Terminal, wireless communication method, base station and system

Abstract

To provide a terminal, a wireless communication method, a base station, and a system capable of appropriately transmitting UL signals.SOLUTION: In a next-generation mobile communication system, a terminal includes a receiving unit that receives a first medium access control-control element (MAC CE) that activates a first TCI state, which is a transmission configuration indication (TCI) state of a path loss reference signal (PL-RS), and a second MAC CE that indicates a second TCI state, which is a TCI state of a control resource set (CORESET), and a control unit that, when the first TCI state is known, switches to the PL-RS at a first timing that is 3 ms after transmitting an acknowledgement (ACK) to the first MAC CE, and when the first TCI state is unknown, switches to the PL-RS at a second timing that is a predetermined period after transmitting the ACK to the first MAC CE.SELECTED DRAWING: Figure 8

Description

[Technical Field]

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

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was specified with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of achieving higher capacity and more advanced features than 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), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later) are also being considered.

[0004] In existing LTE systems (e.g., 3GPP Rel. 8-14), a user equipment (UE) transmits uplink control information (UCI) using at least one of an UL data channel (e.g., a Physical Uplink Shared Channel (PUSCH)) and an UL control channel (e.g., a Physical Uplink Control Channel (PUCCH)). [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 that user terminals (UEs) will control transmission and reception processes based on information about quasi-co-location (QCL).

[0007] However, it is unclear how to switch at least one of the spatial relationship and the path loss reference signal of the uplink signal based on the updated information on the QCL of the downlink signal. If the UE does not appropriately switch at least one of the spatial relationship and the path loss reference signal, the UL signal cannot be appropriately transmitted, which may result in degradation of system performance, such as a decrease in throughput.

[0008] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, a base station, and a system that appropriately transmit UL signals. [Means for solving the problem]

[0009] A terminal according to one aspect of the present disclosure includes a receiver that receives a first medium access control-control element (MAC CE) that activates a first TCI state that is a transmission configuration indication (TCI) state of a path loss reference signal (PL-RS) and a second MAC CE that indicates a second TCI state that is a TCI state of a control resource set (CORESET); and, if the first TCI state is known, switches to the PL-RS at a first timing after 3 ms have elapsed since an acknowledgment (ACK) transmission for the first MAC CE, and, if the first TCI state is unknown, switches to the PL-RS at a second timing after a predetermined period has elapsed since an ACK transmission for the first MAC CE, wherein the predetermined period is a sum of 3 ms and a time for measuring Layer 1-reference signal received power (L1-RSRP), and when an upper layer parameter indicating enablement information of default beam path loss of a measurement reference signal (SRS) is configured and when spatial relationship information and the PL-RS are not configured for the SRS, switches to the second MAC CE that indicates the second TCI state. and a control unit that uses the second TCI state for the spatial relationship of the SRS at a third timing after 3 ms has elapsed since the transmission of an ACK to the CE. [Effects of the Invention]

[0010] According to one aspect of the present disclosure, UL signals can be transmitted appropriately. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of measurement delay requirements for intra-frequency measurements. [Figure 2] 2A and 2B are diagrams showing an example of a scaling factor that takes into account the number of samples in L1-RSRP measurement and UE reception beam switching. [Figure 3] 3A and 3B are diagrams illustrating an example of an L1-RSRP measurement period based on SSB. [Figure 4] 4A and 4B are diagrams illustrating an example of an L1-RSRP measurement period based on CSI-RS. [Figure 5]FIG. 5 is a diagram showing an example of updating the spatial relationship in Rel. 15. [Figure 6] FIG. 6 is a diagram showing an example of updating the PL-RS in Rel.16. [Figure 7] FIG. 7 is a diagram illustrating an example of a timeline of switching at least one of the default spatial relationship and the default PL-RS. [Figure 8] FIG. 8 is a diagram illustrating an example of a timeline for switching the default PL-RS according to the seventh embodiment. [Figure 9] FIG. 9 is a diagram illustrating another example of a timeline for switching the default PL-RS according to the seventh embodiment. [Figure 10] FIG. 10 is a diagram illustrating yet another example of a timeline for switching the default PL-RS according to the seventh embodiment. [Figure 11] FIG. 11 is a diagram illustrating an example of a timeline of switching of the PL-RS according to the eighth embodiment. [Figure 12] FIG. 12 is a diagram illustrating another example of a timeline of switching of the PL-RS according to the eighth embodiment. [Figure 13] FIG. 13 is a diagram illustrating yet another example of a timeline of switching of the PL-RS according to the eighth embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 15] FIG. 15 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 16] FIG. 16 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 17] FIG. 17 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 INVENTION

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

[0013] The TCI state may represent that which is applied to a downlink signal / channel, and the equivalent of the TCI state which 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, etc. The TCI state may be configured in the UE for each channel or signal.

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

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

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

[0018] The assumption by a UE that a Control Resource Set (CORESET), channel, or reference signal has a specific 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 assumption of the signal / channel.

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

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

[0022] The MAC signaling may use, 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 or spatial relationship 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] Furthermore, the RS that has a QCL relationship with the channel may be, for example, at least one of a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), a CSI-RS for tracking (also called a Tracking Reference Signal (TRS)), and a QCL detection reference signal (also called a QRS).

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

[0027] The UE may receive configuration information including a list of TCI state information elements (eg, PDSCH-Config, tci-StatesToAddModList) through higher layer signaling.

[0028] A TCI state information element ("TCI-state IE" in RRC) configured by higher layer signaling may include a TCI state ID and one or more pieces of QCL information ("QCL-Info"). The QCL information may include at least one of information about an RS having a QCL relationship (RS relationship information) and information indicating a QCL type (QCL type information). The RS relationship information may include information such as an index of the RS (e.g., an SSB index, a Non-Zero-Power (NZP) CSI-RS resource identifier), an index of a cell in which the RS is located, and an index of a Bandwidth Part (BWP) in which the RS is located.

[0029] In Rel.15 NR, as at least one TCI state of PDCCH and PDSCH, both RSs of QCL type A and RS of QCL type D, or only the RS of QCL type A can be set for the UE.

[0030] When the TRS is set as the RS of QCL type A, unlike the demodulation reference signal (DeModulation Reference Signal (DMRS)) of PDCCH or PDSCH, it is assumed that the same TRS is transmitted periodically over a long time. The UE can measure the TRS and calculate the average delay, delay spread, etc.

[0031] For the UE in which the TRS is set as the RS of QCL type A in the TCI state of the DMRS of PDCCH or PDSCH, since it can be assumed that the QCL type A parameters (average delay, delay spread, etc.) of the DMRS of PDCCH or PDSCH and the TRS are the same, the type A parameters (average delay, delay spread, etc.) of the DMRS of PDCCH or PDSCH can be obtained from the measurement result of the TRS. When performing at least one channel estimation of PDCCH and PDSCH, the UE can use the measurement result of the TRS to perform a more accurate channel estimation.

[0032] The UE for which the RS of QCL type D is set can determine the UE reception beam (spatial domain reception filter, UE spatial domain reception filter) using the RS of QCL type D.

[0033] The RS of QCL type X in the TCI state may mean the RS that is in the relationship of QCL type X with a certain channel / signal (DMRS), and this RS may also be called the QCL source of QCL type X in this TCI state.

[0034] <TCI state for PDCCH> The information regarding QCL between the PDCCH (or the DMRS antenna port related to the PDCCH) and a certain RS may be referred to as, for example, the TCI state for the PDCCH.

[0035] 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 for the UE by RRC signaling.

[0036] For each CORESET, the UE may activate one of the multiple TCI states set by RRC signaling by means of a MAC CE. This 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.

[0037] <TCI state for PDSCH> The information regarding QCL between the PDSCH (or the DMRS antenna port related to the PDSCH) and a certain DL-RS may be referred to as, for example, the TCI state for the PDSCH.

[0038] The UE may be notified (set) by upper layer signaling of M (M≥1) TCI states for the PDSCH (M 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.

[0039] The DCI used for scheduling the PDSCH may include a field indicating the TCI status for the PDSCH (e.g., may be referred to as a TCI field, a TCI status field, etc.). The DCI may be used for scheduling the PDSCH of one cell and may be referred to as, for example, DL DCI, DL assignment, DCI format 1_0, DCI format 1_1, etc.

