Terminal, wireless communication method, base station and system

Abstract

A terminal according to one aspect of the present disclosure has: a reception unit that receives first information indicating a plurality of transmission configuration indication (TCI) states, second information related to the association of a field included in downlink control information (DCI) and indicating a transmission configuration indication (TCI) state with one or more TCI states to be applied to a plurality of kinds of signals, and DCI indicating one or more TCI states among the plurality of TCI states; and a control unit that applies the one or more TCI states to a plurality of kinds of signals on the basis of the first information, the second information, and the TCI-state-indicating field included in the DCI indicating the one or more TCI states. This aspect of the present disclosure makes it possible to suitably perform TCI state indication.

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) 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), it is being considered that user terminals (terminals, user terminals, User Equipment (UE)) will control transmission and reception processing based on information regarding quasi-co-location (QCL) (QCL assumptions / Transmission Configuration Indication (TCI) state / spatial relationship).

[0006] It is being considered to apply the set / activated / indicated TCI state to multiple types of signals (channels / RS). However, there are cases where the method for indicating the TCI state is unclear. If the method for indicating the TCI state is unclear, it may lead to a deterioration in communication quality, a decrease in throughput, etc.

[0007] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately perform a TCI status indication.

[0008] A terminal according to one aspect of the present disclosure has a receiving unit that receives first information indicating a plurality of transmission configuration instruction (TCI) states, second information regarding an association between a field indicating the transmission configuration instruction (TCI) state included in downlink control information (DCI) and one or more TCI states to be applied to a plurality of types of signals, and DCI indicating one or more TCI states among the plurality of TCI states; and a control unit that applies the one or more TCI states to a plurality of types of signals based on the first information, the second information, and the field indicating the TCI state included in the DCI indicating the one or more TCI states.

[0009] According to one aspect of the present disclosure, the TCI status can be appropriately indicated.

[0010] FIG. 1 is a diagram showing an example of simultaneous beam updating across multiple CCs. FIGS. 2A and 2B are diagrams showing an example of a common beam. FIG. 3 is a diagram showing an example of setting / indicating a TCI state by higher layer signaling according to a first embodiment. FIG. 4 is a diagram showing another example of setting / indicating a TCI state by higher layer signaling according to the first embodiment. FIG. 5 is a diagram showing an example of a configuration of an RRC information element related to setting a TCI state according to the first embodiment. FIG. 6 is a diagram showing an example of a configuration of a MAC CE related to setting / indicating a TCI state according to the first embodiment. FIG. 7 is a diagram showing an example of setting / indicating a TCI state by higher layer signaling according to a second embodiment. FIG. 8 is a diagram showing an example of a configuration of an RRC information element related to setting a TCI state according to the second embodiment. FIG. 9 is a diagram showing an example of a configuration of a MAC CE related to setting / indicating a TCI state according to the second embodiment. FIG. 10 is a diagram showing an example of a configuration of a MAC CE according to a modification of the first embodiment and the second embodiment. FIG. 11 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. Fig. 12 is a diagram illustrating an example of the configuration of a base station according to an embodiment. Fig. 13 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. Fig. 14 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal 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 applied to a downlink signal / channel, and the equivalent of the TCI state 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 a Doppler shift, a Doppler spread, an average delay, a delay spread, and a spatial parameter (e.g., a spatial Rx parameter) is the same between these different signals / channels (i.e., the signals / channels have a QCL with respect to at least one of these).

[0015] The spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be 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 (QCL types) of QCL 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. The parameters (which may be referred to as QCL parameters) are as follows: QCL type A (QCL-A): Doppler shift, Doppler spread, mean delay, and delay spread QCL type B (QCL-B): Doppler shift and Doppler spread QCL type C (QCL-C): Doppler shift and mean delay QCL type D (QCL-D): Spatial reception parameters.

[0017] The UE's assumption that a Control Resource Set (CORESET), channel, or reference signal 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] For the PDCCH and PDSCH, the QCL Type A RS is always configured, and the QCL Type D RS may be configured additionally. Since it is difficult to estimate Doppler shift, delay, etc. by one-shot reception of the DMRS, the QCL Type A RS is used to improve the accuracy of channel estimation. The QCL Type D RS is used to determine the receiving beam when receiving the DMRS.

[0026] For example, TRS1-1, 1-2, 1-3, and 1-4 are transmitted, and TRS1-1 is notified as a QCL type C / D RS depending on the TCI status of the PDSCH. By notifying the TCI status, the UE can use information obtained from past periodic reception / measurement results of TRS1-1 for reception / channel estimation of the DMRS for the PDSCH. In this case, the QCL source of the PDSCH is TRS1-1, and the QCL target is the DMRS for the PDSCH.

[0027] (Multi-TRP) In NR, one or more transmission / reception points (TRP) (multi-TRP (MTRP)) are considered to perform DL transmission to a UE using one or more panels (multi-panels). Also, it is considered that a UE performs UL transmission to one or more TRPs using one or more panels.

[0028] Note that multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0029] Multi-TRPs (e.g., TRPs #1 and #2) may be connected by ideal / non-ideal backhauls to exchange information, data, etc. Each TRP of a multi-TRP may transmit a different code word (CW) and a different layer. Non-Coherent Joint Transmission (NCJT) may be used as a form of multi-TRP transmission.

[0030] In the NCJT, for example, TRP#1 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, and TRP#2 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.

[0031] 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.

[0032] 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).

[0033] Multiple PDSCHs from multiple TRPs (which may be referred to as multiple PDSCHs) may be scheduled using one DCI (single DCI, single PDCCH) (single-master mode, single-DCI based multi-TRP). Multiple PDSCHs from multiple TRPs may be scheduled using multiple DCIs (multiple DCI, multiple PDCCHs) (multi-master mode, multi-DCI based multi-TRP).

