Terminal, wireless communication method, base station, and system

Abstract

The present invention appropriately implements STRP / MTRP PUSCH transmission. A terminal according to an aspect of the present disclosure comprises: a receiving unit for receiving downlink control information including a first sounding reference signal (SRS) resource indicator (SRS resource indicator: SRI) field and a second SRI field; and a control unit for performing codebook based uplink transmission scheduled by the downlink control information, using a first panel determined on the basis of the first SRI field and a second panel determined on the basis of the second SRI field.

Description

Terminal, wireless communication method and base station

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

[0002] Long Term Evolution (LTE) has been specified for the Universal Mobile Telecommunications System (UMTS) network with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) has been 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, etc.) are also being considered.

[0004] 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

[0005] In future wireless communication systems (e.g., NR), it is considered that one or more Transmission / Reception Points (TRPs) (Multi-TRPs (MTRPs)) will perform DL transmission to a user terminal (User Equipment (UE)). It is also considered that a UE will perform UL transmission using one or more panels to one or more TRPs.

[0006] Furthermore, in future wireless systems (e.g., NR after Rel. 17), repeated transmission of MTRP via the Physical Uplink Shared Channel (PUSCH) is being considered.

[0007] However, there is still no progress in the study of how to control / configure the Single TRP (STRP) / MTRP PUSCH for UEs with multiple panels. If these are not properly specified, there is a risk that communication throughput, communication quality, etc. will deteriorate.

[0008] Therefore, one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately perform STRP / MTRP PUSCH transmission.

[0009] A terminal according to one aspect of the present disclosure includes: a receiving unit that receives downlink control information including a first Sounding Reference Signal (SRS) Resource Indicator (SRI) field and a second SRI field; and a control unit that controls codebook-based uplink transmission scheduled by the downlink control information using a first panel determined based on the first SRI field and a second panel determined based on the second SRI field.

[0010] According to one aspect of the present disclosure, STRP / MTRP PUSCH transmission can be appropriately performed.

[0011] FIG. 1 is a diagram illustrating an example of an SRS resource set configured in the first embodiment. FIG. 2 is a diagram illustrating an example of a correspondence relationship between a value of the SRI field, an SRS resource set, and an SRS resource in embodiment 1.1.1. FIG. 3 is a diagram illustrating an example of a correspondence relationship between a value of the SRSI field and an SRS resource set in embodiment 1.1.2. FIGS. 4A and 4B are diagrams illustrating an example of designating an SRS resource set in embodiment 1.2. FIG. 5 is a diagram illustrating an example of an SRS resource set configured in the second embodiment. FIGS. 6A and 6B are diagrams illustrating an example of an SRS resource set in a modified embodiment of embodiment 2.2. FIGS. 7A and 7B are diagrams illustrating another example of an SRS resource set in a modified embodiment of embodiment 2.2. FIG. 8 is a diagram illustrating an example of an SRS resource set configured in the third embodiment. FIG. 9 is a diagram illustrating an example of a correspondence relationship between a value of the SRI field, an SRS resource set, and an SRS resource in embodiment 3.1.1. FIG. 10 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 11 is a diagram illustrating an example of a configuration of a base station according to an embodiment. Fig. 12 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. Fig. 13 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment.

[0012] (Spatial Relationship for SRS, PUSCH) In Rel. 15 / 16 NR, a UE may receive information (SRS configuration information, for example, parameters in the RRC control element "SRS-Config") used to transmit a measurement reference signal (e.g., a sounding reference signal (SRS)).

[0013] Specifically, the UE may receive at least one of information regarding one or more SRS resource sets (SRS resource set information, e.g., the RRC control element "SRS-ResourceSet") and information regarding one or more SRS resources (SRS resource information, e.g., the RRC control element "SRS-Resource").

[0014] An SRS resource set may be associated with (group together) a predetermined number (e.g., one or more) of SRS resources, each of which may be identified by an SRS Resource Indicator (SRI) or SRS Resource Identifier (ID).

[0015] The SRS resource set information may include an SRS resource set ID (SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, an SRS resource type (e.g., periodic SRS, semi-persistent SRS, or aperiodic SRS), and information on SRS usage.

[0016] Here, the SRS resource type may indicate any one of periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic CSI (Aperiodic SRS (A-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.

[0017] Furthermore, the usage ("usage" of the RRC parameter, "SRS-SetUse" of the L1 (Layer-1) parameter) may be, for example, beam management, codebook (CB), non-codebook (NCB), antenna switching, etc. The SRS for codebook (CB) or non-codebook (NCB) usage may be used to determine a codebook-based or non-codebook-based precoder for PUSCH transmission based on the SRI.

[0018] 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.

[0019] The SRS resource information may include an SRS resource ID (SRS-ResourceId), the number of SRS ports, the 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.

[0020] The spatial relationship information of the SRS (e.g., the RRC information element "spatialRelationInfo") may indicate spatial relationship information between a predetermined reference signal and the SRS. The predetermined reference signal may be at least one of a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Channel State Information Reference Signal (CSI-RS), and an SRS (e.g., another SRS). The SS / PBCH block may be referred to as a Synchronization Signal Block (SSB).

[0021] The spatial relationship information of the SRS may include at least one of an SSB index, a CSI-RS resource ID, and an SRS resource ID as an index of the predetermined reference signal.

[0022] In the present disclosure, the SSB index, SSB resource ID, and SSB Resource Indicator (SSBRI) may be interchangeable. Furthermore, the CSI-RS index, CSI-RS resource ID, and CSI-RS Resource Indicator (CRI) may be interchangeable. Furthermore, the SRS index, SRS resource ID, and SRI may be interchangeable.

[0023] The spatial relationship information of the SRS may include a serving cell index, a BWP index (BWP ID), etc. corresponding to the predetermined reference signal.

[0024] When the UE is configured with spatial relationship information regarding an SRS and an SSB or CSI-RS for a certain SRS resource, 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.

[0025] When the UE is configured with spatial relationship information between another SRS (reference SRS) and the target SRS for a certain SRS (target SRS), the UE may transmit the target SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter (spatial domain transmit filter) for transmitting the reference SRS. That is, in this case, the UE may assume that the UE transmit beam of the reference SRS and the UE transmit beam of the target SRS are the same.

[0026] 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 predetermined field (e.g., an SRS resource identifier (SRI) field) in the DCI. Specifically, the UE may use spatial relationship information of the SRS resources (e.g., the RRC information element "spatialRelationInfo") determined based on the value of the predetermined field (e.g., the SRI) for PUSCH transmission.

