Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is characterized by being provided with: a reception unit that receives first downlink control information (DCI) for scheduling a signal corresponding to a transmission opportunity of hybrid automatic repeat request acknowledgement (HARQ-ACK), and second DCI for a beam indication corresponding to the transmission opportunity; and a control unit that determines, on the basis of a first transmission setting indication (TCI) field included in the first DCI, a first TCI state to be applied to the signal, determines, on the basis of a second TCI field included in the second DCI, a second TCI state to be applied after a specific period has elapsed from a final symbol of the transmission opportunity, and determines, on the basis of a second TCI field included in the second DCI, a second TCI state to be applied to the signal after a specific period has elapsed. Each of the first TCI state and the second TCI state is a TCI state applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state applied to a DL signal and a TCI state applied to an UL signal. According to one embodiment of the present disclosure, it is possible to appropriately perform TCI status indication.

Description

Technical Field

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

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rates and low latency (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further increasing the capacity and sophistication of LTE (Release (Rel.) 8, 9 of the Third Generation Partnership Project (3GPP)).

[0003] Successor systems of LTE (for example, also known as the fifth generation mobile communication system (5G), 5G+(plus), the sixth generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (e.g., NR), research is underway to control the transmission and reception processing of user terminals (terminal, user terminal, User Equipment (UE)) based on information related to Quasi-Co-Location (QCL) (QCL assumption / Transmission Configuration Indication (TCI) status / spatial relationship).

[0009] The application of the set / activated / indicated TCI state to various signals (channels / RS) is under study. However, there are cases where the indication / application method of the TCI state is unclear. If the indication method of the TCI state is unclear, there is a concern that it may lead to reduced communication quality and reduced throughput.

[0010] Therefore, the purpose of the present disclosure is to provide a terminal, a wireless communication method and a base station that appropriately perform TCI status indication.

[0011] Means for solving problems

[0012] A terminal involved in one embodiment of the present invention is characterized in that it has: a receiving unit that receives a first downlink control information (DCI) for a signal corresponding to a transmission opportunity for scheduling a hybrid automatic repeat request acknowledgment (HARQ-ACK) and a second DCI for a beam indication corresponding to the transmission opportunity; and a control unit that determines a first TCI state applied to the signal based on a first transmission configuration indication (TCI) field included in the first DCI, and determines a second TCI state to be applied after a specific period has passed from the last codeword of the transmission opportunity based on a second TCI field included in the second DCI, each of the first TCI state and the second TCI state being a TCI state applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state applied to a DL signal and a TCI state applied to a UL signal.

[0013] Effects of the Invention

[0014] According to one embodiment of the present disclosure, TCI status indication can be appropriately performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A as well as Figure 1B This is a diagram showing an example of communication between a mobile object and a transmission point (for example, RRH).

[0016] FIG. 2A to FIG. 2C This is a diagram showing an example of schemes 0 to 2 related to SFN.

[0017] Figure 3A as well as Figure 3B This is a diagram showing an example of scheme 1.

[0018] FIG. 4A to FIG. 4C This is a diagram showing an example of a Doppler pre-compensation scheme.

[0019] Figure 5 This is a diagram showing an example of simultaneous beam updating across multiple CCs.

[0020] Fig. 6A as well as Figure 6B This is a diagram showing an example of a common beam.

[0021] Figure 7 This is a diagram showing an example of BAT defined in Rel.17.

[0022] Figure 8 This is a diagram showing an example of the application of the TCI state when receiving multiple beam indication DCIs.

[0023] Fig. 9A as well as Fig. 9B The figures respectively represent an example of multi-TRP transmission based on single DCI and multi-TRP transmission based on multiple DCI.

[0024] Fig. 10A as well as Fig. 10B This is a diagram showing an example of the TCI field in DCI.

[0025] Fig.11A as well as Fig. 11B This is a diagram showing an example of setting / indicating the joint TCI state in multiple TRPs based on a single DCI.

[0026] Fig. 12A as well as Fig. 12B This is a diagram showing an example of setting / indicating a separate TCI state in multiple TRPs based on a single DCI.

[0027] Fig.13A as well as Fig. 13B This is a diagram showing an example of setting / indicating a joint TCI state corresponding to a CORESET pool index of a first value in a multi-TRP based on multi-DCI.

[0028] Fig.14A as well as Fig. 14BThis is a diagram showing an example of setting / indicating a joint TCI state corresponding to a CORESET pool index of a second value in a multi-TRP based on multi-DCI.

[0029] Figures 15A-15D This is a diagram showing an example of an indication of the TCI status involved in option 1-A / 1-B.

[0030] Fig.16 This is a diagram showing an example of application of the TCI state involved in the first embodiment.

[0031] Fig.17 This is a diagram showing an example of an indication of a TCI state according to a modification of the first embodiment.

[0032] Fig.18 This is a diagram showing another example of the indication of the TCI state involved in the modification example of the first embodiment.

[0033] Fig.19 This is a diagram showing another example of the indication of the TCI state involved in the modification example of the first embodiment.

[0034] Fig. 20 This is a diagram showing an example of the DCI field involved in the second embodiment.

[0035] Figure 21A-Figure 21D This is a diagram showing an example of switching between a single TRP and multiple TRPs involved in the second embodiment.

[0036] Fig. 22 This is a diagram showing an example of dynamic switching of the size of DCI involved in the second embodiment.

[0037] Fig.23 This is a diagram showing an example of switching between single / multiple TRP modes involved in the second embodiment.

[0038] Fig.24 This is a diagram showing another example of switching between single / multiple TRP modes involved in the second embodiment.

[0039] Fig.25 This is a diagram showing another example of switching between single / multiple TRP modes involved in the second embodiment.

[0040] Fig.26 This is a diagram showing another example of switching between single / multiple TRP modes involved in option 2-2.

[0041] Fig. 27 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0042] Fig.28This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0043] Fig.29 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0044] Fig.30 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment.

[0045] Fig.31 This is a diagram showing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

[0046] (TCI, spatial relationship, QCL)

[0047] In NR, research is being conducted on controlling 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 coding) of at least one of a signal and a channel (expressed as signal / channel) in the UE based on the transmission configuration indication state (Transmission Configuration Indication state (TCI state)).

[0048] The TCI state may also represent the TCI state applied to the downlink signal / channel. The TCI state equivalent to the TCI state applied to the uplink signal / channel may also be expressed as a spatial relation.

[0049] The so-called TCI state is information related to Quasi-Co-Location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relationship information, etc. The TCI state may also be set for each channel or each signal to the UE.

[0050] QCL is an indicator that indicates the statistical properties of a signal / channel. For example, it can also mean that when a certain signal / channel is in a QCL relationship with other signals / channels, it can be assumed that at least one of Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same among these different signals / channels (at least one of them is QCL).

[0051] In addition, the spatial reception parameter may also correspond to the reception beam of the UE (eg, reception simulation beam), and the beam may also be determined based on the spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may also be rewritten as sQCL (spatial QCL).

[0052] Regarding QCL, multiple types (QCL types) may also be specified. For example, four QCL types, namely types AD, may be set, and the parameters (or parameter sets) that can be assumed to be the same in the four QCL types AD are different, and the parameters (also referred to as QCL parameters) are expressed as follows:

[0053] QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0054] QCL type B (QCL-B): Doppler shift and Doppler spread,

[0055] QCL Type C (QCL-C): Doppler shift and average delay,

[0056] QCL type D (QCL-D): spatial reception parameters.

[0057] The UE assumes that a certain control resource set (CORESET), channel or reference signal is in a specific QCL (e.g., QCL type D) relationship with other CORESETs, channels or reference signals. This situation can also be called QCL assumption.

[0058] The UE may also determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI status or QCL assumption of the signal / channel.

[0059] The TCI state may be, for example, information related to the QCL between the channel being the object (in other words, the reference signal (RS) used for the channel) and other signals (such as other RS). The TCI state may also be set (indicated) by high-layer signaling, physical layer signaling, or a combination thereof.

[0060] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)).

[0061] 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)).

[0062] In addition, the RS that forms a QCL relationship with the channel may be, for example, a synchronization signal block (SynchronizationSignal Block (SSB)), a channel state information reference signal (CSI-RS), a measurement reference signal (Sounding Reference Signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), or at least one of a QCL detection reference signal (also called QRS).

[0063] The SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a broadcast channel (Physical Broadcast Channel (PBCH)). The SSB may also be referred to as an SS / PBCH block.

[0064] The RS of QCL type X in the TCI state may also mean an RS that is in a QCL type X relationship with a certain channel / signal (DMRS), and the RS may also be referred to as a QCL source of QCL type X in the TCI state.

[0065] For PDCCH and PDSCH, QCL type A RS can be set, and QCL type D RS can be set additionally. Since it is difficult to estimate Doppler shift, delay, etc. based on the one-shot reception of DMRS, QCL type A RS is used to improve channel estimation accuracy. QCL type D RS is used for receiving beam determination when receiving DMRS.

[0066] For example, TRS1-1, 1-2, 1-3, and 1-4 are transmitted, and TRS1-1 is notified as QCL type C / D RS according to the TCI state of PDSCH. By being notified of the TCI state, the UE can use the information obtained from the results of the past periodic reception / measurement of TRS1-1 for reception / channel estimation of DMRS for PDSCH. In this case, the QCL source of PDSCH is TRS1-1, and the QCL target is DMRS for PDSCH.

[0067] (Default TCI status / Default spatial relationship / Default PL-RS)

[0068] In Rel.16, PDSCH can also be scheduled by DCI with TCI field. The TCI state for PDSCH is indicated by TCI field. The TCI field of DCI format 1-1 is 3 bits, and the TCI field of DCI format 1-2 is 3 bits at most.

[0069] In RRC connected mode, if the TCI information element in the first DCI (higher layer parameter tci-PresentInDCI) is set to "enabled" for the CORESET scheduling PDSCH, the UE assumes that there is a TCI field in the DCI format 1_1 of the PDCCH sent in the CORESET.

[0070] In addition, if the TCI information element in the second DCI corresponding to the CORESET that schedules the PDSCH (high-level parameter tci-PresentInDCI-1-2) is set to the UE, the UE assumes that, in the DCI format 1_2 of the PDSCH sent in the CORESET, there is a TCI field with a DCI field size indicated by the TCI information element in the second DCI.

[0071] In addition, in Rel.16, PDSCH can also be scheduled by DCI without TCI field. Regarding the DCI format of the DCI, it can also be DCI format 1_1 / 1_2 when DCI format 1_0 or TCI information element (high-level parameter tci-PresentInDCI or tci-PresentInDCI-1-2) in DCI is not set (enabled). When PDSCH is scheduled by DCI without TCI field, and if the time offset between the reception of DL DCI (DCI (scheduling DCI) that schedules PDSCH) and the corresponding PDSCH (PDSCH scheduled by the DCI) is greater than the threshold (timeDurationForQCL), the UE assumes that the TCI state or QCL assumption for PDSCH is the same as the TCI state or QCL assumption (default TCI state) of CORESET (e.g., scheduling DCI).

[0072] In RRC connection mode, in both the case where the TCI information element in DCI (high-level parameters tci-PresentInDCI and tci-PresentInDCI-1-2) is set to "enabled" and the case where the TCI information element in DCI is not set, when the time offset between the reception of DL DCI (DCI that schedules PDSCH) and the corresponding PDSCH (PDSCH scheduled by the DCI) is less than a threshold (timeDurationForQCL) (application condition, first condition), if it is in the case of non-cross-carrier scheduling, the TCI state of PDSCH (default TCI state) may also be the TCI state of the lowest CORESET ID in the latest time slot in the activated DL BWP of the CC (specific UL signal). In other cases, the TCI state of PDSCH (default TCI state) may also be the TCI state of the lowest TCI state ID of PDSCH in the activated DL BWP of the scheduled CC.

[0073] In Rel. 15, separate MAC CEs such as MAC CE for activation / deactivation of PUCCH spatial relation and MAC CE for activation / deactivation of SRS spatial relation are required. PUSCH spatial relation follows SRS spatial relation.

[0074] In Rel. 16, at least one of the MAC CE for activation / deactivation of the PUCCH spatial relationship and the MAC CE for activation / deactivation of the SRS spatial relationship may not be used.

[0075] If both the spatial relationship and PL-RS for PUCCH are not set in FR2 (application condition, second condition), the default assumption of spatial relationship and PL-RS is applied to PUCCH (default spatial relationship and default PL-RS). If both the spatial relationship and PL-RS for SRS (SRS resources for SRS, or SRS resources corresponding to SRI in DCI format 0_1 ​​that schedules PUSCH) are not set in FR2 (application condition, second condition), the default assumption of spatial relationship and PL-RS is applied to PUSCH and SRS scheduled by DCI format 0_1 ​​(default spatial relationship and default PL-RS).

[0076] If CORESET is set in the activated DL BWP on the CC (applicable conditions), the default spatial relationship and default PL-RS may also be the TCI state or QCL assumption of the CORESET with the lowest CORESET ID in the activated DL BWP. If CORESET is not set in the activated DL BWP on the CC, the default spatial relationship and default PL-RS may also be the activated TCI state with the lowest ID of the PDSCH in the activated DL BWP.

[0077] In Rel.15, the spatial relationship of the PUSCH scheduled by DCI format 0_0 follows the spatial relationship of the PUCCH resource with the lowest PUCCH resource ID in the activated spatial relationship of the PUCCH on the same CC. Even if the PUCCH is not transmitted on the SCell, the network needs to update the PUCCH spatial relationship on all SCells.

[0078] In Rel.16, PUCCH configuration for PUSCH scheduled by DCI format 0_0 is not required. For PUSCH scheduled by DCI format 0_0, if there is no activated PUCCH spatial relationship or no PUCCH resources on the activated UL BWP in the CC (application condition, second condition), the default spatial relationship and default PL-RS are applied to the PUSCH.

[0079] The application conditions for the default spatial relationship / default PL-RS for SRS may also include the following situation: the default beam path loss activation information element for SRS (high-level parameter enableDefaultBeamPlForSRS) is set to valid. The application conditions for the default spatial relationship / default PL-RS for PUCCH may also include the following situation: the default beam path loss activation information element for PUCCH (high-level parameter enableDefaultBeamPlForPUCCH) is set to valid. The application conditions for the default spatial relationship / default PL-RS for PUSCH scheduled through DCI format 0_0 may also include the following situation: the default beam path loss activation information element for PUSCH scheduled through DCI format 0_0 (high-level parameter enableDefaultBeamPlForPUCCH0_0) is set to valid.

[0080] In Rel.16, when the RRC parameters (parameters for activating the default beam PL for PUCCH (enableDefaultBeamPL-ForPUCCH), parameters for activating the default beam PL for PUSCH (enableDefaultBeamPL-ForPUSCH0_0), or parameters for activating the default beam PL for SRS (enableDefaultBeamPL-ForSRS)) are set to the UE, but the spatial relationship or PL-RS is not set, the UE applies the default spatial relationship / PL-RS.

[0081] The above thresholds can also be referred to as: QCL time duration,

[0082] "timeDurationForQCL", "Threshold", "Threshold for offset between a DCI indicating aTCI state and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset", "beamSwitchTiming", scheduling offset threshold, scheduling offset threshold, etc. The above thresholds can also be reported by the UE as UE capabilities (per subcarrier interval).

