Terminal, wireless communication method, base station, and system

Abstract

A terminal according to one aspect of the present disclosure includes: a reception unit that receives setting information for enabling two default beam path losses for uplink (UL) transmission, and information indicating the UL transmission; and a control unit that, on the basis of whether the UL transmission is a transmission over a plurality of slots, determines at least one from among a default spatial relationship and a default path loss reference signal (PL-RS) to be applied to the UL transmission. According to one aspect of the present disclosure, it is possible to appropriately control operations relating to the default TCI state / spatial relationship / path loss reference signal.

Description

Technical Field

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

Background Art

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

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

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In future wireless communication systems (e.g., NR), it is being considered to set a physical downlink control channel (PDCCH) reception method with higher reliability and for high-speed movement for a control resource set (CORESET).

[0006] However, in a terminal (user equipment, UE), how to apply at least one of a default TCI state, a default spatial relation, and a default path loss reference signal has not been sufficiently studied. If such an operation is not clear, there is a risk of causing a decrease in communication quality, a decrease in throughput, etc.

[0007] Therefore, one object of the present disclosure is to provide a terminal and a wireless communication method that appropriately control operations related to the default TCI state / spatial relation / path loss reference signal 、 base station and system as one of the purposes.

Means for Solving the Problems

[0008] A terminal according to an aspect of the present disclosure includes a receiving unit that receives downlink control information (DCI) for scheduling an aperiodic channel state information reference signal (A-CSI-RS), and a value of a period from the reception of the DCI to the reception of the A-CSI-RS is smaller than a threshold value, in the case of using a single frequency network (SFN) scheme, when a higher layer parameter for activating two default transmission configuration indication (TCI) states is not set, and when there is another downlink signal in which a TCI state is indicated in a symbol for receiving the A-CSI-RS to , a control unit that applies a QCL assumption of the other downlink signal to the reception of the A-CSI-RS When transmitting UE capability information indicating support for the application to the and has system, the QCL assumption of the other downlink signal is applied to the reception of the A-CSI-RS. The other downlink signal is an A-CSI-RS scheduled using an offset of a second value or more when the terminal is provided with parameters related to beam switch timing and reports a first value as the threshold value. The first value is larger than the second value .

Effects of the Invention

[0009] According to one aspect of the present disclosure, operations related to the default TCI state / space relationship / path loss reference signal can be appropriately controlled.

Brief Description of the Drawings

[0010]

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DETAILED DESCRIPTION OF THE INVENTION

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

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

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

[0014] QCL is an indicator that shows the statistical properties of a signal / channel. For example, when a certain signal / channel and other signal / channels are in a QCL relationship, it may mean that at least one of Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same (QCL with respect to at least one of these) among these different multiple signals / channels.

[0015] Note that the spatial Rx parameter may correspond to the receiving beam of the UE (e.g., receiving analog beam), and the beam may be specified based on spatial QCL. QCL (or at least one element of QCL) in the present disclosure may be read as sQCL (spatial QCL).

[0016] Multiple types (QCL types) of QCL may be defined. For example, four QCL types A - D with different parameters (or parameter sets) that can be assumed to be the same may be provided, and the parameters (which may also be called QCL parameters) are shown as follows: · QCL type A (QCL - A): Doppler shift, Doppler spread, average delay, and delay spread, · QCL type B (QCL - B): Doppler shift and Doppler spread, · QCL type C (QCL - C): Doppler shift and average delay, · QCL type D (QCL - D): spatial Rx parameter.

[0017] It may be called a QCL assumption that a UE assumes that a certain control resource set (Control Resource Set (CORESET)), channel, or reference signal is in a relationship of a specific QCL (e.g., QCL type D) with another CORESET, channel, or reference signal.

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

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

[0020] The physical layer signaling may be, for example, downlink control information (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 physical downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a physical downlink control channel (Physical Downlink Control Channel (PDCCH)), a physical uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and a physical uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0022] In addition, the RS related to the channel and QCL 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 CSI-RS for tracking (also referred to as a Tracking Reference Signal (TRS)), and a reference signal for QCL detection (also referred to as QRS).

[0023] The 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). The SSB may be referred to as an SS / PBCH block.

[0024] The RS of QCL type X in the TCI state may mean an RS in the relationship of a certain channel / signal (DMRS thereof) and QCL type X, and this RS may also be referred to as the QCL source of QCL type X in the TCI state.

[0025] (Path loss RS) Path loss PL in the transmission power control of each of PUSCH, PUCCH, and SRS b,f,c (q d ) [dB] is the index q of a reference signal (RS, path loss reference RS) for the downlink BWP associated with the active UL BWP b of the carrier f of the serving cell c d calculated by the UE using. In the present disclosure, the path loss reference RS, pathloss (PL)-RS, and index q dThe RS used for path loss calculation, the RS resource used for path loss calculation, may be read interchangeably with each other. In the present disclosure, calculate, estimate, measure, track, may be read interchangeably with each other.

[0026] When the path loss RS is updated by the MAC CE, it is being considered whether to change the existing mechanism of the higher layer filtered RSRP for path loss measurement.

[0027] When the path loss RS is updated by the MAC CE, path loss measurement based on L1-RSRP may be applied. At the available timing after the MAC CE for updating the path loss RS, the higher layer filtered RSRP may be used for path loss measurement, and L1-RSRP may be used for path loss measurement before the higher layer filtered RSRP is applied. At the available timing after the MAC CE for updating the path loss RS, the higher layer filtered RSRP may be used for path loss measurement, and the higher layer filtered RSRP of the previous path loss RS may be used before that timing. Similar to the operation of Rel.15, the higher layer filtered RSRP may be used for path loss measurement, and the UE may track all the path loss RS candidates set by the RRC. The maximum number of path loss RSs that can be set by the RRC may depend on the UE capability. If the maximum number of path loss RSs that can be set by the RRC is X, path loss RS candidates less than or equal to X may be set by the RRC, and the path loss RS may be selected by the MAC CE from among the set path loss RS candidates. The maximum number of path loss RSs that can be set by the RRC may be 4, 8, 16, 64, etc.

[0028] In the present disclosure, the higher layer filtered RSRP, the filtered RSRP, the layer 3 filtered RSRP, may be read interchangeably with each other.

[0029] (Default TCI state / Default spatial relation / Default PL-RS) In Rel.16, the PDSCH may be scheduled by 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 up to 3 bits.

[0030] In RRC connected mode, if the first DCI inner TCI information element (higher layer parameter tci-PresentInDCI) for the CORESET that schedules the PDSCH is set to "enabled", the UE assumes that a TCI field exists in the DCI format 1_1 of the PDCCH transmitted in the CORESET.

[0031] Also, if the second DCI inner TCI information element (higher layer parameter tci-PresentInDCI-1-2) for the CORESET that schedules the PDSCH is set for the UE, the UE assumes that a TCI field having the DCI field size indicated by the second DCI inner TCI information element exists in the DCI format 1_2 of the PDSCH transmitted in the CORESET.

[0032] Also, in Rel.16, the PDSCH may be scheduled by DCI without a TCI field. The DCI format of the said 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 (higher layer parameter tci-PresentInDCI or tci-PresentInDCI-1-2) is not set (enabled). If the PDSCH is scheduled by DCI without a TCI field and 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 the said DCI) is greater than or equal to the threshold (timeDurationForQCL), the UE shall assume that the TCI state or QCL assumption for the PDSCH is the same as the TCI state or QCL assumption (default TCI state) of the CORESET (e.g., the scheduling DCI).

[0033] In RRC connected mode, in both the case where the TCI information element in the DCI (higher layer parameters tci-PresentInDCI and tci-PresentInDCI-1-2) is set to "enabled" and the case where the TCI information element in the DCI is not set, if the time offset between the reception of the DL DCI (the DCI that schedules the PDSCH) and the corresponding PDSCH (the PDSCH scheduled by the said DCI) is less than the threshold (timeDurationForQCL) (application condition, the first condition), and in the case of non-cross-carrier scheduling, the TCI state (default TCI state) of the PDSCH may be the TCI state of the lowest CORESET ID in the latest slot within the active DL BWP of the CC of that (specific UL signal). Otherwise, the TCI state (default TCI state) of the PDSCH may be the TCI state of the lowest TCI state ID of the PDSCH within the active DL BWP of the scheduled CC.

[0034] In Rel.15, individual MAC CEs for activation / deactivation of PUCCH spatial relations and for activation / deactivation of SRS spatial relations are required. The PUSCH spatial relation follows the SRS spatial relation.

[0035] In Rel.16, at least one of the MAC CE for activation / deactivation of PUCCH spatial relations and the MAC CE for activation / deactivation of SRS spatial relations may not be used.

[0036] If in FR2, neither the spatial relation for PUCCH nor the PL-RS is configured (application condition, second condition), the default assumptions for the spatial relation and PL-RS for PUCCH (default spatial relation and default PL-RS) are applied. If in FR2, neither the spatial relation for SRS (SRS resource for SRS, or SRS resource corresponding to the SRI in DCI format 0_1 that schedules PUSCH) nor the PL-RS is configured (application condition, second condition), the default assumptions for the spatial relation and PL-RS for the PUSCH and SRS scheduled by DCI format 0_1 (default spatial relation and default PL-RS) are applied.

[0037] If a CORESET is configured within the active DL BWP on that CC (application condition), the default spatial relation and default PL-RS may be the TCI state or QCL assumption of the CORESET having the lowest CORESET ID within the active DL BWP. If no CORESET is configured within the active DL BWP on that CC, the default spatial relation and default PL-RS may be the active TCI state having the lowest ID of the PDSCH within the active DL BWP.

[0038] In Rel.15, the spatial relation of the PUSCH scheduled by DCI format 0_0 follows the spatial relation of the PUCCH resource with the lowest PUCCH resource ID among the active spatial relations of the PUCCH on the same CC. Even when the PUCCH is not transmitted on the SCell, the network needs to update the PUCCH spatial relations on all SCell.

[0039] In Rel.16, no PUCCH configuration is required for the PUSCH scheduled by DCI format 0_0. For the PUSCH scheduled by DCI format 0_0, when there is no active PUCCH spatial relation or no PUCCH resource on the active UL BWP within its CC (application condition, the second condition), the default spatial relation and the default PL-RS are applied to the said PUSCH.

[0040] The application conditions for the default spatial relation / default PL-RS for SRS may include that the default beam path loss activation information element for SRS (upper layer parameter enableDefaultBeamPlForSRS) is set to be effective. The application conditions for the default spatial relation / default PL-RS for PUCCH may include that the default beam path loss activation information element for PUCCH (upper layer parameter enableDefaultBeamPlForPUCCH) is set to be effective. The application conditions for the default spatial relation / default PL-RS for the PUSCH scheduled by DCI format 0_0 may include that the default beam path loss activation information element for the PUSCH scheduled by DCI format 0_0 (upper layer parameter enableDefaultBeamPlForPUSCH0_0) is set to be effective.

[0041] In Rel.16, when a UE is configured with an RRC parameter (a parameter for enabling the default beam PL for PUCCH (enableDefaultBeamPL-ForPUCCH), a parameter for enabling the default beam PL for PUSCH (enableDefaultBeamPL-ForPUSCH0_0), or a parameter for enabling the default beam PL for SRS (enableDefaultBeamPL-ForSRS)), and no spatial relation or PL-RS is configured, the UE applies the default spatial relation / PL-RS.

