Terminal, wireless communication method, and base station

Abstract

A terminal according to one aspect of the present disclosure comprises: a reception unit that receives precoding information indicating a precoder for uplink (UL) transmission; and a control unit that determines, on the basis of the precoding information, a subband precoder to be applied for each subband.

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] UL subband precoding (also called frequency selective precoding) has been considered since Rel. 18. However, various rules for realizing this have not yet been fully clarified. If these rules are not clearly defined, there is a risk that UL transmission using subband precoding cannot be appropriately controlled.

[0006] 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.

[0007] A terminal according to one aspect of the present disclosure has a receiving unit that receives precoding information indicating a precoder for uplink (UL) transmission, and a control unit that determines a subband precoder to be applied for each subband based on the precoding information.

[0008] According to one aspect of the present disclosure, UL transmission can be appropriately controlled.

[0009] 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] Fig. 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. Fig. 6 is a diagram showing an example of a correspondence relationship between field values ​​of precoding information and number of layers, and the number of layers and TPMI in Rel. 16 NR. Figs. 7A to 7C are diagrams showing an SRI indication or a second SRI indication when transmitting a codebook-based PUSCH in Rel. 17. Fig. 8 is a diagram showing an example of an antenna layout for eight antenna ports. Figs. 9A and 9B are diagrams showing an example of frequency selective precoding. Fig. 10 is a diagram showing an example of a correspondence relationship between bandwidth size and RBG size (e.g., reference value). Fig. 11 is a diagram showing another example of frequency selective precoding. Fig. 12 is a diagram showing an example of frequency selective precoding according to embodiment 1-1. Fig. 13 is a diagram showing an example of frequency selective precoding according to embodiment 1-1. Fig. 14 is a diagram showing an example of frequency selective precoding according to embodiment 1-1. FIG. 15 is a diagram illustrating an example of frequency selective precoding according to embodiment 1-1A.FIG. 16 is a diagram illustrating an example of a correspondence relationship between an applicable precoder and a 2TX precoder according to the present disclosure. FIG. 17 is a diagram illustrating an example of frequency selective precoding according to embodiment 1-1B. FIG. 18 is a diagram illustrating an example of frequency selective precoding according to a fourth embodiment. FIG. 19 is a diagram illustrating an example of frequency selective precoding according to the fourth embodiment. FIG. 20 is a diagram illustrating an example of a correspondence relationship between DCI and the rank / number of layers of a PUSCH according to the fourth embodiment. FIG. 21 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 22 is a diagram illustrating an example of a configuration of a base station according to an embodiment. FIG. 23 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. FIG. 24 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to an embodiment. FIG. 25 is a diagram illustrating an example of a vehicle according to an embodiment.

[0010] (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)).

[0011] 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").

[0012] 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).

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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).

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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).

[0028] 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.

[0029] 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.

[0030] 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."

[0031] 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.

[0032] (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.

[0033] 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.

[0034] 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.

[0035] 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").

[0036] 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.

[0037] 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").

[0038] 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."

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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).

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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).

[0049] 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).

[0050] 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).

[0051] 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.

[0052] 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.

[0053] 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).

[0054] 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.

[0055] 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.

[0056] 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).

[0057] 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).

[0058] 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.

[0059] (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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] (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 SRS7C 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.

[0066] 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.

[0067] When the upper layer parameter txConfig=codebook, the SRS resource indicator field is [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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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".

[0074] 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.

[0075] (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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] It should be noted that the antenna layout is not limited to the example shown in Fig. 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 example shown in Fig. 8. dG-H and dG-V represent the horizontal spacing and vertical spacing, respectively, between the centers of adjacent antenna groups.

[0081] 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.

[0082] 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.

[0083] 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.).

[0084] (UL Subband Precoding) In Rel. 18 NR and later, when UL transmission (e.g., PUSCH transmission) is performed, it is assumed that UL subband precoding (or frequency selective precoding) that applies multiple precodings in the frequency domain will be supported. Frequency selective precoding may be read as subband precoding, separate precoding, frequency group precoding, or frequency direction precoding.

[0085] That is, it is assumed that application of precoding is controlled based on a predetermined frequency unit. The frequency region may be interpreted as a frequency domain or a frequency direction. The frequency unit may be interpreted as a frequency resource unit, a subband unit, a frequency portion unit, or a bandwidth unit.

[0086] In this case, how to configure / indicate subband precoding (e.g., precoding PMI) of a CB-based PUSCH (e.g., CB-based PUSCH) becomes an issue.

[0087] Therefore, it is necessary to clarify the details of the operation for controlling the application of precoding based on a predetermined frequency unit.

[0088] <Conditions for Frequency Selective Precoding> The following describes conditions / rules / parameters for controlling precoding in the frequency direction when frequency selective precoding (for example, frequency selective precoding) is supported / configured for UL transmission of PUSCH and the like.

[0089] When frequency selective precoding is supported / configured, at least one of the following options 1-1 to 1-3 may be applied as a condition / rule / parameter for precoding control in the frequency direction.

[0090] The following options may be applied to CB-based transmission for one or multiple (e.g., two) CW / TB PUSCHs. If there are multiple (e.g., two) CW / TBs, the same configuration may be applied to the two CW / TBs, or different configurations may be applied to the two CW / TBs.

[0091] [Option 1-1] The granularity (or level) of frequency selective precoding for UL transmission may be defined / configured. The granularity of precoding may be at least one of a predetermined subcarrier unit, a predetermined resource block (RB) unit, a predetermined physical resource block (PRB) unit, a predetermined resource block group (RBG) unit, a predetermined subband unit, and a precoding resource block group (PRG) unit.

[0092] The granularity of precoding to be applied may be predefined in a specification, or may be set in the UE by a higher layer parameter or the like. Furthermore, a reference value (e.g., X) when applying a certain granularity may be predefined in a specification, or may be set by a higher layer parameter. For example, when an RBG unit (reference value (X)) is set, precoding may be applied separately for each of X RBGs. The reference value X may be determined based on UE capabilities (e.g., UE capability).

