Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is provided with: a reception unit that receives information indicating activation of a transform precoding for 8-port transmission; and a control unit that controls the 8-port transmission by applying the transform precoding. According to one embodiment of the present disclosure, UL transmission using more than four antenna ports can be appropriately controlled.

Description

Technical Field

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

[0002] In the Universal Mobile Telecommunication System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rates and low latency (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been standardized for the purpose of further increasing the capacity and sophistication of LTE (Release (Rel.) 8 and 9 of the Third Generation Partnership Project (3GPP (registered trademark))).

[0003] Successor systems of LTE (also called, for example, fifth generation mobile communication system (5G), 5G+(plus), sixth generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: 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 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In Rel.15 NR, up to 4 layers of uplink (UL) multi-input multi-output (MIMO) transmission are supported. For future NR, in order to achieve higher spectrum efficiency, support for UL transmission with more than 4 layers is being studied. For example, for Rel.18 NR, the maximum 6-rank transmission using 6 antenna ports and the maximum 6 or 8-rank transmission using 8 antenna ports are being studied.

[0009] However, there is no research on how to determine the precoding matrix for UL transmission using more than 4 antenna ports. For example, there is no research on whether the transformation precoding can be effectively set for the UL transmission. If this is not clear, there is a concern that the increase in communication throughput will be suppressed.

[0010] Therefore, the present disclosure will provide, as one of its objects, a terminal, a wireless communication method, and a base station capable of appropriately controlling UL transmission using more than 4 antenna ports.

[0011] Means for solving problems

[0012] A terminal according to one aspect of the present disclosure includes: a receiving unit that receives information indicating activation of transform precoding for 8-port transmission; and a control unit that controls the 8-port transmission to be performed by applying transform precoding.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, UL transmission using more than four antenna ports can be appropriately controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a diagram showing an example of the relationship between codebook subsets and TPMI indexes.

[0016] Figure 2 This is equivalent to a table of precoding matrix W for single-layer (rank 1) transmission using 2 antenna ports in Rel. 16 NR.

[0017] Figure 3A as well as Figure 3B This is a diagram showing an example of the correspondence between the precoding information and the value of the layer number field, the number of layers, and the TPMI in Rel. 16 NR.

[0018] Figure 4 A to Figure 4D This is a diagram showing an example of the correspondence between the value of the antenna port field and the information related to DMRS in Rel. 16 NR.

[0019] Figure 5 It is a diagram showing an example of a codebook according to the second embodiment.

[0020] Fig. 6A as well as Figure 6B This is a diagram showing an example of the correspondence relationship between the precoding information and the value of the layer number field, the number of layers, and the TPMI in the third embodiment.

[0021] Figure 7 This is a diagram showing an example of the correspondence relationship between the value of the antenna port field and the information related to the DMRS in the fourth embodiment.

[0022] Figure 8 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0023] Fig. 9 This is a diagram showing an example of the structure of a base station involved in one embodiment.

[0024] Fig.10 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0025] Fig.11 This is a diagram showing an example of the hardware configuration of a base station and a user terminal involved in one embodiment.

[0026] Fig.12 It is a diagram showing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

[0027] (Control of SRS and PUSCH transmission)

[0028] In Rel.15 NR, a terminal (user terminal, User Equipment (UE)) may also receive information (SRS configuration information, e.g., parameters in the RRC control element "SRS-Config") used in the transmission of a measurement reference signal (e.g., a sounding reference signal (SRS)).

[0029] Specifically, the UE may also receive at least one of information related to one or more SRS resource sets (SRS resource set information, for example, RRC control element "SRS-ResourceSet") and information related to one or more SRS resources (SRS resource information, for example, RRC control element "SRS-Resource").

[0030] An SRS resource set may also be associated with a specific number of SRS resources (or a specific number of SRS resources may be grouped). Each SRS resource may also be identified by an SRS resource identifier (SRS Resource Indicator (SRI)) or an SRS resource ID (Identifier).

[0031] The SRS resource set information may also 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 the usage of the SRS.

[0032] Here, the SRS resource type may also represent any one of periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic CSI (A-SRS). In addition, the UE may also periodically (or periodically after activation) send P-SRS and SP-SRS, and send A-SRS based on the SRS request of the DCI.

[0033] In addition, the purpose (RRC parameter "usage", L1 (Layer-1) parameter "SRS-SetUse") can also be, for example, beam management (beamManagement), codebook (codebook (CB)), noncodebook (noncodebook (NCB)), antenna switching, etc. SRS for codebook or non-codebook purposes can also be used to determine the precoder transmitted by the codebook-based or non-codebook-based uplink shared channel (Physical Uplink Shared Channel (PUSCH)) based on SRI.

[0034] For example, in the case of codebook-based transmission, the UE may also determine the precoder (precoding matrix) for PUSCH transmission based on SRI, Transmitted Rank Indicator (TRI) and Transmitted Precoding Matrix Indicator (TPMI). In the case of non-codebook-based transmission, the UE may also determine the precoder for PUSCH transmission based on SRI.

[0035] SRS resource information may also include SRS resource ID (SRS-ResourceId), SRS port number, SRS port number, send comb, SRS resource mapping (for example, time and / or frequency resource location, resource offset, resource period, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), jump association information, SRS resource type, sequence ID, SRS spatial relationship information, etc.

[0036] The spatial relationship information of SRS (e.g., RRC information element "spatialRelationInfo") may also indicate the spatial relationship information between a specific reference signal and SRS. The specific reference signal may also be at least one of a synchronization signal / broadcast channel (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 also be referred to as a synchronization signal block (SSB).

[0037] The spatial relationship information of SRS may also include at least one of an SSB index, a CSI-RS resource ID, and an SRS resource ID as an index of the above-mentioned specific reference signal.

[0038] In addition, in the present disclosure, the SSB index, SSB resource ID, and SSB resource indicator (SSBRI) may also be overwritten with each other. In addition, the CSI-RS index, CSI-RS resource ID, and CSI-RS resource indicator (CSI-RS Resource Indicator (CRI)) may also be overwritten with each other. In addition, the SRS index, SRS resource ID, and SRI may also be overwritten with each other.

[0039] The spatial relationship information of the SRS may also include a serving cell index, a BWP index (BWP ID), etc. corresponding to the above-mentioned specific reference signal.

[0040] When spatial relationship information related to SSB or CSI-RS and SRS is set for a certain SRS resource, the UE may also use the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter (spatial domain receive filter) used for receiving the SSB or CSI-RS to transmit the SRS resource. In this case, the UE may also assume that the UE receive beam of the SSB or CSI-RS is the same as the UE transmit beam of the SRS.

[0041] When spatial relationship information related to another SRS (reference SRS) and the SRS (target SRS) is set for a certain SRS (target SRS) resource, the UE may also transmit the target SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter (spatial domain transmit filter) used for transmitting the reference SRS. That is, in this case, the UE may also assume that the UE transmit beam of the reference SRS is the same as the UE transmit beam of the target SRS.

[0042] The UE may also determine the spatial relationship of the PUSCH scheduled by the DCI based on the value of a specific field (e.g., SRS resource identifier (SRI) field) in the DCI (e.g., DCI format 0_1). Specifically, the UE may also use the spatial relationship information (e.g., RRC information element "spatialRelationInfo") of the SRS resource determined based on the value of the specific field (e.g., SRI) for PUSCH transmission.

[0043] In Rel.15 / 16 NR, when codebook-based transmission is used for PUSCH, the UE can also be configured with an SRS resource set with up to 2 SRS resources for codebook purposes through RRC, and one of the up to 2 SRS resources is indicated through DCI (1-bit SRI field). The transmit beam of PUSCH is specified by the SRI field.

