Terminal, wireless communication method, and base station

Abstract

A terminal according to an aspect of the present disclosure includes: a control unit that determines a transmission control indication state (TCI state) for the A-CSI-RS based on at least one of the indicated transmission control indication states (TCI states) for the downlink signal and two default TCI states for the physical downlink shared channel when there is another downlink signal in the same symbol as the aperiodic channel state information reference signal (A-CSI-RS) and the scheduling offset of the A-CSI-RS is less than a threshold; and a receiving unit that receives the A-CSI-RS using the determined TCI state. According to an aspect of the present disclosure, the A-CSI-RS can be appropriately measured.

Description

Technical Field

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

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

[0003] Research is also underway on a successor system to LTE (for example, also referred to as the 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.).

[0004] Prior Art Documents

[0005] Non-Patent Documents

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

[0007] Problems to be Solved by the Invention

[0008] In future wireless communication systems (e.g., NR), research is being conducted on controlling transmission and reception processing by a user terminal (terminal, user terminal, User Equipment (UE)) based on information regarding Quasi-Co-Location (QCL). In addition, research is being conducted on multiple transmission points transmitting downlink (DL) signals.

[0009] However, in the case of receiving DL signals from multiple transmission points, the measurement method of the aperiodic channel state information reference signal (A-CSI-RS) is not clear. If the A-CSI-RS is not properly measured, there is a concern about degradation of system performance such as throughput reduction.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can properly measure the A-CSI-RS.

[0011] Means for Solving the Problem

[0012] A terminal according to one embodiment of the present disclosure includes: a control unit that determines a transmission control indication (TCI) state for the A-CSI-RS based on at least one of the TCI state indicated for the downlink signal and two default TCI states for the physical downlink shared channel when there is another downlink signal in the same symbol as the aperiodic channel state information reference signal (A-CSI-RS) and the scheduling offset of the A-CSI-RS is less than a threshold; and a receiving unit that receives the A-CSI-RS using the determined TCI state.

[0013] Advantageous Effects of the Invention

[0014] According to one embodiment of the present disclosure, the A-CSI-RS can be properly measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a diagram showing an example of UE operation according to a second embodiment.

[0016] Figure 2 It is a diagram showing an example of the schematic configuration of a wireless communication system according to one embodiment.

[0017] Figure 3 It is a diagram showing an example of the configuration of a base station according to one embodiment.

[0018] Figure 4 It is a diagram showing an example of the configuration of a user terminal according to one embodiment.

[0019] Figure 5This is a diagram showing an example of the hardware structures of a base station and a user terminal according to an embodiment. Detailed Embodiment

[0020] (TCI, Spatial Relationship, QCL)

[0021] In NR, research is being conducted on UE's 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 that controls at least one of a signal and a channel (which can also be expressed as a signal / channel) based on a transmission configuration indication state (TCI state).

[0022] The TCI state can also represent an element of a signal / channel applied to the downlink. An element corresponding to the TCI state of a signal / channel applied to the uplink can also be expressed as a spatial relation.

[0023] The TCI state refers to information related to the quasi-co-location (QCL) of a signal / channel, and can also be referred to as a spatial reception parameter, spatial relation information, etc. The TCI state can also be set for the UE for each channel or each signal.

[0024] QCL refers to an index representing the statistical properties of a signal / channel. For example, when a certain signal / channel has a QCL relationship with other signal / channels, it can also mean that it can be assumed that at least one of Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same among these different multiple signal / channels (at least one of these is QCL).

[0025] In addition, regarding the spatial reception parameter, it can correspond to the reception beam of the UE (e.g., reception analog beam), or the beam can be determined based on spatial QCL. The QCL (or at least one element of QCL) in the present disclosure can also be replaced by sQCL (spatial QCL).

[0026] The QCL can also be specified with multiple types (QCL types). For example, four different QCL types A - D that can be assumed to have the same parameters (or parameter sets) can be set. The following shows these parameters (which can also be called QCL parameters):

[0027] · QCL type A (QCL - A): Doppler shift, Doppler spread, mean delay, and delay spread,

[0028] · QCL type B (QCL - B): Doppler shift and Doppler spread,

[0029] · QCL type C (QCL - C): Doppler shift and mean delay,

[0030] · QCL type D (QCL - D): Spatial reception parameter.

[0031] When the UE assumes that a certain control resource set (Control Resource Set (CORESET)), channel, or reference signal is in a specific QCL (e.g., QCL type D) relationship with other CORESETs, channels, or reference signals, it can also be called a QCL assumption (QCL assumption).

[0032] The UE can also determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0033] The TCI state can also be, for example, information related to the QCL between the channel being targeted (in other words, the reference signal (Reference Signal (RS)) used for this channel) and other signals (e.g., other RS). The TCI state can also be set (indicated) by higher - layer signaling, physical - layer signaling, or a combination of them.

[0034] The physical - layer signaling can also be, for example, downlink control information (Downlink Control Information (DCI)).

[0035] Channels configured (specified) with TCI states or spatial relations may also be at least one of, for example, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0036] In addition, the RS in a QCL relationship with this channel may also be at least one of, for example, a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), a reference signal for measurement (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 a QRS).

[0037] An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a broadcast channel (Physical Broadcast Channel (PBCH)). An SSB may also be referred to as an SS / PBCH block.

[0038] The RS of QCL type X in a TCI state may also mean an RS in a QCL type X relationship with a certain channel / signal (its DMRS), and this RS may also be referred to as the QCL source of QCL type X in this TCI state.

[0039] (Path loss RS)

[0040] Path loss PL in the transmit power control of each of PUSCH, PUCCH, and SRS b，f，c (q d) [dB] is calculated using the index q of the reference signal (RS, Pathloss Reference RS) for the downlink BWP associated with the activated UL BWP b of carrier f of serving cell c. d In the present disclosure, the Pathloss Reference RS, pathloss (PL)-RS, index q d , the RS for pathloss calculation, and the RS resource for pathloss calculation may also be replaced with each other. In the present disclosure, calculate, estimate, measure, and track may also be replaced with each other.

[0041] Research is being conducted on whether to change the existing structure of the higher layer filtered RSRP for pathloss measurement when the pathloss RS is updated by the MAC CE.

[0042] When the pathloss RS is updated by the MAC CE, pathloss measurement based on L1-RSRP may also be applied. At the available timing after the MAC CE for pathloss RS update, the higher layer filtered RSRP is used for pathloss measurement, and L1-RSRP may also be used for pathloss measurement before the higher layer filtered RSRP is applied. At the available timing after the MAC CE for pathloss RS update, the higher layer filtered RSRP is used for pathloss measurement, and before this timing, the higher layer filtered RSRP of the previous pathloss RS may also be used. Similar to the operation of Rel.15, the higher layer filtered RSRP is used for pathloss measurement, and the UE may also track all pathloss RS candidates set by the RRC. The maximum number of pathloss RSs that can be set by the RRC may also depend on the UE capability. When the maximum number of pathloss RSs that can be set by the RRC is X, X or fewer pathloss RS candidates are set by the RRC, and the pathloss RS may also be selected from the set pathloss RS candidates by the MAC CE. The maximum number of pathloss RSs that can be set by the RRC may also be 4, 8, 16, 64, etc.

[0043] In the present disclosure, the higher layer filtered RSRP, the filtered RSRP, and the layer 3 filtered RSRP may also be replaced with each other.

[0044] (Default TCI state / Default spatial relation / Default PL-RS)

[0045] In the RRC connected mode, in both the case where the TCI information (higher layer parameter TCI-PresentInDCI) in the DCI is set to "enabled", and the case where the TCI information in the DCI is not set, when the time offset between the reception of the DL DCI (the DCI scheduling the PDSCH) and the corresponding PDSCH (the PDSCH scheduled by this DCI) is less than the threshold (timeDurationForQCL) (application condition, first condition), in the case of non-cross-carrier scheduling, the TCI state of the PDSCH (default TCI state) can also be the TCI state of the lowest CORESET ID in the latest time slot within the activated DL BWP of this (specific UL signal) CC. In the case where it is not like that, the TCI state of the PDSCH (default TCI state) can also be the TCI state of the lowest TCI state ID of the PDSCH within the activated DL BWP of the scheduled CC.

[0046] In Rel.15, each MAC CE for activating / deactivating the PUCCH spatial relation and the MAC CE for activating / deactivating the SRS spatial relation are necessary. The PUSCH spatial relation follows the SRS spatial relation.

[0047] In Rel.16, at least one of the MAC CE for activating / deactivating the PUCCH spatial relation and the MAC CE for activating / deactivating the SRS spatial relation may not be used.

[0048] In FR2, in the case where both the spatial relation and the PL-RS for the PUCCH are not set (application condition, second condition), the default assumptions for the spatial relation and the PL-RS (default spatial relation and default PL-RS) are applied to the PUCCH. In FR2, in the case where both the spatial relation and the PL-RS for the SRS (the SRS resource for the SRS, or the SRS resource corresponding to the SRI in the DCI format 0_1 scheduling the PUSCH) are not set (application condition, second condition), for the PUSCH and SRS scheduled by the DCI format 0_1, the default assumptions for the spatial relation and the PL-RS (default spatial relation and default PL-RS) are applied.

