Terminal, wireless communication method, base station and system

Abstract

A terminal according to one embodiment of the present disclosure is characterized by including a receiving unit for receiving first downlink control information (DCI) for scheduling a signal that corresponds to a transmission opportunity of hybrid automatic repeat request acknowledgement (HARQ-ACK), and a second DCI for a beam indication that corresponds to the transmission opportunity; and a control unit for determining, on the basis of a first transmission configuration indicator (TCI) field that is included in the first DCI, a first TCI state to be applied to the signal, and determining, on the basis of a second TCI field included in the second DCI, a second TCI state the application of which is begun after the elapse of a specific period from the last symbol of the transmission opportunity, each of the first and second TCI states being either a TCI state to be applied to both a downlink (DL) signal and an uplink (UL) signal, or one of a TCI state to be applied to the DL signal and a TCI state to be applied to the UL signal. The one embodiment of the present disclosure makes it possible to suitably carry out a TCI state instruction.

Description

Terminal, wireless communication method and base station

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

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

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

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

[0005] In future wireless communication systems (e.g., NR), it is being considered that user terminals (terminals, user terminals, User Equipment (UE)) will control transmission and reception processing based on information regarding quasi-co-location (QCL) (QCL assumptions / Transmission Configuration Indication (TCI) state / spatial relationship).

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

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

[0008] A terminal according to one aspect of the present disclosure includes: a receiving unit that receives first downlink control information (DCI) that schedules a signal corresponding to a transmission opportunity for a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) and a second DCI for a beam instruction corresponding to the transmission opportunity; and a control unit that determines a first transmission configuration indication (TCI) state to apply to the signal based on a first transmission configuration indication (TCI) field included in the first DCI, and determines a second TCI state that begins to be applied after a specific period has elapsed from the final symbol 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 that is applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state that is applied to a DL signal and a TCI state that is applied to a UL signal.

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

[0010] Figures 1A and 1B illustrate an example of communication between a mobile station and a transmission point (e.g., remote radio head). Figures 2A to 2C illustrate an example of Schemes 0 to 2 for SFN. Figures 3A and 3B illustrate an example of Scheme 1. Figures 4A to 4C illustrate an example of a Doppler pre-compensation scheme. Figure 5 illustrates an example of simultaneous beam updating across multiple CCs. Figures 6A and 6B illustrate an example of common beams. Figure 7 illustrates an example of BAT defined in Rel. 17. Figure 8 illustrates an example of TCI state application when receiving multiple beam indication DCIs. Figures 9A and 9B illustrate an example of single DCI-based multi-TRP transmission and multiple DCI-based multi-TRP transmission, respectively. Figures 10A and 10B illustrate an example of the TCI field in DCI. Figures 11A and 11B illustrate an example of setting / indicating joint TCI states for single DCI-based multi-TRP. 12A and 12B are diagrams illustrating an example of setting / indicating separate TCI states in a single-DCI-based multi-TRP. FIGS. 13A and 13B are diagrams illustrating an example of setting / indicating a joint TCI state corresponding to a first value of a CORESET pool index in a multi-DCI-based multi-TRP. FIGS. 14A and 14B are diagrams illustrating an example of setting / indicating a joint TCI state corresponding to a second value of a CORESET pool index in a multi-DCI-based multi-TRP. FIGS. 15A to 15D are diagrams illustrating an example of TCI state indication according to Option 1-A / 1-B. FIG. 16 is a diagram illustrating an example of TCI state application according to the first embodiment. FIG. 17 is a diagram illustrating an example of TCI state indication according to a modification of the first embodiment. FIG. 18 is a diagram illustrating another example of TCI state indication according to a modification of the first embodiment. FIG. 19 is a diagram illustrating another example of TCI state indication according to a modification of the first embodiment. FIG. 20 is a diagram illustrating an example of a DCI field according to the second embodiment. 21A to 21D are diagrams illustrating an example of switching between single-TRP and multi-TRP according to the second embodiment. FIG. 22 is a diagram illustrating an example of dynamic switching of DCI size according to the second embodiment.FIG. 23 is a diagram showing an example of switching between single and multi-TRP modes according to the second embodiment. FIG. 24 is a diagram showing another example of switching between single and multi-TRP modes according to the second embodiment. FIG. 25 is a diagram showing another example of switching between single and multi-TRP modes according to the second embodiment. FIG. 26 is a diagram showing another example of switching between single and multi-TRP modes according to Option 2-2. FIG. 27 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 28 is a diagram showing an example of a configuration of a base station according to an embodiment. FIG. 29 is a diagram showing an example of a configuration of a user terminal according to an embodiment. FIG. 30 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. FIG. 31 is a diagram showing an example of a vehicle according to an embodiment.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0025] For the PDCCH and PDSCH, the QCL Type A RS is always configured, and the QCL Type D RS may be configured additionally. Since it is difficult to estimate Doppler shift, delay, etc. by one-shot reception of the DMRS, the QCL Type A RS is used to improve the accuracy of channel estimation. The QCL Type D RS is used to determine the receiving beam when receiving the DMRS.

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

[0027] (Default TCI State / Default Spatial Relationship / Default PL-RS) In Rel. 16, PDSCH may be scheduled with a DCI having a TCI field. The TCI state for the PDSCH is indicated by the TCI field. The TCI field of DCI format 1-1 is 3 bits, and the TCI field of DCI format 1-2 is a maximum of 3 bits.

[0028] In RRC connected mode, if the first TCI information element in DCI (higher layer parameter tci-PresentInDCI) is set to "enabled" for a CORESET scheduling a PDSCH, the UE assumes that the TCI field is present in DCI format 1_1 of the PDCCH transmitted in this CORESET.

[0029] Furthermore, if the TCI information element in the second DCI (higher layer parameter tci-PresentInDCI-1-2) for the CORESET scheduling the PDSCH is configured in the UE, the UE assumes that a TCI field with the DCI field size indicated in the TCI information element in the second DCI is present in DCI format 1_2 of the PDSCH transmitted in the CORESET.

[0030] Also, in Rel. 16, PDSCH may be scheduled by DCI without a TCI field. The DCI format of this DCI may be DCI format 1_0 or DCI format 1_1 / 1_2 in the case where the TCI information element in the DCI (the higher layer parameter tci-PresentInDCI or tci-PresentInDCI-1-2) is not configured (enabled). When PDSCH is scheduled by DCI without a TCI field, if the time offset between the reception of the DL DCI (the DCI that schedules the PDSCH (scheduling DCI)) and the corresponding PDSCH (the PDSCH scheduled by this DCI) is equal to or greater than a threshold (timeDurationForQCL), the UE assumes that the TCI state or QCL assumption for the PDSCH is the same as the TCI state or QCL assumption (default TCI state) of CORESET (e.g., the scheduling DCI).

[0031] In RRC connected mode, both when the TCI information element in DCI (higher layer parameters tci-PresentInDCI and tci-PresentInDCI-1-2) is set to "enabled" and when the TCI information element in DCI is not set, if the time offset between the reception of a DL DCI (a DCI scheduling a PDSCH) and the corresponding PDSCH (the PDSCH scheduled by that DCI) is less than a threshold (timeDurationForQCL) (applicability condition, first condition), in the case of non-cross-carrier scheduling, the TCI state of the PDSCH (default TCI state) may be the TCI state of the lowest CORESET ID in the latest slot in the active DL BWP of that CC (for a particular UL signal). Otherwise, the TCI state of the PDSCH (default TCI state) may be the TCI state of the lowest TCI state ID of the PDSCH in the active DL BWP of the scheduled CC.

[0032] In Rel. 15, separate MAC CEs are required for the activation / deactivation of the PUCCH spatial relation and for the activation / deactivation of the SRS spatial relation. The PUSCH spatial relation follows the SRS spatial relation.

[0033] 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.

[0034] If neither the spatial relationship nor the PL-RS for the PUCCH is configured in FR2 (applicable condition, second condition), default assumptions of the spatial relationship and the PL-RS for the PUCCH (default spatial relationship and default PL-RS) are applied. If neither the spatial relationship nor the PL-RS for the SRS (SRS resource for the SRS or SRS resource corresponding to the SRI in DCI format 0_1 ​​that schedules the PUSCH) is configured in FR2 (applicable condition, second condition), default assumptions of the spatial relationship and the PL-RS for the PUSCH and SRS scheduled by DCI format 0_1 ​​(default spatial relationship and default PL-RS) are applied.

[0035] If a CORESET is configured in the active DL BWP on that CC (if applicable), the default spatial relationship and default PL-RS may be the TCI state or QCL assumption of the CORESET with the lowest CORESET ID in that active DL BWP. If a CORESET is not configured in the active DL BWP on that CC, the default spatial relationship and default PL-RS may be the active TCI state with the lowest PDSCH ID in that active DL BWP.

[0036] In Rel. 15, the spatial relationship of the PUCCH scheduled by DCI format 0_0 follows the spatial relationship of the PUCCH resource with the lowest PUCCH resource ID among the active spatial relationships of the PUCCHs on the same CC. The network needs to update the PUCCH spatial relationship on all SCells, even if no PUCCH is transmitted on the SCell.

[0037] In Rel. 16, PUCCH configuration is not required for a PUSCH scheduled by DCI format 0_0. If there is no active PUCCH spatial relationship or no PUCCH resource on the active UL BWP in the CC for a PUSCH scheduled by DCI format 0_0 (applicable condition, second condition), the default spatial relationship and default PL-RS are applied to the PUSCH.

[0038] The application conditions for the default spatial relationship / default PL-RS for SRS may include a default beam path loss enable information element for SRS (upper layer parameter enableDefaultBeamPlForSRS) being set to valid. The application conditions for the default spatial relationship / default PL-RS for PUCCH may include a default beam path loss enable information element for PUCCH (upper layer parameter enableDefaultBeamPlForPUCCH) being set to valid. The application conditions for the default spatial relationship / default PL-RS for PUSCH scheduled by DCI format 0_0 may include a default beam path loss enable information element for PUSCH scheduled by DCI format 0_0 (upper layer parameter enableDefaultBeamPlForPUSCH0_0) being set to valid.

[0039] In Rel. 16, if an RRC parameter (a parameter enabling a default beam PL for PUCCH (enableDefaultBeamPL-ForPUCCH), a parameter enabling a default beam PL for PUSCH (enableDefaultBeamPL-ForPUSCH0_0), or a parameter enabling a default beam PL for SRS (enableDefaultBeamPL-ForSRS)) is configured for a UE and a spatial relationship or PL-RS is not configured, the UE applies the default spatial relationship / PL-RS.

[0040] This threshold may also be called time duration for QCL, "timeDurationForQCL", "Threshold", "Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset", "beamSwitchTiming", schedule offset threshold, scheduling offset threshold, etc. This threshold may be reported by the UE as UE capability (per subcarrier spacing).

[0041] If the offset (scheduling offset) between the reception of a DL DCI and the corresponding PDSCH is smaller than a threshold timeDurationForQCL, and at least one TCI state configured for the serving cell of the scheduled PDSCH includes "QCL type D", and the UE configures the two default TCI enable information element (enableTwoDefaultTCIStates-r16), and at least one TCI codepoint (the codepoint of the TCI field in the DL DCI) indicates two TCI states, the UE assumes that the PDSCH or the DMRS port of the PDSCH transmission occasion of the serving cell is quasi-colocated with the RS for the QCL parameters associated with the two TCI states corresponding to the lowest codepoints among the TCI codepoints containing two different TCI states (two-default QCL assumption decision rule). The 2 default TCI enable information element indicates that Rel. 16 operation of the 2 default TCI states for the PDSCH is enabled when at least one TCI codepoint is mapped to 2 TCI states.

[0042] As the default TCI state for PDSCH in Rel. 15 / 16, the default TCI state for single TRP, the default TCI state for multi-TRP based on multi-DCI, and the default TCI state for multi-TRP based on single DCI are specified.

[0043] As default TCI states for aperiodic CSI-RS (A (aperiodic)-CSI-RS) in Rel. 15 / 16, the default TCI state for single TRP, the default TCI state for multi-TRP based on multi-DCI, and the default TCI state for multi-TRP based on single DCI are specified.

[0044] In Rel. 15 / 16, the default spatial relationship and default PL-RS for each of PUSCH / PUCCH / SRS are specified.

[0045] (Multi-TRP) In NR, one or more transmission / reception points (TRP) (multi-TRP (MTRP)) are considered to perform DL transmission to a UE using one or more panels (multi-panels). Also, it is considered that a UE performs UL transmission to one or more TRPs using one or more panels.

[0046] Note that multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0047] Multi-TRPs (e.g., TRPs #1 and #2) may be connected by ideal / non-ideal backhauls to exchange information, data, etc. Each TRP of a multi-TRP may transmit a different code word (CW) and a different layer. Non-Coherent Joint Transmission (NCJT) may be used as a form of multi-TRP transmission.

[0048] In the NCJT, for example, TRP#1 modulates and layer-maps a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding, and TRP#2 modulates and layer-maps a second codeword to transmit a second PDSCH using a second number of layers (e.g., two layers) with a second precoding.

[0049] Note that multiple PDSCHs (multi-PDSCHs) that are non-coherent may be defined as partially or completely overlapping in time and / or frequency domains, i.e., a first PDSCH from a first TRP and a second PDSCH from a second TRP may overlap in time and / or frequency resources.