[0040] Whether the TCI field is included in the DCI may be controlled by information transmitted from the base station to the UE. The information may be information indicating whether the TCI field is present or absent in the DCI (e.g., TCI presence information, TCI presence information in DCI, or higher layer parameter TCI-PresentInDCI). The information may be configured in the UE by, for example, higher layer signaling.

[0041] 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.

[0042] If the UE is configured with the 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.

[0043] When TCI presence information is not set for a CORESET that schedules a PDSCH or when the PDSCH is scheduled using DCI format 1_0, if the time offset between the reception of DL DCI (the DCI that schedules the PDSCH) and the 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 the same as the TCI state or QCL assumption applied to the CORESET used for the PDCCH transmission that schedules the PDSCH, in order to determine the QCL of the PDSCH antenna port.

[0044] 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 if 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 bearing 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 greater than or equal to a threshold, the UE may assume that the DM-RS port of the PDSCH of the serving cell is in the TCI state for the QCL type parameter given by the indicated TCI state.

[0045] 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 consistent across slots with scheduled PDSCHs. 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 "enabled" and at least one of the TCI states configured for a serving cell scheduled by the search space set includes QCL type D.

[0046] In the RRC connected mode, when the TCI information in DCI (the upper layer parameter TCI-PresentInDCI) is set to "enabled" or when the TCI information in DCI is not set, if the time offset between the reception of a DL DCI (a DCI that schedules a PDSCH) and the corresponding PDSCH (a PDSCH scheduled by the DCI) is less than a threshold, the UE may assume that the DM-RS port of the PDSCH of the serving cell 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, 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. This RS may be referred to as the default TCI state of the PDSCH or the default QCL assumption of the PDSCH.

[0047] The time offset between the reception of a DL DCI and the reception of the PDSCH corresponding to that DCI may be referred to as a scheduling offset.

[0048] In addition, the above threshold may also be called time duration for QCL, "timeDurationForQCL", "Threshold", "Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset", schedule offset threshold, scheduling offset threshold, etc.

[0049] The QCL time length may be based on UE capabilities, for example, the delay required for decoding the PDCCH and beam switching. The QCL time length may be the minimum time required for the UE to receive the PDCCH and apply the spatial QCL information received in the DCI for PDSCH processing. The QCL time length may be expressed in terms of the number of symbols per subcarrier spacing or in terms of time (e.g., μs). Information about the QCL time length may be reported from the UE to the base station as UE capability information, or may be configured in the UE by the base station using higher layer signaling.

[0050] For example, the UE may assume that the DMRS port of the PDSCH is the DL-RS and QCL based on the activated TCI state for the CORESET corresponding to the smallest CORESET-ID. The latest slot may be, for example, the slot in which the DCI scheduling the PDSCH is received.

[0051] Note that the CORESET-ID may be an ID (controlResourceSetId, an ID for identifying the CORESET) set by the RRC information element "ControlResourceSet."

[0052] If no CORESET is configured for a CC, the default TCI state may be the activated TCI state that is applicable to the PDSCH within the active DL BWP of the CC and has the lowest ID.

[0053] In releases after Rel.16, in the case where the PDSCH and the PDCCH that schedules it are in different component carriers (CCs) (cross-carrier scheduling), if the delay from the PDCCH to the PDSCH (PDCCH-to-PDSCH delay) is shorter than the QCL time duration, or if the TCI state is not present in the DCI for the scheduling, the UE may obtain the QCL assumption for the scheduled PDSCH from the active TCI state that is applicable to the PDSCH within the active BWP of the scheduled cell and has the lowest ID.

[0054] <Spatial relation for PUCCH> The UE may be configured with parameters (PUCCH configuration information, PUCCH-Config) used for PUCCH transmission by upper layer signaling (e.g., Radio Resource Control (RRC) signaling). The PUCCH configuration information may be configured for each partial band (e.g., uplink bandwidth part (Bandwidth Part (BWP))) within a carrier (also referred to as a cell or a component carrier (Component Carrier (CC))).

[0055] The PUCCH configuration information may include a list of PUCCH resource set information (e.g., PUCCH-ResourceSet) and a list of PUCCH spatial relation information (e.g., PUCCH-SpatialRelationInfo).

[0056] The PUCCH resource set information may include a list (e.g., resourceList) of PUCCH resource indices (IDs, e.g., PUCCH-ResourceId).

[0057] Furthermore, if 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 Type 1 (SIB1) or Remaining Minimum System Information (RMSI)). The PUCCH resource set may include 16 PUCCH resources.

[0058] 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 the PUCCH resource set according to the number of UCI information bits.

[0059] The UE determines the value of a field (e.g., a PUCCH resource indicator field) in Downlink Control Information (DCI) (e.g., DCI format 1_0 or 1_1 used for scheduling a PDSCH) and the number of CCEs (N) in a control resource set (CONTROLLER RESOLUTION SET (CORESET)) for receiving a PDCCH carrying the DCI. CCE ) and the index (n CCE,0 ) and may determine one PUCCH resource (index) in the PUCCH resource set (for example, a PUCCH resource set that is cell-specific or determined individually for the UE) based on at least one of the above.

[0060] 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.

[0061] 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, for example, pucch-SpatialRelationInfoId) of the PUCCH spatial relationship information, an index (ID, for example, servingCellId) of the serving cell, and information on an RS (reference RS) that has a spatial relationship with the PUCCH.

[0062] For example, the information about the RS may be an SSB index, a CSI-RS index (e.g., an 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 measuring the corresponding RS.

[0063] If more than one spatial relationship information for PUCCH is configured, the UE may control the activation of one PUCCH spatial relationship information for one PUCCH resource at a certain time based on the PUCCH spatial relation Activation / Deactivation MAC CE.

[0064] The PUCCH spatial-related activation / deactivation MAC CE in Rel-15 NR is represented by a total of three octets (8 bits x 3 = 24 bits), octets (Octet, Oct) 1-3.

[0065] The MAC CE may include information such as the serving cell ID to be applied (“Serving Cell ID” field), BWP ID (“BWP ID” field), PUCCH resource ID (“PUCCH Resource ID” field), etc.

[0066] In addition, the MAC CE includes fields of “S i ” (i = 0 - 7). When the field of a certain S i indicates 1, the UE activates the spatial relationship information of spatial relationship information ID#i. When the field of a certain S i indicates 0, the UE deactivates the spatial relationship information of spatial relationship information ID#i.

[0067] The UE may activate the PUCCH relationship information specified by the MAC CE 3 ms after transmitting an acknowledgement (ACK) for the MAC CE that activates the PUCCH spatial relationship information.

[0068] <Spatial relationship for SRS and PUSCH> The UE may receive information used for transmitting a measurement reference signal (e.g., a sounding reference signal (SRS)), such as SRS configuration information (e.g., parameters within “SRS-Config” of an RRC control element).

[0069] Specifically, the UE may receive at least one of information regarding one or more SRS resource sets (SRS resource set information, e.g., “SRS-ResourceSet” of an RRC control element) and information regarding one or more SRS resources (SRS resource information, e.g., “SRS-Resource” of an RRC control element).

[0070] An SRS resource set may be associated with (or group together) several SRS resources, each of which may be identified by an SRS Resource Indicator (SRI) or SRS Resource Identifier.

[0071] 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, and information on SRS usage.

[0072] Here, the SRS resource type may indicate any one of periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic SRS (A-SRS, AP-SRS). Note that the UE may transmit P-SRS and SP-SRS periodically (or periodically after activation) and transmit A-SRS based on an SRS request in the DCI.

[0073] Furthermore, the use ("usage" of the RRC parameter, "SRS-SetUse" of the L1 (Layer-1) parameter) may be, for example, beam management, codebook-based transmission (codebook: CB), non-codebook-based transmission (non-Codebook: NCB), antenna switching, etc. The SRS for the use of codebook-based transmission or non-codebook-based transmission may be used to determine a precoder for codebook-based or non-codebook-based PUSCH transmission based on the SRI.

[0074] 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.

[0075] 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, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), hopping-related information, an SRS resource type, a sequence ID, spatial relationship information of the SRS, etc.