[0034] 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.

[0035] Such a multi-TRP scenario allows for more flexible transmission control using good quality channels.

[0036] In order to support multi-TRP transmission within a cell (with the same cell ID) and between cells (with different cell IDs) based on multiple PDCCHs, in the RRC configuration information for linking multiple pairs of PDCCHs and PDSCHs with multiple TRPs, one control resource set (CORESET) in the PDCCH configuration information (PDCCH-Config) may correspond to one TRP.

[0037] If at least one of the following conditions 1 and 2 is satisfied, the UE may determine that the transmission is a multi-TRP transmission based on the multi-DCI. In this case, the TRP may be replaced with the CORESET pool index. [Condition 1] A CORESET pool index of 1 is set. [Condition 2] Two different values ​​of the CORESET pool index (e.g., 0 and 1) are set.

[0038] If the following condition is met, the UE may determine that it is a multi-TRP based on a single DCI. In this case, two TRPs may be interpreted as two TCI states indicated by the MAC CE / DCI. [Condition] "Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE" is used to indicate one or two TCI states for one codepoint in the TCI field in the DCI.

[0039] The DCI for common beam instruction may be a UE-specific DCI format (e.g., DL DCI format (e.g., 1_1, 1_2), UL DCI format (e.g., 0_1, 0_2)), or may be a UE-group common DCI format.

[0040] (Simultaneous Beam Update of Multiple CCs) In Rel. 16, one MAC CE can update the beam index (TCI state) of multiple CCs.

[0041] The UE can be configured with up to two applicable CC lists (e.g., applicable-CC-list) by RRC. When two applicable CC lists are configured, the two applicable CC lists may correspond to in-band CA in FR1 and in-band CA in FR2, respectively.

[0042] The PDCCH TCI state activation MAC CE activates the TCI states associated with the same CORESET ID on all BWP / CCs in the applicable CC list.

[0043] Activation of TCI State for PDSCH The MAC CE activates the TCI state on all BWP / CCs in the applicable CC list.

[0044] A-SRS / SP-SRS Spatial Relationship Activation The MAC CE activates the spatial relationships associated with the same SRS resource ID on all BWPs / CCs in the applicable CC list.

[0045] In the example of Figure 1, the UE is configured with an applicable CC list indicating CCs 0, 1, 2, and 3, and a list indicating 64 TCI states for CORESET or PDSCH of each CC. If one TCI state of CC 0 is activated by a MAC CE, the corresponding TCI state is activated in CCs 1, 2, and 3.

[0046] Such simultaneous beam updating is considered applicable only to the single TRP case.

[0047] For PDSCH, the UE may follow the procedure A. [Procedure A] The UE receives an activation command to map up to eight TCI states to codepoints of the DCI field (TCI field) within one CC / DL BWP or within one set of CCs / BWPs. If one set of TCI state IDs is activated for one set of CCs / DL BWPs, then the applicable list of CCs is determined by the CC indicated in the activation command, and the same set of TCI states applies to all DL BWPs within the indicated CCs. Only if the UE is not provided with different values ​​of the CORESETPoolIndex in the CORESET information element (ControlResourceSet) and is not provided with at least one TCI codepoint that maps to two TCI states, can one set of TCI state IDs be activated for one set of CC / DL BWPs.

[0048] For PDCCH, the UE may follow procedure B. [Procedure B] If the UE is provided with up to two lists of cells for simultaneous TCI state activation by the simultaneous TCI cell list (simultaneousTCI-CellList) via the simultaneous TCI update list (at least one of simultaneousTCI-UpdateList-r16 and simultaneousTCI-UpdateListSecond-r16), the UE shall apply antenna port quasi co-location (QCL) provided by TCI states with the same activated TCI state ID value to CORESET with index p in all configured DL BWPs of all configured cells in one list determined from the serving cell index provided by the MAC CE command. A simultaneous TCI cell list can be provided for simultaneous TCI state activation only if the UE is not provided with multiple different values ​​of the CORESETPoolIndex in the CORESET information element (ControlResourceSet) and is not provided with at least one TCI codepoint that maps to two TCI states.

[0049] For semi-persistent (SP) / aperiodic (AP)-SRS, the UE may follow procedure C. [Procedure C] When spatial relation information (spatialRelationInfo) for SP or AP-SRS resources configured by the SRS resource information element (higher layer parameter SRS-Resource) for one set of CCs / BWPs is activated / updated by MAC CE, where the applicable list of CCs is indicated by the simultaneous spatial update list (higher layer parameter simultaneousSpatial-UpdateList-r16 or simultaneousSpatial-UpdateListSecond-r16), the spatial relation information is applied to SP or AP-SRS resources with the same SRS resource ID in all BWPs within the indicated CC. The spatial relation information (spatialRelationInfo) for the SP or AP-SRS resources configured by the SRS resource information element (higher layer parameter SRS-Resource) for one set of CCs / BWPs is activated / updated by the MAC CE only if the UE is not provided with different values ​​of the CORESETPoolIndex in the CORESET information element (ControlResourceSet) and is not provided with at least one TCI codepoint that maps to two TCI states.

[0050] The simultaneous TCI cell list (simultaneousTCI-CellList) and the simultaneous TCI update list (at least one of simultaneousTCI-UpdateList1-r16 and simultaneousTCI-UpdateList2-r16) are lists of serving cells whose TCI relationships can be updated simultaneously using MAC CE. simultaneousTCI-UpdateList1-r16 and simultaneousTCI-UpdateList2-r16 do not include the same serving cell.

