Terminal, wireless communication method, base station and system

Abstract

A terminal according to an aspect of the present disclosure comprises: a reception unit which receive a plurality of downlink control information formats, each including a transmission configuration indication (TCI) state indication; and a control unit which applies the TCI state indicated by one of the plurality of downlink control information formats at a specific timing after the reception of the plurality of downlink control information formats. According to an aspect of the present disclosure, the TCI state can be suitably determined.

Description

Terminal, wireless communication method and base station

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

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

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

[0004] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

[0005] It is considered that in future wireless communication systems, the transmission configuration indication (TCI) status for one or more channels / signals will be indicated by one piece of downlink control information.

[0006] However, when a UE receives multiple DCIs related to the TCI state, it is unclear how to determine the TCI state. If the operation for multiple DCIs is unclear, communication throughput may be reduced.

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

[0008] A terminal according to one aspect of the present disclosure includes a receiving unit that receives a plurality of downlink control information formats, each of which includes a transmission configuration indication (TCI) state indication, and a control unit that applies the TCI state indicated by one of the plurality of downlink control information formats at a specific timing after receiving the plurality of downlink control information formats.

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

[0010] 1A and 1B show an example of a unified TCI state. FIG. 2 shows an example of a BAT. FIGS. 3A and 3B show an example of a first embodiment. FIG. 4 shows an example of a second embodiment. FIG. 5 shows an example of a third embodiment. FIGS. 6A and 6B show another example of the third embodiment. FIG. 7 shows an example of a fourth embodiment. FIG. 8 shows another example of the fourth embodiment. FIG. 9 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 10 is a diagram showing an example of a configuration of a base station according to an embodiment. FIG. 11 is a diagram showing an example of a configuration of a user terminal according to an embodiment. FIG. 12 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. FIG. 13 is a diagram showing an example of a vehicle according to an embodiment.

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

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

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

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

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

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

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

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

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

[0020] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0021] Furthermore, the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).

[0022] An SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). An SSB may also be referred to as an SS / PBCH block.

[0023] An RS of QCL type X in a TCI state may refer to an RS that has a QCL type X relationship with a certain channel / signal (DMRS), and this RS may be called a QCL source of QCL type X in the TCI state.

[0024] (Unified / Common TCI Framework) The unified TCI framework allows UL and DL channels to be controlled by a common framework. Instead of specifying TCI states or spatial relationships for each channel as in Rel. 15, the unified TCI framework may specify a common beam (common TCI state) and apply it to all UL and DL channels, or a common beam for UL may apply to all UL channels and a common beam for DL ​​may apply to all DL channels.

[0025] One common beam for both DL and UL, or one common beam for DL ​​and one common beam for UL (two common beams overall) are considered.

[0026] The UE may assume the same TCI state for UL and DL (joint TCI state, joint TCI pool, joint common TCI pool, joint TCI state set). The UE may assume different TCI states for UL and DL (separate TCI state, separate TCI pool, UL separate TCI pool and DL separate TCI pool, separate common TCI pool, UL common TCI pool and DL common TCI pool).

[0027] The default beams for UL and DL may be aligned via MAC CE based beam management (MAC CE level beam indication). The default TCI state of the PDSCH may be updated to align with the default UL beam (spatial relationship).

[0028] DCI-based beam management (DCI-level beam indication) may indicate a common beam / unified TCI state from the same TCI pool for both UL and DL (joint common TCI pool, joint TCI pool, set). X (>1) TCI states may be activated by the MAC CE. The UL / DL DCI may select one from the X active TCI states. The selected TCI state may apply to both UL and DL channels / RS.

[0029] The TCI pool (set) may be multiple TCI states configured by RRC parameters, or multiple TCI states (active TCI states, active TCI pools, sets) activated by MAC CE among the multiple TCI states configured by RRC parameters. Each TCI state may be a QCL type A / D RS. SSB, CSI-RS, or SRS may be configured as the QCL type A / D RS.

[0030] The number of TCI states corresponding to each of one or more TRPs may be specified. For example, the number N (≧1) of TCI states applied to UL channels / RSs (UL TCI states) and the number M (≧1) of TCI states applied to DL channels / RSs (DL TCI states) may be specified. At least one of N and M may be notified / configured / instructed to the UE via higher layer signaling / physical layer signaling.

[0031] In the present disclosure, when N=M=X (X is any integer), it may mean that X TCI states (joint TCI states) common to UL and DL (corresponding to X TRPs) are notified / configured / indicated to the UE. Also, when N=X (X is any integer) and M=Y (Y may be any integer, Y=X), it may mean that X UL TCI states (corresponding to X TRPs) and Y DL TCI states (i.e., separate TCI states) (corresponding to Y TRPs) are notified / configured / indicated to the UE.

[0032] For example, when N=M=1 is written, this may mean that a TCI state common to one UL and DL for a single TRP is notified / configured / indicated to the UE (joint TCI state for a single TRP).

[0033] Also, for example, when N=1 and M=1 are written, this may mean that one UL TCI state and one DL TCI state for a single TRP are separately notified / configured / instructed to the UE (separate TCI states for a single TRP).

[0034] Also, for example, when N=M=2 is written, this may mean that a TCI state common to multiple (two) ULs and DLs for multiple (two) TRPs is notified / configured / instructed to the UE (joint TCI state for multiple TRPs).

[0035] Also, for example, when N=2 and M=2, it may mean that multiple (two) UL TCI states and multiple (two) DL TCI states for multiple (two) TRPs are notified / configured / instructed to the UE (separate TCI states for multiple TRPs).

[0036] In the above example, the values ​​of N and M are 1 or 2, but the values ​​of N and M may be 3 or more, and N and M may be different.

[0037] In the example of Figure 1A, RRC parameters (information elements) configure multiple TCI states for both DL and UL. The MAC CE may activate multiple TCI states from the configured multiple TCI states. A DCI may indicate one of the activated multiple TCI states. The DCI may be a UL / DL DCI. The indicated TCI state may apply to at least one (or all) of the UL / DL channels / RS. One DCI may indicate both UL TCI and DL TCI.

[0038] In the example of this figure, a point may be one TCI state that applies to both UL and DL, or two TCI states that apply to UL and DL respectively.

