Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is characterized by being provided with: a reception unit that receives an antenna port instruction when at least one of a set demodulation reference signal (DMRS) type and a maximum length of the DMRS is not 1; and a control unit that, on the basis of the antenna port instruction, controls uplink (UL) transmissions corresponding to two codewords and uses the UL transmissions having a number of layers greater than 4. According to one embodiment of the present disclosure, UL transmission in which the number of layers is greater than 4 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 Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) is standardized for the purpose of further increasing the capacity and sophistication of LTE (Release (Rel.) 8, 9 of the Third Generation Partnership Project (3GPP)).

[0003] Successor systems of LTE (also known as, for example, 5th generation mobile communication system (5G), 5G+(plus), 6th 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.15NR, up to 4 layers of uplink (UL) multi-input multi-output (MIMO) transmission are supported. In future wireless communication systems, the terminals (user terminals, user equipment (UE)) are being studied to support UL transmission with more than 4 layers in order to achieve higher spectrum efficiency.

[0009] However, research has not yet progressed on how the network can understand the antenna structure of the UE and how to make the UE perform the UL transmission for UL transmission with a number of layers greater than 4. If this control is not clarified, there is a concern that the increase in communication throughput will be suppressed.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately control UL transmission with a layer number greater than 4.

[0011] Means for solving problems

[0012] A terminal involved in one method of the present disclosure is characterized in that it has: a receiving unit that receives an antenna port indication when at least one of a set demodulation reference signal (DeModulation Reference Signal (DMRS)) type and a maximum length of the DMRS is not 1; and a control unit that controls an uplink (UL) transmission corresponding to two codewords and uses the UL transmission with a number of layers greater than 4 based on the antenna port indication.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, UL transmission with a layer number greater than 4 can be appropriately controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A-Figure 1D This is a diagram showing an example of a table of reference antenna ports when the transform precoder is invalid, the DMRS type=1, and the maximum length of the DMRS=1 in Rel.15.

[0016] Figure 2A-2D This is a diagram showing an example of a table of reference antenna ports when the transform precoder is invalid, the DMRS type=1, and the maximum length of the DMRS=2 in Rel.15.

[0017] Figure 3A-3D This is a diagram showing an example of a table of reference antenna ports when the transform precoder is invalid, the DMRS type=2, and the maximum length of the DMRS=1 in Rel.15.

[0018] Figure 4A , Figure 4B This is a diagram showing an example of a table of reference antenna ports when the transform precoder is invalid, the DMRS type=2, and the maximum length of the DMRS=2 in Rel.15.

[0019] Figure 5A , Figure 5B This is a diagram showing an example of a table of reference antenna ports when the transform precoder is invalid, the DMRS type=2, and the maximum length of the DMRS=2 in Rel.15.

[0020] Figure 6A-6D This is a diagram showing an example of a table of reference antenna ports when the transform precoder is invalid, the DMRS type=1, and the maximum length of the DMRS=2.

[0021] Fig. 7A as well as Figure 7B This is a diagram showing an example of a table of reference antenna ports when the transform precoder is invalid, the DMRS type=2, and the maximum length of the DMRS=1.

[0022] Figure 8A-8D This is a diagram showing an example of a table of reference antenna ports when the transform precoder is invalid, the DMRS type=2, and the maximum length of the DMRS=2.

[0023] Fig. 9 This is a flowchart showing an example of the processing of the third embodiment.

[0024] Fig.10 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0025] Fig.11 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0026] Fig.12 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0027] Fig.13 This is a diagram showing an example of the hardware configuration of a base station and a user terminal involved in one embodiment.

[0028] Fig.14 This is a diagram showing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

[0029] (Control of SRS and PUSCH Transmission)

[0030] In Rel.15NR, the UE can also receive information (SRS setting information, such as parameters in the "SRS-Config" of the RRC control element) used in the transmission of a measurement reference signal (e.g., a sounding reference signal (SRS)).

[0031] 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, "SRS-ResourceSet" of the RRC control element) and information related to one or more SRS resources (SRS resource information, for example, "SRS-Resource" of the RRC control element).