[0093] 9A shows an example of a case where the granularity of precoding is set to RBG units (here, 4 RBGs (reference value 4)). In this case, precoding may be applied / configured separately for every 4 RBGs in PUSCH transmission.

[0094] Aspect 1-1: The granularity of subband precoding may be defined in a specification for a predetermined condition / parameter. The predetermined condition / parameter may be at least one of a certain bandwidth (BW), a subcarrier spacing (SCS), a total number of PRBs, a bandwidth (BW) scheduled by DCI, and a frequency range (FR).

[0095] The association between the granularity (or reference value) of subband precoding and the predetermined condition / parameter may be defined using a new table or an existing table. For example, the association between the granularity of subband precoding and each parameter may be defined by reusing a table or the like that associates the RBG size (or reference value) with the size of the bandwidth portion (see FIG. 10 ).

[0096] 10 shows an example of the correspondence relationship between the bandwidth size and the RBG size. A plurality of settings (cases) may be defined as the correspondence relationship between the bandwidth size and the RBG size. The base station may notify the UE of which setting to use by higher layer signaling or the like.

[0097] <<Aspect 1-2>> The granularity / reference value of frequency selective precoding (or subband precoding) may be configured / instructed to the UE based on at least one of RRC, MAC CE, and DCI. For example, candidates for granularity / reference value (e.g., candidate granularity) corresponding to predetermined conditions / parameters may be defined in advance in a specification or configured by higher layer parameters, etc., and a specific granularity / reference value to be actually applied may be instructed to the UE by MAC CE / DCI, etc.

[0098] In this way, by defining / setting the granularity at which frequency selective precoding is applied to the PUSCH, the UE can appropriately control frequency selective precoding. Furthermore, by configuring the granularity / reference value of frequency selective precoding to be changeable, it becomes possible to flexibly control frequency selective precoding according to PUSCH transmission.

[0099] [Option 1-2] The number of frequency selective precodings for UL transmission may be defined / configured. The number of frequency selective precodings (e.g., the number of frequency selective precodings) may indicate the number of frequency portions to which precoding can be separately applied in the frequency direction, or the number of frequency portions to which different precodings can be applied in the frequency direction.

[0100] The frequency portion may be referred to as a frequency part. The UE may apply precoding separately to each frequency portion.

[0101] For example, Y frequency portions may be configured for separate precoding for a bandwidth (Z BW) of Z. Application of separate precoding may be supported in the Y frequency portions.

[0102] 9B shows a case where the number of frequency selective precodings (e.g., frequency portions for which frequency selective precoding is performed) is set to 2. In this case, application of separate precoding to two frequency portions may be supported within a certain total UL bandwidth or a certain scheduled bandwidth.

[0103] Aspect 2-1: The number of frequency selective precodings (or subband precodings) may be defined with respect to a predetermined condition / parameter. The predetermined condition / parameter may be at least one of a certain bandwidth (BW), a subcarrier spacing (SCS), a total number of PRBs, a bandwidth (BW) scheduled by DCI, and a frequency range (FR).

[0104] The association between the number of frequency selective precodings and the predetermined conditions / parameters may be defined using a new table or an existing table.

[0105] <<Aspect 2-2>> The number of frequency selective precodings may be configured / instructed to the UE based on at least one of RRC, MAC CE, and DCI. For example, the number of candidates (e.g., candidate number) corresponding to a predetermined condition / parameter may be defined in advance in a specification or set by a higher layer parameter, etc., and a specific number to be actually applied may be instructed to the UE by MAC CE / DCI, etc.

[0106] Alternatively, the number of frequency selective precodings may be determined based on a predetermined parameter, which may be, for example, the bandwidth or the frequency region of the scheduled PUSCH.

[0107] By determining the number of frequency selective precodings based on notification from the base station or predetermined parameters, it becomes possible to flexibly control frequency precoding.

[0108] [Option 1-3] For frequency selective precoding of UL transmission, frequency resources may be defined / configured as separate groups (e.g., separate groups). A separate group may be configured with at least one of a predetermined number of subcarriers (or a predetermined subcarrier level), a predetermined number of RBs (or a predetermined RB level), a predetermined number of PRBs (or a predetermined PRB level), a predetermined number of RBGs (or a predetermined RBG level), and a predetermined number of subbands (or a predetermined subband level).

[0109] The group IDs of the separate groups may be indicated as frequency selective precoding groups. The group IDs may be defined in specifications for a predetermined condition / parameter at each level (e.g., X subcarriers / RB / PRB / RBG / subband level) or may be set by higher layer parameters. The predetermined condition / parameter may be at least one of a certain bandwidth (BW), a subcarrier spacing (SCS), a total number of PRBs, a bandwidth (BW) scheduled by DCI, and a frequency range (FR).

[0110] Levels indicated with the same group ID are considered as a group of a certain frequency part, and the same TPMI may be indicated (or applied). The group IDs of all levels may be configured by RRC / MAC CE / DCI.

[0111] 11 shows an example of applying frequency precoding based on a group (e.g., separate group) unit. Here, the same precoding is applied to the frequency domain corresponding to the first frequency portion (subband precoding group 00). Similarly, the same precoding is applied to the frequency domain corresponding to the second frequency portion (subband precoding group 01).

[0112] In this way, when frequency selective precoding is performed, by dividing the frequency domain into groups, it becomes possible to flexibly set the frequency portion to which each precoding is applied.

[0113] <Setting of Frequency Selective Precoding> Setting of frequency selective precoding for UL transmission of PUSCH and the like will be described.

[0114] Whether or not frequency selective precoding is applied (for example, enable / disable or activate / deactivate) may be set / instructed based on at least one of RRC, MAC CE, and DCI.

[0115] [DCI] A predetermined field of DCI may be used to dynamically indicate to a UE whether frequency selective precoding is applied. The predetermined field may be set in a predetermined DCI format (e.g., a DCI format used for PUSCH scheduling (e.g., DCI format 0_1 / 0_2)). The predetermined field may be a new field (e.g., 1 bit) or a field in an existing system (e.g., Rel. 17 or earlier) may be used.

