Terminal, wireless communication method and system

Abstract

A terminal according to one embodiment of the present disclosure includes: a receiving unit that receives information indicating a first transmission configuration indicator (TCI) state among multiple TCI states; and a control unit that measures a first channel state information reference signal (CSI-RS) corresponding to the first TCI state based on an association between the TCI state and the CSI-RS. According to one embodiment of the present disclosure, information related to QCL can be appropriately determined.

Description

Technical Field

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

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized to achieve even higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) has been standardized to further enhance the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Releases (Rel.) 8 and 9).

[0003] Successor systems to LTE (e.g., also known as the fifth generation mobile communication system (5G), 5G+ (plus), the sixth generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

[0006] 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

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (e.g., NR), research is underway to enable user terminals (terminal, user terminal, User Equipment (UE)) to control transmission and reception processing based on information related to Quasi-Co-Location (QCL) (QCL assumption / Transmission Configuration Indication (TCI) status / spatial relationship).

[0009] However, there are cases where the information related to QCL is unclear. If the information related to QCL is unclear, it may lead to a decrease in communication quality, a decrease in throughput, etc.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately determine information related to QCL.

[0011] Means for solving problems

[0012] A terminal involved in one embodiment of the present disclosure comprises: a receiving unit, which receives information indicating a first transmission configuration indication (TCI) state among multiple TCI states; and a control unit, which measures a first CSI-RS corresponding to the first TCI state based on an association between the TCI state and a channel state information reference signal (CSI-RS).

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, information related to QCL can be appropriately determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a diagram showing an example of a unified TCI framework.

[0016] Figure 2 This is a diagram showing an example of a notification method for a unified TCI status.

[0017] Figure 3 This is a diagram showing an example of a method for determining the TCI state according to the first embodiment.

[0018] Figure 4A as well as Figure 4B This is a diagram showing an example of a method for determining the TCI state according to the second embodiment.

[0019] Figure 5 This is a diagram showing an example of a method for determining the TCI state according to the first modification of the second embodiment.

[0020] Figure 6This is a diagram showing an example of a method for determining the TCI state according to Modification 2 of the second embodiment.

[0021] Figure 7 This is a diagram showing an example of common beam updating according to Example 3-1.

[0022] Figure 8 This is a diagram showing an example of common beam updating according to Example 3-2.

[0023] Figure 9 This is a diagram showing an example of common beam updating according to Example 3-3.

[0024] Figure 10 This is a diagram showing an example of common beam updating according to method 3-4.

[0025] Figure 11 This is a diagram showing an example of common beam updating according to method 3-5.

[0026] Figure 12 This is a diagram showing an example of common beam updating according to method 3-6.

[0027] Figure 13 This is a diagram showing an example of activation / deactivation of CSI-RS / TRS according to the fourth embodiment.

[0028] Figure 14A as well as Figure 14B This is a diagram showing another example of activation / deactivation of CSI-RS / TRS according to the fourth embodiment.

[0029] Figure 15 This is a diagram showing an example of timing related to CSI-RS / TRS according to the fifth embodiment.

[0030] Figure 16 This is a diagram showing another example of timing related to CSI-RS / TRS according to the fifth embodiment.

[0031] Figure 17A as well as Figure 17B This is a diagram showing an example of scheduling restrictions according to the sixth embodiment.

[0032] Figure 18 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0033] Figure 19 This is a diagram showing an example of the configuration of a base station according to one embodiment.

[0034] Figure 20 This is a diagram showing an example of the configuration of a user terminal according to an embodiment.

[0035] Figure 21 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment. DETAILED DESCRIPTION

[0036] (TCI, spatial relationship, QCL)

[0037] In NR, research is being conducted on: 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 the control signals and channels (expressed as signal / channel) based on the transmission configuration indication state (TCI state).

[0038] The TCI state may also indicate the state of a signal / channel applied to a downlink. A state equivalent to the TCI state applied to a signal / channel applied to an uplink may also be expressed as a spatial relation.

[0039] The TCI status refers to information related to Quasi-Co-Location (QCL) of signals / channels, and may also be referred to as spatial reception parameters, spatial relationship information, etc. The TCI status may also be set for each channel or each signal in the UE.

[0040] QCL is an indicator that represents the statistical properties of a signal / channel. For example, when a signal / channel is in a QCL relationship with another signal / channel, it can also mean that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameters (e.g., spatial Rx parameters) can be assumed to be the same among these different signals / channels (at least one of these is QCL).

[0041] In addition, the spatial reception parameter may also correspond to the UE's receive beam (e.g., receive analog beam), and the beam may also be determined based on spatial QCL. The QCL (or at least one element of QCL) in the present disclosure may also be replaced with sQCL (spatial QCL).

[0042] QCLs can also be specified in multiple types (QCL types). For example, four QCL types AD can be set that can assume the same parameters (or parameter sets) but with different parameters. The parameters (also referred to as QCL parameters) are represented below:

[0043] QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0044] QCL type B (QCL-B): Doppler shift and Doppler spread,

[0045] QCL type C (QCL-C): Doppler shift and average delay,

[0046] QCL type D (QCL-D): spatial reception parameters.

[0047] The UE's assumption that a certain Control Resource Set (CORESET), channel, or reference signal has a specific QCL (e.g., QCL type D) relationship with other CORESETs, channels, or reference signals may also be referred to as a QCL assumption.

[0048] The UE may also determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI status or QCL assumption of the signal / channel.

[0049] The TCI status may also be information related to the QCL of the target channel (in other words, the reference signal (RS) used for the channel) and other signals (for example, other RS). The TCI status may also be set (indicated) through higher layer signaling, physical layer signaling, or a combination thereof.

[0050] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI))).

[0051] 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)).

[0052] In addition, the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called QRS).

[0053] The SSB is a signal block that includes at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel (physical broadcast channel (PBCH)). The SSB may also be referred to as an SS / PBCH block.

[0054] The RS of QCL type X in the TCI state may also mean an RS having a QCL type X relationship with a certain channel / signal (DMRS), and the RS may also be called a QCL source of QCL type X in the TCI state.

[0055] (Path loss RS)

[0056] Path loss PL in transmission power control of each of PUSCH, PUCCH, and SRS b，f，c (q d) [dB] Index q of the reference signal (RS, Pathloss Reference RS) for the downlink BWP associated with the activated UL BWP b of carrier f of serving cell c d , calculated by the UE. In this disclosure, the path loss reference RS, pathloss (PL)-RS, index q d , RS used in path loss calculation, and RS resources used in path loss calculation can also be replaced with each other. In the present disclosure, calculation, estimation, measurement, and tracking can also be replaced with each other.

[0057] When the path loss RS is updated via MAC CE, the existing mechanism of higher layer filtered RSRP used for path loss measurement is being studied.

[0058] When the Path Loss RS is updated via a MAC CE, path loss measurement based on L1-RSRP can also be applied. At available timing after a MAC CE for updating the Path Loss RS, the higher-layer filter RSRP can also be used for path loss measurement, and L1-RSRP is used for path loss measurement before applying the higher-layer filter RSRP. At available timing after a MAC CE for updating the Path Loss RS, the higher-layer filter RSRP can also be used for path loss measurement, and the higher-layer filter RSRP of the previous Path Loss RS is used before that timing. Similar to the operation in Rel. 15, the higher-layer filter RSRP is used for path loss measurement, and the UE can track all Path Loss RS candidates configured via RRC. The maximum number of Path Loss RSs that can be configured via RRC can also depend on UE capabilities. When the maximum number of Path Loss RSs that can be configured via RRC is X, fewer than X Path Loss RS candidates can be configured via RRC, and a Path Loss RS can be selected from these configured Path Loss RS candidates via a MAC CE. The maximum number of Path Loss RSs that can be configured via RRC can also be 4, 8, 16, 64, etc.

[0059] In the present disclosure, high-layer filter RSRP, filtered RSRP, and layer 3 filter RSRP (layer3filteredRSRP) may also be used interchangeably.