[0032] One SRS resource set may be associated with a specific number of SRS resources (or the specific number of SRS resources may be grouped). Each SRS resource may be identified by an SRS resource identifier (SRS Resource Indicator (SRI)) or an SRS resource ID (Identifier).

[0033] 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.

[0034] Here, the SRS resource type may also represent any one of periodic SRS (Periodic SRS (P-SRS)), semi-persistent SRS (Semi-Persistent SRS (SP-SRS)), and aperiodic CSI (Aperiodic SRS (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.

[0035] 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 (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.

[0036] For example, in the case of codebook-based transmission, the UE may also determine the precoder 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.

[0037] 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 code elements, SRS bandwidth, etc.), jump association information, SRS resource type, sequence ID, SRS spatial relationship information, etc.

[0038] The spatial relationship information of SRS (for example, "spatialRelationInfo" of RRC information element) 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 (Channel State Information Reference Signal (CSI-RS)), and an SRS (for example, other SRS). The SS / PBCH block may also be referred to as a synchronization signal block (SSB).

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] When spatial relationship information related to other SRS (reference SRS) and the SRS (target SRS) is set for a certain SRS (target SRS) resource, the UE may also use the same spatial domain filter (spatial domain transmission filter) as the spatial domain filter (spatial domain transmission filter) used for transmitting the reference SRS to transmit the target SRS resource. That is, in this case, the UE may also assume that the UE transmission beam of the reference SRS is the same as the UE transmission beam of the target SRS.

[0044] 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 of the SRS resource determined based on the value of the specific field (e.g., SRI) (e.g., "spatialRelationInfo" of the RRC information element) for PUSCH transmission.

[0045] In Rel.15 / 16NR, when codebook-based transmission is used for PUSCH, the UE may also be configured with an SRS resource set with a maximum of two SRS resources for the purpose of the codebook through RRC, and may also be indicated one of the maximum two SRS resources through DCI (1-bit SRI field). The transmit beam of PUSCH is specified by the SRI field.

[0046] 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 based on the TPMI, the number of layers, etc. from the uplink codebook for the same number of ports as the number of SRS ports indicated by "nrofSRS-Ports" of the high-level parameter, wherein the high-level parameter is a high-level parameter set for the SRS resource specified by the SRI field.

[0047] In Rel.15 / 16NR, 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 can also be indicated with one or more of the maximum 4 SRS resources through DCI (2-bit SRI field).

[0048] The UE may also determine the number of layers (transmission rank) used for 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 PUSCH. In addition, the UE may also calculate the precoder of the SRS resource.

[0049] When the CSI-RS associated with the SRS resource (or the SRS resource set to which the SRS resource belongs) (also referred to as the associated CSI-RS) is set in the upper 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.

[0050] In addition, the UE may also be configured to use codebook-based PUSCH transmission or non-codebook-based PUSCH transmission through a high-layer parameter "txConfig" indicating a transmission scheme. This parameter may also indicate a value of "codebook" or "non-codebook".

[0051] In the present disclosure, codebook-based PUSCH (codebook-based PUSCH transmission, codebook-based transmission) may also mean PUSCH in which "codebook" is set as a transmission scheme in the UE. In the present disclosure, non-codebook-based PUSCH (non-codebook-based PUSCH transmission, non-codebook-based transmission) may also mean PUSCH in which "non-codebook" is set as a transmission scheme in the UE.

[0052] (DMRS)

[0053] Front-loaded DMRS is the initial (first symbol or symbol near the first symbol) DMRS used for earlier demodulation. Additional DMRS can be set by RRC for high-speed mobile UE or high modulation and coding scheme (MCS) / rank. The frequency position of additional DMRS is the same as that of front-loaded DMRS.

[0054] For the time domain, DMRS mapping type A or B is set. In DMRS mapping type A, DMRS position l_0 is counted by the codeword index in the time slot. l_0 is set by the parameter (dmrs-TypeA-Position) in the MIB or the public service cell setting (ServingCellConfigCommon). DMRS position 0 (reference point l) means the first codeword of the time slot or each hop. In DMRS mapping type B, DMRS position l_0 is counted by the codeword index in the PDSCH / PUSCH. l_0 is always 0. DMRS position 0 (reference point l) means the first codeword of the PDSCH / PUSCH or each hop.