[0083] When the offset (scheduling offset) between the reception of DL DCI and the corresponding PDSCH is less than the threshold timeDurationForQCL, and at least one TCI state set for the serving cell of the scheduled PDSCH includes "QCL type D", and the UE is set with 2 default TCI (two-default TCI) activation information element (enableTwoDefaultTCIStates-r16), and at least one TCI code point (code point of the TCI field in the DL DCI) represents two TCI states, the UE assumes that: the DMRS port of the PDSCH of the serving cell or the PDSCH transmission opportunity and the RS are set to QCL (quasi co-located), where the RS is related to the QCL parameters associated with the two TCI states corresponding to the lowest code point of the TCI code points including two different TCI states (2 default QCL assumption decision rule). The 2 default TCI activation information element indicates that the Rel.16 operation of the two default TCI states for PDSCH when at least one TCI code point is mapped to two TCI states is activated.

[0084] As the default TCI state of PDSCH in Rel.15 / 16, the default TCI state for single TRP, the default TCI state for multiple TRPs based on multiple DCIs, and the default TCI state for multiple TRPs based on single DCI are standardized.

[0085] As the default TCI state of aperiodic CSI-RS (A(aperiodic)-CSI-RS) in Rel.15 / 16, the default TCI state for a single TRP, the default TCI state for multiple TRPs based on multiple DCIs, and the default TCI state for multiple TRPs based on a single DCI are standardized.

[0086] In Rel. 15 / 16, a default spatial relationship regarding each of PUSCH / PUCCH / SRS and a default PL-RS are standardized.

[0087] (Multiple TRP)

[0088] In NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi TRP (MTRP)) are being studied using one or more panels (multi-panels) to perform DL transmission to the UE. In addition, the UE is studying the use of one or more panels to perform UL transmission to one or more TRPs.

[0089] In addition, multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0090] Multiple TRPs (for example, TRP#1, #2) can also be connected through an ideal / non-ideal backhaul to exchange information, data, etc. Different code words (CW) and different layers can also be sent from each TRP of the multiple TRPs. As a method of sending multiple TRPs, non-coherent joint transmission (NCJT) can also be used.

[0091] In NCJT, for example, TRP#1 performs modulation mapping on a first codeword and performs layer mapping, thereby transmitting a first PDSCH using a first precoding for a first number of layers (e.g., 2 layers). In addition, TRP#2 performs modulation mapping on a second codeword and performs layer mapping, thereby transmitting a second PDSCH using a second precoding for a second number of layers (e.g., 2 layers).

[0092] In addition, multiple PDSCHs (multi-PDSCHs) subjected to NCJT may also be defined to partially or completely overlap with respect to at least one of the time domain and the frequency domain. That is, at least one of the time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP may also overlap.

[0093] These first PDSCH and second PDSCH may also be considered not to be in a quasi-co-location (QCL) relationship (not quasi-co-located). Reception of multiple PDSCHs may also be rewritten as: not simultaneous reception of PDSCHs of a certain QCL type (eg, QCL type D).

[0094] Multiple PDSCHs from multiple TRPs (also referred to as multiple PDSCHs) can also be scheduled using one DCI (single DCI, single PDCCH) (single-primary mode, single-DCI based multi-TRP). Multiple PDSCHs from multiple TRPs can also be scheduled separately using multiple DCIs (multiple DCIs, multiple PDCCHs) (multiple-primary mode, multi-TRPs based on multiple DCIs (multiple-DCI based multi-TRP).

[0095] Research is underway to support repetition of PDSCH (transport block (TB) or codeword (CW)) across multiple TRPs in URLLC for multiple TRPs. Research is underway to support repetition across multiple TRPs in the frequency domain or layer (space) domain or time domain (URLLC schemes, such as schemes 1, 2a, 2b, 3, and 4). In scheme 1, multiple PDSCHs from multiple TRPs are space division multiplexing (SDM). In schemes 2a and 2b, PDSCHs from multiple TRPs are frequency division multiplexing (FDM). In scheme 2a, the redundancy version (RV) is the same for multiple TRPs. In scheme 2b, the RVs can be the same or different for multiple TRPs. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexing (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are sent in one time slot. In Scheme 4, multiple PDSCHs from multiple TRPs are sent in different time slots.

[0096] Based on such a multi-TRP scenario, more flexible transmission control using channels of good quality can be performed.

[0097] In order to support multiple TRP transmission within a cell (intra-cell, with the same cell ID) and between cells (inter-cell, with different cell IDs) based on multiple PDCCHs, in the RRC setting information for linking multiple pairs of PDCCH and PDSCH with multiple TRPs, a control resource set (CORESET) in the PDCCH setting information (PDCCH-Config) can also correspond to one TRP.

[0098] The UE may also determine that it is a multi-TRP based on multiple DCIs when at least one of the following conditions 1 and 2 is met. In this case, the TRP may also be rewritten as a CORESET pool index.

[0099] [Condition 1]

[0100] Sets a CORESET pool index.

[0101] [Condition 2]

[0102] Set the CORESET pool index to 2 different values ​​(e.g., 0 and 1).

[0103] If the following conditions are met, the UE can also be determined as multiple TRPs based on a single DCI. In this case, the two TRPs can also be rewritten as 2 TCI states indicated by MAC CE / DCI.

[0104] [condition]

[0105] In order to indicate one or two TCI states corresponding to one code point of the TCI field within the DCI, "Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE" is used.

[0106] The DCI used for common beam indication can be either a UE-specific DCI format (e.g., DL DCI format (e.g., 1_1, 1_2), UL DCI format (e.g., 0_1, 0_2), or a UE-group common DCI format.

[0107] (Multi-TRP PDCCH)

[0108] In order to improve the reliability of multi-TRP PDCCH based on non-single frequency network (SFN), the following studies 1 to 3 are being studied.

[0109] [Study 1] Coding / rate matching is based on a repetition, in which the same coded bits are repeated in other repetitions.

[0110] [Study 2] Each repetition has the same number of control channel elements (CCEs) and the same coded bits, and corresponds to the same DCI payload.

[0111] [Study 3] Two or more PDCCH candidates are linked to each other in an explicit manner. The UE is aware of the link before decoding.

[0112] The following options 1-2, 1-3, 2, 3 are being studied for PDCCH repetition.

[0113] [Option 1-2]

[0114] Two sets of PDCCH candidates (within a given search space (SS) set) are associated with two TCI states of the CORESET, respectively. Here, the same CORESET, the same SS set, and PDCCH repetitions at different monitoring times are used.

[0115] [Option 1-3]

[0116] The two sets of PDCCH candidates are associated with two SS sets respectively. The two SS sets are associated with a CORESET, and each SS set is associated with only one TCI state of the CORESET. Here, the same CORESET and two SS sets are used.

[0117] [Option 2]

[0118] One SS set is associated with two different CORESETs.

[0119] [Option 3]

[0120] The two SS sets are associated with the two CORESETs respectively.

[0121] In this way, support for two PDCCH candidates in two SS sets for PDCCH repetition is under study, and the two SS sets are explicitly linked.

[0122] (SFN PDCCH)

[0123] Regarding PDCCH / CORESET specified in Rel.15, one TCI state without a CORESET pool index (CORESETPoolIndex) (also referred to as TRP information (TRP Info)) is set for one CORESET.

[0124] Regarding the enhancement of PDCCH / CORESET specified in Rel.16, in multi-TRP based on multi-DCI, a CORESET pool index is set for each CORESET.

[0125] After Rel.17, the following enhancements 1 and 2 related to PDCCH / CORESET are being studied.

[0126] In the case of a single frequency network (SFN) formed by multiple antennas (small antennas, transmission and reception points) with the same cell ID, a maximum of two TCI states (enhancement 1) can be set / activated for one CORESET through high-layer signaling (RRC signaling / MACCE). SFN contributes to at least one of the operation and reliability improvement of HST (high speed train).

[0127] In addition, in the repeated transmission of PDCCH (also referred to as "repetition"), two PDCCH candidates in two search space sets are linked, and each search space set is associated with the corresponding CORESET (enhancement 2). Alternatively, the two search space sets are associated with the same or different CORESETs. For one CORESET, one (maximum one) TCI state can be set / activated through high-level signaling (RRC signaling / MAC CE).

[0128] If two search space sets are associated with different CORESETs with different TCI states, it can also mean repeated transmission of multiple TRPs. If two search space sets are associated with the same CORESET (CORESET with the same TCI state), it can also mean repeated transmission of a single TRP.

[0129] (HST)

[0130] In LTE, the configuration inside the tunnel of HST (high speed train) is difficult. Large antennas transmit to the outside / inside of the tunnel. For example, the transmission power of a large antenna is about 1 to 5W. For switching, it is important for the UE to transmit outside the tunnel before entering the tunnel. For example, the transmission power of a small antenna is about 250mW. Multiple small antennas (transmitting and receiving points) with the same cell ID and a distance of 300m form a single frequency network (SFN). All small antennas within the SFN send the same signal at the same time on the same PRB. It is assumed that the terminal transmits and receives to one base station. In fact, multiple transmitting and receiving points send the same DL signal. When moving at high speed, transmitting and receiving points in units of several kilometers form a cell. Switching is performed in the case of crossing cells. As a result, the switching frequency can be reduced.

[0131] In NR, in order to communicate with a terminal (hereinafter also referred to as UE) included in a high-speed moving train or other moving object (HST (high speed train)), it is assumed that a beam transmitted from a transmission point (for example, RRH) is used. In the existing system (for example, Rel.15), a beam is transmitted from the RRH in one direction to communicate with the moving object (see Figure 1A ).

[0132] exist Figure 1A In FIG. 1 , it is shown that RRHs are arranged along the moving path (or moving direction, traveling direction, driving path) of a moving body, and beams are formed from each RRH on the moving direction side of the moving body. An RRH that forms a beam in one direction may also be called a uni-directional RRH. Figure 1A In the example shown, the mobile object receives a negative Doppler shift (-fD) from each RRH.

[0133] In addition, although the case where the beam is formed on the moving direction side of the moving body is shown here, the present invention is not limited to this, and the beam may be formed on the opposite direction to the moving direction, or may be formed in any direction irrelevant to the moving direction of the moving body.

[0134] In Rel. 16 and later, it is also assumed that multiple (for example, two or more) beams are transmitted from the RRH. For example, it is assumed that beams are formed in two directions, the moving direction of the moving object and the opposite direction (see Figure 1B ).

[0135] exist Figure 1B , it is shown that RRHs are arranged along the moving path of the moving body, and beams are formed from each RRH both in the moving direction side and in the opposite direction side of the moving direction. RRHs that form beams in multiple directions (for example, 2 directions) may also be called bidirectional RRHs.

[0136] In this HST, the UE communicates in the same manner as in the single TRP method. In the implementation of the base station, it is possible to send from multiple TRPs (same cell ID).

[0137] exist Figure 1B In the example, when two RRHs (here, RRH#1 and RRH#2) use SFN, the mobile object switches from receiving a signal with a negative Doppler shift to receiving a signal with a higher power with a positive Doppler shift between the two RRHs. In this case, the maximum Doppler shift change range that needs to be corrected is the change from -fD to +fD, which is twice that of the case of a unidirectional RRH.

[0138] In addition, in the present disclosure, a positive (plus) Doppler shift may also be rewritten as information related to a positive Doppler shift, a Doppler shift in a positive (positive) direction (positive direction), and Doppler information in a positive (positive) direction (positive direction). In addition, a negative Doppler shift may also be rewritten as information related to a negative Doppler shift, a Doppler shift in a negative (minus) (negative) direction (negative direction), and Doppler information in a negative (negative) direction (negative direction).

[0139] Here, as the schemes for HST, the following schemes 0 to 2 (HST scheme 0 to HST scheme 2) are compared.

[0140] exist Figure 2A In scheme 0, the tracking reference signal (TRS), DMRS and PDSCH are sent publicly (using the same time resources and the same frequency resources) to two TRPs (RRHs) (normal SFN, transparent SFN, HST-SFN).

[0141] In Scheme 0, the UE receives the DL channel / signal in a manner equivalent to a single TRP, and therefore, the TCI state of the PDSCH is one.

[0142] In addition, Rel.16 specifies RRC parameters for distinguishing between transmission using a single TRP and transmission using SFN. When the UE reports the corresponding UE capability information, it can also distinguish between reception of DL channels / signals of a single TRP and reception of PDSCH assuming SFN based on the RRC parameters. On the other hand, the UE can also assume a single TRP for transmission and reception using SFN.

[0143] exist Figure 2B In scheme 1, TRS is sent in a TRP-specific manner (using different time / frequency resources depending on the TRP). In this example, TRS1 is sent from TRP#1 and TRS2 is sent from TRP#2.

[0144] In Scheme 1, the UE uses TRS from each TRP and receives DL channels / signals from each TRP, so the TCI state of PDSCH is 2.

[0145] exist Figure 2CIn Scheme 2, TRS and DMRS are sent in a TRP-specific manner. In this example, TRS1 and DMRS1 are sent from TRP#1, and TRS2 and DMRS2 are sent from TRP#2. Compared with Scheme 0, Schemes 1 and 2 can suppress the sudden change of Doppler shift and properly estimate / compensate for Doppler shift. Since Scheme 2 has more DMRS than Scheme 1, the maximum throughput of Scheme 2 is lower than that of Scheme 1.

[0146] In scheme 0, the UE switches between single TRP and SFN based on higher layer signaling (RRC information element / MAC CE).

[0147] The UE may also switch between Scheme 1 / Scheme 2 / NW pre-compensation scheme based on higher layer signaling (RRC information element / MAC CE).

[0148] In scheme 1, two TRS resources are set for the HST's traveling direction and its reverse direction respectively.

[0149] exist Figure 3A In the example, the TRPs (TRP#0, #2, ...) that send DL signals in the opposite direction of the HST send the first TRS (TRS coming from the front of the HST) in the same time and frequency resource (SFN). The TRPs (TRP#1, #3, ...) that send DL signals in the direction of travel of the HST send the second TRS (TRS coming from the rear of the HST) in the same time and frequency resource (SFN). The first TRS and the second TRS can also be sent / received using different frequency resources.

[0150] exist Figure 3B In the example of , TRS1-1 to 1-4 are transmitted as the first TRS, and TRS2-1 to 2-4 are transmitted as the second TRS.

[0151] If beam operation is considered, 64 beams and 64 time resources are used to send the first TRS, and 64 beams and 64 time resources are used to send the second TRS. The beam of the first TRS is considered to be equal to the beam of the second TRS (QCL type D RS is equal). By multiplexing the first TRS and the second TRS on the same time resources and different frequency resources, resource utilization efficiency can be improved.

[0152] exist Figure 4AIn the example of , RRH#0-#7 are configured along the moving path of the HST. RRH#0-#3 and RRH#4-#7 are connected to baseband units (BBU) #0 and #1, respectively. Each RRH is a bidirectional RRH, and a beam is formed using each transmission / reception point (TRP) in both the moving direction and the reverse direction of the moving path.

[0153] exist Figure 4B In the received signal of the example (single TRP (SFN) / scheme 1), when the UE receives a signal / channel (a beam in the direction of travel of the HST, a beam from behind the UE) transmitted from TRP#2n-1 (n is an integer greater than 0), a negative Doppler shift (-fD in this example) occurs. In addition, when the UE receives a signal / channel (a beam in the opposite direction of the direction of travel of the HST, a beam from in front of the UE) transmitted from TRP#2n (n is an integer greater than 0), a positive Doppler shift (+fD in this example) occurs.

[0154] After Rel.17, research is underway to conduct Doppler pre-compensation (correction) schemes (Pre-Doppler Compensation scheme, Doppler pre-compensation scheme, network (NW) pre-compensation scheme, HST NW pre-compensation scheme, TRP pre-compensation scheme, TRP-based pre-compensation scheme) when the base station transmits the downlink (DL) signal / channel from TRP to the UE in HST. TRP performs pre-Doppler compensation when transmitting the DL signal / channel to the UE, thereby reducing the impact of the Doppler shift when receiving the DL signal / channel in the UE. In the present disclosure, the Doppler pre-compensation scheme may also be a combination of Scheme 1 and pre-compensation based on the Doppler shift of the base station.

