Terminals, wireless communication methods, base stations and systems

Abstract

The present invention properly detects beam failure. A terminal according to one embodiment of the present disclosure has: a control unit that, if a set of reference signal (RS) indices, which correspond to a resource for beam failure detection (BFD), is not established by higher layer signaling and a specific parameter is established, follows a specific rule to select up to a prescribed number of control resource sets (COntrol REsource SET (CORESET)) for deciding the RS indices to be included in the set; and a reception unit for evaluating wireless link quality on the basis of the RS corresponding to the RS indices.

Description

Technical Field

[0001] This disclosure relates to a terminal, a wireless communication method, a base station in a next-generation mobile communication system. 、 Base station and system and is concerned with.

Background Art

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

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

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

[0005] Future wireless communication systems (e.g., NR) are considering implementing procedures to detect beam failures and switch to other beams (sometimes called Beam Failure Recovery (BFR) procedures, or simply BFR).

[0006] For beam fault detection (BFR), the UE uses a configured reference signal resource to detect beam faults. However, if the resource is not configured, the UE is considering using up to two reference signal indices corresponding to the Transmission Configuration Indication (TCI-state) of the Control Resource Set (CORESET) as the set of indices corresponding to that resource.

[0007] Therefore, if the above resources are not configured for a UE, and more than two CORESETs are configured, the UE must determine up to two indexes to include in the above set from the more than two indexes corresponding to these CORESETs.

[0008] However, there has been little consideration given to how to select the indices to include in the above set in such cases. Without a clear definition of this, beam faults may not be detected properly, potentially leading to a decrease in communication throughput.

[0009] Therefore, this disclosure provides a terminal capable of appropriately detecting beam obstructions and a wireless communication method. 、 base station and system One of the objectives is to provide [this]. [Means for solving the problem]

[0010] A terminal relating to one aspect of this disclosure is A receiving unit that receives a Control Resource Set (CORESET) pool index of value 0 and a CORESET pool index of value 1 different from the value 0, based on upper layer parameters, and for PCell, PSCell, and SCell beam faults Beam Failure Detection (BFD) - Reference Signal (RS) In this, the set of RS resource indexes for BFD corresponding to the CORESET pool index of value 0 and the set of RS resource indexes for BFD corresponding to the CORESET pool index of value 1 are BFD resource settings Set by If none exists, the RS provided for the active transmit configuration instruction (TCI) state for downlink control channel (PDCCH) reception at the maximum CORESET ID among the multiple CORESETs corresponding to the CORESET pool index of value 0 is determined to be the set of RS resource indexes for the BFD corresponding to the CORESET pool index of value 0, and the RS provided for the active TCI state for PDCCH reception at the maximum CORESET ID among the multiple CORESETs corresponding to the CORESET pool index of value 1 is determined to be the set of RS resource indexes for the BFD corresponding to the CORESET pool index of value 1. Control unit and The number of BFD-RS having and being limited by terminal capability information is the number of CORESET pool indexes for the value of 0 and the value of 1. . [Effects of the Invention]

[0011] According to one aspect of this disclosure, beam faults can be appropriately detected. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 shows an example of the beam fault recovery procedure at Rel.15 NR. [Figure 2] Figure 2 shows an example of a schematic configuration of a wireless communication system according to one embodiment. [Figure 3] Figure 3 shows an example of the configuration of a base station according to one embodiment. [Figure 4] Figure 4 shows an example of the configuration of a user terminal according to one embodiment. [Figure 5] Figure 5 shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. [Modes for carrying out the invention]

[0013] (TCI, spatial relations, QCL) In NR, it is being considered to control the receive processing (e.g., at least one of receive, demapping, demodulation, and decoding) and transmit processing (e.g., transmit, mapping, precoding, modulation, and encoding) of at least one of the signal and channel (referred to as signal / channel) at the UE based on the Transmission Configuration Indication state (TCI state).

[0014] The TCI state may represent what is applied to the downlink signal / channel. What corresponds to the TCI state applied to the uplink signal / channel may be expressed as a spatial relation.

[0015] The TCI state is information regarding the Quasi-Co-Location (QCL) of a signal / channel, and may be referred to as a spatial reception parameter, Spatial Relation Information, etc. The TCI state may be set for each UE per channel or per signal.

[0016] QCL is an indicator showing the statistical properties of a signal / channel. For example, when a certain signal / channel and another signal / channel are in a QCL relationship, it may mean that at least one of Doppler shift, Doppler spread, average delay, delay spread, spatial parameter (for example, spatial Rx parameter) is the same (QCL for at least one of these) among these different multiple signals / channels.

[0017] Note that the spatial reception parameter may correspond to the reception beam of the UE (for example, the reception analog beam), and the beam may be specified based on spatial QCL. QCL (or at least one element of QCL) in the present disclosure may be read as sQCL (spatial QCL).

[0018] Multiple types (QCL types) of QCL may be defined. For example, four QCL types A - D may be provided in which the parameters (or parameter sets) that can be assumed to be the same are different, and the parameters (which may also be referred to as QCL parameters) are shown below: • QCL Type A (QCL-A): Doppler shift, Doppler spread, mean delay, and delay spread. • QCL Type B (QCL-B): Doppler shift and Doppler spread, • QCL Type C (QCL-C): Doppler shift and mean delay, • QCL Type D (QCL-D): Spatial reception parameters.

[0019] The assumption by the UE that one control resource set (CORESET), channel, or reference signal is in a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be called a QCL assumption.

[0020] The UE may determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of a signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0021] The TCI state may, for example, be information regarding the QCL between the target channel (in other words, the reference signal (RS) for that channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by upper-layer signaling, physical layer signaling, or a combination thereof.