[0027] In Rel. 16 NR, when codebook-based PUSCH transmission is used, a UE may be configured with one SRS resource set with usage = CB, and two SRS resources for that SRS resource set may be configured by RRC, with one of the two SRS resources indicated by DCI (e.g., a 1-bit SRI field). Note that SRS resources in the same SRS resource set may have the same number of ports (number of SRS ports) except when full power mode 2 is configured (e.g., the upper layer parameter ul-FullPowerTransmission-r16 is set to fullpowerMode2).

[0028] In Rel. 16 NR, when non-codebook-based PUSCH transmission is used, a UE may be configured with one SRS resource set with purpose = NCB, and four SRS resources per SRS resource set may be configured by RRC, and one or a combination of the four SRS resources may be indicated by DCI (e.g., a 2-bit SRI field). Note that each SRS resource in the SRS resource set with purpose = NCB may have one port.

[0029] (Multi-TRP) In NR, one or more transmission / reception points (Transmission / Reception Points (TRP)) (Multi-TRP (M-TRP)) are considered to perform DL transmission to a UE using one or more panels (multi-panels). It is also considered that a UE performs UL transmission to one or more TRPs using one or more panels.

[0030] In future wireless systems (e.g., NR Rel. 17 and later), it is being considered to indicate multiple (e.g., two) SRS Resource Indicators (SRIs) / Transmitted Precoding Matrix Indicators (TPMIs) using a single DCI for performing PUSCH repetition transmission of multiple TRPs (MTRP PUSCH repetition).

[0031] For example, in the case of codebook-based transmission, the UE may determine a precoder for PUSCH transmission based on the SRI, a Transmitted Rank Indicator (TRI), and the TPMI. In the case of non-codebook-based transmission, the UE may determine a precoder for PUSCH transmission based on the SRI. Note that the SRI may be specified to the UE by the DCI or may be provided by higher layer parameters.

[0032] When a single DCI indicates multiple SRI / TPMIs, the following Option 1 or Option 2 can be considered: - Option 1: A field indicating multiple (e.g., two) SRI / TPMIs is used to indicate SRI / TPMI (values) for multiple (e.g., two) TRPs; - Option 2: A field indicating one SRI / TPMI is indicated, and a code point corresponding to the multiple (e.g., two) SRI / TPMI values ​​is set in the field indicating the SRI / TPMI.

[0033] In Option 1, each code point in multiple SRI / TPMI fields may correspond to one TPMI value. The correspondence (association) between the SRI / TPMI fields and the SRI / TPMI values ​​may be defined in advance in the specifications. Furthermore, the correspondence (association) between the SRI / TPMI fields and the SRI / TPMI values ​​may be the correspondence defined up to Rel. 16 or the correspondence defined in Rel. 17 or later. The correspondence between the SRI / TPMI fields and the SRI / TPMI values ​​may differ for each of the multiple SRI / TPMI fields.

[0034] In Option 2, a code point indicating one SRI / TPMI field may correspond to multiple (e.g., two) SRI / TPMI values. The correspondence (association) between the SRI / TPMI field and the SRI / TPMI value may be defined in advance in a specification, or may be notified / configured / activated by RRC signaling / MAC CE.

[0035] It is being considered that a DCI can dynamically indicate / switch between single PUSCH transmission / repeated PUSCH transmission using a single TRP (Single TRP (STRP)) and repeated PUSCH transmission using multiple TRPs (Multi TRP (MTRP)). This dynamic switching may utilize a specific field included in DCI defined up to Rel. 16, or a specific field defined in Rel. 17 or later (e.g., a field for specifying STRP or MTRP operation).

[0036] Furthermore, the term "dynamic switch" in the present disclosure may refer to a "switch that uses at least one of higher layer signaling and physical layer signaling." Furthermore, the term "switch" in the present disclosure may be interchangeably read as switching, change, changing, applying, instructing, setting, and the like.

[0037] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0038] 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.

[0039] In the case where the above-mentioned single DCI indicates multiple SRIs / TPMIs, it is being considered to make the number of SRS ports between the two TRPs the same. Also, when a UE has multiple panels, it is being considered to control the beam direction of the PUSCH for each panel.

[0040] However, regarding the STRP / MTRP PUSCH, how to notify SRI for a UE with multiple panels and how to configure the SRS resource set have not yet been studied. If these are not properly specified, there is a risk that communication throughput, communication quality, etc. will be degraded.

[0041] Therefore, the present inventors have conceived a method for appropriately indicating the SRI of the STRP / MTRP PUSCH and configuring the SRS resource set.

[0042] 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.

[0043] In the present disclosure, "A / B" and "at least one of A and B" may be read interchangeably.

[0044] In the present disclosure, the terms activate, deactivate, indicate, select, configure, update, determine, etc. may be read interchangeably.

[0045] In the present disclosure, RRC, RRC parameters, RRC messages, RRC signaling, higher layer parameters, information elements (IEs), and configurations may be interchangeable. In the present disclosure, MAC CE, update commands, and activation / deactivation commands may be interchangeable. In the present disclosure, supporting, controlling, controllable, operating, and operable may be interchangeable.

[0046] In the present disclosure, the terms panel, UE panel, beam, panel group, beam group, precoder, Uplink (UL) transmitting entity, TRP, spatial relationship information (SRI), spatial relationship, SRS Resource Indicator (SRI), SRS resource, control resource set (CONTROLLER RESOLUTION SET (CORESET)), Physical Downlink Shared Channel (PDSCH), codeword, base station, predetermined antenna port (e.g., Demodulation Reference Signal (DMRS) port), predetermined antenna port group (e.g., DMRS port group), predetermined group (e.g., Code Division Multiplexing (CDM) group, predetermined reference signal group, CORESET group), predetermined resource (e.g., predetermined reference signal resource), predetermined resource set (e.g., predetermined reference signal resource set), CORESET pool, PUCCH group (PUCCH resource group), spatial relationship group, downlink TCI state (DLTCI state), The terms unified TCI state, common TCI state, QCL, QCL assumption, etc. may be read interchangeably.

[0047] Furthermore, the TCI state identifier (ID) and the TCI state may be interchangeable. The TCI state and the TCI may be interchangeable.

[0048] In this disclosure, the terms index, ID, indicator, and resource ID may be interchangeable. In this disclosure, the terms sequence, list, set, group, cluster, and subset may be interchangeable.

[0049] In the present disclosure, the terms TRP index, CORESET pool index (CORESETPoolIndex), pool index, group index, etc. may be read interchangeably.

[0050] In the present disclosure, terms such as a list, a group, a cluster, a subset, etc. may be interchangeable. In the present disclosure, terms such as Spatial Relation Information (SRI), an SRS Resource Indicator (SRI) (or an SRI field), an SRS resource, an SRS resource set, a precoder, etc. may be interchangeable.

