Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to one embodiment of the present disclosure is characterized by comprising: a reception unit for receiving downlink control information including information relating to a codebook subset that indicates a 2-port precoder for each layer; and a control unit for determining an 8-port partially-coherent precoder for uplink transmission on the basis of the 2-port precoder indicated by the information. The terminal is also characterized in that the downlink control information includes a field that corresponds to rank 0. According to one embodiment of the present disclosure, it is possible to appropriately control UL transmission that uses 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] Existing standards require support for a unified design of precoding matrix tables (codebooks) and a unified design for reporting downlink control information related to determining precoding matrices.

[0007] However, the above-mentioned unified design may hinder individual preferred configurations of precoding matrices or cause an increase in the bit size of downlink control information, which may inhibit an increase in communication throughput.

[0008] 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.

[0009] A terminal according to one aspect of the present disclosure includes: a receiving unit that receives downlink control information including information on a codebook subset that indicates a two-port precoder for each layer; and a control unit that determines an eight-port partially coherent precoder for uplink transmission based on the two-port precoder indicated by the information, wherein the downlink control information includes a field corresponding to rank 0.

[0010] According to one aspect of the present disclosure, UL transmission using more than four antenna ports can be appropriately controlled.

[0011] Figure 1 is a diagram showing an example of a table of precoding matrices W for single-layer (rank-1) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 2 is a diagram showing an example of a table of precoding matrices W for two-layer (rank-2) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 3 is a diagram showing an example of a table of precoding matrices W for three-layer (rank-3) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 4 is a diagram showing an example of a table of precoding matrices W for four-layer (rank-4) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 5A is a diagram showing an example of a table of precoding matrices W for single-layer (rank-1) transmission using two antenna ports in Rel. 16 NR. Figure 5B is a diagram showing an example of a table of precoding matrices W for two-layer (rank-1) transmission using two antenna ports in Rel. 16 NR.

[0033] Figure 6 is a diagram showing an example of a table of precoding matrices W for two-layer (rank-2) transmission using two antenna ports when transform precoding is disabled in Rel. 16 NR. Figure 6 is a diagram showing an example of 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 are diagrams showing an SRI indication or a second SRI indication when transmitting a codebook-based PUSCH in Rel. 17. Figure 8 is a diagram showing an example of an antenna layout for eight antenna ports. Figure 9 is a diagram showing an example of a table used to determine the number of layers / TPMI index when supporting more than four antenna ports. Figures 10A and 10B are diagrams showing examples of tables of precoding matrices W for one- and eight-layer (rank-1 and rank-8) transmission using eight antenna ports when transform precoding is disabled. Figure 10C is a diagram showing an example of the correspondence between the field values ​​of precoding information and number of layers and the number of layers and TPMI.11A-11C are diagrams showing an example of a table of precoding matrices W for one-layer (rank-1) transmission using eight antenna ports when transform precoding is disabled. FIGS. 11D-11F are diagrams showing an example of a table of precoding matrices W for eight-layer (rank-8) transmission using eight antenna ports when transform precoding is disabled. FIGS. 12A-12D are diagrams showing an example of a correspondence between field values ​​for precoding information and number of layers and the content specified. FIG. 13 is a diagram showing another example of a correspondence between field values ​​for precoding information and number of layers and the number of layers and TPMI. FIG. 14A is a diagram showing an example of a new three-layer precoder achieved by reusing an existing four-port partially coherent precoder. FIG. 14B is a diagram showing an example of a six-layer precoder with four layers from one coherent group and two layers from another coherent group. FIG. 15A is a diagram showing an example of a four-layer precoder with two layers from one coherent group and two layers from another coherent group. FIG. 15B is a diagram showing an example of an 8-layer precoder using four 2-layer precoders from four coherent groups. FIG. 16A is a diagram showing the number of existing 4-port precoders shown in FIGS. 1-4. FIG. 16B is a diagram showing the number of existing 2-port precoders shown in FIGS. 5A-5B. FIG. 17 is a diagram showing an example of the correspondence between the field values ​​of precoding information and number of layers, and the number of layers and TPMI. FIGS. 18A-18B show N. ｇFIG. 19 is a diagram showing the association between ranks and the number of precoders. FIGS. 20A and 20B are diagrams showing the association between ranks and precoders according to the first embodiment. FIG. 21 is a diagram showing an example of a DCI field according to the first embodiment. FIG. 22 is a diagram showing an example of the association between ranks and fields A and B according to the second embodiment. FIG. 23 is a diagram showing another example of the association between ranks and fields A and B according to the second embodiment. FIG. 24 is a diagram showing an example of a DCI field according to the second embodiment. FIG. 25 is a diagram showing an example of interpretation of field B according to the second embodiment. FIG. 26 is a diagram showing the association between the number of precoders and index for each rank according to a modification of the second embodiment. FIGS. 27A and 27B are diagrams showing the association between ranks and the number of precoders according to the third embodiment. FIG. 28 is a diagram showing an example of the correspondence between field values ​​of precoding information and number of layers, the number of layers, and TPMI according to the third embodiment. FIG. 29 is a diagram showing an example of a DCI field according to the third embodiment. FIG. 30 is a diagram showing an example of a DCI field according to the third embodiment. ｇ FIG. 31 is a diagram illustrating an example of an association between ranks and layers in RANK=4. FIG. 32 is a diagram illustrating an example of interpretation of field B according to the fourth embodiment. FIG. 33 is a diagram illustrating an association between the number of precoders and indexes for each rank according to a modification of the fourth embodiment. FIG. 34 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 35 is a diagram illustrating an example of a configuration of a base station according to an embodiment. FIG. 36 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. FIG. 37 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to an embodiment. FIG. 38 is a diagram illustrating an example of a vehicle according to an embodiment.

[0012] (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)).

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

[0014] An SRS resource set may be associated with (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).

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

[0016] Here, the SRS resource type may indicate any one of periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic CSI (Aperiodic SRS (A-SRS)). Note that the UE may transmit P-SRS and SP-SRS periodically (or periodically after activation), and transmit A-SRS based on an SRS request in the DCI.

[0017] Furthermore, the 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.

[0018] 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.

[0019] The SRS resource information may include an SRS resource ID (SRS-ResourceId), the number of SRS ports, the SRS port number, a transmission comb, an SRS resource mapping (e.g., time and / or frequency resource position, resource offset, resource period, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), hopping-related information, an SRS resource type, a sequence ID, spatial relationship information of the SRS, etc.

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

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

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

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

[0024] When the UE is configured with spatial relationship information regarding 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.

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

[0026] The UE may determine the spatial relationship of the PUSCH scheduled by the DCI (e.g., DCI format 0_1) based on the value of a predetermined field (e.g., an SRS resource identifier (SRI) field) in the DCI. Specifically, the UE may use spatial relationship information of the SRS resources (e.g., the RRC information element "spatialRelationInfo") determined based on the value of the predetermined field (e.g., the SRI) for PUSCH transmission.

[0027] In Rel. 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.

[0028] 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.

[0029] 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).

[0030] 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.

[0031] 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.

[0032] 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."

[0033] 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.

[0034] (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.

[0035] 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.

[0036] 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.

[0037] 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").

[0038] 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.

[0039] 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").

[0040] 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."

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Figure 1 shows an example of the association between codebook subsets and TPMI indices. Figure 1 corresponds to a table of precoding matrices W for single-layer (rank-1) transmission using four antenna ports when transform precoding (also called a transform precoder) is disabled in Rel. 16 NR. Figure 1 shows the corresponding Ws in ascending order of TPMI indices from left to right (similar to Figure 2).

[0046] The correspondence relationship (which may be called a table) showing the TPMI index and the corresponding W as shown in Fig. 1 is also called a codebook. A part of this codebook is also called a codebook subset.

[0047] In Fig. 1, if the codebook subset is fully, partially, and non-coherent, the UE is notified of a TPMI (TPMI index) of 0 to 27 for single-layer transmission. If the codebook subset is partial and non-coherent, the UE is configured with a TPMI of 0 to 11 for single-layer transmission. If the codebook subset is non-coherent, the UE is configured with a TPMI of 0 to 3 for single-layer transmission.

[0048] In Fig. 1, when a TPMI of 0 to 3 is notified, a non-coherent precoder is applied. When a TPMI of 4 to 11 is notified, a partially coherent precoder is applied. When a TPMI of 12 to 27 is notified, a fully coherent precoder is applied.

[0049] 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.

[0050] 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).

[0051] 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).

[0052] 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).

[0053] 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.

[0054] According to Figure 5A, the TPMI signaled to the UE for two-port single layer transmission is between 0 and 5 (codebook subsets are full, partial, and non-coherent) or between 0 and 1 (codebook subset is non-coherent). If the signaled TPMI is between 0 and 1, a non-coherent precoder is applied. If the signaled TPMI is between 2 and 5, a fully coherent precoder is applied.

[0055] According to FIG. 5B, the TPMI that the UE is informed of for two-port two-layer transmission is between 0 and 2 (codebook subset complete, partial and non-coherent) or 0 (codebook subset non-coherent).

[0056] 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.

[0057] The non-coherent codebook and the partially coherent codebook may be referred to as an antenna selection precoder, an antenna port selection precoder, etc. For example, the non-coherent codebook (non-coherent precoder) may be referred to as a 1-port selection precoder, a 1-port port selection precoder, etc. Furthermore, the partially coherent codebook (partially coherent precoder) may be referred to as an x-port (x is an integer greater than 1) selection precoder, an x-port port selection precoder, etc. The fully coherent codebook may be referred to as a non-antenna selection precoder, a full-port precoder, etc. In the present disclosure, the terms codebook, codebook subset, and precoder may be interchangeable.

[0058] 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).

[0059] 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).

[0060] As can be seen from Figures 5A and 5B, there is no partially coherent precoder for two-antenna port transmission, so the setting in which the codebook subset is partial and non-coherent does not need to be applied to two-antenna ports.