[0060] (Default TCI status / default spatial relationship / default PL-RS)

[0061] In RRC connected mode, in both cases where the TCI information in the DCI (higher layer parameter TCI-PresentInDCI) is set to "valid (enabled)" and when the TCI information in the DCI is not set, if the time offset between the reception of the DL DCI (DCI scheduling the PDSCH) and the corresponding PDSCH (the PDSCH scheduled by the DCI) is less than a threshold (timeDurationForQCL) (applicable condition, first condition), then 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 timeslot within the active DL BWP of the CC (for 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 within the active DL BWP of the scheduled CC.

[0062] In Rel. 15, separate MAC CEs are required for activating / deactivating the PUCCH spatial relationship and activating / deactivating the SRS spatial relationship. The PUSCH spatial relationship follows the SRS spatial relationship.

[0063] In Rel. 16, at least one of the MAC CE for activation / deactivation of the PUCCH spatial relationship and the MAC CE for activation / deactivation of the SRS spatial relationship may not be used.

[0064] If both the spatial relationship and PL-RS for the PUCCH are not configured in FR2 (application condition, second condition), the default assumptions for the spatial relationship and PL-RS (default spatial relationship and default PL-RS) are applied to the PUCCH. If both the spatial relationship and PL-RS for the SRS (SRS resources for the SRS, or SRS resources corresponding to the SRI in DCI format 0_1 ​​scheduling the PUSCH) are not configured in FR2 (application condition, second condition), the default assumptions for the spatial relationship and PL-RS (default spatial relationship and default PL-RS) are applied to the PUSCH and SRS scheduled in DCI format 0_1.

[0065] If a CORESET is configured in the active DL BWP on the CC (applicable conditions), the default spatial relationship and default PL-RS may also 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 the active DL BWP on the CC, the default spatial relationship and default PL-RS may also be the activated TCI state with the lowest ID of the PDSCH in the active DL BWP.

[0066] In Rel.15, the spatial relationship of the PUSCH scheduled using DCI format 0_0 follows the spatial relationship of the PUCCH resource with the lowest PUCCH resource ID in the activated spatial relationship of the PUCCH on the same CC. Even if the PUCCH is not transmitted on the SCell, the network needs to update the PUCCH spatial relationship on all SCells.

[0067] In Rel. 16, PUCCH configuration is not required for PUSCHs scheduled using DCI format 0_0. For PUSCHs scheduled using DCI format 0_0, if there is no activated PUCCH spatial relation or no PUCCH resources on the activated UL BWP within the CC (application condition, second condition), the default spatial relation and default PL-RS are applied to the PUSCH.

[0068] The application conditions for the default spatial relationship / default PL-RS for SRS may also include the default beam path loss activation information element for SRS (higher-layer parameter enableDefaultBeamPlForSRS) being set to valid. The application conditions for the default spatial relationship / default PL-RS for PUCCH may also include the default beam path loss activation information element for PUCCH (higher-layer parameter enableDefaultBeamPlForPUCCH) being set to valid. The application conditions for the default spatial relationship / default PL-RS for PUSCH scheduled via DCI format 0_0 may also include the default beam path loss activation information element for PUSCH scheduled via DCI format 0_0 (higher-layer parameter enableDefaultBeamPlForPUSCH0_0) being set to valid.

[0069] The above-mentioned threshold may also be referred to as time duration for QCL, "timeDurationForQCL", "threshold", "threshold for offset between a DCI indicating a TCIstate and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset", scheduling offset threshold, scheduling offset threshold, etc.

[0070] (Multiple TRP)

[0071] In NR, one or more Transmission / Reception Points (TRPs) (multi TRPs (MTRPs)) are being studied for downlink transmissions to a UE using one or more panels (multi-panels). In addition, the use of one or more panels for uplink transmissions by a UE to one or more TRPs is being studied.

[0072] In addition, multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0073] Multiple TRPs (e.g., TRP#1 and TRP#2) can be connected via an ideal / non-ideal backhaul to exchange information and data. Different code words (CWs) and different layers can also be transmitted from each TRP in the multiple TRPs. Non-coherent joint transmission (NCJT) can also be used as a method for transmitting multiple TRPs.

[0074] In NCJT, for example, TRP#1 performs modulation mapping on a first codeword and layer mapping to transmit a first PDSCH using a first precoding method for a first number of layers (e.g., two layers). Furthermore, TRP#2 performs modulation mapping on a second codeword and layer mapping to transmit a second PDSCH using a second precoding method for a second number of layers (e.g., two layers).

[0075] In addition, multiple PDSCHs (multi-PDSCHs) being NCJTed may also be defined to partially or completely overlap with respect to at least one of the time domain and the frequency domain. That is, at least one of the time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP may also overlap.

[0076] These first PDSCHs and second PDSCHs may also be considered not to be quasi-co-located. Reception of multiple PDSCHs may also be replaced by simultaneous reception of PDSCHs that are not of a certain QCL type (eg, QCL type D).

[0077] Multiple PDSCHs from multiple TRPs (also referred to as multiple PDSCHs) can also be scheduled using one DCI (single DCI, single PDCCH) (single-master mode, single-DCI based multi-TRP). Multiple PDSCHs from multiple TRPs can also be scheduled separately using multiple DCIs (multiple DCIs, multiple PDCCHs) (multiple-master mode, multi-TRP based multi-DCI).

[0078] Based on such a multi-TRP scenario, more flexible transmission control using channels of good quality can be performed.

[0079] In order to support the transmission of multiple TRPs within a cell (intra-cell, with the same cell ID) and between cells (inter-cell, with different cell IDs) based on multiple PDCCHs, in the RRC setting information for linking multiple pairs of PDCCHs and PDSCHs with multiple TRPs, a control resource set (CORESET) in the PDCCH setting information (PDCCH-Config) can also correspond to one TRP.

[0080] (CSI)

[0081] In NR, the UE uses a reference signal (or the resources used for the reference signal) to measure the channel state and feeds back (reports) the channel state information (CSI) to the network (e.g., the base station).

[0082] The UE may also use at least one of the Channel State Information Reference Signal (CSI-RS), the Synchronization Signal / Broadcast Channel (SS / PBCH) block, the Synchronization Signal (SS), the DeModulation Reference Signal (DMRS), etc. to measure the channel state.

[0083] The CSI-RS resources may also include at least one of non-zero power (NZP) CSI-RS resources, zero power (ZP) CSI-RS resources, and CSI interference measurement (CSI Interference Measurement (CSI-IM)) resources.

[0084] Resources used to measure signal components for CSI may also be referred to as signal measurement resources (SMR) or channel measurement resources (CMR). SMR (CMR) may also include, for example, NZP CSI-RS resources and SSBs used for channel measurement.

[0085] The resources used to measure interference components for CSI may also be referred to as Interference Measurement Resources (IMR). The IMR may include, for example, at least one of NZP CSI-RS resources, SSBs, ZP CSI-RS resources, and CSI-IM resources used for interference measurement.

[0086] The SS / PBCH block is a block that includes synchronization signals (for example, the primary synchronization signal (PSS), the secondary synchronization signal (SSS))) and the PBCH (and the corresponding DMRS), and may also be referred to as an SS block (SSB), etc.

[0087] In addition, CSI may also include at least one of a channel quality indicator (Channel Quality Indicator (CQI)), a precoding matrix indicator (Precoding Matrix Indicator (PMI)), a CSI-RS resource indicator (CSI-RSResource Indicator (CRI)), a SS / PBCH block resource indicator (SS / PBCH Block Resource Indicator (SSBRI)), a layer indicator (Layer Indicator (LI)), a rank indicator (Rank Indicator (RI)), L1-RSRP (Layer 1 Reference Signal Received Power), L1-RSRQ (Reference Signal Received Quality), L1-SINR (Signal to Interference plus Noise Ratio), and L1-SNR (Signal to Noise Ratio).

[0088] CSI may include 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.