[0044] The UE may also determine the TPMI and the number of layers (transmission rank) for the PUSCH based on the precoding information and the number of layers field (hereinafter also referred to as the precoding information field). The UE may also select a precoder from an uplink codebook for the same number of ports as the number of SRS ports based on the TPMI, the number of layers, etc., wherein the number of SRS ports is represented by a high-layer parameter "nrofSRS-Ports" set for the SRS resource specified by the SRI field.

[0045] In Rel.15 / 16 NR, when non-codebook based transmission is used for PUSCH, the UE can also be configured with an SRS resource set with a maximum of 4 SRS resources for non-codebook use through RRC, and one or more of the maximum 4 SRS resources can be indicated through DCI (2-bit SRI field).

[0046] The UE may also determine the number of layers (transmission rank) used 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 used for the PUSCH. In addition, the UE may also calculate the precoder of the SRS resources.

[0047] When a CSI-RS (also referred to as an associated CSI-RS) associated with the SRS resource (or the SRS resource set to which the SRS resource belongs) is set by a higher layer, the transmit beam of the PUSCH can also be calculated based on (the measurement of) the set associated CSI-RS. Otherwise, the transmit beam of the PUSCH can also be specified by the SRI.

[0048] In addition, the UE may also be configured to use codebook-based PUSCH transmission or non-codebook-based PUSCH transmission through a high-level parameter "txConfig" indicating a transmission scheme. This parameter may also indicate a value of "codebook" or "non-codebook".

[0049] In the present disclosure, codebook-based PUSCH (codebook-based PUSCH transmission, codebook-based transmission) may also refer to a PUSCH in which "codebook" is set as a transmission scheme for a UE. In the present disclosure, non-codebook-based PUSCH (non-codebook-based PUSCH transmission, non-codebook-based transmission) may also refer to a PUSCH in which "non-codebook" is set as a transmission scheme for a UE.

[0050] (Determination of PUSCH precoder in codebook (CB) transmission)

[0051] As described above, in the case of codebook (CB) based transmission, the UE may determine the precoder to be used for PUSCH transmission based on SRI, TRI, TPMI, and the like.

[0052] SRI, TRI, TPMI, etc. can also be notified to the UE using Downlink Control Information (DCI). SRI can be specified by the SRS Resource Indicator field (SRI field) of DCI, or by the parameter "srs-ResourceIndicator" included in the RRC information element "ConfiguredGrantConfig" of the configured grant PUSCH.

[0053] TRI and TPMI may also be specified through the precoding information and number of layers field (“Precoding information and number of layers” field) of the DCI. For simplicity, the precoding information and number of layers field is also referred to as the precoding information field.

[0054] The UE may also report UE capability information related to the precoder type, and the precoder type based on the UE capability information is set from the base station through high-layer signaling. The UE capability information may also be information about the precoder type used by the UE in PUSCH transmission (for example, it may also be represented by the RRC parameter "pusch-TransCoherence").

[0055] The UE may also determine the precoder used in PUSCH transmission based on the information of the precoder type (e.g., RRC parameter "codebookSubset") included in the PUSCH configuration information notified by higher layer signaling (e.g., the "PUSCH-Config" information element of RRC signaling). The UE may also be configured with a subset of the PMI specified by the TPMI through codebookSubset.

[0056] In addition, the precoder type can also be specified by any one of fully coherent (full coherent, fully coherent), partially coherent (partial coherent) and non coherent (non coherent, non coherent) or a combination of at least two of them (for example, it can also be represented by parameters such as "fullyAndPartialAndNonCoherent" and "partialAndNonCoherent").

[0057] For example, the RRC parameter "pusch-TransCoherence" indicating the UE capability may also indicate full coherence, partial coherence, or non-coherence. In addition, the RRC parameter "codebookSubset" may also indicate "fully And Partial And Non-Coherent", "partial And Non-Coherent", or "non-Coherent".

[0058] Full coherence may also mean that all antenna ports used in transmission are synchronized (which may also be expressed as being able to make the phases consistent, being able to perform phase control for each coherent antenna port, being able to appropriately apply a precoder for each coherent antenna port, etc.). Partial coherence may also mean that synchronization is achieved between some of the antenna ports used in transmission, but the ports are not synchronized with other ports. Incoherence may also mean that synchronization is not achieved between the antenna ports used in transmission.

[0059] In addition, a UE supporting a fully coherent precoder type may also be considered to support a partially coherent and non-coherent precoder type. A UE supporting a partially coherent precoder type may also be considered to support a non-coherent precoder type.

[0060] In the present disclosure, precoder type, coherency, PUSCH transmission coherence, coherent type, coherence type, codebook type, codebook subset, codebook subset type, etc. may also be replaced with each other.

[0061] The UE may determine a precoding matrix corresponding to a TPMI index obtained according to DCI (eg, DCI format 0_1, the same below) scheduled for UL transmission based on multiple precoders (which may also be referred to as precoding matrices, codebooks, etc.) used for CB-based transmission.

[0062] Figure 1 : is a diagram showing an example of the relationship between the codebook subset and the TPMI index. Figure 1 A table corresponding to the precoding matrix W for single-layer (rank 1) transmission using 4 antenna ports when transform precoding (may also be referred to as transform precoder) is enabled in Rel.16 NR. Figure 1The corresponding Ws are shown in ascending order of TPMI index from left to right.

[0063] Figure 1 The correspondence relationship between the TPMI index and the corresponding W (which may also be referred to as a table) is also referred to as a codebook. A portion of the codebook is also referred to as a codebook subset.

[0064] exist Figure 1 In the case where the codebook subset (codebookSubset) is fullyAndPartialAndNonCoherent, for single-layer transmission, the UE is notified of any TPMI from 0 to 27. In addition, when the codebook subset is partialAndNonCoherent, for single-layer transmission, the UE is set to any TPMI from 0 to 11. When the codebook subset is nonCoherent, the UE is set to any TPMI from 0 to 3 for single-layer transmission.

[0065] Figure 2 This table corresponds to the precoding matrix W for single-layer (rank 1) transmission using 2 antenna ports in Rel.16 NR.

[0066] according to Figure 2 , the TPMI notified to the UE for 2-port single layer transmission is 0 to 5 (codebook subsets are full and partial and non-coherent) or 0 to 1 (codebook subset is non-coherent).

[0067] The precoding matrix W for single-layer transmission using four antenna ports when transform precoding is valid may be defined separately from the precoding matrix W for single-layer transmission using four antenna ports when transform precoding is invalid. On the other hand, the precoding matrix W for single-layer transmission using two antenna ports is common and has nothing to do with whether transform precoding is valid or invalid.

[0068] In addition, a precoding matrix in which only one element in each column is not 0 may also be referred to as a non-coherent codebook. A precoding matrix in which only a certain number (greater than 1, but not all elements in the column) of elements in each column are not 0 may also be referred to as a partially coherent codebook. A precoding matrix in which all elements in each column are not 0 may also be referred to as a fully coherent codebook.

[0069] Non-coherent codebooks and partially coherent codebooks may also be referred to as antenna selection precoders, antenna port selection precoders, etc. For example, non-coherent codebooks (non-coherent precoders) may also be referred to as 1-port selection precoders, 1-port port selection precoders, etc. In addition, partially coherent codebooks (partially coherent precoders) may also be referred to as x-port (x is an integer greater than 1) selection precoders, x-port port selection precoders, etc. Fully coherent codebooks may also be referred to as non-antenna selection precoders, full-port precoders, etc.

