Terminal, wireless communication method, and base station

Abstract

A terminal according to an aspect of the present disclosure comprises: a reception unit that receives a plurality of commands indicating a plurality of transmission configuration indicator (TCI) states associated with a plurality of groups of resource sets for monitoring downlink control channels, and receives at least one downlink control information item in at least one group of the plurality of groups; and a control unit that controls reception or transmission using at least one TCI state which is among the plurality of TCI states and is indicated by said at least one downlink control information item. The plurality of groups are associated with a plurality of cell identifiers.

Description

Terminal, wireless communication method and base station

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

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

[0004] 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

[0005] In future wireless communication systems (e.g., NR, 6G, etc.), it is being considered that terminals (user terminals, User Equipment (UE)) will perform cell-free communication, in which they communicate using units different from existing cells.

[0006] However, specific consideration of cell-free communication has not been sufficiently carried out, and if this consideration is insufficient, there is a risk that improvements in communication quality / communication throughput will be hindered.

[0007] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that perform appropriate communication using a unit different from that of existing cells.

[0008] A terminal according to one aspect of the present disclosure includes a receiving unit that receives a plurality of commands indicating a plurality of transmission configuration indicator (TCI) states associated with a plurality of groups of resource sets for monitoring a downlink control channel, and receives one or more downlink control information in one or more groups among the plurality of groups, respectively; and a control unit that controls reception or transmission using one or more TCI states among the plurality of TCI states, the one or more TCI states being indicated by the one or more downlink control information, and the plurality of groups are associated with a plurality of cell identifiers.

[0009] According to one aspect of the present disclosure, appropriate communication is performed using a unit different from that of existing cells.

[0010] FIGS. 1A and 1B are diagrams illustrating an overview of MIMO. FIGS. 2A and 2B are diagrams illustrating an overview of a cellular system and a cell-free system. FIGS. 3A to 3C are diagrams illustrating an example of an overview of each assumed cell-free configuration. FIG. 4 illustrates an example of a TCI status list according to option 1 of embodiment 1. FIG. 5 illustrates an example of a TCI status list according to option 2-1 of embodiment 1. FIG. 6 illustrates an example of a TCI status list according to option 2-2 of embodiment 1. FIG. 7 illustrates an example of mapping between active TCI statuses and code points in the TCI field according to option 1 of embodiment 2. FIG. 8 illustrates an example of mapping between active TCI statuses and code points in the TCI field according to option 2 of embodiment 2. FIG. 9 illustrates an example of mapping between active TCI statuses and code points in the TCI field according to option 3 of embodiment 2. FIG. 10 illustrates an example of mapping between active TCI statuses and code points in the TCI field according to option 4 of embodiment 2. FIG. 11 shows an example of mapping between active TCI states and code points in the TCI field according to option 1 of embodiment 3. FIG. 12 shows an example of mapping between active TCI states and code points in the TCI field according to option 2 of embodiment 3. FIG. 13 shows an example of mapping between active TCI states and code points in the TCI field according to option 3 of embodiment 3. FIG. 14 shows an example of mapping between active TCI states and code points in the TCI field according to option 4 of embodiment 3. FIG. 15 shows an example of updating the active TCI state according to embodiment 4. FIG. 16 shows another example of updating the active TCI state according to embodiment 4. FIGS. 17A to 17C show an example of indication of the TCI state used for transmission according to embodiment 4. FIG. 18 shows an example of mapping between active TCI states and code points in the TCI field according to option 1 of embodiment 5. FIG. 19 shows an example of updating a subset of the active TCI state according to option 1 of embodiment 6. FIG. 20 illustrates an example of updating a subset of active TCI states according to option 2 of embodiment 6.Fig. 21 illustrates an example of updating a subset of active TCI states according to option 3 of embodiment 6. Fig. 22 illustrates an example of a schematic configuration of a wireless communication system according to an embodiment. Fig. 23 illustrates an example of a configuration of a base station according to an embodiment. Fig. 24 illustrates an example of a configuration of a user terminal according to an embodiment. Fig. 25 illustrates an example of hardware configurations of a base station and a user terminal according to an embodiment. Fig. 26 illustrates an example of a vehicle according to an embodiment.

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

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

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

[0014] The QCL is an index indicating the statistical properties of signals / channels. For example, if a signal / channel has a QCL relationship with another signal / channel, it may mean that it can be assumed that at least one of the following parameters is the same between these different signals / channels (i.e., the QCL is true for at least one of the following parameters): Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter).

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

[0016] A plurality of types of QCLs (QCL types) may be defined. For example, four QCL types A to D may be provided, each having different parameters (or parameter sets) that can be assumed to be the same.

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

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

[0019] The TCI state may be, for example, information about the QCL between the 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 thereof.

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

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

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

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

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

[0025] In the present disclosure, the following may be read interchangeably: a port (antenna port) of a signal (resource, channel) is QCL'd with an RS (DL RS, QCL source RS); there is a QCL relationship between a port of a signal and an RS; a signal is QCL'd with an RS; a signal is QCL'd with an RS in a TCI state; a signal is QCL'd with an RS in a TCI state for a specific QCL type; a signal is associated with a TCI state; a TCI state is set / indicated for a signal; and a UE assumes that a port of a signal is QCL'd with an RS in a TCI state.

[0026] In the present disclosure, beam, SD beam, spatial domain index, precoding, precoder, quasi co-location (QCL) assumption, QCL relationship, transmission configuration indicator (TCI) state, spatial domain filter, spatial domain receive filter, spatial domain transmit filter, reference signal (RS), and spatial receive parameter may be interpreted as interchangeable.

[0027] (Unified / Common TCI Framework) The unified TCI framework allows multiple types of channels / RSs (UL / DL) to be controlled by a common framework. The unified TCI framework does not specify TCI states or spatial relationships for each channel as in Rel. 15. Instead, it may specify a common beam (common TCI state) and apply it to all UL and DL channels, or it may apply a common beam for UL to all UL channels and a common beam for DL ​​to all DL channels.

[0028] One common beam for both DL and UL, or one common beam for DL ​​and one common beam for UL (two common beams overall) are considered.

[0029] The UE may assume the same TCI state for UL and DL (joint TCI state, joint TCI pool, joint common TCI pool, joint TCI state set). The UE may assume different TCI states for UL and DL (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).

[0030] The default beams for UL and DL may be aligned via MAC CE based beam management (MAC CE level beam indication). The default TCI state of the PDSCH may be updated to align with the default UL beam (spatial relationship).

[0031] DCI-based beam management (DCI-level beam indication) may indicate a common beam / unified TCI state from the same TCI pool for both UL and DL (joint common TCI pool, joint TCI pool, set). X (>1) TCI states may be activated by the MAC CE. The UL / DL DCI may select one from the X active TCI states. The selected TCI state may apply to both UL and DL channels / RS.

[0032] 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 MAC CE among the 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.

[0033] The number of TCI states corresponding to each of one or more TRPs may be specified. For example, the number N (≧1) of TCI states applied to UL channels / RSs (UL TCI states) and the number M (≧1) of TCI states applied to DL channels / RSs (DL TCI states) may be specified. At least one of N and M may be notified / configured / instructed to the UE via higher layer signaling / physical layer signaling.

[0034] In the present disclosure, when N=M=X (X is any integer), it may mean that X TCI states (joint TCI states) common to UL and DL (corresponding to X TRPs) are notified / configured / indicated to the UE. Also, when N=X (X is any integer) and M=Y (Y may be any integer, Y=X), it may mean that X UL TCI states (corresponding to X TRPs) and Y DL TCI states (i.e., separate TCI states) (corresponding to Y TRPs) are notified / configured / indicated to the UE.

[0035] For example, when N=M=1 is written, this may mean that a TCI state common to one UL and DL for a single TRP is notified / configured / indicated to the UE (joint TCI state for a single TRP).

[0036] Also, for example, when N=1 and M=1 are written, this may mean that one UL TCI state and one DL TCI state for a single TRP are separately notified / configured / instructed to the UE (separate TCI states for a single TRP).

[0037] Also, for example, when N=M=2 is written, this may mean that a TCI state common to multiple (two) ULs and DLs for multiple (two) TRPs is notified / configured / instructed to the UE (joint TCI state for multiple TRPs).

[0038] Also, for example, when N=2 and M=2, it may mean that multiple (two) UL TCI states and multiple (two) DL TCI states for multiple (two) TRPs are notified / configured / instructed to the UE (separate TCI states for multiple TRPs).

[0039] In the above example, the values ​​of N and M are 1 or 2, but the values ​​of N and M may be 3 or more, and N and M may be different.

[0040] Support for N = M = 1 is being considered for Rel. 17. For example, it may be supported to indicate one common beam (e.g., a common beam) using RRC / MAC CE / DCI, and the common beam may be applied to multiple DL / UL channels / reference signals. Other cases may also be supported in Rel. 18 and later.

[0041] In a joint DL / UL TCI state, an RRC parameter (information element) configures multiple TCI states for both DL and UL. The MAC CE may activate multiple TCI states among the configured TCI states. The DCI may indicate one of the activated TCI states.

[0042] The DCI may be a UL DCI (e.g., a DCI used to schedule a PUSCH) or a DL DCI (e.g., a DCI used to schedule a PDSCH). The indicated TCI state may apply to at least one (or all) of the UL / DL channels / RS. One DCI may indicate both a UL TCI and a DL TCI.

[0043] The indicated single TCI state ID may be one TCI state that applies to both UL and DL, or may be two TCI states that apply to UL and DL, respectively.

[0044] 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).

[0045] 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 the multiple TCI states included in DCI, or may simply mean receiving "instruction information."

[0046] In a separate TCI state (e.g., separate TCI (DL TCI state and UL TCI state)), 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) among the configured multiple TCI states. Separate active TCI pools for each of the UL and DL may be configured / activated.

[0047] The DL DCI or a new DCI format may select (indicate) one or more (e.g., one) TCI states. The selected TCI state may apply to one or more (or all) DL channels / RSs. 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 a new DCI format may select (indicate) one or more (e.g., one) TCI states. The selected TCI state may apply to one or more (or all) UL channels / RSs. The UL channels may be PUSCH / SRS / PUCCH. In this way, different DCIs may indicate UL TCI and DL DCI separately.

[0048] It is assumed that in Rel. 17 NR and later, the MAC CE / DCI supports beam activation / indication to a TCI state associated with a different physical cell identifier (PCI), and in Rel. 18 NR and later, the MAC CE / DCI supports indicating a serving cell change to a cell with a different PCI.

[0049] The application of the joint TCI state and the separate (DL / UL) TCI state may be switched. Whether the joint TCI state or the separate TCI state is applied may be configured by a higher layer parameter from the base station to the UE, or may be switched by a TCI field (TCI state ID) in the DCI.

[0050] The unified TCI framework supports the following modes 1 to 3: [Mode 1] MAC CE based TCI state indication [Mode 2] DCI based TCI state indication by DCI format 1_1 / 1_2 with DL assignment [Mode 3] DCI based TCI state indication by DCI format 1_1 / 1_2 without DL assignment

[0051] The DCI in the above-mentioned mode 2 / mode 3 may be called a beam instruction DCI.

[0052] In the present disclosure, the terms "DCI-indicated TCI state," "indicated TCI state," "indicated TCI state," "unified TCI state," "TCI state applied to multiple types of channels / signals," "joint TCI state (for DL ​​and UL)," "DL TCI state," "UL TCI state," "Rel. 17 TCI state," "common TCI state," "single unified TCI state configured," and "single unified TCI state activated" may be read interchangeably.

[0053] In the present disclosure, the terms TCI state set by RRC parameters, configured TCI state, set TCI state, TCI state that does not conform to the unified TCI state, TCI state other than the unified TCI state, TCI state / spatial relationship set for a specific channel / signal, and individual TCI state may be read interchangeably.

[0054] The unified / common TCI state may refer to the indicated TCI state indicated using DCI / MAC CE / RRC (in Rel. 17).

[0055] The indicated TCI state may be shared with at least one of the UE-specific reception of PDSCH / PDCCH (updated using Rel. 17 DCI / MAC CE / RRC), PUSCH of dynamic grant (DCI) / configured grant, and multiple (e.g., all) dedicated PUCCH resources. The TCI state indicated by DCI / MAC CE / RRC may be referred to as the indicated TCI state.

[0056] If the indicated TCI state is supported (in Rel. 17), a TCI state other than the unified TCI state may refer to the TCI state configured using MAC CE / RRC (in Rel. 17) (configured TCI state).

[0057] The configured TCI state may not be shared with at least one of the UE-specific reception of PDSCH / PDCCH (updated using DCI / MAC CE / RRC in Rel. 17), PUSCH of dynamic grant (DCI) / configured grant, and multiple (e.g., all) dedicated PUCCH resources. The configured TCI state may be configured by RRC / MAC CE per CORESET / per resource / per resource set, and may not be updated even if the indicated TCI state is updated.

[0058] It is being considered that an indicated TCI state is applied to UE-specific channels / signals (RS), and that a UE is notified by higher layer signaling (RRC signaling) whether an indicated TCI state or a configured TCI state is applied to non-UE-specific channels / signals.

[0059] It is being considered that the RRC parameters for the configured TCI state (TCI state ID) will have the same configuration as the RRC parameters for the TCI state in Rel. 15 / 16. It is also being considered that the configured TCI state will be configured / instructed for each CORESET / resource / resource set using RRC / MAC CE. It is also being considered that the UE will determine the configuration / instruction based on specific parameters.

[0060] It is considered that the UE updates the indicated TCI state and the configured TCI state separately. For example, if the unified TCI state for the indicated TCI state is updated, the UE may not update the configured TCI state. It is also considered that the UE may determine whether to update the configured TCI state based on a specific parameter.

