Terminal, wireless communication method, base station and system

Abstract

A terminal according to one aspect of the present disclosure is characterized by comprising a control unit that determines an 8-port precoder on the basis of a 4 or less-port precoder, and a transmission unit that performs uplink transmission on the basis of the 8-port precoder, wherein the control unit determines a scaling factor to be applied to the 8-port precoder on the basis of a certain condition. This embodiment of the present disclosure makes it possible to suitably control UL transmission using more than four antenna ports.

Description

Terminal, wireless communication method and base station

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

[0002] Long Term Evolution (LTE) has been specified for the Universal Mobile Telecommunications System (UMTS) network with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) has been specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) are also being considered.

[0004] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

[0005] Rel. 15 NR supports uplink (UL) multi-input multi-output (MIMO) transmission with up to four layers. For future NRs, support for UL transmission with a number of layers greater than four is being considered to achieve higher spectral efficiency. For example, for Rel. 18 NR, maximum 6-rank transmission using 6 antenna ports and maximum 6- or 8-rank transmission using 8 antenna ports are being considered.

[0006] However, there has been little progress in studying how to determine a precoding matrix for UL transmission using more than four antenna ports. For example, there has been little progress in studying a precoder for layer 1-8 transmission using eight antenna ports. Unless this is clarified, there is a risk that an increase in communication throughput will be inhibited.

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

[0008] A terminal according to one aspect of the present disclosure has a control unit that determines an 8-port precoder based on a 4-port or less precoder, and a transmission unit that performs uplink transmission based on the 8-port precoder, and is characterized in that the control unit determines a scaling factor to be applied to the 8-port precoder based on certain conditions.

[0009] According to one aspect of the present disclosure, UL transmission using more than four antenna ports can be appropriately controlled.

[0010] Figure 1 is a diagram showing an example of a table of precoding matrices W for single-layer (rank-1) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 2 is a diagram showing an example of a table of precoding matrices W for two-layer (rank-2) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 3 is a diagram showing an example of a table of precoding matrices W for three-layer (rank-3) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 4 is a diagram showing an example of a table of precoding matrices W for four-layer (rank-4) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 5A is a diagram showing an example of a table of precoding matrices W for single-layer (rank-1) transmission using two antenna ports in Rel. 16 NR. Figure 5B is a diagram showing an example of a table of precoding matrices W for two-layer (rank-1) transmission using two antenna ports in Rel. 16 NR. Figure 6 shows an example of a table of precoding matrices W for two-layer (rank-2) transmission using two antenna ports when transform precoding is disabled in Rel. 16 NR. Figure 6 shows an example of the correspondence between the field values ​​of precoding information and number of layers and the number of layers and TPMI in Rel. 16 NR. Figures 7A-7C show an SRI indication or a second SRI indication when transmitting a codebook-based PUSCH in Rel. 17. Figure 8 shows an example of an antenna layout for eight antenna ports. Figure 9A shows an example of a new three-layer precoder by reusing an existing four-port partially coherent precoder. Figure 9B shows an example of a six-layer precoder with four layers from one coherent group and two layers from another coherent group. Figure 10A shows an example of a four-layer precoder with two layers from one coherent group and two layers from another coherent group. 10B is a diagram illustrating an example of an 8-layer precoder using four 2-layer precoders from four coherent groups. FIG. 11A and FIG. 11B are diagrams illustrating an example of an 8-port UL precoder.12A and 12B are diagrams illustrating another example of an 8-port UL precoder. FIGS. 13A and 13B are diagrams illustrating an example of a precoder that takes phase adjustment into consideration. FIG. 14A is a diagram illustrating an example of a 4-layer precoder. FIG. 14B is a diagram illustrating an example of a 1-layer precoder. FIGS. 15A and 15B are diagrams illustrating an example of an 8-port UL precoder corresponding to FIGS. 13 and 14 . FIGS. 16A to 16C are diagrams illustrating an example of a precoder to which a scaling factor according to the first embodiment is applied. FIGS. 17A and 17B are diagrams illustrating another example of a precoder to which a scaling factor according to the first embodiment is applied. FIGS. 18A and 18B are diagrams illustrating another example of a precoder to which a scaling factor according to the first embodiment is applied. FIGS. 19A and 19B are diagrams illustrating another example of a precoder to which a scaling factor according to the first embodiment is applied. FIGS. 20A and 20B are diagrams illustrating another example of a precoder to which a scaling factor according to the first embodiment is applied. 21A and 21B are diagrams illustrating an example of a precoder to which a scaling factor according to the second embodiment is applied. FIGS. 22A and 22B are diagrams illustrating another example of a precoder to which a scaling factor according to the second embodiment is applied. FIGS. 23A and 23B are diagrams illustrating another example of a precoder to which a scaling factor according to the second embodiment is applied. FIGS. 24A to 24C are diagrams illustrating another example of a precoder to which a scaling factor according to the second embodiment is applied. FIG. 25 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 26 is a diagram illustrating an example of a configuration of a base station according to an embodiment. FIG. 27 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. FIG. 28 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to an embodiment. FIG. 29 is a diagram illustrating an example of a vehicle according to an embodiment.