[0051] The simultaneous spatial update list (at least one of the upper layer parameters simultaneousSpatial-UpdatedList1-r16 and simultaneousSpatial-UpdatedList2-r16) is a list of serving cells whose spatial relationships can be updated simultaneously using MAC CE. simultaneousSpatial-UpdatedList1-r16 and simultaneousSpatial-UpdatedList2-r16 do not include the same serving cell.

[0052] Here, the simultaneous TCI update list and the simultaneous spatial update list are configured by the RRC, the CORESET pool index of the CORESET is configured by the RRC, and the TCI code point mapped to the TCI state is indicated by the MAC CE.

[0053] (Unified / Common TCI Framework) The unified TCI framework allows UL and DL channels to be controlled by a common framework. Instead of specifying TCI states or spatial relationships for each channel as in Rel. 15, the unified TCI framework may specify a common beam (common TCI state) and apply it to all UL and DL channels, or a common beam for UL may apply to all UL channels and a common beam for DL ​​may apply to all DL channels.

[0054] 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.

[0055] 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).

[0056] 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).

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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).

[0062] 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).

[0063] 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).

[0064] 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).

[0065] 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.

[0066] In the example of Figure 2A, an RRC parameter (information element) configures multiple TCI states for both DL and UL. A MAC CE may activate multiple TCI states from the configured multiple TCI states. A DCI may indicate one of the activated multiple TCI states. The DCI may be a UL / DL DCI. The indicated TCI state may apply to at least one (or all) of the UL / DL channels / RS. One DCI may indicate both UL TCI and DL TCI.

[0067] In the example of FIG. 2A, a point may be one TCI state that applies to both UL and DL, or two TCI states that apply to UL and DL, respectively.

[0068] 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).

[0069] 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."

[0070] In the example of Figure 2B, the RRC parameters configure multiple TCI states (joint common TCI pools) for both DL and UL. The MAC CE may activate multiple TCI states (active TCI pools) from the configured multiple TCI states. Separate active TCI pools for each of the UL and DL may be configured / activated.

[0071] 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.

[0072] The existing DCI formats 1_1 / 1_2 may be used to indicate the common TCI state.

[0073] A common TCI framework may have separate TCI states for DL ​​and UL.

[0074] (Analysis) As mentioned above, in the unified TCI framework, the common / unified TCI state can be set / indicated / updated by the DCI.

[0075] In Rel. 17 and later, it is being considered that the DCI will be in at least one of the following formats: a DCI format with DL assignment including an existing TCI field (which may be referred to as a TCI status field) (defined up to Rel. 15 / 16), a DCI format without DL assignment including an existing TCI field, a DCI format without DL assignment including a new TCI field (defined in Rel. 17 and later), and a new DCI format including a new TCI field.

[0076] In the present disclosure, a DCI (DCI format) that does not indicate scheduling of either the PDSCH or the PUSCH, a DCI (DCI format) that does not indicate scheduling of the PDSCH, a DCI (DCI format) without a DL assignment, a DCI (DCI format) that is a DCI format for DL ​​assignment and does not schedule the PDSCH, a DCI (DCI format) that has a field for DL ​​assignment and does not schedule the PDSCH, and a DCI (DCI format) that includes a TCI field and does not schedule the PDSCH may be interchangeable. The DCI format with / without a DL assignment may be, for example, DCI format 1_1 / 1_2. The new DCI format may be represented by DCI format X_Y (X and Y are arbitrary numbers). Furthermore, the new TCI field may be a field that reuses an unused field from among the existing fields used for scheduling the PDSCH, or may be a field not specified in Rel. 15 / 16.

[0077] For example, it is being considered to use the TCI status field included in DCI format 1_1 / 1_2 with DL assignment to indicate / update the UL and DL TCI status (joint TCI status) and the DL TCI status to the UE.

[0078] Furthermore, for example, it is being considered to use a TCI status field included in DCI format 1_1 / 1_2 without DL assignment to indicate / update at least one of a TCI status common to UL and DL (joint TCI status) and a DL TCI status to a UE, and to use a new field included in DCI format 1_1 / 1_2 without DL assignment to indicate / update at least one of a UL TCI status and a DL TCI status to a UE. It is being considered to reuse an unused field included in DCI format 1_1 / 1_2 without DL assignment for the new field.

[0079] However, when indicating the UL / DL TCI status using DCI as described above, there is insufficient consideration as to how to notify the UE of the TCI status corresponding to the code point indicated by the TCI status field included in the DCI. If this consideration is insufficient, the TCI status cannot be indicated appropriately, which may result in degradation of communication quality, throughput, etc.

[0080] Therefore, the present inventors came up with a method for setting the TCI state when specifying a unified / common TCI.

[0081] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0082] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read as interchangeable. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as interchangeable. In the present disclosure, index, ID, indicator, and resource ID may be read as interchangeable. In the present disclosure, support, control, controllable, operate, and operable may be read as interchangeable.

[0083] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read interchangeably.

[0084] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, higher layer, higher layer parameters, RRC information elements (IEs), and RRC messages may be read interchangeably.

[0085] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0086] In the present disclosure, MAC CE and activation / deactivation command may be read interchangeably.

[0087] In the present disclosure, the terms pool, set, group, list, and candidate may be read interchangeably.

[0088] In the present disclosure, DMRS, DMRS port, and antenna port may be read interchangeably.

[0089] In the present disclosure, the terms special cell, SpCell, PCell, and PSCell may be read interchangeably.

[0090] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameter, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS of QCL type D for TCI state / QCL assumption, RS of QCL type A for TCI state / QCL assumption, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, and PL-RS may be read interchangeably. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS having QCL type X, source of DL-RS, SSB, CSI-RS, and SRS may be read interchangeably.

