Terminal, wireless communication method, base station and system

Abstract

The terminal according to one embodiment of the present disclosure comprises a reception unit which receives a list of a plurality of service cells or a plurality of bandwidth portions and which receives configuration information for states of a plurality of transmission configuration indicators (TCI) that can be applied to a plurality of channels; and a control unit which determines a first quasi-colocation (QCL) reference signal and a second QCL reference signal for a demodulation reference signal (DMRS) on the basis of the configuration information and a restriction relating to the first QCL reference signal and the second QCL reference signal, said reference signals being applied to the plurality of service cells or the plurality of bandwidth portions. According to one aspect of the present disclosure, TCI state indication can be carried out as appropriate.

Description

[Technical field]

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

[0002] In 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] In addition, in Rel. 17 and later, the use of a common TCI across at least one of multiple Component Carriers (CCs) and multiple Bandwidth Parts (BWPs) is being considered.

[0007] However, the method of setting and indicating a common beam (common TCI) for multiple CCs / BWPs has not been sufficiently studied. If this study is not done sufficiently, it may lead to a deterioration in communication quality and throughput.

[0008] Therefore, the present disclosure relates to a terminal and a wireless communication method for appropriately indicating a TCI state. 、 base station and systems One of the aims is to provide. [Means for solving the problem]

[0009] A terminal according to one embodiment of the present disclosure includes a receiving unit that receives a list of multiple serving cells and receives configuration information of multiple transmission configuration indication (TCI) states applicable to multiple types of channels, and a control unit that determines an RS of the first quasi-co-location (QCL) type and an RS of the second QCL type to be applied to the multiple serving cells based on a constraint on a reference signal (RS) of a first quasi-co-location (QCL) type for a demodulation reference signal (DMRS) and an RS of a second QCL type and the configuration information, in which an RS in a serving cell to which a TCI state is applied by the terminal is configured as the RS of the first QCL type, and an RS in a serving cell other than the serving cell to which a TCI state is applied by the terminal is configured as the RS of the second QCL type. setting will be done. Effect of the Invention

[0010] According to one aspect of the present disclosure, the TCI status can be appropriately indicated. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing an example of simultaneous beam updating across multiple CCs. [Diagram 2] 2A and 2B are diagrams showing an example of a common beam. [Diagram 3] FIG. 3 is a diagram showing an example of configurable QCL settings. [Figure 4] FIG. 4 is a diagram showing an example of a non-configurable QCL setting. [Diagram 5] FIG. 5 is a diagram illustrating an example of a TCI state indication in the unified TCI state framework in a CA. [Figure 6] FIG. 6 is a diagram illustrating an example of QCL constraints in case 4. [Figure 7] FIG. 7 is a diagram illustrating an example of QCL constraints in case 5. [Figure 8] FIG. 8 is a diagram illustrating an example of setting information according to the third embodiment. [Figure 9]FIG. 9 is a diagram showing an example of the setting of the QCL type D RS according to the embodiment 4-1. [Figure 10] FIG. 10 is a diagram illustrating an example of the setting of the QCL type D RS according to the fifth embodiment. [Figure 11] FIG. 11 is a diagram showing an example of beam application times in multiple CCs. [Figure 12] FIG. 12 is a diagram showing an example of a TCI status indication for multiple CCs by one DCI. [Figure 13] FIG. 13 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 15] FIG. 15 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 16] FIG. 16 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

[0012] (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 for at least one of a signal and a channel (referred to as a signal / channel) based on a transmission configuration indication state (TCI state).

[0013] 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.

[0014] 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.

[0015] 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).

[0016] 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).

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0022] 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)).

[0023] 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).

[0024] 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.

[0025] 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.

[0026] (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.

[0027] 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.

[0028] 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.

[0029] In this disclosure, upper layer filtered RSRP, filtered RSRP, and layer 3 filtered RSRP may be interpreted as interchangeable.

[0030] (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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] (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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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).

[0045] 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).

[0046] In URLLC for multiple TRPs, it is considered that PDSCH (transport block (TB) or codeword (CW)) repetition across multiple TRPs is supported. It is considered that repetition schemes (URLLC schemes, for example, schemes 1, 2a, 2b, 3, and 4) across multiple TRPs in the frequency domain, layer (spatial) domain, or time domain are supported. In scheme 1, multiple PDSCHs from multiple TRPs are space division multiplexed (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are frequency division multiplexed (FDM). In scheme 2a, the redundancy version (RV) is the same for multiple TRPs. In scheme 2b, the RVs may be the same or different for multiple TRPs. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexed (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are transmitted in one slot. In scheme 4, multiple PDSCHs from multiple TRPs are transmitted in different slots.

[0047] Such a multi-TRP scenario allows for more flexible transmission control using channels with better quality.

[0048] 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.

[0049] If at least one of the following conditions 1 and 2 is satisfied, the UE may determine that the TRP is based on the multi-DCI. In this case, the TRP may be replaced with a CORESET pool index. [Condition 1] A CORESET pool index of 1 is set. [Condition 2] Two different values ​​of the CORESET pool index (eg, 0 and 1) are set.

[0050] If the following conditions are met, the UE may determine that the UE is multi-TRP based on a single DCI. In this case, the two TRPs may be interpreted as two TCI states indicated by the MAC CE / DCI. [conditions] "Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE" is used to indicate one or two TCI states for one code point of the TCI field in the DCI.

[0051] The DCI for common beam instruction may be a UE-specific DCI format (e.g., DL DCI format (e.g., 1_1, 1_2), UL DCI format (e.g., 0_1, 0_2)) or a UE-group common DCI format.

[0052] (Simultaneous beam update of multiple CCs) In Rel.16, one MAC CE can update the beam index (TCI state) of multiple CCs.

[0053] The UE may be configured by the RRC with up to two applicable CC lists (e.g., applicable-CC-list). When two applicable CC lists are configured, the two applicable CC lists may correspond to in-band CA in FR1 and in-band CA in FR2, respectively.

[0054] Activation of TCI states on PDCCH The MAC CE activates the TCI states associated with the same CORESET ID on all BWP / CCs in the applicable CC list.

[0055] Activation of TCI state for PDSCH The MAC CE activates the TCI state on all BWP / CCs in the applicable CC list.

[0056] A-SRS / SP-SRS Spatial Relationship Activation The MAC CE activates the spatial relationships associated with the same SRS resource ID on all BWPs / CCs in the applicable CC list.

[0057] In the example of Figure 1, the UE is configured with an applicable CC list indicating CC#0, #1, #2, #3, and a list indicating 64 TCI states for CORESET or PDSCH of each CC. When one TCI state in CC#0 is activated by the MAC CE, the corresponding TCI state is activated in CC#1, #2, #3.

[0058] Such simultaneous beam updating is considered to be applicable only to the single-TRP case.

[0059] For PDSCH, the UE may follow procedure A. [Step A] The UE receives an activation command to map up to eight TCI states to code points of the DCI field (TCI field) in one CC / DL BWP or in one set of CC / BWPs. If one set of TCI state IDs is activated for one set of CC / DL BWPs, then the applicable list of CCs is determined by the CC indicated in the activation command, and the same set of TCI states applies for all DL BWPs in the indicated CC. One set of TCI state IDs can be activated for one set of CC / DL BWPs only if the UE is not provided with different values ​​of CORESETPoolIndex in the CORESET information element (ControlResourceSet) and at least one TCI code point that maps to two TCI states.