[0061] (Precoding Information Field) As described above, the UE may determine the TPMI and the number of layers (transmission rank) for a PUSCH based on the precoding information field of the DCI (e.g., DCI format 0_1 / 0_2) that schedules the PUSCH.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] (SRS configuration for codebook-based PUSCH) Fig. 7A shows the SRS configuration in Rel. 17 when ul-FullPowerTransmission is not set, or ul-FullPowerTransmission = fullpowerMode1, or ul-FullPowerTransmission = fullpowerMode2, or ul-FullPowerTransmission = fullpower and N SRS 7B is a diagram showing an SRI indication or a second SRI indication when transmitting a codebook-based PUSCH when ul-FullPowerTransmission=fullpowerMode2 and N SRS 7C is a diagram showing an SRI indication or a second SRI indication for codebook-based PUSCH transmission when ul-FullPowerTransmission=fullpowerMode2 and N SRS 10 shows an SRI indication or a second SRI indication for codebook-based PUSCH transmission when .SIGMA.=4.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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".

[0076] 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.

[0077] (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.

[0078] 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.

[0079] 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.

[0080] Each coherent group may correspond to a different transmit panel / transmit chain / SRS resource set / RS resource set / spatial relation information / joint Transmission Configuration Indication state (joint TCI state) / UL TCI state / received TRP. Here, the SRS resource set may specifically correspond to an SRS resource set used for codebook or non-codebook. Also, each coherent group may correspond to a different received TRP. Also, the coherent group may be referred to as a coherent antenna group, a port group, an antenna set, etc.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.).

[0086] (Precoding Matrix Table) For example, for i-layer (e.g., i = 1, 2, ..., 8) transmission for UL with 8 Tx / antenna ports, a precoding matrix (or TPMI matrix) and a TPMI index (or precoding matrix table) may be introduced / supported for each i-layer.

[0087] In this case, in a non-coherent precoder (for example, a 1-port port selection precoder), the number of precoders in the i-th layer is X ＮＣ，ｉ In this case, the TPMI index corresponding to non-coherent is 0 to X. ＮＣ，ｉ It may also be -1.

[0088] In addition, in a partially coherent precoder (e.g., an x-port port selection precoder (x=2 / 4 / 6)), the number of precoders in the i-th layer is X ＰＣ，ｉ In the case of ＮＣ，ｉ ~ (X ＮＣ，ｉ +X ＰＣ，ｉ -1).

[0089] In addition, in the fully coherent precoder, the number of precoders in the i layer is X ＦＣ，ｉ , the TPMI index corresponding to perfect coherence is (X ＮＣ，ｉ +X ＰＣ，ｉ ) ~ (X ＮＣ，ｉ +X ＰＣ，ｉ +X ＦＣ，ｉ -1-1).

[0090] 9 is a diagram showing an example of a table used to determine the number of layers / TPMI index when supporting more than four antenna ports. More specifically, FIG. 9 is a diagram showing an example of an association (or table) between code points of predetermined fields of DCI (e.g., precoding information and layer number fields) and the number of layers / TPMI index.

[0091] 9 illustrates a case where there are 8 antenna ports, the transform precoder is disabled, and the maximum rank (e.g., maxRank) is 2, 3, 4, 5, 6, 7, or 8. Also, FIG. 9 may be applied when full power transmission (e.g., ul-FullPowerTransmission) is not set, or full power mode 2 (e.g., fullpowerMode2) is set, or full power (e.g., fullpower) is set.

[0092] The bit size of a predetermined field of DCI may be defined differently for each of a plurality of codebook subsets, and the bit size may be defined / set differently for each codebook subset based on the maximum rank (e.g., maxRank).

[0093] The left part of Figure 9 corresponds to the case where the codebook subset is noncoherent, the center part of Figure 9 corresponds to the case where the codebook subset is partial and noncoherent, and the right part of Figure 9 corresponds to the case where the codebook subset is fully, partial, and noncoherent.

[0094] 9 also illustrates a case where the number of code points (or bit size) corresponding to the number of layers / TPMI index when the codebook subset is noncoherent is smaller than that of other codebook subsets (e.g., partialAndNonCoherent / fullyAndPartialAndNonCoherent). It also illustrates a case where the number of code points (or bit size) corresponding to the number of layers / TPMI index when the codebook subset is partial and noncoherent is smaller than that of other codebook subsets (e.g., fullyAndPartialAndNonCoherent).

[0095] If the codebook subset is non-coherent, one or more TPMI indices are defined for each layer. For example, X for the i layer. ＮＣ，ｉ TPMI indexes may be supported / configured. ＮＣ，ｉ may be the number of non-coherent precoders corresponding to the i layer.

[0096] When the codebook subset is partial and noncoherent, a TPMI index corresponding to partial coherence is defined for each layer in addition to a TPMI index corresponding to noncoherence. For example, for the i layer, ＮＣ，ｉ Plus X ＰＣ，ｉ TPMI indexes may be supported / configured. ＰＣ，ｉ may be the number of partially coherent precoders corresponding to the i layer.

[0097] When the codebook subset is fully, partially, and noncoherent (fullyAndPartialAndNonCoherent), a TPMI index corresponding to noncoherence and a TPMI index corresponding to partial coherence are defined for each layer, as well as a TPMI index corresponding to fully coherent. For example, for the i layer, ＮＣ，ｉ and X ＰＣ，ｉ In addition, X ＦＣ，ｉ TPMI indexes may be supported / configured. ＦＣ，ｉ may be the number of fully coherent precoders corresponding to the i layer.

[0098] The number of TPMI indices (or the number of precoders) supported may be set separately for each number of layers. For example, as the number of layers increases, the number of TPMI indices (or the number of precoders) supported may be set to be smaller. In this case, the number of TPMI indices supported may be the same for some numbers of layers.

[0099] In this way, a codepoint corresponding to the number of layers / TPMI index when the codebook subset is noncoherent may also be applied (or set to be the same) when the codebook subset is partial and noncoherent. Also, a codepoint corresponding to the number of layers / TPMI index when the codebook subset is partial and noncoherent may also be applied (or set to be the same) when the codebook subset is full and partial and noncoherent.

[0100] In this way, when eight antenna ports / layers are supported in the UL, the correspondence between at least some code points in a predetermined field of DCI and the number of layers / TPMI index is set in common in multiple codebook subsets, thereby suppressing an increase in overhead in the predetermined field of DCI.

[0101] The number of layers and the TPMI index are indicated to the UE by each code point (or field index) in a predetermined field of the DCI. The UE may determine the number of layers / TPMI index (or precoding matrix) to be used for UL transmission based on the value of the code point in the predetermined field of the DCI. The base station may indicate the number of layers / TPMI index (or precoding matrix) to be used for UL transmission to the UE by the code point in the predetermined field of the DCI.

[0102] The table shown in Figure 9 may be applied in specific cases. For example, if eight antenna ports / Tx / layers are configured for UL transmission (e.g., PUSCH / SRS) by RRC / MAC CE / DCI, the table in Figure 9 may be applied. Otherwise, a table for two / four antenna ports (e.g., a table defined in Rel. 16 or earlier) may be applied.

[0103] 9 illustrates a case where a combination of the number of layers and the TPMI index corresponds to a code point (or a field index) of a predetermined field of DCI, but this is not limiting. The number of layers and the TPMI index may be separately configured to correspond to each other (or may be separately instructed to the UE).

[0104] Number of TPMIs (or number of precoders) supported in each layer (e.g., i layer) for 8 antenna ports X ＮＣ，ｉ , X ＰＣ，ｉ , X ＦＣ，ｉmay be configured by the RRC / MAC CE. In this case, the bit size of a predetermined field of DCI (e.g., the precoding information and the number of layers field) may be configured to be the same as that of other antenna ports (e.g., four antenna ports).

[0105] Alternatively, the bit size of a predetermined field of a DCI corresponding to eight antenna ports and the bit size of a predetermined field of a DCI corresponding to other antenna ports (e.g., four antenna ports) may be set separately (e.g., differently).

[0106] 9 shows a table in which the maximum rank for eight antenna ports is 2, 3, 4, 5, 6, 7, or 8, but is not limited to this. A table in which the maximum rank for eight antenna ports is less than 8 (for example, 2, 3, 4, 5, 6, or 7) may be defined / set separately. In this case, the table may be configured to correspond to two or three codebook subsets.

[0107] 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.

[0108] Generalized tables for 8-port transmission are described with reference to Figure 10. Figures 10A-10B show example tables of precoding matrices W for 1- and 8-layer (rank 1 and 8) transmissions with 8 antenna ports, respectively, when transform precoding is disabled.

[0109] In this example (and subsequent similar drawings), X ｉ(i is the number of layers) denotes the number of noncoherent precoders for layer number i, and Y ｉ denotes the number of partially coherent precoders for layer number i, and Z ｉ denotes the number of fully coherent precoders for the number of layers i. Note that X shown in Fig. 10 and subsequent figures ｉ , Y ｉ , Z ｉ are the X in FIG. ＮＣ，ｉ , X ＰＣ，ｉ , X ＦＣ，ｉ may correspond to.

[0110] As shown in FIGS. 10A and 10B, the codebook for the i layer includes X ｉ +Y ｉ +Z ｉ precoders are included, and based on this codebook, the non-coherent UEs are assigned a TPMI index (0 to X ｉ -1) depending on ｉ precoders, and partially coherent UEs can refer to TPMI indices (0 to X ｉ +Y ｉ -1) depending on ｉ +Y ｉ precoders, and fully coherent UEs can refer to TPMI indices (0 to X ｉ +Y ｉ +Z ｉ -1) depending on ｉ +Y ｉ +Z ｉ It is possible to refer to precoders.