[0022] In this disclosure, the higher-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0023] MAC signaling may use, for example, MAC Control Elements (MAC CEs) or MAC Protocol Data Units (PDUs). Broadcast information may also include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), or Other System Information (OSIs).

[0024] Physical layer signaling may include, for example, Downlink Control Information (DCI).

[0025] The channel / signal to which the TCI status applies may also be called the target channel / reference signal (target channel / RS), or simply the target, while the other signal mentioned above may be called the reference signal (reference RS), source RS, or simply the reference.

[0026] The channel on which the TCI state or spatial relationship is set (specified) may be, for example, at least one of the following: Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), Physical Uplink Shared Channel (PUSCH), or Physical Uplink Control Channel (PUCCH).

[0027] Furthermore, the RS that has a QCL relationship with the channel may be at least one of the following: a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), a Tracking CSI-RS (also called a Tracking Reference Signal (TRS)), a QCL detection reference signal (also called a QRS), or a Demodulation Reference Signal (DMRS)).

[0028] An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may also be called an SS / PBCH block.

[0029] The RS of a QCL type X in a TCI state may also mean the RS in the relationship between a channel / signal (or its DMRS) and a QCL type X, and this RS may also be called the QCL source of the QCL type X in that TCI state.

[0030] (BFR) In NR (Non-Radio Frequency) communication, beamforming is being considered. Furthermore, to suppress the occurrence of Radio Link Failure (RLF), procedures are being considered to implement switching to other beams (sometimes called Beam Recovery (BR), Beam Failure Recovery (BFR), or L1 / L2 (Layer 1 / Layer 2) beam recovery) when the quality of a particular beam deteriorates. The BFR procedure may also be simply referred to as BFR.

[0031] In this disclosure, beam failure may also be referred to as link failure.

[0032] Figure 1 shows an example of the beam fault recovery procedure at Rel.15 NR. The number of beams and other details are examples only and are not limited to this.

[0033] In the initial state shown in Figure 1 (step S101), the UE performs measurements based on the RS resources transmitted using two beams. These RS resources may be at least one of the SSB and CSI-RS. The RS measured in step S101 may be called the Beam Failure Detection RS (BFD-RS). Beam failure detection may simply be called failure detection.

[0034] In step S102, the UE is unable to detect the BFD-RS (or the quality of the RS reception is degraded) due to interference with the radio waves from the base station. Such interference can occur, for example, due to obstacles, fading, or interference between the UE and the base station.

[0035] The UE detects a beam fault when certain conditions are met. For example, the UE may detect a beam fault if the BLER (Block Error Rate) is below a threshold for all configured BFD-RS. When a beam fault is detected, the lower layer of the UE (physical (PHY) layer) may notify (instruct) the upper layer (MAC layer) of the beam fault instance.

[0036] Furthermore, the criteria for judgment are not limited to BLER, but may also be Layer 1 Reference Signal Received Power (L1-RSRP). In this disclosure, RSRP may be interpreted as RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio), or other power or quality information.

[0037] Alternatively, beam fault detection may be performed based on PDCCH or similar methods, either in place of or in addition to RS measurement. BFD-RS may be expected to be the DMRS and QCL of the PDCCH monitored by the UE.

[0038] Information regarding BFD-RS (e.g., RS index, resources, number, number of ports, precoding, etc.) and information regarding beam fault detection (BFD) (e.g., the thresholds mentioned above) may be set (notified) to the UE using higher-layer signaling or the like. Information regarding BFD-RS may be interchangeable with information regarding BFD resources and information regarding BFD-RS resources.

[0039] The UE's MAC layer may start a predetermined timer (which may be called a beam failure detection timer) when it receives a beam failure instance notification from the UE's PHY layer. If the UE's MAC layer receives a certain number of beam failure instance notifications (for example, "beamFailureInstanceMaxCount" set in the RRC) before the timer expires, it may trigger a BFR (for example, by initiating one of the random access procedures described below).

[0040] The base station may determine that the UE has detected a beam fault if it does not receive notification from the UE, or if it receives a predetermined signal from the UE (a beam recovery request in step S104).

[0041] In step S103, the UE begins searching for a new candidate beam to be used for communication in order to recover the beam. The UE may select a new candidate beam corresponding to a predetermined RS by measuring that RS. The RS measured in step S103 may be called the New Candidate Beam Identification RS (NCBI-RS), CBI-RS, CB-RS (Candidate Beam RS), etc. NCBI-RS may be the same as or different from BFD-RS. The new candidate beam may also be simply called a candidate beam or new beam.

[0042] The UE may determine a beam corresponding to an RS that meets predetermined conditions as a new candidate beam. For example, the UE may determine a new candidate beam based on an RS among the set NCBI-RSs where the L1-RSRP exceeds a threshold. Note that the criteria for judgment are not limited to the L1-RSRP. The L1-RSRP for SSB may be called SS-RSRP. The L1-RSRP for CSI-RS may be called CSI-RSRP.

[0043] Information regarding NCBI-RS (e.g., RS resources, number, number of ports, precoding, etc.) and information regarding New Candidate Beam Identification (NCBI) (e.g., the thresholds mentioned above) may be set (notified) to the UE using higher-layer signaling or the like. Information regarding NCBI-RS may be obtained based on information regarding BFD-RS. Information regarding NCBI-RS may also be referred to as information regarding NBCI resources.

[0044] Note that BFD-RS, NCBI-RS, etc., may be interpreted as Radio Link Monitoring RS (RLM-RS).

[0045] In step S104, the UE that identified the new candidate beam sends a Beam Failure Recovery reQuest (BFRQ). The Beam Failure Recovery reQuest may also be called a Beam Failure Recovery request signal or Beam Failure Recovery request signal.