[0089] Furthermore, CSI can be categorized into several CSI types. The type and size of reported information can also vary depending on the CSI type. For example, a CSI type configured for communication using a single beam (also referred to as type 1 CSI, single-beam CSI, etc.) and a CSI type configured for communication using multiple beams (also referred to as type 2 CSI, multi-beam CSI, etc.) can be specified. The uses of CSI types are not limited to these.

[0090] As CSI feedback methods, periodic CSI (P-CSI) reporting, aperiodic CSI (A-CSI, AP-CSI) reporting, semi-persistent CSI (SP-CSI) reporting, etc. are being studied.

[0091] The UE may also be notified of the CSI measurement configuration information using higher layer signaling, physical layer signaling, or a combination thereof.

[0092] 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.

[0093] MAC signaling may also use, for example, MAC Control Element (MAC CE) and MAC Protocol Data Unit (MAC PDU). Broadcast information may also include, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), and Other System Information (OSI).

[0094] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI))).

[0095] CSI measurement configuration information may also be configured using, for example, the RRC information element "CSI-MeasConfig." The CSI measurement configuration information may also include CSI resource configuration information (RRC information element "CSI-ResourceConfig"), CSI reporting configuration information (RRC information element "CSI-ReportConfig"), and other information. The CSI resource configuration information is associated with the resources used for CSI measurement, and the CSI reporting configuration information is associated with how the UE implements CSI reporting.

[0096] The RRC information elements (or RRC parameters) related to CSI reporting configuration and CSI resource configuration are described.

[0097] The CSI report configuration information ("CSI-ReportConfig") includes channel measurement resource information ("resourcesForChannelMeasurement"). Furthermore, the CSI report configuration information may also include interference measurement resource information (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.). This resource information corresponds to the ID (Identifier) ​​("CSI-ResourceConfigId") of the CSI resource configuration information.

[0098] In addition, one or more IDs of the CSI resource configuration information corresponding to each resource information (may also be referred to as CSI resource configuration ID) may be the same value or different values.

[0099] The CSI resource configuration information ("CSI-ResourceConfig") may also include the 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 also include at least one of the NZP CSI-RS and SSB information used for measurement ("nzp-CSI-RS-SSB") and CSI-IM resource set list information ("csi-IM-ResourceSetList").

[0100] The resource type indicates the time domain behavior of the resource setting, and can be set to "aperiodic", "semi-persistent", or "periodic". For example, the corresponding CSI-RS can also be called A-CSI-RS (AP-CSI-RS), SP-CSI-RS, and P-CSI-RS.

[0101] Furthermore, channel measurement resources may be used to calculate, for example, CQI, PMI, L1-RSRP, etc. Furthermore, interference measurement resources may be used to calculate L1-SINR, L1-SNR, L1-RSRQ, and other interference-related indices.

[0102] (Unified TCI framework)

[0103] Using the same TCI state in both UL and DL channels is under study.

[0104] exist Figure 1 In the example, the TCI state including DL-RS is used for the QCL assumption of PDCCH / PDSCH / CSI-RS, the spatial relationship of SRS / PUCCH, and the spatial relationship of PUSCH.

[0105] The use of RRC / MAC-CE / DCI in the selection of one TCI state for UL / DL is under study.

[0106] exist Figure 2 In the example, multiple unified TCI states for DL ​​are configured via RRC, and multiple unified TCI states for UL are configured via RRC. Each of the multiple unified TCI states for DL ​​and the multiple unified TCI states for UL may be an SSB, CSI-RS, or SRS.

[0107] Part of the unified TCI state for DL ​​configured via RRC is activated as the unified TCI state for DL ​​via MAC CE. Part of the unified TCI state for DL ​​configured via RRC is activated as the unified TCI state for UL via MAC CE. Part of the unified TCI state for UL configured via RRC is activated as the unified TCI state for UL via MAC CE. Part of the unified TCI state for DL ​​activated via MAC CE is indicated via DCI. Part of the unified TCI state for UL activated via MAC CE is indicated via DCI.

[0108] The unified TCI framework enables control of both UL and DL channels through a common framework. Unlike Rel. 15, which specifies TCI states or spatial relationships for each channel, the unified TCI framework allows for the designation of a common beam and its application to all UL and DL channels, or for the application of a common beam for UL to all UL channels and a common beam for DL ​​to all DL channels.

[0109] The relationship between CSI-RS / TRS measurement and other channels is unclear. For example, CSI-RS / TRS RS overhead and scheduling restrictions for other channels with different QCL Type D are issues. Unclear CSI-RS / TRS measurement and its relationship with other channels can lead to degraded communication quality and throughput.

[0110] Therefore, the inventors of the present invention have considered operations related to CSI-RS.

[0111] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the respective embodiments may be applied individually or in combination.

[0112] In the present disclosure, "A / B / C" and "at least one of A, B, and C" are interchangeable. In the present disclosure, cell, CC, carrier, BWP, DL BWP, UL BWP, activated DL BWP, activated UL BWP, and band are interchangeable. In the present disclosure, index, ID, indicator, and resource ID are interchangeable. In the present disclosure, support, control, controllable, operate, and operate are interchangeable.

[0113] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be used interchangeably.

[0114] In the present disclosure, MAC CE and activation / deactivation command may also be replaced with each other.

[0115] In the present disclosure, the term "high-layer signaling" may also refer to, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof. In the present disclosure, the terms "RRC," "RRC signaling," "RRC parameter," "high-layer," "high-layer parameter," "RRC Information Element (IE)," and "RRC message" may also be used interchangeably.

[0116] MAC signaling may also use, for example, MAC Control Element (MAC CE) and MAC Protocol Data Unit (MAC PDU). Broadcast information may also include, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), and Other System Information (OSI).

[0117] In the present disclosure, 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 of QCL type D according to TCI state / QCL assumption, RS of QCL type A according to 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 also be used interchangeably. In the present disclosure, 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 also be used interchangeably.

[0118] UL DCI, DCI for scheduling UL channels (PUSCH), and DCI formats 0_x (x=0, 1, 2, ...) can also be replaced with each other. DL DCI, DCI for scheduling DL channels (PDSCH), and DCI formats 1_x (x=0, 1, 2, ...) can also be replaced with each other.

[0119] In the present disclosure, HARQ-ACK information, ACK, and NACK may also be used interchangeably.

[0120] In the present disclosure, single TRP, single TRP system, single TRP transmission, and single PDSCH are interchangeable. In the present disclosure, multiple TRPs, multiple TRP systems, multiple TRP transmissions, and multiple PDSCHs are interchangeable. In the present disclosure, single DCI, single PDCCH, multiple TRPs based on a single DCI, and two TCI states activated on at least one TCI code point are interchangeable.

[0121] In the present disclosure, a single TRP, a channel using a single TRP, a channel using one TCI state / spatial relationship, multiple TRPs not activated through RRC / DCI, multiple TCI states / spatial relationships not activated through RRC / DCI, a CORESET pool index (CORESETPoolIndex) value not set to 1 for any CORESET, and any code point of the TCI field not mapped to two TCI states can also be replaced with each other.

[0122] In the present disclosure, multiple TRPs, channels using multiple TRPs, channels using multiple TCI states / spatial relationships, multiple TRPs activated through RRC / DCI, multiple TCI states / spatial relationships activated through RRC / DCI, multiple TRPs based on a single DCI, and at least one of multiple TRPs based on multiple DCIs may also be replaced with each other. In the present disclosure, multiple TRPs based on multiple DCIs and a CORESET pool index (CORESETPoolIndex) value set to 1 for a CORESET may also be replaced with each other. In the present disclosure, multiple TRPs based on a single DCI and at least one code point of a TCI field mapped to two TCI states may also be replaced with each other.

[0123] In the present disclosure, 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 (high-layer parameter trs-Info), and NZP CSI-RS resources within an NZP CSI-RS resource set with TRS information may also be used interchangeably. In the present disclosure, CSI-RS resources, CSI-RS resource sets, CSI-RS resource groups, and information elements (IEs) may also be used interchangeably.

[0124] (Wireless Communication Method)

[0125] In the present disclosure, pool, set, group, and list can also be used interchangeably.

