Terminal, wireless communication method, base station and system

Abstract

This user equipment is provided with: a control unit that determines, on the basis of an explicit or implicit setting, a first reference signal relating to quasi-colocation (QCL) or a second reference signal for use in measuring path loss for power control of an uplink transmission, as a spatial relationship for the uplink transmission, and determines a parameter relating to the power control of the uplink transmission; and a transmission unit for performing the uplink transmission in accordance with the spatial relationship.

Description

[Technical field]

[0001] The present disclosure relates to a user terminal and a wireless communication method in a next-generation mobile communication system. [Background technology]

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

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

[0004] In existing LTE systems (for example, LTE Rel. 8-14), a user equipment (UE: User Equipment) controls transmission of an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) based on downlink control information (Downlink Control Information (DCI)). [Prior art documents] [Non-patent literature]

[0005] [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 [Problem to be solved by the invention]

[0006] In future wireless communication systems (e.g., NR), it is being considered to specify one of multiple candidates set by higher layer signaling for uplink (UL) transmission beams (spatial relationships) such as PUCCH, PUSCH, and SRS using a medium access control (MAC) control element (CE) or downlink control information (DCI), etc.

[0007] However, the number of configurable candidates is limited, and if a large number of candidates are used and reconfiguration is performed by higher layer signaling, delays and resource consumption may occur.

[0008] Therefore, an object of the present disclosure is to provide a user terminal and a wireless communication method that appropriately control an UL beam. [Means for solving the problem]

[0009] A terminal according to an embodiment of the present disclosure includes a receiver that receives either a medium access control-control element (MAC CE) indicating one ID of a plurality of path loss measurement reference signals for uplink transmission, or a MAC CE indicating one ID of a plurality of transmission configuration indication (TCI) states for downlink reception, and a control unit that performs path loss measurement for the uplink transmission by using a downlink reference signal corresponding to the ID indicated by the MAC CE received by the receiver. However, if a higher layer parameter indicating the use of a default beam for the uplink transmission is configured, and spatial relationship information available for the uplink transmission is not configured, the downlink reference signal is a reference signal in a TCI state of a specific control resource set. do. Effect of the Invention

[0010] According to one aspect of the present disclosure, the UL beam can be appropriately controlled. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing an example of beam correspondence. [Diagram 2] FIG. 2 illustrates an example of spatial relationships for particular UL transmissions. [Diagram 3] 3A and 3B are diagrams showing an example of a QCL assumption for a PDSCH. [Figure 4] FIG. 4 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Diagram 5] FIG. 5 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 6] FIG. 6 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 7] FIG. 7 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] (TCI, spatial relations, QCL) In NR, it is considered to control reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) in a UE of at least one of a signal and a channel (referred to as a signal / channel) based on a transmission configuration indication state (TCI state).

[0013] The TCI state may represent a state that is applied to a downlink signal / channel. The equivalent of the TCI state that is applied to an uplink signal / channel may be expressed as a spatial relation.

[0014] The TCI state is information about the Quasi-Co-Location (QCL) of signals / channels, and may also be called spatial reception parameters, spatial relation information (SRI), etc. The TCI state may be configured in the UE for each channel or for each signal.

[0015] A QCL is an index that indicates the statistical properties of a signal / channel. For example, when a signal / channel and another signal / channel are in a QCL relationship, it may mean that it can be assumed that at least one of the following is the same (QCL with respect to at least one of the following) between these different signals / channels: Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter).

[0016] In addition, the spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be specified based on a spatial QCL. A QCL (or at least one element of a QCL) in the present disclosure may be replaced with a spatial QCL (sQCL).

[0017] A plurality of types of QCLs may be defined. For example, four QCL types AD may be provided, each having different parameters (or parameter sets) that may be assumed to be the same. The parameters are as follows: QCL Type A: Doppler shift, Doppler spread, mean delay and delay spread, QCL type B: Doppler shift and Doppler spread, QCL Type C: Doppler shift and mean delay, · QCL Type D: Spatial reception parameters.

[0018] The UE's assumption that a given Control Resource Set (CORESET), channel, or reference signal is in a particular QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal may be referred to as a QCL assumption.

[0019] The UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal / channel based on the TCI condition or QCL assumptions of the signal / channel.

[0020] The TCI state may be, for example, information about the QCL between a target channel (or a Reference Signal (RS) for the channel) and another signal (e.g., another Downlink Reference Signal (DL-RS)). The TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination of these.

[0021] In the present disclosure, higher layer signaling may be, for example, any one or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like.

[0022] The MAC signaling may be, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0023] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0024] The channel for which the TCI state is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0025] Also, the RS (DL-RS) related to the channel and QCL may be, for example, at least one of a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), and a Sounding Reference Signal (SRS). Alternatively, the DL-RS may be a CSI-RS (also referred to as a Tracking Reference Signal (TRS)) used for tracking, or a reference signal (also referred to as a QRS) used for QCL detection.

[0026] The SSB is a signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). The SSB may be referred to as an SS / PBCH block.

[0027] The information element of the TCI state (the "TCI-state IE" of RRC) set by upper layer signaling may include one or more QCL information ("QCL-Info"). The QCL information may include at least one of information regarding the DL-RS related to the QCL relationship (DL-RS relationship information) and information indicating the QCL type (QCL type information). The DL-RS relationship information may include information such as the index of the DL-RS (for example, the SSB index, the Non-Zero-Power (NZP) CSI-RS resource ID (Identifier)), the index of the cell where the RS is located, and the index of the Bandwidth Part (BWP) where the RS is located.

[0028] <TCI State for PDCCH> Information on the QCL between the PDCCH (or the demodulation reference signal (DeModulation Reference Signal (DMRS)) antenna port related to the PDCCH) and a predetermined DL-RS may be referred to as, for example, the TCI state for the PDCCH.

[0029] The UE may determine the TCI state for the UE-specific PDCCH (CORESET) based on upper layer signaling. For example, for each CORESET, one or more (K) TCI states may be set by RRC signaling for the UE.

[0030] For each CORESET, the UE may activate one of the multiple TCI states set by RRC signaling by means of a MAC CE. The MAC CE may be referred to as the TCI State Indication for UE-specific PDCCH MAC CE. The UE may monitor the CORESET based on the active TCI state corresponding to the CORESET.

[0031] <TCI state for PDSCH> Information on the QCL between the PDSCH (or the DMRS antenna port related to the PDSCH) and a predetermined DL-RS may be referred to as, for example, the TCI state for the PDSCH.

[0032] The UE may be notified (configured) by upper layer signaling of M (M≥1) TCI states for the PDSCH (M pieces of QCL information for the PDSCH). Note that the number M of TCI states set for the UE may be restricted by at least one of the UE capability and the QCL type.

[0033] The DCI used for scheduling the PDSCH may include a predetermined field (which may be called, for example, a TCI field, a TCI status field, etc.) indicating a TCI status for the PDSCH. The DCI may be used for scheduling the PDSCH of one cell, and may be called, for example, DL DCI, DL assignment, DCI format 1_0, DCI format 1_1, etc.

[0034] Whether or not the TCI field is included in the DCI may be controlled by information notified from the base station to the UE. The information may be information indicating whether or not the TCI field is present in the DCI (for example, TCI presence information, TCI presence information in DCI, higher layer parameter TCI-PresentInDCI). The information may be configured in the UE by, for example, higher layer signaling.

[0035] If more than eight TCI states are configured for the UE, up to eight TCI states may be activated (or specified) using a MAC CE, which may be referred to as a TCI States Activation / Deactivation for UE-specific PDSCH MAC CE. The value of the TCI field in the DCI may indicate one of the TCI states activated by the MAC CE.

[0036] If the UE is configured with TCI presence information set to "enabled" for a CORESET that schedules a PDSCH (a CORESET used for PDCCH transmission that schedules a PDSCH), the UE may assume that the TCI field is present in DCI format 1_1 of the PDCCH transmitted on that CORESET.

[0037] When TCI presence information is not set for a CORESET that schedules a PDSCH or the PDSCH is scheduled by DCI format 1_0, if the time offset between reception of DL DCI (the DCI that schedules the PDSCH) and reception of the PDSCH corresponding to the DCI is greater than or equal to a threshold, the UE may assume that the TCI state or QCL assumption for the PDSCH is identical to the TCI state or QCL assumption applied to the CORESET used for PDCCH transmission that schedules the PDSCH, in order to determine the QCL of the PDSCH antenna port.

[0038] If the TCI presence information is set to "enabled", if the TCI field in the DCI in the scheduling component carrier (CC) indicates an activated TCI state in the scheduled CC or DL ​​BWP, and the PDSCH is scheduled by DCI format 1_1, the UE may use the TCI according to the value of the TCI field in the detected PDCCH carrying the DCI to determine the QCL of the PDSCH antenna port. If the time offset between the reception of the DL DCI (scheduling the PDSCH) and the PDSCH corresponding to the DCI (the PDSCH scheduled by the DCI) is equal to or greater than a threshold, the UE may assume that the DM-RS port of the PDSCH of the serving cell is RS and QCL in the TCI state for the QCL type parameter given by the indicated TCI state.

[0039] If the UE is configured with a single-slot PDSCH, the indicated TCI state may be based on the activated TCI state in the slot with a scheduled PDSCH. If the UE is configured with a multi-slot PDSCH, the indicated TCI state may be based on the activated TCI state in the first slot with a scheduled PDSCH, and the UE may expect it to be the same across slots with scheduled PDSCH. If the UE is configured with a CORESET associated with a search space set for cross-carrier scheduling, the UE may assume that the time offset between the detected PDCCH and the PDSCH corresponding to the PDCCH is greater than or equal to a threshold if the TCI presence information for the CORESET is set to "valid" and at least one of the TCI states configured for the serving cells scheduled by the search space set includes QCL type D.

[0040] In the RRC connected mode, in both cases where the TCI information in DCI (higher layer parameter TCI-PresentInDCI) is set to "enabled" and where the TCI information in DCI is not set, if the time offset between the reception of a DL DCI (DCI scheduling a PDSCH) and the corresponding PDSCH (PDSCH scheduled by that DCI) is less than a threshold, the UE may assume that the DM-RS port of the PDSCH of the serving cell has the smallest CORESET-ID in the latest slot monitored by the UE for one or more CORESETs in the active BWP of the serving cell and is the RS and QCL for the QCL parameter used for the QCL indication of the PDCCH of the CORESET associated with the monitored search space.

[0041] The time offset between reception of a DL DCI and reception of a PDSCH corresponding to that DCI may be referred to as a scheduling offset.

[0042] Also, the above threshold may be referred to as "Threshold", "Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset", "timeDurationForQCL", schedule offset threshold, scheduling offset threshold, time duration for QCL, etc.

[0043] The scheduling offset threshold may be based on UE capabilities, for example, it may be based on the delay involved in PDCCH decoding and beam switching. Information on the scheduling offset threshold may be set by the base station using upper layer signaling, or may be transmitted from the UE to the base station.

[0044] For example, the UE may assume that the DMRS port of the above PDSCH is QCL with the DL-RS based on the TCI state activated for the CORESET corresponding to the above minimum CORESET-ID. The latest slot may be, for example, the slot in which the DCI scheduling the above PDSCH is received.

