Terminal, wireless communication method, base station and system

Abstract

A terminal according to one aspect of the present disclosure has: a reception unit for receiving information concerning a precoder type indicating a code book subset, and downlink control information including precoding information and a field that specifies the number of layers; and a control unit for determining a transmission precoding matrix indicator and the number of layers to be applied to UL transmission on the basis of the information concerning a precoder type and the field of the downlink control information. In the case where more than four antenna ports are supported in the UL transmission, the correspondence relationship between the code point of the field, and the transmission precoding matrix indicator and the number of layers is defined in common among a plurality of code book subsets.

Description

Terminal, wireless communication method and base station

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

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

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

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

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

[0006] However, there has been little progress in studying how to control UL transmission (for example, how to determine a precoding matrix, etc.) when using more than four antenna ports. Unless this is clarified, there is a risk that an increase in communication throughput will be inhibited.

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

[0008] A terminal according to one aspect of the present disclosure includes a receiving unit that receives information related to a precoder type indicating a codebook subset and downlink control information including a field indicating precoding information and a number of layers, and a control unit that determines a transmit precoding matrix index and a number of layers to be applied to UL transmission based on the information related to the precoder type and the field of the downlink control information, and when supporting more than four antenna ports in UL transmission, the correspondence between the code point of the field and the transmit precoding matrix index and the number of layers is commonly defined among multiple codebook subsets.

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

[0010] Figure 1 is a diagram showing an example of a table of precoding matrices W for single-layer (rank 1) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 2 is a diagram showing an example of a table of precoding matrices W for two-layer (rank 2) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 3 is a diagram showing an example of a table of precoding matrices W for three-layer (rank 3) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 4 is a diagram showing an example of a table of precoding matrices W for four-layer (rank 4) transmission using four antenna ports when the transform precoder is disabled in Rel. 16 NR. Figure 5 is a diagram showing an example of the correspondence between field values ​​for precoding information and number of layers and the number of layers and TPMI in Rel. 16 NR. Figures 6A and 6B are diagrams showing an example of an antenna layout for eight antenna ports. FIG. 7 is a diagram illustrating an example of a table used to determine the number of layers / TPMI index when supporting more than four antenna ports. FIGS. 8A and 8B are diagrams illustrating an example of a field configuration included in DCI when supporting more than four antenna ports. FIG. 9 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 10 is a diagram illustrating an example of a configuration of a base station according to an embodiment. FIG. 11 is a diagram illustrating an example of a configuration of a user terminal according to an embodiment. FIG. 12 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to an embodiment. FIG. 13 is a diagram illustrating an example of a vehicle according to an embodiment.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0044] Figures 1-4 are diagrams showing examples of associations between codebook subsets and TPMI indexes. 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 index from left to right (similarly shown in Figures 2-4).

[0045] The correspondence (which may be called a table) showing the TPMI index and the corresponding W as shown in Figures 1-4 is also called a codebook. A part of this codebook is also called a codebook subset.

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

[0047] 2-4 correspond to tables of precoding matrices W for 2-4 layer (rank 2-4) transmission using 4 antenna ports in Rel. 16 NR when transform precoding is disabled.

[0048] According to Figure 2, the TPMIs that the UE is informed of for two-layer transmission are 0 to 21 (codebook subsets full, partial and non-coherent), 0 to 13 (precoder type partial and non-coherent) or 0 to 5 (precoder type non-coherent).

[0049] According to Figure 3, the TPMI that the UE is informed of for three-layer transmission is 0 to 6 (codebook subset full, partial and non-coherent), 0 to 2 (precoder type partial and non-coherent) or 0 (precoder type non-coherent).

[0050] According to Figure 4, the TPMI that the UE is informed of for 4-layer transmission is 0 to 4 (codebook subset full, partial and non-coherent), 0 to 2 (precoder type partial and non-coherent) or 0 (precoder type non-coherent).

[0051] 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.

[0052] The non-coherent codebook and the partially coherent codebook may be called an antenna selection precoder, an antenna port selection precoder, etc. For example, the non-coherent codebook (non-coherent precoder) may be called a one-port selection precoder, a one-port port selection precoder, etc. Furthermore, the partially coherent codebook (partially coherent precoder) may be called an x-port (x is an integer greater than 1) selection precoder, an x-port port selection precoder, etc. The fully coherent codebook may be called a non-antenna selection precoder, an all-port precoder, etc.