[0049] In the case where no CORESET is configured within the activated DL BWP on this CC, the default spatial relation and the default PL-RS may also be the TCI state or QCL assumption of the CORESET with the lowest CORESET ID within this activated DL BWP. In the case where no CORESET is configured within the activated DL BWP on this CC, the default spatial relation and the default PL-RS may also be the activated TCI state with the lowest ID of the PDSCH within this activated DL BWP.

[0050] 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 activated spatial relations of the PUCCH on the same CC. Even when no PUCCH is transmitted on the SCell, it is necessary for the network to update the PUCCH spatial relations on all SCells.

[0051] In Rel.16, PUCCH configuration for the PUSCH scheduled by DCI format 0_0 is unnecessary. For the PUSCH scheduled by DCI format 0_0, when there is no activated PUCCH spatial relation or no PUCCH resource on the activated UL BWP within this CC (application condition, second condition), the default spatial relation and the default PL-RS are applied to this PUSCH.

[0052] The above threshold may also 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", scheduling offset threshold, scheduling offset threshold, etc.

[0053] (DL reception beam management)

[0054] The UE can also be configured with more than one TCI state on the serving cell. The UE completes the activation of the TCI state switching within the latency time. When the activated TCI state is updated by means of a MAC CE, when the updated TCI state (target TCI state) is applied (the length of the latency time) depends on whether the target TCI state is known (known, measured). When the target TCI is unknown (unknown, unmeasured), the UE can also apply the target TCI state after the time when the target TCI becomes known.

[0055] In the following cases where multiple TCI states are satisfied with known conditions (known conditions for TCI state, conditions for the TCI state to be regarded as known), the target TCI state is known.

[0056] · During the period from the last transmission of the RS resource used in the L1-RSRP measurement report for the target TCI state to the completion of the activation of the TCI state switching (TCI switching period), the RS resource for L1-RSRP measurement is the RS within the target TCI state or the RS QCL with the target TCI state.

[0057] · During the TCI switching period, the TCI state switching command is received within 1280 ms from the last transmission of the RS resource used for the report or measurement of the beam.

[0058] · During the TCI switching period, before the TCI state switching command, the UE has sent at least one L1-RSRP report for the target TCI state.

[0059] · During the TCI switching period, the target TCI state is in a detectable state.

[0060] · During the TCI switching period, the SSB associated with the target TCI state is in a detectable state.

[0061] · During the TCI switching period, the signal-to-noise ratio (SNR) of the target TCI state is -3 dB or more.

[0062] In the case where multiple TCI states are not satisfied with the known conditions, the target TCI state is unknown.

[0063] When the target TCI state is known, based on the reception of the PDSCH of the MAC CE activation command in transmission time slot n, the UE can receive in time slot n+T HARQ+(3ms + TO k *(T first-SSB + T SSB-proc )) / NR slot length, the PDCCH of the serving cell that had a TCI state transition before and has the target TCI state. The UE can receive the PDCCH in slot n + T HARQ +(3ms + TO k *(T first-SSB )) / NR slot length, the PDCCH with the old (pre-update) TCI state until then.

[0064] Here, T HARQ is the time between DL data transmission and positive acknowledgement. T first-SSB is the time from when the MAC CE command is decoded by the UE until the first SSC transmission. T SSB-proc is 2ms. TO k is 1 if the target TCI state is not in the active TCI state list for PDSCH, and 0 otherwise.

[0065] When the target TCI state is unknown, based on the reception of the PDSCH of the MAC CE activation command in transmission slot n, the UE can receive the PDCCH of the serving cell that had a TCI state transition before and has the target TCI state in slot n + T HARQ +(3ms + T L1-RSRP + TO uk *(T first-SSB + T SSB-proc )) / NR slot length. The UE can receive the PDCCH with the old (pre-update) TCI state until slot n + T HARQ +(3ms + T L1-RSRP + TO uk *(T first-SSB )) / NR slot length.

[0066] Here, T L1-RSRP is the time for L1 - RSRP measurement to improve the receiving beam. For SSB, T L1-RSRP is based on the L1 - RSRP measurement period T Report of the SSB when M = 1 and T L1-RSRP_Measurement_Period_SSB = 0. For CSI - RS, T L1-RSRP is based on the L1 - RSRP measurement period T L1-RSRP_Measurement_Period_CSI-RS of the CSI - RS, which is for periodic CSI - RS and aperiodic CSI - RS when the number of resources in the resource set is at least equal to MaxNumberRxBeam. When M = 1 and T ReportCSI-RS in the case of = 0. TO uk For CSI-RS based L1-RSRP measurement it is 1, and for SSB based L1-RSRP measurement in the case where the TCI state transition includes QCL type D it is 0. Additionally, TO uk it is 1 in the case where the TCI state transition includes other QCL types. In the case where the TCI state transition only includes QCL type A, QCL type B, or QCL type C, for SSB in FR2, T L1-RSRP_Measurement_Period_SSB = 0, and for T in FR2 L1-RSRP_Measurement_Period_CSI-RS = 0. In the case where the TCI state transition includes QCL type D, T first-SSB is the time until the first SSB measurement after the L1-RSRP measurement. For other ALC types, T first-SSB is the time until the first SSC transmission after the MAC CE command is decoded by the UE. For the target TCI state, the SSB is QCL type A or QCL type C.

[0067] The handover timing for handover to the target TCI state in the case where the target TCI state is unknown can also be the handover timing for handover to the target TCI state in the case where the target TCI state is known with T L1-RSRP added timing.

[0068] (Multi-TRP)

[0069] In NR, it is being studied that one or more Transmission / Reception Points (TRP) (multi-TRP (MTRP)) use one or more panels (multi-panel) to perform DL transmission to the UE. Additionally, it is being studied that the UE uses one or more panels to perform UL transmission to one or more TRP.

[0070] Furthermore, multiple TRP can correspond to the same cell identifier (cell ID) or different cell IDs. This cell ID can be either a physical cell ID or a virtual cell ID.

[0071] Multi-TRP (e.g., TRP#1, #2) can also be connected via an ideal / non-ideal backhaul link, and information, data, etc. are exchanged. Different codewords (CW) and different layers can be transmitted from each TRP of the multi-TRP respectively. As a method of multi-TRP transmission, Non-Coherent Joint Transmission (NCJT) can also be used.

[0072] In NCJT, for example, TRP#1 performs modulation mapping on the first codeword, performs layer mapping, and uses the first precoding for the first number of layers (e.g., 2 layers) to transmit the first PDSCH. In addition, TRP#2 performs modulation mapping on the second codeword, performs layer mapping, and uses the second precoding for the second number of layers (e.g., 2 layers) to transmit the second PDSCH.

[0073] In addition, regarding multiple PDSCHs (multi-PDSCHs) of NCJT, it can also be defined that they are partially or completely repeated (overlapped) with respect to at least one of the time domain and the frequency domain. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP can also be repeated on at least one of the time and frequency resources.

[0074] It can also be conceived that these first PDSCH and second PDSCH are not in a Quasi-Co-Location (QCL) relationship (not quasi-co-located). The reception of multi-PDSCH can also be replaced by the simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0075] Multiple PDSCHs from multiple TRPs (which can also be referred to as multi-PDSCH (multiple PDSCH)) can also be scheduled using 1 DCI (single DCI, single PDCCH) (single master mode). Multiple PDSCHs from multiple TRPs can also be scheduled separately using multiple DCIs (multi-DCIs, multiple PDCCH (multiple PDCCH)) (multi-master mode).

[0076] According to such a multi-TRP scenario, more flexible transmission control using a better quality channel can be performed.

[0077] To support intra-cell (with the same cell ID) and inter-cell (with different cell IDs) multi-TRP transmission based on multiple PDCCHs, in the multiple RRC configuration information for pairing the PDCCH and PDSCH with multiple TRPs, 1 control resource set (CORESET) within the PDCCH configuration information (PDCCH-Config) can also correspond to 1 TRP.

[0078] (CSI)

[0079] In NR, a UE uses a reference signal (or the resources for the reference signal) to measure the channel state and feedbacks (reports) channel state information (Channel State Information (CSI)) to the network (e.g., a base station).

[0080] The UE can also use at least one of a Channel State Information Reference Signal (CSI-RS), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Synchronization Signal (SS), a DeModulation Reference Signal (DMRS), etc. to measure the channel state.

[0081] The CSI-RS resources can also include at least one of a Non Zero Power (NZP) CSI-RS resource, a Zero Power (ZP) CSI-RS resource, and a CSI Interference Measurement (CSI-IM) resource.

[0082] The resources for measuring the signal components for CSI can also be referred to as Signal Measurement Resources (SMR), Channel Measurement Resources (CMR). The SMR (CMR) can also include, for example, NZP CSI-RS resources, SSBs, etc. for channel measurement.

[0083] The resources for measuring the interference components for CSI can also be referred to as Interference Measurement Resources (IMR). The IMR can also include at least one of, for example, NZP CSI-RS resources, SSBs, ZP CSI-RS resources, and CSI-IM resources for interference measurement.

[0084] The SS / PBCH block is a block that contains synchronization signals (e.g., a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS)) and a PBCH (and the corresponding DMRS), and can also be referred to as an SS block (SSB), etc.