[0045] Note that the CORESET-ID may be an ID set by the RRC information element "ControlResourceSet" (ID for identifying the CORESET).

[0046] <Spatial relationship for PUCCH> The UE may be configured with parameters (PUCCH configuration information, PUCCH-Config) used for PUCCH transmission by upper layer signaling (for example, Radio Resource Control (RRC) signaling). The PUCCH configuration information may be configured for each partial bandwidth (for example, uplink bandwidth part (Bandwidthpart (BWP))) within a carrier (also referred to as a cell, component carrier, etc.).

[0047] The PUCCH configuration information may include a list of PUCCH resource set information (eg, PUCCH-ResourceSet) and a list of PUCCH spatial relationship information (eg, PUCCH-SpatialRelationInfo).

[0048] The PUCCH resource set information may include a list (eg, resourceList) of PUCCH resource indices (IDs, eg, PUCCH-ResourceId).

[0049] Also, when the UE does not have dedicated PUCCH resource configuration information (e.g., dedicated PUCCH resource configuration) provided by PUCCH resource set information in the PUCCH configuration information (before RRC setup), the UE may determine a PUCCH resource set based on a parameter (e.g., pucch-ResourceCommon) in system information (e.g., System Information Block Type1 (SIB1) or Remaining Minimum System Information (RMSI)). The PUCCH resource set may include 16 PUCCH resources.

[0050] On the other hand, when the UE has the dedicated PUCCH resource configuration information (UE dedicated uplink control channel configuration, dedicated PUCCH resource configuration) (after RRC setup), the UE may determine a PUCCH resource set according to the number of UCI information bits.

[0051] The UE determines the value of a predetermined field (e.g., a PUCCH resource indicator field) in the Downlink Control Information (DCI) (e.g., DCI format 1_0 or 1_1 used for scheduling the PDSCH) and the number of CCEs (N) in a control resource set (CONTROLL REsource SET (CORESET)) for receiving the PDCCH carrying the DCI. CCE ) and the index (n CCE,0 ), and may determine one PUCCH resource (index) in the PUCCH resource set (eg, a PUCCH resource set that is cell-specific or determined individually for the UE).

[0052] The PUCCH spatial relationship information (e.g., the RRC information element "PUCCH-spatialRelationInfo") may indicate multiple candidate beams (spatial domain filters) for PUCCH transmission. The PUCCH spatial relationship information may indicate a spatial relationship between a Reference signal (RS) and the PUCCH.

[0053] The list of PUCCH spatial relationship information may include several elements (PUCCH spatial relationship information IEs (Information Elements)). Each PUCCH spatial relationship information may include at least one of an index (ID, e.g., pucch-SpatialRelationInfoId) of the PUCCH spatial relationship information, an index (ID, e.g., servingCellId) of a serving cell, and information on an RS (reference RS) that has a spatial relationship with the PUCCH.

[0054] For example, the information regarding the RS may be an SSB index, a CSI-RS index (e.g., NZP-CSI-RS resource configuration ID), or an SRS resource ID and a BWP ID. The SSB index, the CSI-RS index, and the SRS resource ID may be associated with at least one of a beam, a resource, and a port selected by measurement of the corresponding RS.

[0055] The UE may be instructed by a MAC (Medium Access Control) CE (Control Element) to select one or more PUCCH spatial relation information (e.g., PUCCH-SpatialRelationInfo, or candidate beams) within a list of PUCCH spatial relation information. The MAC CE may be a MAC CE (PUCCH spatial relation information activation / deactivation MAC CE, PUCCH spatial relation information indication MAC CE) that activates or deactivates the PUCCH spatial relation information.

[0056] The UE may activate the PUCCH relation information specified by the MAC CE 3 ms after transmitting an acknowledgement (ACK) to the MAC CE that activates the predetermined PUCCH spatial relation information.

[0057] The UE may control the transmission of the PUCCH based on the PUCCH spatial relation information activated by the MAC CE. When a single PUCCH spatial relation information is included in the list of PUCCH spatial relation information, the UE may also control the transmission of the PUCCH based on the PUCCH spatial relation information.

[0058] <Spatial relation for SRS, PUSCH> The UE may receive information (SRS configuration information, e.g., parameters within the "SRS-Config" of the RRC control element) used for the transmission of a reference signal for measurement (e.g., a sounding reference signal (SRS)).

[0059] Specifically, the UE may receive at least one of information regarding one or more SRS resource sets (SRS resource set information, e.g., the RRC control element "SRS-ResourceSet") and information regarding one or more SRS resources (SRS resource information, e.g., the RRC control element "SRS-Resource").

[0060] An SRS resource set may be associated with (group together) a number of SRS resources, each of which may be identified by an SRS Resource Indicator (SRI) or SRS Resource Identifier (ID).

[0061] The SRS resource set information may include an SRS resource set ID (SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, an SRS resource type (e.g., Periodic SRS, Semi-Persistent SRS, or Aperiodic SRS), and information on SRS usage.

[0062] Here, the SRS resource type may indicate any one of periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic SRS (A-SRS). Note that the UE may transmit the P-SRS and SP-SRS periodically (or periodically after activation) and transmit the A-SRS based on an SRS request of the DCI.

[0063] Furthermore, the use (RRC parameter "usage" and L1 (Layer-1) parameter "SRS-SetUse") may be, for example, beam management, codebook (CB), noncodebook (NCB), antenna switching, etc. The SRS for codebook or noncodebook use may be used to determine a precoder for codebook-based or noncodebook-based PUSCH transmission based on the SRI.

[0064] For example, the UE may determine a precoder for PUSCH transmission based on the SRI, a Transmitted Rank Indicator (TRI), and a Transmitted Precoding Matrix Indicator (TPMI) in the case of codebook-based transmission. The UE may determine a precoder for PUSCH transmission based on the SRI in the case of non-codebook-based transmission.

[0065] The SRS resource information may include an SRS resource ID (SRS-ResourceId), an SRS port number, an SRS port number, a transmission Comb, an SRS resource mapping (e.g., time and / or frequency resource position, resource offset, resource period, repetition number, SRS symbol number, SRS bandwidth, etc.), hopping related information, an SRS resource type, a sequence ID, spatial relationship information of the SRS, etc.

[0066] The spatial relationship information of the SRS (e.g., the RRC information element "spatialRelationInfo") may indicate spatial relationship information between a predetermined reference signal and the SRS. The predetermined reference signal may be at least one of a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Channel State Information Reference Signal (CSI-RS), and an SRS (e.g., another SRS). The SS / PBCH block may be referred to as a Synchronization Signal Block (SSB).

[0067] The spatial relationship information of the SRS may include at least one of an SSB index, a CSI-RS resource ID, and an SRS resource ID as an index of the predetermined reference signal.

[0068] In the present disclosure, the SSB index, the SSB resource ID, and the SSBRI (SSB Resource Indicator) may be interchangeable. Also, the CSI-RS index, the CSI-RS resource ID, and the CRI (CSI-RS Resource Indicator) may be interchangeable. Also, the SRS index, the SRS resource ID, and the SRI may be interchangeable.

[0069] The spatial relationship information of the SRS may include a serving cell index, a BWP index (BWP ID), etc., corresponding to the above-mentioned predetermined reference signal.

[0070] In NR, the transmission of an uplink signal may be controlled based on the presence or absence of Beam Correspondence (BC). BC may be, for example, the ability of a node (e.g., a base station or a UE) to determine a beam (transmitting beam, Tx beam) to be used for transmitting a signal based on a beam (receiving beam, Rx beam) to be used for receiving the signal.

[0071] In addition, BC may also be called transmit / receive beam correspondence (Tx / Rx beam correspondence), beam reciprocity, beam calibration, calibrated / non-calibrated, reciprocity calibrated / non-calibrated, correspondence, agreement, etc.

[0072] As shown in Figure 1, in the BC, the gNB performs transmit beam sweeping using beams B21 to B24, and the UE performs receive beam sweeping using beams b1 to b4, so that the gNB and UE determine the gNB's beam B22 as the DL transmit beam and the UE's beam b2 as the DL receive beam based on the measurement results. The gNB also uses the determined beam B22 as the UL receive beam, and the UE also uses the determined beam b2 as the UL transmit beam.

[0073] For example, in the absence of BC, the UE may transmit an uplink signal (e.g., PUSCH, PUCCH, SRS, etc.) using the same beam (spatial domain transmit filter) as the SRS (or SRS resource) instructed by the base station based on measurement results of one or more SRSs (or SRS resources).

[0074] On the other hand, when BC is present, the UE may transmit an uplink signal (e.g., PUSCH, PUCCH, SRS, etc.) using a beam (spatial domain transmit filter) that is the same as or corresponds to the beam (spatial domain receive filter) used to receive a specified SSB or CSI-RS (or CSI-RS resource).

[0075] When the UE is configured with spatial relationship information regarding the SSB or CSI-RS and the SRS for a certain SRS resource (e.g., with BC), the UE may transmit the SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter for receiving the SSB or CSI-RS (spatial domain receive filter). In this case, the UE may assume that the UE receive beam for the SSB or CSI-RS and the UE transmit beam for the SRS are the same.

[0076] When the UE is configured with spatial relationship information regarding a certain SRS (target SRS) resource between another SRS (reference SRS) and the SRS (target SRS) (e.g., without BC), the UE may transmit the target SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter (spatial domain transmit filter) for transmitting the reference SRS. That is, in this case, the UE may assume that the UE transmit beam of the reference SRS and the UE transmit beam of the target SRS are the same.

[0077] The UE may determine the spatial relationship of the PUSCH scheduled by the DCI (e.g., DCI format 0_1) based on a value of a predetermined field (e.g., an SRS resource identifier (SRI) field) in the DCI. Specifically, the UE may use spatial relationship information of the SRS resource (e.g., the RRC information element "spatialRelationInfo") determined based on the value of the predetermined field (e.g., the SRI) for PUSCH transmission.

[0078] (Multi-TRP) In NR, one or more transmission / reception points (TRPs) (multi-TRPs) are considered to perform DL transmission to a UE using one or more panels (multi-panels). Also, it is considered that a UE performs UL transmission to one or more TRPs.

[0079] Note that multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

[0080] Each TRP of the multi-TRP may transmit a different code word (CW) and a different layer. As one form of multi-TRP transmission, non-coherent joint transmission (NCJT) is being considered.

[0081] In the NCJT, for example, TRP1 modulates and layer maps a first codeword to transmit a first PDSCH using a first number of layers (e.g., two layers) with a first precoding. TRP2 modulates and layer maps a second codeword to transmit a second PDSCH using a second number of layers (e.g., two layers) with a second precoding. These first PDSCH and second PDSCH may be assumed to be not quasi-co-located (QCL).

[0082] In addition, the multiple PDSCHs that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap with at least one of the time and frequency resources.

[0083] Meanwhile, separate HARQ-ACK is being considered as one type of Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) feedback for multi-PDSCH.

[0084] Separate HARQ-ACK corresponds to feedback in which HARQ-ACK is transmitted for each TRP on multiple uplink control channel (Physical Uplink Control Channel (PUCCH)) / uplink shared channel (Physical Uplink Shared Channel (PUSCH)) resources. The multiple PUCCH / PUSCH resources may or may not overlap (may be transmitted simultaneously).