[0051] In the present disclosure, spatial relationship information (SRI), SRI combination, SRI for codebook-based transmission, non-codebook-based SRI combination, spatialRelationInfo, UL TCI, TCI state, Unified TCI, QCL, etc. may be read interchangeably.

[0052] In the present disclosure, the first TRP and the second TRP may be interchangeably read as the first PUSH and the second PUSH, the first PUSH transmission opportunity and the second PUSH transmission opportunity, the first SRI and the second SRI, etc.

[0053] In the present disclosure, a first TRP (e.g., TRP #1) and a second TRP (e.g., TRP #2) have a first spatial relationship (e.g., 1 st Alternatively, the first TRP (e.g., TRP #1) and the second TRP (e.g., TRP #2) may correspond to the spatial relation / beam / UL TCI / QCL associated with the first SRI field or the first TPMI field and the spatial relation / beam / UL TCI / QCL associated with the second SRI field or the second TPMI field, respectively. Alternatively, the first TRP (e.g., TRP #1) and the second TRP (e.g., TRP #2) may correspond to a first SRS resource set whose usage is CB / NCB (e.g., usage=CB / NCB) and a second SRS resource set whose usage is CB / NCB (e.g., usage=CB / NCB), respectively.

[0054] In the present disclosure, for a single DCI, the i-th TRP (TRP#i) may refer to the i-th TCI state, the i-th CDM group, etc. (i is an integer). For a multi-DCI, the i-th TRP (TRP#i) may refer to the CORESET corresponding to CORESET pool index=i, the i-th TCI state, the i-th CDM group, etc. (i is an integer).

[0055] In addition, in the repeated PUSCH, the same codeword / transport block may be transmitted in each PUSCH (each repetition). The repeated PUSCH may be interchangeably read as multiple PUSCHs having the same content (e.g., data / codeword / transport block).

[0056] In the present disclosure, MTRP PUSCH repetition may be interchangeably read as two PUCCH repetitions for two TRPs, two PUSCH repetitions using two SRIs, two PUSCH repetitions using two sets of power control parameters (power control parameters are described below), etc.

[0057] In this disclosure, repetition of a STRP PUSCH may refer to repeated transmission of multiple PUSCHs transmitted using one (same) SRI / power control parameter set / beam / precoder. Note that a single transmission may refer to a PUSCH transmission transmitted using one SRI / power control parameter set / beam / precoder. In this disclosure, the STRP PUSCH may refer to both repeated and single transmission of a STRP PUSCH.

[0058] In addition, PUSCH repetition / PUSCH transmission for TRP1 may mean PUSCH repetition / PUSCH transmission using the first SRI (or SRI field) / first power control parameter set.

[0059] Furthermore, PUSCH repetition / PUSCH transmission for TRP2 may mean PUSCH repetition / PUSCH transmission using a second SRI (or SRI field) / second power control parameter set.

[0060] In the present disclosure, the power control parameter is P ＣＭＡＸ，ｆ，ｃ , Maximum Power Reduction (MPR), Power Management Maximum Power Reduction (P-MPR), Additional Maximum Power Reduction (A-MPR), ΔTc, P ０ , alpha, a pathloss reference signal (PL-RS), and a closed-loop index (l).

[0061] In the following embodiments, repeated transmission of PUSCH for multiple TRPs may be interchangeably referred to as PUSCH across multiple TRPs, repeated PUSCH across multiple TRPs, simply repeated PUSCH, repeated transmission, multiple PUSCH transmission, etc. Also, a single PUSCH transmission for a single TRP may be simply referred to as a single PUSCH transmission, PUSCH transmission in a single TRP, etc.

[0062] In this disclosure, repeated transmission of a PUSH for a single TRP may mean repeated transmission of multiple PUSHs transmitted using the same SRI / beam / precoder.

[0063] In the present disclosure, repeated transmission of PUSCHs for multiple TRPs may refer to repeated transmission of multiple PUSCHs using different SRIs / beams / precoders. The repeated transmission and multiple SRIs / beams / precoders may be cyclic, sequential in a specific number, or using a half-half pattern (mapping), as detailed in the above mapping pattern.

[0064] In addition, in each embodiment of the present disclosure, the case where the number of TRPs, SRIs, etc. is two is mainly described as an example, but these numbers may be three or more. Furthermore, the term "dynamic switch" in the present disclosure may mean "a switch that uses at least one of higher layer signaling and physical layer signaling." Furthermore, the term "switch" in the present disclosure may be interchangeably read as switching, change, changing, application, etc.

[0065] In each embodiment of the present disclosure, UL transmission is described using an example of PUSCH transmission for a single / multiple TRPs using one DCI, but the PUSCH transmission to which each embodiment can be applied is not limited to this.

[0066] Furthermore, each embodiment of the present disclosure may be appropriately applied to repeated transmission of any UL signal / channel for multiple TRPs, and the PUSCH of the present disclosure may be read as any UL signal / channel. For example, each embodiment of the present disclosure may be appropriately applied to repeated transmission of PUCCH for multiple TRPs, and the PUSCH of the present disclosure may be read as PUCCH.

[0067] In addition, in each embodiment of the present disclosure, the case where the number of multiple TRPs, multiple SRIs, etc. is two is mainly described as an example, but these numbers may be three or more. In other words, "two" in the present disclosure may be read as "multiple."

[0068] Furthermore, the SRS resource set in the following embodiments may be replaced with an SRS resource set whose purpose is a codebook or non-codebook, or may be replaced with an SRS resource set whose purpose is other purposes. For example, the SRS resource set in an embodiment assuming a CB-based PUSCH may be replaced with an SRS resource set whose purpose is a codebook, or may be replaced with an SRS resource set whose purpose is other purposes. Furthermore, the SRS resource set in an embodiment assuming an NCB-based PUSCH may be replaced with an SRS resource set whose purpose is non-codebook, or may be replaced with an SRS resource set whose purpose is other purposes.

[0069] Furthermore, in the present disclosure, the i-th SRS resource / SRS resource set (i is an integer) may be interpreted as the SRS resource / SRS resource set having the smallest (or largest) ID (e.g., SRS resource ID, SRS resource set ID, entry index). The i-th SRS resource / SRS resource set (i is an integer) may refer to the SRS resource / SRS resource set having the smallest (or largest) ID (e.g., SRS resource ID, SRS resource set ID, entry index) among active SRS resources / SRS resource sets.

