Terminal, wireless communication method, base station and system

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit which receives downlink control information (DCI) indicating a transmission configuration indication (TCI) state applicable to downlink and uplink; and a control unit which applies the TCI state at a timing based on the DCI. According to one aspect of the present disclosure, information regarding a QCL can be determined appropriately.

Description

[Technical Field]

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

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

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

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0005] In future wireless communication systems (e.g., NR), it is being considered that user terminals (UEs) will control transmission and reception processing based on information about quasi-co-location (QCL) (QCL assumptions / Transmission Configuration Indication (TCI) states / spatial relationships).

[0006] However, there are cases where information about the QCL is not clear, which can lead to degradation of communication quality and throughput.

[0007] Therefore, the present disclosure provides a terminal and a wireless communication method that appropriately determine information related to QCL. 、 base station and systems One of the aims is to provide [Means for solving the problem]

[0008] A terminal according to one aspect of the present disclosure includes a receiver for receiving downlink control information (DCI) indicating a transmission configuration indication (TCI) state applicable to a downlink and an uplink, and a receiver for receiving a downlink shared channel (PDSCH) scheduled by the DCI corresponding to the reception of the DCI. ACKnowledgement( ACK ) a control unit that applies the TCI state from the timing after the transmission of the the control unit controls to transmit an uplink control channel (PUCCH) including the ACK corresponding to the reception of the PDSCH using another TCI state indicated before the TCI state indicated by the DCI, and the control unit does not apply the TCI state to CORESET0. do. [Effects of the Invention]

[0009] According to one aspect of the present disclosure, information about a QCL can be appropriately determined. [Brief explanation of the drawings]

[0010] [Figure 1]FIG. 1 is a diagram illustrating an example of a unified TCI framework. [Figure 2] FIG. 2 is a diagram illustrating an example of a method for notifying the unified TCI state. [Figure 3] FIG. 3 is a diagram illustrating an example of a method for determining a TCI state according to the first embodiment. [Figure 4] 4A and 4B are diagrams illustrating an example of a method for determining a TCI state according to the second embodiment. [Figure 5] FIG. 5 is a diagram illustrating an example of a method for determining a TCI state according to the first modification of the second embodiment. [Figure 6] FIG. 6 is a diagram illustrating an example of a method for determining a TCI state according to the second modification of the second embodiment. [Figure 7] FIG. 7 is a diagram showing an example of common beam updating according to form 3-1. [Figure 8] FIG. 8 is a diagram showing an example of common beam updating according to form 3-2. [Figure 9] FIG. 9 is a diagram showing an example of common beam updating according to form 3-3. [Figure 10] FIG. 10 is a diagram showing an example of common beam updating according to form 3-4. [Figure 11] FIG. 11 is a diagram showing an example of common beam updating according to form 3-5. [Figure 12] FIG. 12 is a diagram showing an example of common beam updating according to form 3-6. [Figure 13] FIG. 13 is a diagram showing an example of association between code points in the TCI field and active TCI states according to the sixth embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 15] FIG. 15 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 16] FIG. 16 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 17]FIG. 17 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (TCI, spatial relations, QCL) In NR, it is being considered to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) in the UE of at least one of a signal and a channel (referred to as signal / channel) based on the transmission configuration indication state (TCI state).

[0012] The TCI state may represent that which is applied to a downlink signal / channel, and the equivalent of the TCI state which is applied to an uplink signal / channel may be expressed as a spatial relation.

[0013] The TCI state is information about the quasi-co-location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relation information, etc. The TCI state may be configured in the UE for each channel or signal.

[0014] A QCL is an index that indicates the statistical properties of a signal / channel. For example, if a signal / channel has a QCL relationship with another signal / channel, it may mean that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same between these different signals / channels (i.e., they are QCLs with respect to at least one of these).

[0015] The spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be determined based on a spatial QCL. A QCL (or at least one element of a QCL) in the present disclosure may be replaced with an sQCL (spatial QCL).

[0016] A plurality of types (QCL types) of QCLs may be defined. For example, four QCL types A and B may be provided, each having different parameters (or parameter sets) that can be assumed to be the same. The parameters (which may also be referred to as QCL parameters) are listed 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.

[0017] The assumption by a UE that a Control Resource Set (CORESET), channel, or reference signal has a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be referred to as a QCL assumption.

[0018] The UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal / channel based on the TCI condition or QCL assumption of the signal / channel.

[0019] The TCI state may be, for example, information about the QCL between the target channel (in other words, the Reference Signal (RS) for the channel) and another signal (e.g., another RS). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

[0020] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0021] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0022] Furthermore, the RS that has a QCL relationship with the channel may be, for example, at least one of a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), a CSI-RS for tracking (also called a Tracking Reference Signal (TRS)), and a QCL detection reference signal (also called a QRS).

[0023] 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 referred to as an SS / PBCH block.

[0024] An RS of QCL type X in a TCI state may refer to an RS that has a relationship of QCL type X with (the DMRS of) a certain channel / signal, and this RS may be called a QCL source of QCL type X in the TCI state.

[0025] (Path loss RS) Path loss PL in the transmission power control of PUSCH, PUCCH, and SRS b,f,c (q d ) [dB] is the index q of the reference signal (RS, Pathloss Reference RS) for the downlink BWP associated with the active UL BWP b of carrier f of serving cell c. d In this disclosure, the path loss reference RS, pathloss(PL)-RS, and index q d, RS used for path loss calculation, and RS resource used for path loss calculation may be interchangeable. In the present disclosure, calculation, estimation, measurement, and track may be interchangeable.