[0076] The spatial relationship information of the SRS (e.g., the RRC information element "spatialRelationInfo") may indicate spatial relationship information between a certain reference signal and the SRS. The 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).

[0077] 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 reference signal.

[0078] In the present disclosure, the SSB index, SSB resource ID, and SSBRI (SSB Resource Indicator) may be interchangeable. Also, the CSI-RS index, CSI-RS resource ID, and CRI (CSI-RS Resource Indicator) may be interchangeable. Also, the SRS index, SRS resource ID, and SRI may be interchangeable.

[0079] The spatial relationship information of the SRS may include a serving cell index, a BWP index (BWP ID), etc. corresponding to the reference signal.

[0080] In NR, transmission of uplink signals 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 the beam to be used for transmitting a signal (transmit beam, Tx beam) based on the beam to be used for receiving the signal (receive beam, Rx beam).

[0081] 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.

[0082] For example, without 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).

[0083] On the other hand, when BC is present, the UE may transmit uplink signals (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 SSB or CSI-RS (or CSI-RS resources).

[0084] 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.

[0085] When the UE is configured with spatial relationship information between another SRS (reference SRS) and the SRS (target SRS) for a resource of 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. In other words, 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.

[0086] The UE may determine the spatial relationship of the PUSCH scheduled by the DCI (e.g., DCI format 0_1) based on the value of a 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 field (e.g., the SRI) for PUSCH transmission.

[0087] When codebook-based transmission is used 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 (a 1-bit field). When non-codebook-based transmission is used for PUSCH, four SRS resources may be configured for the UE by RRC and one of the four SRS resources may be indicated by DCI (a 2-bit field). To use a spatial relationship other than the two or four spatial relationships configured by RRC, an RRC reconfiguration is required.

[0088] In addition, the DL-RS can be configured for the spatial relationship of the SRS resources used for the PUSCH. For example, for SP-SRS, the UE can be configured by RRC with the spatial relationship of multiple (e.g., up to 16) SRS resources, and one of the multiple SRS resources can be indicated by the MAC CE.

[0089] (Path loss RS) Path loss PL in the transmission power control of PUSCH, PUCCH, and SRS b,f,c (q d ) [dB] is the index q of the reference signal (RS, Pathloss Reference RS) for the downlink BWP associated with the active UL BWP b of carrier f of serving cell c. d In this disclosure, the path loss reference RS, pathloss(PL)-RS, and index q d , RS used for path loss calculation, and RS resource used for path loss calculation may be interchangeable. In the present disclosure, calculation, estimation, measurement, and track may be interchangeable.

[0090] It is being considered whether to modify the existing mechanism of higher layer filtered RSRP for path loss measurement when the path loss RS is updated by the MAC CE.

[0091] When the pathloss RS is updated by the MAC CE, pathloss measurement based on L1-RSRP may be applied. At an available timing after the MAC CE for updating the pathloss RS, the upper layer filtered RSRP may be used for pathloss measurement, and before the upper layer filtered RSRP is applied, the L1-RSRP may be used for pathloss measurement. At an available timing after the MAC CE for updating the pathloss RS, the upper layer filtered RSRP may be used for pathloss measurement, and before that timing, the upper layer filtered RSRP of the previous pathloss RS may be used. Similar to the operation in Rel. 15, the upper layer filtered RSRP is used for pathloss measurement, and the UE may track all pathloss RS candidates configured by the RRC. The maximum number of pathloss RSs configurable by the RRC may depend on the UE capability. If the maximum number of pathloss RSs configurable by the RRC is X, X or fewer pathloss RS candidates may be configured by the RRC, and the MAC CE may select a pathloss RS from the configured pathloss RS candidates. The maximum number of pathloss RSs configurable by the RRC may be 4, 8, 16, 64, etc.

[0092] In the present disclosure, upper layer filtered RSRP, filtered RSRP, and layer 3 filtered RSRP may be read interchangeably.

[0093] (Measurement delay requirements) For radio resource management (RRM) measurements for Layer 3 (L3) mobility, measurement latency requirements for intra-frequency measurements are specified. As shown in Figure 1, measurement latency requirements are specified for cell discovery, RSRP measurement, and SSB index discovery.

[0094] where M pss / sss_sync_w / o_gapsis 40 for a UE supporting FR2 power class 1, 24 for a UE supporting power class 2, 24 for a UE supporting FR2 power class 3, and 24 for a UE supporting FR2 power class 4. meas_period_w / o_gaps is 40 for a UE supporting power class 1, 24 for a UE supporting FR2 power class 2, 24 for a UE supporting power class 3, and 24 for a UE supporting power class 4. If the intra-frequency SSB measurement timing configuration (SMTC) does not completely overlap with the measurement gap (MG), or if the intra-frequency SMTC completely overlaps with the MG, K p = 1. If the intra-frequency SMTC partially overlaps with the MG, the measurement gap repetition period (MGRP) is used to p = 1 / (1-(SMTC period / MGRP)), and SMTC period <MGRPである。K RLM (K layer1_measurement ) is 1 or 1.5 depending on the relationship between all reference signals configured for radio link monitoring (RLM), beam failure detection (BFD), candidate beam detection (CBD), or L1-RSRP for beam reporting outside of MG and intra-frequency SMTC occasions. intra is the carrier-specific scaling factor.

[0095] If DRX is enabled and the DRX cycle is less than 320 ms, the ceil function is multiplied by 1.5 to account for misalignment between the DRX on duration and the SMTC window.

[0096] In LTE, CRS allows constant measurement, so the measurement latency requirement is a fixed value of 800 ms (600 ms for cell detection and synchronization + 200 ms for RSRP measurement). In NR, the lower limits are specified as 600 ms for LTE cell detection and 200 ms for LTE RSRP measurement to avoid unnecessarily frequent measurements from the perspective of UE power consumption recommendations. In NR, the SMTC period can be configured, so the measurement latency requirement according to the SMTC period is applied.

[0097] (L1-RSRP measurement / report) The UE measures the value of Layer 1 (L1)-RSRP for each RS (each base station transmission beam) configured by the RRC.

[0098] For each L1-RSRP report, a measurement period is specified, indicating the number of samples within which L1-RSRP measurement must be completed. If the number of samples used in RSRP measurement for one L1-RSRP report is M, the scaling factor taking into account overlap with SMTC or measurement gap (MG) is P, the scaling factor taking into account UE receiving beam switching is N, and the transmission period of SSB or CSI-RS is RS transmission period, then the measurement period T in FR1 is expressed as M × P × RS transmission period, and the measurement period T in FR2 is expressed as M × N × P × RS transmission period.

[0099] Here, as shown in Figure 2A, if a time-domain measurement restriction for channel (signal) measurement (timeRestrictionForChannelMeasurements) is set or if the RS for L1-RSRP measurement is an aperiodic CSI-RS, M = 1; otherwise, M = 3. As shown in Figure 2B, if the L1-RSRP report is based on the CSI-RS, N = 1; if the L1-RSRP report is based on SSB, N = 8; and if the L1-RSRP report is based on CSI-RS with repetition and the number of CSI-RS resources is smaller than the maximum number of receive beams (maxNumberRxBeam), N = ceil(maxNumberRxBeam / number of CSI-RS resources).

[0100] The measurement accuracy of L1-RSRP based on one sample measurement is specified. Whether RSRP is averaging in L1 may depend on the UE implementation. If time domain measurement limitations for channel measurements are configured, the UE reports one sample of RSRP without averaging as the L1-RSRP measurement result.

[0101] Figure 3A shows the SSB-based L1-RSRP measurement period T L1-RSRP_Measurement_Period_SSB FIG. 3B shows the L1-RSRP measurement period T L1-RSRP_Measurement_Period_SSB where T SSB = ssb-periodicityServingCell is the periodicity of the SSB index configured for L1-RSRP measurements. DRX is the DRX cycle length. Report is the period set for reporting.

[0102] FIG. 4A shows the L1-RSRP measurement period T L1-RSRP_Measurement_Period_CSI-RS FIG. 4B shows the L1-RSRP measurement period T L1-RSRP_Measurement_Period_CSI-RS Indicates T CSI-RSis the period of the CSI-RS configured for L1-RSRP measurement. This requirement is applicable to the case where the CSI-RS configured for L1-RSRP measurement is transmitted with Density=3.

