Terminal, wireless communication method, and system

Abstract

To appropriately determine information regarding QCL.SOLUTION: A terminal includes a receiving unit that receives a medium access control-control element (MAC CE) that activates multiple transmission configuration indication (TCI) states in a first cell and receives downlink control information (DCI) that indicates a TCI state among the multiple TCI states, and a control unit that measures a synchronization signal block (SSB) in a second cell having a physical cell ID (PCI) different from that of the first cell.SELECTED DRAWING: Figure 17

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 technology]

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

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

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

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

[0006] However, there are cases where information about the QCL is not clear. If information about the QCL is not clear, it may lead to a decrease in communication quality and throughput.

[0007] Therefore, an object of the present disclosure is to provide a terminal, a wireless communication method, and a system that appropriately determine information related to a QCL. [Means for solving the problem]

[0008] A terminal according to one embodiment of the present disclosure includes a receiving unit that receives a Medium Access Control-Control Element (MAC CE) that activates multiple transmission configuration indication (TCI) states in a first cell and receives downlink control information (DCI) that indicates a TCI state among the multiple TCI states, and a control unit that measures a synchronization signal block (SSB) in a second cell having a physical cell ID (PCI) different from that of the first cell. Effect of the Invention

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

[0010] [Figure 1]FIG. 1 is a diagram illustrating an example of a unified TCI framework. [Diagram 2] FIG. 2 is a diagram showing an example of a method for notifying a unified TCI state. [Diagram 3] FIG. 3 is a diagram illustrating an example of a method for determining a TCI state according to the first embodiment. [Figure 4] 4A and 4B are diagrams illustrating an example of a method for determining a TCI state according to the second embodiment. [Diagram 5] FIG. 5 is a diagram illustrating an example of a method for determining a TCI state according to the first modification of the second embodiment. [Figure 6] FIG. 6 is a diagram illustrating an example of a method for determining a TCI state according to the second modification of the second embodiment. [Figure 7] FIG. 7 is a diagram showing an example of common beam updating according to form 3-1. [Figure 8] FIG. 8 is a diagram showing an example of common beam updating according to form 3-2. [Figure 9] FIG. 9 is a diagram showing an example of common beam updating according to form 3-3. [Figure 10] FIG. 10 is a diagram showing an example of common beam updating according to form 3-4. [Figure 11] FIG. 11 is a diagram showing an example of common beam updating according to form 3-5. [Figure 12] FIG. 12 is a diagram showing an example of common beam updating according to form 3-6. [Figure 13] FIG. 13 is a diagram illustrating an example of activation / deactivation of CSI-RS / TRS according to the fourth embodiment. [Figure 14] 14A and 14B are diagrams illustrating another example of activation / deactivation of CSI-RS / TRS according to the fourth embodiment. [Figure 15] FIG. 15 is a diagram illustrating an example of timing related to CSI-RS / TRS according to the fifth embodiment. [Figure 16] FIG. 16 is a diagram illustrating another example of timing related to the CSI-RS / TRS according to the fifth embodiment. [Figure 17] 17A and 17B are diagrams illustrating an example of scheduling constraints according to the sixth embodiment. [Figure 18] FIG. 18 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 19] FIG. 19 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 20] FIG. 20 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 21] FIG. 21 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

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

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

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

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

[0016] A plurality of types (QCL types) of QCL may be defined. For example, four QCL types AD may be provided, each having different parameters (or parameter sets) that can be assumed to be the same. The parameters (which may be called QCL parameters) are as follows: QCL Type A (QCL-A): Doppler shift, Doppler spread, mean delay and delay spread, QCL type B (QCL-B): Doppler shift and Doppler spread, QCL type C (QCL-C): Doppler shift and mean delay, · QCL type D (QCL-D): spatial reception parameters.

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

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

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

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

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

[0022] In addition, the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).

[0023] An SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may be referred to as an SS / PBCH block.

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

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

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

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

[0028] In this disclosure, upper layer filtered RSRP, filtered RSRP, and layer 3 filtered RSRP may be interpreted as interchangeable.

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

[0030] In Rel.15, separate MAC CEs are required for activation / deactivation of PUCCH spatial relation and activation / deactivation of SRS spatial relation. PUSCH spatial relation follows SRS spatial relation.

[0031] 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.