[0042] The above threshold may be referred to as the 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", the schedule offset threshold, the scheduling offset threshold, etc. The above threshold may be reported by the UE as a UE capability (per subcarrier spacing).

[0043] The offset between the reception of DL DCI and the corresponding PDSCH is less than the threshold timeDurationForQCL, and at least one TCI state configured for the serving cell of the scheduled PDSCH includes "QCL type D", and the UE is configured with 2 default TCI activation information elements (enableTwoDefaultTCIStates-r16), and when at least one TCI code point (the code point of the TCI field in the DL DCI) indicates two TCI states, the UE is assumed to be quasi co-located (QCL) with the RS related to the QCL parameters of the two TCI states corresponding to the lowest code point among the two TCI states included in the TCI code point for which the DMRS ports of the PDSCH or PDSCH transmission occasion of the serving cell are associated (2 default QCL assumption determination rule). The 2 default TCI activation information element indicates that the Rel.16 operation of the two default TCI states for the PDSCH is enabled when at least one TCI code point is mapped to two TCI states.

[0044] As the default TCI states of PDSCH in Rel.15 / 16, the default TCI states for single TRP, the default TCI states for multi-TRP based on multi-DCI, and the default TCI states for multi-TRP based on single DCI are specified.

[0045] As the default TCI states of aperiodic CSI-RS (A(aperiodic)-CSI-RS) in Rel.15 / 16, the default TCI states for single TRP, the default TCI states for multi-TRP based on multi-DCI, and the default TCI states for multi-TRP based on single DCI are specified.

[0046] In Rel.15 / 16, the default spatial relationship and the default PL-RS for each of PUSCH / PUCCH / SRS are specified.

[0047] (Multi-TRP) In NR, it is being considered that one or more transmission / reception points (TRPs) (multi-TRP (MTRP)) perform DL transmission to a UE using one or more panels (multi-panel). Also, it is being considered that a UE performs UL transmission to one or more TRPs using one or more panels.

[0048] Note that the plurality of TRPs may correspond to the same cell identifier (cell ID) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0049] The multi-TRP (e.g., TRP#1, #2) is connected by an ideal / non-ideal backhaul, and information, data, etc. may be exchanged. Different codewords (CWs) and different layers may be transmitted from each TRP of the multi-TRP. As a form of multi-TRP transmission, Non-Coherent Joint Transmission (NCJT) may be used.

[0050] In NCJT, for example, TRP#1 modulates and maps the first codeword, layer-maps it to the first number of layers (e.g., 2 layers), and transmits the first PDSCH using the first precoding. Also, TRP#2 modulates and maps the second codeword, layer-maps it to the second number of layers (e.g., 2 layers), and transmits the second PDSCH using the second precoding.

[0051] Note that multiple PDSCHs (multi-PDSCH) to be NCJT may be defined to partially or completely overlap with respect to at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap with respect to at least one of the time and frequency resources.

[0052] These first PDSCH and second PDSCH may be assumed to be not quasi-co-located. Reception of multi-PDSCH may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0053] Multiple PDSCHs from multiple TRPs (which may be referred to as multi-PDSCH (multiple PDSCH)) 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 separately using multiple DCIs (multi-DCI, multiple PDCCH) (multi-master mode, multi-DCI based multi-TRP).

[0054] In Ultra-Reliable and Low Latency Communications (URLLC) for multi-TRP, it is being considered to support repetition of Physical Downlink Shared Channel (PDSCH) (transport block (TB) or codeword (CW)) across multi-TRP. Repetition schemes (URLLC scheme, reliability enhancement scheme, e.g., scheme 1a, 2a, 2b, 3, 4) across multi-TRP on the frequency domain or layer (spatial) domain or time domain are being considered to be supported. In scheme 1a, multi-PDSCH from multi-TRP is space division multiplexing (SDM). In schemes 2a and 2b, PDSCH from multi-TRP is frequency division multiplexing (FDM). In scheme 2a, the redundancy version (RV) for multi-TRP is the same. In scheme 2b, the RV for multi-TRP may be the same or different. In schemes 3 and 4, multi-PDSCH from multi-TRP is time division multiplexing (TDM). In scheme 3, multi-PDSCH from multi-TRP is transmitted within one slot. In scheme 4, multi-PDSCH from multi-TRP is transmitted in different slots.

[0055] According to such a multi-TRP scenario, more flexible transmission control using a good-quality channel is possible.

[0056] In order to support multi-TRP transmission within a cell (intra-cell, having the same cell ID) and between cells (inter-cell, having different cell IDs) based on multiple PDCCHs, in the RRC configuration information for linking multiple pairs of PDCCH and PDSCH having multiple TRPs, one control resource set (CORESET) within the PDCCH configuration information (PDCCH-Config) may correspond to one TRP.

[0057] If at least one of the following Conditions 1 and 2 is satisfied, the UE may determine that it is a multi-TRP based on multi-DCI. In this case, the TRP may be remapped to the CORESET pool index. [Condition 1] One CORESET pool index is configured. [Condition 2] Two different values (e.g., 0 and 1) of the CORESET pool index are configured.

[0058] If the following condition is satisfied, the UE may determine that it is a multi-TRP based on single-DCI. In this case, the two TRPs may be remapped to two TCI states indicated by 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 code point of the TCI field in DCI.

[0059] The common beam indication DCI 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 a UE-group common DCI format.

[0060] (Multi-TRP PDCCH) For the reliability of the multi-TRP PDCCH based on non-single frequency network (SFN), the following Considerations 1 to 3 are being considered. [Consideration 1] Channel 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.

[0061] The following Options 1-2, 1-3, 2, and 3 for PDCCH repetition are being considered.

[0062] [Option 1-2] Two sets of PDCCH candidates (within a given search space (SS) set) are respectively associated with two TCI states of a CORESET. Here, the same CORESET, the same SS set, and PDCCH repetition in different monitoring occasions are used.

[0063] [Option 1-3] Two sets of PDCCH candidates are respectively associated with two SS sets. Both SS sets are associated with a CORESET, and each SS set is associated with only one TCI state of its CORESET. Here, the same CORESET and two SS sets are used.

[0064] [Option 2] One SS set is associated with two different CORESETs.

[0065] [Option 3] Two SS sets are respectively associated with two CORESETs.

[0066] In this way, it is being considered that two PDCCH candidates within two SS sets for PDCCH repetition are supported and the two SS sets are explicitly linked.

[0067] (SFN PDCCH) For the PDCCH / CORESET defined in Rel.15, one TCI state without a CORESET pool index (which may be called TRP information (TRP Info)) is set for one CORESET.

[0068] For the enhancement of PDCCH / CORESET defined in Rel.16, in the case of multi-TRP based on multi-DCI, a CORESET pool index is set for each CORESET.

[0069] From Rel.17 onwards, the following enhancements 1 and 2 for PDCCH / CORESET are being considered.

[0070] In the case where multiple antennas (small antennas, transceiver points) with the same cell ID form a single frequency network (SFN), for one CORESET, up to two TCI states can be set / activated by upper layer signaling (RRC signaling / MAC CE) (enhancement 1). The SFN contributes to at least one of the operation and reliability improvement of high speed trains (HST).

[0071] Also, in the 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 the corresponding CORESET (Enhancement 2). The two search space sets may be associated with the same or different CORESETs. For one CORESET, one (at most one) TCI state can be set / activated by upper layer signaling (RRC signaling / MAC CE).

[0072] If two search space sets are associated with different CORESETs having different TCI states, it may mean repeated transmission of multi-TRP. If two search space sets are associated with the same CORESET (CORESET with the same TCI state), it may mean repeated transmission of single-TRP.

[0073] (HST) In LTE, it is difficult to arrange in the tunnel of HST (high speed train). The large antenna performs transmission outside / inside the tunnel. For example, the transmission power of the large antenna is about 1 to 5W. For handover, it is important for the UE to transmit outside the tunnel before entering the tunnel. For example, the transmission power of the small antenna is about 250mW. A plurality of small antennas (transmitting and receiving points) having the same cell ID and a distance of 300m form a single frequency network (SFN). All small antennas in the SFN transmit the same signal at the same time on the same PRB. It is assumed that the terminal transmits and receives to one base station. In fact, a plurality of transmitting and receiving points transmit the same DL signal. When moving at high speed, the transmitting and receiving points in the unit of several kilometers form one cell. Handover is performed when crossing cells. Thus, the handover frequency can be reduced.

[0074] In NR, in order to communicate with a terminal (hereinafter also referred to as UE) included in a moving body (HST (high speed train)) such as a train moving at high speed, it is assumed to use a beam transmitted from a transmission point (for example, RRH). In an existing system (for example, Rel. 15), it is supported to transmit a unidirectional beam from an RRH to communicate with a moving body (see FIG. 1A).

[0075] In FIG. 1A, it shows a case where RRHs are installed along the moving path (or moving direction, traveling direction, running path) of the moving body, and beams are formed from each RRH toward the traveling direction side of the moving body. The RRH that forms a unidirectional beam may be called a uni - directional RRH. In the example shown in FIG. 1A, the moving body receives a negative Doppler shift (-f D ) from each RRH.

[0076] Here, although it shows a case where a beam is formed toward the traveling direction side of the moving body, it is not limited to this, and a beam may be formed on the side opposite to the traveling direction, or beams may be formed in all directions regardless of the traveling direction of the moving body.

[0077] After Rel. 16, it is also assumed that a plurality (for example, two or more) of beams are transmitted from an RRH. For example, it is assumed to form beams in both the traveling direction of the moving body and the opposite direction (see FIG. 1B).

[0078] In FIG. 1B, it shows a case where RRHs are installed along the moving path of the moving body, and beams are formed from each RRH in both the traveling direction side and the opposite side of the traveling direction of the moving body. The RRH that forms beams in a plurality of directions (for example, two directions) may be called a bi - directional RRH.

[0079] In this HST, the UE communicates in the same way as a single TRP. In the base station implementation, it can transmit from a plurality of TRPs (with the same cell ID).

[0080] In the example of FIG. 1B, when two RRHs (here, RRH#1 and RRH#2) use an SFN, when the mobile body is in the middle of the two RRHs, the signal that receives a negative Doppler shift switches to a signal that receives a positive Doppler shift with higher power. In this case, the maximum change range of the Doppler shift that requires correction is from -f D to +f D and becomes twice that of the case of the unidirectional RRH.

[0081] Note that in the present disclosure, the positive Doppler shift may be read as information regarding the positive Doppler shift, the Doppler shift in the positive (forward) direction, or the Doppler information in the positive (forward) direction. Also, the negative Doppler shift may be read as information regarding the negative Doppler shift, the Doppler shift in the negative (backward) direction, or the Doppler information in the negative (backward) direction.

[0082] Here, as a scheme for the HST, the following schemes 0 to 2 (HST scheme 0 to HST scheme 2) are compared.

[0083] In scheme 0 of FIG. 2A, the tracking reference signal (TRS), the DMRS, and the PDSCH are transmitted in common (using the same time and the same frequency resources) to two TRPs (RRHs) (ordinary SFN, transparent SFN, HST-SFN).

[0084] In scheme 0, since the UE receives a DL channel / signal equivalent to a single TRP, the TCI state of the PDSCH is one.