[0050] The first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (QCL). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0051] Multiple PDSCHs from multiple TRPs (which may be referred to as multiple PDSCHs) may be scheduled using one DCI (single DCI, single PDCCH) (single-master mode, single-DCI based multi-TRP). Multiple PDSCHs from multiple TRPs may be scheduled using multiple DCIs (multiple DCI, multiple PDCCHs) (multi-master mode, multi-DCI based multi-TRP).

[0052] In URLLC for multi-TRP, it is considered that PDSCH (transport block (TB) or codeword (CW)) repetition across multi-TRP is supported. Repetition schemes (URLLC schemes, e.g., Schemes 1, 2a, 2b, 3, and 4) across multi-TRP in the frequency domain, layer (spatial) domain, or time domain are supported. In Scheme 1, multiple PDSCHs from multi-TRP are space division multiplexed (SDM). In Schemes 2a and 2b, PDSCHs from multi-TRP are frequency division multiplexed (FDM). In Scheme 2a, the redundancy version (RV) is the same for multi-TRP. In Scheme 2b, the RVs for multi-TRP may be the same or different. In schemes 3 and 4, multiple PDSCHs from multiple TRPs are time division multiplexed (TDM). In scheme 3, multiple PDSCHs from multiple TRPs are transmitted in one slot. In scheme 4, multiple PDSCHs from multiple TRPs are transmitted in different slots.

[0053] Such a multi-TRP scenario allows for more flexible transmission control using good quality channels.

[0054] In order to support multi-TRP transmission within a cell (with the same cell ID) and between cells (with different cell IDs) based on multiple PDCCHs, in the RRC configuration information for linking multiple pairs of PDCCHs and PDSCHs with multiple TRPs, one control resource set (CORESET) in the PDCCH configuration information (PDCCH-Config) may correspond to one TRP.

[0055] If at least one of the following conditions 1 and 2 is satisfied, the UE may determine that the transmission is a multi-TRP transmission based on the multi-DCI. In this case, the TRP may be replaced with the CORESET pool index. [Condition 1] A CORESET pool index of 1 is set. [Condition 2] Two different values ​​of the CORESET pool index (e.g., 0 and 1) are set.

[0056] If the following condition is met, the UE may determine that it is a multi-TRP based on a single DCI. In this case, two TRPs may be interpreted as two TCI states indicated by the MAC CE / DCI. [Condition] "Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE" is used to indicate one or two TCI states for one codepoint in the TCI field in the DCI.

[0057] The DCI for common beam instruction may be a UE-specific DCI format (e.g., DL DCI format (e.g., 1_1, 1_2), UL DCI format (e.g., 0_1, 0_2)), or may be a UE-group common DCI format.

[0058] (Multi-TRP PDCCH) For the reliability of a multi-TRP PDCCH based on a non-single frequency network (SFN), the following considerations 1 to 3 are considered: [Consideration 1] Coding / rate matching is based on one repetition, and the same coded bits are repeated in other repetitions. [Consideration 2] Each repetition has the same number of control channel elements (CCEs), the same coded bits, and corresponds to the same DCI payload. [Consideration 3] Two or more PDCCH candidates are explicitly linked to each other. The UE knows the link before decoding.

[0059] The following options for PDCCH repetition are considered: 1-2, 1-3, 2, 3.

[0060] [Option 1-2] Two sets of PDCCH candidates (within a given search space (SS) set) are associated with two TCI states of the CORESET, respectively, where the same CORESET, the same SS set, and PDCCH repetitions on different monitoring occasions are used.

[0061] [Options 1-3] Two sets of PDCCH candidates are associated with two SS sets, respectively. Both SS sets are associated with a CORESET, and each SS set is associated with only one TCI state of that CORESET. Here, the same CORESET and two SS sets are used.

[0062] [Option 2] One SS set is associated with two different CORESETs.

[0063] [Option 3] Two SS sets are associated with two CORESETs, respectively.

[0064] In this way, it is considered that two PDCCH candidates in two SS sets for PDCCH repetition are supported and the two SS sets are explicitly linked.

[0065] (SFN PDCCH) For PDCCH / CORESET specified in Rel. 15, one TCI state without CORESETPoolIndex (also referred to as TRP Info) is set to one CORESET.

[0066] Regarding the PDCCH / CORESET enhancements specified in Rel. 16, in multi-TRP based on multi-DCI, a CORESET pool index is configured for each CORESET.

[0067] In Rel. 17 and later, the following enhancements 1 and 2 regarding PDCCH / CORESET are being considered.

[0068] In the case where multiple antennas (small antennas, transmission / reception points) having the same cell ID form a single frequency network (SFN), up to two TCI states can be set / activated for one CORESET by higher layer signaling (RRC signaling / MAC CE) (Enhancement 1). SFN contributes to at least one of the operation and reliability improvement of HST (high speed train).

[0069] Furthermore, in repeated transmission of PDCCH (which may simply be referred to as "repetition"), two PDCCH candidates in two search space sets are linked, and each search space set is associated with a corresponding CORESET (Enhancement 2). The two search space sets may be associated with the same or different CORESETs. For one CORESET, one (maximum one) TCI state can be configured / activated by higher layer signaling (RRC signaling / MAC CE).

[0070] If two search space sets are associated with different CORESETs with different TCI states, this may mean a multi-TRP repeat transmission. If two search space sets are associated with the same CORESET (CORESET with the same TCI state), this may mean a single-TRP repeat transmission.

[0071] (HST) In LTE, placement of HST (high-speed train) in tunnels is difficult. Large antennas transmit both inside and outside the tunnel. For example, the transmission power of a large antenna is approximately 1 to 5 W. For handover purposes, it is important for the UE to transmit outside the tunnel before entering it. For example, the transmission power of a small antenna is approximately 250 mW. Multiple small antennas (transmitting and receiving points) with the same cell ID and a distance of 300 m form a single frequency network (SFN). All small antennas within the SFN transmit the same signal at the same time on the same PRB. It is assumed that a terminal transmits and receives signals to a single base station. In reality, multiple transmitting and receiving points transmit the same DL signal. When moving at high speed, transmitting and receiving points of several kilometers apart form a single cell. Handover occurs when crossing cells. This reduces the frequency of handovers.

[0072] In NR, it is assumed that a beam transmitted from a transmission point (e.g., RRH) is used to communicate with a terminal (hereinafter also referred to as a UE) included in a moving object (high speed train (HST)) such as a train moving at high speed. Existing systems (e.g., Rel. 15) support transmitting a unidirectional beam from an RRH to communicate with a moving object (see FIG. 1A).

[0073] 1A illustrates a case in which RRHs are installed along the moving path (or moving direction, traveling direction, or travel path) of a moving object, and a beam is formed from each RRH in the moving direction of the moving object. An RRH that forms a beam in one direction may be called a unidirectional RRH. In the example illustrated in FIG. 1A, the moving object receives a negative Doppler shift (−fD) from each RRH.

[0074] Here, we show a case where a beam is formed in the direction of travel of the moving body, but this is not limited to this, and a beam may be formed in the opposite direction to the direction of travel, or a beam may be formed in any direction regardless of the direction of travel of the moving body.

[0075] In Rel. 16 and later, it is assumed that multiple (e.g., two or more) beams are transmitted from the remote radio head (RRH). For example, it is assumed that beams are formed in both the moving direction of the mobile station and the opposite direction (see FIG. 1B).

[0076] 1B shows a case where RRHs are installed along the movement path of the moving object, and each RRH forms a beam in both the moving direction of the moving object and the opposite direction of the moving direction. An RRH that forms beams in multiple directions (e.g., two directions) may be called a bi-directional RRH.

[0077] In this HST, the UE communicates as if it were a single TRP. In base station implementations, it is possible to transmit from multiple TRPs (same cell ID).

[0078] 1B, when two remote radio heads (RRH#1 and RRH#2) use SFN, the mobile station switches from a signal with a negative Doppler shift to a signal with a positive Doppler shift, which increases power, midway between the two remote radio heads. In this case, the maximum Doppler shift change range that requires correction is from −fD to +fD, which is twice as large as that in the case of unidirectional remote radio heads.

[0079] In the present disclosure, a positive Doppler shift may be interpreted as information about a positive Doppler shift, a Doppler shift in the positive (positive) direction, or Doppler information in the positive (positive) direction, and a negative Doppler shift may be interpreted as information about a negative Doppler shift, a Doppler shift in the negative (negative) direction, or Doppler information in the negative (negative) direction.

[0080] Here, as HST schemes, the following schemes 0 to 2 (HST scheme 0 to HST scheme 2) will be compared.

[0081] In scheme 0 of FIG. 2A, a tracking reference signal (TRS), a DMRS, and a PDSCH are transmitted in common (using the same time and frequency resources) to two TRPs (RRHs) (normal SFN, transparent SFN, HST-SFN).

[0082] In scheme 0, the UE receives DL channels / signals equivalent to a single TRP, so there is one TCI state for the PDSCH.

[0083] In addition, Rel. 16 specifies an RRC parameter for distinguishing between transmissions using a single TRP and transmissions using an SFN. When a UE reports corresponding UE capability information, the UE may distinguish between reception of a DL channel / signal using a single TRP and reception of a PDSCH assuming an SFN based on the RRC parameter. On the other hand, the UE may also perform transmission and reception using an SFN assuming a single TRP.

[0084] In Scheme 1 of Figure 2B, TRSs are transmitted TRP-specifically (using different time / frequency resources depending on the TRP). In this example, TRS1 is transmitted from TRP#1 and TRS2 is transmitted from TRP#2.

[0085] In Scheme 1, there are two TCI states for the PDSCH since the UE receives DL channels / signals from each TRP using TRS from each TRP.

[0086] In Scheme 2 of FIG. 2C, TRS and DMRS are transmitted individually for each TRP. In this example, TRS1 and DMRS1 are transmitted from TRP#1, and TRS2 and DMRS2 are transmitted from TRP#2. Compared to Scheme 0, Schemes 1 and 2 can suppress sudden changes in Doppler shift and appropriately estimate / compensate for Doppler shift. Because the DMRS in Scheme 2 is increased more than that in Scheme 1, the maximum throughput of Scheme 2 is lower than that of Scheme 1.

[0087] In Scheme 0, the UE switches between single TRP and SFN based on higher layer signaling (RRC information element / MAC CE).

[0088] The UE may switch between Scheme 1 / Scheme 2 / NW pre-compensation schemes based on higher layer signaling (RRC information elements / MAC CE).

[0089] In Scheme 1, two TRS resources are set for the HST's forward direction and its reverse direction, respectively.

[0090] In the example of Figure 3A, the TRPs (TRPs #0, #2, ...) transmitting DL signals in the direction opposite to the HST transmit a first TRS (a TRS arriving before the HST) in the same time and frequency resource (SFN). The TRPs (TRPs #1, #3, ...) transmitting DL signals in the direction of travel of the HST transmit a second TRS (a TRS arriving after the HST) in the same time and frequency resource (SFN). The first TRS and the second TRS may be transmitted / received using different frequency resources.

[0091] In the example of FIG. 3B, TRS1-1 to 1-4 are transmitted as the first TRS, and TRS2-1 to 2-4 are transmitted as the second TRS.

[0092] Considering beam operation, the first TRS is transmitted using 64 beams and 64 time resources, and the second TRS is transmitted using 64 beams and 64 time resources. The beams of the first TRS and the beams of the second TRS are considered to be equal (the QCL Type D RSs are equal). By multiplexing the first TRS and the second TRS into the same time resource but different frequency resource, resource utilization efficiency can be improved.

[0093] In the example of Fig. 4A, RRHs #0-#7 are arranged along the movement path of the HST. RRHs #0-#3 and RRHs #4-#7 are connected to baseband units (BBU) #0 and #1, respectively. Each RRH is a bidirectional RRH, and forms beams in both the direction of travel of the movement path and the opposite direction using each transmission / reception point (TRP).

[0094] In the received signal of the example of Figure 4B (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 or equal to 0), a negative Doppler shift (-fD in this example) occurs. Also, when the UE receives a signal / channel (a beam in the direction opposite to 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 or equal to 0), a positive Doppler shift (+fD in this example) occurs.

[0095] In Rel. 17 and later, a Doppler pre-compensation scheme (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) is being considered for a base station to use when transmitting a downlink (DL) signal / channel from a TRP to a UE in an HST. By performing Doppler compensation in advance when transmitting a DL signal / channel to a UE, the TRP can reduce the effect of Doppler shift when the UE receives the DL signal / channel. In the present disclosure, the Doppler pre-compensation scheme may be a combination of Scheme 1 and Doppler shift pre-compensation by the base station.

[0096] In the Doppler pre-compensation scheme, it is being considered that the TRS from each TRP is transmitted without Doppler pre-compensation, and the PDSCH from each TRP is transmitted with Doppler pre-compensation.

[0097] In the Doppler pre-compensation scheme, the TRPs that form beams in the direction of travel and the TRPs that form beams in the opposite direction of travel perform Doppler compensation before transmitting DL signals / channels to UEs within the HST. In this example, TRP #2n-1 performs positive Doppler compensation, and TRP #2n performs negative Doppler compensation to reduce the effect of Doppler shift when the UE receives the signal / channel (Figure 4C).

[0098] Note that in the situation of Figure 4C, there may be two TCI states for the PDSCH, since the UE receives DL channels / signals from each TRP using TRS from each TRP.

