Terminal, wireless communication method and base station

Abstract

A terminal according to one embodiment of the present disclosure includes: a receiving unit that receives TCI state information indicating multiple transmission configuration indication (TCI) states and receives group common downlink control information; and a control unit that applies a TCI state associated with a value of a field in the downlink control information among the multiple TCI states to at least one signal of an uplink and a downlink. 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 Art

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

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

[0004] Prior art literature

[0005] Non-patent literature

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

[0007] Problems to be solved by the invention

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

[0009] However, there are cases where the information on QCL is unclear. If the information on QCL is unclear, there is a concern that the communication quality and throughput may be degraded.

[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 determine information related to QCL.

[0011] Means for solving problems

[0012] A terminal involved in one embodiment of the present invention comprises: a receiving unit, which receives TCI state information representing multiple transmission configuration indication (TCI) states and receives group-common downlink control information; and a control unit, which applies a TCI state among the multiple TCI states that is associated with a value of a field in the downlink control information to a signal of at least one of an uplink and a downlink.

[0013] Effects of the Invention

[0014] According to one embodiment of the present disclosure, information related to QCL can be appropriately determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a diagram showing an example of a common beam for both DL and UL.

[0016] Figure 2 This is a diagram showing an example of a common beam for DL ​​and a common beam for UL.

[0017] Figure 3 This is a diagram showing an example of use case 0.

[0018] Figure 4 This is a diagram showing an example of Use Case 1.

[0019] Figure 5 This is a diagram showing an example of Use Case 2.

[0020] Figure 6 This is a diagram showing an example of the TCI status for a UE group.

[0021] Figure 7 This is a diagram showing an example of setting 1 according to the first embodiment.

[0022] Figure 8 This is a diagram showing an example of setting 2 according to the first embodiment.

[0023] Fig. 9A and 9B is a diagram showing an example of updating of the TCI assumption involved in the first embodiment.

[0024] Fig. 10A And 10B is a diagram showing an example of success / failure of reception of group common DCI.

[0025] Fig.11 This is a diagram showing an example of PUCCH resource configuration involved in method 3-1.

[0026] Fig.12 This is a diagram showing an example of PUCCH resource configuration involved in method 3-2.

[0027] Fig.13A And 13B is a diagram showing an example of group-common PUCCH resources.

[0028] Fig.14 This is a diagram showing an example of the operation involved in method 3-3.

[0029] Fig.15 This is a diagram showing an example of the operation involved in method 3-4.

[0030] Fig.16 This is a diagram showing an example of the operation according to the fourth embodiment.

[0031] Fig.17 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0032] Fig.18 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0033] Fig.19 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0034] Fig. 20 This is a diagram showing an example of the hardware configuration of a base station and a user terminal involved in one embodiment. DETAILED DESCRIPTION

[0035] (TCI, spatial relationship, QCL)

[0036] In NR, research is being conducted on: controlling the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and coding) of at least one of a signal and a channel (expressed as signal / channel) in the UE based on the transmission setting indication state (Transmission Configuration Indication state (TCI state)).

[0037] The TCI state may also represent information applied to a downlink signal / channel. Information corresponding to the TCI state applied to an uplink signal / channel may also be expressed as a spatial relation.

[0038] The so-called TCI state refers to information related to Quasi-Co-Location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relationship information, etc. The TCI state may also be set for each channel or each signal in the UE.

[0039] QCL refers to an indicator that indicates the statistical properties of a signal / channel. For example, when a certain signal / channel is in a QCL relationship with other signals / channels, it can also mean that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter) is the same among these different signals / channels (at least one of these is QCL).

[0040] In addition, the spatial reception parameter may also correspond to the reception beam of the UE (eg, reception simulation beam), or may be a beam determined based on the spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may also be replaced by sQCL (spatial QCL).

[0041] Regarding QCL, multiple types (QCL types) are specified. For example, four QCL types AD may be set, and the parameters (or parameter sets) that can be assumed to be the same in the four QCL types AD are different. The following shows the parameters (also referred to as QCL parameters):

[0042] QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0043] QCL Type B (QCL-B): Doppler shift and Doppler spread,

[0044] QCL Type C (QCL-C): Doppler shift and average delay,

[0045] QCL type D (QCL-D): spatial reception parameters.

[0046] The situation in which the UE assumes that a certain control resource set (CORESET), channel or reference signal is in a specific QCL (for example, QCL type D) relationship with other CORESETs, channels or reference signals can also be called QCL assumption.

[0047] The UE may also determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI status or QCL assumption of the signal / channel.

[0048] The TCI state may be, for example, information related to the QCL of the target channel (in other words, the reference signal (RS) used for the channel) and other signals (for example, other RS). The TCI state may also be set (indicated) by high-layer signaling, physical layer signaling, or a combination of these.

[0049] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)).

[0050] The channel whose TCI state or spatial relationship is set (specified) may be, for example: at least one of the downlink shared channel (Physical Downlink Shared Channel (PDSCH)), the downlink control channel (Physical Downlink Control Channel (PDCCH)), the uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and the uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0051] In addition, the RS that is in a QCL relationship with the channel may be, for example: a synchronization signal block (SynchronizationSignal Block (SSB)), a channel state information reference signal (CSI-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a tracking CSI-RS (also called a tracking reference signal, Tracking Reference Signal (TRS)), and at least one of a QCL detection reference signal (also called QRS).

[0052] 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)). SSB may also be referred to as an SS / PBCH block.

[0053] The RS of QCL type X in the TCI state may also mean: an RS that is in a QCL type X relationship with a certain channel / signal (DMRS), and the RS may also be called a QCL source of QCL type X in the TCI state.

[0054] (Path loss RS)

[0055] Regarding the path loss PL in the transmission power control of each of PUSCH, PUCCH, and SRS b，f，c (q d ) [dB], the index q of the reference signal (RS, path loss reference RS) for the downlink BWP associated with the activated ULBWPb of carrier f of the serving cell c is used by the UE d , to calculate. In the present disclosure, the path loss reference RS, path loss (pathloss(PL))-RS, index q d , RS used in path loss calculation, RS resources used in 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.