[0085] Note that in Rel.16, RRC parameters for distinguishing between transmission using a single TRP and transmission using an SFN are defined. When the UE reports corresponding UE capability information, it may distinguish between receiving DL channels / signals of a single TRP and receiving a PDSCH assuming an SFN based on the RRC parameters. On the other hand, the UE may perform transmission and reception using an SFN assuming a single TRP.

[0086] In Scheme 1 of FIG. 2B, the TRS is transmitted specifically for each TRP (using different time / frequency resources for each TRP). In this example, TRS1 is transmitted from TRP#1 and TRS2 is transmitted from TRP#2.

[0087] In Scheme 1, since the UE receives DL channels / signals from each TRP using the TRS from each TRP, there are two TCI states for the PDSCH.

[0088] In Scheme 2 of FIG. 2C, the TRS and DMRS are transmitted specifically for each TRP. In this example, TRS1 and DMRS1 are transmitted from TRP#1, and TRS2 and DMRS2 are transmitted from TRP#2. Compared with Scheme 0, Schemes 1 and 2 can suppress rapid changes in Doppler shift and appropriately estimate / compensate for Doppler shift. Since the DMRS in Scheme 2 increases compared to the DMRS in Scheme 1, the maximum throughput of Scheme 2 is lower than that of Scheme 1.

[0089] In Scheme 0, the UE switches between a single TRP and an SFN based on upper layer signaling (RRC information element / MAC CE).

[0090] The UE may switch between Scheme 1 / Scheme 2 / NW pre-compensation scheme based on upper layer signaling (RRC information element / MAC CE).

[0091] In Scheme 1, two TRS resources are respectively set for the forward direction and the reverse direction of the HST.

[0092] In the example of FIG. 3A, the TRPs (TRP#0, #2, …) that transmit DL signals in the reverse direction of the HST transmit the first TRS (the TRS arriving from the front of the HST) in the resources (SFN) of the same time and frequency. The TRPs (TRP#1, #3, …) that transmit DL signals in the forward direction of the HST transmit the second TRS (the TRS arriving from the rear of the HST) in the resources (SFN) of the same time and frequency. The first TRS and the second TRS may be transmitted / received using different frequency resources.

[0093] 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.

[0094] 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 in the same time resources and different frequency resources, the resource utilization efficiency can be improved.

[0095] In the example of FIG. 4A, RRH#0-#7 are arranged along the movement path of the HST. RRH#0-#3 and RRH#4-#7 are respectively connected to baseband units (BBU) #0 and #1. Each RRH is a bidirectional RRH, and forms beams using each transmission / reception point (TRP) in both the forward direction and the reverse direction of the movement path.

[0096] In the received signal of the example of FIG. 4B (single TRP (SFN) / scheme 1), when the UE receives a signal / channel transmitted from TRP#2n−1 (n is an integer of 0 or more) (beam in the forward direction of HST, beam from behind the UE), a negative Doppler shift (in this example, -fD) occurs. Also, when the UE receives a signal / channel transmitted from TRP#2n (n is an integer of 0 or more) (beam in the reverse direction of the forward direction of HST, beam from in front of the UE), a positive Doppler shift (in this example, +fD) occurs.

[0097] From Rel. 17 onwards, it has been considered that the base station performs a Doppler pre-compensation scheme (Pre-Doppler Compensation scheme, Doppler pre-Compensation scheme, network (NW) pre-compensation scheme (NW pre-compensation scheme, HST NW pre-compensation scheme), TRP pre-compensation scheme, TRP-based pre-compensation scheme) in transmitting downlink (DL) signals / channels to the UE in the HST from the TRP. When transmitting a DL signal / channel to the UE, the TRP can reduce the influence of the Doppler shift at the time of receiving the DL signal / channel at the UE by performing Doppler compensation in advance. In the present disclosure, the Doppler pre-compensation scheme may be a combination of scheme 1 and pre-compensation of the Doppler shift by the base station.

[0098] In the Doppler pre-compensation scheme, it has been 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.

[0099] In the Doppler pre-compensation scheme, the TRP that forms a beam on the forward direction side of the movement path and the TRP that forms a beam on the side opposite to the forward direction of the movement path perform DL signal / channel transmission to the UE within the HST after performing Doppler correction. In this example, TRP#2n-1 performs positive Doppler correction, and TRP#2n performs negative Doppler correction to reduce the influence of the Doppler shift when the UE receives a signal / channel (Figure 4C).

[0100] Note that in the situation of Figure 4C, since the UE receives the DL channel / signal from each TRP using the TRS from each TRP, the number of TCI states for the PDSCH may be two.

[0101] Furthermore, since Rel.17, it has been considered to dynamically switch between a single TRP and an SFN using the TCI field (TCI state field). For example, using the RRC information element / MAC CE (e.g., Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE) / DCI (TCI field), one or two TCI states are set / indicated at each TCI code point (the code point of the TCI field, the DCI code point). When the UE is set / indicated with one TCI state, the UE may determine that it receives the PDSCH of a single TRP. Also, when the UE is set / indicated with two TCI states, the UE may determine that it receives the PDSCH of an SFN using multiple TRPs.

[0102] (Analysis) In most cases, the default beam (TCI state / spatial relationship) / default PL-RS in the SFN-PDCCH is derived from the TCI state of the PDCCH.

[0103] Regarding the SFN-PDCCH with two active TCI states, when deriving the TCI state from the CORESET with two active TCI states, the discussion on how to control the operations regarding the default beam (TCI state / spatial relation) / default PL-RS is not sufficient.

[0104] Note that for the SFN-PDCCH, both schemes 1 / 1a for HST and URLLC may be included. Also, for the SFN-PDCCH, Doppler pre-compensation may be applied only to HST.

[0105] In and after Rel.17, when the 2-default TCI state activation information element (enableTwoDefaultTCIStates) is set and the scheduling offset between DCI and PDSCH is smaller than the threshold (timeDurationForQCL), it is being considered that the default TCI state for PDSCH uses the above scheme 1a for PDSCH defined up to Rel.16.

[0106] Also, in and after Rel.17, when PDSCH is scheduled by a DCI that does not include a TCI field (e.g., DCI format 1_0 / 1_1 / 1_2) and the scheduling offset between DCI and PDSCH is equal to or greater than the threshold (timeDurationForQCL), it is being considered that, similar to Rel.15, the QCL of the scheduling CORESET is used for the default TCI state of PDSCH. In the case where two TCI states are set in the scheduling CORESET, it is being considered that both of those TCI states are used as the default TCI state. Also, in the case where that is not so, it is being considered that one TCI state is used.

[0107] Also, in the case where the 2-default TCI state activation information element (enableTwoDefaultTCIStates) is not configured after Rel. 17 and the scheduling offset between DCI and PDSCH is smaller than the threshold (timeDurationForQCL), the default TCI state for A-CSI-RS is considered to be one of the two TCI states corresponding to the lowest CORESET ID in the case where there are no other DL signals in the same symbol. In other cases, it is considered to follow the specifications defined up to Rel. 15 / 16.

[0108] Also, in the case where the 2-default TCI state activation information element (enableTwoDefaultTCIStates) is not configured after Rel. 17, for the default spatial relation / default PL-RS for UL transmission (PUSCH / PUCCH / SRS) for a single TRP, one TCI state corresponding to the lowest CORESET ID is considered to be selected as the default beam (TCI state / spatial relation) / default PL-RS.

[0109] The consideration status of the conditions of the 2-default TCI state activation information element (enableTwoDefaultTCIStates), the magnitude relationship between the scheduling offset and the threshold (timeDurationForQCL) is shown (Fig. 5). As shown in Fig. 5, the consideration regarding A-CSI-RS in the case where the 2-default TCI state activation information element (enableTwoDefaultTCIStates) is enabled and the scheduling offset is smaller than the threshold (timeDurationForQCL / beamSwitchTiming) is not sufficient.

[0110] Also, as shown in Fig. 5, the consideration regarding PDSCH in the case where the 2-default TCI state activation information element (enableTwoDefaultTCIStates) is disabled and the scheduling offset is smaller than the threshold (timeDurationForQCL) is not sufficient.

[0111] Before the UE completes decoding the DCI, it cannot recognize whether the PDSCH / A-CSI-RS is scheduled. Therefore, the UE needs to buffer the received channel / signal with a specific beam. Therefore, depending on the RRC configuration (enableTwoDefaultTCIStates), it is considered necessary to make the buffering operation the same between the PDSCH and the A-CSI-RS when receiving the channel / signal.

[0112] Also, when the UE derives two (default) TCI states for DL reception (e.g., PDSCH), there is insufficient consideration of how to apply / use these two default TCI states. Furthermore, there is also insufficient consideration of the application / use of the default spatial relationship / PL-RS.

[0113] If these considerations are insufficient, it is impossible to appropriately control the operation of the default TCI state for DL reception, appropriately apply these two default TCI states, and appropriately determine the default spatial relationship / PL-RS, which may lead to a degradation in communication quality, a decrease in throughput, etc.

[0114] Therefore, the inventors have conceived a method for appropriately controlling the operations related to the default TCI state / spatial relationship / PL-RS.

[0115] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to the respective embodiments may be applied individually or in combination.

[0116] In the present disclosure, "A / B / C", "at least one of A, B, and C" may be read interchangeably with each other. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, band may be read interchangeably with each other. In the present disclosure, index, ID, indicator, resource ID may be read interchangeably with each other. In the present disclosure, sequence, list, set, group, cluster, subset, etc. may be read interchangeably with each other. In the present disclosure, support, control, be able to control, operate, be able to operate may be read interchangeably with each other.

[0117] In the present disclosure, configure, activate, update, indicate, enable, specify, select may be read interchangeably with each other.

[0118] In the present disclosure, the upper layer signaling may be any one of, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameter, upper layer, upper layer parameter, RRC information element (IE), RRC message, configuration may be read interchangeably with each other.

[0119] MAC signaling may use, for example, MAC control element (MAC Control Element (MAC CE)), MAC Protocol Data Unit (PDU), etc. In the present disclosure, MAC CE, update command, activation / deactivation command may be read interchangeably with each other.

[0120] 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), or the like.

[0121] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameter, spatial domain reception filter, UE spatial domain reception filter, UE reception beam, DL beam, DL reception beam, DL precoding, DL precoder, DL-RS, RS of QCL type D for TCI state / QCL assumption, RS of QCL type A for TCI state / QCL assumption, spatial relationship, spatial domain transmission filter, UE spatial domain transmission filter, UE transmission beam, UL beam, UL transmission beam, UL precoding, UL precoder, PL-RS may be mutually interchangeable. 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, SRS may be mutually interchangeable.

[0122] In the present disclosure, panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmission entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relation, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), base station, antenna port of a signal (e.g., DeModulation Reference Signal (DMRS) port), DMRS, antenna port group of a signal (e.g., DMRS port group), group for multiplexing (e.g., 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, CORESET subset, downlink Transmission Configuration Indication state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumption, redundancy version (RV), layer (multi-input muti-output (MIMO) layer, transmission layer, spatial layer), may be read interchangeably with each other.Also, the panel Identifier (ID) and the panel may be interchangeable. In the present disclosure, the TRP ID and the TRP may be interchangeable with each other.

[0123] The panel may be related to at least one of the group index of the SSB / CSI-RS group, the group index of the group-based beam report, and the group index of the SSB / CSI-RS group for the group-based beam report.