[0046] A BFRQ may be sent using, for example, at least one of PUCCH, PRACH, PUSCH, or configured grant PUSCH. A UE may send a preamble (also known as an RA preamble, PRACH, etc.) as a BFRQ using the PRACH resource.

[0047] Information regarding the correspondence between the detected DL-RS (beam) and the PRACH resource (RA preamble) may be set in the UE by, for example, higher-layer signaling (such as RRC signaling).

[0048] The BFRQ may include information on the new candidate beam identified in step S103. Resources for the BFRQ may be associated with the new candidate beam. Beam information may be communicated using a beam index (BI), a port index of a given reference signal, a resource index (e.g., CSI-RS resource indicator (CRI), SSB resource indicator (SSBRI)), etc.

[0049] In step S105, the base station that detected the BFRQ transmits a response signal to the BFRQ from the UE (which may also be called a gNB response). This response signal may include reconfiguration information for one or more beams (e.g., configuration information for DL-RS resources). Based on the beam reconfiguration information, the UE may determine which of the transmit and receive beams to use.

[0050] The response signal may be transmitted, for example, in the UE common search space of the PDCCH. The response signal may be announced using a DCI (PDCCH) with a Cyclic Redundancy Check (CRC) scrambled by the UE identifier (e.g., Cell-Radio RNTI (C-RNTI)). The UE may determine that contention resolution has been successful when it receives a PDCCH corresponding to its own C-RNTI.

[0051] The UE may monitor the response signal based on at least one of the CORESET for BFR and the Search Space Set for BFR.

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

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

[0054] A successful beam recovery (BR success) may indicate, for example, that the process reaches step S106. On the other hand, a failed beam recovery (BR failure) may correspond to, for example, that the number of BFRQ transmissions reaches a predetermined number, or that the beam-failure-recovery-Timer expires.

[0055] Note that the numbers in these steps are for illustrative purposes only, and multiple steps may be grouped together, or their order may be changed. Also, whether or not to perform BFR may be set in the UE using higher-layer signaling.

[0056] Incidentally, in Rel.15 / 16 NR, a base station can configure up to two BFD resources per BWP for the UE using upper-layer signaling. For example, the UE may provide resources related to the purpose of beam failure in the fault detection resource configuration information (e.g., upper-layer parameters such as "failureDetectionResourcesToAddModList" and "failureDetectionResources"; hereinafter referred to as "failureDetectionResources").

[0057] For example, for each BWP in a serving cell, the UE may be provided with a set of periodic(P)-CSI-RS resource configuration indices (e.g., non-zero power CSI-RS resource IDs) by fault detection resource configuration information. This set may also be called the set q0 bar (where q0 bar is written with an overline on "q0"), the index set, etc. Hereafter, this set will simply be referred to as "set q0".

[0058] The set of P-CSI-RS resources q0 explicitly provided by the fault detection resource configuration information may also be called explicit BFD-RS, explicit BFD-RS resources, etc.

[0059] The UE may perform at least one of the following based on the RS resources corresponding to the index included in set q0: radio link quality assessment, channel measurement, L1-RSRP measurement, etc., to detect beam faults.

[0060] For example, the physical layer within the UE has a threshold Q. out,LRThe wireless link quality is evaluated according to resource setting set q0. For set q0, the UE may evaluate the wireless link quality according to a quasi-co-located (QCLed) P-CSI-RS resource setting that is quasi-co-located with the DM-RS of the PDCCH reception monitored by the UE, or an SS / PBCH block on a PCell or PSCell that is quasi-co-located with the DM-RS of the PDCCH reception monitored by the UE.

[0061] In other words, whether it is explicit or implicit BFD-RS, BFD-RS may be linked to PDCCH and QCL.

[0062] In this disclosure, providing the above-mentioned upper-layer parameters (resource configuration information for fault detection) that indicate information on the index corresponding to the BFD resource may be interpreted as configuring the BFD resource, configuring BFD-RS, etc. In this disclosure, the BFD resource, the periodic CSI-RS resource configuration index or SSB index set q0, BFD-RS, etc. may be interpreted as being interchangeable.

[0063] On the other hand, Rel.15 / 16 NR stipulates that if no resources for BFD are configured, the UE shall decide to include in set q0 an index for the configuration of a periodic CSI-RS resource, which is the same value as the RS index in the RS set indicated by the TCI state of the CORESET used to monitor PDCCH.

[0064] For example, if a UE does not provide set q0 for one of the BWPs of a serving cell via failure detection resource configuration information (failureDetectionResources), the UE decides to include in set q0 a P-CSI-RS resource configuration index that has the same value as the RS index in the RS set indicated by the TCI state ("TCI-State") for the corresponding CORESET used for monitoring the PDCCH.

[0065] The set q0 determined when no BFD resources are configured may be called implicit BFD-RS, implicit BFD-RS resources, etc. In this disclosure, implicit BFD-RS may mean the BFR-RS determined by the UE for a BWP of a serving cell for which set q0 is not provided by the fault detection resource configuration information. In this disclosure, the fact that the UE is not provided with set q0 by the fault detection resource configuration information may be interpreted as the fact that set q0 is not provided by the fault detection resource configuration information for a certain BWP of a certain serving cell, and that no BFD resources are configured for that BWP of that serving cell, etc.

[0066] If a single TCI state has two RS indices, set q0 includes the RS indices for which QCL type D is set for the corresponding TCI state. The UE expects set q0 to contain up to two RS indices. The UE assumes a single port RS within set q0.