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

[0012] Specifically, the UE may receive at least one of information regarding one or more SRS resource sets (SRS resource set information, e.g., the RRC control element "SRS-ResourceSet") and information regarding one or more SRS resources (SRS resource information, e.g., the RRC control element "SRS-Resource").

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

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

[0015] Here, the SRS resource type may indicate any one of periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic CSI (Aperiodic SRS (A-SRS)). Note that the UE may transmit P-SRS and SP-SRS periodically (or periodically after activation), and transmit A-SRS based on an SRS request in the DCI.

[0016] Furthermore, the use ("usage" of the RRC parameter, "SRS-SetUse" of the L1 (Layer-1) parameter) may be, for example, beam management, codebook (CB), non-codebook (NCB), antenna switching, etc. The SRS for codebook or non-codebook use may be used to determine a precoder for codebook-based or non-codebook-based uplink shared channel (Physical Uplink Shared Channel (PUSCH)) transmission based on the SRI.

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

[0018] The SRS resource information may include an SRS resource ID (SRS-ResourceId), the number of SRS ports, the SRS port number, a transmission comb, an SRS resource mapping (e.g., time and / or frequency resource position, resource offset, resource period, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), hopping-related information, an SRS resource type, a sequence ID, spatial relationship information of the SRS, etc.

[0019] The spatial relationship information of the SRS (e.g., the RRC information element "spatialRelationInfo") may indicate spatial relationship information between a predetermined reference signal and the SRS. The predetermined reference signal may be at least one of a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, a Channel State Information Reference Signal (CSI-RS), and an SRS (e.g., another SRS). The SS / PBCH block may be referred to as a Synchronization Signal Block (SSB).

[0020] The spatial relationship information of the SRS may include at least one of an SSB index, a CSI-RS resource ID, and an SRS resource ID as an index of the predetermined reference signal.

[0021] In the present disclosure, the SSB index, SSB resource ID, and SSB Resource Indicator (SSBRI) may be interchangeable. Furthermore, the CSI-RS index, CSI-RS resource ID, and CSI-RS Resource Indicator (CRI) may be interchangeable. Furthermore, the SRS index, SRS resource ID, and SRI may be interchangeable.

[0022] The spatial relationship information of the SRS may include a serving cell index, a BWP index (BWP ID), etc. corresponding to the predetermined reference signal.

[0023] When the UE is configured with spatial relationship information regarding the SRS and an SSB or CSI-RS for a certain SRS resource, the UE may transmit the SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter for receiving the SSB or CSI-RS (spatial domain receive filter). In this case, the UE may assume that the UE receive beam for the SSB or CSI-RS and the UE transmit beam for the SRS are the same.

[0024] When the UE is configured with spatial relationship information between another SRS (reference SRS) and the target SRS for a certain SRS (target SRS), the UE may transmit the target SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter (spatial domain transmit filter) for transmitting the reference SRS. That is, in this case, the UE may assume that the UE transmit beam of the reference SRS and the UE transmit beam of the target SRS are the same.