[0053] 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).

[0054] 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).

[0055] (Size of Precoding Information Field) As described above, the UE may determine the TPMI and number of layers (transmission rank) for a PUSCH based on the precoding information field of the DCI (e.g., DCI format 0_1 / 0_2) that schedules the PUSCH.

[0056] 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.

[0057] 5 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 illustrated "bit field mapped to index" indicates the field values ​​(or field index / code point) of the precoding information and the number of layers.

[0058] In FIG. 5, 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.

[0059] As shown in Figure 5, 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 5, 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 5, 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.

[0060] 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.

[0061] (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.

[0062] 6A and 6B are diagrams showing examples of antenna layouts with eight antenna ports. Fig. 6A shows an example in which eight antennas are arranged one-dimensionally (1D), and Fig. 6B shows an example in which eight antennas are arranged two-dimensionally (2D). Fig. 6A corresponds to an antenna configuration having four cross-polarized antennas arranged in the horizontal direction. Fig. 6B corresponds to an antenna configuration having two cross-polarized antennas arranged in both the horizontal and vertical directions.

[0063] It should be noted that the antenna layout is not limited to these examples, and may differ from the examples shown in Figures 6A and 6B in terms of, 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 particular direction (horizontal, vertical, etc.), and the polarization antenna configuration (single polarization, cross polarization, number of polarization planes, etc.).

[0064] 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.

[0065] 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.

[0066] However, for UL transmission using more than four antenna ports, how to determine UL transmission (e.g., precoding matrix / TPMI index / number of layers, etc.) has not been studied. For example, how to set / signal the TPMI index / number of layers corresponding to each codebook subset for 1-8 layer transmission using 8 antenna ports has not been studied. Unless this is clarified, there is a risk that an increase in communication throughput will be inhibited.

[0067] Therefore, the present inventors have conceived a method for appropriately performing UL transmission using more than four antenna ports.

[0068] 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.

[0069] In the present disclosure, "A / B" and "at least one of A and B" may be interpreted interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C."

[0070] In the present disclosure, terms such as 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.

[0071] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher layer parameters, information elements (IEs), configuration, etc. may be interchangeable. In the present disclosure, Medium Access Control control elements (MAC Control Elements (CEs)), update commands, activation / deactivation commands, etc. may be interchangeable. Note that configuration may be performed (or notified) based on RRC signaling, and activation / deactivation may be performed (or notified) based on MAC CE.

[0072] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, or a combination thereof.

[0073] 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.

[0074] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), and the like.

[0075] 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.

[0076] In this 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 (CONTROLLER RESEARCH SYSTEM), Physical Downlink Shared Channel (PDSCH), Codeword (CW), Transport Block (TB), Reference Signal (RS), Antenna, Layer, Transmission, Port, 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, CONTROLLER RESEARCH SYSTEM), 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.

[0077] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information" may be interchangeable with "set of spatial relationship information," "one or more pieces of spatial relationship information," etc. The TCI state and the TCI may be interchangeable with each other.

[0078] Furthermore, PUSCH transmission in the following embodiments may or may not be based on the premise that multiple panels are used (it may be applied regardless of the panels).

[0079] The number "8" in the following embodiments may be interpreted as any number greater than 4 (for example, 6, 10, 12, 16, . . . ).

[0080] (Wireless communication method) A UE may receive downlink control information (DCI) including information on a precoder type indicating a codebook subset and a predetermined field indicating precoding information and the number of layers. A specific codebook subset may be set from multiple codebook subsets (e.g., ) based on the information on the precoder type. The information on the precoder type may be set / notified to the UE from the base station using an upper layer parameter (e.g., codebookSubset).

[0081] The UE may determine the precoding matrix index (or TPMI index) and the number of layers to be applied to UL transmission based on information regarding the precoder type received from the base station and a predetermined field included in the DCI, and may determine the precoding matrix (W) to be applied to UL transmission.

[0082] For multiple codebook subsets, an association (table) between a code point (or field index) of a predetermined field of DCI and a TPMI index / number of layers may be predefined. The precoding matrix (W) may be determined for each layer based on the association (or table) between the TPMI index and the precoding matrix.

[0083] If more than four antenna ports (or layers) are supported in UL transmission, the UE may apply a table corresponding to more than four antenna ports (e.g., an association between code points of certain fields of DCI and TPMI index / layer number).