[0085] Note that PUCCH / PUSCH may mean at least one of PUCCH and PUSCH (hereinafter, "A / B" may be similarly read as "at least one of A and B").

[0086] The DCI for scheduling the multi-PDSCH may include a PUCCH resource indicator (PRI) field. The PRI corresponds to information specifying a resource for transmitting a HARQ-ACK corresponding to the PDSCH, and may be called an ACK / NACK resource indicator (ARI).

[0087] The UE may determine, based on the PRI, a PUCCH resource for transmitting a HARQ-ACK corresponding to the multi-PDSCH.

[0088] Using separate HARQ-ACK, it is possible to transmit HARQ-ACK independently for each TRP. Even if the backhaul delay between TRPs is large (for example, the TRPs are connected with a non-ideal backhaul), the delay of HARQ is not large.

[0089] The PUCCH resources of the separate HARQ-ACK for each TRP may be configured to allow overlap in time, or may not be configured to allow overlap in time. In order to flexibly control the PUCCH resources of the separate HARQ-ACK, the definition of a PUCCH resource group is being considered.

[0090] For example, a UE in which a PUCCH resource group is configured by a network may assume that all PUCCH resources included in a first PUCCH resource group do not overlap in time with all PUCCH resources included in a second PUCCH resource group. Alternatively, a PUCCH resource group may not be explicitly configured by a network, and a UE may consider PUCCH resources configured by a network as a PUCCH resource group by grouping them according to a predetermined rule. A UE may group corresponding PUCCH resources according to a value of a PUCCH resource indicator field in a received DCI. For example, a UE may group corresponding PUCCH resources according to whether a predetermined bit position (e.g., the most significant bit or the least significant bit) of a value of a PUCCH resource indicator field (e.g., 000 to 111) is 1 or 0. Alternatively, a UE may group corresponding PUCCH resources according to a PUCCH resource ID configured by higher layer signaling from a network. For example, a UE may group corresponding PUCCH resources according to whether a PUCCH resource ID is an odd number or an even number, or whether it is greater than or smaller than a predetermined value.

[0091] For multi-TRP transmission, separate HARQ-ACK feedback may be supported. Spatial relationship information may be indicated, updated, etc. for each PUCCH resource group.

[0092] One or more PUCCH resource groups may be configured in the PUCCH resource set, and each PUCCH resource group may be assigned an ID.

[0093] In the present disclosure, a "group" may be interpreted as a grouping, a sequence, a list, a set, etc. Also, a resource group may be interpreted as one or more resources.

[0094] (Transmission power control for PUCCH) In addition, in NR, the transmission power of the PUCCH is controlled based on the TPC command (also called a value, an increase / decrease value, a correction value, an instruction value, etc.) indicated by the value of a specified field (also called a TPC command field, a first field, etc.) in the DCI.

[0095] For example, the transmission power (P PUCCH、b,f,c (i,q u ,q d , l) may be expressed by the following formula (1).

[0096] Here, the power control adjustment state may be set to have multiple states (e.g., two states) or a single state by a higher layer parameter. In addition, when multiple power control adjustment states are set, one of the multiple power control adjustment states may be identified by an index l (e.g., l∈{0,1}). The power control adjustment state may be called a PUCCH power control adjustment state, a first or second state, etc.

[0097] Furthermore, a PUCCH transmission opportunity i is a predetermined period during which the PUCCH is transmitted, and may be composed of, for example, one or more symbols, one or more slots, or the like.

[0098]

number

[0099] In formula (1), P CMAX,f,c (i) is, for example, the transmission power (also called maximum transmission power, etc.) of the user terminal set for carrier f of cell c at transmission opportunity i. O_PUCCH,b,f,c (q u ) is, for example, a parameter related to the target received power set for BWP b of carrier f of cell c at transmission opportunity i (e.g., a parameter related to a transmit power offset, also referred to as a transmit power offset P0 or a target received power parameter, etc.).

[0100] M PUCCH RB,b,f,c (i) is the number of resource blocks (bandwidth) allocated to the PUCCH for transmission opportunity i in uplink BWP b of cell c and carrier f with subcarrier spacing μ. b,f,c (q d ) is, for example, the index q of a reference signal for a downlink BWP (DL RS for path loss measurement, for example, PUCCH-PathlossReferenceRS) associated with an uplink BWP b of carrier f of cell c. d is the path loss calculated at the user terminal using

[0101] Δ F_PUCCH (F) is a higher layer parameter given for each PUCCH format. Δ TF,b,f,c (i) is the transmission power adjustment component (offset) for uplink BWP b of carrier f in cell c;

[0102] g b,f,c (i, l) is a value based on the TPC command of the power control adjustment state index l of the uplink BWP of carrier f of cell c and transmission opportunity i (e.g., power control adjustment state, cumulative value of TPC command). For example, the cumulative value of TPC command may be expressed by Equation (2).

[0103]

number

[0104] In formula (2), δ PUCCH,b,f,c (i last ,i,K PUCCH , l) is, for example, the previous PUCCH transmission opportunity i last The TPC command may be a TPC command indicated by a TPC command field value in a DCI (e.g., DCI format 1_0 or 1_1) detected in the uplink BWP b of carrier f of cell c for a subsequent transmission opportunity i, or a TPC command indicated by a TPC command field value in a DCI (e.g., DCI format 2_2) having CRC parity bits scrambled with a specific Radio Network Temporary Identifier (RNTI) (e.g., TPC-PUCCH-RNTI) (CRC-scrambled).

[0105] Note that formulas (1) and (2) are merely examples and are not limited thereto. The user terminal only needs to control the transmission power of the PUCCH based on at least one parameter exemplified in formulas (1) and (2), and additional parameters may be included or some parameters may be omitted. In addition, in the above formulas (1) and (2), the transmission power of the PUCCH is controlled for each BWP of a certain carrier of a certain cell, but this is not limited thereto. At least some of the cell, carrier, BWP, and power control adjustment state may be omitted.

[0106] (Transmission power control for PUSCH) In NR, the transmission power of the PUSCH is controlled based on a TPC command (also called a value, an increment / decrement value, a correction value, etc.) indicated by a value of a predetermined field (also called a TPC command field, a first field, etc.) in the DCI.

[0107] For example, when a UE transmits a PUSCH on a BWP b of a carrier f of a cell c using a parameter set (open loop parameter set) having an index j and a power control adjustment state index l, the transmission power (P PUSCH、b,f,c (i,j,q d , l) may be expressed by the following formula (3).

[0108] Here, the power control adjustment state may be configured to have multiple states (e.g., two states) or a single state by a higher layer parameter. In addition, when multiple power control adjustment states are configured, one of the multiple power control adjustment states may be identified by an index l (e.g., l∈{0,1}). The power control adjustment state may be called a PUSCH power control adjustment state, a first or second state, etc.

[0109] Furthermore, the PUSCH transmission opportunity i is a predetermined period during which the PUSCH is transmitted, and may be composed of, for example, one or more symbols, one or more slots, or the like.

[0110]

number

[0111] In equation (3), P CMAX,f,c(i) is, for example, the transmission power (also called maximum transmission power, etc.) of the user terminal set for carrier f of cell c at transmission opportunity i. O_PUSCH,b,f,c (j) is, for example, a parameter related to a target received power set for BWP b of carrier f of cell c at transmission opportunity i (for example, a parameter related to a transmission power offset, also referred to as a transmission power offset P0, a target received power parameter, etc.).

[0112] M PUSCH RB,b,f,c(i) is the number of resource blocks (bandwidth) allocated to the PUSCH for transmission opportunity i in uplink BWP b of carrier f with cell c and subcarrier spacing μ. b,f,c (j) is a value provided by a higher layer parameter (e.g., also called msg3-Alpha, p0-PUSCH-Alpha, fractional factor, etc.).

[0113] PL b,f,c (q d ) is, for example, the index q of a reference signal for a downlink BWP (DL RS for path loss measurement, for example, PUSCH-PathlossReferenceRS) associated with an uplink BWP b of carrier f of cell c. d is the path loss (path loss compensation) calculated at the user terminal using

[0114] Δ TF,b,f,c (i) is a transmission power adjustment component (offset, transmission format compensation) for uplink BWP b of carrier f in cell c.

[0115] f b,f,c (i, l) is a value based on the TPC command of the power control adjustment state index l of the uplink BWP of carrier f of cell c and transmission opportunity i (e.g., power control adjustment state, accumulated value of TPC command, closed loop value). For example, the accumulated value of TPC command may be expressed by Equation (4).

[0116]

number

[0117] In formula (4), δ PUSCH,b,f,c (i last ,i,K PUSCH , l) is, for example, the previous PUSCH transmission opportunity i lastThe TPC command may be a TPC command indicated by a TPC command field value in a DCI (e.g., DCI format 0_0 or 0_1) detected in an uplink BWP b of carrier f of cell c for a subsequent transmission opportunity i, or a TPC command indicated by a TPC command field value in a DCI (e.g., DCI format 2_2) having CRC parity bits scrambled with a specific RNTI (Radio Network Temporary Identifier) ​​(e.g., TPC-PUSCH-RNTI) (CRC-scrambled).

[0118] Note that formulas (3) and (4) are merely examples and are not limited thereto. The user terminal only needs to control the transmission power of the PUSCH based on at least one parameter exemplified in formulas (3) and (4), and additional parameters may be included or some parameters may be omitted. In addition, in the above formulas (3) and (4), the transmission power of the PUSCH is controlled for each BWP of a certain carrier of a certain cell, but this is not limited thereto. At least some of the cell, carrier, BWP, and power control adjustment state may be omitted.

[0119] If the UE is not provided with a DL RS for path loss measurement (e.g., PUSCH-PathlossReferenceRS) or if the UE is not provided with dedicated higher layer parameters, the UE shall use RS resources from the SSB used to obtain the Master Information Block (MIB) to obtain the PL b,f,c (q d ) may be calculated.

[0120] When the UE is configured with a number of RS resource indexes up to the maximum number of DL RSs for path loss measurement (e.g., a value of maxNrofPUSCH-PathlossReferenceRS) and a set of respective RS configurations for the RS resource indexes by the DL RSs for path loss measurement, the set of RS resource indexes may include one or both of a set of SS / PBCH block indexes and a set of CSI-RS resource indexes. The UE may select RS resource index q in the set of RS resource indexes. d may be identified.

[0121] If a PUSCH transmission is scheduled by a Random Access Response (RAR) UL grant, the UE shall use the same RS resource index q as for the corresponding PRACH transmission. d may also be used.

[0122] If the UE is provided with a configuration of PUSCH power control by SRI (e.g., SRI-PUSCH-PowerControl) and one or more values ​​of the ID of the DL RS for path loss measurement, the UE may obtain a mapping between a set of values ​​for the SRI field in DCI format 0_1 ​​and a set of ID values ​​of the DL RS for path loss measurement from higher layer signaling (e.g., sri-PUSCH-PowerControl-Id in SRI-PUSCH-PowerControl). The UE may obtain the RS resource index q from the ID of the DL RS for path loss measurement mapped to the SRI field value in DCI format 0_1 ​​that schedules the PUSCH. d may be determined.