[0111] 10C 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. The correspondence in this example is for 8 antenna ports when the transform precoder is disabled, the maximum rank (maxRank) is set to a value of 5 or more, 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. FIG. 10C is similar to FIG. 6, but the number of layers may be specified as 5 or more. Also, in FIG. 10C, the noncoherent precoder has a field value (bit field mapped to an index) of 0 to 2. Ｎ１ A partially coherent precoder can be indicated by field value = 2 Ｎ１ +1 to +2 Ｎ２ A fully coherent precoder can be indicated by field value = 2 Ｎ２ +1 to +2 Ｎ３ where N1 to N3 may be integers.

[0112] That is, if the codebook subset is noncoherent, the field value is 0 to 2. Ｎ１ If the codebook subset is partial and noncoherent, the field value is 0 to 2. Ｎ２ Furthermore, if the codebook subset is fully, partial, and noncoherent, the field value is 0 to 2. Ｎ３ is used.

[0113] The existing codebook includes multiple (all corresponding) coherent precoders according to the TPMI index, for example, as shown in Figures 2-5.

[0114] The new codebook subset may include at least one of a codebook subset for only a fully coherent precoder and a codebook subset for only a partially coherent precoder. The new codebook subset may include a codebook subset for only a noncoherent precoder. In other words, the new codebook subset may refer to a codebook subset for single coherency (or single coherence).

[0115] For example, a fully coherent UE may be configured with configuration information indicating a codebook subset for only a fully coherent precoder (e.g., an RRC parameter "codebookSubset" indicating "fully coherent" or "fully coherent only").

[0116] In addition, a partially coherent UE may be configured with configuration information indicating a codebook subset for only a partially coherent precoder (e.g., an RRC parameter "codebookSubset" indicating "partialCoherent" or "partialCoherentOnly").

[0117] Referring to FIG. 11, a case will be described in which a separate codebook (table of precoding matrices) is defined for each coherent type (for example, for each UE coherent type / codebook subset type to be set).

[0118] 11A-11C are diagrams showing examples of tables of precoding matrices W for one-layer (rank-1) transmission using eight antenna ports when transform precoding is disabled. Figures 11A, 11B, and 11C correspond to the cases where the UE is configured with a codebook subset for only a noncoherent precoder (nonCoherent), a codebook subset for only a partial coherent precoder (partialCoherent), and a codebook subset for only a fully coherent precoder (fullyCoherent), respectively.

[0119] 11D-11F are diagrams showing example tables of precoding matrices W for 8-layer (rank 8) transmission using 8 antenna ports when transform precoding is disabled. Figures 11D, 11E, and 11F correspond to the cases where the UE is configured with a codebook subset for only a noncoherent precoder (nonCoherent), a codebook subset for only a partial coherent precoder (partialCoherent), and a codebook subset for only a fully coherent precoder (fullyCoherent), respectively.

[0120] In this example, the codebook for the noncoherent precoder for the i layer contains X ｉ precoders, and based on this codebook, the non-coherent UE receives X ｉ In addition, the codebook for the partially coherent precoder for the i layer includes Y ｉ precoders, and based on the codebook, the partially coherent UE receives Y ｉ In addition, the codebook for the fully coherent precoder for the i layer contains Z ｉ precoders are included, and based on this codebook, a fully coherent UE can select Z ｉ It is possible to refer to precoders.

[0121] For convenience, the table for the codebook for the noncoherent precoder for the i layer is called table #iA, the table for the codebook for the partially coherent precoder for the i layer is called table #iB, and the table for the codebook for the fully coherent precoder for the i layer is called table #iC. In each table, the TPMI index may start from 0.

[0122] Note that instead of using separate tables for each new codebook subset as shown in Figures 11A-11F, one table including full / partial / noncoherent precoders as shown in Figures 10A and 10B may be used in common for the new codebook subsets.

[0123] In existing NR, for example, as shown in FIG. 6, a correspondence (e.g., a table) between the value of the precoding information field and the number of layers and TPMI is specified according to a codebook subset configured in the UE. Based on this correspondence, the UE determines the number of layers and TPMI index corresponding to the specified precoding information field. The UE determines the table (codebook) to refer to to determine the precoding matrix based on the number of layers. In existing NR, this correspondence cannot be associated with a codebook for a fully coherent precoder only, or a codebook for a partially coherent precoder only.

[0124] A new correspondence relationship may be defined separately for each coherent type / precoder (for example, for each coherent type of the UE / for each codebook subset type to be set).

[0125] For non-coherent UE / precoder / codebook subsets, the new correspondence may include a row indicating the layer number and the TPMI index (in a table of 1-layer to 8-layer precoding matrices for non-coherent precoders only).

[0126] In the present disclosure, a correspondence including a row may mean that an index for the correspondence (row index, e.g., a value in a precoding matrix field) is associated with an entry (or element, e.g., the number of layers, TPMI index) indicated by the row.

[0127] For fully coherent UE / precoder / codebook subsets, the new correspondence may include a row indicating at least one of the following: a pair of layer number and TPMI index (in a table of precoding matrices from 1 to 8 layers for fully coherent precoders only); a pair of layer number and TPMI index (in a table of precoding matrices from 1 to 8 layers for fully coherent precoders only); １，１ , i １，２ , i ２ and i １，３ ) set and a set of .

[0128] Here, (i １，１ , i １，２ , i ２ and i １，３ ) may be used to identify the precoder W of the DL Type I single panel codebook, for example, when the precoder W is used as the 8TX UL fully coherent precoder. １，１ , i １，２ , i ２ and i １，３ may be the same as the definition for the DL Type I single panel codebook.

[0129] For partially coherent UEs / precoders / codebook subsets, the new correspondence may include a row indicating at least one of the following: - a pair of layer numbers and TPMI index (in a table of precoding matrices from 1 to 8 layers for partially coherent precoders only), - a pair of layer numbers and one TPMI index (for different coherent groups), - multiple layer numbers / multiple TPMI indices (for different coherent groups).

[0130] Note that a new correspondence relationship may not be defined for a partially coherent UE / precoder / codebook subset, in which case, for example, a partially coherent UE may reuse one or more existing precoders to identify an 8-port precoder.

[0131] 12A to 12D are diagrams showing an example of a correspondence relationship between the field values ​​of the precoding information and the number of layers and the content to be specified. The correspondence relationship in this example is a correspondence relationship for 8 antenna ports when the transform precoder is set to disabled, the maximum rank (maxRank) is set to 8, and uplink full power transmission is not set, is set to full power mode 2 (fullpowerMode2), or is set to full power (fullpower), but is not limited to this.

[0132] Figure 12A shows a correspondence relationship for a UE configured with a codebook subset (nonCoherent) for only a noncoherent precoder. In the correspondence relationship in Figure 12A, an indication of the number of layers and a corresponding TPMI index are specified. The TPMI index indicates the TPMI index in table #iA, where i corresponds to the indication of the number of layers.

[0133] Figure 12B shows a correspondence relationship for a UE configured with a codebook subset for only a fully coherent precoder (fully coherent). In the correspondence relationship in Figure 12B, an indication of the number of layers and a corresponding TPMI index are specified. The TPMI index indicates the TPMI index in table #iC, where i corresponds to the indication of the number of layers.

[0134] Figure 12C shows a correspondence relationship for a UE configured with a codebook subset (partialCoherent) for only a partially coherent precoder. The correspondence relationship in Figure 12C specifies an indication of the number of layers and a corresponding TPMI index. The TPMI index indicates the TPMI index in table #iB, where i corresponds to the indication of the number of layers.

[0135] Note that configuring a codebook subset for only a non- / partially / fully coherent precoder may be interchangeable with specifying a codebook subset for only a non- / partially / fully coherent precoder by a DCI / MAC CE. The examples of Figures 12A-12C are appropriate when a UE can be configured with only one new codebook subset, but cannot be used as is when a UE can be configured with multiple new codebook subsets and one of the multiple new codebook subsets is indicated using a field of DCI (which may be referred to as a codebook subset specification field, for example) / MAC CE.

[0136] The correspondence relationships of each coherent type may be collectively defined in one table as shown in FIG.

[0137] 12D is a diagram showing an example of a correspondence relationship between the field values ​​of the precoding information and the number of layers and the content to be specified. The correspondence relationship in this example corresponds to a table in which the fully coherent codebook subset (fullyAndPartialAndNonCoherent) in FIG. 6 is replaced with a codebook subset (fullyCoherent) for only the fully coherent precoder, and the partially coherent codebook subset (partialAndNonCoherent) is replaced with a codebook subset (partialCoherent) for only the partially coherent precoder. Note that the number of bits in the bit field mapped to the index may be different from that in FIG. 6.

[0138] Specifically, in FIG. 12D, the non-coherent precoder has a field value (a bit field mapped to an index) of 0 to 2. Ｎ１ A partially coherent precoder can be indicated by field values ​​= 0 to 2. Ｎ４ A fully coherent precoder can be indicated by field values ​​= 0 to 2. Ｎ５ where N1, N4, and N5 may be integers.

[0139] The portion of the correspondence relationship for only the non-coherent precoder in Fig. 12D may correspond to the correspondence relationship in Fig. 12A. The portion of the correspondence relationship for only the fully coherent precoder in Fig. 12D may correspond to the correspondence relationship in Fig. 12B. The portion of the correspondence relationship for only the partially coherent precoder in Fig. 12D may correspond to the correspondence relationship in Fig. 12C.

[0140] 13 is a diagram showing another 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. The table in Fig. 13 shows an example in which the partially coherent codebook subsets in the table in Fig. 12D are expanded by dividing them into Ng=2 and Ng=4.

[0141] Specifically, in FIG. 13, the non-coherent precoder has a field value (a bit field mapped to an index) of 0 to 2. Ｎ１ The partially coherent precoder corresponding to Ng=2 can be indicated by field values=0 to 2. Ｎ４＿Ｎｇ２ The partially coherent precoder corresponding to Ng=4 can be indicated by field values ​​= 0 to 2. Ｎ４＿Ｎｇ４ A fully coherent precoder can be indicated by field values ​​= 0 to 2. Ｎ５ It should be noted that N1, N4_Ng2, N4_Ng4, and N5 may be integers.

