Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit that receives a measurement reference signal (SRS) resource setting for uplink (UL) transmission using three antenna ports (3 Tx); and a control unit that, on the basis of the type of SRS resource to be set and the number of SRS ports to be supported, controls the division of SRS transmission power or the scaling of physical uplink shared channel (PUSCH) transmission power.

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 (registered trademark)) 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] Rel. 15 NR supports uplink (UL) multi-input multi-output (MIMO) transmission with up to four layers. For future NRs, support for UL transmission with a number of layers greater than four is being considered to achieve higher spectral efficiency. For example, for Rel. 18 NR, maximum 6-rank transmission using 6 antenna ports and maximum 6- or 8-rank transmission using 8 antenna ports are being considered.

[0006] On the other hand, there may be cases where uplink full power transmission is not supported in Rel. 19 and later. In such cases, to easily realize codebook-based transmission using three antenna ports (3-antenna-port codebook-based transmission), it is being considered to specify a noncoherent UL codebook (a noncoherent codebook for UL).

[0007] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately control UL transmission using, for example, three antenna ports.

[0008] A terminal according to one aspect of the present disclosure includes a receiving unit that receives measurement reference signal (SRS) resource configuration for uplink (UL) transmission using three antenna ports (3Tx), and a control unit that controls division of SRS transmission power or scaling of physical uplink shared channel (PUSCH) transmission power based on the type of SRS resource to be configured and the number of supported SRS ports.

[0009] According to one aspect of the present disclosure, UL transmission can be appropriately controlled.

[0010] Figure 1 is a diagram showing an example of a table of precoding matrices W for single-layer (rank-1) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 2 is a diagram showing an example of a table of precoding matrices W for two-layer (rank-2) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 3 is a diagram showing an example of a table of precoding matrices W for three-layer (rank-3) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 4 is a diagram showing an example of a table of precoding matrices W for four-layer (rank-4) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 5A is a diagram showing an example of a table of precoding matrices W for single-layer (rank-1) transmission using two antenna ports in Rel. 16 NR. Figure 5B is a diagram showing an example of a table of precoding matrices W for two-layer (rank-1) transmission using two antenna ports in Rel. 16 NR.

[0033] Figure 6 is a diagram showing an example of a table of precoding matrix W for two-layer (rank-2) transmission using two antenna ports when transform precoding is disabled in Rel. 16 NR. Figure 6 is a diagram showing an example of a correspondence between field values ​​for precoding information and number of layers and the number of layers and TPMI in Rel. 16 NR. Figures 7A to 7C are diagrams showing an SRI indication or a second SRI indication during codebook-based PUSCH transmission in Rel. 17. Figure 8 is a diagram showing an example of an antenna layout for eight antenna ports. Figures 9A to 9D are conceptual diagrams showing correspondence between resource sets and resources (patterns 1 to 4) in a codebook for a 3-Tx UE. Figure 10 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. Figure 11 is a diagram showing an example of a configuration of a base station according to an embodiment. Figure 12 is a diagram showing an example of a configuration of a user terminal according to an embodiment. Figure 13 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. Figure 14 is a diagram showing an example of a vehicle according to an embodiment.

[0011] (Control of Transmission of SRS and PUSCH) In Rel. 15 NR, a terminal (user terminal, User Equipment (UE)) may receive information (SRS configuration information, for example, parameters in the RRC control element "SRS-Config") used for transmitting a measurement reference signal (for example, a sounding reference signal (SRS)).

[0012] 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").

[0013] An SRS resource set may be associated with (or group together) a predetermined number of SRS resources, each of which may be identified by an SRS Resource Indicator (SRI) or SRS Resource Identifier (ID).

[0014] The SRS resource set information may include an SRS resource set ID (SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, an SRS resource type, and information on SRS usage.

[0015] 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.

[0016] Furthermore, the use ("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 or non-codebook use may be used to determine a precoder for codebook-based or non-codebook-based uplink shared channel (Physical Uplink Shared Channel (PUSCH)) transmission based on the SRI.

[0017] For example, in the case of codebook-based transmission, the UE may determine a precoder (precoding matrix) for PUSCH transmission based on the SRI, a Transmitted Rank Indicator (TRI), and a Transmitted Precoding Matrix Indicator (TPMI). In the case of non-codebook-based transmission, the UE may determine a precoder for PUSCH transmission based on the SRI.

[0018] 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.

[0019] 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).

[0020] 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.

[0021] 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.

[0022] 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.

[0023] When the UE is configured with spatial relationship information regarding the 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.

[0024] 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.

[0025] 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.

[0026] In Rel. 15 / 16 NR, when codebook-based transmission is used for PUSCH, the UE is configured by RRC with an SRS resource set of a codebook usage having up to two SRS resources, and one of the up to two SRS resources may be indicated by DCI (a 1-bit SRI field). The transmission beam for PUSCH is specified by the SRI field.

[0027] The UE may determine the TPMI and the number of layers (transmission rank) for the PUSCH based on the precoding information and number of layers field (hereinafter also referred to as the precoding information field). The UE may select a precoder from an uplink codebook for the same number of SRS ports as the number of SRS ports indicated by the upper layer parameter "nrofSRS-Ports" configured for the SRS resource specified by the SRI field based on the TPMI, the number of layers, etc.

[0028] In Rel. 15 / 16 NR, when non-codebook-based transmission is used for PUSCH, a non-codebook-used SRS resource set having up to four SRS resources may be configured for the UE by RRC, and one or more of the up to four SRS resources may be indicated by DCI (a 2-bit SRI field).

[0029] The UE may determine the number of layers (transmission rank) for the PUSCH based on the SRI field. For example, the UE may determine that the number of SRS resources specified by the SRI field is the same as the number of layers for the PUSCH. The UE may also calculate a precoder for the SRS resources.

[0030] If a CSI-RS (which may be referred to as an associated CSI-RS) associated with the SRS resource (or an SRS resource set to which the SRS resource belongs) is configured by a higher layer, the transmission beam for the PUSCH may be calculated based on (measurements of) the configured associated CSI-RS. Otherwise, the transmission beam for the PUSCH may be specified by the SRI.

[0031] The UE may be configured to use codebook-based PUSCH transmission or non-codebook-based PUSCH transmission by a higher layer parameter "txConfig" indicating a transmission scheme. The parameter may indicate a value of "codebook" or "non-codebook."

[0032] In the present disclosure, a codebook-based PUSCH (codebook-based PUSCH transmission, codebook-based transmission) may refer to a PUSCH when a UE is configured with "codebook" as a transmission scheme. In the present disclosure, a non-codebook-based PUSCH (non-codebook-based PUSCH transmission, non-codebook-based transmission) may refer to a PUSCH when a UE is configured with "non-codebook" as a transmission scheme.

[0033] (Determining a PUSCH Precoder in Codebook (CB)-Based Transmission) As described above, in the case of codebook (CB)-based transmission, the UE may determine a precoder for PUSCH transmission based on the SRI, TRI, TPMI, and the like.

[0034] The SRI, TRI, TPMI, etc. may be notified to the UE using Downlink Control Information (DCI). The SRI may be specified by an SRS Resource Indicator field (SRI field) of the DCI, or may be specified by a parameter "srs-ResourceIndicator" included in an RRC information element "ConfiguredGrantConfig" of a configured grant PUSCH.

[0035] The TRI and TPMI may be specified by a "Precoding information and number of layers" field of the DCI, which for simplicity is also referred to as the Precoding information field.

[0036] The UE may report UE capability information related to a precoder type, and the base station may configure the precoder type based on the UE capability information through higher layer signaling. The UE capability information may be information on the precoder type used by the UE in PUSCH transmission (for example, may be represented by the RRC parameter "pusch-TransCoherence").

[0037] The UE may determine the precoder to be used for PUSCH transmission based on precoder type information (e.g., the RRC parameter "codebookSubset") included in PUSCH configuration information notified by higher layer signaling (e.g., the "PUSCH-Config" information element of RRC signaling). The UE may be configured with a subset of the PMI specified by the TPMI by the codebookSubset.

[0038] The precoder type may be specified by any one of full coherent, partial coherent, and non-coherent, or a combination of at least two of these (for example, it may be expressed by parameters such as "fully and partial and non-coherent" or "partial and non-coherent").

[0039] For example, the RRC parameter "pusch-TransCoherence" indicating UE capability may indicate full coherence, partial coherence, or noncoherence, and the RRC parameter "codebookSubset" may indicate "fully and partial and noncoherence," "partial and noncoherence," or "noncoherent."

[0040] Fully coherent may mean that all antenna ports used for transmission are synchronized (may be expressed as being able to match the phase, being able to control the phase for each coherent antenna port, being able to apply a precoder appropriately for each coherent antenna port, etc.). Partially coherent may mean that some of the antenna ports used for transmission are synchronized, but those some ports cannot be synchronized with other ports. Non-coherent may mean that each antenna port used for transmission cannot be synchronized.

[0041] Note that a UE that supports a fully coherent precoder type may be assumed to support partially coherent and non-coherent precoder types, and a UE that supports a partially coherent precoder type may be assumed to support a non-coherent precoder type.

[0042] In the present disclosure, precoder type, coherency, PUSCH transmission coherence, coherent type, coherence type, codebook type, codebook subset, codebook subset type, etc. may be read interchangeably.

[0043] The UE may determine, from multiple precoders (which may also be called precoding matrices, codebooks, etc.) for CB-based transmission, a precoding matrix corresponding to a TPMI index obtained from a DCI (e.g., DCI format 0_1, etc.) that schedules an UL transmission.

[0044] Figure 1 shows an example of the association between codebook subsets and TPMI indices. Figure 1 corresponds to a table of precoding matrices W for single-layer (rank-1) transmission using four antenna ports when transform precoding (also called a transform precoder) is disabled in Rel. 16 NR. Figure 1 shows the corresponding Ws in ascending order of TPMI indices from left to right (similar to Figure 2).

[0045] The correspondence relationship (which may be called a table) showing the TPMI index and the corresponding W as shown in Fig. 1 is also called a codebook. A part of this codebook is also called a codebook subset.

[0046] In Fig. 1, if the codebook subset is fully, partially, and non-coherent, the UE is notified of a TPMI (TPMI index) of 0 to 27 for single-layer transmission. If the codebook subset is partial and non-coherent, the UE is configured with a TPMI of 0 to 11 for single-layer transmission. If the codebook subset is non-coherent, the UE is configured with a TPMI of 0 to 3 for single-layer transmission.

[0047] In Fig. 1, when a TPMI of 0 to 3 is notified, a non-coherent precoder is applied. When a TPMI of 4 to 11 is notified, a partially coherent precoder is applied. When a TPMI of 12 to 27 is notified, a fully coherent precoder is applied.

[0048] 2 to 4 correspond to tables of precoding matrices W for 2-4 layer (rank 2-4) transmission using 4 antenna ports in Rel. 16 NR when transform precoding is disabled.

[0049] According to Figure 2, the TPMI that the UE is informed of for two-layer transmission is from 0 to 21 (codebook subset full, partial and non-coherent), from 0 to 13 (codebook subset partial and non-coherent) or from 0 to 5 (codebook subset non-coherent).

[0050] According to Figure 3, the TPMI that the UE is informed of for layer 3 transmission is 0 to 6 (codebook subset full, partial and non-coherent), 0 to 2 (codebook subset partial and non-coherent) or 0 (codebook subset non-coherent).

[0051] According to Figure 4, the TPMI that the UE is informed of for four-layer transmission is between 0 and 4 (codebook subset is full, partial and non-coherent), between 0 and 2 (codebook subset is partial and non-coherent) or 0 (codebook subset is non-coherent).

[0052] Figure 5A corresponds to a table of precoding matrices W for single-layer (rank-1) transmission using two antenna ports in Rel. 16 NR. Figure 5B corresponds to a table of precoding matrices W for two-layer (rank-2) transmission using two antenna ports in Rel. 16 NR when transform precoding is disabled.

[0053] According to Figure 5A, the TPMI signaled to the UE for two-port single layer transmission is between 0 and 5 (codebook subsets are full, partial, and non-coherent) or between 0 and 1 (codebook subset is non-coherent). If the signaled TPMI is between 0 and 1, a non-coherent precoder is applied. If the signaled TPMI is between 2 and 5, a fully coherent precoder is applied.

[0054] According to FIG. 5B, the TPMI that the UE is informed of for two-port two-layer transmission is between 0 and 2 (codebook subset complete, partial and non-coherent) or 0 (codebook subset non-coherent).

[0055] Note that a precoding matrix in which only one element per column is non-zero may be called a non-coherent codebook. A precoding matrix in which a certain number of elements per column (greater than one, but not all elements in the column) are non-zero may be called a partially coherent codebook. A precoding matrix in which all elements per column are non-zero may be called a fully coherent codebook.

