Terminals, wireless communication methods, base stations and systems

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

[Technical Field]

[0001] This disclosure relates to terminals and wireless communication methods in next-generation mobile communication systems. 、 base station and system Regarding. [Background technology]

[0002] Long Term Evolution (LTE) was specified for Universal Mobile Telecommunications System (UMTS) networks with the aim of achieving even higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel.10-14) was specified for the aim of further increasing capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

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

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 [Overview of the project] [Problems that the invention aims to solve]

[0005] In future wireless communication systems (e.g., NR), it is being considered that 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 relationships).

[0006] The application of configured / activated / instructed TCI states to multiple types of signals (channel / RS) is being considered. However, there are cases where the method for instructing TCI states is unclear. If the method for instructing TCI states is unclear, it may lead to a decrease in communication quality, throughput, and other problems.

[0007] Therefore, this disclosure relates to a terminal that appropriately performs TCI status indication and a wireless communication method. 、 base station and system One of the objectives is to provide [this]. [Means for solving the problem]

[0008] A terminal according to one aspect of this disclosure includes: a receiving unit that receives downlink control information (DCI) and a Medium Access Control (MAC) control element that includes a field indicating the number of TCI states corresponding to one code point of a Transmission Configuration Indication (TCI) field included in the DCI; and a control unit that determines that the number of TCI states is 1 when the field included in the MAC control element shows a first value, and determines that the number of TCI states is 2 when the field included in the MAC control element shows a second value. Furthermore, if the field included in the MAC control element indicates the second value, the single code point corresponds to both the downlink TCI state and the uplink TCI state, and if the field included in the MAC control element indicates the second value, the MAC control element includes a field indicating that the TCI state of the TCI state ID field in the same octet is the uplink TCI state. . [Effects of the Invention]

[0009] According to one aspect of this disclosure, TCI status indication can be performed appropriately. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 shows an example of simultaneous beam renewal across multiple CCs. [Figure 2] Figures 2A and 2B show an example of a common beam. [Figure 3] Figure 3 shows an example of setting / instructing the TCI state by upper-layer signaling according to the first embodiment. [Figure 4] Figure 4 shows another example of setting / indicating the TCI state by upper-layer signaling according to the first embodiment. [Figure 5] Figure 5 shows an example of the configuration of RRC information elements related to setting the TCI state according to the first embodiment. [Figure 6] Figure 6 shows an example of the MAC CE configuration for setting / instructing the TCI state according to the first embodiment. [Figure 7] Figure 7 shows an example of setting / instructing the TCI state by upper-layer signaling according to the second embodiment. [Figure 8] Figure 8 shows an example of the configuration of RRC information elements related to setting the TCI state according to the second embodiment. [Figure 9] Figure 9 shows an example of the MAC CE configuration for setting / instructing the TCI state according to the second embodiment. [Figure 10] Figure 10 shows an example of the configuration of MAC CE according to a modification of the first and second embodiments. [Figure 11] Figure 11 shows an example of a schematic configuration of a wireless communication system according to one embodiment. [Figure 12] Figure 12 shows an example of the configuration of a base station according to one embodiment. [Figure 13] Figure 13 shows an example of the configuration of a user terminal according to one embodiment. [Figure 14] FIG. 14 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment.

Embodiment for Carrying Out the Invention

[0011] (TCI, Spatial Relation, QCL) In NR, it has been studied to control at least one of reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) in a UE for at least one of a signal and a channel (expressed as a signal / channel) based on a Transmission Configuration Indication state (TCI state).

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

[0013] The TCI state is information regarding Quasi-Co-Location (QCL) of a signal / channel and may be called a spatial reception parameter, Spatial Relation Information, etc. The TCI state may be set for a UE for each channel or each signal.

[0014] QCL is an index that indicates the statistical properties of a signal / channel. For example, if two signals / channels have a QCL relationship, it may mean that we can assume that at least one of the following is identical between these different signals / channels: Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter).

[0015] The spatial reception parameters may correspond to the UE's received beam (e.g., the received analog beam), and the beam may be identified based on the spatial QCL. In this disclosure, QCL (or at least one element of QCL) may be interpreted as sQCL (spatial QCL).

[0016] QCL may have multiple types (QCL types). For example, there may be four QCL types A and D that differ in the parameters (or parameter sets) that can be assumed to be the same, and these parameters (which may also be called QCL parameters) are shown below: • 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 assumption by the UE that one control resource set (CORESET), channel, or reference signal is in a specific QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be called a QCL assumption.

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

[0019] The TCI state may, for example, be information regarding the QCL between the target channel (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 upper-layer signaling, physical layer signaling, or a combination thereof.

[0020] Physical layer signaling may include, for example, Downlink Control Information (DCI).

[0021] The channel on which the TCI state or spatial relationship is set (specified) may be, for example, at least one of the following: Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), Physical Uplink Shared Channel (PUSCH), or Physical Uplink Control Channel (PUCCH).

[0022] Furthermore, the RS that has a QCL relationship with the channel may be at least one of the following: 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)), or a QCL detection reference signal (also called a QRS).

[0023] An SSB is a signal block that includes 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 called an SS / PBCH block.

[0024] The RS of a QCL type X in a TCI state may also mean the RS in the relationship between a channel / signal (or its DMRS) and a QCL type X, and this RS may also be called the QCL source of the QCL type X in that TCI state.

[0025] QCL type A RS is always set for PDCCH and PDSCH, and QCL type D RS may be set additionally. Because it is difficult to estimate Doppler shift, delay, etc. from a single shot of DMRS reception, QCL type A RS is used to improve channel estimation accuracy. QCL type D RS is used for receiving beam determination when DMRS is received.

[0026] For example, TRS1-1, 1-2, 1-3, and 1-4 are transmitted, and TRS1-1 is advertised as QCL type C / D RS by the PDSCH's TCI state. By advertising the TCI state, the UE can use information obtained from past periodic TRS1-1 reception / measurement results to receive / channel estimate the DMRS for the PDSCH. In this case, the PDSCH's QCL source is TRS1-1, and the QCL target is the DMRS for the PDSCH.