[0060] For PDCCH, the UE may follow procedure B. [Step B] If the UE is provided with up to two lists of cells for simultaneous TCI state activation by simultaneous TCI update lists (at least one of simultaneousTCI-UpdateList-r16 and simultaneousTCI-UpdateListSecond-r16) via the simultaneous TCI cell list (simultaneousTCI-CellList), the UE applies antenna port quasi co-location (QCL) provided by TCI states with the same activated TCI state ID value for the CORESET with index p in all configured DL BWPs of all configured cells in one list determined from the serving cell index provided by the MAC CE command. A simultaneous TCI cell list can be provided for simultaneous TCI state activation only if the UE is not provided with different values ​​of CORESETPoolIndex in the CORESET information element (ControlResourceSet) and is not provided with at least one TCI codepoint that maps to two TCI states.

[0061] For semi-persistent (SP) / aperiodic (AP)-SRS, the UE may follow procedure C. [Step C] For a set of CCs / BWPs, when spatial relationship information (spatialRelationInfo) for SP or AP-SRS resources configured by the SRS resource information element (higher layer parameter SRS-Resource) is activated / updated by the MAC CE, then the applicable list of the CC is indicated by the simultaneous spatial update list (higher layer parameter simultaneousSpatial-UpdateList-r16 or simultaneousSpatial-UpdateListSecond-r16), and the spatial relationship information is applied to SP or AP-SRS resources with the same SRS resource ID in all BWPs within the indicated CC. The spatial relationship information (spatialRelationInfo) for SP or AP-SRS resources configured by the SRS resource information element (higher layer parameter SRS-Resource) for one set of CC / BWP is activated / updated by the MAC CE only if the UE is not provided with different values ​​of CORESETPoolIndex in the CORESET information element (ControlResourceSet) and is not provided with at least one TCI codepoint that maps to two TCI states.

[0062] The simultaneous TCI cell list (simultaneousTCI-CellList) and the simultaneous TCI update list (at least one of simultaneousTCI-UpdateList1-r16 and simultaneousTCI-UpdateList2-r16) are lists of serving cells whose TCI relationships can be updated simultaneously using the MAC CE. simultaneousTCI-UpdateList1-r16 and simultaneousTCI-UpdateList2-r16 do not include the same serving cell.

[0063] The simultaneous spatial update list (at least one of the upper layer parameters simultaneousSpatial-UpdatedList1-r16 and simultaneousSpatial-UpdatedList2-r16) is a list of serving cells whose spatial relationships can be updated simultaneously with the MAC CE. simultaneousSpatial-UpdatedList1-r16 and simultaneousSpatial-UpdatedList2-r16 do not contain the same serving cell.

[0064] Here, the simultaneous TCI update list and the simultaneous spatial update list are configured by the RRC, the CORESET pool index of the CORESET is configured by the RRC, and the TCI codepoint to be mapped to the TCI state is indicated by the MAC CE.

[0065] (unified / common TCI framework) According to the unified TCI framework, UL and DL channels can 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 (common TCI state) 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.

[0066] One common beam for both DL and UL, or one common beam for DL ​​and one common beam for UL (total of two common beams) are considered.

[0067] The UE may assume the same TCI state for UL and DL (joint TCI state, joint TCI pool, joint common TCI pool). The UE may assume different TCI states for UL and DL respectively (separate TCI state, separate TCI pool, UL separate TCI pool and DL separate TCI pool, separate common TCI pool, UL common TCI pool and DL common TCI pool).

[0068] The UL and DL default beams may be aligned via MAC CE based beam management (MAC CE level beam instructions). The default TCI state of the PDSCH may be updated to align with the default UL beam (spatial relationship).

[0069] A common beam / unified TCI state may be indicated from the same TCI pool (joint common TCI pool, joint TCI pool, set) for both UL and DL by DCI based beam management (DCI level beam indication). 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.

[0070] The TCI pool (set) may be multiple TCI states configured by RRC parameters, or multiple TCI states (active TCI states, active TCI pools, sets) activated by the MAC CE among multiple TCI states configured by RRC parameters. Each TCI state may be a QCL type A / D RS. SSB, CSI-RS, or SRS may be configured as the QCL type A / D RS.

[0071] In the example of FIG. 2A, the RRC parameters (information elements) configure multiple TCI states for both DL and UL. The MAC CE may activate multiple TCI states from the configured multiple TCI states. The DCI may indicate one of the activated multiple TCI states. The DCI may be a UL / DL DCI. The indicated TCI state may apply to at least one (or all) of the UL / DL channels / RS. One DCI may indicate both UL TCI and DL TCI.

[0072] In the example of FIG. 2A, a point may be one TCI state that applies to both the UL and DL, or it may be two TCI states that apply to the UL and DL, respectively.

[0073] At least one of the multiple TCI states configured by the RRC parameters and the multiple TCI states activated by the MAC CE may be referred to as a TCI pool (common TCI pool, joint TCI pool, TCI state pool). The multiple TCI states activated by the MAC CE may be referred to as an active TCI pool (active common TCI pool).

[0074] In the present disclosure, higher layer parameters (RRC parameters) for setting multiple TCI states may be referred to as configuration information for setting multiple TCI states, or simply as "configuration information." Also, in the present disclosure, being instructed to set one of multiple TCI states using DCI may mean receiving indication information instructing one of multiple TCI states included in DCI, or may simply mean receiving "instruction information."

[0075] In the example of Figure 2B, the RRC parameters configure multiple TCI states (joint common TCI pools) for both DL and UL. The MAC CE may activate multiple TCI states (active TCI pools) out of the configured multiple TCI states. Separate active TCI pools for each of the UL and DL may be configured / activated.

[0076] The DL DCI or new DCI format may select (indicate) one or more (e.g., one) TCI states. The selected TCI state may be applied to one or more (or all) DL channels / RS. The DL channels may be PDCCH / PDSCH / CSI-RS. The UE may determine the TCI state of each DL channel / RS using the TCI state behavior (TCI framework) of Rel. 16. The UL DCI or new DCI format may select (indicate) one or more (e.g., one) TCI states. The selected TCI state may be applied to one or more (or all) UL channels / RS. The UL channels may be PUSCH / SRS / PUCCH. Thus, different DCIs may indicate UL TCI and DL DCI separately.

[0077] The existing DCI format 1_2 / 1_2 may be used to indicate the common TCI status.

[0078] The common TCI framework may have separate TCI states for DL ​​and UL.

[0079] The common TCI framework may have separate TCI states for DL ​​and UL. It is not preferred to use DCI format 1_1 / 1_2 to indicate common TCI states for UL only.

[0080] (Unified TCI Framework for Carrier Aggregation (CA)) A unified TCI state framework for CA is being considered for NR Rel.17 and later. It is expected that the common TCI state instructed to the UE will be common between CCs (cells) (at least between CCs, QCL type D). This is because the existing specifications (Rel.15 / 16) do not support simultaneous reception of different DL channels / RSs in QCL type D and simultaneous transmission of UL channels / RSs with different spatial relationships, except for cases such as transmission and reception using multiple TRPs.

[0081] However, when instructing beam direction using individual MAC CE / DCI for each CC, there is a concern that signaling overhead will increase.

[0082] In addition, in the unified TCI framework, common TCI state ID update / activation is considered to provide common QCL information / common UL transmit spatial filter across a set of configured CCs.

[0083] The following options 1 and 2 are being considered for the TCI state pool for CA.

[0084] [Option 1] A single TCI state pool configured by RRC for a set of configured multiple CCs (cells) / BWPs may be shared (configured). For example, a cell group TCI state may be defined, or a TCI state pool for PDSCH in a reference cell may be reused. There may be no CC (cell) ID for a QCL type-A RS in the TCI state, and the CC (cell) ID for a QCL type-A RS may be determined according to the target CC (cell) of the TCI state.