[0070] In addition, in the present disclosure, the partially coherent codebook may also correspond to the following codebook: from the codebook (precoding matrix) corresponding to the TPMI specified by DCI for codebook-based transmission for a UE to which a partially coherent codebook subset is set (for example, RRC parameter "codebookSubset" = "partialAndNonCoherent"), a codebook is removed (that is, if it is a single-layer transmission with 4 antenna ports, the codebook with TPMI=4 to 11) corresponding to the TPMI specified by the DCI for codebook-based transmission for a UE to which a partially coherent codebook subset is set (for example, RRC parameter "codebookSubset" = "partialAndNonCoherent")

[0071] In addition, in the present disclosure, the fully coherent codebook may also correspond to the following codebook: from the codebook (precoding matrix) corresponding to the TPMI specified by DCI for codebook-based transmission for a UE set with a fully coherent codebook subset (for example, RRC parameter "codebookSubset" = "fullyAndPartialAndNonCoherent"), the codebook corresponding to the TPMI specified for a UE set with a partially coherent codebook subset (for example, RRC parameter "codebookSubset" = "partialAndNonCoherent") is removed (that is, if it is a single-layer transmission with 4 antenna ports, the codebook with TPMI = 12 to 27).

[0072] Hereinafter, in the present disclosure, for simplicity, the non-coherent precoder, the partially coherent precoder, and the fully coherent precoder are also simply referred to as NC (non coherent) precoder, PC (partial coherent) precoder, and FC (full coherent) precoder, respectively.

[0073] In addition, hereinafter, in the present disclosure, for the sake of simplicity, the NC / PC / FC precoder for i-layer (i is an integer, i=1 for single layer) transmission used for n antenna ports (n is an integer) is also simply referred to as n-port i-layer NC / PC / FC precoder (n-port i-layer NC / PC / FC precoder).

[0074] In addition, from Figure 2 It can be seen that since there is no partially coherent precoder for transmission of two antenna ports, the setting of partial and incoherent codebook subsets may not be applied to the two antenna ports.

[0075] (Precoding information field)

[0076] As described above, the UE can determine the TPMI and the number of layers (transmission rank) used for the PUSCH based on the precoding information field of the DCI (e.g., DCI format 0_1 / 0_2) that schedules the PUSCH. Specifically, the UE can also refer to the correspondence (table) between the value of the precoding information field, the number of layers, and the TPMI to determine the TPMI and the number of layers corresponding to the value of the notified field.

[0077] For the codebook-based PUSCH, the UE decides the above correspondence to be referred to based on the effective or invalid setting of the transform precoder for PUSCH (for example, the high-level parameter transformPrecoder), the setting of the codebook subset for PUSCH (for example, the high-level parameter codebookSubset), the setting of the maximum number of layers for PUSCH (for example, the high-level parameter maxRank), the setting of the uplink full power transmission for PUSCH (for example, the high-level parameter ul-FullPowerTransmission), the number of antenna ports for PUSCH, etc.

[0078] Figure 3A as well as Figure 3B This is a diagram showing an example of the correspondence between the value of the precoding information and the number of layers field, the number of layers, and the TPMI in Rel. 16 NR. In addition, anyone skilled in the art should be able to understand that the "bit field mapped to the index" shown in the diagram represents the value of the precoding information and the number of layers field.

[0079] Figure 3A The correspondence relationship is a correspondence relationship for four antenna ports when the transform precoder is set to be effective and the uplink full power transmission is not set or is set to full power mode 2 (fullpowerMode2).

[0080] Figure 3BThe correspondence relationship is a correspondence relationship for four antenna ports when the transform precoder is set to be effective and the uplink full power transmission is set to full power mode 1 (fullpowerMode1).

[0081] exist Figure 3A In the precoding information field, when a fully And Partial And Non Coherent codebook subset is set for the UE, the precoding information field is 5 bits, when a partially coherent codebook subset is set, the precoding information field is 4 bits, and when a non-coherent codebook subset is set, the precoding information field is 2 bits.

[0082] exist Figure 3B In the precoding information field, when a partially coherent (partialAndNonCoherent) codebook subset is configured for the UE, the precoding information field is 4 bits, and when a non-coherent (nonCoherent) codebook subset is configured for the UE, the precoding information field is 3 bits.

[0083] In addition, if Figure 3A as well as Figure 3B As shown, the number of layers and TPMI corresponding to the value of a certain precoding information field can be the same (common), regardless of the codebook subset set for the UE. Figure 3A In the precoding information field, the number of layers represented by the value = 0-3 and the TPMI for the fully And Partial And Non Coherent, partial And Non Coherent, and non Coherent codebook subsets can be the same. Figure 3A In the example, the number of layers represented by the value of the precoding information field = 0-11 and the TPMI precoding subsets for fully And Partial And Non Coherent and partial And Non Coherent can be the same.

[0084] In addition, the precoding information field may be 0 bits for a non-codebook-based PUSCH. In addition, the precoding information field may be 0 bits for a codebook-based PUSCH of one antenna port.

[0085] (Antenna Port field)

[0086] The UE can determine information related to the demodulation reference signal (DMRS) used for the PUSCH (DMRS without data, number of CDM groups, DMRS port (antenna port index), number of front-load symbols, etc.) based on the antenna port field ("Antennaports" field) of the DCI (e.g., DCI format 0_1 / 0_2) that schedules the PUSCH. Specifically, the UE can also refer to the correspondence (table) between the value of the antenna port field and the information related to the above DMRS to determine the information related to the DMRS corresponding to the value of the notified field.

[0087] The UE may also decide the above correspondence to be referenced based on the effective or invalid setting of the transform precoder for PUSCH (e.g., the high-level parameter transformPrecoder), the DMRS type (e.g., the high-level parameter dmrs-Type), the maximum length of the DMRS (e.g., maxLength), etc.

[0088] In addition, the UE may also be configured with parameters for indicating activation of π / 2 binary phase shift keying (BPSK) modulation (e.g., high-layer parameters tp-pi2BPSK in the PUSCH setting information), and parameters for DMRS for indicating whether a low peak-to-average power ratio (Peak-to-Average Power Patio (PAPR)) is applied to the π / 2 BPSK modulated PUSCH (e.g., dmrs-UplinkTransformPrecoding-r16), and refer to different above-mentioned correspondences in the case of using π / 2 BPSK modulation (specified by the Modulation and Coding Scheme (MCS) field (or MCS index) included in the above-mentioned DCI) and in the case of not using π / 2 BPSK modulation. In addition, in the present disclosure, for simplicity, the former case is referred to as "the case of using π / 2 BPSK modulation", and the latter case is referred to as "the case of not using π / 2 BPSK modulation".

[0089] In addition, in the case of using π / 2 BPSK modulation, the DMRS port corresponding to the antenna port field is rewritten as a value for DMRS port and DMRS sequence generation (also denoted as n SCID ). SCIDIt can also be used to initialize a generator of a sequence (binary sequence, pseudo-random sequence) used in DMRS sequence generation.

[0090] Figure 4 A- Figure 4D This is a diagram showing an example of the correspondence between the value of the antenna port field and the information related to DMRS in Rel. 16 NR. In addition, it is obvious to those skilled in the art that the “value” shown in the diagram represents the value of the antenna port field.

[0091] Figure 4 The corresponding relationship of A represents the case where the transform precoder is set to be effective, the DMRS type=1 and the maximum length of the DMRS=1, and π / 2 BPSK modulation is not used.

[0092] Figure 4 The corresponding relationship of B indicates the case where the transform precoder is set to be effective, the DMRS type=1 and the maximum length of the DMRS=1, and π / 2 BPSK modulation is used.