[0027] (Multi-TRP) In NR, it is being considered that one or more transmission / reception points (TRPs) (multi-TRPs (MTRPs)) will use one or more panels (multi-panels) to perform DL transmission to the UE. Furthermore, it is being considered that the UE will use one or more panels to perform UL transmission to one or more TRPs.

[0028] Multiple TRPs may correspond to the same cell identifier (Cell Identifier (ID)) or to different cell IDs. This cell ID may be a physical cell ID or a virtual cell ID.

[0029] Multiple TRPs (e.g., TRP #1, #2) may be connected by an ideal / non-ideal backhaul, and information, data, etc., may be exchanged. Each TRP in a multi-TRP may transmit a different code word (CW) and a different layer. Non-coherent joint transmission (NCJT) may be used as one form of multi-TRP transmission.

[0030] In NCJT, for example, TRP#1 modulates and layers a first codeword and transmits a first PDSCH using a first precode with a first number of layers (e.g., 2 layers). TRP#2 modulates and layers a second codeword and transmits a second PDSCH using a second precode with a second number of layers (e.g., 2 layers).

[0031] Furthermore, multiple PDSCHs (Multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. In other words, a first PDSCH from a first TRP and a second PDSCH from a second TRP may overlap in at least one of the time and frequency resources.

[0032] These first and second PDSCHs may be assumed not to be quasi-co-located. Reception of multiple PDSCHs may be reinterpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0033] Multiple PDSCHs from a multi-TRP (sometimes called multiple PDSCHs) may be scheduled using a single DCI (single DCI, single PDCCH) (single-master mode, single-DCI based multi-TRP). Multiple PDSCHs from a multi-TRP may each be scheduled using multiple DCIs (multi-DCI, multiple PDCCH) (multi-master mode, multi-DCI based multi-TRP).

[0034] In URLLC for multiple TRPs, support for PDSCH (Transport Block (TB) or Codeword (CW)) repetition spanning multiple TRPs is being considered. Support for repetition schemes (URLLC schemes, e.g., schemes 1, 2a, 2b, 3, 4) spanning multiple TRPs on the frequency domain, layer (spatial) domain, or time domain is being considered. In scheme 1, multiple PDSCHs from multiple TRPs are performed using space division multiplexing (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are performed using frequency division multiplexing (FDM). In scheme 2a, the redundant version (RV) is the same for multiple TRPs. In scheme 2b, the RV may be the same or different for multiple TRPs. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are performed using time division multiplexing (TDM). In Scheme 3, multi-PDSCH signals from multi-TRPs are transmitted within a single slot. In Scheme 4, multi-PDSCH signals from multi-TRPs are transmitted within different slots.

[0035] Such multi-TRP scenarios allow for more flexible transmission control using high-quality channels.

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

[0037] A UE may be determined to be a multi-TRP based on multi-DCI if at least one of the following conditions 1 and 2 is met. In this case, TRP may be interpreted as a CORESET pool index. [Condition 1] A CORESET pool index of 1 is set. [Condition 2] Two different values ​​(e.g., 0 and 1) are set for the CORESET pool index.

[0038] The UE may determine a single DCI-based multi-TRP if the following conditions are met. In this case, the two TRPs may be interpreted as two TCI states indicated by MAC CE / DCI. [conditions] The "Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE" is used to specify one or two TCI states for a single code point in the TCI field within the DCI.

[0039] The DCI for common beam indication may be in 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 in a UE-group common DCI format.

[0040] (Simultaneous beam updates for multiple CCs) In Rel.16, one MAC CE can update the beam indices (TCI status) of multiple CCs.

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

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

[0043] The PDSCH TCI status activation MAC CE activates the TCI status on all BWP / CCs in the applicable CC list.

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

[0045] In the example in Figure 1, the UE is configured with an applicable CC list showing CC#0, #1, #2, and #3, and a list showing 64 TCI states for each CC's CORESET or PDSCH. When one TCI state for CC#0 is activated by MAC CE, the corresponding TCI states for CC#1, #2, and #3 are activated.

[0046] It has been investigated whether such simultaneous beam updates are applicable only to single TRP cases.

[0047] For PDSCH, UE may follow procedure A below. [Procedure A] The UE receives activation commands to map up to eight TCI states to code points in DCI fields (TCI fields) within a single CC / DL BWP, or within a set of CC / BWPs. When one set of TCI state IDs is activated for a set of CC / DL BWPs, the applicable list of the CC is determined by the CC specified in the activation command, and the same set of TCI states is applied to all DL BWPs within the specified CC. A set of TCI state IDs can only be activated for a set of CC / DL BWPs if the UE does not provide multiple different values ​​for the CORESET Pool Index in the CORESET Information Element (ControlResourceSet) and does not provide at least one TCI code point that maps to two TCI states.

[0048] For PDCCH, UE may be based on the following procedure B. [Procedure B] If the UE provides a simultaneous TCI cell list (simultaneousTCI-CellList) for simultaneous TCI state activation by simultaneous TCI update lists (at least one of simultaneousTCI-UpdateList-r16 and simultaneousTCI-UpdateListSecond-r16), the UE applies the antenna port quasi co-location (QCL) provided by the TCI state having the same activated TCI state ID value to the CORESET having 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 only be provided for simultaneous TCI state activation if the UE does not provide multiple different values ​​for the CORESET pool index (CORESETPoolIndex) in the CORESET information element (ControlResourceSet) and does not provide at least one TCI code point that maps to two TCI states.

[0049] For semi-persistent (SP) / aperiodic (AP)-SRS, UE may be based on the following procedure C. [Step C] When the spatial relation information (spatialRelationInfo) for an SP or AP-SRS resource, set by the SRS resource information element (higher layer parameter SRS-Resource) for a set of CC / BWPs, is activated / updated by MAC CE, the applicable list of the CC is then indicated by the simultaneous spatial update list (higher layer parameter simultaneousSpatial-UpdateList-r16 or simultaneousSpatial-UpdateListSecond-r16), and the spatial relation information is applied to all BWPs within the indicated CC that have the same SRS resource ID for the SP or AP-SRS resource. If the UE does not provide multiple different values ​​for the CORESET Pool Index within the CORESET Information Element (ControlResourceSet) and does not provide at least one TCI code point that maps to two TCI states, then the spatial relation information for an SP or AP-SRS resource set by the SRS resource information element (upper layer parameter SRS-Resource) for one set of CC / BWP will be activated / updated by the MAC CE.