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

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

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

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

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

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

[0038] (Multi-TRP) In NR, it is considered that one or more transmission / reception points (TRPs) (multi-TRPs (MTRPs)) will perform DL transmission to a UE using one or more panels (multi-panels). It is also considered that a UE will perform UL transmission to one or more TRPs using one or more panels.

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

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

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

[0042] In addition, multiple PDSCHs (multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap with at least one of the time and frequency resources.

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

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

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

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

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

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

[0049] The CSI-RS resources may include at least one of a Non Zero Power (NZP) CSI-RS resource, a Zero Power (ZP) CSI-RS resource, and a CSI Interference Measurement (CSI-IM) resource.

[0050] The resource for measuring the signal component for CSI may be referred to as a Signal Measurement Resource (SMR) or a Channel Measurement Resource (CMR). The SMR (CMR) may include, for example, NZP CSI-RS resources, SSB, etc. for channel measurement.

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

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

[0053] In addition, the CSI may include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), a SS / PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), 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).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0069] In the example of FIG. 1, 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.

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

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

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

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

[0074] The relationship between CSI-RS / TRS measurements and other channels is not clear. For example, the RS overhead of CSI-RS / TRS and the scheduling constraints of other channels with different QCL types D can be problematic. If the relationship between CSI-RS / TRS measurements and other channels is not clear, it may lead to degradation of communication quality and throughput.

[0075] Therefore, the present inventors came up with the idea of ​​operations related to CSI-RS.

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

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

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

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

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

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

[0082] In 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 in TCI state / QCL assumption, RS of QCL type A in TCI state / QCL assumption, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, PL-RS, may be read as interchangeable. 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, SRS, may be read as interchangeable.

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

[0084] In the present disclosure, HARQ-ACK information, ACK, and NACK may be interpreted as interchangeable.

[0085] In the present disclosure, single TRP, single TRP system, single TRP transmission, and single PDSCH may be interchangeable. In the present disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be interchangeable. In the present disclosure, single DCI, single PDCCH, multi-TRP based on single DCI, and activating two TCI states on at least one TCI codepoint may be interchangeable.

[0086] In the present disclosure, a single TRP, a channel using a single TRP, a channel using one TCI state / spatial relationship, multi-TRP not being enabled by RRC / DCI, multiple TCI states / spatial relationships not being enabled by RRC / DCI, a CORESETPoolIndex value of 1 not being set for any CORESET, and no code point in the TCI field being mapped to two TCI states may be read as interchangeable.

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

[0088] 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 having TRS information (higher layer parameter trs-Info), and NZP CSI-RS resource in an NZP CSI-RS resource set having TRS information may be interchangeable. In the present disclosure, CSI-RS resource, CSI-RS resource set, CSI-RS resource group, and information element (IE) may be interchangeable.

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

[0090] In this disclosure, a common beam, a unified TCI state, a beam applicable to DL and UL, a beam applied to multiple channels, and PL-RS may be interpreted as interchangeable.

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

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

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

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

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

[0096] If the new TCI fields exist in DCI formats 1_1 and 1_2, the TCI fields of Rel. 15 / 16 do not need to exist in DCI formats 1_1 and 1_2.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0156] <Fourth embodiment> A common TCI state pool may be configured by higher layers and one or more unified / common TCI states may be activated (indicated).

[0157] The one or more unified / common TCI states may be activated by the MAC CE. The one or more unified / common TCI states may be indicated by the DCI. A set of unified / common TCI states may be activated by the MAC CE and from the set, the one or more unified / common TCI states may be indicated by the DCI.

[0158] The one or more unified / common TCI states, unified / common TCI state activated / indicated by MAC CE / DCI, active unified / common TCI state, active TCI state, and activated TCI state may be interpreted as interchangeable.

[0159] The UE may receive information (MAC CE / DCI) indicating a first TCI state (one or more unified / common TCI states) of a plurality of TCI states (a plurality of unified / common TCI states).

[0160] One set of unified / common TCI states may be activated for all channels, UL and DL. One set of unified / common TCI states may be activated for UL. One set of unified / common TCI states may be activated for DL.

[0161] The correspondence between the active unified / common TCI state and the CSI-RS / TRS may be configured by higher layers or may be specified in a specification. The correspondence may associate a TCI state ID with a resource ID of the CSI-RS / TRS. The CSI-RS may be at least one of the P-CSI-RS, the SP-CSI-RS, and the A-CSI-RS.