[0070] In the following embodiments, "UE" may be interpreted as at least one of a UE having multiple panels, a UE supporting multiple panel operation, and a UE in which multiple panel operation is configured, or as other UEs (e.g., a UE in which multiple panel operation is not configured, or a UE in which full power mode 2 is configured (e.g., the upper layer parameter ul-FullPowerTransmission-r16 is set to fullpowerMode2)).

[0071] In the following embodiments, "DCI" may refer to a DCI (e.g., DCI format 0_0 / 0_1 / 0_2) for scheduling an UL transmission (e.g., PUSCH), or may refer to other DCI formats.

[0072] (Wireless Communication Method) First Embodiment The first embodiment relates to indication of an SRI assuming a CB-based PUSCH.

[0073] In the first embodiment, the UE is configured with at least two SRS resource sets, where the SRS resources included in the same SRS resource set have the same number of ports, and the SRS resources included in different SRS resource sets may have different or the same number of ports.

[0074] 1 is a diagram illustrating an example of SRS resource sets configured in the first embodiment. In this example, two SRS resource sets (SRS resource sets #1 and #2) are configured in a UE. SRS resource set #1 includes two SRS resources (SRS resources #1 and #2) with a port count of 2, and SRS resource set #2 includes two SRS resources (SRS resources #3 and #4) with a port count of 4.

[0075] The first embodiment is roughly divided into embodiment 1.1 for STRP PUSCH and embodiment 1.2 for MTRP PUSCH.

[0076] [Embodiment 1.1] In embodiment 1.1, any one or a combination of embodiments 1.1.1 to 1.1.5 may be used as a method for a UE to identify which SRS resource in which SRS resource set to use for STRP PUSCH transmission.

[0077] In addition, in embodiment 1.1, one SRS resource set may be considered to correspond to one panel. The UE may transmit a PUSCH (PUSCH repetition, PUSCH transmission opportunity) using a certain SRS resource set using a panel determined based on the SRS resource set.

[0078] Embodiment 1.1.1 In embodiment 1.1.1, the UE determines both the SRS resource set and the SRS resource based on one SRI field.

[0079] 2 is a diagram illustrating an example of a correspondence relationship between a value of the SRI field and an SRS resource set and an SRS resource according to embodiment 1.1.1. In the present disclosure, the terms field value, field, code point, etc. may be interchangeable.

[0080] In this example, SRI code points 0 to x (x is an integer, x=1 in FIG. 2) correspond to the first to x+1 SRS resources in the first SRS resource set, respectively, and SRI code points x+1 to x+1+y (y is an integer, y=1 in FIG. 2) correspond to the first to y+1 SRS resources in the second SRS resource set, respectively.

[0081] It may be assumed that the size of the SRI field in embodiment 1.1.1 is determined based on the total number of SRS resources in all SRS resource sets of a particular purpose (e.g., purpose is codebook) configured for the UE.

[0082] [Embodiment 1.1.2] In embodiment 1.1.2, the UE may identify an SRS resource set based on an SRS Resource Set Indicator (SRSI) field newly included in the DCI, and determine the SRS resources within the SRS resource set based on the SRI field.

[0083] 3 is a diagram illustrating an example of a correspondence relationship between values ​​of the SRSI field and SRS resource sets in embodiment 1.1.2. In this example, an SRSI code point of 0 indicates a first SRS resource set, and an SRSI code point of 1 indicates a second SRS resource set.

[0084] The size of the SRI field in embodiment 1.1.2 may be assumed to be determined based on the total number of SRS resource sets for a specific purpose (e.g., a codebook) configured in the UE. The size of the SRI field may also be assumed to be determined based on the maximum number of SRS resources in one SRS resource set among the SRS resource sets for the specific purpose. For example, if a first SRS resource set has two SRS resources and a second SRS resource set has one SRS resource, the size of the SRI field in embodiment 1.1.2 may be expressed as one bit (which can specify two SRS resources).

[0085] Note that the SRSI field may not be a new field, but may be represented by an existing DCI field defined in Rel. 15 / 16 NR.

[0086] [Embodiment 1.1.3] In embodiment 1.1.3, the UE may be designated (or activated) an SRS resource set to be used for the STRP PUSCH from one or more SRS resource sets by the MAC CE, and the UE may determine the SRS resource within the designated (or activated) SRS resource set based on the SRI field.

[0087] This MAC CE may be a new MAC CE for specifying an SRS resource set for the STRP PUSCH, or may be an existing MAC CE specified in Rel. 15 / 16 NR. For example, among the existing MAC CEs, at least one field (e.g., a field that was previously reserved), such as an SP SRS Activation / Deactivation MAC CE, an Enhanced SP / AP SRS Spatial Relation Indication MAC CE, an SRS Pathloss Reference RS Update MAC CE, or a Serving Cell Set based SRS Spatial Relation Indication MAC CE, may be used as a field indicating whether the SRS resource set specified by the MAC CE is used / not used for STRP PUSCH.

[0088] The MAC CE of embodiment 1.1.3 may be used to specify the SRS resource set corresponding to the SRSI field of embodiment 1.1.2, or may be used to further restrict the SRS resource set of embodiment 1.1.4 described below.

[0089] [Embodiment 1.1.4] In embodiment 1.1.4, the UE may be configured, by an RRC parameter, to specify an SRS resource set to be used for the STRP PUSCH from one or more SRS resource sets, and the UE may determine an SRS resource within the specified SRS resource set based on the SRI field.

[0090] [Embodiment 1.1.5] In embodiment 1.1.5, the UE may determine an SRS resource set to be used for the STRP PUSCH, report the determined SRS resource set to the network (e.g., base station), and determine SRS resources within the reported SRS resource set based on the SRI field.

[0091] In embodiment 1.1.5, the SRS resource set to be used for the STRP PUSCH may be determined by the UE based on at least one of any higher layer signaling (e.g., RRC signaling, MAC CE), physical layer signaling (e.g., DCI), RS, RS measurement results, UE capabilities, etc.

[0092] The UE may report information about the SRS resource set used for the STRP PUSCH (for example, the index of the SRS resource set) using, for example, a MAC CE, a UCI, an RS, or a combination thereof.

[0093] [Embodiment 1.2] In embodiment 1.2, the UE determines the SRS resource set / SRS resource for the MTRP PUSCH based on two SRI fields.

[0094] In addition, in embodiment 1.2, one SRS resource set may be considered to correspond to one panel. The UE may transmit a PUSCH (PUSCH repetition, PUSCH transmission opportunity) using a certain SRS resource set using a panel determined based on the SRS resource set.

[0095] 4A and 4B are diagrams illustrating an example of specifying an SRS resource set in embodiment 1.2. In this example, it will be described which of two SRS resource sets (SRS resource sets #1 and #2) configured in a UE can be specified by the first SRI field and the second SRI field included in the DCI.