[0084] Furthermore, when more than four antenna ports (or layers) are supported in UL transmission, an association between a TPMI index and a precoding matrix (W) (e.g., a precoding matrix table) may be defined for each layer. In this case, the association between a TPMI index and a precoding matrix (W) (e.g., Figures 1 to 4) of an existing system (e.g., Rel. 16 or earlier) may be applied up to four antenna ports. Furthermore, for each layer of more than four antenna ports (e.g., eight antenna ports), an association between a TPMI index and a precoding matrix (W) may be newly defined / configured.

[0085] 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.

[0086] 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.

[0087] 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 this case, the TPMI index corresponding to partial coherence is X ＮＣ，ｉ ~ (X ＮＣ，ｉ +X ＰＣ，ｉ -1).

[0088] 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).

[0089] <First embodiment> In the first embodiment, when more than four antenna ports / layers are supported in UL transmission, association of code points of predetermined fields of DCI with layer numbers / TPMI indexes for multiple codebook subsets (e.g., precoding information and layer number tables) will be described.

[0090] In the present disclosure, eight antenna ports / eight layers are used as an example of antenna ports / layers greater than four, but the applicable number of antenna ports / layers is not limited to this. Also, in the present disclosure, a field indicating precoding information and the number of layers (e.g., precoding information and number of layers) is used as an example of a predetermined field of DCI, but the present disclosure is not limited to this.

[0091] Furthermore, in the present disclosure, the association between the code point of a predetermined field of DCI (or a bit field mapped to an index (e.g., a bit field mapped to an index)) and the number of layers / TPMI index may be interpreted as a table. Furthermore, in the present disclosure, an example is given in which multiple codebook subsets (or multiple precoder types) include fully and partial and non-coherent (fullyAndPartialAndNonCoherent), partial and non-coherent (partialAndNonCoherent), non-coherent, and all (or at least two) of them, but this is not limiting.

[0092] When eight antenna ports / layers are supported in the UL, the correspondence between at least some code points (or bit fields / field indices mapped to indices) of a predetermined field of DCI and the number of layers / TPMI index may be set in common among a plurality of codebook subsets. That is, the same number of layers / TPMI index may correspond to at least some code points of a predetermined field of DCI among a plurality of codebook subsets.

[0093] FIG. 7 is a diagram showing an example of the association (or table) between the code points of predetermined fields of DCI (for example, the precoding information and layer number fields) and the layer number / TPMI index.

[0094] 7 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. 7 may be applied when full power transmission (e.g., ul-FullPowerTransmission) is not set, full power mode 2 (e.g., fullpowerMode2) is set, or full power (e.g., fullpower) is set.

[0095] 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).

[0096] 7 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).

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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 a smaller number. In this case, the number of TPMI indices supported may be the same for some numbers of layers.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] The table shown in Figure 7 may be applied in certain 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 7 may be applied. Otherwise, a table for two / four antenna ports (e.g., a table defined in Rel. 16 or earlier) may be applied.

[0105] 7 shows 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).

[0106] 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).

[0107] 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).

[0108] 7 shows a table for eight antenna ports with a maximum rank of 2, 3, 4, 5, 6, 7, or 8, but is not limited to this. A table for eight antenna ports with a maximum rank smaller 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.

[0109] Second Embodiment In a second embodiment, predetermined fields of DCI (for example, precoding information and layer number fields) will be described when more than four antenna ports / layers are supported in UL transmission.

[0110] When more than four antenna ports / layers are supported in UL transmission, a field in the DCI may be used to dynamically indicate to the UE the table to be used to determine the number of layers / TPMI index. For example, when 8 antenna ports / Tx / layers for UL transmission (e.g., PUSCH / SRS) are configured by the RRC / MAC CE / DCI, the DCI may dynamically indicate whether to use a table for more than four antenna ports (e.g., a table for 8 Tx) or a table for four or fewer antenna ports (e.g., a table for 2 Tx / 4 Tx).

[0111] A UE capability may be introduced / defined as to whether to support dynamic indication of 8Tx or 2Tx / 4Tx.

[0112] A configuration may be adopted in which a table to be used for determining the number of layers / TPMI index is indicated (or table switching) using a new field or an existing field of DCI. For example, a new field (e.g., 1 bit) of DCI may be used to indicate either a table for 8Tx or a table for 2Tx / 4Tx. Note that instead of providing a new field in DCI, the indication may be made using 1 bit of an existing field.