[0116] A new field (e.g., an indication field for frequency selective precoding) may be defined / applied as an indication for each PUSCH scheduled by each DCI, thereby flexibly controlling whether or not frequency selective precoding is applied for each PUSCH transmission.

[0117] Alternatively, the new field may be defined / applied to one or more PUSCHs transmitted between the timing indicated by the new field and a new instruction (next instruction). This allows a configuration in which the new field is set in the DCI only when switching between application and non-application of frequency selective precoding to PUSCH transmission.

[0118] [RRC / MAC CE] Whether or not to apply frequency selective precoding may be semi-statically configured / instructed to a UE using RRC / MAC CE. In this case, switching of frequency selective precoding can be controlled semi-statically.

[0119] (Analysis) As mentioned above, UL subband precoding (which may also be called frequency selective precoding) is being considered in Rel. 18 and later.

[0120] The performance evaluation results of UL subband precoding for different numbers of subbands can be exemplified as follows: As the number of subbands increases (from 4 TX to 8 TX), the 50% and 95% UE throughput gains generally increase. For example, when the number of subbands is 5, the 50% UE throughput gain is 2.6% to 4.6%. When the number of subbands is 10, the 50% UE throughput gain is 4.6% to 7.4%. The performance improvement of the 50% UE throughput gain for an 8TX UE is greater than that for a 4TX UE.

[0121] The increase in required DCI overhead is related to the number of subbands scheduled per UE. For example, if the number of subbands is 5, 88% of UEs are scheduled on one subband and 98% of UEs are scheduled on a maximum of two subbands. If the number of subbands is 10, 90% of UEs are scheduled on a maximum of two subbands and 97% of UEs are scheduled on a maximum of three subbands.

[0122] As mentioned above, to support UL subband precoding, DCIs for precoding indication for each subband (TPMI field for CB, SRI field for NCB) are proposed.

[0123] However, since the precoding instruction for each subband requires a TPMI field / SRI field for the number of subbands (PRG), the DCI overhead may be large. Therefore, it is required to support UL subband precoding while reducing the DCI overhead (achieving performance improvement equivalent to that of UL subband precoding).

[0124] As described above, various regulations for realizing these goals are not yet sufficiently clear. If these regulations are not clearly defined, there is a risk that UL transmission using subband precoding cannot be appropriately controlled.

[0125] Therefore, the present inventors have focused on the existence of such cases and conceived the wireless communication method according to the present disclosure.

[0126] According to the wireless communication method of the present disclosure, it is possible to support UL subband precoding while reducing DCI overhead. This allows the UE to appropriately control UL transmission. As a result, it is possible to improve communication throughput / communication quality.

[0127] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0128] (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.

[0129] 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."

[0130] 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.

[0131] 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.

[0132] 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, etc., or a combination thereof.

[0133] 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.

[0134] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] The present disclosure is not limited to 2 TX, and may be similarly applied to 5 TX, 6 TX, 7 TX, 8 or more TX, 4 or less TX (1 to 4 TX), etc. In the following embodiments, "2" may be read as "n (n is any integer)," and in this case, those skilled in the art will be able to appropriately read the number of layers / ports, etc., described assuming that the maximum value is "2," assuming that the maximum value is "n."

[0139] It should be noted that in this disclosure, "having the capability of..." may be read interchangeably as "supporting / reporting the capability of...".

[0140] 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.

[0141] In the present disclosure, a table may be read interchangeably as one or more tables.

[0142] In the present disclosure, the terms table, mapping, correspondence, association, and association may be read interchangeably.

[0143] In the present disclosure, the RS to be measured (which may also be referred to as the measurement RS or the RS to be measured) may be a QCL source RS in an active (activated) TCI state / indicated TCI state.

[0144] 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.

[0145] In the present disclosure, UL transmission may be interchangeably read as DL reception, and in this case, PUUSCH may be interchangeably read as PDSCH.

[0146] In the present disclosure, the existing precoder and the wideband precoder may be read as interchangeable.

[0147] In this disclosure, the terms novel precoder, subband precoder, precoder cycling, and cyclic precoder may be read interchangeably.

[0148] (Wireless communication method) The embodiments of the present disclosure can be broadly categorized as follows: ・Embodiment 0: Subband precoding for UL transmission ・Embodiment 1: Precoder cycling / subband precoder ・Embodiment 2: PRB bundling ・Embodiment 3: Granularity of UL PRG ・Embodiment 4: Subband precoder (another example) Each embodiment will be described below based on these.

[0149] In the present disclosure, each embodiment / option may be applied alone or in combination with other embodiments / options.

[0150] 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.

[0151] 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.

[0152] In the present disclosure, the terms "precoding matrix" and "precoder" may be interchangeable. Furthermore, a 2TX precoder is exemplified as a precoder in the present disclosure, but this is not limiting. The present disclosure is also applicable to a precoder with any number of ports (nTX precoder) in addition to 2TX.

[0153] In the present disclosure, TPMI, TPMI field, and precoding information may be interpreted as interchangeable.

[0154] In the present disclosure, resource blocks (RBs), physical resource blocks (PRBs), resource block groups (RBGs), subbands, widebands, and precoding resource block groups (PRGs) may be interchangeable.

[0155] In the following embodiments, the precoding matrix / precoder may refer to a full / partial / non-coherent precoder.

[0156] 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) may be replaced with a number with a # (e.g., #0, #1, #2, etc.).

[0157] The UE may control UL transmission by applying the present disclosure (the various provisions described above and the following embodiments). The NW / BS / gNB may provide / transmit to the UE settings / instructions, etc. for the UE to realize the control. Furthermore, the NW / BS / gNB may perform various controls to receive the UL transmission from the UE.

[0158] The UL transmission of the present disclosure is not limited to single / multiple TRP PUSCHs, but can also be applied to multi-TRP PUSCH repetition in Rel. 17 or STxMP SFN / SDM PUSCH in Rel. 18.

