Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure includes a reception unit that receives downlink control information (DCI) indicating a transmission configuration indication (TCI) state that can be applied in downlink and uplink, and a control unit that applies the TCI state at a timing based on the DCI. According to one embodiment of the present disclosure, information related to QCL can be appropriately determined.

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

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further higher-speed data rates, lower delay, and so on (Non-Patent Literature 1). Further, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further larger capacity, higher density, and so on of LTE (3rd Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] A subsequent system of LTE (for example, also referred to as 5th generation mobile communication system (5G), 5G (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 onwards, and so on) is also being studied.

[0004] PRIOR ART DOCUMENT

[0005] NON-PATENT LITERATURE

[0006] Non-Patent Literature 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

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In future wireless communication systems (e.g., NR), it is under study that a user terminal (terminal, user terminal (user terminal), User Equipment (UE)) controls transmission and reception processing based on information related to Quasi-Co-Location (QCL) (QCL assumption / Transmission Configuration Indication (TCI) state / space relation).

[0009] However, there is a case where the information related to QCL is not clear. If the information related to QCL is not clear, there is a concern that it leads to a decrease in communication quality, a decrease in throughput, and the like.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately decide information related to QCL.

[0011] Means for solving the problem

[0012] A terminal according to an aspect of the present disclosure includes a reception unit that receives downlink control information (DCI) indicating a Transmission Configuration Indication (TCI) state that can be applied in downlink and uplink, and a control unit that applies the TCI state at a timing based on the DCI.

[0013] Effects of the invention

[0014] According to an aspect of the present disclosure, it is possible to appropriately decide information related to QCL. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a diagram illustrating an example of a unified TCI framework.

[0016] Figure 2 is a diagram illustrating an example of a notification method of a unified TCI state.

[0017] Figure 3 is a diagram illustrating an example of a decision method of a TCI state according to the first embodiment.

[0018] Figure 4A and Figure 4B is a diagram illustrating an example of a decision method of a TCI state according to the second embodiment.

[0019] Figure 5 is a diagram illustrating an example of a decision method of a TCI state according to the first modification of the second embodiment.

[0020] Figure 6FIG. 6 is a diagram illustrating an example of a method of determining a TCI state according to a second embodiment.

[0021] Figure 7 FIG. 7 is a diagram illustrating an example of a common beam update according to Mode 3-1.

[0022] Figure 8 FIG. 8 is a diagram illustrating an example of a common beam update according to Mode 3-2.

[0023] Figure 9 FIG. 9 is a diagram illustrating an example of a common beam update according to Mode 3-3.

[0024] Figure 10 FIG. 10 is a diagram illustrating an example of a common beam update according to Mode 3-4.

[0025] Figure 11 FIG. 11 is a diagram illustrating an example of a common beam update according to Mode 3-5.

[0026] Figure 12 FIG. 12 is a diagram illustrating an example of a common beam update according to Mode 3-6.

[0027] Figure 13 FIG. 13 is a diagram illustrating an example of a correspondence between a codepoint of a TCI field and an activated TCI state according to a sixth embodiment.

[0028] Figure 14 FIG. 14 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment.

[0029] Figure 15 FIG. 15 is a diagram illustrating an example of a configuration of a base station according to an embodiment.

[0030] Figure 16 FIG. 16 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment.

[0031] Figure 17 FIG. 17 is a diagram illustrating an example of a hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION

[0032] (TCI, Spatial Relation, QCL)

[0033] In NR, it is under study to control at least one of 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 of a signal / channel based on a transmission configuration indication state (TCI state).

[0034] The TCI state can also indicate a state applied to a signal / channel of a downlink. A state equivalent to the TCI state applied to a signal / channel of an uplink can also be expressed as a spatial relation.

[0035] The TCI state refers to information related to 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 to a UE per channel or per signal.

[0036] The QCL is an index indicating a statistical property of a signal / channel. For example, in the case where a certain signal / channel and another signal / channel are QCLed, it can mean that at least one of a Doppler shift, a Doppler spread, an average delay, a delay spread, a spatial parameter (e.g., a spatial Rx parameter) can be assumed to be the same among the different signals / channels (at least one of which is QCLed).

[0037] In addition, the spatial reception parameter can also correspond to a receive beam (e.g., a receive analog beam) of a UE, and the beam can also be determined based on spatial QCL. The QCL (or at least one element of the QCL) in the disclosure can also be replaced with sQCL (spatial QCL).

[0038] The QCL can also be specified in various types (QCL types). For example, four QCL types A-D can be set to be able to assume different parameters (or sets of parameters) to be the same, and hereinafter, the parameters (which can also be referred to as QCL parameters) are denoted as follows:

[0039] • QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0040] • QCL Type B (QCL-B): Doppler shift and Doppler spread,

[0041] • QCL Type C (QCL-C): Doppler shift and average delay,

[0042] • QCL Type D (QCL-D): Spatial reception parameter.

[0043] The UE can also be referred to as a QCL assumption that a certain control resource set (CORESET), channel or reference signal is in a specific QCL relationship (e.g., QCL Type D) with other CORESETs, channels or reference signals.

[0044] The UE can also decide at least one of a transmission beam (Tx beam) and a reception beam (Rx beam) of the signal / channel based on the TCI state or the QCL assumption of the signal / channel.

[0045] The TCI state can also be information related to QCL of a channel (in other words, a reference signal (RS) for the channel) that is an object and other signals (e.g., other RSs), for example. The TCI state can also be configured (indicated) through higher layer signaling, physical layer signaling, or a combination thereof.

[0046] The physical layer signaling can also be downlink control information (Downlink Control Information (DCI)), for example.

[0047] The channel for which the TCI state or spatial relation is configured (specified) can also be at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)), for example.

[0048] Further, the RS in the QCL relationship with the channel can also be at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a measurement reference signal (sounding reference signal (SRS)), a tracking CSI-RS (also referred to as a tracking reference signal (TRS)), and a QCL detection reference signal (also referred to as a QRS), for example.

[0049] The SSB is a signal block including at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel (physical broadcast channel (PBCH)). The SSB can also be referred to as an SS / PBCH block.

[0050] The RS of the QCL type X of the TCI state can also mean a RS in a QCL type X relationship with (the DMRS of) a certain channel / signal, which can also be referred to as a QCL source of the QCL type X of the TCI state.

[0051] (Path loss RS)

[0052] Path loss PL in the transmission power control of PUSCH, PUCCH, and SRS, respectively b，f，c (q d [dB] index q of a reference signal (RS, path loss reference RS) of a downlink BWP associated with the active UL BWP b of the carrier f of the serving cell c d is calculated by the UE. In the present disclosure, the path loss reference RS, path loss (PL)-RS, index q d , the RS used in the path loss calculation, and the RS resource used in the path loss calculation can also be replaced with each other. In the present disclosure, calculation, estimation, measurement, and tracking can also be replaced with each other.

[0053] It is being studied whether or not to change the existing mechanism of a higher layer filtered RSRP for path loss measurement in the case where the path loss RS is updated by a MAC CE.

[0054] In a case where the path loss RS is updated by the MAC CE, the L1-RSRP based path loss measurement can also be applied. Also, at a timing at which the MAC CE for the update of the path loss RS is available, the higher layer filtered RSRP can be used for the path loss measurement, and before the higher layer filtered RSRP is applied, the L1-RSRP is used for the path loss measurement. At the timing at which the MAC CE for the update of the path loss RS is available, the higher layer filtered RSRP can also be used for the path loss measurement, and before that timing, the higher layer filtered RSRP of the previous path loss RS is used. As with the operation of Rel. 15, the higher layer filtered RSRP is used for the path loss measurement, and the UE can also track all path loss RS candidates set by RRC. The maximum number of path loss RSs that can be set by RRC can also depend on the UE capability. In a case where the maximum number of path loss RSs that can be set by RRC is X, path loss RS candidates below X can also be set by RRC, and the path loss RS is selected by the MAC CE from the set path loss RS candidates. The maximum number of path loss RSs that can be set by RRC can also be 4, 8, 16, 64, etc.

[0055] In the present disclosure, the higher layer filtered RSRP, the filtered RSRP, the layer 3 filtered RSRP can also be replaced with each other.

[0056] (Default TCI state / default spatial relation / default PL-RS)

[0057] In the RRC connected mode, in both a case where the TCI information in DCI (higher layer parameter TCI-PresentInDCI) is set to "valid (enabled)" and a case where the TCI information in DCI is not set, in a case where the time offset between the reception of the DL DCI (DCI scheduling the PDSCH) and the corresponding PDSCH (PDSCH scheduled by the DCI) is less than the threshold (timeDurationForQCL) (application condition, first condition), in a 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 slot in the active DL BWP of the (specific UL signal) CC. In a case other than this, the TCI state of the PDSCH (default TCI state) can also be the TCI state of the lowest TCI state ID of the PDSCH in the active DL BWP of the scheduled CC.

[0058] In Rel. 15, each MAC CE for activation / deactivation of PUCCH spatial relation and MAC CE for activation / deactivation of SRS spatial relation is needed. PUSCH spatial relation follows SRS spatial relation.

[0059] In Rel. 16, at least one of MAC CE for activation / deactivation of PUCCH spatial relation and MAC CE for activation / deactivation of SRS spatial relation can not be used.

[0060] In the case where neither of spatial relation and PL-RS for PUCCH is set in FR2 (application condition, second condition), default assumption of spatial relation and PL-RS (default spatial relation and default PL-RS) is applied to PUCCH. In the case where neither of spatial relation and PL-RS for SRS (SRS resource for SRS, or SRS resource corresponding to SRI in DCI format 0_1 scheduling PUSCH) is set in FR2 (application condition, second condition), default assumption of spatial relation and PL-RS (default spatial relation and default PL-RS) is applied to PUSCH and SRS scheduled by DCI format 0_1.