[0142] As shown in FIG. 13, separate tables / indications may be defined for the partially coherent precoder corresponding to Ng=2 and the partially coherent precoder corresponding to Ng=4.

[0143] These tables allow the UE to properly determine the table of precoding matrices to refer to based on the precoding information field.

[0144] 14A is a diagram illustrating an example of a new three-layer precoder that reuses an existing four-port partially coherent precoder. In FIG. 14A, for example, the existing three-layer precoder shown in FIG. 3 is reused.

[0145] Figure 14B 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 Figures 2 and 4.

[0146] 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

[0147] Figure 15A 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.

[0148] 15B is a diagram illustrating an example of an 8-layer precoder using four 2-layer precoders from four coherent groups, in which the existing 2-layer precoder shown in FIG. 5B is reused.

[0149] (Constraints on Precoding Matrices) Figure 16A is a diagram showing the number of existing 4-port precoders shown in Figures 1 to 4. Figure 16A shows, for example, that 16 existing 4-port FC precoders are specified for rank 1, 8 for rank 2, 4 for rank 3, and 2 for rank 4.

[0150] 16B is a diagram illustrating the number of existing 2-port precoders shown in FIGS. 5A-5B. For example, FIG. 16B illustrates that four existing 2-port FC precoders are defined for rank 1 and two for rank 2.

[0151] If all 4-port / 2-port precoders are used (as selection candidates) to generate 8-port PC precoders, the number of 8-port PC precoders will become enormous, and there will be concerns about the increased overhead required to notify the TPMI index corresponding to the precoder to be used.

[0152] Therefore, studies are being conducted to reduce the number of available 8-port precoders and appropriately perform UL transmission using more than four antenna ports.

[0153] For example, N ｇ A, A constituting the precoder for 8TX UE at = 2, 4 １ , A ２ , A ３ , A ４ Constraints on the number of precoders may be applied based on a certain rule. The certain rule may be, for example, at least one of the following: - Only FC precoders or only PC precoders are allowed as precoders; - Only precoders based on a certain rule are allowed as precoders; - For a certain rank, only a part of existing precoders is allowed; - Applicable precoders are selected by a combination of allowed ranks for multiple antenna groups; - Applicable precoders are selected by a set of allowed antenna groups; - Allowed A １ -A ４ An applicable precoder is selected by the set of .

[0154] When using a specific precoder (type 2 precoder), under specific conditions, １ and A ２ The specific condition may be, for example, a constraint that A １ Rank and A ２ The ranks of the two elements may be the same.

[0155] In the present disclosure, the terms "precoding matrix constraint" and "precoder selection" may be interchangeable. In addition, in the present disclosure, some precoders are selected from existing precoders to generate an 8-port PC precoder. In the present disclosure, this "selection" may mean being specified in advance in a standard, being set by higher layer signaling, or being reported (or determined) by UE capability information. This "selection" may be performed for each rank / coherent type / TX count, or may be performed across multiple ranks / coherent types / TX counts. Note that higher layer signaling may specify a set of precoders that can be specified by physical layer signaling (e.g., DCI). The same applies to other embodiments.

[0156] (SRS Configuration and TPMI Indication for Codebook-Based PUSCH in 8TX) When a UE supports UL (PUSCH) transmission of up to 8 layers and has 8TX (8 antenna ports), the UE may receive DCI (e.g., DCI format 0_1 / 0_2) including multiple fields for codebook-based PUSCH transmission, including at least one of a precoding information and number of layers field and an extended TPMI field. The UE may control UL transmission using 8TX based on the DCI.

[0157] At least one of a plurality of precoding information and layer number fields and the TPMI field may correspond to a plurality of coherent groups that the terminal has, respectively.

[0158] For a UE with two coherent groups and four ports per group, the TPMI per coherent group or the rank of the scheduled PUSCH may be indicated using two fields of the extended TPMI. The indicated TPMI and rank are determined by reusing the existing 4TX UL codebook and TPMI index table.

[0159] For a UE with four coherent groups and two ports per group, the four fields of the extended TPMI may be used to indicate the TPMI for each coherent group or the rank of the scheduled PUSCH. The indicated TPMI and rank are determined by reusing the existing 2TX UL codebook and TPMI index table.

[0160] For a UE with two coherent groups, if the two "SRS resource indication" fields are enabled, the following options are possible:

[0161] Option 1: The two fields of the "Extended TPMI" can reuse the existing "Precoding Information and Number of Layers" field table for four antenna ports (Fig. 6). That is, the UE may determine the indication of the TPMI field using the same table as for the Precoding Information and Number of Layers field. Thus, one field indicates both the layer and the TPMI index of the coherent group / SRS resource in the corresponding SRS resource set.

[0162] <<Option 1a>> Each field of the "Extended TPMI" may reuse the existing "Precoding Information and Number of Layers" table for four antenna ports. For example, the first field of the "Extended TPMI" = 11 is "4 layers, TPMI = 0 (W4 ＴＸ,４,０ The second field of the "Extended TPMI" = 4 indicates "2 layers, TPMI = 0 (W ４ＴＸ,２,０ )) ４ＴＸ,ｉ,ｊ may mean the 4TX precoder of the TPMI table for i-layer transmission with TPMI index j.

[0163] <<Option 1b>> One field of the "extended TPMI" can indicate only "four-layer" entries. This allows the bit size of this field to be significantly reduced, and is equivalent to indicating one TPMI index from the four-layer TPMI table. Also, the other field of the "extended TPMI" can reuse the existing "precoding information and number of layers" table for four antenna ports. All W ４ＴＸ,４,ｊ Since only one precoder needs to be specified, overhead can be reduced.

[0164] <<Option 1c>> One field (the first field) of the "Extended TPMI" can reuse the existing "Precoding Information and Number of Layers" table for four antenna ports. The other field can interpret the "Precoding Information and Number of Layers" table based on the instruction of the first field. For example, if one "Extended TPMI" field = 9 and TPMI = 5 in layer 2, the other field can only be instructed from the entries for layer 1 and layer 2. W ４ＴＸ,ｉ,ｊ and W ４ＴＸ,ｍ,ｎ If there are any constraints and relationships between m and i, then m≦i.

[0165] Note that in each option, the scaling factor of the newly combined 8TX precoder may be recalculated.

[0166] <<Option 2>> The two fields of the "Extended TPMI" can reuse the existing TPMI index table for four antenna ports (Figs. 1 to 4). Layer information may be indicated separately, for example, by two fields of layer indication.

[0167] <<Option 2a>> As with option 1a, there is no restriction or relationship between the two fields of "Extended TPMI" and the two fields of "Layer Indication".

[0168] <<Option 2b>> Similar to option 1b, one field of “layer indication” indicates only four layers, and one field of “extended TPMI” indicates only four-layer precoder.

[0169] Option 2c: As with option 1c, one field of the "layer indication" is smaller than the other.

[0170] Fig. 17 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 TPMI. That is, Fig. 17 shows an example in which the table in Fig. 6 is reused for "extended TPMI".

[0171] If the second field of the "extended TPMI" is 4, two layers may be indicated for the second SRS resource set / UE coherent group, and precoder A in FIG. 17 may be indicated.

[0172] If the first field of the "extended TPMI" is 11, then four layers are indicated for the first SRS resource set / UE coherent group, and precoder B in FIG. 17 may be indicated.

[0173] Then, after decoding the above two fields, the UE may apply precoder C, which is a combination of precoders A and B. In this case, the scaling factor needs to be recalculated.

[0174] (Analysis) As described above, in the partially coherent precoder using the 8-port transmission codebook (8 TX UL codebook), the following are considered for the cases of Ng=2 and 4.

[0175] (When Ng=2) The precoding design may be based on the existing (e.g., Rel. 15) UL 4TX codebook. A fully coherent precoder / partially coherent precoder may be used.

[0176] (When Ng = 4) Precoder downselection (limiting the number of precoders) is considered. <Alt1> The precoding design may be based on an existing (e.g., Rel. 15) UL 2TX codebook. A fully coherent precoder may be used. <Alt2> The precoding design may be based on an existing (e.g., Rel. 15) UL 4TX codebook. A partially coherent precoder may be used.

[0177] 18A-18B show the N ｇ 18A and 18B are diagrams illustrating the association of ranks with layers for RBG=2. FIG. 18A corresponds to ranks 1 and 8, for example. FIG. 18B corresponds to ranks 2 to 7. Either case in FIG. 18 may be selected from the viewpoint of performance and DCI overhead.

[0178] Furthermore, regarding the reduction in the number of precoders described above, the analysis content for each rank can be organized as shown in FIG. 19. FIG. 19 is a diagram showing the association between the rank and the number of precoders. According to FIG. 19, it is possible to remove some layer splits for a certain rank (for example, the row "not support"). In this way, it is possible to further select precoders for the case of layer splitting and reduce the number of precoders.

[0179] As described above, in a partially coherent UE, there are settings with different numbers of antenna groups for the antenna layout (for example, two types, Ng = 2 and Ng = 4). In this case, it is assumed that the partially coherent precoder defined for Ng = 2 and the partially coherent precoder defined for Ng = 4 are different.

[0180] In such a case, it is not clear how to handle the setting of the partially coherent precoder for each Ng (number of antenna groups).Furthermore, sufficient consideration has not been given to the tables to be applied (e.g., the correspondence between the precoding matrix and the TPMI / the correspondence between the precoding information, the number of layers, and the TPMI).

[0181] Therefore, the inventors have conceived a method of DCI indication that indicates these correspondences (e.g., regarding layers and TPMIs for the 8 transmission UL parts).

[0182] 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.