[0085] In addition, the CSI may also include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), an SS / PBCH Block Resource Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), a Layer 1 Reference Signal Received Power (L1-RSRP), a Reference Signal Received Quality (L1-RSRQ), a Signal to Interference plus Noise Ratio (L1-SINR), a Signal to Noise Ratio (L1-SNR), etc.

[0086] The CSI may also have multiple parts. CSI Part 1 may also include information with a relatively small number of bits (e.g., RI). CSI Part 2 may also include information with a relatively large number of bits (e.g., CQI) such as information determined based on CSI Part 1.

[0087] In addition, the CSI may also be classified into several CSI types. Depending on the CSI type, the category, size, etc. of the reported information may also be different. For example, a CSI type set for communication using a single beam (also referred to as type I CSI, CSI for single beam, etc.) and a CSI type set for communication using multiple beams (also referred to as type II CSI, CSI for multiple beams, etc.) may be defined. The usage of the CSI type is not limited to this.

[0088] As a feedback method for the CSI, research is being conducted on periodic CSI (Periodic CSI (P-CSI)) reporting, aperiodic CSI (Aperiodic CSI (A-CSI, AP-CSI)) reporting, semi-persistent CSI (Semi-Persistent CSI (SP-CSI)) reporting, etc.

[0089] The UE can also use high-layer signaling, physical-layer signaling, or a combination thereof to notify CSI measurement configuration information.

[0090] In the present disclosure, the high-layer signaling can also be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0091] The MAC signaling can also use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information is, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0092] The physical-layer signaling can also be, for example, Downlink Control Information (DCI).

[0093] The CSI measurement configuration information can also be configured, for example, using the RRC information element "CSI-MeasConfig". The CSI measurement configuration information can also include CSI resource configuration information (RRC information element "CSI-ResourceConfig"), CSI report configuration information (RRC information element "CSI-ReportConfig"), etc. The CSI resource configuration information can be associated with the resources used for CSI measurement, and the CSI report configuration information can be associated with how the UE performs CSI reporting.

[0094] Describe the RRC information elements (or RRC parameters) related to CSI report configuration and CSI resource configuration.

[0095] The CSI report configuration information (“CSI-ReportConfig”) includes the resource information for channel measurement (“resourcesForChannelMeasurement”). In addition, the CSI report configuration information may also include the resource information for interference measurement (e.g., the NZP CSI-RS resource information for interference measurement (“nzp-CSI-RS-ResourcesForInterference”), the CSI-IM resource information for interference measurement (“csi-IM-ResourcesForInterference”), etc.). These resource information may also correspond to the ID (identifier) of the CSI resource configuration information (“CSI-ResourceConfigId”).

[0096] In addition, the ID of the CSI resource configuration information corresponding to each resource information (which may also be referred to as the CSI resource configuration ID) may be one or more identical values, or may be respective different values.

[0097] The CSI resource configuration information (“CSI-ResourceConfig”) may also include the CSI resource configuration information ID, the CSI-RS resource set list information (“csi-RS-ResourceSetList”), the resource type (“resourceType”), etc. The CSI-RS resource set list may also include at least one of the information on NZP CSI-RS and SSB for measurement (“nzp-CSI-RS-SSB”) and the CSI-IM resource set list information (“csi-IM-ResourceSetList”).

[0098] The resource type indicates the time-domain behavior of the resource configuration and can be set to “aperiodic”, “semi-persistent”, “periodic”. For example, the corresponding CSI-RS may also be referred to as A-CSI-RS (AP-CSI-RS), SP-CSI-RS, P-CSI-RS, respectively.

[0099] In addition, the resource for channel measurement may also be used for the calculation of, for example, CQI, PMI, L1-RSRP, etc. In addition, the resource for interference measurement may also be used for the calculation of L1-SINR, L1-SNR, L1-RSRQ, and other interference-related metrics.

[0100] (A-CSI-RS report / A-CSI-RS)

[0101] The triggering state may also be started using the CSI request field in the DCI.

[0102] For each A-CSI-RS resource within one CSI-RS set associated with each CSI triggering state, the UE is indicated of the QCL setting of the QCL RS source and QCL type by means of higher layer signaling containing a list of QCL information (qcl-Info) that references the TCI state (TCI-State) for the A-CSI-RS resources associated with that CSI triggering state. When one state referenced within this list is set to reference one RS associated with "QCL type D", this RS can also be an SS / PBCH block located within the same or different CC / DL BWP, or a CSI-RS resource that is set to be periodic or semi-persistent and is located within the same or different CC / DL BWP.

[0103] When the following condition a-1 is satisfied, the UE can also follow the subsequent steps a-1 and a-2.

[0104] [Condition a-1]

[0105] Regarding the scheduling offset between the last symbol of the PDCCH that transmits the triggering DCI (the DCI that triggers the A-CSI-RS) and the first symbol of the A-CSI-RS within the non-zero power CSI-RS (NZP-CSI-RS) resource set (NZP-CSI-RSResourceSet) that is set without accompanying TRS information (the higher layer parameter trs-Info), when the beam switch timing threshold (beamSwitchTiming) reported by the UE is one of {14, 28, 48}, the scheduling offset is less than the reported threshold, or when the reported threshold is one of {224, 336}, the scheduling offset is less than 48.

[0106] [Step a-1]

[0107] In the case where there is any other DL signal with one indicated TCI state within the same symbol as the CSI-RS, when the UE receives the A-CSI-RS, the UE also applies the QCL assumption of the DL signal. The DL signal (the other DL signal) refers to: a PDSCH with an offset greater than or equal to the timeDurationForQCL for QCL; an A-CSI-RS scheduled with an offset greater than or equal to the beam switching timing threshold when one of the beam switching timing thresholds reported by the UE is {14, 28, 48}; an A-CSI-RS scheduled with an offset greater than 48 when one of the beam switching timing thresholds reported by the UE is {224, 336}; a periodic CSI-RS (P-CSI-RS); and a semi-persistent CSI-RS (SP-CSI-RS).

[0108] [Step a-2]

[0109] Otherwise, when the UE receives the A-CSI-RS, the UE applies the QCL assumption used in the CORESET with the lowest controlResourceSetId associated with the monitored search space in the last time slot within the active BWP of the serving cell where one or more CORESETs are monitored.

[0110] When the following condition b-1 is satisfied, the UE may also follow the following step b-1.

[0111] [Condition b-1]

[0112] For the scheduling offset between the last symbol of the PDCCH that transmits the triggering DCI (the DCI that triggers the A-CSI-RS) and the first symbol of the A-CSI-RS, when one of the beam switching timing thresholds reported by the UE is {14, 28, 48}, the scheduling offset is greater than or equal to the reported threshold, or when one of the reported thresholds is {224, 336}, the scheduling offset is greater than 48.

[0113] [Step b-1]

[0114] The UE is expected to apply the QCL assumption within the TCI state indicated for the A-CSI-RS resource within the CSI trigger state indicated by the CSI trigger field (CSI request field) within the DCI.

[0115] In a multi-TRP system based on a single DCI, it is being studied that in the case where the scheduling offset of A-CSI-RS is less than a threshold (e.g., beam switching timing threshold, beamSwitchTiming), the UE can also follow steps A-1 and A-2.

[0116] [Step A-1]

[0117] In the case where there is any other DL signal with the indicated TCI state within the same symbol as A-CSI-RS, the UE can also follow the following steps A-1-1 and A-1-2.

[0118] [[Step A-1-1]]

[0119] The UE can also apply the QCL type D of the TCI state (one or two TCI states) of this DL signal to the buffering of the symbol of A-CSI-RS.

[0120] [[Step A-1-2]]

[0121] After buffering and DCI decoding are completed, the UE can measure CSI on A-CSI-RS as in the following steps A-1-2-1 and A-1-2-2.

[0122] [[[Step A-1-2-1]]]

[0123] In the case where this DL signal (other DL signal) references the PDSCH scheduled using two TCI states, the UE can use the A-CSI-RS buffered using the QCL type D of the first TCI state of this DL signal for CSI measurement.

[0124] [[[Step A-1-2-2]]]

[0125] In the case where this DL signal (other DL signal) is indicated with one TCI state, the UE uses the buffered A-CSI-RS for CSI measurement.

[0126] [Step A-2]

[0127] In the case where there is no other DL signal with the indicated TCI state within the same symbol as A-CSI-RS, the UE can also follow the following step A-2-1.

[0128] [[Step A-2-1]]

[0129] The UE applies the QCL type D of the default TCI state (one or two TCI states) of the PDSCH to the buffering of the symbols of the A-CSI-RS. The default TCI state of the PDSCH is the two TCI states corresponding to the lowest code point among the TCI code points including two different TCI states.

[0130] For example, the UE receives CSI-RS1 using TCI state 1 and receives CSI-RS1 using TCI state 2. The UE buffers two received signals (stored in the memory).

[0131] [[Step A-2-2]]

[0132] After buffering and DCI decoding are completed, the UE can measure CSI on the A-CSI-RS in any one of the following Option 1 and Option 2.

[0133] [[[Option 1]]]

[0134] The UE uses the A-CSI-RS buffered with the QCL type D of the first TCI state for CSI measurement. The UE may also not buffer the A-CSI-RS using the QCL type D of the second TCI state.