[0056] It is being studied whether to change the existing mechanism of higher layer filtered RSRP used for path loss measurement when the path loss RS is updated through MAC CE.

[0057] In the case where the path loss RS is updated through MAC CE, path loss measurement based on L1-RSRP can be applied. It is also possible that at an available timing after the MAC CE for the update of the path loss RS, the high-layer filter RSRP is used for path loss measurement, and before the high-layer filter RSRP is applied, the L1-RSRP is used for path loss measurement. It is also possible that at an available timing after the MAC CE for the update of the path loss RS, the high-layer filter RSRP is used for path loss measurement, and before this timing, the high-layer filter RSRP of the previous path loss RS is used. It is also possible that, similar to the operation of Rel.15, the high-layer filter RSRP is used for path loss measurement, and the UE tracks all path loss RS candidates set through RRC. The maximum number of path loss RSs that can be set through RRC may also depend on UE capabilities. It is also possible that, in the case where the maximum number of path loss RSs that can be set through RRC is X, path loss RS candidates below X are set through RRC, and the path loss RS is selected from the set path loss RS candidates through MAC CE. The maximum number of path loss RSs that can be set through RRC can also be 4, 8, 16, 64, etc.

[0058] In the present disclosure, high-layer filter RSRP, filtered RSRP, and layer 3 filter RSRP (layer3filteredRSRP) may also be interchangeable.

[0059] (Default TCI status / Default spatial relationship / Default PL-RS)

[0060] In RRC connection mode, in both cases where the TCI information in the DCI (high-layer parameter TCI-PresentInDCI) is set to "valid (enabled)" and the TCI information in the DCI is not set, when the time offset between the reception of the DL DCI (DCI that schedules the PDSCH) and the corresponding PDSCH (the PDSCH scheduled by the DCI) is less than the threshold (timeDurationForQCL) (application condition, first condition), in the case of non-cross-carrier scheduling, the TCI state of the PDSCH (default TCI state) is the TCI state of the lowest CORESET ID in the latest time slot in the activated DL BWP of the CC (specific UL signal). Otherwise, the TCI state of the PDSCH (default TCI state) may also be the TCI state of the lowest TCI state ID of the PDSCH in the activated DL BWP of the scheduled CC.

[0061] In Rel. 15, a MAC CE for activation / deactivation of the PUCCH spatial relationship and a MAC CE for activation / deactivation of the SRS spatial relationship are required. The PUSCH spatial relationship follows the SRS spatial relationship.

[0062] In Rel. 16, at least one of the MAC CE for activation / deactivation of the PUCCH spatial relationship and the MAC CE for activation / deactivation of the SRS spatial relationship may not be used.

[0063] In FR2, when both the spatial relationship and PL-RS for PUCCH are not set (application condition, second condition), the default assumption of spatial relationship and PL-RS (default spatial relationship and default PL-RS) is applied to PUCCH. In FR2, when both the spatial relationship and PL-RS for SRS (SRS resources for SRS, or SRS resources corresponding to SRI in DCI format 0_1 ​​that schedules PUSCH) are not set (application condition, second condition), the default assumption of spatial relationship and PL-RS (default spatial relationship and default PL-RS) is applied to PUSCH and SRS scheduled by DCI format 0_1.

[0064] In the activated DL BWP on this CC, when CORESET is set (applicable conditions), the default spatial relationship and default PL-RS may also be the TCI state or QCL assumption of the CORESET with the lowest CORESET ID in the activated DL BWP. In the activated DL BWP on this CC, when CORESET is not set, the default spatial relationship and default PL-RS may also be the activated TCI state of the PDSCH with the lowest ID in the activated DL BWP.

[0065] In Rel.15, the spatial relationship of the PUSCH scheduled by DCI format 0_0 follows the spatial relationship of the PUCCH resource with the lowest PUCCH resource ID in the activated spatial relationship of the PUCCH on the same CC. Even if the PUCCH is not sent on the SCell, the network needs to update the PUCCH spatial relationship on all SCells.

[0066] In Rel.16, the PUCCH setting for the PUSCH scheduled by DCI format 0_0 is not required. When there is no activated PUCCH spatial relationship or no PUCCH resources on the activated UL BWP in the CC for the PUSCH scheduled by DCI format 0_0 (application condition, second condition), the default spatial relationship and default PL-RS are applied to the PUSCH.

[0067] The application conditions for the default spatial relationship / default PL-RS for SRS may also include: the default beam path loss activation information element for SRS (high-level parameter enableDefaultBeamPlForSRS) is set to valid. The application conditions for the default spatial relationship / default PL-RS for PUCCH may also include: the default beam path loss activation information element for PUCCH (high-level parameter enableDefaultBeamPlForPUCCH) is set to valid. The application conditions for the default spatial relationship / default PL-RS for PUSCH scheduled via DCI format 0_0 may also include: the default beam path loss activation information element for PUSCH scheduled via DCI format 0_0 (high-level parameter enableDefaultBeamPlForPUSCH0_0) is set to valid.

[0068] The above-mentioned threshold may also be referred to as time duration for QCL, "timeDurationForQCL", "Threshold", "Threshold for offset between a DCI indicating aTCI state and a PDSCH scheduled by theDCI", "Threshold-Sched-Offset", scheduling offset threshold, scheduling offset threshold, etc.

[0069] (Multiple TRP)

[0070] In NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi TRP (MTRP)) are being studied using one or more panels (multi-panels) to perform DL transmissions to the UE. In addition, the UE is studying using one or more panels to perform UL transmissions to one or more TRPs.

[0071] In addition, multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0072] Multiple TRPs (for example, TRP#1, #2) can also be connected through an ideal / non-ideal backhaul to exchange information, data, etc. Different code words (CW) and different layers can also be sent from each TRP of the multiple TRPs. As a method of sending multiple TRPs, non-coherent joint transmission (NCJT) can also be used.