[0026] It is being considered whether to modify the existing mechanism of higher layer filtered RSRP for path loss measurement when the path loss RS is updated by the MAC CE.

[0027] When the pathloss RS is updated by the MAC CE, pathloss measurement based on L1-RSRP may be applied. At an available timing after the MAC CE for updating the pathloss RS, the upper layer filtered RSRP may be used for pathloss measurement, and before the upper layer filtered RSRP is applied, the L1-RSRP may be used for pathloss measurement. At an available timing after the MAC CE for updating the pathloss RS, the upper layer filtered RSRP may be used for pathloss measurement, and before that timing, the upper layer filtered RSRP of the previous pathloss RS may be used. Similar to the operation in Rel. 15, the upper layer filtered RSRP is used for pathloss measurement, and the UE may track all pathloss RS candidates configured by the RRC. The maximum number of pathloss RSs configurable by the RRC may depend on the UE capability. If the maximum number of pathloss RSs configurable by the RRC is X, X or fewer pathloss RS candidates may be configured by the RRC, and the MAC CE may select a pathloss RS from the configured pathloss RS candidates. The maximum number of pathloss RSs configurable by the RRC may be 4, 8, 16, 64, etc.

[0028] In the present disclosure, upper layer filtered RSRP, filtered RSRP, and layer 3 filtered RSRP may be read interchangeably.

[0029] (Default TCI State / Default Spatial Relationship / Default PL-RS) In RRC connected mode, both when the TCI information in DCI (higher layer parameter TCI-PresentInDCI) is set to "enabled" and when the TCI information in DCI is not set, if the time offset between the reception of a DL DCI (DCI scheduling a PDSCH) and the corresponding PDSCH (PDSCH scheduled by that DCI) is smaller than a threshold (timeDurationForQCL) (applicability condition, first condition), in the case of non-cross-carrier scheduling, the TCI state of the PDSCH (default TCI state) may be the TCI state of the lowest CORESET ID in the latest slot in the active DL BWP of that CC (of the specific UL signal). Otherwise, the TCI state of the PDSCH (default TCI state) may be the TCI state of the lowest TCI state ID of the PDSCH in the active DL BWP of the scheduled CC.

[0030] In Rel.15, separate MAC CEs are required for the activation / deactivation of PUCCH spatial relations and for the activation / deactivation of SRS spatial relations. The PUSCH spatial relations follow the SRS spatial relations.

[0031] In Rel. 16, at least one of the MAC CE for PUCCH spatial-related activation / deactivation and the MAC CE for SRS spatial-related activation / deactivation may not be used.

[0032] If neither the spatial relationship nor the PL-RS for the PUCCH is configured in FR2 (applicable condition, second condition), the default assumptions of the spatial relationship and the PL-RS for the PUCCH (default spatial relationship and default PL-RS) are applied. If neither the spatial relationship nor the PL-RS for the SRS (SRS resource for the SRS or SRS resource corresponding to the SRI in DCI format 0_1 ​​that schedules the PUSCH) is configured in FR2 (applicable condition, second condition), the default assumptions of the spatial relationship and the PL-RS for the PUSCH and SRS scheduled by DCI format 0_1 ​​(default spatial relationship and default PL-RS) are applied.

[0033] If a CORESET is configured in an active DL BWP on the CC (conditions apply), the default spatial relationship and default PL-RS may be the TCI state or QCL assumption of the CORESET with the lowest CORESET ID in the active DL BWP. If a CORESET is not configured in an active DL BWP on the CC, the default spatial relationship and default PL-RS may be the active TCI state with the lowest PDSCH ID in the active DL BWP.

[0034] In Rel.15, the spatial relationship of PUSCH scheduled by DCI format 0_0 follows the spatial relationship of the PUCCH resource with the lowest PUCCH resource ID among the active spatial relationships of PUCCH on the same CC. The network needs to update the PUCCH spatial relationships on all SCells even if no PUCCH is transmitted on the SCell.

[0035] In Rel.16, PUCCH configuration is not required for a PUSCH scheduled by DCI format 0_0. If there is no active PUCCH spatial relationship or no PUCCH resource on the active UL BWP in the CC for a PUSCH scheduled by DCI format 0_0 (applicable condition, second condition), the default spatial relationship and default PL-RS are applied to the PUSCH.

[0036] The application conditions for the default spatial relationship / default PL-RS for SRS may include setting a default beam path loss enable information element for SRS (upper layer parameter enableDefaultBeamPlForSRS) to valid. The application conditions for the default spatial relationship / default PL-RS for PUCCH may include setting a default beam path loss enable information element for PUCCH (upper layer parameter enableDefaultBeamPlForPUCCH) to valid. The application conditions for the default spatial relationship / default PL-RS for PUSCH scheduled by DCI format 0_0 may include setting a default beam path loss enable information element for PUSCH scheduled by DCI format 0_0 (upper layer parameter enableDefaultBeamPlForPUSCH0_0) to valid.

[0037] The above threshold may also be referred to as time duration for QCL, "timeDurationForQCL", "Threshold", "Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset", schedule offset threshold, scheduling offset threshold, etc.

[0038] (Multi-TRP) In NR, one or more Transmission / Reception Points (TRPs) (multi-TRPs (MTRPs)) are considered to perform DL transmission to a UE using one or more panels (multi-panels). Also, it is considered that a UE performs UL transmission to one or more TRPs using one or more panels.

[0039] Note that multiple TRPs may correspond to the same cell identifier (ID), or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0040] Multi-TRPs (e.g., TRPs #1 and #2) may be connected by ideal / non-ideal backhauls to exchange information, data, etc. Each TRP of the multi-TRP may transmit a different code word (CW) and a different layer. Non-Coherent Joint Transmission (NCJT) may be used as a form of multi-TRP transmission.