[0061] Furthermore, regarding the PDCCH / PDSCH, it is being considered to switch whether the indicated TCI state is applied or not applied (the configured TCI state is applied, or the TCI state configured separately from the indicated TCI state is applied) using higher layer signaling (RRC / MAC CE).

[0062] In addition, with regard to intra-cell beam indication (TCI state indication), it is being considered to support indication TCI state for UE-specific CORESET and PDSCH associated with that CORESET, and non-UE-specific CORESET and PDSCH associated with that CORESET.

[0063] In addition, for inter-cell beam indication (e.g., L1 / L2 inter-cell mobility), it is being considered that indication TCI status will be supported for a UE-specific CORESET and the PDSCH associated with that CORESET.

[0064] In Rel. 15, whether to indicate the TCI state for CORESET #0 was up to the implementation of the base station. In Rel. 15, for CORESET #0 for which a TCI state is indicated, the indicated TCI state is applied. For CORESET #0 for which a TCI state is not indicated, the SSB and QCL selected at the time of the latest (most recent) PRACH transmission are applied.

[0065] In the unified TCI state framework for Rel. 17 and later, the TCI state for CORESET #0 is being considered.

[0066] For example, in the unified TCI state framework of Rel. 17 and later, whether or not to apply the indicated Rel. 17 TCI state associated with the serving cell for the TCI state indication of CORESET #0 (of Rel. 17) is configured by RRC for each CORESET, and if not applied, the legacy MAC CE / RACH signaling mechanism may be used.

[0067] In addition, in Rel. 17, the CSI-RS related to the TCI state applied to CORESET #0 may be QCL'd with the SSB related to the serving cell PCI (physical cell ID) (similar to Rel. 15).

[0068] For CORESET #0, a CORESET with a common search space (CSS), and a CORESET with a CSS and a UE-specific search space (USS), whether to follow the indicated TCI state may be configured for each CORESET by an RRC parameter. If the indicated TCI state is not configured for that CORESET, the configured TCI state may be applied to that CORESET.

[0069] For non-UE-dedicated channels / RSs (except CORESET), whether to follow the indicated TCI state may be configured for each channel / resource / resource set by an RRC parameter. If the indicated TCI state is not configured for that channel / resource / resource set, the configured TCI state may be applied to that channel / resource / resource set.

[0070] Antenna Port QCL: Physical Layer Procedures for Data / Physical Downlink Shared Channel Association Procedures / UE Procedures for Receiving the Physical Uplink Shared Channel A UE can configure a list of up to M TCI-States in the higher layer parameter PDSCH-Config for decoding PDSCH according to the detected PDCCH with DCI for the UE and a given serving cell, where M depends on the UE capability maxNumberConfiguredTCIstatesPerCC. Each TCI-State includes parameters for configuring the QCL relationship between one or two downlink reference signals and the DM-RS port of the PDSCH, the DM-RS port of the PDCCH, or the CSI-RS port of the CSI-RS resource. The QCL relationship is configured by the higher layer parameter qcl-Type1 for the first DL RS and the higher layer parameter qcl-Type2 for the second DL RS (if configured). In the case of two DL RSs, the QCL type is not the same, regardless of whether the references are to the same DL RS or different DL RSs. The QCL type corresponding to each DL RS is given by the higher layer parameter qcl-Type in QCL-Info and may take one of the following values: ◇'typeA': {Doppler shift, Doppler spread, mean delay, delay spread} ◇'typeB': {Doppler shift, Doppler spread} ◇'typeC': {Doppler shift, mean delay} ◇'typeD': {Spatial Rx parameters}

[0071] In order to provide reference signals for PDSCH DMRS and PDCCH DMRS and CSI-RS within a CC, and further to provide a reference for determining the UL TX (transmission) spatial filter for dynamic grant and configuration grant-based PUSCH and PUCCH resources and SRS within a CC, if such a filter is available, the UE can configure a list of up to 128 DLorJointTCIState settings within PDSCH-Config.

[0072] If there is no TCI state (DL or joint TCI state (TCI-State) or UL TCI state (TCI-UL-State)) configured in the BWP in that CC, the UE may apply the TCI-State or TCI-UL-State configuration from the reference BWP of the reference CC. If the UE has dl-OrJointTCI-StateList or TCI-UL-State configured in any CC in the same band, it does not expect tci-StatesToAddModList (TCI state list for adding modifications), SpatialRelationInfo (spatial relation information), or PUCCH-SpatialRelationInfo (PUCCH spatial relation information) to be configured in that band, except for SpatialRelationInfoPos (spatial relation information for position). The UE can assume that if the UE has TCI-State configured in any CC in its CC list by simultaneousTCI-UpdateList1-r16 (simultaneous TCI update list 1), simultaneousTCI-UpdateList2-r16 (simultaneous TCI update list 2), simultaneousSpatial-UpdatedList1-r16 (simultaneous spatial update list 1), or simultaneousSpatial-UpdatedList2-r16 (simultaneous spatial update list 2), the UE does not have dl-OrJointTCI-StateList or TCI-UL-State configured in any CC in the same band in its CC list.

[0073] The UE receives an activation command used to map up to eight TCI states and / or up to eight TCI state pairs, with one TCI state for DL ​​channels / signals and / or one TCI state for UL channels / signals, to codepoints of the DCI field 'Transmission Configuration Indication' for one or a set of CCs / DL BWPs and, if applicable, one or a set of CCs / UL BWPs, as described in TCI States Activation / Deactivation for UE-specific PDSCH MAC CE or Unified TCI States Activation / Deactivation MAC CE in the MAC protocol specification.

[0074] For a set of CCs / DL BWPs and, if applicable, a set of CCs / UL BWPs, a set of TCI State IDs is activated, and if the applicable list of CCs is determined by the CCs indicated in the activation command, the same set of TCI State IDs applies to all DL and / or UL BWPs within the indicated CC.

[0075] If the activation command maps a TCI state (at least one of TCI-State and TCI-UL-State) to only one code point, and the indicated mapping for that single TCI code point is applied as described in the Requirements for Radio Resource Management (RRM) Support (MAC CE-based DL TCI State Switching Delay / MAC CE-based UL TCI State Switching Delay), the UE applies the indicated TCI state (at least one of TCI-State and TCI-UL-State) to one or a set of CCs / DL BWPs and, if applicable, to one or a set of CCs / UL BWPs.

[0076] If the bwp-id or cell for a QCL type A / D source RS in the QCL-Info of a TCI state is not configured, the UE shall assume that the QCL type A / D source RS is configured in the CC / DL BWP to which the TCI state applies.

[0077] If the TCI field is configured to be present in the DCI for CORESET (tci-PresentInDCI set to 'enabled' or tci-PresentDCI-1-2 set), a UE configured with a DL or joint TCI state list (dl-OrJointTCI-StateList) with an activated TCI state (TCI-State or TCI-UL-State) receives DCI format 1_1 / 1_2 that provides an indication of the TCI state (at least one of TCI-State and TCI-UL-State) for one CC or for all CCs in the same CC list configured by the simultaneous unified TCI update list (simultaneousU-TCI-UpdateList1-r17, simultaneousU-TCI-UpdateList2-r17, simultaneousU-TCI-UpdateList3-r17, simultaneousU-TCI-UpdateList4-r17). The DCI format 1_1 / 1_2 may be accompanied by a DL assignment if one is available, or may not be accompanied by a DL assignment.

[0078] If DCI format 1_1 / 1_2 does not carry a DL assignment, the UE can assume (verify): ◇The CS-RNTI is used to scramble the CRC for that DCI. ◇The values ​​of the following DCI fields (special fields) are set as follows: - The redundancy version (RV) field is all '1's. - The modulation and coding scheme (MCS) field is all '1's. - The new data indicator (NDI) field is 0. - The frequency domain resource assignment (FDRA) field is all '0's for FDRA type 0, or all '1's for FDRA type 1, or all '0's for Dynamic Switch (similar to PDCCH validation for release of DL semi-persistent scheduling (SPS) or UL grant type 2 scheduling).

[0079] If a UE receives a higher layer configuration of dl-OrJointTCI-StateList with a single TCI-State that can be used as the indication TCI state, the UE derives QCL assumptions from the configured TCI states for the PDSCH DM-RS, PDCCH DM-RS, and CSI-RS that apply to that indication TCI state.

[0080] If the UE receives higher layer configuration of dl-OrJointTCI-StateList with a single TCI-State or a single TCI-UL-State that can be used as the indicated TCI state, the UE determines the UL TX spatial filter, if applicable, from the configured TCI state for dynamic and configured grant-based PUSCH, PUCCH and SRS that apply to the indicated TCI state.

[0081] When a UE configured with a list of DL or joint TCI states (dl-OrJointTCI-StateList) attempts to transmit a PUCCH with a positive HARQ-ACK or a PUSCH with a positive HARQ-ACK corresponding to a DCI that transmits a TCI state indication and does not have a DL assignment, or corresponding to a PDSCH scheduled by a DCI that transmits a TCI state indication, and the indicated TCI state is different from a previously indicated indicated TCI state, the indicated TCI state (at least one of the indicated TCI-State and the indicated TCI-UL-State) will start to be applied from the first slot (beam application timing 1) that is at least beamAppTime symbols (beam application time (BAT)) after the last symbol of that PUCCH or that PUSCH. Both the first slot and the beamAppTime symbols are determined on the active BWP with the smallest SCS among the BWPs from the CC that applies the indicated TCI state (at least one of the indicated TCI-State and the indicated TCI-UL-State) that is active at the end of the PUCCH or the PUSCH that transmits the positive HARQ-ACK.

[0082] [DCI Format 1_1: Multiplexing and Channel Coding / Downlink Transport Channel and Control Information / Downlink Control Information / DCI Format] In Rel. 15 / 16, if a UE does not support active BWP changes via DCI, the UE ignores the BWP indicator field. A similar behavior is also considered for the relationship between support for the Rel. 17 TCI state and the interpretation of the TCI field. It is considered that if a UE is configured with the Rel. 17 TCI state, the TCI field will always be present in DCI format 1_1 / 1_2, and if the UE does not support TCI updates via DCI, the UE will ignore the TCI field.

[0083] In Rel. 15 / 16, whether or not a TCI field is present (TCI presence information in DCI, tci-PresentInDCI) is set for each CORESET.

[0084] The TCI field in DCI format 1_1 is 0-bit if the higher layer parameter tci-PresentInDCI is not enabled, and 3-bit otherwise. If the BWP indicator field indicates a BWP other than the active BWP, the UE shall follow the following behavior: [Action] If the higher layer parameter tci-PresentInDCI is not enabled for the CORESET used for the PDCCH carrying that DCI format 1_1, the UE shall assume that tci-PresentInDCI is not enabled for all CORESETs in the indicated BWP; otherwise, the UE shall assume that tci-PresentInDCI is enabled for all CORESETs in the indicated BWP.

[0085] The TCI field in DCI format 1_2 is 0 bit if the higher layer parameter tci-PresentInDCI-1-2 is not set, otherwise it is 1, 2 or 3 bits determined by the higher layer parameter tci-PresentInDCI-1-2. If the BWP indicator field indicates a BWP other than the active BWP, the UE shall follow the following actions. [Operation] If the higher layer parameter tci-PresentInDCI-1-2 is not set for the CORESET used for the PDCCH carrying that DCI format 1_2, the UE shall assume that tci-PresentInDCI is not enabled for all CORESETs in the indicated BWP; otherwise, the UE shall assume that tci-PresentInDCI-1-2 for all CORESETs in the indicated BWP is set with the same value as tci-PresentInDCI-1-2 set for the CORESET used for the PDCCH carrying that DCI format 1_2.

[0086] A TCI status ID indicating the joint DL / UL TCI status is associated with the value of the TCI field for indicating the joint DL / UL TCI status.

[0087] At least one TCI state ID, a TCI state ID indicating a TCI state for only DL and a TCI state ID indicating a TCI state for only UL, is associated with a value of the TCI field for separate DL / UL TCI state indication. For example, the TCI field values ​​000 to 001 are associated with only one TCI state ID for DL, the TCI field values ​​010 to 011 are associated with only one TCI state ID for UL, and the TCI field values ​​100 to 111 are associated with both one TCI state ID for DL ​​and one TCI state ID for UL.

[0088] [Channels / RSs to which the indicated TCI state applies] The indicated TCI state by the MAC CE / DCI may apply to the following channels / RSs:

[0089] [PDCCH] - If followUnifiedTCIState is configured for CORESET0, the indicated TCI state applies. Otherwise, the Rel. 15 specifications apply for that CORESET. That is, CORESET0 follows the TCI state activated by the MAC CE or is QCL'd with SSB. - For CORESETs with USS / CSS type 3 and index other than 0, the indicated TCI state always applies. - For CORESETs with index other than 0 and at least CSS type other than 3, if followUnifiedTCIState is configured, the indicated TCI state applies. Otherwise, the configured TCI state for that CORESET applies to that CORESET.

[0090] [PDSCH] - The indicated TCI state always applies to all UE-dedicated PDSCHs. - For non-UE-dedicated PDSCHs (PDSCHs scheduled by DCI in CSS), the indicated TCI state may apply if followUnifiedTCIState is set (for the CORESET of the PDCCH that schedules that PDSCH). Otherwise, the configured TCI state for that PDSCH applies to that PDSCH. If followUnifiedTCIState is not set for a PDSCH, whether a non-UE-dedicated PDSCH follows the indicated TCI state may depend on whether followUnifiedTCIState is set for the CORESET used to schedule that PDSCH.

[0091] [CSI-RS] For an A-CSI-RS for CSI acquisition or beam management, if followUnifiedTCIState is set (for CORESET of the PDCCH that triggers that A-CSI-RS), the indicated TCI state applies. For other CSI-RSs, the configured TCI state for that CSI-RS applies.

[0092] [PUCCH] - For all dedicated PUCCH resources, the indicated TCI state always applies.