[0073] In NCJT, for example, TRP#1 performs modulation mapping and layer mapping on a first codeword, thereby transmitting a first PDSCH using a first precoding for a first number of layers (e.g., 2 layers). In addition, TRP#2 performs modulation mapping and layer mapping on a second codeword, thereby transmitting a second PDSCH using a second precoding for a second number of layers (e.g., 2 layers).

[0074] In addition, multiple PDSCHs (multi-PDSCHs) subjected to NCJT can also be defined as partially overlapping or completely overlapping with respect to at least one of the time domain and the frequency domain. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP can also overlap in at least one of the time and frequency resources.

[0075] These first PDSCHs and second PDSCHs may also be considered not to be in a quasi-co-location (QCL) relationship (not quasi-co-located). Reception of multiple PDSCHs may also be replaced by simultaneous reception of PDSCHs that are not of a certain QCL type (eg, QCL type D).

[0076] Multiple PDSCHs from multiple TRPs (also referred to as multiple PDSCHs) can also be scheduled using one DCI (single DCI, single PDCCH) (single-primary mode, single-DCI based multi-TRP). Multiple PDSCHs from multiple TRPs can also be scheduled separately using multiple DCIs (multiple DCIs, multiple PDCCHs) (multiple-primary mode, multi-TRPs based on multiple DCIs (multi-DCI based multi-TRP)).

[0077] Based on such a multi-TRP scheme, more flexible transmission control using channels with good quality can be performed.

[0078] In order to support the transmission of multiple TRPs within a cell (intra-cell, with the same cell ID) and between cells (inter-cell, with different cell IDs) based on multiple PDCCHs, in the RRC setting information used to link multiple pairs of PDCCHs and PDSCHs with multiple TRPs, a control resource set (CORESET) in the PDCCH setting information (PDCCH-Config) can also correspond to one TRP.

[0079] (unified / common TCI framework)

[0080] According to the unified TCI framework, UL and DL channels can be controlled through a common framework. Regarding the unified TCI framework, unlike Rel.15, the TCI state or spatial relationship is not specified for each channel. It can be that a common beam is indicated and applied to all UL and DL channels, or that the common beam for UL is applied to all UL channels and the common beam for DL ​​is applied to all DL channels.

[0081] One common beam for both DL and UL, or a common beam for DL ​​and a common beam for UL (overall, 2 common beams) is under study.

[0082] The UE may also assume the same TCI state (joint TCI state, joint TCI state pool) for UL and DL.

[0083] exist Figure 1 In the example, RRC sets multiple TCI states for both DL and UL (joint common TCI state pool). For each of the multiple TCI states, it can also be SSB, CSI-RS, or SRS. MAC CE can also activate part of the multiple TCI states that are set. DCI can also indicate at least one of the multiple TCI states that are activated.

[0084] Alternatively, the default beams of UL and DL may be unified through MAC CE-based beam management. The default TCI state of PDSCH may also be updated to match (unify, conform to) the default UL beam (spatial relationship).

[0085] Alternatively, a common beam / unified TCI state may be indicated from the same TCI state pool (joint common TCI state pool) for both UL and DL through DCI-based beam management. M (>1) TCI states may also be activated through MAC CE. UL / DL DCI may also select one of the M activated TCI states. The selected TCI state may also be applied to channels / RS for both UL and DL.

[0086] The UE may also envision different TCI states for each of UL and DL (separate TCI states, separate TCI state pools, UL separate TCI state pools and DL separate TCI state pools, UL common TCI state pools and DL common TCI state pools).

[0087] exist Figure 2 In the example, RRC (parameters, information elements) can also set multiple TCI states (pools) for each UL and DL channel.

[0088] The MAC CE may select (activate) one or more (eg, multiple) TCI states (sets) for each of the UL and DL channels. The MAC CE may also activate two sets of TCI states.

[0089] The DL DCI may also select (indicate) more than one (e.g., 1) TCI state. The TCI state may also be applied to more than one DL channel. The DL channel may also be PDCCH / PDSCH / CSI-RS. The UE may also use the TCI state operation (TCI framework) of Rel.16 to determine the TCI state of each DL channel / RS.

[0090] The UL DCI may also select (indicate) more than one (eg, 1) TCI state. The TCI state may also be applied to more than one UL channel. The UL channel may also be PUSCH / SRS / PUCCH.

[0091] As use cases for a separate public TCI state pool, the following use cases 0, 1, and 2 are being studied.

[0092] [Use Case 0]

[0093] The UE uses different UL beams due to the Maximum Permitted Exposure (MPE).

[0094] exist Figure 3 In the example, the UL of panel #1 accepts MPE issues and the UE uses panel #2 in the UL.

[0095] [Use Case 1]

[0096] The UE uses different UL beams due to the UL signal strength.

[0097] Figure 4 In the example, the distance between the UE and TRP (cell, base station) #1 is longer than the distance between the UE and TRP #2. Here, the L1-RSRP of panel #1 is higher than the L1-RSRP of panel #2, and the UL transmit power of panel #2 is higher than the UL transmit power of panel #1. The UE uses panel #1 in the DL from TRP #1 and uses panel #2 in the UL to TRP #2.

[0098] [Use Case 2]

[0099] The UE uses different UL beams due to UL load balancing.

[0100] Figure 5 In the example, the L1-RSRP of panel #1 is higher than the L1-RSRP of panel #2, and the UL load of panel #2 is lower than the UL load of panel #1. The UE uses panel #1 in DL from TRP #1 and uses panel #2 in UL to TRP #2.

[0101] Consider studying more scenarios with different requirements. For example, in multi-TRP transmission, high speed train (HST) transmission, inter-cell mobility during the period when the UE can connect to two cells, etc., the common beam for each TRP and cell can be different.

[0102] In this case, the UE may also have multiple panels for FR2. In this case, the common beams for each UE panel may be different.