[0025] The UE may determine the spatial relationship of the PUSCH scheduled by the DCI (e.g., DCI format 0_1) based on the value of a predetermined field (e.g., an SRS resource identifier (SRI) field) in the DCI. Specifically, the UE may use spatial relationship information of the SRS resources (e.g., the RRC information element "spatialRelationInfo") determined based on the value of the predetermined field (e.g., the SRI) for PUSCH transmission.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0044] Figures 1-5 are diagrams showing examples of associations 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 W in ascending order of TPMI indices from left to right (similarly shown in Figures 2-5).

[0045] The correspondence (which may be called a table) showing the TPMI index and the corresponding W as shown in Figures 1-5 is also called a codebook. A part of this codebook is also called a codebook subset.

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

[0047] 2-4 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 complete, partial, and non-coherent) or between 0 and 1 (codebook subset is non-coherent). According to Figure 5B, the TPMI signaled to the UE for two-port two-layer transmission is between 0 and 2 (codebook subsets are complete, partial, and non-coherent) or 0 (codebook subset is non-coherent).

[0053] 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.

[0054] The non-coherent codebook and the partially coherent codebook may be called an antenna selection precoder, an antenna port selection precoder, etc. For example, the non-coherent codebook (non-coherent precoder) may be called a 1-port selection precoder, a 1-port port selection precoder, etc. Furthermore, the partially coherent codebook (partially coherent precoder) may be called 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 called a non-antenna selection precoder, an all-port precoder, etc.

[0055] 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).

[0056] 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).

[0057] Hereinafter, in this disclosure, for simplicity, the noncoherent precoder, the partially coherent precoder, and the fully coherent precoder will also be simply referred to as an NC (noncoherent) precoder, a PC (partial coherent) precoder, and an FC (full coherent) precoder, respectively.

[0058] Furthermore, hereinafter, in this disclosure, for simplicity, an NC / PC / FC precoder for i-layer (i is an integer; i = 1 for a single layer) transmission of n antenna ports (n is an integer) will also be simply referred to as an n-port i-layer NC / PC / FC precoder.

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

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

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

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

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

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

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

[0066] <SRS configuration for codebook-based PUSCH> Fig. 7A shows the SRS configuration for codebook-based PUSCH 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 shows the SRI indication or the second SRI indication for codebook-based PUSCH transmission when ul-FullPowerTransmission = fullpowerMode2 and N SRS 10 shows an SRI indication or a second SRI indication for codebook-based PUSCH transmission when .SIGMA.=4.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0085] In previous specifications, as shown in Figure 6, one value for the number of layers (up to four layers) and one TPMI index could be specified to a UE using one precoding information field. For transmission via more than four antenna ports, it is being considered to specify one value for the number of layers (up to eight layers) and one TPMI index to a UE using one precoding information field using a table different from that shown in Figure 6. In this case, if a table with a rank greater than four is defined for the table of precoding matrix W as shown in Figure 1, eight-port transmission can be realized based on the number of layers and TPMI index to be notified.

[0086] It is also being considered to include multiple precoding information fields (which may be referred to as extended TPMI fields, etc.) in the DCI to specify multiple combinations of one layer number (up to four layers) and one TPMI index to the UE. Each precoding information field may be associated with a coherent group.

[0087] In this case, the UE may reuse the existing 2- or 4-port UL precoder of Rel. 15 / 16 to configure a new 8-port UL precoder. Examples are shown below using figures. Note that in these figures, the existing precoder W ４ＴＸ , W ２ＴＸ , W ０ The notation using W is also shown. ４ＴＸ is an existing 4-port UL precoder, ２ＴＸ is an existing two-port UL precoder, ０ means a matrix whose elements (components) are all 0.

[0088] For a UE with two coherent groups, one or more existing precoders W ４ＴＸ / W ２ＴＸ A new 8-port precoder may be formed by reusing the TPMI indexes 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61

[0089] 9A is a diagram illustrating an example of a new three-layer precoder that reuses an existing four-port partially coherent precoder. In FIG. 9A, for example, the existing three-layer precoder shown in FIG. 3 is reused.