[0085] In option 1, a common TCI state pool is configured for each of multiple CC / BWPs, so that when one common TCI state is indicated in the MAC CE / DCI, the indicated common TCI state may be applied to all CC / BWPs (all CC / BWPs included in the pre-configured CC / BWP list).

[0086] [Option 2] For each CC, a TCI state pool may be configured by the RRC.

[0087] In option 2, as in Rel.16, the applicable CC / BWP list for simultaneous beam updating is pre-configured by RRC, and if a beam update is performed in MAC CE / DCI in any of the CC / BWPs included in the CC / BWP list, the update may be applied to all CC / BWPs.

[0088] In option 1, a common TCI state pool is configured (shared) by RRC for multiple CCs, the TCI states in the common TCI state pool are indicated by a common TCI state ID, and one RS determined based on that TCI state is used to indicate QCL type D across the set of multiple configured CCs (Constraint 1).

[0089] In option 2, a separate common TCI state pool is configured by the RRC for each CC, the TCI states in the common state pool are indicated by a common TCI state ID, and one RS determined based on the TCI state is used to indicate QCL type D across the set of multiple configured CCs (Constraint 2).

[0090] (QCL setting constraints) As mentioned above, it is being considered to control the beams of multiple types of channels using a common beam instruction / activation (MAC CE / DCI) through a common TCI framework, but this control is performed for one CC (cell).

[0091] Simultaneous beam updating across multiple CCs, specified in Rel.16, allows beams of multiple BWPs / CCs to be updated with a single MAC CE beam instruction, thereby reducing beam control overhead.

[0092] In Rel.15 / 16, the QCL source RS (Type A RS and Type D RS) configured in the TCI state of the DMRS for PDCCH / DMRS for PDSCH is limited to the following cases (Case 1) to (Case 3): (Case 1) Type A RS is a tracking reference signal (TRS) (CSI-RS for which the higher layer parameter trs-Info is set), and type D RS is a CSI-RS equal to type A RS. (Case 2) Type A RS is a TRS, and type D RS is a CSI-RS with the higher layer parameter "repetition" set. (Case 3) The type A RS is a CSI-RS in which the higher layer parameter trs-Info is not set and the higher layer parameter repetition is not set, and the type D RS is a CSI-RS equivalent to the type A RS.

[0093] Therefore, the only case where Type A RS and Type D RS are different CSI-RS resources is the above case (Case 2).

[0094] Furthermore, the CSI-RS in which the higher layer parameter repetition is set may be configured to assist the UE in determining a receiving beam. However, the UE can determine a receiving beam without using the CSI-RS in which the higher layer parameter repetition is set.

[0095] On the other hand, since the network (NW, for example, a base station) transmits a TRS as a type A RS, it is considered that the above case (Case 1) in which it is used as a type D RS is generally used.

[0096] It is preferable to enable simultaneous beam updating across multiple CCs even in the common TCI framework. However, there are the following restrictions on setting the QCL between the DMRS for PDCCH / DMRS for PDSCH and the TRS in multiple CCs.

[0097] For example, the configuration shown in Fig. 3 is possible. Assume that CC#0, which is a special cell (SpCell) (primary cell (PCell) or primary secondary cell (PSCell)), and #1, #2, and #3, which are SCells, are configured, and SSB, TRS, and DMRS for PDCCH / DMRS for PDSCH (which may simply be called DMRS) are transmitted in each CC. In this case, the TRS of each CC is in a relationship of QCL types C and D with the SSB of CC#0, and the PDCCH of each CC is in a relationship of QCL types A and D with the TRS of the same CC.

[0098] For example, the setting shown in Fig. 4 is not possible. As in Fig. 3 above, if the TRS of each CC is in a QCL type C or D relationship with the SSB of CC#0 and the DMRS of each CC is in a QCL type A relationship with the TRS of the same CC, the DMRS of CC#1, 2, and 3 cannot be in a QCL type D relationship with the TRS of CC#0 (shown by dashed lines). If the TCI state of the DMRS for PDCCH / DMRS for PDSCH is TRS, the RS of QCL type A and the RS of QCL type D must be the same TRS.

[0099] When a TRS is set as a QCL type A / D RS in the TCI state of a CC, the TRS of another CC cannot be set as the QCL type A / D RS. Therefore, even when a common TCI pool or common TCI is set / updated / instructed between multiple CCs, the TCI state (TCI state including the QCL type A / D RS) is set for each CC.

[0100] When a CSI-RS is configured as a QCL type D RS in the TCI state of a CC, a CSI-RS of another CC may be configured as a QCL type D RS in the TCI state of a PDCCH / PDSCH of a CC. Even in this case, a CSI-RS / TRS of the same CC needs to be configured as a QCL type A RS in the TCI state. This is because the QCL type A RS indicates that the parameters that determine the channel characteristics, such as delay spread and average delay, are the same, and therefore the values ​​of these parameters may be different in different CCs.

[0101] The cell of the QCL type A RS must be the same as the cell of the DMRS for PDSCH / PDCCH with the TCI state set.

[0102] As mentioned above, if a QCL type D RS is a TRS, the QCL type D RS must be the same as a QCL type A RS. Combined with the above description, if a QCL type D RS is a TRS, the cell of the QCL type D RS must be the same as the cell of the DMRS for PDSCH / PDCCH with the TCI state set.

[0103] If a QCL type D RS is a CSI-RS with repetition configured (has CSI-RS resources in an NZP CSI-RS resource set with the upper layer parameter repetition configured (the upper layer parameter repetition is ON)), the cell of that QCL type D RS may be different from the cell of the DMRS for PDSCH / PDCCH with the TCI state configured.

[0104] Considering the above-mentioned constraints 1 and 2, the QCL source RS in the common TCI state is such that the QCL type A RS is the TRS for each CC (the CC of the DMRS to which the common TCI state is applied) and the QCL type D RS is the TRS for one CC. This means that the RS can only operate in case 2 in the above-mentioned QCL setting constraints (problem 1).

[0105] In addition, in the unified TCI state framework in CA, the TCI state is indicated by the MAC CE / DCI and the indicated TCI state is applied to multiple CC / BWPs. Therefore, applying the TCI state indicated by the DCI of a certain CC / BWP to multiple CC / BWPs may increase the complexity of UE operation (issue 2).

[0106] Furthermore, Fig. 5 is a diagram showing an example of a TCI status indication in a unified TCI status framework in CA. In the example shown in Fig. 5, the UE receives a TCI status indication for PDSCH in each of CC#1-#3 in CC#1. In this way, the DCI of a CC affects the transmission and reception of channels / signals of other CCs, which may increase the complexity of the UE since it requires support of an operation similar to cross-carrier scheduling. More specifically, in the example shown in Fig. 5, the indication for CC#2 and #3 in the DCI of CC#1 becomes a DCI indication across CCs, which may increase the processing time and implementation cost in the UE.

[0107] Thus, there is insufficient consideration on the method of setting / instructing the timing from the instruction of a beam (e.g., unified TCI state) using (based on) DCI to the application of the TCI state from the NW to the UE. Specifically, there is insufficient consideration on whether the start and end of the timing are determined in such a way. If this consideration is insufficient, it may lead to a deterioration in communication quality, a decrease in throughput, etc. (Issue 3).

[0108] Therefore, the present inventors came up with a method of setting and indicating a common beam (common TCI) across multiple BWPs / CCs, which solves the above problems 1 to 3.