[0126] In the present disclosure, common beams, unified TCI states, beams applicable in DL and UL, beams applied in multiple channels, and PL-RS can also be replaced with each other.

[0127] <First embodiment>

[0128] The UE may also assume the same TCI state pool for UL and DL.

[0129] RRC (parameters, information elements) can also set multiple TCI states (pools) for UL / DL channels.

[0130] The MAC CE may also select (activate) more than one (eg, multiple) TCI states (sets) for the UL / DL channel.

[0131] The UL / DL DCI may also select (indicate) more than one (e.g., one) TCI state. The TCI state may also be applied to multiple UL / DL channels. The UL / DL channels may also be PDCCH / PDSCH / PUSCH / SRS / PUCCH.

[0132] The UL / DL DCI may also include a new TCI field. The UL / DL DCI may also be at least one of DCI formats 0_1, 0_2, 1_1, and 1_2. The new TCI field may also select at least one (e.g., one) of multiple activated TCI states.

[0133] When 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.

[0134] The new TCI field in the DCI can also be configured by higher layers. The new DCI field in the UL DCI and the new DCI field in the DL DCI can also be configured independently (separately). The new DCI field in the UL DCI and the new DCI field in the DL DCI can also be configured jointly.

[0135] The size (number of bits) of the TCI field may be the same or different in UL DCI and DL DCI. For example, the size of the TCI field in DL DCI may be larger than the size of the TCI field in UL DCI.

[0136] exist Figure 3 In this example, RRC configures multiple TCI states for DL ​​and UL. Each of the multiple TCI states can also be an SSB, CSI-RS, or SRS. The MAC CE activates some of the configured multiple TCI states. The DCI indicates at least one of the multiple activated TCI states.

[0137] The indicated TCI state is applied to multiple UL / DL channels. UL / DL channels may also be PDCCH / PDSCH / PUSCH / SRS / PUCCH.

[0138] MAC CE-based beam management can also be used to align the default UL and DL beams. The default TCI state of the PDSCH can also be updated to match the default UL beam (spatial relationship).

[0139] DCI-based beam management can also be used to indicate a common beam / unified TCI state for both UL and DL from the same TCI state pool. M (>1) TCI states can also be activated via MAC CE. UL / DL DCI can also select one of the M activated TCI states. The selected TCI state can also be applied to both UL and DL channels / RSs.

[0140] According to the first embodiment described above, the TCI state set in one pool can be used for UL and DL channels.

[0141] <Second embodiment>

[0142] The UE may also assume different TCI state pools for each of UL and DL.

[0143] RRC (parameters, information elements) may also configure multiple TCI states (pools) for each UL and DL channel.

[0144] The MAC CE may select (activate) more than one (eg, multiple) TCI states (sets) for each of the UL and DL channels. The MAC CE may also activate two sets of TCI states.

[0145] A single MAC CE format may be specified for both DL and UL traffic. A single MAC CE (sent once) may represent two sets of TCI states. The two sets of TCI states may be for DL ​​and UL traffic, respectively. Two MAC CEs (sent twice) may represent a set of TCI states for DL ​​and a set of TCI states for UL, respectively. Each MAC CE may also include a 1-bit field indicating whether it is for DL ​​or UL traffic.

[0146] Different MAC CE formats may also be specified for DL ​​and UL.

[0147] The DL DCI may also select (indicate) more than one (eg, one) TCI state. The TCI state may also be applied to more than one DL channel. The DL channel may also be PDCCH / PDSCH / CSI-RS.

[0148] The UL DCI selects (indicates) one or more (e.g., one) TCI states. The TCI states may also be applied to one or more UL channels. The UL channels may also be PUSCH / SRS / PUCCH.

[0149] The UL / DL DCI may also include a new TCI field. The UL / DL DCI may also be at least one of DCI formats 0_1, 0_2, 1_1, and 1_2. The new TCI field may also select at least one (e.g., one) of multiple activated TCI states.

[0150] If the new TCI field exists in DCI formats 1_1 and 1_2, the Rel.15 / 16 TCI field 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.

[0151] The new TCI field in the DCI can also be configured by higher layers. The new DCI field in the UL DCI and the new DCI field in the DL DCI can also be configured independently (separately). The new DCI field in the UL DCI and the new DCI field in the DL DCI can also be configured jointly.

[0152] The size (number of bits) of the TCI field may be the same or different in UL DCI and DL DCI. For example, the size of the TCI field in DL DCI may be larger than the size of the TCI field in UL DCI.

[0153] At least one of the presence and size of the TCI field in the DCI may also be determined by the number of TCI states activated by the MAC CE.

[0154] exist Figure 4A In the example, RRC configures multiple TCI states for DL. Each TCI state may also be SSB, CSI-RS, or SRS. The MAC CE activates multiple DL TCI states from the configured multiple DL TCI states. The DL DCI indicates at least one of the multiple activated DL TCI states. The indicated DL TCI state is applied to the DL channel. The DL channel may also be CSI-RS / PDCCH / PDSCH.

[0155] exist Figure 4B In the example, RRC configures multiple TCI states for the UL. Each TCI state may also be an SSB, CSI-RS, or SRS. The MAC CE activates multiple UL TCI states from the configured multiple UL TCI states. The UL DCI indicates at least one of the multiple activated UL TCI states. The indicated UL TCI state is applied to the UL channel. The UL channel may also be a PUCCH / PUSCH.

[0156] Modification 1

[0157] The RRC may configure a pool of TCI states common to both UL and DL, and may activate one or more TCI states for DL ​​and one or more TCI states for UL from the common pool.

[0158] exist Figure 5 In the example, RRC sets multiple TCI states for DL ​​and UL. Each TCI state can also be SSB, CSI-RS or SRS.

[0159] The first MAC CE activates multiple TCI states for DL ​​among the configured multiple TCI states. The DL DCI indicates at least one of the multiple activated DL TCI states. The indicated DL TCI state is applied to the DL channel. The DL channel may also be a CSI-RS / PDCCH / PDSCH.

[0160] The second MAC CE activates multiple TCI states for UL among the configured multiple TCI states. The UL DCI indicates at least one of the multiple activated TCI states for UL. The indicated UL TCI state is applied to the UL channel. The UL channel may also be a PUCCH / PUSCH.

[0161] Modification 2

[0162] One or more DL TCI states and one or more UL TCI states may be independently indicated from a plurality of activated TCI states. UL DCI and DL DCI may also indicate different TCI states.

[0163] exist Figure 6 In the example, RRC sets multiple TCI states for DL ​​and UL. Each TCI state can also be SSB, CSI-RS, or SRS. MAC CE activates multiple TCI states among the set TCI states.

[0164] The DL DCI indicates at least one DL TCI state from among multiple activated TCI states. The indicated DL TCI state is applied to a DL channel. The DL channel may also be a CSI-RS / PDCCH / PDSCH.

[0165] The UL DCI indicates at least one UL TCI state from among multiple activated TCI states. The indicated UL TCI state is applied to a UL channel. The UL channel may also be a PUCCH / PUSCH.

[0166] According to the second embodiment described above, the TCI state for DL ​​and the TCI state for UL can be appropriately determined.

[0167] <Third embodiment>

[0168] The UE may also receive DCI indicating a unified / common TCI state and apply the indicated TCI state at the beam update timing based on the DCI.

[0169] The UE may also apply the indicated TCI state to the first channel (one or more channels / RSs / resources) at a first timing (timing #1). The UE may also apply the indicated TCI state to the second channel (one or more channels / RSs / resources) at a second timing (timing #2) after the first timing. The UE may also apply the indicated TCI state to the third channel (one or more channels / RSs / resources) at a third timing (timing #3) after the second timing.

[0170] The beam update timing may also follow at least one of the following methods 3-1 to 3-6.

[0171] Method 3-1

[0172] DCI can also update the common beam for DL ​​and UL at at least one of the following timings: reception of a scheduled PDSCH, transmission of the corresponding HARQ-ACK information, and transmission of a scheduled PUSCH. The beam update timing can also be the same as Rel.15.