[0090] 9B shows an example of a 6-layer precoder with 4 layers from one coherent group and 2 layers from another coherent group, reusing existing 2-layer and 4-layer precoders, e.g., as shown in FIGS.

[0091] For a UE with four coherent groups, 1, 2, 3, or 4 existing precoders W ２ＴＸ A new 8-port precoder may be formed by reusing the TPMI indexes 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 66, 67, 68, 70, 71, 72

[0092] Figure 10A shows an example of a four-layer precoder with two layers from one coherent group and two layers from another coherent group, reusing the existing two-layer precoder shown in Figure 5B, for example.

[0093] 10B is a diagram illustrating an example of an 8-layer precoder using four 2-layer precoders from four coherent groups, where the existing 2-layer precoder shown in FIG. 5B is reused.

[0094] In the above-mentioned 8-port UL precoder, when constructing a new 8TX precoder using two 4TX precoders, the UE simply reuses the existing 4TX precoder without considering co-phasing between the two coherent groups. However, the UE may determine an 8TX precoder (a precoder corresponding to 8 antenna ports) based on the two 4TX precoders by performing phase adjustment (e.g., 4 values ​​{1, −1, j, −j}) between the two coherent groups (4TX precoders).

[0095] An 8TX precoder may be determined (formed) by reusing a 4TX fully coherent precoder, as shown in Figures 11 and 12. Figures 11 and 12 are diagrams illustrating an example of an 8TX precoder.

[0096] As shown in FIGS. 11A and 11B, the UE uses one 4TX fully coherent precoder (W ４ＴＸ，１ ) may be reused to form a new 8TX fully coherent precoder, where co-phasing may or may not be considered (FIG. 11A) or may be considered (FIG. 11B).

[0097] As shown in Figures 12A and 12B, the UE uses multiple 4TX fully coherent precoders (W ４ＴＸ，１～４ ) may be reused to determine (form) a new 8TX fully coherent precoder, where co-phasing may or may not be considered (FIG. 12A) or may be considered (FIG. 12B).

[0098] Here, φ in FIGS. 11B and 12B is a coefficient indicating co-phasing (which may be called a co-phasing coefficient), and for example, φ=e jπ / 2 Also, the new scaling factor (power factor) of the 8TX precoder may or may not be considered.

[0099] As described above, when reusing existing precoders to form a new 8-port UL precoder, it is possible to consider phase adjustment between the selected precoders (panels).

[0100] 13A and 13B are diagrams illustrating an example of a precoder that takes phase adjustment into consideration. In FIG. 13, two existing precoders (P １ , P ２ This shows the case where P １ , P ２ may correspond to a first codeword and a second codeword selected from a 4TX codebook, e.g., P １ =W ４ＴＸ，ｒ＝４ , P ２ =W ４ＴＸ，ｒ＝３ , In Fig. 13, the power allocation is equal among the selected precoders, i.e., the power factor of the precoders is taken into consideration.

[0101] However, P １ , P ２ It remains to be explored whether the original power factor should be taken into account or how to determine the final scaling factor of the new 8-port UL precoder.

[0102] FIG. 14A is a diagram illustrating an example of a four-layer precoder. FIG. 14B is a diagram illustrating an example of a one-layer precoder. １ , and FIG. 14B corresponds to P ２As shown in Fig. 14, when a new precoder (5-layer fully coherent precoder) is formed by reusing an existing 4-layer precoder (P1) and an existing 1-layer precoder (P2), an 8TX precoder as shown in Fig. 15 is formed.

[0103] 15A and 15B are diagrams illustrating an example of an 8-port UL precoder corresponding to FIGS. 13 and 14. As shown in FIG. 15A, an existing precoder (P １ , P ２ If the scaling factor of (i.e., ∑ i = 1 , ∑ j ...

[0104] On the other hand, as shown in FIG. 15B, the existing precoder (P １ , P ２ ) is not reused (maintained), the total power of all ports (8 ports) exceeds 1. Thus, the scaling factors of the new 8-port UL precoders in both Figs. 15A and 15B are not appropriate values.