[0159] According to the present disclosure, it is possible to support UL subband precoding while reducing DCI overhead. A UE can appropriately control UL transmission using subband precoding. As a result, communication throughput / communication quality can be improved.

[0160] <Tenth Embodiment> The tenth embodiment relates to subband precoding for UL transmission.

[0161] The trigger condition for subband precoding for UL transmission (e.g., PUSCH transmission) may be realized by higher layer signaling (e.g., RRC / MAC CE) / physical layer signaling (e.g., DCI).

[0162] Subband precoding for PUSCH may be triggered (configured / indicated) by higher layer signaling (e.g., RRC / MAC CE) / physical layer signaling (e.g., DCI).

[0163] The applicable trigger conditions for subband precoding include supporting at least one of the following: - Cyclic prefix OFDM (CP-OFDM) only. - Discrete Fourier transform spread OFDM (DFT-s-OFDM) only. - CP-OFDM + DFT-s-OFDM. - When the UE is not configured for dynamic waveform switching. - When the UE is configured for dynamic waveform switching. - Codebook MIMO (Multi-Input Multi-Output) only. - Non-codebook MIMO only. - Both codebook MIMO and non-codebook MIMO. - 1TX / 2TX / 4TX codebook MIMO (coherent / partially coherent / non-coherent). - 8TX codebook MIMO (codebook 1 / 2 / 3 / 4). - One or more of 1TX / 2TX / 4TX / 8TX. - PUSCH scheduled / activated by at least one (or multiple) of DCI formats 0_1 / 0_2 / 0_3. - Dynamic grant PUSCH (DG (Dynamic Grant)-PUSCH) only. - Configured grant PUSCH (CG (Configured Grant)-PUSCH) only. - Both DG-PUSCH and CG-PUSCH. - DMRS port for Rel. 15 (not configured with extended DMRS type) / DMRS port for Rel. 18 (configured with extended DMRS). - Specific rank / layer (e.g., only one layer, or two or less layers).

[0164] The subband precoding for the PUSCH transmission described above may be configured / instructed, for example, in units of precoding resource block groups (PRGs).

[0165] According to this embodiment, the method of setting / indicating subband precoding for UL transmission becomes clear.

[0166] First Embodiment The first embodiment relates to precoder cycling / subband precoders.

[0167] 12 to 14 are diagrams illustrating an example of frequency selective precoding according to embodiment 1-1. Note that, in the present disclosure (first embodiment), an example in which subband / wideband precoding is applied only to PUSCH is illustrated, but this is not limiting. Precoding may be applied not only to PUSCH but also to DMRS (i.e., both PUSCH and DMRS).

[0168] In the present disclosure, the NW may notify the phase / amplitude difference (existing precoder) between the DMRS and data (e.g., PUSCH) by an existing method, and the UE may apply the precoder commonly to all subbands according to existing specifications.

[0169] Furthermore, the UE may apply another novel precoder (which may also be called a subband precoder) (to achieve phase rotation / amplitude change) for each subband according to the UE implementation.

[0170] In this way, by adapting some operations to existing specifications (following existing operations), it is possible to reduce the impact of specifications on subband precoding.

[0171] Furthermore, since the new precoder for each subband is applied to DMRS and data (e.g., PUSCH) all at once, there is no need to notify the NW of which new precoder has been applied for each subband.

[0172] The method for determining the new precoder for each subband may depend on the UE implementation. The UE may perform channel estimation using DL-RS (SSB / CSI-RS), which allows the UE to apply an appropriate new precoder to each subband.

[0173] Furthermore, the UE may follow the UE implementation for applying a new precoder for each subband. In other words, the UE may autonomously select / determine a new precoder for each subband without following (regardless of) the precoder instruction from the NW. The NW can properly demodulate the UL transmission from the UE even if the UE does not follow the precoder instruction from the NW, as long as the same precoder is applied to both the DMRS and data.

[0174] As shown in Fig. 12, PRBs #0 to #49 may be grouped into PRGs #0 to #24, each consisting of two PRBs (the same applies to the following figures). The precoder (applied precoder) applied to each PRG #M (M may be any integer) may be, for example, W0 to W3.

[0175] Note that the NW (gNB) may perform channel estimation for each PRG. Since DMRS and data are jointly precoded, blind decoding is not required.

[0176] The NW may determine the MCS of the PUSCH based on the SRS, and may apply precoder cycling in the SRS to the MCS estimation.

[0177] Also, a random phase between the two transmissions may be introduced for every PUSCH transmission to mimic a non-coherent UE.

[0178] <<Option 1>> The precoder for a particular subband may be indicated according to existing specifications (eg, TPMI for CB, SRI for NCB).

[0179] A specific subband may be represented by PRG#M. For example, M=0 may mean the largest PRG or an intermediate PRG. The precoders of other subbands different from the specific subband may be determined according to at least one of the following options:

[0180] (Opt1-1) Determined by the UE (depending on UE implementation).

[0181] In Opt1-1, precoder cycling is applied to both DMRS and PUSCH, so the NW (gNB) does not need to know which precoder is used for each subband.

[0182] (Opt1-2) Determined by predefined rules / RRC settings.

[0183] In Opt1-2, the NW (gNB) can know which precoder is used for each subband. Precoder cycling can be applied to both DMRS and PUSCH, or only one of them (e.g., only PUSCH).

[0184] As shown in FIG. 13, in an existing precoder (wideband precoder), a common precoder W1 may be applied to the PUSCH.

[0185] <<Option 2>> The precoder for one subband / PRG / RBG#M is W1*α Ｍ where W1 may refer to one precoder as specified by existing specifications (e.g., TPMI for CB, SRI for NCB). Ｍ may follow at least one of the following options: Ｍ may be referred to as cycling or precoder cycling, i.e., the adaptive precoder (subband precoder) may be calculated by multiplying a common precoder by the cycling.

[0186] (Opt2-1) Determined by the UE (depending on the UE implementation).