[0056] The non-coherent codebook and the partially coherent codebook may be referred to as an antenna selection precoder, an antenna port selection precoder, etc. For example, the non-coherent codebook (non-coherent precoder) may be referred to as a 1-port selection precoder, a 1-port port selection precoder, etc. Furthermore, the partially coherent codebook (partially coherent precoder) may be referred to as an x-port (x is an integer greater than 1) selection precoder, an x-port port selection precoder, etc. The fully coherent codebook may be referred to as a non-antenna selection precoder, a full-port precoder, etc. In the present disclosure, the terms codebook, codebook subset, and precoder may be interchangeable.

[0057] In the present disclosure, a partially coherent codebook may correspond to a codebook (precoding matrix) corresponding to a TPMI specified by DCI for codebook-based transmission by a UE configured with a partially coherent codebook subset (e.g., RRC parameter “codebookSubset”=“partialAndNonCoherent”), excluding a codebook corresponding to a TPMI specified by DCI for a UE configured with a non-coherent codebook subset (e.g., RRC parameter “codebookSubset”=“nonCoherent”) (i.e., in the case of single-layer transmission with four antenna ports, a codebook with TPMI=4 to 11).

[0058] In the present disclosure, a fully coherent codebook may correspond to a codebook (precoding matrix) corresponding to a TPMI specified by DCI for codebook-based transmission by a UE configured with a fully coherent codebook subset (e.g., RRC parameter “codebookSubset”=“fullyAndPartialAndNonCoherent”), excluding a codebook corresponding to a TPMI specified by DCI for a UE configured with a partially coherent codebook subset (e.g., RRC parameter “codebookSubset”=“partialAndNonCoherent”) (i.e., in the case of single-layer transmission with four antenna ports, a codebook with TPMI=12 to 27).

[0059] As can be seen from Figures 5A and 5B, there is no partially coherent precoder for two-antenna port transmission, so the setting in which the codebook subset is partial and non-coherent does not need to be applied to two-antenna ports.

[0060] (Precoding Information Field) As described above, the UE may determine the TPMI and the number of layers (transmission rank) for a PUSCH based on the precoding information field of the DCI (e.g., DCI format 0_1 / 0_2) that schedules the PUSCH.

[0061] For a codebook-based PUSCH, the number of bits of the precoding information field may be determined (or may vary) based on the setting of whether to enable or disable the transform precoder for the PUSCH (e.g., the upper layer parameter transformPrecoder), the setting of the codebook subset for the PUSCH (e.g., the upper layer parameter codebookSubset), the setting of the maximum number of layers for the PUSCH (e.g., the upper layer parameter maxRank), the setting of uplink full power transmission for the PUSCH (e.g., the upper layer parameter ul-FullPowerTransmission), the number of antenna ports for the PUSCH, etc.

[0062] 6 is a diagram showing an example of the correspondence between the field values ​​of the precoding information and the number of layers and the number of layers and the TPMI in Rel. 16 NR. The correspondence in this example is for four antenna ports when the transform precoder is disabled, the maximum rank (maxRank) is set to 2, 3, or 4, and uplink full power transmission is not set, is set to full power mode 2 (fullpowerMode2), or is set to full power, but is not limited to this. It should be understood by those skilled in the art that the "bit field mapped to the index" shown in the figure indicates the field values ​​of the precoding information and the number of layers.

[0063] In FIG. 6, the precoding information field is 6 bits when a fully coherent (fullyAndPartialAndNonCoherent) codebook subset is configured in the UE, 5 bits when a partially coherent (partialAndNonCoherent) codebook subset is configured, and 4 bits when a noncoherent (nonCoherent) codebook subset is configured.

[0064] As shown in Figure 6, the number of layers and TPMI corresponding to a certain precoding information field value may be the same (common) regardless of the codebook subset configured in the UE. For example, in Figure 6, the number of layers and TPMI indicated by values ​​= 0-11 in the precoding information field may be the same for fully coherent (fullyAndPartialAndNonCoherent), partially coherent (partialAndNonCoherent), and noncoherent codebook subsets. Also, in Figure 6, the number of layers and TPMI indicated by values ​​= 0-31 in the precoding information field may be the same for fully coherent (fullyAndPartialAndNonCoherent) and partially coherent (partialAndNonCoherent) codebook subsets.

[0065] The precoding information field may be 0 bits for a non-codebook-based PUSCH, and may be 0 bits for a codebook-based PUSCH with one antenna port.

[0066] (SRS configuration for codebook-based PUSCH) Fig. 7A shows the SRS configuration in Rel. 17 when ul-FullPowerTransmission is not set, or ul-FullPowerTransmission = fullpowerMode1, or ul-FullPowerTransmission = fullpowerMode2, or ul-FullPowerTransmission = fullpower and N SRS 7B is a diagram showing an SRI indication or a second SRI indication when transmitting a codebook-based PUSCH when ul-FullPowerTransmission=fullpowerMode2 and N SRS 7C is a diagram showing an SRI indication or a second SRI indication for codebook-based PUSCH transmission when ul-FullPowerTransmission=fullpowerMode2 and N SRS 10 shows an SRI indication or a second SRI indication for codebook-based PUSCH transmission when .SIGMA.=4.

[0067] The SRI indication corresponds to the SRS resource indicator field of the DCI, and the second SRI indication corresponds to the Second SRS resource indicator field of the DCI. The SRS resource set indicator field is 2 bits when txConfig=nonCodeBook and there are two SRS resource sets configured by srs-ResourceSetToAddModList associated with the "nonCodeBook" usage, or when txConfig=codebook and there are two SRS resource sets configured by srs-ResourceSetToAddModList associated with the "codebook" usage. Otherwise, the SRS resource set indicator field is 0 bit.

[0068] When the upper layer parameter txConfig=codebook, the SRS resource indicator field is set to [log2(N SRS )] bits. SRS is the number of configured SRS resources in the SRS resource set indicated by the SRS resource set indicator field (if present); otherwise, N SRS is the number of configured SRS resources associated with the usage of the upper parameter of value 'codeBook' within the SRS resource set configured by the upper layer parameter srs-ResourceSetToAddModList.

[0069] In codebook-based transmission, the PUSCH is scheduled by DCI format 0_0, DCI format 0_1, DCI format 0_2, or is semi-statically configured. Only one or two SRS resource sets can be configured in SRS-ResourceSetToAddModList with the higher layer parameter use "codebook" of SRS-ResourceSet. Also, only one or two SRS resource sets can be configured in srs-ResourceSetToAddModListDCI-0-2 with the higher layer parameter use "codebook" of SRS-ResourceSet.

[0070] In srs-ResourceSetToAddModList or srs-ResourceSetToAddModListDCI-0-2, when the usage of the upper layer parameters of SRS-ResourceSet is set to "codebook" and two SRS resource sets are configured, one or two SRIs and one or two TPMIs are given by two SRS resource indication fields and two precoding information fields, respectively.

[0071] The UE applies the indicated SRI(s) and TPMI(s) to one or more PUSCH repetitions according to the associated SRS resource sets of the PUSCH repetitions. If two SRS resource sets are configured in SRS-ResourceSetToAddModList or srs-ResourceSetToAddModListDCI-0-2 and the usage of the higher layer parameters of SRS-ResourceSet is set to "codebook", the UE does not expect different numbers of SRS resources to be configured in the two SRS resource sets.

[0072] For codebook-based transmission, only one SRS resource from the SRS resource set may be indicated based on the SRI. The maximum number of configured SRS resources for codebook-based transmission is two, except when the upper layer parameter "ul-FullPowerTransmission" is set to "fullpowerMode2". If aperiodic SRS is configured for the UE, the SRS request field in the DCI triggers the transmission of the aperiodic SRS resource.

[0073] Except when the higher layer parameter "ul-FullPowerTransmission" is set to "fullpowerMode2", if multiple SRS resources are configured to "codebook" by an SRS-ResourceSet, the UE expects the higher layer parameter "nrofSRS-Port" of the SRS-Resource in the SRS-ResourceSet to be set to the same value for all these SRS resources.

[0074] When the upper layer parameter "ul-FullPowerTransmission" is set to "fullpowerMode2", the following (1) to (3) apply: (1) A UE can configure one SRS resource or multiple SRS resources with the same or different number of SRS ports in an SRS resource set whose purpose is set to "codebook". (2) If multiple SRS resources are configured in an SRS resource set, up to two different spatial relationships can be configured for all SRS resources in an SRS resource set whose purpose is set to "codebook". (3) Depending on the UE capability, up to two or four SRS resources are supported in an SRS resource set whose purpose is set to "codebook".

[0075] In the case of a normal codebook-based PUSCH, one SRS resource set having two SRS resources with the same number of ports can be configured. In the case of codebook-based PUSCH repetition (for multiple Transmission / Reception Points (TRPs)), two SRS resource sets each having the same number of SRS resources can be configured. In the case of "fullpowerMode2" in the codebook base, one SRS resource set, SRS resources with the same number of ports or different numbers of ports can be configured.

[0076] (Transmission of More Than Four Antenna Ports) Rel. 15 / 16 NR supports uplink (UL) multi-input multi-output (MIMO) transmission with up to four layers. For future wireless communication systems, support for UL transmission with more than four layers is being considered to achieve higher spectral efficiency. For example, for Rel. 18 NR, maximum six-rank transmission using six antenna ports and maximum six- or eight-rank transmission using eight antenna ports are being considered.

[0077] 8 is a diagram showing an example of an antenna layout with eight antenna ports. Ng is the number of antenna groups. M is the number of antennas (or antenna elements) in the first dimension, and N is the number of antennas (or antenna elements) in the second dimension. The first and second dimensions are, for example, horizontal and vertical directions. P is the number of polarization planes. When P=2, it becomes a cross-polarized antenna.

[0078] An antenna group may be referred to as a coherent group. A coherent group may include one or more coherent ports. For example, a partially coherent UE may have multiple coherent groups. Antenna ports within a coherent group may be coherent. Antenna ports between different coherent groups may not be coherent.

[0079] Each coherent group may correspond to a different transmit panel / transmit chain / SRS resource set / RS resource set / spatial relation information / joint Transmission Configuration Indication state (joint TCI state) / UL TCI state / received TRP. Here, the SRS resource set may specifically correspond to an SRS resource set used for codebook or non-codebook. Also, each coherent group may correspond to a different received TRP. Also, the coherent group may be referred to as a coherent antenna group, a port group, an antenna set, etc.

[0080] The UE may report supported antenna groups / antenna configuration information / coherent number as UE capability information. Also, the UE may be configured with coherent groups (e.g., the number of coherent groups and the number of ports included in each coherent group) by higher layer signaling.

[0081] It should be noted that the antenna layout is not limited to the example shown in Figure 8. For example, the number of panels on which antennas are arranged, the orientation of the panels, the coherency of each panel / antenna (fully coherent, partially coherent, non-coherent, etc.), the antenna arrangement in a specific direction (horizontal, vertical, etc.), and the polarization antenna configuration (single polarization, cross polarization, number of polarization planes, etc.) may be different from the examples in Figures 7A and 7B. dG-H and dG-V represent the horizontal and vertical spacings between the centers of adjacent antenna groups, respectively.

[0082] In addition, while Rel. 15 / 16 NR supported the transmission of one codeword (CW) in one PUSCH, for Rel. 18 NR, the UE is considering transmitting more than one CW in one PUSCH. For example, support for two CW transmissions for ranks 5-8 and two CW transmissions for ranks 2-8 is being considered.

[0083] In addition, while Rel. 15 and Rel. 16 UEs are expected to use only one beam / panel for UL transmission at a given time, in Rel. 17 and later, simultaneous UL transmission (e.g., PUSCH transmission) of multiple beams / panels for one or more TRPs is being considered to improve UL throughput and reliability. Note that simultaneous PUSCH transmission of multiple beams / panels may correspond to PUSCH transmission with more than four layers or PUSCH transmission with four or fewer layers.

[0084] Also, precoding matrices for UL transmission using more than four antenna ports (a number of antenna ports greater than four) are being considered, for example, a codebook for 8-port transmission (which may be called an 8 TX UL codebook, etc.).

[0085] (SRS Resource Configuration for Codebook-Based PUSCH Transmission) For example, in a single-TRP transmission in Rel. 18, one SRS resource set whose usage is set to codebook can be configured. Except for full power mode 2, two SRS resources can be configured in the SRS resource set (per SRS resource set).

[0086] In multi-TRP transmission, two SRS resource sets whose usage is set to codebook can be configured. Except for full power mode 2, two SRS resources can be configured in each SRS resource set (per SRS resource).

[0087] If multiple SRS resources are configured for an SRS resource set, the precoder for codebook-based transmission corresponds to the SRS resource selected by the SRI field.

[0088] If a single SRS resource is configured for an SRS resource set (not including the SRI field), the precoder for codebook-based transmission corresponds to that SRS resource.