[0041] In the NCJT, for example, TRP#1 performs modulation mapping and layer mapping on a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding, and TRP#2 performs modulation mapping and layer mapping on a second codeword to transmit a second number of layers (e.g., two layers) with a second precoding.

[0042] Note that multiple PDSCHs (multi-PDSCHs) that are non-coherent may be defined as partially or completely overlapping in at least one of the time and frequency domains, i.e., a first PDSCH from a first TRP and a second PDSCH from a second TRP may overlap in at least one of the time and frequency resources.

[0043] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (Quasi-Co-Location (QCL)). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0044] Multiple PDSCHs from multiple TRPs (which may also be referred to as multiple PDSCHs) may be scheduled using one DCI (single DCI, single PDCCH) (single-master mode, single-DCI based multi-TRP). Multiple PDSCHs from multiple TRPs may also be scheduled using multiple DCIs (multiple DCI, multiple PDCCHs) (multi-master mode, multi-DCI based multi-TRP).

[0045] Such a multi-TRP scenario allows for more flexible transmission control using good quality channels.

[0046] To support intra-cell (having the same cell ID) and inter-cell (having different cell IDs) multi-TRP transmission based on multiple PDCCHs, in the RRC configuration information for linking multiple pairs of PDCCHs and PDSCHs with multiple TRPs, one control resource set (CORESET) in the PDCCH configuration information (PDCCH-Config) may correspond to one TRP.

[0047] (CSI) In NR, a UE measures a channel state using a reference signal (or a resource for the reference signal) and feeds back (reports) channel state information (CSI) to a network (e.g., a base station).

[0048] The UE may measure the channel state using at least one of a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), a Demodulation Reference Signal (DMRS), etc.

[0049] The CSI-RS resources may include at least one of non-zero power (NZP) CSI-RS resources, zero power (ZP) CSI-RS resources, and CSI interference measurement (CSI-IM) resources.

[0050] Resources for measuring signal components for CSI may be referred to as signal measurement resources (SMR) or channel measurement resources (CMR). SMR (CMR) may include, for example, NZP CSI-RS resources, SSB, etc. for channel measurement.

[0051] The resource for measuring the interference component for CSI may be referred to as an Interference Measurement Resource (IMR). The IMR may include, for example, at least one of an NZP CSI-RS resource, an SSB, a ZP CSI-RS resource, and a CSI-IM resource for interference measurement.

[0052] An SS / PBCH block is a block that includes a synchronization signal (e.g., a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS)) and a PBCH (and corresponding DMRS), and may also be referred to as an SS block (SSB).

[0053] The CSI may include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), a SS / PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), a Layer 1 Reference Signal Received Power (L1-RSRP), a Reference Signal Received Quality (L1-RSRQ), a Signal to Interference plus Noise Ratio (L1-SINR), a Signal to Noise Ratio (L1-SNR), and the like.

[0054] The CSI may have multiple parts. CSI Part 1 may include information with a relatively small number of bits (e.g., RI). CSI Part 2 may include information with a relatively large number of bits (e.g., CQI), such as information determined based on CSI Part 1.

[0055] Furthermore, CSI may be classified into several CSI types. The type and size of information to be reported may differ depending on the CSI type. For example, a CSI type set for communication using a single beam (also referred to as type 1 (type I) CSI, single-beam CSI, etc.) and a CSI type set for communication using multiple beams (also referred to as type 2 (type II) CSI, multi-beam CSI, etc.) may be defined. The use of CSI types is not limited to this.

[0056] Methods of CSI feedback under consideration include periodic CSI (P-CSI) reporting, aperiodic CSI (A-CSI, AP-CSI) reporting, and semi-persistent CSI (SP-CSI) reporting.

[0057] The UE may be notified of the CSI measurement configuration information using higher layer signaling, physical layer signaling, or a combination thereof.

[0058] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, or a combination thereof.

[0059] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0060] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0061] The CSI measurement configuration information may be configured, for example, using the RRC information element "CSI-MeasConfig." The CSI measurement configuration information may include CSI resource configuration information (RRC information element "CSI-ResourceConfig"), CSI reporting configuration information (RRC information element "CSI-ReportConfig"), etc. The CSI resource configuration information is related to resources for CSI measurement, and the CSI reporting configuration information is related to how the UE performs CSI reporting.

[0062] The RRC information elements (or RRC parameters) related to CSI reporting configuration and CSI resource configuration will be described.

[0063] The CSI reporting configuration information ("CSI-ReportConfig") includes resource information for channel measurement ("resourcesForChannelMeasurement"). The CSI reporting configuration information may also include resource information for interference measurement (e.g., NZP CSI-RS resource information for interference measurement ("nzp-CSI-RS-ResourcesForInterference"), CSI-IM resource information for interference measurement ("csi-IM-ResourcesForInterference"), etc.). These pieces of resource information correspond to the ID (Identifier) ​​of the CSI resource configuration information ("CSI-ResourceConfigId").

[0064] Note that the IDs of the CSI resource configuration information corresponding to each piece of resource information (which may also be referred to as CSI resource configuration IDs) may be one or more of the same value, or may each have a different value.

[0065] The CSI resource configuration information ("CSI-ResourceConfig") may include a CSI resource configuration information ID, CSI-RS resource set list information ("csi-RS-ResourceSetList"), resource type ("resourceType"), etc. The CSI-RS resource set list may include at least one of NZP CSI-RS and SSB information for measurement ("nzp-CSI-RS-SSB") and CSI-IM resource set list information ("csi-IM-ResourceSetList").