[0173] The common beam can also be updated after a specific time from the last codeword received in the DCI. The specific time can also be K codewords or K time slots. K can be specified by the specification, set by higher layers, or reported by the UE as a UE capability.

[0174] exist Figure 7 In the example shown in Figure 2, the DCI indicates TCI state #2 among multiple activated TCI states. K symbols after the last symbol received in the DCI (timing #1), the UE updates the common beam to TCI state #2. Thereafter, TCI state #2 is used in the spatial relationship between the TCI state of the PDSCH reception and the PUCCH transmission containing the corresponding HARQ-ACK information. For this PUCCH TCI state, no new DCI field for the DCI-level beam indication is required.

[0175] Method 3-2

[0176] If DCI reception fails, the base station assumes that the common beam has been updated, while the UE assumes that the common beam has not been updated. If DCI reception for scheduling PDSCH fails, whether the base station can reschedule the PDSCH becomes a question.

[0177] When there is a possibility of retransmission of PDSCH / PUSCH, the UE may monitor DCI using the beam before update.

[0178] At the timing of PDSCH reception, in addition to DCI reception with the possibility of scheduled retransmission, the common beam assumption may also be updated.

[0179] Here, the problem is how to identify DCI that may be scheduled for retransmission.

[0180] The same CORESET / search space / QCL assumption / TCI state can also be used to schedule the initial transmission and retransmission of DCI.

[0181] Figure 8 In the example of DCI, PDSCH, PUCCH and Figure 7 In this example, at timing #1, all common beams are updated except for the CORESET scheduled for PDSCH (DCI with the possibility of scheduling retransmission), and at timing #2 after the UE sends the PUCCH containing the ACK or NACK corresponding to the PDSCH, the beam of the CORESET scheduled for PDSCH is updated to the common beam.

[0182] Method 3-3

[0183] Different beam updating timings may be applied to PDCCH and other channels.

[0184] The UE may also assume at least one of the following assumptions 1 to 4.

[0185] [Scenario 1]

[0186] 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.

[0187] [Scenario 2]

[0188] 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.

[0189] [Scenario 3]

[0190] When independent common beams are used for DL ​​and UL, the two TCI fields in DCI format 1_1 / 1_2 indicate the DL common beam and the UL common beam, respectively.

[0191] [Scenario 4]

[0192] When independent common beams are used for DL ​​and UL, the two TCI fields in DCI format 0_1 / 0_2 indicate the DL common beam and the UL common beam, respectively.

[0193] Figure 9 In the example of DCI, PDSCH, PUCCH and Figure 7 In this example, at timing #1, the common beam excluding the PDCCH is updated. At timing #2, the PDCCH beam is updated to the common beam.

[0194] Method 3-4

[0195] The indicated TCI state can also be used for PDSCH reception. This TCI state can also be indicated by the new TCI field. When the scheduling offset (time offset) between the DCI and the PDSCH scheduled by the DCI is less than a threshold (e.g., timeDurationForQCL), the default DL beam (TCI state) can also be applied for PDSCH reception (same as Rel.15).

[0196] For PUCCH, the indicated TCI state or the previous common TCI state or the set spatial relationship may also be applied.

[0197] In this case, there will be no beam deviation between the UE and the base station.

[0198] Figure 10 In the example of DCI, PDSCH, PUCCH and Figure 7 In this example, TCI state #2 indicated by DCI is applied to PDSCH reception, and after PUCCH transmission (timing #1), the common beam is updated.

[0199] Methods 3-5

[0200] After the UE sends the HARQ-ACK information, the common beam for all channels may also be updated. For the PDSCH, DCI-level beam update may not be performed.

[0201] To enable beam updates at the DCI level for PDSCH, the Rel.15 TCI field can be reused. The Rel.15 TCI field can also be applied only to scheduled PDSCHs. The new TCI field can also be applied to all channels.

[0202] Figure 11 In the example of DCI, PDSCH, PUCCH and Figure 7 In this example, after PUCCH transmission (timing #1), the common beam for all channels / RSs is updated.

[0203] Methods 3-6

[0204] At least one of methods 3-1 to 3-5 may also be applied to PUSCH. In at least one of methods 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.

[0205] Figure 12 This example illustrates the application of methods 3-4 to the PUSCH. In this example, the DCI indicates TCI state #2 among multiple activated 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.

[0206] According to the third embodiment described above, it is possible to make identification of DL / UL beams consistent between the UE and the base station.

[0207] <Fourth embodiment>

[0208] A common TCI state pool may also be set by a higher layer, and one or more unified / common TCI states may be activated (indicated).

[0209] The one or more unified / common TCI states may also be activated via a MAC CE. The one or more unified / common TCI states may also be indicated via a DCI. A set of unified / common TCI states may also be activated via a MAC CE, and the one or more unified / common TCI states may be indicated from the set via a DCI.

[0210] The one or more unified / common TCI states, the unified / common TCI state activated / indicated through MAC CE / DCI, the activated unified / common TCI state, the activated TCI state, and the activated TCI state may also be replaced with each other.

[0211] The UE may also receive information (MAC CE / DCI) indicating a first TCI state (more than one unified / common TCI state) among multiple TCI states (multiple unified / common TCI states).

[0212] A unified / common set of TCI states can also be activated for all channels in UL and DL. A unified / common set of TCI states can also be activated for UL. A unified / common set of TCI states can also be activated for DL.

[0213] The correspondence between the activated unified / common TCI state and the CSI-RS / TRS can be set by higher layers or specified in the specification. The correspondence can also associate the TCI state ID with the CSI-RS / TRS resource ID. The CSI-RS can also be at least one of P-CSI-RS, SP-CSI-RS, and A-CSI-RS.

[0214] The correspondence between the activated unified / common TCI state and the P-CSI-RS / TRS may not be explicitly notified. The TCI state corresponding to the CSI-RS / TRS may also be the RS set for the CSI-RS / TRS. For example, the TCI state corresponding to the CSI-RS / TRS may be either a QCL type D RS set as the TCI state for the CSI-RS / TRS, or an RS of all QCL types (e.g., QCL type A and QCL type D) set as the TCI state for the CSI-RS / TRS.

[0215] The UE may also measure the CSI-RS / TRS (first CSI-RS) corresponding to the activated unified / common TCI state (first TCI state). In the same codeword as the CSI-RS / TRS, there may also be a scheduling restriction for an RS / channel having a QCL type D different from that of the CSI-RS / TRS. The UE may also assume that, in the same codeword as the first CSI-RS, a channel / RS having a QCL type D different from that of the first CSI-RS (RS of QCL type D) is not received. Scheduling restrictions and channels / RS having a QCL type D different from that of the CSI-RS (RS of QCL type D) not being scheduled in the same codeword as the CSI-RS may also be interchangeable.

[0216] A UE that reports specific UE capabilities may also be able to simultaneously receive multiple channels / RSs with different QCL types D. Here, there may also be at least one restriction that the UE uses different UE panels to receive the multiple channels / RSs, the multiple channels / RSs correspond to different TRPs (CORESET pool indices), and the multiple channels / RSs correspond to different groups reported based on group beams. Scheduling restrictions for RSs / channels with different QCL types D in the same codeword as CSI-RS / TRS may also be specified in accordance with this restriction.

[0217] The UE may not measure the CSI-RS / TRS (second CSI-RS) corresponding to the deactivated unified / common TCI state (second TCI state). There may also be no scheduling restrictions for RS / channels having a different QCL type D from that of the CSI-RS / TRS in the same symbol as the CSI-RS / TRS. The UE may also receive a channel / RS having a QCL type D different from that of the second CSI-RS (QCL type D RS) in the same symbol as the second CSI-RS.

[0218] exist Figure 13 In the example of the first embodiment, the unified / common TCI state is activated. The P-CSI-RS / TRS corresponding to the activated unified / common TCI state is activated. The P-CSI-RS / TRS corresponding to the deactivated unified / common TCI state is deactivated.