[0162] The correspondence between the active 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 be an RS configured for the CSI-RS / TRS. For example, the TCI state corresponding to the CSI-RS / TRS may be a QCL type D RS configured in the TCI state for the CSI-RS / TRS, or may be RSs of all QCL types (e.g., QCL type A and QCL type D) configured in the TCI state for the CSI-RS / TRS.

[0163] The UE may measure a CSI-RS / TRS (first CSI-RS) corresponding to an active unified / common TCI state (first TCI state). There may be a scheduling constraint for an RS / channel 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 assume that it will not receive a channel / RS having a different QCL type D from that of the first CSI-RS (RS with QCL type D) in the same symbol as the first CSI-RS. The scheduling constraint and the channel / RS having a different QCL type D from that of the CSI-RS (RS with QCL type D) are not scheduled in the same symbol as the CSI-RS may be read as interchangeable.

[0164] A UE that has reported a particular UE capability may be able to simultaneously receive multiple channels / RSs with different QCL types D, with at least one constraint that the UE receives the multiple channels / RSs using different UE panels, that the multiple channels / RSs correspond to different CORESET pool indices (TRPs), and that the multiple channels / RSs correspond to different groups in a group-based beam report. Scheduling constraints for RSs / channels with different QCL types D in the same symbol as a CSI-RS / TRS may be specified according to this constraint.

[0165] The UE may not measure a CSI-RS / TRS (second CSI-RS) corresponding to a deactive unified / common TCI state (second TCI state). There may be no scheduling constraint for an RS / channel 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 receive a channel / RS having a different QCL type D from that of the second CSI-RS (RS with QCL type D) in the same symbol as the second CSI-RS.

[0166] In the example of Fig. 13, using the first embodiment, a unified / common TCI state is activated, the P-CSI-RS / TRS corresponding to an active unified / common TCI state is activated, and the P-CSI-RS / TRS corresponding to a deactive unified / common TCI state is deactivated.

[0167] In the example of Fig. 14, using the second embodiment, TCI states in the unified / common TCI state pool for UL and TCI states in the unified / common TCI state pool for DL ​​are activated. P-CSI-RS / TRS corresponding to active unified / common TCI states 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. P-CSI-RS / TRS corresponding to deactive unified / common TCI states (and TCI states not included in both the unified / common TCI state pool for UL and the unified / common TCI state pool for DL) are deactivated.

[0168] According to the fourth embodiment described above, CSI-RS / TRS can be appropriately measured. In addition, by applying a scheduling constraint to symbols of only CSI-RS / TRS corresponding to an active TCI state, scheduling of PDSCH and the like can be performed in more resources, and peak user throughput can be improved.

[0169] <Fifth embodiment> At least one of the timing when CSI-RS / TRS reception becomes necessary / unnecessary (switching) and the timing when scheduling constraints are applied may be specified. The terms "CSI-RS / TRS reception is necessary," "CSI-RS / TRS is activated," and "CSI-RS / TRS measurement is valid" may be interchangeable. The terms "CSI-RS / TRS reception is not necessary," "CSI-RS / TRS is deactivated," and "CSI-RS / TRS measurement is invalid" may be interchangeable.

[0170] The timing when reception of CSI-RS / TRS is required / not required and the timing when scheduling constraints are applied may be the same or different.

[0171] At least one of the timing when reception of CSI-RS / TRS is required / not required and the timing when scheduling constraints are applied may be the same as the update timing of the common beam or may be different from the update timing of the common beam.

[0172] The update timing of the common beam may follow the third embodiment.

[0173] At least one of the timing when it becomes necessary / unnecessary to receive CSI-RS / TRS and the timing when the scheduling constraint is applied may be the last update timing among multiple update timings of the common beam. The last update timing may be the timing when the common beam for all channels is updated. In the example of FIG. 15, the DCI, PDSCH, and PUCCH are the same as those in FIG. 7. In this example, at timing #1, the common beam for channels other than the PDCCH is updated, and at timing #2, the beam for the PDCCH is updated to the common beam. At least one of the timing when it becomes necessary / unnecessary to receive CSI-RS / TRS and the timing when the scheduling constraint is applied may be timing #2.