[0099] Furthermore, in Rel. 17 and later, dynamic switching between single-TRP and SFN using the TCI field (TCI state field) is being considered. For example, one or two TCI states are configured / indicated at each TCI code point (TCI field code point, DCI code point) using an RRC information element / MAC CE (e.g., Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE) / DCI (TCI field). A UE may determine to receive a single-TRP PDSCH when one TCI state is configured / indicated. Alternatively, a UE may determine to receive a multi-TRP SFN PDSCH when two TCI states are configured / indicated.

[0100] (Simultaneous Beam Update of Multiple CCs) In Rel. 16, one MAC CE can update the beam index (TCI state) of multiple CCs.

[0101] The UE can be configured with up to two applicable CC lists (e.g., applicable-CC-list) by RRC. When two applicable CC lists are configured, the two applicable CC lists may correspond to in-band CA in FR1 and in-band CA in FR2, respectively.

[0102] The PDCCH TCI state activation MAC CE activates the TCI states associated with the same CORESET ID on all BWP / CCs in the applicable CC list.

[0103] Activation of TCI State for PDSCH The MAC CE activates the TCI state on all BWP / CCs in the applicable CC list.

[0104] A-SRS / SP-SRS Spatial Relationship Activation The MAC CE activates the spatial relationships associated with the same SRS resource ID on all BWPs / CCs in the applicable CC list.

[0105] In the example of Figure 5, the UE is configured with an applicable CC list indicating CCs #0, #1, #2, and #3, and a list indicating 64 TCI states for CORESET or PDSCH of each CC. If one TCI state of CC #0 is activated by a MAC CE, the corresponding TCI state is activated in CCs #1, #2, and #3.

[0106] Such simultaneous beam updating is considered applicable only to the single TRP case.

[0107] For PDSCH, the UE may follow the procedure A. [Procedure A] The UE receives an activation command to map up to eight TCI states to codepoints of the DCI field (TCI field) within one CC / DL BWP or within one set of CCs / BWPs. If one set of TCI state IDs is activated for one set of CCs / DL BWPs, then the applicable list of CCs is determined by the CC indicated in the activation command, and the same set of TCI states applies to all DL BWPs within the indicated CCs. Only if the UE is not provided with different values ​​of the CORESETPoolIndex in the CORESET information element (ControlResourceSet) and is not provided with at least one TCI codepoint that maps to two TCI states, can one set of TCI state IDs be activated for one set of CC / DL BWPs.

[0108] For PDCCH, the UE may follow procedure B. [Procedure B] If the UE is provided with up to two lists of cells for simultaneous TCI state activation by the simultaneous TCI cell list (simultaneousTCI-CellList) via the simultaneous TCI update list (at least one of simultaneousTCI-UpdateList-r16 and simultaneousTCI-UpdateListSecond-r16), the UE shall apply antenna port quasi co-location (QCL) provided by TCI states with the same activated TCI state ID value to CORESET with index p in all configured DL BWPs of all configured cells in one list determined from the serving cell index provided by the MAC CE command. A simultaneous TCI cell list can be provided for simultaneous TCI state activation only if the UE is not provided with multiple different values ​​of the CORESETPoolIndex in the CORESET information element (ControlResourceSet) and is not provided with at least one TCI codepoint that maps to two TCI states.

[0109] For semi-persistent (SP) / aperiodic (AP)-SRS, the UE may follow procedure C. [Procedure C] When spatial relation information (spatialRelationInfo) for SP or AP-SRS resources configured by the SRS resource information element (higher layer parameter SRS-Resource) for one set of CCs / BWPs is activated / updated by MAC CE, where the applicable list of CCs is indicated by the simultaneous spatial update list (higher layer parameter simultaneousSpatial-UpdateList-r16 or simultaneousSpatial-UpdateListSecond-r16), the spatial relation information is applied to SP or AP-SRS resources with the same SRS resource ID in all BWPs within the indicated CC. The spatial relation information (spatialRelationInfo) for the SP or AP-SRS resources configured by the SRS resource information element (higher layer parameter SRS-Resource) for one set of CCs / BWPs is activated / updated by the MAC CE only if the UE is not provided with different values ​​of the CORESETPoolIndex in the CORESET information element (ControlResourceSet) and is not provided with at least one TCI codepoint that maps to two TCI states.

[0110] The simultaneous TCI cell list (simultaneousTCI-CellList) and the simultaneous TCI update list (at least one of simultaneousTCI-UpdateList1-r16 and simultaneousTCI-UpdateList2-r16) are lists of serving cells whose TCI relationships can be updated simultaneously using MAC CE. simultaneousTCI-UpdateList1-r16 and simultaneousTCI-UpdateList2-r16 do not include the same serving cell.

[0111] The simultaneous spatial update list (at least one of the upper layer parameters simultaneousSpatial-UpdatedList1-r16 and simultaneousSpatial-UpdatedList2-r16) is a list of serving cells whose spatial relationships can be updated simultaneously using MAC CE. simultaneousSpatial-UpdatedList1-r16 and simultaneousSpatial-UpdatedList2-r16 do not include the same serving cell.

[0112] Here, the simultaneous TCI update list and the simultaneous spatial update list are configured by the RRC, the CORESET pool index of the CORESET is configured by the RRC, and the TCI code point mapped to the TCI state is indicated by the MAC CE.

[0113] (Unified / Common TCI Framework) The unified TCI framework allows UL and DL channels to be controlled by a common framework. Instead of specifying TCI states or spatial relationships for each channel as in Rel. 15, the unified TCI framework may specify a common beam (common TCI state) and apply it to all UL and DL channels, or a common beam for UL may apply to all UL channels and a common beam for DL ​​may apply to all DL channels.

[0114] One common beam for both DL and UL, or one common beam for DL ​​and one common beam for UL (two common beams overall) are considered.

[0115] The UE may assume the same TCI state for UL and DL (joint TCI state, joint TCI pool, joint common TCI pool, joint TCI state set). The UE may assume different TCI states for UL and DL (separate TCI state, separate TCI pool, UL separate TCI pool and DL separate TCI pool, separate common TCI pool, UL common TCI pool and DL common TCI pool).

[0116] The default beams for UL and DL may be aligned via MAC CE based beam management (MAC CE level beam indication). The default TCI state of the PDSCH may be updated to align with the default UL beam (spatial relationship).

[0117] DCI-based beam management (DCI-level beam indication) may indicate a common beam / unified TCI state from the same TCI pool for both UL and DL (joint common TCI pool, joint TCI pool, set). X (>1) TCI states may be activated by the MAC CE. The UL / DL DCI may select one from the X active TCI states. The selected TCI state may apply to both UL and DL channels / RS.

[0118] The TCI pool (set) may be multiple TCI states configured by RRC parameters, or multiple TCI states (active TCI states, active TCI pools, sets) activated by MAC CE among the multiple TCI states configured by RRC parameters. Each TCI state may be a QCL type A / D RS. SSB, CSI-RS, or SRS may be configured as the QCL type A / D RS.

[0119] The number of TCI states corresponding to each of one or more TRPs may be specified. For example, the number N (≧1) of TCI states applied to UL channels / RSs (UL TCI states) and the number M (≧1) of TCI states applied to DL channels / RSs (DL TCI states) may be specified. At least one of N and M may be notified / configured / instructed to the UE via higher layer signaling / physical layer signaling.

[0120] In the present disclosure, when N=M=X (X is any integer), it may mean that X TCI states (joint TCI states) common to UL and DL (corresponding to X TRPs) are notified / configured / instructed to the UE.

[0121] Furthermore, when N=X (X is any integer) and M=Y (Y is any integer, Y may be X), it may mean that X UL TCI states (corresponding to X TRPs) and Y DL TCI states (corresponding to Y TRPs) are notified / configured / 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).

[0122] For example, when N=M=1 is written, this may mean that a TCI state common to one UL and DL for a single TRP is notified / configured / indicated to the UE (joint TCI state for a single TRP).

[0123] Also, for example, when N=1 and M=1 are written, this may mean that one UL TCI state and one DL TCI state for a single TRP are separately notified / configured / instructed to the UE (separate TCI states for a single TRP).

[0124] Also, for example, when N=M=2 is written, this may mean that a TCI state common to multiple (two) ULs and DLs for multiple (two) TRPs is notified / configured / instructed to the UE (joint TCI state for multiple TRPs).

[0125] Also, for example, when N=2 and M=2, it may mean that multiple (two) UL TCI states and multiple (two) DL TCI states for multiple (two) TRPs are notified / configured / instructed to the UE (separate TCI states for multiple TRPs).

[0126] Furthermore, for example, when N=2 and M=1, this may mean that two TCI states common to the UL and DL are notified / configured / instructed to the UE. In this case, the UE may use the two configured / instructed TCI states as UL TCI states and use one TCI state of the two configured / instructed TCI states as a DL TCI state.

[0127] Also, for example, when N=2 and M=1, this may mean that two UL TCI states and one DL TCI state are notified / configured / instructed to the UE as separate TCI states.

[0128] In the above example, the values ​​of N and M are 1 or 2, but the values ​​of N and M may be 3 or more, and N and M may be different.

[0129] The case where M>1 / N>1 may indicate at least one of TCI status indications for multiple TRPs and multiple TCI status indications for inter-band CA.

[0130] In the example of Figure 6A, the RRC parameters (information elements) configure multiple TCI states for both DL and UL. The MAC CE may activate multiple TCI states from the configured multiple TCI states. The DCI may indicate one of the activated multiple TCI states. The DCI may be a UL / DL DCI. The indicated TCI state may apply to at least one (or all) of the UL / DL channels / RS. One DCI may indicate both the UL TCI and the DL TCI.

[0131] In the example of FIG. 6A, a point may be one TCI state that applies to both UL and DL, or two TCI states that apply to UL and DL, respectively.

[0132] At least one of the multiple TCI states configured by the RRC parameters and the multiple TCI states activated by the MAC CE may be referred to as a TCI pool (common TCI pool, joint TCI pool, TCI state pool). The multiple TCI states activated by the MAC CE may be referred to as an active TCI pool (active common TCI pool).

[0133] In the present disclosure, higher layer parameters (RRC parameters) for setting multiple TCI states may be referred to as configuration information for setting multiple TCI states, or simply as "configuration information." Also, in the present disclosure, being instructed to set one of multiple TCI states using DCI may mean receiving indication information instructing one of the multiple TCI states included in DCI, or may simply mean receiving "instruction information."

[0134] In the example of Figure 6B, the RRC parameters configure multiple TCI states (joint common TCI pools) for both DL and UL. The MAC CE may activate multiple TCI states (active TCI pools) from the configured multiple TCI states. Separate active TCI pools for each of the UL and DL may be configured / activated.

[0135] The DL DCI or a new DCI format may select (indicate) one or more (e.g., one) TCI states. The selected TCI state may apply to one or more (or all) DL channels / RSs. The DL channels may be PDCCH / PDSCH / CSI-RS. The UE may determine the TCI state of each DL channel / RS using the TCI state behavior (TCI framework) of Rel. 16. The UL DCI or a new DCI format may select (indicate) one or more (e.g., one) TCI states. The selected TCI state may apply to one or more (or all) UL channels / RSs. The UL channels may be PUSCH / SRS / PUCCH. In this way, different DCIs may indicate UL TCI and DL DCI separately.

[0136] The existing DCI formats 1_1 / 1_2 may be used to indicate the common TCI state.

[0137] The DCI format indicating the TCI status may be a specific DCI format, for example, DCI format 1_1 / 1_2 (defined in Rel. 15 / 16 / 17).

[0138] The DCI format (DCI format 1_1 / 1_2) indicating the TCI state may be a DCI format without a DL assignment. In the present disclosure, the DCI format may be interchangeably referred to as a DCI format without a DL assignment, a DCI format (DCI format 1_1 / 1_2) that does not schedule a PDSCH, a DCI format (DCI format 1_1 / 1_2) that does not include one or more specific fields, or a DCI format (DCI format 1_1 / 1_2) in which one or more specific fields are set to fixed values.

[0139] For a DCI format without DL assignment (a DCI format that does not include one or more specific fields), the specific fields may be fields other than the TCI field, the DCI format identifier field, the carrier indicator field, the bandwidth portion (BWP) indicator field, the Time Domain Resource Assignment (TDRA) field, the Downlink Assignment Index (DAI) field (if configured), the Transmission Power Control (TPC) command field (for the scheduled PUCCH), the PUCCH resource indicator field, and the PDSCH-to-HARQ feedback timing indicator field (if present). The specific fields may be set as reserved fields or ignored.

[0140] For DCI formats without DL assignment (DCI formats in which one or more specific fields are set to fixed values), the specific fields may 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.

[0141] The RV field may be set to all ones. The MCS field may be set to all ones. The NDI field may be set to zero. The FDRA field of type 0 may be set to all zeros. The FDRA field of type 1 may be set to all ones. The FDRA field for dynamic switch (higher layer parameter dynamicSwitch) may be set to all zeros.

[0142] A common TCI framework may have separate TCI states for DL ​​and UL.

[0143] Beam Application Time (BAT) In the unified TCI state of Rel. 17, it is considered to introduce the time for beam application (beam application time (BAT)).

[0144] In the unified TCI state in Rel. 17, the DCI that schedules a PDSCH (scheduling DCI) does not indicate the TCI state of that PDSCH.

[0145] The scheduling DCI indicates the "indicated TCI state" of the DL / UL channels / RS that follow the DCI in time.

[0146] In the present disclosure, the terms "indicated TCI state," "Rel. 17 TCI state," "unified TCI state," "common TCI state," "joint (DL / UL) TCI state," "separate (DL / UL) TCI state," and "(simply) TCI state" may be read interchangeably.