[0093] [PUSCH] - For dynamic / configured grant PUSCH, the indication TCI state always applies.

[0094] [SRS] - When the SRS resource set for the A-SRS used for beam management and the A / SP / P-SRS used for codebook (CB) / non-codebook (NCB) / antenna switching is configured to follow the unified TCI state, the indicated TCI state is applied. For other SRSs, the configured TCI state in the SRS resource set is applied.

[0095] In the present disclosure, the terms "indicated TCI state," "unified TCI state," "TCI state applied to channels / signals configured to follow the unified TCI state," "TCI state applied to a UE-specific PDSCH and a CORESET / PDCCH associated with a USS," and "TCI state applied to a PUCCH and a PUSCH" may be interchangeable.

[0096] (Multi-TRP) In NR, one or more transmission / reception points (Transmission / Reception Points (TRP)) (multi-TRP) are considered to perform DL transmission to a UE using one or more panels (multi-panels). Also, it is considered that a UE performs UL transmission to one or more TRPs.

[0097] Note that multiple TRPs may correspond to the same cell identifier (ID), different cell IDs, different TCI state positions / orders, different CORESET pools, or different SRS resource sets. The cell ID may be a physical cell ID (e.g., PCI) or a virtual cell ID.

[0098] In the case where only one TRP (TRP1) of the multi-TRPs transmits to the UE (which may also be called single mode, single TRP, etc.), TRP1 transmits both control signals (PDCCH) and data signals (PDSCH) to the UE.

[0099] In this disclosure, single-TRP mode may refer to a mode in which multi-TRP (mode) is not set.

[0100] In a case where only one TRP of a multi-TRP transmits a control signal to a UE and the multi-TRP transmits a data signal (which may be called a single master mode), the UE receives each PDSCH transmitted from the multi-TRP based on one piece of Downlink Control Information (DCI).

[0101] In a case where each of the multi-TRPs transmits a separate control signal to the UE and the multi-TRPs transmit data signals (which may be called a multi-master mode), a first control signal (DCI) may be transmitted on TRP1 and a second control signal (DCI) may be transmitted on TRP2. The UE receives each PDSCH transmitted from the multi-TRP based on these DCIs.

[0102] When multiple PDSCHs from multiple TRPs (which may be referred to as multiple PDSCHs) are scheduled using one DCI, the DCI may be referred to as a single DCI (S-DCI, single PDCCH). Also, when multiple PDSCHs from multiple TRPs are scheduled using multiple DCIs, these multiple DCIs may be referred to as multiple DCIs (M-DCI, multiple PDCCHs).

[0103] Each TRP in a multi-TRP may transmit a different transport block (TB) / code word (CW) / different layer, or each TRP in a multi-TRP may transmit the same TB / CW / layer.

[0104] Non-Coherent Joint Transmission (NCJT) is being considered as one form of multi-TRP transmission. In NCJT, for example, TRP1 modulates and layer-maps a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding. TRP2 modulates and layer-maps a second codeword to transmit a second PDSCH using a second number of layers (e.g., two layers) with a second precoding.

[0105] Note that multiple PDSCHs (multi-PDSCHs) that are non-coherent may be defined as partially or completely overlapping in time and / or frequency domains, i.e., a first PDSCH from a first TRP and a second PDSCH from a second TRP may overlap in time and / or frequency resources.

[0106] 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).

[0107] In URLLC for multi-TRP, it is considered that PDSCH (transport block (TB) or codeword (CW)) repetition across multi-TRP is supported. Repetition schemes (URLLC schemes, e.g., Schemes 1, 2a, 2b, 3, and 4) across multi-TRP in the frequency domain, layer (spatial) domain, or time domain are supported. In Scheme 1, multiple PDSCHs from multi-TRP are space division multiplexed (SDM). In Schemes 2a and 2b, PDSCHs from multi-TRP are frequency division multiplexed (FDM). In Scheme 2a, the redundancy version (RV) is the same for multi-TRP. In Scheme 2b, the RVs for multi-TRP may be the same or different. 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.

[0108] Such a multi-TRP scenario allows for more flexible transmission control using good quality channels.

[0109] NCJT using multiple TRPs / panels may use a high rank. To support ideal and non-ideal backhaul between multiple TRPs, both single DCI (single PDCCH) and multiple DCI (multiple PDCCH) may be supported. For both single DCI and multi-DCI, the maximum number of TRPs may be two.

[0110] For single PDCCH design (mainly for ideal backhaul), TCI extension is being considered. Each TCI codepoint in the DCI may correspond to one or two TCI states. The TCI field size may be the same as that of Rel. 15.

[0111] For PDCCH / CORESET specified in Rel. 15, one TCI state without CORESETPoolIndex (also referred to as TRP Info) is set to one CORESET.

[0112] Regarding the PDCCH / CORESET enhancements specified in Rel. 16, in multi-TRP based on multi-DCI, a CORESET pool index is configured for each CORESET.

[0113] (JT) Joint transmission (JT) may refer to simultaneous data transmission from multiple points (eg, TRPs) to a single UE.

[0114] Rel. 17 supports non-coherent joint transmission (NCJT) from two TRPs. The PDSCHs from the two TRPs may be independently precoded and independently decoded. The frequency resources may be non-overlapping, partially overlapping, or fully overlapping. When overlap occurs, the PDSCH from one TRP will interfere with the PDSCH from the other TRP.

[0115] Rel. 18 is considering supporting coherent joint transmission (CJT, mTRP CJT) using up to four TRPs. Data from the four TRPs may be coherently precoded and transmitted to the UE on the same time-frequency resource. For example, the same precoding matrix may be used to consider channels from the four TRPs. "Coherent" may mean that there is a fixed relationship between the phases of multiple received signals. Using four-TRP joint precoding, signal quality may be improved and there may be no interference between the four TRPs. Data may only be subject to interference outside the four TRPs.

[0116] (TCI indication in Rel. 18 NR) The TCI state configuration by RRC follows the following: Up to 128 TCI states can be configured for one serving cell. In coordination between multiple TRPs with different PCIs, multiple TCI states can be associated with SSBs of different PCIs, and up to 8 PCIs can be configured.

[0117] Activation of TCI states by the MAC CE follows: ◇ In single-TRP transmission, up to eight TCI states can be activated for one serving cell or one BWP of one serving cell. ◇ In switching between multiple TRPs with different PCIs, multiple activated TCI states can be associated with SSBs of different PCIs, and TCI states of up to eight PCIs can be activated. ◇ In multi-TRP joint transmission, up to eight TCI states can be activated per TRP / cell, and up to 16 TCI states can be activated in total. ◇ In joint transmission using multiple TRPs with different PCIs, multiple activated TCI states can be associated with SSBs of different PCIs, and TCI states of up to two PCIs can be activated.

[0118] The indication of the TCI state by the DCI is as follows: ◇Multiple code points in the TCI indication field in the DCI are mapped to multiple TCI states activated via the MAC CE. ◇In a single-TRP transmission, one code point in the TCI indication field in the DCI is mapped to one joint DL and UL TCI, or one DL TCI and one UL TCI, or one DL TCI, or one UL TCI. ◇In a single-DCI-based multi-TRP joint transmission, one code point in the TCI indication field in the DCI is mapped to one or two joint DL and UL TCIs, or one or two DL TCIs and one or two UL TCIs, or one or two DL TCIs, or one or two UL TCIs. In multi-DCI-based multi-TRP joint transmission, one code point of the TCI indication field in the DCI is mapped to one or two DL and UL joint TCIs, or one or two DL TCIs and one or two UL TCIs, or one or two DL TCIs, or one or two UL TCIs. Multiple DCIs indicate the TCI status for multiple TRPs.

[0119] (Cell-free) Existing wireless communication systems (e.g., 5G NR) have adopted a cellular system in which one cell is formed by one antenna / TRP. The area formed by the cell is fixed / static.

[0120] In addition, existing wireless communication systems (e.g., Rel. 16 and later) have introduced distributed multi-input multi-output (Distributed MIMO, e.g., multi-TRP using multiple transmission / reception points (TRPs)), which form a communication area using the coverage of multiple antennas / TRPs. Distributed MIMO allows simultaneous communication using multiple antennas / TRPs and communication using one antenna / TRP.

[0121] By adopting distributed MIMO, it is possible to create a more favorable line-of-sight environment and improve MIMO performance.

[0122] 1A and 1B are diagrams illustrating an overview of MIMO. Fig. 1A illustrates an example of co-located MIMO. In co-located MIMO, one UE communicates with one antenna / TRP.

[0123] On the other hand, Figure 1B illustrates an example of distributed MIMO, in which one UE communicates with multiple antennas / TRPs in cooperation with each other.

[0124] In future wireless communication systems (e.g., Rel. 20 and later), the introduction of cell-free communication is being considered with the aim of further improving performance and energy efficiency through reducing interference between multiple antennas / TRPs, creating a line-of-sight environment for high-frequency use, improving frequency utilization efficiency throughout the system, and applying equal, high-quality communication to each user.

[0125] Self-Free may also be referred to as cell-free massive MIMO (mMIMO) or large-scale distributed MIMO (D-MIMO). Self-Free uses coherent cooperation of multiple access points. Self-Free may include at least one of ultra-dense deployment, scalable cooperation, user-centric clustering, super-carrier aggregation, and analog fronthaul. The user plane for cell-free may perform more flexible scheduling than existing scheduling. The control plane for cell-free may maintain some form of cell to facilitate signaling.

[0126] In cell-free, unlike conventional cellular systems, one area (which may be called a cell / sub-cell, etc.) may be formed by multiple antennas / TRPs. In other words, the area may mean a cell that does not depend on the position of the antenna.

[0127] In cell-free, the set of antennas / TRPs used to form a coverage area may be changed according to the needs of UEs. For example, the set of antennas / TRPs may be changed based on the number of UEs, the number of traffic, communication purposes (e.g., initial access, data communication, measurement, reporting, etc.), etc., rather than the coverage of the antennas / TRPs.

[0128] In other words, in cell-free, the coverage between multiple antennas / TRPs may overlap.

[0129] In cell-free mode, the direction in which a synchronization signal (which may also be called, for example, a synchronization signal block (SSB), a synchronization signal / physical broadcast channel (SS / PBCH) block, etc.) is transmitted may be controlled for each antenna / TRP.

[0130] In addition, in cell-free, a central unit (CU) / distributed unit (DU) may be virtualized for each antenna / TRP, or each antenna / TRP may be managed by only the CU.

[0131] Fig. 2A is a diagram showing an overview of a cellular system, in which cells formed by each antenna / TRP are shown, and UEs communicate based on these cells.

[0132] On the other hand, Figure 2B is a diagram showing an overview of a cell-free system. In the example shown in Figure 2B, the installed antennas / TRPs do not form fixed / static cells in a cellular system. As shown in Figure 2B, in a cell-free system, one or more antennas / TRPs form areas according to conditions. Therefore, in a cell-free system, each antenna / TRP does not need to correspond to the same physical cell ID, and the areas between multiple antennas / TRPs may overlap.

[0133] Self-regulation may be achieved, for example, by coordinating a set of antennas / TRPs controlled by a central control unit (e.g., CU).

[0134] In a cell-free system, a first cell (e.g., may be referred to as a cell / super cell / macro cell / large cell, etc.) with a fixed physical range like a cell in a 5G NR system, and a second cell (e.g., may be referred to as a subcell / area / micro cell / cell / small cell / second cell within the first cell, etc.) with a quasi-static / dynamic physical range that varies based on conditions may be formed. For example, the first cell may be referred to as a supercell to distinguish it from the second cell. When a supercell is composed of multiple second cells, the second cells may have the same definition / operation / coverage as existing cells in NR. For example, the second cells may be referred to as subcells to distinguish them from the first cell. When a supercell or a cell is composed of multiple subcells, the subcells may have the same definition / operation / coverage as existing cells in NR.

[0135] The first cell may be a cell that is newly defined in a future wireless communication system, or may be a cell defined in an existing wireless communication system that is reused.

[0136] The configurations of the first cell and the second cell can be considered as follows: Assumption 1 and Assumption 2: The first cell is composed of multiple TRPs with one cell ID (physical cell ID (PCI)). The multiple TRPs can transmit and receive in coordination. Assumption 2: The first cell is composed of multiple TRPs (or sub-cells) with different cell IDs. The multiple TRPs / sub-cells can transmit and receive in coordination.

[0137] 3A is a diagram showing an example of the outline of the cell-free configuration assumption 1. In the example shown in FIG. 3A, each TRP included in the first cell (super cell / cell) has the same PCI (PCI #0). Multiple TRPs can communicate with one UE in a coordinated manner.

[0138] Figure 3B is a diagram showing an example of the outline of the cell-free configuration assumption 2. In the example shown in Figure 3B, each TRP included in the first cell (super cell / cell) has a different PCI (PCI #0 to #9). Multiple TRPs can communicate cooperatively with one UE.

[0139] Figure 3C is a diagram showing another example of the outline of Assumption 2 of the cell-free configuration. In the example shown in Figure 3A, a PCI is assigned to each TRP included in the first cell (supercell / cell). In the example shown in Figure 3C, unlike the example in Figure 3B, the same PCI may correspond to multiple TRPs. Multiple TRPs can communicate cooperatively with one UE. Multiple TRPs associated with the same PCI may be included in one cell.

[0140] Transmission / reception with TRP / subcell coordination may be based on at least one of the following schemes supported in NR: ◇ Transmission of a single TRP / subcell with dynamic TRP / subcell switching (single-TRP transmission). ◇ Joint transmission using multiple TRPs / subcells (multi-TRP joint transmission). The joint transmission may be based on a single DCI or multiple DCIs. The joint transmission may be non-coherent joint transmission (NCJT) or coherent joint transmission (CJT).