[0124] Also, 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 with each other.

[0125] In the present disclosure, one of the TRP, the transmission point, the panel, the DMRS port group, the CORESET pool, and one of the two TCI states associated with one code point of the TCI field may be interchangeable with each other.

[0126] In the present disclosure, a single PDCCH (DCI) may be assumed to be supported when multi-TRP utilizes an ideal backhaul. Multi-PDCCH (DCI) may be assumed to be supported when non-ideal backhaul is utilized between multi-TRP.

[0127] Note that the ideal backhaul may be referred to as 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 referred to as 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.

[0128] In the present disclosure, single TRP, single TRP system, single TRP transmission, single PDSCH, may be read interchangeably with each other. In the present disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, multi-PDSCH, may be read interchangeably with each other. In the present disclosure, single DCI, single PDCCH, multi-TRP based on single DCI, activation of two TCI states on at least one TCI code point, may be read interchangeably with each other.

[0129] In the present disclosure, single TRP, a channel using single TRP, a channel using one TCI state / space relation, non-activation of multi-TRP by RRC / DCI, non-activation of multiple TCI states / space relations by RRC / DCI, not setting one CORESET pool index (CORESETPoolIndex) value for any CORESET, and no code point of the TCI field being mapped to two TCI states, may be read interchangeably with each other.

[0130] In the present disclosure, multi-TRP, a channel using multi-TRP, a channel using multiple TCI states / space relations, activation of multi-TRP by RRC / DCI, activation of multiple TCI states / space relations by RRC / DCI, at least one of multi-TRP based on single DCI and multi-TRP based on multi-DCI, may be read interchangeably with each other. In the present disclosure, multi-TRP based on multi-DCI, setting one CORESET pool index (CORESETPoolIndex) value for CORESET, may be read interchangeably with each other. In the present disclosure, multi-TRP based on single DCI, at least one code point of the TCI field being mapped to two TCI states, may be read interchangeably with each other.

[0131] In the present disclosure, TRP#1 (the first TRP) may correspond to CORESET pool index = 0, or may correspond to the first TCI state among two TCI states corresponding to one code point of the TCI field. TRP#2 (the second TRP) may correspond to CORESET pool index = 1, or may correspond to the second TCI state among two TCI states corresponding to one code point of the TCI field.

[0132] In the present disclosure, single DCI (sDCI), single PDCCH, a multi-TRP system based on single DCI, sDCI-based MTRP, activation of two TCI states on at least one TCI code point, may be read interchangeably with each other.

[0133] In the present disclosure, multi DCI (mDCI), multi PDCCH, a multi-TRP system based on multi DCI, mDCI-based MTRP, setting of two CORESET pool indexes or CORESET pool index = 1 (or one or more values), may be read interchangeably with each other.

[0134] The QCL of the present disclosure may be read interchangeably with QCL type D.

[0135] In the present disclosure, "TCI state A is the same QCL type D as TCI state B", "TCI state A is the same as TCI state B", "TCI state A is QCL type D with TCI state B", etc. may be read interchangeably with each other.

[0136] In the present disclosure, CSI-RS, NZP-CSI-RS, periodic (P)-CSI-RS, P-TRS, semi-persistent (SP)-CSI-RS, aperiodic (A)-CSI-RS, TRS, CSI-RS for tracking, CSI-RS having TRS information (upper layer parameter trs-Info), NZP CSI-RS resources within an NZP CSI-RS resource set having TRS information, NZP-CSI-RS resources within an NZP-CSI-RS resource set consisting of a plurality of NZP-CSI-RS resources of the same antenna port, and TRS resources may be read as each other. In the present disclosure, CSI-RS resources, CSI-RS resource sets, CSI-RS resource groups, and information elements (IEs) may be read as each other.

[0137] In the present disclosure, the code points of the DCI field 'Transmission Configuration Indication', TCI code points, DCI code points, and code points of the TCI field may be read as each other.

[0138] In the present disclosure, single TRP and SFN may be read as each other. In the present disclosure, HST, HST scheme, high-speed movement scheme, scheme 1, scheme 2, NW pre-compensation scheme, HST scheme 1, HST scheme 2, and HST NW pre-compensation scheme may be read as each other.

[0139] In the present disclosure, PDSCH / PDCCH using a single TRP may be read as PDSCH / PDCCH based on a single TRP, single TRP PDSCH / PDCCH. Also, in the present disclosure, PDSCH / PDCCH using SFN may be read as PDSCH / PDCCH using SFN in multi, PDSCH / PDCCH based on SFN, SFN PDSCH / PDCCH.

[0140] In the present disclosure, receiving a DL signal (PDSCH / PDCCH) using an SFN may mean receiving the same time / frequency resource and / or the same data (PDSCH) / control information (PDCCH) from a plurality of transceiver points. Also, receiving a DL signal using an SFN may mean receiving the same time / frequency resource and / or the same data / control information using a plurality of TCI states / spatial domain filters / beams / QCLs.

[0141] In the present disclosure, at least one of the HST-SFN scheme, an SFN scheme after Rel. 17, a new SFN scheme, a new HST-SFN scheme, an HST-SFN scenario after Rel. 17, an HST-SFN scheme for an HST-SFN scenario, an SFN scheme for an HST-SFN scenario, Scheme 1, a Doppler pre-compensation scheme, Scheme 1 (HST Scheme 1), and a Doppler pre-compensation scheme may be read as each other. In the present disclosure, the Doppler pre-compensation scheme, the base station pre-compensation scheme, the TRP pre-compensation scheme, the pre-Doppler compensation scheme, the Doppler pre-compensation scheme, the NW pre-compensation scheme, the HST NW pre-compensation scheme, the TRP pre-compensation scheme, the TRP-based pre-compensation scheme may be read as each other. In the present disclosure, the pre-compensation scheme, the reduction scheme, the improvement scheme, and the correction scheme may be read as each other.

[0142] In the present disclosure, a PDCCH / search space (SS) / CORESET having a linkage, a linked PDCCH / SS / CORESET, and a pair of PDCCH / SS / CORESET may be read as each other. In the present disclosure, a PDCCH / SS / CORESET having no linkage, an unlinked PDCCH / SS / CORESET, and a single PDCCH / SS / CORESET may be read as each other.

[0143] In the present disclosure, two linked CORESETs for PDCCH repetition and two CORESETs respectively associated with two linked SS sets may be readdressed to each other.

[0144] In the present disclosure, SFN-PDCCH repetition, PDCCH repetition, two linked PDCCHs, and one DCI being received across its two linked search spaces (SS) / CORESETs may be readdressed to each other.

[0145] In the present disclosure, PDCCH repetition, SFN-PDCCH repetition, PDCCH repetition for higher reliability, and two linked PDCCHs may be readdressed to each other.

[0146] In the present disclosure, the PDCCH reception method, PDCCH repetition, SFN-PDCCH repetition, HST-SFN, and HST-SFN scheme may be readdressed to each other.

[0147] In the present disclosure, the PDSCH reception method, single DCI-based multi-TRP, and HST-SFN scheme may be readdressed to each other.

[0148] In the present disclosure, the single DCI-based multi-TRP repetition may be NCJT for enhanced mobile broadband (eMBB) services (low priority, priority 0) or repetition for ultra-reliable and low latency communications services of URLLC services (high priority, priority 1).

[0149] In the present disclosure, the received DL channel / signal, DL channel / signal, DL reception, received signal, received channel, etc. may be read interchangeably with each other. Also, in the present disclosure, the UL channel / signal, transmission of UL channel / signal, UL transmission may be read interchangeably with each other. Also, in the present disclosure, a signal and a channel may be read interchangeably with each other. In the present disclosure, buffering and buffer may be read interchangeably with each other.

[0150] In the present disclosure, the first TCI state may mean at least one of the first TCI state, the TCI state with a small (or large) TCI state ID. Also, the second TCI state may mean at least one of the second TCI state, the TCI state with a large (or small) TCI state ID. In the present disclosure, the first TCI state and the second TCI state may be read interchangeably with each other.

[0151] In each embodiment of the present disclosure, two (default) TCI states / spatial relationships / PL-RSs are described as the main examples, but the number is not limited to two, and each embodiment is also applicable as appropriate to a number of (default) TCI states / spatial relationships / PL-RSs greater than two.

[0152] Also, in the present disclosure, two default TCI states / spatial relationships / PL-RSs may be read interchangeably with the two default TCI states / spatial relationships / PL-RSs.

[0153] In the present disclosure, small, few, short, low may be read interchangeably with each other. Also, in the present disclosure, ignore, drop, etc. may be read interchangeably with each other.

[0154] (Wireless communication method) <The first embodiment> 《Embodiment 1-1》 In Embodiment 1-1, a case will be described where the scheduling offset is smaller than a threshold value (for example, timeDurationForQCL / beamSwitchTiming), and two default TCI state activation information elements (enableTwoDefaultTCIStates) are configured / enabled.

[0155] In each embodiment of the present disclosure, the UE may report a first threshold value related to the PDSCH and a second threshold value related to the A-CSI-RS. The first threshold value and the second threshold value may be the same value or different values. The UE may control the application of the default TCI state for the PDSCH based on the first threshold value, and may control the application of the default TCI state for the A-CSI-RS based on the second threshold value.

[0156] The UE may buffer the received signal in the same manner as the determination of the TCI state defined in Rel. 16 PDSCH scheme 1a.

[0157] At this time, in the determination of the TCI state, the UE may determine the TCI state with the lowest TCI code point among the two active TCI states for the PDSCH in the scheduled BWP / CC.

[0158] Regarding the A-CSI-RS, when there is no other DL signal in the symbol identical to the symbol of the A-CSI-RS, the UE may determine the QCL of the A-CSI-RS as the first TCI state among the two active TCI states for the PDSCH corresponding to the lowest TCI code point in the scheduled BWP / CC. When there is one active TCI state for the PDSCH corresponding to the lowest TCI code point, the UE may determine that the one TCI state is the QCL of the A-CSI-RS.

[0159] In other words, when receiving A-CSI-RS, the UE may apply one TCI state out of two TCI states corresponding to the lowest code point among the TCI code points mapped to two TCI states, and which is applicable to the PDSCH within the active BWP of the cell receiving the CSI-RS.

[0160] FIGS. 6A and 6B are diagrams showing an example of application of a default beam according to Embodiment 1-1. In the example shown in FIG. 6A, the UE monitors CORESET#1 corresponding to TCI state #0 and CORESET#2 corresponding to TCI state #1 and TCI state #2. Also, as in the example shown in FIG. 6B, for the UE, the correspondence between the TCI code point and the TCI state for the active PDSCH TCI state is set. Two TCI states, TCI state #m and TCI state #n, correspond to the lowest TCI code point ("000").

[0161] During the period from the end of monitoring of CORESET#1 to the start of monitoring of CORESET#2, the UE applies a default beam (TCI state) for buffering the received signal. The UE determines that the default TCI states for the PDSCH during this period are TCI state #m and TCI state #n corresponding to the TCI code point "000". Also, the UE determines that the default TCI state for the A-CSI-RS during this period is TCI state #m, which is the first TCI state, corresponding to the TCI code point "000".