[0096] In Figure 4A, two SRI fields indicate the same SRS resource set (SRS resource set #1 in this example). For example, if the number of SRS resource ports in the two SRS resource sets is different, the two SRI fields in the DCI received by the UE may indicate the same SRS resource set so that the number of SRS ports for the two TRPs is the same. In this case, the two SRI fields may indicate SRS resources of the same UE panel.

[0097] 4A shows two SRI fields with different SRS resource sets, and the number of ports for each UE panel / SRS resource set may be different or the same.

[0098] Embodiment 1.2 can be broadly divided into the following three types depending on the number of SRS resource sets configured in the UE and the number of SRS ports between the SRS resource sets: - Embodiment 1.2.1: The number of SRS resource sets configured in the UE is 2. The number of SRS resource ports in the same SRS resource set is the same, and the number of SRS resource ports included in different SRS resource sets is also the same. - Embodiment 1.2.2: The number of SRS resource sets configured in the UE is 2. The number of SRS resource ports in the same SRS resource set is the same, and the number of SRS resource ports included in different SRS resource sets is different. - Embodiment 1.2.3: The number of SRS resource sets configured in the UE is 4. The number of SRS resource ports in the same SRS resource set is the same, and the number of SRS resource ports included in different SRS resource sets is different.

[0099] [Embodiment 1.2.1] In embodiment 1.2.1, the number of SRS ports common to an SRS resource set may be determined / set based on UE capabilities, or may be determined / set based on a UE panel having a minimum or maximum number of antenna ports (or the minimum or maximum number of antenna ports), or may be determined / set based on both of these.

[0100] [[Embodiment 1.2.2]] In embodiment 1.2.2, as in embodiment 1.1 above, one SRS resource set may be considered to correspond to one panel.

[0101] In embodiment 1.2.2, the UE may assume that each of the two SRI fields included in the DCI specifies both an SRS resource set and an SRS resource, as in embodiment 1.1.1. In this case, the UE may assume that the two SRS resources specified by the two SRI fields have the same port number.

[0102] In addition, in Embodiment 1.2.2, the UE may assume that the first SRI field of the two SRI fields included in the DCI specifies both an SRS resource set and an SRS resource, as in Embodiment 1.1.1, in which case the UE may assume that the second SRI field indicates only SRS resources in the SRS resource set specified by the first SRI field, or only SRS resources having the same number of ports as the SRS resources specified by the first SRI field.

[0103] For example, if the first SRI field indicates SRS resources of a first SRS resource set, the UE may determine that the second SRI field indicates SRS resources within the first SRS resource set.

[0104] In addition, in Embodiment 1.2.2, the UE may determine one of the SRS resource sets to be used for the MTRP PUSCH by DCI / MAC CE / RRC or based on a UE report, as in Embodiments 1.1.2-1.1.5. The UE may assume that both SRI fields specify SRS resources within the specified / reported SRS resource set, or may assume that the first SRI field specifies SRS resources within the specified / reported SRS resource set and the second SRI field specifies SRS resources within an SRS resource set other than the specified / reported SRS resource set.

[0105] [[Embodiment 1.2.3]] In embodiment 1.2.3, one SRS resource set may be considered to correspond to one TRP and one panel combination. For example, four SRS resource sets may correspond to TRP1+UE panel 1, TRP1+UE panel 2, TRP2+UE panel 1, and TRP2+UE panel 2, respectively.

[0106] In embodiment 1.2.3, the UE may transmit a PUSCH (PUSCH repetition, PUSCH transmission opportunity) using a certain SRS resource set to a TRP corresponding to the SRS resource set using a panel determined based on the SRS resource set.

[0107] The correspondence between the SRS resource set and the UE panel may be determined in advance by a specification, or may be specified / determined by higher layer signaling, physical layer signaling, UE capability, or a combination thereof.

[0108] Note that SRS resource sets corresponding to the same UE panel may be assumed to have the same number of SRS ports, and SRS resource sets corresponding to different UE panels may be assumed to have different numbers of SRS ports.

[0109] For example, the first and second SRS resource sets may correspond to the same panel, and the third and fourth SRS resource sets may correspond to another identical panel, or the first and third SRS resource sets may correspond to the same panel, and the second and fourth SRS resource sets may correspond to another identical panel.

[0110] The correspondence between the SRS resource set and the TRP / SRI (SRI field) may be determined in advance by a specification, or may be specified / determined by higher layer signaling, physical layer signaling, UE capability, or a combination thereof.

[0111] Each SRS field may correspond to two SRS resource sets, and the two SRS resource sets may correspond to different UE panels.

[0112] For example, the first SRI field may correspond to the first and second SRS resource sets, the second SRI field may correspond to the third and fourth SRS resource sets, or the first SRI field may correspond to the first and third SRS resource sets, and the second SRI field may correspond to the second and fourth SRS resource sets.

[0113] The number of SRS resource sets may be greater than four. In this case, embodiments 1.2.3 may be applied with modifications based on the number of panels and the number of TRPs. For example, "first and second SRS resource sets" may be replaced with "n SRS resource sets in ascending order (e.g., from a smaller ID)," and "third and fourth SRS resource sets" may be replaced with "n SRS resource sets in ascending order (e.g., from a larger ID)." The "first and third SRS resource sets" may be replaced with "n odd-numbered SRS resource sets (or odd-numbered (or even-numbered) IDs)," and "third and fourth SRS resource sets" may be replaced with "n even-numbered SRS resource sets (or even-numbered (or odd-numbered) IDs)."

[0114] In embodiment 1.2.3, the UE may assume that each of the two SRI fields included in the DCI specifies both an SRS resource set and an SRS resource, as in embodiment 1.1.1. In this case, the UE may assume that the two SRS resources specified by the two SRI fields have the same port number.

[0115] In addition, in Embodiment 1.2.3, the UE may assume that the first SRI field of the two SRI fields included in the DCI specifies both an SRS resource set and an SRS resource, as in Embodiment 1.1.1, in which case the UE may assume that the second SRI field indicates only SRS resources in the SRS resource set specified by the first SRI field, or only SRS resources having the same number of ports as the SRS resources specified by the first SRI field.

[0116] For example, if the first SRI field indicates SRS resources of a first SRS resource set, the UE may determine that the second SRI field indicates SRS resources within the first SRS resource set.