[0135] [[[Option 2]]]

[0136] When the indicated TCI state of the A-CSI-RS is the same as one of the two default TCI states, the UE may also use the A-CSI-RS buffered with the QCL type D of the TCI state the same as the indicated TCI state for CSI measurement. When the indicated TCI state of the A-CSI-RS is not the same as either of the two default TCI states, the UE uses the A-CSI-RS buffered with the QCL type D of the first default TCI state for CSI measurement.

[0137] In step A-1 (when there is any other DL signal with the indicated TCI state within the same symbol as the A-CSI-RS), the case where the A-CSI-RS is prioritized over the PDSCH is considered. In addition, the case where the other DL signal is not the PDSCH is considered. However, the actions for the other DL signals are not clear. If the actions are not clear like this, there are concerns such as the A-CSI-RS not being measured properly, throughput reduction, and communication quality degradation.

[0138] Therefore, the inventors of the present invention came up with a method for measuring the A-CSI-RS.

[0139] In this disclosure, "A / B" and "at least one of A and B" can also be replaced with each other.

[0140] In the present disclosure, a panel, an uplink (UL) transmission entity, a TRP, a spatial relationship, a control resource set (CORESET), a PDSCH, a codeword, a base station, an antenna port of a certain signal (e.g., a demodulation reference signal (DMRS) port), a group of antenna ports of a certain signal (e.g., a DMRS port group), a group for multiplexing (e.g., a code division multiplexing (CDM) group, a reference signal group, a CORESET group), a CORESET pool, a CW, a redundancy version (RV), a layer (MIMO layer, transmission layer, spatial layer) can also be replaced with each other. In addition, a panel identifier (ID) and a panel can also be replaced with each other. In the present disclosure, a TRP ID and a TRP can also be replaced with each other.

[0141] In the present disclosure, an index, an ID, an indicator, a resource ID, etc. can also be replaced with each other.

[0142] In the present disclosure, a cell, a CC, a carrier, a BWP, an active DL BWP, an active UL BWP, a band can also be replaced with each other. In the present disclosure, an RRC parameter, a high-layer parameter, an RRC information element (IE), an RRC message can also be replaced with each other.

[0143] In the present disclosure, a beam, a TCI state, a QCL assumption, QCL parameters, a spatial domain reception filter, a UE spatial domain reception filter, a UE reception beam, a DL reception beam, DL precoding, a DL precoder, a DL-RS, a QCL type D of a TCI state, an RS of a QCL type D of a TCI state, an RS of a QCL type D of a TCI state or a QCL assumption, an RS of a QCL type A of a TCI state or a QCL assumption can also be replaced with each other. In the present disclosure, a QCL type X-RS, a DL-RS associated with a QCL type X, a DL-RS having a QCL type X, a source of a DL-RS, an SSB, a CSI-RS can also be replaced with each other.

[0144] In the present disclosure, a UE configured with multiple TRPs can also determine at least one of a TRP corresponding to DCI, a TRP corresponding to a PDSCH or UL transmission (PUCCH, PUSCH, SRS, etc.) scheduled by DCI, etc. based on at least one of the following.

[0145] · Values of specific fields included in DCI (e.g., a field specifying a TRP, an antenna port field, a PRI).

[0146] · The DMRS corresponding to the scheduled PDSCH / PUSCH (e.g., the sequence, resources, CDM group, DMRS ports, DMRS port group, antenna port group, etc. of the DMRS).

[0147] · The DMRS corresponding to the PDCCH on which the DCI is transmitted (e.g., the sequence, resources, CDM group, DMRS ports, DMRS port group, etc. of the DMRS).

[0148] · The CORESET that has received the DCI (e.g., the CORESET pool ID of the CORESET, the ID of the CORESET, the scrambling ID (which can also be replaced by the sequence ID), resources, etc.).

[0149] · The RS (RS related group, etc.) used for TCI state, QCL assumption, spatial relation information, etc.

[0150] In the present disclosure, a single PDCCH (DCI) is a PDCCH (DCI) of the first scheduling type (e.g., which can also be referred to as scheduling type A (or type 1)). In addition, a multi-PDCCH (DCI) can also be referred to as a PDCCH (DCI) of the second scheduling type (e.g., scheduling type B (or type 2)).

[0151] In the present disclosure, a single PDCCH can also be envisioned as being supported in the case of multiple TRPs using an ideal backhaul. A multi-PDCCH can also be envisioned as being supported in the case of multiple TRPs using a non-ideal backhaul.

[0152] In addition, an ideal backhaul can also 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. A non-ideal backhaul can also 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 this.

[0153] In the present disclosure, multiple TRPs, multiple TRP systems, multiple TRP transmissions, and multiple PDSCHs can also be mutually replaced. In the present disclosure, a single DCI, a single PDCCH, a multiple TRP system based on a single DCI, and two TCI states being activated on at least 1 TCI code point can also be mutually replaced.

[0154] In the present disclosure, activate, update, indicate, and set can also be mutually replaced.

[0155] In the present disclosure, the scheduling offset of the A-CSI-RS, the scheduling offset between the last symbol of the PDCCH for transmitting the triggering DCI and the first symbol of the A-CSI-RS, and the scheduling offset between the last symbol of the PDCCH for transmitting the triggering DCI and the first symbol of the A-CSI-RS within the NZP-CSI-RS resource set (NZP-CSI-RSResourceSet) set without accompanying TRS information (higher layer parameter trs-Info) can also be replaced with each other.

[0156] In the present disclosure, the threshold, the beam switch timing threshold (beamSwitchTiming), the beam switch timing threshold reported by the UE, and the constant (e.g., 48) can also be replaced with each other.

[0157] In the present disclosure, the TCI state applied to the A-CSI-RS when the scheduling offset of the A-CSI-RS is less than the beam switch timing threshold and the default TCI state of the A-CSI-RS can also be replaced with each other.

[0158] In the present disclosure, other DL signals, known other DL signals, and other DL signals for which the known conditions of the TCI state are satisfied can also be replaced with each other.

[0159] In the present disclosure, the TCI state, the A-CSI-RS buffered using the TCI state, and the A-CSI-RS received using the TCI state can also be replaced with each other.

[0160] (Wireless communication method)

[0161] In a multi-TRP system (multi-TRP transmission) based on a single DCI, when the scheduling offset of the A-CSI-RS is less than the beam switch timing threshold (beamSwitchTiming) and there is any other DL signal with an indicated TCI state within the same symbol as the A-CSI-RS, the other DL signal can also be any one of the following Case 1 to Case 4.

[0162] [Case 1]

[0163] A PDSCH scheduled with an offset greater than or equal to the threshold (timeDurationForQCL). The PDSCH can also be any one of the following Case 1-1 and Case 1-2.

[0164] [Case 1-1] A PDSCH with two indicated TCI states.

[0165] [Case 1-2] A PDSCH with one indicated TCI state.

[0166] [Case 2]

[0167] When the threshold reported by the UE (beam switching timing threshold, beamSwitchTiming) is one of {14, 28, 48}, the A-CSI-RS scheduled using an offset (scheduling offset) above the threshold, and when the threshold reported by the UE is one of {224, 336}, the A-CSI-RS scheduled using an offset (scheduling offset) above the threshold. Hereinafter, the A-CSI-RS (other DL signals) with a scheduling offset above the beam switching timing threshold may also be referred to as A-CSI-RS#2, and the A-CSI-RS with a scheduling offset less than the beam switching timing threshold may also be referred to as A-CSI-RS#1. A-CSI-RS#1 and A-CSI-RS#2 are transmitted in the same symbol.

[0168] [Case 3]

[0169] P-CSI-RS.

[0170] [Case 4]

[0171] SP-CSI-RS.

[0172] In a multi-TRP system based on single DCI, when the scheduling offset of the A-CSI-RS is less than the beam switching timing threshold and there is any other DL signal with an indicated TCI state in the same symbol as the A-CSI-RS, the UE may also determine the TCI state for the A-CSI-RS based on at least one of the indicated TCI state for the other DL signal and the default TCI state for the PDSCH.

[0173] <First Embodiment>

[0174] For at least one of Case 1 (Case 1-1 and 1-2) to 4, the default TCI state for buffering the A-CSI-RS transmitted based on single DCI may also follow the following.

[0175] [Case 1-1]

[0176] The UE may also follow any one of Option 1 and Option 2 below.

[0177] [[Option 1]]

[0178] The QCL type D of the default TCI state for buffering the A-CSI-RS follows the QCL type D of the indicated TCI state (two TCI states) of the PDSCH. That is, the UE may also use two TCI states in the A-CSI-RS buffer.

[0179] [Option 2]

[0180] For the default TCI state for A-CSI-RS buffering, QCL type D can also follow the QCL type D of the two TCI states corresponding to the lowest code point among the TCI code points including two different TCI states.

[0181] [Case 1-2]

[0182] The UE can also follow either Option 1 or Option 2 below.

[0183] [Option 1]

[0184] For the default TCI state for A-CSI-RS buffering, QCL type D follows the QCL type D of the indicated TCI state (one TCI state) of the PDSCH. That is, the UE can also use one TCI state in A-CSI-RS buffering.

[0185] [Option 2]

[0186] For the default TCI state for A-CSI-RS buffering, QCL type D follows the QCL type D of the two TCI states corresponding to the lowest code point among the TCI code points including two different TCI states.

[0187] [Case 2]

[0188] The UE can also follow either Option 1 or Option 2 below.