[0147] In Rel. 17, it is considered that the indicated TCI state is applied (starts to be applied) in the next slot after a specific time (BAT) has elapsed since the transmission of the HARQ-ACK corresponding to (related to) the beam indication DCI (the last symbol of the PUSCH / PUCCH transmitting the HARQ-ACK).

[0148] Here, the beam instruction DCI may be a DCI that indicates a TCI state. The beam instruction DCI may be a DCI format with DL assignment and a DCI format without DL assignment.

[0149] Furthermore, the HARQ-ACK corresponding to the beam instruction DCI may mean the HARQ-ACK for the PDSCH scheduled by the beam instruction DCI, or may mean the HARQ-ACK for the beam instruction DCI.

[0150] The specific time (BAT) may be given by a specific parameter (e.g., BeamAppTime_r17), which may be configured in the UE by higher layer signaling (RRC signaling) or may be determined based on reported UE capability information.

[0151] The length of the BAT may be expressed in units of symbols, for example, 1, 2, 4, 7, 14, 28, 42, 56, 70, 84, 98, 112, 224, or 336 (each in units of symbols).

[0152] Fig. 7 is a diagram showing an example of a BAT defined in Rel. 17. In the example shown in Fig. 7, a UE receives a beam instruction DCI and is scheduled for a PDSCH by the DCI. The UE then transmits an acknowledgement (ACK, HARQ-ACK) for the PDSCH.

[0153] In the example shown in Figure 7, the UE starts applying the TCI state indicated in the beam instruction DCI after (the next slot after) the time given by BeamAppTime_r17 has elapsed from the transmission of the HARQ-ACK corresponding to the beam instruction DCI (the last symbol of the PUSCH / PUCCH that transmits the HARQ-ACK).

[0154] The UE may transmit HARQ-ACKs associated with one or more PDSCHs in one transmission opportunity.

[0155] When a UE transmits HARQ-ACKs related to multiple PDSCHs in one transmission opportunity, the TCI field of only one of the DCIs that schedule the multiple PDSCHs is valid (used as the TCI field for beam indication), and the TCI fields of the other DCIs are invalid (not used as the TCI field for beam indication).

[0156] The DCI for which the TCI field is valid may be any DCI among a plurality of DCIs.

[0157] 8 shows an example of application of TCI states when receiving multiple beam instruction DCIs. In FIG. 8, a UE receives DCI #1 scheduling PDSCH #1, DCI #2 scheduling PDSCH #2, DCI #3 scheduling PDSCH #3, and DCI #4 scheduling PDSCH #4. HARQ-ACKs for PDSCH #1-#4 are transmitted in the same transmission opportunity.

[0158] In the example shown in FIG. 8, DCIs #1-#3 indicate TCI state #1, and DCI #4 indicates TCI state #2.

[0159] The UE starts applying TCI state #2 indicated by DCI #4 (the next slot) after the BAT period has elapsed since the transmission of HARQ-ACK (the final symbol of PUSCH / PUCCH that transmits HARQ-ACK). At this time, the UE ignores the TCI states indicated by DCI #1-#3 (does not use them as TCI fields for beam indication).

[0160] In addition, Figure 8 shows an example in which the TCI state of the chronologically latest DCI among multiple DCIs is applied, but the DCI indicating the TCI state to be applied may be any of DCI #1-DCI #3.

[0161] (Analysis) The TCI state introduced in Rel. 17 (Rel. 17 TCI state, common TCI state) is considered to indicate one TCI state (M=1, N=1, or M=N=1). In other words, the Rel. 17 TCI state is considered to be applicable to situations using a single TRP.

[0162] It is being considered that the TCI states / spatial relationships defined up to Rel. 15 / 16 (excluding TCI states related to positioning reference signals) and the Rel. 17 TCI states will not be set in the same band.

[0163] In this case, features (e.g., operations using multiple TRPs) that use the Rel. 15 / 16 TCI state / spatial relationship defined in Rel. 15 through Rel. 17 cannot be configured in the same band as the Rel. 17 TCI state.

[0164] Therefore, there is a need to extend the common TCI states (Rel. 17 TCI states) to support features using Rel. 15 / 16 TCI state / spatial relationships, including multi-TRP schemes (e.g., using MAC CE / DCI to indicate more than one TCI state).

[0165] For example, in Rel. 18 and later, it is being considered to make the common TCI state applicable to at least one of the multi-TRP schemes specified in Rel. 16 / 17, such as: ・Single DCI-based NCJT PDSCH (Rel. 16) ・Multiple DCI-based NCJT PDSCH (Rel. 16) ・Single DCI-based SDM / TDM / FDM PDSCH repeat transmission (Rel. 16) ・Multiple TRP-based PDCCH / PUCCH / PUSCH repeat transmission (Rel. 17) ・Inter-cell operation for multi-TRP (Rel. 17) ・Beam management for multi-TRP (Rel. 17) ・HST / SFN (Rel. 17)

[0166] Furthermore, the extension of the common TCI state may be used for beam indication in inter-band carrier aggregation, in which one or more TCI states of different bands may be indicated using one MAC CE / DCI.

[0167] However, in the transmission and reception of signals / channels using multiple TRPs, the setting / indication / application of a common TCI state has not been sufficiently considered. More specifically, in the case of using a common TCI state, the application of a TCI state by a beam instruction DCI and the application of a TCI state by a scheduling / triggering DCI have not been sufficiently considered. Furthermore, the operation associated with switching between transmission and reception using a single TRP and transmission and reception using multiple TRPs has not been sufficiently considered. If these considerations are not sufficient, there is a risk of deterioration in communication quality, deterioration in throughput, etc.

[0168] Therefore, the inventors have come up with a method for appropriately setting / indicating / applying TCI states when transmitting and receiving signals / channels using multi-TRP, even when the TCI state is applied to multiple types of signals / channels.

[0169] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0170] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read as interchangeable. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as interchangeable. In the present disclosure, index, ID, indicator, and resource ID may be read as interchangeable. In the present disclosure, sequence, list, set, group, group, cluster, subset, etc. may be read as interchangeable. In the present disclosure, support, control, controllable, operate, and operable may be read as interchangeable.

[0171] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read interchangeably.

[0172] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, higher layer, higher layer parameters, RRC information elements (IEs), RRC messages, and settings may be read interchangeably.

[0173] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. In the present disclosure, the MAC CE, an update command, and an activation / deactivation command may be read interchangeably.

[0174] The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI, SIB1), Other System Information (OSI), etc.

[0175] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameter, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, RS of QCL type D for TCI state / QCL assumption, RS of QCL type A for TCI state / QCL assumption, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, and PL-RS may be read interchangeably. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS having QCL type X, source of DL-RS, SSB, CSI-RS, and SRS may be read interchangeably.

[0176] In the present disclosure, the terms panel, UE panel, panel group, antenna group, UE capability value, UE capability value set, specific (pool) index included in PUSCH configuration, specific (pool) index included in PUCCH configuration, specific (pool) index included in SRS configuration, beam, beam group, precoder, Uplink (UL) transmitting entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relation, SRS Resource Indicator (SRI), Control Resource Set (CONTROLLER RESEARCH SET ... Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relationship group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resource (e.g., reference signal resource, SRS resource), resource set (e.g., reference signal resource set), CORESET pool, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumption, etc.The UE capability value set may include, for example, the maximum number of supported SRS ports.

[0177] The panel may 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 group-based beam reporting.

[0178] Furthermore, the panel identifier (ID) and the panel may be interchangeable. That is, the TRP ID and the TRP, the CORESET group ID and the CORESET group, etc. may be interchangeable.

[0179] In the present disclosure, the terms TRP, transmission point, panel, DMRS port group, CORESET pool, and one of two TCI states associated with one code point in the TCI field may be read interchangeably.

[0180] In this disclosure, the terms "single TRP," "single TRP system," "single TRP transmission," and "single PDSCH" may be interchangeable. In this disclosure, the terms "multiple TRP," "multiple TRP system," "multiple TRP transmission," and "multiple PDSCH" may be interchangeable. In this disclosure, the terms "single DCI," "single PDCCH," "multiple TRP based on a single DCI," and "activating two TCI states on at least one TCI codepoint" may be interchangeable.

[0181] In the present disclosure, single TRP, channel using single TRP, channel using one TCI state / spatial relationship, multi-TRP not enabled by RRC / DCI, multiple TCI states / spatial relationships not enabled by RRC / DCI, a CORESETPoolIndex value of 1 not set for any CORESET, and no code point in the TCI field mapped to two TCI states may be read interchangeably.

[0182] In the present disclosure, "multi-TRP," "channel using multi-TRP," "channel using multiple TCI states / spatial relationships," "multi-TRP being enabled by RRC / DCI," "multiple TCI states / spatial relationships being enabled by RRC / DCI," and "at least one of multi-TRP based on a single DCI" and "multi-TRP based on multiple DCI" may be interchangeable. In the present disclosure, "multi-TRP based on multiple DCI," and "setting a CORESET pool index (CORESETPoolIndex) value of 1 for the CORESET" may be interchangeable. In the present disclosure, "multi-TRP based on a single DCI," and "at least one code point in the TCI field is mapped to two TCI states" may be interchangeable.

[0183] In the present disclosure, TRP #1 (first TRP) may correspond to CORESET pool index = 0 or may correspond to the first of two TCI states corresponding to one code point in the TCI field. TRP #2 (second TRP) TRP #1 (first TRP) may correspond to CORESET pool index = 1 or may correspond to the second of two TCI states corresponding to one code point in the TCI field.

[0184] In the present disclosure, single DCI (sDCI), single PDCCH, multi-TRP system based on single DCI, sDCI-based MTRP, and activation of two TCI states on at least one TCI codepoint may be read interchangeably.

[0185] In the present disclosure, multi-DCI (mDCI), multi-PDCCH, multi-TRP system based on multi-DCI, mDCI-based MTRP, and setting two CORESET pool indices or CORESET pool index = 1 (or a value greater than or equal to 1) may be read interchangeably.

[0186] The QCL in the present disclosure may be interchangeably read as QCL Type D.

[0187] In the present disclosure, expressions such as "TCI state A is of QCL type D, the same as TCI state B," "TCI state A is the same as TCI state B," and "TCI state A is of QCL type D with TCI state B" may be interpreted interchangeably.

[0188] 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 read interchangeably.

[0189] In the present disclosure, the terms "single TRP" and "SFN" may be interchangeable. In the present disclosure, the terms "HST," "HST scheme," "high speed mobility scheme," "scheme 1," "scheme 2," "NW pre-compensation scheme," "HST scheme 1," "HST scheme 2," and "HST NW pre-compensation scheme" may be interchangeable.

[0190] In the present disclosure, a PDSCH / PDCCH using a single TRP may be interpreted as a PDSCH / PDCCH based on a single TRP, or a single TRP PDSCH / PDCCH. Also, in the present disclosure, a PDSCH / PDCCH using an SFN may be interpreted as a PDSCH / PDCCH using an SFN in multi-mode, a PDSCH / PDCCH based on an SFN, or an SFN PDSCH / PDCCH.

[0191] In the present disclosure, receiving DL signals (PDSCH / PDCCH) using an SFN may mean receiving the same data (PDSCH) / control information (PDCCH) from multiple transmission / reception points using the same time / frequency resources. Also, receiving DL signals using an SFN may mean receiving the same data / control information using the same time / frequency resources and / or using multiple TCI states / spatial domain filters / beams / QCLs.

[0192] In the present disclosure, at least one of the following terms may be interchangeable: HST-SFN scheme, SFN scheme for Rel. 17 or later, new SFN scheme, new HST-SFN scheme, HST-SFN scenario for Rel. 17 or later, HST-SFN scheme for HST-SFN scenario, SFN scheme for HST-SFN scenario, scheme 1, HST-SFN scheme A / B, HST-SFN type A / B, Doppler pre-compensation scheme, scheme 1 (HST scheme 1), and Doppler pre-compensation scheme.

[0193] In the present disclosure, the terms 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, and HST-SFN type A / B may be interchangeable. In the present disclosure, the terms pre-compensation scheme, reduction scheme, improvement scheme, and correction scheme may be interchangeable.

[0194] In the present disclosure, a PDCCH / search space (SS) / CORESET with linkage, a linked PDCCH / SS / CORESET, and a PDCCH / SS / CORESET pair may be interchangeable. In the present disclosure, a PDCCH / SS / CORESET without linkage, an unlinked PDCCH / SS / CORESET, and a standalone PDCCH / SS / CORESET may be interchangeable.

[0195] In the present disclosure, two linked CORESETs for PDCCH repetition, two CORESETs respectively associated with two linked SS sets, may be read as interchangeable.

[0196] In the present disclosure, SFN-PDCCH repetition, PDCCH repetition, two linked PDCCHs, and one DCI being received across the two linked search spaces (SS) / CORESETs may be read interchangeably.

[0197] 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 read as interchangeable.

[0198] In the present disclosure, the terms PDCCH reception method, PDCCH repetition, SFN-PDCCH repetition, HST-SFN, and HST-SFN scheme may be read interchangeably.

[0199] In the present disclosure, the PDSCH reception method, single DCI-based multi-TRP, and HST-SFN scheme may be interchangeable.

[0200] In the present disclosure, the single DCI-based multi-TRP repetition may be an NCJT of an enhanced mobile broadband (eMBB) service (low priority, priority 0) or a repetition of a URLLC service (high priority, priority 1) of an ultra-reliable and low latency communications service.