[0113] If 8Tx (e.g., a table for 8Tx) is indicated by the DCI, the table for 8Tx (e.g., FIG. 7) is applied to the indication of the precoding information and the number of layers. In this case, the UE determines the number of layers and precoding information (or precoding matrix (W)) to be applied to UL transmission based on the codepoint of a predetermined field and the table for 8Tx (e.g., FIG. 7).

[0114] On the other hand, if 4Tx (e.g., a table for 4Tx) is indicated by the DCI, the table for 4Tx is applied to the indication of the precoding information and the number of layers. In this case, the UE determines the number of layers and precoding information (or precoding matrix (W)) to be applied to UL transmission based on the codepoint in the predetermined field and the table for 4Tx.

[0115] The UE may control the interpretation / interpretation of certain fields of the DCI (e.g., the precoding information and layer number fields) depending on which table is used (or the size of each table).

[0116] Assume that the size of 8Tx (e.g., a table for 8 antenna ports / Tx) is the same as that of 4Tx (e.g., a table for 4 antenna ports / Tx). For example, this corresponds to the case where the number of combinations of the number of layers / TPMI index (corresponding to full / partial / noncoherent) in a table corresponding to the number of antenna ports of 4 or less is the same as the number of combinations of the number of layers / TPMI index (corresponding to full / partial / noncoherent) in a table corresponding to the number of antenna ports greater than 4.

[0117] In this case, the size of a predetermined field of DCI may be set to be the same for each Tx. The base station may use all bits of the predetermined field of DCI to indicate the precoding information and number of layers of a table for 8 Tx or the precoding information and number of layers of a table for 4 Tx (see FIG. 8A). The UE may determine the number of layers / TPMI index by taking into account all bits (or code points) of the predetermined field of DCI, regardless of the table to be applied (e.g., the table corresponding to which number of antenna ports is specified).

[0118] Assume a case where the size is different between 8Tx (e.g., a table for 8 antenna ports / Tx) and 4Tx (e.g., a table for 4 antenna ports / Tx). For example, this corresponds to a case where the number of combinations of the number of layers / TPMI index (corresponding to full / partial / noncoherent) in a table corresponding to the number of antenna ports of 4 or less is different from the number of combinations of the number of layers / TPMI index (corresponding to full / partial / noncoherent) in a table corresponding to the number of antenna ports of more than 4.

[0119] In this case, the maximum size of the predetermined field of the DCI may be determined from {table size for 8 Tx, table size for 4 Tx}. Also, for the smaller size of {table size for 8 Tx, table size for 4 Tx}, a part of the predetermined field (e.g., LSB or MSB) may be used, and the remaining field may be unused or ignored (see FIG. 8B ).

[0120] 8B illustrates a case where the table size for 8Tx (or the size of a predetermined field of DCI corresponding to 8Tx) is larger than the table size for 4Tx (or the size of a predetermined field of DCI corresponding to 4Tx). In this case, the size of a predetermined field of DCI may be determined based on the larger table size (here, the table size for 8Tx). When a table for 8Tx is indicated, the UE may determine the number of layers / TPMI index using all bits of the predetermined field. On the other hand, when a table for 4Tx is indicated, the UE may determine the number of layers / TPMI index using some bits of the predetermined field and ignore the remaining bits.

[0121] This makes it possible to use a common specified field to indicate the number of layers / TPMI index corresponding to each number of antenna ports, even if the table size corresponding to each number of antenna ports is different and the table to be used is dynamically indicated using DCI.

[0122] (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.

[0123] 9 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0124] 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.

[0125] 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.

[0126] 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))).

[0127] 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.

[0128] 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).

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0134] 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).

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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).

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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).

[0148] (Base Station) Fig. 10 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] The transmitter / receiver 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0164] 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.

[0165] The transceiver unit 120 may transmit information on a precoder type indicating a codebook subset, and downlink control information including a field indicating precoding information and the number of layers.

[0166] The control unit 110 may specify a transmit precoding matrix index and a number of layers to be applied to UL transmission by using information on the precoder type and the field of the downlink control information. When more than four antenna ports are supported in UL transmission, the correspondence between the codepoints in the field and the transmit precoding matrix index and the number of layers may be commonly defined / set among multiple codebook subsets.

[0167] (User Terminal) Fig. 11 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.

[0168] 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.

[0169] 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.