[0155] In the Doppler pre-compensation scheme, a study is being conducted to transmit the TRS from each TRP without Doppler pre-compensation and to transmit the PDSCH from each TRP with Doppler pre-compensation.

[0156] In the Doppler pre-compensation scheme, the TRP that forms a beam on the moving direction side of the moving path and the TRP that forms a beam on the opposite direction side of the moving path perform Doppler correction before transmitting DL signals / channels to the UEs in the HST. In this example, TRP#2n-1 performs positive Doppler correction and TRP#2n performs negative Doppler correction, thereby reducing the influence of Doppler shift on the UE when receiving the signal / channel ( Figure 4C ).

[0157] In addition, Figure 4C In this situation, the UE uses the TRS from each TRP and receives the DL channel / signal from each TRP. Therefore, the TCI state of PDSCH can also be 2.

[0158] Furthermore, after Rel.17, the use of the TCI field (TCI state field) is being studied to dynamically switch between a single TRP and SFN. For example, using RRC information elements / MAC CE (for example, Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE) / DCI (TCI field), one or two TCI states are set / indicated through each TCI code point (TCI field code point, DCI code point). The UE may also determine that it is receiving a PDSCH of a single TRP when one TCI state is set / indicated. In addition, the UE may also determine that it is receiving a PDSCH of a SFN using multiple TRPs when two TCI states are set / indicated.

[0159] (Simultaneous beam update of multiple CCs)

[0160] In Rel.16, one MAC CE can update the beam indexes (TCI states) of multiple CCs.

[0161] A maximum of two applicable CC lists (eg, applicable-CC-list) can be configured for the UE through RRC. When two applicable CC lists are configured, the two applicable CC lists may correspond to intra-band CA in FR1 and intra-band CA in FR2, respectively.

[0162] Activation of TCI state of PDCCH MAC CE activation: TCI state associated with the same CORESET ID on all BWP / CCs in the applicable CC list.

[0163] Activation of TCI status of PDSCH MAC CE activation: TCI status on all BWP / CCs in the applicable CC list.

[0164] Activation of the spatial relationship of A-SRS / SP-SRS MAC CE activation: The spatial relationship associated with the same SRS resource ID on all BWPs / CCs in the applicable CC list.

[0165] exist Figure 5 In the example, the UE is configured with a list of applicable CCs representing CC#0, #1, #2, and #3, and a list of 64 TCI states for the CORESET or PDSCH of each CC. When one TCI state of CC#0 is activated by MAC CE, the corresponding TCI state is activated in CC#1, #2, and #3.

[0166] Regarding such simultaneous beam updating, research is underway to see whether it can be applied only in a single TRP scenario.

[0167] For PDSCH, the UE may also be based on the following process A.

[0168] [Process A]

[0169] The UE receives an activation command for mapping up to 8 TCI states to code points of the DCI field (TCI field) within one CC / DL BWP or within one set of CC / BWPs. In the case where one set of TCI state IDs is activated for one set of CC / DL BWPs, the applicable list of CCs is determined by the CC indicated in the activation command, and the same set of TCI states is applied to all DL BWPs within the indicated CC. One set of TCI state IDs can be activated for one set of CC / DL BWPs only if the UE is not provided with multiple different values ​​of the CORESET pool index (CORESETPoolIndex) in the CORESET information element (ControlResourceSet) and is not provided with at least one TCI code point mapped to two TCI states.

[0170] For PDCCH, the UE may also be based on the following process B.

[0171] [Process B]

[0172] If the UE is provided with a list of up to 2 cells for simultaneous TCI state activation based on a simultaneous TCI update list (at least one of simultaneousTCI-UpdateList-r16 and simultaneousTCI-UpdateListSecond-r16) through a simultaneous TCI cell list (simultaneousTCI-CellList), the UE applies antenna port quasi co-location (QCL) provided by the same TCI state with activated TCI state ID value for CORESETs with index p within all configured DL BWPs of all configured cells in one list determined according to the serving cell index provided by the MAC CE command. The simultaneous TCI cell list can be provided for simultaneous TCI state activation only if the UE is not provided with different multiple values ​​of the CORESET pool index (CORESETPoolIndex) in the CORESET information element (ControlResourceSet) and is not provided with at least one TCI code point mapped to 2 TCI states.

[0173] For semi-persistent (SP) / aperiodic (AP)-SRS, the UE may also be based on the following process C.

[0174] [Process C]

[0175] When the spatial relationship information (spatialRelationInfo) for the SP or AP-SRS resource set by the SRS resource information element (high-level parameter SRS-Resource) is activated / updated through MAC CE for one set of CC / BWP, the applicable list of the CC is indicated through the simultaneous spatial update list (high-level parameter simultaneousSpatial-UpdateList-r16 or simultaneousSpatial-UpdateListSecond-r16), and the spatial relationship information is applied to the SP or AP-SRS resources with the same SRS resource ID in all BWPs within the indicated CC. If only the UE is not provided with different multiple values ​​of the CORESET pool index (CORESETPoolIndex) within the CORESET information element (ControlResourceSet) and is not provided with at least one TCI code point mapped to 2 TCI states, the spatial relationship information (spatialRelationInfo) for the SP or AP-SRS resources set by the SRS resource information element (high-layer parameter SRS-Resource) is activated / updated through MAC CE for one set of CC / BWP.

[0176] The simultaneous TCI cell list (simultaneousTCI-CellList) and the simultaneous TCI update list (at least one of simultaneousTCI-UpdateList1-r16 and simultaneousTCI-UpdateList2-r16) are lists of serving cells whose TCI relations can be updated simultaneously using MAC CE. simultaneousTCI-UpdateList1-r16 and simultaneousTCI-UpdateList2-r16 do not contain the same serving cell.

[0177] The simultaneous spatial update list (at least one of the higher layer parameters simultaneousSpatial-UpdatedList1-r16 and simultaneousSpatial-UpdatedList2-r16) is a list of serving cells whose spatial relationships can be updated simultaneously using MAC CE. simultaneousSpatial-UpdatedList1-r16 and simultaneousSpatial-UpdatedList2-r16 do not contain the same serving cells.

[0178] Here, the simultaneous TCI update list and the simultaneous spatial update list are set through RRC, the CORESET pool index of CORESET is set through RRC, and the TCI code point mapped to the TCI state is indicated through MAC CE.

[0179] (unified / common TCI framework)

[0180] According to the unified TCI framework, UL and DL channels can be controlled through a common framework. The unified TCI framework does not specify the TCI state or spatial relationship for each channel as in Rel.15, but can indicate a common beam (common TCI state) and apply it to all UL and DL channels, or apply the common beam for UL to all UL channels and the common beam for DL ​​to all DL channels.

[0181] One common beam for both DL and UL, or a common beam for DL ​​and a common beam for UL (two common beams in total) is under study.

[0182] The UE may also 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 also assume different TCI states for each of 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).

[0183] The default beams of UL and DL can also be aligned through MAC CE-based beam management (MAC CE-level beam indication). The default TCI state of PDSCH can also be updated to match the default UL beam (spatial relationship).

[0184] A common beam / unified TCI state may also be indicated from the same TCI pool (joint common TCI pool, joint TCI pool, set) for both UL and DL through DCI-based beam management (DCI level beam indication). X (>1) TCI states may also be activated through MAC CE. UL / DL DCI may also select one of the X activated TCI states. The selected TCI state may also be applied to channels / RS for both UL and DL.

[0185] The TCI pool (set) can be a plurality of TCI states set by RRC parameters, or a plurality of TCI states (activated TCI state, activated TCI pool, set) activated by MAC CE among the plurality of TCI states set by RRC parameters. Each TCI state can also be a QCL type A / D RS. As a QCL type A / D RS, SSB, CSI-RS or SRS can also be set.

[0186] The number of TCI states corresponding to each of more than one TRP may also be specified. For example, the number N (≥1) of TCI states (UL TCI states) applied to UL channels / RSs and the number M (≥1) of TCI states (DL TCI states) applied to DL channels / RSs may also be specified. At least one of N and M may also be notified / set / indicated to the UE via high-layer signaling / physical layer signaling.

[0187] In the present disclosure, the case described as N=M=X (X is an arbitrary integer) may also mean that X (corresponding to X TRPs) TCI states (joint TCI states) common to UL and DL are notified / set / indicated to the UE.

[0188] In addition, the case described as N=X (X is an arbitrary integer) and M=Y (Y is an arbitrary integer, and may also be Y=X) may also mean that X UL TCI states (corresponding to X TRPs) and Y DL TCI states (corresponding to Y TRPs) are notified / set / indicated to the UE. The UL TCI state and the DL TCI state may mean a TCI state common to the UL and DL (i.e., a joint TCI state), or may mean a TCI state for each of the UL and DL (i.e., a separate TCI state).

[0189] For example, the case where N=M=1 is recorded may also mean that a TCI state common to UL and DL for a single TRP (joint TCI state for a single TRP) is notified / set / indicated to the UE.

[0190] In addition, for example, the case where N=1, M=1 is recorded may also mean that one UL TCI state and one DL TCI state for a single TRP are separately notified / set / indicated to the UE (separate TCI state for a single TRP).

[0191] In addition, for example, the case recorded as N=M=2 may also mean that the UE is notified / set / indicated of multiple (2) TCI states common to UL and DL (joint TCI state for multiple TRPs) for multiple (2) TRPs.

[0192] In addition, for example, the case recorded as N=2, M=2 may also mean that the UE is notified / set / indicated of multiple (2) UL TCI states and multiple (2) DL TCI states (separate TCI states for multiple TRPs) for multiple (2) TRPs.

[0193] In addition, for example, the case where N=2 and M=1 is recorded may also mean that two TCI states common to UL and DL are notified / set / indicated to the UE. In this case, the UE may use the two TCI states set / indicated as the UL TCI state and one of the two TCI states set / indicated as the DL TCI state.

[0194] In addition, for example, the case where N=2 and M=1 is described may also mean that two UL TCI states and one DL TCI state are notified / configured / instructed to the UE as a separate TCI state.

[0195] In the above example, the case where the values ​​of N and M are 1 or 2 is described, but the values ​​of N and M may be 3 or more, and N and M may be different.

[0196] The case of M>1 / N>1 may also represent at least one of TCI status indications for multiple TRPs and multiple TCI status indications for inter-band CA.

[0197] exist Fig. 6A In the example, the RRC parameter (information element) sets multiple TCI states for both DL and UL. The MACCE may also activate multiple TCI states among the set multiple TCI states. The DCI may also indicate one of the activated multiple TCI states. The DCI may also be a UL / DL DCI. The indicated TCI state may also be applied to at least one (or all) of the channels / RSs of the UL / DL. One DCI may also indicate both UL TCI and DL TCI.

[0198] exist Fig. 6A In the example of FIG. 1 , a point may be one TCI state applied to both UL and DL, or two TCI states applied to UL and DL respectively.

[0199] At least one of the multiple TCI states set by RRC parameters and the multiple TCI states activated by MAC CE may also be referred to as a TCI pool (common TCI pool, joint TCI pool, TCI state pool). The multiple TCI states activated by MAC CE may also be referred to as an activated TCI pool (activated common TCI pool).

[0200] In addition, in the present disclosure, a high-level parameter (RRC parameter) for setting multiple TCI states may also be referred to as setting information for setting multiple TCI states, or simply referred to as "setting information". In addition, in the present disclosure, using DCI to indicate one of multiple TCI states may also be receiving indication information for indicating one of multiple TCI states included in DCI, or simply referred to as receiving "indication information".

[0201] exist Figure 6B In the example, the RRC parameters set multiple TCI states for both DL and UL (joint common TCI pool). The MAC CE may also activate multiple TCI states among the set multiple TCI states (activate TCI pool). Alternatively, separate activation TCI pools may be set / activated for UL and DL.

[0202] DL DCI or a new DCI format may also select (indicate) more than one (for example, one) TCI state. The selected TCI state may also be applied to more than one (or all) DL channels / RS. The DL channel may also be PDCCH / PDSCH / CSI-RS. The UE may also use the TCI state operation (TCI framework) of Rel.16 to determine the TCI state of each DL channel / RS. UL DCI or a new DCI format may also select (indicate) more than one (for example, one) TCI state. The selected TCI state may also be applied to more than one (or all) UL channels / RS. The UL channel may also be PUSCH / SRS / PUCCH. In this way, different DCIs may also indicate UL TCI and DL DCI separately.

[0203] The existing DCI format 1_1 / 1_2 can also be used to indicate the common TCI status.

[0204] The DCI format indicating the TCI state may also be a specific DCI format. For example, the specific DCI format may also be DCI format 1_1 / 1_2 (specified in Rel.15 / 16 / 17).

[0205] The DCI format indicating the TCI state (DCI format 1_1 / 1_2) may also be a DCI format without DL allocation. In the present disclosure, a DCI format without DL allocation, a DCI format without scheduling PDSCH (DCI format 1_1 / 1_2), a DCI format not including one or more specific fields (DCI format 1_1 / 1_2), a DCI format in which one or more specific fields are set to fixed values ​​(DCI format 1_1 / 1_2), etc. may also be rewritten to each other.

[0206] Regarding a DCI format without DL allocation (a DCI format that does not include one or more specific fields), the specific field may be a field other than the TCI field, the DCI format identifier field, the carrier indicator field, the bandwidth part (BWP) indicator field, the time domain resource allocation (TDRA) field, the downlink assignment index (DAI) field (if set), the transmission power control (TPC) command field (for scheduled PUCCH), the PUCCH resource indicator field, and the PDSCH-to-HARQ feedback timing indicator field (if present). The specific field may be set as a reserved field or may be ignored.

[0207] Regarding the DCI format without DL allocation (DCI format in which one or more specific fields are set to fixed values), the specific fields may also be a Redundancy Version (RV) field, a Modulation and Coding Scheme (MCS) field, a New Data Indicator field, and a Frequency Domain Resource Assignment (FDRA) field.

[0208] The RV field may also be set to all 1s. The MCS field may also be set to all 1s. The NDI field may also be set to 0. The FDRA field of type 0 may also be set to all 0s. The FDRA field of type 1 may also be set to all 1s. The FDRA field used for dynamic switching (high-level parameter dynamicSwitch) may also be set to all 0s.

[0209] The common TCI framework may also have separate TCI states for DL ​​and UL.

[0210] (beam application time (BAT))

[0211] In the unified TCI state in Rel.17, the introduction of time related to beam application (beam application time (BAT)) is being studied.

[0212] In the unified TCI state in Rel. 17, the DCI that schedules the PDSCH (scheduling DCI) does not indicate the TCI state of the PDSCH.

[0213] The scheduling DCI indicates the "indicated TCI state" of the DL / UL channel / RS which is later in time than the DCI.

[0214] In the present disclosure, "indicated TCI state", "Rel.17TCI state", "unified TCI state", "public TCI state", "joint (DL / UL) TCI state", "separate (DL / UL) TCI state", and "(abbreviated as) TCI state" can also be rewritten mutually.

[0215] In Rel.17, research is underway to apply (start applying) the indicated TCI state in the next time slot after a specific time (BAT) has passed since the transmission of the HARQ-ACK corresponding to (associated with) the beam indication DCI (the last codeword of the PUSCH / PUCCH that sends the HARQ-ACK).

[0216] Here, the beam indication DCI may also be a DCI indicating a TCI state. The beam indication DCI may also be a DCI format with DL assignment (DCI format with DL assignment) and a DCI format without DL assignment (DCI format without DL assignment).

[0217] In addition, the HARQ-ACK corresponding to the beam indication DCI may mean the HARQ-ACK corresponding to the PDSCH scheduled by the beam indication DCI, or may mean the HARQ-ACK for the beam indication DCI.