[0103] like Figure 6 As in the example of , multiple UEs are assumed in a mobile body such as a bus / train / car, and the PDCCH overhead is increased due to dedicated signaling for the TCI state.

[0104] Consider that in the unified / common TCI state, in order to avoid differences between the UE and the base station in the update of the PDCCH beam, the UE applies the beam indication after sending the HARQ-ACK corresponding to the DCI indication. This means that the base station needs to perform the next 2 PDCCH transmissions.

[0105] [PDCCH transmission 1]

[0106] Update of common beams.

[0107] [PDCCH transmission 2]

[0108] Scheduling of PDSCH.

[0109] When the overhead of the PDCCH increases, there is a concern that throughput degradation and the like may be caused.

[0110] Therefore, the inventors of the present invention have conceived a method for indicating the TCI status.

[0111] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be used alone or in combination.

[0112] In the present disclosure, "A / B / C", "at least one of A, B and C" may also be replaced with each other. In the present disclosure, cell, CC, carrier, BWP, DL BWP, UL BWP, activated DL BWP, activated UL BWP, and band may also be replaced with each other. In the present disclosure, index, ID, indicator, and resource ID may also be replaced with each other. In the present disclosure, support, control, controllable, operating, and capable of operating may also be replaced with each other.

[0113] In the present disclosure, configure, activate, update, indicate, enable, specify, and select may be used interchangeably.

[0114] In the present disclosure, MAC CE and activation / deactivation command may also be replaced with each other.

[0115] In the present disclosure, high-layer signaling may also be, for example, one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, high layers, high-layer parameters, RRC information elements (IEs), and RRC messages may also be interchangeable.

[0116] MAC signaling may also use, for example, MAC Control Element (MAC CE), MAC Protocol Data Unit (PDU), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0117] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameter, spatial domain reception filter, UE spatial domain reception filter, UE reception beam, DL beam, DL reception beam, DL precoding, DL precoder, DL-RS, RS of QCL type D assumed by TCI state / QCL, RS of QCL type A assumed by TCI state / QCL, spatial relationship, spatial domain transmission filter, UE spatial domain transmission filter, UE transmission beam, UL beam, UL transmission beam, UL precoding, UL precoder, PL-RS can also 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, DL-RS source, SSB, CSI-RS, SRS can also be replaced with each other.

[0118] UL DCI, DCI for scheduling UL channel (PUSCH), and DCI format 0_x (x=0, 1, 2, ...) can also be replaced with each other. DL DCI, DCI for scheduling DL channel (PDSCH), and DCI format 1_x (x=0, 1, 2, ...) can also be replaced with each other.

[0119] In the present disclosure, HARQ-ACK information, ACK, and NACK may also be used interchangeably.

[0120] In the present disclosure, single TRP, single TRP system, single TRP transmission, and single PDSCH may also be mutually replaced. In the present disclosure, multiple TRPs, multiple TRP systems, multiple TRP transmissions, and multiple PDSCH may also be mutually replaced. In the present disclosure, single DCI, single PDCCH, multiple TRPs based on single DCI, and activation of two TCI states on at least one TCI code point may also be mutually replaced.

[0121] In the present disclosure, a single TRP, a channel using a single TRP, a channel using one TCI state / spatial relationship, multiple TRPs not activated through RRC / DCI, multiple TCI states / spatial relationships not activated through RRC / DCI, a CORESET pool index (CORESETPoolIndex) value is not set for any CORESET, and any code point of the TCI field is not mapped to 2 TCI states and can also be replaced with each other.

[0122] In the present disclosure, multiple TRPs, channels using multiple TRPs, channels using multiple TCI states / spatial relationships, multiple TRPs activated by RRC / DCI, multiple TCI states / spatial relationships activated by RRC / DCI, multiple TRPs based on a single DCI, and at least one of multiple TRPs based on multiple DCI may also be replaced with each other. In the present disclosure, multiple TRPs based on multiple DCIs and setting a CORESET pool index (CORESETPoolIndex) value for a control resource set (CORESET) may also be replaced with each other. In the present disclosure, multiple TRPs based on a single DCI and at least one code point of a TCI field mapped to two TCI states may also be replaced with each other.

[0123] In the present disclosure, TRP1 may correspond to CORESET pool index = 0, or may correspond to the first TCI state of the two TCI states corresponding to one code point of the TCI field. TRP1 may correspond to CORESET pool index = 1, or may correspond to the second TCI state of the two TCI states corresponding to one code point of the TCI field.

[0124] In the present disclosure, link directions, downlink (DL), uplink (UL), one of UL and DL may be replaced with each other.

[0125] In the present disclosure, pool, set, group, and list may be used interchangeably.

[0126] In the present disclosure, a common beam, a unified TCI state, a beam applicable to DL and UL, a beam applied to multiple channels, and PL-RS may be interchangeable.

[0127] (Wireless Communication Method)

[0128] The UE can be set with multiple TCI states (pools) that can be applied to multiple channels / RSs through RRC information elements (TCI state information). The UE can be set with a TCI state pool for both UL and DL (joint TCI state pool), or a TCI state pool for UL and a TCI state pool for DL ​​(separate TCI state pool). Multiple TCI states in the TCI state pool can be activated through MAC CE (TCI state information). DCI can apply one TCI state indicated by DCI among the multiple TCI states that are set / activated to more than one channel / RS (signal) of UL / DL.

[0129] <First embodiment>

[0130] A group common PDCCH may indicate a TCI state in a common TCI state for more than one UE.

[0131] When the corresponding higher layer signaling is set, a new DCI field for TCI status can be introduced in the existing group common DCI (DCI formats 2_0, 2_1, 2_2, 2_3).

[0132] A new DCI format for indicating the TCI state in a common TCI state for more than one UE may also be introduced. The new DCI format (e.g., DCI format 2_x) may also have a field for the TCI state. The UE may also monitor the new DCI format when the corresponding high-layer signaling is set.