[0061] In the case where CORESET is set within the activated DL BWP on the CC (application condition), default spatial relation and default PL-RS can also be TCI state or QCL assumption of CORESET with the lowest CORESET ID within the activated DL BWP. In the case where CORESET is not set within the activated DL BWP on the CC, default spatial relation and default PL-RS can also be activated TCI state with the lowest ID of PDSCH within the activated DL BWP.

[0062] In Rel. 15, spatial relation of PUSCH scheduled by DCI format 0_0 follows spatial relation of PUCCH resource with the lowest PUCCH resource ID in activated spatial relation of PUCCH on the same CC. Even in the case where PUCCH is not transmitted on SCell, network needs to update PUCCH spatial relation on all SCells.

[0063] In Rel. 16, PUCCH setting for PUSCH scheduled by DCI format 0_0 is not needed. In the case where neither of activated PUCCH spatial relation or PUCCH resource is set on activated UL BWP within the CC (application condition, second condition) for PUSCH scheduled by DCI format 0_0, default spatial relation and default PL-RS are applied to the PUSCH.

[0064] The application condition for the default spatial relation / default PL-RS for SRS can also contain that a SRS default beam pathloss activation information element (higher layer parameter enableDefaultBeamPlForSRS) is set to be valid. The application condition for the default spatial relation / default PL-RS for PUCCH can also contain that a PUCCH default beam pathloss activation information element (higher layer parameter enableDefaultBeamPlForPUCCH) is set to be valid. The application condition for the default spatial relation / default PL-RS for PUSCH scheduled by DCI format 0_0 can also contain that a PUSCH default beam pathloss activation information element (higher layer parameter enableDefaultBeamPlForPUSCH0_0) for PUSCH scheduled by DCI format 0_0 is set to be valid.

[0065] The above threshold can also be referred to as 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 (scheduling) offset threshold, and the like.

[0066] (Multi-TRP)

[0067] In NR, it is under study that one or more Transmission / Reception Points (TRPs) (multi-TRP (M-TRP)) use one or more panels (multi-panel) to perform DL transmission to a UE. In addition, it is under study that a UE uses one or more panels to perform UL transmission to one or more TRPs.

[0068] In addition, the multiple TRPs can correspond to the same cell identifier (cell Identifier (ID)) or different cell IDs. The cell ID can be a physical cell ID or a virtual cell ID.

[0069] The multiple TRPs (e.g., TRP #1, #2) can also be connected through ideal / non-ideal backhaul and exchange information, data, etc. Different code words (Code Word (CW)) and different layers can also be transmitted from each of the multiple TRPs, respectively. As one way of multiple TRP transmission, Non-Coherent Joint Transmission (NCJT) can also be used.

[0070] In NCJT, for example, TRP #1 modulates and maps a first code word and performs layer mapping to transmit a first PDSCH using a first precoding for a first number of layers (e.g., 2 layers). In addition, TRP #2 modulates and maps a second code word and performs layer mapping to transmit a second PDSCH using a second precoding for a second number of layers (e.g., 2 layers).

[0071] In addition, the multiple PDSCHs (multi-PDSCH) by NCJT can also be defined as partially or completely overlapping in at least one of the time domain and the frequency domain. That is, at least one of the time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP can overlap.

[0072] The first PDSCH and the second PDSCH can also be assumed to be not quasi-co-located. The reception of the multiple PDSCHs can also be replaced with the simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).

[0073] The multiple PDSCHs (which can also be referred to as multiple PDSCHs (multiple PDSCH)) from the multiple TRPs can be scheduled using one DCI (single DCI, single PDCCH) (single master mode, single-DCI based multi-TRP). The multiple PDSCHs from the multiple TRPs can also be scheduled using multiple DCIs (multi-DCI, multiple PDCCH) (multi-master mode, multi-DCI based multi-TRP), respectively.

[0074] According to such a multiple TRP scenario, more flexible transmission control using a good quality channel can be performed.

[0075] To support intra-cell (intra-cell, with the same cell ID) and inter-cell (inter-cell, with different cell IDs) multi-TRP transmission based on multiple PDCCHs, in the RRC configuration information for linking multiple pairs of PDCCHs and PDSCHs with multiple TRPs, one control resource set (CORESET) within the PDCCH configuration information (PDCCH-Config) can also correspond to one TRP.

[0076] (CSI)

[0077] In NR, the UE uses a reference signal (or the resource for the reference signal) to measure the channel state, and feeds back (reports) the channel state information (Channel State Information (CSI)) to the network (for example, the base station).

[0078] The UE can also use at least one of the channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), the synchronization signal / broadcast channel (Synchronization Signal / Physical Broadcast Channel (SS / PBCH)) block, the synchronization signal (Synchronization Signal (SS)), the demodulation reference signal (DeModulation Reference Signal (DMRS)), etc. to measure the channel state.

[0079] The CSI-RS resource can also contain at least one of the non-zero power (Non Zero Power (NZP)) CSI-RS resource, the zero power (Zero Power (ZP)) CSI-RS resource, and the CSI interference measurement (CSI Interference Measurement (CSI-IM)) resource.

[0080] The resource for measuring the signal component for CSI can also be referred to as a signal measurement resource (Signal Measurement Resource (SMR)), a channel measurement resource (Channel Measurement Resource (CMR)). The SMR (CMR) can also contain, for example, the NZP CSI-RS resource for channel measurement, the SSB, etc.

[0081] The resource for measuring the interference component for the CSI can also be referred to as an Interference Measurement Resource (IMR). The IMR can also contain at least one of an NZP CSI-RS resource, an SSB, a ZP CSI-RS resource, and a CSI-IM resource for interference measurement, for example.

[0082] The SS / PBCH block is a block containing a synchronization signal (e.g., a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS)), and a PBCH (and a corresponding DMRS), and can also be referred to as an SS block (SSB), etc.

[0083] In addition, the CSI can also contain 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 L1-RSRP (Layer 1 Reference Signal Received Power), a L1-RSRQ (Reference Signal Received Quality), a L1-SINR (Signal to Interference plus Noise Ratio), a L1-SNR (Signal to Noise Ratio), etc.

[0084] The CSI can also have multiple parts. The CSI part 1 can contain information (e.g., an RI) having a relatively small number of bits. The CSI part 2 can contain information (e.g., a CQI) having a relatively large number of bits determined based on the CSI part 1, etc.

[0085] Further, the CSI can also be classified into several CSI types. The kind of information to be reported, the size, and the like can also differ depending on the CSI type. For example, it is also possible to define a CSI type set for communication using a single beam (also referred to as type I CSI, single-beam CSI, or the like) and a CSI type set for communication using multiple beams (also referred to as type II CSI, multi-beam CSI, or the like). The use of the CSI type is not limited to this.

[0086] As a feedback method of the CSI, a periodic CSI (P-CSI) report, an aperiodic CSI (A-CSI, AP-CSI) report, a semi-persistent CSI (SP-CSI) report, and the like are being studied.

[0087] The UE can also be notified of the CSI measurement setting information using high layer signaling, physical layer signaling, or a combination thereof.

[0088] In the present disclosure, the high layer signaling can be, for example, any one of or a combination of radio resource control (RRC) signaling, medium access control (MAC) signaling, broadcast information, and the like.

[0089] The MAC signaling can be, for example, a MAC control element (MAC CE), a MAC protocol data unit (PDU), or the like. The broadcast information can be, for example, a master information block (MIB), a system information block (SIB), remaining minimum system information (RMSI), other system information (OSI), or the like.

[0090] The physical layer signaling can be, for example, downlink control information (DCI).

[0091] The CSI measurement configuration information can 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"), and the like. The CSI resource configuration information is associated with resources used for CSI measurement, and the CSI report configuration information is associated with how the UE implements CSI reporting.

[0092] The RRC information elements (or RRC parameters) related to the CSI report configuration and the CSI resource configuration are described.

[0093] The CSI report configuration information ("CSI-ReportConfig") includes resource information for channel measurement ("resourcesForChannelMeasurement"). In addition, the CSI report configuration information can also include resource information for interference measurement (for example, NZP CSI-RS resource information for interference measurement ("nzp-CSI-RS-ResourcesForInterference"), CSI-IM resource information for interference measurement ("csi-IM-ResourcesForInterference"), and the like). These resource information correspond to the ID (Identifier) of the CSI resource configuration information ("CSI-ResourceConfigId").

[0094] In addition, with respect to the ID of the CSI resource configuration information corresponding to each resource information (which can also be referred to as the CSI resource configuration ID), it can be either one or more of the same value, or it can be a different value for each.

[0095] The CSI resource configuration information ("CSI-ResourceConfig") can also include a CSI resource configuration information ID, CSI-RS resource set list information ("csi-RS-ResourceSetList"), resource type ("resourceType"), and the like. The CSI-RS resource set list can include at least one of information for measurement of NZP CSI-RS and SSB ("nzp-CSI-RS-SSB") and CSI-IM resource set list information ("csi-IM-ResourceSetList").

[0096] The resource type indicates the behavior of the time domain of the resource, and can be set to "aperiodic", "semi-persistent", or "periodic". For example, the corresponding CSI-RS can also be referred to as A-CSI-RS (AP-CSI-RS), SP-CSI-RS, and P-CSI-RS, respectively.

[0097] In addition, the channel measurement resource can also be used for calculation of CQI, PMI, L1-RSRP, and the like. In addition, the interference measurement resource can also be used for calculation of L1-SINR, L1-SNR, L1-RSRQ, and other interference-related indicators.