[0218] The specific time (BAT) may also be provided by a specific parameter (eg, BeamAppTime_r17). The specific parameter may be set to the UE via a higher layer signaling (RRC signaling), or may be determined based on reported UE capability information.

[0219] The length of BAT may be expressed in symbol units, for example, 1, 2, 4, 7, 14, 28, 42, 56, 70, 84, 98, 112, 224, and 336 (all in symbol units).

[0220] Figure 7 This is a diagram showing an example of BAT specified in Rel.17. Figure 7In the example shown, the UE receives the beam indication DCI and is scheduled with the PDSCH by the DCI. Then, the UE sends a positive acknowledgement (ACK, HARQ-ACK) for the PDSCH.

[0221] exist Figure 7 In the example shown, the UE starts applying the TCI state indicated by the DCI after the time provided by BeamAppTime_r17 has passed since the HARQ-ACK corresponding to the beam indication DCI was sent (the last codeword of the PUSCH / PUCCH that sends the HARQ-ACK) (the next time slot).

[0222] The UE can send HARQ-ACK associated with one or more PDSCHs in one transmission opportunity.

[0223] When the UE sends HARQ-ACK associated with multiple PDSCHs in one transmission opportunity, only the TCI field of one DCI among the DCIs used to schedule the multiple PDSCHs is valid (the TCI field used as beam indication), and the TCI fields of the other DCIs are invalid (the TCI field not used as beam indication).

[0224] The DCI whose TCI field is set to be valid may also be any DCI among multiple DCIs.

[0225] Figure 8 This is a diagram showing an example of the application of the TCI state when receiving multiple beam indication DCIs. Figure 8 In the example, the UE receives DCI#1 for scheduling PDSCH#1, DCI#2 for scheduling PDSCH#2, DCI#3 for scheduling PDSCH#3, and DCI#4 for scheduling PDSCH#4. HARQ-ACK for PDSCH#1-#4 is sent in the same transmission opportunity.

[0226] exist Figure 8 In the example shown, DCI#1-#3 indicate TCI state #1, and DCI#4 indicates TCI state #2.

[0227] After the BAT period has passed since the HARQ-ACK was sent (the last symbol of the PUSCH / PUCCH that sends the HARQ-ACK), the UE starts to apply TCI state #2 indicated by DCI #4. At this time, the UE ignores the TCI state indicated by DCI #1-#3 (TCI field is not used for beam indication).

[0228] in addition, Figure 8, an example of applying the TCI state of the DCI that is the latest in time among multiple DCIs is shown, but the DCI used to indicate the TCI state to be applied may also be any one of DCI#1-DCI#3.

[0229] (analyze)

[0230] The TCI state introduced in Rel. 17 (Rel. 17 TCI state, common TCI state) is under study to indicate 1 TCI state (M=1, N=1 or M=N=1). In other words, the Rel. 17 TCI state is under study to be applicable to a situation where a single TRP is used.

[0231] It is under study that the TCI state / spatial relationship specified up to Rel.15 / 16 (excluding the TCI state related to the reference signal for positioning) and the Rel.17 TCI state are not set in the same band.

[0232] In this case, in the same band as the band in which the Rel.17 TCI state is set, the function (feature, such as operation using multiple TRPs) using the TCI state / spatial relationship of Rel.15 / 16 specified in Rel.15 to 17 cannot be set.

[0233] Therefore, in order to support the functions of TCI state / spatial relationship using Rel.15 / 16 including multi-TRP scheme, the common TCI state (Rel.17TCI state) needs to be extended (enhanced) (for example, using MAC CE / DCI to indicate more than 2 TCI states).

[0234] For example, it is being studied that after Rel.18, the common TCI state can be applied to at least one multi-TRP scheme specified in Rel.16 / 17 as follows:

[0235] · NCJTed PDSCH based on single DCI (Rel. 16).

[0236] · NCJTed PDSCH based on multiple DCIs (Rel.16).

[0237] ·Repeated transmission of PDSCH using SDM / TDM / FDM based on a single DCI (Rel.16).

[0238] ·Repeated transmission of PDCCH / PUCCH / PUSCH using multiple TRPs (Rel.17).

[0239] ·Operations related to multiple TRPs between cells (Rel.17).

[0240] ·Beam management for multiple TRPs (Rel.17).

[0241] ·HST / SFN (Rel.17).

[0242] In addition, the extension of the common TCI state can also be used for beam indication in inter-band carrier aggregation. In beam indication in inter-band carrier aggregation, one MAC CE / DCI can also be used to indicate more than one TCI state of multiple different bands.

[0243] However, in the transmission and reception of signals / channels using multiple TRPs, there is insufficient research on the setting / indication / application of a common TCI state. More specifically, there is insufficient research on the application of a TCI state based on a beam indication DCI and the application of a TCI state based on a scheduling / triggering DCI when a common TCI state is used. In addition, there is insufficient research on operations associated with switching between transmission and reception using a single TRP and transmission and reception using multiple TRPs. If these studies are insufficient, there is a concern that this may lead to a reduction in communication quality, a reduction in throughput, etc.

[0244] Therefore, the inventors of the present invention have conceived a method of appropriately setting / indicating / applying the TCI state even when the TCI state is applied to multiple signals / channels in the transmission / reception of signals / channels using multiple TRPs.

[0245] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0246] In the present disclosure, "A / B / C", "at least one of A, B and C" may also be replaced by each other. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, activated DL BWP, activated UL BWP, and band may also be replaced by each other. In the present disclosure, index, ID, indicator, and resource ID may also be replaced by each other. In the present disclosure, sequence, list, set, group, group, cluster, subset, etc. may also be replaced by each other. In the present disclosure, support, control, controllable, operation, and operation may also be replaced by each other.

[0247] In the present disclosure, configure, activate, update, indicate, enable, specify, and select may be overwritten with each other.

[0248] In the present disclosure, high-layer signaling may be, for example, radio resource control (RRC) signaling, medium access control (MAC) signaling, broadcast information, or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, high layers, high-layer parameters, RRC information elements (IEs), RRC messages, and settings may also be mutually rewritten.

[0249] MAC signaling may also use, for example, MAC Control Element (MAC CE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. In the present disclosure, MAC CE, update command, and activation / deactivation command may also be mutually rewritten.

[0250] The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI, SIB1)), other system information (Other System Information (OSI)), etc.

[0251] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameter, spatial domain reception filter, UE spatial domain reception filter, UE reception beam, DL beam, DL reception beam, DL precoding, DL precoder, DL-RS, RS of QCL type D assumed by TCI state / QCL, RS of QCL type A assumed by TCI state / QCL, spatial relationship, spatial domain transmission filter, UE spatial domain transmission filter, UE transmission beam, UL beam, UL transmission beam, UL precoding, UL precoder, PL-RS, these can also be rewritten mutually. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS, SRS, these can also be rewritten mutually.

[0252] In the present disclosure, a panel, a UE panel, a panel group, an antenna group, a UE capability value, a UE capability value set, a specific (pool) index included in a PUSCH setting, a specific (pool) index included in a PUCCH setting, a specific (pool) index included in an SRS setting, a beam, a beam group, a precoder, an uplink (UL) transmitting entity, a transmission / reception point (TRP), a base station, spatial relationship information (Spatial Relation Information (SRI)), a spatial relationship, an SRS resource indicator (SRS Resource Indicator (SRI)), a control resource set (COntrol REsource SET (CORESET)), a physical downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a codeword (Codeword (CW)), a transport block (Transport Block (TB)), a reference signal (Reference Signal (RS)), an antenna port (e.g., a demodulation reference signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal (DeModulation Reference Signal ( The UE capability value set may also include, for example, the maximum number of SRS ports supported. The UE capability value set may also include, for example, the maximum number of SRS ports supported.

[0253] The panel may also be associated with at least one of a group index of an SSB / CSI-RS group, a group index of a group-based beam report, and a group index of an SSB / CSI-RS group for a group-based beam report.

[0254] Furthermore, the panel identifier (Identifier (ID)) can be rewritten with the panel, that is, the TRP ID can be rewritten with the TRP, the CORESET group ID can be rewritten with the CORESET group, etc.

[0255] In the present disclosure, TRP, transmission point, panel, DMRS port group, CORESET pool, one of two TCI states associated with a code point of the TCI field, these can also overwrite each other.

[0256] In the present disclosure, a single (single) TRP, a single TRP system, a single TRP transmission, and a single PDSCH may also be overwritten with each other. In the present disclosure, multiple (multiple) TRPs, multiple TRP systems, multiple TRP transmissions, and multiple PDSCHs may also be overwritten with each other. In the present disclosure, a single DCI, a single PDCCH, multiple TRPs based on a single DCI, and activation of two TCI states on at least one TCI code point may also be overwritten with each other.

[0257] In the present disclosure, a single TRP, a channel using a single TRP, a channel using one TCI state / spatial relationship, multiple TRPs are not activated through RRC / DCI, multiple TCI states / spatial relationships are not activated through RRC / DCI, a CORESET pool index (CORESETPoolIndex) value of 1 is not set for any CORESET, and any code point of the TCI field is not mapped to two TCI states, which can also overwrite each other.

[0258] In the present disclosure, multiple TRPs, channels using multiple TRPs, channels using multiple TCI states / spatial relationships, multiple TRPs activated through RRC / DCI, multiple TCI states / spatial relationships activated through RRC / DCI, multiple TRPs based on a single DCI, and at least one of multiple TRPs based on multiple DCIs may also overwrite each other. In the present disclosure, multiple TRPs based on multiple DCIs, and a CORESET pool index (CORESETPoolIndex) value set to 1 for CORESET may also overwrite each other. In the present disclosure, multiple TRPs based on a single DCI, and at least one code point of a TCI field mapped to two TCI states may also overwrite each other.

[0259] In the present disclosure, TRP#1 (first TRP) may correspond to either CORESET pool index = 0 or the first TCI state of two TCI states corresponding to a code point of the TCI field. TRP#2 (second TRP) TRP#1 (first TRP) may correspond to either CORESET pool index = 1 or the second TCI state of two TCI states corresponding to a code point of the TCI field.

[0260] In the present disclosure, single DCI (sDCI), single PDCCH, multi-TRP system based on single DCI, MTRP based on sDCI, activation of 2 TCI states on at least one TCI code point, these can also be rewritten with each other.

[0261] In the present disclosure, multiple DCI (mDCI), multiple PDCCH, multiple TRP system based on multiple DCI, MTRP based on mDCI, setting 2 CORESET pool indexes or CORESET pool index = 1 (or a value greater than 1), these can also be rewritten with each other.

[0262] The QCL of the present disclosure and the QCL type D can also be rewritten into each other.

[0263] In the present disclosure, “TCI state A is the same QCL type D as TCI state B”, “TCI state A is the same as TCI state B”, “TCI state A and TCI state B are QCL type D”, etc. can also be rewritten.

[0264] In the present disclosure, the code point of the DCI field 'Transmission Configuration Indication', the TCI code point, the DCI code point, and the code point of the TCI field may be overwritten.

[0265] In the present disclosure, single TRP and SFN can also be replaced with each other. In the present disclosure, HST, HST scheme, high-speed mobile scheme, scheme 1, scheme 2, NW pre-compensation scheme, HST scheme 1, HST scheme 2, HST NW pre-compensation scheme can also be replaced with each other.

[0266] In the present disclosure, PDSCH / PDCCH using a single TRP can also be mutually rewritten with PDSCH / PDCCH based on a single TRP and single TRPPDSCH / PDCCH. In addition, in the present disclosure, PDSCH / PDCCH using SFN can also be mutually rewritten with PDSCH / PDCCH using SFN, PDSCH / PDCCH based on SFN, and SFN PDSCH / PDCCH in multiple scenarios.

[0267] In the present disclosure, receiving a DL signal (PDSCH / PDCCH) using SFN may also mean using the same time / frequency resources and / or receiving the same data (PDSCH) / control information (PDCCH) from multiple transmission and reception points. In addition, receiving a DL signal using SFN may also mean using the same time / frequency resources and / or receiving the same data / control information using multiple TCI states / spatial domain filters / beams / QCLs.

[0268] In the present disclosure, the HST-SFN scheme, the SFN scheme after Rel.17, the new SFN scheme, the new HST-SFN scheme, the HST-SFN scenario after Rel.17, the HST-SFN scheme for the HST-SFN scenario, the SFN scheme for the HST-SFN scenario, Scheme 1, the HST-SFN scheme A / B, the HST-SFN type A / B, the Doppler pre-compensation scheme, Scheme 1 (HST Scheme 1) and at least one of the Doppler pre-compensation schemes may also be rewritten with each other.

[0269] In the present disclosure, Doppler pre-compensation scheme, base station pre-compensation scheme, TRP pre-compensation scheme, pre-Doppler compensation scheme, Doppler pre-compensation scheme, NW pre-compensation scheme, HST NW pre-compensation scheme, TRP pre-compensation scheme, TRP-based pre-compensation scheme, HST-SFN scheme A / B, HST-SFN type A / B, these can also be rewritten mutually. In the present disclosure, pre-compensation scheme, reduction scheme, improvement scheme, correction scheme can also be rewritten mutually.

[0270] In the present disclosure, there are linked PDCCH / search space (SS) / CORESET, linked PDCCH / SS / CORESET, and pairs of PDCCH / SS / CORESET, which can also be rewritten with each other. In the present disclosure, there are no linked PDCCH / SS / CORESET, unlinked PDCCH / SS / CORESET, and individual PDCCH / SS / CORESET can also be rewritten with each other.

[0271] In the present disclosure, two linked CORESETs used for PDCCH repetition and two CORESETs associated with two linked SS sets, respectively, may be rewritten mutually.

[0272] In the present disclosure, SFN-PDCCH repetition, PDCCH repetition, two linked PDCCHs, and reception of one DCI across the two linked search spaces (SS) / CORESETs may be overwritten.

[0273] In the present disclosure, PDCCH repetition, SFN-PDCCH repetition, PDCCH repetition for higher reliability, PDCCH for higher reliability, PDCCH for reliability, and two linked PDCCHs may be rewritten mutually.

[0274] In the present disclosure, the PDCCH reception method, PDCCH repetition, SFN-PDCCH repetition, HST-SFN, and HST-SFN scheme may also be rewritten mutually.

[0275] In the present disclosure, the PDSCH reception method, multi-TRP based on single DCI, and HST-SFN scheme can also be rewritten with each other.

[0276] In the present disclosure, multi-TRP repetition based on a single DCI can be NCJT of enhanced mobile broadband (eMBB) service (low priority, priority 0) or repetition of URLLC service (high priority, priority 1) of ultra-reliable and low latency communications service.

[0277] In each embodiment of the present disclosure, the PDSCH for multiple TRPs based on a single DCI and the PDSCH to which TDM / FDM / SDM for multiple TRPs (specified in Rel. 16) is applied may overwrite each other.

[0278] In each embodiment of the present disclosure, the PDSCH for multiple TRPs may be rewritten with the PDSCH for multiple TRPs using TDM / FDM / SDM based on a single DCI (specified in Rel. 16).

[0279] In each embodiment of the present disclosure, PUSCH / PUCCH / PDCCH for multiple TRPs based on a single DCI may also be rewritten with repeated transmission (repetition) of PUSCH / PUCCH / PDCCH for multiple TRPs (specified in Rel. 17 and later).

[0280] In each embodiment of the present disclosure, SFN PDSCH / PDCCH may be rewritten with SFNPDSCH / PDCCH specified in Rel.17 and later.

[0281] In each embodiment of the present disclosure, setting the use of multiple TRPs based on multiple DCIs may also mean setting the CORESET pool index = 1. In addition, setting the use of multiple TRPs based on multiple DCIs may also mean setting the CORESET pool index to 2 different values ​​(e.g., 0 and 1).