[0055] The DMRS position is defined by a table in the specification and depends on the duration of the PDSCH / PUSCH. The position of the additional DMRS is fixed.

[0056] For the frequency domain, (PDSCH / PUSCH) DMRS setting type 1 or 2 is set. DMRS setting type 1 has a comb structure and can be applied to both CP-OFDM (transmission precoding = disabled) and DFT-S-OFDM (transmission precoding = enabled). DMRS setting type 2 can only be applied to CP-OFDM.

[0057] Single-symbol DMRS or double-symbol DMRS is set.

[0058] Single-symbol DMRS is usually used (it is a required function (mandatory) in Rel.15). In single-symbol DMRS, the number of additional DMRS (symbols) is {0, 1, 2, 3}. Single-symbol DMRS supports both cases where frequency hopping is valid and invalid. Single-symbol DMRS is used when the maximum number (maxLength) in the uplink DMRS configuration (DMRS-UplinkConfig) is not set.

[0059] Dual-symbol DMRS is used for more DMRS ports (especially MU-MIMO). In dual-symbol DMRS, the number of additional DMRS (symbols) is {0,1}. Dual-symbol DMRS supports situations where frequency hopping is invalid. When the maximum number (maxLength) in the uplink DMRS configuration (DMRS-UplinkConfig) is 2 (len2), the decision of whether to use single-symbol DMRS or dual-symbol DMRS is made by DCI or configured grant.

[0060] Based on the above, possible configuration patterns of DMRS may include the following combinations.

[0061] DMRS configuration type 1, DMRS mapping type A, single symbol DMRS

[0062] DMRS configuration type 1, DMRS mapping type A, dual-symbol DMRS

[0063] DMRS configuration type 1, DMRS mapping type B, single symbol DMRS

[0064] DMRS setting type 1, DMRS mapping type B, dual-symbol DMRS

[0065] DMRS configuration type 2, DMRS mapping type A, single symbol DMRS

[0066] DMRS setting type 2, DMRS mapping type A, dual-symbol DMRS

[0067] DMRS configuration type 2, DMRS mapping type B, single symbol DMRS

[0068] DMRS setting type 2, DMRS mapping type B, dual-symbol DMRS

[0069] A plurality of DMRS ports mapped to the same RE (time and frequency resource) is called a DMRS CDM group.

[0070] For DMRS configuration type 1 and single-symbol DMRS, 4 DMRS ports can be used. In each DMRS CDM group, 2 DMRS ports are multiplexed by FD OCC of length 2. Between multiple DMRS CDM groups (2 DMRS CDM groups), 2 DMRS ports are multiplexed by FDM.

[0071] For DMRS setting type 1 and dual-symbol DMRS, 8 DMRS ports can be used. In each DMRS CDM group, 2 DMRS ports are multiplexed through FD OCC of length 2, and 2 DMRS ports are multiplexed through TD OCC. Between multiple DMRS CDM groups (2 DMRS CDM groups), 2 DMRS ports are multiplexed through FDM.

[0072] For DMRS configuration type 2 and single-symbol DMRS, 6 DMRS ports can be used. In each DMRS CDM group, 2 DMRS ports are multiplexed by FD OCC of length 2. Between multiple DMRS CDM groups (3 DMRS CDM groups), 3 DMRS ports are multiplexed by FDM.

[0073] For DMRS setting type 2 and dual-symbol DMRS, 12 DMRS ports can be used. In each DMRS CDM group, 2 DMRS ports are multiplexed through FD OCC of length 2, and 2 DMRS ports are multiplexed through TD OCC. Between multiple DMRS CDM groups (3 DMRS CDM groups), 3 DMRS ports are multiplexed through FDM.

[0074] Here, an example of DMRS mapping type B is shown, but DMRS mapping type A is also the same.

[0075] Among the parameters for PDSCH DMRS, for DMRS configuration type 1, DMRS ports 1000 to 1007 can be used, and for DMRS configuration type 2, DMRS ports 1000 to 1011 can be used.