[0093] Figure 4C The corresponding relationship represents the case where the transform precoder is set to be valid, the DMRS type = 1 and the maximum length of the DMRS = 2, and π / 2 BPSK modulation is not used.

[0094] Figure 4D The corresponding relationship represents the case where the transform precoder is set to be valid, the DMRS type = 1 and the maximum length of the DMRS = 2, and π / 2 BPSK modulation is used.

[0095] (Transmission with more than 4 antenna ports)

[0096] In Rel.15 / 16 NR, up to 4 layers of uplink (UL) multi-input multi-output (MIMO) transmission are supported. For future wireless communication systems, in order to achieve higher spectrum efficiency, research is being conducted to support UL transmission with more than 4 layers. For example, for Rel.18 NR, research is being conducted on maximum 6-rank transmission using 6 antenna ports, maximum 6 or 8-rank transmission using 8 antenna ports, etc.

[0097] For example, the eight antennas can be configured in one dimension (1 dimensional (1D)) or in two dimensions (2dimensional (2D). In the former case, for example, an antenna structure having four cross-polarized antennas arranged in the horizontal direction is considered, and in the latter case, an antenna structure having two cross-polarized antennas arranged in the horizontal and vertical directions is considered.

[0098] In addition, the antenna layout is not limited to this. For example, the number of panels on which antennas are configured, the orientation of the panels, the coherence of each panel / antenna (complete coherence, partial coherence, incoherence, etc.), the arrangement of antennas in a specific direction (horizontal, vertical, etc.), and the polarized antenna structure (single polarization, cross polarization, the number of polarization planes, etc.) can also be arbitrarily set.

[0099] In addition, after supporting the transmission of one codeword (CW) in one PUSCH in Rel.15 / 16 NR, the UE is studying the transmission of more than one CW in one PUSCH for Rel.18 NR. For example, support for 2 CW transmission for ranks 5-8, support for 2 CW transmission for ranks 2-8, etc. is being studied.

[0100] In addition, in Rel.15 and Rel.16 UEs, it is assumed that only one beam / panel is used for UL transmission at a time, but in Rel.17 and later, in order to improve UL throughput and reliability, simultaneous UL transmission (for example, PUSCH transmission) of multiple beams / multiple panels is being studied for TRPs greater than 1. In addition, simultaneous PUSCH transmission of multiple beams / multiple panels can correspond to PUSCH transmission with a number of layers greater than 4 or less than 4.

[0101] In addition, a precoding matrix for UL transmission using more than 4 antenna ports (the number of antenna ports is greater than 4) is being studied. For example, a codebook for 8-port transmission (which may also be referred to as an 8 TX UL codebook, etc.) is being studied.

[0102] However, no research has been conducted on how to determine the precoding matrix for UL transmission using more than 4 antenna ports (the number of antenna ports is greater than 4). For example, no research has been conducted on whether the configuration transformation precoding can be set to be effective for the UL transmission, and if so, how the UE determines the information related to TPMI and DMRS. If these are not clear, there is a concern that the increase in communication throughput will be suppressed.

[0103] Therefore, the inventors of the present invention have conceived a method for appropriately performing UL transmission using more than four antenna ports.

[0104] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0105] In the present disclosure, "A / B" and "at least one of A and B" may be replaced with each other. In addition, in the present disclosure, "A / B / C" may also mean "at least one of A, B, and C".

[0106] In the present disclosure, activate, deactivate, indicate (or specify), select, configure, update, determine, etc. may also be mutually rewritten. In the present disclosure, support, control, controllable, operate, and can operate, etc. may also be mutually rewritten.

[0107] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, high-layer parameters, fields, Information Element (IE), settings, etc. may also be overwritten with each other. In the present disclosure, Medium Access Control (MAC) Control Element (CE), update commands, activation / deactivation commands, etc. may also be overwritten with each other.

[0108] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0109] In the present disclosure, MAC signaling may also use, for example, MAC Control Element (MACCE), MAC Protocol Data Unit (PDU), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0110] In the present disclosure, the physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI)), etc.

[0111] In the present disclosure, an index, an identifier (ID), an indicator, a resource ID, etc. may also be overwritten with each other. In the present disclosure, a sequence, a list, a set, a group, a group, a cluster, a subset, etc. may also be overwritten with each other.

[0112] In the present disclosure, panel, UE panel, panel group, beam, beam group, precoder, uplink (UL) transmission entity, transmission / reception point (TRP), base station, spatial relation information (SRI), spatial relation, SRS resource indicator (SRS ResourceIndicator (SRI)), control resource set (CORESET), physical downlink shared channel (PDSCH), codeword (CW), transport block (TB), reference signal (RS), antenna, antenna element (element), 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 (Code Division Multiplexing (CDM)) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group), resources (e.g., reference signal resources, SRS resources), resource sets (e.g., reference signal resource sets), CORESET pool, downlink transmission configuration indication state (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 assumptions, etc. can also be rewritten mutually.

[0113] In addition, the spatial relationship information identifier (Identifier (ID)) (TCI state ID) and the spatial relationship information (TCI state) can also be overwritten with each other. "Spatial relationship information" can also be overwritten with "a collection of spatial relationship information", "one or more spatial relationship information", etc. TCI state and TCI can also be overwritten with each other.

[0114] In the following embodiments, "plurality" and "two" may be replaced with each other.

[0115] The number of layers of PUSCH transmission in the following embodiments may be greater than 4 or less than 4. For example, PUSCH transmission of two CWs in the present disclosure may also be performed using a number of layers less than 4 (eg, 2). In addition, the maximum number of layers is not limited to 4 or more, and may also be less than 4.

[0116] In addition, the transmission (UL transmission, PUSCH transmission) in the following embodiments may be based on the use of multiple panels or may not be based on the use of multiple panels (it may be applied regardless of the panels).

[0117] In the present disclosure, “transform precoding is set” and “transform precoding is set to be effective (enabled)” may be replaced with each other.

[0118] In addition, in the present disclosure, “having the ability to…” may be replaced with “the ability to support / report…”.

[0119] (Wireless Communication Method)

[0120] <First Embodiment>

[0121] The first embodiment relates to transform precoding for transmission using 8 antenna ports (may also be referred to as 8-port transmission).

[0122] In addition, the fact that transform precoding is effective for a certain signal also means that the signal is transmitted using a Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) waveform (or transform precoding is applied). In addition, the fact that transform precoding is ineffective for a certain signal also means that the signal is transmitted using a Cyclic Prefic OFDM (CP-OFDM) waveform (or transform precoding is not applied).

[0123] [Implementation method 1.1]

[0124] For 8-port PUSCH transmission, the UE may not support transform precoding (DFT-s-OFDM waveform) but only support CP-OFDM waveform.

[0125] For example, a UE configured with eight ports may not expect that a parameter indicating a transform precoder (eg, transformPrecoder) is set to “enabled” in PUSCH configuration information (eg, PUSCH-Config information element of RRC).

[0126] In addition, when the parameter of the transform precoder (e.g., msg3-transformPrecoder) used for sending message 3 (in the random access process) is set to indicate "valid (enabled)", the UE set to 8 ports can also expect that only the parameter indicating the transform precoder (e.g., transformPrecoder) is set to "invalid (disabled)" in the PUSCH setting information (e.g., the PUSCH-Config information element of RRC) (it is also possible not to expect that the parameter of the transform precoder does not exist in the PUSCH setting information). This is because it is stipulated in the existing standard that when the parameter of the transform precoder does not exist in the PUSCH setting information, the value of the parameter of the transform precoder used for sending message 3 is applied as the value of the parameter.