[0187] In Opt2-1, precoder cycling is applied to both DMRS and PUSCH, so the NW (gNB) does not need to know which precoder is used for each subband.

[0188] (Opt2-2) Determined by predefined rules / RRC settings.

[0189] In Opt2-2, the NW (gNB) can know which precoder is used for each subband. Precoder cycling can be applied to both DMRS and PUSCH, or only one of them (e.g., only PUSCH).

[0190] As shown in FIG. 14, in the new precoder (subband precoder), cycling α Ｍ is applied. Ｍis applied to both DMRS and PUSCH. The applied precoder W1 may be an existing precoder as described above (may be determined according to existing specifications (TPMI for CB and SRI for NCB)).

[0191] In FIG. 14, the precoder W1 is applied to PRG#0, and the cycling α Ｍ may not be applied. From PRG#1 onwards, cycling α Ｍ may be applied.

[0192] <<Embodiment 1-1A>> (Modification) The order of precoder cycling may be determined by a predefined rule / RRC setting.

[0193] For example, α={0, π / 2, π, 3π / 2, 0, π / 2, π, . . .} (for subbands #0 / #1 / #2 / . . . ).

[0194] α (i.e., α Ｍ ) may be the phase shift between different ports applied to W1 for each subband.

[0195] This precoder cycling can be applied to both DMRS and PUSCH.

[0196] 15 is a diagram illustrating an example of frequency selective precoding according to embodiment 1-1A. As illustrated in FIG. 15, in a new precoder (subband precoder), cycling α Ｍ is applied. Ｍ is applied to both DMRS and PUSCH. The applied precoder W1 may be an existing precoder as described above (may be determined according to existing specifications (TPMI for CB and SRI for NCB)).

[0197] In FIG. 15, from PRG#0 onwards, cycling α Ｍ may be applied.

[0198] <<Discussion on 1A (for gNB reception)>> Since different precoder cycling (α) may be applied to each subband, the NW needs to estimate the channel using the DMRS of each subband.

[0199] When channel estimation is performed using a small subband, the accuracy of the channel estimation may be lower than when channel estimation is performed using a wideband.

[0200] More specifically, small bandwidth channel estimation may be more susceptible to inter-cell interference, at least because the smaller the sequence length of the DMRS, the greater the interference / correlation.

[0201] Therefore, when a UE applies / uses the same precoder in multiple subbands, it is effective to notify the NW of the precoder. For example, the UE may use UCI / MAC CE to notify which subbands the same / different precoders are applied / used in (e.g., by bitmap reporting).

[0202] <<Other Considerations for 1A>> When the DMRS of Extended Type 1 of Rel. 18 is applied to the PUSCH, a frequency domain orthogonal cover code (FD-OCC) can be applied across two PRBs.

[0203] To maintain the orthogonality of the FD-OCC, the same starting position of the FD-OCC should be applied to all UEs, and the FD-OCC should be applied within a PRG.

[0204] Therefore, when the DMRS of Extension Type 1 of Rel. 18 is applied to the PUSCH, at least one of the following optional restrictions may be specified:

[0205] (OptA) The UE may assume that the number of consecutively scheduled PRBs for PUSCH is even and that the offset (from common resource block 0 of each set) of consecutively scheduled PRBs for PUSCH is even.

[0206] (OptB) A UE may not expect different precoding (precoders) for potentially co-scheduled UEs of other DM-RS ports in the same CDM group in the PRG level grid configured for that UE with PRG=2 or 4.

[0207] (Note) In both OptA and OptB, the NW (gNB) can schedule PUSCH. Also, even if no particular restriction is set, it may be restricted by the NW implementation.

[0208] <<Embodiment 1-1B>> Fig. 16 is a diagram illustrating an example of a correspondence relationship between an applicable precoder and a 2TX precoder according to the present disclosure. Fig. 17 is a diagram illustrating an example of frequency selective precoding according to embodiment 1-1B.

[0209] The order of precoder cycling may be determined by predefined rules / RRC configuration.

[0210] The precoders applied to the PUSCH may be set / instructed in the order of W0, W1, W2, W3, W0, ... for PRG #0 / #1 / #2 / #3 / ...

[0211] This precoder cycling may only be applied to the PUSCH.

[0212] Some existing precoders (e.g., the [antenna selection] precoder including a value of 0 in the precoder for 2TX in FIG. 5A ) may be omitted for precoder cycling. That is, the correspondence between the precoder for 2TX and the applied precoder Wx may follow the correspondence shown in FIG. 16. The correspondence shown in FIG. 16 is also applicable to other embodiments.

[0213] In FIG. 17, precoder Wx (W0 to W3) may be repeatedly applied to PRGs #0 to #24 in this order as a new precoder. For example, precoders W0 to W3 may be applied to PRGs #0 to #3. From PRG #4 onwards, precoders W0 to W3 may be repeatedly (cyclically) applied in ascending order of index. Precoders W0 to W3 may be referred to as precoder cycling.

[0214] In embodiment 1-1B, the network can utilize the wide bandwidth of the DMRS of the PUSCH for channel estimation.

[0215] According to this embodiment, a new precoder to which precoder cycling is applied can be indicated for each subband, and the UE can appropriately control UL transmission by applying the new precoder.

[0216] Second Embodiment The second embodiment relates to bundling of PRBs.

[0217] <<Embodiment 2-1>> At least one of the following optional parameters may be added (included) in the parameters (PUSCH-Config) related to the PUSCH configuration.

[0218] (Opt2-1-1) Only parameters related to semi-static bundling (staticBundling) may be specified / supported, which may simplify the impact on the specification and UE implementation.

[0219] (Opt2-1-2) Only parameters related to dynamic bundling (dynamicBundling) may be specified / supported. In this case, the NW can control more flexible scheduling.

[0220] (2-1-3) Both parameters related to semi-static bundling (staticBundling) and parameters related to dynamic bundling (dynamicBundling) may be defined / supported.

[0221] (Note) The above dynamicBundling and staticBundling may refer to a parameter (prb-BundlingType) indicating the type of PRB bundling.