[0117] Furthermore, in Embodiment 1.2.2, the UE may specify one of the UE panels by DCI / MAC CE / RRC or may determine it based on a report from the UE, similar to the aspects in which "SRS resource set" is replaced with "UE panel" in Embodiments 1.1.2 to 1.1.5. The UE may assume that both of the two SRI fields specify SRS resources in an SRS resource set corresponding to the specified / reported UE panel, or may assume that the first SRI field specifies SRS resources in an SRS resource set corresponding to the specified / reported UE panel and the second SRI field specifies SRS resources in an SRS resource set corresponding to a UE panel other than the specified / reported UE panel.

[0118] For example, if the first and second SRS resource sets correspond to the same panel (first panel) and the third and fourth SRS resource sets correspond to another same panel (second panel), and the UE is assigned the first panel, the UE may determine that the first SRI field indicates SRS resources in the first SRS resource set corresponding to the first panel, and the second SRI field indicates SRS resources in the second SRS resource set corresponding to the first panel.

[0119] According to the first embodiment described above, for example, one SRS resource set is considered to correspond to one panel, and CB-based PUSCH transmission for multiple panels can be appropriately controlled using multiple SRS resource sets.

[0120] Second Embodiment Similar to the first embodiment, the second embodiment relates to indication of SRI assuming CB-based PUSCH.

[0121] In the second embodiment, the UE is configured with at least two SRS resource sets. While the SRS resources included in the same SRS resource set have the same number of ports in the first embodiment, in the second embodiment, the SRS resources may have different numbers of ports or the same number of ports.

[0122] 5 is a diagram illustrating an example of SRS resource sets configured in the second embodiment. In this example, two SRS resource sets (SRS resource sets #1 and #2) are configured in a UE. SRS resource set #1 includes an SRS resource with two ports (SRS resource #1) and an SRS resource with four ports (SRS resource #2), while SRS resource set #2 includes an SRS resource with two ports (SRS resource #3) and an SRS resource with four ports (SRS resource #4).

[0123] The second embodiment is roughly divided into embodiment 2.1 for STRP PUSCH and embodiment 2.2 for MTRP PUSCH.

[0124] [Embodiment 2.1] Embodiment 2.1 may be the same as embodiment 1.1. That is, in embodiment 2.1, any one or a combination of embodiments 1.1.1 to 1.1.5 described above may be used as a method for a UE to identify which SRS resource in which SRS resource set is to be used for STRP PUSCH transmission.

[0125] [Embodiment 2.2] Embodiment 2.2 may be the same as embodiment 1.2. That is, in embodiment 2.2, the UE may use any one or a combination of embodiments 1.2.1 to 1.2.3 described above as a method for identifying which SRS resource in which SRS resource set to use for MTRP PUSCH transmission.

[0126] In addition, in embodiment 2.2, the following modifications may be used together with or instead of any one or combination of embodiments 1.2.1 to 1.2.3 described above.

[0127] In a variation of embodiment 2.2, the UE is configured with two SRS resource sets, where the first SRI field corresponds to the first SRS resource set and the second SRI field corresponds to the second SRS resource set.

[0128] Furthermore, if the DCI specifies dynamic switching of the TRP order for MTRP PUSCH transmission, the UE may determine the SRS resource set corresponding to each SRI field based on the specified TRP order. For example, if the order (TRP1, TRP2) is specified, the UE may determine that the first SRI field corresponds to the first SRS resource set and the second SRI field corresponds to the second SRS resource set. For example, if the order (TRP2, TRP1) is specified, the UE may determine that the first SRI field corresponds to the second SRS resource set and the second SRI field corresponds to the first SRS resource set.

[0129] The TRP order may be an order indicating which TRP / SRI field / SRS resource set is applied to each PUSCH repetition, such as cyclic mapping (e.g., TRP1, TRP2, TRP1, TRP2), sequential mapping (e.g., TRP1, TRP1, TRP2, TRP2), half-half mapping, or an explicit order as described above. If the number of TRPs in the specified order is less than the number of repetitions, the order may be repeatedly applied according to any of the above mappings.

[0130] In a variant of embodiment 2.2, the UE may expect that the two SRI fields each specify two SRS resources with the same number of ports (in other words, it may be assumed that the two SRI fields do not specify SRS resources with different numbers of ports).

[0131] In a variation of embodiment 2.2, the UE may assume that the second SRI field indicates only SRS resources that have the same port number as the SRS resource specified by the first SRI field.

[0132] 6A and 6B are diagrams showing an example of an SRS resource set according to a modified example of embodiment 2.2. This example (and FIGS. 7A and 7B) is the same as FIG. 5 except for the number of ports of the SRS resource, and therefore redundant description will not be repeated.

[0133] In a variant of embodiment 2.2, a constraint may be applied that at least one of the two sets of SRS resources from each of the two SRS resource sets has the same number of ports (in other words, the number of ports of at least one SRS resource in the first SRS resource set is the same as the number of ports of at least one SRS resource in the second SRS resource set).

[0134] Under this constraint, the configuration in Fig. 6A is not permitted (because the number of ports corresponding to the SRS resources in the first SRS resource set, i.e., 1 and 2, differs from the number of ports of any SRS resource in the second SRS resource set, i.e., 4), while the configuration in Fig. 6B is permitted (because the number of ports corresponding to the SRS resources in the first SRS resource set, i.e., 2, is the same as the number of ports of any SRS resource in the second SRS resource set, i.e., 2).

[0135] 7A and 7B are diagrams showing another example of an SRS resource set according to a modified example of embodiment 2.2.

[0136] In a variation of embodiment 2.2, if the first SRS resource set has SRS resources with port number=X and SRS resources with port number=Y (X and Y are integers, for example, X≠Y), a constraint may be applied that the second SRS resource set also has SRS resources with port number=X and SRS resources with port number=Y.

[0137] Under this constraint, the configuration of Fig. 7A is not permitted (because the set of 1 and 2 ports corresponding to the SRS resources of the first SRS resource set is different from the set of 2 and 4 ports corresponding to the SRS resources of the second SRS resource set). On the other hand, the configuration of Fig. 7B is permitted (because the set of 2 and 4 ports corresponding to the SRS resources of the first SRS resource set is the same as the set of 2 and 4 ports corresponding to the SRS resources of the second SRS resource set). Note that in Fig. 7B, for example, a case where the number of ports for SRS resource #3 is 4 and the number of ports for SRS resource #4 is 2 may also be permitted.

[0138] According to the second embodiment described above, for example, one SRS resource set is considered to correspond to one panel, and CB-based PUSCH transmission for multiple panels can be appropriately controlled using multiple SRS resource sets.

[0139] Third Embodiment The third embodiment relates to indication of SRI assuming NCB-based PUSCH.

[0140] In the third embodiment, the UE is configured with at least two SRS resource sets, each of which may include a different number of SRS resources.

