more settings for beam failure detection, and a controller that monitors, on the basis of the one or more settings, multiple reference signals corresponding to multiple communication points in the same carrier. An aspect of this disclosure makes it possible to appropriately perform a process related to a radio link / beam for multiple communication points.

Description

[Technical Field]

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

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

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

[0004] In existing LTE systems (e.g., 3GPP Rel. 8-14), a user equipment (UE) transmits uplink control information (UCI) using at least one of an UL data channel (e.g., a Physical Uplink Shared Channel (PUSCH)) and an UL control channel (e.g., a Physical Uplink Control Channel (PUCCH)). [Prior art documents] [Non-patent literature]

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

[0006] In future wireless communication systems, it is being considered that a terminal or an IAB node will communicate with multiple communication points (for example, base stations, IAB nodes, and terminals).

[0007] However, the processing related to the wireless links / beams for multiple communication points (e.g., wireless link monitoring, wireless link failure detection, beam failure detection, candidate beam detection, beam failure recovery) is not clear. If the processing related to the wireless links / beams for multiple communication points is not clear, the quality / reliability of communication may be reduced.

[0008] Therefore, the present disclosure provides a terminal and a wireless communication method that appropriately perform processing related to wireless links / beams for multiple communication points. 、 base station and systems One of the aims is to provide [Means for solving the problem]

[0009] A terminal according to one aspect of the present disclosure includes a receiver that receives one or more settings for beam failure detection, and a controller that monitors a plurality of reference signals corresponding to a plurality of communication points on the same carrier based on the one or more settings. The one or more settings include one setting common to the plurality of communication points. . [Effects of the Invention]

[0010] According to one aspect of the present disclosure, processing related to wireless links / beams can be appropriately performed for multiple communication points. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of the IAB. [Figure 2] FIG. 2 is a diagram illustrating an example of a BFR procedure. [Figure 3] FIG. 3 is a diagram illustrating an example of an inter-cell multi-TRP scenario. [Figure 4] 4A and 4B are diagrams illustrating an example of RLM for multiple points. [Figure 5] 5A and 5B are diagrams showing an example of BFD / CBD / BFR for multiple points. [Figure 6] FIG. 6 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 7] FIG. 7 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 8] FIG. 8 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 9] FIG. 9 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] (IAB node) The use of IAB (Integrated Access Backhaul) technology, which uses NR communications as a backhaul between base stations (or between base stations and relay stations), is being considered. In particular, IAB using NR communications using millimeter waves is expected to enable low-cost expansion of coverage areas.

[0013] An IAB node may have at least one function such as a DU (Distribution Unit), a CU (Central Unit), or an MT (Mobile Termination). Thus, an IAB node may function as a base station or as a user equipment (UE).

[0014] The IAB may also be referred to as a wireless backhaul. A link between nodes using the IAB may also be referred to as a backhaul (BH) link. A link between an IAB node and a UE may also be referred to as an access link. An IAB node may use NR-based communication for the backhaul link. An IAB node may use NR-based communication for the access link, or may use communication based on another RAT (Radio Access Technology).

[0015] The introduction of IAB is expected to improve frequency utilization efficiency, for example, because a base station can simultaneously or selectively use the same frequency for backhaul and UE access. For example, the backhaul link and the access link may be multiplexed using at least one of time division multiplexing (TDM), frequency division multiplexing (FDM), and space division multiplexing (SDM).

[0016] FIG. 1 is a diagram illustrating an example of an IAB configuration. In this example, three nodes (network nodes) AC are shown. Node A is connected to a core network via a wired backhaul (e.g., an optical fiber network). The node connected to the core network via the wired backhaul may be called an IAB donor.

[0017] A higher-level IAB node or IAB donor may be referred to as a parent IAB node, parent node, higher-level node, higher-level IAB node, etc. A lower-level IAB node may be referred to as a child IAB node, child node, lower-level node, etc. Here, higher-level may mean closer (fewer hops) to at least one of a base station (e.g., gNB), a wired backhaul, a core network, etc. Hereinafter, network nodes including IAB nodes and IAB donors may be simply referred to as nodes.

[0018] For example, in the example of Figure 1, node A is the parent node of node B, and node B is the parent node of node C. In this way, IAB may include multiple backhaul hops. Also, each node AC can communicate with a UE AC via an access link.

[0019] If a node has the function of an upper node, the node can accommodate a lower IAB node (connect to the lower IAB node via a BH link) and can accommodate a UE (connect to the UE via an access link). The upper node may schedule the lower IAB node and control the transmission or reception of the lower IAB node.

[0020] If an IAB node does not have the functionality of an upper node (for example, supports operation as a base station), the IAB node cannot accommodate a lower IAB node and can only accommodate UEs.

[0021] (Multi-TRP) In NR, one or more Transmission / Reception Points (TRPs) (multi-TRPs (MTRPs)) 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 using one or more panels.

[0022] Note that multiple TRPs may correspond to the same cell identifier (ID), or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0023] Multi-TRPs (e.g., TRPs #1 and #2) may be connected by ideal / non-ideal backhauls to exchange information, data, etc. Each TRP of the multi-TRP may transmit a different code word (CW) and a different layer. Non-Coherent Joint Transmission (NCJT) may be used as a form of multi-TRP transmission.

[0024] In the NCJT, for example, TRP#1 performs modulation mapping and layer mapping on a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding, and TRP#2 performs modulation mapping and layer mapping on a second codeword to transmit a second number of layers (e.g., two layers) with a second precoding.

[0025] Note that multiple PDSCHs (multi-PDSCHs) that are non-coherent may be defined as partially or completely overlapping in at least one of the time and frequency domains, i.e., a first PDSCH from a first TRP and a second PDSCH from a second TRP may overlap in at least one of the time and frequency resources.

[0026] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (Quasi-Co-Location (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).

[0027] Multiple PDSCHs from multiple TRPs (which may also be referred to as multiple PDSCHs) may be scheduled using one DCI (single DCI, single PDCCH) (single-master mode, single-DCI based multi-TRP). Multiple PDSCHs from multiple TRPs may also be scheduled using multiple DCIs (multiple DCI, multiple PDCCHs) (multi-master mode, multi-DCI based multi-TRP).

[0028] In URLLC for multiple TRPs, it is considered that PDSCH (transport block (TB) or codeword (CW)) repetition across multiple TRPs is supported. Repetition schemes (URLLC schemes, e.g., schemes 1, 2a, 2b, 3, and 4) across multiple TRPs in the frequency domain, layer (spatial) domain, or time domain are supported. In scheme 1, multiple PDSCHs from multiple TRPs are space division multiplexed (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are frequency division multiplexed (FDM). In scheme 2a, the redundancy version (RV) is the same for multiple TRPs. In scheme 2b, the RVs may be the same or different for multiple TRPs. 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.

[0029] Such a multi-TRP scenario allows for more flexible transmission control using good quality channels.

[0030] To support intra-cell (having the same cell ID) and inter-cell (having different cell IDs) multi-TRP transmission 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.

[0031] 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 transmission. In this case, the TRP may be replaced with a CORESET pool index. [Condition 1] A CORESET pool index of 1 is set. [Condition 2] Two different values ​​of the CORESET pool index (for example, 0 and 1) are set.

[0032] If the following condition is met, the UE may determine that the state is multi-TRP based on a single DCI, in which case the two TRPs may be interpreted as two TCI states indicated by the MAC CE / DCI. [conditions] "Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE" is used to indicate one or two TCI states for one codepoint of the TCI field in the DCI.