[0282] In various embodiments of the present disclosure, UL transmission using multiple panels may also mean a UL transmission scheme using multiple panels of a UE based on DCI enhancement.

[0283] The following embodiments of the present disclosure may also be applied to the sending and receiving of any channel / signal that is an application object of the unified TCI status framework specified in Rel. 17 and later.

[0284] In the present disclosure, applying the TCI state to each channel / signal / resource may also mean applying the TCI state to the transmission and reception of each channel / signal / resource.

[0285] In the present disclosure, small, few, short, and low can also be replaced by each other. In addition, in the present disclosure, ignore, discard, cancel, suspend, and postpone can also be replaced by each other.

[0286] In the present disclosure, repetition, repeated transmission, and repeated reception may be replaced with each other.

[0287] In the present disclosure, channels, signals, and channels / signals may also be replaced with each other. In the present disclosure, DL channels, DL signals, DL signals / channels, transmission / reception of DL signals / channels, DL reception, and DL transmission may also be replaced with each other. In the present disclosure, UL channels, UL signals, UL signals / channels, transmission / reception of UL signals / channels, UL reception, and UL transmission may also be replaced with each other.

[0288] In the present disclosure, the first TRP may correspond to the first TCI state. In the present disclosure, the second TRP may correspond to the second TCI state. In the present disclosure, the nth TRP may correspond to the nth TCI state.

[0289] In the present disclosure, the value of the first CORESET pool index (e.g., 0), the value of the first TRP index (e.g., 1), and the first TCI state (first DL / UL (joint / individual) TCI state) may also correspond to each other. In the present disclosure, the value of the second CORESET pool index (e.g., 1), the value of the second TRP index (e.g., 2), and the second TCI state (second DL / UL (joint / individual) TCI state) may also correspond to each other.

[0290] In addition, in the following embodiments of the present disclosure, regarding the application of multiple TCI states in the transmission and reception using multiple TRPs, the method with two TRPs as the object is mainly described (that is, the case where at least one of N and M is 2), however, the number of TRPs may be more than 3 (multiple), and each embodiment may be applied corresponding to the number of TRPs. In other words, at least one of N and M may be a number greater than 2.

[0291] (Wireless Communication Method)

[0292] <0th embodiment>

[0293] It is also conceivable that multiple TRPs based on a single DCI are supported when multiple TRPs utilize an ideal backhaul (see Fig. 9A ).

[0294] At this time, one beam indication DCI may also indicate multiple TCI states for each TRP. The multiple TCI states may be, for example, a maximum of 2 joint TCI states or a maximum of 4 separate DL / UL TCI states (2 DL TCI states and 2 UL TCI states).

[0295] In the present disclosure, 1 TCI state may mean 1 joint (DL / UL) TCI state, and may also mean at least one of 1 DL (single) TCI state and 1 UL (single) TCI state.

[0296] It is also conceivable that multiple PDCCH (DCI) is supported when using ideal backhaul / non-ideal backhaul between multiple TRPs (see Fig. 9B ).

[0297] At this time, one DCI associated with one TRP (CORESET pool index) can also indicate the TCI status corresponding to the TRP.

[0298] In addition, the ideal backhaul may also be referred to as DMRS port group type 1, reference signal association group type 1, antenna port group type 1, CORESET pool type 1, etc. The non-ideal backhaul may also be referred to as DMRS port group type 2, reference signal association group type 2, antenna port group type 2, CORESET pool type 2, etc. The names are not limited thereto.

[0299] The field (TCI field) included in the DCI for indicating the TCI status may also comply with at least one of the following options 0-1 and 0-2.

[0300] [Select 0-1]

[0301] The TCI field specified up to Rel.15 / 16 can also be reused (refer to Fig. 10A ).like Fig. 10A As shown, the DCI may also include one TCI field. The number of bits of the TCI field may also be a specific number (eg, 3).

[0302] [Option 0-2]

[0303] It is also possible to extend the TCI field specified up to Rel.15 / 16 (refer to Fig. 10B ). For example, DCI may also include multiple (for example, 2) TCI fields. The number of bits of each TCI field may also be a specific number (for example, 3).

[0304] In option 0-2, DCI overhead is not added to DCI without DL allocation. On the other hand, DCI overhead is added to DCI with DL allocation.

[0305] Regarding multiple TRPs based on a single DCI, in the case of a joint TCI state, a MAC CE may also be used to activate the DL / UL (joint) TCI state for the UE. Then, the UE may be indicated with a first DL / UL (joint) TCI state and a second DL / UL (joint) TCI state using DCI (beam indication) (see Fig.11A ).

[0306] The TCI code point indicated by the beam indication may also correspond to one or more (two) TCI states (first joint TCI state / second joint TCI state) (refer to Fig. 11B ).

[0307] exist Fig. 11BIn the example shown, all TCI code points corresponding to the activated TCI state correspond to two TCI states, but it is also possible to use an association in which at least one TCI code point corresponding to the activated TCI state corresponds to two TCI states. By using such an association, it is possible to dynamically switch between single TRP and multiple TRP.

[0308] Regarding multiple TRPs based on a single DCI, in the case of a single TCI state, the MAC CE can also be used to activate the DL (single) TCI state and the UL (single) TCI state for the UE. Then, the DCI (beam indication) can also be used to indicate the first DL (single) TCI state and the first UL (single) TCI state, and the second DL (single) TCI state and the second UL (single) TCI state (refer to Fig. 12A ).

[0309] The TCI code point indicated by the beam indication may also correspond to one or more (two) TCI states (first individual (DL / UL) TCI state / second individual (DL / UL) TCI state) (refer to Fig. 12B ).

[0310] exist Fig. 12B In the example shown, an example is shown in which all TCI code points corresponding to the activated TCI state correspond to two TCI states (first single (DL / UL) TCI state / second single (DL / UL) TCI state), but it is also possible to use an association in which at least one TCI code point corresponding to the activated TCI state corresponds to two TCI states. By using such an association, single TRP and multiple TRPs can be switched dynamically.

[0311] In addition, Fig. 12A FIG. 4 shows an example of activating a separate TCI state in the form of a DL TCI state and a UL TCI state regarding the TCI state activated by the MAC CE, however, even in the case of a separate TCI state, the activated DL TCI state and UL TCI state may include a common TCI state.

[0312] Regarding multi-TRP based on multi-DCI, at least one of TCI state, RRC-based setting, MAC CE-based activation, and DCI-based indication can also be performed according to each CORESET pool index.

[0313] Regarding multi-TRP based on multi-DCI, in the case of joint TCI state, for the CORESET pool index of the first value (e.g., 0), the UE may also be configured based on TCI state, based on RRC, based on MAC CE activation, and based on DCI indication (see Fig.13A ). The indicated TCI state corresponding to the CORESET pool index of the first value may also be referred to as the first TCI state.

[0314] The TCI code point indicated by the beam indication may also correspond to one TCI state (first joint TCI state) (refer to Fig. 13B ).

[0315] Regarding multi-TRP based on multi-DCI, in the case of joint TCI state, for the CORESET pool index of the second value (e.g., 1), the UE may also be configured based on TCI state, based on RRC, based on MAC CE activation, and based on DCI indication (see Fig.14A ). The indicated TCI state corresponding to the CORESET pool index of the second value may also be referred to as the second TCI state.

[0316] The TCI code point indicated by the beam indication may also correspond to one TCI state (second joint TCI state) (refer to Fig. 14B ).

[0317] When the DCI corresponding to each CORESET pool index indicates the same TCI state (TCI state ID) (for example, indicating Fig. 13B as well as Fig. 14B In the case of TCI state #7 corresponding to TCI code point "111", the UE may also determine that 1 TCI state is indicated. At this time, the UE may also perform operations using a single TRP.

[0318] In addition, regarding the above-mentioned multi-TRP based on multi-DCI, an example using a joint TCI state is described, but it can also be appropriately applied to situations where a separate TCI state is used.

[0319] In the present disclosure, the indicated TCI state, Rel.17TCI state, common TCI state, and unified TCI state may also be overwritten with each other. In the present disclosure, the common TCI state, Rel.17TCI state, and Rel.18TCI state applied to channels / signals using multiple TRPs may also be overwritten with each other.

[0320] The UE may also apply the indicated TCI state to a specific channel / signal.

[0321] The specific channel / signal may also be a UE-specific (dedicated) DL channel / signal. The UE-specific DL channel / signal may also be a UE-specific PDCCH / PDSCH / CSI-RS (eg, aperiodic (A-) CSI-RS).

[0322] The specific channel / signal may also be a specific UL channel / signal. The specific UL channel / signal may also be at least one of a PUSCH indicated by DCI (indicated by dynamic grant), a set grant PUSCH, multiple (all) specific PUCCHs (resources), and an SRS (e.g., aperiodic (A-) SRS).

[0323] One or more (for example, 2) indicated TCI states may also be indicated based on the method described in the above-mentioned 0th embodiment.

[0324] The following embodiments of the present disclosure can also be applied to PDSCH of a single TRP.

[0325] The PDSCH of a single TRP may also be scheduled by a specific DCI (DCI format). The specific DCI format may also be, for example, DCI format 1_0 (or a DCI format that does not include a TCI field). The specific DCI format may also be DCI format 1_1 / 1-2. The specific DCI format may also indicate 1 TCI state.

[0326] The QCL assumption for PDSCH of a single TRP may also be a default TCI state. The default TCI state may also be 1 TCI state (in any DCI format).

[0327] It is also possible not to set up repeated transmission of multiple TRPs for the UE. In this case, the PDSCH of a single TRP can also be scheduled as a PDSCH of a single-layer MIMO (with single layer MIMO).

[0328] The PDSCH of a single TRP may also be the PDSCH when multiple TRPs (for example, CORESET pool index) are not set for the UE.

[0329] The PDSCH of a single TRP may be a PDSCH scheduled by at least a CORESET of a CSS. The PDSCH of a single TRP may be a PDSCH scheduled by a CORESET of only a CSS (or a CSS excluding a type 3 CSS).

[0330] The following embodiments of the present disclosure can also be applied to PDSCH of multiple TRPs.

[0331] The PDSCH of a single TRP may also be scheduled through a specific DCI (DCI format). The specific DCI format may also be DCI format 1_1 / 1-2. The specific DCI format may also indicate 2 TCI states.

[0332] The QCL assumption of PDSCH of multiple TRPs can also be the default TCI state. The default TCI state can also be 2 TCI states (in any DCI format).

[0333] It is also possible not to set up repeated transmission of multiple TRPs for the UE. In this case, the PDSCH of multiple TRPs can also be scheduled as a PDSCH of multi-layer MIMO (with multi layer MIMO).

[0334] The PDSCH of multiple TRPs may also be the PDSCH when repeated transmission of multiple TRPs is set for the UE. In this case, the PDSCH of multiple TRPs may also be scheduled as a PDSCH that is repeatedly transmitted (using TDM / FDM / SDM) (with repetition).

[0335] The PDSCH of multiple TRPs may also be the PDSCH when SFN scheme A / B is set for the UE. The PDSCH of multiple TRPs may also be the PDSCH with multiple TCI states.

[0336] The following embodiments of the present disclosure may also be applied to PDCCH of a single TRP.

[0337] The PDCCH of a single TRP may also be a PDCCH associated with a CORESET in which SFN scheme A / B is not configured.

[0338] The PDCCH of a single TRP may also be a PDCCH associated with a CORESET that is not configured for repeated transmission (of 2 linked SSs).

[0339] The following embodiments of the present disclosure may also be applied to PDCCH of multiple TRPs.

[0340] The PDCCH of multiple TRPs may also be a PDCCH associated with the CORESET to which SFN scheme A / B is set.

[0341] The following embodiments of the present disclosure can also be applied to PUSCH / PUCCH of a single TRP.

[0342] The PUSCH / PUCCH of a single TRP may also be a PUSCH / PUCCH that is repeatedly transmitted without setting multiple TRPs.

[0343] The following embodiments of the present disclosure can also be applied to PUSCH / PUCCH of multiple TRPs.

[0344] The PUSCH / PUCCH of multiple TRPs may be a PUSCH / PUCCH for which multiple TRPs are set for repeated transmission.

[0345] The following embodiments of the present disclosure may also be applied to CSI-RS / SRS of single / multiple TRPs.

[0346] In the present disclosure, the transmission and reception using a single TRP, the single TRP mode, and the channels / signals using a single TRP may also be overwritten with each other. In the present disclosure, the transmission and reception using multiple TRPs, the multiple TRP modes, and the channels / signals using multiple TRPs may also be overwritten with each other. In the present disclosure, single / multiple TRPs are set / indicated, the transmission and reception of single / multiple TRPs are set / indicated, the single / multiple TRP modes are set / indicated, and the channels / signals using single / multiple TRPs are set / indicated / scheduled / triggered, and these may also be overwritten with each other.

[0347] In the present disclosure, scheduling, triggering, indicating, setting, and activating can also be overwritten with each other.

[0348] <First embodiment>

[0349] In the first embodiment, a TCI field included in DCI is described.

[0350] The number of bits of the TCI field included in the beam indication DCI may also be a specific value (eg, a fixed value).

[0351] This specific value may also be set to the UE using higher layer signaling (RRC signaling).

[0352] The UE may also receive multiple DCIs for scheduling multiple PDSCHs. Here, one DCI may schedule one PDSCH.

[0353] The UE may also send HARQ-ACK associated with multiple PDSCHs in one transmission opportunity.

[0354] In the present disclosure, the transmission opportunities (of HARQ-ACK), PUSCH, PUCCH, PUSCH / PUCCH resources, and time slots may also be rewritten mutually.

[0355] When the UE sends HARQ-ACK associated with multiple PDSCHs in one transmission opportunity, it is also possible that only the TCI field of one DCI (the TCI field used as beam indication) among the DCIs that schedule the multiple PDSCHs is valid, and the TCI fields of other DCIs (the TCI fields used as beam indications) are invalid.

[0356] The DCI in which the TCI field is set to be valid may also be any DCI among the multiple DCIs. In the present disclosure, the DCI (in which the TCI field is set to be valid) using the TCI field (for example, the above Figure 8DCI#4) can also be called "specific DCI".

[0357] One or more DCIs that do not use the TCI field (the TCI field is set to invalid) (for example, the above Figure 8 The TCI field included in the DCI #1-#3 of the DCI may also be used for different purposes / applications. In the present disclosure, the DCI that does not use the TCI field (the TCI field is set to invalid) (for example, the above Figure 8 DCI#1-3) can also be called "other DCI".

[0358] In the present disclosure, "the TCI field is set to be valid", "the TCI field is used", and "the TCI field is used as the TCI field for beam indication" can also be rewritten.

[0359] In the present disclosure, "the TCI field is set to invalid", "the TCI field is not used", and "the TCI field is not used as the TCI field for beam indication" can also be rewritten.

[0360] The following describes the indication of the TCI state of each scheduled / triggered channel / signal (e.g., scheduled PDSCH / PUSCH, and at least one of the triggered aperiodic (A-)SRS / A-CSI-RS / PUCCH (e.g., HARQ-ACK)).

[0361] Alternatively, one or more (for example, two) TCI states may be indicated to the UE through beam indication DCI. The TCI state may also be an "indicated TCI state". The "indicated TCI state" may also be applied after BAT (in the next time slot) as described above.

[0362] The UE may also receive DCI (scheduling / triggering DCI) for scheduling / triggering each channel / signal. The scheduling / triggering DCI may be the same DCI as the beam indication DCI or a different DCI.

[0363] Regarding the TCI field of the DCI (scheduling / triggering DCI) that does not indicate the "indicated TCI state", the UE may also follow at least one of the following options 1-A and 1-B.