[0098] (Unified TCI framework)

[0099] Research is being conducted on using the same TCI state in both UL and DL channels.

[0100] In the example of Figure 1 , the TCI state containing the DL-RS is used for QCL assumption of PDCCH / PDSCH / CSI-RS, spatial relation of SRS / PUCCH, and spatial relation of PUSCH.

[0101] Research is being conducted on using RRC / MAC-CE / DCI in the selection of one TCI state for UL / DL.

[0102] In the example of Figure 2 , multiple DL unified TCI states are set by RRC, and multiple UL unified TCI states are set by RRC. Each of the multiple DL unified TCI states and the multiple UL unified TCI states can also be SSB, CSI-RS, or SRS.

[0103] Part of the DL unified TCI state set by RRC is activated as a DL unified TCI state by MAC CE. Part of the DL unified TCI state set by RRC is activated as an UL unified TCI state by MAC CE. Part of the UL unified TCI state set by RRC is activated as an UL unified TCI state by MAC CE. Part of the DL unified TCI state activated by MAC CE is indicated by DCI. Part of the UL unified TCI state activated by MAC CE is indicated by DCI.

[0104] According to the unified TCI framework, it is possible to control channels of UL as well as DL by a common framework. The unified TCI framework does not specify a TCI state or a spatial relation per channel as in Rel. 15, and it is possible to indicate a common beam and apply it to all channels of UL as well as DL, or to apply a common beam for UL to all channels of UL and to apply a common beam for DL to all channels of DL.

[0105] However, the timing of application of the TCI state is not clear. If the timing is not clear, there is a concern that a bias occurs between the UE and the base station, which leads to degradation of communication quality, degradation of throughput, and the like.

[0106] Therefore, the inventors of the present disclosure conceived of a method of determining a TCI state.

[0107] Hereinafter, embodiments related to the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication method related to each embodiment can be applied individually or in combination.

[0108] In the present disclosure, "A / B / C", "at least one of A, B, and C" can be replaced with each other. In the present disclosure, a cell, a CC, a carrier, a BWP, a DL BWP, a UL BWP, an activated DL BWP, an activated UL BWP, a band can be replaced with each other. In the present disclosure, an index, an ID, an indicator, a resource ID can be replaced with each other. In the present disclosure, support, control, can control, operate, can operate can be replaced with each other.

[0109] In the present disclosure, configure, activate, update, indicate, enable, specify, select can be replaced with each other.

[0110] In the present disclosure, a MAC CE, an activation / deactivation command can be replaced with each other.

[0111] In the present disclosure, higher layer signaling, for example, can be any one or a combination of radio resource control (RRC) signaling, medium access control (MAC) signaling, broadcast information, and the like. In the present disclosure, RRC, RRC signaling, RRC parameter, higher layer, higher layer parameter, RRC information element (IE), RRC message can be replaced with each other.

[0112] The MAC signaling can be, for example, a MAC control element (MAC CE), a MAC protocol data unit (PDU), and the like. The broadcast information can be, for example, a master information block (MIB), a system information block (SIB), remaining minimum system information (RMSI), other system information (OSI), and the like.

[0113] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, QCL assumption, QCL parameter, spatial domain reception filter, UE spatial domain reception filter, UE reception beam, DL beam, DL reception beam, DL precoding, DL precoder, DL-RS, RS of QCL Type D of TCI state / QCL assumption, RS of QCL Type A of TCI state / QCL assumption, spatial relation, spatial domain transmission filter, UE spatial domain transmission filter, UE transmission beam, UL beam, UL transmission beam, UL precoding, UL precoder, PL-RS can be replaced with each other. In the present disclosure, QCL Type X-RS, DL-RS associated with QCL Type X, DL-RS with QCL Type X, source of DL-RS, SSB, CSI-RS, SRS can be replaced with each other.

[0114] UL DCI, DCI scheduling UL channel (PUSCH), DCI format 0_x (x = 0, 1, 2,...) can be replaced with each other. DL DCI, DCI scheduling DL channel (PDSCH), DCI format 1_x (x = 0, 1, 2,...) can be replaced with each other.

[0115] In the present disclosure, HARQ-ACK information, ACK, NACK can be replaced with each other.

[0116] In the present disclosure, single-TRP, single-TRP system, single-TRP transmission, single-PDSCH can be replaced with each other. In the present disclosure, multi-TRP, multi-TRP system, multi-TRP transmission, multi-PDSCH can be replaced with each other. In the present disclosure, single-DCI, single-PDCCH, multi-TRP based on single-DCI, two TCI states on at least one TCI codepoint activated can be replaced with each other.

[0117] In the present disclosure, single-TRP, channel using single-TRP, channel using one TCI state / spatial relation, multi-TRP not activated by RRC / DCI, multiple TCI states / spatial relations not activated by RRC / DCI, CORESET pool index (CORESETPoolIndex) value not set to 1 for any CORESET, and any codepoint of TCI field not mapped to two TCI states can be replaced with each other.

[0118] In the present disclosure, multi-TRP, channel using multi-TRP, channel using multiple TCI states / spatial relations, multi-TRP activated by RRC / DCI, multiple TCI states / spatial relations activated by RRC / DCI, at least one of multi-TRP based on single-DCI and multi-TRP based on multi-DCI can be replaced with each other. In the present disclosure, multi-TRP based on multi-DCI, CORESET pool index (CORESETPoolIndex) value set to 1 for CORESET can be replaced with each other. In the present disclosure, multi-TRP based on single-DCI, at least one codepoint of TCI field mapped to two TCI states can be replaced with each other.

[0119] In the present disclosure, CSI-RS, NZP-CSI-RS, periodic (P)-CSI-RS, P-TRS, semi-persistent (SP)-CSI-RS, aperiodic (A)-CSI-RS, TRS, CSI-RS with TRS information (higher layer parameter trs-Info), NZP CSI-RS resource within NZP CSI-RS resource set with TRS information can be replaced with each other. In the present disclosure, CSI-RS resource, CSI-RS resource set, CSI-RS resource group, information element (IE) can be replaced with each other.

[0120] (Wireless communication method)

[0121] In the present disclosure, pool, set, group, list can be replaced with each other.

[0122] In the present disclosure, the common beam, the unified TCI state, the beam applicable in DL and UL, the beam applied in multiple channels, the PL-RS can also be replaced with each other.

[0123] <First Embodiment>

[0124] The UE can also assume the same TCI state pool for UL and DL.

[0125] The RRC (parameter, information element) can also configure multiple TCI states (pools) for UL / DL channels.

[0126] The MAC CE can also select (activate) one or more (e.g., multiple) TCI states (sets) for UL / DL channels.

[0127] The UL / DL DCI can also select (indicate) one or more (e.g., one) TCI state. The TCI state can also be applied to multiple UL / DL channels. The UL / DL channels can also be PDCCH / PDSCH / PUSCH / SRS / PUCCH.

[0128] The UL / DL DCI can also include a new TCI field. The UL / DL DCI can also be at least one of DCI formats 0_1, 0_2, 1_1, 1_2. The new TCI field can also select at least one (e.g., one) of multiple activated TCI states.

[0129] In the case where the new TCI field exists within the DCI format 1_1, 1_2, the TCI field of Rel. 15 / 16 can also not exist within the DCI format 1_1, 1_2.

[0130] The presence of the new TCI field within the DCI can also be configured by higher layers. The presence of the new DCI field within the UL DCI and the presence of the new DCI field within the DL DCI can be configured independently (separately). The presence of the new DCI field within the UL DCI and the presence of the new DCI field within the DL DCI can also be configured jointly.

[0131] The size (number of bits) of the TCI field can be the same or different in the UL DCI and the DL DCI. For example, the size of the TCI field in the DL DCI can also be greater than the size of the TCI field in the UL DCI.

[0132] In the case where the new TCI field exists within the DCI format 1_1, 1_2, the TCI field of Rel. 15 / 16 can also not exist within the DCI format 1_1, 1_2. Figure 3In the example of FIG. 1, the RRC configures multiple TCI states for DL and UL. Each of the multiple TCI states can also be an SSB, a CSI-RS, or an SRS. The MAC CE activates a part of the configured multiple TCI states. The DCI indicates at least one of the activated multiple TCI states.

[0133] The indicated TCI state is applied to multiple UL / DL channels. The UL / DL channels can also be PDCCH / PDSCH / PUSCH / SRS / PUCCH.

[0134] The default beam for UL and DL can also be aligned by MAC CE based beam management. The default TCI state for PDSCH can also be updated in coordination with the default UL beam (spatial relation).

[0135] A common beam / unified TCI state can also be indicated for both UL and DL from the same TCI state pool by DCI based beam management. M (>1) TCI states can also be activated by MAC CE. The UL / DL DCI can also select one from the M activated TCI states. The selected TCI state can also be applied to the channels / RSs for both UL and DL.

[0136] According to the first embodiment above, the TCI states configured in one pool can be used for the channels of UL and DL.

[0137] <Second Embodiment>

[0138] The UE can also assume different TCI state pools for each of UL and DL.

[0139] The RRC (parameters, information elements) can also configure multiple TCI states (pools) for each of UL and DL channels.

[0140] The MAC CE can also select (activate) more than one (e.g., multiple) TCI states (sets) for each of UL and DL channels. The MAC CE can also activate two sets of TCI states.

[0141] One MAC CE format can also be specified for both DL and UL. One MAC CE (one transmission) can also indicate two sets of TCI states. The two sets of TCI states can also be for DL and UL, respectively. Two MAC CEs (two transmissions) can also indicate a set of TCI states for DL and a set of TCI states for UL, respectively. Each MAC CE can also contain a 1-bit field indicating whether it is for DL or UL.