[0033] 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.

[0034] (Radio Link Monitoring (RLM)) In NR, Radio Link Monitoring (RLM) is used.

[0035] In NR, a base station may configure a Radio Link Monitoring Reference Signal (Radio Link Monitoring RS (RLM-RS)) for a UE for each BWP using higher layer signaling. The UE may receive configuration information for RLM (e.g., the "RadioLinkMonitoringConfig" information element of RRC).

[0036] The configuration information for the RLM may include fault detection resource configuration information (e.g., the upper layer parameter "failureDetectionResourcesToAddModList") and parameters related to the RLM-RS (e.g., the upper layer parameter "RadioLinkMonitoringRS").

[0037] The parameters related to the RLM-RS may include information indicating that it corresponds to the purpose of RLM, an index corresponding to the resource of the RLM-RS (e.g., an index included in the upper layer parameter "failureDetectionResources" (RadioLinkMonitoringRS in failureDetectionResourcesToAddModList)), etc. The index may be, for example, an index of the CSI-RS resource configuration (e.g., a non-zero power CSI-RS resource ID) or an SS / PBCH block index (SSB index). The purpose information may indicate a beam failure, a (cell-level) Radio Link Failure (RLF), or both.

[0038] The UE may identify the RLM-RS resource based on the index corresponding to the resource of the RLM-RS, and perform RLM using the RLM-RS resource.

[0039] The RLM-RS may be at least one of a primary synchronization signal (PSS: Primary SS), a secondary synchronization signal (SSS: Secondary SS), a mobility reference signal (MRS: Mobility RS), a CSI-RS, a demodulation reference signal (DMRS: Demodulation Reference Signal), a beam-specific signal, etc., or a signal constructed by extending and / or modifying these (e.g., a signal constructed by changing the density and / or period).

[0040] A UE may be configured to perform measurements using the RLM-RS resource by higher layer signaling. A configured UE may determine whether the radio link is in-sync (IS) or out-of-sync (OOS) based on the measurement results on the RLM-RS resource. A default RLM-RS resource may be specified in the specification for the UE to perform RLM when the base station does not configure the RLM-RS resource.

[0041] The UE determines whether the radio quality estimated (which may be referred to as measurement) based on at least a predetermined number of resources among all configured RLM-RS resources is equal to or exceeds a first threshold (Q in If the BER exceeds the BER (which may be referred to as BER), the wireless link may be determined to be IS.

[0042] The UE determines whether the estimated radio quality based on all configured RLM-RS resources is equal to or exceeds a second threshold (Q out If the radio quality is less than the reference quality (which may be referred to as OOS), the radio link may be determined to be OOS. Note that these radio qualities may be radio qualities corresponding to, for example, a hypothetical PDCCH block error rate (BLER).

[0043] IS / OOS determined periodically (periodically) may be called Periodic IS (P-IS) / Periodic OOS (P-OOS). For example, IS / OOS determined using RLM-RS may be P-IS / OOS.

[0044] The IS / OOS may be indicated from the physical layer in the UE to an upper layer (for example, a MAC layer, an RRC layer, etc.), and the RLF may be determined based on the IS / OOS indication.

[0045] When the UE receives N310 OOS notifications for a specific cell (e.g., a primary cell), it starts timer T310. While timer T310 is running, when the UE receives N311 IS notifications for the specific cell, it stops timer T310. When timer T310 expires, the UE determines that RLF has been detected for the specific cell.

[0046] Note that this method of determining RLF is not limited to this. The names N310, N311, T310, etc. are not limited to these. T310 may be called a timer for RLF detection, etc. N310 may be called the number of OOS notifications for starting timer T310, etc. N311 may be called the number of IS notifications for stopping timer T310, etc.

[0047] (RLM-RS) In the Rel.16 RLM procedure, the UE follows the implicit RLM-RS determination procedure:

[0048] [Implicit RLM-RS determination procedure] If the UE is not provided with a Radio Link Monitoring RS (RLM-RS) and the UE is provided with a TCI state including one or more CSI-RS for PDCCH reception, the UE shall follow steps 1 to 4 below.

[0049] Step 1 If the active TCI state for PDCCH reception includes only one RS, the UE uses the RS provided for the active TCI state for PDCCH reception for RLM. Step 2 If the active TCI state for PDCCH reception includes two RSs, the UE assumes that one RS has QCL type D, and the UE uses that RS with QCL type D for RLM. The UE does not assume that both RSs have QCL type D. Step 3 The UE is not required to use aperiodic or semi-persistent RS for RLM. Step 4 For Lmax=4, the UE selects the NRLM RSs provided for the active TCI state for PDCCH reception among multiple CORESETs associated with multiple search space sets in order from the smallest monitoring periodicity. If more than one CORESET is associated with multiple search space sets with the same monitoring periodicity, the UE determines the order of CORESETs from the highest CORESET index.

[0050] where Lmax is the maximum number of SS / PBCH block indexes in a cell. The maximum number of SS / PBCH blocks transmitted in a half-frame is Lmax.

[0051] Thus, if the UE is not provided with an RLM-RS, the UE makes an implicit RLM-RS (default RLM-RS resource) decision and uses the active TCI state for PDCCH reception for RLM. When Lmax=4, the UE first selects NRLM RSs in ascending order of the monitoring period of the search space set, then in descending order of CORESET index. Select the CORESET.

[0052] A UE can be configured with up to NLR-RLM RLM-RSs for link recovery procedures and RLM. Of the NLR-RLM RLM-RSs, up to NRLM RLM-RSs are used for RLM depending on Lmax. In Rel. 16, NRLM=2 when Lmax=4, NRLM=4 when Lmax=8, and NRLM=8 when Lmax=64.

[0053] (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 called a transmit beam or Tx beam) and a beam used to receive a signal (also called a receive beam or Rx beam).

[0054] When beamforming is used, it is expected that radio link quality will deteriorate due to increased susceptibility to interference from obstacles. This deterioration in radio link quality may lead to frequent radio link failures (RLF). Since RLF requires cell reconnection, frequent RLF occurrences will result in a degradation of system throughput.

[0055] In NR, in order to suppress the occurrence of RLF, when the quality of a specific beam deteriorates, a procedure for switching to another beam (which may also be called Beam Recovery (BR), Beam Failure Recovery (BFR), or L1 / L2 (Layer 1 / Layer 2) beam recovery) is performed. The BFR procedure may also be simply called BFR.

[0056] Note that a beam failure (BF) in this disclosure may also be referred to as a link failure.

[0057] 2 is a diagram showing an example of a BFR 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.

[0058] The RS may be at least one of a Synchronization Signal Block (SSB) and a Channel State Information RS (CSI-RS). The SSB may also be called an SS / PBCH (Physical Broadcast Channel) block.

[0059] 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.

[0060] In step S102, the UE cannot detect the BFD-RS (or the reception quality of the RS is degraded) due to radio wave jamming from the base station. Such jamming can be caused by, for example, obstacles, fading, interference, etc. between the UE and the base station.

[0061] The UE detects a beam failure when a predetermined condition is met. The UE may detect the occurrence of a beam failure, for example, when the Block Error Rate (BLER) is less than a threshold for all configured BFD-RS (BFD-RS resource configurations). When the occurrence of a beam failure is detected, the lower layer (physical (PHY) layer) of the UE may notify (indicate) a beam failure instance to the upper layer (MAC layer).