[0141] For cell-free, assuming ideal backhaul and tight coordination, in the joint transmission scheme, CJT may be prioritized over NCJT, and single DCI-based joint transmission may be prioritized over multi-DCI-based joint transmission.

[0142] (Issues) The following aspects can be considered in the extension of cell-free beam direction (TCI direction): ◇Aspect 1: A larger number of TRPs / subcells in a supercell / cell compared to NR. ◇Aspect 2: Dynamic clustering of TRPs / subcells for joint transmission / reception. ◇Aspect 3: Coordinated transmission / reception using a larger number of TRPs / subcells compared to NR.

[0143] With a large number of TRPs / sub-cells within a super-cell / cell, the 128 TCI states configured by the RRC are not considered sufficient.

[0144] In a single TRP / subcell transmission with dynamic TRP / subcell switching, the eight TCI states activated by the MAC CE are not considered sufficient to support multiple coordinated TRPs / subcells (dynamic switching between multiple TRPs / subcells).

[0145] In joint transmission of multiple TRPs / sub-cells, the 16 TCI states activated by the MAC CE are considered insufficient to support dynamic TRP / sub-cell clustering (dynamic selection of multiple TRPs / sub-cells for joint transmission).

[0146] In joint transmission of multiple TRPs / subcells, it is considered that the 16 TCI states activated by the MAC CE are not sufficient to support a large number of TRPs / subcells for joint transmission, and the codepoints of the TCI field in the DCI that are mapped to two TCI states are not sufficient.

[0147] As such, beam direction when using units different from existing cells has not been sufficiently considered. If beam direction is not sufficiently considered, there is a risk of communication quality / throughput being reduced.

[0148] Therefore, the present inventors came up with the idea of ​​a beam direction method in which a unit different from the existing cell is used.

[0149] (Various Reinterpretations, etc.) Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Note that each of the following embodiments (e.g., each case) may be used alone, or at least two of them may be combined and applied.

[0150] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0151] In the present disclosure, terms such as activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0152] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0153] 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, the terms RRC signaling, RRC IE, RRC parameter, and higher layer parameter may be interchangeable.

[0154] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. 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.

[0155] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0156] In this disclosure, "having the capability of..." may be read interchangeably as "supporting / reporting the capability of...".

[0157] In the present disclosure, ceil(x), ceiling function, and ceiling function may be interchangeable. In the present disclosure, floor(x), floor function, and floor function may be interchangeable. In the present disclosure, sqrt(x) and square root may be interchangeable. In the present disclosure, x mod y, mod(x,y), mod function, and modulo operation may be interchangeable. In the present disclosure, Σ i=M M+N-1 f(i),Σ i=M M+N-1 f i , f(i) or f for i=M, M+1,..., M+N-1 i summation, f(M)+f(M+1)+...+f(M+N-1), f M +f M+1 +...+f M+N-1, may be read interchangeably. C(n,k) is the number of combinations of selecting k values ​​from n values ​​(combinatorial coefficient), binomial coefficients, n C k , C n k , may be read interchangeably.

[0158] In this disclosure, a b , a_b, and a with b added to the bottom right of a may be read interchangeably. c , a^c, and the notation of a with c added to the upper right of a may be read interchangeably. b c , a_b^c, and the notation in which b is added to the bottom right of a and c is added to the top right may be read interchangeably. ~ may be expressed by adding 〜 to the x, or may be referred to as x tilde. - may be represented by an x ​​with a - or may be called an x-bar.

[0159] In the present disclosure, the frequency range corresponding to FR1 may be 410-7125 MHz. In the present disclosure, FR2 may include FR2-1 and FR2-2, and the frequency range corresponding to FR2-1 may be 24250-52600 MHz, and the frequency range corresponding to FR2-1 may be 52600-71000 MHz.

[0160] In the present disclosure, the terms TCI state, DL and UL joint TCI state (joint DL / UL TCI state, a TCI state applied to both DL channels / signals and UL channels / signals), DL TCI state (separate DL TCI state, a TCI state applied only to DL channels / signals), and UL TCI state (separate UL TCI state, a TCI state applied only to UL channels / signals) may be read interchangeably.

[0161] In the present disclosure, the joint transmission of multiple TRPs / cells based on a single DCI (single DCI-based joint transmission, single DCI-based multi-TRP transmission) may be at least one of the following schemes: ◇Space division multiplex (SDM) scheme. This scheme may involve different ports / layers of DMRS for DL / UL transmission being associated with different TCI states, respectively. ◇Frequency division multiplex (FDM) scheme. This scheme may involve different frequency domain resources for DL / UL transmission being associated with different TCI states, respectively. ◇Coherent joint transmission (CJT) scheme. This scheme may involve different ports / layers of DMRS for DL / UL transmission being associated with different TCI states, respectively. ◇Single frequency network (SFN) scheme. This scheme may involve different ports / layers of DMRS for DL / UL transmission being associated with different TCI states, respectively. ◇Time division multiplex (TDM) scheme. This scheme may be that different time domain resources of DL / UL transmission are associated with different TCI states, respectively.

[0162] In the present disclosure, the multi-DCI based joint transmission of multiple TRPs / cells (multi-DCI based joint transmission, multi-DCI based multi-TRP transmission) scheme may be such that multiple DL / UL channels / signals are associated with different TCI states transmitted on multiple resources in overlapping time / frequency domains.

[0163] In the present disclosure, the terms TCI state, beam, spatial relationship, spatial domain Tx / Rx parameters, QCL, and reference signal may be interpreted interchangeably.

[0164] In the present disclosure, TRP, group of beams, group of TCI states, and set / group of RS resources may be read interchangeably.

[0165] In the present disclosure, the DCI indicating the TCI state may schedule the PDSCH / PUSCH.

[0166] In the present disclosure, coordinated transmission may be DL transmission or UL transmission using a designated TCI state among multiple activated TCIs. In the present disclosure, joint transmission may be DL transmission or UL transmission using multiple designated TCI states / TRPs / subcells. In the present disclosure, single TRP transmission / coordinated transmission / joint transmission may be applied to DL / UL.

[0167] The following embodiments may be applied to other scenarios that use multiple TRPs that are greater than the multiple TRPs in existing specifications.

[0168] (Wireless Communication Method) <First Embodiment> This embodiment relates to RRC configuration (RRC IE, list) of TCI state.

[0169] For one supercell / cell, N Tci Up to N TCI states may be configured by the RRC. Tci may be the maximum number of TCI states in the RRC configuration.

[0170] N Tci may be greater than 128. Tci may follow at least one of the following formulas: Tci =M Tci-perTrp *N Trp ◇N Tci =M Tci-perCell *N Cell

[0171] N Tci , N Trp , N Cell , M Tci-perCell , M Tci-perTrp At least one of may be defined in the specification, provided by the RRC, or reported as a UE capability.

[0172] N Trp N may refer to the number of TRPs with the same PCI or different PCIs within a supercell / cell. Cell M may refer to the number of sub-cells with different PCIs within a super-cell / cell. Tci-perTrp M may refer to the number (maximum) of TCI states per TRP of a supercell / cell. Tci-perCell may refer to the number (maximum number) of TCI states per sub-cell of a super-cell / cell.

[0173] <<Application to Assumption 2>> At least one of the following features may be applied to the above-mentioned Assumption 2. ◇Multiple TCI states configured in the RRC configuration may be associated with SSB / CSI-RS of different PCIs. ◇N Cell Up to 100 different PCIs may be provided. Compared to the existing NR, Cell may be greater than 8. ◇If N PCIs are provided, the N PCIs may include one serving cell PCI and N-1 additional PCIs that are different from the serving cell PCI.

[0174] RRC Signaling Structure The RRC signaling structure may follow at least one of several options below.

[0175] ◇Option 1: One list of N TCI states is provided for one supercell / cell. All TCI states in the single list may correspond to different TRPs / subcells and may be indexed from 0 to N-1. In the example of Figure 4, one TCI state list is configured for one supercell / cell. The TCI state list includes N TCI states. The N TCI states have indices (TCI state IDs) 0 to N-1, respectively.

[0176] ◇Option 2: One list of multiple TCI states is provided for each TRP of one supercell / cell. This option may follow at least one of several options 2-x below.

[0177] - ◇Option 2-1: All TCI states across all lists for all TRPs / subcells of a supercell / cell may be indexed from 0 to N-1 (N TCI states). In the example of Figure 5, for one supercell / cell, X TCI state lists #0, #1, ..., #X-1 are configured, each corresponding to X TRPs / subcells #0, #1, ..., #X-1 (TRP / subcell IDs = 0, 1, ..., X-1). TCI state list #i is M i The total number N of TCI states across TCI state lists #0, #1, ..., #X-1 (TCI state list ID = 0, 1, ..., X-1) is Σ i=0 X-1 M i M in TCI state list #i i For each TCI state, an index (TCI state ID) Σ k=0 i-1 M k , (Σ k=0 i-1 M k )+1, …, (Σ k=0 i-1 M k )+M i The N TCI states in the X TCI state lists are indexed with indices 0, 1, ..., N-1, respectively.

[0178] - ◇Option 2-2: All TCI states in one list for one TRP / subcell of a supercell / cell may be indexed from 0 to M-1 (M TCI states). In the example of Figure 6, for one supercell / cell, X TCI state lists #0, #1, ..., #X-1 (TCI state list ID = 0, 1, ..., X-1) are configured, each corresponding to X TRP / subcells #0, #1, ..., #X-1 (TRP / subcell ID = 0, 1, ..., X-1). TCI state list #i is M i Contains M TCI states in TCI state list #i. i For each TCI state, index (TCI state ID) 0, 1, ..., M i Each is indexed with -1.

[0179] <<Other Application Examples>> In this embodiment, when the total number of TCI states set for one supercell / cell is 128 or less (the same as the maximum number in the existing NR), the maximum number N of the total number of TCI states set for one supercell / cell is 128 or less. Tci This can also be applied to cases where .times. ...

[0180] <<Relationship Between TRP / Subcell and TCI State>> The TCI states of the same TRP / subcell may have something in common.

[0181] UL transmissions may follow at least one of several associations 1-x below: Association 1-1: UL transmissions using the same TRP / subcell TCI state may be associated with the same timing advance (TA, timing advance group, TAG). UL transmissions using different TRP / subcell TCI states may be associated with different TAs (TAGs). Association 1-2: UL transmissions using the same TRP / subcell TCI state may be associated with the same power control parameter set. UL transmissions using different TRP / subcell TCI states may be associated with different power control parameter sets. A power control parameter set may include at least one of P0, alpha, and path loss. Association 1-3: UL transmissions using the same TRP / subcell TCI state may be associated with the same SRS resource set for codebook / non-codebook. UL transmissions using different TRP / subcell TCI states may be associated with different SRS resource sets for codebook / non-codebook. ◇Association 1-4: UL transmissions using the same TRP / subcell TCI state may be associated with the same scrambling ID. UL transmissions using different TRP / subcell TCI states may be associated with different scrambling IDs.

[0182] DL transmissions may follow at least one of the following associations 2-x: Association 2-1: DL transmissions using the same TRP / TCI state of a subcell may be associated with the same power control parameter set. DL transmissions using different TRP / TCI states of a subcell may be associated with different power control parameter sets. A power control parameter set may include at least one of the following: SSB transmit power, CSI-RS transmit power offset for SSB, and CSI-RS transmit power. Association 2-2: DL transmissions using the same TRP / TCI state of a subcell may be quasi-colocated with respect to several properties or may be QCL-aligned with respect to several QCL types. The several properties may include at least one of Doppler shift, mean delay, Doppler spread, and delay spread. The QCL types may include at least one of 'typeA', 'typeB', 'typeC', and 'typeD'. ◇ Association 2-3: DL transmissions using the same TRP / TCI state of a subcell may be associated with the same scrambling ID. DL transmissions using different TRP / TCI states of a subcell may be associated with different scrambling IDs.

[0183] According to this embodiment, the UE can be configured / indicated the TCI state appropriately even if the cell and TRP association is changed.

[0184] <Embodiment 2> This embodiment relates to DL / UL transmission of a single TRP / subcell (single TRP transmission).

[0185] <<Number of active TCI states>> X for one supercell / cell or for one BWP of one supercell / cell Tci Up to X TCI states may be activated by a MAC CE command (Activation MAC CE, Activation Command). Tci may be the maximum number of TCI states in a MAC CE command.

[0186] X Tci may be greater than 8. Tci may follow at least one of the following formulas: Tci = Y Tci-perTrp *N Trp ◇X Tci = Y Tci-perCell *N Cell

[0187] X Tci , N Trp , N Cell , Y Tci-perCell , Y Tci-perTrp At least one of may be defined in the specification, provided by the RRC, or reported as a UE capability.

[0188] N Trp N may refer to the number of TRPs with the same PCI or different PCIs in a supercell / cell for cooperative transmission. The cooperative transmission may also be dynamic switching between the TRPs. Cell Y may refer to the number of sub-cells with different PCIs in a super-cell / cell for coordinated transmission. The coordinated transmission may be dynamic switching between the TRPs. Tci-perTrp Y may refer to the number (maximum) of TCI states per TRP of a supercell / cell. Tci-perCell may refer to the number (maximum number) of TCI states per sub-cell of a super-cell / cell.

[0189] <<Application to Assumption 2>> At least one of the following features may be applied to the above-mentioned Assumption 2: Multiple TCI states activated by a MAC CE may be associated with SSB / CSI-RS of different PCIs. Cell Multiple TCI states of up to different PCIs may be activated. Compared to existing NR, Cellmay be greater than 8. ◇If multiple TCI states of N PCIs are activated, the N PCIs may include one serving cell PCI and N-1 additional PCIs different from the serving cell PCI, or may be N additional PCIs different from the serving cell PCI.

[0190] <<Other Application Examples>> This embodiment is applicable to a case where the total number of TCI states activated for one supercell / cell is 8 or less (the same as the maximum number in the existing NR) (the maximum number of TCI states activated for one supercell / cell X Tci is less than or equal to 8).