[0141] 8 is a diagram illustrating an example of SRS resource sets configured in the third embodiment. In this example, two SRS resource sets (SRS resource sets #1 and #2) are configured in a UE. SRS resource set #1 includes two SRS resources (SRS resources #1 and #2), and SRS resource set #2 includes four SRS resources (SRS resources #3, #4, #5, and #6).

[0142] The third embodiment is roughly divided into embodiment 3.1 for STRP PUSCH and embodiment 3.2 for MTRP PUSCH.

[0143] [Embodiment 3.1] Embodiment 3.1 may be the same as embodiment 1.1. That is, in embodiment 3.1, any one of or a combination of embodiments 1.1.1 to 1.1.5 described above may be used as a method for a UE to identify which SRS resource in which SRS resource set is to be used for STRP PUSCH transmission. Note that the term "SRS resource" in these embodiments may be read as "SRS resource or a set of SRS resources."

[0144] For example, in embodiment 3.1.1, which is similar to embodiment 1.1.1, the UE determines both the SRS resource set and the SRS resource based on one SRI field.

[0145] 9 is a diagram illustrating an example of a correspondence relationship between the value of the SRI field and the SRS resource set and SRS resource in embodiment 3.1.1. ｍａｘ This is for SRI indication for non-codebook-based PUSCH transmission when L = 2. ｍａｘThe value of may be set by a higher layer parameter "maxMIMO-Layers" indicating the maximum number of MIMO (Multi-Input Multi-Output) layers, or may be given by the maximum number of PUSCH layers supported by the UE.

[0146] In this example, SRI code points 0 to x (x is an integer, x=2 in FIG. 9) correspond to SRS resources (e.g., SRS resources corresponding to SRI #0 or #1) or pairs of SRS resources (e.g., pairs of two SRS resources corresponding to SRI #{0, 1}) from the first SRS resource set, respectively. Also, SRI code points x+1 to x+1+y (y is an integer, y>4 in FIG. 9) correspond to SRS resources (e.g., SRS resources corresponding to SRI #0, #1, #2, or #3) or pairs of SRS resources (e.g., pairs of two SRS resources corresponding to SRI #{0, 1}) from the second SRS resource set, respectively.

[0147] According to the above-described embodiment 3.1, for example, it is possible to consider that one SRS resource set corresponds to one panel, and appropriately control PUSCH transmission for multiple panels using multiple SRS resource sets.

[0148] [Embodiment 3.2] Embodiment 3.2 may be the same as Embodiment 1.2 / 2.2 (including the modified embodiment of Embodiment 2.2). That is, in Embodiment 3.2, the UE may use any of the methods of Embodiment 1.2 / Embodiment 2.2 (including the modified embodiment of Embodiment 2.2) or a combination thereof as a method for identifying which SRS resource in which SRS resource set to use for MTRP PUSCH transmission.

[0149] In addition, in embodiment 3.2, the UE may expect that the two SRI fields each specify the same number of SRS resources (combinations). In other words, the UE may assume that the second SRI field indicates only the same number of SRS resources (combinations) as the number of SRS resources (combinations) specified by the first SRI field.

[0150] For example, if the value of the first SRI field indicates a set of two SRS resources in a first SRS resource set, the value of the second SRI field may indicate a set of two SRS resources in a second SRS resource set.

[0151] According to the third embodiment described above, for example, it is possible to consider that one SRS resource set corresponds to one panel, and appropriately control NCB-based PUSCH transmission for multiple panels using multiple SRS resource sets.

[0152] <Others> At least one of the above-described embodiments may be applied only to UEs that have reported a specific UE capability or that support the specific UE capability.

[0153] The specific UE capability may indicate at least one of the following: - whether it supports (operation of) multiple UE panels; - whether it supports different SRS resources with different numbers of SRS ports in different SRS resource sets; - whether it supports different SRS resources with different numbers of SRS ports in the same SRS resource set; - whether it supports multi-TRP PUSCH / PUSCH repetition; - whether it supports multi-TRP PUSCH / PUSCH repetition and (operation of) multiple UE panels.

[0154] Note that the specific UE capability may be a capability for CB-based PUSCH, a capability for NCB-based PUSCH, or a capability that does not distinguish between these.

[0155] Furthermore, at least one of the above-described embodiments may be applied when specific information related to the above-described embodiments is configured in the UE by higher layer signaling (if not configured, for example, the operation of Rel. 15 / 16 applies). For example, the specific information may be information indicating enabling PUSCH repetition for multi-TRP, information indicating enabling (the operation of) multiple UE panels, configuration information for multiple SRS resource sets for specific uses (e.g., CB / NCB), any RRC parameter for a specific release (e.g., Rel. 17), etc. Furthermore, the UE may be configured using higher layer parameters to determine based on which of the above-described embodiments / cases / conditions PHR control is to be performed.

[0156] The above-described embodiment may be applied to a case where PUSCH repetition type A / type B is used.

[0157] It should be noted that the above-described embodiments may be applied when a specific mapping pattern of MTRP repetition (cyclical, sequential, half-half, etc.) is used.

[0158] (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.

[0159] 10 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).

[0160] 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.

[0161] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (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.

[0162] 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 SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0163] 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.

[0164] 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 (CCs) and dual connectivity (DC).

[0165] 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 higher than 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.

[0166] 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.

[0167] The multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with the Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0168] 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.

[0169] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0170] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the wireless 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).

[0171] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (e.g., other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0172] 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.

[0173] 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)), or the like may be used as an uplink channel.

[0174] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0175] 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.

[0176] 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 a UL grant, a UL DCI, etc. Note that the PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

[0177] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources for searching 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 the CORESET associated with a certain search space based on the search space configuration.

[0178] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the terms "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," "CORESET configuration," and the like in the present disclosure may be read interchangeably.

[0179] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation 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.

[0180] 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.

[0181] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0182] 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 an SS (PSS, SSS) and a PBCH (and a 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 a reference signal.

[0183] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), or the like 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).

[0184] 11 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.

[0185] 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.

[0186] 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.

[0187] 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, control information, sequences, etc. to be transmitted as signals, 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.

[0188] 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.

[0189] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, the RF unit 122, and a measurement unit 123.

[0190] 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 relates, such as an array antenna.

[0191] 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.

[0192] The transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0193] The transmitter / receiver unit 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.

[0194] The transmitter / receiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0195] The transceiver unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.

[0196] 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 130.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] 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.

[0201] In addition, the transceiver unit 120 may transmit downlink control information (DCI / S-DCI) including a first sounding reference signal (SRS) resource indicator (SRI) field and a second SRI field to the user terminal 20.