[0201] In each embodiment of the present disclosure, a PDSCH for multiple TRPs based on a single DCI may be interchangeably read as a PDSCH to which TDM / FDM / SDM for multiple TRPs (as defined in Rel. 16) is applied.

[0202] In each embodiment of the present disclosure, the PDSCH for multiple TRPs may be interchangeably read as the PDSCH to which TDM / FDM / SDM for multiple TRPs based on a single DCI (specified in Rel. 16) is applied.

[0203] In each embodiment of the present disclosure, PUSCH / PUCCH / PDCCH for multiple TRPs based on a single DCI may be interchangeably read as repeated transmission (repetition) of PUSCH / PUCCH / PDCCH for multiple TRPs (defined in Rel. 17 and later).

[0204] In each embodiment of the present disclosure, the SFN PDSCH / PDCCH may be interchangeably read as the SFN PDSCH / PDCCH defined in Rel. 17 and later.

[0205] In each embodiment of the present disclosure, configuring the use of multiple TRPs based on multiple DCIs may mean setting a CORESET pool index of 1. Also, configuring the use of multiple TRPs based on multiple DCIs may mean setting two different CORESET pool index values ​​(e.g., 0 and 1).

[0206] In each embodiment of the present disclosure, UL transmission using multiple panels may refer to a UL transmission scheme using multiple panels of a UE with DCI enhancement.

[0207] The following embodiments of the present disclosure may be applied to transmission and reception of any channel / signal that is subject to the unified TCI state framework defined in the above-mentioned Rel. 17 and later.

[0208] In the present disclosure, applying a TCI state to each channel / signal / resource may mean applying the TCI state to transmission and reception of each channel / signal / resource.

[0209] In the present disclosure, small, few, short, and low may be read as interchangeable. Also, in the present disclosure, ignore, drop, cancel, discontinue, and postpone may be read as interchangeable.

[0210] In the present disclosure, repetition, repeated transmission, and repeated reception may be read interchangeably.

[0211] In the present disclosure, the terms channel, signal, and channel / signal may be interchangeable. In the present disclosure, the terms DL channel, DL signal, DL signal / channel, transmission / reception of DL signal / channel, DL reception, and DL transmission may be interchangeable. In the present disclosure, the terms UL channel, UL signal, UL signal / channel, transmission / reception of UL signal / channel, UL reception, and UL transmission may be interchangeable.

[0212] In the present disclosure, a first TRP may correspond to a first TCI state. In the present disclosure, a second TRP may correspond to a second TCI state. In the present disclosure, an n-th TRP may correspond to an n-th TCI state.

[0213] In the present disclosure, a first CORESET pool index value (e.g., 0), a first TRP index value (e.g., 1), and a first TCI state (first DL / UL (joint / separate) TCI state) may correspond to each other. In the present disclosure, a second CORESET pool index value (e.g., 1), a second TRP index value (e.g., 2), and a second TCI state (second DL / UL (joint / separate) TCI state) may correspond to each other.

[0214] In the following embodiments of the present disclosure, the application of multiple TCI states in transmission and reception using multiple TRPs will be mainly described with respect to a method for two TRPs (i.e., when at least one of N and M is 2), but the number of TRPs may be three or more (multiple), and each embodiment may be applied to correspond to the number of TRPs. In other words, at least one of N and M may be a number greater than 2.

[0215] (Wireless Communication Method) <Tenth Embodiment> Single DCI-based multi-TRP may be assumed to be supported when multi-TRP utilizes an ideal backhaul (see FIG. 9A).

[0216] In this case, one beam instruction DCI may indicate multiple TCI states for each TRP, which may be, for example, up to two joint TCI states or up to four separate DL / UL TCI states (two DL TCI states and two UL TCI states).

[0217] In the present disclosure, one TCI state may mean one joint (DL / UL) TCI state, or may mean at least one of one DL (separate) TCI state and one UL (separate) TCI state.

[0218] Multi-PDCCH (DCI) may be assumed to be supported when multi-TRPs utilize ideal / non-ideal backhaul (see FIG. 9B).

[0219] In this case, one DCI associated with one TRP (CORESET pool index) may indicate the TCI state corresponding to the TRP.

[0220] The ideal backhaul may be called DMRS port group type 1, reference signal related group type 1, antenna port group type 1, CORESET pool type 1, etc. The non-ideal backhaul may be called DMRS port group type 2, reference signal related group type 2, antenna port group type 2, CORESET pool type 2, etc. The names are not limited to these.

[0221] The field indicating the TCI status (TCI field) included in the DCI may follow at least one of the following options 0-1 and 0-2.

[0222] [Option 0-1] The TCI field defined up to Rel. 15 / 16 may be reused (see Figure 10A). As shown in Figure 10A, one TCI field may be included in the DCI. The number of bits in the TCI field may be a specific number (e.g., 3).

[0223] [Option 0-2] The TCI field defined up to Rel. 15 / 16 may be extended (see FIG. 10B). For example, the DCI may include multiple TCI fields (e.g., two). The number of bits in each TCI field may be a specific number (e.g., three).

[0224] In options 0-2, no DCI overhead is added for DCIs without DL assignments, while DCI overhead is added for DCIs with DL assignments.

[0225] For single DCI-based multi-TRP, in the case of joint TCI states, the DL / UL (joint) TCI state may be activated for the UE using MAC CE, and then the UE may be indicated the first DL / UL (joint) TCI state and the second DL / UL (joint) TCI state using DCI (beam indication) (see Figure 11A).

[0226] The TCI code point indicated by the beam indication may correspond to one or more (two) TCI states (first joint TCI state / second joint TCI state) (see FIG. 11B).

[0227] In the example shown in Figure 11B, all TCI code points corresponding to the active TCI state correspond to two TCI states, but an association may be used in which at least one TCI code point corresponding to the active TCI state corresponds to two TCI states. By using such an association, it is possible to dynamically switch between single TRP and multi-TRP.

[0228] For single DCI-based multi-TRP, in the case of separate TCI states, the DL (separate) TCI state and the UL (separate) TCI state may be activated for the UE using a MAC CE. The UE may then be indicated the first DL (separate) TCI state and the first UL (separate) TCI state and the second DL (separate) TCI state and the second UL (separate) TCI state using a DCI (beam indication) (see Figure 12A).

[0229] The TCI code point indicated by the beam indication may correspond to one or more (two) TCI states (first separate (DL / UL) TCI state / second separate (DL / UL) TCI state) (see Figure 12B).

[0230] In the example shown in Figure 12B, all TCI code points corresponding to the active TCI state correspond to two TCI states (first separate (DL / UL) TCI state / second separate (DL / UL) TCI state), but an association may be used in which at least one TCI code point corresponding to the active TCI state corresponds to two TCI states. By using such an association, it is possible to dynamically switch between single TRP and multi-TRP.

[0231] Note that, in FIG. 12A , an example is shown in which separate TCI states are activated for the DL TCI state and the UL TCI state with respect to the TCI state activated by the MAC CE. However, even in the case of separate TCI states, the activated DL TCI state and the UL TCI state may include a common TCI state.

[0232] For multi-DCI based multi-TRP, the TCI state may be configured by RRC, activated by MAC CE, and / or indicated by DCI per CORESET pool index.

[0233] For multi-DCI based multi-TRP, in case of joint TCI state, the TCI state may be configured by RRC, activated by MAC CE, and indicated by DCI to the UE for a CORESET pool index of a first value (e.g., 0) (see Figure 13A). The indicated TCI state corresponding to the CORESET pool index of the first value may be referred to as the first TCI state.

[0234] The TCI code point indicated by the beam indication may correspond to one TCI state (first joint TCI state) (see FIG. 13B).

[0235] For multi-DCI based multi-TRP, in case of joint TCI state, the TCI state may be configured by RRC, activated by MAC CE, and indicated by DCI to the UE for a CORESET pool index of a second value (e.g., 1) (see Figure 14A). The indicated TCI state corresponding to the CORESET pool index of the second value may be referred to as the second TCI state.

[0236] The TCI code point indicated by the beam indication may correspond to one TCI state (second joint TCI state) (see FIG. 14B).

[0237] When the DCIs corresponding to each CORESET pool index indicate the same TCI state (TCI state ID) (for example, when TCI state #7 corresponding to TCI codepoint "111" in Figures 13B and 14B is indicated), the UE may determine that one TCI state is indicated. In this case, the UE may operate using a single TRP.

[0238] Although the above multi-DCI based multi-TRP has been described as an example using a joint TCI state, it can also be applied appropriately to cases using a separate TCI state.

[0239] In this disclosure, the terms indicated TCI state, Rel. 17 TCI state, common TCI state, and unified TCI state may be interchangeable. In this disclosure, the terms common TCI state, Rel. 17 TCI state, and Rel. 18 TCI state that apply to channels / signals that utilize multiple TRPs may be interchangeable.

[0240] The UE may apply the indicated TCI state to a particular channel / signal.

[0241] The specific channel / signal may be a UE-specific (dedicated) DL channel / signal, which may be a UE-specific PDCCH / PDSCH / CSI-RS (e.g., aperiodic (A-) CSI-RS).

[0242] The specific channel / signal may be a specific UL channel / signal, which may be at least one of a DCI-indicated (dynamic grant-indicated) PUSCH, a configured grant PUSCH, multiple (all) specific PUCCHs (resources), and an SRS (e.g., an aperiodic (A-) SRS).

[0243] One or more (eg, two) indicated TCI states may be indicated based on the method described in the 0th embodiment above.

[0244] Each of the following embodiments of the present disclosure may be applied to a PDSCH with a single TRP.

[0245] The PDSCH of a single TRP may be scheduled with a specific DCI (DCI format). The specific DCI format may be, for example, DCI format 1_0 (or a DCI format that does not include a TCI field). The specific DCI format may be DCI format 1_1 / 1_2. The specific DCI format may indicate one TCI state.

[0246] The QCL assumption for the PDSCH of a single TRP may be the default TCI state, which may be one TCI state (in any DCI format).

[0247] The UE may not be configured for multi-TRP repeated transmission, and the single-TRP PDSCH may be scheduled as a PDSCH with single layer MIMO.

[0248] The single-TRP PDSCH may be the PDSCH when the UE is not configured with multi-TRP (e.g., CORESET pool index).

[0249] The PDSCH of a single TRP may be a PDSCH scheduled with a CORESET of at least the CSS. The PDSCH of a single TRP may be a PDSCH scheduled with a CORESET of only the CSS (or a CSS excluding the Type 3 CSS).

[0250] Each of the following embodiments of the present disclosure may be applied to a multi-TRP PDSCH.

[0251] The PDSCH of a single TRP may be scheduled with a specific DCI (DCI format), which may be DCI format 1_1 / 1-2, and which may indicate two TCI states.

[0252] The QCL assumption for the multi-TRP PDSCH may be the default TCI state, which may be two TCI states (in any DCI format).

[0253] The UE may not be configured for multi-TRP repeated transmission, and the multi-TRP PDSCH may be scheduled as a PDSCH with multi-layer MIMO.

[0254] The multi-TRP PDSCH may be a PDSCH when the UE is configured for multi-TRP repetition transmission, and may then be scheduled as a PDSCH with repetition (using TDM / FDM / SDM).

[0255] The multi-TRP PDSCH may be a PDSCH when the UE is configured with SFN scheme A / B. The multi-TRP PDSCH may be a PDSCH with multiple TCI states.

[0256] Each of the following embodiments of the present disclosure may be applied to a single TRP PDCCH.

[0257] The PDCCH of a single TRP may be a PDCCH associated with a CORESET in which the SFN scheme A / B is not configured.

[0258] The PDCCH of a single TRP may be a PDCCH associated with a CORESET in which repetitive transmission (of two linked SSs) is not configured.

[0259] Each of the following embodiments of the present disclosure may be applied to a multi-TRP PDCCH.

[0260] The multi-TRP PDCCH may be a PDCCH associated with a CORESET in which SFN scheme A / B is configured.

[0261] Each of the following embodiments of the present disclosure may be applied to a single TRP PUSCH / PUCCH.

[0262] The PUSCH / PUCCH of a single TRP may be a PUSCH / PUCCH in which repeated transmission of a multi-TRP is not configured.

[0263] Each of the following embodiments of the present disclosure may be applied to multi-TRP PUSCH / PUCCH.

[0264] The PUSCH / PUCCH of the multi-TRP may be a PUSCH / PUCCH for which repeated transmission of the multi-TRP is set.

[0265] Each of the following embodiments of the present disclosure may be applied to single / multi-TRP CSI-RS / SRS.

[0266] In this disclosure, the terms "single-TRP transmission and reception," "single-TRP mode," and "channel / signal using a single-TRP" may be interchangeable. In this disclosure, the terms "multi-TRP transmission and reception," "multi-TRP mode," and "multi-TRP channel / signal" may be interchangeable. In this disclosure, the terms "single / multi-TRP is configured / instructed," "single / multi-TRP transmission and reception is configured / instructed," "single / multi-TRP mode is configured / instructed," and "channel / signal using a single / multi-TRP is configured / instructed / scheduled / triggered" may be interchangeable.

[0267] In the present disclosure, the terms schedule, trigger, instruct, set, and activate may be read interchangeably.

[0268] First Embodiment In the first embodiment, a TCI field included in DCI will be described.

[0269] The number of bits of the TCI field included in the beam instruction DCI may be a specific value (e.g., a fixed value).