[0219] In the example of FIG14 , using the second embodiment, the TCI states within the unified / common TCI state pool for UL and the TCI states within the unified / common TCI state pool for DL ​​are activated. The P-CSI-RS / TRS corresponding to the activated unified / common TCI state included in at least one of the unified / common TCI state pool for UL and the unified / common TCI state pool for DL ​​are activated. The P-CSI-RS / TRS corresponding to the deactivated unified / common TCI state (and the TCI state not included in both the unified / common TCI state pool for UL and the unified / common TCI state pool for DL) are deactivated.

[0220] According to the fourth embodiment described above, CSI-RS / TRS can be appropriately measured. In addition, by applying scheduling restrictions only to the codewords of CSI-RS / TRS corresponding to the activated TCI state, PDSCH and the like can be scheduled in more resources, and peak user throughput can be improved.

[0221] <Fifth embodiment>

[0222] At least one of the timing for requiring / not requiring (switching) CSI-RS / TRS reception and the timing for applying scheduling restrictions may be specified. Requiring CSI-RS / TRS reception, activating CSI-RS / TRS, and enabling CSI-RS / TRS measurement may also be interchangeable. Requiring CSI-RS / TRS reception, deactivating CSI-RS / TRS, and disabling CSI-RS / TRS measurement may also be interchangeable.

[0223] The timing when CSI-RS / TRS reception is required / not required and the timing when scheduling restriction is applied may be the same as or different from each other.

[0224] At least one of the timing of whether or not to receive CSI-RS / TRS and the timing to which scheduling restrictions are applied may be the same as or different from the common beam update timing.

[0225] The update timing of the common beam may also follow the third embodiment.

[0226] At least one of the timing of whether or not CSI-RS / TRS reception is required or not and the timing of when scheduling restrictions are applied may be the last update timing among multiple common beam update timings. The last update timing may also be the timing when the common beam for all channels is updated. Figure 15 In the example of DCI, PDSCH, PUCCH and Figure 7 In this example, at timing #1, the common beam for channels other than the PDCCH is updated, and at timing #2, the PDCCH beam is updated to the common beam. Timing #2 may also be at least one of the timings for requiring or not requiring CSI-RS / TRS reception and the timing for which scheduling restrictions are applied.

[0227] At least one of the timing of whether or not CSI-RS / TRS reception is required or not, and the timing of when scheduling restrictions are applied, may also be a specific time after the last update timing among multiple common beam update timings. The specific time may also be K symbols or K slots. K may be specified in the specification, set by higher layers, or reported by the UE as a UE capability. Figure 16 In the example of DCI, PDSCH, PUCCH and Figure 7 Same. In this example, at timing #1, the common beam for channels other than the PDCCH is updated, and at timing #2, the PDCCH beam is updated to the common beam. At least one of the timing for requiring / not requiring CSI-RS / TRS reception and the timing for applying scheduling restrictions may be timing #3, K symbols after timing #2.

[0228] According to the fifth embodiment described above, CSI-RS / TRS can be appropriately measured, and scheduling restrictions can be appropriately applied.

[0229] <Sixth embodiment>

[0230] In Rel.15 / 16, if P-CSI-RS / TRS resources and TCI status are set through RRC in FR2, the peak UE throughput is reduced due to scheduling limitations / availability of PDSCH with different QCL assumptions on the same codeword as P-CSI-RS / TRS.

[0231] exist Figure 17A In this example, the PDSCH TCI state is TCI #3. The P-CSI-RS resources in symbols #1 through #8 have TCIs #1 through #8, respectively. In Rel. 15, only symbol #3, which has the same TCI state, can be used in the PDSCH. Symbols #1, #2, and #4 through #8, which have different TCI states, cannot be used in the PDSCH. This reduces the number of symbols that can be used in the PDSCH.

[0232] In the unified TCI state for DL ​​and DL common beam, whether the UE continues to monitor the P-CSI-RS / TRS corresponding to the deactivated unified TCI state becomes an issue.

[0233] When the UE does not monitor the P-CSI-RS / TRS corresponding to the deactivated unified TCI state, there can be no scheduling restrictions on the PDSCH with different QCL assumptions on the same codeword as the P-CSI-RS / TRS. This can improve the peak UE throughput.

[0234] exist Figure 17B In the example, only the P-CSI-RS resource for symbol #3 is activated, and the P-CSI-RS resources for symbols #1, #2, #4 to #8 are deactivated. Symbols #1 to #8 can be used in the PDSCH. More symbols can be used in the PDSCH.

[0235] Sometimes, problems arise because all CSI-RS / TRS corresponding to the deactivated unified / common TCI state are deactivated (the UE does not measure these CSI-RS / TRS and there are no scheduling restrictions for these CSI-RS / TRS). For example, in layer 3 (L3) measurements (CSI-RS / SSB for mobility and handover purposes), even if the unified TCI state of the cell is deactivated, measurements are still required.

[0236] Therefore, all CSI-RS / TRS corresponding to the deactivated unified / common TCI state are deactivated (the UE does not measure the CSI-RS / TRS and there are no scheduling restrictions for the CSI-RS / TRS), and may not be applied to a specific purpose. The specific purpose may also be mobility / handover purposes.

[0237] In inter-cell beam management, studies are underway to allow UEs to measure the CSI-RS / SSBs of other cells (cells with different physical cell IDs (PCIs)). The UE may also measure the CSI-RS / TRS / SSBs associated with the TCI states of other cells, regardless of whether the corresponding unified TCI state is activated or deactivated. The UE may also measure the CSI-RS / TRS / SSBs associated with the TCI states of other cells only when the corresponding unified TCI state is activated.

[0238] According to the sixth embodiment described above, measurement for a specific application can be appropriately performed.

[0239] <Seventh embodiment>

[0240] A UE capability corresponding to at least one function (feature) in the first to sixth embodiments may also be specified. If the UE reports the UE capability, the UE may also perform the corresponding function. If the UE reports the UE capability and a higher-layer parameter corresponding to the function is set, the UE may also perform the corresponding function. A higher-layer parameter (RRC information element) corresponding to the function may also be specified. If the higher-layer parameter is set, the UE may also perform the corresponding function.

[0241] UE capability may also indicate whether the UE supports the function.

[0242] The UE capability may also indicate the maximum number of TCI states supported by the UE, configured via RRC. The maximum number of TCI states configured via RRC may also be the maximum number of TCI states configured for both UL and DL. The maximum number of TCI states configured via RRC may also be reported independently for the maximum number of TCI states configured for UL and the maximum number of TCI states configured for DL.

[0243] The UE capability may also indicate the maximum number of activated TCI states supported by the UE. The maximum number of activated TCI states may also be the maximum number of activated TCI states for both UL and DL. The maximum number of activated TCI states may also be reported separately for the maximum number of activated TCI states for UL and the maximum number of activated TCI states for DL.

[0244] The UE capability may also indicate whether the UE supports different activated TCI state pools for UL and DL.

[0245] According to the seventh embodiment described above, the UE can maintain compatibility with existing specifications and can implement at least one of the above functions.

[0246] (Wireless Communication System)

[0247] The following describes a configuration of a wireless communication system according to an embodiment of the present disclosure. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.

[0248] Figure 18 This figure shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), or the like.

[0249] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0250] 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.

[0251] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0252] The wireless communication system 1 may also include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) that are deployed within the macrocell C1 and form small cells C2 that are narrower than the macrocell C1. User terminals 20 may also be located within at least one of the cells. The configuration and number of cells and user terminals 20 are not limited to those shown in the figure. Hereinafter, when not distinguishing between base stations 11 and 12, they are collectively referred to as base stations 10.

[0253] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0254] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0255] 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.

[0256] Multiple base stations 10 can also be connected by wired (for example, optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (for example, NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 equivalent to the upper station can also be called an integrated access backhaul (IAB) donor, and the base station 12 equivalent to the relay station (relay) can also be called an IAB node.