[0039] At least one of the multiple TCI states configured by the RRC parameters and the multiple TCI states activated by the MAC CE may be referred to as a TCI pool (common TCI pool, joint TCI pool, TCI state pool). The multiple TCI states activated by the MAC CE may be referred to as an active TCI pool (active common TCI pool).

[0040] In the present disclosure, higher layer parameters (RRC parameters) for setting multiple TCI states may be referred to as configuration information for setting multiple TCI states, or simply as "configuration information." Also, in the present disclosure, being instructed to set one of multiple TCI states using DCI may mean receiving indication information instructing one of the multiple TCI states included in DCI, or may simply mean receiving "instruction information."

[0041] In the example of Figure 1B, the RRC parameters configure multiple TCI states (joint common TCI pools) for both DL and UL. The MAC CE may activate multiple TCI states (active TCI pools) from the configured multiple TCI states. Separate active TCI pools for each of the UL and DL may be configured / activated.

[0042] The DL DCI or a new DCI format may select (indicate) one or more (e.g., one) TCI states. The selected TCI state may apply to one or more (or all) DL channels / RSs. The DL channels may be PDCCH / PDSCH / CSI-RS. The UE may determine the TCI state of each DL channel / RS using the TCI state behavior (TCI framework) of Rel. 16. The UL DCI or a new DCI format may select (indicate) one or more (e.g., one) TCI states. The selected TCI state may apply to one or more (or all) UL channels / RSs. The UL channels may be PUSCH / SRS / PUCCH. In this way, different DCIs may indicate UL TCI and DL DCI separately.

[0043] The existing DCI formats 1_1 / 1_2 may be used to indicate the common TCI state.

[0044] A common TCI framework may have separate TCI states for DL ​​and UL.

[0045] For M=N=1 in the separate DL / UL TCI of the Rel. 17 unified TCI framework, one instance of beam indication using DCI format 1_1 / 1_2 (with / without DL assignment) is considered to follow at least one of the following beam indications 1 to 3: [Beam indication 1] One TCI field codepoint represents a pair of DL TCI state and UL TCI state. If the DCI indicates such a TCI field codepoint, the UE applies the corresponding DL TCI state and UL TCI state. [Beam indication 2] One TCI field codepoint represents only the DL TCI state. If the DCI indicates such a TCI field codepoint, the UE applies the corresponding DL TCI state and maintains the UL TCI state. [Beam indication 3] One TCI field codepoint represents only the UL TCI state. If the DCI indicates such a TCI field codepoint, the UE applies the corresponding UL TCI state and maintains the DL TCI state.

[0046] In the present disclosure, the terms TCI status pool, TCI status list, unified TCI status pool, joint TCI, joint TCI status pool, separate TCI status pool, separate DL / UL TCI status pool, DL TCI status pool, UL TCI status pool, separate DL TCI status pool, separate UL TCI status pool, and separate UL TCI may be read interchangeably.

[0047] (Beam Indication DCI for Unified TCI) For beam indication using the unified TCI of Rel. 17, it is being considered that the UE will support DCI format 1_1 / 1_2 (beam indication DCI) without DL assignment. The ACK / NACK mechanism for the beam indication may be similar to the ACK / NACK mechanism for SPS PDSCH release using Type 1 and Type 2 HARQ-ACK codebooks.

[0048] In response to successful reception of the beam indication DCI, the UE may report an ACK. In response to unsuccessful reception of the beam indication DCI, the UE may report a NACK.

[0049] For a Type 1 HARQ-ACK codebook, the location of the ACK information in the HARQ-ACK codebook may be determined based on the virtual PDSCH indicated by the TDRA field in the beam indication DCI, based on the time domain configuration list configured for the PDSCH. For a Type 2 HARQ-ACK codebook, the location of the ACK information in the HARQ-ACK codebook may be determined according to the same rules as those for SPS release.

[0050] The ACK may be reported in the PUCCH k slots after the end of the PDCCH reception, where k may be indicated by the PDSCH-to-HARQ feedback timing indication field in the DCI format, or if there is no PDSCH-to-HARQ feedback timing indication field in the DCI, k may be provided by dl-DataToUL-ACK or dl-DataToUL-ACK-ForDCIFormat1-2-r16.

[0051] If a DCI is used for beam direction, the CS-RNTI is used to scramble the CRC for that DCI, and the DCI fields may have the following values: RV = all '1' MCS = all '1' NDI = 0 All '0' for FDRA type 0, or all '1' for FDRA type 1, or all '0' for dynamicSwitch.

[0052] The following DCI fields may be used as in Rel. 16: Identifier for DCI formats, Carrier indicator, Bandwidth part indicator, TDRA, Downlink assignment index (if configured), TPC command for scheduled PUCCH, PUCCH resource indicator, and PDSCH-to-HARQ_feedback timing indicator (if present).

[0053] The remaining unused DCI fields and codepoints may be reserved in Rel. 17.

[0054] The UE may report whether it supports TCI updating via DCI format 1_1 / 1_2. A UE that supports TCI updating via DCI format 1_1 / 1_2 may be required to support TCI updating via DCI format 1_1 / 1_2 without DL assignment.

[0055] (Multi-TRP HARQ-ACK) Separate HARQ-ACK feedback and joint HARQ-ACK feedback are being considered as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) feedback for multi-PDSCH. In this disclosure, "separate" may be interchangeably read as "independent."

[0056] Separate HARQ-ACK feedback (also referred to as separate feedback or separate HARQ-ACK) corresponds to feedback in which the UE transmits HARQ-ACK for each TRP on separate Physical Uplink Control Channel (PUCCH) / Physical Uplink Shared Channel (PUSCH) resources. The PUCCH / PUSCH resources may overlap (be transmitted simultaneously) or may not overlap (e.g., be TDM / FDM).

[0057] Separate HARQ-ACK allows independent HARQ-ACK transmission for each TRP. Even if the backhaul delay between TRPs is large (e.g., the TRPs are connected by a non-ideal backhaul), the HARQ delay is not large.

[0058] Joint HARQ-ACK feedback (which may also be referred to as joint feedback, joint HARQ-ACK, etc.) corresponds to feedback in which the UE transmits HARQ-ACKs for multiple TRPs together on the same PUCCH / PUSCH resource.

[0059] Using joint HARQ-ACK, one PUCCH / PUSCH transmission is sufficient, reducing resource overhead. Also, if the backhaul delay between TRPs is small (e.g., the TRPs are connected by an ideal backhaul), the HARQ-ACK sent to one TRP can be delivered to the other TRP with low latency.