[0076] Among the parameters for PUSCH DMRS, for DMRS configuration type 1, DMRS ports 0 to 7 can be used, and for DMRS configuration type 2, DMRS ports 0 to 11 can be used.

[0077] (Port of reference signal)

[0078] For the purpose of orthogonalization of the MIMO layer, reference signals of multiple ports (for example, a demodulation reference signal (DMRS) or CSI-RS) are used.

[0079] For example, for Single User MIMO (SU-MIMO), different DMRS ports / CSI-RS ports may be set for each layer. For Multi User MIMO (MU-MIMO), different DMRS ports / CSI-RS ports may be set for each layer within a UE and for each UE.

[0080] In addition, if a CSI-RS port number greater than the number of layers used in the data is used, it is expected that more accurate channel state measurement can be performed based on the CSI-RS, which can contribute to improvement in throughput.

[0081] In Rel-15 NR, regarding DMRS of multiple ports, by using frequency division multiplexing (FDM), frequency domain orthogonal cover code (FD-OCC), time domain OCC (TD-OCC), etc., if it is type 1 DMRS (in other words, DMRS setting type 1), it supports a maximum of 8 ports, and if it is type 2 DMRS (in other words, DMRS setting type 2), it supports a maximum of 12 ports.

[0082] In Rel-15 NR, a comb-shaped transmission frequency pattern (comb-shaped resource set) is used as the above-mentioned FDM. Cyclic Shift (CS) is used as the above-mentioned FD-OCC. In addition, the above-mentioned TD-OCC can be applied only to dual-symbol DMRS.

[0083] The OCC disclosed in the present invention may also be interchangeable with orthogonal codes, orthogonalization, cyclic shift, etc.

[0084] In addition, the type of DMRS may also be referred to as a DMRS Configuration type.

[0085] Among DMRSs, a DMRS that performs resource mapping in units of two consecutive (adjacent) symbols may also be referred to as a dual-symbol DMRS, and a DMRS that performs resource mapping in units of one symbol may also be referred to as a single-symbol DMRS.

[0086] Regardless of which DMRS is used, it can be mapped to more than one codeword for each time slot according to the length of the data channel. The DMRS mapped to the starting position of the data codeword can also be called the front-loaded DMRS, and the DMRS mapped to other positions can also be called the additional DMRS.

[0087] In the case of DMRS configuration type 1 and single-symbol DMRS, Comb and CS may also be used for orthogonalization. For example, two types of Combs and two types of CS (Comb2+2CS) may be used to support a maximum of four antenna ports (APs).

[0088] In the case of DMRS type 1 and dual-symbol DMRS, Comb, CS, and TD-OCC can also be used for orthogonalization. For example, two types of Comb, two types of CS, and TD-OCC ({1,1} and {1,-1}) can also be used to support up to 8 APs.

[0089] In the case of DMRS type 2 and single-symbol DMRS, FD-OCC can also be used for orthogonalization. For example, orthogonal codes (2-FD-OCC) can be applied to two resource elements (REs) that are adjacent in the frequency direction to support up to 6 APs.

[0090] In the case of DMRS type 2 and dual-symbol DMRS, FD-OCC and TD-OCC can also be used for orthogonalization. For example, up to 12 APs can be supported by applying an orthogonal code (2-FD-OCC) to two adjacent REs in the frequency direction and applying TD-OCC ({1,1} and {1,-1}) to two adjacent REs in the time direction.

[0091] In addition, in Rel-15 NR, for CSI-RS of multiple ports, a maximum of 32 ports are supported by using FDM, time division multiplexing (TDM), frequency domain OCC, time domain OCC, etc. For orthogonalization of CSI-RS, the same method as the above-mentioned DMRS can also be applied.

[0092] In addition, a group of DMRS ports orthogonalized by FD-OCC / TD-OCC as described above is also called a code division multiplexing (CDM) group.