[0091] In the present disclosure, common beam, common TCI, common TCI state, unified TCI, unified TCI state, TCI state applicable to DL and UL, TCI state applicable to multiple (multiple types) channels / RS, TCI state applicable to multiple types of channels / RS, and PL-RS may be read interchangeably.

[0092] In the present disclosure, multiple TCI states configured by RRC, multiple TCI states activated by MAC CE, pool, TCI state pool, active TCI state pool, common TCI state pool, joint TCI state pool, separate TCI state pool, common TCI state pool for UL, common TCI state pool for DL, common TCI state pool configured / activated by RRC / MAC CE, and TCI state information may be read interchangeably.

[0093] In the present disclosure, panel, Uplink (UL) transmitting entity, TRP, spatial relationship, control resource set (CONTROLLER RESOLUTION SET (CORESET)), PDSCH, codeword, base station, antenna port of a certain signal (e.g., Demodulation Reference Signal (DMRS) port), antenna port group of a certain signal (e.g., DMRS port group), group for multiplexing (e.g., Code Division Multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CORESET subset, CW, redundancy version (RV), layer (MIMO layer, transmission layer, spatial layer) may be interchangeable. Also, panel identifier (ID) and panel may be interchangeable. In the present disclosure, the terms TRP ID, TRP Associated ID, CORESET Pool Index, the position of one of two TCI states corresponding to one code point of a field in a DCI (ordinal number, first TCI state or second TCI state), and TRP may be read interchangeably.

[0094] In the present disclosure, the terms TRP, transmission point, panel, DMRS port group, CORESET pool, and one of two TCI states associated with one code point in the TCI field may be read interchangeably.

[0095] In this disclosure, the terms "single TRP," "single TRP system," "single TRP transmission," and "single PDSCH" may be interchangeable. In this disclosure, the terms "multiple TRP," "multiple TRP system," "multiple TRP transmission," and "multiple PDSCH" may be interchangeable. In this disclosure, the terms "single DCI," "single PDCCH," "multiple TRP based on a single DCI," and "activating two TCI states on at least one TCI codepoint" may be interchangeable.

[0096] In the present disclosure, single TRP, channel using single TRP, channel using one TCI state / spatial relationship, multi-TRP not enabled by RRC / DCI, multiple TCI states / spatial relationships not enabled by RRC / DCI, a CORESETPoolIndex value of 1 not set for any CORESET, and no code point in the TCI field mapped to two TCI states may be read interchangeably.

[0097] In the present disclosure, "multi-TRP," "channel using multi-TRP," "channel using multiple TCI states / spatial relationships," "multi-TRP being enabled by RRC / DCI," "multiple TCI states / spatial relationships being enabled by RRC / DCI," and "at least one of multi-TRP based on a single DCI" and "multi-TRP based on multiple DCI" may be interchangeable. In the present disclosure, "multi-TRP based on multiple DCI," and "setting a CORESET pool index (CORESETPoolIndex) value of 1 for the CORESET" may be interchangeable. In the present disclosure, "multi-TRP based on a single DCI," and "at least one code point in the TCI field is mapped to two TCI states" may be interchangeable.

[0098] In the present disclosure, TRP#1 (first TRP) may correspond to CORESET pool index = 0 or may correspond to the first of two TCI states corresponding to one code point in the TCI field, and TRP#2 (second TRP) may correspond to CORESET pool index = 1 or may correspond to the second of two TCI states corresponding to one code point in the TCI field.

[0099] In the present disclosure, CORESET0, CORESET with index 0, and common CORESET may be read interchangeably.

[0100] (Wireless communication method) In the present disclosure, DL TCI, DL only TCI, DL common TCI, DL unified TCI, common TCI, and unified TCI may be interchangeable. In the present disclosure, UL TCI, UL only TCI, UL common TCI, UL unified TCI, common TCI, and unified TCI may be interchangeable.

[0101] In the present disclosure, in the case of a joint TCI pool, "when a joint TCI pool is configured" and "when a separate TCI pool is configured" may be read interchangeably.

[0102] In the present disclosure, the following terms may be read interchangeably: a joint TCI pool is configured; a TCI pool configured for DL ​​and a TCI pool configured for UL are common; a TCI pool for both DL and UL is configured; and one TCI pool (one set of TCIs) is configured.

[0103] In the present disclosure, the following terms may be interchangeable: a separate TCI pool is configured; a TCI pool configured for DL ​​and a TCI pool configured for UL are different; a TCI pool for DL ​​(first TCI pool, first TCI set) and a TCI pool for UL (second TCI pool, second TCI set) are configured; a plurality of TCI pools (a plurality of sets of TCIs) are configured; and a TCI pool for DL ​​is configured. When a TCI pool for DL ​​is configured, the TCI pool for UL may be equal to the configured TCI pool.

[0104] In the present disclosure, the channels / RS to which the common TCI is applied may be PDSCH / HARQ-ACK information / PUCCH / PUSCH / CSI-RS / SRS.

[0105] In each embodiment of the present disclosure, a pool (list) including multiple unified TCI states may be configured / activated for a UE, and one or more of the multiple unified TCI states may be indicated. The configuration / activation may be performed by configuration information transmitted via higher layer signaling (e.g., RRC signaling / MAC CE), or the indication may be performed by indication information transmitted using DCI.

[0106] In addition, in the present disclosure, signaling configuration, signaling, setting, configuration, setting information, instruction, instruction information, etc. may be read interchangeably.