[0105] Therefore, the present inventors have devised a method for appropriately determining the scaling factor (power factor) for the new precoder.

[0106] 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.

[0107] 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."

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0113] 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.

[0114] 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.

[0115] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information" may be interchangeable with "set of spatial relationship information," "one or more pieces of spatial relationship information," etc. The TCI state and the TCI may be interchangeable with each other.

[0116] In the following embodiments, "plurality" and "two" may be read interchangeably.

[0117] The number of layers for PUSCH transmission in the following embodiments may be greater than 4 or less than 4. For example, PUSCH transmission of two CWs in the present disclosure may be performed with a number of layers less than 4 (for example, 2). In addition, the maximum number of layers is not limited to 4 or more, and may be less than 4.

[0118] Furthermore, PUSCH transmission in the following embodiments may or may not be based on the premise that multiple panels are used (it may be applied regardless of the panels).

[0119] In the present disclosure, TPMI and TPMI index may be interchangeable. Port and antenna port may be interchangeable. They may mean 8TX (8 transmissions), 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.

[0120] This disclosure mainly describes 8TX, but may also be applied to 5TX, 6TX, 7TX, or 8 or more TX in the same manner as in the case of 8TX.

[0121] (Wireless communication method) In the present disclosure, a scaling factor, a power factor, an amplitude factor, a power scaling coefficient, a scaling coefficient, and a scaling value may be interchangeable. In the present disclosure, the number of existing precoders to be reused is not limited to two, and may be one or more.

[0122] The precoder type to which each of the following embodiments is applied may be at least one of fully coherent, partially coherent, and non-coherent.

[0123] In this disclosure, the existing precoder that is reused for the new precoder is a 4-port UL precoder (W ４ＴＸ ), as well as the 2-port UL precoder (W ２ＴＸ ) may also be used.

[0124] First Embodiment The first embodiment relates to determining a scaling factor when a scaling factor corresponding to an existing precoder is not maintained (reused).

[0125] The UE uses one or two existing precoders W ４ＴＸ (Hereinafter, P １ / P ２ ) to form an 8-port UL precoder, the scaling factors may be determined as follows (subject to the following conditions):

[0126] The UE uses two existing precoders P １ , P ２ In this case, the UE may recalculate the scaling factor (pow shown below) for the new 8-port UL precoder. The total power may be associated with the port numbers used in all layers.

[0127] For example, when all ports (8 ports) are used, i.e., in the case of a fully coherent precoder, the total power is 1. When only 1 port out of 8 ports is used, the total power is 1 / 8. When X ports out of 8 ports are used, the total power is X / 8.

[0128] For example, in the case of an 8-port UL precoder of a certain layer, two existing precoders P １ , P ２ Any combination of these may be supported. For example, in the case of five layers, three layers plus two layers may be supported, or four layers plus one layer may be supported. In any combination, the method for determining the scaling factor may be the same.

[0129] The above-described method of determining the scaling factor is not limited to a fully coherent precoder, but can also be applied to a partially coherent / non-coherent precoder when uplink full power transmission for PUSCH is not configured.

[0130] 16A to 16C are diagrams illustrating an example of a precoder to which a scaling factor according to the first embodiment is applied. 17A and 17B are diagrams illustrating another example of a precoder to which a scaling factor according to the first embodiment is applied.

[0131] Existing precoders (P １ , P ２ ) does not have an original scaling factor (the first element is 1 as shown in FIG. 17A), the final scaling factor (pow) of the 8-port UL precoder may be calculated based on the formula shown in FIG. 17B, for example. For example, X in FIG. 17B may indicate the number of non-zero elements (the total number of elements whose value is not zero).

[0132] The UE may determine one scaling factor corresponding to one 8-port UL precoder. That is, one scaling factor (pow) may be associated with one 8-port UL precoder. In other words, the existing precoder (P １ , P ２) may be applied.