[0142] Different MAC CE formats can also be specified for DL and UL.

[0143] DL DCI can also select (indicate) one or more (e.g., one) TCI state(s). The TCI state(s) can also be applied to one or more DL channels. The DL channels can also be PDCCH / PDSCH / CSI-RS.

[0144] UL DCI selects (indicates) one or more (e.g., one) TCI state(s). The TCI state(s) can also be applied to one or more UL channels. The UL channels can also be PUSCH / SRS / PUCCH.

[0145] UL / DL DCI can also contain a new TCI field. The UL / DL DCI can also be at least one of DCI format 0_1, 0_2, 1_1, 1_2. The new TCI field can also select at least one (e.g., one) of multiple activated TCI states.

[0146] In case the new TCI field is present within DCI format 1_1, 1_2, the TCI field of Rel. 15 / 16 can also not be present within DCI format 1_1, 1_2. The new TCI field can also not be present in DCI format 1_1, 1_2. The existing TCI field can also be re-used for the indication of TCI state(s) of this implementation.

[0147] The presence of the new TCI field within DCI can also be configured by higher layers. The presence of the new DCI field within UL DCI and the presence of the new DCI field within DL DCI can also be configured independently (separately). The presence of the new DCI field within UL DCI and the presence of the new DCI field within DL DCI can also be configured jointly.

[0148] The size (number of bits) of the TCI field can be the same or different in UL DCI and DL DCI. For example, the size of the TCI field in DL DCI can also be larger than the size of the TCI field in UL DCI.

[0149] At least one of the presence and size of the TCI field within DCI can also be determined by the number of TCI states activated by MAC CE.

[0150] In Figure 4AIn an example, the RRC configures multiple TCI states for DL. Each TCI state can also be SSB, CSI-RS, or SRS. The MAC CE activates multiple TCI states for DL from the configured multiple TCI states for DL. The DL DCI indicates at least one of the activated multiple TCI states for DL. The indicated TCI state for DL is applied to the DL channel. The DL channel can also be CSI-RS / PDCCH / PDSCH.

[0151] In Figure 4B In an example, the RRC configures multiple TCI states for UL. Each TCI state can also be SSB, CSI-RS, or SRS. The MAC CE activates multiple TCI states for UL from the configured multiple TCI states for UL. The UL DCI indicates at least one of the activated multiple TCI states for UL. The indicated TCI state for UL is applied to the UL channel. The UL channel can also be PUCCH / PUSCH.

[0152]

[0153] The RRC can also configure a pool of TCI states common for UL and DL. More than one TCI state for DL can also be activated from the common pool, and more than one TCI state for UL can also be activated.

[0154] In Figure 5 In an example, the RRC configures multiple TCI states for DL and UL. Each TCI state can also be SSB, CSI-RS, or SRS.

[0155] The first MAC CE activates multiple TCI states for DL from the configured multiple TCI states. The DL DCI indicates at least one of the activated multiple TCI states for DL. The indicated TCI state for DL is applied to the DL channel. The DL channel can also be CSI-RS / PDCCH / PDSCH.

[0156] The second MAC CE activates multiple TCI states for UL from the configured multiple TCI states. The UL DCI indicates at least one of the activated multiple TCI states for UL. The indicated TCI state for UL is applied to the UL channel. The UL channel can also be PUCCH / PUSCH.

[0157]

[0158] More than one TCI state for DL and more than one TCI state for UL can also be independently indicated from the activated multiple TCI states. The UL DCI and the DL DCI can also indicate different TCI states. ​​

[0159] In Figure 6 In the example of the above, the RRC sets multiple TCI states for DL and UL. Each TCI state can also be SSB, CSI-RS, or SRS. The MAC CE activates multiple TCI states among the set multiple TCI states.

[0160] The DL DCI indicates at least one DL TCI state of the activated multiple TCI states. The indicated DL TCI state is applied to the DL channel. The DL channel can also be CSI-RS / PDCCH / PDSCH.

[0161] The UL DCI indicates at least one UL TCI state of the activated multiple TCI states. The indicated UL TCI state is applied to the UL channel. The UL channel can also be PUCCH / PUSCH.

[0162] According to the above second embodiment, the DL TCI state and the UL TCI state can be appropriately decided.

[0163] <Third Embodiment>

[0164] The UE can also receive the DCI indicating the unified / common TCI state and apply the indicated TCI state at the beam update timing based on the DCI.

[0165] The UE can also apply the indicated TCI state to the first channel (one or more channels / RSs / resources) at the first timing (Timing #1). The UE can also apply the indicated TCI state to the second channel (one or more channels / RSs / resources) at the second timing (Timing #2) after the first timing. The UE can also apply the indicated TCI state to the third channel (one or more channels / RSs / resources) at the third timing (Timing #3) after the second timing.

[0166] The beam update timing can also follow at least one of the following ways 3-1 to 3-6.

[0167] 《Way 3-1》

[0168] The DCI can also update the common beam for DL and UL at at least one of the timing of the reception of the scheduled PDSCH, the transmission of the HARQ-ACK information corresponding thereto, and the transmission of the scheduled PUSCH. The update timing of the beam can also be the same as Rel. 15.

[0169] The common beam can also be updated after a certain time from the last symbol of the reception of the DCI. The certain time can also be K symbols or K slots. K can be specified by the specification, set by the higher layer, and reported by the UE as the UE capability.

[0170] In Figure 7 the example of FIG. 11, the DCI indicates TCI state #2 among the multiple activated TCI states. The UE updates the common beam to TCI state #2 at K symbols after the last symbol of the reception of the DCI (timing #1). Thereafter, TCI state #2 is used in the TCI state of the reception of the PDSCH and the spatial relation of the transmission of the PUCCH containing the HARQ-ACK information corresponding thereto. For the TCI state of this PUCCH, a new DCI field for the beam indication of the DCI level is not needed.

[0171] Method 3-2

[0172] In the case of a failure in the reception of the DCI, the base station assumes that the common beam is updated, and the UE assumes that the common beam is not updated. In the case of a failure in the reception of the DCI that schedules the PDSCH, whether the base station can reschedule the PDSCH becomes a problem.

[0173] In the case where there is a possibility of retransmission of the PDSCH / PUSCH, the UE can also monitor the DCI using the beam before the update.

[0174] At the timing of the reception of the PDSCH, the common beam assumption can also be updated in addition to the reception of the DCI where there is a possibility of scheduling retransmission.

[0175] Here, how to identify the DCI where there is a possibility of scheduling retransmission becomes a problem.

[0176] The DCI that schedules the initial transmission and retransmission can also use the same CORESET / search space / QCL assumption / TCI state.

[0177] Figure 8 The DCI, PDSCH, PUCCH in the example of FIG. 11 are the same as in Figure 7 In this example, at timing #1, all the common beams are updated except for the CORESET scheduled for the PDSCH (DCI where there is a possibility of scheduling retransmission), and at timing #2 after the UE transmits the PUCCH containing the ACK or NACK corresponding to the PDSCH, the beam of the CORESET scheduled for the PDSCH is updated to the common beam.

[0178] Method 3-3

[0179] Different beam update timings can also be applied for the PDCCH and others.

[0180] The UE can also assume at least one of the following assumptions 1 to 4.

[0181] [Assumption 1]

[0182] A TCI field in DCI format 1_1 / 1_2 indicates the common beam used by both DL and UL, or the common beam used only by DL.

[0183] [Scenario 2]

[0184] A TCI field within DCI format 0_1 / 0_2 indicates the common beam used by both DL and UL, or the common beam used only by UL.

[0185] [Scenario 3]

[0186] When using independent common beams for DL ​​and UL applications, the two TCI fields in DCI format 1_1 / 1_2 indicate the common beam for DL ​​and the common beam for UL applications, respectively.

[0187] [Scenario 4]

[0188] When using independent common beams for DL ​​and UL applications, the two TCI fields in DCI format 0_1 / 0_2 indicate the common beam for DL ​​and the common beam for UL applications, respectively.

[0189] Figure 9 The examples include DCI, PDSCH, and PUCCH. Figure 7 Same. In this example, at timing #1, the common beam other than the PDCCH is updated. At timing #2, the PDCCH beam is updated to this common beam.

[0190] Methods 3-4

[0191] The indicated TCI state can also be used for PDSCH reception. This TCI state can also be indicated through a new TCI field. If the scheduling offset (time offset) between the DCI and the PDSCH scheduled through the DCI is less than a threshold (e.g., timeDurationForQCL), the default DL beam (TCI state) (same as Rel.15) can also be applied for PDSCH reception.

[0192] For PUCCH, the indicated TCI state, previous common TCI state, or established spatial relationship can also be applied.

[0193] In this case, there will be no beam divergence between the UE and the base station.

[0194] Figure 10 The examples include DCI, PDSCH, and PUCCH. Figure 7The same. In this example, the TCI state #2 indicated by the DCI is applied to the PDSCH reception, and the common beam is updated after the PUCCH transmission (timing #1).

[0195] Way 3-5

[0196] The common beam for all channels can also be updated after the UE transmits the HARQ-ACK information. For the PDSCH, DCI-level beam updating can also not be possible.

[0197] In order to enable DCI-level beam updating for the PDSCH, the TCI field of Rel. 15 can also be re-used. The TCI field of Rel. 15 can also be applied only to the scheduled PDSCH. A new TCI field can be applied to all channels.

[0198] Figure 11 DCI, PDSCH, PUCCH, and Figure 7 The same. In this example, the common beam for all channels / RS is updated after the PUCCH transmission (timing #1).

[0199] Way 3-6

[0200] At least one of ways 3-1 to 3-5 can also be applied to the PUSCH. In at least one of ways 3-1 to 3-5, the PDSCH reception can also be replaced by the PUSCH transmission, and the HARQ-ACK information (PUCCH) transmission can also be replaced by the PUSCH transmission.