[0107] In the present disclosure, BFR, BFR setting, BFR procedure, BFD, BFD procedure, BFD-RS, BFD-RS setting, RLM, RLM setting, RLM procedure, RLM-RS, and RLM-RS setting may be interchangeable. In the present disclosure, per cell BFR, cell-specific BFR, and BFR in Rel. 15 / 16 may be interchangeable. In the present disclosure, per TRP BFR, TRP-specific BFR, and BFR in Rel. 17 / Rel. 17 and later may be interchangeable.

[0108] <First embodiment> A UE may be instructed of at least one (or at least two) of a DL TCI state, a UL TCI state, and a TCI state common to UL and DL, using at least one of an existing DCI format (e.g., DCI format 1_1 / 1_2 with DL assignment) and a new DCI format (e.g., DCI format 1_1 / 1_2 without DL assignment).

[0109] At least one of the DL TCI state, the UL TCI state, and the UL and DL common TCI state may be indicated to the UE in a common DCI field (eg, a TCI state (TCI) field).

[0110] At least one of the DL TCI state, the UL TCI state, and the UL and DL common TCI state indicated by the code point of the TCI field included in the DCI may be configured / indicated to the UE using higher layer signaling (RRC / MAC CE).

[0111] 3 is a diagram showing an example of setting / indicating a TCI state by higher layer signaling according to the first embodiment. As shown in the example of FIG. 3, an association (e.g., a table / list / pool) between a code point indicated by the TCI field of DCI and a TCI state is set / indicated to a UE using higher layer signaling (e.g., RRC signaling / MAC CE). The UE may determine a TCI state to apply to at least one of a DL signal / channel and a UL signal / channel based on the association and the code point of the TCI state field included in the DCI.

[0112] As shown in the example of Figure 3, the TCI state list / pool configured / signaled by higher layer signaling may be common to the joint TCI state and the separate TCI state. That is, the TCI state list / pool configured / signaled by higher layer signaling may include one or more TCI states for indicating the joint TCI state and one or more TCI states for indicating the separate TCI state. As shown in Figure 3, it is possible to distinguish between the indication of the joint TCI state and the indication of the separate TCI state by different code points.

[0113] As shown in the example of FIG. 3, the joint TCI state and the separate TCI state may have different TCI states (TCI state IDs).

[0114] A TCI state corresponding to a joint TCI state (e.g., TCI states #0 / #1 / #2 / #3 in FIG. 3 ) may include information related to UL and DL (e.g., parameters related to transmit power control (TPC)), while a DL TCI state corresponding to a separate TCI state (e.g., TCI states #4 / #6 / #8 / #10 in FIG. 3 ) may include only information related to DL (e.g., parameters related to TPC).

[0115] Fig. 4 is a diagram showing another example of setting / indicating the TCI state by higher layer signaling according to the first embodiment. Fig. 4 differs from the above-mentioned Fig. 3 in that the association between the code point of the TCI field and the TCI state does not distinguish between the joint TCI state and the separate TCI state.

[0116] For example, when one TCI state (TCI state #0 / #1 / #2 / #3 in FIG. 4) is instructed, the UE may determine that a joint TCI state is instructed. Also, when two TCI states are instructed, the UE may determine that a separate TCI state is instructed. In this case, the UE may determine that a TCI state with a larger (or smaller) TCI state ID is a DL TCI state, and that a TCI state with a smaller (or larger) TCI state ID is a UL TCI state.

[0117] Note that the diagram showing the association between the code points of the TCI field and the TCI states in the present disclosure is merely an example, and the number of bits of the code points of the TCI field, the number of TCI state IDs, etc. are not limited to these.

[0118] 5 is a diagram showing an example of a configuration of an RRC information element related to setting a TCI state according to the first embodiment. In the first embodiment, the RRC information element for setting a TCI state (unified / common TCI state) may have the configuration shown in FIG. 5.

[0119] As shown in the example of Figure 5, the unified / common TCI list may include a maximum of 128 common / unified TCI states. Note that the maximum number of common / unified TCI states included in the unified / common TCI list is not limited to 128, and may be any number (e.g., 64).

[0120] As shown in the example of Figure 5, the parameter related to the unified / common TCI state (Unified TCI state) may include a unified / common TCI state ID. The unified / common TCI state ID may be numbered in the order of the TCI state common to DL and UL (joint TCI state), the DL TCI state, and the UL TCI state. Alternatively, the unified / common TCI state ID may be numbered in the order of the TCI state common to DL and UL (joint TCI state), the UL TCI state, and the DL TCI state.

[0121] As shown in the example of Fig. 5, for a certain unified / common TCI state ID, any one of a parameter of a DL and UL common TCI state (joint TCI state) (DL / UL joint TCI), a parameter of a DL TCI state (DL TCI), or a parameter of a UL TCI state (UL TCI) may be selectively set (CHOICE). The parameter of the DL and UL common TCI state (DL / UL joint TCI), the DL TCI state (DL TCI), and the UL TCI state (UL TCI) may include any parameter (simply indicated as "parameter" in Fig. 5).

[0122] Fig. 6 is a diagram showing an example of the configuration of a MAC CE related to setting / indicating a TCI state according to the first embodiment. In the first embodiment, a MAC CE for setting / indicating a TCI state (unified / common TCI state) may have the configuration shown in Fig. 6. In the MAC CE shown in Fig. 6, a code point in the TCI field of DCI may be associated with the TCI state.

[0123] As shown in the example of FIG. 6, the MAC CE for setting / indicating the TCI state (unified / common TCI state) includes a bit field indicating the serving cell ID (described as Serving Cell ID), a bit field indicating the BWP ID (described as BWP ID), and a bit field indicating the TCI state ID (TCI state ID i,j (i is an integer from 0 to N, j is 1 or 2), and a bit field (C i and a reserved bit (denoted as R).