[0123] If a PUSCH transmission is scheduled by DCI format 0_0 and the UE is not provided with PUCCH spatial relationship information for the PUCCH resource with the lowest index for the active UL BWP b of each carrier f and serving cell c, the UE shall select the PUCCH resource with the same RS resource index q as the PUCCH transmission in that PUCCH resource. dmay also be used.

[0124] If the PUSCH transmission is scheduled by DCI format 0_0 and the UE is not provided with spatial settings of the PUCCH transmission, or if the PUSCH transmission is scheduled by DCI format 0_1 ​​that does not include an SRI field, or if the UE is not provided with a power control setting of the PUSCH by the SRI, the UE shall select RS resource index q with an ID of the DL RS for path loss measurement set to zero. d may also be used.

[0125] For a PUSCH transmission configured by a configured grant configuration (e.g., ConfiguredGrantConfig), if the configured grant configuration includes a predetermined parameter (e.g., rrc-ConfiguredUplinkGrant), a path loss reference index (e.g., pathlossReferenceIndex) in the predetermined parameter is used to determine the RS resource index q d may be provided to the UE.

[0126] For the PUSCH transmission configured by the configuration grant configuration, if the configuration grant configuration does not include a predetermined parameter, the UE may determine an RS resource index q from the value of the ID of the DL RS for path loss measurement mapped to the SRI field in the DCI format that activates the PUSCH transmission. d If the DCI format does not include an SRI field, the UE may determine an RS resource index q with an ID of the DL RS for path loss measurement set to zero. d may be determined.

[0127] (How spatial relationships are determined) As described above, for PDCCH or PDSCH, the UE may be configured with multiple TCI states by RRC and may be instructed to one of the multiple TCI states by MAC CE or DCI. Therefore, the beam can be switched quickly without performing RRC reconfiguration.

[0128] The maximum number of TCI states configurable by RRC (maxNrofTCI-States) is 128, and the maximum number of TCI states for PDCCH (maxNrofTCI-StatesPDCCH) is 64.

[0129] For PUCCH, the UE may have eight spatial relationships configured by RRC for one PUCCH resource and one spatial relationship indicated by the MAC CE. To use a spatial relationship other than the eight spatial relationships configured by RRC, an RRC reconfiguration is required.

[0130] When using codebook-based transmission for PUSCH, the UE may be configured with two SRS resources by RRC and one of the two SRS resources may be indicated by DCI (1-bit field). When using non-codebook-based transmission for PUSCH, the UE may be configured with four SRS resources by RRC and one of the four SRS resources may be indicated by DCI (2-bit field). To use a spatial relationship other than the two or four spatial relationships configured by RRC, RRC reconfiguration is required.

[0131] The spatial relationship of the SRS resources used for the PUSCH can be configured for DL-RS. For SP-SRS, the UE can have the spatial relationship of multiple (e.g., up to 16) SRS resources configured by RRC and can be instructed to one of the multiple SRS resources by the MAC CE. For A-SRS and P-SRS, the UE cannot have the spatial relationship of the SRS resources instructed by the MAC CE.

[0132] In this way, it may be necessary to set many spatial relationship candidates at once as the spatial relationship for UL transmission (PUCCH, PUSCH, or SRS). For example, when DL-RS (DL TCI state) is used as the spatial relationship for UL transmission by beam correspondence, many DL-RS (e.g., 32 SSBs) may be set.

[0133] However, as mentioned above, the number of spatial relationship candidates that can be set at one time for UL transmission is limited, which is smaller than the number of TCI state candidates that can be set at one time for DL ​​transmission. In order to use a spatial relationship that is not set for UL transmission, it is possible to set a different spatial relationship by RRC reconfiguration. When RRC reconfiguration is performed, there is a risk of degradation of system performance due to the occurrence of periods when communication is unavailable and the consumption of resources.

[0134] Therefore, the inventors have conceived a method in which the UE assumes that the spatial relationship of a particular uplink transmission is the same as the transmission control indication (TCI) state or quasi-co-location (QCL) assumption of a particular downlink channel.

[0135] Also, while the UE determines the spatial relationship of a particular uplink transmission, it is not clear how the UE determines the power control parameters for a particular uplink transmission.

[0136] Therefore, the inventors have conceived a method for the UE to determine the spatial relationship and power control parameters for a particular uplink transmission.

[0137] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0138] In this disclosure, spatial relationship may be interpreted as spatial relationship information, spatial relationship assumption, spatial domain transmit filter, UE spatial domain transmit filter, spatial domain filter, UE transmit beam, UL transmit beam, DL-RS, QCL assumption, SRI, spatial relationship based on SRI, etc.

[0139] The TCI state may be read as a TCI state or a QCL assumption, a QCL assumption, a spatial domain receive filter, a UE spatial domain receive filter, a spatial domain filter, a UE receive beam, a DL receive beam, a DL-RS, etc. The RS of QCL type D, the DL-RS associated with QCL type D, the DL-RS with QCL type D, the source of the DL-RS, the SSB, and the CSI-RS may be read as each other.

[0140] In the present disclosure, the TCI state may be information about a receive beam (spatial domain receive filter) instructed (configured) for the UE (e.g., DL-RS, QCL type, cell in which DL-RS is transmitted, etc.). The QCL assumption may be information about a receive beam (spatial domain receive filter) assumed by the UE based on transmission or reception of an associated signal (e.g., PRACH, DL-RS, QCL type, cell in which DL-RS is transmitted, etc.).

[0141] In the present disclosure, PCell, primary secondary cell (PSCell), and special cell (SpCell) may be interpreted as interchangeable.

[0142] In the present disclosure, "not less than x" and "greater than x" may be interpreted as interchangeable. In the present disclosure, "less than x" and "not more than x" may be interpreted as interchangeable.

[0143] (Wireless communication method) <Embodiment 1> The UE may use the default spatial relationship or the spatial relationship of the reference UL transmission for the spatial relationship of the specific UL transmission. The UE may assume (consider) that the spatial relationship of the specific UL transmission is the same as the RS of the default spatial relationship or the RS of the spatial relationship of the reference UL transmission.

[0144] The specific UL transmission may be interpreted as a specific UL signal or a specific UL channel, or as at least one of a PUSCH, a PUCCH, an SRS, an SRS resource set whose usage is codebook transmission or non-codebook transmission (having usage information indicating codebook transmission or non-codebook transmission), and an SRS resource in an SRS resource set whose usage is codebook transmission or non-codebook transmission.

[0145] The spatial relationship of the specific UL transmission, the spatial relationship RS of the specific UL transmission, the spatial relationship of the SRS configuration information, the PUCCH spatial relationship information, the spatial relationship of the PUSCH, the spatial relationship information of the specific UL transmission, the spatial relationship RS of the specific UL transmission, and the spatial domain transmission filter of the specific UL transmission may be interpreted as mutually interchangeable. If the specific UL transmission is a PUSCH, the spatial relationship of the specific UL transmission may be interpreted as an SRI, a spatial relationship of the SRI, and a spatial domain transmission filter.

[0146] The default spatial relationship, a specific RS, a TCI state or QCL assumption for a specific DL transmission, an RS relating to a QCL parameter (QCL parameter) given by a TCI state or QCL assumption for a specific DL transmission, and an RS of QCL type D in a TCI state or QCL assumption for a specific DL transmission may be interpreted as being interchangeable.

[0147] The specific DL transmission may be interpreted as at least one of a specific DL channel, a specific RS, a specific DL RS, a PDCCH, and a PDSCH.

[0148] The reference UL transmission may be an UL transmission that satisfies a predetermined condition, or may be the latest PUSCH transmission, or may be the latest PUCCH transmission, or may be the latest PRACH transmission, or may be the latest SRS transmission, or may be the latest UL transmission, or may be the latest transmission of at least one of the PUSCH, PUCCH, PRACH, and SRS.

[0149] It is preferable to use the QCL type D RS in the TCI state or QCL assumption of the specific DL transmission for determining the UE receiving beam (spatial domain receiving filter) as the spatially related RS of the specific UL transmission for determining the UL transmitting beam (spatial domain transmitting filter). In particular, when the TCI state or QCL assumption of the specific DL transmission has both the QCL type A RS and the QCL type D RS, and the QCL type A RS and the QCL type D RS are different from each other, it is preferable to use the QCL type D RS in the TCI state or QCL assumption of the specific DL transmission as the spatially related RS of the specific UL transmission.

[0150] For example, as described above, when a TCI state indicates a QCL type A RS that is a TRS of a serving cell (e.g., SCell) in which the TCI state is configured, and a QCL type D RS that is a CSI-RS of another serving cell (e.g., PCell) in which repetition is configured, the QCL type A RS and the QCL type D RS are different from each other. Since the parameters of QCL type A may differ depending on the cell, it is preferable that the QCL type A RS is transmitted in a cell in which the TCI state is configured. On the other hand, the QCL type D RS may be transmitted in a serving cell other than the cell in which the TCI state is configured. Note that the serving cell in which the TCI state is configured may be a PCell, and the serving cell in which the QCL type D RS is transmitted may be an SCell.

[0151] As shown in FIG. 2, the UE may use a QCL type D RS in a TCI state (e.g., DL-RS, spatial domain receive filter, spatial domain filter, UE receive beam) for a particular DL transmission as an RS in a spatial relationship (e.g., DL-RS, spatial domain transmit filter, spatial domain filter, UE transmit beam) for a particular UL transmission.

[0152] Conditions for applying default spatial relationships When the UE is implicitly or explicitly configured to use the default spatial relationship for the spatial relationship of a specific UL transmission, the UE may use the default spatial relationship for the spatial relationship of the specific UL transmission (the spatial relationship of the specific UL transmission may be assumed to be the same as the default spatial relationship). The case in which the UE is implicitly configured to use the default spatial relationship for the spatial relationship of a specific UL transmission may be, for example, a case in which the UE is not configured with a spatial relationship (e.g., spatialRelationInfo, PUCCH-SpatialRelationInfo) for a specific UL transmission. The case in which the UE is explicitly configured to use the default spatial relationship for the spatial relationship of a specific UL transmission may be a case in which a specific parameter is configured by a specific higher layer parameter.

[0153] In Frequency Range 1 (FR1, frequencies below 6 GHz), the UE may not use analog beamforming for UL transmissions, nor may it have a spatial relationship configured for UL transmissions.

[0154] In Frequency Range 2 (FR2, frequencies above 6 GHz (or frequencies above 24 GHz)), the UE may assume that the spatial relationship of a specific UL transmission is the same as the default spatial relationship (the RS of the spatial relationship of a specific UL transmission is the same as the RS of QCL type D in the TCI state of a specific DL transmission). In FR2, the UE may assume that the spatial relationship of a specific UL transmission is the same as the default spatial relationship if the UE is implicitly or explicitly configured to use the default spatial relationship for the spatial relationship of the specific UL transmission.

[0155] If the UE is capable of applying the QCL type D RS in the TCI state of the specific DL transmission, the UE may assume that the spatial relationship of the specific UL transmission is the same as the QCL type D RS in the TCI state of the specific DL transmission. If the UE is capable of applying the QCL type D RS in the TCI state of the specific DL transmission and is implicitly or explicitly configured to use the default spatial relationship for the spatial relationship of the specific UL transmission, the UE may assume that the spatial relationship of the specific UL transmission is the same as the default spatial relationship.