[0127] In Embodiment 1.1, the UE may be configured with any one of the following through RRC signaling: PUSCH transmission with a port number greater than 4 using CP-OFDM, or PUSCH transmission with a port number less than 4 using DFT-sOFDM.

[0128] In addition, in implementation mode 1.1, when the base station sets the parameters of the above-mentioned transform precoder (for example, transformPrecoder) for the UE, it can also perform the following control: when the UE is enabled to transmit with a port number less than 4, both "valid" and "invalid" can be specified, and when the UE is enabled to transmit with a port number greater than 4, only "invalid" can be specified.

[0129] [Implementation method 1.2]

[0130] The UE may also support transform precoding (DFT-s-OFDM waveform) for 8-port transmission. For example, a UE supporting 8-port transmission may support the application of transform precoding in 1 layer (which may be interchangeable with a single layer in the present disclosure) of PUSCH in addition to CP-OFDM in 1 to 8 layers of PUSCH.

[0131] For example, for a UE configured with eight ports, a parameter indicating a transform precoder (eg, transformPrecoder) may be configured to be “enabled” in PUSCH configuration information (eg, PUSCH-Config information element of RRC).

[0132] [Implementation method 1.3]

[0133] For 8-port transmission, the UE may be configured with a transform precoder based on the UE's capabilities. For example, a UE having / supporting / configured 8 ports (or 8-port transmission) may also report to the network UE capability information indicating support for the transform precoder in layer 1 PUSCH for 8-port transmission.

[0134] Furthermore, for a UE configured with eight ports, a parameter indicating a transform precoder (eg, transformPrecoder) may be configured to be “enabled” in PUSCH configuration information (eg, PUSCH-Config information element of RRC).

[0135] [Modification of the first embodiment]

[0136] The first embodiment has been described assuming that the PUSCH is dynamically scheduled by DCI (dynamic PUSCH), but the present invention is not limited to this.

[0137] For example, the PUSCH in the first embodiment may be a configured grant PUSCH controlled based on RRC / DCI. In this case, for example, the above-mentioned PUSCH configuration information may be rewritten as configured grant PUSCH configuration information (eg, ConfiguredGrantConfig information element of RRC).

[0138] Furthermore, the PUSCH in the first embodiment may be a PUSCH using π / 2 BPSK modulation.

[0139] For example, if the case where these rewrites are applied to implementation 1.3 is described as an example, the UE may also report to the network UE capability information indicating support for the following: transform precoding in layer 1 PUSCH with configured grant configuration when 8 ports (or 8-port transmission) are provided / supported / configured. In addition, the UE may also report to the network UE capability information indicating support for the following: low PAPR DMRS for PUSCH with transform precoding and π / 2 BPSK modulation when 8 ports (or 8-port transmission) are provided / supported / configured and transform precoding is configured.

[0140] In addition, whether transform precoding can be set together with a specific or different full-power transmission mode can be set by the UE through higher layer signaling, or can be determined based on a report of UE capabilities.

[0141] According to the first embodiment described above, it is possible to appropriately determine whether or not transform precoding for 8-port transmission is applied.

[0142] <Second Embodiment>

[0143] The second embodiment relates to a precoding matrix for a single-layer PUSCH with transform precoding for 8-port transmission.

[0144] The codebook (table of precoding matrix W) for a single-layer PUSCH with transform precoding for 8-port transmission may be the same as or different from the codebook for a single-layer PUSCH without transform precoding for 8-port transmission.

[0145] The codebook for a single-layer PUSCH with transform precoding for 8-port transmission may also include a precoding matrix W based on a 2 / 4-port 1-layer NC precoder / PC precoder / FC precoder. In addition, the 2 / 4-port 1-layer NC precoder / PC precoder / FC precoder may include a precoding matrix W specified in an existing standard (e.g., Figure 1 The present invention may include a precoder (included in the present invention) and may also include a precoder that is not currently available.

[0146] Figure 5 This is a diagram showing an example of precoding involved in the second embodiment. This example is equivalent to a table of precoding matrix W for single-layer (rank 1) transmission using 8 antenna ports when transform precoding is effective. The precoder referenced in this example is a 1-layer precoder, so "1 layer" is omitted for description.

[0147] In addition, each 8-port NC / PC / FC precoder is adjusted so that the coefficient (or the absolute value of each component) becomes 1 / √8 (or a specific value), but the present invention is not limited to this.

[0148] The codebook may also include an 8-port NC precoder. The 8-port NC precoder may also be a 1-port selection precoder among the 8 ports. In addition, 8 types of 8-port NC precoders may be considered, but not all of them may be included in the codebook.

[0149] The codebook may also include an 8-port PC precoder. The 8-port PC precoder may also include, for example, at least one of the following:

[0150] - 8-port PC precoder based on 1 4-port PC precoder (2 coherent ports);

[0151] - 8-port PC precoder based on 1 4-port FC precoder (4 coherent ports);

[0152] - 8-port PC precoder based on 1 4-port FC precoder (4 coherent ports) and 1 4-port PC precoder (2 coherent ports).

[0153] The codebook may also include an 8-port FC precoder. The 8-port FC precoder may also include, for example, at least one of the following:

[0154] - 8-port FC precoder based on 1 or 2 4-port FC precoders;

[0155] -Precoder W of the existing Rel. 15 / 16 NR DL Type I single-panel codebook i_{1,1},i_{1,2},i_{2} (1) (or a precoder that enhances / deforms this precoder).

[0156] In addition, for each precoder in this example, phase adjustment (co-phasing) with respect to the base precoder may be considered or may not be considered. In addition, phase adjustment may also be rewritten as phase alignment, phase compensation, etc.

[0157] According to the second embodiment described above, it is possible to appropriately use the 8-bit UL transmission codebook.

[0158] <Third Embodiment>

[0159] The third embodiment relates to the correspondence between the value of the precoding information and number of layers field, the number of layers, and the TPMI for a single-layer PUSCH with transform precoding for 8-port transmission.

[0160] The correspondence between the precoding information and the value of the number of layers field, the number of layers, and the TPMI for a single-layer PUSCH with transform precoding for 8-port transmission may be different when uplink full power transmission is not set or full power mode 2 (fullpowerMode2) is set, and when uplink full power transmission is set to full power mode 1 (fullpowerMode1), or may be based on Figure 3A as well as Figure 3B The corresponding relationship shown.

[0161] Fig. 6A as well as Figure 6B This is a diagram showing an example of the correspondence relationship between the precoding information and the value of the layer number field, the number of layers, and the TPMI in the third embodiment.

[0162] Fig. 6AThe correspondence relationship is a correspondence relationship for 8 antenna ports when the transform precoder is set to be effective and the uplink full power transmission is not set or is set to full power mode 2 (fullpowerMode2).

[0163] Figure 6B The correspondence relationship is a correspondence relationship for 8 antenna ports when the transform precoder is set to be effective and the uplink full power transmission is set to full power mode 1 (fullpowerMode1).

[0164] Fig. 6A The precoding information field can represent at most the following values:

[0165] - In the case of a non-coherent codebook subset: X1 (X1 is an integer) corresponding to TPMI=Y1 (Y1 is an integer);

[0166] - In the case of a partially coherent (partialAndNonCoherent) codebook subset: X2 (X2≥X1) corresponding to TPMI=Y2 (Y2≥Y1);

[0167] - When a fully coherent (fullAndPartialAndNonCoherent) codebook subset is set: X3 (X3≥X2) corresponding to TPMI=Y3 (Y3≥Y2).