[0201] Figure 12 A case where way 3-4 is applied to the PUSCH is shown. In this example, the DCI indicates the TCI state #2 among multiple activated TCI states. The DCI schedules the PUSCH. The UE applies the indicated TCI state to the PUSCH transmission. The common beam is updated after the PUSCH transmission (timing #1).

[0202] According to the above third embodiment, it is possible to make the identification of DL / UL beams consistent between the UE and the base station.

[0203] <Fourth Embodiment>

[0204] In ways 3-1 to 3-4, the beam of the PDSCH is updated by the DCI that schedules it. The UE needs to assume a QCL assumption for buffering the received signal, but before the DCI decoding, the UE does not know whether the PDSCH is scheduled or not.

[0205] The UE can also assume (the same as Rel. 15) a default DL beam (default TCI state of PDSCH) for buffering reception signals. The UE can also apply the default TCI state in reception from reception of DCI to beam update timing.

[0206] According to the above fourth embodiment, even in a case where a beam is indicated by DCI that schedules a PDSCH, the UE can appropriately receive the PDSCH.

[0207] < Fifth Embodiment >

[0208] At least one of the first to fourth embodiments can also be applied to a specific CORESET.

[0209] The specific CORESET can also be all CORESETs.

[0210] The specific CORESET can also be all CORESETs having a TCI state. At least one of the first to fourth embodiments can also not be applied to CORESET0 that does not have a TCI state setting. CORESET0 can also be used for fallback to beam management of Rel. 15 / 16.

[0211] The specific CORESET can also be a CORESET other than CORESET0. At least one of the first to fourth embodiments can also not be applied to CORESET0.

[0212] The specific CORESET can also be a CORESET (single-TRP CORESET) other than a CORESET that is set to a multi-TRP (CORESET pool index, CORESET pool index of "1"). At least one of the first to fourth embodiments can also not be applied to a CORESET that is set to a multi-TRP. The unified TCI framework can also be applied to a single-TRP.

[0213] According to the above fifth embodiment, the UE can apply a common beam with respect to an appropriate CORESET.

[0214] < Sixth Embodiment >

[0215] In a case where the new TCI field is applied to a plurality or all of channels of UL / DL, the common beam can also not need to be updated at all timing of DCI reception.

[0216] The codepoint of the new TCI field can also include a no-update state. In a case where the no-update state is indicated by DCI, the UE can maintain the common beam. The no-update state can also be determined by a specific codepoint. The specific codepoint can be 000, or can be set by a higher layer.

[0217] In Figure 13 In the example of the above, the activated TCI states #1 to #7 in the common activated TCI state pool are respectively associated with the codepoints 001 to 111 of the new TCI field. In a case where the new TCI field indicates any one of the codepoints 001 to 111, the UE updates the common beam to the TCI state corresponding to the codepoint. The specific codepoint 000 is associated with the no update state. In a case where the new TCI field indicates the codepoint 000, the UE maintains the common beam.

[0218] According to the above sixth embodiment, whether or not to update the common beam is appropriately indicated.

[0219] <Seventh Embodiment>

[0220] A UE capability corresponding to the at least one function (feature) in the first to sixth embodiments can also be specified. In a case where the UE reports the UE capability, the UE can also perform the corresponding function. In a case where the UE reports the UE capability and a higher layer parameter corresponding to the function is set, the UE can also perform the corresponding function. The higher layer parameter (RRC information element) corresponding to the function can also be specified. In a case where the higher layer parameter is set, the UE can also perform the corresponding function.

[0221] The UE capability can also indicate whether or not the UE supports the function.

[0222] The UE capability can also indicate the maximum number of TCI states supported by the UE that are set by RRC. The maximum number of TCI states set by RRC can also be the maximum number of TCI states set for all of UL and DL. The maximum number of TCI states set by RRC can also be reported independently for the maximum number of TCI states set for UL and the maximum number of TCI states set for DL.

[0223] The UE capability can also indicate the maximum number of activated TCI states supported by the UE. The maximum number of activated TCI states can also be the maximum number of activated TCI states for all of UL and DL. The maximum number of activated TCI states can also be reported independently for the maximum number of activated TCI states for UL and the maximum number of activated TCI states for DL.

[0224] The UE capability can also indicate whether or not the UE supports different activated TCI state pools for UL and DL.

[0225] According to the above seventh embodiment, the UE can maintain compatibility with the existing specifications and implement the at least one function described above.

[0226] (Wireless communication system)

[0227] Hereinafter, a configuration of a wireless communication system to which an embodiment of the present disclosure is applied will be described. In the wireless communication system, any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof is used for communication.

[0228] Figure 14 is a diagram illustrating an example of a schematic configuration of a wireless communication system to which an embodiment is applied. The wireless communication system 1 can also be a system that realizes communication by Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0229] Further, the wireless communication system 1 can also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). The MR-DC can include E-UTRA-NR Dual Connectivity (EN-DC) of LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR, NR-E-UTRA Dual Connectivity (NE-DC) of NR and LTE, and the like.

[0230] In the EN-DC, a base station (eNB) of LTE (E-UTRA) is a Master Node (MN), and a base station (gNB) of NR is a Secondary Node (SN). In the NE-DC, a base station (gNB) of NR is an MN, and a base station (eNB) of LTE (E-UTRA) is an SN.

[0231] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, NR-NR Dual Connectivity (NN-DC) in which both the MN and the SN are base stations (gNBs) of NR).

[0232] The wireless communication system 1 can also have the base station 11 that forms a macro cell C1 with a wider coverage, and the base stations 12 (12a-12c) that are configured within the macro cell C1 and form small cells C2 that are narrower than the macro cell C1. The user terminal 20 can also be located within at least one cell. The configuration, number, and the like of the cells and the user terminal 20 are not limited to the illustrated manner. Hereinafter, the base stations 11 and 12 are collectively referred to as base stations 10 without distinction.

[0233] The user terminal 20 can also be connected to at least one of the plurality of base stations 10. The user terminal 20 can also use at least one of carrier aggregation (CA) using a plurality of component carriers (CCs) and dual connectivity (DC).

[0234] Each CC can 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 can be included in the FR1, and the small cell C2 can be included in the FR2. For example, the FR1 can be a frequency band of 6 GHz or less (sub-6 GHz), and the FR2 can be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands, definitions, and the like of the FR1 and the FR2 are not limited to these, and for example, the FR1 can correspond to a frequency band higher than the FR2.

[0235] Furthermore, the user terminal 20 can use at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC to perform communication.

[0236] The plurality of base stations 10 can be connected by wire (for example, optical fiber based on Common Public Radio Interface (CPRI), X2 interface, or the like) or wirelessly (for example, NR communication). For example, when NR communication is utilized as a backhaul between the base stations 11 and 12, the base station 11 that corresponds to an upper station can be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 that corresponds to a relay station (relay) can be referred to as an IAB node.

[0237] The base station 10 can also be connected to the core network 30 via other base stations 10 or directly. The core network 30 can include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), or the like.

[0238] The user terminal 20 can also be a terminal that supports at least one of LTE, LTE-A, 5G, or the like.

[0239] In the wireless communication system 1, a wireless access scheme 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), or the like can also be used.

[0240] The wireless access scheme can also be referred to as a waveform. In addition, in the wireless communication system 1, other wireless access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) can also be used in the wireless access schemes of the UL and the DL.

[0241] As a downlink channel, in the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared among the user terminals 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), or the like can also be used.

[0242] Furthermore, as an uplink channel, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), and the like, which are shared among the user terminals 20, can also be used in the wireless communication system 1.

[0243] User data, higher layer control information, a system information block (System Information Block (SIB)), and the like are transmitted through the PDSCH. User data, higher layer control information, and the like can also be transmitted through the PUSCH. Furthermore, a master information block (Master Information Block (MIB)) can also be transmitted through the PBCH.

[0244] Lower layer control information can also be transmitted through the PDCCH. The lower layer control information can also contain, for example, downlink control information (Downlink Control Information (DCI)) containing scheduling information of at least one of the PDSCH and the PUSCH.

[0245] In addition, the DCI that schedules the PDSCH can also be referred to as a DL assignment, a DL DCI, or the like, and the DCI that schedules the PUSCH can also be referred to as an UL grant, an UL DCI, or the like. In addition, the PDSCH can also be replaced with DL data, and the PUSCH can also be replaced with UL data.

[0246] In the detection of the PDCCH, a control resource set (COntrol REsource SET (CORESET)) and a search space can also be utilized. The CORESET corresponds to a resource in which the DCI is searched for. The search space corresponds to a search area and a search method of PDCCH candidates. One CORESET can also be associated with one or a plurality of search spaces. The UE can monitor the CORESET associated with a certain search space based on a search space configuration.

[0247] One search space can also correspond to PDCCH candidates equivalent to one or a plurality of aggregation levels. One or a plurality of search spaces can also be referred to as a search space set. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", and the like of the present disclosure can also be replaced with each other.

[0248] Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), delivery confirmation information (for example, also referred to as Hybrid Automatic Repeat reQuest Acknowledgement (HARQ-ACK), ACK / NACK, and the like), and a scheduling request (Scheduling Request (SR)) can also be transmitted through the PUCCH. A random access preamble for establishing a connection with a cell can also be transmitted through the PRACH.

[0249] In addition, in the present disclosure, "downlink", "uplink", and the like can also be described without "link". Furthermore, it can also be described without "Physical" at the beginning of various channels.

[0250] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like can also be transmitted. 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)), and the like can also be transmitted in the wireless communication system 1.