[0103] (Default spatial relations and default PL-RS) In Rel.15, separate MAC CEs are required for the activation / deactivation of PUCCH spatial relations and for the activation / deactivation of SRS spatial relations. The PUSCH spatial relations follow the SRS spatial relations.

[0104] In Rel. 16, at least one of the MAC CE for PUCCH spatial-related activation / deactivation and the MAC CE for SRS spatial-related activation / deactivation may not be used.

[0105] If neither the spatial relationship nor the PL-RS for the PUCCH is configured in FR2, the default assumptions of the spatial relationship and the PL-RS for the PUCCH (default spatial relationship and default PL-RS) are applied. If neither the spatial relationship nor the PL-RS for the SRS is configured in FR2, the default assumptions of the spatial relationship and the PL-RS for the PUSCH and the SRS scheduled by DCI format 0_1 ​​(default spatial relationship and default PL-RS) are applied.

[0106] If a CORESET is configured in an active DL BWP on a CC, the default spatial relationship and default PL-RS may be the TCI state or QCL assumption of the CORESET with the lowest CORESET ID in the active DL BWP. If a CORESET is not configured in an active DL BWP on a CC, the default spatial relationship and default PL-RS may be the active TCI state with the lowest PDSCH ID in the active DL BWP.

[0107] In Rel.15, the spatial relationship of PUSCH scheduled by DCI format 0_0 follows the spatial relationship of the PUCCH resource with the lowest PUCCH resource ID among the active spatial relationships of PUCCH on the same CC. The network needs to update the PUCCH spatial relationships on all SCells even if no PUCCH is transmitted on the SCell.

[0108] In Rel. 16, no PUCCH configuration is required for a PUSCH scheduled by DCI format 0_0. The default spatial relationship and default PL-RS are applied to a PUSCH scheduled by DCI format 0_0.

[0109] For accurate path loss measurement for transmit power control, a Rel.15 UE is configured with up to four PL-RSs via RRC signaling. As shown in Figure 5, the PL-RSs cannot be updated by the MAC CE even if the UL transmit beam (spatial relationship) is updated by the MAC CE.

[0110] A Rel. 16 UE can be configured with up to 64 PL-RSs via RRC signaling and one PL-RS activated by the MAC CE, as shown in Figure 6. The UE is required to track up to four active PL-RSs for all UL channels (SRS, PUCCH, and PUSCH). Tracking the PL-RSs may involve calculating path loss based on measurements of the PL-RSs and storing the path loss.

[0111] For path loss calculation, an upper layer filter RSRP (average of multiple RSRP measurements) is used. As shown in Figure 6, when PL-RS is updated by MAC CE (when a PL-RS#1 different from the PL-RS (previous PL-RS) used for path loss calculation in the PL-RS list configured by RRC is indicated by MAC CE), the first RSRP measurement instance 3 ms after the transmission of ACK to the MAC CE is set as the first RSRP measurement sample, and PL-RS#1 may be applied (may be used for path loss calculation) at the slot boundary after the fifth RSRP measurement sample.

[0112] In the present disclosure, RSRP measurement, RSRP measurement sample, RSRP measurement resource, RSRP measurement timing, RSRP measurement instance, PL-RS measurement sample, PL-RS measurement resource, PL-RS measurement, PL-RS measurement timing, and PL-RS measurement instance may be read interchangeably.

[0113] When the TCI state for PDCCH or PDSCH is updated by the MAC CE, the PL-RS is also updated to the TCI state. If the UE applies the default spatial relationship and default PL-RS, it is unclear how to apply the updated PL-RS. Because it takes time to measure for the upper layer filter RSRP, the updated PL-RS cannot be applied immediately after updating the TCI state.

[0114] (DL receiving beam management) The UE may configure one or more TCI states on the serving cell. The UE completes switching of the active TCI state within a delay time. When the active TCI state is updated by the MAC CE, the time from when the updated TCI state (target TCI state) is applied (how long the delay time is) depends on whether the target TCI state is known (measured). If the target TCI is unknown (unmeasured), the UE may apply the target TCI state after the time when the target TCI becomes known.

[0115] The target TCI state is known if one or more of the following known conditions for TCI state are met: During the period from the last transmission of an RS resource used for L1-RSRP measurement reporting for the target TCI state to the completion of the active TCI state switching (TCI switching period), the RS resource for L1-RSRP measurement is an RS in the target TCI state or an RS QCL'd to the target TCI state. During the TCI switching period, a TCI state switching command is received within 1280 ms from the last transmission of the RS resource for beam reporting or measurement. During the TCI switching period, the UE has sent at least one L1-RSRP report for the target TCI state before the TCI state switch command. During the TCI switching period, the target TCI state is detectable. During the TCI switching period, the SSB associated with the target TCI state is detectable. During the TCI switching period, the signal-to-noise ratio (SNR) of the target TCI state is -3 dB or higher.

[0116] If the known conditions for multiple TCI states are not met, the target TCI state is unknown.

[0117] If the target TCI state is known, the UE shall, in response to receiving a PDSCH carrying a MAC CE activation command in slot n, HARQ +(3ms+TO k *(T first-SSB +T SSB-proc The UE may receive a PDCCH with the target TCI state of the serving cell where the TCI state switch occurs before slot n+T. HARQ +(3ms+TO k *(T first-SSB )) / NR slot length, a PDCCH with the old (pre-update) TCI state can be received.

[0118] where T HARQ is the time between DL data transmission and acknowledgement. first-SSB is the time from when the MAC CE command is decoded by the UE to the first SSC transmission. SSB-proc is 2ms. k is 1 if the target TCI state is not in the active TCI state list for the PDSCH, and is 0 otherwise.

[0119] If the target TCI state is unknown, then in response to receiving a PDSCH carrying a MAC CE activation command in slot n, the UE shall HARQ +(3ms+T L1-RSRP +TO uk *(T first-SSB +T SSB-proc The UE may receive a PDCCH with the target TCI state of the serving cell where the TCI state switch occurs before slot n+T. HARQ +(3ms+T L1-RSRP +TO uk *(T first-SSB)) / NR slot length, a PDCCH with the old (pre-update) TCI state can be received.

[0120] where T L1-RSRP is the time for L1-RSRP measurement for improving the receive beam. L1-RSRP is M=1, T Report T when =0 L1-RSRP_Measurement_Period_SSB T for CSI-RS L1-RSRP is M=1 for periodic CSI-RS and aperiodic CSI-RS when the number of resources in the resource set is at least equal to MaxNumberRxBeam, T Report T when =0 L1-RSRP_Measurement_Period_CSI-RS TO uk is 1 for CSI-RS-based L1-RSRP measurements and 0 for SSB-based L1-RSRP measurements when TCI state switching includes QCL type D. uk is 1 if the TCI state switch includes other QCL types. If the TCI state switch includes only QCL type A, QCL type B, or QCL type C, then for SSB in FR2, T L1-RSRP_Measurement_Period_SSB =0, and T in FR2 L1-RSRP_Measurement_Period_CSI-RS = 0. If the TCI state switch includes QCL type D, T first-SSB is the time to the first SSB measurement after the L1-RSRP measurement. For other ALC types, T first-SSB is the time to the first SSC transmission after the MAC CE command is decoded by the UE. For the target TCI state, the SSB is QCL type A or QCL type C.

[0121] If the target TCI state is unknown, the timing of switching to the target TCI state is T L1-RSRP It may be the timing when the above is added.

[0122] When the TCI state for the PDCCH or PDSCH is updated by the MAC CE, it is preferable for the UE that applies the default spatial relationship to adjust the default spatial relationship to the updated TCI state. However, the timeline for switching the default spatial relationship is unclear. Also, when the TCI state updated by the MAC CE is unknown, it is unclear how to switch the default spatial relationship.

[0123] Therefore, the present inventors have conceived a method for appropriately switching the default spatial relationship in response to updates of the TCI state based on the MAC CE.

[0124] 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.