[0168] exist Figure 6B The precoding information field can represent at most the following values:

[0169] - In the case of a non-coherent codebook subset: A1 (A1 is an integer) corresponding to TPMI=B1 (B1 is an integer);

[0170] - In the case of a partially coherent (partialAndNonCoherent) codebook subset: A2 (A2≥A1) corresponding to TPMI=B2 (B2≥B1).

[0171] Here, Y1 / Y2 / Y3 / B1 / B2 as the largest TPMI index and even the size of the precoding information field may be related to the codebook in the second embodiment, and may also be set to the UE through higher layer signaling.

[0172] In addition, in the correspondence relationship of the third embodiment, only one layer may be designated.

[0173] According to the third embodiment described above, the UE can appropriately acquire the TPMI index based on the precoding matrix field.

[0174] <Fourth Embodiment>

[0175] The fourth embodiment relates to the correspondence between the antenna port field value for a single-layer PUSCH with transform precoding for 8-port transmission and information related to the DMRS used for the PUSCH.

[0176] The correspondence between the antenna port field value and the information related to the DMRS used for the single-layer PUSCH with transform precoding for 8-port transmission may be different between the case of using π / 2 BPSK modulation and the case of not using π / 2 BPSK modulation.

[0177] In addition, the correspondence between the antenna port field value and the information related to the DMRS used for the single-layer PUSCH with transform precoding for 8-port transmission may also be different according to the DMRS configuration for 8-port transmission. These DMRS configurations may also include, for example, at least one of the following:

[0178] -DMRS type = 1 and DMRS maximum length = 2;

[0179] -DMRS type = 1 and DMRS maximum length = 2 and doubled ports;

[0180] -Ports with DMRS type = 1 and DMRS maximum length = 1 and 2 times;

[0181] -DMRS type = 2 and DMRS maximum length = 2 and 2 times the port;

[0182] - DMRS type = 2 and DMRS maximum length = 1 and 2 times the port.

[0183] For example, the above correspondence relationship in the case of DMRS type = 1 and DMRS maximum length = 2 can be Figure 4C / Figure 4D It can also be a corresponding relationship based on this, or it can be a newly stipulated corresponding relationship.

[0184] Each entry in the newly defined correspondence relationship (DMRS-related information corresponding to one antenna port field value) indicates one DMRS port (and one n SCID ).

[0185] Figure 7 This is a diagram showing an example of the correspondence relationship between the value of the antenna port field and the information related to the DMRS in the fourth embodiment. Figure 7The corresponding relationship represents the case where the transform precoder is set to be valid, the DMRS type = 1 and the maximum length of the DMRS = 2 and 2 times the port, and π / 2 BPSK modulation is not used.

[0186] This example is equivalent to Figure 4C The corresponding relationship after adding the new entries shown in the figure to support double the number of ports. Figure 4C In the example, each DMRS symbol supports up to 4 DMRS ports, but in this example, each DMRS symbol supports up to 8 DMRS ports. Figure 4C In comparison, the size of the antenna port field is increased.

[0187] According to the fourth embodiment described above, the UE can appropriately acquire information related to the DMRS based on the antenna port field.

[0188] <Supplement>

[0189] In addition, the number "8" in the present disclosure can also be rewritten as any number greater than 4 (for example, 6, 10, 12, 16, ...), and can also be rewritten as any number less than 4 (for example, 1, 2, 3, 4). In addition, in the case of this rewriting, any number based on 8 in the above-mentioned embodiment can be appropriately rewritten. Anyone skilled in the art should be able to understand that this rewriting is recorded in the present disclosure. For example, when "8" is rewritten as "6", the 8-port i-layer PC precoder composed of 4 (or 6) rows of zero elements inserted into the existing 4 (or 2)-port PC / FC precoder can also be rewritten as a 6-port i-layer PC precoder composed of 2 (or 4) rows of zero elements inserted.

[0190] [Notification of information to UE]

[0191] The notification of any information (from the network (Newtwork (NW)) (for example, the base station (Base Station (BS)))) to the UE (in other words, the reception of any information from the BS in the UE) in the above-mentioned embodiment can also be carried out using physical layer signaling (for example, DCI), high-layer signaling (for example, RRC signaling, MAC CE), specific signals / channels (for example, PDCCH, PDSCH, reference signals), or a combination of these.

[0192] When the above notification is performed by MAC CE, the MAC CE is identified by including a new logical channel ID (Logical Channel ID (LCID)) not defined in the existing standard in the MAC subheader.

[0193] When the notification is performed through DCI, the notification may be performed through a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used in scrambling cyclic redundancy check (CRC) bits assigned to the DCI, the format of the DCI, etc.

[0194] In addition, notification of any information in the above-mentioned embodiments to the UE may be performed periodically, semi-continuously, or aperiodically.

[0195] [Notification of information from UE]

[0196] The notification of arbitrary information from the UE (to the NW) in the above-mentioned embodiment (in other words, the sending of arbitrary information from the UE to the BS) can also be performed through physical layer signaling (e.g., UCI), high-layer signaling (e.g., RRC signaling, MAC CE), specific signals / channels (e.g., PUCCH, PUSCH, PRACH, reference signals), or a combination of these.

[0197] When the above notification is performed through MAC CE, the MAC CE is identified by including a new LCID that is not specified in the existing standard in the MAC subheader.

[0198] When the above notification is performed through UCI, the above notification can also be sent using PUCCH or PUSCH.

[0199] In addition, the notification of arbitrary information from the UE in the above-mentioned embodiments may be performed periodically, semi-continuously, or aperiodically.

[0200] [About application of each embodiment]

[0201] At least one of the above-mentioned implementation modes may also be applied when a specific condition is met. The specific condition may be specified in the standard or may be notified to the UE / BC via high-layer signaling / physical layer signaling.

[0202] At least one of the above implementations may also be only for UE applications that report a specific UE capability (UE capability) or support the specific UE capability.

[0203] The specific UE capability may also represent at least one of the following:

[0204] - Supporting processing / operation / control / information for at least one of the above embodiments;

[0205] -Support PUSCH transmission using more than 4 antenna ports;

[0206] -Support 8-port m-layer NC / PC / FC precoder (m=1, 2, ...);

[0207] - Support 8-port PC precoder based on existing 2 / 4-port NC / PC / FC precoders (decision);

[0208] -Supports transform precoding for 8-port transmission.

[0209] In addition, the above-mentioned specific UE capabilities can be capabilities applied to the entire frequency band (commonly regardless of the frequency band), or capabilities for each frequency (for example, one or a combination of cells, bands, band combinations, BWPs, component carriers, etc.), or capabilities for each frequency range (for example, Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities for each subcarrier spacing (SubCarrier Spacing (SCS)), or capabilities for each feature set (Feature Set (FS)) or feature set of each component carrier (Feature Set Per Component-carrier (FSPC)).

[0210] Furthermore, the specific UE capability may be a capability applied across all duplex modes (commonly regardless of the duplex mode) or a capability for each duplex mode (eg, time division duplex (TDD) or frequency division duplex (FDD)).

[0211] In addition, at least one of the above-mentioned embodiments may also be applied when specific information associated with the above-mentioned embodiments is set / activated / triggered by the UE through high-layer signaling / physical layer signaling (or the operation of the above-mentioned embodiments is implemented). For example, the specific information may also be setting information for PUSCH using more than 4 antenna ports, information indicating a precoder determination / selection / judgment method using at least one of the above-mentioned embodiments, information indicating activation of a transform precoder for 8-port transmission, any RRC parameter for a specific version (e.g., Rel.18), etc.

[0212] In the case where at least one of the above-mentioned specific UE capabilities is not supported or the above-mentioned specific information is not set, the UE may also apply the operations of Rel.15 / 16, for example.