[0364] [Option 1-A]

[0365] When the "indicated TCI state" is applied to the channel / signal and multiple (for example, 2) "indicated TCI states" are indicated, the UE can also select / determine 1 TCI state among the multiple "indicated TCI states" based on the scheduling / triggering DCI ("other DCI").

[0366] The TCI field included in the scheduling / triggering DCI may also indicate which of multiple indicated TCI states is to be applied.

[0367] In the case where there is only one "indicated TCI state" and the one indicated TCI state is applied to the channel / signal, the UE may also ignore the TCI field in the scheduling / triggering DCI ("other DCI").

[0368] Figures 15A-15D This is a diagram showing an example of an indication of the TCI status involved in option 1-A / 1-B.

[0369] like Fig.15A As shown, the UE may also be indicated with multiple "indicated TCI states" via the beam indication DCI. Fig.15A The example shown is the following state: for the UE, TCI state #1 is indicated as the first TCI state, and TCI state #2 is indicated as the second TCI state.

[0370] In addition, Fig.15A In the example shown, the joint / (individual) DL TCI state is shown as the indicated TCI state, but the indicated TCI state may also be the (individual) UL TCI state.

[0371] Fig. 15B This is an example of a TCI field included in a "specific DCI". Fig. 15B In the TCI field included in a specific DCI, the TCI field indicates the "indicated TCI state". Based on the TCI field included in the specific DCI, the UE starts applying the "indicated TCI state" based on the TCI field after the BAT has passed since the HARQ-ACK associated with the specific DCI was sent (the last symbol of the PUSCH / PUCCH that sent the HARQ-ACK). In other words, the UE starts applying the "indicated TCI state" based on the TCI field. Fig.15A The "indicated TCI status" as shown in the figure is changed / updated to apply as shown in the figure. Fig. 15B The state of "indicated TCI state" as shown.

[0372] Fig. 15C is a diagram showing an example of the TCI field involved in Option 1-A. Fig. 15C In the example shown, (the interpretation of) the TCI field included in the scheduling / triggering DCI (particularly, "other DCI") is recorded.

[0373] exist Fig. 15CIn the example shown, the UE determines the TCI state applied to each channel / signal based on the TCI field included in the scheduling / triggering DCI of each channel / signal.

[0374] At this time, the UE can also determine, based on the TCI field, any TCI state in the "indicated TCI state" that the application has already started to apply.

[0375] exist Fig. 15C In the example shown, when the code point of the TCI field included in the scheduling / triggering DCI is "000", the UE determines that the first TCI state (ie, Fig.15A In addition, when the code point of the TCI field contained in the scheduling / triggering DCI is "001", the UE determines that the second TCI state (i.e., Fig.15A TCI state #2 in DCI is applied to the channel / signal corresponding to the DCI.

[0376] At this time, the UE may not assume / expect to receive the following DCI: the DCI includes a TCI field, and the TCI field indicates a code point that does not indicate any of the multiple "indicated TCI states" (for example, Fig. 15C In the example, code points are "010" to "111").

[0377] [Option 1-B]

[0378] A list of TCI states may also be set for the UE. The list may also include multiple TCI states. As mentioned above, the list of TCI states may also be set using RRC signaling. The TCI state may also be referred to as a "set TCI state".

[0379] In addition, the UE may also be configured with a list of TCI states, and one or more TCI states may be activated from the list. As described above, the TCI state may also be activated using a MAC CE. The TCI state may also be referred to as a "configured TCI state".

[0380] The UE may also apply at least one of the "set TCI states" to each channel / signal. At this time, the UE may also apply one or more (e.g., 2) TCI states in the "set TCI states" based on the TCI field included in the scheduling / triggering DCI (especially, "other DCI") of the channel / signal.

[0381] Fig.15D This is a diagram showing an example of the TCI field involved in Option 1-B. Fig.15DIn the example shown, the TCI field included in the scheduling / triggering DCI (particularly, "other DCI") is recorded.

[0382] exist Fig.15D In the example shown, the UE determines the TCI state applied to each channel / signal based on the TCI field included in the scheduling / triggering DCI of each channel / signal.

[0383] exist Fig.15D For example, when the code point of the TCI field contained in the scheduling / triggering DCI is "000", the UE determines that TCI state #16 in the set TCI state is applied to the channel / signal scheduled / triggered by the DCI.

[0384] Fig.16 FIG. 1 is a diagram showing an example of application of the TCI state according to the first embodiment. Fig.16 The reception of DCI and the scheduling of PDSCH in Figure 8 It's the same.

[0385] The UE applies to PDSCH#1-PDSCH#3 respectively based on the TCI field included in DCI#1-#3. As mentioned above, DCI#1-#3 is DCI in which the TCI field included in the DCI is not used to indicate the "indicated TCI state". Fig.16 In the example, DCI#1-#3 indicates TCI state #1, so the UE applies TCI state #1 to PDSCH#1-PDSCH#3.

[0386] The UE determines that the TCI state indicated by DCI#4 will be applied (in the next time slot) after BAT (BeamAppTime_r17) has passed since the transmission of the HARQ-ACK associated with the DCI (the last codeword of the PUSCH / PUCCH that sends the HARQ-ACK).

[0387] In addition, the above-mentioned "specific DCI" and the above-mentioned "other DCI" may also correspond to the same HARQ-ACK (transmission opportunity (PUSCH / PUCCH / time slot) for sending HARQ-ACK). At this time, based on the time / frequency domain resources of multiple DCIs (PDCCH / CORESET / search space) corresponding to the same HARQ-ACK, it is determined whether any one of the multiple DCIs is the above-mentioned "specific DCI" and the above-mentioned "other DCI".

[0388] For example, the specific DCI may also be the earliest / latest DCI in the time domain among multiple DCIs (PDCCH / CORESET / search space that transmits multiple DCIs respectively). For example, the specific DCI may also be the DCI with the lowest / highest CC (component carrier) index (or CCE (control channel element) index) in the frequency domain among multiple DCIs (PDCCH / CORESET / search space that transmits multiple DCIs respectively). In addition, the specific DCI may also be determined according to a rule for selecting one DCI for determining a PUCCH resource indication (for example, a rule based on a CCE index / PRI (PUCCH resource indicator)). In addition, at least two of these rules may also be applied in combination.

[0389] According to the above first embodiment, even when multiple DCIs for scheduling / triggering multiple channels / signals are received, it is possible to appropriately determine whether to apply the TCI state to each channel / signal and to start application of the common TCI state.

[0390] In addition, the above-mentioned first embodiment can also be applied to at least one of a case where a single TRP is set (single TRP mode) and a case where multiple TRPs are set (multiple TRP mode).

[0391] <Modification of the first embodiment>

[0392] Regarding the "indicated TCI state" in Rel.17, it is envisaged that the "indicated TCI state" cannot be controlled by scheduling / triggering DCI.

[0393] In this case, a delay in beam instruction occurs, which becomes a problem.

[0394] Therefore, a method for solving the problems involved is described below.

[0395] A set including one or more common TCI states ("indicated TCI states") may also be indicated to the UE. One or more of the sets may also be indicated to the UE.

[0396] This indication may be performed using MAC CE / DCI, for example.

[0397] One or more of the sets are indicated to the UE through beam indication DCI (eg, DCI format 1_1 / 1_2 with / without DL allocation).

[0398] In the case of indicating multiple sets, the TCI status of the scheduled / triggered channel / signal may be indicated to the UE via the scheduling / triggering DCI (for example, DCI format 0_1 / 0_2 / 1_1 / 1_2).

[0399] At this time, the indicated TCI state may also be indicated by multiple DCIs (ie, beam indication DCI and scheduling / triggering DCI). Such indication may also be referred to as a 2-stage (step) DCI indication.

[0400] Fig.17 FIG. 1 is a diagram showing an example of an indication of a TCI state according to a modification of the first embodiment. Fig.17 In the example shown, multiple TCI states are set / activated for the UE using RRC signaling / MAC CE.

[0401] exist Fig.17 In the example shown, the UE is indicated multiple sets of TCI states using MAC CE / DCI (DCI#1). The DCI#1 may also be, for example, a beam indication DCI. Next, the UE is indicated two TCI states (a first joint TCI state and a second joint TCI state) using DCI#2. The DCI#2 may also be, for example, a scheduling / triggering DCI.

[0402] In addition, Fig.17 In the example, an example of multiple (2) TCI states in multiple TRPs (modes) is recorded, and this variation can also be applied to a single TRP (mode).

[0403] Fig.18 FIG. 2 is a diagram showing another example of an indication of a TCI state according to a modification of the first embodiment. Fig.18 In the example shown, the UE receives DCI#1 as a beam indication DCI. After a specific period (BAT) has passed since the transmission of the HARQ-ACK associated with DCI#1 (the last symbol of the PUSCH / PUCCH that transmits the HARQ-ACK), the TCI state indicated by DCI#1 begins to be applied (in the next time slot).

[0404] Thereafter, the UE receives DCI#2 which is the scheduling DCI of PDSCH#2.

[0405] exist Fig.18 In the example shown, the two-stage DCI indication indicates the TCI state applied to PDSCH #2 based on the TCI field included in each of DCI #1 and DCI #2.

[0406] Fig.19 This is a diagram showing another example of the indication of the TCI state involved in the modification example of the first embodiment. Fig.19 The correspondence between the code point of the TCI field and the TCI status is shown in FIG.

[0407] exist Fig.19In the example shown, four sets (sets 1 to 4) are indicated to the UE. In the two-stage DCI indication, the UE indicates the DCI via beams (e.g., Fig.18 The DCI#1 in the above example is indicated by the code point of the TCI field. Fig.18 Based on a specific field (e.g., TCI field) contained in DCI#2 in the UE, the UE is indicated to 1 of the 4 sets.

[0408] In this way, by applying the two-stage DCI indication, the size of the TCI field can be reduced.

[0409] In Rel.15, regarding DCI format 1_1, the number of bits of the TCI field can be set to 3 bits through RRC.

[0410] In Rel.16, regarding DCI format 1_2, the number of bits of the TCI field can be set to 0 to 3 bits through RRC.

[0411] When two-stage DCI indication is supported, the number of TCI states can be reduced.

[0412] For example, when 2-stage DCI indication is not supported (i.e., it can also be called indication based on existing DCI, 1-stage (step) DCI indication), since the 3-bit TCI field of the beam indication DCI is utilized, 1 TCI state can be selected from a maximum of 8 TCI states.

[0413] On the other hand, when supporting two-stage DCI indication, the 3-bit TCI field of the beam indication DCI and the 3-bit TCI field of the scheduling / trigger DCI can be used, so that one TCI state can be selected from a maximum of 64 TCI states.

[0414] This means that when applying 2-stage DCI indication based on the same flexibility (i.e., selecting 1 TCI state from a maximum of 8 TCI states), the number of bits of the TCI field included in each DCI can be reduced compared to when applying 1-stage DCI indication.

[0415] In addition, in the above-mentioned two-stage DCI indication, the beam indication DCI and the scheduling / triggering DCI can also overwrite each other.

[0416] In addition, the "indicated TCI state" may be shared among different channels / signals. When the UE does not receive DCI (eg, scheduling / triggering DCI) for indicating one set from a set of multiple TCI states, the UE may decide to select a specific set.

[0417] The specific set may also be specified in advance in the specification. The specific set may also be, for example, a set with the lowest (or largest) index.

[0418] In addition, the specific set may also be set to the UE (as a default) using higher layer signaling (RRC).

[0419] In addition, this variant example can also be applied only when multiple sets (of TCI states) are indicated (set) to the UE.

[0420] <Second embodiment>

[0421] To support multi-TRP operation, a larger number of DCI bits are required than when using a single TRP (see Fig. 20 ).like Fig. 20 As shown, the DCI when utilizing multiple TRPs may also include fields / information that are used only in the multiple TRP mode.

[0422] For example, in order to support the repetition of PUSCH of multiple TRPs, consider that at least one of the following is required in the scheduling DCI (e.g., DCI format 0_1 / 0_2): a field for switching single TRP and multiple TRPs, a field for switching SRI, and a field for switching TPMI.

[0423] Therefore, in the present embodiment, a method for solving the above-mentioned problem will be described below.

[0424] It is also possible to set multiple TRP (mode) / single TRP (mode) for the UE. In this case, the size of the DCI can also be determined by the multiple TRP mode.

[0425] For example, when multi-TRP (mode) / single TRP (mode) is set for the UE, the size of the DCI in the single TRP mode can also be determined based on the size of the DCI in the multi-TRP mode.

[0426] For example, when multi-TRP (mode) / single TRP (mode) is set for the UE, the size of the DCI in the single TRP mode may be the same as the size of the DCI in the multi-TRP mode.

[0427] At this time, the common TCI state may not be applied to a specific channel (for example, repeated PUSCH of multiple TRPs). For example, the spatial relationship specified in Rel.15 / 16 may be applied to the channel.

[0428] The application of the common TCI state can also be set for the UE (as well as the transmission and reception (scheme) of channels (PDSCH / PDCCH / PUSCH / PUCCH) using multiple TRPs). At this time, when the single TRP mode is indicated by DCI, the UE can also ignore the specific fields contained in the DCI (or not use the specific fields).

[0429] 《Switching between single and multiple TRP (modes)》

[0430] After Rel.18, dynamic switching between single TRP (mode) and multiple TRP (modes) can also be supported.

[0431] The switching may also be performed through DCI. The DCI field may also be included in a specific DCI. For example, the specific DCI may be a DCI for scheduling PDSCH / PUSCH (eg, DCI format 0_0 / 0_1 / 0_2 / 1_0 / 1_1 / 1_2), or a beam indication DCI.

[0432] This switching can also be performed using, for example, the TCI field. The UE can also determine single TRP (mode) / multiple TRP (mode) based on the number of TCI states corresponding to one TCI code point.

[0433] Fig.21A This is a diagram showing an example of switching between a single TRP and a multi-TRP according to the second embodiment. Fig.21A The correspondence between the code points of the TCI field and one or more (2) TCI states as shown.

[0434] This correspondence may be pre-specified in the specification, or may be set to the UE using higher-layer signaling (RRC / MAC CE).

[0435] When the code point of the indicated TCI field corresponds to one TCI state (i.e., code points "000" to "011"), the UE determines that it is a single TRP mode. In addition, when the code point of the indicated TCI field corresponds to two TCI states (i.e., code points "100" to "111"), the UE determines that it is a multi-TRP mode.

[0436] In addition, for each channel / signal, a DCI field for indicating at least one of the following may also be specified: whether it is a single TRP (mode) or multiple TRPs (modes), and the order of the indicated TCI states. In the present disclosure, this DCI field may also be referred to as a new DCI field.

[0437] In addition, when the code point of the indicated TCI field corresponds to the same two TCI states, the UE can also be judged as a single TRP mode. In addition, when the code point of the indicated TCI field corresponds to two different TCI states, the UE can also be judged as a multi-TRP mode.

[0438] Figure 21B-Figure 21D This is another example of switching between single TRP and multi-TRP involved in the second embodiment. Figure 21B-Figure 21D The correspondence between the code points of the DCI field and one or more (2) TCI states as shown.

[0439] This correspondence may be pre-specified in the specification, or may be set to the UE using higher-layer signaling (RRC / MAC CE).

[0440] exist Fig.21B In the example shown, the correspondence between the code points of the DCI field and the indications related to the TCI status is shown.

[0441] Fig.21B In the example shown, when the code point of the DCI field indicates "00", it means that the channel / signal associated with the DCI is a single TRP transmission, and the first TCI state is applied. In addition, when the code point of the DCI field indicates "01", it indicates the following situation: the channel / signal associated with the DCI is a single TRP transmission, and the second TCI state is applied.