[0089] In a single-TRP transmission, one SRI field is indicated in the DCI. In a multi-TRP transmission, two SRI fields are indicated in the DCI.

[0090] Here, the number of bits in the SRI field is ceil(log ２ (N ＳＲＳ )) is expressed as N ＳＲＳ is the number of SRS resources in (included in) the SRS resource set. Note that in the present disclosure, ceil(X) may mean multiplying X by a ceiling function.

[0091] For example, in DCI format 0_2, N ＳＲＳ，０＿２ Suppose that SRS resources are configured, the SRS resource set for DCI format 0_2 is the first N of the SRS resource sets configured for DCI format 0_1. ＳＲＳ，０＿２ SRS resources are configured (including).

[0092] As a table of SRI indication for codebook-based PUSCH transmission in the existing specifications, for example, refer to Fig. 7A described above. In Fig. 7A, when UL full power transmission (ul-FullPowerTransmission) is not set, when full power mode 2 is set (ul-FullPowerTransmission = fullpowerMode2), or when UL full power transmission (ul-FullPowerTransmission = fullpower) is set and N ＳＲＳ This shows the case where .times. ...

[0093] However, in Rel. 19 and later, there may be cases where the above-mentioned uplink (UL) full power transmission is not supported and SRS enhancement / extension is not performed. In such cases, to easily realize codebook-based transmission using three antenna ports, it is being considered to specify a noncoherent UL codebook (a noncoherent codebook for UL).

[0094] Thus, a new codebook for 3Tx UEs is being studied. In the new codebook-based PUSCH for 3Tx UEs (including, for example, a configuration grant (CG) PUSCH and a dynamic grant (DG) PUSCH), up to two SRS resources (i.e., one or two SRS resources using three antenna ports) can be configured for one SRS resource set.

[0095] For example, existing specifications do not support SRS using three antenna ports (which may be referred to as 3-port SRS), nor do they support enhancements / extensions of the SRS. Therefore, for codebook-based three-layer transmission (3Tx for usage='codebook'), the SRS configurations shown in the following options may be considered. That is, the UE may control SRS transmission according to at least one of the following options:

[0096] [Option 1] Up to two (i.e., one or two) SRS resources (SRS resources using four antenna ports) may be configured for one SRS resource set. Here, which three of the four antenna ports are actually used and correspond to the antenna ports for TPMI indication may be predefined by the specifications (e.g., SRS antenna ports 0 to 2 correspond to TPMI antenna ports 0 to 2 (TPMI=0 to 2)) and may be configured in the SRS configuration.

[0097] In this case, even if SRS using four antenna ports is configured, the UE transmits SRS using 3Tx (three SRS antenna ports 0 to 2) for that configuration (four-port SRS configuration).

[0098] That is, in this case, even if an SRS using four antenna ports is configured, the UE may control the transmission of the SRS (PUSCH) assuming that an SRS using three antenna ports is configured.

[0099] [Option 2] A three-port SRS resource (SRS resource using three antenna ports) may refer to one one-port SRS (SRS corresponding to one antenna port) and two two-port SRS (SRS corresponding to two antenna ports). Here, which antenna ports the three ports (three antenna ports) correspond to for the TPMI indication may be predefined by the specification (e.g., one-port SRS corresponds to antenna port 0 of TPMI, and two-port SRS corresponds to antenna ports 1 and 2 of TPMI, or two-port SRS corresponds to antenna ports 0 and 1 of TPMI, and one-port SRS corresponds to antenna port 2 of TPMI), configured in the SRS configuration, or dynamically indicated by a new field in the DCI.

[0100] [Option 3] A 3-port SRS resource (SRS resource using three antenna ports) may mean three 1-port SRS (SRS corresponding to one antenna port), where the 3-port (three antenna ports) correspond to which antenna port for TPMI indication may be predefined by the specification (e.g., the first 1-port SRS corresponds to antenna port 0 of TPMI, the second 1-port SRS corresponds to antenna port 1 of TPMI, and the third 1-port SRS corresponds to antenna port 2 of TPMI), configured in the SRS configuration, or dynamically indicated by a new field in the DCI.

[0101] (Transmission power control) <PUSCH transmission power control> In NR, the transmission power of PUSCH is controlled based on the TPC command (also called a value, increase / decrease value, correction value, etc.) indicated by the value of a field in DCI (also called a TPC command field, etc.).

[0102] For example, when a UE transmits a PUSCH on an active UL BWP b of a carrier f of a serving cell c using a parameter set (open loop parameter set) with index j and a power control adjustment state (PUSCH power control adjustment state) with index l, the transmission power (P ＰＵＳＣＨ、ｂ，ｆ，ｃ (i, j, q ｄ , l)) [dBm] is expressed as follows (Equation 1): ＣＭＡＸ，ｆ，ｃ（ｉ） , P Ｏ＿ＰＵＳＣＨ，ｂ，ｆ，ｃ (j), M ＰＵＳＣＨ ＲＢ，ｂ，ｆ，ｃ (i), α ｂ，ｆ，ｃ (j), P.L. ｂ，ｆ，ｃ (q ｄ ), Δ ＴＦ，ｂ，ｆ，ｃ (i), f ｂ，ｆ，ｃ (i, l), may be based on at least one of

[0103] (Formula 1)

[0104] The power control adjustment state may be referred to as a closed loop (CL)-power control (PC) state, a value based on TPC commands of a power control adjustment state index l, an accumulated value of TPC commands, or a value due to closed loop, where l may be referred to as a closed loop index.

[0105] Furthermore, the PUSCH transmission opportunity i is a period during which the PUSCH is transmitted, and may be composed of, for example, one or more symbols, one or more slots, etc.

[0106] P ＣＭＡＸ，ｆ，ｃ(i) is, for example, the maximum transmit power of the user terminal configured for carrier f of serving cell c at transmission opportunity i (configured maximum output power, UE configured maximum output power).

[0107] P Ｏ＿ＰＵＳＣＨ，ｂ，ｆ，ｃ (j) is, for example, a parameter related to the target received power (e.g., a parameter related to the transmit power offset, also referred to as a transmit power offset P0, a target received power parameter, etc.) set for the active UL BWP b of the carrier f of the serving cell c at the transmission opportunity i. Ｏ＿ＰＵＳＣＨ，ｂ，ｆ，ｃ (j) is P Ｏ＿ＮＯＭＩＮＡＬ＿ＰＵＳＣＨ，ｆ，ｃ (j) and P Ｏ＿ＵＥ＿ＰＵＳＣＨ，ｂ，ｆ，ｃ It may be the sum of (j).

[0108] M ＰＵＳＣＨ ＲＢ，ｂ，ｆ，ｃ (i) is the number of resource blocks (bandwidth) allocated to PUSCH for transmission opportunity i in active UL BWP b of carrier f with serving cell c and subcarrier spacing μ, for example. ｂ，ｆ，ｃ (j) is a value provided by a higher layer parameter (e.g., also called msg3-Alpha, p0-PUSCH-Alpha, fractional factor, etc.).

[0109] PL ｂ，ｆ，ｃ (q ｄ ) is, for example, an index q of a reference signal (RS, pathloss reference RS, pathloss (PL)-RS, pathloss reference RS, pathloss measurement DL-RS, PUSCH-PathlossReferenceRS) for downlink BWP associated with an active UL BWP b of carrier f of serving cell c. ｄ is the path loss (path loss estimation [dB], path loss compensation) calculated by the user terminal using

[0110] If the UE is not provided with a pathloss reference RS (e.g., PUSCH-PathlossReferenceRS) or if the UE is not provided with individual upper layer parameters, the UE may use RS resources from a synchronization signal (SS) / physical broadcast channel (PBCH) block (SS block (SSB)) used to obtain a Master Information Block (MIB). ｂ，ｆ，ｃ (q ｄ ) may be calculated.

[0111] When the UE is configured with a number of RS resource indices up to the value of the maximum number of pathloss reference RSs (e.g., maxNrofPUSCH-PathlossReferenceRSs) and a set of RS configurations for the RS resource indices according to the pathloss reference RSs, the set of RS resource indices may include one or both of a set of SS / PBCH block indices and a set of channel state information (CSI)-reference signal (RS) resource indices. ｄ may be identified.

[0112] If a PUSCH transmission is scheduled by a Random Access Response (RAR) UL grant, the UE uses the same RS resource index q as for the corresponding PRACH transmission. ｄ may also be used.

[0113] When a UE is provided with a power control configuration for the PUSCH by a sounding reference signal (SRS) resource indicator (SRI) (e.g., SRI-PUSCH-PowerControl) and with one or more values ​​of ID of the pathloss reference RS, the UE may obtain a mapping between a set of values ​​for the SRI field in DCI format 0_1 ​​and a set of ID values ​​of the pathloss reference RS from higher layer signaling (e.g., sri-PUSCH-PowerControl-Id in SRI-PUSCH-PowerControl). The UE may obtain the RS resource index q from the ID of the pathloss reference RS mapped to the SRI field value in DCI format 0_1 ​​that schedules the PUSCH. ｄ may be determined.

[0114] If a PUSCH transmission is scheduled by DCI format 0_0 and the UE is not provided with PUCCH spatial relationship information for the PUCCH resource with the lowest index for the active UL BWP b of each carrier f and serving cell c, the UE shall transmit the PUCCH spatial relationship information for the PUCCH resource with the same RS resource index q as the PUCCH transmission in that PUCCH resource. ｄ may also be used.

[0115] If the PUSCH transmission is scheduled by DCI format 0_0 and the UE is not provided with a spatial setting for the PUCCH transmission, or if the PUSCH transmission is scheduled by DCI format 0_1 ​​that does not include an SRI field, or if the UE is not provided with a power control setting for the PUSCH by the SRI, the UE shall select an RS resource index q with an ID of a path loss reference RS of zero. ｄ may also be used.

[0116] For PUSCH transmission configured by a configured grant configuration (e.g., ConfiguredGrantConfig), if the configured grant configuration includes a specific parameter (e.g., rrc-ConfiguredUplinkGrant), the RS resource index q is determined by a path loss reference index (e.g., pathlossReferenceIndex) in the specific parameter. ｄ may be provided to the UE.

[0117] For the PUSCH transmission configured by the configuration grant configuration, if the configuration grant configuration does not include a specific parameter, the UE may determine the RS resource index q from the value of the ID of the path loss reference RS mapped to the SRI field in the DCI format that activates the PUSCH transmission. ｄ If the DCI format does not include an SRI field, the UE may determine an RS resource index q with an ID of a pathloss reference RS of zero. ｄ may be determined.

[0118] Δ ＴＦ，ｂ，ｆ，ｃ (i) is the transmission power adjustment component (offset, transmission format compensation) for UL BWP b of carrier f of serving cell c.

[0119] f ｂ，ｆ，ｃ (i, l) is the PUSCH power control adjustment state for the active UL BWP b of carrier f of serving cell c at transmission opportunity i. ｂ，ｆ，ｃ (i,l) may be based on δPUSCH,b,f,c(i,l).

[0120] If TPC accumulation is valid, f ｂ，ｆ，ｃ (i,l) may be based on the accumulated value of δPUSCH,b,f,c(m,l).

[0121] If TPC accumulation is invalid, f ｂ，ｆ，ｃ (i,l) may be δPUSCH,b,f,c(i,l) (absolute value).

[0122] If information indicating that TPC accumulation is disabled (TPC-Accumulation) is not set (if information indicating that TPC accumulation is disabled is not provided, and TPC accumulation is set to be enabled), the UE accumulates TPC command values ​​and determines the transmit power based on the accumulation result (power control state) (applies the TPC command values ​​via accumulation).

[0123] When information indicating that TPC accumulation is disabled (TPC-Accumulation) is set (when information indicating that TPC accumulation is disabled is provided, when TPC accumulation is set to disabled), the UE does not accumulate TPC command values ​​and determines the transmission power based on the TPC command values ​​(power control state) (applies the TPC command values ​​without using accumulation).

[0124] δPUSCH,b,f,c(i,l) may be the TPC command value included in DCI format 0_0 or DCI format 0_1 ​​that schedules PUSCH transmission opportunity i on active UL BWP b of carrier f of serving cell c, or the TPC command value jointly coded with other TPC commands in DCI format 2_2 with CRC scrambled by a specific Radio Network Temporary Identifier (RNTI) (e.g., TPC-PUSCH-RNTI).

[0125] Σ m=0 C(Di)-1 δPUCCH,b,f,c(m,l) is the group / cardinality C(D i ) a set of TPC command values ​​D i It may be the sum of the TPC command values ​​in i is the number of PUSCH transmission opportunities i-i0 on the active UL BWP b of carrier f of serving cell c for the PUSCH power control adjustment state l. PUSCH (i-i0)-1 symbols ago and K of PUSCH transmission opportunity i PUSCH (i) may be the set of TPC command values ​​received between symbols (i) and (ii) for PUSCH transmission opportunity i-i. PUSCH(i-i0) symbols ago is K of PUSCH transmission opportunity i PUSCH (i) It may be the smallest positive integer that is earlier than the symbol before.