[0251] The synchronization signal can be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) can also be referred to as an SS / PBCH block, an SS block (SSB), or the like. In addition, the SS, SSB, or the like can also be referred to as a reference signal.

[0252] Furthermore, in the wireless communication system 1, as an uplink reference signal (UL-RS), a measurement reference signal (sounding reference signal (SRS)), a demodulation reference signal (DMRS), or the like can also be transmitted. In addition, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific Reference Signal).

[0253] (Base station)

[0254] Figure 15 is a diagram illustrating an example of a 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, the control unit 110, the transmission / reception unit 120, and the transmission / reception antenna 130, and the transmission path interface 140 can each be provided more than one.

[0255] In addition, in this example, mainly the functional blocks of the characteristic part in the present embodiment are illustrated, and it can also be assumed that the base station 10 has other functional blocks required for wireless communication. A part of the processing of each unit described below can also be omitted.

[0256] The control unit 110 implements control of the entire base station 10. The control unit 110 can be constituted by a controller, a control circuit, or the like based on common knowledge in the technical field to which the present disclosure pertains.

[0257] The control unit 110 can also control generation, scheduling (e.g., resource allocation, mapping), and the like of signals. The control unit 110 can also control transmission and reception, measurement, and the like 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, a sequence, and the like transmitted as signals, and forward to the transmission and reception unit 120. The control unit 110 can also perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of wireless resources, and the like.

[0258] The transmission and reception unit 120 can also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 can also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission and reception unit 120 can be configured by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission and reception circuit, and the like, which can be described based on common knowledge in the technical field to which the present disclosure pertains.

[0259] The transmission and reception unit 120 can be configured as an integrated transmission and reception unit, or can be configured by a transmission unit and a reception unit. The transmission unit can be configured by the transmission processing unit 1211 and the RF unit 122. The reception unit can be configured by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

[0260] The transmission and reception antenna 130 can be configured by an antenna, for example, an array antenna, and the like, which can be described based on common knowledge in the technical field to which the present disclosure pertains.

[0261] The transmission and reception unit 120 can transmit the downlink channel, the synchronization signal, the downlink reference signal, and the like described above. The transmission and reception unit 120 can receive the uplink channel, the uplink reference signal, and the like described above.

[0262] The transmission and reception unit 120 can use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like to form at least one of a transmission beam and a reception beam.

[0263] The transmission / reception unit 120 (transmission processing unit 1211) can also perform, for example, processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (for example, RLC retransmission control), processing of a Medium Access Control (MAC) layer (for example, HARQ retransmission control), and the like, with respect to data, control information, and the like acquired from the control unit 110, and generate a bit string to be transmitted.

[0264] The transmission / reception unit 120 (transmission processing unit 1211) can also perform transmission processing of channel coding (may include error correction coding), modulation, mapping, filter processing (filtering processing), Discrete Fourier Transform (DFT) processing (as necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, digital-analog conversion, and the like, with respect to the bit string to be transmitted, and output a baseband signal.

[0265] The transmission / reception unit 120 (RF unit 122) can also perform, with respect to the baseband signal, modulation to a radio frequency band, filter processing, amplification, and the like, and transmit a signal of the radio frequency band via the transmission / reception antenna 130.

[0266] On the other hand, the transmission / reception unit 120 (RF unit 122) can also perform, with respect to a signal of the radio frequency band received by the transmission / reception antenna 130, amplification, filter processing, demodulation to a baseband signal, and the like.

[0267] The transmission / reception unit 120 (reception processing unit 1212) can also apply, with respect to the acquired baseband signal, reception processing of analog-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as necessary), filter processing, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, and the like, and acquire user data and the like.

[0268] The transmission / reception unit 120 (measurement unit 123) can also perform measurements related to a received signal. For example, the measurement unit 123 can also perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, and the like, based on a received signal. The measurement unit 123 can also perform measurements with respect to received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), and the like. Measurement results can also be output to the control unit 110.

[0269] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, and the like, and can also acquire, transmit, and the like, user data (user plane data), control plane data, and the like, for the user terminal 20.

[0270] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure can also be constituted by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0271] The transmission / reception unit 120 can also transmit Downlink Control Information (DCI) indicating a Transmission Configuration Indication (TCI) state that can be applied in downlink and uplink. The control unit 110 can also apply the TCI state at a timing based on the DCI.

[0272] (User terminal)

[0273] Figure 16 is a diagram illustrating an example of a 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 can be included.

[0274] Also, in the present example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, and it is also conceivable that the user terminal 20 has other functional blocks necessary for wireless communication. A part of the processing of each unit described below can also be omitted.

[0275] The control unit 210 implements control of the entire user terminal 20. The control unit 210 can be constituted by a controller, a control circuit, or the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0276] The control unit 210 can also control generation, mapping, and the like of signals. The control unit 210 can also control transmission and reception, measurement, and the like using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 can also generate data, control information, sequences, and the like transmitted as signals, and forward them to the transmission and reception unit 220.

[0277] The transmission and reception unit 220 can also include a baseband unit 221, an RF unit 222, a measurement unit 223. The baseband unit 221 can also include a transmission processing unit 2211, a reception processing unit 2212. The transmission and reception unit 220 can be constituted by a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission and reception circuit, and the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0278] The transmission and reception unit 220 can be constituted as an integrated transmission and reception unit, or can be constituted by a transmission unit and a reception unit. The transmission unit can be constituted by the transmission processing unit 2211, the RF unit 222. The reception unit can be constituted by the reception processing unit 2212, the RF unit 222, the measurement unit 223.

[0279] The transmission and reception antenna 230 can be constituted by an antenna, for example, an array antenna, and the like described based on common knowledge in the technical field to which the present disclosure pertains.

[0280] The transmission and reception unit 220 can receive the downlink channel, the synchronization signal, the downlink reference signal, and the like described above. The transmission and reception unit 220 can transmit the uplink channel, the uplink reference signal, and the like described above.

[0281] The transmission and reception unit 220 can use digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like to form at least one of a transmission beam and a reception beam.

[0282] The transmission / reception unit 220 (transmission processing unit 2211) can also perform, for example, PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), and the like, on data, control information, and the like acquired from the control unit 210, to generate a bit string to be transmitted.

[0283] The transmission / reception unit 220 (transmission processing unit 2211) can also perform channel coding (which can include error correction coding), modulation, mapping, filter processing, DFT processing (as necessary), IFFT processing, precoding, digital-analog conversion, and the like, on the bit string to be transmitted, to output a baseband signal.

[0284] In addition, whether or not to apply DFT processing can also be based on the setting of transform precoding. For a certain channel (for example, PUSCH), in a case where transform precoding is effective (enabled), the transmission / reception unit 220 (transmission processing unit 2211) can also perform DFT processing as the above-described transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, and in a case where this is not so, the transmission / reception unit 220 (transmission processing unit 2211) can also not perform DFT processing as the above-described transmission processing.

[0285] The transmission / reception unit 220 (RF unit 222) can also perform modulation to a radio band, filter processing, amplification, and the like, on the baseband signal, to transmit a signal of the radio band via the transmission / reception antenna 230.

[0286] On the other hand, the transmission / reception unit 220 (RF unit 222) can also perform amplification, filter processing, demodulation to a baseband signal, and the like, on a signal of the radio band received by the transmission / reception antenna 230.

[0287] The transmission / reception unit 220 (reception processing unit 2212) can also apply analog-digital conversion, FFT processing, IDFT processing (as necessary), filter processing, demapping, demodulation, decoding (which can include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, and the like, on the acquired baseband signal, to acquire user data and the like.

[0288] The transmission / reception unit 220 (measurement unit 223) can also perform a measurement related to a received signal. For example, the measurement unit 223 can also perform an RRM measurement, a CSI measurement, and the like, based on a received signal. The measurement unit 223 can also measure a reception power (for example, RSRP), a reception quality (for example, RSRQ, SINR, SNR), a signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result can also be output to the control unit 210.

[0289] In addition, the transmission unit and the reception unit of the user terminal 20 in the present disclosure can also be constituted by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0290] The transmission / reception unit 220 can also receive downlink control information (DCI) indicating a transmission configuration indication (TCI) state applicable in downlink and uplink. The control unit 210 can also apply the TCI state at a timing based on the DCI.

[0291] The control unit 210 can also apply a default TCI state in reception from reception of the DCI to the timing.

[0292] The control unit 210 can also apply the TCI state to a specific control resource set at the timing.

[0293] The control unit 210 can also apply the TCI state to a first channel at a first timing. The control unit 210 can also apply the TCI state to a second channel at a second timing after the first timing.

[0294] (Hardware structure)

[0295] In addition, the block diagrams used in the description of the above-described embodiments show blocks of functional units. These functional blocks (structural units) are realized by any combination of hardware and software, at least one of them. Further, the method of realizing each functional block is not particularly limited. That is, each functional block can be realized by one device physically or logically combined, or by a plurality of devices physically or logically separated and connected directly or indirectly (for example, by wire, wireless, or the like). The functional block can also be realized by combining the above-described one device or the above-described plurality of devices with software.

[0296] Here, in the functions, there are judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, and the like, but are not limited to these. For example, a functional block (structural unit) that realizes a transmission function can also be referred to as a transmitting unit, a transmitter, or the like. Any one of these is as described above, and the implementation method is not particularly limited.

[0297] For example, the base station, the user terminal, and the like in one embodiment of the present disclosure can also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 17 is a diagram illustrating an example of a hardware structure of a base station and a user terminal according to one embodiment. The base station 10 and the user terminal 20 described above 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, and the like.

[0298] In addition, in the present disclosure, the terms of device, circuit, apparatus, section, unit, and the like 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 each device illustrated in the diagram, or can be configured not to include a part of the devices.