[0062] The criteria for the determination are not limited to BLER, but may be Layer 1 Reference Signal Received Power (L1-RSRP) in the physical layer. Also, instead of or in addition to RS measurement, beam failure detection may be performed based on a downlink control channel (PDCCH). The BFD-RS may be expected to be quasi-co-located (QCL) with the DMRS of the PDCCH monitored by the UE.

[0063] Here, QCL is an index that indicates the statistical properties of a channel. For example, if a signal / channel and another signal / channel have a QCL relationship, it may mean that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same between these different signals / channels (i.e., they are QCLs with respect to at least one of these).

[0064] The spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be determined based on a spatial QCL. A QCL (or at least one element of a QCL) in the present disclosure may be replaced with an sQCL (spatial QCL).

[0065] Information about BFD-RS (e.g., RS index, resource, number, number of ports, precoding, etc.), information about beam fault detection (BFD) (e.g., the above-mentioned threshold), etc. may be configured (notified) to the UE using higher layer signaling, etc. Information about BFD-RS may also be referred to as information about BFR resources, etc.

[0066] When a higher layer (e.g., MAC layer) of the UE receives a beam failure instance notification from the PHY layer of the UE, it may start a predetermined timer (which may be called a beam failure detection timer). If the MAC layer of the UE receives a certain number of beam failure instance notifications (e.g., beamFailureInstanceMaxCount configured by RRC) before the timer expires, it may trigger a BFR (e.g., start one of the random access procedures described below).

[0067] If there is no notification from the UE, or if the base station receives a predetermined signal (beam recovery request in step S104) from the UE, the base station may determine that the UE has detected a beam failure.

[0068] In step S103, the UE starts searching for a new candidate beam (candidate beam detection (CBD)) 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 candidate beam detection RS (CBD-RS), a new candidate RS, a new candidate beam identification RS (NCBI-RS), a CBI-RS, a CB-RS (Candidate Beam RS), or the like. The NCBI-RS may be the same as or different from the BFD-RS. Note that the new candidate beam may simply be called a candidate beam or candidate RS.

[0069] The UE may determine a beam corresponding to an RS that satisfies a predetermined condition as a new candidate beam. The UE may determine a new candidate beam, for example, based on an RS whose L1-RSRP exceeds a threshold among the configured NCBI-RSs. Note that the criteria for determination are not limited to L1-RSRP. The L1-RSRP for SSB may be called SS-RSRP. The L1-RSRP for CSI-RS may be called CSI-RSRP.

[0070] Information about the NCBI-RS (e.g., RS resources, number of ports, precoding, etc.), information about the new candidate beam identification (NCBI) (e.g., the above-mentioned threshold), etc. may be configured (notified) to the UE using higher layer signaling, etc. Information about the new candidate RS (or NCBI-RS) may be acquired based on information about the BFD-RS. Information about the NCBI-RS may be referred to as information about NBCI resources, etc.

[0071] Note that BFD-RS, NCBI-RS, etc. may be read as Radio Link Monitoring RS (RLM-RS).

[0072] In step S104, the UE that has identified the new candidate beam transmits a beam failure recovery request (BFRQ). The beam recovery request may also be called a beam recovery request signal, a beam failure recovery request signal, or the like.

[0073] 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.

[0074] 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.

[0075] In Rel. 15 NR, contention-based BFR (CB-BFR), which is a BFR based on a contention-based random access (RA) procedure, and contention-free BFR (CF-BFR), which is a BFR based on a contention-free random access procedure, are under consideration. In CB-BFR and CF-BFR, a UE may transmit a preamble (also referred to as an RA preamble, a random access channel (Physical Random Access Channel (PRACH)), a RACH preamble, etc.) as a BFRQ using a PRACH resource.

[0076] In CB-BFR, a UE may transmit a preamble randomly selected from one or more preambles. In CF-BFR, a UE may transmit a preamble assigned specifically to the UE by the base station. In CB-BFR, a base station may assign the same preamble to multiple UEs. In CF-BFR, a base station may assign a preamble individually to each UE.

[0077] Note that CB-BFR and CF-BFR may be referred to as CB PRACH-based BFR (CBRA-BFR) and CF PRACH-based BFR (CFRA-BFR), respectively. CBRA-BFR may be referred to as CBRA for BFR. CFRA-BFR may be referred to as CFRA for BFR.

[0078] Regardless of whether CB-BFR or CF-BFR is used, information about the PRACH resource (RA preamble) may be notified by, for example, higher layer signaling (such as RRC signaling). For example, the information may include information indicating a correspondence relationship between the detected DL-RS (beam) and the PRACH resource, and a different PRACH resource may be associated with each DL-RS.

[0079] In step S105, the base station that has detected the BFRQ transmits a response signal (which may be referred to as a gNB response, etc.) to the BFRQ from the UE. The response signal may include reconfiguration information (e.g., DL-RS resource configuration information) for one or more beams.

[0080] The response signal may be transmitted, for example, in the UE common search space of the PDCCH. The response signal may be signaled using a PDCCH (DCI) scrambled with a cyclic redundancy check (CRC) by a UE identifier (e.g., a Cell-Radio RNTI (C-RNTI)). The UE may determine at least one of a transmit beam and a receive beam to use based on the beam reconfiguration information.

[0081] 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.

[0082] For CB-BFR, contention resolution may be determined to be successful if the UE receives a PDCCH corresponding to the C-RNTI associated with the UE.

[0083] Regarding the process of step S105, a period for the UE to monitor a response to the BFRQ from a base station (e.g., a gNB) may be set. This period may be referred to as, for example, a gNB response window, a gNB window, a beam recovery request response window, etc. If no gNB response is detected within this window period, the UE may retransmit the BFRQ.

[0084] 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.

[0085] 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.

[0086] Rel.15 supports the use of a random access procedure to perform beam recovery procedures (e.g., BFRQ notification) for beam failures detected in an SpCell (PCell / PSCell). On the other hand, Rel.16 supports the use of at least one of PUCCH (e.g., Scheduling Request (SR)) transmission for BFR and MAC CE (e.g., UL-SCH) transmission for BFR to perform beam recovery procedures (e.g., BFRQ notification) for beam failures detected in an SCell.

[0087] For example, the UE may transmit information about beam failure using MAC CE-based two-step. The information about beam failure may include information about the cell that detected the beam failure and information about new candidate beams (or new candidate RS indices).

[0088] [Step 1] If a BF is detected, a PUCCH-BFR (scheduling request (SR)) may be transmitted from the UE to the PCell / PSCell. Then, an UL grant (DCI) for step 2 below may be transmitted from the PCell / PSCell to the UE. If a beam failure is detected and there is a MAC CE (or UL-SCH) for transmitting information about a new candidate beam, step 1 (e.g., PUCCH transmission) may be omitted and step 2 (e.g., MAC CE transmission) may be performed.

[0089] [Step 2] Then, 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 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.

[0090] Note that the numbers of these steps are for explanatory purposes only, and multiple steps may be combined or the order may be reversed. Furthermore, whether to perform BFR may be configured in the UE using higher layer signaling.

[0091] (BFD-RS) In Rel. 16, for each BWP of one serving cell, the UE may be provided with a set of periodic (P)-CSI-RS resource configuration indices q0 via failure detection resources (failureDetectionResources, failureDetectionResourcesToAddModList, RadioLinkMonitoringConfig) and at least one set of P-CSI-RS resource configuration indices and SS / PBCH block indices q1 via the candidate beam RS list (candidateBeamRSList) or the extended candidate beam RS list (candidateBeamRSListExt-r16) or the candidate beam RS list for SCell (candidateBeamRSSCellList-r16).