[0156] In FR2, the UE may assume that the spatial relationship RS of a specific UL transmission is the same as the QCL type D RS in the TCI state of a specific DL transmission if the QCL type D RS in the TCI state of a specific DL transmission is applicable. In FR2, the UE may assume that the spatial relationship RS of a specific UL transmission is the same as the QCL type D RS in the TCI state of a specific DL transmission if the QCL type D RS in the TCI state of a specific DL transmission is applicable and the UE is implicitly or explicitly configured to use the default spatial relationship for the spatial relationship of the specific UL transmission.

[0157] If the UE is implicitly or explicitly configured to use the default spatial relationship for an SRS resource set (or SRS resources within the SRS resource set) whose usage is codebook transmission or non-codebook transmission, the UE may assume that the spatial relationship for a specific UL transmission is the same as the default spatial relationship. In FR2, if the UE is implicitly or explicitly configured to use the default spatial relationship for an SRS resource set (or SRS resources within the SRS resource set) whose usage is codebook transmission or non-codebook transmission, the UE may assume that the spatial relationship for a specific UL transmission is the same as the default spatial relationship. In FR2, if the UE is implicitly or explicitly configured to use the default spatial relationship for an SRS resource set (or SRS resources within the SRS resource set) whose usage is codebook transmission or non-codebook transmission, the UE may assume that the spatial relationship for the SRS resources is the same as the default spatial relationship.

[0158] If the UE uses the default spatial relationship for the SRS spatial relationship when the purpose of the SRS resource set is beam management, the same beam (default spatial relationship) will be used for all SRS symbols, and the UE cannot sweep the beam of the SRS. Only when the purpose of the SRS resource set is codebook transmission or non-codebook transmission, the UE can sweep the beam when the purpose of the SRS resource set is beam management by using the default spatial relationship for the SRS spatial relationship.

[0159] When a UE is configured with a predetermined feature in Rel.16 or later, the UE may assume that the spatial relationship of a specific UL transmission is the same as the default spatial relationship (the RS of the spatial relationship of the specific UL transmission is the same as the RS of QCL type D in the TCI state of the specific DL transmission). When a UE is configured with a predetermined feature and is configured implicitly or explicitly to use the default spatial relationship for the spatial relationship of a specific UL transmission, the UE may assume that the spatial relationship of a specific UL transmission is the same as the default spatial relationship.

[0160] The predetermined function may be a beam-related function in Rel. 16 or later. The predetermined function may be configured in the UE by higher layer signaling. The beam-related function may be at least one of low latency beam selection, Layer 1 (L1)-Signal to Interference plus Noise Ratio (SINR) beam reporting, and BFR on a secondary cell (SCell). The low latency beam selection may be referred to as fast beam selection, beam selection w / o TCI state, beam selection type II, TCI state designation type 2, etc. The L1-SINR beam reporting may be that the UE reports the L1-SINR measurement result (CSI, L1-SINR corresponding to the beam) for beam management. BFR on a SCell may be at least one of detecting a beam failure (BF) in the SCell, sending a beam failure recovery request (BFRQ) to the SCell, and receiving a beam failure recovery (BFR) response from the SCell.

[0161] The UE may report specific UE capability information. The specific UE capability information may indicate that the UE supports assuming that the spatial relation of the specific UL transmission is the same as the default spatial relation (the RS of the spatial relation of the specific UL transmission is the same as the RS of QCL type D in the TCI state of the specific DL transmission), or may indicate that the UE supports the above-mentioned predetermined function. The specific UE capability information may be a parameter indicating that the default spatial relation is supported, or may be a parameter having a name indicating either the default spatial relation or the default spatial relation information. When the UE reports the specific UE capability information, the UE may assume that the spatial relation of the specific UL transmission is the same as the default spatial relation. When the UE reports the specific UE capability information and is configured implicitly or explicitly to use the default spatial relation for the spatial relation of the specific UL transmission, the UE may assume that the spatial relation of the specific UL transmission is the same as the default spatial relation. When the UE does not report the specific UE capability information, the UE may assume that the spatial relation of the specific UL transmission is configured.

[0162] A UE that supports the default spatial relationship may report UE capability information indicating that it supports the default spatial relationship.

[0163] A UE that supports the default spatial relationship may report UE capability information indicating a channel type that supports the default spatial relationship. The channel type may be at least one of a PUCCH, an SRS, and a PUSCH.

[0164] A UE that supports the default spatial relationship may report UE capability information indicating a QCL source type that supports the default spatial relationship. The QCL source type may be at least one of CORESET, PDCCH, and PDSCH.

[0165] UEs that do not support the default spatial relationship (e.g., UEs that do not report that they support the default spatial relationship, UEs that report that they do not support the default spatial relationship) may use the spatial relationship of the reference UL transmission instead of the default spatial relationship. In other words, UEs that do not support the default spatial relationship may assume that the spatial relationship of a particular UL transmission is the same as the spatial relationship of the reference UL transmission.

[0166] By reporting specific UE capability information, the overhead of notification (at least one of configuration and activation) regarding spatial relationship information can be reduced.

[0167] TCI state, QCL assumption, or RS used as default spatial relation The default spatial relationship may be a TCI state for a particular DL transmission or a QCL assumption for a particular DL transmission. This TCI state or QCL assumption may be explicitly configured (activated, indicated) to the UE by RRC signaling, MAC CE, and / or DCI, or may be determined by the UE based on measurements of SSB or CSI-RS. This TCI state or QCL assumption may be the RS used for the reference UL transmission.

[0168] The default spatial relationship may be interpreted as an active TCI state (activated TCI state), an active TCI state or a QCL assumption, etc.

[0169] Multiple TCI states may be active for a particular DL transmission, in which case the default spatial relationship may be the default TCI state (default RS, default TCI state or QCL assumption).

[0170] The default TCI state may be interpreted as an RS for the QCL parameters used for the QCL indication of the PDCCH of the CORESET that has the lowest CORESET-ID in the latest slot monitored by the UE and is associated with the monitored search space, where one or more CORESETs in the active BWP of the serving cell have the lowest CORESET-ID in the latest slot monitored by the UE, or may be interpreted as a TCI state or QCL assumption of the CORESET that has the lowest CORESET-ID in the latest slot and is associated with the monitored search space, or may be interpreted as an RS for the QCL parameters used for the QCL indication of the PDCCH of the CORESET that has the lowest CORESET-ID in the latest slot and is associated with the monitored search space, where one or more CORESETs in the active BWP of the serving cell have the lowest CORESET-ID in the latest slot and is associated with the monitored search space, where It may be read as the TCI state or QCL assumption of the selected CORESET, or as the TCI state or QCL assumption of a specific CORESET, or as the TCI state or QCL assumption of a DL transmission corresponding to a specific UL transmission (or a DL channel that triggers a specific UL transmission, a DL channel that schedules a specific UL transmission, or a DL channel that schedules a DL channel corresponding to a specific UL transmission) (e.g., an RS of QCL type D in the TCI state or QCL assumption), or as an RS regarding the QCL parameters of a specific DL transmission (an RS that is a specific DL transmission and a QCL (e.g., an RS of QCL type D)).

[0171] The specific slot may be the latest slot in a PDSCH reception or the latest slot in a specific UL transmission. The specific CORESET may be a CORESET specified by higher layer signaling (e.g., spatial relationship information of a specific UL transmission).

[0172] The CORESET used for the default TCI state may or may not include CORESET0.

[0173] The default spatial relationship may be the spatial relationship of the reference UL transmission.

[0174] The default spatial relationship may be the RS (RS resource index, SSB index, CSI-RS resource index) corresponding to the PRACH resource or PRACH occasion used for the latest PRACH transmission.

[0175] If the specific UL transmission is a PUSCH of a cell, the specific DL transmission may be a PUCCH resource with the lowest ID in the active UL BWP of the cell, or a PUCCH resource group with the lowest ID in the active UL BWP of the cell.

[0176] If the specific UL transmission is a PUCCH, the specific DL transmission may be a PDCCH corresponding to the PUCCH (a PDCCH that schedules a PDSCH corresponding to a HARQ-ACK carried by the PUCCH), or a PDSCH corresponding to a HARQ-ACK carried by the PUCCH. If the specific UL transmission is a PUSCH, the specific DL transmission may be a PDCCH that schedules the PUSCH, a PDCCH that schedules a PDSCH corresponding to a HARQ-ACK carried by the PUSCH, or a PDSCH corresponding to a HARQ-ACK carried by the PUSCH. If the specific UL transmission is an A-SRS, the specific DL transmission may be a PDCCH that triggers the A-SRS. If the specific UL transmission is an UL transmission triggered by a MAC CE, such as an SP-SRS, the specific DL transmission may be a PDCCH that schedules the MAC CE, or a PDSCH that carries the MAC CE.

[0177] For example, if the specific UL transmission is a PUCCH (or PUSCH) carrying an HARQ-ACK, the specific DL transmission may be a PDCCH indicating the resources of the PUCCH (a PDCCH that schedules a PDSCH corresponding to the HARQ-ACK), or a PDSCH corresponding to the HARQ-ACK (used to generate the HARQ-ACK).

[0178] The particular DL transmission may be the latest PDSCH.

[0179] The specific DL transmission may be configured in the UE by higher layer signaling or may be specified in a specification.

[0180] The specific DL transmission may be a DL RS for path loss measurement (e.g., a pathlossReferenceRS in an SRS-ResourceSet in an SRS-Config, a PUCCH-PathlossReferenceRS in a PUCCH-PowerControl in a PUCCH-Config, or a PUSCH-PathlossReferenceRS in a PUSCH-PowerControl in a PUSCH-Config). The DL RS for path loss measurement may be a CSI-RS or an SSB.

[0181] When a DL RS for path loss measurement is configured by higher layer signaling, the UE may use the configured DL RS for path loss measurement as a default spatial relationship. When a DL RS for path loss measurement is not configured by higher layer signaling, the UE may use an RS resource from an SSB used by the UE to obtain an MIB as a DL RS for path loss measurement, and may use the determined DL RS for path loss measurement as the default spatial relationship. In addition, the UE may use the ID (RS resource index q) of the DL RS for path loss measurement for PUSCH transmission as described in the above "Transmission power control for PUSCH". d ) and use the determined DL RS for path loss measurement as the default spatial relationship.

[0182] When the default spatial relationship is in the TCI state or QCL assumption, the DL RS for the spatial relationship of the specific UL transmission and the DL RS for path loss measurement for power control of the specific UL transmission may be different. By making the DL RS for the spatial relationship of the specific UL transmission and the DL RS for path loss measurement for power control of the specific UL transmission common, the power control of the specific UL transmission can be appropriately performed.

[0183] DL and UL Time Offset When the UE is implicitly or explicitly configured to use a default spatial relationship for the spatial relationship of a specific UL transmission, if the time offset between reception of a DCI (e.g., a DCI scheduling a specific DL transmission) and reception of the specific DL transmission is equal to or greater than a threshold, the UE may assume that the spatial relationship (e.g., the RS of the spatial relationship) of the specific UL transmission is the same as the TCI state or QCL assumption (e.g., the RS of QCL type D in the TCI state or QCL assumption) applied to the CORESET used for the PDCCH transmission scheduling the specific DL transmission.