[0299] For example, the processor 1001 is illustrated as one, but there can be a plurality of processors. Furthermore, the processing can be performed by one processor, or can be performed by two or more processors simultaneously, sequentially, or with other methods. In addition, the processor 1001 can be realized by one or more chips.

[0300] As for each function in the base station 10 and the user terminal 20, at least one of the operation and the control of the communication via the communication device 1004, or the readout and the writing of the data in the memory 1002 and the storage 1003, is realized by the processor 1001 by reading a specific software (program) into the hardware such as the processor 1001 and the memory 1002.

[0301] The processor 1001, for example, causes an operating system to operate to control the entire computer. The processor 1001 can also be constituted by a central processing device (Central Processing Unit (CPU)) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110 (210), the transmission and reception unit 120 (220), and the like described above can also be realized by the processor 1001.

[0302] Further, the processor 1001 reads out programs (program codes), software modules, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes according to them. As the programs, a program that causes the computer to execute at least a part of the operations described in the above-described embodiments can be used. For example, the control unit 110 (210) can also be realized by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be similarly realized for other functional blocks.

[0303] The memory 1002 can also be a computer-readable recording medium such as at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), other appropriate storage medium. The memory 1002 can also be referred to as a register, a cache, a main memory (main storage device), and the like. The memory 1002 can hold programs (program codes), software modules, and the like that can be executed in order to implement the wireless communication method related to an embodiment of the present disclosure.

[0304] The storage 1003 can also be a computer-readable recording medium such as at least one of a flexible disc, a Floppy (registered trademark) disc, a magneto-optical disc (such as a Compact Disc (Compact Disc ROM (CD-ROM) and the like), a Digital Versatile Disc, a Blu-ray (Blu-ray) (registered trademark) disc), a removable magnetic 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, other appropriate storage medium. The storage 1003 can also be referred to as an auxiliary storage device.

[0305] The communication device 1004 is hardware (transmission-reception device) for performing communication between computers via at least one of a wired network and a wireless network, for example, also referred to as a network device, a network controller, a network card, a communication module, and the like. The communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD). The transmission-reception unit 120 (220), the transmission-reception antenna 130 (230), and the like described above can also be implemented by the communication device 1004. The transmission-reception unit 120 (220) can also be implemented by the transmission unit 120a (220a) and the reception unit 120b (220b) to be physically or logically separated.

[0306] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, and the like) that performs output to the outside. In addition, the input device 1005 and the output device 1006 can also be a structure that is integrated (for example, a touch panel).

[0307] Further, the processor 1001, the memory 1002, and the like are connected by a bus 1007 for communicating information. The bus 1007 can be configured with a single bus, or can be configured with different buses between the devices.

[0308] Further, the base station 10 and the user terminal 20 can also be configured to include a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like hardware, and a part or all of the functional blocks can also be implemented using the hardware. For example, the processor 1001 can also be implemented using at least one of these hardware.

[0309] (Modified example)

[0310] Also, the terms described in the present disclosure and the terms necessary for understanding the present disclosure can be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (or signaling) can be replaced with each other. Also, a signal can be a message. A reference signal (RS) can also be simply referred to as an RS, and can also be referred to as a pilot, a pilot signal, or the like according to the applied standard. Also, a component carrier (CC) can also be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

[0311] A radio frame can also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) composing the radio frame can also be referred to as a subframe. Further, a subframe can also be composed of one or more slots in the time domain. A subframe can also be a fixed length of time (e.g., 1 ms) independent of numerology.

[0312] Here, numerology can also be a communication parameter applied in at least one of transmission and reception of certain signals or channels. For example, numerology can also indicate at least one of a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filter processing performed by a transmitter-receiver in the frequency domain, a specific windowing processing performed by the transmitter-receiver in the time domain, or the like.

[0313] A slot can also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, or the like) in the time domain. Also, a slot can be a time unit based on numerology.

[0314] A slot can also contain a plurality of mini-slots. Each mini-slot can also be composed of one or more symbols in the time domain. Also, 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 slot. A PDSCH (or PUSCH) transmitted in a larger time unit than a mini-slot can also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot can also be referred to as PDSCH (PUSCH) mapping type B.

[0315] A radio frame, a subframe, a slot, a mini-slot, and a symbol each represent a time unit for transmitting a signal. The radio frame, the subframe, the slot, the mini-slot, and the symbol can also be referred to as other names. Also, the time units of the frame, the subframe, the slot, the mini-slot, the symbol, and the like in the disclosure can be replaced with each other.

[0316] For example, one subframe can also be referred to as a TTI, a plurality of continuous subframes can also be referred to as a TTI, one slot or one mini-slot can also be referred to as a TTI. That is, at least one of the subframe and the TTI can be a subframe (1 ms) in the existing LTE, can be a period shorter than 1 ms (for example, 1-13 symbols), or can be a period longer than 1 ms. Also, the unit representing the TTI can not be referred to as a subframe, but can be referred to as a slot, a mini-slot, or the like.

[0317] Here, the TTI, for example, refers to a minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling in which a radio resource (a frequency bandwidth, a transmission power, and the like that can be used in each user terminal) is allocated to each user terminal in a TTI unit. Also, the definition of the TTI is not limited thereto.

[0318] The TTI can also be a transmission time unit of a data packet (a transport block), a code block, a codeword, or the like that has been channel-encoded, and can also become a processing unit of scheduling, link adaptation, or the like. Also, when the TTI is given, a time interval (for example, the number of symbols) to which a transport block, a code block, a codeword, or the like is actually mapped can be shorter than the TTI.

[0319] Also, in the case where one slot or one mini-slot is referred to as a TTI, one or more TTIs (that is, one or more slots or one or more mini-slots) can also become a minimum time unit of scheduling. Further, the number of slots (the number of mini-slots) constituting the minimum time unit of scheduling can also be controlled.

[0320] The TTI having a time length of 1 ms can also be referred to as a normal TTI (a TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a slot, or the like. The TTI shorter than the normal TTI can also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, or the like.

[0321] Also, the long TTI (for example, the normal TTI, the subframe, or the like) can also be replaced with a TTI having a time length longer than 1 ms, and the short TTI (for example, the shortened TTI, or the like) can also be replaced with a TTI having a TTI length shorter than the long TTI and a TTI length of 1 ms or more.

[0322] A resource block (RB) is a unit of resource allocation in the time domain and the frequency domain, and can include one or more contiguous subcarriers in the frequency domain. The number of subcarriers included in an RB can also be the same regardless of numerologies, for example, 12. The number of subcarriers included in an RB can also be determined based on numerologies.

[0323] In addition, an RB can include one or more symbols in the time domain, and can be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. can also be composed of one or more resource blocks, respectively.

[0324] In addition, one or more RBs can also be referred to as a physical RB (PRB), a subcarrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0325] In addition, a resource block can also be composed of one or more resource elements (REs). For example, one RE can also be a wireless resource area of one subcarrier and one symbol.

[0326] A bandwidth part (BWP) (may also be referred to as a partial bandwidth, etc.) can also indicate a subset of contiguous common RBs (common resource blocks) for a certain numerology in a certain carrier. Here, the common RBs can be determined by the index of the RBs with respect to the common reference point of the carrier. A PRB can also be defined in a certain BWP and additionally numbered within the BWP.

[0327] A UL BWP (BWP for UL) and a DL BWP (BWP for DL) can also be included in a BWP. For a UE, one or more BWPs can also be configured within one carrier.

[0328] At least one of the configured BWPs can also be activated, and the UE can not be assumed to transmit and receive a specific signal / channel outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure can also be replaced with "BWP".

[0329] In addition, the structures of the radio frame, the subframe, the slot, the mini-slot, the symbol, and the like described above are merely examples. For example, the number of subframes included in a radio frame, the number of slots of each subframe or radio frame, the number of mini-slots included in a slot, the number of symbols included in a slot or a mini-slot, the number of RBs, the number of subcarriers included in an RB, and the number of symbols, the symbol length, the Cyclic Prefix (CP) length, and the like within a TTI can be variously changed.

[0330] Further, the information, parameters, and the like explained in the present disclosure can be expressed by absolute values, can be expressed by relative values with respect to specific values, and can be expressed by corresponding other information. For example, a radio resource can also be indicated by a specific index.

[0331] In the present disclosure, the names used for the parameters and the like are not names in all aspects. Further, the mathematical expressions and the like using these parameters can also be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, and the like) and information elements can be identified by any appropriate names, and thus the various names assigned to these various channels and information elements are not names in all aspects.

[0332] The information, signals, and the like explained in the present disclosure can also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0333] Further, the information, signals, and the like can be output in at least one of the following directions: from higher layers (upper layers) to lower layers (lower layers), and from lower layers to higher layers. The information, signals, and the like can also be input and output via a plurality of network nodes.

[0334] The information, signals, and the like input and output can be stored in a specific location (for example, a memory) and can be managed using a management table. The information, signals, and the like input and output can be overwritten, updated, or appended. The information, signals, and the like output can also be deleted. The information, signals, and the like input can also be transmitted to other devices.

[0335] The notification of information is not limited to the manners / embodiments explained in the present disclosure, but can also be performed in other methods. For example, the notification of information in the present disclosure can also be performed through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0336] In addition, the physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling can also be referred to as an RRC message, for example, can also be an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. Furthermore, the MAC signaling can also be notified, for example, using a MAC Control Element (CE).

[0337] In addition, the notification of specific information (e.g., the notification of "X is") is not limited to explicit notification, but can also be performed implicitly (e.g., by not performing the notification of the specific information, or by the notification of other information).