[0213] (Note)

[0214] The following inventions are added to one embodiment of the present disclosure.

[0215] [Note 1]

[0216] A terminal having:

[0217] a receiving unit, receiving information indicating activation of transform precoding for 8-port transmission; and

[0218] The control unit controls the 8-port transmission by applying the transform precoding.

[0219] [Note 2]

[0220] A terminal as described in Appendix 1, wherein:

[0221] The codebook representing the precoding matrix for the 8-port transmission is different from the codebook for the 8-port transmission without transform precoding.

[0222] [Note 3]

[0223] A terminal as described in Supplement 1 or Supplement 2, wherein:

[0224] The precoding information and the size of the layer number field included in the downlink control information for scheduling the 8-port transmission are associated with a codebook indicating the precoding matrix for the 8-port transmission.

[0225] [Note 4]

[0226] A terminal as described in any one of Notes 1 to 3, wherein:

[0227] The correspondence between the value of the antenna port field included in the downlink control information for scheduling the 8-port transmission and the information related to the demodulation reference signal (DeModulation Reference Signal (DMRS)) is different when π / 2 binary phase shift keying (BPSK) modulation is used and when π / 2 BPSK modulation is not used.

[0228] (Wireless Communication System)

[0229] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0230] Figure 81 is a diagram showing an example of a schematic structure of a wireless communication system involved in an embodiment. The wireless communication system 1 (which may also be simply referred to as the system 1) may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0231] In addition, the wireless communication system 1 may also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC may also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0232] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0233] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0234] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0235] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0236] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0237] 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.

[0238] Multiple base stations 10 may also be connected by wire (e.g., optical fiber based on Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0239] The base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0240] The core network 30 may also include, for example, user plane functions (User Plane Function (UPE)), access and mobility management function (Access and Mobility management Function (AMF)), session management function (Session Management Function (SMF)), unified data management (Unified Data Management (UDM)), application function (Application Function (AF)), data network (Data Network (DN)), location management function (Location Management Function (LMF)), maintenance and operation management (OAM) and other network functions (Network Functions (NF)). In addition, multiple functions can also be provided by one network node. In addition, communication with an external network (e.g., the Internet) can also be carried out via the DN.

[0241] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0242] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), 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), etc. may be used.

[0243] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0244] As downlink channels, the wireless communication system 1 may use 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.

[0245] In addition, as uplink channels, 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)), etc. can also be used in the wireless communication system 1.

[0246] User data, high-layer control information, System Information Block (SIB), etc. are transmitted through PDSCH. User data, high-layer control information, etc. can also be transmitted through PUSCH. In addition, Master Information Block (MIB) can also be transmitted through PBCH.

[0247] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0248] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be rewritten as DL data, and the PUSCH may also be rewritten as UL data.

[0249] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0250] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be rewritten mutually.

[0251] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted through PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted through PRACH.

[0252] In the present disclosure, downlink, uplink, etc. may be expressed without “link.” In addition, various channels may be expressed without “Physical” at the beginning.

[0253] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As DL-RS, in the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0254] 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 SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as SS / PBCH block, SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0255] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may also be transmitted. In addition, DMRS may also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0256] (Base Station)

[0257] Fig. 9 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0258] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0259] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0260] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0261] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0262] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0263] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0264] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0265] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0266] The sending and receiving unit 120 (sending processing unit 1211), for example, may also 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 the data, control information, etc. obtained from the control unit 110, to generate a bit string to be sent.

[0267] The transmitting and receiving unit 120 (transmitting processing unit 1211) may also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (DFT) processing (as needed), inverse fast Fourier transform (IFFT) processing), precoding, digital-to-analog conversion and other transmission processing on the bit string to be transmitted, and output a baseband signal.

[0268] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0269] On the other hand, the transmission and reception unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmission and reception antenna 130 .

[0270] The transmitting and receiving unit 120 (receiving processing unit 1212) may also apply receiving processing such as analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing (filtering processing), demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0271] The transmitting and receiving unit 120 (the measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also 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 also be output to the control unit 110.

[0272] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30 (for example, a network node providing NF), other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0273] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0274] In addition, the transmitting and receiving unit 120 may transmit information indicating activation of transform precoding for 8-port transmission to the user terminal 20. The transmitting and receiving unit 120 may also receive the 8-port transmission to which transform precoding is applied.

[0275] (User terminal)

[0276] Fig.10 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. In addition, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided in one or more portions.

[0277] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0278] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0279] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0280] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0281] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0282] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0283] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0284] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0285] The sending and receiving unit 220 (sending processing unit 2211) may also perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0286] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0287] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0288] The transmitting and receiving unit 220 (RF unit 222 ) may perform modulation, filter processing (filtering processing), amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0289] On the other hand, the transmission and reception unit 220 (RF unit 222 ) may perform amplification, filter processing (filter processing), demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmission and reception antenna 230 .

[0290] The sending and receiving unit 220 (receiving processing unit 2212) can also apply receiving processing such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing (filtering processing), demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0291] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurement, CSI measurement, etc. based on the received signal. The measuring unit 223 may also measure the received power (e.g., RSRP), the received quality (e.g., RSRQ, SINR, SNR), the signal strength (e.g., RSSI), the propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0292] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0293] In addition, the transmission and reception unit 220 receives information indicating activation of transform precoding for 8-port transmission. The control unit 210 may also control the 8-port transmission to be performed by applying transform precoding.

[0294] The codebook representing the precoding matrix for the 8-port transmission may be different from the codebook for the 8-port transmission without transform precoding.

[0295] The precoding information and the size of the layer number field included in the downlink control information for scheduling the 8-port transmission may be associated with a codebook indicating the precoding matrix for the 8-port transmission.

[0296] The correspondence between the value of the antenna port field included in the downlink control information for scheduling the 8-port transmission and the information related to the demodulation reference signal (DeModulation Reference Signal (DMRS)) may be different in the case of using π / 2 binary phase shift keying (BPSK) modulation and in the case of not using π / 2 BPSK modulation.

[0297] (Hardware structure)

[0298] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, by wire, wireless, etc.) and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0299] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method thereof is not particularly limited.

[0300] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.11 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0301] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, and unit can be interchanged. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0302] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0303] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0304] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the control unit 110 (210), the transmission and reception unit 120 (220), etc. described above may also be implemented by the processor 1001.

[0305] In addition, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the other functional blocks can also be implemented in the same way.

[0306] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0307] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0308] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0309] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that performs output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0310] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0311] In addition, the base station 10 and the user terminal 20 may also 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), and a field programmable gate array (FPGA), and the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0312] (Variation)

[0313] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may be rewritten one another. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0314] A radio frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0315] Here, the parameter set may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of the subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, wireless frame structure, specific filter processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, etc.

[0316] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0317] A time slot may also contain multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of a smaller number of symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0318] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be replaced with each other.

[0319] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a 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. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0320] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0321] TTI can also be a transmission time unit for a data packet (transport block), code block, code word, etc. that has been channel-coded, and can also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (for example, the number of symbols) to which a transport block, code block, code word, etc. is actually mapped can also be shorter than the TTI.

[0322] In addition, when a time slot or a mini time slot is called a TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) may also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling may also be controlled.

[0323] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0324] In addition, a long TTI (eg, normal TTI, subframe, etc.) may be rewritten as a TTI having a time length exceeding 1 ms, and a short TTI (eg, shortened TTI, etc.) may be rewritten as a TTI having a TTI length shorter than that of a long TTI and longer than 1 ms.