[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 that can have their TCI relationships updated simultaneously using MAC CE. simultaneousTCI-UpdateList1-r16 and simultaneousTCI-UpdateList2-r16 do not contain 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 simultaneously updated using MAC CE. `simultaneousSpatial-UpdatedList1-r16` and `simultaneousSpatial-UpdatedList2-r16` do not contain the same serving cell.

[0052] Here, the concurrent TCI update list and concurrent spatial update list are set by RRC, the CORESET pool index for CORESET is set by RRC, and the TCI code points mapped to TCI states are indicated by MAC CE.

[0053] (Unified / Common TCI Framework) According to the Unified TCI Framework, UL and DL channels can be controlled by a common framework. Rather than defining 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 be applied to all UL channels, and a common beam for DL ​​may be applied to all DL channels.

[0054] One common beam for both DL and UL, or a common beam for DL ​​and a common beam for UL (two common beams in total) are being considered.

[0055] The UE may assume the same TCI state (joint TCI state, joint TCI pool, joint common TCI pool, joint TCI state set) for UL and DL. Alternatively, the UE may assume different TCI states for UL and DL respectively (separate TCI state, separate TCI pool, UL separate TCI pool and DL separate TCI pool, separate common TCI pool, UL common TCI pool and DL common TCI pool).

[0056] The default beams for UL and DL may be aligned by beam management based on MAC CE (MAC CE level beam indication). Alternatively, the default TCI status of PDSCH may be updated to match 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 (joint common TCI pool, joint TCI pool, set) for both UL and DL. X (>1) TCI states may be activated by MAC CE. UL / DL DCI may select one from the X active TCI states. The selected TCI state may be applied to both UL and DL channels / RS.

[0058] A TCI pool (set) may be multiple TCI states configured by the RRC parameter, or multiple TCI states (active TCI states, active TCI pool, set) activated by MAC CE from among multiple TCI states configured by the RRC parameter. Each TCI state may be a QCL type A / D RS. SSB, CSI-RS, or SRS may be set as the QCL type A / D RS.

[0059] The number of TCI states corresponding to each of the one or more TRPs may be defined. For example, the number of TCI states N (≧1) applied to the UL channel / RS (UL TCI states) and the number of TCI states M (≧1) applied to the DL channel / RS (DL TCI states) may be defined. At least one of N and M may be notified / set / instructed to the UE via upper layer signaling / physical layer signaling.

[0060] In this disclosure, when N=M=X (where X is any integer), it may mean that X TCI states (joint TCI states) common to the UL and DL (corresponding to X TRPs) are notified / set / instructed to the UE. Also, when N=X (where X is any integer) and M=Y (where Y is any integer, Y=X), it may mean that X TCI states (corresponding to X TRPs) for the UL and Y TCI states (corresponding to Y TRPs) for the DL (i.e., separate TCI states) are notified / set / instructed to the UE, respectively.

[0061] For example, if N=M=1 is written, it may mean that the UE is notified / set / instructed to have a TCI state common to one UL and DL for a single TRP (a joint TCI state for a single TRP).

[0062] Furthermore, if, for example, N=1 and M=1 are specified, it may mean that the UE is separately notified / configured / instructed to have one UL TCI state and one DL TCI state for a single TRP (separate TCI states for a single TRP).

[0063] Furthermore, for example, if N=M=2 is written, it may mean that the UE is notified / set / instructed to have a common TCI state for multiple (two) TRPs and multiple (two) ULs and DLs (a joint TCI state for multiple TRPs).

[0064] Furthermore, if it is written as N=2, M=2, for example, it may mean that the UE is notified / configured / instructed to have multiple (two) UL TCI states and multiple (two) DL TCI states for multiple (two) TRPs (separate TCI states for multiple TRPs).

[0065] In the above example, we described the case where the values ​​of N and M are 1 or 2, but the values ​​of N and M may be 3 or greater, and N and M may be different.

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

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

[0068] At least one of the multiple TCI states set by the RRC parameter and the multiple TCI states activated by MAC CE may be called a TCI pool (common TCI pool, joint TCI pool, TCI state pool). The multiple TCI states activated by MAC CE may be called an active TCI pool (active common TCI pool).

[0069] In this disclosure, the higher-layer parameters (RRC parameters) that set up multiple TCI states may also be referred to as configuration information that sets up multiple TCI states, or simply as "configuration information." Furthermore, in this disclosure, being directed to one of multiple TCI states using DCI may mean receiving instruction information that directs to one of the multiple TCI states included in DCI, or simply receiving "instruction information."

[0070] In the example in Figure 2B, the RRC parameter sets up multiple TCI states (joint common TCI pool) for both DL and UL. MAC CE may activate multiple TCI states (active TCI pool) from the set up multiple TCI states. Separate active TCI pools for UL and DL may be set up / activated.

[0071] A DL DCI, or a new DCI format, may select (instruct) one or more (e.g., one) TCI states. The selected TCI state may be applied to one or more (or all) DL channels / RS. 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. A UL DCI, or a new DCI format, may select (instruct) one or more (e.g., one) TCI states. The selected TCI state may be applied to one or more (or all) UL channels / RS. UL channels may be PUSCH / SRS / PUCCH. Thus, different DCIs may instruct UL TCI and DL DCI separately.

[0072] Existing DCI formats 1_1 / 1_2 may be used to indicate common TCI states.

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

[0074] (analysis) As described above, within the unified TCI framework, the common / unified TCI state can be set / instructed / updated by DCI.

[0075] From Rel.17 onward, it is being considered that the DCI should be at least one of the following: a DCI format with DL assignment that includes existing (as defined up to Rel.15 / 16) TCI fields (which may also be called TCI status fields); a DCI format without DL assignment that includes existing TCI fields; a DCI format without DL assignment that includes new (as defined from Rel.17 onward) TCI fields; or a new DCI format that includes new TCI fields.