[0066] The resource type indicates the time-domain behavior of this resource configuration, and can be set to "aperiodic," "semi-persistent," or "periodic." For example, the corresponding CSI-RSs may be referred to as A-CSI-RS (AP-CSI-RS), SP-CSI-RS, and P-CSI-RS, respectively.

[0067] The channel measurement resources may be used to calculate, for example, CQI, PMI, L1-RSRP, etc. The interference measurement resources may be used to calculate L1-SINR, L1-SNR, L1-RSRQ, and other indices related to interference.

[0068] (Unified TCI Framework) It is being considered to use the same TCI state for both UL and DL channels.

[0069] In the example of FIG. 1, the TCI state including the DL-RS is used for the QCL assumption of the PDCCH / PDSCH / CSI-RS, the spatial relationship of the SRS / PUCCH, and the spatial relationship of the PUSCH.

[0070] It is being considered that RRC / MAC-CE / DCI may be used to select one TCI state for UL / DL.

[0071] In the example of Figure 2, multiple unified TCI states for DL ​​are configured by the RRC, and multiple unified TCI states for UL are configured by the RRC, and each of the multiple unified TCI states for DL ​​and the multiple unified TCI states for UL may be SSB, CSI-RS, or SRS.

[0072] A portion of the unified TCI state for DL ​​configured by RRC is activated by the MAC CE as the unified TCI state for DL. A portion of the unified TCI state for DL ​​configured by RRC is activated by the MAC CE as the unified TCI state for UL. A portion of the unified TCI state for UL configured by RRC is activated by the MAC CE as the unified TCI state for UL. A portion of the unified TCI state for DL ​​activated by the MAC CE is indicated by the DCI. A portion of the unified TCI state for UL activated by the MAC CE is indicated by the DCI.

[0073] The unified TCI framework allows UL and DL channels to be controlled by a common framework. Instead of specifying TCI states or spatial relationships for each channel as in Rel. 15, the unified TCI framework may specify a common beam and apply it to all UL and DL channels, or may apply a common beam for UL to all UL channels and a common beam for DL ​​to all DL channels.

[0074] However, the timing at which the TCI state is applied is unclear. If the timing is unclear, discrepancies may occur between the UE and the base station, which may lead to deterioration in communication quality and throughput.

[0075] Therefore, the present inventors came up with a method for determining the TCI state.

[0076] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0077] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read as interchangeable. In the present disclosure, cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as interchangeable. In the present disclosure, index, ID, indicator, and resource ID may be read as interchangeable. In the present disclosure, support, control, controllable, operate, and operable may be read as interchangeable.

[0078] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read interchangeably.

[0079] In the present disclosure, MAC CE and activation / deactivation command may be read interchangeably.

[0080] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, higher layer, higher layer parameters, RRC information elements (IEs), and RRC messages may be interchangeable.

[0081] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0082] In this disclosure, the terms beam, spatial-domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, QCL assumption, QCL parameter, spatial-domain receive filter, UE spatial-domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS for QCL type D in TCI state / QCL assumption, RS for QCL type A in TCI state / QCL assumption, spatial relationship, spatial-domain transmit filter, UE spatial-domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, and PL-RS may be interchangeable. In this disclosure, the terms QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS, and SRS may be interchangeable.

[0083] UL DCI, DCI scheduling the UL channel (PUSCH), and DCI format 0_x (x=0, 1, 2, ...) may be interchangeable. DL DCI, DCI scheduling the DL channel (PDSCH), and DCI format 1_x (x=0, 1, 2, ...) may be interchangeable.

[0084] In the present disclosure, HARQ-ACK information, ACK, and NACK may be read interchangeably.

[0085] In this disclosure, the terms "single TRP," "single TRP system," "single TRP transmission," and "single PDSCH" may be interchangeable. In this disclosure, the terms "multiple TRP," "multiple TRP system," "multiple TRP transmission," and "multiple PDSCH" may be interchangeable. In this disclosure, the terms "single DCI," "single PDCCH," "multiple TRP based on a single DCI," and "activating two TCI states on at least one TCI codepoint" may be interchangeable.

[0086] In the present disclosure, single TRP, channel using single TRP, channel using one TCI state / spatial relationship, no multi-TRP enabled by RRC / DCI, no multiple TCI states / spatial relationships enabled by RRC / DCI, no CORESETPoolIndex value of 1 set for any CORESET, and no codepoint in the TCI field mapped to two TCI states may be read interchangeably.

[0087] In the present disclosure, "multi-TRP," "channel using multi-TRP," "channel using multiple TCI states / spatial relationships," "multi-TRP being enabled by RRC / DCI," "multiple TCI states / spatial relationships being enabled by RRC / DCI," and "at least one of multi-TRP based on a single DCI" and "multi-TRP based on multiple DCI" may be interchangeable. In the present disclosure, "multi-TRP based on multiple DCI," and "setting a CORESET pool index (CORESETPoolIndex) value of 1 for the CORESET" may be interchangeable. In the present disclosure, "multi-TRP based on a single DCI," and "at least one code point in the TCI field is mapped to two TCI states" may be interchangeable.

[0088] In the present disclosure, the terms CSI-RS, NZP-CSI-RS, periodic (P)-CSI-RS, P-TRS, semi-persistent (SP)-CSI-RS, aperiodic (A)-CSI-RS, TRS, CSI-RS with TRS information (higher layer parameter trs-Info), and NZP CSI-RS resource in an NZP CSI-RS resource set with TRS information may be interchangeable. In the present disclosure, the terms CSI-RS resource, CSI-RS resource set, CSI-RS resource group, and information element (IE) may be interchangeable.