[0092] 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.

[0093] The set of P-CSI-RS resources q0 provided by the failure detection resources may be referred to as explicit BFD-RS.

[0094] 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.

[0095] In the present disclosure, providing the above-mentioned higher layer parameters indicating information on indexes corresponding to BFD resources may be interchangeably read as configuring BFD resources, configuring a BFD-RS, etc. In the present disclosure, BFD resources, periodic CSI-RS resource configuration index or SSB index set q0, BFD-RS, BFD-RS set, and RS set may be interchangeably read.

[0096] If the UE is not provided with q0 by the failure detection resources (failureDetectionResources) for one of the BWPs of its serving cell, the UE determines the RS (set q0) to use for the BFD procedure according to the following implicit BFD-RS (default BFD-RS resource) determination procedure:

[0097] [Implicit BFD-RS Decision Procedure] The UE determines to include in set q0 P-CSI-RS resource configuration indices that have the same value as the RS indices in the RS set indicated by the TCI state (TCI-State) for the corresponding CORESET that the UE uses to monitor the PDCCH. If there are two RS indices in one TCI state, set q0 includes RS indices that have a QCL type D configuration for the corresponding TCI state. The UE assumes that set q0 includes up to two RS indices. The UE assumes single-port RSs in set q0.

[0098] This set q0 may be called the implicit BFD-RS.

[0099] In this way, the UE determines the BFD-RS (RS set) according to the TCI state for the PDCCH. The UE assumes that the RS set includes up to two RSs.

[0100] (analysis) The following are possible candidates for consideration (requirements) for future wireless communication systems (e.g., Beyond 5G, 6G). - Development of new frequency bands (frequencies above 100 GHz, terahertz band, etc.) Further increase in speed in the existing 5G frequency band (100 GHz or less) (for example, narrower beams, coordinated transmission and reception between base stations, coordinated transmission and reception between devices, etc.) - Further stabilization and reliability of communications - Reduction of terminal power consumption (transmission power) (e.g., utilization of close-proximity communication) Mesh network configuration, utilizing multiple communication links (connections) in the same frequency band

[0101] In the existing LTE / NR, a terminal (UE) connects to one base station on a certain frequency (carrier), and operates according to instructions from the base station to which it is connected on that frequency.

[0102] Even when a sidelink is set up for terminal-to-terminal communication, the terminal performs sidelink operation based on instructions from one base station.

[0103] As an exception, in Rel. 17 multi-input multi-output (MIMO), a scenario is being considered in which multiple TRPs using different cells (inter-cell multi-TRPs) communicate with a terminal. For example, as shown in the example of Figure 3, a gNB uses TRPs #0, #1, and #2, and TRPs #0, #1, and #2 may be associated with physical cell IDs (PCIs) #0, #1, and #2, respectively. For PDSCH / PDCCH, multiple cells (a serving cell using TRP #0 and a non-serving cell using TRP #1) are configured on the same frequency carrier, and a terminal (UE) communicates with a base station (gNB) using both the serving cell and the non-serving cell.

[0104] In Rel. 17 IAB, the scenario of intra-carrier DC (where an IAB node connects to two parent nodes on the same frequency) is discussed.

[0105] In a scenario where a terminal has multiple communication points (multiple base stations, or a base station and surrounding terminals) within the same frequency carrier, in order to ensure reliability, it is necessary to be able to maintain communication even if any of the links to the communication points is broken (even if communication quality deteriorates).

[0106] In existing LTE / NR, if a terminal loses connection with a base station (serving cell) on a certain frequency, it will no longer be able to use settings for other links (e.g., TRPs of non-serving cells or side links with neighboring terminals). Therefore, it is preferable not to rely on specific links (TRPs, connections, beams).

[0107] If the number of available links is limited, it may be necessary to manage the quality of each link. For example, if the quality of a link deteriorates, the terminal may switch the link to another connection.

[0108] In an inter-cell multi-TRP scenario, it is considered that multiple TRPs in one base station each correspond to a serving cell or a non-serving cell.

[0109] However, when a terminal or an IAB node communicates with multiple communication points, and the multiple communication points are base stations / IAB nodes / terminals, the management of wireless links for the multiple communication points (wireless link monitoring / processing for wireless link failures) is not clear. If the management of wireless links for the multiple communication points is not clear, there is a risk of a decrease in communication quality / reliability.

[0110] Therefore, the present inventors have conceived a method for managing wireless links to multiple communication points.

[0111] Furthermore, when a terminal or IAB node communicates with multiple communication points, and the multiple communication points are base stations / IAB nodes / terminals, the management of beam failures for the multiple communication points (beam failure detection / candidate beam detection / beam failure recovery) is not clear. If the management of beam failures for the multiple communication points is not clear, it may lead to a decrease in communication quality / reliability.

[0112] Therefore, the present inventors have conceived a method for managing beam obstructions to multiple communication points.

[0113] 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.

[0114] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read as interchangeable. In the present disclosure, cell, serving cell, CC, carrier, frequency carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as interchangeable. In the present disclosure, index, ID, indicator, and resource ID may be read as interchangeable. In the present disclosure, support, control, controllable, operate, and operable may be read as interchangeable.

[0115] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read interchangeably.

[0116] 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 interchangeable.

[0117] 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.

[0118] In the present disclosure, MAC CE and activation / deactivation command may be read interchangeably.

[0119] In the present disclosure, the terms pool, set, group, list, and candidate may be read interchangeably.

[0120] In the present disclosure, the terms DMRS, DMRS port, and antenna port may be interpreted as interchangeable.

[0121] In the present disclosure, the terms special cell, SpCell, PCell, and PSCell may be read interchangeably.

[0122] In this disclosure, the terms 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 parameter, spatial-domain receive filter, UE spatial-domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS for QCL type D in TCI state / QCL assumption, RS for QCL type A in 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 interchangeable. In this disclosure, the terms QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS, and SRS may be interchangeable.

[0123] In the present disclosure, the terms panel, Uplink (UL) transmitting entity, TRP, spatial relationship, control resource 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), and 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 related ID, CORESET pool index, the position of one of two TCI states corresponding to one code point in a field in a DCI (ordinal number, first TCI state or second TCI state), and TRP may be read interchangeably.

[0124] The TRP may be associated with at least one of the following parameters: CORESET Pool Index = {0, 1} ·1st TCI state, 2nd TCI state ·1st CDM group, 2nd CDM group (of PDSCH DMRS) 1st PDSCH, 2nd PDSCH ·RS port group, panel index, TCI-state / Quasi Co Location(QCL) / spatial-relation group index = {0, 1}

[0125] Note that these are for the case where the terminal uses two TRPs, and similar settings can be made when using more TRPs.

[0126] (Wireless communication method) A terminal may communicate (simultaneously) with multiple communication points on one frequency carrier. A terminal may communicate (simultaneously) with multiple communication points on each of multiple frequency carriers. A terminal may communicate (simultaneously) with at least one of multiple communication points on multiple frequency carriers.

[0127] In the present disclosure, communication point, communication partner, communication destination, cell, cell providing point, access point, node, connection destination, TRP, point, terminal, UE, IAB node, IAB-MT, base station, wireless communication device, vehicle, mobile body, communication link, communication relationship, association, channel, path, direction, beam, panel, spatial domain filter, TRP associated with serving cell / non-serving cell, and peripheral terminal communicating with a terminal using a sidelink may be read as interchangeable.