[0125] In the present disclosure, "A / B" and "at least one of A and B" may be interchangeable. In the present disclosure, cell, CC, carrier, BWP, and band may be interchangeable. In the present disclosure, index, ID, indicator, and resource ID may be interchangeable. In the present disclosure, RRC parameter, higher layer parameter, RRC information element (IE), and RRC message may be interchangeable.

[0126] In the present disclosure, the terms TCI state, QCL assumption, QCL parameter, spatial-domain receive filter, UE spatial-domain receive filter, UE receive beam, DL receive beam, DL precoding, DL precoder, DL-RS, QCL type D RS in a TCI state or QCL assumption, and QCL type A RS in a TCI state or QCL assumption may be interchangeable. In the present disclosure, the terms QCL type D RS, DL-RS associated with QCL type D, DL-RS with QCL type D, source of DL-RS, SSB, and CSI-RS may be interchangeable.

[0127] In the present disclosure, spatial relationship, spatial relationship information, spatial relationship assumption, QCL parameter, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL transmit beam, UL precoding, UL precoder, spatially related RS, DL-RS, QCL assumption, SRI, spatial relationship based on SRI, and UL TCI may be interpreted as interchangeable.

[0128] In the present disclosure, the terms TRS, CSI-RS for tracking, CSI-RS having TRS information (higher layer parameter trs-Info), and NZP-CSI-RS resource in an NZP-CSI-RS resource set having TRS information may be read interchangeably.

[0129] In the present disclosure, DCI format 0_0, a DCI that does not include an SRI, a DCI that does not include an indication of spatial relationship, and a DCI that does not include a CIF may be interchangeable. In the present disclosure, DCI format 0_1, a DCI that includes an SRI, a DCI that includes an indication of spatial relationship, and a DCI that includes a CIF may be interchangeable.

[0130] In the present disclosure, a dedicated PUCCH and a PUCCH based on a dedicated PUCCH configuration (PUCCH-Config) may be interchangeable. In the present disclosure, a dedicated SRS and an SRS based on a dedicated SRS configuration (SRS-Config) may be interchangeable.

[0131] (Wireless communication method) In the present disclosure, the specific UL signal and the specific type of UL signal may be interchangeable. The specific UL signal may be at least one of a PUCCH (dedicated PUCCH), an SRS (dedicated SRS), a PUSCH scheduled by DCI format 0_1, and a PUSCH scheduled by DCI format 0_0.

[0132] In the present disclosure, a specific DL signal, a specific type of DL signal, a specific DL channel, and a specific type of DL channel may be interchangeable. The specific DL signal may be at least one of a PDCCH, a PDSCH, and a CORESET.

[0133] In the present disclosure, the TCI state updated by the MAC CE, the TCI state activated by the MAC CE, the TCI state indicated by the MAC CE, the target TCI state, the TCI state of the PL-RS activated by the MAC CE, the default spatial relationship of a specific UL signal, and the TCI state referenced by at least one of the default PL-RS may be interchangeable. In the present disclosure, 3 ms may be interchangeable with a specific time. The specific time does not have to be 3 ms. The specific time may be specified in a specification, may be set by an RRC parameter, or may be a value reported by the UE capability information. In the present disclosure, the number of measurement samples N may be specified in a specification, may be set by an RRC parameter, or may be a value reported by the UE capability information. N may be 5 or may not be 5.

[0134] If a specific UL signal satisfies the applicable conditions and the TCI state of a specific DL signal is updated by the MAC CE, at least one of the default spatial relationship and the default PL-RS of the specific UL signal may be switched to the target TCI state according to a specific timeline.

[0135] The application conditions may require at least one of the following: the frequency of the specific UL signal is within a specific frequency range (FR); specific upper layer parameters corresponding to the specific UL signal are set; specific UL signal conditions corresponding to the specific UL signal are satisfied; and the target TCI state is known.

[0136] The specific frequency range may be FR2 or may be other than FR1.

[0137] The specific upper layer parameter may correspond to a specific UL signal. If the specific UL signal is a PUSCH scheduled by DCI format 0_0, the corresponding specific upper layer parameter may be default beam path loss enable information (enableDefaultBeamPlForPUSCH0_0). If the specific UL signal is a dedicated PUCCH, the corresponding specific upper layer parameter may be default beam path loss enable information (enableDefaultBeamPlForPUCCH). If the specific UL signal is at least one of a dedicated SRS and a PUSCH scheduled by DCI format 0_1, the corresponding specific upper layer parameter may be default beam path loss enable information (enableDefaultBeamPlForSRS).

[0138] The combination of the specific UL signal and the specific UL signal condition for that signal may be at least one of the following specific UL signals 1 to 4.

[0139] [Specific UL signal 1] The specific UL signal is a dedicated PUCCH. The specific UL signal condition is that neither the spatial relationship nor the PL-RS is set for the specific UL signal.

[0140] [Specific UL signal 2] The specific UL signal is an individual SRS. The specific UL signal condition is that neither the spatial relationship nor the PL-RS is set for the specific UL signal.

[0141] [Specific UL signal 3] The specific UL signal is a PUSCH scheduled by DCI format 0_0. The specific UL signal condition is that for the specific UL signal, there is no PUCCH resource configuration on the active UL BWP or there is no active spatial relationship on the PUCCH resource on the active UL BWP.

[0142] [Specific UL signal 4] The specific UL signal is a PUSCH scheduled by DCI format 0_1. The specific UL signal condition is that for the specific UL signal, the corresponding SRS resource (the SRS resource indicated by the SRI) does not include a spatial relationship and a PL-RS.

[0143] If CORESET is configured in the active DL BWP on the CC of the specific UL signal, the specific DL signal may be a PDCCH. If CORESET is not configured in the active DL BWP on the CC of the specific UL signal, the specific DL signal may be a PDSCH.

[0144] <Embodiment 1> If the applicable conditions are met and the TCI state of a specific DL signal is updated by the MAC CE, at least one of the default spatial relationship and the default PL-RS for a specific UL signal may be switched according to a specific timeline, which may follow either of the following timelines 1 and 2.

[0145] [Timeline 1] The timeline for switching the default spatial relationship may be the same as the timeline for switching the default PL-RS, i.e., the timing for switching from the previous spatial relationship to the target TCI state may be the same as the timing for switching from the previous PL-RS to the target TCI state.

[0146] The UE may calculate the switching time of the default PL-RS and the switching time of the default spatial relationship, and may use the longer of the two calculated switching times as the switching time for both the default PL-RS and the default spatial relationship. The switching time may be the time from receiving a MAC CE updating the TCI state to switching of at least one of the default spatial relationship and the default PL-RS, or the time from transmitting an ACK to the MAC CE to switching of at least one of the default spatial relationship and the default PL-RS, or the time from 3 ms after transmitting an ACK to the MAC CE to switching of at least one of the default spatial relationship and the default PL-RS.

[0147] According to timeline 1, the default spatial relationship and the default PL-RS can always be the same, and the UE can calculate the transmit power appropriately.

[0148] [Timeline 2] The timeline for switching the default spatial relationship may be different from the timeline for switching the default PL-RS. The switching time for the default spatial relationship may be shorter than the switching time for the default PL-RS. For example, the UE may switch the default spatial relationship to the target TCI state 3 ms after sending an ACK to the MAC CE updating the TCI state, and switch the default PL-RS to the target TCI state later.

[0149] According to Timeline 2, the switching time of the default spatial relationship (UL transmit beam) can be shortened.

[0150] <Embodiment 2> If the applicable conditions are met and the TCI state of a particular DL signal is updated by the MAC CE, at least one of the default spatial relationship and the default PL-RS may be switched to that TCI state according to a particular timeline.

[0151] If the TCI state (target TCI state) indicated by the MAC CE (activation command) is known, the UE may switch the TCI state for reception of a specific DL signal to the target TCI state 3 ms after an ACK transmission for a PDSCH carrying the MAC CE (DL switching timing). In a specific timeline, the UE may switch at least one of the default spatial relationship and the default PL-RS of a specific UL signal to the target TCI state 3 ms+offset after the ACK transmission (UL switching timing). In the present disclosure, the terms offset and time offset may be interpreted as interchangeable.