[0126] If PUSCH transmission is scheduled by DCI format 0_0 or DCI format 0_1, K PUSCH (i) may be the number of symbols in the active UL BWP b of carrier f of serving cell c after the last symbol of the corresponding PDCCH reception and before the first symbol of the PUSCH transmission. If PUSCH transmission is configured by configured grant configuration information (ConfiguredGrantConfig), then K PUSCH (i) is the number of symbols per slot N in the active UL BWP b of carrier f of serving cell c symb slot and the minimum value of the value provided by k2 in the PUSCH common configuration information (PUSCH-ConfigCommon). PUSCH,min It may also be the number of symbols.

[0127] The power control adjustment state may be configured to have multiple states (e.g., two states) or a single state depending on a higher layer parameter. When multiple power control adjustment states are configured, one of the multiple power control adjustment states may be identified by an index l (e.g., l∈{0, 1}).

[0128] <SRS Transmission Power Control> Using the index l of the power control adjustment state (closed-loop state), the transmission power (P ＳＲＳ、ｂ，ｆ，ｃ (i, q ｓ , l)) is P ＣＭＡＸ，ｆ，ｃ (i), P Ｏ＿ＳＲＳ，ｂ，ｆ，ｃ (q ｓ ), M ＳＲＳ，ｂ，ｆ，ｃ (i), α ＳＲＳ，ｂ，ｆ，ｃ (q ｓ ), P.L.ｂ，ｆ，ｃ (q ｄ ), h ｂ，ｆ，ｃ Based on (i, l), it is given by the following equation (Equation 2).

[0129] (Formula 2)

[0130] Furthermore, the SRS transmission opportunity i is a period during which the SRS is transmitted, and may be composed of, for example, one or more symbols, one or more slots, or the like.

[0131] Here, P ＣＭＡＸ，ｆ，ｃ (i) is, for example, the UE maximum output power for carrier f of serving cell c at SRS transmission opportunity i. P Ｏ＿ＳＲＳ，ｂ，ｆ，ｃ (q ｓ ) is the active UL BWP b of carrier f of serving cell c and the SRS resource set q ｓ (provided by SRS-ResourceSet and SRS-ResourceSetId), and a parameter related to the target received power provided by p0 for (for example, a parameter related to the transmit power offset, also referred to as the transmit power offset P0 or the target received power parameter, etc.).

[0132] M ＳＲＳ，ｂ，ｆ，ｃ (i) is the SRS bandwidth in number of resource blocks for SRS transmission opportunity i on active UL BWP b of carrier f of serving cell c and subcarrier spacing μ;

[0133] α ＳＲＳ，ｂ，ｆ，ｃ (q ｓ ) is the active UL BWP b of a serving cell c and carrier f with subcarrier spacing μ and an SRS resource set q ｓ and α (e.g., alpha) for α (e.g., alpha) may be defined as a path loss compensation factor for UL power control.

[0134] PL ｂ，ｆ，ｃ (q ｄ ) is the active DL BWP of serving cell c and the SRS resource set q ｓ and, for RS resource index q ｄis the DL path loss estimate [dB] (path loss estimate [dB], path loss compensation) calculated by the UE using the RS resource index q ｄ is the SRS resource set q ｓ and a pathloss reference RS (pathloss reference RS, pathloss (PL)-RS, DL-RS for pathloss measurement, e.g., provided by pathlossReferenceRS) associated with the SS / PBCH block index (e.g., ssb-Index) or a CSI-RS resource index (e.g., csi-RS-Index).

[0135] If the UE is not provided with pathloss reference RSs (pathlossReferenceRSs) or before the UE is provided with individual upper layer parameters, the UE may use RS resources obtained from the SS / PBCH block used by the UE to acquire the MIB. ｂ，ｆ，ｃ (q ｄ ) is calculated.

[0136] h ｂ，ｆ，ｃ (i, l) is the SRS power control adjustment state for the active UL BWP of carrier f of serving cell c at SRS transmission opportunity i. If the SRS power control adjustment state configuration (e.g., srs-PowerControlAdjustmentStates) indicates the same power control adjustment state for SRS transmission and PUSCH transmission, the current PUSCH power control adjustment state f ｂ，ｆ，ｃ On the other hand, when the setting of the SRS power control adjustment state indicates independent power control adjustment states for SRS transmission and PUSCH transmission, the SRS power control adjustment state h ｂ，ｆ，ｃ (i) is δ ＳＲＳ，ｂ，ｆ，ｃ It may be based on (m).

[0137] If TPC accumulation is valid, h ｂ，ｆ，ｃ (i) is δ ＳＲＳ，ｂ，ｆ，ｃ It may be based on the cumulative value of (m).

[0138] If TPC accumulation is invalid, h ｂ，ｆ，ｃ (i) is δ ＳＲＳ，ｂ，ｆ，ｃ (i) (absolute value) may also be used.

[0139] where δ ＳＲＳ，ｂ，ｆ，ｃ (m) may be a TPC command value that is jointly coded with other TPC commands in a PDCCH having DCI (e.g., DCI format 2_3). m=0 C(Si)-1 δ SRS,b,f,c (m) is the SRS transmission opportunity i-i on the active UL BWP b of carrier f with serving cell c and subcarrier spacing μ. ０ K ＳＲＳ (i-i ０ )-1 symbol before and K ＳＲＳ (i) The cardinality C(S ｉ ) a set S of TPC command values ｉ may be the sum of the TPC commands in ０ is the SRS transmission opportunity i-i ０ K ＳＲＳ (i-i ０ )-1 symbols before is K ＳＲＳ (i) It may be the smallest positive integer that is earlier than the symbol before.

[0140] If the SRS transmission is aperiodic, K SRS (i) may be the number of symbols in the active UL BWP b of carrier f of serving cell c after the last symbol of the corresponding PDCCH that triggers the SRS transmission and before the first symbol of the SRS transmission. If the SRS transmission is semi-persistent or periodic, K SRS (i) is the number of symbols per slot N in the active UL BWP b of carrier f of serving cell c symb slot and the minimum value of the value provided by k2 in the PUSCH common configuration information (PUSCH-ConfigCommon). SRS,min It may also be the number of symbols.

[0141] In Rel. 15 / 16, P0 and α for one closed loop (CL) state index are configured by RRC.

[0142] In Rel.17, if TCI-State is provided in dl-OrJointTCI-StateList or TCI-UL-State, P0 and α for one closed-loop (CL) state index are as follows: - if followUnifiedTCIstateSRS (setting SRS to follow unified TCI state) is provided, they are given by p0AlphaSetforSRS associated with the indicated TCI-State or the indicated TCI-UL-State. - otherwise, if followUnifiedTCIstateSRS is not provided, they are given by p0AlphaSetforSRS associated with the TCI-State or TCI-UL-State of the SRS resource with the lowest SRS-ResourceId in the SRS resource set.

[0143] In Rel. 15 / 16, the PL-RS uses the SRS resource set q s If pathlossReferenceRS is not provided, the UE uses the RS resource obtained from the SS / PBCH block with the same SS / PBCH block index as the SS / PBCH block index of the SS / PBCH block used to obtain the MIB for pathloss calculation (RS resource index q for pathloss PL). d If neither pathlossReferenceRS nor spatialRelationInfo is provided and enableDefaultBeamPL-ForSRS is configured, the UE uses the default RS for pathloss calculation (RS resource index q for pathloss PL). dThe index of the default RS provides periodic RS resources with qcl-Type set to 'typeD' in the following TCI states or QCL assumptions: - If a CORESET is provided in the active DL BWP of the serving cell c, the TCI state or QCL assumption of the CORESET with the lowest index in the active DL BWP. - If a CORESET is not provided in the active DL BWP of the serving cell c, the active PDSCH TCI state with the lowest ID in the active DL BWP.

[0144] In Rel. 17, if a TCI-State is provided in dl-OrJointTCI-StateList (DL or Joint TCI state list) or TCI-UL-State (UL TCI state), the PL-RS shall follow: - if followUnifiedTCIstateSRS is provided, the indicated TCI-State or indicated TCI-UL-State from the set of configured TCI-State or indicated TCI-UL-State, which is the applied TCI state; - otherwise, the same RS as the PL-RS in Rel. 15 / 16.

[0145] (UE Sounding Procedure for DL ​​CSI Acquisition) In Rel. 15 NR, as described above, antenna switching (which may also be referred to as antenna port switching) can be configured for use with SRS. SRS antenna switching may be used, for example, when downlink CSI acquisition is performed using uplink SRS in a Time Division Duplex (TDD) band.

[0146] For example, for UEs capable of having fewer antenna ports available for transmission than for reception, UL SRS measurements may be used to determine the DL precoder.

[0147] In addition, the UE may report UE capability information (e.g., supportedSRS-TxPortSwitch in the RRC parameter srs-TxSwitch) indicating the SRS transmit (Tx) port switching pattern it supports to the network. This pattern may be expressed in the form of "txry," such as "t1r2," "t2r4," etc., which may mean that SRS can be transmitted using x antenna ports out of a total of y antennas (which may be expressed as xTyR), where y may correspond to all or a subset of the UE's receive antennas.

[0148] When x and y in "txty" have the same value, they may be written as xT=xR (for example, 4T=4R).

[0149] For example, a 2T4R (two transmit ports, four receive ports) UE may be configured with an SRS resource set for DL ​​CSI acquisition that includes two SRS resources with two ports each and whose purpose is antenna switching.

[0150] The UE capability information for SRS transmission switch (srs-TxSwitch) indicates whether the UE supports SRS for DL ​​CSI acquisition (DL CSI acquisition, transmit antenna switching, SRS antenna switching). The UE capability information includes a parameter supportedSRS-TxPortSwitch. The supportedSRS-TxPortSwitch indicates the SRS Tx port switching pattern supported by the UE. The SRS transmission port switching pattern is a mandatory function that involves capability signaling.

[0151] In the present disclosure, the terms SRS Tx port switching pattern and SRS antenna switching setting may be read interchangeably.

[0152] The value of supportedSRS-TxPortSwitch may indicate 't1r2' for 1T2R, 't2r4' for 2T4R, 't1r4' for 1T4R, 't1r4-t2r4' for 1T4R / 2T4R, 't1r1' for 1T=1R, 't2r2' for 2T=2R, 't4r4' for 4T=4R, or 'notSupported' for not supported.

[0153] The UE antenna switching capability, denoted by supportedSRS-TxPortSwitch as xTyR ('txry'), corresponds to a UE capable of SRS transmission on x antenna ports across a total of y antennas, where y corresponds to all or a subset of the UE receive antennas. For example, 2T4R is two pairs of antennas.

[0154] supportedSRS-TxPortSwitch MAY report at least one of the following values: 't1r2', 't1r4', 't2r4', 't2r2', 't4r4', 't1r4-t2r4'

[0155] srs-TxSwitch may include txSwitchImpactToRx and txSwitchWithAnotherBand. txSwitchImpactToRx indicates the lowest band entry number of the UL group (see txSwitchWithAnotherBand below) that affects the DL of this band entry. txSwitchWithAnotherBand indicates the lowest band entry number of the UL group. The UL group is defined as band entries with ULs that affect each other's ULs. That is, SRS Tx port switching on any cell in the group affects the ULs on all cells in the group. If the UL group contains only one band entry, this parameter is not present. For txSwitchImpactToRx and txSwitchWithAnotherBand, a value of 1 means the first entry, and a value of 2 means the second entry. Even if supportedSRS-TxPortSwitch is set to 'notSupported' for a band entry, the UE may include txSwitchImpactToRx and txSwitchWithAnotherBand in that band entry. All DL and UL bands that switch together shall indicate the same entry number. The entry number is the band entry number within the band combination. The UE is restricted from including fallback band combinations for the purpose of indicating different SRS switching capabilities. The band containing the UL band shall include a band that corresponds to support for SRS-SwitchingTimeNR and is associated with FeatureSetUplinkId set to 0.

[0156] When a UE is configured with an SRS resource set (SRS-ResourceSet) and the usage within that SRS resource set (higher layer parameter usage) is set to antenna switching ('antennaSwitching'), the UE does not assume that different spatial relationships are configured for multiple SRS resources within the same SRS resource set.

[0157] If a UE is configured with an SRS resource set (SRS-ResourceSet) and the usage (higher layer parameter usage) within that SRS resource set is set to antenna switching ('antennaSwitching'), the UE may be configured with one of the following configurations 1 to 5 depending on the indicated (reported) UE capability information (UE antenna switching capability information, which may be UE capability information indicating the SRS transmit port switching pattern (SRS antenna switching configuration) supported by the UE, supportedSRS-TxPortSwitch).