[0133] The high-level setting of the unified TCI state can also be based on at least one of the following settings 1 and 2.

[0134] [Set 1]

[0135] UE-specific. The same value of the TCI field for multiple UEs can indicate different TCI states. Alternatively, multiple UE-specific TCI states (lists) may be set for each of the multiple UEs. The multiple TCI states may also be mapped to multiple values ​​of the TCI field, respectively. Each UE may also apply the TCI state corresponding to the value of the TCI field among the multiple TCI states that are set to the transmission / reception of a specific channel / RS.

[0136] Figure 7In the example of , TCI states #1-1 to #1-8 corresponding to TCI field values ​​000 to 111, respectively, may be set to UE #1. TCI states #2-1 to #2-8 corresponding to TCI field values ​​000 to 111, respectively, may be set to UE #2. TCI states #3-1 to #3-8 corresponding to TCI field values ​​000 to 111, respectively, may be set to UE #3.

[0137] [Set 2]

[0138] UE common. The same value of the TCI field for multiple UEs can indicate the same TCI state. Alternatively, multiple common TCI states (lists) are set for each of the multiple UEs. The multiple TCI states can be mapped to multiple values ​​of the TCI field, respectively. Each UE can use the TCI state corresponding to the value of the TCI field among the multiple TCI states that are set for the transmission / reception of a specific channel / RS.

[0139] Figure 8 In the example of , TCI states #1-1 to #1-8 corresponding to values ​​000 to 111 of the TCI field, respectively, may be set to UEs #1 to #3.

[0140] In the case where the UE detects a group common DCI indicating a TCI state, the UE may also update the TCI assumption after a certain time from the detection of the group common DCI ( Fig. 9A ). The detection of the group-common DCI and the last codeword of the group-common DCI may also be replaced with each other.

[0141] In the case where the UE detects a group common DCI indicating a TCI state, the UE may also update the TCI assumption after a specific time from sending the HARQ-ACK information ( Fig. 9B ). Here, the UE may also update the TCI assumption when the HARQ-ACK information is ACK.

[0142] The specific time may be, for example, K symbols. K may be specified in the specification, set by a higher layer, or reported by the UE as a UE capability.

[0143] According to the above first embodiment, the overhead of indicating the TCI status of one or more UEs can be suppressed.

[0144] <Second embodiment>

[0145] It is possible that some UEs fail to receive the group-common DCI. In this case, a deviation (difference, misalignment) in TCI assumptions may occur between multiple UEs or between UEs and base stations.

[0146] Fig. 10A In the example of , a group common DCI for updating a unified TCI state for both UL and DL of UE#1 to #6 is sent to UE#1 to #6. When UE#1 to #6 normally receives the group common DCI, the beam is updated to the indicated unified TCI state after being indicated based on the group common DCI.

[0147] Fig. 10B In the example, UE#3-#6 among UE#1 to #6 that normally receive the group-common DCI updates the beam to the indicated unified TCI state after being indicated based on the group-common DCI. UE#1-#2 among UE#1 to #6 that fail to normally receive the group-common DCI does not update the beam.

[0148] When the TCI state is indicated in the group common PDCCH (DCI), each UE can send HARQ-ACK information (feedback information) on each PUCCH / PUSCH resource according to the group common DCI. The HARQ-ACK information can indicate the success (ACK) or failure (NACK) of the reception / detection / decoding of the group common DCI. The PUCCH / PUSCH resources can also be at least one of the following resources 1 and 2.

[0149] [Resource 1]

[0150] When the group-common DCI has at least one of a PUCCH resource indicator (PRI) field and a HARQ timing indicator field, the PUCCH resource and time slot may be determined by the field.

[0151] [Resource 2]

[0152] In the case where the group-common DCI does not have a PRI field, the PUCCH resources may also be determined by a PUCCH resource set before the RRC connection is established (when dedicated PUCCH resources are not provided) and a PUCCH resource determination method. In the determination method, the UE determines the PUCCH resource set based on parameters provided by the system information (SIB1) and determines the PUCCH resources from the PUCCH resource set based on the PDCCH (PRI field / initial control channel element (CCE) index).

[0153] The HARQ timing indicator field may or may not be included in the group common DCI. When the HARQ timing indicator field is not included in the group common DCI, the HARQ timing may be specified in the specification, may be set by a higher layer, or may be reported by the UE as a UE capability.

[0154] According to the above first embodiment, even when reception of the group-common PDCCH fails, identification (recognition) of the TCI state between the UE and the base station can be made to match (conform).

[0155] <Third Embodiment>

[0156] For the HARQ resources of the group common PDCCH with TCI indication, at least one of the following methods 3-1 to 3-4 may be used.

[0157] 《Method 3-1》UE-specific PUCCH / PUSCH resources

[0158] Method 3-1 may be implemented according to at least one of the following methods 3-1-1 and 3-1-2.

[0159] [Method 3-1-1]

[0160] The PRI / HARQ timing indicator may also have multiple fields for multiple UEs.

[0161] [Method 3-1-2]

[0162] The PRI / HARQ timing indicator may also have 1 field used for multiple UEs.

[0163] For example, the high-level configuration of the PUCCH resources may be UE-specific. The same PRI field may indicate different PUCCH resources for multiple UEs. Alternatively, multiple UE-specific PUCCH resources (lists) may be configured for each of the multiple UEs. The multiple PUCCH resources may also be mapped to multiple values ​​of the PRI field, respectively. Each UE may use the PUCCH resources corresponding to the value of the PRI field among the multiple PUCCH resources configured for the transmission of HARQ-ACK information.

[0164] Fig.11In the example of , PUCCU resources #1-1 to #1-8 corresponding to PRI field values ​​000 to 111, respectively, can be set to UE #1. PUCCU resources #2-1 to #2-8 corresponding to PRI field values ​​000 to 111, respectively, can be set to UE #2. PUCCU resources #3-1 to #3-8 corresponding to PRI field values ​​000 to 111, respectively, can be set to UE #3.