[0270] The specific value may be configured in the UE using higher layer signaling (RRC signaling).

[0271] The UE may receive multiple DCIs scheduling multiple PDSCHs, where one DCI may schedule one PDSCH.

[0272] The UE may transmit HARQ-ACKs associated with multiple PDSCHs in one transmission opportunity.

[0273] In the present disclosure, the terms (HARQ-ACK) transmission opportunity, PUSCH, PUCCH, PUSCH / PUCCH resource, and slot may be read interchangeably.

[0274] When a UE transmits HARQ-ACKs related to multiple PDSCHs in one transmission opportunity, the TCI field of only one of the DCIs that schedule the multiple PDSCHs may be valid (as a TCI field for beam indication), and the TCI fields of the other DCIs may be invalid (as TCI fields for beam indication).

[0275] The DCI for which the TCI field is enabled may be any DCI among multiple DCIs. In the present disclosure, the DCI for which the TCI field is used (for which the TCI field is enabled) (e.g., DCI #4 in FIG. 8 above) may be referred to as a "specific DCI."

[0276] The TCI field included in one or more DCIs (e.g., DCIs #1-#3 in FIG. 8 above) in which the TCI field is not used (the TCI field is disabled) may be used for a different purpose / use. In the present disclosure, the DCIs (e.g., DCIs #1-3 in FIG. 8 above) in which the TCI field is not used (the TCI field is disabled) may be referred to as "other DCIs."

[0277] In the present disclosure, "the TCI field is enabled," "the TCI field is used," and "the TCI field is used as a TCI field for beam direction" may be read interchangeably.

[0278] In the present disclosure, "the TCI field is disabled," "the TCI field is not used," and "the TCI field is not used as a TCI field for beam direction" may be read interchangeably.

[0279] The following describes the indication of the TCI state of each scheduled / triggered channel / signal (e.g., at least one of scheduled PDSCH / PUSCH and triggered aperiodic (A-)SRS / A-CSI-RS / PUCCH (e.g., HARQ-ACK)).

[0280] The beam indication DCI may indicate one or more (e.g., two) TCI states to the UE. The TCI states may be "indicated TCI states." The "indicated TCI states" may start to apply after (the next slot after) the BAT has elapsed, as described above.

[0281] The UE may receive a DCI (scheduling / triggering DCI) that schedules / trigger each channel / signal, which may be the same DCI as the beam direction DCI or a different DCI.

[0282] The UE may follow at least one of Options 1-A and 1-B below for TCI fields of DCI (scheduling / triggering DCI) that do not indicate "indicated TCI state".

[0283] [Option 1-A] When an "indicated TCI state" is applied to a channel / signal and multiple (e.g., two) "indicated TCI states" are indicated, the UE may select / determine one TCI state from the multiple "indicated TCI states" based on the scheduling / triggering DCI ("other DCI").

[0284] The TCI field included in the scheduling / triggering DCI may indicate which of multiple indicated TCI states applies.

[0285] If there is only one "indicated TCI state" and that one indicated TCI state applies to the channel / signal, the UE may ignore the TCI field in the scheduling / triggering DCI ("other DCI").

[0286] 15A-15D are diagrams showing an example of TCI status indication according to option 1-A / 1-B.

[0287] As shown in Figure 15A, the UE may be instructed by the beam instruction DCI to have multiple "instructed TCI states." In the example shown in Figure 15A, TCI state #1 is instructed as the first TCI state, and TCI state #2 is instructed as the second TCI state.

[0288] In the example shown in FIG. 15A, the joint / (separate) DL TCI state is shown as the indicated TCI state, but the indicated TCI state may also be the (separate) UL TCI state.

[0289] FIG. 15B shows an example of a TCI field included in a "specific DCI." In FIG. 15B, the TCI field included in the specific DCI indicates a "specified TCI state." Based on the TCI field included in the specific DCI, the UE starts applying the "specified TCI state" according to the TCI field after (the next slot after) the BAT has elapsed since the transmission of the HARQ-ACK related to the specific DCI (the last symbol of the PUSCH / PUCCH transmitting the HARQ-ACK). In other words, the UE changes / updates the state in which the "specified TCI state" shown in FIG. 15A is applied to the state in which the "specified TCI state" shown in FIG. 15B is applied.

[0290] Figure 15C is a diagram showing an example of a TCI field according to Option 1-A. The example shown in Figure 15C describes (the interpretation of) the TCI field included in the scheduling / triggering DCI (particularly, "other DCI").

[0291] In the example shown in FIG. 15C, the UE determines the TCI state to apply to each channel / signal based on the TCI field included in the scheduling / triggering DCI of each channel / signal.

[0292] At this time, the UE may determine, based on the TCI field, to apply one of the "indicated TCI states" that have already started to be applied.

[0293] In the example shown in Figure 15C, if the code point of the TCI field included in the scheduling / triggering DCI is "000", the UE determines that the first TCI state (i.e., TCI state #1 in Figure 15A) of the indicated TCI states should be applied to the channel / signal corresponding to the DCI. Also, if the code point of the TCI field included in the scheduling / triggering DCI is "001", the UE determines that the second TCI state (i.e., TCI state #2 in Figure 15A) of the indicated TCI states should be applied to the channel / signal corresponding to the DCI.

[0294] In this case, the UE may not assume / expect to receive a DCI including a TCI field indicating a code point that does not indicate any of the multiple "indicated TCI states" (e.g., in the example of Figure 15C, code points "010" to "111").

[0295] [Option 1-B] A list of TCI states may be configured for the UE. The list may include multiple TCI states. As described above, the list of TCI states may be configured using RRC signaling. The TCI states may be referred to as "configured TCI states."

[0296] Alternatively, the UE may be configured with a list of TCI states, from which one or more TCI states may be activated. As mentioned above, the TCI states may be activated using MAC CE. The TCI states may also be referred to as "configured TCI states."

[0297] The UE may apply at least one of the "configured TCI states" to each channel / signal, and may apply one or more (e.g., two) TCI states from the "configured TCI states" based on a TCI field included in the scheduling / triggering DCI (especially, "other DCI") of the channel / signal.

[0298] Figure 15D is a diagram showing an example of TCI fields according to Option 1-B. The example shown in Figure 15D describes TCI fields included in the scheduling / triggering DCI (particularly, "other DCI").

[0299] In the example shown in FIG. 15D, the UE determines the TCI state to apply to each channel / signal based on the TCI field included in the scheduling / triggering DCI of each channel / signal.

[0300] In Figure 15D, for example, if the code point of the TCI field included in the scheduling / triggering DCI is "000", the UE determines that, of the TCI states to be set, TCI state #16 should be applied to the channel / signal scheduled / triggered by the DCI.

[0301] Fig. 16 is a diagram showing an example of application of the TCI state according to the first embodiment. Reception of DCI and scheduling of PDSCH in Fig. 16 are the same as those in Fig. 8 described above.

[0302] The UE applies PDSCH#1-PDSCH#3 based on the TCI fields included in DCI#1-#3, respectively. As described above, DCI#1-#3 are DCIs in which the TCI fields included in the DCI are not used to indicate the "indicated TCI state." In the example of Figure 16, DCI#1-#3 indicate TCI state #1, so the UE applies TCI state #1 to PDSCH#1-PDSCH#3.

[0303] The UE determines that the TCI state indicated in DCI #4 will begin to be applied (the next slot) after BAT (BeamAppTime_r17) has elapsed since the transmission of the HARQ-ACK related to that DCI (the final symbol of the PUSCH / PUCCH that transmits the HARQ-ACK).

[0304] The "specific DCI" and the "other DCI" may correspond to the same HARQ-ACK (transmission opportunity (PUSCH / PUCCH / slot) for transmitting). In this case, it may be determined that any of a plurality of DCIs is the "specific DCI" or the "other DCI" based on the time / frequency domain resources of a plurality of DCIs (PDCCH / CORESET / search spaces) corresponding to the same HARQ-ACK.

[0305] For example, the specific DCI may be the earliest / latest DCI in the time domain among multiple DCIs (PDCCHs / CORESETs / search spaces that respectively carry the multiple DCIs). For example, the specific DCI may be the DCI with the lowest / highest component carrier (CC) index (or control channel element (CCE) index) in the frequency domain among multiple DCIs (PDCCHs / CORESETs / search spaces that respectively carry the multiple DCIs). Alternatively, the specific DCI may be determined according to a rule for selecting one DCI for determining PUCCH resource indication (e.g., a rule based on a CCE index / PUCCH resource indicator (PRI)). Alternatively, at least two of these rules may be applied in combination.

[0306] According to the first embodiment described above, even when multiple DCIs that schedule / trigger multiple channels / signals are received, it is possible to appropriately determine whether to apply a TCI state to each channel / signal and whether to start applying a common TCI state.

[0307] The above-described first embodiment may be applied to at least one of the cases where a single TRP is set (single TRP mode) and the cases where multiple TRPs are set (multi-TRP mode).

[0308] <Modification of First Embodiment> Regarding the "indicated TCI state" in Rel. 17, a case is assumed in which the "indicated TCI state" cannot be controlled by the scheduling / triggering DCI.

[0309] In this case, a delay in beam direction occurs, which becomes a problem.

[0310] Therefore, a method for solving this problem will be described below.

[0311] A set including one or more common TCI states ("indicated TCI states") may be indicated to the UE. One or more of such sets may be indicated to the UE.

[0312] The indication may be made using, for example, MAC CE / DCI.

[0313] One or more of these sets may be indicated to the UE by a beam indication DCI (e.g., DCI format 1_1 / 1_2 with / without DL assignment).

[0314] If multiple such sets are indicated, the UE may be indicated the TCI state of the scheduled / triggered channels / signals by a scheduling / triggering DCI (e.g., DCI format 0_1 / 0_2 / 1_1 / 1_2).

[0315] In this case, the indicated TCI state may be indicated by multiple DCIs (i.e., a beam indication DCI and a scheduling / triggering DCI). Such an indication may be referred to as a two-stage (2 stage (step)) DCI indication.

[0316] Fig. 17 is a diagram illustrating an example of indicating a TCI state according to a modification of the first embodiment. In the example illustrated in Fig. 17, multiple TCI states are configured / activated for a UE using RRC signaling / MAC CE.

[0317] In the example shown in Figure 17, the UE is instructed to select a set of TCI states using MAC CE / DCI (DCI #1), which may be, for example, a beam instruction DCI. The UE is then instructed to select two TCI states (a first joint TCI state and a second joint TCI state) using DCI #2, which may be, for example, a scheduling / triggering DCI.

[0318] In the example of Figure 17, an example of multiple (two) TCI states in a multi-TRP (mode) is described, but this modified example can also be applied to a single-TRP (mode).

[0319] 18 is a diagram showing another example of a TCI state indication according to a modification of the first embodiment. In the example shown in FIG. 18, a UE receives DCI #1 as a beam indication DCI. The TCI state indicated by DCI #1 starts to be applied (in the next slot) after a predetermined period (BAT) has elapsed since the transmission of a HARQ-ACK related to DCI #1 (the final symbol of the PUSCH / PUCCH transmitting the HARQ-ACK).

[0320] The UE then receives DCI#2, which is the scheduling DCI for PDSCH#2.

[0321] In the example shown in FIG. 18, the two-stage DCI indication indicates the TCI state to be applied to PDSCH#2 based on the TCI fields included in DCI#1 and DCI#2, respectively.

[0322] Fig. 19 is a diagram showing another example of an indication of the TCI state according to the modification of the first embodiment, showing the correspondence between the code points in the TCI field and the TCI state.

[0323] In the example shown in Figure 19, four sets (first to fourth sets) are indicated to the UE. In the two-stage DCI indication, the UE is indicated the codepoint of the TCI field in the beam indication DCI (e.g., DCI #1 in Figure 18 above). Then, the UE is indicated one of the four sets using a specific field (e.g., TCI field) included in the scheduling / triggering DCI (e.g., DCI #2 in Figure 18 above).

[0324] In this way, by applying the two-stage DCI indication, it is possible to reduce the size of the TCI field.

[0325] In Rel. 15, for DCI format 1_1, the number of bits in the TCI field can be set to 3 bits by RRC.

[0326] In Rel. 16, for DCI format 1_2, the number of bits in the TCI field can be set by RRC from 0 to 3 bits.

[0327] If two-stage DCI indication is supported, it is possible to reduce the number of TCI states.

[0328] For example, if two-stage DCI indication is not supported (i.e., indication by existing DCI, which may also be referred to as one-stage (1 stage) DCI indication), a 3-bit TCI field of the beam indication DCI is utilized, allowing one TCI state to be selected from a maximum of eight TCI states.

[0329] On the other hand, when two-stage DCI indication is supported, the 3-bit TCI field of the beam indication DCI and the 3-bit TCI field of the scheduling / triggering DCI can be used, so that one TCI state can be selected from a maximum of 64 TCI states.

[0330] This means that when applying two-stage DCI indication with the same flexibility (i.e., selecting one TCI state from a maximum of eight TCI states) compared to when applying one-stage DCI indication, the number of bits of the TCI field included in each DCI can be reduced.

[0331] In addition, in the above-mentioned two-stage DCI instruction, the beam instruction DCI and the scheduling / triggering DCI may be read as interchangeable.

[0332] Note that the "indicated TCI state" may be shared among different channels / signals. If the UE does not receive a DCI (e.g., a scheduling / triggering DCI) indicating a set of TCI states from a set of multiple TCI states, the UE may decide to select a specific set.