[0158] [Configuration 1] For 1T2R, up to two SRS resource sets with different values ​​for the resource type (higher layer parameter resourceType) within the SRS resource set, each set having two SRS resources transmitted in different symbols, each SRS resource in a given set consisting of a single SRS port, and the SRS port of the second resource in the set being associated with a different UE antenna port than the SRS port of the first resource in the same set.

[0159] [Configuration 2] For 2T4R, up to two SRS resource sets with different values ​​for the resource type (higher layer parameter resourceType) within the SRS resource set, where each SRS resource set has two SRS resources transmitted in different symbols, each SRS resource in a given set consists of two SRS ports, and the SRS port pair of the second resource in the set is associated with a different UE antenna port pair than the SRS port pair of the first resource in the same set.

[0160] Configuration 3: For 1T4R, zero or one SRS resource set with four SRS resources transmitted in different symbols, with the resource type within the SRS resource set (higher layer parameter resourceType) set to periodic or semi-persistent. Each SRS resource in a given set consists of a single SRS port, and each SRS port of a resource is associated with a different UE antenna port.

[0161] [Configuration 4] For 1T4R, zero or two SRS resource sets each configured with a resource type (higher layer parameter resourceType) within the SRS resource set set to aperiodic, with a total of four SRS resources transmitted in different symbols of two different slots. The SRS ports of each SRS resource within the two given sets are associated with different UE antenna ports. Each of the two sets is configured with two SRS resources, or one set is configured with one SRS resource and the other set is configured with three SRS resources. The UE expects both sets to be configured with the same values ​​of the power control parameters within the SRS resource set (higher layer parameters alpha, p0, pathlossReferenceRS, and srs-PowerControlAdjustmentStates). The UE assumes that the values ​​of the parameters (the upper layer parameter aperiodicSRS-ResourceTrigger, a parameter indicating the codepoint of the SRS request field in the DCI) in each SRS resource set are the same, and that the values ​​of the upper layer parameter slotOffset in each SRS resource set are different.

[0162] [Configuration 5] Up to two SRS resource sets, each with one SRS resource, for 1T=1R, 2T=2R, or 4T=4R. The number of SRS ports for each resource is 1, 2, or 4.

[0163] If the UE is configured for antenna switching usage within the SRS resource set, the UE may configure the SRS antenna switching configuration depending on the reported UE capability information (supportedSRS-TxPortSwitch, supportedSRS-TxPortSwitch-v1610).

[0164] If a set of SRS resources is transmitted in the same slot as Y symbols, the UE is configured with a guard period of Y symbols during which the UE does not transmit any other symbols. The guard period is between the SRS resources of the set.

[0165] If the indicated UE capability is 1T4R / 2T4R, the UE is assumed to be configured with the same SRS port number of 1 or 2 for all SRS resources in the SRS resource set.

[0166] If the indicated UE capability is 1T2R, 2T4R, 1T4R, or 1T4R / 2T4R, the UE shall not configure or trigger more than one SRS resource set with usage (higher layer parameter usage) set to antenna switching in the same slot. If the indicated UE capability is 1T1R, 2T2R, or 4T4R, the UE shall not configure or trigger more than one SRS resource set with usage (higher layer parameter usage) set to antenna switching in the same symbol.

[0167] The UE capability information for the SRS transmission switch (srs-TxSwitch-v1610) may include a parameter supportedSRS-TxPortSwitch-v1610. Reporting of this parameter is optional. supportedSRS-TxPortSwitch-v1610 indicates a downgrading configuration of the SRS transmission port switching pattern, and reporting of this parameter is optional. When the UE indicates support for a downgrading configuration of the SRS transmission port switching pattern using supportedSRS-TxPortSwitch-v1610, the UE may report at least one of the following values ​​to indicate support for the downgrading configuration based on the content reported in supportedSRS-TxPortSwitch:・'t1r1-t1r2' ・'t1r1-t1r2-t1r4' ・'t1r1-t1r2-t2r2-t2r4' ・'t1r1-t2r2' ・'t1r1-t2r2-t4r4' ・'t1r1-t1r2-t2r2-t1r4-t2r4'

[0168] In the present disclosure, the downgrade configuration and the SRS Tx port switching pattern using antennas / ports that are less than the total number of antennas / total number of antennas / total number of Rx antennas / maximum number of Rx ports may be read interchangeably.

[0169] The Rel. 17 UE capability signaling (srs-AntennaSwitchingBeyond4RX-r17) indicates whether the UE supports SRS antenna switching for more than four Rx. The capability signaling has several parameters: - supportedSRS-TxPortSwitchBeyond4Rx-r17. It indicates the supported xTyR combinations. It is an 11-bit bitmap. The bitmap starts from the first / leftmost bit (bit 0). Each bit corresponds to {t1r1, t2r2, t1r2, t4r4, t2r4, t1r4, t2r6, t1r6, t4r8, t2r8, t1r8}. In any displayed value, x is less than or equal to the x value associated with the largest y. - entryNumberAffectBeyond4Rx-r17. - entryNumberSwitchBeyond4Rx-r17: It indicates the entry number of the first listed band with this UL in the band combination that affects this DL. - entryNumberSwitchBeyond4Rx-r17: It indicates the entry number of the first listed band with this UL in the band combination that switches with UL.

[0170] A UE indicating support for this capability indicates support for srs-TxSwitch.

[0171] If the same xYyR value reported in supportedSRS-TxPortSwitchBeyond4Rx-r17 as the xYyR value reported using supportedSRS-TxPortSwitch / supportedSRS-TxPortSwitch-v1610 is reported, the reported values ​​of entryNumberAffectBeyond4Rx-r17 and entryNumberSwitchBeyond4Rx-r17 are invalid.

[0172] In the present disclosure, the terms SRS transmission port switching pattern and antenna switching SRS setting may be read interchangeably.

[0173] (SRS setting for antenna switching) Regarding the SRS setting for xTyR described above, the following contents are supported for each release.

[0174] In Rel. 15 / 16, up to two SRS resource sets can be configured for 1T2R, 2T4R, 1T4R, 1T4R / 2T4R, or when T=R.

[0175] In Rel. 17, different SRS resource sets can be configured for 1T6R, 1T8R, 2T6R, 2T8R, and 4T8R.

[0176] For example, for 2T8R, one periodic SRS resource set can be configured. The SRS resource set has four SRS resources. Each SRS resource consists of two SRS ports. Different SRS resource SRS port pairs in the SRS resource set are associated with different UE antenna port pairs.

[0177] Additionally, for 2T8R, one or two semi-persistent SRS resource sets or up to one periodic SRS resource set can be configured for new UE capabilities. Each SRS resource set has four SRS resources. Each SRS resource consists of two SRS ports. Different SRS resource SRS port pairs within an SRS resource set are associated with different UE antenna port pairs.

[0178] For 2T8R, one to four aperiodic SRS resource sets can be configured. Each SRS resource set has four SRS resources. Each SRS resource consists of two SRS ports. Different SRS resource SRS port pairs within an SRS resource set are associated with different UE antenna port pairs.

[0179] In Rel. 17, more SRS resource sets can be supported: 1T2R, 2T4R, 1T4R, 1T4R / 2T4R, or for T=R.

[0180] In Rel. 18, multiple SRS resource sets can be configured for 8T=8R.

[0181] (Considerations for 3Tx UL Transmission) According to the above-mentioned codebook for 3Tx UE, one SRS resource set may include one 1-port SRS resource and one 2-port SRS resource (e.g., as one 3-port SRS resource), or two 1-port SRS resources and two 2-port SRS resources (e.g., as two 3-port SRS resources). In this case, one precoder for 3Tx PUSCH transmission corresponds to one 1-port SRS resource and one 2-port SRS resource (Case 1).

[0182] As another example, one SRS resource set may include three 1-port SRS resources (e.g., as one 3-port SRS resource) or six 1-port SRS resources (e.g., as two 3-port SRS resources), in which case one 3-Tx PUSCH transmission precoder corresponds to the three 1-port SRS resources (Case 2).

[0183] As described above, in 3Tx UL transmission, a noncoherent precoder is mainly considered. In addition, in SRS resource configuration, SRS resources that can be configured for one SRS resource set include 4-port SRS resources, {1, 2}-port SRS resources, and {1, 1, 1}-port SRS resources.

[0184] In such a case where multiple SRS resources are required for measurement (sounding) of each port, the multiple SRS resources may be FDMed (Frequency Division Multiplexed) / TDMed (Time Division Multiplexed).

[0185] Incidentally, the specifications state the following regarding SRS transmission power control. Note that what is stated in the specifications corresponds to what the terminal should execute. Note that in the following description, P －denotes a variable with a line over it, and may also be called P-bar.

[0186] When a UE is provided with TDM for one 8-port SRS resource in one SRS resource set whose usage is set to “codebook” or “antennaSwitching”, the UE may transmit with a transmission power P ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) linear value P － ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) equally among the antenna port(s) configured in each symbol for SRS transmission in the active UL BWP b of carrier f of serving cell c.

[0187] Otherwise, the UE sets the transmission power P ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) linear value P － ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) equally among the antenna ports configured for SRS in the active UL BWPb of carrier f of serving cell c.

[0188] That is, according to the example of the specification described above, the UE controls the division of transmission power among multiple antenna ports according to the number of ports of the SRS resource, in accordance with the following rules 1 and 2.

[0189] (Rule 1) For 8-port SRS resources that are TDMed, the transmission power P ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) linear value P － ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) is divided equally among the antenna ports configured in each symbol of SRS transmission.

[0190] (Rule 2) For other SRS resources, the transmission power P ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) linear value P － ＳＲＳ，ｂ，ｆ，ｃ (i, q Ｓ , l) is divided equally among the antenna ports configured for SRS.

[0191] If the above rules are applied as they are to a 3Tx UE, the following problems may occur.

[0192] For example, when a 4-port SRS resource is used, assuming Rule 2 above, the SRS transmission power per port is ¼ of the total transmission power. However, in 3-Tx UL transmission, one of the four ports is technically unnecessary. In this case, it may be assumed that no transmission is performed on the unused port.

[0193] Also, when TDMed {1,2}-port SRS resources are used: - According to Rule 1, the SRS transmit power per port is different for each resource; - According to Rule 2, the SRS transmit power per port is the same, but the transmit power for 1-port SRS resources can assume a larger transmit power budget.

[0194] Also, when TDMed {1,1,1} port SRS resources are used, in either rule 1 / 2, the transmit power per port can be realized / achieved to be 1 / 3 of the total transmit power (distributed 1 / 3 each).

[0195] In this way, when TDMed {1,2} / {1,1,1} port SRS resources are used, the total SRS transmit power within a given OFDM symbol can be interpreted as exceeding (exceeding) the actual available transmit power, as long as the rules based on existing specifications are followed.

[0196] In other words, if the existing rules are applied as is to 3Tx UE, there is a risk that the transmit power for each port will be wasted or that an unrealizable power (exceeding the actually available transmit power) will be set, resulting in inappropriate transmit power control.

[0197] (Analysis) As mentioned above, in 3Tx UL transmission, UL full power transmission is not supported and SRS extension is not applied. In this case, a non-coherent UL codebook can be assigned to the UE to easily realize 3-antenna port codebook-based transmission.

[0198] As SRS settings that support such codebook-based 3Tx UL transmission, the following Alt1 to Alt2 can be selected.

[0199] <Alt1> In one resource set, one port out of multiple (four) ports is muted, and configuration of X 4-port SRS resources is supported.

[0200] <Alt2> In one resource set, configuration of X SRS resources with the same / different port numbers (1+2 or 1+1+1) is supported.

[0201] In 3Tx UL (PUSCH) transmission, when multiple SRS resources are utilized, it is required to achieve the same transmit power on all SRS ports.

[0202] As in the above-mentioned Alt1, in 3Tx UL transmission, it is necessary to consider power allocation (power division) when there are four SRS resources and one port is set / instructed to be muted.

[0203] For example, dividing the transmit power by three requires a higher power amplifier than is supported by a typical four-port SRS, since the transmit power is divided into four equal parts.

[0204] On the other hand, when the transmission power is divided into four, one port is muted, so the total transmission power may be reduced to 3 / 4.

[0205] Also, as in Alt2, for example, it is possible to treat the SRS resources of ports {1, 2} as one existing SRS resource for power control of 3Tx SRS. In this case, the UE calculates one transmission power using the existing method and then distributes the one transmission power to the three ports.

[0206] In the case of TDM, the transmission power determined based on the existing scheme can be divided among multiple ports transmitted in one OFDM symbol. To achieve equal transmission power among ports, it is considered to apply the minimum transmission power per port among the SRS ports to all SRS ports.