[0089] (Wireless communication method) In the present disclosure, the terms pool, set, group, and list may be read interchangeably.

[0090] In the present disclosure, the terms common beam, unified TCI state, beam applicable to DL and UL, beam applied to multiple channels, and PL-RS may be read interchangeably.

[0091] First Embodiment The UE may assume the same TCI state pool for UL and DL.

[0092] The RRC (parameters, information elements) may configure multiple TCI states (pools) for UL / DL channels.

[0093] The MAC CE may select (activate) one or more (eg, multiple) TCI states (sets) for the UL / DL channels.

[0094] The UL / DL DCI may select (indicate) one or more (e.g., one) TCI states, which may apply to multiple UL / DL channels, which may be PDCCH / PDSCH / PUSCH / SRS / PUCCH.

[0095] The UL / DL DCI may include a new TCI field. The UL / DL DCI may be at least one of DCI formats 0_1, 0_2, 1_1, and 1_2. The new TCI field may select at least one (e.g., one) of multiple active TCI states.

[0096] If the new TCI field exists in DCI formats 1_1 and 1_2, the TCI field of Rel. 15 / 16 may not exist in DCI formats 1_1 and 1_2.

[0097] The presence of a new TCI field in the DCI may be configured by a higher layer. The presence of a new DCI field in the UL DCI and the presence of a new DCI field in the DL DCI may be configured separately. The presence of a new DCI field in the UL DCI and the presence of a new DCI field in the DL DCI may be configured jointly.

[0098] The size (number of bits) of the TCI field may be the same or different between the UL DCI and the DL DCI. For example, the size of the TCI field in the DL DCI may be larger than the size of the TCI field in the UL DCI.

[0099] In the example of Figure 3, the RRC configures multiple TCI states for DL ​​and UL. Each of the multiple TCI states may be SSB, CSI-RS, or SRS. The MAC CE activates some of the configured multiple TCI states. The DCI indicates at least one of the activated multiple TCI states.

[0100] The indicated TCI state applies to multiple UL / DL channels, which may be PDCCH / PDSCH / PUSCH / SRS / PUCCH.

[0101] The MAC CE based beam management may align the default beams for UL and DL. The default TCI state of the PDSCH may be updated to align with the default UL beam (spatial relationship).

[0102] DCI-based beam management may indicate a common beam / unified TCI state from the same TCI state pool for both UL and DL. M (>1) TCI states may be activated by the MAC CE. The UL / DL DCI may select one of the M active TCI states. The selected TCI state may apply to both UL and DL channels / RS.

[0103] According to the first embodiment described above, the TCI state set in one pool can be used for both UL and DL channels.

[0104] <Second embodiment> The UE may assume different TCI state pools for the UL and DL.

[0105] The RRC (parameters, information elements) may configure multiple TCI states (pools) for each of the UL and DL channels.

[0106] The MAC CE may select (activate) one or more (eg, multiple) TCI states (sets) for each of the UL and DL channels. The MAC CE may activate two sets of TCI states.

[0107] One MAC CE format may be specified for both DL and UL. One MAC CE (one transmission) may indicate two sets of TCI states. The two sets of TCI states may be for DL ​​and UL, respectively. Two MAC CEs (two transmissions) may indicate one set of TCI states for DL ​​and one set of TCI states for UL, respectively. Each MAC CE may include a 1-bit field indicating whether it is for DL ​​or UL.

[0108] Different MAC CE formats may be defined for DL ​​and UL.

[0109] The DL DCI may select (indicate) one or more (e.g., one) TCI states, which may apply to one or more DL channels, which may be PDCCH / PDSCH / CSI-RS.

[0110] The UL DCI selects (indicates) one or more (e.g., one) TCI states, which may apply to one or more UL channels, which may be PUSCH / SRS / PUCCH.

[0111] The UL / DL DCI may include a new TCI field. The UL / DL DCI may be at least one of DCI formats 0_1, 0_2, 1_1, and 1_2. The new TCI field may select at least one (e.g., one) of multiple active TCI states.

[0112] If the new TCI field exists in DCI formats 1_1 and 1_2, the TCI field of Rel.15 / 16 may not exist in DCI formats 1_1 and 1_2. The new TCI field may not exist in DCI formats 1_1 and 1_2. The existing TCI field may be reused to indicate the TCI status in this embodiment.

[0113] The presence of a new TCI field in the DCI may be configured by a higher layer. The presence of a new DCI field in the UL DCI and the presence of a new DCI field in the DL DCI may be configured separately. The presence of a new DCI field in the UL DCI and the presence of a new DCI field in the DL DCI may be configured jointly.

[0114] The size (number of bits) of the TCI field may be the same or different between the UL DCI and the DL DCI. For example, the size of the TCI field in the DL DCI may be larger than the size of the TCI field in the UL DCI.

[0115] At least one of the presence and size of the TCI field in the DCI may be determined by the number of TCI states activated by the MAC CE.

[0116] In the example of Figure 4A, the RRC configures multiple TCI states for DL. Each TCI state may be SSB, CSI-RS, or SRS. The MAC CE activates multiple TCI states for DL ​​from the configured multiple TCI states for DL. The DL DCI indicates at least one of the activated multiple TCI states for DL. The indicated TCI state for DL ​​applies to the DL channel. The DL channel may be CSI-RS / PDCCH / PDSCH.

[0117] In the example of Figure 4B, the RRC configures multiple TCI states for the UL. Each TCI state may be SSB, CSI-RS, or SRS. The MAC CE activates multiple TCI states for the UL from the configured multiple TCI states for the UL. The UL DCI indicates at least one of the activated multiple TCI states for the UL. The indicated TCI state for the UL applies to the UL channel. The UL channel may be PUCCH / PUSCH.