[0060] In Rel. 16 NR, the UE may configure the feedback mode by a higher layer parameter (which may be called "ackNackFeedbackMode", "ackNackFeedbackMode-r16", ACKNACK feedback mode, etc.) that indicates whether the feedback mode used within one slot is joint feedback or separate feedback.

[0061] One or more DCIs scheduling multi-PDSCH may include a PUCCH resource indicator (PRI) field. The PRI corresponds to information specifying a resource for transmitting a HARQ-ACK corresponding to the PDSCH, and may also be called an ACK / NACK resource indicator (ARI).

[0062] The UE may determine a PUCCH resource for transmitting a HARQ-ACK corresponding to the multi-PDSCH based on the PRI.

[0063] (HARQ-ACK Codebook) In NR, the UE may transmit HARQ-ACK feedback using one PUCCH resource in units of a HARQ-ACK codebook consisting of one or more bits of delivery confirmation information (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)). The HARQ-ACK bit may be referred to as HARQ-ACK information, HARQ-ACK information bit, etc.

[0064] Here, the HARQ-ACK codebook may be configured to include bits for HARQ-ACK in at least one unit of a time domain (e.g., slot), a frequency domain (e.g., component carrier (CC)), a spatial domain (e.g., layer), a transport block (TB), and a code block group (CBG) constituting a TB. The HARQ-ACK codebook may be simply referred to as a codebook.

[0065] The number of bits (size) included in the HARQ-ACK codebook may be determined semi-statically or dynamically. A HARQ-ACK codebook whose size is determined semi-statically is also called a semi-static HARQ-ACK codebook, a type 1 HARQ-ACK codebook, etc. A HARQ-ACK codebook whose size is determined dynamically is also called a dynamic HARQ-ACK codebook, a type 2 HARQ-ACK codebook, etc.

[0066] Whether to use the Type 1 HARQ-ACK codebook or the Type 2 HARQ-ACK codebook may be configured in the UE using a higher layer parameter (for example, pdsch-HARQ-ACK-Codebook).

[0067] In the case of a Type 1 HARQ-ACK codebook, the UE may feed back HARQ-ACK bits for PDSCH candidates (or PDSCH opportunities) corresponding to a certain range (e.g., a range set based on higher layer parameters), regardless of whether PDSCH is scheduled or not.

[0068] The range may be determined based on at least one of the following: a time period (e.g., a set of a certain number of candidate occasions for PDSCH reception or a certain number of PDCCH monitoring occasions), the number of CCs configured or activated in the UE, the number of TBs (number of layers or ranks), the number of CBGs per TB, whether spatial bundling is applied, etc. The range may also be referred to as a HARQ-ACK window, a HARQ-ACK bundling window, a HARQ-ACK feedback window, etc.

[0069] In the Type 1 HARQ-ACK codebook, even if a PDSCH is not scheduled for the UE, the UE reserves a bit for the PDSCH in the codebook within the above range. If the UE determines that the PDSCH is not actually scheduled, it can feed back the bit as a NACK bit.

[0070] For the Type 1 HARQ-ACK codebook, the DCI does not need to include a DAI because the HARQ-ACK codebook size is constant regardless of the reception of DCI / PDSCH. An index may be assigned to each HARQ-ACK bit (corresponding DCI / PDSCH) in the Type 1 HARQ-ACK codebook for one TRP. The indexes may be in ascending order of frequency (e.g., serving cell (CC) index). The indexes may be in ascending order of time (e.g., PDCCH monitoring occasion) for the same frequency.

[0071] On the other hand, in the case of a Type 2 HARQ-ACK codebook, the UE may feed back HARQ-ACK bits for scheduled PDSCHs within the above range.

[0072] Specifically, the UE may determine the number of bits of the Type 2 HARQ-ACK codebook based on a field in the DCI (e.g., a Downlink Assignment Indicator (Index) (DAI) field). The DAI field may include a Counter DAI (C-DAI) and a Total DAI (T-DAI).

[0073] The C-DAI may indicate a counter value of downlink transmissions (PDSCH, data, TB) scheduled within a certain period. For example, the C-DAI in a DCI that schedules data within the period may indicate the number counted first in the frequency domain (e.g., CC) and then in the time domain within the period. For example, the C-DAI may correspond to a value obtained by counting PDSCH receptions or semi-persistent scheduling (SPS) releases for one or more DCIs included in the period, in ascending order of serving cell index, and then in ascending order of PDCCH monitoring opportunities.

[0074] That is, C-DAI may refer to the cumulative number of pairs of {serving cell, PDCCH monitoring opportunity} corresponding to each data up to the current serving cell and the current PDCCH monitoring opportunity.

[0075] The T-DAI may indicate the total number of data scheduled within a certain period of time. For example, the T-DAI in a DCI that schedules data at a certain time unit (e.g., a PDCCH monitoring opportunity) within the period of time may indicate the total number of data scheduled up to that time unit (also referred to as a point, timing, etc.) within the period of time.

[0076] In other words, T-DAI may refer to the total number of {serving cell, PDCCH monitoring opportunity} pairs corresponding to each data up to the current PDCCH monitoring opportunity, and may be a value that is updated for each PDCCH monitoring opportunity.

[0077] For a Type 2 HARQ-ACK codebook, the DCI includes the DAI, allowing the base station and the UE to share a common understanding of the HARQ-ACK codebook size. Each HARQ-ACK bit (corresponding DCI / PDSCH) in the Type 2 HARQ-ACK codebook for one TRP may be indexed. The indexes may be in ascending order of time (e.g., PDCCH monitoring occasion). For the same time, the indexes may be in ascending order of frequency (e.g., serving cell (CC) index).

[0078] Incidentally, in Rel. 16 NR, which has been considered so far, CORESETs with different CORESET pool indices are used to schedule different PDSCHs (multi-DCI-based multi-TRP).

[0079] For this reason, Rel. 16 NR specifies that when the above-mentioned first CORESET and second CORESET are configured in a UE and separate feedback is configured ("ackNackFeedbackMode-r16"="separate"), the UE generates / reports HARQ-ACK information related to the first CORESET and HARQ-ACK information related to the second CORESET separately for the Type-1 and Type-2 HARQ-ACK codebooks.