[0333] The particular set may be pre-specified, for example, the set with the lowest (or highest) index.

[0334] Alternatively, the particular set may be configured (as a default) for the UE using higher layer signaling (RRC).

[0335] Note that this modification may be applied only when multiple sets (of TCI states) are instructed (configured) to the UE.

[0336] Second Embodiment: To support multi-TRP operation, a larger number of DCI bits are required compared to the single-TRP case (see Figure 20). As shown in Figure 20, the DCI for the multi-TRP case may include fields / information that are only used in the multi-TRP mode.

[0337] For example, in order to support the repetition of a multi-TRP PUSCH, it is considered that the scheduling DCI (e.g., DCI format 0_1 / 0_2) may require at least one of a field for switching between single-TRP and multi-TRP, a field for switching SRI, and a field for switching TPMI.

[0338] Therefore, in the present embodiment, a method for solving this problem will be described below.

[0339] A multi-TRP (mode) / single-TRP (mode) may be configured for the UE. In this case, the size of the DCI may be determined depending on the multi-TRP mode.

[0340] For example, when multi-TRP (mode) / single-TRP (mode) is configured for a UE, the size of the DCI in single-TRP mode may be determined based on the size of the DCI in multi-TRP mode.

[0341] For example, when multi-TRP (mode) / single-TRP (mode) is configured for a UE, the size of the DCI in single-TRP mode may be the same as the size of the DCI in multi-TRP mode.

[0342] In this case, the common TCI state may not be applied to certain channels (e.g., PUSCH repetitions of multi-TRP), and for example, the spatial relationship specified in Rel. 15 / 16 may be applied to such channels.

[0343] The UE may be configured to apply a common TCI state (and transmit / receive (scheme) for channels (PDSCH / PDCCH / PUSCH / PUCCH) using multiple TRPs). In this case, when the DCI indicates single TRP mode, the UE may ignore (or not use) specific fields included in the DCI.

[0344] <<Switching Between Single and Multi-TRP (Mode)>> In Rel. 18 and later, dynamic switching between single-TRP (mode) and multi-TRP (mode) may be supported.

[0345] The switching may be performed by a DCI, and the DCI field may be included in a specific DCI. For example, the specific DCI may be a DCI that schedules PDSCH / PUSCH (e.g., DCI format 0_0 / 0_1 / 0_2 / 1_0 / 1_1 / 1_2) or a beam instruction DCI.

[0346] The switching may be performed using, for example, the TCI field. The UE may determine the single-TRP (mode) / multi-TRP (mode) based on the number of TCI states corresponding to one TCI code point.

[0347] 21A is a diagram showing an example of switching between single-TRP and multi-TRP according to the second embodiment. Correspondence between the code points of the TCI field as shown in FIG. 21A and one or more (two) TCI states may be specified / set.

[0348] The correspondence may be defined in advance in a specification, or may be configured in the UE using higher layer signaling (RRC / MAC CE).

[0349] The UE determines that it is in single-TRP mode if the code point in the indicated TCI field corresponds to one TCI state (i.e., code points "000" to "011"), and determines that it is in multi-TRP mode if the code point in the indicated TCI field corresponds to two TCI states (i.e., code points "100" to "111").

[0350] Also, for each channel / signal, a DCI field may be defined that indicates at least one of single-TRP (mode) or multi-TRP (mode) and the order of the indicated TCI states. In this disclosure, this DCI field may be referred to as a new DCI field.

[0351] If the code points of the indicated TCI field correspond to the same two TCI states, the UE may determine that it is in single-TRP mode. If the code points of the indicated TCI field correspond to two different TCI states, the UE may determine that it is in multi-TRP mode.

[0352] 21B to 21D are diagrams showing other examples of switching between single-TRP and multi-TRP according to the second embodiment. Correspondence between code points of the DCI field as shown in Fig. 21B to 21D and one or more (two) TCI states may be specified / set.

[0353] The correspondence may be defined in advance in a specification, or may be configured in the UE using higher layer signaling (RRC / MAC CE).

[0354] The example shown in FIG. 21B shows the correspondence between the code points of the DCI field and the indication regarding the TCI state.

[0355] In the example shown in Figure 21B, when the code point of the DCI field indicates "00", it indicates that the channel / signal associated with the DCI is a single-TRP transmission and the first TCI state applies, and when the code point of the DCI field indicates "01", it indicates that the channel / signal associated with the DCI is a single-TRP transmission and the second TCI state applies.

[0356] Furthermore, if the code point of the DCI field indicates "10", it indicates that the channel / signal associated with the DCI is a multi-TRP transmission and that the TCI states to be applied to each channel / signal index in ascending order are the first TCI state, then the second TCI state.Also, if the code point of the DCI field indicates "11", it indicates that the channel / signal associated with the DCI is a multi-TRP transmission and that the TCI states to be applied to each channel / signal index in ascending order are the second TCI state, then the first TCI state.

[0357] The examples shown in Figures 21C and 21D show the correspondence between the code points of the DCI field and the TCI status indication for a single TRP. The example shown in Figure 21C shows the correspondence between the code points of the DCI field and the TCI status indication for a single TRP or a multi-TRP.

[0358] In the example shown in Figure 21C, when the code point of the DCI field indicates "0", it indicates that the channel / signal associated with the DCI is a single-TRP transmission and the first TCI state applies, and when the code point of the DCI field indicates "1", it indicates that the channel / signal associated with the DCI is a single-TRP transmission and the second TCI state applies.

[0359] In the example shown in Figure 21D, when the code point of the DCI field indicates "0", it indicates that the channel / signal associated with the DCI is a single-TRP transmission and the first TCI state is applied. Also, when the code point of the DCI field indicates "1", it indicates that the channel / signal associated with the DCI is a multi-TRP transmission and the TCI states applied to each channel / signal in ascending order are the first TCI state, then the second TCI state.

[0360] 21A to 21D, the terms "first" and "second" may be interchangeable. Furthermore, the number of bits in the DCI field, the correspondence between the DCI code point and the TCI status indication are merely examples, and are not limiting.

[0361] <<DCI Size Switching>> The following describes switching / updating the DCI size (payload) associated with dynamic switching between single TRP mode and multi-TRP mode.

[0362] The UE may be instructed to use the single-TRP mode / multi-TRP mode, and this instruction may be made using DCI / MAC CE.

[0363] If the indicated mode is a different mode than the mode in which the UE is operating, the DCI size of the DL / UL DCI may be changed / switched / updated (see Figure 22).

[0364] The DL DCI may be, for example, DCI format 1_1 / 1_2, and the UL DCI may be, for example, DCI format 0_1 / 0_2.

[0365] If single TRP mode is indicated to the UE, the DCI size of the DL / UL DCI may be determined for the single TRP mode.

[0366] When the multi-TRP mode is indicated to the UE, the DCI size of the DL / UL DCI may be determined for the multi-TRP mode.

[0367] The DCI size for single-TRP mode may be smaller than the DCI size for multi-TRP mode. The UE may assume / expect that the DCI size for single-TRP mode is smaller than the DCI size for multi-TRP mode.

[0368] For example, the TCI field included in the DCI for single-TRP mode may be X bits (e.g., X=3). Also, for example, the TCI field included in the DCI for multi-TRP mode may be N×X bits (e.g., X=3), where N may be the number of TRPs (e.g., N=2).

[0369] Note that this embodiment may be applied (only) when dynamic switching of DCI size between single TRP mode and multi-TRP mode is configured for the UE.

[0370] Blind Detection of DCI Formats In blind detection of DCI formats, the UE and the network (e.g., base station) need to have a common understanding of the size of the DCI.

[0371] The above-mentioned switching of DCI size may cause a misunderstanding (misunderstanding) regarding the DCI size between the UE and the network.

[0372] The following describes the timeline for switching between single / multiple TRP modes (and DCI size switching).

[0373] Similar to the BAT defined in Rel. 17 as described above, the timing for switching between single / multiple TRP modes (and switching DCI sizes) may be defined in the specifications.

[0374] The timing for switching between single / multiple TRP modes (and DCI size switching) may be the same timeline as BAT, or may be a newly defined timeline (different from BAT).

[0375] Since the difference in the understanding of the "indicated TCI state" between the UE and the network can be a serious problem, the BAT after HARQ-ACK transmission is defined to reduce the probability of misses (for example, to 0.1 percent or less). The same effect can be achieved by specifying the timing for switching between single / multiple TRP modes (and DCI size switching).

[0376] The timing (first timing) of applying (starting) the mode indicated by the DCI may be the same as the timing (second timing) of applying (starting) the mode indicated by the MAC CE. For example, the first timing and the second timing may be values ​​defined in advance in a specification, may be values ​​set by higher layer signaling (RRC), or may be determined based on reported UE capability information.

[0377] 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 be specified separately. For example, at least one of the first timing and the second timing may be a value specified in advance in a specification, a value configured by higher layer signaling (RRC), or may be determined based on reported UE capability information. For example, the second timing may be the next slot after a specific time (e.g., X ms (e.g., X = 3)) from the transmission of the HARQ-ACK associated with the MAC CE (the last symbol of the PUSCH / PUCCH transmitting the HARQ-ACK).

[0378] 23 is a diagram illustrating an example of switching between single-TRP and multi-TRP modes according to the second embodiment. In FIG. 23, a UE receives a DCI indicating multi-TRP mode while operating in single-TRP mode. The UE receives a PDSCH scheduled by the DCI and transmits a HARQ-ACK corresponding to the PDSCH.

[0379] At this time, the UE switches to the multi-TRP mode indicated by the DCI (the next slot) after a specific time (in Figure 23, the time given by BeamAppTime_r17) has elapsed since the transmission of the HARQ-ACK (the final symbol of the PUSCH / PUCCH that transmits the HARQ-ACK).

[0380] 24 is a diagram showing another example of switching between single-TRP and multi-TRP modes according to the second embodiment. In FIG. 24, when a UE is operating in single-TRP mode, the UE receives a MAC CE indicating multi-TRP mode on a PDSCH. The UE then transmits a HARQ-ACK corresponding to the PDSCH.

[0381] At this time, the UE switches to the multi-TRP mode indicated by the MAC CE after a specific time (3 ms in FIG. 24) has elapsed since the transmission of the HARQ-ACK (the final symbol of the PUSCH / PUCCH that transmits the HARQ-ACK) (the next slot).

[0382] In the case where HARQ-ACKs related to multiple DCIs are transmitted in the same transmission opportunity (PUSCH / PUCCH / slot), the UE may switch between single / multiple TRP modes according to the mode for the TRP indicated by a specific DCI among the multiple DCIs.

[0383] For example, the particular DCI may be determined based on the time / frequency resources of multiple DCIs.

[0384] For example, the specific DCI may be the earliest / latest DCI in the time domain among multiple DCIs (PDCCHs / CORESETs / search spaces that respectively carry the multiple DCIs). For example, the specific DCI may be the DCI with the lowest / highest component carrier (CC) index (or control channel element (CCE) index) in the frequency domain among multiple DCIs (PDCCHs / CORESETs / search spaces that respectively carry the multiple DCIs). Alternatively, the specific DCI may be determined according to a rule for selecting one DCI for determining PUCCH resource indication (e.g., a rule based on a CCE index / PUCCH resource indicator (PRI)). Alternatively, at least two of these rules may be applied in combination.

[0385] 25 is a diagram illustrating another example of switching between single and multi-TRP modes according to the second embodiment. In FIG. 25, the reception of DCI, the scheduling / reception of PDSCH, and the transmission of HARQ-ACK are the same as those in FIG. 8 described above.

[0386] In Figure 25, DCI #1-DCI #3 indicate single-TRP mode, and DCI #4 indicates multi-TRP mode. In Figure 25, for the multi-TRP mode indicated by DCI #4, which is the latest in the time domain, the UE switches to multi-TRP mode after a specific time (the time given by BeamAppTime_r17 in Figure 25) has elapsed since the transmission of the HARQ-ACK associated with DCI #1-DCI #4 (the last symbol of the PUSCH / PUCCH transmitting the HARQ-ACK).

[0387] In the example shown in FIG. 25, the DCI to be selected is determined based on the time domain, but the method for selecting the DCI is not limited to this.

[0388] When either single-TRP mode or multi-TRP mode is indicated / determined based on the number of TCI states, it is reasonable to use the BAT to determine the DCI size (switching between TRP modes). Therefore, when either single-TRP mode or multi-TRP mode is indicated / determined based on the number of TCI states (for example, when the DCI fields described in Figure 21A above are used), the BAT may be used to determine the DCI size (switching between TRP modes).

[0389] When either single TRP mode or multi-TRP mode is indicated / determined based on a specific DCI field (e.g., a new DCI field defined in Figures 21B / C / D), operations for a UE to receive a DCI indicating single TRP / multi-TRP mode may be specified.

[0390] The action / mechanism may be at least one of the following options 2-1 and 2-2.

[0391] [Option 2-1] The UE may determine / change / update the DCI size (TRP mode) a specific time (e.g., Y symbols) after (the next slot after) the transmission of the HARQ-ACK associated with the DCI containing a specific field (the last symbol of the PUSCH / PUCCH transmitting the HARQ-ACK).

[0392] The value Y may be predefined in the specifications or configured in the UE by higher layer signaling (RRC / MAC CE). The higher layer signaling may be a newly defined RRC parameter (in Rel. 18 or later) or an RRC parameter related to BAT (e.g., BeamAppTime_r17). Alternatively, the value Y may be reported as part of the UE capabilities.