[0128] In the present disclosure, the terms terminal, UE, IAB node, communication point, lower communication point, child node, lower node, base station, wireless communication device, vehicle, and moving body may be interpreted as interchangeable.

[0129] In the present disclosure, the terms network (NW), base station, IAB node, communication point, upper communication point, parent node, upper node, terminal, wireless communication device, vehicle, and mobile object may be interpreted as interchangeable.

[0130] A wireless link may be established between the terminal and each communication point.

[0131] A terminal may receive settings / instructions from an upper communication point. The upper communication point may be a base station, an IAB node (an IAB node having base station functionality), etc. A lower communication point may receive settings / instructions from an upper communication point. A lower communication point may be a terminal, an IAB node (an IAB node having terminal functionality), etc. An upper communication point may accommodate one or more lower communication points (and may send settings / instructions to one or more lower communication points).

[0132] A communication point group may include one or more communication points. One or more communication points included in one communication point group may be accommodated by one upper communication point (or may be set / instructed by one upper communication point).

[0133] In the present disclosure, the operation of a terminal may be interpreted as the operation of an IAB node. When a communication point that communicates with an IAB node is an upper communication point, the IAB node may perform the operation of a terminal with respect to the upper communication point (for example, receive a setting / instruction / reference signal from the upper communication point).

[0134] In the present disclosure, the operation of a base station may be interpreted as the operation of an IAB node. When a communication point that communicates with an IAB node is a lower communication point, the IAB node may perform the operation of a base station for the lower communication point (for example, transmitting a setting / instruction / reference signal to the lower communication point).

[0135] A communication point may be identified by an index indicating at least one of location / space / direction (TRP, CORESET pool, TCI state, spatial relationship, CDM group, beam, spatial domain filter, cell, etc.), frequency (serving cell, CC, etc.), cell, cell group, and communication point group.

[0136] A terminal may initiate / establish communication / connection / link with a communication point by receiving a signal (reference signal / synchronization signal) from the communication point. A terminal may initiate communication / connection / link with a communication point by transmitting a signal (reference signal / synchronization signal) to the communication point. A terminal may initiate / establish communication / connection / link with another communication point based on a setting from the communication point.

[0137] In the present disclosure, re-establishment, re-establishment, connection re-establishment, RRC connection re-establishment, reconnection, radio link establishment, communication initiation, random access, failure recovery, and BFR may be read interchangeably.

[0138] First Embodiment For multiple communication points on one frequency carrier, the terminal may follow at least one of the following aspects 1-1 to 1-3.

[0139] <<Aspect 1-1>> RLM When a terminal / IAB node has multiple communication points on the same frequency carrier, it may perform RLM (Radio Link Quality Measurement / Determination) for the multiple communication points. The terminal may follow at least one of the following aspects 1-1-1 and 1-1-2.

[0140] [Aspect 1-1-1] The terminal may receive multiple RLM configurations corresponding to multiple communication points (or may receive an RLM configuration for each communication point). The terminal may receive an RLM configuration that is common to all or some of the multiple communication points. The terminal may receive an RLM configuration that is common to all or some of the multiple communication points and an RLM configuration for each of all or some of the multiple communication points.

[0141] The RLM configuration method can be any of the following RLM configuration methods 1 to 3.

[0142] [[RLM Setup Method 1]] The terminal receives an independent RLM configuration for each communication point.

[0143] The terminal may monitor a reference signal (RLM-RS) configured for each communication point and determine an in-sync state or an out-of-sync state for each communication point. If a specific condition for a communication point is met, the terminal may determine (the occurrence of) an RLF for that communication point. The specific condition may be the expiration of a timer (T310 timer) configured for that communication point.

[0144] [[RLM Setup Method 2]] The terminal receives an RLM configuration that is common to multiple communication points.

[0145] A plurality of reference signals (RLM-RS) corresponding to the plurality of communication points may be configured (the plurality of reference signals may be transmitted from the plurality of communication points, respectively). The terminal may monitor the plurality of reference signals and determine whether the plurality of communication points are in an in-sync state or an out-of-sync state as a whole. If the quality of one or more of the plurality of reference signals is equal to or greater than a threshold, the terminal may determine that the plurality of communication points are in an in-sync state as a whole. If the quality of all of the plurality of reference signals is lower than a threshold, the terminal may determine that the plurality of communication points are in an out-of-sync state as a whole. If a specific condition is met, the terminal may determine that an RLF has occurred. The specific condition may be the expiration of a timer (T310 timer) configured commonly for the plurality of communication points.

[0146] [[RLM Setup Method 3]] The terminal receives a common RLM configuration for multiple communication points and determines whether it is in-sync or out-of-sync for each communication point.

[0147] A plurality of reference signals (RLM-RS) corresponding to a plurality of communication points may be configured (the plurality of reference signals may be transmitted from a plurality of communication points, respectively). The terminal may monitor the plurality of reference signals and determine whether each communication point is in-sync or out-of-sync. When a specific condition is satisfied, the terminal may determine that an RLF has occurred. The specific condition may be that a specific number or more of the plurality of communication points are in an out-of-sync state and a timer (T310 timer) expires.

[0148] A first parameter of the RLM configuration may be a parameter specific to a communication point. The first parameter may include an RLM-RS corresponding to (transmitted from) the communication point. A second parameter of the RLM configuration may be a parameter common to multiple communication points. The second parameter may include at least one of a threshold for in-sync or out-of-sync and a timer for RLF.

[0149] [Aspect 1-1-2] The parameters related to the RLM may be set separately for each communication point or each communication point group. For example, the terminal may receive the parameters related to the RLM of each communication point from the communication point, or may receive the parameters related to the RLM of each communication point from the communication point (upper communication point) that accommodates the communication point group.

[0150] The parameters related to RLM may be set commonly to multiple communication points or multiple communication point groups. For example, the terminal may receive parameters related to RLM for all or part of multiple communication points from a specific communication point.

[0151] If a communication point is an upper communication point (e.g., a base station or an IAB node), the terminal may receive parameters related to the RLM of the communication point from the communication point. If a communication point is a lower communication point (e.g., a terminal or an IAB node), the terminal may receive parameters related to the RLM of the communication point from an upper communication point accommodating the communication point. The upper communication point may correspond to a PCell / PSCell.

[0152] <<Aspect 1-2>> Actions / Procedures for RLF The specification may specify an operation regarding RLF / communication point change when a terminal / IAB node is configured with multiple RLMs corresponding to multiple communication points on the same frequency carrier. The terminal may follow at least one of the following aspects 1-2-1 and 1-2-2.

[0153] [Aspect 1-2-1] Different terminal operations may be specified when an RLF occurs in only some of multiple communication points (multiple RLMs, multiple RLM-RSs) and when an RLF occurs in all of the multiple communication points, or a common terminal operation may be specified. Different terminal operations may be specified when an RLF occurs in a specific communication point (specific RLM, specific RLM-RS) among the multiple communication points and when an RLF does not occur, or a common terminal operation may be specified. The specific communication point may be a communication point (upper communication point) that transmits the RLM configuration, or may correspond to a PCell / PSCell. The specific communication point may be configured by an upper communication point, or may be updated based on a notification such as a MAC CE or DCI.

[0154] Actions taken on the RLF may follow any of the following RLF actions 1 to 3.

[0155] [[RLF Action 1]] If RLF occurs in only some of multiple communication points, the terminal deletes the configuration information (RRC IE) related to the communication point where RLF occurred, and retains the configuration information (RRC IE) related to the other communication points (communication points where RLF has not occurred) among the multiple communication points.