[0080] In the present disclosure, the terms "first TRP," "TRP1," "first CORESET," and "CORESET with no CORESET pool index or with a CORESET pool index value of 0" may be interchangeable. Also, the term "first CORESET" may refer to one or more first CORESETs.

[0081] In the present disclosure, the terms "second TRP," "TRP2," "second CORESET," and "CORESET provided with a CORESET pool index value of 1" may be interchangeable. Also, the term "second CORESET" may refer to one or more second CORESETs.

[0082] On the other hand, the two CORESETs associated with the two linked SS sets (also referred to as "two linked CORESETs for PDCCH repetition" in this disclosure) are used for repeated transmission of the same DCI payload. In other words, the two linked CORESETs may be used to schedule the same PDSCH.

[0083] (PUCCH Resource Determination for HARQ-ACK Information) For a PUCCH with HARQ-ACK information, the UE determines the PUCCH resource set for the number of HARQ-ACK information bits and then determines the PUCCH resource. The PUCCH resource determination is based on the PUCCH resource indicator field in the last DCI format among multiple specific DCI formats, if there are multiple specific DCI formats. The multiple specific DCI formats are DCI formats with values ​​of the PDSCH-to-HARQ_feedback timing indicator field indicating the same slot for PUCCH transmission, or DCI formats with values ​​of dl-DataToUL-ACK, dl-DataToUL-ACK-r16, or dl-DataToUL-ACKForDCIFormat1-2, which the UE detects and for transmitting the corresponding HARQ-ACK information in the PUCCH. In PUCCH resource determination, detected specific DCI formats are first indexed in ascending order of serving cell index for the same PDCCH monitoring occasion, and then indexed in ascending order of PDCCH monitoring occasion index. In indexing multiple DCI formats in one serving cell for the same PDCCH monitoring occasion index, if a UE is provided with no CORESET pool index or a CORESET pool index with value 0 for one or more first CORESETs on an active DL BWP of one serving cell, and is provided with a CORESET pool index with value 1 for one or more second CORESETs, and with ackNackFeedbackMode=joint for the active UL BWP, the DCI formats detected from PDCCH reception in the first CORESET are indexed before the DCI formats detected from PDCCH reception in the second CORESET.

[0084] (Beam Application Time (BAT)) In DCI-based beam indication in Rel. 17, the following considerations 1 and 2 are considered regarding the application time (BAT) of the beam / unified TCI status indication.

[0085] [Consideration 1] It is considered that the first slot to apply the indicated TCI is at least Y symbols after the last symbol of the acknowledgement (ACK) for the joint or separate DL / UL beam indication (FIG. 2). It is considered that the first slot to apply the indicated TCI is at least Y symbols after the last symbol of the ACK / negative acknowledgement (NACK) for the joint or separate DL / UL beam indication. Y symbols may be set by the base station based on the UE capability. The UE capability may be reported in symbol units.

[0086] According to Study 1, the BAT is determined based on the Y symbol, but if the SCS differs among multiple CCs, the value of the Y symbol also differs, and therefore the BAT differs among multiple CCs.

[0087] [Consideration 2] For the CA case, the application time of the beam instruction may follow any of the following options 1 to 3: [Option 1] Both the first slot and Y symbol are determined on the carrier with the smallest SCS among the one or more carriers to which the beam instruction is applied. [Option 2] Both the first slot and Y symbol are determined on the carrier with the smallest SCS among the one or more carriers to which the beam instruction is applied and the UL carrier carrying the ACK. [Option 3] Both the first slot and Y symbol are determined on the UL carrier carrying the ACK.

[0088] As part of the CC simultaneous beam update function of Rel. 17, sharing beams among multiple CCs in CA is being considered. According to Study 2, the BAT will be shared among multiple CCs.

[0089] However, when a UE receives multiple DCIs related to the TCI status, it is unclear how to determine the TCI status based on the multiple DCIs. If the operation for the multiple DCIs is unclear, communication throughput may be reduced.

[0090] Therefore, the present inventors have conceived a method for appropriately determining the TCI state based on multiple DCIs.

[0091] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0092] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0093] In the present disclosure, terms such as activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0094] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0095] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0096] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0097] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0098] In the present disclosure, the terms index, identifier (ID), indicator, resource ID, etc. may be interchangeable. In the present disclosure, the terms sequence, list, set, group, cluster, subset, etc. may be interchangeable.

[0099] In the present disclosure, the terms panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmitting entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relation, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), antenna port (e.g., Demodulation Reference Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relation group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resource (e.g., reference signal resource, SRS resource), resource set (e.g., reference signal resource set), CORESET pool, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumption, etc. may be read as interchangeable.

[0100] In the present disclosure, the terms TCI state, common TCI state, unified TCI state, TCI state applicable to DL and UL, TCI state applicable to multiple (multiple types) channels / RS, TCI state applicable to multiple types of channels / RS, joint TCI state for DL ​​and UL, TCI state for UL and DL for joint TCI indication, separate TCI state for DL / UL, UL-only TCI state for separate TCI indication, and DL-only TCI state for separate TCI indication may be interpreted as interchangeable.

[0101] In the present disclosure, multiple TCI states configured by RRC, multiple TCI states activated by MAC CE, pool, TCI state pool, active TCI state pool, common TCI state pool, joint TCI state pool, separate TCI state pool, common TCI state pool for UL, common TCI state pool for DL, common TCI state pool configured / activated by RRC / MAC CE, and TCI state information may be read interchangeably.

[0102] In the present disclosure, the channels / RS to which the unified TCI is applied may be PDCCH / PDSCH / HARQ-ACK information / PUCCH / PUSCH / CSI-RS / SRS.

[0103] In the present disclosure, beam indication, beam indication DCI, TCI (status) indication DCI, and DCI with TCI indication (field) may be read interchangeably.

[0104] (Wireless Communication Method) In each embodiment, the unified TCI may be simply referred to as a TCI state. In other words, the TCI state in each embodiment may be applied to one or more types of channels / RSs.

[0105] In each embodiment, HARQ-ACK information corresponding to a DCI, an ACK corresponding to a DCI, an UL transmission scheduled / triggered by a DCI, HARQ-ACK information corresponding to a PDSCH scheduled by a DCI, and an UL transmission at an UL transmission timing indicated by a DCI may be interchangeable. In each embodiment, UL transmission, HARQ-ACK information, ACK, PUCCH / PUSCH / SRS may be interchangeable.