[0338] The determination can be performed through a value represented by one bit (0 or 1), can also be performed through a true / false value (Boolean value) represented by true or false, and can also be performed through a comparison of numerical values (e.g., a comparison with a specific value).

[0339] Software, regardless of the term by which it is known, should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0340] Also, software, instructions, information, etc. can be transmitted as encoded signals using a transmission medium having a wired, and / or a wireless, communication mechanism. As an example, when the software is transmitted from a website, server, or other remote source using at least one of wired (coaxial cables, fiber optic cables, twisted pair cables, digital subscriber line (DSL), or the like) and / or wireless (infrared, radio, microwave, or the like) technologies, the at least one of wired or wireless technologies is included within the definition of transmission medium.

[0341] The terms “system” and “network” used in the present disclosure can be used interchangeably. The “network” can also mean an apparatus (e.g., a base station) included in the network.

[0342] In the present disclosure, the terms “precoding”, “precoder”, “weight (precoding weight)”, “Quasi-Co-Location (QCL)”, “Transmission Configuration Indication state (TCI state)”, “spatial relation”, “spatial domain filter”, “transmission power”, “phase rotation”, “antenna port”, “antenna port group”, “layer”, “number of layers”, “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, “panel”, etc. can be used interchangeably.

[0343] In the present disclosure, the terms "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", and the like can be used interchangeably. There are also cases where the base station is called with the terms macro cell, small cell, femto cell, pico cell, and the like.

[0344] A base station can accommodate one or more (for example, three) cells. In the case of a base station accommodating multiple cells, the coverage area of the base station as a whole can be divided into multiple smaller areas, each of which can also be provided with communication services by a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers 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 the coverage.

[0345] In the present disclosure, the terms "mobile station (MS)", "user terminal", "user equipment (UE)", "terminal", and the like can be used interchangeably.

[0346] There are also cases where the mobile station is called with the terms 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.

[0347] At least one of the base station and the mobile station can also be referred to as a transmission device, a reception device, a wireless communication device, or the like. In addition, at least one of the base station and the mobile station can also be a device mounted on a mobile body, a mobile body itself, or the like. The mobile body can be a vehicle (for example, a car, an airplane, or the like), a mobile body that moves in a unmanned manner (for example, a drone, an automated driving vehicle, or the like), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station can also be a sensor or the like, an Internet of Things (IoT) device.

[0348] Further, the base station in the present disclosure can also be replaced with a user terminal. For example, for a structure in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, also referred to as Device-to-Device (D2D), Vehicle-to-Everything (V2X), or the like), each of the modes / embodiments of the present disclosure can also be applied. In this case, a structure in which the user terminal 20 has the functions of the base station 10 described above can also be provided. Further, the terms "uplink", "downlink", and the like can also be replaced with terms corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, and the like can also be replaced with a side channel.

[0349] Likewise, the user terminal in the present disclosure can also be replaced with a base station. In this case, a structure in which the base station 10 has the functions of the user terminal 20 described above can also be provided.

[0350] In the present disclosure, operations performed by the base station are sometimes also performed by an upper node thereof depending on the situation. Obviously, in a network including one or a plurality of network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, consider a Mobility Management Entity (MME), a Serving-Gateway (S-GW), or the like, but not limited to these), or a combination thereof.

[0351] The modes / embodiments explained in the present disclosure can be used alone or in combination, and can also be used in switching as the execution proceeds. Further, the processing procedure, sequence, flowchart, and the like of the modes / embodiments explained in the present disclosure can also be changed in order as long as they are not contradictory. For example, for the method explained in the present disclosure, the elements of various steps are prompted using the order of the examples, but are not limited to the specific order prompted.

[0352] The modes / embodiments explained 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, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer, a fraction)), 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. Further, a plurality of systems can also be combined (for example, LTE or LTE-A, in combination with 5G, and the like) and applied.

[0353] The recitation "based on" as used in the present disclosure, unless otherwise specifically indicated, is not intended to mean "based only on." In other words, the recitation "based on" is intended to mean both "based only on" and "based at least on."

[0354] Any reference to an element using a designation of "first," "second," and the like does not limit the quantity or order of those elements. Such designations are used herein as a convenient method of distinguishing between two or more elements and are not intended to imply that the elements so designated must necessarily appear in that order.

[0355] The term "determining" as used in the present disclosure can encompass a wide variety of actions. For example, "determining" can include calculating, computing, processing, deriving, investigating, looking up (such as looking up in a table, a database or another data structure), ascertaining and the like.

[0356] In addition, "determining" can include receiving (such as receiving information), accessing (such as accessing data in a memory), and the like.

[0357] Furthermore, "determining" can include resolving, selecting, choosing, establishing and the like.

[0358] In addition, "determining" can be construed as "assuming," "expecting," "considering" and the like.

[0359] The "maximum transmission power" according to the present disclosure can mean a maximum value of the transmission power, a nominal maximum transmission power (the nominal UE maximum transmit power), or a rated maximum transmission power (the rated UE maximum transmit power).

[0360] The term "connected", "coupled", or all modifications thereof, used in the present disclosure, means all connections or couplings between two or more elements, directly or indirectly, and can include a case where one or more intermediate elements exist between two elements "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" can be replaced with "accessed".

[0361] In the present disclosure, in a case where two elements are connected, one or more wires, cables, printed electrical connections, etc. can be considered to be used, and electromagnetic energy having a wavelength in a radio frequency domain, a microwave region, an optical (both visible and non-visible) region, etc. can be considered to be used as several non-limiting and non-inclusive examples, and can be "connected" or "coupled" to each other.

[0362] In the present disclosure, the term "A is different from B" can also mean "A and B are different from each other". In addition, the term can also mean "A and B are different from C, respectively". The terms "separated", "coupled", etc. can also be interpreted in the same manner as "different".

[0363] In the present disclosure, in a case where "include", "including", and modifications thereof are used, these terms mean the same as the term "comprising" and are inclusive. Further, the term "or" used in the present disclosure does not mean the same as the term "exclusive or".

[0364] In the present disclosure, for example, in a case where an article is added by a translation such as a, an, and the in English, the present disclosure can also include a case where a noun following the article is plural.

[0365] The application related to the present disclosure has been described in detail above, but it is apparent to those skilled in the art that the application related to the present disclosure is not limited to the embodiments described in the present disclosure. The application related to the present disclosure can be implemented as a modification and a change without departing from the gist and the scope of the application determined based on the recitations of the claims. Therefore, the recitations of the present disclosure are intended for the purpose of illustrative explanation, and do not have any limiting meaning on the application related to the present disclosure.

Claims

1. A terminal, characterized by comprising: Having: a reception unit that receives downlink control information (DCI) indicating a transmission configuration indication (TCI) state that can be applied in downlink and uplink; and a control unit that applies the TCI state from a timing after an ACKnowledgement (ACK) corresponding to reception of a downlink shared channel (PDSCH) scheduled by the DCI is transmitted, the control unit controls so that an uplink control channel (PUCCH) containing the ACK corresponding to reception of the PDSCH is transmitted using another TCI state indicated before the TCI state indicated by the DCI, the control unit does not apply the TCI state to CORESET0.

2. The terminal according to claim 1, wherein the reception unit further receives a list containing a plurality of TCI states that can be applied in downlink and uplink, and receives a medium access control control element (MAC CE) that activates one or more TCIs containing the TCI state in the list.

3. The terminal according to claim 2, characterized by Further comprising: a transmission unit that transmits capability information indicating a maximum number of the one or more TCI states activated by the MAC CE.

4. A wireless communication method of a terminal, the method comprising: Having: a step of receiving downlink control information (DCI) indicating a transmission configuration indication (TCI) state that can be applied in downlink and uplink; a step of applying the TCI state from a timing after an ACKnowledgement (ACK) corresponding to reception of a downlink shared channel (PDSCH) scheduled by the DCI is transmitted; and a step of controlling so that an uplink control channel (PUCCH) containing the ACK corresponding to reception of the PDSCH is transmitted using another TCI state indicated before the TCI state indicated by the DCI, in the step of applying the TCI state, the TCI state is not applied to CORESET0.

5. A base station, characterized by Having: a transmission unit that transmits downlink control information (DCI) indicating a transmission configuration indication (TCI) state that can be applied in downlink and uplink; and a control unit that controls so that, by transmitting the DCI, a terminal applies the TCI state from a timing after an ACKnowledgement (ACK) corresponding to reception of a downlink shared channel (PDSCH) scheduled by the DCI is transmitted from the terminal, the control unit controls so that an uplink control channel (PUCCH) transmitted from the terminal using another TCI state indicated before the TCI state indicated by the DCI is received, the PUCCH containing the ACK corresponding to reception of the PDSCH in the terminal, the TCI state is not applied to CORESET0.

6. A system including a terminal and a base station, characterized by the terminal having: a reception unit that receives downlink control information (DCI) indicating a transmission configuration indication (TCI) state that can be applied in downlink and uplink; and a control unit that applies the TCI state from a timing after an ACKnowledgement (ACK) corresponding to reception of a downlink shared channel (PDSCH) scheduled by the DCI is transmitted, the control unit controls so that an uplink control channel (PUCCH) containing the ACK corresponding to reception of the PDSCH is transmitted using another TCI state indicated before the TCI state indicated by the DCI, the control unit does not apply the TCI state to CORESET0. The control unit applies the TCI state from a timing after an ACKnowledgement, ACK, corresponding to reception of a downlink shared channel, PDSCH, scheduled by the DCI, The control unit controls to transmit an uplink control channel, PUCCH, containing the ACK corresponding to reception of the PDSCH using another TCI state indicated before the TCI state indicated by the DCI, The control unit does not apply the TCI state to a CORESET0, The base station has: A transmitting unit that transmits the DCI.

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