[0162] During a specific period from the end of monitoring of CORESET#2, the UE applies a default beam (TCI state) for buffering the received signal. The UE determines that the default TCI states for the PDSCH during this period are TCI state #m and TCI state #n corresponding to the TCI code point "000". Also, the UE determines that the default TCI state for the A-CSI-RS during this period is TCI state #m, which is the first TCI state, corresponding to the TCI code point "000".

[0163] "Embodiment 1-2" In Embodiment 1-2, a case where the scheduling offset is smaller than the threshold (timeDurationForQCL / beamSwitchTiming) and the two default TCI state activation information element (enableTwoDefaultTCIStates) is not configured will be described.

[0164] The UE may buffer the received DL channel / signal according to the QCL assumption of the lowest CORESET ID in the latest slot. If the CORESET corresponding to the CORESET ID has two TCI states, the UE may buffer the received signals of both TCI states.

[0165] Regarding A-CSI-RS, when there is no other DL signal in the symbol identical to the symbol of A-CSI-RS, the UE may determine the QCL of A-CSI-RS to be the same as the QCL assumption of the lowest CORESET ID in the latest slot in the same BWP as the active BWP of the serving cell (Embodiment 1-2-1). Otherwise (when there is another DL signal in the same symbol), the QCL of A-CSI-RS may be determined according to the existing specification (Rel.15).

[0166] In other words, when there is another DL signal with the TCI state indicated in the same symbol as CSI-RS, the UE may also apply the QCL assumption of the other DL signal when receiving A-CSI-RS.

[0167] The other DL signal may be a PDSCH scheduled using a scheduling offset greater than or equal to the threshold (timeDurationForQCL).

[0168] The other DL signal may be an A-CSI-RS that is scheduled using an offset greater than or equal to a value (e.g., 14 / 28 / 48) reported by the UE as a threshold (beamSwitchTiming) without a parameter (enableBeamSwitchTiming) related to beam switch timing being provided.

[0169] The other DL signal may be an A-CSI-RS that is scheduled using an offset greater than or equal to a second value (e.g., 48) when a parameter (enableBeamSwitchTiming) related to beam switch timing is provided and the UE reports a first value (e.g., 224 / 336) as a threshold (beamSwitchTiming-r16).

[0170] The other DL signal may be a P-CSI-RS / SP-CSI-RS.

[0171] If there is a PDSCH in the same symbol as the CSI-RS with two TCI states indicated, when receiving the A-CSI-RS, the UE may apply the first TCI state out of the two TCI states.

[0172] For the PDSCH, the UE may determine the QCL of the PDSCH to be the same as one or two QCL assumptions of the lowest CORESET ID in the latest slot in the same BWP as the active BWP of the serving cell (Embodiment 1-2-2).

[0173] If the lowest CORESET ID in the latest slot corresponds to one TCI state, the UE may use the one TCI state for receiving the PDSCH. Also, if the lowest CORESET ID in the latest slot corresponds to two TCI states, the UE may use the two TCI states for receiving the PDSCH.

[0174] FIG. 7 is a diagram showing an example of application of a default beam according to Embodiment 1-2. In the example shown in FIG. 7, the UE monitors CORESET #1 corresponding to TCI state #0 and CORESET #2 corresponding to TCI state #1 and TCI state #2.

[0175] The UE applies a default beam (TCI state) for buffering the received signal during the period from the end of monitoring of CORESET #1 to the start of monitoring of CORESET #2. The UE determines that the default TCI state for PDSCH during the period and the default TCI state for A-CSI-RS during the period are TCI state #0, which is the TCI state of CORESET (CORESET #1) in the latest slot.

[0176] The UE applies a default beam (TCI state) for buffering the received signal during a specific period from the end of monitoring of CORESET #2. The UE determines that the default TCI state for PDSCH during the period is TCI state #1 and TCI state #2, which are the TCI states of CORESET (CORESET #2) in the latest slot. Also, the UE determines that the default TCI state for A-CSI-RS during the period is TCI state #1, which is the first TCI state among TCI state #1 and TCI state #2, which are the TCI states of CORESET (CORESET #2) in the latest slot.

[0177] [Variation of Embodiment 1-2] The UE may buffer the received DL channel / signal according to the QCL / TCI state (the first TCI state) of the QCL assumption of the lowest CORESET ID in the latest slot. If the CORESET with the CORESET ID has two TCI states, the UE may buffer the received signal of the first TCI state among the two TCI states.

[0178] Regarding the PDSCH, the UE may determine the QCL of the PDSCH to be the QCL assumption of one of the lowest CORESET IDs in the latest slot in the same BWP as the active BWP of the serving cell.

[0179] When the lowest CORESET ID in the latest slot corresponds to one TCI state, the UE may use the one TCI state for receiving the PDSCH. Also, when the lowest CORESET ID in the latest slot corresponds to two TCI states, the UE may use the first TCI state among the two TCI states for receiving the PDSCH.

[0180] FIG. 8 is a diagram showing an example of application of a default beam according to a variation of Embodiment 1-2. In the example shown in FIG. 8, the UE monitors CORESET #1 corresponding to TCI state #0 and CORESET #2 corresponding to TCI state #1 and TCI state #2.

[0181] The UE applies a default beam (TCI state) for buffering the received signal during the period from the end of monitoring of CORESET #1 to the start of monitoring of CORESET #2. The UE determines that the default TCI state for the PDSCH during the period and the default TCI state for the A-CSI-RS during the period are TCI state #0, which is the TCI state of the CORESET (CORESET #1) in the latest slot.

[0182] The UE applies the default beam (TCI state) for buffering the received signal within a specific period from the end of monitoring CORESET#2. The UE determines that the default TCI state during this period is the first TCI state, i.e., TCI state #1, among TCI state #1 and TCI state #2, which are the TCI states of the CORESET (CORESET#2) in the latest slot. That is, the UE determines that the default TCI state for PDSCH and the default TCI state for A-CSI-RS during this period are the first TCI state, i.e., TCI state #1, among TCI state #1 and TCI state #2, which are the TCI states of the CORESET (CORESET#2) in the latest slot.

[0183] In this embodiment, in the case where the two-default-TCI-state activation information element (enableTwoDefaultTCIStates) is not set / is invalid, the UE can buffer the received signal using only one QCL assumption, and the increase in UE complexity can be suppressed.

[0184] Also, when the two-default-TCI-state activation information element (enableTwoDefaultTCIStates) is not set / is invalid, the UE does not have to assume / expect that the PDSCH is scheduled using a scheduling offset smaller than the threshold (timeDurationForQCL).

[0185] According to the first embodiment above, even when the scheduling offset is smaller than the threshold, it is possible to appropriately determine the default TCI state applied to DL reception.

[0186] <Second Embodiment> The QCL assumption of the PDSCH may be both of the two QCL / TCI states of the scheduling CORESET within the same BWP as the active BWP of the serving cell.

[0187] In other words, the UE may determine that the QCL assumption for the PDSCH is both of the two QCL / TCI states of the scheduling CORESET within the same BWP as the active BWP of the serving cell.

[0188] At this time, for example, non-cross-carrier scheduling may be applied.

[0189] When the scheduling offset is smaller than the threshold (timeDurationForQCL), the first embodiment described above may be applied regardless of the presence or absence of the TCI field.

[0190] According to the second embodiment, it is not necessary to switch / distinguish the buffering operation depending on the presence or absence of the TCI field, and an increase in the complexity of the UE can be suppressed.

[0191] <The Third Embodiment> 《Embodiment 3-1》 Based on the previous studies and the above first and second embodiments, the UE can derive two TCI states for the PDSCH. Hereinafter, the application / usage method of the two default TCI states will be described.

[0192] When the PDSCH in the SFN scheme (scheme 1 / TRP-based pre-compensation scheme) is configured, the PDSCH may be applied in the two default spatial relationships / PL-RS in the SFN scheme. When the PDSCH in the SFN scheme (scheme 1 / TRP-based pre-compensation scheme) is configured, the UE may determine that the PDSCH is applied in the two default spatial relationships / PL-RS in the SFN scheme.

[0193] The UE may apply / use the first / second TCI states of the default TCI state as the first / second TCI indicated for the PDSCH (using DCI), respectively.

[0194] In the TRP-based pre-compensation scheme, the UE may ignore one or more QCL parameters of the second TCI state. For example, the QCL parameter may be dropped from the second TCI state of the indicated TCI code point including two TCI states.

[0195] In the TRP-based pre-compensation scheme, when the same DMRS port is associated with two TCI states, the following Variants A and B may be supported as QCL type / QCL assumption: Variant A: One TCI state is associated with {average delay, delay spread}, and another TCI state is associated with {average delay, delay spread, Doppler shift, Doppler spread} (for example, QCL type A). Variant B: One TCI state is associated with {average delay, delay spread}, and another TCI state is associated with {Doppler shift, Doppler spread} (for example, QCL type B).

[0196] In Variant A of the TRP-based pre-compensation scheme, the UE may set / indicate / associate two TCI states for the PDSCH.

[0197] Of the two TCI states, the first TCI state may be QCL type A and QCL type D (if applicable), and the second TCI state may be QCL type A and QCL type D (if applicable).

[0198] The UE may ignore specific QCL parameters (for example, Doppler shift / Doppler spread) from the QCL type A RS of the second TCI state.

[0199] Also, in Variation B of the TRP-based pre-compensation scheme, the UE may be configured / indicated / associated with two TCI states for the PDSCH.

[0200] Of the two TCI states, the first TCI state may be QCL type B and QCL type D (if applicable), and the second TCI state may be QCL type A and QCL type D (if applicable).

[0201] The UE may ignore specific QCL parameters (e.g., Doppler shift / Doppler spread) from the QCL type A RS of the second TCI state.

[0202] Also, in Variation B of the TRP-based pre-compensation scheme, the UE may be configured / indicated / associated with two TCI states for the PDSCH.

[0203] Of the two TCI states, the first TCI state may be QCL type A and QCL type D (if applicable), and the second TCI state may be QCL type A and QCL type D (if applicable).

[0204] The UE may ignore a first specific QCL parameter (e.g., average delay / delay spread) from the QCL type A RS of the first TCI state and ignore a second specific QCL parameter (e.g., Doppler shift / Doppler spread) from the QCL type A RS of the second TCI state.

[0205] FIG. 9 is a diagram showing an example related to QCL parameters according to Embodiment 3-1. In the example shown in FIG. 9, the UE has Variation A of the TRP-based pre-compensation scheme configured.

[0206] In the example shown in FIG. 9, for the first TCI state, QCL type A and QCL type D are configured, and for the second TCI state, QCL type A and QCL type D are configured. At this time, the UE ignores the Doppler shift parameter and the Doppler spread parameter from the QCL type A RS in the second TCI state.

[0207] When the PDSCH of variation B in the TRP-based pre-compensation scheme is configured, the UE may expect / assume at least one configuration for identifying the DMRS for the PDSCH. The UE may expect / assume such a configuration when reporting UE capability information that supports variation B in the TRP-based pre-compensation scheme.

[0208] The specific condition may be at least one of Settings 1 to 3 described below.

[0209] For the QCL type indicated by the TCI state, the UE may expect / assume that the type B of the CSI-RS resource of the NZP-CSI-RS resource set (NZP-CSI-RS-ResourceSet) set by the TRS information (trs-Info) of the higher layer parameter and (if applicable) the type D of the same CSI-RS resource are configured (Setting 1).