[0067] (Multi-TRP) In NR, it is being considered that one or more transmission / reception points (TRPs) (multi-TRPs (MTRPs)) will perform DL transmissions to the UE. It is also being considered that the UE will perform UL transmissions to one or more TRPs.

[0068] A UE may assume that if, in the active downlink Bandwidth Part (BWP) of a serving cell, a CORESET pool index (upper layer parameter CORESETPoolIndex) is not provided for one or more first CORESETs, or a CORESET pool index value of 0 is provided, and a CORESET pool index value of 1 is provided for one or more second CORESETs, then Multi-DCI based Multi-TRP will be used (or controlled based on it).

[0069] As described above, if more than two CORESETs are configured for a UE, and set q0 is not provided by the fault detection resource configuration information, the UE needs to determine up to two indices to include in set q0 from the more than two RS indices corresponding to these CORESETs. There are cases where more than two (for example, three) CORESETs are configured for a UE per BWP. For example, in cases where Multi-DCI based Multi-TRP is used, a total of five CORESETs may be configured.

[0070] However, there has been little consideration given to how to select the indices to include in set q0 in such cases. If set q0 is not provided by the fault detection resource configuration information, the previous Rel.15 / 16 specifications stipulate that up to two BFD-RS will be selected based on the CORESET TCI state, but there is no specification on how this selection is made, leaving it up to the UE implementation. If the method for selecting BFD-RS is not clearly defined, beam faults may not be detected properly, which could lead to a decrease in communication throughput.

[0071] Therefore, the inventors devised a method for determining a reference signal index for appropriately detecting beam faults.

[0072] The embodiments of this disclosure will be described in detail below with reference to the drawings. Each wireless communication method according to the embodiments may be applied individually or in combination.

[0073] In this disclosure, "A / B" may mean "at least one of A and B."

[0074] In this disclosure, the terms activate, deactivate, indicate, select, configure, update, determine, etc., may be interpreted interchangeably.

[0075] In this disclosure, RRC, RRC parameters, RRC messages, upper layer parameters, information elements (IE), and settings may be interpreted interchangeably. In this disclosure, MAC CE, update commands, and activation / deactivation commands may be interpreted interchangeably. In this disclosure, support, control, controllable, operate, and operable may be interpreted interchangeably.

[0076] Furthermore, in this disclosure, sequences, lists, sets, groups, and the like may be interpreted interchangeably.

[0077] In this disclosure, panels, beams, panel groups, beam groups, Uplink (UL) transmit entities, TRPs, spatial relation information (SRI), spatial relations, control resource sets (CORESET), Physical Downlink Shared Channel (PDSCH), codewords, base stations, predetermined antenna ports (e.g., Demodulation Reference Signal (DMRS) ports), predetermined antenna port groups (e.g., DMRS port groups), predetermined groups (e.g., Code Division Multiplexing (CDM) groups, predetermined reference signal groups, CORESET groups), predetermined resources (e.g., predetermined reference signal resources), predetermined resource sets (e.g., predetermined reference signal resource sets), CORESET pools, PUCCH groups (PUCCH resource groups), spatial relation groups, downlink TCI states (DL TCI states), uplink TCI states (UL TCI states), unified TCI states, etc., may be interpreted interchangeably.

[0078] The panel may be associated with at least one of the following: a group index for SSB / CSI-RS groups, a group index for group-based beam reporting, or a group index for SSB / CSI-RS groups for group-based beam reporting.

[0079] Furthermore, the panel identifier (ID) and the panel may be interchangeable. In other words, TRP ID and TRP, CORESET group ID and CORESET group, etc., may be interchangeable.

[0080] In this disclosure, terms such as index, identifier (ID), indicator, and resource ID may be interpreted interchangeably. In this disclosure, terms such as sequence, list, set, group, cluster, and subset may be interpreted interchangeably.

[0081] In this disclosure, a single PDCCH may be assumed to be supported when multiple TRPs utilize an ideal backhaul. Multiple PDCCHs may also be assumed to be supported when multiple TRPs utilize a non-ideal backhaul.

[0082] The ideal backhaul may also be called DMRS port group type 1, reference signal-related group type 1, antenna port group type 1, CORESET pool type 1, etc. The non-ideal backhaul may also be called DMRS port group type 2, reference signal-related group type 2, antenna port group type 2, CORESET pool type 2, etc. The names are not limited to these.

[0083] In this disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be interpreted as mutually exclusive.

[0084] In this disclosure, single DCI (sDCI), single PDCCH, multi-TRP system based on single DCI, sDCI-based MTRP, and activation of two TCI states on at least one TCI code point may be interpreted as mutually exclusive.

[0085] In this disclosure, the terms "multi-DCI (mDCI)," "multi-PDCCH," "multi-TRP system based on multi-DCI," "mDCI-based MTRP," "two CORESET pool indices," or "CORESET pool index = 1 (or a value of 1 or more)" may be interpreted interchangeably.

[0086] In this disclosure, "first TRP," "TRP1," "first CORESET," and "CORESET for which no CORESET pool index is provided or for which a CORESET pool index value of 0 is provided" may be interpreted as interchangeable. Also, "first CORESET" may mean one or more first CORESETs.

[0087] In this disclosure, “second TRP,” “TRP2,” “second CORESET,” and “CORESET for which a CORESET pool index value = 1” may be interpreted as mutually exclusive. Also, “second CORESET” may mean one or more second CORESETs.

[0088] In the following embodiments, we will assume, but will not be limited to, that there are up to two implicit BFD-RSs. The term "two" in this disclosure may be interpreted as "more than two" (for example, three or more). Furthermore, the following embodiments may or may not be limited to the case of multiple TRPs.