[0156] [[RLF Action 2]] When an RLF occurs at a specific communication point, the terminal deletes configuration information (RRC IEs) related to one or more communication points configured by the specific communication point. The specific communication point may be a specific upper communication point (e.g., a base station / IAB node), may be a communication point that transmitted the RLM configuration, or may correspond to a PCell / PSCell.

[0157] [[RLF Action 3]] If an RLF occurs in all communication points on that frequency carrier, the terminal may report the RLF occurrence, perform a reconnection establishment procedure, or perform both the report and the reconnection establishment procedure on another frequency carrier. The another frequency carrier may correspond to a PCell / PSCell. The another frequency carrier may be configured by an upper communication point or may be updated based on a notification such as a MAC CE or DCI.

[0158] For example, if a terminal communicates with multiple communication points across multiple frequency carriers, the multiple frequency carriers including a master frequency carrier and a secondary frequency carrier, RLF occurs at all communication points on the secondary frequency carriers, and a radio link (in-sync state, no RLF state) exists to at least one communication point on the master frequency carrier, the terminal may report the RLF occurrence on the master frequency carrier.

[0159] For example, if a terminal communicates with multiple communication points across multiple frequency carriers, and RLF occurs in all communication points on a first frequency carrier and there is a radio link to at least one communication point on a second frequency carrier, the terminal may report an RLF occurrence on the second frequency carrier.

[0160] [Aspect 1-2-2] When an RLF occurs in at least some of multiple communication points (multiple RLMs, multiple RLM-RSs), the terminal may report information about the occurrence of the RLF to the NW, may start a process to establish a reconnection to another communication point, or may perform both the report and the communication establishment process. In this case, for example, the terminal may perform at least one of reporting information about the occurrence of the RLF and the process to establish a communication with another communication point, for each communication point.

[0161] In the example of Figure 4A, UE#0 communicates with multiple communication points. The multiple communication points are gNB#1, gNB#2, and UE#1. UE#0 performs RLM for each communication point. Thereafter, as in the example of Figure 4B, if UE#0 detects / determines RLF in RLM for UE#1, UE#0 may report RLF to gNB#2 and perform establishment processing with another communication point / frequency carrier, or may perform establishment processing with UE#2 and change the communication point from UE#1 to UE#2.

[0162] <<Aspect 1-3>>UE Capabilities The terminal (IAB-MT) may report whether it supports RLM for multiple communication points on the same frequency carrier as UE capability.

[0163] A terminal's support of RLM for multiple communication points on the same frequency carrier may be a prerequisite that the terminal supports communication with multiple communication points on the same frequency carrier (simultaneous communication).

[0164] The terminal may report whether or not it supports RLM for multiple communication points on the same frequency carrier, independently of the status of FR / frequency band / duplex mode / necessity of sensing (necessity of channel access procedure, licensed spectrum or unlicensed (shared) spectrum) / serving cell type (SpCell or SCell).

[0165] The terminal may independently report whether it supports RLM for each communication point (RLM setting) and whether it supports RLM common to multiple communication points (RLM setting).

[0166] The terminal may report the number (maximum number) of RLMs that can be performed simultaneously on the same frequency carrier and the number (maximum number) of RLMs that can be performed simultaneously on all frequency carriers.

[0167] At least one of the values ​​(range, granularity) that can be reported as UE capabilities and the values ​​(range, granularity) that can be set as parameters related to RLM may differ depending on the FR / frequency band / terminal type (e.g., UE or IAB-MT). For example, the number of RLMs that can be simultaneously performed on frequency carriers in a first frequency range (e.g., FR1) may be fewer than the number of RLMs that can be simultaneously performed on frequency carriers in a second frequency range (a frequency range higher than the first frequency range, e.g., FR2). For example, the number of RLMs that a UE can simultaneously perform on one frequency carrier may be fewer than the number of RLMs that an IAB-MT can simultaneously perform on one frequency carrier.

[0168] According to this embodiment, wireless links to multiple communication points can be monitored / changed, thereby improving the reliability of communication.

[0169] <Second embodiment> For multiple communication points on one frequency carrier, the terminal may follow at least one of the following aspects 2-1 to 2-3.

[0170] <<Aspect 2-1>> BFD / CBD / BFR When a terminal / IAB node has multiple communication points on the same frequency carrier, it may perform BFD / CBD / BFR for the multiple communication points. The terminal may follow at least one of the following aspects 2-1-1 and 2-1-2.

[0171] [Aspect 2-1-1] The terminal may receive multiple BFD / CBD / BFR configurations corresponding to multiple communication points (or may receive a BFD / CBD / BFR configuration for each communication point). The terminal may receive a BFD / CBD / BFR configuration common to all or some of the multiple communication points. The terminal may receive a BFD / CBD / BFR configuration common to all or some of the multiple communication points and a BFD / CBD / BFR configuration for each of all or some of the multiple communication points. The BFD / CBD / BFR configuration method may follow any of the following BFD / CBD / BFR configuration methods 1 to 3.

[0172] [[BFD / CBD / BFR setting method 1]] The terminal receives independent BFD / CBD / BFR configuration for each communication point.

[0173] The terminal may monitor the reference signal (BFD-RS) set for each communication point and determine beam failure for each communication point.

[0174] When a beam failure for a certain communication point is detected, the terminal may perform CBD based on a reference signal (CBD-RS) configured for the communication point, and may transmit a BFR request to at least one of the communication point, another communication point, and a communication point on another frequency carrier (a communication point corresponding to the beam failure, a specific communication point, or a specific communication point in the communication point group in which the beam failure occurred). The other communication point may be a communication point corresponding to a candidate beam detected by CBD. The specific communication point may be a communication point that transmitted the BFD / CBD / BFR configuration, or may be an upper communication point (e.g., a base station / IAB node) accommodating the communication point group in which the beam failure occurred, or may correspond to a PCell / PSCell.

[0175] [[BFD / CBD / BFR setting method 2]] The terminal receives a BFD / CBD / BFR configuration that is common to multiple communication points.

[0176] Multiple reference signals (BFD-RS / CBD-RS) corresponding to multiple communication points may be configured (multiple reference signals may be transmitted from multiple communication points, respectively). The terminal may monitor the multiple reference signals and determine beam failure for all of the multiple communication points. If the quality of one or more of the multiple reference signals is equal to or greater than a threshold, the terminal may determine that beam failure has not occurred for all of the multiple communication points. If the quality of all of the multiple reference signals is lower than a threshold, the terminal may determine that beam failure has occurred for all of the multiple communication points.

[0177] When a beam failure is detected, the terminal may perform CBD based on multiple reference signals (CBD-RS) configured for multiple communication points, and may transmit a BFR request to at least one of a specific communication point among the multiple communication points, another communication point, and a communication point on another frequency carrier (a specific communication point or a specific communication point in the communication point group in which the beam failure occurred). The other communication point may be a communication point corresponding to a candidate beam detected by CBD. The specific communication point may be a communication point that transmitted the BFD / CBD / BFR configuration, an upper communication point (e.g., a base station / IAB node) accommodating the communication point group in which the beam failure occurred, or may correspond to a PCell / PSCell.

[0178] [[BFD / CBD / BFR setting method 3]] The terminal receives BFD / CBD / BFR settings common to multiple communication points and determines beam obstructions for each communication point.

[0179] A plurality of reference signals (BFD-RS) corresponding to the plurality of communication points may be set (the plurality of reference signals may be transmitted from the plurality of communication points, respectively). The terminal may monitor the plurality of reference signals and determine beam failure for each communication point.