[0174] At least one of the timing when it is necessary / unnecessary to receive CSI-RS / TRS and the timing when the scheduling constraint is applied may be a specific time after the last update timing among multiple update timings of the common beam. The specific time may be K symbols or K slots. K may be specified by a specification, may be set by a higher layer, or may be reported by the UE as UE capability. In the example of FIG. 16, the DCI, PDSCH, and PUCCH are the same as those in FIG. 7. In this example, at timing #1, the common beam for channels other than the PDCCH is updated, and at timing #2, the beam for the PDCCH is updated to the common beam. At least one of the timing when it is necessary / unnecessary to receive CSI-RS / TRS and the timing when the scheduling constraint is applied may be timing #3 K symbols after timing #2.

[0175] According to the above fifth embodiment, CSI-RS / TRS can be appropriately measured and scheduling constraints can be appropriately applied.

[0176] Sixth embodiment In Rel.15 / 16, in FR2, when P-CSI-RS / TRS resources and TCI state are configured by RRC, the peak UE throughput is reduced due to scheduling constraints / availability of PDSCH with different QCL assumptions on the same symbols as P-CSI-RS / TRS.

[0177] In the example of Figure 17A, the TCI state of the PDSCH is TCI#3. The P-CSI-RS resources in symbols #1 to #8 have TCI#1 to #8, respectively. In Rel. 15, only symbol #3 of the P-CSI-RS resource with the same TCI state is available for the PDSCH, and symbols #1, #2, #4 to #8 of the P-CSI-RS resource with different TCI states are not available for the PDSCH. Thus, there are fewer symbols available for the PDSCH.

[0178] In a unified TCI state for DL ​​and DL common beams, the question arises as to whether the UE should continue to monitor the P-CSI-RS / TRS corresponding to the inactive unified TCI state.

[0179] If the UE does not monitor the P-CSI-RS / TRS corresponding to the inactive unified TCI state, there may be no scheduling constraint for the PDSCH with different QCL assumptions on the same symbols as the P-CSI-RS / TRS, which can improve the peak UE throughput.

[0180] In the example of Figure 17B, the P-CSI-RS resource of only symbol #3 is active, and the P-CSI-RS resources of symbols #1, #2, #4 to #8 are inactive. Symbols #1 to #8 are available for the PDSCH. More symbols become available for the PDSCH.

[0181] Problems may occur due to all CSI-RS / TRS corresponding to a deactive unified / common TCI state being deactivated (UE does not measure the CSI-RS / TRS, there is no scheduling constraint for the CSI-RS / TRS). For example, in layer 3 (L3) measurements (CSI-RS / SSB for mobility, handover), measurements may be required even if the unified TCI state of the own cell is deactivated.

[0182] Therefore, it may not be necessary for a specific application that all CSI-RS / TRS corresponding to the deactivated unified / common TCI state are deactivated (UE does not measure the CSI-RS / TRS, there is no scheduling constraint for the CSI-RS / TRS). The specific application may be a mobility / handover application.

[0183] In inter-cell beam management, it is considered that a UE measures the CSI-RS / TRS / SSB of other cells (cells having different physical cell identities (PCIs)). The UE may measure the CSI-RS / TRS / SSB associated with the TCI state of other cells regardless of whether the corresponding unified TCI state is active or inactive. The UE may measure the CSI-RS / TRS / SSB associated with the TCI state of other cells only when the corresponding unified TCI state is active.

[0184] According to the sixth embodiment described above, measurements for specific purposes can be performed appropriately.

[0185] Seventh embodiment A UE capability corresponding to at least one function (feature) in the first to sixth embodiments may be defined. If the UE reports this UE capability, the UE may perform the corresponding function. If the UE reports this UE capability and a higher layer parameter corresponding to this function is configured, the UE may perform the corresponding function. A higher layer parameter (RRC information element) corresponding to this function may be defined. If this higher layer parameter is configured, the UE may perform the corresponding function.

[0186] The UE capability may indicate whether the UE supports this feature.

[0187] The UE capability may indicate the maximum number of RRC-configured TCI states that the UE supports. The maximum number of RRC-configured TCI states may be the maximum number of TCI states configured for both UL and DL. The maximum number of RRC-configured TCI states may be reported separately for the maximum number of TCI states configured for UL and the maximum number of TCI states configured for DL.

[0188] The UE capabilities may indicate the maximum number of active TCI states that the UE supports. The maximum number of active TCI states may be the maximum number of active TCI states for both UL and DL. The maximum number of active TCI states may be reported separately for the maximum number of active TCI states for UL and the maximum number of active TCI states for DL.