[0189] [Option 1]

[0190] For the default TCI state for buffering of A-CSI-RS#1, QCL type D follows the QCL type D of the indicated TCI state of A-CSI-RS#2 (other DL signal in Case 2).

[0191] [Option 2]

[0192] For the default TCI state for buffering of A-CSI-RS#1, QCL type D follows the QCL type D of the two TCI states corresponding to the lowest code point among the TCI code points including two different TCI states. In this case, the UE can also follow at least one of Option 2-0 to Option 2-3 below (priority rule (priority order) or UE action).

[0193] [[Option 2-0]]

[0194] The UE may also assume that one of the QCL types D of A-CSI-RS #2 is the same as that of the default TCI state. One of the QCL types D of the default TCI state may be either the first default TCI state or the second default TCI state.

[0195] [[Option 2-1]]

[0196] The UE may also discard (or may not measure) A-CSI-RS #2. The UE may also discard (or may not measure) A-CSI-RS #1.

[0197] [[Option 2-2]]

[0198] When one of the TCI states of A-CSI-RS #2 is the same as that of the default TCI state, the UE does not need to discard any DL signals. When none of the TCI states of A-CSI-RS #2 is the same as that of the default TCI state, the UE may also discard A-CSI-RS #2.

[0199] [[Option 2-3]]

[0200] New UE capabilities (capability information) indicating that the UE supports receiving more than 2 TCI states are defined. UEs supporting the new UE capabilities do not need to discard any DL signals. UEs not supporting the new UE capabilities may also discard A-CSI-RS #2.

[0201] To use the indicated TCI state of A-CSI-RS for buffering, Option 1 gives A-CSI-RS priority over PDSCH. In this case, the UE cannot receive PDSCH with other TCI states. Option 2 gives PDSCH priority over A-CSI-RS.

[0202] [Case 3]

[0203] The UE may also follow either Option 1 or Option 2 below.

[0204] [[Option 1]]

[0205] The QCL type D of the default TCI state for A-CSI-RS buffering may also follow the QCL type D of the indicated TCI state of P-CSI-RS (other DL signals in Case 3).

[0206] [[Option 2]]

[0207] The QCL type D of the default TCI state for A-CSI-RS buffering follows the QCL type D of the two TCI states corresponding to the lowest code point among the two different TCI states included in the TCI code point. In this case, the UE can also follow at least one of the following options 2-0 to 2-3 (priority rules (priority order) or UE actions).

[0208] [[Option 2-0]]

[0209] The UE can also assume that one of the QCL type D of P-CSI-RS is the same as the QCL type D of the default TCI state. One of the QCL type D of the default TCI state can be either the first default TCI state or the second default TCI state.

[0210] [[Option 2-1]]

[0211] The UE can also discard (or not measure) P-CSI-RS.

[0212] [[Option 2-2]]

[0213] When the TCI state of P-CSI-RS is the same as one of the default TCI states, the UE does not need to discard any DL signals. When the TCI state of P-CSI-RS is different from either of the default TCI states, the UE can also discard P-CSI-RS.

[0214] [[Option 2-3]]

[0215] A new UE capability (capability information) indicating that the UE supports reception of more than two TCI states is defined. A UE that supports the new UE capability does not need to discard any DL signals. A UE that does not support the new UE capability can also discard P-CSI-RS.

[0216] [Case 4]

[0217] The UE can also follow either of the following options 1 and 2.

[0218] [[Option 1]]

[0219] The QCL type D of the default TCI state for A-CSI-RS buffering can also follow the QCL type D of the indicated TCI state of SP-CSI-RS (other DL signals in Case 4).

[0220] [[Option 2]]

[0221] The QCL type D of the default TCI state for A-CSI-RS buffering follows the QCL type D of the two TCI states corresponding to the lowest code point among the TCI code points containing two different TCI states. In this case, the UE can also follow at least one of the following options 2-0 to 2-3 (priority rules (priority order) or UE actions).

[0222] [[Option 2-0]]

[0223] The UE can also assume that one of the QCL type D of the SP-CSI-RS is the same as one of the QCL type D of the default TCI state. One of the QCL type D of the default TCI state can be either the first default TCI state or the second default TCI state.

[0224] [[Option 2-1]]

[0225] The UE can also discard (or not measure) the SP-CSI-RS.

[0226] [[Option 2-2]]

[0227] When the TCI state of the SP-CSI-RS is the same as one of the default TCI states, the UE does not need to discard any DL signals. When the TCI state of the SP-CSI-RS is different from any of the default TCI states, the UE can also discard the SP-CSI-RS.

[0228] [[Option 2-3]]

[0229] New UE capabilities (capability information) indicating that the UE supports receiving more than two TCI states are defined. UEs that support the new UE capabilities do not need to discard any DL signals. UEs that do not support the new UE capabilities can also discard the SP-CSI-RS.

[0230] In options 2-1 or 2-2 of cases 2 to 4, the UE can either measure at least one of the A-CSI-RS and other DL signals or discard at least one of the A-CSI-RS and other DL signals.

[0231] <<Variant Example>>

[0232] The UE can also support any combination of the options in cases 1 to 4. For example, the UE can support option 1 for cases 1 to 4, and can support option 1 for case 1 and option 2 for cases 2 to 4.

[0233] According to the above first embodiment, for A-CSI-RS, an appropriate default TCI state can be determined based on other DL signals.

[0234] <Second Embodiment>

[0235] For each case in multi-TRP transmission based on single DCI, the UE can also determine the default TCI state for CSI measurement on A-CSI-RS by following at least one of the following steps 2-1 and 2-2.

[0236] [Step 2-1]

[0237] When two default TCI states are applied to the A-CSI-RS buffer, the UE can also follow either of steps 2-1-1 and 2-1-2.

[0238] [[Step 2-1-1]]

[0239] The UE can also use the QCL type D of the first default TCI state in CSI measurement on A-CSI-RS.

[0240] [[Step 2-1-2]]

[0241] When the TCI state (the indicated TCI state) of A-CSI-RS is the same as one of the two default TCI states for buffering, the UE can also use the TCI state (the QCL type D thereof) of this A-CSI-RS for CSI measurement. If not, when the TCI state (the indicated TCI state) of A-CSI-RS is different from either of the two default TCI states for buffering, the UE can also use the QCL type D of the first default TCI state for CSI measurement.

[0242] Figure 1 Shows an example of step 2-1-2. When the indicated TCI state for A-CSI-RS is the same as one of the two default TCI states (S110: Yes), the UE uses the QCL type D of this indicated TCI state for CSI measurement (S120). When the indicated TCI state for A-CSI-RS is different from either of the two default TCI states (S110: No), the UE uses the QCL type D of the first default TCI state for CSI measurement for this indicated TCI state (S130).

[0243] [Step 2-2]

[0244] If not, (when two default TCI states are not applied to the A-CSI-RS buffer), when one default TCI state is applied to the A-CSI-RS buffer, the UE can also use the QCL type D of the buffered TCI state (the default TCI state for buffering) for CSI measurement on A-CSI-RS.

[0245] <Variation Example>

[0246] The UE may also support a combination of the first embodiment and the second embodiment.

[0247] According to the second embodiment above, the default TCI state can be used to appropriately measure A-CSI-RS.

[0248] <Third Embodiment>

[0249] In a multi-TRP system (multi-TRP transmission) based on single DCI, when the scheduling offset of A-CSI-RS is less than the beam switching timing threshold (beamSwitchTiming), the UE may also follow at least one of the following steps 3-1 and 3-2.

[0250] [Step 3-1]

[0251] When there is a PDSCH scheduled with an offset greater than or equal to the usage threshold (timeDurationForQCL) within the same symbol as A-CSI-RS, the UE may also follow at least one of the following steps 3-1-1 and 3-1-2.

[0252] [[Step 3-1-1]]

[0253] The UE may also apply the QCL type D of the TCI state (one or two TCI states) of this PDSCH to the buffering of the symbol of A-CSI-RS.

[0254] [[Step 3-1-2]]

[0255] After buffering and DCI decoding are completed, the UE can measure CSI on A-CSI-RS as at least one of the following steps 3-1-2-1 and 3-1-2-2.

[0256] [[[Step 3-1-2-1]]]

[0257] When the TCI state (the indicated TCI state) of A-CSI-RS is the same as one of the two default TCI states, the UE may also use the A-CSI-RS buffered using the TCI state of this A-CSI-RS for CSI measurement.

[0258] [[[Step 3-1-2-2]]]

[0259] When the TCI state (the indicated TCI state) of the A-CSI-RS is different from either of the two default TCI states for buffering, the UE can also use the A-CSI-RS buffered with QCL type D of the first default TCI state for CSI measurement.

[0260] [Step 3-2]

[0261] When there is any other CSI-RS on the same symbol as the A-CSI-RS, or when there is no other DL signal using the indicated TCI state on the same symbol as the A-CSI-RS, the UE can also follow at least one of the following Steps 3-2-1 and 3-2-2.

[0262] [[Step 3-2-1]]

[0263] The UE applies the QCL type D of the default TCI state for PDSCH to buffer the symbols of the A-CSI-RS. The default TCI state for PDSCH can also be the two TCI states corresponding to the lowest code point among the TCI code points including two different TCI states.