[0089] (Wireless communication method) <First Embodiment> The first embodiment relates to the determination of implicit BFD-RS.

[0090] In the first embodiment, if a set q0 is not provided by failure detection resource configuration information (failureDetectionResources) for a BWP of a serving cell, the UE may determine the CSI-RS provided for the active TCI state for PDCCH reception in the CORESET associated with the search space set, in order of the search space sets from the shortest monitoring period, as the CSI-RS for set q0. The UE may also determine to include the index of the determined CSI-RS in set q0.

[0091] Furthermore, if more than one CORESET is associated with multiple search space sets having the same monitoring period, the UE may determine the above CSI-RS in order of the CORESETs from the highest CORESET index.

[0092] In other words, the UE may select (determine) two CORESETs from among the CORESETs with active TCI states for implicit BFD-RS, prioritizing first the small monitoring period of the corresponding search space set, and second the size of the CORESET ID, and decide to include the RS index identified based on each CORESET in set q0. The UE may, for example, include the RS index provided by the active TCI state of each CORESET in set q0.

[0093] [Modified version of the first embodiment] If the UE does not provide set q0 for a BWP in a serving cell by the fault detection resource configuration information, it may select two CORESETs from the configured CORESETs that satisfy one or a combination of the following rules, and decide to include the RS index identified based on each CORESET in set q0: • CORESET with TCI status set / not set. • CORESETs that have / do not have an active TCI state. • CORESETs that belong to / do not belong to a specific CORESET pool index (e.g., CORESET pool index = 0, 1), • CORESET, which has the maximum / minimum monitoring period for the associated search space set. • CORESETs with the highest / lowest CORESET IDs, • CORESET, where the period of CSI-RS (reference RS) corresponding to the TCI state is maximum / minimum. • CORESETs are those whose associated search space sets are specific search space sets (e.g., common search space sets, UE-specific search space sets). • CORESET (monitored by) the latest monitoring slot, • A CORESET that corresponds to the first CORESET / second CORESET.

[0094] The priority of these rules may be arbitrary (these rules may be applied in any order to determine the CORESET). For example, if there are multiple CORESETs that satisfy a certain rule, the UE may select one or more CORESETs from these based on another rule.

[0095] In this disclosure, "smallest" may be interpreted as "largest," "best," "lowest," "of a specific value," "the i-th (where i is an integer, e.g., 1, 2, ...)," "from smallest to largest," "from largest to smallest," "the two smallest," "the two largest," etc. In this disclosure, "small" and "large" may be interpreted as mutually exclusive.

[0096] For example, if a UE is not provided with set q0 by fault detection resource configuration information for a BWP in a serving cell, the UE may determine the CSI-RS provided for the active TCI state for PDCCH reception in the CORESET of the smallest CORESET ID in the most recent monitoring slot as the CSI-RS for set q0.

[0097] Furthermore, if a UE is not provided with set q0 by fault detection resource configuration information for a BWP in a serving cell, the UE may determine the CSI-RS provided for the active TCI state for PDCCH reception in the CORESET of the lowest CORESET ID as the CSI-RS for set q0.

[0098] In selecting the CORESET described above, for example, prioritizing a smaller CORESET ID allows for the optimal implementation of BFD for CORESET#0, which is considered the most important.

[0099] Prioritizing the length of the monitoring period allows for the effective detection of long-period PDCCH failures, which are often difficult to detect. Conversely, prioritizing the length of the monitoring period allows for the effective detection of PDCCH failures suitable for low-latency applications.

[0100] Prioritizing the size of the CSI-RS period allows for suitable BFD (Biochemical Fluid Deposition) of PDCCH, which is considered to be of relatively poor quality. On the other hand, prioritizing the small size of the CSI-RS period allows for suitable and more accurate (highly reliable) BFD.

[0101] Prioritizing the CORESET corresponding to the common search space set allows for the suitability of BFD for PDCCHs that are generally considered more important. On the other hand, prioritizing the CORESET corresponding to the UE-specific search space set allows for the suitability of BFD for PDCCHs that are important for scheduling, such as PDSCH and PUSCH, which include TCI status indicator MAC CE.

[0102] Furthermore, the implicit BFD-RS may be determined for each CORESET pool index. In other words, the UE may select two CORESETs from the first CORESET based on one or a combination of the above rules to determine the implicit BFD-RS corresponding to CORESET pool index = 0, and decide to include the RS index identified based on each CORESET in set q0 for CORESET pool index = 0. Alternatively, the UE may select two CORESETs from the second CORESET based on one or a combination of the above rules to determine the implicit BFD-RS corresponding to CORESET pool index = 1, and decide to include the RS index identified based on each CORESET in set q0 for CORESET pool index = 1.

[0103] Regarding the limitation on the number of BFD-RS (maximum of 2 in Rel.15; further limited in Rel.16 by UE capability information described in the second embodiment (e.g., maxTotalResourcesForOneFreqRange-r16)), the UE may assume that the limited number of BFD-RS is the number per CORESET pool index, or the total number for all CORESET pool indexes.

[0104] The implicit BFD-RS may be determined from the CORESET with CORESET ID=0 (CORESET#0), or from the CORESET excluding CORESET#0.

[0105] Furthermore, regarding the RS index included in set q0, the RS may be any RS (e.g., SSB / CSI-RS / TRS) or it may be limited to a specific RS (e.g., it may be limited to CSI-RS / TRS). In other words, the CSI-RS in this disclosure may be interpreted as at least one of the such any RS or the specific RS.

[0106] Furthermore, if two TCI state RSs are set for a CORESET corresponding to a certain CORESET ID (for example, an RS for QCL type D and an RS for QCL type A), the UE may include the index of one RS (for example, the RS for QCL type D) in set q0, or it may include the indexes of both RSs in set q0.