[0207] In the case of FDM, to achieve equal transmit power among ports, the transmit power determined based on existing schemes can be divided by the total number of ports across all SRS resources in an OFDM symbol.

[0208] Another possible method is to treat each of the SRS resources of the {1, 2} ports as (in the same way as) one existing SRS resource for the purpose of power control of the 3Tx SRS.

[0209] For example, the UE calculates the transmission power for each of the SRS resources of the {1, 2} ports based on an existing scheme, and it is possible to realize equal transmission power among multiple ports based on the calculated transmission power.

[0210] More specifically, when 3Tx PUSCH transmission is configured and {1, 2}-port SRS resources are configured for UL channel sounding, the transmission power of the 2-port SRS is set to twice that of the 1-port SRS, and the transmission power of the 2-port SRS is divided by the number of ports (2), so that the transmission power of each port is evenly distributed.

[0211] However, the Rel. 18 specifications do not allow for the above power allocation because in Rel. 18, all SRS resources in an SRS resource set have the same transmission power.

[0212] Also, according to existing specifications, for PUSCH transmission power control, the UE scales the PUSCH transmission power according to the ratio of the number of antenna ports with non-zero PUSCH transmission power to the maximum number of SRS ports supported by the UE in one SRS resource.

[0213] For example, in any of the following cases 1 to 3, it is necessary to clarify how the base station understands the maximum number of SRS ports supported by the UE for one SRS resource. <Case 1> In 3Tx UL transmission, a 4-port SRS is used / configured, and one of the four ports is muted. <Case 2> In 3Tx UL transmission, two SRS resources are configured, one of which is a 2-port SRS resource and the other is a 1-port SRS resource (when a {2,1} / {1,2}-port SRS resource is configured (see, for example, Figure 9A)). <Case 3> In 3Tx UL transmission, three SRS resources are configured, and each SRS resource is a 1-port SRS resource (when a {1,1,1}-port SRS resource is configured (see, for example, Figure 9B)).

[0214] In other words, it is necessary to consider a method for controlling power distribution for Rel. 19 and later.

[0215] Thus, if various rules regarding power allocation for 3Tx UL (e.g., PUSCH / SRS) transmission are not clear, there is a risk that the UE will not be able to control appropriate UL transmission.

[0216] Therefore, the inventors came up with the idea of ​​a wireless communication method according to the present disclosure.

[0217] Hereinafter, embodiments of 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.

[0218] (Various Reinterpretations) In the present disclosure, a word enclosed in "( )" in a sentence may indicate an explanation of the word immediately preceding it (for example, an explanation of spelling), a paraphrase, a specific example, a supplementary explanation, etc. Furthermore, in the present disclosure, a word enclosed in "[ ]" in a sentence may be interpreted including the word in the meaning of the entire sentence, or may be interpreted excluding (ignoring) the word in the meaning of the entire sentence. Note that "( )" and "[ ]" may also be used for purposes / meanings other than those mentioned above.

[0219] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0220] In the present disclosure, terms such as notify, activate, deactivate, indicate (or indicate), select, configure, update, and determine may be read interchangeably. In the present disclosure, terms such as support, control, controllable, operate, and operate may be read interchangeably.

[0221] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, fields, information elements (IEs), settings, etc. may be interchangeable. In the present disclosure, Medium Access Control (MAC) control elements (CEs), update commands, activation / deactivation commands, etc. may be interchangeable.

[0222] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, or a combination thereof.

[0223] In the present disclosure, MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. 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.

[0224] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0225] In the present disclosure, the terms index, identifier (ID), indicator, resource ID, etc. may be interchangeable. In the present disclosure, the terms sequence, list, set, group, cluster, subset, etc. may be interchangeable.

[0226] In the present disclosure, the terms panel, UE panel, panel group, beam, beam group, precoder, Uplink (UL) transmitting entity, Transmission / Reception Point (TRP), base station, Spatial Relation Information (SRI), spatial relation, SRS Resource Indicator (SRI), Control Resource Set (CORESET), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), antenna port (e.g., Demodulation Reference Signal (DMRS) port), antenna port group (e.g., DMRS port group), group (e.g., spatial relation group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resource (e.g., reference signal resource, SRS resource), resource set (e.g., reference signal resource set), CORESET pool, downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, Quasi-Co-Location (QCL), QCL assumption, etc. may be read as interchangeable.

[0227] In the present disclosure, TPMI and TPMI index may be interchangeable. Port and antenna port may be interchangeable. 8TX (8 transmissions) may mean 8 ports and 8 antenna ports. Port / antenna port may mean a port / antenna port for UL (e.g., SRS / PUSCH) transmission. In the present disclosure, SRS resource set and resource set may be interchangeable. Coherent group and SRS resource set may be interchangeable.

[0228] This disclosure mainly describes 3 Tx, but the same applies to 4 or more Tx, 2 or less Tx, etc. In the following embodiments, "3" may be read as "n (n is any integer)," and in this case, those skilled in the art can appropriately read the number of layers / ports, etc., described assuming that the maximum value is "3," assuming that the maximum value is "n."

[0229] It should be noted that in this disclosure, "having the capability of..." may be read interchangeably as "supporting / reporting the capability of...".

[0230] In the present disclosure, the terms rank, transmission rank, number of layers, and number of antenna ports may be interchangeable. Furthermore, the terms "one codeword is applied" and "the number of layers is four or less" may be interchangeable. The terms "two codewords are applied" and "the number of layers is greater than four" may be interchangeable.

[0231] In the present disclosure, a table may be read interchangeably as one or more tables.

[0232] In the present disclosure, distribution, division, and division may be read interchangeably.

[0233] In the present disclosure, the terms drop, abort, cancel, puncture, rate match, postpone, do not transmit, etc. may be read interchangeably.

[0234] Furthermore, the DCI in the following embodiments may refer to a DCI that schedules at least one of a PUSCH and a PDSCH (for example, DCI format 0_x, 1_x (where x is an integer)). Furthermore, the following embodiments are based on the premise of codebook-based transmission (PUSCH), but are not limited thereto.

[0235] In the present disclosure, the association between the precoding information (TPMI) and the number of layers (TRI) and the index (precoding information field value) may be defined in Specification 2 for Multiplexing and Channel Coding (Multiplexing and Channel Coding / Downlink Transport Channels and Control Information / Downlink Control Information / DCI Formats / DCI Format 0_1). In the present disclosure, the association, Table D-x, TRI / TPMI indication table, DCI indication table, and precoding information table may be interchangeable.

[0236] In the present disclosure, the terms precoding matrix and precoder may be interpreted as interchangeable.

[0237] In the following embodiments, the precoding matrix / precoder may refer to a non-coherent precoder.

[0238] In the present disclosure, 3 ports, 3 Tx, and 3 antenna ports may be read interchangeably, i.e., in the present disclosure, ports, Tx, and antenna ports may be used interchangeably.

[0239] In the present disclosure, 3-port PUSCH transmission, 3Tx PUSCH transmission, and PUSCH transmission using three antenna ports may be interpreted as interchangeable.

[0240] In the present disclosure, the magnitude relationship of resources / resource sets / resource groups associated with an SRS is expressed as resource < resource group < resource set, but is not limited to this.

[0241] In each of the following embodiments, a number (e.g., 0, 1, 2, etc.) corresponding to a certain index (e.g., TPMI index, antenna port index, etc.) may be replaced with a number with a # (e.g., #0, #1, #2, etc.).

[0242] In the present disclosure, the UE may be configured / instructed to use a codebook (codebook subset) for a 3Tx UE.

[0243] In the present disclosure, SRS setting and SRS antenna switching setting may be read interchangeably.

[0244] In the present disclosure, parameters (capabilities) related to the number of antenna ports available for reception / transmission, existing UE capabilities, new UE capabilities (parameters), parameters related to SRS resource [set], parameters related to resource type, srs-AntennaSwitching2SP-1Periodic, srs-ExtensionAperiodicSRS, srs-OneAP-SRS, etc. may be read interchangeably.

[0245] (Wireless Communication Method) The embodiments of the present disclosure can be broadly categorized as follows: First embodiment: Splitting / distribution of SRS transmission power in 3Tx PUSCH transmission. Second embodiment: Scaling of PUSCH transmission power in 3Tx PUSCH transmission (4-port SRS). Third embodiment: Scaling of PUSCH transmission power in 3Tx PUSCH transmission ({2,1}-port SRS / {1,1,1}-port SRS). Each embodiment will be described below based on these.

[0246] The UE may perform UL transmission control (SRS power control) by applying the operations of each embodiment described later. The NW / BS / gNB may provide / transmit to the UE settings / instructions etc. for the UE to realize the control.

[0247] In the present disclosure, the configuration / instruction for the SRS may be performed in units of resource sets or in units of resources. That is, in the present disclosure, the resource sets and resources may be read as interchangeable.

[0248] In the present disclosure, the setting / instruction for the SRS may be in CC units or in BWP units, i.e., CC and BWP may be interchangeable.

[0249] In the present disclosure, each embodiment / option may be applied alone or in combination with other embodiments / options.

[0250] In the present disclosure, the association between the precoding matrix W and the TPMI index may be defined in Specification 1 for Physical Channels and Modulation (Physical channels and modulation / Uplink / Physical channels / Physical uplink shared channel / Precoding). In the present disclosure, the association, table P-x, TMPI table, precoding matrix table, and precoder table may be interchangeable.

[0251] For example, for one SRS resource set whose usage is set in the codebook, possible configurations of the SRS resources (correspondence between resource sets / resources) may be at least one of the following patterns (which may also be referred to as configuration patterns): That is, the UE may control UL transmission (transmission of PUSCH / SRS) based on the following patterns:

[0252] 9A to 9D are conceptual diagrams showing the correspondence between resource sets and resources (patterns 1 to 4) in a codebook for 3Tx UE, where Fig. 9A corresponds to pattern 1, Fig. 9B corresponds to pattern 2, Fig. 9C corresponds to pattern 3, and Fig. 9D corresponds to pattern 4.

[0253] <Pattern 1> One 1-port SRS resource and one 2-port SRS resource are associated with one SRS resource set, i.e., one SRS resource set includes one 1-port SRS resource and one 2-port SRS resource (see FIG. 9A ).

[0254] <Pattern 2> Three one-port SRS resources are associated with one SRS resource set. That is, one SRS resource set includes three one-port SRS resources #1 to #3 (see FIG. 9B).

[0255] <Pattern 3> Two one-port SRS resources and two two-port SRS resources are associated with one SRS resource set, i.e., one SRS resource set includes two one-port SRS resources and two two-port SRS resources.

[0256] In Pattern 3, the multiple (four) SRS resources are divided (subset) into multiple (two) groups, which may be referred to as SRS resource groups.

[0257] Each group (SRS resource group) includes two SRS resources (one one-port SRS resource and one two-port SRS resource). For example, one group (SRS resource group #1, which may be referred to as the first group) may have a first one-port SRS resource (one-port SRS resource #1) and a first two-port SRS resource (two-port SRS resource #1), and the other group (SRS resource group #2, which may be referred to as the second group) may have a second one-port SRS resource (one-port SRS resource #2) and a second two-port SRS resource (two-port SRS resource #2) (see FIG. 9C ).

[0258] <Pattern 4> Six one-port SRS resources are associated with one SRS resource set. That is, one SRS resource set includes six one-port SRS resources #1 to #6.

[0259] In Pattern 4, a plurality of (six, e.g., a multiple of three (3N)) SRS resources are divided (subset) into a plurality of (two, e.g., N) groups. The plurality of groups may be called SRS resource groups.

[0260] Each group (SRS resource group) includes three SRS resources (three one-port SRS resources). For example, one group (SRS resource group #1, which may be referred to as the first group) may include first to third one-port SRS resources (one-port SRS resources #1 to #3), and the other group (SRS resource group #2, which may be referred to as the second group) may include fourth to sixth one-port SRS resources (one-port SRS resources #4 to #6) (see FIG. 9D).

[0261] As shown in the above-described patterns 1 to 4, multiple (two or more) SRS resources may be associated with one SRS resource set. That is, one SRS resource set may include multiple (two or more) SRS resources (e.g., 2 to 6).

[0262] In particular, in patterns 3 and 4, multiple SRS resources in one SRS resource set may configure / form multiple groups (the above-mentioned SRS resource groups), where each group may include at least two (multiple) SRS resources.

[0263] The following embodiments may be applied to UL transmission control based on the above-mentioned patterns 1 to 4.

[0264] In the present disclosure, division (allocation) of SRS transmission power and scaling of PUSCH transmission power may be read interchangeably.

[0265] In the present disclosure, the maximum number of SRS ports and the maximum number of SRS ports may be read interchangeably.

[0266] First Embodiment The first embodiment relates to distribution of SRS transmission power in 3Tx PUSCH transmission.