[0118] Variation 1 The RRC may configure a pool of TCI states common to UL and DL, from which one or more TCI states for DL ​​may be activated and one or more TCI states for UL may be activated.

[0119] In the example of Figure 5, the RRC configures multiple TCI states for DL ​​and UL, each of which may be SSB, CSI-RS, or SRS.

[0120] The first MAC CE activates multiple TCI states for DL ​​from the configured multiple TCI states. The DL DCI indicates at least one of the activated multiple TCI states for DL. The indicated TCI state for DL ​​is applied to a DL channel. The DL channel may be a CSI-RS / PDCCH / PDSCH.

[0121] The second MAC CE activates multiple TCI states for the UL from the configured multiple TCI states. The UL DCI indicates at least one of the activated multiple TCI states for the UL. The indicated TCI state for the UL applies to the UL channel. The UL channel may be the PUCCH / PUSCH.

[0122] Variation 2 Among the activated TCI states, one or more TCI states for DL ​​and one or more TCI states for UL may be indicated independently. The UL DCI and the DL DCI may indicate different TCI states.

[0123] In the example of Figure 6, the RRC configures multiple TCI states for DL ​​and UL, each of which may be SSB, CSI-RS, or SRS, and the MAC CE activates multiple TCI states among the configured TCI states.

[0124] The DL DCI indicates at least one DL TCI state among the activated TCI states, and the indicated DL TCI state applies to a DL channel, which may be a CSI-RS / PDCCH / PDSCH.

[0125] The UL DCI indicates at least one UL TCI state among the activated TCI states, and the indicated UL TCI state applies to the UL channel, which may be the PUCCH / PUSCH.

[0126] According to the second embodiment described above, the TCI state for DL ​​and the TCI state for UL can be appropriately determined.

[0127] <Third embodiment> The UE may receive a DCI indicating a unified / common TCI state and apply the indicated TCI state in beam update timing based on the DCI.

[0128] The UE may apply the indicated TCI state to a first channel (one or more channels / RSs / resources) at a first timing (timing #1). The UE may apply the indicated TCI state to a second channel (one or more channels / RSs / resources) at a second timing (timing #2) after the first timing. The UE may apply the indicated TCI state to a third channel (one or more channels / RSs / resources) at a third timing (timing #3) after the second timing.

[0129] The beam update timing may follow at least one of the following forms 3-1 to 3-6.

[0130] 《Form 3-1》 The DCI may update the common beam for DL ​​and UL at at least one of the timings of receiving a scheduled PDSCH, transmitting the corresponding HARQ-ACK information, and transmitting a scheduled PUSCH. The timing of updating the beam may be the same as in Rel. 15.

[0131] The common beam may be updated after a specific time from the last symbol of DCI reception, which may be K symbols or K slots, where K may be specified by a specification, configured by a higher layer, or reported by the UE as a UE capability.

[0132] In the example of Figure 7, the DCI indicates TCI state #2 among multiple active TCI states. The UE updates the common beam to TCI state #2 K symbols after the last symbol of DCI reception (timing #1). Thereafter, TCI state #2 is used for the TCI state of PDSCH reception and the spatial relationship of the corresponding PUCCH transmission containing HARQ-ACK information. No new DCI field for DCI-level beam indication is required for this PUCCH TCI state.

[0133] 《Form 3-2》 If the reception of the DCI fails, the base station assumes that the common beam has been updated, and the UE assumes that the common beam has not been updated.If the reception of the DCI that schedules the PDSCH fails, the question arises as to whether the base station can reschedule the PDSCH.

[0134] If there is a possibility of retransmission of the PDSCH / PUSCH, the UE may monitor the DCI using the beam before the update.

[0135] At the timing of PDSCH reception, the common beam assumption may be updated, except for DCI reception which may schedule a retransmission.

[0136] The question now becomes how to identify DCIs for which retransmissions may be scheduled.

[0137] DCIs scheduling initial and retransmissions may use the same CORESET / search space / QCL assumption / TCI state.

[0138] In the example of Fig. 8, the DCI, PDSCH, and PUCCH are the same as those in Fig. 7. In this example, at timing #1, all common beams except for the CORESET for scheduling the PDSCH (DCI for which retransmission may be scheduled) are updated, and at timing #2 after the UE transmits a PUCCH including an ACK or NACK corresponding to that PDSCH, the beams in the CORESET for scheduling the PDSCH are updated to those common beams.

[0139] 《Form 3-3》 Different beam update timing may be applied to PDCCH and other channels.

[0140] The UE may assume at least one of the following assumptions 1 to 4:

[0141] [Assumption 1] One TCI field in DCI format 1_1 / 1_2 indicates a common beam for both DL and UL, or a common beam for DL ​​only.

[0142] [Assumption 2] One TCI field in DCI format 0_1 / 0_2 indicates a common beam for both DL and UL, or a common beam for UL only.

[0143] [Assumption 3] When separate common beams are used for DL ​​and UL, two TCI fields in DCI format 1_1 / 1_2 indicate the common beam for DL ​​and the common beam for UL, respectively.

[0144] [Assumption 4] When separate common beams are used for DL ​​and UL, two TCI fields in DCI format 0_1 / 0_2 indicate the common beam for DL ​​and the common beam for UL, respectively.

[0145] In the example of Fig. 9, the DCI, PDSCH, and PUCCH are the same as those in Fig. 7. In this example, at timing #1, the common beams excluding the PDCCH are updated. At timing #2, the PDCCH beam is updated to the common beam.