[0393] Although symbols are used as units of Y above, the units of Y may be, for example, subframes / slots / subslots / ms (milliseconds).

[0394] [Option 2-2] The UE may determine / change / update the DCI size (TRP mode) after a specific time (e.g., BAT) has elapsed since the transmission of the HARQ-ACK associated with the beam instruction DCI (the last symbol of the PUSH / PUCCH transmitting the HARQ-ACK).

[0395] In other words, the DCI used to indicate / determine / change the DCI size (TRP mode) may be a beam indication DCI.

[0396] The beam indication DCI may be a DCI indicating the "indicated TCI state", regardless of whether or not there is a DL assignment.

[0397] 26 is a diagram showing another example of switching between single and multi-TRP modes according to Option 2-2. DCI reception, PDSCH scheduling / reception, and HARQ-ACK transmission in FIG. 26 are the same as those in FIG. 25 above.

[0398] In Figure 26, DCI #1-DCI #3 indicate single-TRP mode, and DCI #4 indicates multi-TRP mode. Also in Figure 26, DCI #4 is a beam indication DCI that indicates the TCI state ("indicated TCI state"). In Figure 26, DCI #4 includes a new DCI field.

[0399] In Figure 26, for the multi-TRP mode indicated by DCI #4, which is a beam instruction DCI, the UE switches to the multi-TRP mode (the next slot) after a specific time (in Figure 26, the time given by BeamAppTime_r17) has elapsed since the transmission of the HARQ-ACK related to DCI #1-#4 (the last symbol of the PUSCH / PUCCH that transmits the HARQ-ACK).

[0400] According to the second embodiment described above, the size of the DCI can be appropriately determined / controlled in both cases where a single TRP is used and where multiple TRPs are used.

[0401] <Modifications> Each embodiment / option / choice of the present disclosure may be supported in intra-cell / inter-cell beam direction.

[0402] In each embodiment / option / alternative of the present disclosure, a TRP-specific (additional) Transmitted Precoding Matrix Indicator (TPMI) field / SRI field for PUSCH using multiple TRPs in Rel. 17 may be used.

[0403] <Supplementary Note> At least one of the above-described embodiments may be applied only to UEs that have reported or support a specific UE capability.

[0404] The specific UE capabilities may indicate at least one of the following: Supporting specific processing / operations / control / information for at least one of the above embodiments; Supporting (dynamic) beam pointing of scheduled / triggered channels / signals (e.g., as described in the first embodiment); Supporting (dynamic) DCI size switching between single-TRP mode and multi-TRP mode; Supporting a set of multiple TCI states (e.g., as described in a variant of the first embodiment).

[0405] Support for (dynamic) DCI size switching between single-TRP mode and multi-TRP mode may be reported (independently) for each UL DCI, or (independently) for each DL DCI, or jointly for both UL and DL DCIs.

[0406] Support for (dynamic) DCI size switching between single TRP mode and multi-TRP mode may be reported (independently) for each joint TCI state, or (independently) for each separate TCI state, or reported jointly for both joint TCI state and separate TCI state.

[0407] Support for multiple sets of TCI states may be reported by the number of such sets.

[0408] Furthermore, the specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (e.g., cell, band, BWP), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)).

[0409] Furthermore, the specific UE capability may be a capability that is applied to all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0410] Furthermore, at least one of the above-described embodiments may be applied when the UE is configured with specific information related to the above-described embodiments by higher layer signaling, such as information indicating that a common TCI state is enabled, any RRC parameter for a specific release (e.g., Rel. 18), etc.

[0411] If the UE does not support at least one of the specific UE capabilities or is not configured with the specific information, the UE may apply, for example, the behavior of Rel. 15 / 16 / 17.

[0412] (Supplementary Note A) The following invention is supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal including: a receiver that receives first downlink control information (DCI) that schedules a signal corresponding to a transmission opportunity of a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) and a second DCI for a beam instruction corresponding to the transmission opportunity; and a controller that determines a first transmission configuration indication (TCI) state to apply to the signal based on a first transmission configuration indication (TCI) field included in the first DCI, and determines a second TCI state that begins to be applied after a specific period has elapsed from a final symbol 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 that is applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state that is applied to a DL signal and a TCI state that is applied to a UL signal. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the controller applies, to the channel as the first TCI state, one of a plurality of TCI states for a plurality of signals for which application has already begun, based on the first TCI field. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the controller applies, to the channel as the first TCI state, one of a plurality of TCI states set using higher layer signaling, based on the first TCI field. [Supplementary Note 4] The terminal according to any of Supplements 1 to 3, wherein the receiver further receives a third DCI scheduling a signal different from the signal after the specific period has elapsed, the third DCI including a field related to an indication of a set of TCI states, and the controller further determines the third TCI state to apply to the different signal based on the second DCI and the third DCI.

[0413] (Supplementary Note B) The following invention is added to one embodiment of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiving unit that receives instruction information instructing either transmission and reception using a single transmission / reception point (TRP) or transmission and reception using multiple TRPs; and a control unit that determines, based on the instruction information, at least one of a first switch regarding transmission and reception using the single TRP or transmission and reception using the multiple TRPs, and a second switch regarding a size of downlink control information (DCI), wherein the transmission configuration indication (TCI) state indicated using the instruction 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. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the control unit determines at least one of the first switch and the second switch based on the number of TCI states corresponding to code points in a TCI field included in the instruction information. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the control unit determines at least one of the first switching and the second switching based on a field indicating at least one of information indicating transmission / reception using the single TRP or transmission / reception using the multi-TRP, and information regarding application of a TCI state, which is included in the instruction information. [Supplementary Note 4] The terminal according to any of Supplementary Note 1 to Supplementary Note 3, wherein the control unit performs at least one of the first switching and the second switching at a timing to start application of the TCI state instructed using the instruction information.

[0414] (Wireless Communication System) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0415] 27 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) specified by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0416] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0417] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0418] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0419] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0420] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0421] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

[0422] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0423] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0424] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0425] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0426] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0427] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0428] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0429] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), or the like may be used as an uplink channel.

[0430] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0431] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0432] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0433] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0434] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0435] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0436] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0437] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0438] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as a reference signal.

[0439] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0440] 28 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0441] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0442] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0443] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0444] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0445] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0446] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0447] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0448] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0449] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0450] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0451] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0452] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

[0453] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0454] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0455] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0456] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0457] The transceiver unit 120 may transmit first downlink control information (DCI) that schedules a signal corresponding to a transmission opportunity for a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) and a second DCI for beam direction corresponding to the transmission opportunity. The control unit 110 may use a first transmission configuration indication (TCI) field included in the first DCI to indicate a first TCI state to apply to the signal, and may use a second TCI field included in the second DCI to indicate a second TCI state that begins to be applied after a specific period has elapsed since the last symbol of the transmission opportunity. Each of the first TCI state and the second TCI state may be a TCI state that is applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state that is applied to a DL signal and a TCI state that is applied to a UL signal (first embodiment).

[0458] The transceiver unit 120 may transmit instruction information instructing either transmission and reception using a single transmission / reception point (TRP) or transmission and reception using multiple TRPs. The control unit 110 may use the instruction information to instruct at least one of a first switching regarding transmission and reception using the single TRP or transmission and reception using the multiple TRPs, and a second switching regarding the size of downlink control information (DCI). The transmission configuration indication (TCI) state indicated using the instruction information may 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 (second embodiment).

[0459] (User terminal) Fig. 29 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0460] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0461] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0462] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transceiver unit 220.

[0463] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0464] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0465] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0466] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0467] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0468] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0469] The transmitter / receiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0470] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and if not, it may not be necessary to perform DFT processing as the transmission processing.

[0471] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0472] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0473] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0474] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0475] The transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0476] The transceiver unit 220 may receive first downlink control information (DCI) scheduling a signal corresponding to a transmission opportunity for a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) and a second DCI for beam direction corresponding to the transmission opportunity. The control unit 210 may determine a first TCI state to apply to the signal based on a first transmission configuration indication (TCI) field included in the first DCI, and may determine a second TCI state that begins to be applied after a specific period has elapsed from the last symbol 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 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).

[0477] Based on the first TCI field, the control unit 210 may apply one of multiple TCI states for multiple signals that have already started to be applied to the channel as the first TCI state (first embodiment).

[0478] The control unit 210 may apply, based on the first TCI field, any one of a plurality of TCI states set using higher layer signaling to the channel as the first TCI state (first embodiment).

[0479] The transceiver unit 220 may further receive a third DCI that schedules a signal different from the first signal after the specific period has elapsed. The third DCI may include a field for indicating a set of TCI states. The control unit 210 may further determine a third TCI state to apply to the different signal based on the second DCI and the third DCI (first embodiment).

[0480] The transceiver unit 220 may receive instruction information instructing transmission and reception using a single transmission / reception point (TRP) or transmission and reception using multiple TRPs. Based on the instruction information, the control unit 210 may determine at least one of a first switching regarding transmission and reception using the single TRP or transmission and reception using the multiple TRPs, and a second switching regarding the size of downlink control information (DCI). The transmission configuration indication (TCI) state indicated using the instruction information may 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 (second embodiment).

[0481] The control unit 210 may determine at least one of the first switching and the second switching based on the number of TCI states corresponding to the code point of the TCI field included in the instruction information (second embodiment).

[0482] The control unit 210 may determine at least one of the first switching and the second switching based on a field included in the instruction information indicating at least one of information indicating either transmission and reception using the single TRP or transmission and reception using the multi-TRP, and information regarding the application of the TCI state (second embodiment).

[0483] The control unit 210 may perform at least one of the first switching and the second switching at the timing when application of the TCI state instructed using the instruction information starts (second embodiment).

[0484] (Hardware Configuration) Note that the block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0485] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As described above, the implementation method of each is not particularly limited.

[0486] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 30 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0487] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0488] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0489] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0490] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0491] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0492] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0493] Storage 1003 is a computer-readable recording medium and may be composed of at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0494] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0495] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0496] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0497] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0498] (Modifications) Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0499] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0500] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0501] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0502] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0503] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0504] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0505] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0506] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0507] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0508] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0509] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0510] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0511] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may be composed of one or more resource blocks.

[0512] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0513] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0514] A Bandwidth Part (BWP), which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0515] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0516] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0517] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0518] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0519] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0520] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0521] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0522] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0523] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0524] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as an RRC message, such as an RRC Connection Setup message or an RRC Connection Reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0525] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0526] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0527] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0528] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), these wired and / or wireless technologies are included within the definition of transmission media.

[0529] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0530] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0531] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0532] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0533] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0534] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0535] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0536] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0537] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0538] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0539] 31 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0540] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0541] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0542] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0543] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0544] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0545] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0546] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0547] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0548] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0549] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0550] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0551] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0552] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0553] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0554] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0555] Each aspect / embodiment described in the present disclosure may be a technology other than Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0556] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0557] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0558] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0559] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0560] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "deciding" some action.

[0561] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0562] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0563] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0564] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0565] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0566] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0567] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0568] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with "i-th" (i is an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0569] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0570] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A receiver that receives a first DCI for indicating a TCI state and a second DCI for scheduling a downlink shared channel (PDSCH); a control unit that determines, based on a TCI field included in the first DCI, a plurality of TCI states that will begin to be applied after a specific period has elapsed since the transmission of a HARQ-ACK related to the first DCI, and determines, based on a field included in the second DCI that indicates information regarding the application of a TCI state, a TCI state to be applied to the PDSCH from among the plurality of TCI states.

2. When the code point of the field indicates 00, the control unit applies a first TCI state of the plurality of TCI states to the PDSCH; If the code point of the field indicates 01, the control unit applies a second TCI state of the plurality of TCI states to the PDSCH; and The terminal according to claim 1 , wherein, when the code point of the field indicates 10, the control unit applies the first TCI state and the second TCI state of the plurality of TCI states to the PDSCH.

3. The terminal described in claim 1, wherein the multiple TCI states are TCI states that apply to both the downlink (DL) and the uplink (UL), or TCI states that apply to the DL.

4. A method for transmitting a downlink shared channel (PDSCH) using a first DCI for indicating a TCI state and a second DCI for scheduling a downlink shared channel (PDSCH); a step of determining, based on a TCI field included in the first DCI, a plurality of TCI states that will begin to be applied after a specific period has elapsed since the transmission of a HARQ-ACK related to the first DCI; and determining, based on a field included in the second DCI that indicates information regarding the application of a TCI state, a TCI state to be applied to the PDSCH from among the plurality of TCI states.

5. A transmitter that transmits a first DCI for indicating a TCI state and a second DCI for scheduling a downlink shared channel (PDSCH); a control unit that uses a TCI field included in the first DCI to indicate multiple TCI states that will begin to be applied after a specific period has elapsed since a terminal transmitted a HARQ-ACK related to the first DCI, and that uses a field included in the second DCI that indicates information regarding the application of TCI states to indicate a TCI state to be applied to the PDSCH from among the multiple TCI states.

6. A system including a terminal and a base station, The terminal a receiver for receiving a first DCI for indicating a TCI state and a second DCI for scheduling a downlink shared channel (PDSCH); a control unit that determines, based on a TCI field included in the first DCI, a plurality of TCI states that will be applied after a specific period has elapsed since the transmission of a HARQ-ACK related to the first DCI, and determines, based on a field included in the second DCI and indicating information related to the application of a TCI state, a TCI state to be applied to the PDSCH from among the plurality of TCI states; The base station A system comprising a transmitter that transmits the first DCI and the second DCI.