[0107] According to the first embodiment described above, if BFD resources are not configured, BFD-RS can be determined based on an appropriate CORESET. If link failures are handled the same way in RLM and BFR, link recovery can be made redundant using the same CORESET. If link failures are handled differently in RLM and BFR, link failures not covered by RLM can be covered by BFR.

[0108] <Second Embodiment> The second embodiment relates to the conditions under which the implicit BFD-RS determination in the first embodiment described above is applied.

[0109] The UE may perform the determination of the implicit BFD-RS in the first embodiment if any one or more of the following conditions are met (the implicit BFD-RS may be determined based on the determination method of the first embodiment): • Specific parameters are set by upper-layer signaling. • Report specific UE capability information (or support the UE capability corresponding to that information), • The BFD-RS in question is used for BFR for PCell / PSCell. • This BFD-RS is used for BFR for SCell.

[0110] If the above-mentioned specific parameters are not set, the UE may determine the implicit BFD-RS not according to the first embodiment, but for example, according to Rel. 15. The above-mentioned specific parameters may include information for setting a CORESET with a CORESET pool index of 1, information related to multi-TRP, information for setting the method for determining the BFR-RS, and any RRC parameters for a particular release (e.g., Rel. 16, Rel. 17).

[0111] For example, information for setting the method for determining BFR-RS may correspond to information indicating that the method for determining BFR-RS shown in the first embodiment is enabled (information indicating a value of "enable"; may also be called an enabler).

[0112] The specific parameters mentioned above may be set in, for example, beam failure recovery configuration information, for example, in beam failure recovery configuration information for special cells (SpCell, including primary cells (PCell) and primary secondary cells (PSCell)) (e.g., BeamFailureRecoveryConfig), or in beam failure recovery configuration information for secondary cells (SCell) (e.g., BeamFailureRecoverySCellConfig).

[0113] The above specific UE capability information may also be UE capability information for a specific release (e.g., Rel.16, Rel.17). For example, the above specific UE capability information may be at least one of the following: • Information indicating whether the UE supports multiDCI-based multiTRP (e.g., multiDCI-MultiTRP-r16), • Information indicating the maximum number of CORESETs that can be set for each BWP per cell (e.g., maxNumberCORESET-r16), • Information indicating the maximum number of CORESETs that can be set per cell, per BWP, and per CORESET pool index (e.g., maxNumberCORESETPerPoolIndex-r16), • Information indicating the maximum total number of SSB / CSI-RS / CSI-IM resources supported by the UE for beam management, path loss measurement, BFD, RLM, new beam identification, etc. within a single frequency range (e.g., maxTotalResourcesForOneFreqRange-r16). • Information indicating the maximum total number of SSB / CSI-RS / CSI-IM resources (e.g., maxNumberResWithinSlotAcrossCC-OneFR-r16) set up for measurements such as L1-RSRP, L1-SINR, path loss, BFD, RLM, and new beam identification within a single slot across all CCs in a single frequency range. • Information indicating the maximum total number of SSB / CSI-RS / CSI-IM resources set up for measurements such as L1-RSRP, L1-SINR, path loss, BFD, RLM, and new beam identification across all CCs in a single frequency range (e.g., maxNumberResAcrossCC-OneFR-r16). • Information indicating the maximum total number of SSB / CSI-RS / CSI-IM resources supported by the UE for beam management, path loss measurement, BFD, RLM, new beam identification, etc., across multiple frequency ranges (e.g., both FR1 and FR2) (e.g., maxTotalResourcesForOneFreqRange-r16). • Information indicating the maximum total number of SSB / CSI-RS / CSI-IM resources (e.g., maxNumberResWithinSlotAcrossCC-AcrossFR-r16) configured for measurements such as L1-RSRP, L1-SINR, path loss, BFD, RLM, and new beam identification within a single slot across all CCs across multiple frequency ranges. Information indicating the maximum total number of SSB / CSI-RS / CSI-IM resources set up for measurements such as L1-RSRP, L1-SINR, path loss, BFD, RLM, and new beam identification across all CCs across multiple frequency ranges (e.g., maxNumberResAcrossCC-AcrossFR-r16).

[0114] Note that the phrase "report specific UE capability information" above may be replaced with "report UE capability information of a specific value." For example, this "UE capability information of a specific value" may be information indicating the maximum number of CORESETs that can be set per BWP per cell, having a specific value (e.g., 3 or greater) (e.g., maxNumberCORESET-r16), or it may be information indicating the maximum number of CORESETs that can be set per CORESET pool index per BWP per cell, having a specific value (e.g., 3 or greater) (e.g., maxNumberCORESETPerPoolIndex-r16).

[0115] According to the second embodiment described above, the implicit BFD-RS determination method of the first embodiment can be used under appropriate conditions, and it is possible to avoid, for example, Rel.15 UE mistakenly using the implicit BFD-RS determination method of the first embodiment.

[0116] (Wireless communication system) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any or a combination thereof of the wireless communication methods according to the above embodiments of this disclosure.

[0117] Figure 2 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0118] Furthermore, the wireless communication system 1 may 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)), and so on.

[0119] 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.

[0120] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0121] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

[0122] 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).

[0123] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a 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 fall in a frequency band higher than FR2.

[0124] Furthermore, the user terminal 20 may communicate using at least one of the following methods at each CC: Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0125] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, if NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0126] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0127] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0128] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. 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), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0129] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0130] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, shared by each user terminal 20.