[0183] (Various Alternative Readings, etc.) In the present disclosure, "A / B" and "at least one of A and B" may be interchangeable. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0184] 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.

[0185] 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.

[0186] 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.

[0187] 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.

[0188] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0189] 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.

[0190] 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.

[0191] In the present disclosure, TPMI and TPMI index may be interchangeable. Port and antenna port may be interchangeable. 8TX (8 transmissions) may mean 8 ports and 8 antenna ports. Port / antenna port may mean a port / antenna port for UL (e.g., SRS / PUSCH) transmission. In the present disclosure, SRS resource set and resource set may be interchangeable. Coherent group and SRS resource set may be interchangeable.

[0192] Although this disclosure mainly describes 8TX, the same applies to 5TX, 6TX, 7TX, 8 or more TX, 4 or less TX, etc. In the following embodiments, "8" may be read as "n (n is any integer)," and in this case, those skilled in the art will be able to appropriately read the number of layers / ports, etc., described assuming that the maximum value is "8," assuming that the maximum value is "n."

[0193] It should be noted that in this disclosure, "having the capability of..." may be read interchangeably as "supporting / reporting the capability of...".

[0194] In the present disclosure, the terms rank, transmission rank, number of layers, and number of antenna ports may be interchangeable. Furthermore, the terms "one codeword is applied" and "the number of layers is four or less" may be interchangeable. The terms "two codewords are applied" and "the number of layers is greater than four" may be interchangeable.

[0195] In the present disclosure, a table may be read interchangeably as one or more tables.

[0196] Furthermore, the DCI in the following embodiments may refer to a DCI that schedules at least one of a PUSCH and a PDSCH (for example, DCI format 0_x, 1_x (where x is an integer)). Furthermore, the following embodiments are based on the premise of codebook-based transmission (PUSCH), but are not limited thereto.

[0197] In the present disclosure, the application of one codeword and the number of layers being four or less may be interpreted as interchangeable. The application of two codewords and the number of layers being greater than four may be interpreted as interchangeable.

[0198] Furthermore, the following embodiment is based on the premise of codebook-based PUSCH transmission, but is not limited to this.

[0199] In this disclosure, an x-port precoder (where x is an integer) may refer to an x-port PC / FC / NC precoder. An x-port precoder may refer to an x-port i-layer PC / FC / NC precoder (or a rank i-x-port PC / FC / NC precoder).

[0200] In the present disclosure, the existing x-port precoder may be, for example, an x-port precoder defined in 3GPP Rel. 15 NR (for example, a precoder included in a UL 4-port transmission codebook).

[0201] In the present disclosure, field A / field B and first field / second field may be read interchangeably.

[0202] (Wireless Communication Method) First Embodiment The first embodiment relates to a precoder for 8TX UE when Ng=2.

[0203] In the first and second embodiments, the 8-port PC precoder may be configured using one existing 4-port precoder or two existing 4-port precoders. An 8-port PC precoder configured using one existing 4-port precoder may be called a Type 1 precoder. An 8-port PC precoder configured using two existing 4-port precoders may be called a Type 2 precoder.

[0204] The type 1 precoder P may be expressed by the following equation 1:

[0205] where A is an existing 4-port precoder, and O ４×ｒａｎｋ（Ａ）is a zero matrix with 4 rows and rank(A) columns, where rank(A) means the rank of matrix A (the same applies to subsequent similar rank(*)).

[0206] The type 2 precoder P may be expressed by the following equation 2:

[0207] Here, A １ and A ２ are existing four-port precoders (they may be the same or different precoders).

[0208] The type 1 precoder may be used when 1≦rank≦4. That is, the above rank(A) may be 1, 2, 3, or 4. For the type 1 precoder, the occupied antenna group may be {10} or {01}, where {first antenna group, second antenna group}. Here, the value '1' may mean occupied, and the value '0' may mean unoccupied. Note that the meanings indicated by these values ​​may be reversed.

[0209] A type 2 precoder may be used when 1<rank, i.e., rank(P)=rank(A １ ) + rank (A ２ ) = 2, 3, 4, 5, 6, 7 or 8. For a Type 2 precoder, the occupied antenna groups may be {11}.

[0210] For the type 2 precoder, (A １ Rank: A ２ The combinations of ranks (P) may be as follows: If rank(P)=2, then (1, 1); If rank(P)=3, then (1, 2), (2, 1); If rank(P)=4, then (1, 3), (2, 2), (3, 1); If rank(P)=5, then (1, 4), (2, 3), (3, 2), (4, 1); If rank(P)=6, then (2, 4), (3, 3), (4, 2); If rank(P)=7, then (3, 4), (4, 3); If rank(P)=8, then (4, 4).

[0211] 20A and 20B are diagrams illustrating the association between ranks and precoders according to the first embodiment.

[0212] As described above, the full coherent precoders for the Rel. 15 4 TX UL codebook corresponding to ranks 1 to 4 may be defined in one table. In the table, indices (TPMI indexes) of 0 to 29 may be indicated using, for example, a 5-bit field (see, for example, FIG. 20A). In this case, entries corresponding to indices 32 to 61 may be reused from an existing table.

[0213] Also, as shown in Figure 20A, one code point (for example, the index value may be 30) corresponding to rank = 0 (i.e., no precoder) may be introduced. That is, 30 (types) of precoders correspond to indices 0 to 29, and an additional index (30) may be introduced to indicate rank = 0.

[0214] The entries with rank=0 can support the layer split cases of (x,0) and (0,x), where layer=0 may mean that the corresponding antenna group is not used for transmission and only one antenna group is used.

[0215] For the codebook subset configuration of the partially coherent precoder with Ng=2, 5 bits are required per coherent group. For example, the first 5 bits (1 st 5 bits) may be used to indicate the layer and TPMI of the second coherent group (see FIG. 21 below). nd These first / second 5-bit fields may indicate the above-mentioned entries (e.g., FIG. 20A).

[0216] For example, if the first field indicates index=30 (layer=0) and the second field indicates index=28, the 8TX precoder may be expressed by Equation 3 below. Here, P ２８ may be a rank-4 4TX precoder denoted by index=28.

[0217] Also, if the first field indicates index=23 and the second field indicates index=30 (layer=0), the 8TX precoder may be expressed by the following Equation 4. Here, P ２３ may be a rank-2 4TX precoder denoted by index=23.

[0218] If a portion of the precoders is selected for each rank, the number of bits required to indicate the precoders for ranks 1 to 4 for one antenna group can be reduced. Figure 20B shows the reduced number of precoders. As shown in Figure 20B, an index (0 to 15) can be indicated for one coherent group using a 4-bit field.

[0219] Of the first and second five bits described above, one of the five bits (for example, st Rank=0 may be indicated only in the first and second 5-bit fields. That is, the UE may not expect rank=0 to be indicated in both of the two 5-bit fields (first and second 5-bit fields) at the same time.

[0220] Fig. 21 is a diagram showing an example of a DCI field (first / second fields) according to the first embodiment. In the above example, the case where the first / second fields are 5 bits has been described, but as shown in Fig. 21, the first / second fields may be represented by i bits (i may be any natural number). The first field may indicate a first antenna group. The second field may indicate a second antenna group. The first and second i may be the same or different. Furthermore, the order of the first / second fields may be reversed.

[0221] The combinations supported by the two 5-bit fields (first / second 5-bit) may be limited based on the constraints mentioned above.

[0222] In the present disclosure, whether to select a precoder (e.g., a full coherent precoder of Rel. 15) based on the above table may be specified in a specification or may be set / indicated by higher layer signaling / physical layer signaling. Also, the layer of the coherent group and the number of TPMI bits indicated in DCI format 0_1 / 0_2 may be specified in a specification or may be set / indicated by higher layer signaling / physical layer signaling.

[0223] In the case of a partially coherent precoder, a set of fields indicating layers and TPMI for Ng=2, 4 may be set.

[0224] Dynamic switching between partial coherence, full coherence, and non-coherence may or may not be assumed. Note that the number of required precoders (i.e., the size of the TPMI field) differs depending on the precoder to be applied. Therefore, when dynamic switching is assumed, the number of TPMI fields may be applied (determined) in the case where the field size is large.

[0225] The precoder switching may be related to the configuration for a limited codebook subset, e.g., when reusing an existing configuration, the entire codebook is applied as the existing configuration, which may include the full range of precoders for DCI indication.

[0226] When a new configuration is introduced and nested codebooks are not supported as an existing configuration, a specific coherence type (e.g., FC only, PC only with Ng=2, etc.) can be configured. In this case, the DCI size may be determined by the configured coherence type.

[0227] For existing codebook subsets, a unified DCI indication is needed for different types of precoders, so that different indications for each coherent type would prevent the UE from knowing the precoder type before decoding. In this case, only a unified RI / TPMI indication for the 8TX precoder may be used.

[0228] According to the first embodiment described above, it is possible to suitably instruct a precoder for an 8TX UE having two antenna groups.

[0229] Second Embodiment The second embodiment is a ｇ 22 and 23 are diagrams illustrating an example of association between rank and field A and field B according to the second embodiment.

[0230] A new field A is introduced, and N ｇ 18 ) supported in field A may be indicated. A new field B may be introduced to indicate a specific precoder based on the interpretation of field A. That is, the layer and TPMI indication in field B may be interpreted based on the layer split case indicated by field A. At least one of the following options may be applied to the interpretation of field B.

[0231] (Option 1) In each layer splitting case, if the number of 8TX precoders does not exceed a predetermined number (e.g., 32 or 16), field B (e.g., 5 bits for 32, 4 bits for 16) may be used to indicate new 8TX precoders for each layer splitting case. The predetermined number may be reported by the UE capability, defined in the specification, or configured / indicated by higher layer signaling / physical layer signaling.

[0232] Figure 22 shows an example in which field A is configured with 5 bits to indicate the status of 18. In Figure 22, interpretation of field B (4 bits) based on field A is shown for a specific rank (e.g., the case of layer division (1, 1) for rank 2). In the interpretation of field B, the number of supported 8TX precoders may be limited to a maximum of 16.