[0165] The mapping between PRI and PUCCH resource lists of multiple UEs may also be set by higher layers.

[0166] The new DCI format may have multiple fields of PRI / HARQ timing indicators. Each field may indicate HARQ resources for one UE in the order of C-RNTI or each field may indicate HARQ resources for multiple UEs in the order of RRC.

[0167] 《Method 3-2》UE common PUCCH / PUSCH resources

[0168] Method 3-2 may also be implemented according to at least one of the following methods 3-2-1 and 3-2-2.

[0169] [Method 3-2-1]

[0170] In the case where a group-common DCI with a TCI indication is detected, the UE may also send HARQ-ACK information in the PUCCH resources. Multiple UEs may share the same PUCCH resources. Multiple common PUCCH resources (lists) may also be set for each of multiple UEs. Multiple PUCCH resources may be mapped to multiple values ​​of the PRI field, respectively. Each UE may also use the PUCCH resources corresponding to the value of the PRI field among the multiple PUCCH resources that are set for sending HARQ-ACK information.

[0171] Fig.12 In the example of , PUCCH resources #1-1 to #1-8 corresponding to values ​​000 to 111 of the PRI field, respectively, may be set to UEs #1 to #3.

[0172] When the group-common DCI with TCI indication is detected and decoded normally, the UE can send PUCCH with ACK. The UE may also not feedback NACK. When the network (NW, such as a base station) distinguishes PUCCH / PUSCH from different UEs, the NW may also regard that there is no beam update for UEs that do not provide feedback (through NACK or detection failure of the group-common DCI). When common PUCCH / PUSCH resources are allocated to multiple UEs, the NW distinguishes PUCCH / PUSCH from different UEs through power domain / time domain / frequency domain / code domain (sequence, cyclic shift).

[0173] When the group-common DCI with TCI indication is detected but not decoded normally, the UE may also send a PUCCH with NACK. In the case where the NW receives the NACK, the NW may also identify that at least one UE did not receive the group-common DCI normally. In the case where the NACK feedback is not received by the NW, the NW cannot identify the situation where the reception of the group-common DCI fails.

[0174] Fig.13A In the example of , PUCCH resources overlapping in the time domain and the frequency domain are allocated to UEs #1 to #4. A UE that fails to decode the group-common DCI normally sends a NACK using PUCCH format 0. Fig. 13B As shown, the base station can detect that at least one UE has sent a NACK by detecting the received power in the PUCCH resources (for example, the received power exceeding the threshold).

[0175] Method 3-3

[0176] In the case where the UE detects the group-common DCI, the UE sends the PUCCH based on method 3-2.

[0177] When PUCCH resources for multiple UEs overlap, it is difficult for the NW to recognize that the detection of the group-common DCI of the UE fails.

[0178] For the NW, whether the UE has detected the group-common DCI is more important information than whether the UE has detected the group-common DCI. How the NW identifies whether the UE has detected the group-common DCI is a problem.

[0179] The possible timing (monitoring timing, PDCCH monitoring timing) / search space of the group-common DCI that indicates the TCI status to multiple UEs can be set / indicated through DCI / higher layers. The UE can monitor the possible timing / search space of the group-common DCI. In the case where the UE detects the group-common DCI normally, the UE may not send PUCCH. In the case where the UE cannot detect the group-common DCI normally, the UE may also send PUCCH based on method 3-2. Only the UE that fails to detect the group-common DCI sends PUCCH, and the base station can identify the failure to receive the DCI of at least one UE.

[0180] Fig.14 In the example, timings #1 and #2 are possible timings / search spaces for group-common DCI indicating the TCI state. When a UE successfully receives the group-common DCI at timing #1 and fails to receive the group-common DCI at timing #2, a PUCCH is sent in the PUCCH resource. The PUCCH resource is not indicated by the group-common DCI. The PUCCH resource can be set by the higher layer or determined from the PUCCH resource set used before the RRC connection is established.

[0181] 《Method 3-4》

[0182] Whether the NW can distinguish the PUCCH feedback from different UEs and how the NW retransmits the group-common DCI for beam updating become issues.

[0183] NW can also follow one of the following methods 3-4-1 and 3-4-2.

[0184] [Method 3-4-1]

[0185] When the NW cannot distinguish PUCCH feedback with NACK from different UEs, the NW can retransmit the same group common DCI to all UEs to which the group common DCI is sent. In this case, in order to indicate to the UE that the PUCCH has been received normally, the fourth embodiment described below can be applied to all UEs.

[0186] [Method 3-4-2]

[0187] In the case that the NW is able to distinguish PUCCH feedback with NACK from different UEs, the NW can identify the UE for which the decoding of the DCI fails. Afterwards, the NW can perform at least one of the following operations 1 to 3.

[0188] [[Operation 1]]

[0189] The same group-common DCI used for TCI indication may also be retransmitted. For example, to support soft combining, the initial transmission and retransmission of the group-common DCI may have the same HARQ process number (HPN) indication. A UE that normally receives the first DCI (initial transmission) may not need to monitor the retransmission of the DCI. The monitoring timing for retransmission may be specified in the specification or may be set by a higher layer. The DCI may also have a field indicating whether it is an initial transmission or a retransmission. Fig.15 In the example, the UE that normally receives the first DCI can also ignore the retransmitted DCI.

[0190] [[Operation 2]]

[0191] The NW may also retransmit the group common DCI with different TCI indications. For example, the retransmission may also be the TCI indication only for the UE that failed to receive the initial transmission. For the UE that successfully received the initial transmission, the TCI status update may not be performed.

[0192] [[Operation 3]]

[0193] The NW may retransmit the UE-specific DCI only to the UE that fails to receive the initial transmission.

[0194] According to the third embodiment described above, even when reception of the group-common PDCCH fails, it is possible to suppress the difference in recognition of the TCI state between the UE and the base station.