[0124] In the example of Figure 6, the MAC CE for setting / indicating the TCI state (uniform / common TCI state) consists of M octets, where "i" may correspond to the index of the codepoint of the TCI state field indicated by the DCI. i,j " may indicate the j-th TCI state of the code point in the i-th TCI state field. For example, in the association shown in Figure 4 above, the first TCI state corresponding to code point 100 is TCI state #4, and the second TCI state is TCI state #5.

[0125] In the example of Figure 6, when a bit field indicating the number of TCI states indicates a first value (e.g., 0), it may indicate that the TCI state corresponding to the bit field (in the same row) is one TCI state (e.g., a TCI state common to UL and DL (joint TCI state)).Also, when a bit field indicating the number of TCI states indicates a second value (e.g., 1), it may indicate that the TCI states corresponding to the bit field (in the same row and the row immediately below) are two TCI states (e.g., a DL TCI state and a UL TCI state (separate TCI state)).

[0126] According to the first embodiment described above, it is possible to appropriately set / indicate the association between the code point in the TCI field and the TCI state using higher layer signaling.

[0127] Second Embodiment The second embodiment differs from the first embodiment in that the TCI state list / pool configured / notified to the UE differs between the joint TCI state, the DL TCI state, and the ULTCI state.

[0128] 7 is a diagram showing an example of setting / indicating a TCI state by higher layer signaling according to the second embodiment. As shown in the example of FIG. 7, an association (e.g., a table / list / pool) between a code point indicated by the TCI field of DCI and a TCI state is set / indicated to a UE using higher layer signaling (e.g., RRC signaling / MAC CE). The UE may determine a TCI state to apply to at least one of a DL signal / channel and a UL signal / channel based on the association and the code point of the TCI state field included in the DCI.

[0129] As shown in the example of Figure 7, a TCI state list / pool may be configured in a higher layer for each of the joint TCI state, the DL TCI state, and the UL TCI state. As shown in the example of Figure 7, TCI state candidates for each of the joint TCI state and the separate TCI state may include a common (same) TCI state ID. TCI states corresponding to the same TCI state ID in the joint TCI state, the DL TCI state, and the UL TCI state may be different TCI states.

[0130] In the example of Figure 7, for example, when a UE is notified of code point 000 in the TCI field included in the DCI, the UE selects a TCI state corresponding to TCI state #0 from the joint TCI state list / pool and applies it to UL transmission / DL reception. Also, for example, when a UE is notified of code point 100 in the TCI field included in the DCI, the UE selects a TCI state corresponding to TCI state #0 from the DL TCI state list / pool and applies it to DL reception, and selects a TCI state corresponding to TCI state #0 from the UL TCI state list / pool and applies it to UL transmission.

[0131] A TCI state corresponding to a joint TCI state may include information about UL and DL (e.g., parameters related to transmit power control (TPC)), and a DL TCI state corresponding to a separate TCI state may include information only about DL (e.g., parameters related to TPC).

[0132] Fig. 8 is a diagram showing an example of the configuration of an RRC information element related to setting of a TCI state according to the second embodiment. In the second embodiment, the RRC information element for setting the TCI state (unified / common TCI state) may have the configuration shown in Fig. 8.

[0133] As shown in the example of Figure 8, the parameter related to the unified / common TCI state (Unified TCI state) may include at least one of a parameter of a DL / UL joint TCI state list, a parameter of a DL TCI state list, and a parameter of a UL TCI state list. The parameter of the DL / UL joint TCI list, the parameter of the DL TCI state list, and the parameter of the UL TCI state list may each include parameters of up to 128 TCI states. Note that the maximum number of TCI states included in each TCI state list is not limited to 128 and may be any number (e.g., 64).

[0134] As shown in the example of FIG. 8 , the parameters of each TCI state (DL / UL joint TCI / DL TCI / UL TCI) may include parameters indicating a TCI state ID (DL / UL joint TCI state ID / DL TCI state ID / UL TCI state ID) and an optional parameter (simply referred to as “parameter” in FIG. 8 ).

[0135] Fig. 9 is a diagram showing an example of the configuration of a MAC CE related to setting / indicating a TCI state according to the second embodiment. In the second embodiment, a MAC CE for setting / indicating a TCI state (unified / common TCI state) may have a configuration as shown in Fig. 9. In the MAC CE as shown in Fig. 9, a code point in the TCI field of DCI may be associated with the TCI state.

[0136] As shown in the example of FIG. 9 , the MAC CE for setting / indicating the TCI state (unified / common TCI state) includes a bit field indicating the serving cell ID (described as Serving Cell ID), a bit field indicating the BWP ID (described as BWP ID), and a bit field indicating the TCI state ID (TCI state ID i,j (i is an integer from 0 to N, j is 1 or 2), and a bit field (C i ), a bit field to indicate the UL TCI status (P i and a reserved bit (denoted as R).

[0137] In the example of Figure 9, the MAC CE for setting / indicating the TCI state (uniform / common TCI state) consists of M octets, where "i" may correspond to the index of the codepoint of the TCI state field indicated by the DCI. i,j " may indicate the j-th TCI state of the codepoint in the i-th TCI state field.

[0138] In the example of FIG. 9, a bit field (C i ) indicates a first value (e.g., 0), it may indicate that the corresponding TCI state is one TCI state (e.g., a TCI state common to UL and DL (joint TCI state)).

[0139] Also, when the bit field indicating the number of TCI states indicates a second value (for example, 1), it may indicate that the corresponding TCI state (in the same row) is a TCI state ID of a DL TCI state. i ) may be set to indicate that the TCI state corresponding to that bit field (in the same row) is a TCI state ID of a UL TCI state.