[0264] [[Step 3-2-2]]

[0265] After buffering and DCI decoding are completed, the UE can measure CSI on the A-CSI-RS as at least one of the following Steps 3-2-2-1 and 3-2-2-2.

[0266] [[[Step 3-2-2-1]]]

[0267] When the TCI state (the indicated TCI state) of the A-CSI-RS is the same as one of the two default TCI states, the UE can also use the A-CSI-RS buffered with the TCI state of this A-CSI-RS for CSI measurement.

[0268] [[[Step 3-2-2-2]]]

[0269] When the TCI state (the indicated TCI state) of the A-CSI-RS is different from either of the two default TCI states for buffering, the UE can also use the A-CSI-RS buffered with QCL type D of the first default TCI state for CSI measurement.

[0270] According to the above third embodiment, in a multi-TRP system based on single DCI, even when the scheduling offset of the A-CSI-RS is less than the beam switching timing threshold, the UE can appropriately measure the A-CSI-RS.

[0271] (Wireless communication system)

[0272] Hereinafter, the structure 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 above-described wireless communication methods according to the respective embodiments of the present disclosure.

[0273] Figure 2 FIG. is an example showing a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may also be a system that realizes communication by using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the 5th generation mobile communication system New Radio (5G NR), or the like.

[0274] In addition, the wireless communication system 1 may also 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.

[0275] 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.

[0276] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both the MN and the SN are base stations (gNBs) of NR (NR-NR Dual Connectivity (NN-DC))).

[0277] The wireless communication system 1 may also include: a base station 11 that forms a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a - 12c) that is disposed within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration, number, etc. of each cell and the user terminal 20 are not limited to the manner shown in the figure. Hereinafter, without distinguishing between the base stations 11 and 12, they are collectively referred to as the base station 10.

[0278] The user terminal 20 may also be connected to at least one of the multiple base stations 10. The user terminal 20 may also utilize at least one of carrier aggregation (CA) and dual connectivity (DC) that uses multiple component carriers (CCs).

[0279] Each CC may also 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 also be included in FR1, and the small cell C2 may also 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). Additionally, the frequency bands, definitions, etc. of FR1 and FR2 are not limited thereto. For example, FR1 may correspond to a frequency band higher than FR2.

[0280] Furthermore, the user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0281] The multiple base stations 10 may be connected by wire (e.g., optical fiber based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11, which is equivalent to the upper - level station, may be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12, which is equivalent to a relay station, may be referred to as an IAB node.

[0282] The base station 10 can also be connected to the core network 30 via other base stations 10 or directly. For example, the core network 30 can also include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.

[0283] The user terminal 20 can also be a terminal that supports at least one of communication modes such as LTE, LTE-A, 5G, etc.

[0284] In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) can also 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. can also be used.

[0285] The wireless access method can also be referred to as a waveform. Additionally, in the wireless communication system 1, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be applied in the wireless access methods of the UL and DL.

[0286] In the wireless communication system 1, as a downlink channel, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. that are shared among the user terminals 20 can also be used.

[0287] In addition, in the wireless communication system 1, as the uplink channel, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. can also be used.

[0288] User data, high-layer control information, a System Information Block (SIB), etc. are transmitted through the PDSCH. User data, high-layer control information, etc. can also be transmitted through the PUSCH. In addition, a Master Information Block (MIB) can be transmitted through the PBCH.

[0289] Low-layer control information can also be transmitted through the PDCCH. The low-layer control information can also include, for example, downlink control information (Downlink Control Information (DCI)), and this downlink control information includes scheduling information of at least one of the PDSCH and the PUSCH.

[0290] In addition, the DCI that schedules the PDSCH can also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH can also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH can also be interpreted as DL data, and the PUSCH can also be interpreted as UL data.

[0291] In the detection of the PDCCH, a Control Resource Set (CORESET) and a search space can also be utilized. The CORESET corresponds to the resource for searching for DCI. The search space corresponds to the search area and search method of PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0292] A search space may also correspond to PDCCH candidates that match one or more aggregation levels. One or more search spaces may also be referred to as a search space set. Additionally, in the present disclosure, terms such as "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. may be used interchangeably.

[0293] Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (e.g., also referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)) may also be transmitted via PUCCH. A random access preamble for establishing a connection with a cell may also be transmitted via PRACH.

[0294] In addition, in the present disclosure, the downlink, uplink, etc. may also be expressed without "link". Furthermore, it may also be expressed that "Physical" is not included at the beginning of various channels.

[0295] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, 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 also be transmitted.

[0296] The synchronization signal may also be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as an SS / PBCH block, an SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0297] In addition, in the wireless communication system 1, as an Uplink Reference Signal (UL-RS), a sounding reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may also be transmitted. In addition, DMRS may also be referred to as a UE-specific Reference Signal.

[0298] (Base station)

[0299] Figure 3 FIG. is an example showing the structure 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 path interface (transmission line interface) 140. In addition, one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140 may be provided respectively.

[0300] In addition, in this example, functional blocks of the characteristic parts in the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0301] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, etc. described based on common knowledge in the technical field related to the present disclosure.

[0302] The control unit 110 can also control the generation, scheduling (e.g., resource allocation, mapping), etc. of signals. The control unit 110 can also control the transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 can also generate data, control information, sequence, etc. to be transmitted as signals, and forward them to the transmission and reception unit 120. The control unit 110 can also perform call processing (setting, releasing, etc.) of communication channels, state management of the base station 10, management of radio resources, etc.

[0303] The transmission and reception unit 120 may also include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission and 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 and reception circuit, etc. that can be described based on common knowledge in the technical field related to the present disclosure.

[0304] The transmission and reception unit 120 can be configured as an integrated transmission and reception unit, or can be composed of a transmission unit and a reception unit. The transmission unit can also be composed of the transmission processing unit 1211 and the RF unit 122. The reception unit can also be composed of the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

[0305] The transmission and reception antenna 130 can be composed of an antenna that can be described based on common knowledge in the technical field related to the present disclosure, such as an array antenna, etc.

[0306] The transmission and reception unit 120 can also transmit the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission and reception unit 120 can also receive the above-mentioned uplink channels, uplink reference signals, etc.

[0307] The transmission and reception unit 120 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0308] The transmission / reception unit 120 (transmission processing unit 1211) may also perform, for example, 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 the data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0309] The transmission / reception unit 120 (transmission processing unit 1211) may also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering processing, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0310] The transmission / reception unit 120 (RF unit 122) may also perform modulation to a radio frequency band, filtering processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0311] On the other hand, the transmission / reception unit 120 (RF unit 122) may also perform amplification, filtering processing, demodulation to a baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 130.

[0312] The transmission / reception unit 120 (reception processing unit 1212) may also perform reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0313] The transmission / reception unit 120 (measurement unit 123) may also perform measurements related to the received signal. For example, the measurement unit 123 may also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may also perform measurements on received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0314] The transmission path interface 140 may also transmit and receive signals (backhaul signaling) between the device included in the core network 30, other base stations 10, etc., and may also obtain, transmit, etc. user data (user plane data), control plane data, etc. for the user terminal 20.

[0315] In addition, the transmission unit and reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0316] When there are other downlink signals in the same symbol as the aperiodic Channel State Information Reference Signal (A-CSI-RS) and the scheduling offset of the A-CSI-RS is less than a threshold, the control unit 110 may also determine the TCI state for the A-CSI-RS based on at least one of the indicated transmission control indication (TCI) state for the downlink signal and two default TCI states for the Physical Downlink Shared Channel. The transmission / reception unit 120 may also receive a report of the A-CSI-RS received using the determined TCI state.

[0317] (User Terminal)

[0318] Figure 4This is a diagram showing an example of the structure of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively.

[0319] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it can also be assumed that the user terminal 20 also has other functional blocks required for wireless communication. A part of the processing of each unit described below may also be omitted.

[0320] The control unit 210 implements the overall control of the user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0321] The control unit 210 may also control the generation, mapping, etc. of signals. The control unit 210 may also control the transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission / reception unit 220.

[0322] 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. described based on the common knowledge in the technical field related to the present disclosure.

[0323] 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.

[0324] The transmission / reception antenna 230 can be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0325] The transmission / reception unit 220 may also receive the above-mentioned downlink channels, synchronization signals, downlink reference signals, etc. The transmission / reception unit 220 may also transmit the above-mentioned uplink channels, uplink reference signals, etc.

[0326] The transmission / reception unit 220 can also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc. to form at least one of a transmission beam and a reception beam.

[0327] The transmission / reception unit 220 (transmission processing unit 2211) can also perform, for example, PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0328] The transmission / reception unit 220 (transmission processing unit 2211) can also perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering processing, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0329] In addition, regarding whether to apply DFT processing, it can also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is active (enabled), the transmission / reception unit 220 (transmission processing unit 2211) can also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using the DFT-s-OFDM waveform. In other cases, the transmission / reception unit 220 (transmission processing unit 2211) can also not perform DFT processing as the above-mentioned transmission processing.

[0330] The transmission / reception unit 220 (RF unit 222) can also perform modulation to the radio frequency band, filtering processing, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 230.

[0331] On the other hand, the transmission / reception unit 220 (RF unit 222) can also perform amplification, filtering processing, demodulation to the baseband signal, etc. on the radio frequency band signal received through the transmission / reception antenna 230.