[0195] <Fourth embodiment>

[0196] Alternatively, after the UE sends HARQ-ACK information for the group common DCI including the TCI field, the UE receives a response to the HARQ-ACK information, and after a certain time from the reception of the response (e.g., the last symbol of the response), the UE updates the TCI assumption. Fig.16 In the example of , the specific time may be K symbols. K may be specified in the specification, may be set by a higher layer, or may be reported by the UE as a UE capability. The response may be at least one of the following responses 1 and 2.

[0197] [Answer 1]

[0198] The response from the base station may also be a DCI with a CRC scrambled by the x-RNTI. The DCI may be sent in a search space / CORESET configured as a dedicated one or in any search space / CORESET. The x-RNTI may be a C-RNTI or an RNTI (dedicated RNTI, configured as a dedicated RNTI) configured for multiple UEs for group based beam indication.

[0199] [Answer 2]

[0200] The response from the base station may also be sent via dedicated physical resources (set as dedicated physical resources). Dedicated physical resources may be the same as the Physical HARQ Indicator Channel (PHICH) in LTE. Dedicated physical resources may be common to UEs. Alternatively, the same physical resources may be set for multiple UEs. Dedicated physical resources may be UE-specific (UE-specific). Alternatively, different physical resources may be set for each UE.

[0201] According to the fourth embodiment described above, even when reception of the group-common PDCCH fails, it is possible to suppress the difference in recognition of the TCI state between the UE and the base station.

[0202] <Fifth Embodiment>

[0203] The UE capability corresponding to at least one function (feature) in the first to fourth embodiments may also be specified. In the case where the UE reports the UE capability, the UE may also perform the corresponding function. In the case where the UE reports the UE capability and the high-level parameters corresponding to the function are set, the UE may also perform the corresponding function. The high-level parameters (RRC information elements) corresponding to the function may be specified. In the case where the high-level parameters are set, the UE may also perform the corresponding function.

[0204] UE capability may also indicate whether the UE supports the function.

[0205] According to the fifth embodiment described above, the UE can implement at least one of the above functions while maintaining compatibility with existing specifications.

[0206] (Wireless Communication System)

[0207] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0208] Fig.17 1 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0209] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0210] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0211] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0212] The wireless communication system 1 may also include: a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and the user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0213] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0214] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (lower than 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (higher than 24 GHz (above-24 GHz)). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0215] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0216] Multiple base stations 10 may also be connected by wire (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station may also be referred to as an IAB node.

[0217] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0218] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0219] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. may be used.

[0220] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be applied to the UL and DL radio access schemes.

[0221] As downlink channels, the wireless communication system 1 may use a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc.

[0222] In addition, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like can also be used in the wireless communication system 1.

[0223] The PDSCH is used to transmit user data, high-layer control information, system information block (SIB), etc. The PUSCH is also used to transmit user data, high-layer control information, etc. In addition, the PBCH is also used to transmit the master information block (MIB).

[0224] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0225] In addition, the DCI for scheduling PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, PDSCH may also be replaced by DL data, and PUSCH may also be replaced by UL data.

[0226] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0227] A search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be interchangeable.

[0228] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also called hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)) can also be transmitted through PUCCH. Random access preamble code for establishing connection with a cell can also be transmitted through PRACH.

[0229] In the present disclosure, downlink, uplink, etc. may be expressed without "link". In addition, various channels may be expressed without "Physical" at the beginning.

[0230] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may also be transmitted.

[0231] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as an SS / PBCH block, SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0232] In addition, as an uplink reference signal (UL-RS), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted in the wireless communication system 1. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0233] (Base Station)

[0234] Fig.18 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0235] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and the base station 10 may also be assumed to have other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0236] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which the present disclosure relates.

[0237] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0238] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the public knowledge in the technical field involved in the present disclosure.

[0239] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0240] The transmitting / receiving antenna 130 can be constituted by an antenna described based on the common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0241] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0242] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0243] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0244] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, discrete Fourier transform (DFT) processing (as needed), inverse fast Fourier transform (IFFT) processing), precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0245] The transmitting and receiving unit 120 (RF unit 122 ) may perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0246] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may perform amplification, filter processing, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0247] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0248] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (ReceivedSignal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0249] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0250] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0251] The transmitting and receiving unit 120 may transmit TCI state information indicating multiple transmission configuration indication (TCI) states and transmit group common downlink control information. The control unit 110 may apply a TCI state associated with a value of a field in the downlink control information among the multiple TCI states to at least one signal of an uplink and a downlink.

[0252] The transmission and reception unit 120 may also transmit group-common downlink control information indicating a transmission configuration indication (TCI) state. The control unit 110 may also control reception of feedback information indicating success or failure of reception of the downlink control information.

[0253] (User Terminal)

[0254] Fig.19 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided in one or more pieces.

[0255] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and the user terminal 20 may also be assumed to have other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0256] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which the present disclosure relates.

[0257] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0258] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the public knowledge in the technical field involved in the present disclosure.

[0259] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0260] The transmitting / receiving antenna 230 can be constituted by an antenna described based on the common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0261] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0262] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0263] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0264] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0265] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is activated (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0266] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0267] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0268] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0269] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0270] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0271] The transmitting and receiving unit 220 may receive TCI state information indicating multiple transmission configuration indication (TCI) states and receive group common downlink control information. The control unit 210 may apply the TCI state associated with the value of the field in the downlink control information among the multiple TCI states to at least one signal of the uplink and the downlink.

[0272] The control unit 210 may also apply the TCI state to the signal after a specific time has passed since the transmission of feedback information indicating success or failure of reception of the downlink control information.

[0273] The TCI status information may also be terminal-specific.

[0274] The TCI status information may also be common to multiple terminals.

[0275] The transmission and reception unit 220 may also receive group-common downlink control information indicating a transmission configuration indication (TCI) state. The control unit 210 may also control transmission of feedback information indicating success or failure of reception of the downlink control information.

[0276] The transmitting and receiving unit 220 may also receive resource information indicating a plurality of resources of the feedback information. The control unit 210 may also use a resource associated with a value of a field in the downlink control information among the plurality of resources for the transmission.