[0180] When a beam failure for a certain communication point is detected, the terminal may perform CBD for the multiple communication points (including communication points other than the communication point where the beam failure occurred) based on a reference signal (CBD-RS) configured for the multiple communication points including the communication point, and may transmit a BFR request to at least one of the multiple communication points, another communication point, and a communication point on another frequency carrier (a communication point corresponding to the beam failure, a specific communication point, or a specific communication point in the communication point group where the beam failure occurred). The other communication point may be a communication point corresponding to a candidate beam detected by CBD. The specific communication point may be a communication point that transmitted the BFD / CBD / BFR configuration, or may be an upper communication point (e.g., a base station / IAB node) accommodating the communication point group where the beam failure occurred, or may correspond to a PCell / PSCell.

[0181] A first parameter of the BFD / CBD / BFR configuration may be a parameter specific to a communication point. The first parameter may include a BFD / CBD configuration (e.g., a BFD-RS / CBD-RS configuration) corresponding to (sent from) the communication point. A second parameter of the BFD / CBD / BFR configuration may be a parameter common to multiple communication points. The second parameter may include at least one of a timer for BFD and a threshold for CBD.

[0182] [Aspect 2-1-2] Parameters related to BFD / CBD / BFR may be set separately for each communication point or each communication point group. For example, the terminal may receive parameters related to BFD / CBD / BFR of each communication point from the communication point, or may receive parameters related to BFD / CBD / BFR of each communication point from a communication point (upper communication point) accommodating the communication point group.

[0183] The BFD / CBD / BFR-related parameters may be set commonly to multiple communication points or a group of multiple communication points. For example, the terminal may receive BFD / CBD / BFR-related parameters for all or some of the multiple communication points from a specific communication point.

[0184] If a communication point is an upper communication point (e.g., a base station or an IAB node), the terminal may receive parameters related to BFD / CBD / BFR of the communication point from the communication point. If a communication point is a lower communication point (e.g., a terminal or an IAB node), the terminal may receive parameters related to BFD / CBD / BFR of the communication point from an upper communication point accommodating the communication point. The upper communication point may correspond to a PCell / PSCell.

[0185] The terminal may receive parameters related to BFD (e.g., radio link monitoring configuration (RadioLinkMonitoringConfig)) and parameters related to CBD / BFR (e.g., beam failure recovery configuration (BeamFailureRecoveryConfig)) from two (different) communication points, respectively, or from one (same) communication point.

[0186] <<Aspect 2-2>> Actions / Procedures for BFD / CBD / BFR The specifications may specify operations related to BFD / CBD / BFR when a terminal / IAB node is configured with multiple BFD / CBD / BFRs corresponding to multiple communication points on the same frequency carrier. The terminal may comply with at least one of the following aspects 2-2-1 and 2-2-2.

[0187] [Aspect 2-2-1] Different terminal operations may be specified when beam failure occurs in only some of multiple communication points (multiple BFDs, multiple BFD-RSs) and when beam failure occurs in all of the multiple communication points, or a common terminal operation may be specified. Different terminal operations may be specified when beam failure occurs in a specific communication point (specific BFD, specific BFD-RS) among the multiple communication points and when beam failure does not occur, or a common terminal operation may be specified. The specific communication point may be an upper communication point, a communication point that transmitted BFD / CBD / BFR, or may correspond to a PCell / PSCell. The specific communication point may be set by an upper communication point or may be updated based on notifications such as MAC CE or DCI.

[0188] Actions taken in response to beam obstructions may follow any of the following beam obstruction actions 1 to 3.

[0189] [[Beam Obstruction Action 1]] If a beam failure occurs in only some of the multiple communication points, the terminal transmits a BFR request to other communication points (e.g., communication points where no beam failure occurs) among the multiple communication points (within the same frequency carrier).

[0190] [[Beam Obstruction Action 2]] When a beam failure occurs at a specific communication point, the terminal transmits a BFR request to a communication point configured by the specific communication point. The specific communication point may be the communication point that transmitted the BFD / CBD / BFR configuration, an upper communication point (e.g., a base station / IAB node), the communication point that transmitted the BFD / CBD / BFR, or may correspond to a PCell / PSCell.

[0191] Beam Obstruction Action 3 If beam failure occurs at all communication points in that frequency carrier, the terminal may transmit a BFR request to a communication point in another frequency carrier. The other frequency carrier may correspond to a PCell / PSCell. The other frequency carrier may be configured by an upper communication point or updated based on a notification such as a MAC CE or DCI.

[0192] The BFR request may be a PRACH (random access preamble), a MAC CE, a UCI (PUCCH or PUSCH including UCI), or an SRS. The BFR request configuration may include a PRACH configuration (sequence, occasion). The MAC CE may indicate a communication point where a beam failure has occurred. The multiple communication points may correspond to multiple bit positions in a bitmap in the MAC CE, and each bit may indicate whether a beam failure has occurred at the corresponding communication point.

[0193] [Aspect 2-2-2] If beam failure occurs at multiple points among multiple communication points (multiple BFDs, multiple BFD-RSs) on the same frequency carrier, the terminal may send one BFR request for the multiple communication points where beam failure has occurred, or may send multiple BFR requests corresponding to the multiple communication points where beam failure has occurred.

[0194] In the example of Figure 5A, UE#0 communicates with multiple communication points. The multiple communication points are gNB#1, gNB#2, and UE#1. UE#0 performs BFD with each communication point. Thereafter, as in the example of Figure 5B, if UE#0 detects / determines a beam failure in BFD with UE#1, UE#0 may send a BFR request to gNB#2 or perform CBD / BFR with UE#2 to change the communication point from UE#1 to UE#2.

[0195] <<Aspect 2-3>>UE Capabilities The terminal (IAB-MT) may report whether it supports BFD / CBD / BFR for multiple communication points on the same frequency carrier as UE capability.

[0196] Supporting BFD / CBD / BFR for multiple communication points on the same frequency carrier may be a prerequisite for supporting communication with multiple communication points on the same frequency carrier (simultaneous communication).

[0197] The terminal may report whether it supports BFD / CBD / BFR for multiple communication points on the same frequency carrier, independently of the state of FR / frequency band / duplex mode / need for sensing (need for channel access procedure, licensed spectrum or unlicensed (shared) spectrum) / serving cell type (SpCell or SCell).

[0198] A terminal may independently report whether it supports BFD / CBD / BFR (BFD / CBD / BFR configuration) for each communication point and whether it supports BFD / CBD / BFR (BFD / CBD / BFR configuration) common to multiple communication points.

[0199] The terminal may report the number (maximum number) of BFD / CBD / BFR that can be performed simultaneously on the same frequency carrier, and the number (maximum number) of BFD / CBD / BFR that can be performed simultaneously on all frequency carriers.

[0200] At least one of the values ​​(range, granularity) that can be reported as UE capabilities and the values ​​(range, granularity) that can be set as parameters related to BFD / CBD / BFR may differ depending on the FR / frequency band / terminal type (e.g., UE or IAB-MT). For example, the number of BFD / CBD / BFR that can be simultaneously performed on frequency carriers in a first frequency range (e.g., FR1) may be fewer than the number of BFD / CBD / BFR that can be simultaneously performed on frequency carriers in a second frequency range (a frequency range higher than the first frequency range, e.g., FR2). For example, the number of BFD / CBD / BFR that a UE can simultaneously perform on one frequency carrier may be fewer than the number of BFD / CBD / BFR that an IAB-MT can simultaneously perform on one frequency carrier.