[0133] The UE may determine the scaling factor to apply to the new 8-port UL precoder based on at least one of the following: the number of layers of the new 8-port UL precoder; the number of ports used in all layers of the new 8-port UL precoder; the existing precoder (P １ , P ２ ) / number of non-zero elements in the new 8-port UL precoder, Exact codebook (TPMI).

[0134] The scaling factor may be determined in advance in the specification or may be notified to the UE using higher layer signaling / DCI.

[0135] The above-described method for determining the scaling factor may be applied depending on the precoder type, as shown in FIGS.

[0136] 18A is a diagram showing an example in which the scaling factor according to the first embodiment is applied to a five-layer fully coherent precoder. FIG. 18B shows an example of calculation of the scaling factor (pow) in FIG. 18A. FIG. 18 corresponds to the precoder in FIG. 16A, for example, and is a diagram showing an example of calculation of the scaling factor (pow) in FIG. 18A. １ , P ２ ) may be reused (selected), and phase adjustment may be applied (considered).

[0137] 19A is a diagram showing an example in which the scaling factor according to the first embodiment is applied to a 5-layer partially coherent precoder. FIG. 19B shows an example of calculation of the scaling factor (pow) in FIG. 19A. FIG. 19 corresponds to the precoder in FIG. 16B, for example, and is different from the existing precoder (P １ , P ２ ) may be reused (selected).

[0138] 20A is a diagram showing an example in which the scaling factor according to the first embodiment is applied to a 4-layer partially coherent precoder. FIG. 20B shows an example of calculation of the scaling factor (pow) in FIG. 20A. FIG. 20 corresponds to the precoder in FIG. 16C, for example, and is a diagram showing an example of calculation of the scaling factor (pow) in FIG. 20A. １ ) may be reused (selected).

[0139] According to the first embodiment described above, the UE can appropriately determine the scaling factor corresponding to the new precoder.

[0140] Second Embodiment The second embodiment relates to determining a scaling factor when a scaling factor corresponding to an existing precoder is maintained (reused).

[0141] The UE uses one or two existing precoders W ４ＴＸ (Hereinafter, P １ / P ２ ) to form an 8-port UL precoder, the scaling factors may be determined as follows (subject to the following conditions):

[0142] The UE uses two existing precoders P １ , P ２ In this case, the UE may maintain (reuse) the scaling factor corresponding to the existing precoder P １ , P ２ That is, the UE may determine a scaling factor corresponding to each layer of the existing precoder P １ , P ２ A different scaling factor (pow1, pow2, described later) may be determined for each of the inputs.

[0143] For example, P １ is the L1 layer, P ２ is assumed to be the L2 layer. Here, L1 and L2 may be the number of layers corresponding to the respective precoders. In this case, P １ The power of can be expressed as L1 / (L1+L2), and P ２The power of P can be expressed as L2 / (L1+L2). Therefore, the power of each layer can be expressed as 1 / (L1+L2). That is, P １ , P ２ The power allocation between the L1 and L2 channels can be expressed as L1 / L2.

[0144] So, P １ , P ２ Regarding the power distribution between P １ , P ２ It is necessary to specify the scaling factors (pow1, pow2) corresponding to each of the above. １ , P ２ To achieve power allocation between L1 and L2, scaling factors (pow1, pow2) may be associated with port numbers used in all layers (e.g., eight layers). The scaling factors may be calculated based on the following formula:

[0145] 21 to 23 are diagrams illustrating an example of a precoder to which a scaling factor according to the second embodiment is applied. For example, in FIGS. 21A and 21B, P １ 21B shows the case of a fully coherent 4-port precoder. In FIG. 21, the scaling factors may be expressed as pow1 = √(L1 / 2(L1+L2)) and pow2 = √(L2 / 2(L1+L2)), respectively. As shown in FIG. 21B, the total power of the scaling factors (pow1, pow2) may be 1.

[0146] In Figures 22A and 22B, P １ 22B shows the case of a fully coherent 4-port precoder. In FIG. 22, the scaling factors may be expressed as pow1 = √(L1 / (L1+L2)) and pow2 = √(L2 / (L1+L2)), respectively. As shown in FIG. 22B, the total power of the scaling factors (pow1, pow2) may be 1.