[0257] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0258] The user terminal 20 may also be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0259] In the wireless communication system 1, a radio access scheme based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), or single carrier frequency division multiple access (SC-FDMA) may be used.

[0260] The radio access scheme may also be referred to as a waveform. In addition, 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.

[0261] As downlink channels, the wireless communication system 1 may use 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.

[0262] In addition, as uplink channels, the wireless communication system 1 can also use 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.

[0263] User data, higher-layer control information, and system information blocks (SIBs) are transmitted via the PDSCH. User data, higher-layer control information, and the like can also be transmitted via the PUSCH. Furthermore, the Master Information Block (MIB) can also be transmitted via the PBCH.

[0264] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.

[0265] In addition, the DCI that schedules the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be replaced by DL data, and the PUSCH may also be replaced by UL data.

[0266] In PDCCH detection, a control resource set (CORESET) and a search space can also be used. A CORESET corresponds to the resources for searching for DCI. A search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space settings.

[0267] A search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in this disclosure may be used interchangeably.

[0268] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted via the PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted via the PRACH.

[0269] In the present disclosure, downlink, uplink, etc. may be expressed without the word "link." Furthermore, various channels may be expressed without the word "physical" at the beginning.

[0270] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As DL-RS, in the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0271] For example, a synchronization signal may be at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SSs (PSS, SSS) and PBCHs (and DMRS for PBCHs) may also be referred to as an SS / PBCH block or an SS block (SSB). Furthermore, SSs and SSBs may also be referred to as reference signals.

[0272] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0273] (Base Station)

[0274] Figure 19This figure shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface (transmission line interface) 140. Furthermore, more than one of each of the control unit 110, the transmitting / receiving unit 120, the transmitting / receiving antenna 130, and the transmission path interface 140 may be provided.

[0275] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0276] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which this disclosure relates.

[0277] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. It may also control transmission and reception, measurement, etc., using the transmission and reception unit 120, the transmission and reception antennas 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting up, releasing, etc.) of communication channels, manage the status of the base station 10, manage radio resources, etc.

[0278] The transceiver unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transceiver circuit, and the like, which are described based on common knowledge in the technical fields involved in this disclosure.

[0279] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0280] The transmitting and receiving antenna 130 can be formed of an antenna described based on common knowledge in the technical field to which this disclosure relates, such as an array antenna.

[0281] The transmitting and receiving unit 120 may also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the aforementioned uplink channel, uplink reference signal, etc.

[0282] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0283] The sending and receiving unit 120 (sending processing unit 1211) can also perform processing on the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (for example, RLC retransmission control), the Medium Access Control (MAC) layer (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0284] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (DFT) processing (as needed), inverse fast Fourier transform (IFFT) processing), precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0285] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0286] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, and demodulation into a baseband signal on the radio frequency band signal received via the transmitting and receiving antenna 130 .

[0287] The transmitting and receiving unit 120 (receiving processing unit 1212) can also apply receiving processing such as analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0288] The transmitting and receiving unit 120 (measuring unit 123) may also perform measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (SINR), signal to noise ratio (SNR)), signal strength (e.g., received signal strength indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0289] The transmission path interface 140 can also send and receive signals (return signaling) between the devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0290] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 120 , the transmitting and receiving antenna 130 , and the transmission path interface 140 .

[0291] The transmitting and receiving unit 120 may also transmit information indicating a first transmission configuration indication (TCI) state from a plurality of TCI states. The control unit 110 may also control reception of a measurement result of a first channel state information reference signal (CSI-RS) corresponding to the first TCI state based on an association between the TCI state and the CSI-RS.

[0292] (User Terminal)

[0293] Figure 20 This figure shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Furthermore, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0294] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0295] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which this disclosure relates.

[0296] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission, reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals and forward them to the transmission and reception unit 220.

[0297] The transceiver unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, and the like, which are described based on common knowledge in the technical fields involved in this disclosure.

[0298] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit or may be composed of a transmitting unit and a receiving unit. The transmitting unit may also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0299] The transmitting and receiving antenna 230 can be formed of an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0300] The transmitting and receiving unit 220 may also receive the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the aforementioned uplink channel, uplink reference signal, etc.

[0301] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0302] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0303] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0304] In addition, whether or not to apply DFT processing may also be based on the transform precoding setting. For a certain channel (e.g., PUSCH), if transform precoding is valid (enabled), the transmitting / receiving unit 220 (transmitting processing unit 2211) may perform DFT processing as the aforementioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting / receiving unit 220 (transmitting processing unit 2211) may perform DFT processing as the aforementioned transmission processing without performing DFT processing.

[0305] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0306] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may also perform amplification, filter processing, and demodulation into a baseband signal on the radio frequency band signal received by the transmitting and receiving antenna 230 .

[0307] The transmitting and receiving unit 220 (receiving processing unit 2212) can also apply receiving processing such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0308] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to received signals. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signals. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0309] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0310] The transmitting and receiving unit 220 may also receive information indicating a first Transmit Configuration Indicator (TCI) state among multiple TCI states. The control unit 210 may also measure a first Channel State Information Reference Signal (CSI-RS) corresponding to the first TCI state based on the association between the TCI state and the CSI-RS.

[0311] The control unit 210 may also apply the first TCI state to the downlink and uplink.

[0312] The control unit 210 may not measure a second CSI-RS corresponding to a second TCI state other than the first TCI state among the multiple TCI states.

[0313] The control unit 210 may also receive a channel or a reference signal having a QCL type D different from the quasi co-location (QCL type D) of the second CSI-RS in the same symbol as the second CSI-RS.

[0314] (Hardware Structure)

[0315] In addition, the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, by wired, wireless, etc.) and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0316] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any of them are as described above, and the implementation method is not particularly limited.

[0317] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 21 This figure shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. The base station 10 and user terminal 20 described above can also 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, and the like.

[0318] In addition, in this disclosure, the terms such as device, circuit, equipment, section, and unit are interchangeable. The hardware structure of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0319] For example, although only one processor 1001 is shown, multiple processors may be provided. Furthermore, processing may be performed by a single processor, or by two or more processors simultaneously, sequentially, or using other methods. Furthermore, processor 1001 may be implemented using more than one chip.

[0320] Regarding the various functions in the base station 10 and the user terminal 20, for example, they are achieved by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0321] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a computing device, registers, etc. For example, at least a portion of the control unit 110 (210) and the transmitting and receiving unit 120 (220) described above may also be implemented by the processor 1001.

[0322] In addition, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and performs various processes based on them. As a program, a program that causes a computer to perform at least a portion of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks can also be implemented similarly.

[0323] The memory 1002 may also be a computer-readable recording medium, for example, comprised of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 may store executable programs (program code), software modules, etc., for implementing the wireless communication method according to an embodiment of the present disclosure.

[0324] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, or a key drive), a magnetic stripe, a database, a server, or other suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0325] The communication device 1004 is hardware (a transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. To implement at least one of frequency division duplex (FDD) and time division duplex (TDD), the communication device 1004 may also include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like. For example, the aforementioned transmitting and receiving unit 120 (220), transmitting and receiving antenna 130 (230), and the like may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be implemented by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0326] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, light emitting diode (LED) lamp, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrated (e.g., a touch panel).

[0327] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0328] Furthermore, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and may use such hardware to implement part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware components.

[0329] (Variation)

[0330] In addition, the terms described in this disclosure and the terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, or may be referred to as a pilot, pilot signal, etc. depending on the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, frequency carrier, carrier frequency, etc.

[0331] A radio frame can also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) that constitute a radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) that is independent of the parameter set (numerology).

[0332] Here, the parameter set may also be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, radio frame structure, specific filter processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, and the like.

[0333] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0334] A time slot may also contain multiple mini-slots. Each mini-slot may also consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may also consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

[0335] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units used for signal transmission. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective equivalents. Furthermore, the terms frame, subframe, time slot, mini-time slot, and symbol may be used interchangeably in this disclosure.