[0109] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to the respective embodiments may be applied alone or in combination. Note that the embodiments for solving the above problems 1 and 2 are described in the first to fifth embodiments, and the embodiment for solving the above problem 3 is described in the sixth embodiment, but the embodiments of the present disclosure may be applied in combination.

[0110] In addition, in the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read as mutually interchangeable. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as mutually interchangeable. In the present disclosure, index, ID, indicator, and resource ID may be read as mutually interchangeable. In the present disclosure, support, control, can be controlled, operate, and can operate may be read as mutually interchangeable.

[0111] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read as interchangeable.

[0112] In the present disclosure, MAC CE and activation / deactivation command may be read as interchangeable.

[0113] 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.

[0114] 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.

[0115] 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, TCI assumption, QCL assumption, QCL parameter, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS 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.

[0116] UL DCI, DCI for scheduling a UL channel (e.g., 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.

[0117] In the present disclosure, HARQ-ACK information, ACK, and NACK may be interpreted as interchangeable.

[0118] In the present disclosure, the link direction, downlink (DL), uplink (UL), and one of UL and DL may be interpreted as interchangeable.

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

[0120] In the present disclosure, common beam, common TCI, common TCI state, unified TCI, unified TCI state, TCI state applicable to DL and UL, TCI state applicable to multiple (multiple types) channels / RS, TCI state applicable to multiple types of channels / RS, and PL-RS may be interpreted as interchangeable.

[0121] In the present disclosure, multiple TCI states set by RRC, multiple TCI states activated by a MAC CE, pool, TCI state pool, active TCI state pool, common TCI state pool, joint TCI state pool, separate TCI state pool, common TCI state pool for UL, common TCI state pool for DL, common TCI state pool set / activated by RRC / MAC CE, and TCI state information may be read as interchangeable.

[0122] 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, TCI assumption, QCL assumption, QCL parameter, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS 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.

[0123] In the present disclosure, panel, Uplink (UL) transmitting entity, point, TRP, spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, codeword, base station, antenna port of a certain signal (e.g., DeModulation Reference Signal (DMRS) port), antenna port group of a certain signal (e.g., DMRS port group), group for multiplexing (e.g., Code Division Multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CORESET subset, CW, redundancy version (RV), layer (MIMO layer, transmission layer, spatial layer), may be read as mutually interchangeable. Also, panel identifier (ID) and panel may be read as mutually interchangeable. In the present disclosure, TRP index, TRP ID, CORESET pool index, TCI state ordinal number (first, second) in two TCI states, and TRP may be read as mutually interchangeable.

[0124] In the present disclosure, the terms CC list, serving cell list, CC list in cell group configuration (CellGroupConfig), applicable list, simultaneous TCI update list / second simultaneous TCI update list, simultaneousTCI-UpdateList1-r16 / simultaneousTCI-UpdateList2-r16, simultaneous TCI cell list, simultaneousTCI-CellList, simultaneous spatial update list / second simultaneous spatial update list, simultaneousSpatial-UpdatedList1-r16 / simultaneousSpatial-UpdatedList2-r16, configured CC, configured list, BWP / CC in the configured list, all BWP / CC in the configured list, CC indicated by the activation command, indicated CC, CC that received MAC CE, and information indicating multiple cells for updating at least one of TCI state and spatial relationship may be read as interchangeable.

[0125] (Wireless communication method) In the present disclosure, DL TCI, DL common TCI, DL unified TCI, common TCI, and unified TCI may be interchangeable. In the present disclosure, UL TCI, UL common TCI, UL unified TCI, common TCI, and unified TCI may be interchangeable.

[0126] In the present disclosure, in the case of a joint TCI pool, "when a joint TCI pool is configured" and "when a separate TCI pool is configured" may be read as interchangeable.

[0127] In the present disclosure, when a joint TCI pool is configured, when the TCI pool configured for DL ​​and the TCI pool configured for UL are common, when a TCI pool for both DL and UL is configured, when one TCI pool (one set of TCIs) is configured, these terms may be read as interchangeable.

[0128] In the present disclosure, the following may be read as interchangeably: when a separate TCI pool is configured, when a TCI pool configured for DL ​​and a TCI pool configured for UL are different, when a TCI pool for DL ​​(first TCI pool, first TCI set) and a TCI pool for UL (second TCI pool, second TCI set) are configured, when multiple TCI pools (multiple sets of TCIs) are configured, when a TCI pool for DL ​​is configured, etc. When a TCI pool for DL ​​is configured, the TCI pool for UL may be equal to the configured TCI pool.

[0129] In the present disclosure, the channel / RS to which the common TCI is applied may be a PDSCH / HARQ-ACK information / PUCCH / PUSCH / CSI-RS / SRS.

[0130] In the present disclosure, the CC / BWP to which the unified TCI state applies, the subject to which the unified TCI state applies, and the subject to which the unified TCI state applies may be read as interchangeable.

[0131] In the present disclosure, the first QCL type and QCL type A may be interchangeable, and the second QCL type and QCL type D may be interchangeable.

[0132] In the following embodiments of the present disclosure, a pool including a plurality of unified TCI states may be configured / activated for a UE, and one or more of the plurality of unified TCI states may be indicated to the UE. The configuration / activation may be performed by configuration information transmitted via higher layer signaling (e.g., RRC signaling / MAC CE). The indication may be performed by indication information transmitted using DCI.

[0133] In addition, in the present disclosure, signaling configuration, signaling, setting, configuration, setting information, instructions, instruction information, etc. may be interpreted as mutually interchangeable.

[0134] <First embodiment> The UE may follow the QCL constraints described in at least one of the following embodiments 1-1 and 1-2 as a TCI state pool for CA.

[0135] <<Embodiment 1-1>> In embodiment 1-1, a single TCI state pool may be configured by the RRC for a set of multiple CCs (cells) / BWPs configured for the UE. In embodiment 1-1, the UE may follow at least one of Option 1-A and Option 1-B described below in configuring a second QCL type (e.g., QCL type D).

[0136] [Option 1-A] The UE may follow a specific QCL constraint different from the QCL constraint specified in Rel.16 described above. The QCL constraint may be such that, when the TCI state of the DMRS for PDCCH / DMRS for PDSCH is set, the TRS of the first QCL type (e.g., QCL type A) and the TRS of the second QCL type (e.g., QCL type D) are present, the TRS of the first QCL type and the TRS of the second QCL type may be different resources. The QCL constraint will be described in detail in the second embodiment below.

[0137] [Option 1-B] The UE may configure the second QCL type (e.g., QCL type D) according to the same method as the configuration method of the first QCL type (e.g., QCL type A). For example, there may be no CC (cell) / BWP ID for the QCL type D RS in the TCI state, and the CC (cell) / BWP ID for the QCL type D RS may be determined according to at least one of the target CC (cell) and the corresponding active BWP of the TCI state.

[0138] For example, for each active BWP applied per CC, the UE may locate the corresponding QCL Type D source RS using the corresponding BWP ID, CC ID and QCL Type D RS source ID.

[0139] <<Embodiment 1-2>> In embodiment 1-2, the TCI state pool may be configured by the RRC for each CC for the UE. In embodiment 1-2, the UE may follow at least one of Option 2-A and Option 2-B described below in configuring the second QCL type (e.g., QCL type D).

[0140] [Option 2-A] The UE may follow a specific QCL constraint different from the QCL constraint specified in Rel.16 described above. The QCL constraint may be such that, when the TCI state of the DMRS for PDCCH / DMRS for PDSCH is set, the TRS of the first QCL type (e.g., QCL type A) and the TRS of the second QCL type (e.g., QCL type D) are present, the TRS of the first QCL type and the TRS of the second QCL type may be different resources. The QCL constraint will be described in detail in the second embodiment below.