[0076] In this disclosure, the following can be interpreted interchangeably: DCI (DCI format) that does not show scheduling for either PDSCH or PUSCH, DCI (DCI format) that does not show scheduling for PDSCH, DCI (DCI format) without DL assignment, DCI format for DL ​​assignment but without scheduling for PDSCH, DCI format with fields for DL ​​assignment but without scheduling for PDSCH, and DCI (DCI format) that includes TCI fields but without scheduling for PDSCH. The DCI format with / without DL assignment may be, for example, DCI format 1_1 / 1_2. A new DCI format may be represented by DCI format X_Y (where X and Y are any number). A new TCI field may be a field reused from an existing field used for scheduling PDSCH that is not used, or it 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 instruct / update the UE on the UL and DL TCI status (joint TCI status), as well as the DL TCI status.

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

[0079] However, as mentioned above, when using DCI to indicate the UL / DL TCI status, there is insufficient consideration given 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, it may not be possible to properly indicate the TCI status, which could lead to a deterioration in communication quality, throughput, etc.

[0080] Therefore, the inventors devised a method for setting the TCI state when specifying a unified / common TCI.

[0081] The embodiments of this disclosure will be described in detail below with reference to the drawings. Each wireless communication method according to the embodiments may be applied individually or in combination.

[0082] In this disclosure, “A / B / C” and “at least one of A, B, and C” may be interpreted as mutually exclusive. In this disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be interpreted as mutually exclusive. In this disclosure, index, ID, indicator, and resource ID may be interpreted as mutually exclusive. In this disclosure, support, control, controllable, operate, and operable may be interpreted as mutually exclusive.

[0083] In this disclosure, configure, activate, update, indicate, enable, specify, and select may be interpreted as interchangeable.

[0084] In this disclosure, higher-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof. In this disclosure, RRC, RRC signaling, RRC parameters, higher layer, higher-layer parameters, RRC information elements (IE), and RRC messages may be interpreted as one another.

[0085] MAC signaling may use, for example, MAC Control Elements (MAC CEs) or MAC Protocol Data Units (PDUs). Broadcast information may also include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), or Other System Information (OSIs).

[0086] In this disclosure, MAC CE and activation / deactivation commands may be interpreted as interchangeable.

[0087] In this disclosure, pool, set, group, list, and candidate may be interpreted as interchangeable.

[0088] In this disclosure, DMRS, DMRS port, and antenna port may be interpreted as interchangeable.

[0089] In this disclosure, the terms special cell, SpCell, PCell, and PSCell may be interpreted as interchangeable.

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

[0091] In this 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) of Channels / RS, TCI State applicable to multiple types of Channels / RS, and PL-RS may be interpreted interchangeably.

[0092] In this disclosure, the terms "multiple TCI states set 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 set / activated by RRC / MAC CE," and "TCI state information" may be interpreted interchangeably.

[0093] In this disclosure, the terms panel, Uplink (UL) transmit entity, TRP, spatial relationship, control resource set (CORESET), PDSCH, codeword, base station, antenna port for a signal (e.g., demodulation reference signal (DMRS) port), group of antenna ports for a 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)), and layer (MIMO layer, transmit layer, spatial layer) may be interpreted as one another. Also, the terms panel identifier (ID) and panel may be interpreted as one another. In this disclosure, TRP ID, TRP-related ID, CORESET pool index, the position of one of two TCI states corresponding to a code point in a field within DCI (ordinal number, first TCI state or second TCI state), and TRP may be interpreted as other terms.

[0094] In this disclosure, TRP, transmit point, panel, DMRS port group, CORESET pool, and one of two TCI states associated with one code point in the TCI field may be interpreted as one another.

[0095] In this disclosure, single TRP, single TRP system, single TRP transmission, and single PDSCH may be interpreted as mutually exclusive. In this disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be interpreted as mutually exclusive. In this disclosure, single DCI, single PDCCH, multi-TRP based on single DCI, and activating two TCI states on at least one TCI code point may be interpreted as mutually exclusive.

[0096] In this disclosure, the following can be interpreted interchangeably: single TRP, channel using single TRP, channel using one TCI state / spatial relationship, multi-TRP not being enabled by RRC / DCI, multiple TCI state / spatial relationships not being enabled by RRC / DCI, no CORESET pool index value of 1 being set for any CORESET, and no code point in a TCI field being mapped to two TCI states.

[0097] In this disclosure, multi-TRP, channels using multi-TRP, channels using multiple TCI state / spatial relationships, multi-TRP being enabled by RRC / DCI, multiple TCI state / spatial relationships being enabled by RRC / DCI, and at least one of a single-DCI-based multi-TRP and a multi-DCI-based multi-TRP may be interpreted as mutually exclusive. In this disclosure, multi-DCI-based multi-TRP and a CORESET pool index (CORESETPoolIndex) value of 1 is set for a CORESET may be interpreted as mutually exclusive. In this disclosure, single-DCI-based multi-TRP and at least one code point of a TCI field being mapped to two TCI states may be interpreted as mutually exclusive.

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

[0099] In this disclosure, CORESET0, CORESET having index 0, and common CORESET may be interpreted as interchangeable.

[0100] (Wireless communication method) In this disclosure, DL TCI, DL only TCI, DL common TCI, DL unified TCI, common TCI, and unified TCI may be interpreted interchangeably. In this disclosure, UL TCI, UL only TCI, UL common TCI, UL unified TCI, common TCI, and unified TCI may be interpreted interchangeably.

[0101] In this disclosure, "joint TCI pool" and "when a joint TCI pool is established" may be interpreted interchangeably. In this disclosure, "separate TCI pool" and "when a separate TCI pool is established" may be interpreted interchangeably.

[0102] In this disclosure, the phrases "a joint TCI pool is established," "a TCI pool established for DL ​​and a TCI pool established for UL are common," "a TCI pool is established for both DL and UL," and "a single TCI pool (a single set of TCIs) is established" may be interpreted interchangeably.