[0146] 《Form 3-4》 The indicated TCI state may be used for PDSCH reception. This TCI state may be indicated by a new TCI field. If the scheduling offset (time offset) between the DCI and the PDSCH scheduled by it is smaller than a threshold (e.g., timeDurationForQCL), the default DL beam (TCI state) may be applied for PDSCH reception (similar to Rel. 15).

[0147] For the PUCCH, the indicated TCI state, or the previous common TCI state, or the configured spatial relationship may be applied.

[0148] In this case, there is no beam discrepancy between the UE and the base station.

[0149] In the example of Figure 10, the DCI, PDSCH, and PUCCH are the same as those in Figure 7. In this example, TCI state #2 indicated by the DCI is applied to PDSCH reception, and the common beam is updated after PUCCH transmission (timing #1).

[0150] 《Form 3-5》 After the UE sends the HARQ-ACK information, the common beam for all channels may be updated. For the PDSCH, DCI-level beam updating may not be possible.

[0151] To enable DCI level beam updating for PDSCH, the TCI field of Rel.15 may be reused. The TCI field of Rel.15 may apply only to scheduled PDSCH. The new TCI field may apply to all channels.

[0152] In the example of Fig. 11, the DCI, PDSCH, and PUCCH are the same as those in Fig. 7. In this example, after PUCCH transmission (timing #1), the common beams for all channels / RSs are updated.

[0153] 《Form 3-6》 At least one of the aspects 3-1 to 3-5 may be applied to the PUSCH. In at least one of the aspects 3-1 to 3-5, PDSCH reception may be replaced with PUSCH transmission, and HARQ-ACK information (PUCCH) transmission may be replaced with PUSCH transmission.

[0154] Figure 12 shows the case where form 3-4 is applied to the PUSCH. In this example, the DCI indicates TCI state #2 among multiple active TCI states. This DCI schedules the PUSCH. The UE applies the indicated TCI state to the PUSCH transmission. After the PUSCH transmission (timing #1), the common beam is updated.

[0155] According to the above third embodiment, the recognition of DL / UL beams can be coordinated between the UE and the base station.

[0156] <Fourth embodiment> In the embodiments 3-1 to 3-4, the beam of the PDSCH is updated by the DCI that schedules it. The UE needs to assume the QCL assumption for buffering the received signal, but before decoding the DCI, the UE does not know whether the PDSCH is scheduled or not.

[0157] The UE may assume a default DL beam (similar to Rel. 15) (default TCI state for PDSCH) to buffer the received signal. The UE may apply the default TCI state for reception from the reception of DCI until the beam update timing.

[0158] According to the above fourth embodiment, even if a beam is instructed by DCI that schedules a PDSCH, the UE can properly receive the PDSCH.

[0159] <Fifth embodiment> At least one of the first to fourth embodiments may be applied to a specific CORESET.

[0160] The specific CORESET may be all CORESETs.

[0161] The specific CORESET may be any CORESET that has a TCI state. At least one of the first to fourth embodiments may not be applied to CORESET0 that does not have a TCI state setting. CORESET0 may be used as a fallback to Rel.15 / 16 beam management.

[0162] The specific CORESET may be a CORESET other than CORESET0. At least one of the first to fourth embodiments may not be applied to CORESET0.

[0163] The specific CORESET may be a CORESET (CORESET for single TRP) excluding a CORESET configured with multiple TRPs (CORESET pool index, CORESET pool index of "1"). At least one of the first to fourth embodiments may not be applied to a CORESET configured with multiple TRPs. The unified TCI framework may be used for a single TRP.

[0164] According to the above fifth embodiment, the UE can apply a common beam to an appropriate CORESET.

[0165] Sixth Embodiment If a new TCI field is applied to multiple or all UL / DL channels, it may not be necessary for the common beam to be updated at every DCI reception timing.

[0166] The code point of the new TCI field may include a no-update state. If the no-update state is indicated by the DCI, the UE may maintain the common beam. The no-update state may be specified by a specific code point. The specific code point may be 000 or may be configured by a higher layer.

[0167] In the example of Figure 13, active TCI states #1 to #7 in the common active TCI state pool are associated with code points 001 to 111 in the new TCI field, respectively. If the new TCI field indicates any of code points 001 to 111, the UE updates the common beam to the TCI state corresponding to the code point. The specific code point 000 is associated with the no update state. If the new TCI field indicates code point 000, the UE maintains the common beam.

[0168] According to the sixth embodiment described above, whether or not to update the common beam is appropriately indicated.

[0169] Seventh Embodiment A UE capability corresponding to at least one function (feature) in the first to sixth embodiments may be defined. If the UE reports this UE capability, the UE may perform the corresponding function. If the UE reports this UE capability and higher layer parameters corresponding to this function are configured, the UE may perform the corresponding function. Higher layer parameters (RRC information elements) corresponding to this function may be defined. If these higher layer parameters are configured, the UE may perform the corresponding function.

[0170] The UE capability may indicate whether the UE supports this feature.

[0171] The UE capability may indicate the maximum number of RRC-configured TCI states that the UE supports. The maximum number of RRC-configured TCI states may be the maximum number of TCI states configured for both UL and DL. The maximum number of RRC-configured TCI states may be reported separately for the maximum number of UL-configured TCI states and the maximum number of DL-configured TCI states.

[0172] The UE capabilities may indicate the maximum number of active TCI states that the UE supports. The maximum number of active TCI states may be the maximum number of active TCI states for both UL and DL. The maximum number of active TCI states may be reported separately for the maximum number of active TCI states for UL and the maximum number of active TCI states for DL.

[0173] The UE capabilities may indicate whether the UE supports different active TCI state pools for the UL and DL.