[0147] 23A and 23B, a fully coherent four-port precoder P １In this case, it is not necessary to consider L1 and L2, and the scaling factor may be determined (calculated) in the same manner as in the first embodiment. In addition, the total power of the scaling factor (pow1) may be 4 / 8.

[0148] The UE may determine one or more scaling factors corresponding to one 8-port UL precoder. That is, one or more scaling factors (pow1, pow2) may be associated with one 8-port UL precoder. In other words, the existing precoder (P １ , P ２ ) may apply common or different scaling factors.

[0149] The UE may determine the scaling factor to apply to the new 8-port UL precoder based on at least one of the following: １ , P ２ ) number of layers, and the existing precoder (P １ , P ２ ) layer number ratio (L1 / L2), the existing precoder (P １ , P ２ ) number of ports used in all layers, and the existing precoder (P １ , P ２ ) the number of non-zero elements in the exact codebook (TPMI).

[0150] The scaling factors (pow1, pow2) may be determined in advance in a specification, or may be notified to the UE using higher layer signaling / DCI.

[0151] The above-described method for determining the scaling factor may be applied depending on the precoder type, as shown in FIG.

[0152] 24A-24C are diagrams showing specific examples of precoders to which scaling factors according to the second embodiment are applied. Fig. 24A shows an example in which the existing precoder of Fig. 14 is applied to Fig. 21 (a five-layer fully coherent precoder). Fig. 24B shows an example in which the existing precoder of Fig. 14 is applied to Fig. 22 (a five-layer partially coherent precoder). Fig. 24C shows an example in which the existing precoder of Fig. 14A is applied to Fig. 23 (a four-layer partially coherent precoder).

[0153] According to the second embodiment described above, the UE can appropriately determine a scaling factor corresponding to a new precoder using an existing precoder.

[0154] <Supplementary Information> [Notification of Information to UE] In the above-described embodiments, any information may be notified 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) 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.

[0155] 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.

[0156] 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.

[0157] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0158] [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.

[0159] 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.

[0160] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0161] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0162] [Application of Each Embodiment] At least one of the above-described embodiments may be applied when a specific condition is met. The specific condition may be defined in a standard or may be notified to a UE / BS using higher layer signaling / physical layer signaling.

[0163] At least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.

[0164] The specific UE capabilities may indicate at least one of the following: - Supporting specific processing / operations / control / information for at least one of the above embodiments; - Regarding precoder type; - Supporting phase alignment between coherent groups.

[0165] 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).

[0166] 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)).

[0167] Furthermore, at least one of the above-described embodiments may be applied when the UE is configured / activated / triggered with specific information related to the above-described embodiment (or performing the operations of the above-described embodiment) by higher layer signaling / physical layer signaling. For example, the specific information may be information indicating that 8TX UL transmission is enabled, any RRC parameter for a specific release (e.g., Rel. 18 / 19), etc.

[0168] If the UE does not support at least one of the specific UE capabilities or is not configured with the specific information, the UE may apply, for example, Rel. 15 / 16 behavior.

[0169] (Supplementary Notes) The following inventions are supplemented with respect to one embodiment of the present disclosure. [Supplementary Note 1] A terminal including: a controller that determines an 8-port precoder based on a 4-port or less precoder; and a transmitter that performs uplink transmission based on the 8-port precoder, wherein the controller determines a scaling factor to be applied to the 8-port precoder based on a certain condition. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the controller determines the scaling factor based on the number of non-zero elements of the 8-port precoder. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the controller determines the scaling factor based on another scaling factor to be applied to the 4-port or less precoder. [Supplementary Note 4] The terminal according to any one of Supplementary Notes 1 to 3, wherein the controller determines the scaling factor based on the number of layers, the number of ports, and the number of non-zero elements associated with the 4-port or less precoder or the 8-port precoder.

[0170] (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.

[0171] 25 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).

[0172] 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.

[0173] 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.

[0174] 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))).

[0175] 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.

[0176] 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).

[0177] 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.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0183] 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).