[0140] In the MAC CE of the first embodiment, a total of X TCI state IDs (128 in the above example) can be set in the settings of the DL and UL common TCI state, the DL TCI state, and the UL TCI state, whereas in the second embodiment, X TCI state IDs (i.e., a total of 3X) can be set in each of the settings of the DL and UL common TCI state, the DL TCI state, and the UL TCI state. Since the second embodiment allows more TCI state IDs to be set than the first embodiment and has the same MAC CE signaling overhead as the first embodiment, operation of the MAC CE of the second embodiment is preferable. Note that, as described above, 128 described as the number (maximum number) of TCI state IDs is merely an example and is not limited to this.

[0141] According to the second embodiment described above, it is possible to appropriately set / indicate the association between the code point in the TCI field and the TCI state using higher layer signaling.

[0142] <Modifications of First and Second Embodiments> At least one of the MAC CE related to setting / indicating the common TCI state described in the first embodiment and the MAC CE related to setting / indicating the common TCI state described in the second embodiment may be a MAC CE specified in Rel. 17 or later, or may be an "Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE" specified in Rel. 16.

[0143] In order for the UE to distinguish between a UE-specific MAC CE for PDSCH extended TCI state activation / deactivation (which may be referred to as a first MAC CE) and a MAC CE for setting / indicating a common TCI state (which may be referred to as a second MAC CE), which are specified in Rel. 16, an ID for distinguishing between the first MAC CE and the second MAC CE may be set in the MAC PDU.

[0144] Furthermore, the UE may determine / distinguish based on a specific bit field included in the MAC CE whether the notified MAC CE is the first MAC CE described in the first embodiment or the MAC CE described in the second embodiment. Furthermore, the UE may determine / distinguish based on a specific bit field included in the MAC CE whether the notified MAC CE is the first MAC CE described in the first embodiment, the MAC CE described in the second embodiment, or the second MAC CE.

[0145] 10 is a diagram showing an example of the configuration of a MAC CE according to the first embodiment and the modified example of the second embodiment. In the example shown in FIG. 10, a MAC CE includes a specific bit field (denoted as T) for determining the purpose of the MAC CE. Based on the value of the specific bit field, the UE determines / distinguishes whether the MAC CE is the first MAC CE described in the first embodiment or the MAC CE described in the second embodiment. Based on the specific bit field, the UE also determines / distinguishes whether the MAC CE is the first MAC CE described in the first embodiment, the MAC CE described in the second embodiment, or the second MAC CE.

[0146] The position / size / name etc. of the specific bit field shown in FIG. 10 are merely an example and are not limited to this.

[0147] As described above, according to this embodiment, it is possible to appropriately distinguish between the existing MAC CE (defined up to Rel. 16) and the MAC CE for setting / indicating the common TCI state defined in Rel. 17 and later.

[0148] <Third Embodiment> A higher layer parameter (RRC IE) / UE capability corresponding to a function (feature) in at least one of the above embodiments may be defined. The UE capability may indicate that the function is supported.

[0149] A UE configured with higher layer parameters corresponding to the function (enabling the function) may perform the function. It may also be specified that "a UE not configured with higher layer parameters corresponding to the function shall not perform the function (for example, in accordance with Rel. 15 / 16)."

[0150] A UE that reports a UE capability indicating that it supports the function may perform the function. It may also be specified that a UE that does not report a UE capability indicating that it supports the function shall not perform the function (e.g., in accordance with Rel. 15 / 16).

[0151] If the UE reports a UE capability indicating that it supports the function and the corresponding higher layer parameters are configured, the UE may perform the function. It may also be specified that "if the UE does not report a UE capability indicating that it supports the function or if the corresponding higher layer parameters are not configured, the UE shall not perform the function (e.g., in accordance with Rel. 15 / 16)."

[0152] The UE capability may indicate whether the UE supports this feature.

[0153] The functionality may be a unified TCI state framework.

[0154] UE capability may be defined as whether it supports at least one of the following: a unified TCI state framework, joint / separate TCI pools, and joint / separate beam direction.

[0155] The UE capability may be defined by the number of TCI states configured by the RRC for common beam indication that the UE supports. The common beam indication may be interchangeably read as a separate beam indication for the UL and a separate beam indication for the DL. Furthermore, the common beam indication may be interchangeably read as at least one of a common beam indication, a separate beam indication for the UL, and a separate beam indication for the DL.

[0156] The UE capability may be defined by the number of active TCI states for common beam indication that the UE supports. Common beam indication may be interchangeably read as UL separate beam indication or DL ​​separate beam indication. Also, common beam indication may be interchangeably read as at least one of common beam indication, UL separate beam indication, and DL separate beam indication.

[0157] The UE capability may be defined as at least one of N and M (the number N of TCI states applied to UL channels / RS (UL TCI states) and the number M of TCI states applied to DL channels / RS (DL TCI states)) that the UE supports.

[0158] UE capability may be defined by whether the TCI state is indicated by the DCI, for example, UE capability may be defined by whether the UE supports indicating the common TCI state in at least one of the new DCI format and the DCI format without DL assignment (DCI format 1_1 / 1_2).

[0159] UE capability may be defined as whether one of the joint TCI state or the separate TCI state can be indicated by one DCI codepoint DCI. The DCI codepoint may be a codepoint of an existing TCI field included in the DCI or a codepoint of a new field. UE capability may be defined as whether the UE supports dynamic switching / switching / updating of the indication of the joint TCI state and the indication of the separate TCI state.