[0325] Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and may also include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0326] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0327] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0328] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0329] Bandwidth Part (BWP) (also referred to as partial bandwidth, etc.) can also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, common RBs can also be identified by the index of the RB based on the common reference point of the carrier. PRBs can also be defined in a BWP and numbered within the BWP.

[0330] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0331] At least one of the set BWPs may be activated, and the UE may not assume that a specific signal / channel is transmitted or received outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0332] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0333] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0334] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0335] Information, signals, etc. described in the present disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0336] In addition, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0337] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or added. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0338] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0339] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0340] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0341] The determination may be made using a value represented by one bit (0 or 1), a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(eg, comparison with a specific value).

[0342] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software module, application, software application, software package, routine, sub-routine, object, executable files, execution thread, procedure, function, etc.

[0343] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when the software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0344] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0345] 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", and "panel" can be used interchangeably.

[0346] In the present disclosure, terms such as "base station (BS)", "wireless 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", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro cell, and pico cell.

[0347] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0348] In the present disclosure, the base station sending information to the terminal may also be rewritten as the base station instructing the terminal to control / operate based on the information.

[0349] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0350] 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, hand set, user agent, mobile client, client or several other appropriate terms.

[0351] At least one of the base station and the mobile station may also be referred to as a transmission device, a reception device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a moving object, a moving object body, etc.

[0352] The mobile body refers to a movable object, and the moving speed is arbitrary, and of course it also includes the situation where the mobile body stops. The mobile body includes, for example, vehicles, transport vehicles, cars, automatic two-wheeled vehicles (motorcycles), bicycles, connected cars, loading shovels, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, trolleys, rickshaws, ships (ships and other watercrafts), airplanes, rockets, artificial satellites, drones, multi-rotor aircraft, quadcopters, balloons and objects carried on them, but are not limited to these. In addition, the mobile body can also be a mobile body that drives autonomously based on operating instructions.

[0353] The mobile object may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile object that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station may include a device that does not necessarily move when performing communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0354] Fig.12 1 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, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed 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.

[0355] The driving unit 41 is composed of at least one of an engine, a motor, or a combination of an engine and a motor. The steering unit 42 is composed of at least a steering wheel (also called a handlebar), and steers at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0356] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be referred to as an ECU (Electronic Control Unit).

[0357] The signals from the various sensors 50-58 include a current signal from a current sensor 50 for sensing the current of the motor, a speed signal of the front wheels 46 / rear wheels 47 obtained by a 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, a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58, and the like.

[0358] The information service unit 59 is composed of various devices such as a vehicle navigation system, an audio system, a speaker, 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 obtained from an external device via the communication module 60 and the like to provide various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0359] The information service unit 59 may include input devices for accepting input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.), and may also include output devices for implementing output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0360] The driving assistance system unit 64 is composed of various devices for providing functions for preventing accidents or reducing the driving load of the driver, such as millimeter wave radar, light detection and ranging (LiDAR), camera, positioning locator (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., high-precision (High Definition (HD))) map, autonomous vehicle (Autonomous Vehicle (AV)) map, etc.), gyroscope system (e.g., inertial measurement unit (Inertial Measurement Unit (IMU)), inertial navigation unit (Inertial Navigation System (INS)), etc.), artificial intelligence (Artificial Intelligence (AI)) chip, AI processor, and one or more ECUs for controlling these devices. In addition, the driving assistance system unit 64 sends and receives various information via the communication module 60 and realizes the driving assistance function or the autonomous driving function.

[0361] The communication module 60 can communicate with the microprocessor 61 and the components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) between the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the microprocessor 61 and the memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58 provided in the vehicle 40 via the communication port 63.

[0362] The communication module 60 can be controlled by the microprocessor 61 of the electronic control unit 49, and is a communication device that can communicate with an external device. For example, various information is sent and received with the external device via wireless communication. The communication module 60 can be located either inside or outside the electronic control unit 49. The external device can also be, for example, the above-mentioned base station 10, user terminal 20, etc. In addition, the communication module 60 can also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it can also function as at least one of the base station 10 and user terminal 20).

[0363] The communication module 60 may also transmit at least one of the signals from the 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 also be referred to as an input unit that receives input. For example, the PUSCH transmitted through the communication module 60 may also include information based on the above input.

[0364] The communication module 60 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) transmitted from an external device, and displays it to the information service unit 59 provided in the vehicle. The information service unit 59 may also be referred to as an output unit for outputting information (for example, outputting information to a display, a speaker, etc. based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0365] In addition, the communication module 60 stores various information received from the external device in the memory 62 that can be used by the microprocessor 61. The microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, and various sensors 50-58 of the vehicle 40 based on the information stored in the memory 62.

[0366] In addition, the base station in the present disclosure may also be rewritten as a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be rewritten as terms corresponding to inter-terminal communication (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may also be rewritten as sidelink channels.

[0367] Likewise, the user terminal in the present disclosure may be rewritten as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0368] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0369] The various methods / implementations described in this disclosure may be used alone or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, timings, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the method described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0370] The various modes / implementations described in the present disclosure may be applied to 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 a decimal)), 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 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these enhancements, revisions, productions, or regulations. In addition, multiple systems may be combined (for example, LTE or LTE-A, combination with 5G, etc.) for application.

[0371] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0372] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0373] The term "determining" used in this disclosure may include a variety of actions. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0374] In addition, “judgment (decision)” may also refer to situations where receiving (e.g., receiving information), transmitting (e.g., sending information), input (input), output (output), accessing (e.g., accessing data in a memory), etc. are regarded as making a “judgment (decision)”.

[0375] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as "judgment (decision)". That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as "judgment (decision)".

[0376] In addition, "judge (decide)" can also be rewritten as "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0377] The “maximum transmit power” described in the present disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated maximum transmit power).

[0378] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be rewritten as "access".

[0379] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0380] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same manner as "different".

[0381] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0382] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0383] In the present disclosure, "below", "less than", "above", "more than", "equal to", etc. can also be rewritten with each other. In addition, in the present disclosure, sentences meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. can also be rewritten with each other, without being limited to the original degree, comparative degree, and superlative degree. In addition, in the present disclosure, sentences meaning "good", "bad", "big", "small", "high", "low", "early", "late", "wide", "narrow", etc. can also be rewritten with each other as expressions attached with "ith" (i is an arbitrary integer) without being limited to the original degree, comparative degree, and superlative degree (for example, "highest" can also be rewritten with "i-th highest").

[0384] In the present disclosure, “of,” “for,” “regarding,” “related to,” “associated with,” etc. may also be replaced by each other.

[0385] The invention involved in the present disclosure is described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: a receiving unit, receiving information indicating activation of transform precoding for 8-port transmission; and The control unit controls the 8-port transmission by applying the transform precoding.

2. The terminal according to claim 1, wherein: The codebook representing the precoding matrix for the 8-port transmission is different from the codebook for the 8-port transmission without transform precoding.

3. The terminal according to claim 1, wherein: The precoding information and the size of the layer number field included in the downlink control information for scheduling the 8-port transmission are associated with a codebook indicating the precoding matrix for the 8-port transmission.

4. The terminal according to claim 1, wherein: The correspondence between the value of the antenna port field included in the downlink control information for scheduling the 8-port transmission and the information related to the demodulation reference signal DMRS is different when π / 2 binary phase shift keying BPSK modulation is used and when π / 2 BPSK modulation is not used.

5. A wireless communication method of a terminal, comprising: receiving information indicating activation of transform precoding for 8-port transmission; and A step of controlling the 8-port transmission by applying transform precoding.

6. A base station, comprising: a sending unit, sending information indicating activation of transform precoding for 8-port transmission to the terminal; and The receiving unit receives the 8-port transmission transmitted by using transform precoding.

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