[0103] In this disclosure, the following can be interpreted interchangeably: when a separate TCI pool is set up; when the TCI pool set up for DL ​​and the TCI pool set up for UL are different; when a TCI pool for DL ​​(first TCI pool, first TCI set) and a TCI pool for UL (second TCI pool, second TCI set) are set up; when multiple TCI pools (multiple sets of TCIs) are set up; and when a TCI pool for DL ​​is set up. When a TCI pool for DL ​​is set up, the TCI pool for UL may be equal to the set up TCI pool.

[0104] In this disclosure, the channel / RS to which the common TCI applies may be PDSCH / HARQ-ACK information / PUCCH / PUSCH / CSI-RS / SRS.

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

[0106] In this disclosure, terms such as signaling configuration, signaling, setting, configuration, setting information, instruction, instruction information, etc., may be interpreted interchangeably.

[0107] In this 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 interpreted as mutually exclusive. In this disclosure, per cell BFR, cell-specific BFR, and BFR for Rel. 15 / 16 may be interpreted as mutually exclusive. In this disclosure, per TRP BFR, TRP-specific BFR, and BFR for Rel. 17 / Rel. 17 and later may be interpreted as mutually exclusive.

[0108] <First Embodiment> The UE may specify at least one (or at least two) of the following: DL TCI state, UL TCI state, and TCI state common to UL and DL, in at least one of the existing DCI formats (e.g., DCI format 1_1 / 1_2 with DL assignment) and the new DCI format (e.g., DCI format 1_1 / 1_2 without DL assignment).

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

[0110] For the UE, at least one of the following may be set / instructed using higher-layer signaling (RRC / MAC CE): DL TCI state, UL TCI state, or TCI state common to UL and DL, indicated by a code point in the TCI field included in the DCI.

[0111] Figure 3 shows an example of setting / instructing TCI states by upper-layer signaling according to the first embodiment. As shown in the example in Figure 3, the UE is set / instructed to associate (e.g., a table / list / pool) between the code points indicated by the TCI field of the DCI and the TCI states using upper-layer signaling (e.g., RRC signaling / MAC CE). Based on this association and the code points of the TCI state fields included in the DCI, the UE may determine which TCI state to apply to at least one of the DL signal / channel and the UL signal / channel.

[0112] As shown in the example in Figure 3, the TCI state list / pool configured / notified by upper-layer signaling may be common to both joint TCI states and separate TCI states. In other words, the TCI state list / pool configured / notified by upper-layer signaling may include one or more TCI states for indicating joint TCI states and one or more TCI states for indicating separate TCI states. As shown in Figure 3, it is possible to distinguish between those for indicating joint TCI states and those for indicating separate TCI states using different code points.

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

[0114] The TCI states corresponding to the joint TCI states (e.g., TCI states #0 / #1 / #2 / #3 in Figure 3) may include information regarding UL and DL (e.g., parameters related to Transmit Power Control (TPC)). Conversely, the DL TCI states of the separate TCI states (e.g., TCI states #4 / #6 / #8 / #10 in Figure 3) may include only information regarding DL (e.g., they may not include parameters related to TPC).

[0115] Figure 4 shows another example of setting / indicating TCI states by upper-layer signaling according to the first embodiment. In contrast to Figure 3 described above, Figure 4 differs in that it does not distinguish between joint TCI states and separate TCI states in the association between TCI field code points and TCI states.

[0116] For example, if the UE is instructed to perform one TCI state (TCI states #0 / #1 / #2 / #3 in Figure 4), it may determine that a joint TCI state has been instructed. Alternatively, if the UE is instructed to perform two TCI states, it may determine that a separate TCI state has been instructed. In this case, the UE may determine that the TCI state with the larger (or smaller) TCI state ID is a DL TCI state, and the TCI state with the smaller (or larger) TCI state ID is a UL TCI state.

[0117] The diagram illustrating the relationship between the TCI field code point and the TCI state in this disclosure is merely an example, and the number of bits in the TCI field code point, the TCI state ID / number, etc., are not limited to those shown.

[0118] Figure 5 shows an example of the configuration of RRC information elements for setting the TCI state according to the first embodiment. In the first embodiment, the RRC information elements for setting the TCI state (unified / common TCI state) may have the configuration shown in Figure 5.

[0119] As shown in the example in Figure 5, a Unified TCI List may contain up to 128 common / unified TCI states. However, the maximum number of common / unified TCI states included in the Unified TCI List is not limited to 128; it may be any number (for example, 64).

[0120] As shown in the example in Figure 5, the parameters relating 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 DL and UL common TCI state (joint TCI state), DL TCI state, and UL TCI state. Alternatively, the Unified / Common TCI state ID may be numbered in the order of DL and UL common TCI state (joint TCI state), UL TCI state, and DL TCI state.

[0121] As shown in the example in Figure 5, for a given Unified TCI state ID, one of the following parameters may be selected (CHOICE): the parameters for a DL and UL common TCI state (joint TCI state) (DL / UL joint TCI), the parameters for a DL TCI state (DL TCI), or the parameters for a UL TCI state (UL TCI). The parameters for 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 parameters (simply labeled "parameter" in Figure 5).

[0122] Figure 6 shows an example of the configuration of a MAC CE for setting / instructing the TCI state according to the first embodiment. In the first embodiment, the MAC CE for setting / instructing the TCI state (unified / common TCI state) may have the configuration shown in Figure 6. In the MAC CE shown in Figure 6, the association between the code point of the TCI field of the DCI and the TCI state may be made.

[0123] As shown in the example in Figure 6, the MAC CE for setting / instructing the TCI state (unified / common TCI state) includes a bit field indicating the Serving Cell ID (labeled Serving Cell ID), a bit field indicating the BWP ID (labeled BWP ID), and a bit field indicating the TCI state ID (labeled TCI state ID). i,j (where i is an integer from 0 to N, and j is 1 or 2), and a bit field (C) indicating the number of TCI states. i It may include at least one of the following: (indicated as ), reserved bit (indicated as R).