[0106] In each embodiment, the DCI format with a TCI field (specific DCI) may be a DCI format in which a TCI field is present (configured) among the designated DCI formats. In each embodiment, the DCI format without a TCI field may be a DCI format other than the designated DCI format with a TCI field, may include DCI format 1_0, or may include a designated DCI format without a TCI field. The designated DCI format may include DCI format 1_1 / 1_2, a group-common DCI format (e.g., DCI format 2_x), or an UL grant DCI format (e.g., DCI format 0_x). The designated DCI format may be at least one of a DCI format with a DL assignment and a DCI format without a DL assignment.

[0107] In each embodiment, the DCI format with the TCI field, the DCI format indicating the TCI state, the beam indication DCI, and the specific DCI may be interchangeable. In each embodiment, the target DCI may be one or more specific DCIs.

[0108] In each embodiment, the UE may apply the TCI state after a specific timing based on the target DCI indicating the TCI state, which may be Y symbols after reception of the target DCI, Y symbols after the last symbol of reception of the target DCI, the first slot at least Y symbols after the last symbol of reception of the target DCI, the first slot at least Y symbols after the last symbol of transmission of an ACK for the target DCI, the first slot at least Y symbols after the last symbol of transmission of an ACK / NACK for the target DCI, or the first slot at least Y symbols after the last symbol of UL transmission for the target DCI.

[0109] First Embodiment This embodiment relates to HARQ-ACK information for multiple DCIs (specific DCIs / target DCIs) indicating beam / TCI status.

[0110] In the existing specifications, a UE reports a HARQ-ACK for a PDSCH triggered by DCI format 1_1 / 1_2. However, when a UE reports a NACK, the base station cannot distinguish whether the NACK is due to a failure in decoding the PDSCH or a failure in decoding the PDCCH (DCI). Therefore, it is preferable to introduce a mechanism for ACK for a TCI update DCI.

[0111] All UE actions regarding a DCI can be considered as an ACK for the DCI. If the DCI triggers aperiodic SRS transmission and the UE transmits the SRS, the base station can assume that the DCI has been received, regardless of whether the UE reports an ACK or a NACK. Furthermore, it is not necessary to trigger multiple TCI update signaling for multiple DL slots corresponding to a HARQ codebook. Therefore, a bit may be added to the HARQ codebook to indicate whether the UE has received a TCI update signaling for the corresponding DL slots.

[0112] 3A and 3B, the UE transmits the HARQ-ACK codebook for DL ​​in slots #0 to #3 in slot #7. In the example of FIG. 3A, the UE starts from a state of TCI=0, fails to decode DCI indicating TCI=0 in slot #0 (NACK), fails to detect DCI indicating TCI=1 in slot #1 (discontinuous transmission (DTX, no response / no transmission)), successfully decodes DCI indicating TCI=1 in slot #2 (ACK), and successfully decodes DCI indicating TCI=1 in slot #3 (ACK). In this case, the UE determines the HARQ-ACK codebook {0011} corresponding to slots #0 to #3, respectively. Because the TCI is updated from 0 to 1 in slots #0 to #3, the UE reports the HARQ-ACK codebook {00111} obtained by adding a bit {1} indicating that the TCI is updated in slots #0 to #3 to the HARQ-ACK codebook in slot #7. In the example of Figure 3B, the UE, from a state in which TCI = 0, fails to decode the DCI indicating TCI = 0 in slot #0 (NACK), successfully decodes the DCI indicating TCI = 0 in slot #1 (ACK), fails to detect the DCI indicating TCI = 1 in slot #2 (DTX), and fails to detect the DCI indicating TCI = 1 in slot #3 (DTX). In this case, the UE determines the HARQ-ACK codebook {0100} corresponding to slots #0 to #3, respectively. Since the TCI is not updated in slots #0 to #3, the UE reports in slot #7 the HARQ-ACK codebook {01000} obtained by adding bit {0} to the HARQ-ACK codebook, which indicates that the TCI is not updated in slots #0 to #3.

[0113] The UE may be specified to assume that the base station updates the TCI at most once in the multiple DL slots corresponding to the HARQ codebook. An additional bit may be introduced in the HARQ codebook to indicate whether the UE received a TCI update in the multiple DL slots corresponding to the HARQ codebook. If the DCI for updating the TCI triggers aperiodic SRS, the additional bit may not be reported. Therefore, whether the UE transmits SRS may be used to determine the HARQ-ACK for that DCI.

[0114] In the above discussion 1, the ACK / NACK for the joint or separate DL / UL beam indication may be an ACK carried by a PUCCH / PUSCH based on the beam indication DCI, or may be an UL channel / UL signal (e.g., PUSCH / PUCCH / SRS) based on the beam indication DCI. The base station may determine the ACK / NACK for the beam indication DCI based on the UL channel / UL signal based on the beam indication DCI.

[0115] According to this embodiment, the base station can properly recognize the ACK / NACK of the beam instruction DCI.

[0116] Second Embodiment This embodiment relates to the case where multiple DCIs indicate the beam / TCI state.

[0117] When a UE transmits multiple ACKs for multiple PDSCHs based on multiple specific DCIs together on one PUSCH / PUCCH, it is unclear which of the multiple ACKs the UE should follow the TCI indication of the DCI corresponding to the ACK. The UE may select / determine one of the multiple specific DCIs (target DCI) by considering at least one of the following: the magnitude relationship of time-domain resources / indexes, the magnitude relationship of frequency-domain resources / indexes, and the magnitude relationship of TRP / CORESET pool indices.

[0118] The UE may index multiple DCIs (beam indication DCIs) according to a specific parameter and select / determine the last DCI at that index (the TCI status in that DCI may be used for indication / updating). The specific parameter may be at least one of the following parameters corresponding to each DCI: Bit position in semi-static (type 1) / dynamic (type 2) HARQ-ACK codebook Index for determining the last DCI for PUCCH resource determination Time (e.g., PDCCH monitoring occasion) Frequency (e.g., serving cell index) TRP (e.g., TRP ID / CORESET pool index)

[0119] In indexing, a priority of specific parameters may be defined, which may be one of the following: time, frequency, TRP; time, TRP, frequency; frequency, time, TRP; frequency, TRP, time; TRP, time, frequency; TRP, frequency, time.