[0332] The transmission / reception unit 220 (reception processing unit 2212) can also perform reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. on the obtained baseband signal, and obtain user data, etc.

[0333] The transmission / reception unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may also perform measurements on 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 also be output to the control unit 210.

[0334] In addition, the transmission unit and the reception unit of the user terminal 20 of the present disclosure may also be constituted by at least one of a transmission / reception unit 220, a transmission / reception antenna 230, and a transmission path interface 240.

[0335] When there is another downlink signal in the same symbol as the aperiodic channel state information reference signal (A-CSI-RS) and the scheduling offset of the A-CSI-RS is less than a threshold, the control unit 210 may also determine the TCI state for the A-CSI-RS based on at least one of the indicated transmission control indication (TCI) state for the downlink signal and two default TCI states for the physical downlink shared channel. The transmission / reception unit 220 may also use the determined TCI state to receive the A-CSI-RS.

[0336] The downlink signal may also be one of the physical downlink shared channel, other A-CSI-RS, periodic CSI-RS, semi-persistent CSI-RS having a scheduling offset equal to or greater than the duration for quasi-co-location.

[0337] The control unit 210 may also measure at least one of the A-CSI-RS and the downlink signal.

[0338] When the indicated TCI state for the A-CSI-RS is the same as one of the two default TCI states for the physical downlink shared channel, the control unit 210 may also use the one default TCI state as the determined TCI state.

[0339] (Hardware Structure)

[0340] In addition, the block diagrams used in the description of the above embodiments illustrate blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. Furthermore, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented by a single device physically or logically combined, or can be implemented by two or more physically or logically separated devices directly or indirectly (e.g., by wire, wireless, etc.) connected by these multiple devices. The functional block can also be implemented by combining the above single device or the above multiple devices with software.

[0341] Here, in terms of functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuration (setting), reconfiguration (resetting), allocation (allocating, mapping), assignment, etc., but are not limited to these. For example, a functional block (structural unit) that implements the transmission function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0342] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure can also function as a computer that processes the wireless communication method of the present disclosure. Figure 5 FIG. is an example of the hardware structure of a base station and a user terminal according to an embodiment. The above base station 10 and user terminal 20 can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0343] In addition, in the present disclosure, terms such as device, circuit, equipment, section, unit, etc. can be replaced with each other. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of the devices shown in the figure, or can be configured not to include some devices.

[0344] For example, only one processor 1001 is illustrated, but there may be multiple processors. In addition, the processing may be executed by one processor, or may be executed simultaneously, sequentially, or by other means by two or more processors. Further, the processor 1001 may also be implemented by one or more chips.

[0345] Regarding each function in the base station 10 and the user terminal 20, for example, by reading a specific software (program) into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs operations and controls communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage device 1003, thereby implementing the function.

[0346] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may also be constituted by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc. For example, at least a part of the above control unit 110 (210), transmission / reception unit 120 (220), etc. may also be implemented by the processor 1001.

[0347] In addition, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage device 1003 and the communication device 1004 into the memory 1002, and executes various processes based on them. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments can be used. For example, the control unit 110 (210) may also be implemented by a control program stored in the memory 1002 and operating in the processor 1001, and the same can be applied to other functional blocks.

[0348] The memory 1002 may also be a computer-readable recording medium, for example, constituted by at least one of a read-only memory (Read Only Memory (ROM)), an erasable programmable read-only memory (Erasable Programmable ROM (EPROM)), an electrically erasable programmable read-only memory (Electrically EPROM (EEPROM)), a random access memory (Random Access Memory (RAM)), and other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), software module, etc. that can be executed to implement the wireless communication method according to an embodiment of the present disclosure.

[0349] The storage device 1003 can also be a computer-readable recording medium, which is composed of, for example, at least one of a flexible disc, a floppy (registered trademark) disc, an optical disc (such as a compact disc (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc, a removable disc, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage device 1003 can also be referred to as an auxiliary storage device.

[0350] The communication device 1004 is hardware (a transmitting and receiving device) for performing inter-computer communication 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. In order to implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), transmitting and receiving antenna 130 (230), etc. can also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) can also be physically or logically separately installed by a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0351] The input device 1005 is an input device (such as a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) for receiving an input from the outside. The output device 1006 is an output device (such as a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) for performing an output to the outside. In addition, the input device 1005 and the output device 1006 can also be of an integrated structure (such as a touch panel).

[0352] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 can be constituted by a single bus or by different buses between each device.

[0353] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA). Some or all of the functional blocks may also be implemented using this hardware. For example, the processor 1001 may also be implemented using at least one of these hardware components.

[0354] (Variant example)

[0355] Furthermore, the terms described in this disclosure and the terms necessary for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may also be replaced with each other. In addition, a signal may also be a message. A Reference Signal can also be abbreviated as RS and may also be referred to as a Pilot, a pilot signal, etc. according to the applied standard. In addition, a Component Carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0356] A radio frame may also be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) that make up the radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) independent of the numerology.

[0357] Here, the numerology may also refer to communication parameters applied in at least one of the transmission and reception of a certain signal or channel. For example, the numerology may also represent at least one of a SubCarrier Spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a Transmission Time Interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transmitter-receiver in the frequency domain, and a specific windowing process performed by a transmitter-receiver in the time domain.

[0358] A time slot can also be composed of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.). In addition, a time slot can also be a time unit based on a parameter set.

[0359] A time slot can also contain multiple mini-slots. Each mini-slot can also be composed of one or more symbols in the time domain. In addition, a mini-slot can also be referred to as a sub-slot. A mini-slot can also be composed of a smaller number of symbols than a time slot. The Physical Downlink Shared Channel (PDSCH) (or Physical Uplink Shared Channel (PUSCH)) transmitted in a time unit larger than a mini-slot can also be referred to as PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot can also be referred to as PDSCH (PUSCH) mapping type B.

[0360] A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol all represent time units when transmitting signals. A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol can also use their respective other names. In addition, the time units such as frames, sub-frames, time slots, mini-slots, and symbols in this disclosure can also be replaced with each other.

[0361] For example, a sub-frame can also be referred to as a Transmission Time Interval (TTI), multiple consecutive sub-frames can also be referred to as a TTI, a time slot or a mini-slot can also be referred to as a TTI. That is to say, at least one of a sub-frame and a TTI can be a sub-frame (1 ms) in the existing Long-Term Evolution (LTE), can also be a period shorter than 1 ms (for example, 1 - 13 symbols), and can also be a period longer than 1 ms. In addition, the unit representing a TTI can also not be referred to as a sub-frame, but as a time slot, a mini-slot, etc.

[0362] Here, a TTI, for example, refers to the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a 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 units of TTI. In addition, the definition of a TTI is not limited to this.

[0363] A TTI can also be the transmission time unit of a data packet (transmission block), a code block, a codeword, etc. that has undergone channel coding, and can also become the processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the actual time interval (such as the number of symbols) for mapping a transmission block, a code block, a codeword, etc. can also be shorter than this TTI.

[0364] In addition, in the case where a time slot or a mini time slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini time slot) can also be the minimum time unit for scheduling. In addition, the number of time slots (mini time slots) that constitute the minimum time unit for this scheduling can also be controlled.

[0365] A TTI having a time length of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel.8 - 12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI can also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub - time slot, a time slot, etc.

[0366] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can also be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be interpreted as a TTI having a TTI length less than that of the long TTI and 1 ms or more.

[0367] A resource block (Resource Block (RB)) is a resource allocation unit in the time domain and the frequency domain, and can also include one or more consecutive sub - carriers (sub - carriers) in the frequency domain. The number of sub - carriers included in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of sub - carriers included in an RB can also be determined based on the parameter set.

[0368] In addition, an RB can also include one or more symbols in the time domain, and can also be the length of a time slot, a mini time slot, a subframe, or a TTI. A TTI, a subframe, etc. can also be composed of one or more resource blocks respectively.

[0369] In addition, one or more RBs can also be referred to as a Physical RB (PRB), a Sub - Carrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, etc.

[0370] In addition, a resource block can also be composed of one or more resource elements (Resource Element (RE)). For example, one RE can also be a radio resource area of a sub - carrier and a symbol.

[0371] A Bandwidth Part (BWP) (which may also be referred to as partial bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks) used by a certain parameter set in a certain carrier. Here, the common RBs may also be determined by the indexes of the RBs based on the common reference point of the carrier. PRBs may also be defined in a certain BWP and be numbered additionally within that BWP.

[0372] A BWP may also include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be set within one carrier.

[0373] At least one of the set BWPs may be active, and the UE may not assume to transmit and receive specific signals / channels outside the active BWP. In addition, "cell", "carrier", etc. in this disclosure may also be interpreted as "BWP".

[0374] In addition, the structures such as the above-mentioned radio frames, subframes, time slots, mini time slots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini time slots included in a time slot, the number of symbols and RBs included in a time slot or mini time slot, the number of subcarriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0375] Furthermore, the information, parameters, etc. described in this disclosure may be represented by absolute values, may be represented by relative values with respect to a specific value, or may also be represented by corresponding other information. For example, radio resources may also be indicated by specific indexes.