[0124] In the example in Figure 6, the MAC CE for setting / indicating the TCI state (unified / common TCI state) consists of M octets. "i" may correspond to the index of the code point of the TCI state field indicated by 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 in Figure 6, when the bit field indicating the number of TCI states shows a first value (e.g., 0), it may indicate that the TCI state corresponding to that bit field (in the same row) is one TCI state (e.g., a TCI state common to UL and DL (joint TCI state)). Alternatively, when the bit field indicating the number of TCI states shows a second value (e.g., 1), it may indicate that the TCI states corresponding to that bit field (in the same row and the row immediately below it) 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 becomes possible to appropriately set / instruct the association between the code points of 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 set / notified to the UE differs for joint TCI states, DL TCI states, and ULTCI states.

[0128] Figure 7 shows an example of setting / instructing TCI states by upper-layer signaling according to the second embodiment. As shown in the example in Figure 7, the UE is set / instructed to associate (e.g., a table / list / pool) between the code points indicated by the TCI field of the DCI and the TCI states using upper-layer signaling (e.g., RRC signaling / MAC CE). Based on this association and the code points of the TCI state fields included in the DCI, the UE may determine which TCI state to apply to at least one of the DL signal / channel and the UL signal / channel.

[0129] As shown in the example in Figure 7, a TCI state list / pool may be set up at a higher layer for each of the joint TCI state, DL TCI state, and UL TCI state. As shown in the example in Figure 7, the candidate TCI states for each of the joint TCI state and 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, DL TCI state, and UL TCI state may be different TCI states.

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

[0131] The TCI state corresponding to the joint TCI state may include information about UL and DL (e.g., parameters related to transmit power control (TPC)). Conversely, the DL TCI state in the separate TCI state may include only information about DL (e.g., it may not include parameters related to TPC).

[0132] Figure 8 shows an example of the configuration of RRC information elements for setting the TCI state according to the second embodiment. In the second embodiment, the RRC information elements for setting the TCI state (unified / common TCI state) may have the configuration shown in Figure 8.

[0133] As shown in the example in Figure 8, the parameters for the Unified TCI state may include at least one of the following: the DL / UL joint TCI List, the DL TCI List, and the UL TCI List. Each of these may contain up to 128 TCI state parameters. However, the maximum number of TCI states included in each TCI state list is not limited to 128, but may be any number (e.g., 64).

[0134] As shown in the example in Figure 8, the parameters for each TCI state (DL / UL joint TCI / DL TCI / UL TCI) may include a parameter indicating the TCI state ID (DL / UL joint TCI state ID / DL TCI state ID / UL TCI state ID), and an optional parameter (simply labeled "parameter" in Figure 8).

[0135] Figure 9 shows an example of the configuration of a MAC CE for setting / instructing the TCI state according to the second embodiment. In the second embodiment, the MAC CE for setting / instructing the TCI state (unified / common TCI state) may have the configuration shown in Figure 9. In the MAC CE shown in Figure 9, the association between the code point of the DCI's TCI field and the TCI state may be made.

[0136] As shown in the example in Figure 9, the MAC CE for setting / instructing the TCI state (unified / common TCI state) includes a bit field indicating the Serving Cell ID (labeled Serving Cell ID), a bit field indicating the BWP ID (labeled BWP ID), and a bit field indicating the TCI state ID (labeled TCI state ID). i,jand (i is an integer from 0 to N, j is 1 or 2), a bit field (C) indicating the number of TCI states i as described), a bit field (P) for indicating the UL TCI state i as described), a reserved bit (described as R), may include at least one of them.

[0137] In the example of FIG. 9, the MAC CE for setting / indicating the TCI state (unified / common TCI state) is composed of M octets. "i" may correspond to the index of the code point of the TCI state field indicated by the DCI. "TCI state ID i,j " may indicate the j-th TCI state of the code point of the i-th TCI state field.

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

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

[0140] In the first embodiment of MAC CE, a total of X TCI state IDs (128 in the example above) can be set for the common TCI state for DL ​​and UL, the DL TCI state, and the UL TCI state. In contrast, in the second embodiment, X TCI state IDs (i.e., a total of 3X) can be set for each of the common TCI state for DL ​​and UL, the DL TCI state, and the UL TCI state. The second embodiment allows for the setting of more TCI state IDs than the first embodiment, and the MAC CE signaling overhead is the same as in the first embodiment, making the operation of MAC CE in the second embodiment preferable. As mentioned above, 128, which is stated as the maximum number of TCI state IDs, is merely an example and is not limited to this number.

[0141] According to the second embodiment described above, it becomes possible to appropriately set / instruct the association between the code points of the TCI field and the TCI state using upper-layer signaling.

[0142] <Modifications of the first and second embodiments> At least one of the MAC CEs for setting / instructing common TCI states described in the first embodiment and the MAC CEs for setting / instructing common TCI states described in the second embodiment may be a MAC CE defined in Rel. 17 or later, or an "Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE" defined in Rel. 16.

[0143] In order for the UE to distinguish between the UE-specific extended TCI state activation / deactivation MAC CE for PDSCH (which may be called the first MAC CE) and the MAC CE for setting / instructing common TCI states (which may be called the second MAC CE), as defined in Rel.16, the MAC PDU may be set with an ID to distinguish between the first MAC CE and the second MAC CE.

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

[0145] Figure 10 shows an example of the configuration of a MAC CE according to a modification of the first and second embodiments. In the example shown in Figure 10, the MAC CE includes a specific bit field (indicated 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. 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 based on the specific bit field.

[0146] Note that the location, size, and name of the specific bit field shown in Figure 10 are merely examples and are not limited to them.

[0147] As described above, this embodiment makes it possible to appropriately distinguish between existing MAC CEs (as defined up to Rel. 16) and MAC CEs for setting / indicating common TCI states as defined in Rel. 17 and later.

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

[0149] A UE that has the corresponding higher-layer parameter (the parameter that enables the function) set may perform that function. It may also be stipulated that "a UE for which the corresponding higher-layer parameter is not set shall not perform that function (for example, in accordance with Rel. 15 / 16)."

[0150] A UE that reports its UE capability to support a particular function may perform that function. It may also be stipulated that "a UE that does not report its UE capability to support a particular function shall not perform that function (e.g., in accordance with Rel. 15 / 16)."