[0267] The UE may control the distribution (division) of the SRS transmission power according to the configured SRS resource type (number of ports) / supported UE capability. Specifically, the UE may control the distribution (division) of the SRS transmission power based on at least one of Options 1 and 2 shown below.

[0268] [Option 1] If at least one of the following conditions 1 to 3 is met, the UE may divide the SRS transmission power according to the number of ports configured for SRS. <Condition 1> The UE is configured for 3Tx PUSCH transmission and a 4-port SRS resource is configured for UL channel sounding. <Condition 2> The UE reports the capability to support 3Tx UL transmission (capability to support 4-port SRS and the configuration in which one of the 4 ports is muted). <Condition 3> The UE is configured by higher layer signaling (RRC) to enable 3Tx UL transmission (the configuration in which one of the 4 ports is muted).

[0269] Specifically, if at least one of the above conditions 1 to 3 is met, the UE may equally divide the transmission power among the number of ports set for SRS (i.e., four ports).

[0270] In this case, since the transmission power is divided into four, the same power amplification (power amplifier) ​​as that supported by a normal 4-port SRS is sufficient, and therefore, it is possible to reduce the impact on the hardware configuration of the UE.

[0271] [Option 2] If a UE is configured for 3Tx PUSCH transmission and a 4-port SRS resource is configured for UL channel sounding, the UE may divide the transmit power among the number of ports it supports, i.e., 3. That is, if the above condition 1 is satisfied, the UE may equally divide the SRS transmit power into 3 parts.

[0272] In this case, no transmission power may be allocated to the remaining configured port, i.e., the UE divides the total transmission power for the four ports among the three ports.

[0273] By equally allocating one-third of the transmission power for four ports to three ports, the SRS transmission power per port can be maximized. In other words, by distributing the power originally allocated for four ports to three ports, it is possible to allocate power efficiently without wasting one port.

[0274] [UE Capability] A UE may report its capability to support at least one of the above-mentioned Options 1 and 2 for splitting the transmission power of SRS. That is, the UE may determine the application of the above-mentioned Options 1 and 2 according to the reported capability. In other words, if the UE reports its capability to support Options 1 and 2, it may apply the corresponding option to control the transmission power [splitting] of SRS.

[0275] The UE may also be configured by the NW via specific higher layer signaling to apply the above-mentioned options 1 to 2 to the division of the SRS transmission power.

[0276] According to this embodiment, the UE can appropriately control the division of the SRS transmission power.

[0277] Second Embodiment The second embodiment relates to scaling of PUSCH transmission power in 3Tx PUSCH transmission (4-port SRS).

[0278] [Capability Reporting] When a UE reports its capability to support 3Tx UL transmission (capability to support 4-port SRS and one of the four ports being muted), the UE may further report capabilities corresponding to at least one of the following cases 1-2:

[0279] (Case 1) The UE supports 4-port SRS and one of the four ports is muted. The UE does not support 4-port SRS and all configured ports are transmitted (i.e., none of the ports are muted).

[0280] (Case 2) The UE supports 4-port SRS and one of the four ports is muted. The UE supports 4-port SRS and all configured ports are transmitted (i.e., none of the ports are muted).

[0281] (Variant) If the UE reports neither of the above cases 1 nor 2, but instead reports the capability to support 3Tx UL transmission (the capability to support 4-port SRS and a configuration in which one of the four ports is muted), this may mean reporting case 1.

[0282] [Scaling of PUSCH Transmission Power] When at least one of the following conditions A and B (corresponding to conditions 2 and 3 in the first embodiment) is met, the UE may scale the PUSCH transmission power by applying at least one of the following options 1 and 2. <Condition A> The UE reports the capability to support 3Tx UL transmission (the capability to support 4-port SRS and the configuration in which one port out of the four ports is muted). <Condition B> The UE is configured by higher layer signaling (RRC) to enable 3Tx UL transmission (the configuration in which one port out of the four ports is muted).

[0283] (Option 1) The UE may scale the PUSCH transmission power according to the ratio of the number of antenna ports with non-zero PUSCH transmission power to the maximum number of SRS ports supported by the UE in one SRS resource.

[0284] Here, the maximum number of SRS ports supported by the UE is the maximum number of configurable SRS ports, for example, the maximum number of SRS ports may be four.

[0285] (Option 2) The UE may scale the PUSCH transmission power according to the ratio of the number of antenna ports with non-zero PUSCH transmission power to the maximum number of SRS ports supported by the UE in one SRS resource.

[0286] Here, the maximum number of SRS ports supported by the UE may be the maximum number of SRS ports that can actually transmit (non-zero power / non-muted).

[0287] (Other) Different options may be applied depending on the above-mentioned capability reporting cases 1 and 2. For example, option 1 may be applied when case 1 is reported, and option 2 may be applied when case 2 is reported.

[0288] The UE may report the capability to support options 1-2 for scaling the PUSCH transmit power.

[0289] The UE may also be configured by the network via specific higher layer signaling to apply the above-mentioned options 1 to 2 to scaling of the PUSCH transmission power.

[0290] According to this embodiment, the UE can appropriately control the scaling of the PUSCH transmission power.

[0291] <Third Embodiment> The third embodiment relates to scaling of PUSCH transmission power ({2,1}-port SRS / {1,1,1}-port SRS) in 3Tx PUSCH transmission.

[0292] In the present disclosure, the {2,1}-port SRS and the {2+1}-port SRS may be interchangeable. Also, the {2,1}-port SRS / {2+1}-port SRS may mean including a 2-port SRS#1+1-port SRS#2 (having one 1-port SRS and one 2-port SRSR) (the indexes may be reversed).

[0293] In the present disclosure, the {1,2}-port SRS and the {1+2}-port SRS may be interchangeable. Also, the {1,2}-port SRS / {1+2}-port SRS may mean including a 1-port SRS#1+2-port SRS#2 (having one 2-port SRS and one 1-port SRSR) (the indexes may be reversed). That is, the {2,1}-port SRS / {2+1}-port SRS and the {1,2}-port SRS / {1+2}-port SRS may be interchangeable.

[0294] In the present disclosure, a {1,1,1}-port SRS and a {1+1+1}-port SRS may be interchangeable. A {1,1,1}-port SRS / {1+1+1}-port SRS may mean including three 1-port SRSs.

[0295] [Capability Reporting] When a UE reports its capability to support 3Tx UL transmission (capability to support the configuration of {2+1}-port SRS / {1+1+1}-port SRS), the UE may further report capabilities corresponding to at least one of the following cases 1 to 2:

[0296] (Case 1) The UE supports the configuration of {2+1}-port SRS / {1+1+1}-port SRS, but does not support the configuration of 4-port SRS.

[0297] (Case 2) The UE supports the configuration of {2+1}-port SRS / {1+1+1}-port SRS, and also supports the configuration of 4-port SRS.

[0298] (Variation 1) The UE may determine to apply either of the above-described cases 1 and 2 depending on the maximum number of SRS ports it supports. For example, if the UE reports that the maximum number of SRS ports is 2, this may mean that it supports case 1. Also, if the UE reports that the maximum number of SRS ports is 4, this may mean that it supports case 2.

[0299] (Variation 2) If the UE does not report any of the above cases 1 and 2, but instead reports its ability to support 3Tx UL transmission (ability to support the configuration of {2+1}-port SRS / {1+1+1}-port SRS), this may mean that it reports case 1.

[0300] [Scaling of PUSCH Transmission Power] When at least one of the following conditions A and B is satisfied, the UE may scale the PUSCH transmission power by applying at least one of the following options 1 and 2 (which may include variations): <Condition A> The UE reports the capability to support 3Tx UL transmission (the capability to support the configuration of {2+1}-port SRS / {1+1+1}-port SRS). <Condition B> The UE is configured by higher layer signaling (RRC) to enable 3Tx UL transmission (the configuration of {2+1}-port SRS / {1+1+1}-port SRS).

[0301] (Option 1) The UE may scale the PUSCH transmit power according to the ratio of the number of antenna ports with non-zero PUSCH transmit power to the maximum number of total SRS ports (e.g., 3) supported by the UE [of one SRS resource set / multiple SRS resources]. That is, the UE may scale the PUSCH transmit power by dividing the number of antenna ports with non-zero PUSCH transmit power by 3.

[0302] (Option 2) The UE may scale the PUSCH transmit power according to the ratio of the number of antenna ports with non-zero PUSCH transmit power to the maximum total number of SRS ports (e.g., 4 ports) in an SRS resource set / multiple SRS resources that can be configured regardless of the UE capability. That is, the UE may scale the PUSCH transmit power by dividing the number of antenna ports with non-zero PUSCH transmit power by 4.

[0303] (Variation 1) The UE may scale the PUSCH transmission power according to the ratio of the number of antenna ports with non-zero PUSCH transmission power to the maximum number of SRS ports (e.g., 2) that the UE supports (within one SRS resource). That is, the UE may scale the PUSCH transmission power by dividing the number of antenna ports with non-zero PUSCH transmission power by 2.

[0304] (Other) Different options may be applied depending on the above-mentioned capability reporting cases 1 and 2. For example, option 1 may be applied when case 1 is reported, and option 2 may be applied when case 2 is reported.

[0305] The UE may report the capability to support options 1-2 for scaling the PUSCH transmit power.

[0306] (Variation 2) A new candidate value of "3" may be introduced as the maximum number of SRS ports in one SRS resource (UE capability). When the UE reports that the maximum number of SRS ports is 3, the UE may scale the PUSCH transmission power by the ratio of the number of antenna ports with non-zero PUSCH transmission power to the maximum number of SRS ports (e.g., 3) that the UE supports in one SRS resource. That is, the UE may scale the PUSCH transmission power by dividing the number of antenna ports with non-zero PUSCH transmission power by 3.

[0307] The above-mentioned variant example 2 may be applied when a 4-port SRS is set and one of the four ports is muted (i.e., the second embodiment), or when a {2+1}-port SRS / {1+1+1}-port SRS is set (i.e., the present embodiment).

[0308] According to this embodiment, the UE can appropriately control the scaling of the PUSCH transmission power.

[0309] <Example of technical document description> (Issue): SRS [Analysis] It was agreed that at least one of the following options 1 and 2 will be selected. (Option 1) In one SRS resource set, the configuration of X 4-port SRS resources with one port muted is supported. (Option 2) In one SRS resource set, the configuration of X SRS resources with the same / different number of ports (2+1 ports / 1+1+1 ports) is supported.

[0310] Option 1 minimizes the impact on the specifications.

[0311] On the other hand, Option 2 requires further discussion. The following are the points to be considered.

[0312] - Whether multiple SRS resources are transmitted in overlapping resource elements (REs), whether FDM / TDM is supported, or whether both FDM and TDM are supported. - SRI indication. - In existing power control, the transmit power is distributed equally across all ports. When multiple SRS resources are used, there may be cases where equal power is required across all ports for the NW to measure and determine the precoding matrix. Further discussion is needed to realize this.

[0313] Considering the impact on specifications, Option 1 is preferable. Therefore, we propose the following.

[0314] In one SRS resource set, a configuration of X 4-port SRS resources with one port muted is supported.

[0315] If one port for a given four-port SRS resource is muted, the transmit power of the SRS may be divided equally among the three SRS ports.

[0316] <Supplementary Information> <<Notification of Information to UE>> In the above-described embodiments, notification of any information to the UE [from a Network (NW) (e.g., a Base Station (BS))] (in other words, reception of any information from the BS by the UE) may be performed using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.

[0317] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader, which is not defined in existing standards.

[0318] When the notification is made by DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0319] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0320] <<Notification of Information from UE>> In the above-described embodiments, notification of any information from the UE [to the NW] (in other words, transmission / report of any information from the UE to the BS) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal / channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.

[0321] When the notification is performed by a MAC CE, the MAC CE may be identified by including a new LCID, which is not defined in existing standards, in the MAC subheader.

[0322] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0323] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0324] <<Regarding Application of Each Embodiment>> In a UE / BS, specific (one or more) processes / operations / controls / assumptions / information for at least one of the above-mentioned embodiments may be applied (used) when one or more of the following conditions are met: - a higher layer parameter indicating the specific processes / operations / controls / assumptions / information is configured; - the specific processes / operations / controls / assumptions / information is determined based on related higher layer parameters; - the specific processes / operations / controls / assumptions / information is specified / activated / triggered by a MAC CE / DCI / UCI / resource / channel / RS; - a specific UE capability indicating (or related to) the specific processes / operations / controls / assumptions / information is reported or supported; - the application of the specific processes / operations / controls / assumptions / information is determined based on specific conditions.

[0325] The specific UE capabilities may indicate at least one of the following: Supporting specific processing / operations / control / assumptions / information for at least one of the above embodiments; Supporting 3Tx UL (PUSCH) transmission; Supporting multiple different antenna layouts / number of antenna groups; Supporting coherent groups; Supporting both 3Tx UL transmission and MTRP PUSCH transmission; Supporting association between PTRS and DMRS ports; Supporting SRS transmit power distribution in 3Tx PUSCH transmission.