[0191] Activation of TCI States The MAC CE signaling structure, the mapping between the TCI states activated by the MAC CE and the codepoints of the TCI fields in the DCI, may follow at least one of several options:

[0192] Option 1: One MAC CE command activates multiple TCI states across all TRPs / subcells of one supercell / cell. Multiple codepoints of the TCI field in the DCI may be mapped to the multiple TCI states activated across all TRPs / subcells of one supercell / cell, respectively. Increasing the number of activated TCI states may cause signaling overhead. This option may have at least one of the following features:

[0193] In the example of Figure 7, one MAC CE activates multiple TCI states across all TRPs / subcells of one supercell / cell. The activated multiple TCI states (TCI state IDs) 0, 2, 8, ... are mapped to multiple codepoints 0, 1, 2, ... of the TCI field in the DCI, respectively.

[0194] Option 2: One MAC CE command activates multiple TCI states for one TRP / subcell of one supercell / cell. Multiple codepoints of the TCI field in the DCI may be mapped to the multiple TCI states activated for one TRP / subcell of one supercell / cell, respectively. This option may have at least one of the following features:

[0195] The MAC CE may include an index corresponding to the TRP / subcell.

[0196] - The DCI may indicate an index corresponding to the TRP / subcell. This option may be represented by the following example:

[0197] In the example of Figure 8, a first MAC CE activates multiple TCI states for TRP / subcell #0 of one supercell / cell. The multiple TCI states (TCI state IDs) 1, 5, ..., 102 are mapped to multiple codepoints 0, 1, ... of the TCI field in the DCI for TRP / subcell #0, respectively. A second MAC CE activates multiple TCI states for TRP / subcell #1 of that supercell / cell. The multiple TCI states 134, 136, ..., 231 are mapped to multiple codepoints 0, 1, ... of the TCI field in the DCI for TRP / subcell #1, respectively. A third MAC CE activates multiple TCI states for TRP / subcell #2 of that supercell / cell. The multiple TCI states 267, 277, ..., 387 are mapped to multiple code points 0, 1, ..., respectively, of the TCI field in the DCI for TRP / subcell #2.

[0198] Option 3: One MAC CE command activates multiple TCI states for all TRPs / subcells of one supercell / cell. Multiple codepoints of the TCI field in the DCI may be mapped to the multiple TCI states activated for one TRP / subcell of one supercell / cell, respectively. This option may have at least one of the following features:

[0199] The first Y0 TCI states (first TCI state group #0) of the plurality of activated TCI states may correspond to the first TRP / subcell #0 of all TRPs / subcells of a supercell / cell. The next Y1 TCI states (second TCI state group #1) of the plurality of activated TCI states may correspond to the second TRP / subcell #1 of all TRPs / subcells of the supercell / cell.

[0200] - The DCI may indicate an index corresponding to the TRP / subcell. This option may be represented by the following example:

[0201] 9, one MAC CE activates multiple TCI states across all TRPs / subcells of one supercell / cell. The first Y0 TCI states (TCI state IDs) 1, 5, ..., 102 of the activated TCI states are mapped to codepoints 0, 1, ..., respectively, of the TCI field in the DCI for TRP / subcell #0. The next Y1 TCI states 134, 136, ..., 231 of the activated TCI states are mapped to codepoints 0, 1, ..., respectively, of the TCI field in the DCI for TRP / subcell #1. The next Y2 TCI states 267, 277, ..., 387 of the activated TCI states are mapped to codepoints 0, 1, ..., respectively, of the TCI field in the DCI for TRP / subcell #2.

[0202] Option 4: One MAC CE command activates multiple TCI states for one TRP / subcell of one supercell / cell. Multiple codepoints of the TCI field in the DCI may be mapped to multiple TCI states that are activated across all TRPs / subcells of one supercell / cell, respectively. This option may have at least one of the following features:

[0203] The MAC CE may contain an index corresponding to one TRP / subcell.

[0204] - The first Y0 code points (first code point group #0) of the multiple code points in the TCI field in the DCI may correspond to the first TRP / subcell #0 of all TRPs / subcells of a supercell / cell. The next Y1 code points (second code point group #1) of the multiple code points in the TCI field in the DCI may correspond to the second TRP / subcell #1 of all TRPs / subcells of that supercell / cell. This option may be illustrated by the following example:

[0205] 10, a first MAC CE activates Y0 TCI states for TRP / subcell #0 of a supercell / cell. The Y0 TCI states (TCI state IDs) 1, 5, ..., 102 are mapped to the first Y0 codepoints 0, 1, ..., Y0-1, respectively, of the multiple codepoints in the TCI field of the DCI. A second MAC CE activates Y1 TCI states for TRP / subcell #1 of the supercell / cell. The Y1 TCI states 134, 136, ..., 231 are mapped to the next Y1 codepoints Y0, Y0+1, ..., Y0+Y1-1, respectively, of the multiple codepoints in the TCI field of the DCI. The third MAC CE activates Y2 TCI states for TRP / subcell #2 of that supercell / cell, which are mapped to the next Y2 codepoints Y0+Y1, Y0+Y1+1, ..., Y0+Y1+Y2-1 of the TCI field in the DCI, respectively.

[0206] According to this embodiment, even if the cell and TRP association changes, the UE can be properly configured / instructed to have a TCI state for a single TRP / subcell transmission (single TRP transmission).

[0207] Third Embodiment This embodiment relates to joint DL / UL transmission of multiple TRPs / sub-cells based on a single DCI (single DCI-based multi-TRP joint transmission).

[0208] <<Number of active TCI states>> X for one supercell / cell or for one BWP of one supercell / cell Tci Up to X TCI states may be activated by a MAC CE command (Activation MAC CE, Activation Command). Tci may be the maximum number of TCI states in a MAC CE command.

[0209] X Tci may be greater than 16.Tci may follow at least one of the following formulas: Tci = Y Tci-perTrp *N Trp ◇X Tci = Y Tci-perCell *N Cell ◇X Tci = Y Tci-perTciGroup *N TciGroup ◇X Tci = Y Tci-perTciGroup *N TciGroup-PerTrpGroup *N TrpGroup ◇X Tci = Y Tci-perTciGroup *NTciGroup-PerCellGroup*N CellGroup

[0210] X Tci , N Trp , N Cell , Y Tci-perCell , Y Tci-perTrp , Y Tci-perTciGroup , N TciGroup , N TciGroup-PerTrpGroup , N TrpGroup ,NTciGroup-PerCellGroup,N CellGroup At least one of may be defined in the specification, provided by the RRC, or reported as a UE capability.

[0211] N Trp may refer to the number of TRPs with the same PCI or different PCIs in a super-cell / cell for joint transmission. Trp may be greater than 2. Cell Y may refer to the number of sub-cells with different PCIs in a super-cell / cell for joint transmission. Tci-perTrp Y may refer to the number (maximum) of TCI states per TRP of a supercell / cell. Tci-perCell may refer to the number (maximum number) of TCI states per sub-cell of a super-cell / cell.

[0212] Y Tci-perTciGroup One group of N TCI states may be applied to joint transmission. TciGroupUp to Y groups may be activated. Compared to NR, Tci-perTciGroup may be greater than 2, and N TciGroup may be greater than 8.

[0213] Y Tci-perTciGroup A group of TCI states may be applied to joint transmission. A group of TRPs / subcells may be used for joint transmission. The MAC CE is TrpGroup For each group of TRPs, N TCI states may be activated. TciGroup-PerTrpGroup groups may be activated. CellGroup TCI states for up to groups may be activated. For each group of subcells, NTciGroup-PerCellGroup groups of TCI states may be activated. For example, if there are four TRP groups: {TRP#1, TRP#2}, {TRP#1, TRP#3}, {TRP#2, TRP#4}, and {TRP#3, TRP#4}, eight TCI state groups are activated for each TRP group, with each TCI state group containing two TCI states, for a total of 64 TCI states.

[0214] <<Application to Assumption 2>> For the above-mentioned Assumption 2, at least one of the following features may be applied. ◇In NR, single DCI-based multi-TRP joint transmission using different PCIs is not supported. In this embodiment, single DCI-based multi-TRP joint transmission using different PCIs is supported. ◇Multiple TCI states activated by the MAC CE may be associated with SSB / CSI-RS of different PCIs. One group of TCI states applied to joint transmission may be associated with SSB / CSI-RS of different PCIs. ◇N CellMultiple TCI states for up to N different PCIs may be activated. ◇When multiple TCI states for N PCIs are activated, the N PCIs may include one serving cell PCI and N-1 additional PCIs different from the serving cell PCI, or may be N additional PCIs different from the serving cell PCI. ◇Variation: Multiple TRPs may be associated with one PCI. Multiple TCI states activated by the MAC CE may be associated with SSB / CSI-RS for different PCIs. A group of TCI states applied to joint transmission may be associated with SSB / CSI-RS for the same PCI.

[0215] <<Other Application Examples>> This embodiment is applicable to a case where the total number of TCI states activated for one supercell / cell is 16 or less (the same as the maximum number in the existing NR) (the maximum number of TCI states activated for one supercell / cell X Tci is less than or equal to 16).

[0216] Activation of TCI States The MAC CE signaling structure, the mapping between the TCI states activated by the MAC CE and the codepoints of the TCI fields in the DCI, may follow at least one of several options:

[0217] Option 1: One MAC CE command activates multiple TCI states across all TRPs / subcells of one supercell / cell. One field in the DCI (e.g., the TCI field) may be used for TCI indication. Codepoint i of the TCI field in the DCI may be mapped to the Yi TCI states activated by the MAC CE. This option may have at least one of the following features:

[0218] -◇If code point i is indicated, the corresponding Yi TCI states may be used for joint transmission. If Yi=1, a single TRP / subcell transmission using the indicated TCI state may be performed. -◇The Yi TCI states may correspond to the Yi TRPs / subcells of one supercell / cell. -◇Yi may be 1, 2, ..., Ymax. -◇Ymax may be the maximum number of TCI states / TRPs / subcells used for joint transmission. -◇Different code points may be mapped to different numbers of TCI states. -◇The MAC CE may indicate the number of TCI states to which the code point is mapped. For example, the MAC CE may indicate Yi.

[0219] In the example of Figure 11, the UE receives one MAC CE activating multiple TCI states across all TRPs / subcells of one supercell / cell, and receives a DCI containing one TCI field. The activated TCI states are divided into groups of Y0, Y1, ... TCI states. Code point 0 of the TCI field indicates the first Y0 TCI states (TCI state IDs) 0, 133, ..., 301 of the activated TCI states. Code point 1 of the TCI field indicates the next Y1 TCI states 2, 156 of the activated TCI states.

[0220] Option 2: One MAC CE command activates multiple TCI states for one TRP / subcell of one supercell / cell. Ymax fields (e.g., TCI fields) in the DCI may be used for TCI indication. One codepoint in one field in the DCI may be mapped to one TCI state activated by the MAC CE. This option may have at least one of the following features:

[0221] Y fields out of Ymax fields may indicate valid TCI states, and the other fields may indicate code points indicating that the field is not used. Y may be 1, 2, ..., Ymax. Ymax may be the maximum number of TCI states / TRPs / subcells used for joint transmission. Y TCI states indicated by Y fields may be used for joint transmission. If Y=1, a single TRP / subcell transmission using the TCI state indicated by that field may be performed. For example, up to four TRPs / subcells may be used for joint transmission. There are four fields in the DCI. One, two, three, or four fields may indicate valid TCI states. One, two, three, or four TCI states / TRPs / subcells may be used for joint transmission. Variation: Zmax fields in the DCI may be used for TCI indication. Zmax may refer to the number of candidate TRPs / subcells. TRPs / subcells for joint transmission may be selected from the candidate TRPs / subcells. Y fields from the Zmax fields may indicate valid TCI states, and the other fields may indicate codepoints indicating that the field is not used. Y may be 1, 2, ..., Ymax. The Y TCI states indicated by the Y fields may be used for joint transmission. Ymax may be the maximum number of TCI states / TRPs / subcells used for joint transmission. Zmax ≧ Ymax. For example, in a case where there are six candidate TRPs / subcells and five fields in the DCI, up to four fields indicate valid TCI states, and up to four TRPs / subcells are used for joint transmission.

[0222] 12, the UE receives Y MAC CEs #0, #1, #2 corresponding to Y=3 TRP / subcells #0, #1, #2 (TRP / subcell IDs = 0, 1, 2) of one super-cell / cell, respectively, and receives DCI containing Y TCI fields. MAC CE #0 (the first MAC CE) activates Y0 TCI states for TRP / subcell #0 (the first TRP / subcell). The Y0 TCI states (TCI state IDs) 1, 5, ..., 102 are mapped to multiple codepoints 0, 1, ..., Y0-1 of TCI field #0 (the first TCI field) in the DCI. MAC CE#1 (second MAC CE) activates Y1 TCI states for TRP / subcell#1 (second TRP / subcell). The Y1 TCI states 134, 136, ..., 231 are mapped to multiple code points 0, 1, ..., Y1-1 of TCI field#1 (second TCI field) in the DCI. MAC CE#2 (third MAC CE) activates Y2 TCI states for TRP / subcell#2 (third TRP / subcell). The Y2 TCI states 267, 277, ..., 387 are mapped to multiple code points 0, 1, ..., Y2-1 of TCI field#2 (third TCI field) in the DCI.