[0336] For example, a subframe can be called a TTI, multiple consecutive subframes can be called a TTI, and a slot or a mini-slot can be called a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Furthermore, the unit representing a TTI can be called a slot, a mini-slot, or the like, rather than a subframe.

[0337] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules each user terminal by allocating radio resources (such as the frequency bandwidth and transmit power available to each user terminal) in TTI units. The definition of TTI is not limited to this.

[0338] The TTI may also be a unit of time for transmitting channel-coded data packets (transport blocks), code blocks, code words, etc., and may also be a unit of processing for scheduling, link adaptation, etc. Furthermore, when a TTI is given, the time interval (e.g., the number of symbols) to which the transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

[0339] In addition, when a time slot or a mini-time slot is called a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can also be the minimum time unit for scheduling. In addition, the number of time slots (mini-time slots) that constitute the minimum time unit for scheduling can also be controlled.

[0340] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a subslot, a time slot, etc.

[0341] In addition, long TTI (for example, normal TTI, subframe, etc.) can also be replaced by TTI with a time length exceeding 1ms, and short TTI (for example, shortened TTI, etc.) can also be replaced by TTI with a TTI length smaller than long TTI and greater than 1ms.

[0342] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it may also include one or more consecutive subcarriers (subcarriers). The number of subcarriers included in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0343] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks.

[0344] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0345] 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.

[0346] A Bandwidth Part (BWP) (also referred to as a fractional bandwidth) can also represent a subset of contiguous common resource blocks (RBs) used for a particular parameter set within a particular carrier. Common RBs can also be identified by their index relative to the common reference point of the carrier. PRBs can also be defined within a BWP and numbered within that BWP.

[0347] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured within one carrier.

[0348] At least one of the configured BWPs may be activated, and the UE may not assume that it will transmit or receive specific signals / channels outside of the activated BWP. In addition, the terms "cell," "carrier," and the like in this disclosure may be replaced with "BWP."

[0349] The above-mentioned structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various modifications may be made to the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots within a slot, the number of symbols and RBs within a slot or mini-slot, the number of subcarriers within an RB, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length.

[0350] Furthermore, the information and parameters described in this disclosure may be expressed as absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may be indicated by specific indexes.

[0351] The names used for parameters, etc. in this disclosure are not intended to be limiting in any respect. Furthermore, the mathematical formulas for these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not intended to be limiting in any respect.

[0352] Information, signals, and the like described in this disclosure may also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referred to throughout the foregoing description may also be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0353] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0354] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or appended. Output information, signals, etc. may also be deleted. Input information, signals, etc. may also be sent to other devices.

[0355] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0356] In addition, physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. In addition, MAC signaling may also be notified using, for example, a MAC Control Element (CE).

[0357] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0358] The determination can be made by a value represented by a bit (0 or 1), a true or false value (Boolean value) represented by true (true) or false (false), or by comparison of numerical values ​​(for example, comparison with a specific value).

[0359] The term “software” or “firmware” shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, or the like.

[0360] Furthermore, software, instructions, information, and the like may also be transmitted and received via a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0361] The terms "system" and "network" used in this disclosure can be used interchangeably. "Network" may also refer to devices included in the network (eg, base stations).

[0362] 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", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0363] In this disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP))", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. In some cases, a base station may be referred to as a macro cell, small cell, femto cell, or pico cell.

[0364] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entire coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within that coverage area.

[0365] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (UE)”, and “terminal” can be used interchangeably.

[0366] 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, hand set, user agent, mobile client, client, or several other appropriate terms.

[0367] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Furthermore, at least one of the base station and the mobile station may also be a device mounted on a mobile object, a mobile object itself, etc. The mobile object may be a means of transportation (e.g., a vehicle, an aircraft, etc.), a mobile object that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0368] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by communication between multiple user terminals (for example, which may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be configured such that the user terminal 20 has the functions of the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0369] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0370] In the present disclosure, operations are assumed to be performed by a base station, and sometimes, depending on the circumstances, by its upper node. Obviously, 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 (for example, a Mobility Management Entity (MME)), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0371] The various methods / implementations described in this disclosure may be used individually or in combination, and may be switched between them during execution. Furthermore, the processing procedures, sequences, flow charts, and the like of the various methods / implementations described in this disclosure may be reversed as long as they do not conflict. For example, the methods described in this disclosure use an illustrative order to present elements of various steps, but are not limited to the specific order presented.

[0372] The various modes and embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX), Global System for Mobile Communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB)), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these. In addition, multiple systems can also be combined for application (for example, LTE or LTE-A, combination with 5G, etc.).

[0373] The phrase “based on” used in this disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on.”

[0374] Any reference to an element using the designations "first," "second," etc., as used in this disclosure, does not necessarily define the quantity or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, reference to a first and a second element does not imply that only two elements may be used or that the first element must in some way take precedence over the second element.

[0375] The term "determining" as used in this disclosure may encompass a variety of operations. For example, "determining" may also include judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, etc. as performing a "determination."

[0376] In addition, "judgment (decision)" can also be a situation where receiving (for example, receiving information), transmitting (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0377] Furthermore, "judgment (decision)" can also refer to situations where resolving, selecting, choosing, establishing, comparing, etc. can be considered as "judgment (decision)". In other words, "judgment (decision)" can also refer to situations where certain actions can be considered as "judgment (decision)".

[0378] In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and so on.

[0379] The "maximum transmit power" recorded in this disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0380] 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 the two elements being "connected" or "coupled." The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be replaced by "access."

[0381] In the present disclosure, when two elements are connected, it is possible to consider them being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0382] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other." Alternatively, the term may also mean "A and B are each different from C." Terms such as "separate" and "bound" may also be interpreted in the same way as "different."

[0383] When the terms "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," have an inclusive meaning. Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0384] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure may also include a case where the noun following the article is in a plural form.

[0385] While the inventions disclosed herein have been described in detail above, it will be apparent to those skilled in the art that the inventions disclosed herein are not limited to the embodiments described herein. The inventions disclosed herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the claims. Therefore, the descriptions in this disclosure are for illustrative purposes only and are not intended to limit the inventions disclosed herein in any way.

Claims

1. A terminal comprising: a receiving unit, receiving a medium access control control element (MAC CE) for activating multiple transmission setting indication states (TCI states) in the first cell, and receiving downlink control information (DCI) indicating a TCI state in the multiple TCI states; and A control unit measures a synchronization signal block (SSB) in a second cell having a physical cell ID (PCI) different from that of the first cell, The control unit applies the TCI state at a timing after transmission of an ACK corresponding to reception of a downlink shared channel (PDSCH) scheduled by the DCI.

2. The terminal according to claim 1, wherein: The receiving unit receives a TCI state list including the plurality of TCI states, where the list is a list of TCI states applicable to an uplink channel and a downlink channel.

3. The terminal according to claim 1, wherein: The method further includes a sending unit configured to send capability information indicating a maximum number of the plurality of TCI states activated through the MAC CE.

4. A wireless communication method, which is a wireless communication method of a terminal, comprising: The step of receiving a medium access control element (MAC CE) for activating multiple transmit configuration indication states (TCI states) in the first cell; receiving downlink control information (DCI) indicating a TCI state among the plurality of TCI states; The step of measuring a synchronization signal block (SSB) in a second cell having a physical cell ID (PCI) different from that of the first cell; and The step of applying the TCI state is performed at a timing after transmission of an ACK corresponding to reception of a downlink shared channel (PDSCH) scheduled by the DCI.

5. A system comprising a terminal and a base station, The terminal has: a receiving unit, receiving a medium access control control element (MAC CE) for activating multiple transmission setting indication states (TCI states) in the first cell, and receiving downlink control information (DCI) indicating a TCI state in the multiple TCI states; and A control unit measures a synchronization signal block (SSB) in a second cell having a physical cell ID (PCI) different from that of the first cell, The control unit applies the TCI state at a timing after transmission of an ACK corresponding to reception of a downlink shared channel (PDSCH) scheduled by the DCI, The base station includes a transmitting unit configured to transmit the downlink control information (DCI).

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