[0151] If the UE reports its capability to support the function and the corresponding higher-layer parameters are set, the UE may perform the function. It may also be stipulated that "if the UE does not report its capability to support the function, or if the corresponding higher-layer parameters are not set, the UE shall not perform the function (e.g., according to Rel. 15 / 16)."

[0152] UE capability may indicate whether the UE supports this feature or not.

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

[0154] UE capability may be defined by whether or not it supports at least one of the following: a unified TCI state framework, a joint / separate TCI pool, or a joint / separate beam instruction.

[0155] UE capability may be defined by the number of TCI states set by the RRC for common beam indication that the UE supports. Common beam indication may be rephrased as UL separate beam indication and DL separate beam indication. Alternatively, common beam indication may be rephrased as at least one of common beam indication, UL separate beam indication, and DL separate beam indication.

[0156] 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 rephrased as UL separate beam indication and DL separate beam indication. Alternatively, common beam indication may be rephrased as at least one of common beam indication, UL separate beam indication, and DL separate beam indication.

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

[0158] UE capability may be defined by whether or not the TCI state is indicated by the DCI. For example, UE capability may be defined by whether or not the common TCI state is indicated by at least one of the new DCI format or the DCI format without DL assignment (DCI format 1_1 / 1_2).

[0159] UE capability may be defined by whether one of the joint TCI state or the separate TCI state can be indicated by a single DCI code point (DCI). The DCI code point may be a code point for an existing TCI field included in the DCI or a code point for a new field. UE capability may also be defined by whether it supports dynamic switching / conversion / updating of indications for the joint TCI state and the separate TCI state.

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

[0161] According to the third embodiment described above, 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 one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any or a combination thereof of the wireless communication methods according to the above embodiments of this disclosure.

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

[0164] Furthermore, the wireless communication system 1 may 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)), and so on.

[0165] In EN-DC, the LTE (E-UTRA) base station (eNB) is the Master Node (MN), and the NR base station (gNB) is the Secondary Node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0166] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0167] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, 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 (CC) and Dual Connectivity (DC).

[0169] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may fall in a frequency band higher than FR2.

[0170] Furthermore, the user terminal 20 may communicate using at least one of the following methods at each CC: Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0171] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, if NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0172] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0173] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0174] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. 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), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0175] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0176] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, shared by each user terminal 20.

[0177] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0178] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0179] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0180] Furthermore, the DCI that schedules PDSCH may be called a DL assignment or DL ​​DCI, and the DCI that schedules PUSCH may be called a UL grant or UL DCI. Furthermore, PDSCH may be interpreted as DL data, and PUSCH may be interpreted as UL data.

[0181] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with a particular search space based on the search space configuration.

[0182] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0183] PUCCH may transmit uplink control information (UCI) which includes at least one of the following: channel state information (CSI), delivery acknowledgment (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0184] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[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 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 SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. SS, SSB, etc., may also be called reference signals.

[0187] Furthermore, in the wireless communication system 1, the Uplink Reference Signal (UL-RS) may transmit the Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. The DMRS may also be called the User-Specific Reference Signal (UE-specific Reference Signal).

[0188] (base station) Figure 12 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, transceiver unit 120, transceiver antenna 130, and transmission line interface 140 may be provided.

[0189] In this example, the functional blocks of the characteristic parts of this 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 part described below may be omitted.

[0190] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0191] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of radio resources, etc.

[0192] The transmitting / receiving 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 transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0193] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0194] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0195] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0196] The transmitting / receiving unit 120 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0197] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., to generate a bit sequence to be transmitted.

[0198] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, 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, and output a baseband signal.

[0199] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving 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 transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing to the acquired baseband signal, such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0202] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to 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 also measure received power (e.g., Reference Signal Received Power (RSRP)), reception 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 send and receive signals (backhaul signaling) with 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] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0205] The transmitting / receiving unit 120 may transmit: first information indicating a plurality of transmission setting instruction (TCI) states; second information relating to the association between a field indicating a transmission setting 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 of 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 a TCI state included in DCI indicating one or more TCI states (first and second embodiments).

[0206] (User terminal) Figure 13 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0207] In this example, the functional blocks of the characteristic parts of this 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 part described below may be omitted.

[0208] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0209] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0210] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0211] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0212] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0213] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0214] The transmitting / receiving unit 220 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0215] The transmitting / receiving 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 and control information acquired from the control unit 210, etc., to generate a bit sequence to be transmitted.

[0216] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, 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, and output a baseband signal.

[0217] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0218] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0219] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0220] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0221] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0222] In this disclosure, the transmitting and receiving units of the user terminal 20 may consist of at least one of a transmitting / receiving unit 220, a transmitting / receiving antenna 230, and a transmission path interface 240.

[0223] The transmitting / receiving unit 220 may receive first information indicating a plurality of transmission setting instruction (TCI) states, second information relating to the association between a field indicating a transmission setting instruction (TCI) state included in downlink control information (DCI) and one or more TCI states to be applied to multiple types of signals, and DCI indicating one or more TCI states from among the plurality of TCI states. The control unit 210 may apply the one or more TCI states to multiple types of signals based on the first information, the second information, and the field indicating a TCI state included in DCI indicating one or more TCI states (first and second embodiments).

[0224] The first information may be a list of multiple TCI states. 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 in common for the TCI state indication common to both the uplink and downlink, the TCI state indication for the downlink only, and the TCI state indication for the uplink only (first embodiment). Alternatively, the first information may be set separately for each of the TCI state indication common to both the uplink and downlink, the TCI state indication for the downlink only, and the TCI state for the uplink only (second embodiment).

[0226] A DCI showing one or more TCI states may be a DCI that does not show scheduling for either a physical downlink shared channel or a physical uplink shared channel (first and second embodiments).

[0227] (Hardware configuration) The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0228] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0229] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 14 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0230] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0231] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented using one or more chips.

[0232] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or to control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0233] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0234] Furthermore, the processor 1001 reads programs (program code), 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 accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. 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 other functional blocks may be implemented similarly.

[0235] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of this disclosure.