[0174] According to the seventh embodiment, the UE can achieve at least one of the above functions while maintaining compatibility with existing specifications.

[0175] (wireless communication system) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0176] 14 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0177] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0178] 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.

[0179] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0180] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0181] 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).

[0182] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be a frequency band higher than FR2.

[0183] Furthermore, the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

[0184] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0185] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0186] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0187] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0188] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0189] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0190] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0191] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0192] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0193] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0194] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0195] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0196] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0197] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0198] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted as DL-RS.

[0199] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as reference signals.

[0200] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0201] (base station) 15 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0202] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0203] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0204] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0205] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0206] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0207] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0208] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0209] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0210] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0211] The transceiver 120 (transmission processor 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0212] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0213] 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 .

[0214] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0215] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0216] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0217] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0218] The transceiver 120 may transmit downlink control information (DCI) indicating a transmission configuration indication (TCI) state applicable to the downlink and the uplink, and the control unit 110 may apply the TCI state at a timing based on the DCI.

[0219] (user terminal) 16 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0220] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0221] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0222] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.

[0223] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured from a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0224] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0225] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0226] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0227] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0228] The transceiver 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0229] The transceiver 220 (transmission processor 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0230] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0231] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0232] 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.

[0233] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0234] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0235] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0236] The transceiver 220 may receive downlink control information (DCI) indicating a transmission configuration indication (TCI) state applicable to the downlink and the uplink, and the controller 210 may apply the TCI state at a timing based on the DCI.

[0237] The control unit 210 may apply a default TCI state to reception from reception of the DCI until the timing.

[0238] The control unit 210 may apply the TCI state to a specific control resource set at the timing.

[0239] The control unit 210 may apply the TCI state to a first channel at a first timing, and may apply the TCI state to a second channel at a second timing after the first timing.

[0240] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0241] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As mentioned above, the implementation method of each is not particularly limited.

[0242] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 17 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0243] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0244] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0245] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0246] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0247] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0248] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0249] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0250] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0251] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0252] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0253] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0254] (Variation) Note that terms explained in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0255] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0256] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0257] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0258] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0259] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0260] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0261] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. However, the definition of TTI is not limited to this.

[0262] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0263] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0264] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0265] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0266] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0267] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0268] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0269] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0270] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0271] The BWP may include an UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0272] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0273] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0274] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0275] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0276] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0277] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0278] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0279] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0280] Note that the physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be called an RRC message, such as an RRC connection setup message or an RRC connection reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0281] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0282] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0283] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0284] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0285] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0286] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0287] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0288] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0289] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0290] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0291] 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 object, or the mobile object itself. The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0292] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0293] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0294] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0295] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the specific order presented.

[0296] Each aspect / embodiment described in the present disclosure may be related to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use 802.20, Ultra-Wide Band (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on and extend these systems. Furthermore, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0297] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0298] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0299] The term "determining," as used in this disclosure, may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0300] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0301] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0302] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0303] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0304] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0305] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0306] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0307] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0308] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0309] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. a receiver for receiving downlink control information (DCI) indicating a transmission configuration indication (TCI) state applicable to a downlink and an uplink; a control unit that applies the TCI state from a timing after reception of a downlink shared channel (PDSCH) scheduled by the DCI and transmission of an ACK corresponding to the PDSCH; The control unit controls transmission of an uplink control channel (PUCCH) including the ACK corresponding to reception of the PDSCH using another TCI state indicated before the TCI state indicated by the DCI, The terminal is characterized in that the control unit does not apply the TCI state to CORESET0.

2. 2. The terminal according to claim 1, wherein the receiving unit further receives a list including a plurality of TCI states applicable to a downlink and an uplink, and receives a Medium Access Control Element (MAC CE) that activates one or more TCI states including the TCI state in the list.

3. The terminal of claim 2 , further comprising: a transmitter for transmitting capability information indicating a maximum number of the one or more TCI states activated by the MAC CE.

4. receiving downlink control information (DCI) indicating transmission configuration indication (TCI) states applicable to downlink and uplink; applying the TCI state from a timing after reception of a downlink shared channel (PDSCH) scheduled by the DCI and transmission of a corresponding ACKnowledgement (ACK); and performing control to transmit an uplink control channel (PUCCH) including the ACK corresponding to the reception of the PDSCH using another TCI state indicated before the TCI state indicated by the DCI, The wireless communication method for a terminal, wherein the applying step does not apply the TCI state to CORESET0.

5. a transmitter for transmitting Downlink Control Information (DCI) indicating a Transmission Configuration Indication (TCI) state applicable to a downlink and an uplink; a control unit that controls, by transmitting the DCI, to apply the TCI state to the terminal from a timing after the terminal transmits an ACK corresponding to a downlink shared channel (PDSCH) scheduled by the DCI, the control unit controls reception of an uplink control channel (PUCCH) transmitted from the terminal using another TCI state indicated before the TCI state indicated by the DCI, the PUCCH including the ACK corresponding to reception of the PDSCH in the terminal; The base station, wherein the TCI state does not apply to CORESET0.

6. A system including a terminal and a base station, The terminal a receiver for receiving downlink control information (DCI) indicating a transmission configuration indication (TCI) state applicable to a downlink and an uplink; a control unit that applies the TCI state from a timing after reception of a downlink shared channel (PDSCH) scheduled by the DCI and transmission of an ACK corresponding to the PDSCH; The control unit controls transmission of an uplink control channel (PUCCH) including the ACK corresponding to reception of the PDSCH using another TCI state indicated before the TCI state indicated by the DCI, The control unit does not apply the TCI state to CORESET0, The base station A system comprising a transmitter that transmits the DCI.

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