[0210] For the QCL type indicated by the TCI state, the UE may expect / assume that the type B of the CSI-RS resource of the NZP-CSI-RS resource set (NZP-CSI-RS-ResourceSet) set by the TRS information (trs-Info) of the higher layer parameter and (if applicable) the type D of the CSI-RS resource of the NZP-CSI-RS resource set (NZP-CSI-RS-ResourceSet) set by the information (repeition) regarding the repeated transmission of the higher layer parameter are configured (Setting 2).

[0211] The UE may expect / assume that for the QCL type indicated by the TCI state, the type B of the CSI-RS resources of the NZP-CSI-RS-ResourceSet set without the TRS information (trs-Info) of the upper layer parameters and the information regarding repeated transmission (repeition), and (if applicable) the type D of the same CSI-RS resources, are set (Configuration 3).

[0212] Note that when the QCL type B and the QCL type D (if applicable) are included in the TCI state, in at least one of the above Configurations 1 to 3, the restriction of "the same CSI-RS resource" may be removed.

[0213] <<Embodiment 3-2>> In Embodiment 3-2, similar to Embodiment 3-1, the application / usage method of the two default TCI states will be described.

[0214] When the PDSCH for the repeated transmission of multi-TRP is configured, the UE may receive the multi-slot PDSCH using two TCI states derived from the default QCL of the PDSCH. For the repeated transmission of multi-TRP, SDM / TDM / FDM may be used.

[0215] The mapping of the first / second TCI states for each PDSCH of the multiple PDSCHs for which SDM / TDM / FDM is used may follow the method defined up to Rel.16.

[0216] When the PDSCH of the SFN scheme (Scheme 1) is configured, the UE may receive the PDSCH in the SFN (SFN-PDSCH) using two TCI states derived from the default QCL of the PDSCH.

[0217] According to the above Embodiment 3, it is possible to appropriately control the two default TCI states.

[0218] <Embodiment 4> The application of default spatial relationship / PL-RS will be described below.

[0219] When the CORESET related to the default spatial relationship / PL-RS has two TCI states, the UE may apply / use the first TCI state among the two TCI states as the default spatial relationship / PL-RS.

[0220] When new RRC parameters are configured / enabled for the UE and the spatial relationship / PL-RS is not configured, the UE may apply two default spatial relationships / PL-RS to the transmission of UL channels / signals (e.g., PUSCH / PUCCH / SRS).

[0221] The new RRC parameter may be at least one of, for example, a parameter (enableTwoDefaultBeamPL-ForPUCCH) for enabling two default beam PLs for PUCCH, a parameter (enableTwoDefaultBeamPL-ForPUSCH0_0) for enabling two default beam PLs for PUSCH, and a parameter (enableTwoDefaultBeamPL-ForSRS) for enabling two default beam PLs for SRS.

[0222] The UE may determine the TCI state corresponding to the default spatial relationship / PL-RS based on whether the UL channel / signal (e.g., PUSCH / PUCCH / SRS) is transmitted over a plurality of slots. The UE may determine the number (e.g., 1 or 2) of the TCI states corresponding to the default spatial relationship / PL-RS based on whether the UL channel / signal is transmitted over a plurality of slots.

[0223] UL transmission (e.g., PUSCH / PUCCH / SRS) across multiple slots may be reinterpreted as at least one of repetition, intra-slot repetition, inter-slot repetition, repetition for multi-TRP, intra-slot repetition for multi-TRP, inter-slot repetition for multi-TRP, UL transmission by configured grant, UL transmission by semi-persistent scheduling.

[0224] For example, the UE may determine the number of TCI states corresponding to the default spatial relation / PL-RS based on whether the UL channel / signal (e.g., PUSCH / PUCCH / SRS) is repetition (e.g., repetition for multi-TRP).

[0225] For example, when the repetition of multi-TRP PUSCH / PUCCH is configured for the UE, the UE may assume two default spatial relations / PL-RS for the PUSCH / PUCCH.

[0226] For example, when the repetition of multi-TRP PUSCH / PUCCH is not configured for the UE, the UE may assume one default spatial relation / PL-RS for the PUSCH / PUCCH. The one default spatial relation / PL-RS may correspond to the first TCI state among the two TCI states corresponding to the lowest CORESET ID. When there is one TCI state corresponding to the lowest CORESET ID, the UE may determine that the one TCI state corresponds to one default spatial relation / PL-RS.

[0227] For example, when the spatial relation / PL-RS derived from the default spatial relation / PL-RS is used for the transmission of SRS, the UE may assume one default spatial relation / PL-RS for the SRS. The one default spatial relation / PL-RS may correspond to the first TCI state among the two TCI states corresponding to the lowest CORESET ID. When there is one TCI state corresponding to the lowest CORESET ID, the UE may determine that the one TCI state corresponds to one default spatial relation / PL-RS.

[0228] For example, when the spatial relation / PL-RS derived from the default spatial relation / PL-RS is used for the transmission of SRS, for the PUSCH scheduled by a DCI (e.g., DCI format 0_1 / 0_2) including the SRS resource indicator (SRI) field associated with the SRS, the UE may assume one default spatial relation / PL-RS for the PUSCH. The one default spatial relation / PL-RS may correspond to the first TCI state among the two TCI states corresponding to the lowest CORESET ID. When there is one TCI state corresponding to the lowest CORESET ID, the UE may determine that the one TCI state corresponds to one default spatial relation / PL-RS.

[0229] For example, when the spatial relation / PL-RS derived from the default spatial relation / PL-RS is used for the transmission of SRS, for the PUSCH scheduled by a DCI including the SRI field associated with the SRS, if the PUSCH is a repeated transmission for multiple TRPs, the UE may assume two default spatial relations / PL-RS for the PUSCH. The two default spatial relations / PL-RS may correspond to the two TCI states corresponding to the lowest CORESET ID.

[0230] The above "repeated transmission" / "repeated transmission for multi-TRP" may be mutually read as simultaneous UL transmission, UL simultaneous transmission of different channels / signals, UL transmission using TDM / FDM / SDM, etc.

[0231] FIGS. 10A and 10B are diagrams showing an example of a default spatial relationship / PL-RS according to the fourth embodiment. FIG. 10A shows a case where the UL transmission performed by the UE is not a transmission over a plurality of slots. At this time, the UE may determine that one default spatial relationship / PL-RS corresponds to the first TCI state (in the example of FIG. 10A, TCI state #1) among the two TCI states corresponding to the lowest CORESET ID.

[0232] Further, FIG. 10B shows a case where the UL transmission performed by the UE is a transmission over a plurality of slots. At this time, the UE may determine that two default spatial relationships / PL-RS correspond to the two TCI states (in the example of FIG. 10B, TCI state #1 and TCI state #2) corresponding to the lowest CORESET ID.

[0233] According to the fourth embodiment above, it becomes possible to appropriately apply the default spatial relationship / PL-RS.

[0234] <Fifth Embodiment> Higher layer parameters (RRC IE) / UE capabilities corresponding to the functions (features) in at least one of the above-described plurality of embodiments may be defined. The UE capabilities may indicate that it supports this function.

[0235] A UE in which a higher layer parameter corresponding to that function (enabling that function) is set may perform that function. It may be defined that "a UE in which a higher layer parameter corresponding to that function is not set does not perform that function (for example, in accordance with Rel.15 / 16)".

[0236] A UE that has reported UE capabilities indicating support for the function may perform the function. It may be specified that "a UE that has not reported UE capabilities indicating support for the function shall not perform the function (e.g., in accordance with Rel. 15 / 16)".

[0237] If a UE has reported UE capabilities indicating support for the function and the upper layer parameters corresponding to the function are configured, the UE may perform the function. It may be specified that "if a UE has not reported UE capabilities indicating support for the function or the upper layer parameters corresponding to the function are not configured, the UE shall not perform the function (e.g., in accordance with Rel. 15 / 16)".

[0238] UE capabilities may indicate whether the UE supports this function.

[0239] The function may be the application of default TCI states / spatial relations / PL-RSs.

[0240] The function may be the application of one or two default TCI states / spatial relations / PL-RSs.

[0241] UE capabilities may be defined by whether the UE supports a CORESET with two TCI states.

[0242] UE capabilities may be defined by whether the UE supports default TCI states / spatial relations / PL-RSs for PDSCH / A-CSI-RS / PUCCH / PUSCH / SRS in cases where a CORESET with two TCI states is configured.

[0243] UE capabilities may be defined by whether the UE supports one or two default TCI states / spatial relations / PL-RSs for PDSCH / A-CSI-RS / PUCCH / PUSCH / SRS in cases where a CORESET with two TCI states is configured.

[0244] The UE capability may be defined based on whether it supports the HST scheme described in the third embodiment. The HST scheme may be a TRP-based pre-compensation scheme.

[0245] The UE capability may be defined based on whether it supports at least one setting for specifying the DMRS for PDSCH described in the third embodiment.

[0246] The UE capability may be defined based on whether it supports the application of two (or more) default spatial relationships / PL-RSs.

[0247] According to the fifth embodiment above, the UE can implement the above functions while maintaining compatibility with existing specifications.

[0248] (Wireless communication system) Hereinafter, the configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present disclosure.

[0249] FIG. 11 is a diagram showing an example of the 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) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0250] In addition, the wireless communication system 1 may support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0251] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0252] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, NR-NR Dual Connectivity (NN-DC) where both the MN and the SN are base stations (gNBs) of NR).

[0253] The wireless communication system 1 may include a base station 11 that forms a relatively wide-coverage macro cell C1, and a base station 12 (12a - 12c) that is disposed within the macro cell C1 and forms a smaller small cell C2 than the macro cell C1. The user terminal 20 may be located within at least one cell. The arrangement and number of each cell and the user terminal 20 are not limited to the modes shown in the figures. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0254] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) and dual connectivity (DC) using a plurality of component carriers (CCs).

[0255] 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, definitions, etc. of FR1 and FR2 are not limited to these. For example, FR1 may correspond to a frequency band higher than FR2.

[0256] Also, the user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0257] The plurality of base stations 10 may be connected by wire (e.g., an optical fiber compliant with 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 base stations 11 and 12, the base station 11 corresponding to the upper-level 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.

[0258] The base station 10 may be connected to the core network 30 via another base station 10 or directly. The core network 30 may include at least one of, for example, Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0259] The user terminal 20 may be a terminal corresponding to at least one of communication systems such as LTE, LTE-A, 5G, etc.

[0260] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access method may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0261] The wireless access method may be referred to as a waveform. Note that in the wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0262] In the wireless communication system 1, as downlink channels, a Physical Downlink Shared Channel (PDSCH) shared by each user terminal 20, a Physical Broadcast Channel (PBCH), a Physical Downlink Control Channel (PDCCH), etc. may be used.

[0263] Also, in the wireless communication system 1, as uplink channels, a Physical Uplink Shared Channel (PUSCH) shared by each user terminal 20, a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), etc. may be used.

[0264] User data, upper layer control information, a System Information Block (SIB), etc. are transmitted by the PDSCH. User data, upper layer control information, etc. may be transmitted by the PUSCH. Also, a Master Information Block (MIB) may be transmitted by the PBCH.

[0265] 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 of at least one of the PDSCH and the PUSCH.