[0233] 23 shows an example in which field A is configured with 4 bits to indicate the status of 18. In FIG. 23, interpretation of field B (5 bits) based on field A is shown for a specific rank (e.g., the case of layer division (1, 1) for rank 2). In the interpretation of field B, the number of supported 8TX precoders may be limited to a maximum of 32.

[0234] In option 1, for each case of layer splitting, a new table with indexes starting from 0 may be defined in the specification.

[0235] (Option 2) Field B may indicate one or two fully coherent 4TX precoders of a certain rank based on the layer split indicated by field A. The UE may generate a new 8TX precoder based on the indicated one or two 4TX precoders by applying the formulas above.

[0236] For each rank from rank 1 to rank 4 of the 4TX codebook, the supported full coherent precoders may be numbered starting from 0 for indication in field B. This allows introducing a new TPMI table for the full coherent precoders selected / supported from the 4TX precoders for each rank.

[0237] For the indicated layer split case (x, y), x may indicate the rank of A1 and y may indicate the rank of A2. For example, if x=0, field B may indicate the TPMI index for rank y of A2. If y=0, field B may indicate the TPMI index of rank x of A1. If x!=0 and y!=0, field B may indicate the TPMI index of rank x of A1 and rank y of A2.

[0238] 24 is a diagram illustrating an example of DCI fields (fields A / B) according to the second embodiment. As shown in FIG. 24, field A may indicate a layer split case (x, y). The interpretation of field B may be based on the indication of field A (one or two TPMI indications corresponding to one or two non-zero layers).

[0239] Fig. 25 is a diagram illustrating an example of interpretation of field B according to the second embodiment. As illustrated in Fig. 25 , a specific precoder may be indicated by interpretation of field B for each rank / each layer division case / each field A.

[0240] As mentioned above, in the layer split case (0,X) (X is not zero), field B may indicate the TPMI index of rank X of the coherent group indicated by the layer split case indication (indication in field A). The layer split case (0,X) may mean that one of the layer numbers (rank numbers) is zero.

[0241] For example, for the layer split case (0,1) with rank=1 in the left table of Figure 25, field B may indicate an index from 0 to 15 corresponding to rank=1 from the right table of Figure 25. The 4TX precoder indicated by this index may be applied to the second antenna group.

[0242] Also, in the case of layer splitting with two different layers, such as in the case of (x, y) (x, y are not zero), field B may indicate a TPMI index corresponding to rank x and another TPMI index corresponding to rank y. The UE may generate a new 8TX precoder based on the 4TX precoder indicated by the interpretation of field B.

[0243] For example, in the case of rank=3 and layer splitting (2, 1) in the left table of Figure 25, field B may indicate some of the pre-defined precoders (e.g., four precoders indicated by two bits) as precoders for the first antenna group corresponding to rank 2. Field B may also indicate some of the precoders as precoders for the second antenna group corresponding to rank 1.

[0244] Also, in the case of layer division (x, y), if x=y, at least one of the interpretations shown in the following two options may apply:

[0245] <Option 2a> Field B may indicate one TPMI index of rank x. The UE may generate a new 8TX precoder corresponding to the two (both) antenna groups based on the 4TX precoder indicated by this TPMI index.

[0246] For example, in the left table of Figure 25, for rank=2 and layer split case (1,1) (option 2a), field B may indicate an index from 0 to 15 corresponding to rank=1 from the right table of Figure 25. The 4TX precoder indicated by this index may be applied to both the first and second antenna groups.

[0247] <Option 2b> Field B may indicate two TPMI indices of rank x. The UE may generate a new 8TX precoder corresponding to each antenna group based on the 4TX precoder indicated by each TPMI index.

[0248] For example, in the case of rank=2 and layer splitting (1,1) in the left table of Figure 25 (option 2b), field B may indicate some of the pre-defined precoders (e.g., four precoders indicated by two bits) as precoders for the first antenna group corresponding to rank 1. Field B may also indicate some of the precoders as precoders for the second antenna group corresponding to rank 1.

[0249] [Variation] As a special case, if only one precoder is predefined for a rank of a 4TX codebook (e.g., rank 4) to generate a new 8TX precoder, and if the layer splitting case includes 4 layers + x layers, then field B may not indicate the TPMI index of the antenna group with 4 layers (see Figure 26).

[0250] 26 is a diagram showing the association between the number of precoders and indexes for each rank according to a modification of the second embodiment. In FIG. 26, when all precoders are used, it may be specified for each rank that an index corresponding to one 4TX precoder is represented by a predetermined number of bits. Also, when only a portion of the precoders are used to generate a new 8TX precoder, it may be specified for each rank that a field with a smaller number of bits is used.

[0251] According to the second embodiment described above, a precoder for an 8TX UE having two antenna groups can be suitably instructed.

[0252] Third Embodiment The third embodiment is a ｇ In the third embodiment, the precoder is for an 8TX UE with N = 4. ｇ = 2 to N as appropriate ｇ = 4. In addition, in the third embodiment, the 4-port / 4TX in the first embodiment can be read as 2-port / 2TX.

[0253] In the third and fourth embodiments, an 8-port PC precoder may be configured using one to four existing 2-port precoders. An 8-port PC precoder configured using i (i = 1 to 4) existing 4-port precoders may be called a type i precoder.

[0254] The type 1 precoder P may be expressed by the following equation 5:

[0255] where A is an existing two-port precoder, and O ｋ×ｒａｎｋ（Ａ） is a zero matrix with k (for example, k=2, 4, 6) rows and rank(A) columns. Note that each of the type i precoders of the second embodiment has 8 rows and rank(A) columns (or 8 rows Σ ｉ rank (A ｉ ) columns), so the bottom right of the matrix is ​​"8 × rank (A) (or 8 rows Σ ｉ rank (A ｉ) column) is omitted. Also, as in Formula 5, P listed with a comma as a separator may mean that P is expressed by at least one of the listed formulas (the same applies to the subsequent formulas).

[0256] The type 2 precoder P may be expressed by the following equation 6:

[0257] Here, A １ and A ２ are existing four-port precoders (they may be the same or different precoders).

[0258] The type 3 precoder P may be expressed by the following equation 7:

[0259] Here, A １ , A ２ and A ３ are existing four-port precoders (they may be the same or different precoders).

[0260] The type 4 precoder P may be expressed by the following equation 8:

[0261] Here, A １ , A ２ , A ３ and A ４ are existing four-port precoders (they may be the same or different precoders).

[0262] A type 1 precoder may be used when 1≦rank≦2. That is, the above rank(A) may be 1 or 2. For a type 1 precoder, the occupied antenna groups may be {1000}, {0100}, {0010}, or {0001}, where {first antenna group, second antenna group, third antenna group, fourth antenna group} (corresponding to the Ps in order from the left in Equation 5, respectively). Here, a value '1' may mean occupied, and a value '0' may mean unoccupied. Note that the contents indicated by these values ​​may be reversed.

[0263] A type 2 precoder may be used when 2≦rank≦4, i.e., rank(P)=rank(A １ ) + rank (A ２ ) = 2, 3, or 4. For a Type 2 precoder, the occupied antenna groups may be {1100}, {1010}, {1001}, {0110}, {0101}, or {0011} (corresponding to P from left to right in Equation 6, respectively).

[0264] For the type 2 precoder, (A １ Rank: A ２ The combinations of rank(P) may be: (1, 1) if rank(P)=2, (2, 1), (1, 2) if rank(P)=3, (2, 2) if rank(P)=4.

[0265] A type 3 precoder may be used when 3≦rank≦6, i.e., rank(P)=rank(A １ ) + rank (A ２ ) = 3, 4, 5, or 6. For a Type 3 precoder, the occupied antenna groups may be {1110}, {1101}, {1011}, or {0111} (corresponding to the Ps from left to right in Equation 7, respectively).

[0266] For the type 3 precoder, (A １ Rank: A ２ Rank: A ３ The combinations of ranks (P) may be: (1, 1, 1) if rank(P)=3; (2, 1, 1), (1, 2, 1), (1, 1, 2) if rank(P)=4; (2, 2, 1), (2, 1, 2), (1, 2, 2) if rank(P)=5; (2, 2, 1), (2, 1, 2), (1, 2, 2) if rank(P)=6; (2, 2, 2).

[0267] A type 4 precoder may be used when 4≦rank≦8, i.e., rank(P)=rank(A １ ) + rank (A ２) may be 4, 5, 6, 7, or 8. For a Type 3 precoder, the occupied antenna group may be {1111} (corresponding to P in Equation 8).

[0268] For the type 4 precoder, (A １ Rank: A ２ Rank: A ３ Rank: A ４ The combinations of ranks (P) may be as follows: If rank(P)=4, (1, 1, 1, 1), If rank(P)=5, (2, 1, 1, 1), (1, 2, 1, 1), (1, 1, 2, 1), (1, 1, 1, 2), If rank(P)=6, (2, 2, 1, 1), (2, 1, 2, 1), (2, 1, 1, 2), (1, 2, 2, 1), (1, 1, 2, 2), (1, 2, 1, 2), If rank(P)=7, (2, 2, 2, 1), (2, 2, 1, 2), (2, 1, 2, 2), (1, 2, 2, 2), If rank(P)=8, (2, 2, 2, 2).

[0269] 27A and 27B are diagrams illustrating an association between the rank and the number of precoders according to the third embodiment. Fig. 28 is a diagram illustrating an example of a correspondence relationship between the field values ​​of the precoding information and the number of layers, and the number of layers and TPMI according to the third embodiment.

[0270] As described above, the full coherent precoders for the Rel. 15 2 TX UL codebook corresponding to ranks 1 to 4 may be defined in one table. In the table, indices 0 to 5 (TPMI indexes) may be indicated using, for example, a 3-bit field (see FIG. 27A). In this case, entries corresponding to indices 3 to 8 may be reused from an existing table (see, for example, FIG. 28).