[0152] For example, as shown in FIG. 7, if the MAC CE activates TCI state #1 and TCI state #1 is known, the UE switches the TCI state for a specific DL signal to TCI state #1 3 ms after transmitting an ACK to the MAC CE, and switches at least one of the default spatial relationship and default PL-RS of a specific UL signal to TCI state #1 after an offset time from that timing.

[0153] According to the second embodiment, even if the TCI state is updated by the MAC CE, the UE can appropriately switch at least one of the default spatial relationship and the default PL-RS.

[0154] <Embodiment 3> The offset in the second embodiment may be set by an RRC parameter, may be defined in the specifications, or may be a value reported by the UE capability information. The offset may be any of the following offsets 1 to 5.

[0155] Offset 1 0 (zero). The switching timing of at least one of the default spatial relationship and the default PL-RS may be 3 ms after the ACK transmission to the MAC CE (which may be the switching timing of the TCI state when the target TCI state is known). The UL switching timing may be the same as the DL switching timing.

[0156] Offset 2 x [ms] or x [slot]. x may be specified by the specification or set by an RRC parameter. x may depend on the subcarrier spacing (SCS) or slot length.

[0157] [Offset 3] An offset for switching the spatial relationship based on the MAC CE. The offset may be specified in the specification or configured by an RRC parameter. For example, if the target TCI state is known, the offset may be set to the TO k *(T first-SSB +T SSB-proc ) If the target TCI state is unknown, the offset may be L1-RSRP +TO uk *(T first-SSB +T SSB-proc ) may also be used.

[0158] [Offset 4] The time required for TCI state switching when the target TCI state is unknown. For example, the offset is the time T L1-RSRP It may be a time based on T L1-RSRP +TO uk *(T first-SSB +T SSB-proc For example, the offset may be the time T L1-SINR It may be a time based on T L1-SINR +TO uk *(T first-SSB +T SSB-proc ) may also be used.

[0159] Offset 5 The time from unknown to known target TCI state. For example, the offset is the time T for L1-RSRP measurement. L1-RSRP It may be a time based on T L1-RSRP For example, the offset may be set to the time T L1-SINR It may be a time based on T L1-SINR may be.

[0160] According to the third embodiment, the UE can switch at least one of the default spatial relationship and the default PL-RS at an appropriate time.

[0161] <Embodiment 4> The offset in embodiment 3 may depend on the type of parameter (reference parameter) referenced by at least one of the default spatial relationship and the default PL-RS. In the present disclosure, the reference parameter, the TCI state or QCL assumption, the reference parameter before the update, the reference parameter after the update, and the target TCI state may be interpreted as interchangeable.

[0162] The offset may depend on at least one of the following types of reference parameters:

[0163] [Type 1] The offset depends on whether the reference parameter is the TCI state for the PDCCH (CORESET) or the TCI state for the PDSCH. The offset when the reference parameter is the TCI state for the PDCCH and the offset when the reference parameter is the TCI state for the PDSCH may be different from each other.

[0164] The offset may depend on whether CORESET is configured in the active DL BWP on the CC. The offset when CORESET is configured in the active DL BWP on the CC may be different from the offset when CORESET is not configured in the active DL BWP on the CC. When CORESET is configured in the active DL BWP on the CC, the reference parameter is the TCI state for the PDCCH. When CORESET is not configured in the active DL BWP on the CC, the reference parameter is the TCI state for the PDSCH.

[0165] [Type 2] If the reference parameter is the TCI state for PDCCH (CORESET) (if CORESET is configured for the active DL BWP on the CC), the offset depends on whether the reference parameter is the TCI state or the QCL assumption. The offset when the reference parameter is the TCI state for PDCCH and the offset when the reference parameter is the TCI state for PDSCH may be different. If the TCI state is configured for CORESET, the UE uses this TCI state for PDCCH reception. If the TCI state is not configured for CORESET, the UE assumes that the SSB corresponding to the random access channel (RACH) transmission occasion (the SSB identified by the UE during the initial access procedure) is QCLed with the DM-RS antenna port associated with PDCCH reception, and uses this QCL assumption for PDCCH reception.

[0166] According to the fourth embodiment, the UE may use an appropriate offset according to the RS referenced by at least one of the default spatial relationship and the default PL-RS.

[0167] <Embodiment 5> The offset in embodiment 3 may have either of the following relationships 1 and 2 depending on whether the target TCI state is known or unknown.

[0168] [Relationship 1] The offset depends on whether the target TCI state is known or unknown, and different offsets may be used when the target TCI state is known and when the target TCI state is unknown.

[0169] If the target TCI state is known, the shorter offset (e.g., 0) of the two different offsets may be used. If the target TCI state is unknown, the longer offset (e.g., greater than 0) of the two different offsets may be used. The longer offset may be offset 4 in embodiment 3 or offset 5 in embodiment 3.

[0170] [Relationship 2] The offset does not depend on whether the target TCI state is known or unknown. The same offset may be used when the target TCI state is known and when the target TCI state is unknown. The UE may determine the receive beam / transmit beam (may determine / measure the RS of QCL Type-D) based on the unknown TCI state.

[0171] According to embodiment 5, the UE can use an appropriate offset whether the RS referenced by at least one of the default spatial relationship and the default PL-RS is known or unknown.

[0172] <Embodiment 6> The UE may perform either of the following operations 1 and 2 in a period corresponding to the offset in embodiment 2. The period corresponding to the offset may start 3 ms after the ACK transmission for the MAC CE and have the length of the offset.

[0173] [Operation 1] The UE transmits a specific UL signal applying / assuming the pre-updated spatial relationship.

[0174] [Operation 2] The UE transmits a specific UL signal applying / assuming the updated spatial relationship. During a period corresponding to the offset, a performance requirement may be relaxed. For example, the performance requirement may be defined by at least one of a required SNR and a required error rate.

[0175] According to embodiment 6, the UE can operate appropriately in switching the TCI state.

[0176] <Embodiment 7> If the MAC CE for the TCI state referenced by at least one of the default spatial relationship and the default PL-RS activates / updates the target TCI state and the target TCI state is known, the UE may count L1-RSRP measurement samples from 3 ms after the ACK transmission to the MAC CE and switch at least one of the default spatial relationship and the default PL-RS to the target TCI state in the slot next to the Nth sample.

[0177] In the present disclosure, N may be specified in a specification, configured by an RRC parameter, or reported by UE capability information. For example, N may be 5.

[0178] For example, as shown in FIG. 8, if a MAC CE for a TCI state referenced by a default PL-RS activates TCI state #1 and TCI state #1 is known, the UE may use TCI state #1 for the PL-RS in the next slot of the fifth L1-RSRP measurement 3 ms after the ACK transmission for that MAC CE.

[0179] If the MAC CE for the TCI state referenced by at least one of the default spatial relationship and the default PL-RS activates / updates the target TCI state and the target TCI state is unknown, the UE may count the L1-RSRP measurement samples from the time when the target TCI state becomes known (meets the known condition for TCI) and switch at least one of the default spatial relationship and the default PL-RS to the target TCI state in the slot next to the Nth sample.

[0180] For example, as shown in FIG. 9, if the MAC CE for the TCI state referenced by the default PL-RS activates TCI state #1 and TCI state #1 is unknown, the UE may use TCI state #1 for the PL-RS in the next slot of the fifth L1-RSRP measurement from the time TCI state #1 becomes known.

[0181] If the MAC CE for a TCI state referenced by at least one of the default spatial relationship and the default PL-RS activates / updates the target TCI state and the target TCI state is unknown, the UE has not measured the receive beam and therefore preferably waits for the measurement before switching to the target TCI state.

[0182] As an additional restriction to the case where the target TCI state (activated / updated TCI state) is known, if the target TCI state is unknown, T L1-RSRP As an additional restriction to the case where the target TCI state is known, if the target TCI state is unknown, then after N measurement samples, T L1-RSRP additional application time may be envisaged.