[0184] If the UE is implicitly or explicitly configured to use a default spatial relationship for the spatial relationship of a specific UL transmission, or if the UE is configured with specific parameters by specific higher layer parameters, then if the time offset between the reception of a DCI (e.g., a DCI scheduling a specific DL transmission) and the reception of the specific DL transmission is less than a threshold, the UE may assume that the spatial relationship of the specific UL transmission (e.g., the RS of the spatial relationship) is the same as the default spatial relationship.

[0185] When TCI presence information (e.g., higher layer parameter TCI-PresentInDCI) is not set for a CORESET that schedules a PDSCH or the PDSCH is scheduled by DCI format 1_0, if the time offset between reception of a DL DCI (e.g., a DCI that schedules the PDSCH) and reception of a PDSCH corresponding to the DCI is greater than or equal to a threshold, the UE may assume that the spatial relationship (e.g., spatially related RS) of a PUCCH (or PUSCH) carrying a HARQ-ACK for the PDSCH is identical to the TCI state or QCL assumption (e.g., QCL type D RS in the TCI state or QCL assumption) applied to the CORESET used for PDCCH transmission that schedules the PDSCH.

[0186] When the TCI presence information is set to "enabled", if the TCI field in the DCI in the scheduling component carrier (CC) indicates an activated TCI state in the scheduled CC or DL ​​BWP, and the PDSCH is scheduled by DCI format 1_1, the UE may use the TCI according to the value of the TCI field in the detected PDCCH with DCI to determine the spatial relationship of the PUCCH (or PUSCH) carrying the HARQ-ACK to the PDSCH. If the time offset between the reception of the DL DCI (scheduling the PDSCH) and the PDSCH corresponding to the DCI is equal to or greater than a threshold, the UE may assume that the spatial relationship (e.g., spatial relationship RS) of the PUCCH (or PUSCH) carrying the HARQ-ACK to the PDSCH is the QCL with the RS (e.g., RS of QCL type D) in the TCI state for the QCL type parameter given by the indicated TCI state (e.g., FIG. 3A).

[0187] In the RRC connected mode, in both cases where the TCI presence information is set to "enabled" and where the TCI information in the DCI is not set, If the time offset between the reception of a DCI (DCI scheduling a PDSCH) and the corresponding PDSCH (PDSCH scheduled by the DCI) is less than a threshold, the UE may assume that the spatial relationship (e.g., spatially related RS) of the PUCCH (or PUSCH) carrying the HARQ-ACK for the PDSCH is the RS and QCL for the QCL parameter used for the QCL indication of the PDCCH of the CORESET associated with the monitored search space for which one or more CORESETs in the active BWP of the serving cell have the lowest CORESET-ID in a particular slot (e.g., the latest slot) monitored by the UE (e.g., Figure 3B), or may assume that the spatial relationship of the PUCCH (or PUSCH) carrying the HARQ-ACK for the PDSCH is the RS and QCL for the QCL parameter of the PDSCH (the PDSCH (DM-RS port of the PDSCH, antenna port of the PDSCH) and the RS that is the QCL (e.g., RS of QCL type D)).

[0188] The specific slot may be the latest slot in a PDSCH corresponding to a specific UL transmission (e.g., a PDSCH corresponding to a HARQ-ACK carried by the specific UL transmission). In this case, the UE can make the beam (spatial domain receive filter) of the PDSCH and the beam (spatial domain transmit filter) of the specific UL transmission the same by using an RS related to the QCL parameters associated with the CORESET of the latest slot for the PDSCH in the spatial relationship of the specific UL transmission, thereby avoiding the process of changing the beam and reducing the processing load.

[0189] The specific slot may be the latest slot in the specific UL transmission. In this case, the UE can make the beam (spatial domain receive filter) of the latest PDCCH and the beam (spatial domain transmit filter) of the specific UL transmission the same by using the RS related to the QCL parameters associated with the CORESET of the latest slot for the specific UL transmission in the spatial relationship of the specific UL transmission, thereby avoiding the process of changing the beam and reducing the processing load.

[0190] <Examples of implicit or explicit settings> The case in which the UE is implicitly or explicitly configured to use the default spatial relationship for the spatial relationship of a specific UL transmission may be restated by at least one of the following cases 1 to 5.

[0191] <<Case 1>> If there is no specific field in a specific higher layer parameter (e.g., an RRC information element) (if information of a specific field is not set in a specific higher layer parameter), the UE may assume that the spatial relationship of the specific UL transmission is the same as the default spatial relationship (the RS of the spatial relationship of the specific UL transmission is the same as the RS of QCL type D in the TCI state of the specific DL transmission).

[0192] The specific upper layer parameters may be SRS configuration information (SRS-Config), PUCCH configuration information (PUCCH-Config), and so on.

[0193] If there is no specific field in the SRS resource information (SRS-Resource) in the SRS configuration information (SRS-Config), the UE may assume that the spatial relationship of the specific UL transmission is the same as the default spatial relationship. The specific field may be spatial relationship information (spatialRelationInfo), which is a setting of the spatial relationship between a reference RS (e.g., SSB, CSI-RS, or SRS) and a target SRS.

[0194] In FR2, if an SRS resource in an SRS resource set whose usage is codebook transmission or non-codebook transmission does not include spatial relationship information, the UE may assume that the spatial relationship for that SRS resource is the same as the default spatial relationship.

[0195] If the SRS resource set information (SRS-ResourceSet) in the SRS configuration information (SRS-Config) indicates that the SRS resource set information is used for codebook-based transmission or non-codebook-based transmission (the usage in the SRS resource set information indicates codebook or non-codebook), and there is no specific field in the SRS resource information (SRS-Resource) indicating the SRS resource in the SRS resource set, the UE may assume that the spatially related RS of the PUSCH is the same as the QCL type D RS in the active TCI state of the specific DL transmission. The specific field may be spatial relationship information (spatialRelationInfo).

[0196] If the usage in the SRS resource set information indicates codebook or non-codebook, and there is no specific field in the SRS resource information (SRS-Resource) indicating the SRS resource in the SRS resource set, the UE may assume that the spatially related RS of the PUSCH is the same as the QCL type D RS in the active TCI state of the specific DL transmission. The specific field may be spatial relationship information (spatialRelationInfo).

[0197] If there is no specific field in the PUCCH configuration information (PUCCH-Config), the UE may assume that the spatially related RS of the PUCCH is the same as the RS of QCL type D in the active TCI state of the specific DL transmission. The specific field may be an element of a list (spatialRelationInfoToAddModList). The element may be PUCCH spatial relationship information (PUCCH-SpatialRelationInfo) used to configure the spatial setting for the PUCCH transmission.

[0198] <<Case 2>> A specific higher layer parameter (e.g., an RRC information element) may indicate the specific parameter. If a specific parameter (information on the TCI state or QCL assumption is set) is set by the specific higher layer parameter (if the specific higher layer parameter indicates the specific parameter, if the specific higher layer parameter includes a field for the specific parameter), the UE may assume that the spatial relationship of the specific UL transmission is the same as the default spatial relationship (the RS of the spatial relationship of the specific UL transmission is the same as the RS of QCL type D in the TCI state of the specific DL transmission).

[0199] The specific higher layer parameter may be SRS configuration information (SRS-Config), PUCCH configuration information (PUCCH-Config), spatial relationship information (e.g., spatialRelationInfo, PUCCH-SpatialRelationInfo), reference signal information (referenceSignal) in the spatial relationship information, a type in the spatial relationship information, etc. Also, the specific parameter may be one of the options of the reference signal information or the type.

[0200] The specific parameter may be a parameter (e.g., TCI state) indicating that the TCI state of a specific DL transmission is used for the spatial relationship of a specific UL transmission, or a parameter (e.g., default) indicating that the RS of the spatial relationship of a specific UL transmission is a default spatial relationship, or a parameter (e.g., CORESET) indicating that the spatial relationship of a specific UL transmission is the same as the TCI state of CORESET, or a parameter (e.g., ControlRS) indicating that the RS of the spatial relationship of a specific UL transmission is the same as the RS of QCL type D in the TCI state of a specific DL transmission.

[0201] For example, if CORESET is configured by the spatial relationship information (if the spatial relationship information indicates CORESET, if the spatial relationship information includes a CORESET field), the UE may assume that the spatially related RS of a particular UL transmission is identical to the QCL type D RS in the TCI state of a particular DL transmission.

[0202] When a specific parameter is configured by the SRS resource information (SRS-Resource) in the SRS configuration information (SRS-Config), the UE may assume that the spatially related RS of a specific UL transmission is identical to the QCL type D RS in the active TCI state of a specific DL transmission.

[0203] In FR2, the UE may assume that if an SRS resource set (or an SRS resource within the SRS resource set) whose usage is codebook transmission or non-codebook transmission includes a specific parameter, the spatial relationship for the SRS resource set (or an SRS resource within the SRS resource set) is the same as the default spatial relationship.

[0204] When the SRS resource set information (SRS-ResourceSet) in the SRS configuration information (SRS-Config) indicates that the SRS resource set information is used for codebook-based transmission or non-codebook-based transmission (the usage in the SRS resource set information indicates codebook or non-codebook), and a specific parameter is configured by the SRS resource information (SRS-Resource) (or spatial relation information (spatialRelationInfo)) indicating an SRS resource in the SRS resource set, the UE may assume that the spatially related RS of the PUSCH is identical to the QCL type D RS in the active TCI state of the specific DL transmission.

[0205] If a specific parameter is configured by the PUCCH configuration information (PUCCH-Config), the UE may assume that the spatially related RS of the PUCCH is the same as the RS of QCL type D in the active TCI state of the specific DL transmission. The specific parameter may be in an element of a list (spatialRelationInfoToAddModList). The element may be PUCCH spatial relationship information (PUCCH-SpatialRelationInfo) used to configure the spatial setting for the PUCCH transmission.

[0206] When CORESET is configured by the PUCCH configuration information (PUCCH-Config), the UE may assume that the spatially related RS of PUCCH is identical to the QCL type D RS in the TCI state of CORESET.

[0207] <<Case 3>> If a specific RS is not configured in the specific upper layer parameters (the specific upper layer parameters do not include a specific RS), the UE may assume that the spatial relationship of the specific UL transmission is identical to the default spatial relationship (the RS of the spatial relationship of the specific UL transmission is identical to the RS of QCL type D in the TCI state of the specific DL transmission).

[0208] The specific higher layer parameter may be SRS configuration information (SRS-Config), spatial relation information (spatialRelationInfo), PUCCH configuration information (PUCCH-Config), PUCCH spatial relation information (PUCCH-SpatialRelationInfo), and so on.

[0209] The specific RS may be any one of SRS, SSB, and CSI-RS. When the specific RS is not configured in the specific upper layer parameters, none of SRS, SSB, and CSI-RS may be configured in the specific upper layer parameters.

[0210] If a specific RS is not configured in the SRS resource information (SRS-Resource) in the SRS configuration information (SRS-Config), the UE may assume that the spatially related RS of the specific UL transmission is the same as the RS of QCL type D in the active TCI state of the specific DL transmission. The specific RS may be the RS (referenceSignal) in the spatial relationship information (spatialRelationInfo).

[0211] In FR2, if an SRS resource set (or an SRS resource within the SRS resource set) whose usage is codebook transmission or non-codebook transmission does not include a specific RS, the UE may assume that the spatial relationship for the SRS resource set (or an SRS resource within the SRS resource set) is the same as the default spatial relationship.