[0376] In this disclosure, the names used for parameters, etc. are not restrictive names in all aspects. In addition, the mathematical formulas, etc. using these parameters may also be different from those clearly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and thus, the various names assigned to these various channels and information elements are not restrictive names in all aspects.

[0377] The information, signals, etc. described in this disclosure may also be represented by any one of various different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0378] In addition, information, signals, etc. can be output to at least one of the higher layer (upper layer) to the lower layer (lower layer) and from the lower layer to the higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0379] The input and output information, signals, etc. can be stored in a specific location (such as a memory), or can be managed using a management table. The input and output information, signals, etc. can be overwritten, updated, or appended. The output information, signals, etc. can also be deleted. The input information, signals, etc. can also be sent to other devices.

[0380] The notification of information is not limited to the methods / embodiments described in the present disclosure, and other methods can also be used. For example, the notification of information in the present disclosure can also be implemented through physical layer signaling (such as downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), higher layer signaling (such as Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0381] In addition, physical layer signaling can also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling can also be referred to as an RRC message, and can also be, for example, an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconfiguration (RRC connection re - setting (RRCConnection Reconfiguration)) message, etc. In addition, MAC signaling can also be notified, for example, using a MAC control element (MACControl Element (CE)).

[0382] In addition, the notification of specific information (such as the notification of "is X") is not limited to explicit notification, and can also be performed implicitly (such as by not performing the notification of the specific information, or by the notification of other information).

[0383] The determination can be made by a value represented by one bit (0 or 1), by a truth value (Boolean value) represented by true or false, or by a comparison of numerical values (e.g., comparison with a specific value).

[0384] Software, whether referred to as software, firmware, middleware, micro-code, hardware description language, or by any other name, should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, processes, functions, etc.

[0385] In addition, software, instructions, information, etc. can also be sent and received via a transmission medium. For example, in the case of sending software from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included in the definition of the transmission medium.

[0386] Terms such as "system" and "network" used in this disclosure can be used interchangeably. "Network" can also mean a device (e.g., a base station) included in the network.

[0387] In the present disclosure, terms such as "precoding", "precoder", "weights (precoding weights)", "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.

[0388] 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. There are also cases where base stations are referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0389] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within that coverage range.

[0390] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "user device (User Equipment (UE))", "terminal", etc. can be used interchangeably.

[0391] In some cases, the mobile station is also referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or several other appropriate terms.

[0392] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), may also be a moving body that moves in an unmanned manner (e.g., a drone, a self-driving vehicle, etc.), and may also be a robot (humanoid or non-humanoid). In addition, at least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0393] In addition, the base station in the present disclosure may also be interpreted as a user terminal. For example, for a structure in which communication between a base station and a user terminal is replaced by communication between multiple user terminals (e.g., may also be referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), the various methods / embodiments of the present disclosure may also be applied. In this case, it may also be configured such that the user terminal 20 has the functions of the above-described base station 10. In addition, expressions such as "uplink" and "downlink" may also be interpreted as expressions corresponding to inter-terminal communication (e.g., "side"). For example, an uplink channel, a downlink channel, etc. may also be interpreted as a side channel.

[0394] Similarly, the user terminal in the present disclosure may also be interpreted as a base station. In this case, it may also be configured such that the base station 10 has the functions of the above-described user terminal 20.

[0395] In the present disclosure, an action performed by a base station may sometimes be performed by its upper node according to circumstances. Apparently, in a network including one or more network nodes having a base station, various actions performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0396] Each mode / embodiment described in the present disclosure may be used alone, in combination, or switched during execution. In addition, the processing procedures, sequences, flowcharts, etc. of each mode / embodiment described in the present disclosure may be reordered as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented in an exemplary order, but are not limited to the specific order presented.

[0397] Each mode / embodiment described in the present disclosure can also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, the fourth generation mobile communication system (4G), the fifth generation mobile communication system (5G), the sixth generation mobile communication system (6G), the xth generation mobile communication system (xG) (where x is an integer or a decimal, for example), Future Radio Access (FRA), New Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, next-generation systems extended based on them, and the like. In addition, multiple systems can also be combined (for example, a combination of LTE or LTE-A and 5G) and applied.

[0398] 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".

[0399] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not fully define the quantity or order of these elements. These terms can be used in this disclosure as a convenient way to distinguish between more than two elements. Therefore, the reference to the first and second elements does not mean that only two elements can be adopted, or that the first element must be prior to the second element in a certain form.

[0400] The term "determining" used in this disclosure includes various actions in some cases. For example, "determining" can also be regarded as a case of "determining" actions such as judging, calculating, computing, processing, deriving, investigating, looking up (searching, inquiring) (such as searching in a table, database or other data structures), ascertaining, etc.

[0401] In addition, "determining" can also be regarded as a case of "determining" actions such as receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, accessing (for example, accessing data in a memory), etc.

[0402] In addition, "determining" can also be regarded as a case of "determining" actions such as resolving, selecting, choosing, establishing, comparing, etc. That is to say, "determining" can also be regarded as a case of "determining" some actions.

[0403] In addition, "determining" can also be interpreted as "assuming", "expecting", "considering", etc.

[0404] The "maximum transmit power" described in this disclosure can either mean the maximum value of the transmit power, or the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0405] As used in this disclosure, terms such as "connected" and "coupled", or any variations thereof, mean all direct or indirect connections or couplings between two or more elements, and can include the situation where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination of these. For example, "connected" can also be interpreted as "access".

[0406] In this disclosure, when connecting two elements, it can be considered that one or more wires, cables, printed electrical connections, etc. are used, and electromagnetic energy with wavelengths in the radio frequency range, microwave region, and optical (both visible and invisible) region, etc., are used as several non-limiting and non-inclusive examples to "connect" or "couple" to each other.

[0407] In this disclosure, a term such as "A is different from B" can also mean that "A and B are different from each other". Additionally, this term can also mean that "A and B are each different from C". Terms such as "separated" and "coupled" can be similarly interpreted as "different".

[0408] In this disclosure, when using "include", "including", and their variations, these terms, like the term "comprising", are meant to be inclusive. Further, the term "or" used in this disclosure does not mean exclusive or.

[0409] In this disclosure, for example, in the case where articles are added through translation such as a, an, and the in English, this disclosure can also include the case where the nouns following these articles are in the plural form.

[0410] Above, the invention related to this disclosure has been described in detail, but for those skilled in the art, the invention related to this disclosure is obviously not limited to the embodiments described in this disclosure. The invention related to this disclosure can be implemented in the form of amendments and changes without departing from the gist and scope of the present invention determined based on the description in the claims. Therefore, the description of this disclosure is for illustrative purposes and does not carry any restrictive meaning with respect to the invention related to this disclosure.

Claims

1. A terminal, comprising: a control unit that controls, when a scheduling offset of an aperiodic channel state information reference signal, i.e., an A-CSI-RS, is less than a threshold and there is a physical downlink shared channel, i.e., a PDSCH, having a scheduling offset of a quasi-co-location (QCL) time length or more in the same symbol as the A-CSI-RS, to use a first transmission control indication state, i.e., a first TCI state, of two indicated transmission control indication states, i.e., two TCI states, for the PDSCH for receiving the A-CSI-RS; and a receiving unit that receives the A-CSI-RS.

2. The terminal according to claim 1, wherein when there is no PDSCH in the same symbol as the A-CSI-RS, the control unit controls to use a first default TCI state of two default TCI states for the PDSCH for receiving the A-CSI-RS.

3. The terminal according to claim 2, wherein the two default TCI states are two TCI states corresponding to the lowest code point among one or more TCI code points including two TCI states.

4. A wireless communication method performed by a terminal, comprising: a step of controlling, when a scheduling offset of an aperiodic channel state information reference signal, i.e., an A-CSI-RS, is less than a threshold and there is a physical downlink shared channel, i.e., a PDSCH, having a scheduling offset of a quasi-co-location (QCL) time length or more in the same symbol as the A-CSI-RS, to use a first transmission control indication state, i.e., a first TCI state, of two indicated transmission control indication states, i.e., two TCI states, for the PDSCH for receiving the A-CSI-RS; and a step of receiving the A-CSI-RS.

5. A base station, comprising: a transmitting unit that transmits an aperiodic channel state information reference signal, i.e., an A-CSI-RS; and a control unit that controls, when a scheduling offset of the A-CSI-RS is less than a threshold and there is a physical downlink shared channel, i.e., a PDSCH, having a scheduling offset of a quasi-co-location (QCL) time length or more in the same symbol as the A-CSI-RS, to receive a report of the A-CSI-RS received using a first transmission control indication state, i.e., a first TCI state, of two indicated transmission control indication states, i.e., two TCI states, for the PDSCH.

6. A system having a terminal and a base station, wherein the terminal comprises: a control unit that controls, when a scheduling offset of an aperiodic channel state information reference signal, i.e., an A-CSI-RS, is less than a threshold and there is a physical downlink shared channel, i.e., a PDSCH, having a scheduling offset of a quasi-co-location (QCL) time length or more in the same symbol as the A-CSI-RS, to use a first transmission control indication state, i.e., a first TCI state, of two indicated transmission control indication states, i.e., two TCI states, for the PDSCH for receiving the A-CSI-RS; and A receiving unit that receives the A-CSI-RS, The base station has: A transmitting unit that transmits the A-CSI-RS.

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