[0141] [Option 2-B] The UE may derive (determine) an RS of a second QCL type (eg, QCL type D) from the same ID as the ID of the TCI state set in each CC.

[0142] <Second embodiment> In the second embodiment, a QCL constraint different from the QCL constraint defined up to Rel. 16 will be described. In the present disclosure, the QCL constraint defined up to Rel. 16 may be called a first QCL constraint. Also, the QCL constraint different from the QCL constraint defined up to Rel. 16 may be called a second QCL constraint.

[0143] For a QCL source RS in a common TCI state, in addition to higher layer parameters (e.g., qcl_Type1) for the RS of a first QCL type (e.g., QCL type A), higher layer parameters (e.g., qcl_Type2) for a second QCL type (e.g., QCL type D) may be configured for the UE.

[0144] In a common TCI state, the RS of the first QCL type and the RS of the second QCL type may be different, for example, the UE may assume that the QCL type A RS and the QCL type D RS are configured differently.

[0145] In a common TCI state, when an RS of a first QCL type and an RS of a second QCL type are different, the case in which the RS of the first QCL type becomes a TRS and the RS of the second QCL type becomes a CSI-RS with repetition configured (having the higher layer parameter repetition) may be excluded.

[0146] The RS of the first QCL type and the RS of the second QCL type may be RSs in different CCs included in a common CC list. The RS of the first QCL type and the RS of the second QCL type may be RSs with the same RS ID or RSs with the same TCI ID in different CCs included in a common CC list. The RS of the first QCL type and the RS of the second QCL type may be RSs included in a common RS list / common TCI status list. According to these, the NW can appropriately configure / instruct the QCL type D RS with little control overhead without transmitting additional CSI-RS resources (e.g., CSI-RSs for which repetition is configured).

[0147] The following describes a second QCL constraint that can be configured for the UE. The UE may assume that the QCL source RSs (QCL type A RSs and QCL type D RSs) configured in the TCI state of the DMRS for PDCCH / DMRS for PDSCH comply with the following (Case 4) and (Case 5) in addition to / instead of the above-mentioned (Case 1) to (Case 3): (Case 4) The RS of the first QCL type is a TRS (CSI-RS with the higher layer parameter trs-Info set), and the RS of the second QCL type is a TRS (CSI-RS with the higher layer parameter trs-Info set). (Case 5) The RS of the first QCL type is a TRS (CSI-RS with the higher layer parameter trs-Info set), and the RS of the second QCL type is an SSB.

[0148] In addition, the source RS of the second QCL type in the TCI state of the DMRS for PDCCH / DMRS for PDSCH in each CC may be required to be the same RS between CCs.

[0149] (Case 4) In case 4, the RS of the first QCL type and the RS of the second QCL type may be different CSI-RS resources.

[0150] Fig. 6 is a diagram showing an example of QCL constraints in case 4. In the example shown in Fig. 6, the TRS of each CC has a relationship of QCL types C and D with the SSB of CC#0. The DMRS (DMRS for PDCCH / DMRS for PDSCH) of each CC has a relationship of QCL type A with the TRS of the same CC. In this case, the DMRS of each CC may have a relationship of QCL type D with the TRS of CC#0.

[0151] (Case 5) For the first QCL type RS, the TRS is configured for time-frequency tracking because the resource density is higher and more accurate time-frequency correction is possible with the TRS compared to SSB, while the second QCL type RS is utilized to obtain UL / DL (transmit / receive) spatial domain filters and can operate with the resource density of SSB.

[0152] Fig. 7 is a diagram showing an example of QCL constraints in case 5. In the example shown in Fig. 7, the TRS of each CC is in a QCL type C or D relationship with the SSB of CC#0. The DMRS (DMRS for PDCCH / DMRS for PDSCH) of each CC is in a QCL type A relationship with the TRS of the same CC. In this case, the DMRS of each CC may be in a QCL type D relationship with the SSB of CC#0.

[0153] <Third embodiment> In the third embodiment, the above-mentioned option 1-A will be described in detail. In the third embodiment, information (configuration information) regarding RSs of a first QCL type (e.g., QCL type A) notified to a UE may include a specific number of cell IDs (e.g., 4). The cell ID may include a parameter indicating a target cell (CC). Also, the configuration information may include a specific number of RS IDs (e.g., 64) (see FIG. 8).

[0154] In the present disclosure, the target cell may mean a cell of a QCL-related target RS (a cell of a DMRS using a TCI state, a cell using a DMRS to which a TCI state is applied, or a cell to which a TCI state is applied). In each embodiment of the present disclosure, a case is shown in which a parameter indicating a target cell is explicitly notified to a UE, but when a parameter indicating a target cell is not specified and a cell ID is not notified to a UE, the UE may determine that a target cell is implicitly indicated.

[0155] The UE may be notified of information (configuration information) related to RSs of a second QCL type (e.g., QCL type D). When the configuration information is notified to the UE, the configuration information may include a specific number (e.g., 4) of cell IDs. The cell ID may include a parameter indicating a target cell (CC). The configuration information may also include a specific number (e.g., 64) of RS IDs (see FIG. 8).

[0156] In addition, in Rel.15, the QCL type A RS is the only RS for which the TCI state is set. In other words, the cell ID of the QCL type A RS cannot be set to a cell other than the target cell. Therefore, the information on the first QCL type RS notified to the UE may not include the cell ID, but may include a specific number of RS IDs (e.g., 64).

[0157] In the example of Fig. 8, the number of cell IDs included in the information on the RS of each QCL type is 4, and the number of pieces of information on the RS ID is 64, but the numbers are not limited to these. Also, the numbers may be different for each QCL type, or may be the same.

[0158] The UE may assume that the RS of the second QCL type of each CC is set to the RS of the second QCL type common between the CCs. The NW may set the RS of the second QCL type of each CC to the RS of the second QCL type common between the CCs (embodiment 3-1).

[0159] The UE may assume that the RS of the second QCL type of each CC is not explicitly configured / indicated. The NW may not explicitly configure / indicate the RS of the second QCL type of each CC (embodiment 3-2).

[0160] In embodiment 3-2, the RS ID of the RS of the second QCL type may not be explicitly set / indicated to the UE. The UE may determine that the RS of the first QCL type indicated by the cell ID and RS ID of the RS of the first QCL type in the cell ID of the RS of the second QCL type is the RS of the second QCL type.

[0161] Also, in embodiment 3-2, the cell ID of the RS of the second QCL type may not be explicitly set / indicated to the UE. The UE may determine the cell ID of the RS of the second QCL type based on a specific rule. The specific rule may be to determine the minimum (or maximum) cell ID / BWP ID included in the CC list as the cell ID of the RS of the second QCL type.

[0162] In addition, in embodiment 3-2, the RS ID and cell ID of the RS of the second QCL type may not be explicitly configured / indicated to the UE. The UE may determine the RS ID and cell ID of the RS of the second QCL type based on the RS of the first QCL type that is configured / indicated and the above-mentioned specific rule.

[0163] At this time, the UE needs to recognize whether the RS of the second QCL type is configured. That is, when the RS of the second QCL type is configured, the UE needs to determine the UL / DL spatial domain filter based on the configured RS of the second QCL type. Therefore, the UE may receive information regarding whether the RS of the second QCL type is configured, and may be instructed as to whether the RS of the second QCL type is configured.