[0131] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0132] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0133] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0134] Furthermore, the DCI that schedules PDSCH may be called a DL assignment or DL ​​DCI, and the DCI that schedules PUSCH may be called a UL grant or UL DCI. Furthermore, PDSCH may be interpreted as DL data, and PUSCH may be interpreted as UL data.

[0135] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with a particular search space based on the search space configuration.

[0136] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0137] PUCCH may transmit uplink control information (UCI) which includes at least one of the following: channel state information (CSI), delivery acknowledgment (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0138] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[0139] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc., may be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc., may be transmitted.

[0140] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. SS, SSB, etc., may also be called reference signals.

[0141] Furthermore, in the wireless communication system 1, the Uplink Reference Signal (UL-RS) may transmit the Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. The DMRS may also be called the User-Specific Reference Signal (UE-specific Reference Signal).

[0142] (base station) Figure 3 shows an example of the configuration of a base station according to one 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 one or more of the control unit 110, transceiver unit 120, transceiver antenna 130, and transmission line interface 140 may be provided.

[0143] In this example, the functional blocks of the characteristic parts of this 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 part described below may be omitted.

[0144] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0145] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. 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 also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of radio resources, etc.

[0146] The transmitting / receiving 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 transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0147] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0148] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0149] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0150] The transmitting / receiving unit 120 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0151] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., to generate a bit sequence to be transmitted.

[0152] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, 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, and output a baseband signal.

[0153] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

[0154] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0155] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing to the acquired baseband signal, such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0156] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to 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 also measure received power (e.g., Reference Signal Received Power (RSRP)), reception 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.

[0157] The transmission path interface 140 may send and receive signals (backhaul signaling) with 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.

[0158] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0159] The transmitting / receiving unit 120 may not set a set of Reference Signal (RS) indices corresponding to the Beam Failure Detection (BFD) resource to the user terminal 20 via upper-layer signaling, but may instead set specific parameters (it may also transmit upper-layer signaling to set these specific parameters).

[0160] The control unit 110 may assume that the user terminal 20 selects up to a predetermined number of control resource sets (COntrol REsource SET (CORESET)) according to specific rules to determine which RS indices to include in the set, and evaluates the wireless link quality based on the RS corresponding to the RS indices (RS indices associated with the selected CORESET).

[0161] (User terminal) Figure 4 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0162] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0163] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0164] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0165] The transmitting / receiving 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 transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0166] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0167] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0168] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0169] The transmitting / receiving unit 220 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0170] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc., on data and control information acquired from the control unit 210, etc., to generate a bit sequence to be transmitted.

[0171] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, 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, and output a baseband signal.

[0172] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0173] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0174] 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.

[0175] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (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.

[0176] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0177] In this disclosure, the transmitting and receiving units of the user terminal 20 may consist of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0178] Furthermore, if the set of Reference Signal (RS) indices corresponding to the Beam Failure Detection (BFD) resources is not set by upper-layer signaling, and specific parameters (parameters described in the second embodiment above) are set, the control unit 210 may select up to a predetermined number of control resource sets (COntrol REsource SET (CORESET)) to determine which RS indices to include in the set, according to specific rules (one or more rules described in the first embodiment above).

[0179] The transmitting / receiving unit 220 may evaluate the wireless link quality based on the RS corresponding to the RS index.

[0180] The control unit 210 may further select up to a predetermined number of CORESETs to determine which RS indices to include in the set, in accordance with the specific rules, when it reports specific capability information (UE capability information as described in the second embodiment above).

[0181] The aforementioned specific rule may be a rule that selects up to a predetermined number of CORESETs, prioritizing, firstly, the small monitoring period of the corresponding search space set, and secondly, the size of the CORESET identifier.

[0182] The aforementioned specific parameters may be included in the beam fault recovery configuration information and notified from the base station 10.

[0183] (Hardware configuration) The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0184] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0185] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 5 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0186] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0187] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented using one or more chips.

[0188] 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 the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or to control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0189] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0190] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0191] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of this disclosure.

[0192] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital multipurpose disk, a Blu-ray disk), 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 called an auxiliary storage device.

[0193] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated implementations of a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0194] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0195] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0196] 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), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0197] (modified version) In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0198] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist 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.

[0199] Here, the neuralelogy may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neuralelogy may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain.

[0200] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0201] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0202] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0203] For example, one subframe may be called TTI, multiple consecutive subframes may be called TTI, or one slot or one mini-slot may be called TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0204] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0205] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0206] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0207] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in 3GPP Rel.8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a sub slot, or a slot.

[0208] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0209] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0210] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0211] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0212] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0213] A Bandwidth Part (BWP) (also called a partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0214] A BWP may include UL BWPs (BWPs for UL) and DL BWPs (BWPs for DL). One or more BWPs may be configured within a single carrier for a UE.

[0215] At least one of the configured BWPs may be active, and the UE does not need to assume that it will transmit or receive a given channel / signal outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0216] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative examples. For instance, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots within a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0217] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or corresponding other information. For example, wireless resources may be indicated by a predetermined index.

[0218] The names used for parameters and other elements in this disclosure are not restrictive in any way. Furthermore, mathematical formulas and other elements that use these parameters may differ from those expressly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0219] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0220] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0221] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0222] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof).

[0223] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Element (CE).

[0224] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not providing notification of the specified information or by providing notification of other information).

[0225] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0226] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0227] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0228] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0229] In this 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," and "panel" may be used interchangeably.

[0230] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0231] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0232] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0233] A mobile station may also be called 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 appropriate term.

[0234] 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, the mobile body itself, etc. 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 be a device that does not necessarily move during communication operation. 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.

[0235] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this 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), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc., may be interpreted as side channel.

[0236] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0237] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes with base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0238] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to that specific order.