[0223] Option 3: One MAC CE command activates multiple TCI states across all TRPs / subcells of one supercell / cell. One field (e.g., TCI field) in the DCI may correspond to one TRP / subcell of one supercell / cell. One codepoint in the DCI may be mapped to one TCI state activated by the MAC CE. This option may have at least one of the following features:

[0224] -◇Of the multiple TCI states activated by the MAC CE, the first Y0 TCI states (first TCI state group #0) may correspond to the first (#0) TRP / subcell / field, and the next Y1 TCI states (second TCI state group #1) may correspond to the second (#1) TRP / subcell / field. -◇Y fields from the Ymax fields may indicate valid TCI states, and the other fields may indicate code points indicating that the field is not used. Y may be 1, 2, ..., Ymax. -◇Ymax may be the maximum number of TCI states / TRPs / subcells used for joint transmission. -◇The Y TCI states indicated by the Y fields may be used for joint transmission. If Y=1, a single TRP / subcell transmission using one TCI state indicated by that one field may be performed. - Variation: Zmax fields in the DCI may be used for TCI indication. Zmax may refer to the number of candidate TRPs / subcells. The TRPs / subcells for joint transmission may be selected from the candidate TRPs / subcells. Y fields from the Zmax fields may indicate valid TCI states, and the other fields may indicate codepoints indicating that the field is not used. Y may be 1, 2, ..., Ymax. The Y TCI states indicated by the Y fields may be used for joint transmission. Ymax may be the maximum number of TCI states / TRPs / subcells used for joint transmission. Zmax may be ≧ Ymax. For example, there are six candidate TRPs / subcells. There are five fields in the DCI. Up to four fields indicate valid TCI states, and up to four TRPs / subcells are used for joint transmission.

[0225] In the example of Figure 13, a UE receives one MAC CE activating multiple TCI states across Y=3 TRP / subcells #0, #1, #2 (TRP / subcell IDs = 0, 1, 2) of one super-cell / cell, and receives a DCI containing Y TCI fields. The first Y0 TCI states (first TCI state group #0) of the activated multiple TCI states correspond to TRP / subcell #0 (first TRP / subcell). The Y0 TCI states (TCI state IDs) 1, 5, ..., 102 are mapped to multiple codepoints 0, 1, ..., Y0-1 of TCI field #0 (first TCI field) in the DCI, respectively. The next Y1 TCI states (second TCI state group #1) of the activated TCI states correspond to TRP / subcell #1 (second TRP / subcell). The Y1 TCI states 134, 136, ..., 231 are mapped to codepoints 0, 1, ..., Y1-1 of TCI field #1 (second TCI field) in the DCI. The next Y2 TCI states (third TCI state group #2) of the activated TCI states correspond to TRP / subcell #2 (third TRP / subcell). The Y2 TCI states 267, 277, ..., 387 are mapped to codepoints 0, 1, ..., Y2-1 of TCI field #2 (third TRP / subcell) in the DCI.

[0226] Option 4: One MAC CE command activates multiple TCI states for one TRP / subcell of one supercell / cell. One field in the DCI (e.g., the TCI field) may be used for TCI indication. Codepoint i of the TCI field in the DCI may be mapped to the Yi TCI states activated by the MAC CE. This option may have at least one of the following features:

[0227] -◇If code point i is indicated, the corresponding Yi TCI states may be used for joint transmission. If Yi=1, a single TRP / subcell transmission using the indicated TCI state may be performed. -◇The Yi TCI states may correspond to the Yi TRPs / subcells of one supercell / cell. -◇Yi may be 1, 2, ..., Ymax. -◇Ymax may be the maximum number of TCI states / TRPs / subcells used for joint transmission. -◇Different code points may be mapped to different numbers of TCI states.

[0228] 14, the UE receives Y MAC CEs #0, #1, #2 corresponding to Y=3 TRP / subcells #0, #1, #2 (TRP / subcell IDs = 0, 1, 2) of one super-cell / cell, respectively, and receives a DCI containing one TCI field. MAC CE #0 (the first MAC CE) activates Y TCI states for TRP / subcell #0 (the first TRP / subcell). The Y0 TCI states (TCI state IDs) 1, 5, ..., 102 are mapped to multiple codepoints 0, 1, ..., Y0-1 of the TCI field in the DCI, respectively. MAC CE #1 (the second MAC CE) activates Y1 TCI states for TRP / subcell #1 (the second TRP / subcell). The Y1 TCI states 134, 136, ..., 231 are mapped to multiple code points 0, 1, ..., Y1-1 of the TCI field in the DCI, respectively. MAC CE#2 (third MAC CE) activates Y2 TCI states for TRP / subcell#2 (third TRP / subcell), and the Y2 TCI states 267, 277, ..., 387 are mapped to multiple code points 0, 1, ..., Y2-1 of the TCI field in the DCI, respectively.

[0229] According to this embodiment, even if the cell and TRP association is changed, the UE can be properly configured / instructed to have a TCI state for joint transmission of multiple TRPs / subcells based on a single DCI (single DCI-based multi-TRP joint transmission).

[0230] <Embodiment 4> This embodiment relates to another aspect for joint DL / UL transmission of multiple TRPs / sub-cells based on a single DCI (single DCI-based multi-TRP joint transmission).

[0231] The TCI indication method may be similar to the Rel. 18 unified TCI framework in NR.

[0232] <<Number of Active TCI States>> The UE may maintain Zmax TCI states at all times. Zmax may be the number of candidate TRPs / subcells. Multiple TRPs / subcells for joint transmission may be selected from multiple candidate TRPs / subcells. For each of DL and UL transmissions, it may be indicated that Y TCI states / TRPs / subcells from Zmax TCI states / TRPs / subcells are used for joint transmission. If Y=1, a single TRP / subcell transmission (single-TRP transmission) may be performed. This TCI state may have at least one of the following characteristics: ◇Y may be 1, 2, ..., Ymax. Ymax may be the maximum number of TCI states / TRPs / subcells used for joint transmission. ◇Compared to NR, Zmax may be greater than 2, and Ymax may be greater than 2. ◇For example, in the case where there are six candidate TRPs / subcells and up to four TRPs / subcells are used for joint transmission, the UE is instructed to always maintain six TCI states and to use up to four TCI states from the six TCI states for joint transmission in each of the DL transmission and the UL transmission.

[0233] MAC CE activation in the TCI state may have at least one of the following characteristics: X for one supercell / cell or for one BWP of one supercell / cell Tci Up to X TCI states may be activated by a MAC CE command (Activation MAC CE, Activation Command). Tci may be the maximum number of TCI states in a MAC CE command. Tci may be greater than 16. Tci may follow at least one of the following formulas: Tci = Y Tci-perTrp *N Trp ―◇X Tci = Y Tci-perCell *N Cell ◇X Tci , N Trp , N Cell , Y Tci-perCell , Y Tci-perTrp , may be defined in the specification, may be provided by the RRC, or may be reported as a UE capability. Trp may refer to the number of TRPs with the same PCI or different PCIs in a super-cell / cell for joint transmission. Cell Y may refer to the number of sub-cells with different PCIs in a super-cell / cell for joint transmission. Tci-perTrp Y may refer to the number (maximum) of TCI states per TRP of a supercell / cell. Tci-perCell may refer to the number (maximum number) of TCI states per sub-cell of a super-cell / cell.

[0234] <<Application to Assumption 2>> For the above-mentioned Assumption 2, at least one of the following features may be applied: ◇Multiple TCI states activated by a MAC CE may be associated with SSB / CSI-RS of different PCIs. ◇N CellMultiple TCI states for up to N different PCIs may be activated. If multiple TCI states for N PCIs are activated, the N PCIs may include one serving cell PCI and N-1 additional PCIs different from the serving cell PCI, or may be N additional PCIs different from the serving cell PCI.

[0235] <<Other Application Examples>> This embodiment is applicable to a case where the total number of TCI states activated for one supercell / cell is 16 or less (the same as the maximum number in the existing NR) (the maximum number of TCI states activated for one supercell / cell X Tci is less than or equal to 16).

[0236] Activation / Update of TCI States The MAC CE signaling structure, the mapping between the TCI states activated by the MAC CE and the codepoints of the TCI fields in the DCI, may follow at least one of several options: The signal structure is similar to that of the third embodiment, but the interpretation of the signal is different from that of the third embodiment.

[0237] Option 1: One MAC CE command activates multiple TCI states across all TRPs / subcells of one supercell / cell. One field in the DCI (e.g., the TCI field) may be used for TCI indication. Code point i of the TCI field in the DCI may be mapped to Zi TCI states activated by the MAC CE. This option may have at least one of the following features: If code point i is indicated, Zi TCI states from Zmax TCI states may be updated. Other TCI states may remain unchanged. Zi TCI states may correspond to Zi TRPs / subcells of one supercell / cell. Zi may be 1, 2, ..., Zmax. Different code points may be mapped to different numbers of TCI states. The MAC CE may indicate the number of the TCI state to which the codepoint is mapped. For example, the MAC CE may indicate Zi.

[0238] ◇Option 2: One MAC CE command activates multiple TCI states for one TRP / subcell of one supercell / cell. Zmax fields (e.g., TCI fields) in the DCI may be used for TCI indication. One field may correspond to one candidate TRP / subcell. One codepoint in one field may be mapped to one TCI state activated by the MAC CE. This option may have at least one of the following features: ◇Z fields out of Zmax fields may indicate valid TCI states, and the other fields may indicate codepoints indicating that the field is not used. Z may be 1, 2, ..., Zmax. ◇The Z TCI states indicated by the Z fields may be updated. The other TCI states may remain unchanged.

[0239] Option 3: One MAC CE command activates multiple TCI states across all TRPs / subcells of one supercell / cell. Zmax fields (e.g., TCI fields) in the DCI may be used for TCI indication. One field may correspond to one TRP / subcell of one supercell / cell. One code point in one field may be mapped to one TCI state activated by the MAC CE. This option may have at least one of the following features: - Of the multiple TCI states activated by the MAC CE, the first Y0 TCI states (first TCI state group #0) may correspond to the first (#0) TRP / subcell / field, and the next Y1 TCI states (second TCI state group #1) may correspond to the second (#1) TRP / subcell / field. - Z fields out of Zmax fields may indicate valid TCI states, and the other fields may indicate codepoints indicating that the field is not used. Z may be 1, 2, ..., Zmax. - Z TCI states indicated by the Z fields may be updated. Other TCI states may remain unchanged.

[0240] Option 4: One MAC CE command activates multiple TCI states for one TRP / subcell of one supercell / cell. One field in the DCI (e.g., the TCI field) may be used for TCI indication. Code point i of the TCI field in the DCI may be mapped to Zi TCI states activated by the MAC CE. This option may have at least one of the following features: If code point i is indicated, Zi TCI states from Zmax TCI states may be updated. Other TCI states may remain unchanged. Zi TCI states may correspond to Zi TRPs / subcells of one supercell / cell. Zi may be 1, 2, ..., Zmax. Different code points may be mapped to different numbers of TCI states.

[0241] In the example of Figure 15, the UE maintains Zmax = 6 active TCI states. The UE then receives a DCI containing Zmax TCI fields, the second of which indicates a valid TCI state. The UE updates the TCI state of the second TRP / subcell #1 (TRP / subcell ID = 1) to the indicated valid TCI state.

[0242] In the example of Figure 16, the UE maintains Zmax = 6 active TCI states. The UE then receives a DCI containing Zmax TCI fields, the second and fourth of which indicate valid TCI states. The UE updates the TCI state of the second TRP / subcell # (TRP / subcell ID = 1) 1 and the TCI state of the fourth TRP / subcell # 3 to the indicated two valid TCI states, respectively.

[0243] In the example of Figure 17A, the UE maintains Zmax = 6 active TCI states. The UE then receives an indication (e.g., DCI) to use Y = 2 TRP / subcell / TCI states out of the Zmax candidate TRP / subcell / TCI states for transmission. The UE uses the indicated second and third TRP / subcell / TCI states #1 and #2 (TRP / subcell IDs = 1 and 2) for joint transmission.

[0244] In the example of Figure 17B, the UE maintains Zmax = 6 active TCI states. The UE then receives an indication (e.g., DCI) to use Y = 4 TRP / subcell / TCI states out of the Zmax candidate TRP / subcell / TCI states for transmission. The UE uses the indicated first, second, fourth, and sixth TRP / subcell / TCI states #0, #1, #4, #6 (TRP / subcell IDs = 0, 1, 4, 6) for joint transmission.

[0245] In the example of Figure 17C, the UE maintains Zmax = 6 active TCI states. The UE then receives an indication (e.g., DCI) to use Y = 1 TRP / subcell / TCI state out of the Zmax candidate TRP / subcell / TCI states for transmission. The UE uses the second indicated TRP / subcell / TCI state #1 (TRP / subcell ID = 1) for single TRP / subcell transmission.

[0246] According to this embodiment, the UE can be properly configured / instructed on the TCI status for one or more TRPs / sub-cells even when the cell and TRP association is changed.

[0247] <Embodiment 5> This embodiment relates to joint DL / UL transmission of multiple TRPs / sub-cells based on multiple DCIs (multi-DCI-based multi-TRP joint transmission).

[0248] Similar to NR, CORESET groups / pools (CORESET group, CORESET pool, CORESETPoolIndex) may be defined. MAC CE commands may activate TCI states for each CORESET group. Multiple codepoints in the TCI field in DCI may be mapped to multiple TCI states for the corresponding CORESET group, respectively.

[0249] In the present disclosure, a CORESET group may be a set of resources for DCI monitoring, for example, a group of search spaces / search space sets.

[0250] <<Relationship Between CORESET Groups and TRPs / Sub-Cells>> The relationship between CORESET groups and TRPs / sub-cells may follow at least one of several options below.

[0251] ◇Option 1: One CORESET group is mapped to one TRP / subcell of one supercell / cell. The UE may receive multiple DCIs (multi-DCI) in multiple CORESET groups (CORESETs in multiple CORESET groups), respectively. Joint transmission of multiple TRPs / subcells based on multi-DCI (multi-DCI-based multi-TRP joint transmission) may also be performed. This option may have at least one of the following features:

[0252] - Compared to NR, more than two CORESET groups may be configured by RRC.