[0271] Also, as shown in Figure 27A, one code point (e.g., the index value may be 6) corresponding to rank = 0 (i.e., no precoder) may be introduced. That is, six (types) of precoders correspond to indices 0 to 5, and an additional index (6) may be introduced to indicate rank = 0.

[0272] Note that the table shown in Figure 27A may be the same as the table in Figure 28 by reusing the entries corresponding to indexes 3 to 8 and adding an entry corresponding to rank = 0. In this case, indexes 3 to 8 may be shifted to 0 to 5. Here, the entries corresponding to indexes 3 to 8 in Figure 28 may correspond to the layers and TPMI of a 2TX full coherent precoder. Also, 3 bits may be used to indicate indexes 0 to 6.

[0273] For the codebook subset configuration of the partially coherent precoder with Ng=4, three bits are required per coherent group. For example, the first three bits (1 st 3 bits) may be used to indicate the layer and TPMI of the second coherent group (see FIG. 29 below). nd The third 3 bits (3 rd The fourth 3 bits (4 th These first to fourth 3-bit fields may indicate the above-mentioned entries (for example, FIG. 27A).

[0274] If a portion of the precoders is selected for each rank, the number of bits required to indicate the precoders for ranks 1 to 4 for one antenna group can be reduced. Figure 27B shows the reduced number of precoders. As shown in Figure 20B, an index (0 to 3) can be indicated for one coherent group using a 2-bit field.

[0275] Also, a maximum of 3 bits is sufficient to indicate rank=0.

[0276] FIG. 29 is a diagram showing an example of a DCI field (first to fourth fields) according to the third embodiment. In the above example, the first to fourth fields are 3 bits long, but as shown in FIG. 29, the first to fourth fields may be represented by i bits (i may be any natural number). The first to fourth fields may indicate first to fourth antenna groups, respectively. In the first to fourth fields, i may be the same or different. Furthermore, the order of the first to fourth fields may be reversed.

[0277] The combinations supported by the four 3-bit fields (first to fourth 3-bits) may be limited based on the constraints described above.

[0278] According to the third embodiment described above, a precoder for an 8TX UE having four antenna groups can be suitably instructed.

[0279] <Fourth embodiment> The fourth embodiment is a ｇ The fourth embodiment relates to new DCI fields (fields A / B) for precoders for 8TX UEs at N = 4. ｇ = 2 to N as appropriate ｇ = 4. In addition, in the fourth embodiment, the 4-port / 4TX in the second embodiment can be replaced with 2-port / 2TX.

[0280] FIG. 30 shows N ｇ30 is a diagram showing the association between ranks and layers when .DELTA.=4. For example, it corresponds to ranks 1 to 8. From the viewpoint of performance and DCI overhead, any of the cases in FIG. 30 may be selected.

[0281] A new field A (see Figures 31 and 32 below) is introduced, and N ｇ 30 ) supported by field A = 4 may be indicated. According to FIG. 30 , a total of 80 cases may be indicated depending on the combination of cases for one layer analysis. Also, a new field B (see FIGS. 31 and 32 described below) may be introduced to indicate a specific precoder based on the interpretation of field A. That is, the layer and TPMI indications in field B may be interpreted based on the layer split case indicated by field A.

[0282] Note that some (combinations of) the layer division cases shown in FIG. 30 may be deleted to reduce the number of bits in field A.

[0283] The interpretation of field B can be based on at least one of the following options:

[0284] (Option 1) In each layer splitting case, if the number of 8TX precoders does not exceed a predetermined number (e.g., 16 or 8), field B (e.g., 4 bits for 16, 3 bits for 8) may be used to indicate new 8TX precoders for each layer splitting case. The predetermined number may be reported by UE capability, specified in a specification, or configured / indicated by higher layer signaling / physical layer signaling.

[0285] In option 1, for each case of layer splitting, a new table with indexes starting from 0 may be defined in the specification.

[0286] (Option 2) Field B may indicate one to four fully coherent 2TX precoders corresponding to a certain rank based on the layer split indicated by field A. The UE may generate a new 8TX precoder based on the indicated one to four 2TX precoders by applying the above equations (e.g., Equation 8).

[0287] 31 is a diagram illustrating an example of a DCI field (field A / B) according to the fourth embodiment. As illustrated in FIG. 31, field A may indicate a layer split case (a, b, c, d). Interpretation of field B may be based on the indication of field A (one to four TPMI indications corresponding to one to four non-zero layers).

[0288] Fig. 32 is a diagram illustrating an example of interpretation of field B according to the fourth embodiment. As illustrated in Fig. 32 , a specific precoder may be indicated by interpretation of field B for each rank / each layer division case / each field A.

[0289] As shown in Figure 32, for example, for rank = 1 in the left table, field B may indicate an index from 0 to 3 corresponding to rank = 1 from the right table. The 2TX precoder indicated by this index may be applied to the indicated antenna group.

[0290] Also, in the case of layer division (a, b, c, d), if at least two of a to d have the same value, at least one of the interpretations shown in the following two options may be applied.

[0291] <Option a> Field B may indicate one TPMI index of rank a to d. The UE may generate a new 8TX precoder corresponding to the two (both) antenna groups based on the 2TX precoder indicated by this TPMI index.

[0292] For example, in the case of layer splitting (1,1,0,0) with rank=2 in the left table of Figure 32 (option a), field B may indicate an index from 0 to 3 corresponding to rank=1 from the right table of Figure 32. The 2TX precoder indicated by this index may be applied to both of the two indicated antenna groups.

[0293] <Option b> Field B may indicate two TPMI indices of ranks a to d. The UE may generate a new 8TX precoder corresponding to each antenna group based on the 2TX precoder indicated by each TPMI index.

[0294] For example, in the case of rank=2 and layer splitting (1,1,0,0) in the left table of Figure 32 (option b), field B may indicate indices 0 to 3 corresponding to rank=1 from the right table of Figure 32 as precoders for the first antenna group corresponding to rank 1. Field B may also indicate indices 0 to 3 corresponding to rank=1 from the right table of Figure 32 as precoders for the second antenna group corresponding to rank 1.

[0295] Also, in layer split cases where m coherent groups (i.e., m is not zero) are indicated, as shown for rank 4 and above in Figure 32, at least one of the interpretations shown in the following two options may be applied.

[0296] <Option a> Field B may indicate m TPMI indexes of the corresponding rank, each of which may be applied to a corresponding antenna group.

[0297] <Option b> When the same layer division case exists for two to four antenna groups, field B may indicate one TPMI index for the same layer. The one TPMI index may be applied to the corresponding antenna groups. For different layers, field B may indicate different TPMI indexes for the corresponding antenna groups.

[0298] [Variation] As a special case, if only one precoder is predefined for a rank of a 2TX codebook (e.g., rank 2) to generate a new 8TX precoder, and the layer split case includes two layers out of (a, b, c, d), then field B may not indicate the TPMI index of the antenna group with two layers (see Figure 33).

[0299] 33 is a diagram illustrating the association between the number of precoders for each rank and an index according to a modification of the fourth embodiment. In FIG. 33, it may be specified for each rank that a field with a smaller number of bits is used when only a part of the precoder is used to generate a new 8TX precoder.

[0300] According to the fourth embodiment described above, a precoder for an 8TX UE having four antenna groups can be suitably instructed.

[0301] <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.

[0302] 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.

[0303] 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.

[0304] Furthermore, notification of any information to the UE in the above embodiments may be performed periodically, semi-persistently, or aperiodically.

[0305] [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.

[0306] 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.

[0307] If the notification is made by UCI, the notification may be transmitted using PUCCH or PUSCH.

[0308] Furthermore, any information in the above-described embodiments may be notified from the UE periodically, semi-persistently, or aperiodically.

[0309] [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.

[0310] At least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.

[0311] The specific UE capabilities may indicate at least one of the following: - Supporting specific processing / operation / control / information for at least one of the above embodiments; - Supporting 8TX UL transmission; - Supporting multiple different antenna layouts / number of antenna groups; - Supported precoder types (e.g., Type 1 / 2, Type A / B / C / D); - Existing x-port PC / FC / NC precoders that can be used (supported) to configure an 8-port PC precoder; - Supporting precoder restrictions.

[0312] 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).

[0313] 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)).

[0314] 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 embodiments (or performing the operations of the above-described embodiments) by higher layer signaling / physical layer signaling, for example, the specific information may be information indicating support for 8TX UL transmission, information indicating enabling support for multiple different antenna layouts / number of antenna groups, any RRC parameters for a specific release (e.g., Rel. 18 / 19), etc.

[0315] 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.

[0316] (Supplementary Notes) The following inventions are supplementary notes regarding an embodiment (first / second embodiment) of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiver that receives downlink control information including information on a codebook subset that indicates a 4-port precoder for each layer; and a controller that determines an 8-port partially coherent precoder for uplink transmission based on the 4-port precoder indicated by the information, wherein the downlink control information includes a field corresponding to rank 0. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the downlink control information includes a field indicating an indication for each antenna group. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the downlink control information includes field A indicating a layer split case and field B indicating a specific 4-port precoder based on interpretation of field A. [Supplementary Note 4] The terminal according to any one of Supplementary Notes 1 to 3, wherein the number of the 4-port precoders is limited for each of the number of antenna groups.