[0183] If both spatial relationship / PL-RS are configured in FR2 and the TCI state used for the default spatial relationship / default PL-RS is activated / updated by the MAC CE, the application timing for the upper layer filtered RSRP of the path loss measurement for the default PL-RS for PUCCH / SRS / PUSCH after the MAC CE is defined. The filtered RSRP value for the previous PL-RS is used before the application timing. If the TCI state of the default PL-RS is known, the application timing is the next slot after the fifth measurement sample, where the first measurement sample corresponds to the first instance 3 ms after the transmission of the ACL for the MAC CE. If the TCI state of the default PL-RS is unknown, the TCI state is set before the fifth measurement sample. L1-RSRP additional application time may be envisaged.

[0184] If a MAC CE for a TCI state referenced by at least one of the default spatial relationship and the default PL-RS activates / updates a target TCI state, and the target TCI state is unknown, the UE shall L1-RSRP After (3ms + T L1-RSRP After the Nth sample, the L1-RSRP measurement samples may be counted, and at least one of the default spatial relationship and the default PL-RS may be switched to the target TCI state in the slot following the Nth sample. L1-RSRP Instead of the time T for L1-SINR measurement, L1-SINR Alternatively, any of the offsets 1 to 5 in the third embodiment may be used.

[0185] For example, as shown in FIG. 10, if a MAC CE for a TCI state referenced by a default PL-RS activates TCI state #1 and TCI state #1 is unknown, the UE may set the ACK transmission time to 3 ms+T L1-RSRPIn the slot following the fifth last L1-RSRP measurement, TCI state #1 may be used for PL-RS.

[0186] If a MAC CE for a TCI state referenced by at least one of the default spatial relationship and the default PL-RS activates / updates a target TCI state, and the target TCI state is unknown, the UE counts L1-RSRP measurement samples from 3 ms after the ACK transmission to the MAC CE, and counts T from the measurement of the Nth sample. L1-RSRP In the next subsequent slot, at least one of the default spatial relationship and the default PL-RS may be switched to the target TCI state. L1-RSRP Instead of the time T for L1-SINR measurement, L1-SINR Alternatively, any of the offsets 1 to 5 in the third embodiment may be used.

[0187] According to the seventh embodiment, the UE can switch the default PL-RS at an appropriate timing.

[0188] <Embodiment 8> As shown in Figure 6, when the PL-RS list is configured by RRC parameters and a PL-RS (target PL-RS) different from the PL-RS (previous PL-RS) used for path loss calculation is activated by the MAC CE, the UE may switch the PL-RS using a timeline similar to that of embodiment 7.

[0189] If a PL-RS different from the previous PL-RS is activated by the MAC CE and the TCI state of the activated PL-RS is known, the UE may count L1-RSRP measurement samples from 3 ms after the ACK transmission to the MAC CE, and switch the previous PL-RS to the activated PL-RS in the next slot of the Nth sample.

[0190] For example, as shown in Figure 11, if a MAC CE activates a PL-RS#1 that is different from the previous PL-RS and the TCI status of PL-RS#1 is known, the UE may switch from the previous PL-RS to PL-RS#1 in the next slot of the fifth L1-RSRP measurement 3 ms after the ACK transmission to the MAC CE.

[0191] If a target PL-RS different from the previous PL-RS is activated / updated by the MAC CE and the TCI state of the target PL-RS is unknown, the UE may count the L1-RSRP measurement samples from the time when the TCI state of the target PL-RS becomes known (meets the known condition for TCI), and switch the previous PL-RS to the target PL-RS in the slot next to the Nth sample.

[0192] For example, as shown in Figure 12, if a MAC CE activates a PL-RS#1 that is different from the previous PL-RS and the TCI status of PL-RS#1 is unknown, the UE may switch from the previous PL-RS to PL-RS#1 in the next slot of the fifth L1-RSRP measurement from the time when the TCI status of PL-RS#1 becomes known.

[0193] If a target PL-RS different from the previous PL-RS is activated / updated by the MAC CE and the TCI state of the target PL-RS is unknown, the UE has not measured the received beam, so it is preferable to wait for the measurement time before switching the PL-RS.

[0194] As an additional restriction to the case where the TCI state of the target PL-RS (activated / updated PL-RS) is known, if the TCI state of the target PL-RS is unknown, T L1-RSRP As an additional restriction to the case where the TCI state of the target PL-RS is known, if the TCI state of the target PL-RS is unknown, then after N measurement samples, TL1-RSRP additional application time may be envisaged.

[0195] If a target PL-RS different from the previous PL-RS is activated / updated by the MAC CE and the TCI state of the target PL-RS is unknown, the UE shall L1-RSRP After (3ms + T L1-RSRP After that, the L1-RSRP measurement samples are counted, and in the slot following the Nth sample, the previous PL-RS may be switched to the target PL-RS. L1-RSRP Instead of the time T for L1-SINR measurement, L1-SINR Alternatively, any of the offsets 1 to 5 in the third embodiment may be used.

[0196] For example, as shown in FIG. 13, if a MAC CE for the TCI state referenced by the default PL-RS activates PL-RS#1 and the TCI state of PL-RS#1 is unknown, the UE may set the ACK transmission time to 3 ms+T L1-RSRP In the slot following the fifth last L1-RSRP measurement, the previous PL-RS may be switched to PL-RS#1.

[0197] If a target PL-RS different from the previous PL-RS is activated / updated by the MAC CE and the TCI state of the target PL-RS is unknown, the UE shall count the L1-RSRP measurement samples from 3 ms after the ACK transmission to the MAC CE, and count T from the measurement of the Nth sample. L1-RSRP In the next slot after T, the previous PL-RS may be switched to the target PL-RS. L1-RSRP Instead of the time T for L1-SINR measurement, L1-SINR Alternatively, any of the offsets 1 to 5 in the third embodiment may be used.

[0198] According to the eighth embodiment, the UE can switch the PL-RS at an appropriate timing.

[0199] (wireless communication system) The 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 thereof.

[0200] 14 is a diagram illustrating 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) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0201] The wireless communication system 1 may also support dual connectivity between multiple 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)), etc.

[0202] 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.

[0203] The wireless communication system 1 may support dual connectivity between multiple base stations within 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))).

[0204] 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 located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 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 base station 10.

[0205] 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).

[0206] 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 be a frequency band higher than FR2.

[0207] Furthermore, the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

[0208] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, 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.

[0209] 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, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0210] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0211] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0212] The radio access scheme may also be called a waveform. Note that 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.

[0213] 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 the downlink channel.

[0214] Furthermore, 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.

[0215] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0216] 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 for at least one of the PDSCH and the PUSCH.

[0217] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0218] 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 more search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0219] 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," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0220] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0221] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0222] 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, 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 as DL-RS.

[0223] 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 DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as reference signals.

[0224] 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 also be called a user equipment-specific reference signal (UE-specific reference signal).

[0225] (base station) 15 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 the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0226] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0227] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from 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.

[0228] 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 transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0229] 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.

[0230] The transmitting / receiving unit 120 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 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0231] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0232] 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.

[0233] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0234] 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.

[0235] The transceiver 120 (transmission processor 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.

[0236] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0237] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna .

[0238] 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.

[0239] 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.

[0240] 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), control plane data, etc. for the user terminal 20.

[0241] 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.

[0242] The transceiver 120 may transmit a Medium Access Control Element (MAC CE) indicating a Transmission Configuration Indication (TCI) state. If a specific uplink signal satisfies an applicable condition, the transceiver 120 may receive the specific uplink signal transmitted using a spatial relationship for the TCI state at a time later than an acknowledgement (ACK) transmission for the MAC CE.

[0243] The transceiver 120 may transmit a Medium Access Control - Control Element (MAC CE) indicating a Transmission Configuration Indication (TCI) state or a reference signal of a Path Loss Reference Signal (PL-RS). If the specific uplink signal satisfies the applicable condition, the transceiver 120 may receive the specific uplink signal transmitted using the reference signal for path loss calculation at a timing after an acknowledgement (ACK) transmission for the MAC CE.

[0244] (user terminal) 16 is a diagram showing an example of the configuration of a user terminal according to one 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.

[0245] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0246] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from 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.

[0247] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.

[0248] The transceiver 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 transceiver unit 220 may be configured from 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.

[0249] 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.

[0250] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0251] 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.

[0252] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0253] The transceiver 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.

[0254] The transceiver 220 (transmission processor 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 string to be transmitted, and output a baseband signal.

[0255] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0256] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0257] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0258] 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 to acquire user data, etc.