[0253] -◇For one CORESET group, or for one supercell / cell, or for one BWP of one supercell / cell, X Tci Up to TCI states may be activated by a MAC CE command (Activation MAC CE, Activation Command).

[0254] - One field in the DCI (e.g., the TCI field) may be used for TCI indication, and one code point in the TCI field may be mapped to one TCI state.

[0255] -◇For one supercell / cell or for one BWP of one supercell / cell, in total, X Tci *N CORESET-Group Up to X TCI states may be activated. Tci *N Trp Up to X TCI states may be activated. Tci *N Cell Up to N TCI states may be activated. Each parameter may follow at least one of the following characteristics: Trp may refer to the number of TRPs with the same PCI or different PCIs in a super-cell / cell for coordinated / joint transmission. Trp may be greater than 2. Cell N may refer to the number of sub-cells with different PCIs in a super-cell / cell for coordinated / joint transmission. CORESET-Group may refer to the number of CORESET groups for cooperative / joint transmission. Compared with NR, N CORESET-Group may be greater than 2. Tci , N Trp , N Cell , N CORESET-Group At least one of may be defined in the specification, provided by the RRC, or reported as a UE capability.

[0256] For the above assumption 2, at least one of the following characteristics may be applied: Multiple TCI states activated by a MAC CE for one CORESET group may be associated with the SSB / CSI-RS of the same PCI. For one super-cell / cell, N CellMultiple TCI states associated with up to PCIs may be activated. Compared to NR, N Cell may be greater than 2. - When multiple TCI states of N PCIs are activated, the N PCIs may include one serving cell PCI and N-1 additional PCIs different from the serving cell PCI, or may be N additional PCIs different from the serving cell PCI.

[0257] 18, the UE receives Y MAC CEs #0, #1, #2 corresponding to Y=3 CORESET groups / TRPs / subcells #0, #1, #2 (CORESET group / TRP / subcell IDs = 0, 1, 2) of one supercell / cell, and receives DCIs in the CORESET within each CORESET group. Each DCI contains one TCI field. MAC CE #0 (the first MAC CE) activates Y0 TCI states for CORESET group / TRP / subcell #0 (the first CORESET group / TRP / subcell). The Y0 TCI states (TCI state IDs) 1, 5, ..., 102 are mapped to multiple code points 0, 1, ..., Y0-1 of the TCI field in the DCI in CORESET group #0, respectively. MAC CE #1 (second MAC CE) activates Y1 TCI states for CORESET group / TRP / subcell #1 (second CORESET group / TRP / subcell). The Y1 TCI states 134, 136, ..., 231 are mapped to multiple code points 0, 1, ..., Y1-1 of the TCI field in the DCI in CORESET group #1, respectively. MAC CE#2 (the third MAC CE) activates Y2 TCI states for CORESET group / TRP / subcell#2 (the third CORESET group / TRP / subcell), and the Y2 TCI states 267, 277, ..., 387 are mapped to multiple code points 0, 1, ..., Y2-1 of the TCI field in the DCI in CORESET group#2, respectively.

[0258] Option 2: One CORESET group is mapped to multiple TRPs / subcells of one supercell / cell. Single TRP / subcell transmission with dynamic TRP / subcell switching based on DCI within one CORESET group may be performed. This option may have at least one of the following features:

[0259] - Compared to NR, more than two CORESET groups may be configured by RRC.

[0260] - For one CORESET group in one supercell / cell or in one BWP of one supercell / cell, X is assigned by MAC CE. Tci Up to X TCI states may be activated. Tci may follow at least one of the following formulas: Tci = Y Tci-perTrp *N Trp ――◇X Tci = Y Tci-perCell *N Cell

[0261] Each parameter may comply with at least one of the following characteristics: Trp may refer to the number of TRPs with the same PCI or different PCIs that are associated with the same CORESET group of supercells / cells for cooperative transmission. Trp One TRP may be used with dynamic switching between N TRPs. Cell may refer to the number of sub-cells with different PCIs that are associated with the same CORESET group of super-cells / cells for cooperative transmission. Cell One TRP based on dynamic switching between subcells may be used. Tci-perTrp Y may refer to the number (maximum) of TCI states per TRP of a supercell / cell. Tci-perCellmay refer to the number (maximum) of TCI states per subcell of a supercell / cell. - ◇ For one supercell / cell or for one BWP of one supercell / cell, in total, X Tci *N CORESET-Group Up to N TCI states may be activated. CORESET-Group may refer to the number of CORESET groups in one supercell / cell or in one BWP of one supercell / cell. Tci , N Trp , N Cell , Y Tci-perTrp , Y Tci-perCell , N CORESET-Group , at least one of which may be defined in the specification, provided by the RRC, or reported as a UE capability.

[0262] For the above assumption 2, at least one of the following characteristics may be applied: Multiple TCI states activated by a MAC CE for one CORESET group may be associated with SSB / CSI-RS of different PCIs. Cell Multiple TCI states associated with up to N different PCIs may be activated for one super-cell / cell. Multiple TCI states associated with up to N different PCIs may be activated for one super-cell / cell. N is N Cell or N Cell *N CORESET-Group --When multiple TCI states of N PCIs are activated, the N PCIs may include one serving cell PCI and N-1 additional PCIs different from the serving cell PCI, or may be N additional PCIs different from the serving cell PCI.

[0263] Option 3: One CORESET group is mapped to multiple TRPs / subcells of one supercell / cell. Joint transmission of multiple TRPs / subcells based on a single DCI within one CORESET group (single DCI-based multi-TRP joint transmission) may be performed. This option may have at least one of the following features:

[0264] - Compared to NR, more than two CORESET groups may be configured by RRC.

[0265] - For one CORESET group in one supercell / cell or in one BWP of one supercell / cell, X is assigned by MAC CE. Tci Up to X TCI states may be activated. Tci may follow at least one of the following formulas: Tci = Y Tci-perTrp *N Trp ――◇X Tci = Y Tci-perCell *N Cell ――◇X Tci = Y Tci-perTciGroup *N TciGroup ――◇X Tci = Y Tci-perTciGroup *N TciGroup-perTrpGroup *N TrpGroup ――◇X Tci = Y Tci-perTciGroup *NTciGroup-perCellGroup*N CellGroup

[0266] Each parameter may comply with at least one of the following characteristics: Trp may refer to the number of TRPs with the same PCI or different PCIs that are associated with the same CORESET group of supercells / cells for joint transmission. Cell Y may refer to the number of sub-cells with different PCIs associated with the same CORESET group of super-cells / cells for joint transmission. Tci-perTrpY may refer to the number (maximum) of TCI states per TRP of a supercell / cell. Tci-perCell Y may refer to the number of TCI states (maximum) per sub-cell of a super-cell / cell. Tci-perTciGroup A group of N TCI states may be applied. The MAC CE TciGroup groups may be activated. Compared to NR, Y Tci-perTciGroup can be greater than 2. For joint transmission, Y Tci-perTciGroup A group of TCI states may be applied. A group of TRPs / subcells may be used for joint transmission. The MAC CE is TrpGroup For each group of TRPs, N TCI states may be activated. TciGroup-perTrpGroup groups may be activated. CellGroup For each group of subcells, NTciGroup-perCellGroup groups of TCI states may be activated. - A total of X TCI states may be activated for one supercell / cell or for one BWP of one supercell / cell. Tci *N CORESET-Group Up to N TCI states may be activated. CORESET-Group may refer to the number of CORESET groups in one supercell / cell or in one BWP of one supercell / cell. Tci , N Trp , N Cell , Y Tci-perTrp , Y Tci-perCell , N CORESET-Group , Y Tci-perTciGroup , N TciGroup , N TciGroup-perTrpGroup , N TrpGroup , NTciGroup-perCellGroup, N CellGroup , at least one of which may be defined in the specification, provided by the RRC, or reported as a UE capability.

[0267] -◇For the above assumption 2, at least one of the following features may be applied: -◇Multiple TCI states activated by a MAC CE for one CORESET group may be associated with SSB / CSI-RS of different PCIs. A group of TCI states applied to single DCI-based joint transmission may be associated with SSB / CSI-RS of different PCIs. -◇For one CORESET group, N Cell Multiple TCI states associated with up to N different PCIs may be activated for one super-cell / cell. Multiple TCI states associated with up to N different PCIs may be activated for one super-cell / cell. N is N Cell or N Cell *N CORESET-Group ◇When multiple TCI states for N PCIs are activated, the N PCIs may include one serving cell PCI and N-1 additional PCIs different from the serving cell PCI, or may be N additional PCIs different from the serving cell PCI. ◇Variation: Multiple TRPs may be associated with one PCI. Multiple TCI states activated by the MAC CE for one CORESET group may be associated with SSB / CSI-RS for different PCIs. One group of TCI states applicable to single DCI-based joint transmission may be associated with SSB / CSI-RS for the same PCI. ◇Variation: Multiple TRPs may be associated with one PCI. Multiple TCI states activated by the MAC CE for one CORESET group may be associated with SSB / CSI-RS for the same PCI. A group of TCI states applied to a single DCI-based joint transmission may be associated with the SSB / CSI-RS of the same PCI.

[0268] <<Application of Other Embodiments>> The MAC CE signaling structure and the mapping between the TCI state activated by the MAC CE and the code point of the TCI field in the DCI may be adapted from Embodiments 2, 3, and 4 by applying them for each CORESET group.

[0269] According to this embodiment, even if the cell and TRP association changes, the UE can be properly configured / instructed on the TCI status for single or multiple TRPs / sub-cells based on single DCI or multi-DCI.

[0270] Sixth Embodiment This embodiment relates to MAC CE overhead.

[0271] To reduce MAC CE overhead, the following method may be applied to at least one of embodiments 1 to 5.

[0272] Updating a Subset of Active TCI States A MAC CE command (Activation MAC CE, Activation Command) may update a subset of TCI states for one supercell / cell or for one TRP / subcell of one supercell / cell. Other TCI states activated by previous MAC CE commands may be maintained. This embodiment may follow at least one of the following options:

[0273] Option 1: A subset of activated TCI states may be replaced by a new subset of activated TCI states. In the example of Figure 19, the MAC CE indicates TCI states (TCI state IDs) 10, 12, and 43 for the third, fourth, and fifth TCI states (TCI states corresponding to code points 2, 3, and 4) of the activated TCI states. In response to receiving the MAC CE, the UE updates the indicated active TCI states and maintains (does not update) the active TCI states other than the indicated TCI states.

[0274] Option 2: A subset of activated TCI states may be updated to be deactivated (released). In the example of Figure 20, the MAC CE indicates the deactivation of the third, fourth, and fifth TCI states (TCI states corresponding to code points 2, 3, and 4) among the activated TCI states. In response to receiving the MAC CE, the UE deactivates the indicated TCI states and maintains the active TCI states other than the indicated TCI states.

[0275] Option 3: A new subset of TCI states may be activated, while previously activated TCI states may remain activated. In the example of Fig. 21, the MAC CE indicates TCI states (TCI state IDs) 120, 201, and 222. Upon receiving the MAC CE, the UE adds the indicated TCI states (associates the indicated TCI states with additional code points) and maintains active TCI states other than the indicated TCI states.

[0276] <<Subset Indication Contents>> The subset indication may follow at least one of the following options: ◇Option 1: The MAC CE indicates a subset of TCI states. For example, the MAC CE may indicate a subset of TCI states including the (i+1)th activated TCI state, or a subset of TCI states including the (i+1)th to (#i+L)th activated TCI states, or a subset of TCI states including the {i+1, j+1, k+1, ...}th activated TCI states. ◇Option 2: The MAC CE indicates a subset of code points. For example, the MAC CE may indicate the (i+1)th code point i, or the (i+1)th to (i+L)th code points i to i+L-1, or the {i+1, j+1, k+1, ...}th code points {i, j, k, ...}. A subset of the TCI states mapped to the indicated subset of code points may be updated.

[0277] According to this embodiment, even when the cell and TRP association is changed, the UE can be appropriately configured / instructed to have the TCI state set while reducing overhead.

[0278] <Supplementary Information> [Notification of Information to UE] In the above-described embodiments, any information may be notified to the UE (from a network (NW) (e.g., a base station (BS))) (in other words, reception of any information from the BS by the UE) using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0279] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader, which is not defined in existing standards.

[0280] When the notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0281] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0282] [Notification of Information from UE] In the above-described embodiments, notification of any information from the UE (to the NW) (in other words, transmission / report of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0283] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID, which is not defined in existing standards, in the MAC subheader.

[0284] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0285] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0286] [Application of Each Embodiment] At least one of the above-described embodiments may be applied when a specific condition is met. The specific condition may be defined in a standard or may be notified to a UE / BS using higher layer signaling / physical layer signaling.

[0287] The specific condition may indicate at least one of the following: ◇ At least one of the above-mentioned embodiments is enabled.

[0288] At least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.

[0289] The specific UE capability may indicate at least one of the following: ◇Supporting specific processing / operation / control / information for at least one of the above embodiments. ◇The UE supports cell-free. ◇The UE supports transmission of a single TRP / sub-cell in cell-free mode (single-TRP transmission). ◇The UE supports joint transmission of multiple TRPs / sub-cells based on a single DCI in cell-free mode (single-DCI-based multi-TRP joint transmission). ◇The UE supports joint transmission of multiple TRPs / sub-cells based on multiple DCIs in cell-free mode (multi-DCI-based multi-TRP joint transmission).

[0290] Furthermore, the above-mentioned specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or may be a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0291] Furthermore, the specific UE capability may be a capability that is applied to all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0292] Furthermore, at least one of the above-described embodiments may be applied when a UE configures / activates / triggers specific information related to the above-described embodiments (or performs the operations of the above-described embodiments) through higher layer signaling / physical layer signaling. The specific information may indicate at least one of the following: ◇ Information indicating enabling / disabling the operations of the above-described embodiments. ◇ RRC parameters for a specific release (e.g., Rel. 18 / 19). The RRC parameters may have names that are the names of existing RRC parameters with "r18" / "r19" added.