[0120] If the order of priority is first parameter, second parameter, third parameter, multiple DCIs are indexed in ascending or descending order of the first parameter. Multiple DCIs with the same value of the first parameter are indexed in ascending or descending order of the second parameter. Multiple DCIs with the same value of the first parameter and the same value of the second parameter are indexed in ascending or descending order of the third parameter. For example, multiple DCIs are indexed in ascending order of frequency (e.g., serving cell index), multiple DCIs with the same value of frequency are indexed in ascending order of time (e.g., PDCCH monitoring occasion index), and multiple DCIs with the same value of frequency and the same value of time are indexed in ascending order of TRP (e.g., CORESET pool index).

[0121] The UE may index multiple PDSCHs based on multiple DCIs according to a specific parameter, and select / determine the DCI corresponding to the last PDSCH at that index (the TCI status in that DCI may be used for indication / updating). The specific parameter corresponding to the DCI may be used as the specific parameter corresponding to each PDSCH. In the indexing, priorities of multiple specific parameters may be defined. The priorities of the specific parameters for the indexing of the DCI may be used as the priorities of the specific parameters for the indexing of the PDSCH.

[0122] The specific DCI may be at least one of DCIs 1 to 4 below.

[0123] [DCI1] DCI1 may be DCI format 1_1 / 1_2 with a TCI field and a DL assignment, or may be a DCI format that satisfies at least one of the following conditions 1-1 to 1-3: [Condition 1-1] The HARQ for the PDSCH scheduled by the DCI is ACK. [Condition 1-2] The HARQ for the PDSCH scheduled by the DCI is NACK. [Condition 1-3] The HARQ for the PDSCH scheduled by the DCI is DTX. The HARQ may be transmitted as NACK.

[0124] [DCI2] DCI2 may be DCI format 1_1 / 1_2 with a TCI field but without a DL assignment, or may be a DCI format that satisfies at least one of the following conditions 2-1 to 2-3: [Condition 2-1] The HARQ for the PDSCH scheduled by this DCI is ACK. [Condition 2-2] The HARQ for the PDSCH scheduled by this DCI is NACK. [Condition 2-3] The HARQ for the PDSCH scheduled by this DCI is DTX. The HARQ may be transmitted as NACK.

[0125] [DCI3] DCI3 may be one or more DCI formats that are accompanied by a TCI field and trigger / schedule SRS / CSI / PUSCH.

[0126] [DCI4] DCI4 may be one or more DCI formats without a TCI field, or may be a DCI format that satisfies at least one of the following conditions 4-1 to 4-4. DCI4 may be a DCI format other than DCI format 1_1 / 1_2 with a TCI field. For example, DCI4 may be DCI format 1_0 and DCI format 1_1 / 1_2 without a TCI field. [Condition 4-1] The HARQ for the PDSCH scheduled by this DCI is ACK. [Condition 4-2] The HARQ for the PDSCH scheduled by this DCI is NACK. [Condition 4-3] The HARQ for the PDSCH scheduled by this DCI is DTX. The HARQ may be transmitted as NACK. [Condition 4-4] SRS / CSI / PUSCH are transmitted by this DCI.

[0127] For example, the specific DCI may be a DCI corresponding to an ACK (at least one of DCI1 satisfying condition 1-1, DCI2 satisfying condition 2-1, DCI3, and DCI4 satisfying condition 4-1). In this case, the reliability of the beam instruction DCI can be improved.

[0128] FIG. 4 shows an example in which a specific DCI includes a TCI field and corresponds to an ACK (at least one of DCI1 satisfying condition 1-1 and DCI2 satisfying condition 2-1), and the specific parameter includes time. Slots #0 to #5 may be DL slots. Slots #6 to #7 may be UL slots. The four DCIs in slots #0 to #3 may schedule four PDSCHs, respectively. In this example, the UE transmits a HARQ-ACK codebook for DL ​​in slots #0 to #3 in slot #7. In this example, the UE successfully decodes a DCI with a TCI field in slot #0 (ACK), successfully detects a DCI with a TCI field in slot #1 (ACK), fails to decode a DCI without a TCI field in slot #2 (NACK), and successfully decodes a DCI without a TCI field in slot #3 (ACK). In this case, the UE may determine / update the TCI status based on the TCI field of the DCI in slot #1.

[0129] According to this embodiment, even when multiple DCIs indicate beams, the UE can appropriately determine the DCI / beam.

[0130] Third Embodiment This embodiment relates to a TCI field in a DCI format with a TCI field (a DCI format indicating a beam / TCI state). In this embodiment, the second embodiment may not be applied.

[0131] When a UE transmits multiple ACKs for multiple PDSCHs based on multiple specific DCIs together in one PUSCH / PUCCH, the base station may assume that all TCI fields of the multiple specific DCIs (target DCIs) indicate a common (same) value.When a base station receives multiple ACKs for multiple PDSCHs based on multiple specific DCIs together in one PUSCH / PUCCH, all TCI fields of the multiple specific DCIs may indicate a common (same) value.

[0132] Figure 5 shows an example in which all TCI fields of multiple specific DCIs indicate the same value. Slots #0 to #5 may be DL slots. Slots #6 to #7 may be UL slots. The four DCIs in slots #0 to #3 may schedule four PDSCHs, respectively. In this example, the UE transmits a HARQ-ACK codebook for the DLs in slots #0 to #3 in slot #7. In this example, the UE successfully decodes the DCI with the TCI field in slot #0 (ACK), successfully detects the DCI with the TCI field in slot #1 (ACK), fails to decode the DCI without the TCI field in slot #2 (NACK), and successfully decodes the DCI without the TCI field in slot #3 (ACK). All TCI fields of the four DCIs in slots #0 to #3 indicate the same value, 010. In this case, the UE may determine / update the TCI status based on the TCI field of either of the successfully decoded DCIs (slots #0 and #1).

[0133] According to this embodiment, even when multiple DCIs indicate beams, the UE can appropriately determine the DCI / beam.

[0134] <Effects> According to the second embodiment, the base station can flexibly issue TCI instructions compared to the third embodiment. For example, the base station can issue a TCI state #1 instruction using DCI #1, and then update the TCI state to #2 using another DCI #1. This reduces the delay in beam instruction.