[0259] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, 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.

[0260] The transmitting section and 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.

[0261] The transceiver 220 may receive a Medium Access Control-Control Element (MAC CE) indicating a Transmission Configuration Indicator (TCI) state. If a specific uplink signal satisfies an applicable condition, the controller 210 may use the TCI state for the spatial relationship (e.g., at least one of a default spatial relationship and a default PL-RS) of the specific uplink signal at a timing (e.g., UL switching timing) after transmitting an acknowledgement (ACK) to the MAC CE.

[0262] The timing may be after 3 ms+time offset from the ACK transmission.

[0263] The time offset when the TCI state is configured for a physical downlink control channel and the time offset when the TCI state is configured for a physical downlink shared channel may be different from each other.

[0264] The offset when the TCI state satisfies the condition for being considered known and the offset when the TCI state does not satisfy the condition may be different from each other.

[0265] The transceiver 220 may receive a Medium Access Control - Control Element (MAC CE) indicating a Transmission Configuration Indicator (TCI) status or a reference signal for a Path Loss Reference Signal (PL-RS). If a specific uplink signal satisfies an applicable condition, the controller 210 may use the reference signal for path loss calculation of the specific uplink signal at a timing after an acknowledgement (ACK) transmission to the MAC CE.

[0266] If the reference signal is unknown, the timing may be a slot after N (eg, 5) measurements from the ACK transmission after 3 ms and time for measurements.

[0267] The measurement may be a Layer 1 Reference Signal Received Power (L1-RSRP) measurement.

[0268] The measurement may be a Layer 1 Signal to Interference and Noise Ratio (L1-SINR) measurement.

[0269] (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. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0270] 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, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As mentioned above, the implementation method of each is not particularly limited.

[0271] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 17 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may 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.

[0272] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may 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.

[0273] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0274] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0275] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as 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.

[0276] The processor 1001 also reads 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 in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0277] 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 read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0278] 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 disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), 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 a secondary storage device.

[0279] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. 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.

[0280] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0281] Furthermore, 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.

[0282] 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), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0283] (Variation) Note that terms explained in the present disclosure and terms necessary for understanding the present 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 interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0284] 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.

[0285] Here, the numerology may be a communication parameter applied to at least one of 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), the 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.

[0286] A slot may be composed of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol), and may be a time unit based on numerology.

[0287] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist 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.

[0288] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to 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 interchangeable.

[0289] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in 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.

[0290] Here, TTI refers to, for example, the smallest 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. However, the definition of TTI is not limited to this.

[0291] 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) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0292] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0293] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0294] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 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.

[0295] 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 numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0296] 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. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0297] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0298] 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.

[0299] 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 given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0300] The BWP may include an 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.

[0301] 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 read as "BWP."

[0302] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. 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, etc. may be changed in various ways.

[0303] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0304] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions 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 intended to be limiting in any way.

[0305] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0306] 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 multiple network nodes.

[0307] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0308] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, 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.

[0309] Note that 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. Furthermore, the RRC signaling may be called an RRC message, such as an RRC connection setup message or an RRC connection reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0310] 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).

[0311] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0312] 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.

[0313] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if 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), then these wired and / or wireless technologies are included within the definition of transmission media.

[0314] 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).

[0315] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "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," etc. may be used interchangeably.

[0316] 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. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0317] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0318] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0319] 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.

[0320] 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 mobile object, or the mobile object itself. The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (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 also include devices that do not necessarily move during communication operations. 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.

[0321] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments 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 multiple 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, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0322] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0323] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0324] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed 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 specific order presented.

[0325] Each aspect / embodiment described in the present disclosure may be related to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use 802.20, Ultra-Wide Band (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on and extend these systems. Furthermore, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0326] 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."

[0327] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. 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 in some way precede the second element.

[0328] 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, etc.

[0329] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0330] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0331] Furthermore, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," or the like.

[0332] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0333] 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 elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0334] 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, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0335] 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."

[0336] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0337] In this disclosure, where articles are 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.

[0338] 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 in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. a receiver that receives a first medium access control-control element (MAC CE) that activates a first TCI state that is a transmission configuration indication (TCI) state of a path loss reference signal (PL-RS) and a second MAC CE that indicates a second TCI state that is a TCI state of a control resource set (CORESET); If the first TCI state is known, switching to the PL-RS is performed at a first timing that is 3 ms after transmitting an acknowledgment (ACK) to the first MAC CE; If the first TCI state is unknown, switching to the PL-RS is performed at a second timing after a predetermined period of time has elapsed since an ACK transmission for the first MAC CE, where the predetermined period of time is a sum of 3 ms and a time for measuring Layer 1-Reference Signal Received Power (L1-RSRP); A terminal having: a control unit that uses the second TCI state for the spatial relationship of the SRS at a third timing 3 ms after an ACK transmission for the second MAC CE indicating the second TCI state when an upper layer parameter indicating the activation information of the default beam path loss of a measurement reference signal (SRS) is set and neither spatial relationship information nor PL-RS is set for the SRS.

2. receiving a first medium access control-control element (MAC CE) activating a first TCI state, which is a transmission configuration indication (TCI) state of a path loss reference signal (PL-RS), and a second MAC CE indicating a second TCI state, which is a TCI state of a control resource set (CORESET); If the first TCI state is known, switching to the PL-RS at a first timing that is 3 ms after transmitting an acknowledgment (ACK) to the first MAC CE; If the first TCI state is unknown, switching to the PL-RS at a second timing after a predetermined period of time has elapsed since transmitting an ACK for the first MAC CE, wherein the predetermined period of time is a sum of 3 ms and a time for measuring Layer 1-Reference Signal Received Power (L1-RSRP); When an upper layer parameter indicating activation information of a default beam path loss of a measurement reference signal (SRS) is set and neither spatial relationship information nor PL-RS is set for the SRS, at a third timing 3 ms after an ACK transmission for the second MAC CE indicating the second TCI state, the terminal wireless communication method includes the step of using the second TCI state for the spatial relationship of the SRS.

3. a transmitter that transmits a first medium access control-control element (MAC CE) that activates a first TCI state that is a transmission configuration indication (TCI) state of a path loss reference signal (PL-RS) and a second MAC CE that indicates a second TCI state that is a TCI state of a control resource set (CORESET); If the first TCI state is known, determine that switching to the PL-RS has occurred at a first timing 3 ms after transmission of an acknowledgment (ACK) to the first MAC CE; If the first TCI state is unknown, determine that switching to the PL-RS has occurred at a second timing after a predetermined period has elapsed since transmission of an ACK for the first MAC CE, where the predetermined period is a sum of 3 ms and a time for measuring Layer 1-Reference Signal Received Power (L1-RSRP); A base station having: a control unit that controls reception of the SRS transmitted using the second TCI state as the spatial relationship of the SRS at a third timing 3 ms after an ACK transmission for the second MAC CE indicating the second TCI state, when an upper layer parameter indicating activation information of the default beam path loss of a measurement reference signal (SRS) is set and neither spatial relationship information nor PL-RS is set for the SRS.

4. A system having a terminal and a base station, The terminal a receiver that receives a first medium access control-control element (MAC CE) that activates a first TCI state that is a transmission configuration indication (TCI) state of a path loss reference signal (PL-RS) and a second MAC CE that indicates a second TCI state that is a TCI state of a control resource set (CORESET); If the first TCI state is known, switching to the PL-RS is performed at a first timing that is 3 ms after transmitting an acknowledgment (ACK) to the first MAC CE; If the first TCI state is unknown, switching to the PL-RS is performed at a second timing after a predetermined period of time has elapsed since an ACK transmission for the first MAC CE, where the predetermined period of time is a sum of 3 ms and a time for measuring Layer 1-Reference Signal Received Power (L1-RSRP); A control unit that uses the second TCI state for the spatial relationship of the SRS at a third timing 3 ms after an ACK transmission for the second MAC CE indicating the second TCI state when an upper layer parameter indicating enablement information of a default beam path loss of a measurement reference signal (SRS) is set and neither spatial relationship information nor PL-RS is set for the SRS, The base station A system comprising a transmitter that transmits the first MAC CE and the second MAC CE.

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