[0442] In addition, when the code point of the DCI field indicates "10", it indicates the following situation: the channel / signal associated with the DCI is a multi-TRP transmission, and the TCI state is applied in the order of the first TCI state and the second TCI state in the ascending order of the index of each channel / signal. In addition, when the code point of the DCI field indicates "11", it indicates the following situation: the channel / signal associated with the DCI is a multi-TRP transmission, and the TCI state is applied in the order of the second TCI state and the first TCI state in the ascending order of the index of each channel / signal.

[0443] exist Fig. 21C as well as Fig.21D In the example shown, the correspondence between the code point of the DCI field for a single TRP and the indication related to the TCI state is shown. Fig. 21C In the example shown, the correspondence between the code point of the DCI field for a single TRP or multiple TRPs and the indication related to the TCI status is shown.

[0444] exist Fig. 21CIn the example shown, when the code point of the DCI field indicates "0", it indicates the following situation: the channel / signal associated with the DCI is a single TRP transmission, and the first TCI state is applied. In addition, when the code point of the DCI field indicates "1", it indicates the following situation: the channel / signal associated with the DCI is a single TRP transmission, and the second TCI state is applied.

[0445] exist Fig.21D In the example shown, when the code point of the DCI field indicates "0", it indicates the following situation: the channel / signal associated with the DCI is a single TRP transmission, and the first TCI state is applied. In addition, when the code point of the DCI field indicates "1", it indicates the following situation: the channel / signal associated with the DCI is a multi-TRP transmission, and the TCI state is applied in the order of the first TCI state and the second TCI state in ascending order of the index of each channel / signal.

[0446] In addition, in the above Figure 21A-Figure 21D In the above, "first" and "second" may be replaced with each other. In addition, the correspondence between the number of bits of the DCI field, the DCI code point, and the indication related to the TCI state is only an example and is not limited thereto.

[0447] 《Switching DCI Size》

[0448] The following describes the switching / updating of the DCI size (payload) accompanying the dynamic switching of the single TRP mode / multi-TRP mode.

[0449] The UE may also be indicated in single TRP mode / multiple TRP mode. This indication may also be made using DCI / MAC CE.

[0450] When the indicated mode is a mode different from the mode in which the UE is operating, the DCI size of the DL / UL DCI may also be changed / switched / updated (see Fig. 22 ).

[0451] For example, DL DCI may be DCI format 1_1 / 1_2, and UL DCI may be DCI format 0_1 / 0_2.

[0452] When a single TRP mode is indicated to the UE, the DCI size of the DL / UL DCI can be determined for the single TRP mode.

[0453] When a multi-TRP mode is indicated to the UE, the DCI size of the DL / UL DCI may also be determined for the multi-TRP mode.

[0454] The DCI size used in the single TRP mode may also be smaller than the DCI size used in the multi-TRP mode. The UE may also assume / expect that the DCI size used in the single TRP mode is smaller than the DCI size used in the multi-TRP mode.

[0455] For example, the TCI field included in the DCI for single TRP mode may also be X bits (for example, X=3). In addition, for example, the TCI field included in the DCI for multi-TRP mode may also be N×X bits (for example, X=3). N may also be the number of TRPs (for example, N=2).

[0456] In addition, the present embodiment may be applied when (only when) dynamic switching of the DCI size between the single TRP mode and the multi-TRP mode is set for the UE.

[0457] 《Blind Detection of DCI Format》

[0458] In blind detection of DCI formats, the UE and the network (eg, base station) need to have a common understanding of the size of the DCI.

[0459] Due to the above-mentioned switching of the DCI size, a difference (error) in the knowledge regarding the DCI size may occur between the UE and the network.

[0460] The following describes the timeline related to the switching of single / multiple TRP modes (and the switching of DCI sizes).

[0461] Similar to the BAT specified in Rel.17 mentioned above, the timing related to the switching of single / multiple TRP modes (and the switching of DCI sizes) can also be specified in the specifications.

[0462] The timing related to the switching of single / multiple TRP modes (and the switching of DCI size) can also be the same timeline as BAT. Alternatively, the timing related to the switching of single / multiple TRP modes (and the switching of DCI size) can also be a newly specified timeline (different from BAT).

[0463] In addition, the difference in understanding between the UE and the network regarding the "indicated TCI state" becomes a major problem, so by defining the BAT after HARQ-ACK is sent, the probability of error occurrence is reduced (for example, less than 0.1 percent). The same effect is achieved by also defining the timing related to the switching of single / multiple TRP modes (and the switching of DCI sizes).

[0464] The timing (first timing) of the application (start) of the mode indicated by the DCI and the timing (second timing) of the application (start) of the mode indicated by the MAC CE may also be the same. For example, the first timing and the second timing may be values ​​pre-defined in the specification, values ​​set by higher-layer signaling (RRC), or determined based on reported UE capability information.

[0465] The timing of application of the mode indicated by the DCI and the timing of application of the mode indicated by the MAC CE may also be specified separately. For example, at least one of the first timing and the second timing may be a value pre-specified in the specification, a value set by higher-layer signaling (RRC), or determined based on reported UE capability information. For example, the second timing may also be the next time slot after a specific time (e.g., Xms later (e.g., X=3)) from the transmission of the HARQ-ACK associated with the MAC CE (the final codeword of the PUSCH / PUCCH that transmits the HARQ-ACK).

[0466] Fig.23 This is a diagram showing an example of switching between single / multiple TRP modes involved in the second embodiment. Fig.23 In the embodiment of the present invention, when the UE is operating in a single TRP mode, a DCI indicating a multi-TRP mode is received. The UE receives a PDSCH scheduled by the DCI and sends a HARQ-ACK corresponding to the PDSCH.

[0467] At this time, the UE has a specific time ( Fig.23 After (the time provided by BeamAppTime_r17 in the next time slot), switch to the multi-TRP mode indicated by DCI.

[0468] Fig.24 This is a diagram showing another example of switching between single / multiple TRP modes involved in the second embodiment. Fig.24 In the present embodiment, when the UE is operating in single TRP mode, a MAC CE indicating multi-TRP mode is received in PDSCH. The UE sends a HARQ-ACK corresponding to the PDSCH.

[0469] At this time, the UE has a specific time ( Fig.24 In the next time slot (3ms), it switches to the multi-TRP mode indicated by MAC CE.

[0470] When HARQ-ACK associated with multiple DCIs are sent in the same transmission opportunity (PUSCH / PUCCH / time slot), the UE can also switch between single / multiple TRP modes according to the mode related to the TRP indicated by a specific DCI among the multiple DCIs.

[0471] For example, the specific DCI may also be determined based on time / frequency resources of multiple DCIs.

[0472] For example, the specific DCI may also be the earliest / latest DCI in the time domain among multiple DCIs (PDCCH / CORESET / search space that transmits multiple DCIs respectively). For example, the specific DCI may also be the DCI with the lowest / highest CC (component carrier) index (or CCE (control channel element) index) in the frequency domain among multiple DCIs (PDCCH / CORESET / search space that transmits multiple DCIs respectively). In addition, the specific DCI may also be determined according to a rule for selecting one DCI for determining a PUCCH resource indication (for example, a rule based on a CCE index / PRI (PUCCH resource indicator)). In addition, at least two of these rules may also be applied in combination.

[0473] Fig.25 This is a diagram showing another example of switching between single / multiple TRP modes involved in the second embodiment. Fig.25 The reception of DCI, scheduling / reception of PDSCH, and transmission of HARQ-ACK in Figure 8 same.

[0474] Fig.25 In the datagram, DCI#1-DCI#3 indicate single TRP mode, and DCI#4 indicates multi-TRP mode. Fig.25 In the multi-TRP mode indicated by the latest DCI #4 in the time domain, the UE receives the HARQ-ACK associated with DCI #1-#4 after a specific time ( Fig.25 In the process, after (the next time slot) the time passed by BeamAppTime_r17, it switches to multi-TRP mode.

[0475] in addition, Fig.25 The example shown shows an example of determining the DCI to be selected based on the time domain, but the method of selecting DCI is not limited to this.

[0476] When the single TRP mode and the multi-TRP mode are indicated / determined based on the number of TCI states, it is reasonable to use BAT to determine the DCI size (switching TRP mode). Fig.21A In the case of the DCI field recorded in , BAT can also be used to determine the DCI size (switch TRP mode).

[0477] When based on a specific DCI field (e.g. Fig.21B / C / D) to indicate / determine either the single TRP mode or the multi-TRP mode, the UE may also be specified to receive the DCI operation indicating the single TRP / multi-TRP mode.

[0478] The operation / mechanism may also be at least one of the following options 2-1 and 2-2.

[0479] [Option 2-1]

[0480] The UE may also determine / change / update the DCI size (TRP mode) after a specific time (e.g., Y symbols) has passed since the transmission of the HARQ-ACK associated with the DCI containing a specific field (the last symbol of the PUSCH / PUCCH that transmits the HARQ-ACK) (in the next time slot).

[0481] The Y can be specified in the specification in advance, or can be set to the UE through high-level signaling (RRC / MAC CE). The high-level signaling can be a new (Rel.18 and later) RRC parameter, or an RRC parameter related to BAT (for example, BeamAppTime_r17). In addition, the Y can also be reported as part of the UE capability.

[0482] In the above description, symbol is described as the unit of Y; however, the unit of Y may be, for example, subframe / slot / subslot / ms (millisecond).

[0483] [Option 2-2]

[0484] The UE may also determine / change / update the DCI size (TRP mode) after a specific time (e.g., BAT) has passed since the transmission of the HARQ-ACK associated with the beam indication DCI (the last codeword of the PUSCH / PUCCH that transmits the HARQ-ACK) (in the next time slot).

[0485] In other words, the DCI used for indicating / determining / changing the DCI size (TRP mode) may also be a beam indication DCI.

[0486] This beam indication DCI may be a DCI for indicating the "indicated TCI state", regardless of whether or not there is DL allocation.

[0487] Fig.26 This is a diagram showing another example of switching between single / multiple TRP modes involved in option 2-2. Fig.26 The reception of DCI, scheduling / reception of PDSCH, and transmission of HARQ-ACK in Fig.25 same.

[0488] Fig.26 In the example, DCI#1-DCI#3 indicates single TRP mode, and DCI#4 indicates multi-TRP mode. Fig.26 In the DCI#4, DCI#4 is a beam indication DCI used to indicate the TCI status ("indicated TCI status"). Fig.26 In the DCI#4, a new DCI field is included.

[0489] Fig.26 In the multi-TRP mode indicated by DCI#4 which is a beam indication DCI, the UE receives a specific time ( Fig.26 In the process, after (the next time slot) the time provided by BeamAppTime_r17, it switches to multi-TRP mode.

[0490] According to the above second embodiment, the size of DCI can be appropriately determined / controlled in the case of using a single TRP and in the case of using multiple TRPs.

[0491] <Modification>

[0492] The various embodiments / options / selections of the present disclosure may also be supported in intra-cell / inter-cell beam indication.

[0493] In each embodiment / option / selection of the present disclosure, the TRP-specific (supplemented) Transmitted Precoding Matrix Indicator (TPMI) field / SRI field for PUSCH using multiple TRPs in Rel.17 may also be used.

[0494] <Supplement>

[0495] At least one of the above-mentioned implementation modes may also be applied only to a UE that reports a specific UE capability (UE capability) or supports the specific UE capability.

[0496] The specific UE capability may also represent at least one of the following:

[0497] Supporting specific processing / operation / control / information related to at least one of the above-mentioned embodiments.

[0498] Support (dynamic) beam indication of scheduled / triggered channels / signals (eg as described in the first embodiment).

[0499] Support (dynamic) switching of DCI size between single TRP mode and multi-TRP mode.

[0500] Supporting a set of multiple TCI states (eg, as described in the variation of the first embodiment).

[0501] The (dynamic) switching of DCI size between single TRP mode and multi-TRP mode is supported. It can be reported (independently) for each UL DCI, or reported (independently) for each DL DCI, or reported in aggregate for UL DCI and DL DCI.

[0502] The (dynamic) switching of DCI size between single TRP mode and multi-TRP mode is supported. It can be reported (independently) for each joint TCI state, or for each individual TCI state (independently), or it can be reported in a summary manner for the joint TCI state and the individual TCI state.

[0503] The situation where multiple TCI state sets are supported can also be reported using the number of sets.

[0504] In addition, the above-mentioned specific UE capabilities can be capabilities that are applied throughout the entire frequency (commonly regardless of the frequency), or capabilities for each frequency (for example, cell, band, BWP), or capabilities for each frequency range (for example, Frequency Range 1 (FR1)), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities for each subcarrier spacing (SubCarrier Spacing (SCS)).

[0505] In addition, the above-mentioned specific UE capabilities can be capabilities applied across full-duplex modes (commonly regardless of the duplex mode) or capabilities for each duplex mode (for example, time division duplex (TDD) and frequency division duplex (FDD)).

[0506] In addition, at least one of the above-mentioned embodiments may also be applied when the UE is configured with specific information associated with the above-mentioned embodiments through high-layer signaling. For example, the specific information may also be information indicating activation of a common TCI state, any RRC parameter for a specific version (e.g., Rel.18), etc.

[0507] Even if the UE does not support at least one of the above-mentioned specific UE capabilities or is not configured with the above-mentioned specific information, the operations of Rel.15 / 16 / 17, for example, may be applied.

[0508] (Supplement A)

[0509] The following inventions are added to one embodiment of the present disclosure.

[0510] The terminal comprises: a receiving unit for receiving a first downlink control information (DCI) for scheduling a signal corresponding to a transmission opportunity of a hybrid automatic repeat request acknowledgment (HARQ-ACK) and a second DCI for a beam indication corresponding to the transmission opportunity; and a control unit for determining a first TCI state to be applied to the signal based on a first transmission configuration indication (TCI) field included in the first DCI, and determining a second TCI state to be applied after a specific period has passed since the last codeword of the transmission opportunity based on a second TCI field included in the second DCI, wherein each of the first TCI state and the second TCI state is a TCI state applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state applied to a DL signal and a TCI state applied to a UL signal.

[0511] [Note 2]

[0512] As for the terminal recorded in Note 1, the control unit applies any one of the multiple TCI states for multiple signals that have already been applied as the first TCI state to the channel based on the first TCI field.

[0513] [Note 3]

[0514] For the terminal as recorded in Note 1 or Note 2, the control unit applies any one of the multiple TCI states set using high-layer signaling as the first TCI state to the channel based on the first TCI field.

[0515] [Note 4]

[0516] For the terminal as recorded in any one of Notes 1 to 3, the receiving unit further receives a third DCI for scheduling a signal different from the signal after the specific period has passed, the third DCI including a field related to an indication of a set of TCI states, and the control unit further determines a third TCI state applied to the different signal based on the second DCI and the third DCI.

[0517] (Supplementary Note B)

[0518] The following inventions are added to one embodiment of the present disclosure.

[0519] [Note 1]

[0520] The terminal comprises: a receiving unit, which receives indication information for indicating any one of transmission and reception using a single transmission and reception point (TRP) and transmission and reception using multiple TRPs; and a control unit, which determines at least one of the following based on the indication information: a first switch related to transmission and reception using the single TRP and transmission and reception using multiple TRPs, and at least one of a second switch related to the size of downlink control information (DCI), and the transmission setting indication (TCI) state indicated by the indication information is a TCI state applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state applied to a DL signal and a TCI state applied to a UL signal.

[0521] [Note 2]

[0522] As for the terminal recorded in Note 1, the control unit determines at least one of the first switch and the second switch based on the number of TCI states corresponding to the code points of the TCI field contained in the indication information.

[0523] [Note 3]

[0524] For a terminal as recorded in Note 1 or Note 2, the control unit determines at least one of the first switch and the second switch based on a field contained in the indication information, wherein the field represents at least one of the following: information used to represent any one of sending and receiving using the single TRP and sending and receiving using the multiple TRPs, and information related to the application of the TCI state.