[0184] 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.

[0185] 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.

[0186] 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.

[0187] 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).

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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).

[0197] 26 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.

[0198] 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.

[0199] 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.

[0200] 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.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] 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.

[0208] 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.

[0209] 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.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] The transceiver 120 may transmit, to the terminal, configuration information for determining an 8-port precoder based on a 4-port or less precoder. The transceiver 120 may perform uplink reception based on the 8-port precoder.

[0215] The control unit 110 may control the determination of an eight-port precoder based on four-port or less precoders.

[0216] (User Terminal) Fig. 27 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.

[0217] 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.

[0218] 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.

[0219] 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.

[0220] 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.

[0221] 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.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] 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.

[0230] 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.

[0231] 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.

[0232] 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.

[0233] The transceiver unit 220 may perform uplink transmission based on the eight-port precoder.

[0234] The control unit 210 may determine an 8-port precoder based on a 4-port or less precoder. The control unit 210 may determine a scaling factor to be applied to the 8-port precoder based on a certain condition. The control unit 210 may determine the scaling factor based on the number of non-zero elements in the 8-port precoder. The control unit 210 may determine the scaling factor based on another scaling factor to be applied to the 4-port or less precoder. The control unit 210 may determine the scaling factor based on the number of layers, the number of ports, and the number of non-zero elements associated with the 4-port or less precoder or the 8-port precoder.

[0235] (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.

[0236] 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.

[0237] 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. Figure 28 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.

[0238] 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.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] 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.

[0243] 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.

[0244] 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.

[0245] 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.

[0246] 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).

[0247] 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.

[0248] 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.

[0249] (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.

[0250] 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.

[0251] 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.

[0252] 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.

[0253] 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.

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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.

[0262] 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.

[0263] 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.

[0264] 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.

[0265] 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.

[0266] 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.

[0267] 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."

[0268] 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.

[0269] 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.

[0270] 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.

[0271] 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.

[0272] 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.

[0273] 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.

[0274] 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.

[0275] 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).

[0276] 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).

[0277] 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).

[0278] 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.

[0279] 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.

[0280] 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).

[0281] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0282] 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.

[0283] 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.

[0284] 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.

[0285] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0286] 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.

[0287] 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.

[0288] 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.

[0289] 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.

[0290] 29 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.

[0291] 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.

[0292] 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).

[0293] 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.

[0294] 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.

[0295] 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.

[0296] 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.

[0297] 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.

[0298] 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).

[0299] 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.

[0300] 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)).

[0301] 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.

[0302] 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.

[0303] 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.

[0304] 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.

[0305] 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.

[0306] 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).

[0307] 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."

[0308] 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.

[0309] 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.

[0310] 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.

[0311] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "deciding" some action.

[0312] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0313] 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.

[0314] 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."

[0315] 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.

[0316] 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."

[0317] 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.

[0318] 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.

[0319] 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").

[0320] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0321] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. a control unit that determines an 8-port precoder based on a 4-port or less precoder; a transmitter that performs uplink (UL) transmission based on the 8-port precoder, The control unit determines a scaling factor to be applied to the 8-port precoder based on a scaling factor applied to the 4-port or less precoder.

2. determining an 8-port precoder based on the 4-port or less precoder; performing an uplink (UL) transmission based on the 8-port precoder; determining a scaling factor to be applied to the 8-port precoder based on a scaling factor applied to the 4-port or less precoder.

3. a control unit that determines that an 8-port precoder is determined based on a 4-port or less precoder; a receiving unit that performs uplink (UL) reception based on the 8-port precoder, A base station, wherein a scaling factor to be applied to the 8-port precoder is determined based on a scaling factor to be applied to the 4-port or less precoder.

4. A system having a terminal and a base station, The terminal a control unit that determines an 8-port precoder based on a 4-port or less precoder; a transmitter that performs uplink (UL) transmission based on the 8-port precoder, The control unit determines a scaling factor to be applied to the 8-port precoder based on a scaling factor to be applied to the 4-port or less precoder; The base station A system having a receiver for receiving said UL transmission.