[0239] Each aspect / embodiment described in this disclosure includes 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 (where x is, for example, an integer or 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®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), and IEEE This may be applied to systems utilizing 802.20, Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, as well as next-generation systems that extend these. It may also be applied in combination with multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0240] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0241] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0242] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to include judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0243] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0244] Furthermore, "judgment (decision)" can be considered as "judging (deciding)" something like resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can be considered as "judging (deciding)" something about an action.

[0245] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0246] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0247] In this disclosure, when two elements are connected, they can be considered to be “connected” or “coupled” to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, or optical domain (both visible and invisible).

[0248] In this 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 "combine" may be interpreted similarly to "different."

[0249] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0250] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0251] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The invention described herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined in the claims. Therefore, the descriptions herein are for illustrative purposes only and do not imply any limitation on the invention described herein.

[0252] This application is based on Japanese Patent Application No. 2021-67264, filed on April 12, 2021. All of its contents are included here.

Claims

1. A receiving unit that receives a control resource set (CORESET) pool index of a zero value and a CORESET pool index of a first value different from the zero value, based on upper layer parameters, In the Beam Failure Detection (BFD) - Reference Signal (RS) for PCell, PSCell, and SCell beam failures, if the set of RS resource indexes for BFD corresponding to the CORESET pool index of value 0 and the set of RS resource indexes for BFD corresponding to the CORESET pool index of value 1 are not set by the BFD resource settings, then the RS provided for the active transmit configuration instruction (TCI) state for downlink control channel (PDCCH) reception at the maximum CORESET ID among the multiple CORESETs corresponding to the CORESET pool index of value 0 is set as the set of RS resource indexes for BFD corresponding to the CORESET pool index of value 0, and among the multiple CORESETs corresponding to the CORESET pool index of value 1, the maximum CORESET The system includes a control unit that determines the RS provided for an active TCI state for PDCCH reception in an ID as a set of RS resource indices for a BFD corresponding to the CORESET pool index of the first value, The number of BFD-RSs limited by terminal capability information is the number of CORESET pool indexes for each of the values ​​of 0 and 1.

2. A step of receiving a control resource set (CORESET) pool index of a zero value and a CORESET pool index of a first value different from the zero value by a higher layer parameter, In the Beam Failure Detection (BFD) - Reference Signal (RS) for PCell, PSCell, and SCell beam failures, if the set of RS resource indexes for BFD corresponding to the CORESET pool index of value 0 and the set of RS resource indexes for BFD corresponding to the CORESET pool index of value 1 are not set by the BFD resource settings, then the RS provided for the active transmit configuration instruction (TCI) state for downlink control channel (PDCCH) reception at the maximum CORESET ID among the multiple CORESETs corresponding to the CORESET pool index of value 0 is set as the set of RS resource indexes for BFD corresponding to the CORESET pool index of value 0, and among the multiple CORESETs corresponding to the CORESET pool index of value 1, the maximum CORESET The process includes the step of determining the RS provided for an active TCI state for PDCCH reception in an ID as a set of RS resource indexes for a BFD corresponding to the CORESET pool index of the first value, A wireless communication method for a terminal, wherein the number of BFD-RS limited by terminal capability information is the number of CORESET pool indices for each of the values ​​of 0 and 1.

3. A transmission unit that transmits a control resource set (CORESET) pool index of a zero value and a CORESET pool index of a first value different from the zero value, using upper layer parameters, In the Beam Failure Detection (BFD) - Reference Signal (RS) for PCell, PSCell, and SCell beam failures, if the terminal does not set a set of RS resource indexes for BFD corresponding to the CORESET pool index of value 0 and a set of RS resource indexes for BFD corresponding to the CORESET pool index of value 1 by the BFD resource settings, then the RS provided for the active transmit configuration instruction (TCI) state for downlink control channel (PDCCH) reception at the maximum CORESET ID among the multiple CORESETs corresponding to the CORESET pool index of value 0 will be set as the set of RS resource indexes for BFD corresponding to the CORESET pool index of value 0, and the maximum CORESET among the multiple CORESETs corresponding to the CORESET pool index of value 1 The system includes a control unit which assumes that the RS provided for an active TCI state for PDCCH reception in an ID is determined as a set of RS resource indices for a BFD corresponding to the CORESET pool index of the first value, The number of BFD-RS limited by terminal capability information is the number of CORESET pool indices for each of the values ​​of 0 and 1, according to the base station.

4. A system including a terminal and a base station, The aforementioned terminal is A receiving unit that receives a control resource set (CORESET) pool index of value 0 and a CORESET pool index of value 1, which is different from the value 0, via upper layer parameters, In the Beam Failure Detection (BFD) - Reference Signal (RS) for PCell, PSCell, and SCell beam failures, if the set of RS resource indexes for BFD corresponding to the CORESET pool index of value 0 and the set of RS resource indexes for BFD corresponding to the CORESET pool index of value 1 are not set by the BFD resource settings, then the RS provided for the active transmit configuration instruction (TCI) state for downlink control channel (PDCCH) reception at the maximum CORESET ID among the multiple CORESETs corresponding to the CORESET pool index of value 0 is set as the set of RS resource indexes for BFD corresponding to the CORESET pool index of value 0, and among the multiple CORESETs corresponding to the CORESET pool index of value 1, the maximum CORESET The system includes a control unit that determines the RS provided for an active TCI state for PDCCH reception in an ID as a set of RS resource indices for a BFD corresponding to the CORESET pool index of the first value, The number of BFD-RS limited by terminal capability information is the number of CORESET pool index values ​​of 0 and 1. The aforementioned base station is A system having a transmission unit that transmits the aforementioned higher-layer parameters.

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