[0164] For example, in the unified TCI state framework, when the upper layer parameters for the RS of the second QCL type are set to enabled (e.g., enable), the UE may determine that the RS of the second QCL type is configured and may determine the UL / DL spatial domain filters. In this case, the UE may determine the second QCL type RS to be used based on the above-mentioned method.

[0165] In the above-mentioned embodiment 3-2, the case where the RS of the second QCL type is TRS (CSI-RS), that is, corresponds to the above-mentioned (case 4). On the other hand, the above-mentioned embodiment 3-2 may be applied to the case where the RS of the second QCL type is SSB, that is, the above-mentioned (case 5) (embodiment 3-3). That is, the UE may determine to use SSB for the RS of the second QCL type.

[0166] In embodiment 3-3, the RS ID of the RS of the second QCL type may not be explicitly set / indicated to the UE. The UE may determine that the SSB in the cell ID of the RS of the second QCL type is the RS of the second QCL type.

[0167] Also, in embodiment 3-3, the cell ID of the RS of the second QCL type may not be explicitly set / indicated to the UE. The UE may determine the cell ID of the RS of the second QCL type based on a specific rule. The specific rule may be to determine the minimum (or maximum) cell ID / BWP ID included in the CC list as the cell ID of the RS of the second QCL type.

[0168] In addition, in embodiment 3-3, the RS ID and cell ID of the RS of the second QCL type may not be explicitly set / indicated to the UE. The UE may determine the RS ID and cell ID of the RS of the second QCL type based on the set / indicated SSB and the above-mentioned specific rule.

[0169] At this time, the UE needs to recognize whether the RS of the second QCL type is configured. That is, when the RS of the second QCL type is configured, the UE needs to determine the UL / DL spatial domain filter based on the configured RS of the second QCL type. Therefore, the UE may receive information regarding whether the RS of the second QCL type is configured, and may be instructed as to whether the RS of the second QCL type is configured.

[0170] For example, in the unified TCI state framework, when the upper layer parameters for the RS of the second QCL type are set to enabled (e.g., enable), the UE may determine that the RS of the second QCL type is configured and may determine the UL / DL spatial domain filters. In this case, the UE may determine the RS of the second QCL type to be used based on the above-mentioned method.

[0171] According to the above third embodiment, even when a single TCI state pool configured by RRC for a set of multiple CCs (cells) / BWPs is configured for a UE, an RS of the second QCL type can be appropriately determined.

[0172] <Fourth embodiment> In the fourth embodiment, the above-mentioned option 2-A will be described in detail. In the above-mentioned option 2-A, a common TCI status pool is set for each CC / BWP.

[0173] The UE may assume that the RS of the second QCL type (e.g., QCL type D) in the common TCI state pool of each CC is configured in common between the CCs. The NW may configure the RS of the second QCL type in the common TCI state pool of each CC to the RS of the second QCL type common between the CCs (embodiment 4-1).

[0174] Fig. 9 is a diagram showing an example of setting a QCL type D RS according to embodiment 4-1. In the example shown in Fig. 9, the TRS of each CC is in a QCL type C or D relationship with the SSB of CC#0. The DMRS (DMRS for PDCCH / DMRS for PDSCH) of each CC is in a QCL type A relationship with the TRS of the same CC. In this case, the DMRS of each CC may be in a QCL type D relationship with the TRS of CC#0.

[0175] Also, the UE may assume that the RS of the second QCL type in the common TCI state pool of each CC is not explicitly configured / indicated between each CC. The NW may not explicitly configure / indicate the RS of the second QCL type in the common TCI state pool of each CC between each CC (embodiment 4-2).

[0176] In embodiment 4-2, the RS ID of the RS of the second QCL type may not be explicitly set / indicated to the UE. The UE may determine that the RS or SSB of the first QCL type (e.g., QCL type A) in the cell ID of the RS of the second QCL type is the RS of the second QCL type.

[0177] Also, in embodiment 4-2, the cell ID of the RS of the second QCL type may not be explicitly set / indicated to the UE. The UE may determine the cell ID of the RS of the second QCL type based on a specific rule. The specific rule may be to determine the minimum (or maximum) cell ID / BWP ID included in the CC list as the cell ID of the RS of the second QCL type.

[0178] In addition, in embodiment 4-2, the RS ID and cell ID of the RS of the second QCL type may not be explicitly set / indicated to the UE. The UE may determine the RS ID and cell ID of the RS of the second QCL type based on the RS or SSB of the first QCL type that is set / indicated and the above-mentioned specific rule.

[0179] At this time, the UE needs to recognize whether the RS of the second QCL type is configured. That is, when the RS of the second QCL type is configured, the UE needs to determine the UL / DL spatial domain filter based on the configured RS of the second QCL type. Therefore, the UE may receive information regarding whether the RS of the second QCL type is configured, and may be instructed as to whether the RS of the second QCL type is configured.

[0180] For example, in the unified TCI state framework, when the upper layer parameters for the RS of the second QCL type are set to enabled (e.g., enable), the UE may determine that the RS of the second QCL type is configured and may determine the UL / DL spatial domain filters. In this case, the UE may determine the RS of the second QCL type to be used based on the above-mentioned method.

[0181] According to the fourth embodiment described above, even when a TCI status pool is configured for a UE by RRC for each individual CC, an RS of the second QCL type can be appropriately determined.

[0182] <Fifth embodiment> In the fifth embodiment, the above-mentioned option 2-B will be described in detail. In the above-mentioned option 2-B, a common TCI status pool is set for each CC / BWP, similarly to option 2-A.

[0183] The UE may use a common TCI state pool configured for each CC / BWP to use an RS of a second QCL type (e.g., QCL type D) for each common TCI state. The QCL source RS of the DMRS (DMRS for PDCCH / DMRS for PDSCH) for each CC / BWP may be constrained to be in a QCL type D relationship for each CC / BWP.

[0184] Fig. 10 is a diagram showing an example of setting a QCL type D RS according to the fifth embodiment. In the example shown in Fig. 10, the TRS of each CC is in a QCL type C or D relationship with the SSB of CC#0. The DMRS (DMRS for PDCCH / DMRS for PDSCH) of each CC is in a QCL type A relationship with the TRS of the same CC. In this case, the DMRS of each CC may be in a QCL type D relationship with the TRS of the same CC. In this way, in the fifth embodiment, the TRS of each CC / BWP may be set to a common SSB as an "associated SSB".

[0185] According to the above-described fifth embodiment, even when a TCI state pool is configured by RRC for each individual CC for a UE, it is possible to appropriately determine an RS of the second QCL type while ensuring compatibility with Rel.15.

[0186] Sixth embodiment In the sixth embodiment, the timing from instruction of a beam based on DCI (eg, a common TCI state) to application of the beam will be described.

[0187] In the present disclosure, these terms may be read interchangeably as the timing from the instruction of a DCI-based beam (e.g., a common TCI state) to the application of the beam, beam application time, period until beam application, etc.

[0188] Furthermore, in the present disclosure, the start timing of the beam application time may be the timing (e.g., symbol, slot, or specific time unit) of starting (or ending) reception of DCI instructing application of a beam (e.g., common TCI state). Furthermore, the start timing of the beam application time may be the timing (e.g., symbol, slot, or specific time unit) of starting (or ending) transmission of HARQ-ACK information for DCI instructing application of a beam (e.g., common TCI state).

[0189] In addition, the DCI instructing the application of a beam may use any DCI format defined up to Rel. 16, or may use a new DCI format defined in Rel. 17 or later.