[0222] For each of the above parameters (prb-BundlingType, staticBundling, dynamicBundling), the same (common) / different parameters may be set in any of DCI formats 0_1 / 0_2 / 0_3.

[0223] <<Embodiment 2-2>> A parameter (PUSCH-Config) related to a PUSCH configuration may include a parameter (bundleSize) related to a bundle size (the number of PRBs for a PRG / RBG). The bundleSize may represent the size of a subband.

[0224] In bundleSize, {2, 4, X, wideband} PRBs may be supported, where the value of X may be one or more values ​​(e.g., X=6, 8, etc.) and may be predefined by the specification.

[0225] If bundlesize (subband size) is not configured in the PUSCH-Config or if bundlesize="wideband" is configured, the existing behavior may apply, e.g., the wideband precoder is applied to the PUSCH and subband precoding is not applied to the PUSCH.

[0226] <<Embodiment 2-3>> When only parameters related to dynamic bundling (dynamicBundling) are defined / supported, the DCI fields shown below may be added in at least one of DCI formats 0_1 / 0_2 / 0_3.

[0227] PRB bundling size indicator. This field may indicate the PRB bundling size. For example, if the higher layer parameter (prb-BundlingType) related to the PRB bundling type is not set or the PRB bundling type is set to staticBundling, this field is 0-bit. If the higher layer parameter (prb-BundlingType) related to the PRB bundling type is set to dynamicBundling according to a predetermined rule (see the specification examples of embodiments 2 to 4 described later), this field is 1-bit.

[0228] For each of the above parameters (prb-BundlingType, staticBundling, dynamicBundling), the same (common) / different parameters may be set in any of DCI formats 0_1 / 0_2 / 0_3.

[0229] The above-mentioned predetermined rules may be defined by specifications (see the specification description examples in the second to fourth embodiments described later).

[0230] <<Embodiment 2-4>> An example of the specification description for PRB bundling is shown below. (Specification Description Example) Physical resource block (PRB) bundling. By applying prb-BundlingTypeDCI-0-2 instead of prb-BundlingType and vrb-ToPRB-InterleaverDCI-0-2 instead of vrb-ToPRB-Interleaver as parameters in PUSCH-Config, the PRB bundling procedure for PUSCH scheduled by a PDCCH of DCI format 0_1 ​​described in this section is equally applicable to PUSCH scheduled by a PDCCH of DCI format 0_2. The PRB bundling procedure for PUSCH scheduled by a PDCCH of DCI format 0_1 ​​described in this section is equally applicable to PUSCH scheduled by a PDCCH of DCI format 0_3.

[0231] When receiving a PUSCH scheduled by a PDCCH of (with) DCI format 0_1 ​​having a CRC scrambled by a specific RNTI (e.g., C-RNTI, MCS-C-RNTI, or CS-RNTI), if the upper layer parameter prb-BundlingType is set to dynamicBundling, the upper layer parameters bundleSizeSet1 and bundleSizeSet2 are set to P' ＢＷＰｉ Two sets of values ​​are set: the first set is one or two P's in {2, 4, wideband} ＢＷＰｉ The second set can take on two P' values ​​in {2, 4, wideband}.ＢＷＰｉ Can take on values.

[0232] When receiving a PUSCH scheduled by a PDCCH of (with) DCI format 0_1 ​​having a CRC scrambled by a specific RNTI (e.g., C-RNTI, MCS-C-RNTI, or CS-RNTI), if the upper layer parameter prb-BundlingType is set to dynamicBundling, P' ＢＷＰｉ The value may be set to a single value indicated by the upper layer parameter bundleSize for bundle size.

[0233] (Note) In the above example, the part "by applying prb-BundlingTypeDCI-0-2 instead of prb-BundlingType and vrb-ToPRB-InterleaverDCI-0-2 instead of vrb-ToPRB-Interleaver as parameters in PUSCH-Config" may depend on whether the same (common) / different parameters are set / specified for DCI formats 0_1 / 0_2 / 0_3.

[0234] The size of the PRG may be updated from {2, 4, wideband} according to the options in embodiment 2-1 above.

[0235] According to this embodiment, the provisions regarding PRB bundling are clarified.

[0236] Third Embodiment The third embodiment relates to the granularity of UL PRG for MIMO in Rel. 19 and later.

[0237] The granularity (or level) of frequency selective precoding for UL transmission may be defined / configured. The granularity of precoding (which may be referred to as precoder granularity) may be at least one of a predetermined subcarrier unit, a predetermined resource block (RB) unit, a predetermined physical resource block (PRB) unit, a predetermined resource block group (RBG) unit, a predetermined subband unit, and a precoding resource block group (PRG) unit.

[0238] The granularity of precoding (PRG) may be applicable only to CP-OFDM waveforms.

[0239] The size of the PRG is configurable by higher layer signaling (RRC). The supported PRG size may be {2, 4, x, wideband} PRB.

[0240] The size of the PRG configured as wideband for the PUSCH may be the same as that of the existing PUSCH.

[0241] The PRB bundling indication field in the DL DCI may be utilized.

[0242] The granularity of precoding may be applied when the higher layer parameters (txConfig) related to transmission configuration in pusch-Config are set to a codebook.

[0243] The granularity of precoding may be targeted at UEs capable of supporting non-coherent and non-ULFullPowerMode.

[0244] The SRS, DMRS, and PTRS may not be extended, for example, the actual number of PTRS ports may be the same across all PRGs.

[0245] According to this embodiment, the granularity of the UL PRG is defined.

[0246] Fourth Embodiment The fourth embodiment relates to precoder cycling / subband precoder (another example).

[0247] 18 and 19 are diagrams illustrating an example of frequency selective precoding according to the fourth embodiment.

[0248] As shown in FIG. 18, in an existing precoder (wideband precoder), a common precoder W1 may be applied to both PUSCH and DMRS.

[0249] When a subband precoder is instructed to the UE, the UE may apply a different precoder to each subband. The precoder for each subband may be determined autonomously by the UE (without following a precoder instruction from the NW).