[0201] According to this embodiment, beam failures at multiple communication points can be detected / recovered, thereby improving communication reliability.

[0202] <Other embodiments> An upper layer parameter (RRC IE) / UE capability corresponding to a function (feature) in at least one of the above embodiments may be defined. The UE capability may indicate that the function is supported.

[0203] A UE configured with higher layer parameters corresponding to the function (enabling the function) may perform the function. It may also be specified that "a UE not configured with higher layer parameters corresponding to the function shall not perform the function (for example, in accordance with Rel. 15 / 16)."

[0204] A UE that reports a UE capability indicating that it supports the function may perform the function. It may also be specified that "a UE that does not report a UE capability indicating that it supports the function shall not perform the function (e.g., in accordance with Rel. 15 / 16)."

[0205] If the UE reports a UE capability indicating that it supports the function and the corresponding upper layer parameter is configured, the UE may perform the function. It may also be specified that "if the UE does not report a UE capability indicating that it supports the function or if the corresponding upper layer parameter is not configured, the UE shall not perform the function (e.g., in accordance with Rel. 15 / 16)."

[0206] The UE capability may indicate whether the UE supports this feature.

[0207] (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.

[0208] 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).

[0209] 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.

[0210] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0211] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0212] 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.

[0213] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0214] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be a frequency band higher than FR2.

[0215] 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.

[0216] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0217] 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.

[0218] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0219] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0220] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0221] 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.

[0222] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0223] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0224] 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.

[0225] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0226] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0227] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0228] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0229] 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.

[0230] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted as DL-RS.

[0231] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as reference signals.

[0232] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0233] (base station) 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.

[0234] 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.

[0235] 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.

[0236] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0237] 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.

[0238] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0239] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0240] 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.

[0241] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0242] 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.

[0243] The transceiver 120 (transmission processor 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0244] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0245] 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 .

[0246] 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.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] The transceiver 120 may transmit to a terminal that communicates with multiple communication points on the same carrier, settings (e.g., RLM settings) for radio link monitoring for one or more of the multiple communication points.

[0251] The control unit 110 may control transmission of a reference signal (for example, RLM-RS) on the carrier based on the setting.

[0252] The transceiver unit 120 may transmit to a terminal that communicates with multiple communication points on the same carrier, settings (e.g., BFD / CBD / BFR settings) for beam failure detection for one or more of the multiple communication points.

[0253] The control unit 110 may control the transmission of a reference signal (for example, BFD-RS / CBD-RS) on the carrier based on the setting.

[0254] (user terminal) 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 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0255] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0256] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0257] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.

[0258] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured from a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0259] 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.

[0260] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0261] 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.

[0262] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0263] The transceiver 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0264] The transceiver 220 (transmission processor 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0265] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0266] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0267] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0268] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0269] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0270] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0271] The transceiver 220 may receive one or more configurations for radio link monitoring (eg, RLM configurations).

[0272] Based on the one or more settings, the control unit 210 may monitor a plurality of reference signals (for example, RLM-RS) corresponding to a plurality of communication points, respectively, on the same carrier.

[0273] The one or more settings may include at least one of a plurality of settings respectively corresponding to the plurality of communication points, and one setting common to the plurality of communication points.

[0274] The transceiver 220 may receive the one or more configurations from the plurality of communication points or from one communication point.

[0275] When a radio link failure occurs at at least one of the plurality of communication points, the control unit 210 may perform at least one of reporting the radio link failure and initiating communication to another communication point or another carrier.

[0276] The transceiver 220 may receive one or more settings for beam obstruction detection (e.g., BFD / CBD / BFR settings).

[0277] Based on the one or more settings, the control unit 210 may monitor a plurality of reference signals (for example, BFD-RS / CBD-RS) corresponding to a plurality of communication points, respectively, on the same carrier.

[0278] The one or more settings may include at least one of a plurality of settings respectively corresponding to the plurality of communication points, and one setting common to the plurality of communication points.

[0279] The receiver may receive the one or more settings from the plurality of communication points or from one communication point.

[0280] When a beam failure occurs in at least one of the plurality of communication points, the control unit may perform the beam failure recovery.

[0281] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or the multiple devices with software.

[0282] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As mentioned above, the implementation method of each is not particularly limited.

[0283] 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 showing 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.

[0284] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0285] 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.

[0286] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0287] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0288] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0289] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0290] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0291] 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.

[0292] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0293] 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.

[0294] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0295] (Variation) Note that terms explained in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0296] 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.

[0297] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0298] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0299] 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.

[0300] 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.

[0301] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0302] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0303] 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.

[0304] 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.

[0305] 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.

[0306] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0307] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0308] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0309] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0310] 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.

[0311] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0312] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0313] 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."

[0314] 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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.

[0320] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0321] Note that the physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be called 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).

[0322] 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).

[0323] 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).

[0324] 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.

[0325] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0326] 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).

[0327] 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.

[0328] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0329] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0330] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0331] 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.

[0332] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the mobile body itself. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0333] 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 uplink channel and downlink channel may be read as sidelink channel.

[0334] 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.

[0335] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0336] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the specific order presented.

[0337] Each aspect / embodiment described in the present disclosure may be related to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use 802.20, Ultra-Wide Band (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on and extend these systems. Furthermore, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0338] 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."

[0339] 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.

[0340] 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.

[0341] 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.

[0342] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0343] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0344] 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.

[0345] 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."

[0346] 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.

[0347] 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."

[0348] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0349] 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.

[0350] 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 for receiving one or more settings for beam obstruction detection; a control unit that monitors a plurality of reference signals corresponding to a plurality of communication points on the same carrier based on the one or more settings; The one or more settings include one setting common to the plurality of communication points.

2. The terminal according to claim 1 , wherein the receiving unit receives the one or more settings from the plurality of communication points or one communication point.

3. The terminal according to claim 1 or 2, wherein the control unit performs beam failure recovery (BFR) when a beam failure occurs in at least one of the plurality of communication points.

4. The terminal described in claim 3, wherein the BFR includes at least one of sending a BFR request to one of the multiple communication points set by the communication point where the beam failure occurred, and sending a BFR request to a communication point in a different carrier when beam failure occurs at all of the multiple communication points in the same carrier.

5. When the quality of one or more of the plurality of reference signals is equal to or greater than a threshold, the control unit determines that no beam failure has occurred for all of the plurality of communication points; The terminal according to claim 1 , wherein when the qualities of all of the plurality of reference signals are lower than a threshold, the control unit determines that a beam failure has occurred for all of the plurality of communication points.

6. receiving one or more configurations for beam fault detection; monitoring a plurality of reference signals corresponding to a plurality of communication points on the same carrier based on the one or more settings; A wireless communication method for a terminal, wherein the one or more settings include one setting common to the plurality of communication points.

7. a transmitter that transmits one or more settings for beam obstruction detection to a terminal that communicates with a plurality of communication points on the same carrier; a control unit that controls transmission of a plurality of reference signals corresponding to each of the plurality of communication points within the carrier based on the one or more settings, A base station, wherein the one or more settings include one setting common to the plurality of communication points.

8. A system having a terminal and a base station, The terminal a receiver for receiving one or more settings for beam obstruction detection; a control unit that monitors a plurality of reference signals corresponding to a plurality of communication points on the same carrier based on the one or more settings; The base station a transmitter for transmitting the one or more settings; The one or more settings include one setting common to the plurality of communication points.

Images