[0277] The transmitting and receiving unit 220 may also receive monitoring information indicating a monitoring opportunity for the downlink control information. When reception of the downlink control information fails at the monitoring opportunity, the control unit 210 may also control transmission of the feedback information indicating failure in reception of the downlink control information.

[0278] The transmitting and receiving unit 220 may also receive a retransmission of the downlink control information transmitted based on the feedback information, or a response transmitted based on the feedback information.

[0279] (Hardware Structure)

[0280] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0281] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0282] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 20 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0283] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. are interchangeable. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0284] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0285] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0286] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0287] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that enables a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0288] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0289] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0290] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. can also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) can also be installed by the transmitting unit 120a (220a) and the receiving unit 120b (220b) separately physically or logically.

[0291] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0292] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0293] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be installed using at least one of these hardware.

[0294] (Variation Example)

[0295] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0296] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0297] Here, the parameter set may also refer to a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of the subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, wireless frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, etc.

[0298] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0299] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0300] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be interchangeable.

[0301] For example, a subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as a TTI, and a time slot or a mini time slot may also be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may also be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0302] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0303] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may also be shorter than the TTI.

[0304] In addition, when one time slot or one mini time slot is referred to as TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) may also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling may also be controlled.

[0305] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0306] In addition, a long TTI (e.g., normal TTI, subframe, etc.) may be replaced by a TTI having a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) may be replaced by a TTI having a TTI length shorter than that of the long TTI and longer than 1 ms.

[0307] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may also include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0308] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0309] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0310] In addition, a resource block may also be composed of one or more resource elements (RE). For example, one RE may also be a radio resource region of one subcarrier and one symbol.

[0311] A Bandwidth Part (BWP) (also referred to as a partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, a common RB may also be identified by an index of the RB relative to a common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0312] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0313] At least one of the configured BWPs may be activated, and the UE may not assume that it transmits or receives a specific signal / channel other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced by "BWP".

[0314] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0315] In addition, the information, parameters, etc. described in the present disclosure may be expressed by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, a wireless resource may also be indicated by a specific index.

[0316] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. In addition, the mathematical formulas, etc. using these parameters may also be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0317] Information, signals, etc. described in the present disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0318] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0319] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0320] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC)) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0321] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0322] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0323] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0324] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0325] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0326] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0327] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0328] In the present disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro cell, and pico cell.

[0329] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0330] In the present disclosure, terms such as “Mobile Station (MS)”, “user terminal”, “User Equipment (UE)”, and “terminal” can be used interchangeably.

[0331] In some cases, the mobile station is also referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a hand set, a user agent, a mobile client, a client, or some other appropriate terminology.

[0332] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device carried in a mobile body, a mobile body, etc. The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0333] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, expressions such as "uplink" and "downlink" may also be replaced by expressions corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may also be replaced by a side channel.

[0334] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0335] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes, depending on the circumstances, they are performed by its upper node. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0336] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0337] The various modes / implementations described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems expanded based on them. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0338] The term “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the term “based on” means both “based only on” and “based at least on”.

[0339] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to a first and a second element does not mean that only two elements can be used, or that the first element must take precedence over the second element in some form.

[0340] The term "determining" as used in this disclosure may include a variety of actions in some cases. For example, "determining" may also be viewed as "judging", calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, etc.

[0341] In addition, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on receiving (for example, receiving information), transmitting (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc.

[0342] In addition, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on some actions.

[0343] In addition, "judge (decide)" can also be replaced by "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0344] The “maximum transmit power” recorded in the present disclosure may refer to the maximum value of the transmit power, may refer to the nominal maximum transmit power (the nominal UE maximum transmit power), or may refer to the rated maximum transmit power (the rated UE maximum transmit power).

[0345] The terms "connected", "coupled", or all their variations used in this disclosure mean all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination of these. For example, "connection" may also be replaced by "access".

[0346] In the present disclosure, when two elements are connected, it can be considered that they are "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0347] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same manner as "different".

[0348] In the present disclosure, when the terms "include", "including", and their variations are used, these terms, like the term "comprising", have an inclusive meaning. Furthermore, the term "or" used in the present disclosure does not mean an exclusive OR.

[0349] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0350] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the present invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: A receiving unit receives a radio resource control information element RRCIE including TCI state information indicating multiple transmission configuration indication states, i.e., multiple TCI states and specific to each of multiple terminals, and receives downlink control information DCI common to the multiple terminals; and The control unit applies a TCI state associated with the value of the TCI field in the DCI among the multiple TCI states to at least one signal of the uplink and the downlink.

2. A wireless communication method of a terminal, comprising: The step of receiving a radio resource control information element RRCIE including TCI state information indicating multiple transmission configuration indication states, i.e., multiple TCI states and specific to each of multiple terminals, and receiving downlink control information DCI common to the multiple terminals; and The step of applying a TCI state associated with the value of the TCI field in the DCI among the multiple TCI states to at least one signal of an uplink and a downlink.

3. A base station, comprising: a transmitting unit, transmitting a radio resource control information element RRCIE including TCI state information indicating multiple transmission configuration indication states, i.e., multiple TCI states and specific to each of multiple terminals, and transmitting downlink control information DCI common to the multiple terminals; and The control unit applies a TCI state among the multiple TCI states that is associated with the value of the TCI field in the DCI to at least one signal of the uplink and the downlink.

4. A system comprising a terminal and a base station, The terminal has: A receiving unit receives a radio resource control information element RRCIE including TCI state information indicating multiple transmission configuration indication states, i.e., multiple TCI states and specific to each of multiple terminals, and receives downlink control information DCI common to the multiple terminals; and a control unit that applies a TCI state associated with the value of the TCI field in the DCI among the plurality of TCI states to at least one signal of an uplink and a downlink, The base station has: A sending unit sends the RRC IE and the DCI.

Images