[0250] As shown in FIG. 19 , precoder Wx (W0 to W3) may be repeatedly applied to PRGs #0 to #24 as a new precoder (subband precoder) in this order. For example, precoders W0 to W3 may be applied to PRGs #0 to #3. From PRG #4 onwards, precoders W0 to W3 may be repeatedly (cyclically) applied in ascending order of index. Precoders W0 to W3 may be referred to as precoder cycling.

[0251] This precoder cycling may be applied to both PUSCH and DMRS.

[0252] <<Method of Determining Each Subband Precoder>> At least one of the following options can be applied.

[0253] (Opt4-1) The UE freely (autonomously) decides for each subband. For example, the UE may select an appropriate precoder based on the reception result of SSB / CSI-RS. By allowing the UE to freely select a precoder, more flexible (effective) UL transmission can be realized.

[0254] (Opt4-2) Apply precoder cycling to each subband based on a predetermined rule. For example, apply precoder cycling to a specific subband according to instructions from the network, and apply precoder cycling to other subbands (other than the specific subband).

[0255] More specifically, the precoders for the minimum / maximum / Nth subbands are determined according to instructions from the network. For the precoders for the other subbands, the precoder index is shifted in order according to the subband number / index (e.g., index 0 to 3).

[0256] If the subband precoder is based on a predetermined rule, the precoder can be a random precoder for each subband.

[0257] <<Candidates for Each Subband Precoder>> Candidates for each subband precoder may be predefined by a specification. The candidates may be specified for each coherence type. The UE may select / indicate / determine a precoder to be applied from these candidates.

[0258] For example, the UE may select from a set number of transmissions (TX number) and a coherent type precoder. That is, the UE may select from precoder candidates that should originally be indicated by DCI. By determining a predetermined precoder candidate, it is possible to reduce specific variations and enable stable UL transmission control / operation.

[0259] Alternatively, the precoder to be applied may be determined depending on the UE implementation. For example, it may be determined in the same way as in non-coherent MIMO. When the precoder is determined by the UE implementation, it is possible to improve peak characteristics in particular.

[0260] <<Note>> In the case of the above-mentioned Opt4-1, since the UE ignores the precoder instruction from the NW (the UE does not follow the instruction), when a subband precoder is instructed, it is possible to reduce the fields related to the precoder instruction (e.g., TPMI for CB, SRI for NCB) of the UL DCI (e.g., DCI format 1_0 / 1_1 / 1_2 / 1_3, etc.).

[0261] <<Instruction of Rank / Number of Layers>> The rank / number of layers of the PUSCH may be determined according to an instruction from the NW, or may be determined autonomously by the UE (depending on the UE implementation).

[0262] FIG. 20 is a diagram illustrating an example of a correspondence relationship between DCI and the rank / number of layers of a PUSCH according to the fourth embodiment.

[0263] 20 shows the setting value of the maximum rank / number of layers of the PUSCH. When a subband precoder is configured, the rank / number of layers of the PUSCH may be indicated by a DCI field in accordance with the correspondence relationship in FIG.

[0264] FIG. 20 shows an example in which the TPMI / SRI field is reduced and only the rank / number of layers of the PUSCH is indicated. The size of the DCI field may be determined according to the setting value of the maximum rank / number of layers of the PUSCH. In this case, the TPMI / SRI field may be indicated by a separate field (an existing field or a new field). The new field may be present when a subband precoder is configured. If the TPMI / SRI field does not exist, the number of bits may be reduced.

[0265] As shown in Figure 20, if the maximum rank number is 1, the only PUSCH rank is {1}, so the DCI field size can be 0 bits. If the maximum rank number is 2, the only PUSCH rank is {1, 2}, so the DCI field size can be 1 bit. If the maximum rank number is 3, the only PUSCH rank is {1, 2, 3}, so the DCI field size can be 2 bits. If the maximum rank number is 4, the only PUSCH rank is {1, 2, 3, 4}, so the DCI field size can be 2 bits. If the maximum rank number is 5 to 8, the DCI field size can be 3 bits.

[0266] The rank / layer number indication may be applied to the entire PUSCH band or may be applied only to a portion of the PUSCH band. Alternatively, multiple PUSCH rank / layer number indication fields may be present in the schedule DCI, and the same / different PUSCH rank / layer may be indicated for each subband.

[0267] <<Modification>> When a UE freely determines a precoder for each subband, there may be cases where it is difficult to control the precoder on the NW side. Therefore, the NW may instruct a set of precoder candidates that the UE can select.

[0268] For example, in the existing specifications, DCI indicates which of {W1, W2, W3, W4} to use, but the network may use DCI / MAC CE to narrow down the number of candidates to a predetermined number and indicate the number.

[0269] More specifically, the NW may use DCI / MAC CE to instruct the use of one of {W2, W3}, and the UE may arbitrarily select from the candidates and apply it as a precoder for each subband.

[0270] According to this embodiment, the method of setting / indicating subband precoding for UL transmission becomes clear.

[0271] <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.

[0272] 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.

[0273] 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.

[0274] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0275] <<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.

[0276] 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.

[0277] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0278] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0279] <<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.

[0280] The specific UE capabilities may indicate at least one of the following: Supporting specific processing / operation / control / information for at least one of the above embodiments, Supporting 1, 2, 4, 8 TX UL transmission, Supporting multiple different antenna layouts / number of antenna groups, Supported coherence groups, Supported coherence types (fully coherent / partially coherent / non-coherent), Supported number of precoder candidates, Supporting wideband precoder / precoder cycling / subband precoder.

[0281] 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).

[0282] 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)).

[0283] If the above conditions are not met, the UE / BS may follow the behavior specified in existing 3GPP releases.