[0293] If the UE does not support at least one of the specific UE capabilities or is not configured with the specific information, the UE may apply, for example, Rel. 15 / 16 behavior.

[0294] (Supplementary Notes) The following inventions are supplementary notes regarding one embodiment of the present disclosure. [Supplementary Note 1] A terminal, comprising: a receiver that receives one or more commands indicating a plurality of transmission configuration indicator (TCI) states and receives downlink control information indicating one TCI state of the plurality of TCI states; and a controller that controls reception or transmission using the one TCI state, wherein the plurality of TCI states are associated with a plurality of cell identifiers. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the one or more commands are one command indicating the plurality of TCI states. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the one or more commands are a plurality of commands respectively associated with the plurality of cell identifiers. [Supplementary Note 4] The terminal according to any one of Supplementary Notes 1 to 3, wherein the receiver receives a plurality of lists respectively corresponding to the plurality of cell identifiers, and the plurality of TCI states are included in the plurality of lists.

[0295] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiver that receives one or more commands indicating a plurality of transmission configuration indicator (TCI) states and receives one downlink control information indicating two or more TCI states among the plurality of TCI states; and a controller that controls reception or transmission using the two or more TCI states, wherein the plurality of TCI states are associated with a plurality of cell identifiers. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the one or more commands are one command indicating the plurality of TCI states. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the one or more commands are a plurality of commands respectively associated with the plurality of cell identifiers. [Supplementary Note 4] The terminal according to any one of Supplementary Notes 1 to 3, wherein the receiver receives a plurality of lists respectively corresponding to the plurality of cell identifiers, and the plurality of TCI states are included in the plurality of lists.

[0296] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiver that receives a plurality of commands indicating a plurality of transmission configuration indicator (TCI) states associated with a plurality of groups of resource sets for monitoring a downlink control channel, and that receives one or more downlink control information in one or more groups among the plurality of groups; and a controller that controls reception or transmission using one or more TCI states among the plurality of TCI states, the one or more TCI states being indicated by the one or more downlink control information, wherein the plurality of groups are associated with a plurality of cell identifiers. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein one group among the plurality of groups is associated with one cell identifier among the plurality of cell identifiers, and the one or more downlink control information is one downlink control information indicating one TCI state. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein one group among the plurality of groups is associated with two or more cell identifiers among the plurality of cell identifiers, and the one or more downlink control information is one downlink control information indicating one TCI state. [Supplementary Note 4] The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein one group among the plurality of groups is associated with two or more cell identifiers among the plurality of cell identifiers, and the one or more downlink control information is two or more downlink control information indicating two or more TCI states, respectively.

[0297] (Wireless Communication System) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0298] 22 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 (which may be simply referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0299] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0300] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (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.

[0301] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0302] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0303] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0304] 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 higher than 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 higher frequency band than FR2.

[0305] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0306] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an 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.

[0307] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0308] The core network 30 may include network functions (Network Functions (NF)) such as a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). A single network node may provide multiple functions. Communication with an external network (e.g., the Internet) may also be performed via the DN.

[0309] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0310] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0311] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0312] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0313] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), or the like may be used as an uplink channel.

[0314] 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).

[0315] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0316] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0317] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0318] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0319] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0320] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0321] 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.

[0322] 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 an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0323] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0324] 23 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0325] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0326] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0327] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0328] 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.

[0329] 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, the RF unit 122, and a measurement unit 123.

[0330] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0331] 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.

[0332] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0333] The transmitter / receiver unit 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.

[0334] The transmitter / receiver unit 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.

[0335] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0336] 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 band signal received by the transceiver antenna 130.

[0337] 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.

[0338] 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.

[0339] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0340] 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.

[0341] The transceiver 120 may transmit one or more commands indicating a plurality of transmission configuration indicator (TCI) states, and may transmit downlink control information indicating one of the plurality of TCI states. The controller 110 may control reception or transmission using the one TCI state. The plurality of TCI states may be associated with a plurality of cell identifiers.

[0342] The transceiver 120 may transmit one or more commands indicating a plurality of transmission configuration indicator (TCI) states, and may transmit one piece of downlink control information indicating two or more TCI states among the plurality of TCI states. The controller 110 may control reception or transmission using the two or more TCI states. The plurality of TCI states may be associated with a plurality of cell identifiers.

[0343] The transceiver 120 may transmit a plurality of commands indicating a plurality of transmission configuration indicator (TCI) states associated with a plurality of groups of resource sets for monitoring a downlink control channel, and may transmit one or more downlink control information in one or more groups among the plurality of groups. The controller 110 may control reception or transmission using one or more TCI states among the plurality of TCI states, the one or more TCI states being indicated by the one or more downlink control information. The plurality of groups may be associated with a plurality of cell identifiers.

[0344] (User terminal) Fig. 24 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0345] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0346] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0347] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0348] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured 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.

[0349] 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.

[0350] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0351] 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.

[0352] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0353] 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.

[0354] The transmitter / receiver unit 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 string to be transmitted, and output a baseband signal.

[0355] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0356] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0357] 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 band signal received by the transceiver antenna 230.

[0358] The transceiver unit 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.

[0359] 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.

[0360] The measurement unit 223 may derive channel measurements for CSI calculation based on the channel measurement resources. The channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources. The measurement unit 223 may also derive interference measurements for CSI calculation based on the interference measurement resources. The interference measurement resources may be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, etc. Note that CSI-IM may be referred to as CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS. Note that in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeably read as interchangeable.

[0361] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0362] The transceiver 220 may receive one or more commands indicating multiple transmission configuration indicator (TCI) states and may receive downlink control information indicating one of the multiple TCI states. The controller 210 may control reception or transmission using the single TCI state (e.g., DL / UL transmission of a single TRP / subcell). The multiple TCI states may be associated with multiple cell identifiers (e.g., identifiers corresponding to TRPs / subcells).

[0363] The one or more commands may be a single command indicating the plurality of TCI states.

[0364] The one or more commands may be a plurality of commands respectively associated with the plurality of cell identifiers.

[0365] The transceiver 220 may receive a plurality of lists respectively corresponding to the plurality of cell identifiers, and the plurality of TCI states may be included in the plurality of lists.

[0366] The transceiver unit 220 may receive one or more commands indicating multiple transmission configuration indicator (TCI) states and may receive one piece of downlink control information indicating two or more TCI states among the multiple TCI states. The controller 210 may control reception or transmission using the two or more TCI states (e.g., joint DL / UL transmission of multiple TRPs / subcells based on a single DCI). The multiple TCI states may be associated with multiple cell identifiers.

[0367] The one or more commands may be a single command indicating the plurality of TCI states.

[0368] The one or more commands may be a plurality of commands respectively associated with the plurality of cell identifiers.

[0369] The transceiver 220 may receive a plurality of lists respectively corresponding to the plurality of cell identifiers, and the plurality of TCI states may be included in the plurality of lists.

[0370] The transceiver unit 220 may receive commands indicating transmission configuration indicator (TCI) states associated with multiple groups (e.g., CORESET groups, CORESET pools) of resource sets (e.g., CORESETs) for monitoring downlink control channels, and may receive one or more downlink control information in one or more groups among the multiple groups. The controller 210 may control reception or transmission (e.g., joint DL / UL transmission of multiple TRPs / subcells based on multiple DCIs) using one or more TCI states among the multiple TCI states indicated by the one or more downlink control information. The multiple groups may be associated with multiple cell identifiers.

[0371] One of the plurality of groups may be associated with one of the plurality of cell identifiers. The one or more downlink control information may be one downlink control information indicating one TCI state.

[0372] The one or more groups may be associated with two or more cell identifiers of the plurality of cell identifiers. The one or more downlink control information may be one downlink control information indicating one TCI state.

[0373] The one or more groups may be associated with two or more cell identifiers of the plurality of cell identifiers. The one or more downlink control information may be two or more downlink control information indicating two or more TCI states, respectively.

[0374] (Hardware Configuration) Note that the block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0375] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0376] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 25 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0377] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used 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.

[0378] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0379] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0380] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0381] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0382] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0383] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a 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.

[0384] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0385] 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 outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0386] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0387] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0388] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0389] 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.

[0390] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0391] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0392] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0393] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0394] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0395] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0396] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0397] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0398] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0399] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0400] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0401] 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 which may be composed of one or more resource blocks.

[0402] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0403] 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.

[0404] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0405] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0406] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0407] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0408] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0409] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0410] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0411] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0412] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0413] 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.

[0414] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0415] 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).

[0416] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0417] 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.

[0418] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), these wired and / or wireless technologies are included within the definition of transmission media.

[0419] 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).

[0420] 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," "layer," "number of layers," "rank," "resource," "resource set," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "UE panel," "transmitting entity," "receiving entity," etc. may be used interchangeably.

[0421] In the present disclosure, the term "antenna port" may be interchangeably read as an antenna port for any signal / channel (e.g., a demodulation reference signal (DMRS) port). In the present disclosure, the term "resource" may be interchangeably read as a resource for any signal / channel (e.g., a reference signal resource, an SRS resource, etc.). The resource may include time / frequency / code / space / power resources. Furthermore, the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0422] The group may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0423] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable terms.

[0424] In addition, in the present disclosure, the terms TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, etc. may be read interchangeably.

[0425] Furthermore, in the present disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) property," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

[0426] In the present disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interchangeable. In the present disclosure, terms such as sequence, list, set, group, cluster, and subset may be interchangeable.

[0427] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information (TCI state)" may be interchangeable with "set of spatial relationship information (TCI state)", "one or more pieces of spatial relationship information", etc. The TCI state and the TCI may be interchangeable. The spatial relationship information and the spatial relationship may be interchangeable.

[0428] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0429] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0430] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0431] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0432] 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.

[0433] 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. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0434] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0435] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0436] 26 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0437] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0438] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0439] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0440] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0441] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0442] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0443] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0444] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0445] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0446] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0447] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0448] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0449] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0450] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0451] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0452] Each aspect / embodiment described in the present disclosure may be a technology other than 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 (x is, for example, an integer or decimal number)), 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 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0453] 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."

[0454] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0455] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0456] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0457] Furthermore, "determination" may be considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "determining" some kind of action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0458] Furthermore, in this disclosure, "determine / determining" may be interchangeably read as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "does not expect to do..." may be interchangeably read as "assumes not to do...."

[0459] In the present disclosure, "expect" may be interchangeably read as "be expected." For example, "expect(s) ..." ("..." may be expressed, for example, as a that clause, a to-infinitive, etc.) may be interchangeably read as "be expected ...." "does not expect ..." may be interchangeably read as "be not expected ...." Furthermore, "An apparatus A is not expected ..." may be interchangeably read as "an apparatus B other than apparatus A does not expect ... from apparatus A" (e.g., if apparatus A is a UE, apparatus B may be a base station).

[0460] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0461] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0462] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0463] 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."

[0464] 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." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0465] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0466] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with "i-th" (i is an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0467] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0468] In the present disclosure, terms such as "when A, B," "if A, (then) B," "B upon A," "B in response to A," "B based on A," "B during / while A," "B before A," "B at (the same time as) / on A," "B after A," "B since A," and "B until A" may be interchangeable. Note that A, B, and the like herein may be replaced with appropriate expressions such as nouns, gerunds, and regular sentences, depending on the context. Note that the time difference between A and B may be approximately zero (immediately after or immediately before). A time offset may also be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after a time offset at which A occurs." The time offset (eg, one or more symbols / slots) may be predefined or may be specified by the UE based on signaled information.

[0469] In the present disclosure, timing, time, duration, time instance, any time unit (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc. may be read interchangeably.

[0470] 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 description of the present disclosure is for illustrative purposes only and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A receiver that receives a plurality of commands indicating a plurality of transmission configuration indicator (TCI) states associated with a plurality of groups of resource sets for monitoring a downlink control channel, and receives one or more pieces of downlink control information in one or more of the plurality of groups respectively; and a controller that controls reception or transmission using one or more of the TCI states among the plurality of TCI states, the one or more TCI states being indicated by the one or more pieces of downlink control information, wherein the plurality of groups are associated with a plurality of cell identifiers, a terminal.

2. The terminal according to claim 1, wherein one of the plurality of groups is associated with one of the plurality of cell identifiers, and the one or more pieces of downlink control information is one piece of downlink control information indicating one TCI state.

3. The terminal according to claim 1, wherein one of the plurality of groups is associated with two or more of the plurality of cell identifiers, and the one or more pieces of downlink control information is one piece of downlink control information indicating one TCI state.

4. The terminal according to claim 1, wherein one of the plurality of groups is associated with two or more of the plurality of cell identifiers, and the one or more pieces of downlink control information is two or more pieces of downlink control information respectively indicating two or more TCI states.

5. A wireless communication method for a terminal, comprising: receiving a plurality of commands indicating a plurality of transmission configuration indicator (TCI) states associated with a plurality of groups of resource sets for monitoring a downlink control channel; receiving one or more pieces of downlink control information in one or more of the plurality of groups respectively; and controlling reception or transmission using one or more of the TCI states among the plurality of TCI states, the one or more TCI states being indicated by the one or more pieces of downlink control information, wherein the plurality of groups are associated with a plurality of cell identifiers.

6. A base station that transmits a plurality of commands indicating a plurality of transmission configuration indicator (TCI) states associated with a plurality of groups of resource sets for monitoring a downlink control channel, and transmits one or more pieces of downlink control information in one or more of the plurality of groups respectively; and a control unit that controls reception or transmission using one or more of the plurality of TCI states, the one or more TCI states being indicated by the one or more pieces of downlink control information, wherein the plurality of groups are associated with a plurality of cell identifiers.

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