[0135] According to the third embodiment, the processing load on the UE is smaller than that of the second embodiment. When the UE transmits both HARQ-ACK information of DCI #1 and the subsequent DCI #2 on a common PUCCH / PUSCH, the base station cannot update the TCI state #1 to TCI state #2 by DCI #2 after indicating TCI state #1 by DCI #1. If such an update were to be performed, the base station would not know which DCI's TCI indication the UE would follow to update the TCI state, which could cause a discrepancy in the assumptions of the TCI state between the UE and the base station, resulting in subsequent transmission and reception not being performed properly (for example, beam failure).

[0136] In a third embodiment, when a UE transmits multiple HARQ-ACK information pieces on a common PUCCH / PUSCH, the base station does not update the TCI state until it transmits a DCI corresponding to another PUCCH / PUSCH transmission occasion. The base station does not indicate a TCI state in a subsequent DCI in the multiple DCIs corresponding to one PUCCH / PUSCH that is different from the TCI state indicated by a DCI in the multiple DCIs corresponding to one PUCCH / PUSCH. The UE does not need to assume that a TCI state in a subsequent DCI in the multiple DCIs corresponding to one PUCCH / PUSCH that is different from the TCI state indicated by a DCI in the multiple DCIs corresponding to one PUCCH / PUSCH is indicated.

[0137] In the example of Figures 6A and 6B, slots 0 to 5 may be DL slots. Slots 6 to 7 may be UL slots. Four DCIs in slots 0 to 3 may schedule four PDSCHs, respectively. The UE transmits a HARQ-ACK codebook for DL ​​in slots 0 to 3 in slot 7. In this example, the UE successfully decodes a DCI with a TCI field in slot 0 (ACK), successfully detects a DCI with a TCI field in slot 1 (ACK), fails to decode a DCI without a TCI field in slot 2 (NACK), and successfully decodes a DCI without a TCI field in slot 3 (ACK). In the example of Figure 6A, the value of the TCI field in the DCI in slot 0 is 010, and the value of the TCI field in the DCI in slot 1 is also 010. The UE may apply a TCI field value of 010 in slots at least Y symbols after the last symbol of the transmission of HARQ-ACK information in slot #7. In the example of Figure 6B, the value of the TCI field in the DCI in slot #0 is 000, and the value of the TCI field in the DCI in slot #1 is also 000. The UE may apply a TCI field value of 000 in slots at least Y symbols after the last symbol of the transmission of HARQ-ACK information in slot #7.

[0138] <Fourth embodiment> This embodiment relates to an operation for a DCI that does not update the TCI state.

[0139] When a UE receives a DCI (specific DCI / target DCI) instructing a TCI state update, the UE may apply the TCI state from a specific timing based on the reception of the DCI. The specific timing may be Y symbols after the reception of the DCI, Y symbols after the last symbol of the reception of the DCI, the first slot at least Y symbols after the last symbol of the reception of the DCI, the first slot at least Y symbols after the last symbol of the transmission of an ACK for the DCI, the first slot at least Y symbols after the last symbol of the transmission of an ACK / NACK for the DCI, or the first slot at least Y symbols after the last symbol of the UL transmission for the target DCI.

[0140] When a UE receives multiple DCIs indicating the TCI status, not all DCIs indicate a TCI status update. If one DCI does not indicate a TCI status update, the question arises as to how the UE should behave.

[0141] A DCI that does not indicate a TCI state update (e.g., a DCI indicating the same TCI state as the last indicated TCI state) may indicate the last indicated TCI state. In the example of Figure 7, DCI #1 to DCI #5 are transmitted in chronological order. DCI #1 to #5 indicate TCI #0, #0, #1, #1, and #1, respectively. That is, DCI #3 indicates an update / change of the TCI state. The subsequent DCIs #4 and #5 may indicate the changed TCI state. During the period from the reception of DCI #3 to a specific timing, the current TCI state actually applied is different from the last indicated TCI state. Even if the UE fails to decode DCI #3, it can apply the appropriate TCI state if it can receive subsequent DCIs.

[0142] One or more code points in the TCI field may indicate that the TCI state is not changed / updated. For example, if a maximum of M TCI states are activated, and M is less than the number of TCI states that can be indicated by the TCI field (the number of candidates, e.g., if the TCI field size is 3 bits, the number of TCI states is 8), a specific code point may mean "no change" (reserved value, inapplicable value, invalid value, value that is not a TCI state ID, or value out of range). Figure 8 shows an example of the association between code points (values) in the TCI field and TCI states. In this example, M is 5, and the five code points 000 to 100 are associated with TCI states #1 to #5, respectively. The remaining three code points 101 to 111 each mean "no change (no update)."

[0143] According to this embodiment, even if the DCI does not update the TCI status, the UE can still apply the appropriate TCI status.

[0144] <Other Embodiments> <UE Capability Information / Higher Layer Parameter> Higher layer parameters (RRC IEs) / UE capabilities corresponding to the functions (features) in the above embodiments may be defined. The higher layer parameters may indicate whether the functions are enabled. The UE capabilities may indicate whether the UE supports the functions.

[0145] A UE configured with higher layer parameters corresponding to the function may perform the function. It may also be specified that "a UE not configured with higher layer parameters corresponding to the function shall not perform the function (for example, in accordance with Rel. 15 / 16)."

[0146] A UE that has reported / transmitted a UE capability indicating that it supports the feature may perform the feature. It may also be specified that a UE that has not reported a UE capability indicating that it supports the feature shall not perform the feature (e.g., in accordance with Rel. 15 / 16).

[0147] If the UE reports / transmits a UE capability indicating that it supports the function and the corresponding higher layer parameters are configured, the UE may perform the function. It may also be specified that "if the UE does not report / transmit a UE capability indicating that it supports the function or if the corresponding higher layer parameters are not configured, the UE shall not perform the function (e.g., in accordance with Rel. 15 / 16)."

[0148] Which embodiment / option / choice / function is used among the above multiple embodiments may be configured by higher layer parameters, may be reported by the UE as a UE capability, may be specified in a specification, or may be determined by the reported UE capability and the configuration of higher layer parameters.

[0149] The UE capabilities may indicate whether it supports at least one of the following features: Unified TCI framework, Joint TCI and / or Separate TCI, and Dynamic Unified TCI status indication by DCI, which may include DCI format 1_1 / 1_2 with DL assignment or DCI format 1_1 / 1_2 without DL assignment.