[0284] (Supplementary Notes) The following inventions are supplementary notes regarding one embodiment (first embodiment) of the present disclosure. [Supplementary Note 1] A terminal having: a receiver that receives precoding information indicating a precoder for uplink (UL) transmission; and a controller that determines a subband precoder to be applied for each subband based on the precoding information. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the subband corresponds to a precoding resource block group (PRG) that groups a plurality of physical resource blocks (PRBs). [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the controller determines the subband precoder by applying cycling related to a phase shift for each subband to a commonly set precoder. [Supplementary Note 4] The terminal according to any one of Supplementary Notes 1 to 3, wherein the controller determines the subband precoder by applying precoder cycling for each subband.

[0285] (Supplementary Notes) The following inventions are supplementary notes regarding an embodiment (0th to 4th embodiments) of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiver that receives precoding information indicating a precoder for uplink (UL) transmission; and a controller that determines a subband precoder to be applied to each subband based on the precoding information, wherein the controller determines whether to trigger subband precoding in accordance with a specific condition. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the subband corresponds to a precoding resource block group formed by grouping a plurality of physical resource blocks (PRBs), and the controller determines the size of the PRG based on a setting related to bundling of the PRBs. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the subband corresponds to a precoding resource block group formed by grouping a plurality of physical resource blocks (PRBs), and the controller determines the size of the PRG based on a setting related to a granularity of the PRG. [Supplementary Note 4] The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein the control unit determines the subband precoder regardless of a precoder instruction from a base station.

[0286] (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.

[0287] 21 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).

[0288] 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.

[0289] 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.

[0290] 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))).

[0291] 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.

[0292] 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).

[0293] 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.

[0294] 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.

[0295] 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.

[0296] 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.

[0297] 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.

[0298] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0299] 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).

[0300] 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.

[0301] 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.

[0302] 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.

[0303] 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).

[0304] 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.

[0305] 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.

[0306] 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.

[0307] 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.

[0308] 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.

[0309] 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.

[0310] 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.

[0311] 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.

[0312] 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).

[0313] 22 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.

[0314] 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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 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.

[0319] 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.

[0320] 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.

[0321] 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.

[0322] 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.

[0323] 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.

[0324] 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.

[0325] 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.

[0326] 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.

[0327] 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.

[0328] 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.

[0329] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0330] The transceiver 120 may transmit precoding information indicating a precoder for uplink (UL) transmission. The controller 110 may control reception of UL transmission based on a subband precoder to be applied to each subband determined by the terminal based on the precoding information.

[0331] The control unit 110 may determine whether to trigger subband precoding according to a specific condition.

[0332] (User terminal) Fig. 23 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.

[0333] 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.

[0334] 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.

[0335] 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.

[0336] 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.

[0337] 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.

[0338] 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.

[0339] 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.

[0340] 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.

[0341] 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.

[0342] 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.

[0343] 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.

[0344] 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.

[0345] 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.

[0346] 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.

[0347] 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.

[0348] 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.

[0349] 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.

[0350] The transceiver unit 220 may perform at least one of the processes of the transmitter / receiver unit in any of the above appendices.

[0351] The control unit 210 may execute at least one of the processes of any of the control units described above.

[0352] The subband may correspond to a precoding resource block group (PRG) that groups multiple physical resource blocks (PRBs).

[0353] (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.

[0354] 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.

[0355] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 24 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0356] 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.

[0357] 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.

[0358] 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.

[0359] 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.

[0360] 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.

[0361] 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.

[0362] 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.

[0363] 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.

[0364] 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).

[0365] 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.

[0366] 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.

[0367] (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.

[0368] 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.

[0369] 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.

[0370] 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.

[0371] 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.

[0372] 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.

[0373] 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.

[0374] 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.

[0375] 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.

[0376] 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.

[0377] 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.

[0378] 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.

[0379] 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.

[0380] 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.

[0381] 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.

[0382] 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.

[0383] 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.

[0384] 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.

[0385] 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."

[0386] 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.

[0387] 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.

[0388] 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.

[0389] 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.

[0390] 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.

[0391] 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.

[0392] 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.

[0393] 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).

[0394] 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).

[0395] 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).

[0396] 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.

[0397] 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.

[0398] 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).

[0399] 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.

[0400] 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.

[0401] 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.

[0402] 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.

[0403] 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.

[0404] 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.

[0405] 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.

[0406] 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.

[0407] 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.

[0408] 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.

[0409] 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.

[0410] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0411] 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.

[0412] 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.

[0413] 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.

[0414] 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.

[0415] 25 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.

[0416] 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.

[0417] 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).

[0418] 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.

[0419] 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.

[0420] 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.

[0421] 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.

[0422] 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.

[0423] 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).

[0424] 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.

[0425] 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)).

[0426] 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.

[0427] 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.

[0428] 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.

[0429] 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.

[0430] 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.

[0431] 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).

[0432] 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."

[0433] 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.

[0434] 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.

[0435] 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.

[0436] 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.

[0437] 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...."

[0438] 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).

[0439] 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.

[0440] 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."

[0441] 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.

[0442] 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."

[0443] 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.

[0444] 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.

[0445] 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 an arbitrary integer) attached (for example, "highest" may be interchangeable with "i-th highest").

[0446] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0447] 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.

[0448] 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.

[0449] 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 precoding information indicating a precoder for uplink (UL) transmission; and a control unit that determines a subband precoder to be applied for each subband based on the precoding information.

2. The terminal according to claim 1, wherein the subband corresponds to a precoding resource block group (PRG) that groups a plurality of physical resource blocks (PRBs).

3. The terminal according to claim 1, wherein the control unit determines the subband precoder by applying cycling of a phase shift for each subband to a commonly set precoder.

4. The terminal according to claim 1, wherein the control unit determines the subband precoder by applying precoder cycling for each subband.

5. A wireless communication method for a terminal, comprising: receiving precoding information indicating a precoder for uplink (UL) transmission; and determining a subband precoder to be applied for each subband based on the precoding information.

6. A base station having: a transmitting unit that transmits precoding information indicating a precoder for uplink (UL) transmission; and a control unit that controls reception of UL transmission based on a subband precoder to be applied for each subband determined by a terminal based on the precoding information.

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