[0326] Furthermore, the above-mentioned specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (e.g., one or a combination of a cell, a band, a band combination, a BWP, a component carrier, etc.), or may be a capability for each frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or may be a capability for each subcarrier spacing (SubCarrier Spacing (SCS)), or may be a capability for each Feature Set (FS) or Feature Set Per Component-carrier (FSPC).

[0327] Furthermore, the specific UE capability may be a capability that is applied to all duplexing methods (commonly regardless of the duplexing method), or may be a capability for each duplexing method (e.g., Time Division Duplex (TDD) or Frequency Division Duplex (FDD)).

[0328] If the above conditions are not met, the UE / BS may follow the behavior specified in existing 3GPP releases.

[0329] (Supplementary Notes) The following inventions are supplementary notes with respect to an embodiment (first to third embodiments) of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiver unit that receives a measurement reference signal (SRS) resource configuration for uplink (UL) transmission using three antenna ports (3Tx); and a controller that controls division of SRS transmission power or scaling of physical uplink shared channel (PUSCH) transmission power based on the type of SRS resource that is configured and the number of supported SRS ports. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein, when a four-port SRS resource is configured and one of the four ports is muted, the controller controls division of the SRS transmission power based on the number of ports configured for SRS or the number of supported ports. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein, when reporting that a 4-port SRS resource is configured and one of the four ports is muted, the controller scales the PUSCH transmission power by a ratio of the number of antenna ports with non-zero PUSCH transmission power to a maximum number of supported SRS ports. [Supplementary Note 4] The terminal according to any of Supplementary Note 1 to Supplementary Note 3, wherein, when reporting that a 4-port SRS resource is configured and one of the four ports is muted, the controller scales the PUSCH transmission power by a ratio of the number of antenna ports with non-zero PUSCH transmission power to a maximum number of supported SRS ports.

[0330] (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.

[0331] 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 (which may be simply referred to as 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).

[0332] 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.

[0333] 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.

[0334] 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))).

[0335] 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.

[0336] 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).

[0337] 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.

[0338] 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.

[0339] 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.

[0340] 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.

[0341] The core network 30 may include network functions (Network Functions (NF)) such as a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM). A single network node may provide multiple functions. Communication with an external network (e.g., the Internet) may also be performed via the DN.

[0342] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0343] 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).

[0344] 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.

[0345] 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.

[0346] 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.

[0347] 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).

[0348] 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.

[0349] 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.

[0350] 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.

[0351] 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.

[0352] 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.

[0353] 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.

[0354] 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.

[0355] 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.

[0356] 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).

[0357] 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.

[0358] 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.

[0359] 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.

[0360] 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.

[0361] 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.

[0362] 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.

[0363] 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.

[0364] 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.

[0365] 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.

[0366] 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.

[0367] 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.

[0368] 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.

[0369] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.

[0370] 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.

[0371] 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.

[0372] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes that provide NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0373] The transmitter and receiver of the base station 10 in the present disclosure may be configured by at least one of the transmitter / receiver 120, the transmitter / receiver antenna 130, and the transmission path interface 140.

[0374] The transceiver 120 may transmit a measurement reference signal (SRS) resource configuration for uplink (UL) transmission using three antenna ports (3Tx). The controller 110 may control reception of UL transmission from a terminal by controlling division of SRS transmission power or scaling of physical uplink shared channel (PUSCH) transmission power based on the configured SRS resource type and the number of supported SRS ports.

[0375] (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.

[0376] 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.

[0377] 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.

[0378] 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.

[0379] 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.

[0380] 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.

[0381] 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.

[0382] 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.

[0383] 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.

[0384] 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.

[0385] 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.

[0386] 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.

[0387] 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.

[0388] 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.

[0389] 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.

[0390] 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.

[0391] The measurement unit 223 may derive channel measurements for CSI calculation based on the channel measurement resources. The channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources. The measurement unit 223 may also derive interference measurements for CSI calculation based on the interference measurement resources. The interference measurement resources may be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, etc. Note that CSI-IM may be referred to as CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS. Note that in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeably read as interchangeable.

[0392] 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.

[0393] The transceiver 220 may receive a measurement reference signal (SRS) resource configuration for uplink (UL) transmission using three antenna ports (3Tx). The controller 210 may control division of the SRS transmission power or scaling of the physical uplink shared channel (PUSCH) transmission power based on the type of configured SRS resource and the number of supported SRS ports. When a four-port SRS resource is configured and one of the four ports is muted, the controller 210 may control division of the SRS transmission power according to the number of ports configured for SRS or the number of supported ports. When a four-port SRS resource is configured and reports that one of the four ports is muted, the controller 210 may scale the PUSCH transmission power according to the ratio of the number of antenna ports with non-zero PUSCH transmission power to the maximum number of supported SRS ports. When reporting support for the configuration of {2+1}-port SRS or {1+1+1}-port SRS, the control unit 210 may scale the PUSH transmission power according to the ratio of the number of antenna ports with non-zero PUSH transmission power to the maximum total number of SRS ports supported in multiple SRS resources.

[0394] (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.

[0395] 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.

[0396] 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.

[0397] 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.

[0398] 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.

[0399] 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.

[0400] 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.

[0401] 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.

[0402] 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.

[0403] 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.

[0404] 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.

[0405] 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).

[0406] 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.

[0407] 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.

[0408] (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.

[0409] 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.

[0410] 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.

[0411] 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.

[0412] 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.

[0413] 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.

[0414] 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.

[0415] 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.

[0416] 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.

[0417] 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.

[0418] 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.

[0419] 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.

[0420] 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.

[0421] 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.

[0422] 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.

[0423] 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.

[0424] 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.

[0425] 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.

[0426] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0427] 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.

[0428] 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.

[0429] 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.

[0430] 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.

[0431] 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.

[0432] 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.

[0433] 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.

[0434] 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).

[0435] 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).

[0436] 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).

[0437] 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.

[0438] 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.

[0439] 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).

[0440] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "layer," "number of layers," "rank," "resource," "resource set," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "UE panel," "transmitting entity," "receiving entity," etc. may be used interchangeably.

[0441] In the present disclosure, the term "antenna port" may be interchangeably read as an antenna port for any signal / channel (e.g., a demodulation reference signal (DMRS) port). In the present disclosure, the term "resource" may be interchangeably read as a resource for any signal / channel (e.g., a reference signal resource, an SRS resource, etc.). The resource may include time / frequency / code / space / power resources. Furthermore, the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0442] The group may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0443] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable terms.

[0444] In addition, in the present disclosure, the terms TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, etc. may be read interchangeably.

[0445] Furthermore, in the present disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) property," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

[0446] In the present disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interchangeable. In the present disclosure, terms such as sequence, list, set, group, cluster, and subset may be interchangeable.

[0447] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information (TCI state)" may be interchangeable with "set of spatial relationship information (TCI state)", "one or more pieces of spatial relationship information", etc. The TCI state and the TCI may be interchangeable. The spatial relationship information and the spatial relationship may be interchangeable.

[0448] 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.

[0449] 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.

[0450] In the present disclosure, a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control / operate based on the information.

[0451] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0452] 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.

[0453] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.

[0454] The mobile body is a movable object that can move at any speed and naturally includes cases where the mobile body is stationary. Examples of the mobile body include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcars, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon. The mobile body may also be a mobile body that moves autonomously based on an operation command.

[0455] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Note that 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.

[0456] 14 is a diagram showing an example of a vehicle according to an embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0457] The drive unit 41 is configured with at least one of an engine, a motor, and a hybrid of an engine and a motor, for example. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by a user.

[0458] The electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0459] The signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheels 46 / rear wheels 47 obtained by a rotation speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0460] The information service unit 59 is composed of various devices, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information acquired from external devices via the communication module 60 or the like to provide various information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0461] The information service unit 59 may include input devices (e.g., keyboards, mice, microphones, switches, buttons, sensors, touch panels, etc.) that accept input from the outside, and may also include output devices (e.g., displays, speakers, LED lamps, touch panels, etc.) that output to the outside.

[0462] The driving assistance system unit 64 includes various devices for providing functions to prevent accidents and reduce the driver's driving burden, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Units (IMUs), Inertial Navigation Systems (INSs)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driving assistance functions or autonomous driving functions.

[0463] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) via the communication port 63 to and from the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58, which are provided in the vehicle 40.

[0464] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Furthermore, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (or may function as at least one of the base station 10 and the user terminal 20).

[0465] The communication module 60 may transmit at least one of signals from the above-mentioned various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above-mentioned input.

[0466] The communication module 60 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle. The information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0467] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided in the vehicle 40.

[0468] 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, "sidelink"). For example, terms such as an uplink channel and a downlink channel may be read as a sidelink channel.

[0469] 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.

[0470] 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.

[0471] 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.

[0472] 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 (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 802. The present invention may be applied to systems that use IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication methods, or to next-generation systems that are expanded, modified, created, or defined based on these. Furthermore, the present invention may be applied to a combination of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0473] 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."

[0474] 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.

[0475] 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.

[0476] 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.

[0477] Furthermore, "determination" may be considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "determining" some kind of action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0478] Furthermore, in this disclosure, "determine / determining" may be interchangeably read as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "does not expect to do..." may be interchangeably read as "assumes not to do...."

[0479] In the present disclosure, "expect" may be interchangeably read as "be expected." For example, "expect(s) ..." ("..." may be expressed, for example, as a that clause, a to-infinitive, etc.) may be interchangeably read as "be expected ...." "does not expect ..." may be interchangeably read as "be not expected ...." Furthermore, "An apparatus A is not expected ..." may be interchangeably read as "an apparatus B other than apparatus A does not expect ... from apparatus A" (e.g., if apparatus A is a UE, apparatus B may be a base station).

[0480] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0481] 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."

[0482] 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.

[0483] 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."

[0484] 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.

[0485] 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.

[0486] In the present disclosure, terms such as "less than or equal to," "less than," "greater than," "more than," "equal to," etc. may be interchangeable. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative. Furthermore, in the present disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "fast," "slow," "wide," "narrow," etc. may be interchangeable, not limited to the positive, comparative, and superlative, as expressions with "i-th" (i is any integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0487] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0488] In the present disclosure, terms such as "when A, B," "if A, (then) B," "B upon A," "B in response to A," "B based on A," "B during / while A," "B before A," "B at (the same time as) / on A," "B after A," "B since A," and "B until A" may be interchangeable. Note that A, B, and the like herein may be replaced with appropriate expressions such as nouns, gerunds, and regular sentences, depending on the context. Note that the time difference between A and B may be approximately zero (immediately after or immediately before). A time offset may also be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after a time offset at which A occurs." The time offset (eg, one or more symbols / slots) may be predefined or may be specified by the UE based on signaled information.

[0489] In the present disclosure, timing, time, duration, time instance, any time unit (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc. may be read interchangeably.

[0490] 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 description of the present disclosure is for illustrative purposes only and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A terminal having: a receiving unit that receives measurement reference signal (SRS) resource configuration for uplink (UL) transmission using three antenna ports (3Tx); and a control unit that controls division of SRS transmission power or scaling of physical uplink shared channel (PUSCH) transmission power based on the type of SRS resource to be configured and the number of supported SRS ports.

2. The terminal according to claim 1, wherein when a four-port SRS resource is configured and one of the four ports is muted, the control unit controls division of the SRS transmission power according to the number of ports configured for SRS or the number of ports supported.

3. The terminal according to claim 1, wherein, when a four-port SRS resource is configured and one of the four ports is reported to be muted, the control unit scales the PUSCH transmission power according to a ratio of the number of antenna ports whose PUSCH transmission power is not zero to the maximum number of supported SRS ports.

4. The terminal according to claim 1, wherein, when reporting support for the configuration of {2+1}-port SRS or {1+1+1}-port SRS, the control unit scales the PUSCH transmission power according to a ratio of the number of antenna ports with non-zero PUSCH transmission power to the maximum number of total SRS ports supported in multiple SRS resources.

5. A wireless communication method for a terminal, comprising: a step of receiving a measurement reference signal (SRS) resource configuration for uplink (UL) transmission using three antenna ports (3Tx); and a step of controlling division of SRS transmission power or scaling of physical uplink shared channel (PUSCH) transmission power based on the type of SRS resource configured and the number of supported SRS ports.

6. A base station comprising: a transmitter that transmits measurement reference signal (SRS) resource configuration for uplink (UL) transmission using three antenna ports (3Tx); and a base station that controls reception of UL transmission from a terminal by controlling division of SRS transmission power or scaling of physical uplink shared channel (PUSCH) transmission power based on the type of SRS resource that is configured and the number of SRS ports that are supported.

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