[0317] (Supplementary Notes) The following inventions are supplementary notes regarding an embodiment (third / fourth embodiment) of the present disclosure. [Supplementary Note 1] A terminal comprising: a receiver that receives downlink control information including information on a codebook subset that indicates a two-port precoder for each layer; and a controller that determines an eight-port partially coherent precoder for uplink transmission based on the two-port precoder indicated by the information, wherein the downlink control information includes a field corresponding to rank 0. [Supplementary Note 2] The terminal according to Supplementary Note 1, wherein the downlink control information includes a field indicating an indication for each antenna group. [Supplementary Note 3] The terminal according to Supplementary Note 1 or Supplementary Note 2, wherein the downlink control information includes field A indicating a layer split case and field B indicating a specific two-port precoder based on interpretation of field A. [Supplementary Note 4] The terminal according to any one of Supplementary Notes 1 to 3, wherein the number of two-port precoders is limited for each number of antenna groups.

[0318] (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.

[0319] 34 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).

[0320] 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.

[0321] 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.

[0322] 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))).

[0323] 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.

[0324] 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).

[0325] 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.

[0326] 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.

[0327] 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.

[0328] 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.

[0329] 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.

[0330] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0331] 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).

[0332] 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.

[0333] 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.

[0334] 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.

[0335] 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).

[0336] 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.

[0337] 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.

[0338] 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.

[0339] 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.

[0340] 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.

[0341] 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.

[0342] 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.

[0343] 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.

[0344] 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).

[0345] (Base Station) Fig. 35 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.

[0346] 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.

[0347] 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.

[0348] 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.

[0349] 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.

[0350] 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.

[0351] 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.

[0352] 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.

[0353] 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.

[0354] 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.

[0355] 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.

[0356] 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.

[0357] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0358] 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.

[0359] 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.

[0360] 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.

[0361] 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.

[0362] The transceiver 120 may transmit downlink control information including information on a codebook subset indicating a 4-port / 2-port precoder for each layer. The transceiver 120 may receive uplink transmissions to which an 8-port partially coherent precoder is applied, the 8-port partially coherent precoder being determined based on the 4-port / 2-port precoder indicated by the information.

[0363] The control unit 110 may control reception of the physical uplink shared channel.

[0364] (User terminal) Fig. 36 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.

[0365] 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.

[0366] 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.

[0367] 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.

[0368] 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.

[0369] 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.

[0370] 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.

[0371] 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.

[0372] 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.

[0373] 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.

[0374] 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.

[0375] 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.

[0376] 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.

[0377] 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.

[0378] 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.

[0379] 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.

[0380] The measurement unit 223 may derive channel measurements for CSI calculation based on the channel measurement resources. The channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources. The measurement unit 223 may also derive interference measurements for CSI calculation based on the interference measurement resources. The interference measurement resources may be at least one of an NZP CSI-RS resource for interference measurement, a CSI-Interference Measurement (IM) resource, etc. Note that CSI-IM may be referred to as CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS. Note that in the present disclosure, CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be interchangeably read as interchangeable.

[0381] 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.

[0382] In addition, the transceiver unit 220 may receive downlink control information including information on a codebook subset indicating a 4-port / 2-port precoder for each layer. The downlink control information may include a field corresponding to rank 0. The downlink control information may include a field indicating an instruction for each antenna group. The downlink control information may include field A indicating a layer split case and field B indicating a specific 4-port precoder based on interpretation of field A. The number of the 4-port / 2-port precoders may be limited for each number of antenna groups.

[0383] The control unit 210 may determine an 8-port partially coherent precoder for uplink transmission based on the 4-port / 2-port precoder indicated by the information.

[0384] (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.

[0385] 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.

[0386] 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 37 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.

[0387] 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.

[0388] 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.

[0389] 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.

[0390] 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.

[0391] 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.

[0392] 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.

[0393] 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.

[0394] 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.

[0395] 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).

[0396] 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.

[0397] 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.

[0398] (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.

[0399] 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.

[0400] 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.

[0401] 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.

[0402] 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.

[0403] 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.

[0404] 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.

[0405] 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.

[0406] 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.

[0407] 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.

[0408] 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.

[0409] 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.

[0410] 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.

[0411] 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.

[0412] 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.

[0413] 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.

[0414] 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.

[0415] 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.

[0416] 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."

[0417] 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.

[0418] 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.

[0419] 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.

[0420] 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.

[0421] 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.

[0422] 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.

[0423] 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.

[0424] 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).

[0425] 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).

[0426] 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).

[0427] 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.

[0428] 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.

[0429] 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).

[0430] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "layer," "number of layers," "rank," "resource," "resource set," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," "UE panel," "transmitting entity," "receiving entity," etc. may be used interchangeably.

[0431] In the present disclosure, the term "antenna port" may be interchangeably read as an antenna port for any signal / channel (e.g., a demodulation reference signal (DMRS) port). In the present disclosure, the term "resource" may be interchangeably read as a resource for any signal / channel (e.g., a reference signal resource, an SRS resource, etc.). The resource may include time / frequency / code / space / power resources. Furthermore, the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.

[0432] The group may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, and the like.

[0433] In addition, in the present disclosure, beam, SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable terms.

[0434] In addition, in the present disclosure, the terms TCI state, downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, joint TCI state, etc. may be read interchangeably.

[0435] Furthermore, in the present disclosure, terms such as "QCL," "QCL assumption," "QCL relationship," "QCL type information," "QCL property / properties," "specific QCL type (e.g., Type A, Type D) property," and "specific QCL type (e.g., Type A, Type D)" may be interchangeable.

[0436] In the present disclosure, terms such as index, identifier (ID), indicator, indication, and resource ID may be interchangeable. In the present disclosure, terms such as sequence, list, set, group, cluster, and subset may be interchangeable.

[0437] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information (TCI state)" may be interchangeable with "set of spatial relationship information (TCI state)", "one or more pieces of spatial relationship information", etc. The TCI state and the TCI may be interchangeable. The spatial relationship information and the spatial relationship may be interchangeable.

[0438] 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.

[0439] 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.

[0440] 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.

[0441] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0442] 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.

[0443] 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.

[0444] 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.

[0445] 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.

[0446] 38 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.

[0447] 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.

[0448] 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).

[0449] 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.

[0450] 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.

[0451] 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.

[0452] 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.

[0453] 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.

[0454] 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).

[0455] 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.

[0456] 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)).

[0457] 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.

[0458] 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.

[0459] 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.

[0460] 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.

[0461] 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.

[0462] 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).

[0463] 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."

[0464] 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.

[0465] 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.

[0466] 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.

[0467] Furthermore, "determination" may be considered to be "determining" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "determining" some kind of action. In the present disclosure, "determination" may be read interchangeably with the above-mentioned actions.

[0468] Furthermore, in this disclosure, "determine / determining" may be interchangeably read as "assume / assuming," "expect / expecting," "consider / considering," etc. Furthermore, in this disclosure, "does not expect to do..." may be interchangeably read as "assumes not to do...."

[0469] In the present disclosure, "expect" may be interchangeably read as "be expected." For example, "expect(s) ..." ("..." may be expressed, for example, as a that clause, a to-infinitive, etc.) may be interchangeably read as "be expected ...." "does not expect ..." may be interchangeably read as "be not expected ...." Furthermore, "An apparatus A is not expected ..." may be interchangeably read as "an apparatus B other than apparatus A does not expect ... from apparatus A" (e.g., if apparatus A is a UE, apparatus B may be a base station).

[0470] 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.

[0471] 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."

[0472] 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.

[0473] 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."

[0474] 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.

[0475] 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.

[0476] 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").

[0477] In this disclosure, the terms "of," "for," "regarding," "related to," "associated with," etc. may be read interchangeably.

[0478] In the present disclosure, terms such as "when A, B," "if A, (then) B," "B upon A," "B in response to A," "B based on A," "B during / while A," "B before A," "B at (the same time as) / on A," "B after A," "B since A," and "B until A" may be interchangeable. Note that A, B, and the like herein may be replaced with appropriate expressions such as nouns, gerunds, and regular sentences, depending on the context. Note that the time difference between A and B may be approximately zero (immediately after or immediately before). A time offset may also be applied to the time at which A occurs. For example, "A" may be interchangeable with "before / after a time offset at which A occurs." The time offset (eg, one or more symbols / slots) may be predefined or may be specified by the UE based on signaled information.

[0479] In the present disclosure, timing, time, duration, time instance, any time unit (e.g., slot, subslot, symbol, subframe), period, occasion, resource, etc. may be read interchangeably.

[0480] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The description of the present disclosure is for illustrative purposes only and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A receiving unit that receives downlink control information (DCI) including a precoding information field for uplink (UL) transmission using more than four antenna ports, The system includes a control unit that determines an 8-port partial coherent precoder for UL transmission based on the precoding information field, In a terminal where the number of antenna groups (Ng) = 4, the 8-port partial coherent precoder is composed of one or more 2-port full coherent precoders.

2. The terminal according to claim 1, wherein the 8-port partial coherent precoder in the antenna group number (Ng) = 2 is composed of one or more 4-port full coherent precoders.

3. The steps of receiving downlink control information (DCI) including a precoding information field for uplink (UL) transmission using more than four antenna ports, The step of determining an 8-port partial coherent precoder for UL transmission based on the precoding information field, A wireless communication method for a terminal, wherein the 8-port partial coherent precoder in a configuration with an antenna group number (Ng) = 4 is composed of one or more 2-port full coherent precoders.

4. A transmitting unit that transmits downlink control information (DCI) including a precoding information field for uplink (UL) transmission using more than 4 antenna ports, It has a receiving unit that receives UL transmissions to which an 8-port partial coherent precoder determined based on a precoding information field is applied, A base station in which the 8-port partial coherent precoder in an antenna group number (Ng) = 4 is composed of one or more 2-port full coherent precoders.

5. A system comprising a terminal and a base station, The aforementioned terminal is A receiving unit that receives downlink control information (DCI) including a precoding information field for uplink (UL) transmission using more than 4 antenna ports, The system includes a control unit that determines an 8-port partial coherent precoder for UL transmission based on the precoding information field, In a configuration with 4 antenna groups (Ng), the 8-port partial coherent precoder is composed of one or more 2-port full coherent precoders. The base station is a system having a transmitting unit that transmits the DCI.