[0212] When the SRS resource set information (SRS-ResourceSet) in the SRS configuration information (SRS-Config) indicates that the SRS resource set information is used for codebook-based transmission or non-codebook-based transmission (the usage in the SRS resource set information indicates codebook or non-codebook), and a specific RS is not configured in the SRS resource information (SRS-Resource) indicating an SRS resource in the SRS resource set, the UE may assume that the spatially related RS of the PUSCH is the same as the RS of QCL type D in the active TCI state of the specific DL transmission. The specific RS may be the RS (referenceSignal) in the spatial relationship information (spatialRelationInfo).

[0213] If a specific RS is not configured in the PUCCH configuration information (PUCCH-Config), the UE may assume that the spatially related RS of the PUCCH is the same as the RS of QCL type D in the active TCI state of the specific DL transmission. The specific RS may be the RS (referenceSignal) in the PUCCH spatial relationship information (PUCCH-SpatialRelationInfo).

[0214] If the PUCCH spatial relationship information does not include a specific RS and includes information for power control of the PUCCH (e.g., pucch-PathlossReferenceRS-Id, p0-PUCCH-Id, closedLoopIndex), the UE can perform power control of the PUCCH based on the PUCCH spatial relationship information.

[0215] <<Case 4>> If a specific higher layer parameter is not configured, the UE may assume that the spatial relationship of a specific UL transmission is the same as the default spatial relationship (the RS of the spatial relationship of a specific UL transmission is the same as the RS of QCL type D in the TCI state of a specific DL transmission).

[0216] The specific higher layer parameter may be a specific RRC information element or a higher layer parameter of spatial relationship information (eg, spatialRelationInfo, PUCCH-SpatialRelationInfo).

[0217] The SRS parameters (higher layer parameters of spatial relationship information (spatialRelationInfo), which is the configuration of the spatial relationship between the reference RS and the target SRS) may be semi-statically configurable by higher layer parameters of the SRS resource (SRS-Resource).

[0218] The higher layer parameter spatialRelationInfo may include the ID of a reference RS, if it is configured. The reference RS may be an SS / PBCH block, a CSI-RS, or an SRS. The CSI-RS may be configured on a serving cell indicated by the higher layer parameter of the serving cell ID (servingCellId) if present. The SRS may be configured on a UL BWP indicated by the higher layer parameter of the UL BWP (uplinkBWP), on a serving cell indicated by the higher layer parameter of the serving cell ID (servingCellId) if present, or on the same serving cell as the target SRS otherwise.

[0219] If the higher layer parameter spatialRelationInfo is not configured, the UE may assume that the spatially related RS is identical to the RS of QCL type D in the active TCI state of the particular DL transmission.

[0220] If the higher layer parameter spatialRelationInfo is not set, the UE may assume that the spatially related RS is identical to the QCL type D RS in the active TCI state of the particular DL transmission, or the QCL type D RS in the TCI state or QCL assumption of the CORESET that has the lowest CORESET-ID in the latest slot and is associated with the monitored search space.

[0221] <<Case 5>> If the specific higher layer parameter for the specific type is not configured, the UE may assume that the spatial relationship of the specific UL transmission is the same as the default spatial relationship (the RS of the spatial relationship of the specific UL transmission is the same as the RS of QCL type D in the TCI state of the specific DL transmission). The specific type may be at least one of P-SRS, SP-SRS, and A-SRS, and may be specified by the higher layer parameter of the resource type (resourceType) in the SRS resource information.

[0222] << <p-srs>>> This section describes the case where, for a UE configured with one or more SRS resource settings, the SRS resource information (SRS-Resource) indicates P-SRS (the higher layer parameter (resourceType) of the resource type in the SRS resource information indicates “periodic”).

[0223] If the UE is configured with the upper layer parameter spatialRelationInfo including the ID of the reference SS / PBCH block (ssb-Index), the UE may transmit the target SRS resource with the same spatial domain transmit filter as that used to receive the reference SS / PBCH block. If the UE is configured with the upper layer parameter spatialRelationInfo including the ID of the reference CSI-RS (csi-RS-Index), the UE may transmit the target SRS resource with the same spatial domain transmit filter as that used to receive the reference periodic CSI-RS or the reference semi-persistent CSI-RS. If the UE is configured with the upper layer parameter spatialRelationInfo including the ID of the reference SRS (srs), the UE may transmit the target SRS resource with the same spatial domain transmit filter as that used to transmit the reference P-SRS.

[0224] If the higher layer parameter spatialRelationInfo is not configured, the UE may assume that the spatially related RS of a particular UL transmission is identical to the QCL type D RS in the active TCI state of a particular DL transmission.

[0225] If the higher layer parameter spatialRelationInfo is not set, the UE may assume that the spatially related RS of a particular UL transmission is identical to the RS of QCL type D in the TCI state or QCL assumption of the CORESET that has the lowest CORESET-ID in the latest slot and is associated with the monitored search space.

[0226] << <sp-srs>>> This section describes the case where, for a UE configured with one or more SRS resource settings, the SRS resource information (SRS-Resource) indicates SP-SRS (the higher layer parameter (resourceType) of the resource type in the SRS resource information indicates “semi-persistent”).

[0227] If the UE receives an activation command for an SRS resource, and if a HARQ-ACK corresponding to a PDSCH carrying a selection command is transmitted in slot n, the corresponding behavior and UE assumptions on SRS transmission corresponding to the configured SRS resource set may be applied from slot n+3N+1, where N is the number of slots in a subframe. The activation command may include spatial relationship assumptions provided by a list of references to reference signal IDs, one per element of the activated SRS resource set. Each ID in the list may refer to a reference SS / PBCH block, NZP CSI-RS resource, or SRS resource. The reference NZP CSI-RS resource may be the NZP CSI-RS resource configured on the serving cell indicated by the resource serving cell ID field in the activation command, if present, or the NZP CSI-RS resource configured on the same serving cell as the SRS resource set, if not. The reference SRS resource may be an SRS resource configured on the serving cell and UL BWP indicated by the resource serving cell ID and resource BWP ID in the activation command if they are present, or an SRS resource configured on the same serving cell and BWP as the SRS resource set otherwise.

[0228] If the UE is configured with the upper layer parameter spatialRelationInfo including an ID of a reference SS / PBCH block (ssb-Index), the UE may transmit a target SRS resource with the same spatial domain transmit filter as that used to receive the reference SS / PBCH block. If the UE is configured with the upper layer parameter spatialRelationInfo including an ID of a reference CSI-RS (csi-RS-Index), the UE may transmit a target SRS resource with the same spatial domain transmit filter as that used to receive the reference periodic CSI-RS or the reference semi-persistent CSI-RS. If the UE is configured with the upper layer parameter spatialRelationInfo including an ID of a reference SRS (srs), the UE may transmit the reference SP-SRS or a target SRS resource with the same spatial domain transmit filter as that used to transmit the reference SP-SRS.

[0229] If none of the higher layer parameters spatialRelationInfo are configured or none of the higher layer parameters spatialRelationInfo are activated, the UE may assume that the spatially related RS of a particular UL transmission is identical to the QCL type D RS in the active TCI state of a particular DL transmission.

[0230] If none of the higher layer parameters spatialRelationInfo are configured or none of the higher layer parameters spatialRelationInfo are activated, the UE may assume that the spatially related RS of a particular UL transmission is identical to the RS of QCL type D in the TCI state or QCL assumption of the CORESET that has the lowest CORESET-ID in the latest slot and is associated with the monitored search space.

[0231] << <a-srs>>> This section describes the case where, for a UE configured with one or more SRS resource settings, the SRS resource information (SRS-Resource) indicates A-SRS (the higher layer parameter (resourceType) of the resource type in the SRS resource information indicates “aperiodic”).

[0232] If the UE is configured with the upper layer parameter spatialRelationInfo including an ID of a reference SS / PBCH block (ssb-Index), the UE may transmit a target SRS resource with the same spatial domain transmit filter as that used to receive the reference SS / PBCH block. If the UE is configured with the upper layer parameter spatialRelationInfo including an ID of a reference CSI-RS (csi-RS-Index), the UE may transmit a target SRS resource with the same spatial domain transmit filter as that used to receive the reference periodic CSI-RS, the reference semi-persistent SP-CSI-RS, or the latest reference aperiodic CSI-RS. If the UE is configured with the upper layer parameter spatialRelationInfo including an ID of a reference SRS (srs), the UE may transmit a target SRS resource with the same spatial domain transmit filter as that used to transmit the reference P-SRS, the reference SP-SRS, or the reference A-SRS.

[0233] If the higher layer parameter spatialRelationInfo is not configured, the UE may assume that the spatially related RS of a particular UL transmission is identical to the QCL type D RS in the active TCI state of a particular DL transmission.

[0234] If the higher layer parameter spatialRelationInfo is not set, the UE may assume that the spatially related RS of a particular UL transmission is identical to the RS of QCL type D in the TCI state or QCL assumption of the CORESET that has the lowest CORESET-ID in the latest slot and is associated with the monitored search space.

[0235] If the higher layer parameter spatialRelationInfo is not configured, the UE may assume that the spatially related RS of a particular UL transmission is identical to the RS of QCL type D in the TCI state or QCL assumption of the PDCCH that triggers the A-SPS.

[0236] "effect" According to the above-described first embodiment, when the active TCI state of a specific DL transmission is updated by MAC CE or DCI, the spatial relationship of a specific UL transmission can be updated. Since the spatial relationship of a specific UL transmission can be quickly controlled without the need for RRC reconfiguration, the communication characteristics of the specific UL transmission can be improved. Furthermore, since the base station does not need to configure and activate spatial relationship information, the signaling overhead for spatial relationship and communication interruption can be avoided.

[0237] It is considered that the maximum number of total active spatial relationships, which are (non-periodic NZP CSI-RS) unique DL-RS, SRS with no spatial relationship configuration, and TCI state available for DCI triggering of non-periodic NZP CSI-RS, for indicating spatial domain transmission filters for PUCCH and SRS for PUSCH per CC and per BWP in the UE capability information is at least 1. Furthermore, it is considered that if the maximum number of active spatial relationships is 1, an additional one active spatial relationship for PUCCH is supported. According to the first embodiment, the total number of active spatial relationships can be kept at 1, and the UE can operate according to the UE capability information.

[0238] <Embodiment 2> The UE may determine power control parameters for a particular UL transmission based on an implicit or explicit configuration using the default spatial relationship of embodiment 1 for the particular UL transmission.

[0239] When the UE is configured with spatial relationship information including power control parameters for a specific UL transmission, the UE may use the power control parameters included in the spatial relationship information for the specific UL transmission. The power control parameters may include at least one of a P0 value (e.g., p0, p0-PUCCH-Id), an α value (e.g., Alpha), a DL RS for path loss measurement (e.g., pathlossReferenceRS, PUCCH-PathlossReferenceRS-Id), an SRS power control adjustment state (e.g., srs-PowerControlAdjustmentStates), and a closed loop index (e.g., closedLoopIndex).

[0240] <<Embodiment 2-1>> If the UE is configured, either implicitly or explicitly, to use the default spatial relationship for a particular UL transmission, the UE may use a predefined power control parameter for the particular UL transmission, which may be a predefined value defined in a specification or may be configured in the UE by higher layer signaling.