[0190] In the present disclosure, the beam application time for a CC / BWP that receives a DCI instructing application of a beam may be referred to as a first beam application time. Also, the beam application time for a CC / BWP different from the CC / BWP that receives a DCI instructing application of a beam may be referred to as a second beam application time (see FIG. 11).

[0191] The UE may assume that the first beam application time and the second beam application time are specified / set / instructed to be the same / different. For example, the UE may assume that the second beam application time is specified / set / instructed to be longer (or shorter) than the first beam application time or equal to the first beam application time (embodiment 6-1).

[0192] Furthermore, when the UE operates the unified TCI state framework in CA, it may assume that the beam application times of multiple (e.g., all) CCs included in a list of CCs to which the unified TCI state is applied (applied CC list) are equally specified / set / instructed (embodiment 6-2). According to this method, it is possible to avoid a situation in which CA cannot be performed appropriately due to the beam application times being different for each CC, resulting in different TCI states for each CC.

[0193] The UE may assume that a beam application time is specified / set / instructed to be the same as the longest beam application time among the beam application times for each CC included in the applied CC list.

[0194] The UE may also assume that a beam application time is specified / set / instructed to be the same as the shortest beam application time among the beam application times for each CC included in the applied CC list.

[0195] <<How to set / instruct beam application time>> [Method 1] The UE may be configured with a beam application time for each CC / for each BWP in a CC. The UE may receive information regarding the configuration of the beam application time for each CC / for each BWP in a CC using higher layer signaling (e.g., RRC signaling).

[0196] In this case, the beam application time for each CC / BWP may be different or may be a common value.

[0197] [Method 2] Also, the UE may be configured with a beam application time for each band (or for each of multiple CCs / BWPs). The UE may receive information regarding the setting of the beam application time for each of multiple CCs / BWPs using higher layer signaling (e.g., RRC signaling).

[0198] The beam application time for each CC / BWP may be different or may be a common value. For example, the beam application time applicable to all CCs may be calculated based on the process time of the UE in each CC, and the beam application time for each CC / BWP may be a common value.

[0199] If the beam application time for each CC / BWP is different, the UE may receive information about the beam application time for each CC / BWP.

[0200] Also, when the beam application time for each CC / BWP is different, the UE may receive information on the beam application time for a CC / BWP and determine the beam application time for another CC / BWP based on a specific rule. For example, the UE may receive information on a first beam application time and determine a second beam application time based on a specific rule.

[0201] The particular rule may be that a particular offset value for the first beam application time is notified to the UE, and the UE determines the second beam application time by adding / subtracting the particular offset value to the first beam application time.

[0202] The specific offset value may be configured for the UE by higher layer signaling, may be predefined in a specification, or may be reported to the NW as UE capability information.

[0203] [Method 3] The UE may be configured with a beam application time for each applied CC list. The UE may receive information regarding the setting of the beam application time for each applied CC list using higher layer signaling (e.g., RRC signaling). According to method 3, it is possible to handle a situation in which the beam application time differs depending on the number and band of CCs included in each applied CC list.

[0204] [Method 4] The UE may be configured with a beam application time for each common TCI state. The UE may receive information regarding the setting of the beam application time for each common TCI state using higher layer signaling (e.g., RRC signaling) / DCI. According to method 4, a different beam application time can be set for each TCI state to be indicated, and the beam application time can be indicated by DCI.

[0205] Seventh embodiment In a unified TCI state in CA, the UE may be instructed on which CC the TCI state applies for each DCI.

[0206] At this time, the DCI may include information indicating the CC / BWP to which the TCI state is applied. For example, one or more applicable CC lists may be configured in advance for the UE by higher layer signaling, and the applicable CC may be dynamically switched by indicating one of the lists by the DCI.

[0207] Also, a UE may be scheduled for PDSCHs of multiple CCs by one DCI, and the DCI may dynamically indicate the CC / BWP to which the TCI state should be applied.

[0208] Fig. 12 is a diagram showing an example of a TCI state indication for multiple CCs by one DCI. In Fig. 12, a UE receives DCI#1 that schedules PDSCH#1 in CC#1 and PDSCH#3 in CC#3. The UE also receives DCI#2 that schedules PDSCH#4 in CC#1, PDSCH#5 in CC#2, and PDSCH#6 in CC#3. DCI#1 includes a TCI state indication (indication information)#1 that indicates the TCI state to be applied to PDSCH#1 (DMRS for PDSCH#1) and the TCI state to be applied to PDSCH#3 (DMRS for PDSCH#3). DCI#2 also includes TCI instruction #2 indicating the TCI state to be applied to PDSCH#4 (DMRS for PDSCH#4), the TCI state to be applied to PDSCH#5 (DMRS for PDSCH#5), and the TCI state to be applied to PDSCH#6 (DMRS for PDSCH#6). The UE determines the TCI state to be applied to each PDSCH (DMRS for PDSCH) based on the TCI state instruction included in the DCI.

[0209] According to the seventh embodiment described above, it becomes possible to apply a unified TCI state more flexibly and dynamically than by using DCI.

[0210] <Eighth embodiment> A higher layer parameter (RRC information element) / UE capability corresponding to at least one function (feature) in the first to seventh embodiments may be defined. The UE capability may indicate that the function is supported.

[0211] A UE in which a higher layer parameter corresponding to the function is configured may perform the function. It may be specified that "a UE in which a higher layer parameter corresponding to the function is not configured does not perform the function."

[0212] A UE that has reported a UE capability indicating that it supports the function may perform the function. It may also be specified that "a UE that has not reported a UE capability indicating that it supports the function shall not perform the function."

[0213] If the UE reports a UE capability indicating that the UE supports the function and a corresponding upper layer parameter is configured, the UE may perform the function. It may also be specified that "if the UE does not report a UE capability indicating that the UE supports the function or a corresponding upper layer parameter is not configured, the UE shall not perform the function."

[0214] The function may be a unified TCI state framework in a CA or a unified TCI state framework applied to multiple CC / BWPs.

[0215] For example, the UE capability / higher layer parameters may be defined in a unified TCI state framework in terms of the number of unified TCI states that may be set by RRC signaling.

[0216] Also, for example, the UE capability / higher layer parameter may be defined in terms of the number of active unified TCI states that can be configured by the MAC CE in a unified TCI state framework.

[0217] Also, for example, the UE capability / higher layer parameters may be defined as whether the UE supports at least one of case 4 and case 5 above.

[0218] Also, for example, the UE capability / higher layer parameters may be specified as to whether or not the DCI can indicate a unified TCI state that applies to one or more CCs / BWPs. If the DCI cannot indicate a unified TCI state that applies to one or more CCs / BWPs, the UE may support only the unified TCI state framework based on the MAC CE in one CC. In other words, the UE may not assume (expect) to indicate the unified TCI state in the DCI that performs beam indication when the unified TCI state applies to multiple BWPs / CCs.

[0219] According to the eighth embodiment, the UE can achieve the above functions while maintaining compatibility with existing specifications.

[0220] (Wireless communication systems) 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.

[0221] 13 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).

[0222] 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.

[0223] 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.

[0224] 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))).

[0225] 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.

[0226] 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).

[0227] 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.

[0228] 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).

[0229] 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.

[0230] 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.

[0231] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0232] 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.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] 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).

[0237] 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.

[0238] 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.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] 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.

[0243] 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.

[0244] 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.

[0245] 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).

[0246] (base station) 14 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.

[0247] 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 processing of each unit described below may be omitted.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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 .

[0258] 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 .

[0259] 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.

[0260] 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.

[0261] 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.

[0262] 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.