[0150] The UE capability may indicate at least one of the following values: Number of configured TCI states per BWP / per CC / per band / per UE (maximum number); Number of active TCI states per BWP / per CC / per band / per UE (maximum number); Y [symbols] for BAT.

[0151] The above UE capabilities / higher layer parameters allow the UE to achieve the above functions while maintaining compatibility with existing specifications.

[0152] (Wireless Communication System) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0153] 9 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0154] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0155] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0156] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0157] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0158] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0159] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

[0160] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0161] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0162] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0163] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0164] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0165] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0166] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0167] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), or the like may be used as an uplink channel.

[0168] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0169] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0170] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0171] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0172] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0173] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0174] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0175] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0176] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0177] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0178] (Base Station) Fig. 10 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0179] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0180] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0181] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0182] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0183] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0184] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0185] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0186] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0187] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0188] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0189] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0190] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

[0191] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0192] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0193] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0194] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0195] The transceiver 120 may transmit a plurality of downlink control information formats, each of which includes a transmission configuration indication (TCI) state indication, and the controller 110 may apply the TCI state indicated by one of the plurality of downlink control information formats at a specific timing after transmission of the plurality of downlink control information formats.

[0196] (User Terminal) Fig. 11 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0197] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0198] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0199] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0200] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0201] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0202] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0203] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0204] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0205] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0206] The transmitter / receiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0207] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0208] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0209] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0210] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0211] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0212] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0213] The transceiver 220 may receive a plurality of downlink control information formats (e.g., specific DCIs), each including a transmission configuration indication (TCI) state indication, and the controller 210 may apply the TCI state indicated by one of the plurality of downlink control information formats (e.g., a target DCI) at a specific timing after receiving the plurality of downlink control information formats.

[0214] The plurality of downlink control information formats may indicate the same uplink transmission timing. A plurality of indexes may be assigned to the plurality of downlink control information formats, respectively. The one downlink control information format may correspond to a last index of the plurality of indexes.

[0215] The plurality of downlink control information formats may correspond to an acknowledgement (ACK) at the uplink transmission timing.

[0216] The plurality of downlink control information formats may indicate the same uplink transmission timing. The plurality of downlink control information formats may indicate the same value of TCI state.

[0217] (Hardware Configuration) Note that the block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0218] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0219] For example, a base station, a user terminal, or the like according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 12 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0220] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0221] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0222] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0223] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0224] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0225] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0226] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0227] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0228] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0229] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0230] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0231] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0232] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0233] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0234] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0235] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0236] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0237] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0238] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0239] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0240] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0241] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0242] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0243] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0244] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may be composed of one or more resource blocks.

[0245] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0246] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0247] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0248] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0249] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0250] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0251] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0252] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0253] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0254] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0255] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0256] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0257] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0258] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0259] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0260] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0261] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), these wired and / or wireless technologies are included within the definition of transmission media.

[0262] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0263] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0264] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0265] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0266] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0267] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0268] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0269] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0270] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0271] 13 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0272] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0273] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0274] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0275] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0276] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0277] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0278] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0279] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0280] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0281] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0282] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0283] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0284] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0285] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0286] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0287] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0288] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0289] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0290] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0291] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0292] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "deciding" some action.

[0293] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0294] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0295] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0296] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0297] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0298] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0299] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0300] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

[0301] This application is based on Japanese Patent Application No. 2021-166799, filed on October 11, 2021, the contents of which are incorporated herein in their entirety.

Claims

1. a receiver for receiving a plurality of downlink control information formats, each of the formats including a transmission configuration indication (TCI) status indication; a control unit that applies a TCI state indicated by one of the plurality of downlink control information formats at a specific timing after reception of the plurality of downlink control information formats, the plurality of downlink control information formats indicate the same uplink transmission timing; the plurality of downlink control information formats correspond to acknowledgments (ACKs) at the uplink transmission timing; the plurality of downlink control information formats are respectively associated with a plurality of indexes based on PDCCH monitoring occasions and serving cell indexes; The one downlink control information format corresponds to the last index of the plurality of indexes.

2. The terminal described in claim 1, wherein the multiple downlink control information formats include a downlink control information format that includes a TCI field but does not include a downlink link assignment.

3. A terminal as described in claim 1, wherein the specific timing is determined on a carrier with the smallest subcarrier spacing among multiple carriers to which the TCI state applies.

4. receiving a plurality of downlink control information formats, each of which includes a transmission configuration indication (TCI) status indication; applying a TCI state indicated by one of the plurality of downlink control information formats at a specific timing after receiving the plurality of downlink control information formats; the plurality of downlink control information formats indicate the same uplink transmission timing; the plurality of downlink control information formats correspond to acknowledgments (ACKs) at the uplink transmission timing; the plurality of downlink control information formats are respectively associated with a plurality of indexes based on PDCCH monitoring occasions and serving cell indexes; The wireless communication method for a terminal, wherein the one downlink control information format corresponds to a last index of the plurality of indexes.

5. a transmitter for transmitting a plurality of downlink control information formats, each of the formats including a transmission configuration indication (TCI) status indication; a control unit that applies a TCI state indicated by one of the plurality of downlink control information formats at a specific timing after transmission of the plurality of downlink control information formats, the plurality of downlink control information formats indicate the same uplink transmission timing; the plurality of downlink control information formats correspond to acknowledgments (ACKs) at the uplink transmission timing; the plurality of downlink control information formats are respectively associated with a plurality of indexes based on PDCCH monitoring occasions and serving cell indexes; The base station, wherein the one downlink control information format corresponds to a last index of the plurality of indexes.

6. A system comprising a terminal and a base station, The terminal a receiver for receiving a plurality of downlink control information formats, each of the formats including a transmission configuration indication (TCI) status indication; a control unit that applies a TCI state indicated by one of the plurality of downlink control information formats at a specific timing after reception of the plurality of downlink control information formats, the plurality of downlink control information formats indicate the same uplink transmission timing; the plurality of downlink control information formats correspond to acknowledgments (ACKs) at the uplink transmission timing; the plurality of downlink control information formats are respectively associated with a plurality of indexes based on PDCCH monitoring occasions and serving cell indexes; the one downlink control information format corresponds to a last index of the plurality of indexes; The base station transmits the plurality of downlink control information formats.