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] The transceiver unit 220 may receive information about a precoder type indicating a codebook subset, and downlink control information including a field indicating precoding information and the number of layers.

[0185] The control unit 210 may determine a transmit precoding matrix index and a number of layers to be applied to UL transmission based on information related to the precoder type and the field of the downlink control information. When more than four antenna ports are supported in UL transmission, the correspondence between the codepoints in the field and the transmit precoding matrix index and the number of layers may be commonly defined / set among multiple codebook subsets.

[0186] Based on the setting of predetermined upper layer parameters related to antenna ports, the control unit 210 may determine whether to apply a first association between code points in fields corresponding to four or fewer antenna ports and transmit precoding matrix indices and the number of layers (e.g., a 2Tx / 4Tx table), or a second association between code points in fields corresponding to more than four antenna ports and transmit precoding matrix indices and the number of layers (e.g., 8Tx).

[0187] Based on a predetermined field included in the downlink control information, the control unit 210 may determine whether to apply a first association between code points in a field corresponding to four or fewer antenna ports and a transmit precoding matrix index and the number of layers (e.g., a 2Tx / 4Tx table), or a second association between code points in a field corresponding to more than four antenna ports and a transmit precoding matrix index and the number of layers (e.g., 8Tx).

[0188] When the size of the second association is larger than the size of the first association and the control unit 210 applies the first association, the control unit 210 may determine the transmit precoding matrix index and the number of layers to apply to the UL transmission based on some code points of the field, and may ignore other code points of the field.

[0189] (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.

[0190] 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.

[0191] For example, a base station, a user terminal, or the like according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 12 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] 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).

[0201] 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.

[0202] 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.

[0203] (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.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] 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.

[0208] 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.

[0209] 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.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 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.

[0216] 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.

[0217] 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.

[0218] 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.

[0219] 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.

[0220] 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.

[0221] 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."

[0222] 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.

[0223] 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.

[0224] 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.

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] 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).

[0230] 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).

[0231] 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).

[0232] 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.

[0233] 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.

[0234] 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).

[0235] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0236] 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.

[0237] 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.

[0238] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] 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.

[0243] 13 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.

[0244] 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.

[0245] 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).

[0246] 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.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] 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.

[0251] 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).

[0252] 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.

[0253] 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)).

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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).

[0260] 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."

[0261] 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.

[0262] 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.

[0263] 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.

[0264] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "determination" may be considered to be "deciding" some action.

[0265] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0266] 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."

[0267] 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.

[0268] 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."

[0269] 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.

[0270] 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.

[0271] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. A receiving unit for receiving downlink control information (DCI) including a field indicating precoding information and a number of layers; A terminal having a control unit that, when more than four antenna ports are configured for uplink (UL) transmission, determines precoding information and the number of layers based on the field and a table for more than four antenna ports, and when four or fewer antenna ports are configured for UL transmission, determines precoding information and the number of layers based on the field and a table for four or fewer antenna ports.

2. A terminal as described in claim 1, wherein the bit size of the field is set separately when more than four antenna ports are configured for UL transmission and when four or fewer antenna ports are configured for UL transmission.

3. A step of receiving downlink control information (DCI) including a field indicating precoding information and a number of layers; A wireless communication method for a terminal, comprising: when more than four antenna ports are configured for uplink (UL) transmission, determining precoding information and the number of layers based on the field and a table for more than four antenna ports; and when four or fewer antenna ports are configured for UL transmission, determining precoding information and the number of layers based on the field and a table for four or fewer antenna ports.

4. A transmitter for transmitting downlink control information (DCI) including a field indicating precoding information and a number of layers; A base station having a control unit that, when more than four antenna ports are configured for uplink (UL) transmission, indicates precoding information and the number of layers based on the field and a table for more than four antenna ports, and when four or fewer antenna ports are configured for UL transmission, indicates precoding information and the number of layers based on the field and a table for four or fewer antenna ports.

5. A system having a terminal and a base station, The terminal includes: A receiving unit that receives downlink control information (DCI) including a field indicating precoding information and a number of layers; A control unit that determines precoding information and a number of layers based on the field and a table for antenna ports greater than four when more than four antenna ports are configured for uplink (UL) transmission, and determines precoding information and a number of layers based on the field and a table for antenna ports less than four when four or less antenna ports are configured for UL transmission, The base station, A system comprising a transmitter for transmitting the DCI.