[0236] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital multipurpose disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be called an auxiliary storage device.

[0237] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated implementations of a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0238] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0239] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for 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), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0241] (modified version) In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0242] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist 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 neuralelogy may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neuralelogy may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain.

[0244] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0245] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0246] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0247] For example, one subframe may be called TTI, multiple consecutive subframes may be called TTI, or one slot or one mini-slot may be called TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0248] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0249] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0250] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0251] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in 3GPP Rel.8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a sub slot, or a slot.

[0252] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0253] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0254] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0255] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0256] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0257] A Bandwidth Part (BWP) (also called a partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0258] A BWP may include UL BWPs (BWPs for UL) and DL BWPs (BWPs for DL). One or more BWPs may be configured within a single carrier for a UE.

[0259] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0260] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative examples. For instance, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots within a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0261] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or corresponding other information. For example, wireless resources may be indicated by a predetermined index.

[0262] The names used for parameters and other elements in this disclosure are not restrictive in any way. Furthermore, mathematical formulas and other elements that use these parameters may differ from those expressly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0263] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0264] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0265] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0266] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof).

[0267] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Element (CE).

[0268] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not notifying the specified information or by notifying other information).

[0269] The determination may be made based on a value represented by 1 bit (either 0 or 1), a boolean value represented by true or false, or a numerical comparison (e.g., comparison with a predetermined value).

[0270] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., regardless of whether it is called software, firmware, middleware, microcode, a hardware description language, or another name.

[0271] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0272] The terms "system" and "network" used in this disclosure may be used interchangeably. "Network" may mean the devices (e.g., base stations) included in the network.

[0273] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "quasi-co-location (QCL)," "transmission configuration indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," and "panel" may be used interchangeably.

[0274] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0275] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services 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 ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

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

[0277] A mobile station may also be called 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 appropriate term.

[0278] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a 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 be a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0279] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this 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), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, uplink channel and downlink channel may be interpreted as sidelink channel.

[0280] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0281] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes with base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0282] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to that specific order.

[0283] Each aspect / embodiment described in this disclosure includes 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 (where x is, for example, an integer or decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), and IEEE This may be applied to systems utilizing 802.20, Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, as well as next-generation systems that extend these. It may also be applied in combination with multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0284] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0285] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0286] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to include judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0287] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0288] Furthermore, "judgment (decision)" can be considered as "judging (deciding)" something like resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can be considered as "judging (deciding)" something about an action.

[0289] Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

[0290] The "maximum transmit power" described in this disclosure may mean the maximum value of the transmit power, or may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

[0291] As used in this disclosure, the terms "connected" and "coupled", or any variations thereof, mean 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 "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 "accessed".

[0292] In this disclosure, when two elements are connected, they can be considered to be "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and also, as some non-limiting and non-exhaustive examples, using electromagnetic energy having wavelengths in the radio frequency region, microwave region, optical (both visible and invisible) region, etc.

[0293] In this disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "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] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0295] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0296] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The invention described herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined in the claims. Therefore, the descriptions herein are for illustrative purposes only and do not imply any limitation on the invention described herein.

[0297] This application is based on Japanese Patent Application No. 2021-069906, filed on April 16, 2021. All of its contents are included here.

Claims

1. A receiving unit that receives downlink control information (DCI) and a Medium Access Control (MAC) control element that includes a field indicating the number of TCI states corresponding to one code point in the Transmission Configuration Indication (TCI) field included in the DCI, The control unit includes, which determines that the number of TCI states is 1 when the field included in the MAC control element shows a first value, and determines that the number of TCI states is 2 when the field included in the MAC control element shows a second value. When the field included in the MAC control element indicates the second value, the single code point corresponds to both the downlink TCI state and the uplink TCI state. A terminal in which, when the field included in the MAC control element indicates the second value, the MAC control element includes a field indicating that the TCI state of the TCI state ID field, which is in the same octet, is the uplink TCI state.

2. The steps include receiving downlink control information (DCI) and a Medium Access Control (MAC) control element which includes a field indicating the number of TCI states corresponding to one code point in the Transmission Configuration Indication (TCI) field included in the DCI, The process includes the steps of determining that the number of TCI states is 1 if the field included in the MAC control element shows a first value, and determining that the number of TCI states is 2 if the field included in the MAC control element shows a second value. When the field included in the MAC control element indicates the second value, the single code point corresponds to both the downlink TCI state and the uplink TCI state. A wireless communication method for a terminal, wherein, when the field included in the MAC control element indicates the second value, the MAC control element includes a field indicating that the TCI state of the TCI state ID field, which is in the same octet, is the uplink TCI state.

3. A transmission unit that transmits downlink control information (DCI) and a Medium Access Control (MAC) control element that includes a field indicating the number of TCI states corresponding to one code point in the Transmission Configuration Indication (TCI) field included in the DCI, The system includes a control unit that, when the field included in the MAC control element shows a first value, indicates that the number of TCI states is one, and when the field included in the MAC control element shows a second value, indicates that the number of TCI states is two. When the field included in the MAC control element indicates the second value, the single code point corresponds to both the downlink TCI state and the uplink TCI state. A base station in which, when the field included in the MAC control element indicates the second value, the MAC control element includes a field indicating that the TCI state of the TCI state ID field, which is in the same octet, is the uplink TCI state.

4. A system having a base station and a terminal, The aforementioned base station is The device has a transmission unit that transmits downlink control information (DCI) and a Medium Access Control (MAC) control element that includes a field indicating the number of TCI states corresponding to one code point in the Transmission Configuration Indication (TCI) field included in the DCI, The aforementioned terminal is A receiving unit that receives the MAC control element and the DCI, The control unit includes, which determines that the number of TCI states is 1 when the field included in the MAC control element shows a first value, and determines that the number of TCI states is 2 when the field included in the MAC control element shows a second value. When the field included in the MAC control element indicates the second value, the single code point corresponds to both the downlink TCI state and the uplink TCI state. A system in which, when the field included in the MAC control element indicates the second value, the MAC control element includes a field indicating that the TCI state of the TCI state ID field, which is in the same octet, is the uplink TCI state.

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