[0160] The UE capability may be defined as whether or not the UE supports the MAC CE described in the first and second embodiments.

[0161] According to the third embodiment, the UE can achieve the above functions while maintaining compatibility with existing specifications.

[0162] (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.

[0163] 11 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0164] 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.

[0165] 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.

[0166] 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))).

[0167] 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.

[0168] 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).

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0174] 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).

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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).

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] 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.

[0187] 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).

[0188] (Base Station) Fig. 12 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0201] 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.

[0202] 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.

[0203] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0204] 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.

[0205] The transceiver 120 may transmit first information indicating a plurality of transmission configuration indication (TCI) states, second information regarding associations between a field indicating the transmission configuration indication (TCI) state included in downlink control information (DCI) and one or more TCI states to be applied to a plurality of types of signals, and DCI indicating one or more TCI states among the plurality of TCI states. The control unit 110 may apply the one or more TCI states to a plurality of types of signals based on the first information, the second information, and the field indicating the TCI state included in the DCI indicating the one or more TCI states (first and second embodiments).

[0206] (User Terminal) Fig. 13 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.

[0207] 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.

[0208] 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.

[0209] 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.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 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.

[0216] 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.

[0217] 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.

[0218] 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.

[0219] 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.

[0220] 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.

[0221] 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.

[0222] 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, the transmitting / receiving antenna 230, and the transmission path interface 240.

[0223] The transceiver 220 may receive first information indicating a plurality of transmission configuration indication (TCI) states, second information regarding associations between a field indicating the transmission configuration indication (TCI) state included in downlink control information (DCI) and one or more TCI states to be applied to a plurality of types of signals, and DCI indicating one or more TCI states among the plurality of TCI states. The control unit 210 may apply the one or more TCI states to a plurality of types of signals based on the first information, the second information, and the field indicating the TCI state included in the DCI indicating the one or more TCI states (first and second embodiments).

[0224] The first information may be a list of a plurality of TCI states, and the second information may be at least one of Radio Resource Control (RRC) signaling and Medium Access Control (MAC) control elements (first and second embodiments).

[0225] The first information may be set commonly for an indication of a TCI state common to uplink and downlink, an indication of a TCI state only for downlink, and an indication of a TCI state only for uplink (first embodiment).Alternatively, the first information may be set separately for each of an indication of a TCI state common to uplink and downlink, an indication of a TCI state only for downlink, and a TCI state only for uplink (second embodiment).

[0226] The DCI indicating one or more TCI states may be a DCI indicating neither scheduling of the physical downlink shared channel nor scheduling of the physical uplink shared channel (first and second embodiments).

[0227] (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.

[0228] 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.

[0229] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 14 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.

[0230] 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.

[0231] 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.

[0232] 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.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] 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.

[0237] 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.

[0238] 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).

[0239] 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.

[0240] 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.

[0241] (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.

[0242] 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.

[0243] 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.

[0244] 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.

[0245] 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.

[0246] 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.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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."

[0260] 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.

[0261] 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.

[0262] 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.

[0263] 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.

[0264] 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.

[0265] 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.

[0266] 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.

[0267] 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).

[0268] 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).

[0269] 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).

[0270] 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.

[0271] 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.

[0272] 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).

[0273] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0274] 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.

[0275] 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.

[0276] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0277] 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.

[0278] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may 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.

[0279] 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.

[0280] 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.

[0281] 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.

[0282] 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.

[0283] 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) (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 The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on these and are extended thereto. In addition, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0284] 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."

[0285] 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.

[0286] 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.

[0287] 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.

[0288] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "deciding" some action.

[0289] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0290] 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.

[0291] 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."

[0292] 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.

[0293] 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."

[0294] 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.

[0295] 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.

[0296] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

[0297] This application is based on Japanese Patent Application No. 2021-069906, filed on April 16, 2021, the contents of which are incorporated herein in their entirety.

Claims

1. A receiver for receiving downlink control information (DCI) and a Medium Access Control (MAC) control element including a field indicating the number of Transmission Configuration Indication (TCI) states corresponding to one code point of a TCI field included in the DCI; A terminal having a control unit that determines that the number of TCI states is one when the field included in the MAC control element indicates a first value, and determines that the number of TCI states is two when the field included in the MAC control element indicates a second value.

2. The terminal of claim 1 , wherein, when the field included in the MAC control element indicates the second value, the one code point corresponds to both a downlink TCI state and an uplink TCI state.

3. A method for receiving downlink control information (DCI) and a Medium Access Control (MAC) control element including a field indicating a number of Transmission Configuration Indication (TCI) states corresponding to one code point of a TCI field included in the DCI; determining that the number of TCI states is one when the field included in the MAC control element indicates a first value, and determining that the number of TCI states is two when the field included in the MAC control element indicates a second value.

4. A transmitter for transmitting downlink control information (DCI) and a Medium Access Control (MAC) control element including a field indicating the number of TCI states corresponding to one code point of a Transmission Configuration Indication (TCI) field included in the DCI; A base station having a control unit that indicates that the number of TCI states is one when the field included in the MAC control element indicates a first value, and that indicates that the number of TCI states is two when the field included in the MAC control element indicates a second value.

5. A system having a base station and a terminal, The base station, A transmitter that transmits Downlink Control Information (DCI) and a Medium Access Control (MAC) control element including a field indicating the number of TCI states corresponding to one code point of a Transmission Configuration Indication (TCI) field included in the DCI, The terminal includes: a receiving unit for receiving the MAC control element and the DCI; A control unit that determines that the number of TCI states is one when the field included in the MAC control element indicates a first value, and determines that the number of TCI states is two when the field included in the MAC control element indicates a second value.