[0266] Note that the DCI for scheduling the PDSCH may be called DL assignment, DL DCI, etc., and the DCI for scheduling the PUSCH may be called UL grant, UL DCI, etc. Note that the PDSCH may be read as DL data, and the PUSCH may be read as UL data.

[0267] For PDCCH detection, a control resource set (CORESET) and a search space may be used. The CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and 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.

[0268] 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 "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. in the present disclosure may be read interchangeably with each other.

[0269] Uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (for example, may be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) may be transmitted by PUCCH. A random access preamble for connection establishment with the cell may be transmitted by PRACH.

[0270] Note that in the present disclosure, the downlink, uplink, etc. may be expressed without adding "link". Also, the "Physical" may be omitted at the beginning of various channels.

[0271] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may be transmitted.

[0272] The synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, an SS Block (SSB), etc. Note that SS, SSB, etc. may also be called reference signals.

[0273] Also, in the wireless communication system 1, as the uplink reference signal (Uplink Reference Signal (UL-RS)), a sounding reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may be transmitted. Note that DMRS may also be called a UE-specific reference signal.

[0274] (Base station) FIG. 12 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may be provided.

[0275] In this example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

[0276] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0277] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission / reception, measurement, etc., using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may generate data, control information, a sequence, etc., to be transmitted as a signal, and transfer it to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of a communication channel, state management of the base station 10, management of radio resources, etc.

[0278] The transmission / reception 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 transmission / reception unit 120 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0279] The transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122. The reception unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0280] The transmission / reception antenna 130 can be composed of an antenna described based on the common understanding in the technical field related to the present disclosure, such as an array antenna.

[0281] The transmission / reception unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 120 may receive the above-described uplink channel, uplink reference signal, etc.

[0282] The transmission / reception unit 120 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0283] The transmission / reception unit 120 (transmission processing unit 1211) may perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 110, and generate a bit sequence to be transmitted.

[0284] The transmission / reception unit 120 (transmission processing unit 1211) may perform transmission processing such as channel encoding (which may include error correction encoding), 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 sequence to be transmitted, and output a baseband signal.

[0285] The transmission / reception unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0286] On the other hand, the transmission / reception unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmission / reception antenna 130.

[0287] The transmission / reception unit 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 on the acquired baseband signal, and acquire user data, etc.

[0288] The transmission / reception unit 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.

[0289] The transmission path interface 140 may transmit and receive signals (backhaul signaling) with devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0290] Note that the transmission unit and reception unit of the base station 10 in the present disclosure may be configured by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0291] The transmitting / receiving unit 120 may transmit a first downlink control information (DCI) for scheduling a physical downlink shared channel (PDSCH), or a second DCI for scheduling an aperiodic channel state information reference signal (A-CSI-RS). When the value of the period from the reception of the first DCI to the reception of the PDSCH is smaller than a first threshold and no upper layer parameter for activating two default transmission configuration indication (TCI) states is set, the control unit 110 may control the transmission of the PDSCH to which the first default TCI state is applied. When the value of the period from the reception of the second DCI to the reception of the A-CSI-RS is smaller than a second threshold and the upper layer parameter is set, the control unit 110 may control the transmission of the A-CSI-RS to which the second default TCI state is applied (First - Third Embodiments).

[0292] The transmitting / receiving unit 120 may transmit configuration information for activating two default beam path losses for uplink (UL) transmission and information for instructing the UL transmission. The control unit 110 may determine at least one of a default spatial relation and a default path loss reference signal (PL-RS) for the UL transmission, which is applied based on whether the UL transmission is a transmission over a plurality of slots (Fourth Embodiment).

[0293] (User Equipment) FIG. 13 is a diagram showing an example of the configuration of a user equipment according to an embodiment. The user equipment 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided respectively.

[0294] In this example, mainly the functional blocks of the characteristic parts in this embodiment are shown, and it may be assumed that the user equipment 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

[0295] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc., which are described based on the common understanding in the technical field related to the present disclosure.

[0296] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission, reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transmission / reception unit 220.

[0297] The transmission / reception 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 transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common understanding in the technical field related to the present disclosure.

[0298] The transmission / reception unit 220 may be configured as an integrated transmission / reception unit or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of the transmission processing unit 2211 and the RF unit 222. The reception unit may be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0299] The transmission / reception antenna 230 can be composed of an antenna described based on the common understanding in the technical field related to the present disclosure, such as an array antenna.

[0300] The transmission / reception unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0301] The transmission / reception unit 220 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0302] The transmission / reception unit 220 (transmission processing unit 2211) may perform processing of the PDCP layer, processing of the RLC layer (e.g., RLC retransmission control), processing of the MAC layer (e.g., HARQ retransmission control), etc. on data, control information, etc. acquired from the control unit 210, for example, and generate a bit sequence to be transmitted.

[0303] The transmission / reception 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, digital-to-analog conversion, etc. on the bit sequence to be transmitted, and output a baseband signal.

[0304] Whether to apply DFT processing may be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is enabled, the transmission / reception unit 220 (transmission processing unit 2211) may perform DFT processing as the above-described transmission processing in order to transmit the channel using the DFT-s-OFDM waveform, or may not perform DFT processing as the above-described transmission processing if not.

[0305] The transmission / reception unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0306] On the other hand, the transmission / reception unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmission / reception antenna 230.

[0307] The transmission / reception unit 220 (reception processing unit 2212) may perform 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 on the acquired baseband signal, and may acquire user data and the like.

[0308] The transmission / reception unit 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), reception 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.

[0309] Note that the transmission unit and reception unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0310] The transmission / reception unit 220 may receive the first downlink control information (DCI) for scheduling the physical downlink shared channel (PDSCH), or the second DCI for scheduling the aperiodic channel state information reference signal (A-CSI-RS). When the value of the period from the reception of the first DCI to the reception of the PDSCH is smaller than the first threshold and the upper layer parameter for activating two default transmission configuration indication (TCI) states is not set, the control unit 210 may determine the default TCI state to be applied to the PDSCH. When the value of the period from the reception of the second DCI to the reception of the A-CSI-RS is smaller than the second threshold and the upper layer parameter is set, the control unit 210 may determine the default TCI state to be applied to the A-CSI-RS (First - Third Embodiments).

[0311] When there is no other downlink signal in the symbol that receives the A-CSI-RS, the control unit 210 may determine that the default TCI state applied to the A-CSI-RS is the first TCI state corresponding to the lowest TCI code point among the active TCI states for the PDSCH (First Embodiment).

[0312] When there is no other downlink signal in the symbol that receives the A-CSI-RS, the control unit 210 may determine that the default TCI state applied to the A-CSI-RS is the first TCI state corresponding to the QCL assumption of the lowest control resource set ID in the latest slot within the same bandwidth part as the active bandwidth part of the serving cell (First Embodiment).

[0313] The control unit 210 may determine that the default TCI state applied to the PDSCH is the TCI state corresponding to the QCL assumption of the lowest control resource set ID in the latest slot within the same bandwidth part as the active bandwidth part of the serving cell (First Embodiment).

[0314] The transceiver unit 220 may receive configuration information for enabling two default beam path losses for uplink (UL) transmission and information for instructing the UL transmission. The control unit 210 may determine at least one of the default spatial relation and the default path loss reference signal (PL-RS) applied to the UL transmission based on whether the UL transmission is a transmission over a plurality of slots (Fourth Embodiment).

[0315] The transmission over a plurality of slots may be a repeated transmission for a plurality of transmission and reception points (Fourth Embodiment).

[0316] When the UL transmission is not a transmission over a plurality of slots, the control unit 210 may determine that at least one of the number of the default spatial relationship and the number of the default PL-RS is one. When the UL transmission is a transmission over a plurality of slots, the control unit 210 may determine that at least one of the number of the default spatial relationship and the number of the default PL-RS is two (the fourth embodiment).

[0317] When determining that at least one of the number of the default spatial relationship and the number of the default PL-RS is one, the control unit 210 may determine that the default spatial relationship and the default PL-RS use the first TCI state among the transmission configuration indication (TCI) states corresponding to the lowest control resource set ID (the fourth embodiment).

[0318] (Hardware Configuration) Note that the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (for example, using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0319] Here, functions include, but are not limited to, judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection determination, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), assigning, etc. For example, a functional block (component) that enables transmission may be referred to as a transmitting unit, a transmitter, etc. In any case, as described above, the implementation method is not particularly limited.

[0320] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 14 is a diagram showing 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 physically be 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.

[0321] Note that in the present disclosure, terms such as device, circuit, device, section, unit, etc. can be read interchangeably with each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0322] For example, although only one processor 1001 is shown in the figure, there may be a plurality of processors. Also, the processing may be executed by one processor, or the processing may be executed by two or more processors simultaneously, sequentially, or using other methods. Note that the processor 1001 may be implemented by one or more chips.

[0323] Each function in the base station 10 and the user terminal 20 is realized, for example, by causing a predetermined software (program) to be loaded onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communication via a communication device 1004, or controls at least one of reading and writing data in the memory 1002 and a storage 1003.

[0324] The processor 1001 controls the entire computer by operating, for example, an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, at least a part of the above-described control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0325] Further, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program for causing a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and the same may be true for other functional blocks.

[0326] The memory 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), a software module, etc. executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0327] The storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (e.g., a compact disc (Compact Disc ROM (CD-ROM), etc.), a digital versatile disc, a Blu-ray (registered trademark) 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, and other suitable storage media. The storage 1003 may be referred to as an auxiliary storage device.

[0328] The communication device 1004 is hardware (a transceiver device) for performing communication 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, a communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-described transceiver unit 120 (220), the transceiver antenna 130 (230), etc. may be implemented by the communication device 1004. The transceiver unit 120 (220) may be physically or logically separated into a transmitter unit 120a (220a) and a receiver unit 120b (220b).

[0329] The input device 1005 is an input device that receives external input (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that performs output to the outside (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.). Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

[0330] Also, 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 for each device.

[0331] In addition, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA), and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0332] (Modification example) Regarding the terms described in the present disclosure and the terms necessary for understanding the present disclosure, they may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be read interchangeably with each other. Also, a signal may be a message. A reference signal may also be abbreviated as RS and may be called a Pilot, a pilot signal, etc. depending on the applied standard. Also, a Component Carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, etc.

[0333] 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 the radio frame may be called a subframe. Further, a subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) that does not depend on numerology.

[0334] Here, the new numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The new numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the time domain, etc.

[0335] A slot may be composed of one or more symbols (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. Also, a slot may be a time unit based on the new numerology.

[0336] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. The PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot may be called PDSCH (PUSCH) mapping type B.

[0337] A radio frame, sub-frame, slot, mini-slot, and symbol all represent time units for signal transmission. For a radio frame, sub-frame, slot, mini-slot, and symbol, other corresponding names may be used. Note that the time units such as frame, sub-frame, slot, mini-slot, and symbol in this disclosure may be read interchangeably with each other.

[0338] For example, one sub-frame may be called a TTI, or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be the sub-frame (1 ms) in the existing LTE, or may be a period shorter than 1 ms (for example, 1 - 13 symbols), or may be a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc. instead of a sub-frame.

[0339] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, the base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each user terminal) to each user terminal in TTI units. Note that the definition of the TTI is not limited to this.