[0189] The UE capabilities may indicate whether the UE supports different active TCI state pools for UL and DL.

[0190] According to the seventh embodiment, the UE can achieve at least one of the above functions while maintaining compatibility with existing specifications.

[0191] (Wireless communication system) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0192] 18 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0193] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0194] 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.

[0195] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0196] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0197] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0198] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0199] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0200] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0201] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0202] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0203] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0204] The radio access scheme may be called a waveform. 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.

[0205] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as a downlink channel.

[0206] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0207] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0208] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0209] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0210] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0211] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0212] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0213] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0214] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0215] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0216] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0217] (base station) 19 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.

[0218] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0219] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0220] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0221] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0222] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0223] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0224] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0225] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0226] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0227] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0228] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0229] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0230] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0231] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0232] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0233] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0234] The transceiver 120 may transmit information indicating a first transmission configuration indication (TCI) state from among a plurality of TCI states. The controller 110 may 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.

[0235] (User terminal) 20 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0236] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0237] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0238] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0239] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0240] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0241] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0242] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0243] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0244] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0245] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0246] In addition, whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0247] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0248] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0249] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0250] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0251] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0252] The transceiver 220 may receive information indicating a first transmission configuration indication (TCI) state among a plurality of TCI states, and the controller 210 may measure 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.

[0253] The controller 210 may apply the first TCI state to both the downlink and the uplink.

[0254] The control unit 210 may not need to measure a second CSI-RS corresponding to a second TCI state other than the first TCI state among the plurality of TCI states.

[0255] The control unit 210 may 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.

[0256] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0257] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0258] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 21 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0259] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0260] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0261] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0262] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0263] Moreover, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0264] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0265] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0266] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0267] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0268] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0269] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0270] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0271] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0272] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0273] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0274] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0275] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0276] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0277] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0278] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0279] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0280] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0281] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0282] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0283] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0284] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0285] 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.

[0286] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0287] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0288] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0289] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0290] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0291] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0292] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0293] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0294] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0295] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0296] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0297] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0298] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0299] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0300] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0301] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0302] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," and the like may be used interchangeably.

[0303] In this disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0304] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0305] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0306] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0307] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0308] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0309] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0310] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0311] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0312] Each aspect / embodiment described in the present disclosure may be implemented using any of a wide variety of standards, including Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems using 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other appropriate wireless communication methods, next-generation systems that are based on these, etc. Also, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0313] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0314] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0315] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0316] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0317] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0318] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0319] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

[0320] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0321] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0322] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0323] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0324] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0325] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

Claims

1. a receiver for receiving a Medium Access Control-Control Element (MAC CE) for activating a plurality of Transmission Configuration Indication (TCI) states in a first cell, and receiving Downlink Control Information (DCI) for indicating a TCI state among the plurality of TCI states; A terminal comprising: a control unit that measures a synchronization signal block (SSB) in a second cell having a physical cell ID (PCI) different from that of the first cell.

2. The terminal according to claim 1 , wherein the control unit measures the SSB if a TCI state corresponding to the SSB is activated.

3. The terminal according to claim 1 , wherein 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 in the DCI.

4. The terminal according to claim 1 , wherein the receiving unit receives a list of TCI states including the plurality of TCI states, the list of TCI states being applicable to an uplink channel and a downlink channel.

5. The terminal of claim 1 , further comprising: a transmitter configured to transmit capability information indicating a maximum number of the plurality of TCI states activated by the MAC CE.

6. receiving a Medium Access Control-Control Element (MAC CE) activating a plurality of Transmission Configuration Indication (TCI) states in a first cell; receiving downlink control information (DCI) indicating a TCI state among the plurality of TCI states; and measuring a Synchronization Signal Block (SSB) in a second cell having a different Physical Cell ID (PCI) from the first cell.

7. A system including a terminal and a base station, The terminal includes: a receiver for receiving a Medium Access Control-Control Element (MAC CE) for activating a plurality of Transmission Configuration Indication (TCI) states in a first cell, and receiving Downlink Control Information (DCI) for indicating a TCI state among the plurality of TCI states; A control unit that measures a synchronization signal block (SSB) in a second cell having a physical cell ID (PCI) different from that of the first cell, The base station, A system comprising a transmitter for transmitting the downlink control information (DCI).

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