[0525] [Note 4]

[0526] In the terminal as described in any one of Notes 1 to 3, the control unit performs at least one of the first switching and the second switching at the timing when the application of the TCI state indicated by the indication information starts.

[0527] (Wireless Communication System)

[0528] The following describes a configuration of a wireless communication system according to an embodiment of the present disclosure. In the wireless communication system, communication is performed using one or a combination of the wireless communication methods according to the above-described embodiments of the present disclosure.

[0529] Fig. 27 1 is a diagram showing an example of a schematic structure of a wireless communication system according to an embodiment of the present invention. The wireless communication system 1 may be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system (5GNR), or the like.

[0530] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0531] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0532] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0533] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0534] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0535] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (lower than 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (higher than 24 GHz (above-24 GHz)). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0536] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0537] Multiple base stations 10 may also be connected via wired (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0538] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also 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.

[0539] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0540] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. may be used.

[0541] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0542] In the wireless communication system 1, as downlink channels, 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)) and the like may be used.

[0543] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like may be used as uplink channels.

[0544] The PDSCH transmits user data, high-layer control information, system information block (SIB), etc. The PUSCH transmits user data, high-layer control information, etc. In addition, the PBCH transmits the master information block (MIB).

[0545] The PDCCH may also transmit lower layer control information. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0546] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be rewritten as DL data, and the PUSCH may also be rewritten as UL data.

[0547] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0548] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be rewritten mutually.

[0549] Through PUCCH, uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also called hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.) and scheduling request (SR) can also be transmitted. Through PRACH, random access preambles for establishing a connection with a cell can also be transmitted.

[0550] In the present disclosure, downlink, uplink, etc. may be expressed without "link". In addition, various channels may be expressed without "Physical" at the beginning.

[0551] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may also be transmitted as DL-RS.

[0552] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0553] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0554] (Base Station)

[0555] Fig.281 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0556] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0557] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0558] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0559] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0560] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0561] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0562] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0563] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0564] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0565] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (Discrete Fourier Transform (DFT)) processing (as needed), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0566] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0567] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0568] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0569] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0570] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0571] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0572] The transmitting and receiving unit 120 may also transmit a first downlink control information (DCI) for scheduling a signal corresponding to a transmission opportunity of a hybrid automatic repeat request acknowledgment (HARQ-ACK), and a second DCI for a beam indication corresponding to the transmission opportunity. The control unit 110 may also use a first transmission configuration indication (TCI) field included in the first DCI to indicate a first TCI state applied to the signal, and use a second TCI field included in the second DCI to indicate a second TCI state that is applied after a specific period has passed from the last codeword of the transmission opportunity. Each of the first TCI state and the second TCI state may also be a TCI state applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state applied to a DL signal and a TCI state applied to a UL signal (first embodiment).

[0573] The sending and receiving unit 120 may also send indication information for indicating any one of sending and receiving using a single sending and receiving point (TRP) and sending and receiving using multiple TRPs. The control unit 110 may also use the indication information to indicate at least one of the following: a first switch related to sending and receiving using the single TRP and sending and receiving using the multiple TRPs, and a second switch related to the size of downlink control information (DCI). The transmission configuration indication (TCI) state indicated by the indication information is a TCI state applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state applied to a DL signal and a TCI state applied to a UL signal (second embodiment).

[0574] (User Terminal)

[0575] Fig.29 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided in one or more pieces.

[0576] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0577] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0578] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0579] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0580] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0581] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0582] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0583] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0584] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0585] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0586] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0587] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0588] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0589] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0590] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0591] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0592] The transmitting and receiving unit 220 may also receive a first downlink control information (DCI) for scheduling a signal corresponding to a transmission opportunity of a hybrid automatic repeat request acknowledgment (HARQ-ACK), and a second DCI for a beam indication corresponding to the transmission opportunity. The control unit 210 may also determine a first TCI state applied to the signal based on a first transmission configuration indication (TCI) field included in the first DCI, and determine a second TCI state to be applied after a specific period has passed from the last codeword of the transmission opportunity based on a second TCI field included in the second DCI. Each of the first TCI state and the second TCI state may also be a TCI state applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state applied to a DL signal and a TCI state applied to a UL signal (first embodiment).

[0593] The control unit 210 may also apply any one of the multiple TCI states for multiple signals that have already been applied as the first TCI state to the channel based on the first TCI field (first implementation manner).

[0594] The control unit 210 may also apply any one of a plurality of TCI states set using higher layer signaling as the first TCI state to the channel based on the first TCI field (first implementation manner).

[0595] The sending and receiving unit 220 may also further receive a third DCI for scheduling a signal different from the signal after the specific period has passed. The third DCI may also include a field related to an indication of a set of TCI states. The control unit 210 may also further determine a third TCI state applied to the different signal based on the second DCI and the third DCI (first embodiment).

[0596] The sending and receiving unit 220 may also receive indication information for indicating any one of sending and receiving using a single sending and receiving point (TRP) and sending and receiving using multiple TRPs. The control unit 210 may also determine at least one of the following based on the indication information: a first switch related to sending and receiving using the single TRP and sending and receiving using the multiple TRPs, and a second switch related to the size of the downlink control information (DCI). The transmission configuration indication (TCI) state indicated by the indication information is a TCI state applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state applied to a DL signal and a TCI state applied to a UL signal (second embodiment).

[0597] The control unit 210 may also determine at least one of the first switching and the second switching based on the number of TCI states corresponding to the code points of the TCI field included in the indication information (second implementation).

[0598] The control unit 210 may also determine at least one of the first switch and the second switch based on a field contained in the indication information, wherein the field represents at least one of the following: information used to represent any one of sending and receiving using the single TRP and sending and receiving using the multiple TRPs, and information related to the application of the TCI state (second embodiment).

[0599] The control unit 210 may also perform at least one of the first switching and the second switching at the timing when the application of the TCI state indicated by the indication information starts (second embodiment).

[0600] (Hardware Structure)

[0601] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0602] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method thereof is not particularly limited.

[0603] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.30 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0604] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. can be interchangeably used. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0605] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0606] Regarding the various functions in the base station 10 and the user terminal 20, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs calculations and controls the communication via the communication device 1004, or by controlling at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0607] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0608] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0609] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0610] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0611] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0612] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0613] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0614] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0615] (Variation Example)

[0616] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be rewritten with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0617] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0618] Here, the parameter set may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filtering process performed by a transmitter and receiver in the frequency domain, a specific windowing process performed by a transmitter and receiver in the time domain, and the like.

[0619] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0620] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of a smaller number of symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0621] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be replaced with each other.

[0622] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0623] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0624] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when 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.

[0625] In addition, when a time slot or a mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0626] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0627] In addition, a long TTI (e.g., normal TTI, subframe, etc.) can also be rewritten as a TTI with a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) can also be rewritten as a TTI with a TTI length shorter than that of the long TTI and longer than 1 ms.

[0628] 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 (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0629] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0630] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0631] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0632] A Bandwidth Part (BWP) (also referred to as a partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, a common RB may also be identified by an index of the RB relative to a common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0633] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0634] At least one of the set BWPs may be activated, and the UE may not assume that a specific signal / channel is transmitted or received outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0635] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0636] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0637] In the present disclosure, the names used for parameters, etc. are not restrictive in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not restrictive in all respects.

[0638] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0639] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0640] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0641] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0642] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0643] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0644] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0645] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0646] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0647] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0648] 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", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0649] In the present disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro-micro cell, and micro-micro cell.

[0650] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that performs communication services within the coverage area.

[0651] In the present disclosure, the fact that a base station sends information to a terminal may be mutually rewritten with the fact that the base station instructs the terminal to control / operate based on the information.

[0652] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0653] There are also cases where a mobile station is 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, hand set, user agent, mobile client, client or some other appropriate terminology.

[0654] At least one of the base station and the mobile station may also be referred to as a transmission device, a reception device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device mounted on a moving object, a moving object body, etc.

[0655] The mobile body refers to a movable object, and the moving speed is arbitrary, including the case where the mobile body is stopped. The mobile body includes, for example, vehicles, transport vehicles, cars, automatic two-wheeled vehicles (motorcycles), bicycles, connected cars, loading shovels, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, trolleys, rickshaws, ships (ships and other watercraft), airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, hot air balloons, and objects carried on them, but are not limited to these. In addition, the mobile body can also be a mobile body that drives autonomously based on operating instructions.

[0656] The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0657] Fig.31 1 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, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed 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.

[0658] The driving unit 41 is composed of at least one of an engine, a motor, or a combination of an engine and a motor. The steering unit 42 is composed of at least a steering wheel (also called a handle), and steers 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.

[0659] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be referred to as an electronic control unit (Electronic Control Unit (ECU)).

[0660] As signals from various sensors 50-58, there are the following signals, etc.: a current signal from a current sensor 50 for sensing the current of a motor, a speed signal of the front wheels 46 / rear wheels 47 obtained by a 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 an accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of a brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of a 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.

[0661] The information service unit 59 is composed of various devices such as a navigation system, an audio system, a speaker, a display, a television, and a radio for providing 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 obtained from an external device via the communication module 60, etc. to provide various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0662] The information service unit 59 may include input devices for accepting input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.), and may also include output devices for implementing output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0663] The driving assistance system unit 64 is composed of various devices for providing functions for preventing accidents before they happen or reducing the driver's driving burden, such as millimeter wave radar, light detection and ranging (LiDAR), camera, positioning detector (for example, Global Navigation Satellite System (GNSS)), map information (for example, High Definition (HD) map, Autonomous Vehicle (AV) map, etc.), gyroscope system (for example, inertial measurement unit (Inertial Measurement Unit (IMU))), inertial navigation unit (Inertial Navigation System (INS))), artificial intelligence (Artificial Intelligence (AI)) chip, AI processor, and one or more ECUs that control these devices. In addition, the driving assistance system unit 64 sends and receives various information via the communication module 60 to realize the driving assistance function or the automatic driving function.

[0664] The communication module 60 can communicate with the microprocessor 61 and the structural elements of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) between the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the microprocessor 61 and the memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 of the vehicle 40 via the communication port 63.

[0665] The communication module 60 can be controlled by the microprocessor 61 of the electronic control unit 49, and is a communication device that can communicate with an external device. For example, various information is sent and received with the external device via wireless communication. The communication module 60 can be inside or outside the electronic control unit 49. The external device can also be, for example, the above-mentioned base station 10, user terminal 20, etc. In addition, the communication module 60 can also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it can also function as at least one of the base station 10 and user terminal 20).

[0666] The communication module 60 may also transmit at least one of the signals from the various sensors 50-58 input to the electronic control unit 49, the information obtained based on the signals, and the information based on the input from the outside (user) obtained via the information service unit 59 to the external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may also be referred to as an input unit that receives input. For example, the PUSCH transmitted by the communication module 60 may also include information based on the above input.

[0667] The communication module 60 receives various information (traffic information, signal information, vehicle information, etc.) sent from an external device, and displays it on the information service unit 59 provided in the vehicle. The information service unit 59 may also be referred to as an output unit for outputting information (for example, outputting information to a display, a speaker, etc. based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0668] In addition, the communication module 60 stores various information received from the external device in the memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the various sensors 50-58, etc., which are provided in the vehicle 40.

[0669] In addition, the base station in the present disclosure may also be rewritten as a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink", "downlink", etc. may also be rewritten as terms corresponding to communication between terminals (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may also be rewritten as sidelink channels.

[0670] Likewise, the user terminal in the present disclosure may be rewritten as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0671] In the present disclosure, operations are assumed to be performed by a base station, and sometimes by its upper node depending on the situation. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal can obviously be performed by a base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0672] The various methods / implementations described in this disclosure may be used alone or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, timings, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the method described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0673] The various modes / implementations described in the present disclosure may also be applied to 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 a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems enhanced, modified, generated or specified based on them. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0674] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0675] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0676] The term "determining" used in the present disclosure may include a variety of actions. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0677] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0678] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as a situation where "judgment (decision)" is performed. That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as a situation where "judgment (decision)" is performed.

[0679] In addition, "judge (decide)" can also be rewritten as "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0680] The “maximum transmit power” recorded in the present disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated maximum transmit power).

[0681] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be rewritten as "access".

[0682] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., and as several non-limiting and non-inclusive examples, being "connected" or "combined" to each other using electromagnetic energy with a wavelength in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc.

[0683] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same manner as "different".

[0684] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0685] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0686] In the present disclosure, "below", "less than", "above", "more than", "equal to", etc. may also be rephrased with each other. Furthermore, in the present disclosure, terms meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. are not limited to the original degree, comparative degree and superlative degree, but may also be rephrased with each other. Furthermore, in the present disclosure, terms meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. as expressions with "i" (i is an arbitrary integer) may also be rephrased with each other (for example, "highest" may also be rephrased with "i-th highest").

[0687] In the present disclosure, “of,” “for,” “regarding,” “related to,” “associated with,” etc. may be rephrased.

[0688] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: A receiving unit receives first downlink control information (i.e., first DCI) for scheduling a signal corresponding to a transmission opportunity of a hybrid automatic repeat request acknowledgment HARQ-ACK, and a second DCI for a beam indication corresponding to the transmission opportunity; and a control unit that determines a first TCI state applied to the signal based on a first transmission configuration indication field, i.e., a first TCI field, included in the first DCI, and determines a second TCI state to be applied after a specific period has passed since the last codeword of the transmission opportunity based on a second TCI field included in the second DCI, Each of the first TCI state and the second TCI state is a TCI state applied to both a downlink DL signal and an uplink UL signal, or a TCI state applied to a DL signal and a TCI state applied to a UL signal.

2. The terminal according to claim 1, wherein: The control unit applies any one of a plurality of TCI states for a plurality of signals that have already been applied as the first TCI state to the channel based on the first TCI field.

3. The terminal according to claim 1, wherein: The control unit applies any one of a plurality of TCI states set using higher layer signaling as the first TCI state to the channel based on the first TCI field.

4. The terminal according to claim 1, wherein: The receiving unit further receives a third DCI for scheduling a signal different from the signal after the specific period has passed, wherein the third DCI includes a field related to an indication of a set of TCI states, The control unit further determines a third TCI state applied to the different signal based on the second DCI and the third DCI.

5. A wireless communication method of a terminal, comprising: The step of receiving first downlink control information (i.e., first DCI) for scheduling a signal corresponding to a transmission opportunity of a hybrid automatic repeat request confirmation HARQ-ACK, and a second DCI for a beam indication corresponding to the transmission opportunity; and The step of determining a first TCI state applied to the signal based on a first transmission configuration indication field, i.e., a first TCI field, included in the first DCI, and determining a second TCI state to be applied after a specific period has passed since the last codeword of the transmission opportunity based on a second TCI field included in the second DCI, Each of the first TCI state and the second TCI state is a TCI state applied to both a downlink DL signal and an uplink UL signal, or a TCI state applied to a DL signal and a TCI state applied to a UL signal.

6. A base station, comprising: A transmitting unit, transmitting first downlink control information (i.e., first DCI) for scheduling a signal corresponding to a transmission opportunity of a hybrid automatic repeat request acknowledgment HARQ-ACK, and a second DCI for a beam indication corresponding to the transmission opportunity; and a control unit that indicates a first TCI state applied to the signal using a first transmission configuration indication field, i.e., a first TCI field, included in the first DCI, and indicates a second TCI state applied after a specific period has passed since the last symbol of the transmission opportunity using a second TCI field included in the second DCI, Each of the first TCI state and the second TCI state is a TCI state applied to both a downlink DL signal and an uplink UL signal, or a TCI state applied to a DL signal and a TCI state applied to a UL signal.

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