[0340] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), code block, codeword, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when the TTI is given, the time interval (for example, the number of symbols) in which the transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0341] In addition, when one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (number of mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0342] A TTI having a time length of 1 ms may be commonly called a normal TTI (TTI in 3GPP Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0343] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of a long TTI and not less than 1 ms.

[0344] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in an RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0345] Also, an RB may include one or a plurality of symbols in the time domain, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. One TTI, one subframe, etc. may each be constituted by one or a plurality of resource blocks.

[0346] 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.

[0347] Also, a resource block may be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 sub-carrier and 1 symbol.

[0348] A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0349] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be set within one carrier for a UE.

[0350] At least one of the set BWPs may be active, and it may not be assumed that the UE transmits and receives a predetermined signal / channel outside the active BWP. Note that in the present disclosure, "cell", "carrier", etc. may be read as "BWP".

[0351] Note that the structures such as the above-described radio frames, subframes, slots, minislots, and symbols 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, and the number of symbols, symbol length, cyclic prefix (CP) length, etc. within a TTI can be variously changed.

[0352] Also, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or corresponding other information. For example, a radio resource may be indicated by a predetermined index.

[0353] The names used for parameters, etc. in the present disclosure are not limiting names in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (such as PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any way.

[0354] The information, signals, etc. described in the present disclosure may be represented using any of various 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 voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0355] Also, information, signals, etc. may be output from at least one of the upper layer to the lower layer and from the lower layer to the upper layer. Information, signals, etc. may be input and output via a plurality of network nodes.

[0356] The input / output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. The information, signals, etc. to be input / output may be overwritten, updated, or appended. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

[0357] The notification of information is not limited to the modes / 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 implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or combinations thereof.

[0358] Note that the physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Also, the RRC signaling may also be referred to as an RRC message and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. Further, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0359] Also, the notification of predetermined information (e.g., the notification of "being X") is not limited to an explicit notification and may be performed implicitly (e.g., by not performing the notification of the predetermined information or by the notification of another piece of information).

[0360] The determination may be made based on a value represented by 1 bit (either 0 or 1), a boolean value represented by true or false, or a numerical comparison (e.g., comparison with a predetermined value).

[0361] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

[0362] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0363] The terms "system" and "network" used in this disclosure may be used interchangeably. "Network" may mean the devices (e.g., base stations) included in the network.

[0364] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. can be used interchangeably.

[0365] 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. can be used interchangeably. The base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0366] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each of the smaller areas can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base station and the base station subsystem that provides communication services in this coverage.

[0367] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0368] A mobile station may also be called a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term.

[0369] At least one of the base station and the mobile station may be called a transmission device, a reception device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may also be a device mounted on a moving object, the moving object itself, etc.

[0370] The mobile object refers to an object that can move, and its moving speed is arbitrary, including the case where the mobile object is stationary. The mobile object includes, for example, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, shovel cars, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, rear cars, rickshaws, ships (ship and other watercraft), airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon, and is not limited thereto. Further, the mobile object may be a mobile object that autonomously travels based on an operation command.

[0371] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), a mobile object that moves without a driver (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (a manned or unmanned type). Note that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0372] FIG. 15 is a diagram showing an example of a vehicle according to an embodiment. As shown in FIG. 15, the vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0373] The drive unit 41 is composed of, for example, at least one of an engine, a motor, and a hybrid of an engine and a motor. 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 an operation of the steering wheel operated by a user.

[0374] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may be called an Electronic Control Unit (ECU).

[0375] Examples of signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotational speed signal of the front wheels 46 / rear wheels 47 acquired by a rotational speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 acquired by an air pressure sensor 52, a vehicle speed signal acquired by a vehicle speed sensor 53, an acceleration signal acquired by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 acquired by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 acquired by a brake pedal sensor 56, an operation signal of the shift lever 45 acquired by a shift lever sensor 57, a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 58, and the like.

[0376] The information service unit 59 is composed of various devices for providing various information such as driving information, traffic information, and entertainment information, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, and one or more ECUs for controlling these devices. The information service unit 59 provides various information / services (for example, multimedia information / multimedia services) to the passengers of the vehicle 40 by using the information acquired from an external device via a communication module 60 or the like.

[0377] The driving assistance system unit 64 is composed of various devices for providing functions to prevent accidents or reduce the driver's driving load, such as a millimeter-wave radar, Light Detection and Ranging (LiDAR), a camera, a positioning locator (e.g., Global Navigation Satellite System (GNSS), etc.), map information (e.g., High Definition (HD) map, Autonomous Vehicle (AV) map, etc.), a gyro system (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS), etc.), an Artificial Intelligence (AI) chip, an AI processor, and one or more ECUs for controlling these devices. Further, the driving assistance system unit 64 transmits and receives various information via the communication module 60 to realize a driving assistance function or an autonomous driving function.

[0378] The communication module 60 can communicate with the microprocessor 61 and the 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 the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the microprocessor 61 and the memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50 - 58 provided in the vehicle 40.

[0379] 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 types of information via wireless communication with the external device. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the above-described base station 10, user terminal 20, etc. Also, the communication module 60 may be, for example, the above-described base station 10, user terminal 20, etc. (and may function as the base station 10, user terminal 20, etc.).

[0380] The communication module 60 may transmit, via wireless communication, the signals from the various sensors 50 - 58 described above input to the electronic control unit 49 and the information obtained based on these signals to an external device.

[0381] The communication module 60 receives various types of information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 provided in the vehicle. Also, the communication module 60 stores the various types of information received from the external device in the memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 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, axle 48, various sensors 50 - 58, etc. provided in the vehicle 40.

[0382] In addition, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between the base station and the user terminal is replaced by communication between a plurality of user terminals (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described base station 10 may be configured as functions of the user terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to inter-terminal communication (for example, "sidelink"). For example, an uplink channel, a downlink channel, etc. may be replaced with a sidelink channel.

[0383] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described user terminal 20 may be configured as functions of the base station 10.

[0384] In the present disclosure, operations assumed to be performed by the base station may, in some cases, be performed by its upper node. In a network including one or more network nodes having a base station, it is obvious that various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME), Serving-Gateway (S-GW), etc., but not limited thereto), or a combination thereof.

[0385] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, for the method described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0386] Each aspect / embodiment described in the present disclosure may be applied to a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable wireless communication methods, and next-generation systems extended, modified, created, or defined based on these. Further, a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G) may be applied.

[0387] The description "based on" used in the present disclosure does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0388] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These terms can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed or that the first element must precede the second element in any form.

[0389] The term "determining" as used in this disclosure may encompass a wide variety of operations. For example, "determining" may be considered to be "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up, search, inquiry" (e.g., searching in a table, database, or another data structure), "ascertaining", etc.

[0390] Also, "determining" may be considered to be "receiving" (e.g., receiving information), "transmitting" (e.g., transmitting information), "input", "output", "accessing" (e.g., accessing data in a memory), etc.

[0391] Also, "determining" may be considered to be "resolving", "selecting", "choosing", "establishing", "comparing", etc. That is, "determining" may be considered to be "determining" any operation.

[0392] Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

[0393] The "maximum transmit power" described in this disclosure may mean the maximum value of the transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

[0394] As used in this disclosure, the terms "connected", "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements 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 "accessed".

[0395] In this disclosure, when two elements are connected, they can be considered to be "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and also, as some non-limiting and non-exhaustive examples, using electromagnetic energy having wavelengths in the radio frequency region, microwave region, optical (both visible and invisible) region, etc.

[0396] In this disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separate", "coupled", etc. may also be interpreted in the same way as "different".

[0397] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is intended not to be an exclusive disjunction.

[0398] In the present disclosure, for example, when articles are added by translation, such as a, an and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0399] As described above, the invention according to the present disclosure has been described in detail. However, it is obvious 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 as modified and changed embodiments without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not bring any limiting meaning to the invention according to the present disclosure.

Claims

1. A receiving unit that receives downlink control information (DCI) for scheduling an aperiodic channel state information reference signal (A-CSI-RS); When the value of the period from the reception of the DCI to the reception of the A-CSI-RS is smaller than a threshold value and the single frequency network (SFN) scheme is used, and when upper layer parameters for activating two default transmission configuration indication (TCI) states are not set, and when there is another downlink signal with a TCI state indicated in the symbol for receiving the A-CSI-RS, a control unit that applies the QCL assumption of the other downlink signal to the reception of the A-CSI-RS when UE capability information indicating support for applying the QCL assumption of the other downlink signal to the reception of the A-CSI-RS is transmitted; The other downlink signal is an A-CSI-RS scheduled using an offset of a second value or more when the terminal is provided with parameters related to beam switch timing and reports a first value as the threshold value, and the first value is larger than the second value, a terminal.

2. A step of receiving downlink control information (DCI) for scheduling an aperiodic channel state information reference signal (A-CSI-RS); When the value of the period from the reception of the DCI to the reception of the A-CSI-RS is smaller than a threshold value and the single frequency network (SFN) scheme is used, and when upper layer parameters for activating two default transmission configuration indication (TCI) states are not set, and when there is another downlink signal with a TCI state indicated in the symbol for receiving the A-CSI-RS, a step of applying the QCL assumption of the other downlink signal to the reception of the A-CSI-RS when UE capability information indicating support for applying the QCL assumption of the other downlink signal to the reception of the A-CSI-RS is transmitted; The other downlink signal is an A-CSI-RS scheduled using an offset of a second value or more when the terminal is provided with parameters related to beam switch timing and reports a first value as the threshold value, and the first value is larger than the second value, a wireless communication method of a terminal.

3. A transmitting unit that transmits downlink control information (DCI) for scheduling an aperiodic channel state information reference signal (A-CSI-RS); When the value of the period from the reception of the DCI to the reception of the A-CSI-RS is smaller than a threshold value, in the case of using a single frequency network (SFN) scheme, and when upper layer parameters for enabling two default transmission configuration indication (TCI) states are not set, and when there is another downlink signal with a TCI state indicated in the symbol for receiving the A-CSI-RS, when receiving UE capability information indicating support for applying the QCL assumption of the other downlink signal to the reception of the A-CSI-RS, a control unit that controls the transmission of the A-CSI-RS to which the QCL assumption of the other downlink signal is applied; The other downlink signal is an A-CSI-RS scheduled using an offset of a second value or more when the terminal is provided with parameters related to beam switch timing and reports a first value as the threshold value, and the first value is larger than the second value, a base station.

4. A system having a terminal and a base station, The terminal includes a receiving unit that receives downlink control information (DCI) for scheduling an aperiodic channel state information reference signal (A-CSI-RS); When the value of the period from the reception of the DCI to the reception of the A-CSI-RS is smaller than a threshold value, in the case of using a single frequency network (SFN) scheme, and when upper layer parameters for enabling two default transmission configuration indication (TCI) states are not set, and when there is another downlink signal with a TCI state indicated in the symbol for receiving the A-CSI-RS, when transmitting UE capability information indicating support for applying the QCL assumption of the other downlink signal to the reception of the A-CSI-RS, a control unit that applies the QCL assumption of the other downlink signal to the reception of the A-CSI-RS; The other downlink signal is an A-CSI-RS scheduled using an offset of a second value or more when the terminal is provided with parameters related to beam switch timing and reports a first value as the threshold value, and the first value is larger than the second value. The base station includes a transmission unit that transmits the DCI, and a control unit that controls transmission of the A-CSI-RS to which the QCL assumption is applied.

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