[0263] The transceiver 120 may transmit a list of a plurality of serving cells or a plurality of bandwidth portions, and may transmit configuration information of a plurality of transmission configuration indication (TCI) states applicable to a plurality of types of channels. The control unit 110 may determine the first quasi-co-location (QCL) type reference signal and the second QCL type reference signal to be applied to the plurality of serving cells or the plurality of bandwidth portions based on a constraint on the first QCL type reference signal and the second QCL type reference signal for a demodulation reference signal (DMRS) and the configuration information (first to fifth embodiments).

[0264] The transceiver 120 may transmit downlink control information (DCI) indicating one or more transmission configuration indication (TCI) states applicable to multiple types of channels of multiple serving cells. The control unit 110 may determine a period until application of the one or more TCI states based on the transmission timing of the DCI or the reception timing of a Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) for the DCI (sixth embodiment).

[0265] (User terminal) 15 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.

[0266] 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.

[0267] 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.

[0268] 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.

[0269] 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.

[0270] 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.

[0271] 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.

[0272] 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.

[0273] 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.

[0274] 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.

[0275] 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.

[0276] 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.

[0277] 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.

[0278] 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.

[0279] 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.

[0280] 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.

[0281] 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.

[0282] The transceiver 220 may receive a list of a plurality of serving cells or a plurality of bandwidth portions, and may receive configuration information of a plurality of transmission configuration indication (TCI) states applicable to a plurality of types of channels. The controller 210 may determine a reference signal of the first quasi-co-location (QCL) type and a reference signal of the second QCL type to be applied to the plurality of serving cells or the plurality of bandwidth portions based on a constraint on a reference signal of the first quasi-co-location (QCL) type and a reference signal of the second QCL type for a demodulation reference signal (DMRS) and the configuration information (first to fifth embodiments).

[0283] The reference signal of the first QCL type and the reference signal of the second QCL type may be different (second embodiment).

[0284] The reference signals of the second QCL type in multiple serving cells or multiple bandwidth portions may be a common reference signal (third and fourth embodiments).

[0285] The transceiver 220 may receive information about the reference signal of the first QCL type. The controller 210 may determine the reference signal of the second QCL type based on the information about the reference signal of the first QCL type (third to fifth embodiments).

[0286] The transceiver 220 may receive downlink control information (DCI) indicating one or more transmission configuration indication (TCI) states applicable to multiple types of channels of multiple serving cells. The controller 210 may determine a period until application of the one or more TCI states based on a reception timing of the DCI or a transmission timing of a Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) for the DCI (sixth embodiment).

[0287] The control unit 210 may assume that the period until the TCI state is applied to a serving cell that receives the DCI and the period until the TCI state is applied to serving cells other than the serving cell that receives the DCI can be set to different lengths (sixth embodiment).

[0288] Control unit 210 may determine the period until the TCI state is applied to serving cells other than the serving cell receiving the DCI, based on the period until the TCI state is applied to the serving cell receiving the DCI (sixth embodiment).

[0289] The period until the TCI state is applied may be set for each serving cell, or the period until the TCI state is applied may be set for each of a plurality of serving cells (sixth embodiment).

[0290] (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.

[0291] 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.

[0292] 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. 16 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.

[0293] 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.

[0294] 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.

[0295] 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.

[0296] 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.

[0297] 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.

[0298] 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.

[0299] 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.

[0300] 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.

[0301] 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).

[0302] 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.

[0303] 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.

[0304] (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.

[0305] 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.

[0306] 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.

[0307] 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.

[0308] 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.

[0309] 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.

[0310] 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.

[0311] 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.

[0312] 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.

[0313] 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.

[0314] 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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.

[0320] 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.

[0321] 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.

[0322] 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".

[0323] 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.

[0324] 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.

[0325] 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.

[0326] 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.

[0327] 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.

[0328] 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.

[0329] 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.

[0330] 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).

[0331] 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).

[0332] 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).

[0333] 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.

[0334] 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.

[0335] 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).

[0336] 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.

[0337] 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.

[0338] 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.

[0339] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0340] 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.

[0341] 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.

[0342] 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, "sidelink"). For example, an uplink channel, a downlink channel, etc. may be read as a sidelink channel.

[0343] 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.

[0344] 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.

[0345] 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.

[0346] 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).

[0347] 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."

[0348] 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.

[0349] 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.

[0350] 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.

[0351] 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.

[0352] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0353] 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.

[0354] 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."

[0355] 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.

[0356] 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."

[0357] 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.

[0358] 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.

[0359] 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 list of a plurality of serving cells and receiving configuration information of a plurality of transmission configuration indication (TCI) states applicable to a plurality of types of channels; a control unit that determines RSs of the first quasi-co-location (QCL) type and RSs of the second QCL type to be applied to the plurality of serving cells based on a constraint on RSs of a first quasi-co-location (QCL) type and RSs of a second QCL type for a demodulation reference signal (DMRS) and the configuration information; A terminal, wherein an RS in a serving cell to which a TCI state is applied by the terminal is configured as the RS of the first QCL type, and an RS in a serving cell other than the serving cell to which a TCI state is applied by the terminal is configured as the RS of the second QCL type.

2. The terminal of claim 1 , wherein the first QCL type is a QCL type related to delay spread, and the second QCL type is a QCL type related to spatial reception parameters.

3. The terminal of claim 1 , wherein the first QCL type RS and the second QCL type RS are different.

4. The terminal according to claim 1 , wherein the RS of the second QCL type is common among serving cells in the plurality of serving cells.

5. receiving a list of a plurality of serving cells and receiving configuration information of a plurality of transmission configuration indication (TCI) states applicable to a plurality of types of channels; determining RSs of the first quasi-co-location (QCL) type and RSs of the second QCL type to be applied to the plurality of serving cells based on a constraint on RSs of a first quasi-co-location (QCL) type and RSs of a second QCL type for a demodulation reference signal (DMRS) and the configuration information; A wireless communication method for a terminal, in which an RS in a serving cell to which a TCI state is applied by the terminal is configured as the RS of the first QCL type, and an RS in a serving cell other than the serving cell to which a TCI state is applied by the terminal is configured as the RS of the second QCL type.

6. A transmitter that transmits a list of a plurality of serving cells and transmits configuration information of a plurality of transmission configuration indication (TCI) states applicable to a plurality of types of channels; a control unit that determines RSs of the first quasi-co-location (QCL) type and RSs of the second QCL type to be applied to the plurality of serving cells based on a constraint on RSs of a first quasi-co-location (QCL) type and RSs of a second QCL type for a demodulation reference signal (DMRS) and the configuration information; A base station in which an RS in a serving cell to which a TCI state is applied by a terminal is configured as the RS of the first QCL type, and an RS in a serving cell other than the serving cell to which a TCI state is applied by the terminal is configured as the RS of the second QCL type.

7. A system having a terminal and a base station, The terminal includes: A receiver for receiving a list of a plurality of serving cells and receiving configuration information of a plurality of transmission configuration indication (TCI) states applicable to a plurality of types of channels; a control unit that determines RSs of the first quasi-co-location (QCL) type and RSs of the second QCL type to be applied to the plurality of serving cells based on a constraint on RSs of a first quasi-co-location (QCL) type and RSs of a second QCL type for a demodulation reference signal (DMRS) and the configuration information; The base station, a transmitter for transmitting the list and the setting information; A system in which an RS in a serving cell to which a TCI state is applied by a terminal is configured as the RS of the first QCL type, and an RS in a serving cell other than the serving cell to which a TCI state is applied by the terminal is configured as the RS of the second QCL type.

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