[0241] <<Embodiment 2-2>> If the UE is implicitly or explicitly configured to use the default spatial relationship for a particular UL transmission, the UE may use the power control parameters set by the MAC CE for that particular UL transmission.

[0242] A MAC CE updating (indicating, activating) the TCI state or QCL assumptions for a particular DL transmission may include the power control parameters. A MAC CE activating any of the list of TCI states set by higher layer signaling may include the power control parameters.

[0243] The case in which the UE is implicitly or explicitly configured to use the default spatial relationship for a particular UL transmission may be the case in which the UE is not configured with RS (reference signal) by spatial relationship information (e.g., case 3 in embodiment 1).

[0244] The UE may be instructed (activated) by the MAC CE to select one of the spatial relationship information items configured by the RRC signaling. If the UE does not configure the RS according to the spatial relationship information and configures the power control parameter according to the spatial relationship information, the UE may update the power control parameter according to the spatial relationship information designated by the MAC CE.

[0245] "effect" Between the propagation path from the UE to the destination TRP#1 of the UL beam#1 and the propagation path from the UE to the destination TRP of the UL beam#2, at least one of the distance and whether it is line of sight (LOS) or non-line of sight (NLOS) may differ. According to the above-mentioned embodiment 2, by updating the spatial relationship (UL beam) of a specific UL transmission and updating the power control parameters, it is possible to appropriately control the power of the UL transmission even if the spatial relationship information is not set.

[0246] <Embodiment 3> The UE may determine the DL RS for measuring the path loss based on the MAC CE.

[0247] The UE may determine the DL RS for path loss measurement based on the MAC CE when the UE is configured implicitly or explicitly to use the default spatial relationship of embodiment 1 for a specific UL transmission. The UE may determine the DL RS for path loss measurement based on the MAC CE when the UE is configured with spatial relationship information for a specific UL transmission by higher layer signaling.

[0248] If the DL RS for path loss measurement (e.g., PUSCH-PathlossReferenceRS) is not explicitly configured by RRC layer signaling (if the UE is not provided with information of the DL RS for path loss measurement or before the UE is provided with individual higher layer parameters), the UE may determine the DL RS for path loss measurement based on the MAC CE.

[0249] The UE may be configured with a list including multiple DL RSs for path loss measurement (e.g., PUSCH-PathlossReferenceRS) by RRC signaling, and the DL RSs for path loss measurement in the list may be instructed (activated) by the MAC CE. For example, the UE may be configured with a list including 64 DL RSs for path loss measurement, and the UE may be instructed by the MAC CE to activate indexes of some DL RSs for path loss measurement in the list.

[0250] Information indicating association between the multiple DL RSs for path loss measurement and the multiple TCI states may be provided to the UE by higher layer signaling or may be specified in a specification. When the TCI state is updated, the UE may update the DL RS for path loss measurement by determining a DL RS for path loss measurement corresponding to the TCI state.

[0251] <<Embodiment 3-1>> When the spatial relationship information of a specific UL transmission is updated by the MAC CE, the UE may update the DL RS for path loss measurement.

[0252] When the spatial relationship information of a specific UL transmission is updated by the MAC CE, the UE may use the RS of the spatial relationship information of the specific UL transmission as the DL RS for path loss measurement. For example, when the spatial relationship information is updated from SSB#m to SSB#n by the MAC CE, the UE may update the DL RS for path loss measurement to SSB#n.

[0253] If at least one RS of QCL type D and QCL type A in the TCI state of a specific DL transmission is updated by the MAC CE, the UE may use the RS as a DL RS for path loss measurement.

[0254] <<Embodiment 3-2>> If the UE is implicitly or explicitly configured to use the default spatial relationship for a particular UL transmission, the UE may use the RS with the default spatial relationship as the DL RS for path loss measurement.

[0255] For example, if the UE is implicitly or explicitly configured to use a default spatial relationship for a particular UL transmission, and the QCL assumption of the PDCCH or PDSCH used for the default spatial relationship is updated to TRS#n by the MAC CE, the UE may update the DL RS for path loss measurement to TRS#n.

[0256] "effect" When the default spatial relationship is in the TCI state or QCL assumption, the DL RS for the spatial relationship of the specific UL transmission may be different from the DL RS for path loss measurement for power control of the specific UL transmission. According to the above-mentioned third embodiment, the DL RS for path loss measurement for power control of the specific UL transmission is updated by the MAC CE, so that the power control of the specific UL transmission can be appropriately performed.

[0257] (Wireless communication systems) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0258] 4 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0259] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0260] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN) and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN and the LTE (E-UTRA) base station (eNB) is the SN.

[0261] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0262] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0263] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0264] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0265] 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).

[0266] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0267] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0268] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0269] In the wireless communication system 1, a wireless access scheme 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.

[0270] The radio access scheme may be called a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0271] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as a downlink channel.

[0272] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0273] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0274] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0275] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0276] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0277] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0278] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0279] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0280] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0281] 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 the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0282] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0283] (base station) 5 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.

[0284] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0285] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0286] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0287] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0288] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0289] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0290] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0291] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0292] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0293] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0294] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0295] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0296] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0297] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0298] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0299] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0300] In addition, the transceiver 120 may transmit a reference signal (e.g., SSB, CSI-RS, etc.). The transceiver 120 may transmit information (MAC CE or DCI) indicating a TCI state for a specific DL transmission. The TCI state may indicate at least one of a reference signal (e.g., SSB, CSI-RS, etc.), a QCL type, and a cell transmitting the reference signal. The TCI state may indicate one or more reference signals. The one or more reference signals may include a reference signal of QCL type A or a reference signal of QCL type D.

[0301] The control unit 110 may assume that a spatially related first reference signal of a specific uplink transmission (e.g., SRS, PUCCH, PUSCH, etc.) is a second reference signal (e.g., SSB, CSI-RS) of a transmission control indication (TCI) state of a specific downlink channel (e.g., PDCCH, PDSCH, etc.) or a QCL type D in a quasi-co-location (QCL) assumption.

[0302] (User terminal) 6 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0303] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0304] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0305] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0306] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0307] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0308] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0309] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0310] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0311] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0312] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0313] Whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0314] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0315] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0316] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0317] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0318] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0319] In addition, the transceiver 220 may receive a reference signal (for example, SSB, CSI-RS, etc.).

[0320] The control unit 210 may determine, based on an implicit or explicit setting, one of a first reference signal (e.g., TCI state, QCL assumption) related to quasi-co-location (QCL) and a second reference signal (e.g., DL RS for path loss measurement) used to measure path loss for power control of a certain uplink transmission (specific UL transmission), as the spatial relationship of the uplink transmission, and may determine a parameter (e.g., power control parameter) related to power control of the uplink transmission. The transceiver unit 220 may perform the uplink transmission according to the spatial relationship.

[0321] The control unit 210 may determine the parameter based on a predetermined value or higher layer signaling (second embodiment).

[0322] The control unit 210 may determine the second reference signal as a reference signal for the spatial relationship ("TCI state, QCL assumption, or RS used as default spatial relationship" in the first embodiment).

[0323] When the control unit 210 is instructed to provide a reference signal of the spatial relationship (for example, spatial relationship information), the control unit 210 may determine the reference signal of the spatial relationship as the second reference signal (embodiment 3-1).

[0324] The control unit 210 may determine the first reference signal as the second reference signal based on the setting (embodiment 3-2).

[0325] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0326] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0327] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 7 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0328] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0329] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0330] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0331] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0332] Moreover, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0333] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0334] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0335] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0336] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0337] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0338] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0339] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0340] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0341] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0342] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0343] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0344] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0345] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the 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. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0346] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0347] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0348] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0349] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0350] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0351] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0352] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0353] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0354] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0355] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0356] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0357] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0358] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0359] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0360] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0361] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0362] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0363] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0364] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0365] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0366] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0367] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0368] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0369] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0370] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0371] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," and the like may be used interchangeably.

[0372] In this disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0373] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0374] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0375] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0376] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0377] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0378] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0379] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0380] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0381] Each aspect / embodiment described in the present disclosure may be applied to a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 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), or other suitable wireless communication method, or a next-generation system extended based on these. In addition, multiple systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

[0382] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0383] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0384] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0385] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0386] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0387] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0388] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0389] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0390] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0391] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0392] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0393] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

[0394] This application is based on Japanese Patent Application No. 2019-091721, filed on May 14, 2019, the contents of which are incorporated herein in their entirety.

Claims

1. A receiver that receives either a medium access control-control element (MAC CE) indicating one ID of a plurality of path loss measurement reference signals for uplink transmission, or a MAC CE indicating one ID of a plurality of transmission configuration indication (TCI) states for downlink reception; a control unit that performs a path loss measurement for the uplink transmission by using a downlink reference signal corresponding to the ID indicated by the MAC CE received by the receiving unit, A terminal in which, when an upper layer parameter is set indicating the use of a default beam for the uplink transmission and spatial relationship information available for the uplink transmission is not set, the downlink reference signal is a reference signal within the TCI state of a specific control resource set.

2. The terminal of claim 1 , wherein the downlink reference signal is one of a plurality of downlink reference signals configured by a radio resource control (RRC) information element.

3. The terminal of claim 1 , wherein the specific control resource set is a control resource set having a lowest control resource set ID.

4. receiving one of a medium access control-control element (MAC CE) indicating an ID of one of a plurality of path loss measurement reference signals for uplink transmission and a MAC CE indicating an ID of one of a plurality of transmission configuration indication (TCI) states for downlink reception; performing a path loss measurement for the uplink transmission by using a downlink reference signal corresponding to the ID indicated by the MAC CE received in the receiving step; A wireless communication method for a terminal, in which, when an upper layer parameter indicating the use of a default beam for the uplink transmission is set and spatial relationship information available for the uplink transmission is not set, the downlink reference signal is a reference signal within a TCI state of a specific control resource set.

5. A transmitter that transmits either a medium access control-control element (MAC CE) indicating one ID of a plurality of path loss measurement reference signals for uplink transmission, or a MAC CE indicating one ID of a plurality of transmission configuration indication (TCI) states for downlink reception; A control unit that controls reception of the uplink transmission, The power of the uplink transmission is based on a path loss measurement for using a downlink reference signal corresponding to the ID indicated by the MAC CE transmitted by the transmitter unit, A base station, in which, when an upper layer parameter is set indicating the use of a default beam for the uplink transmission and spatial relationship information available for the uplink transmission is not set, the downlink reference signal is a reference signal within the TCI state of a specific control resource set.

6. A system having a terminal and a base station, The terminal includes: A receiver that receives either a medium access control-control element (MAC CE) indicating one ID of a plurality of path loss measurement reference signals for uplink transmission, or a MAC CE indicating one ID of a plurality of transmission configuration indication (TCI) states for downlink reception; a control unit that performs a path loss measurement for the uplink transmission by using a downlink reference signal corresponding to the ID indicated by the MAC CE received by the receiving unit, When a higher layer parameter indicating the use of a default beam for the uplink transmission is configured and spatial relationship information available for the uplink transmission is not configured, the downlink reference signal is a reference signal in a TCI state of a specific control resource set; The base station transmits the MAC CE.

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