[0202] The transceiver unit 120 may receive a codebook-based or non-codebook-based uplink transmission (e.g., a PUSCH) scheduled by the downlink control information, which is transmitted by the terminal using a first panel determined based on the first SRI field and a second panel determined based on the second SRI field.

[0203] (User Terminal) Fig. 12 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.

[0204] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, 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.

[0205] 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, etc., which are described based on common understanding in the technical field to which the present disclosure relates.

[0206] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may 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.

[0207] 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 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.

[0208] 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.

[0209] The transmitting / receiving antenna 230 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure relates, such as an array antenna.

[0210] 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.

[0211] The transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0212] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0213] The transmitter / receiver unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0214] 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 if not, it may not be necessary to perform DFT processing as the transmission processing.

[0215] The transceiver unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.

[0216] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.

[0217] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0218] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0219] Note that the transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

[0220] In addition, the transceiver unit 220 may receive downlink control information (DCI) including a first sounding reference signal (SRS) resource indicator (SRI) field and a second SRI field.

[0221] The control unit 210 may control a codebook-based or non-codebook-based uplink transmission (e.g., a CB / NCB PUSCH for STRP / MTRP) scheduled by the downlink control information to be performed using a first panel determined based on the first SRI field and a second panel determined based on the second SRI field.

[0222] The control unit 210 may determine the first panel based on a first SRS resource set corresponding to the SRS resources specified by the first SRI field.

[0223] The controller 210 may assume that the second SRI field indicates an SRS resource in the first SRS resource set.

[0224] (Hardware Configuration) Note that 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 be realized by combining software with the single device or the multiple devices.

[0225] 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 described above, the implementation method of each is not particularly limited.

[0226] For example, a base station, a user terminal, or the like 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. 13 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, and the like.

[0227] In the present disclosure, the terms apparatus, circuit, device, section, unit, etc. may be used 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.

[0228] 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.

[0229] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading specified 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.

[0230] 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), transceiver unit 120 (220), etc. may be realized by the processor 1001.

[0231] 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 implemented by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be implemented in a similar manner.

[0232] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EEPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory, etc. The memory 1002 may store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.

[0233] Storage 1003 is a computer-readable recording medium and may be composed of 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, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0234] 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.

[0235] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0236] 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.

[0237] 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 this hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0238] (Modifications) Note that terms described 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.

[0239] 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.

[0240] 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, Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by a transceiver in the frequency domain, and specific windowing performed by a transceiver in the time domain.

[0241] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may also be a time unit based on numerology.

[0242] 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.

[0243] 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.

[0244] 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 the subframe and the 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.

[0245] 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. Note that the definition of TTI is not limited to this.

[0246] 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.

[0247] 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.

[0248] 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.

[0249] 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 greater than or equal to 1 ms.

[0250] 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 be determined based on numerology.

[0251] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may be composed of one or more resource blocks.

[0252] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0253] 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.

[0254] A Bandwidth Part (BWP), which may also be referred to as a partial 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 BWP and numbered within the BWP.

[0255] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0256] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given channel / signal outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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.

[0262] 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.

[0263] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0264] Note that the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be referred to as 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).

[0265] 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).

[0266] 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).

[0267] 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.

[0268] 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), these wired and / or wireless technologies are included within the definition of transmission media.

[0269] 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).

[0270] 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.

[0271] In the present disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0272] 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 partitioned 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 terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication service within that coverage.

[0273] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0274] 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.

[0275] At least one of the base station and the mobile station may be referred to as 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 body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may 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.

[0276] 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.

[0277] 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.

[0278] 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), a Serving-Gateway (S-GW), etc.), or a combination thereof.

[0279] 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 particular order presented.

[0280] Each aspect / embodiment described in the present disclosure may be a technology other than 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 decimal number)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on these and are extended thereto. In addition, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0281] 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."

[0282] 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.

[0283] 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.

[0284] 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.

[0285] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "deciding" some action.

[0286] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0287] 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."

[0288] 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.

[0289] 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."

[0290] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0291] 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.

[0292] 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.

[0293] This application is based on Japanese Patent Application No. 2021-86491, filed on May 21, 2021, the entire contents of which are incorporated herein by reference.

Claims

1. A receiving unit that receives downlink control information for scheduling the uplink shared channel, the downlink control information including a first sounding reference signal (SRS) resource indicator (SRI) field and a second SRI field, and specifying an order of SRS resource sets applied to each transmission of the codebook-based uplink shared channel; A terminal comprising: a control unit that determines an SRS resource set applied to each transmission of the uplink shared channel based on the order from a first SRS resource set corresponding to the first SRI field and a second SRS resource set corresponding to the second SRI field, and performs control to transmit the uplink shared channel.

2. The terminal according to claim 1, wherein the control unit expects that the first SRI field and the second SRI field specify SRS resources having the same number of ports.

3. The terminal according to claim 1 or 2, wherein the control unit repeatedly applies the SRS resource set in the order to each transmission of the uplink shared channel when the number of SRS resource sets in the order is less than the number of repetitions.

4. The terminal according to any one of claims 1 to 3, wherein when full power mode 2 is set in the terminal, SRS resources included in the same SRS resource set have different numbers of ports.

5. The terminal according to any one of claims 1 to 4, wherein the control unit performs control to perform a transmission to which the first SRS resource set is applied using a first panel and perform a transmission to which the second SRS resource set is applied using a second panel.

6. Receiving downlink control information for scheduling the uplink shared channel, the downlink control information including a first sounding reference signal (SRS) resource indicator (SRI) field and a second SRI field, and specifying an order of SRS resource sets applied to each transmission of the codebook-based uplink shared channel; A wireless communication method for a terminal, comprising: determining, based on the order, an SRS resource set applied to each transmission of the uplink shared channel from a first SRS resource set corresponding to the first SRI field and a second SRS resource set corresponding to the second SRI field; and performing control to transmit the uplink shared channel.

7. A transmission unit that transmits, to a terminal, downlink control information for scheduling the uplink shared channel, the downlink control information including a first measurement reference signal (Sounding Reference Signal (SRS)) resource indicator (SRS Resource Indicator (SRI)) field and a second SRI field and specifying an order of SRS resource sets applied to each transmission of a codebook-based uplink shared channel. A base station, comprising: a receiving unit that receives the uplink shared channel, wherein an SRS resource set applied to each transmission of the uplink shared channel is determined and transmitted by the terminal based on the order from a first SRS resource set corresponding to the first SRI field and a second SRS resource set corresponding to the second SRI field.

8. A system including the terminal according to any one of Claims 1 to 5 and the base station according to Claim 7.