[0093] Different CDM groups are orthogonal because they are FDMed. On the other hand, within the same CDM group, the orthogonality of the OCC applied may be destroyed due to channel changes, etc. In this case, if the signals within the same CDM group are received at different receiving powers, a near-far problem will occur, and there is a concern that orthogonality cannot be ensured.

[0094] Here, the TD-OCC / FD-OCC of the DMRS of Rel.15NR is described. The DMRS mapped to the resource element (RE) may also be equivalent to multiplying the DMRS sequence by the parameter (also referred to as sequence element, etc.) w of the FD-OCC. f (k') and TD-OCC parameters (also called sequence elements, etc.) w t (l') obtained.

[0095] The TD-OCC and FD-OCC of the DMRS of Rel.15NR are both equivalent to OCC with a sequence length (also called OCC length) = 2. Therefore, the possible values ​​of k' and l' are both 0 and 1. By multiplying the FD-OCC by RE, the DMRS of 2 ports can be multiplexed using the same time and frequency resources (2RE). If both the FD-OCC and TD-OCC are applied, the DMRS of 4 ports can be multiplexed using the same time and frequency resources (4RE).

[0096] The two existing DMRS port tables for PDSCH described above correspond to DMRS configuration type 1 and type 2. In addition, p represents the number of the antenna port, and Δ represents a parameter for shifting (offsetting) the frequency resource.

[0097] For example, for antenna ports 1000 and 1001, {w f (0), w f (1)}={+1,+1} and {w f (0), w f (1)}={+1,-1}, and thus orthogonalized using FD-OCC.

[0098] FDM is applied by applying Δ of different values ​​to antenna ports 1000-1001 and antenna ports 1002-1003 (and further to antenna ports 1004-1005 in the case of type 2). Therefore, antenna ports 1000-1003 (or 1000-1005) corresponding to single-symbol DMRS are orthogonalized using FD-OCC and FDM.

[0099] For type 1 antenna ports 1000-1003 and antenna ports 1004-1007, {w t (0), w t (1)}={+1,+1} and {w t (0), w t (1)}={+1,-1}, and thus, the antenna ports 1000-1007 (or 1000-1011) corresponding to the dual-symbol DMRS are orthogonalized using FD-OCC, TD-OCC, and FDM.

[0100] Under study: For CP-OFDM only, a larger number of orthogonal DMRS ports for DL / UL MU-MIMO are specified (without increasing DMRS overhead), and a common design is made between DL and UL DMRS, with a maximum of 24 orthogonal DMRS ports. For each applicable DMRS setting type, the maximum number of orthogonal DMRS ports is doubled for both single-symbol DMRS and double-symbol DMRS.

[0101] In Rel. 15, the following cases 1 to 4 can be set.

[0102] [Case 1] Single-symbol DMRS of DMRS configuration type 1

[0103] The total number of DMRS ports is (comb / FDM based) 2×(FD OCC based) 2=4 ports.

[0104] [Case 2] Dual-symbol DMRS of DMRS configuration type 1

[0105] The total number of DMRS ports is (comb / FDM-based) 2×(FD OCC-based) 2×(TD OCC-based) 2=8 ports.

[0106] [Case 3] Single-symbol DMRS of DMRS configuration type 2

[0107] The total number of DMRS ports is 3 (based on FDM) x 2 (based on FD OCC) = 6 ports.

[0108] [Case 4] Dual-symbol DMRS of DMRS configuration type 2

[0109] The total number of DMRS ports is (comb-based) 3×(FD OCC-based) 2×(TD OCC-based) 2=12 ports.

[0110] In addition, in Case 1 to Case 4 of Rel. 15, the mapping of the CDM group and the DMRS port index is as follows.

[0111] [Scenario 1]

[0112] It is also possible to use 4 ports and 2 CDM groups. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1}, and CDM group #1 may correspond to DMRS port index {2,3}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000,1001}, and CDM group #1 may correspond to DMRS port index {1002,1003}.

[0113] [Scenario 2]

[0114] It is also possible to use 8 ports and 2 CDM groups. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1,4,5}, and CDM group #1 may correspond to DMRS port index {2,3,6,7}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000,1001,1004,1005}, and CDM group #1 may correspond to DMRS port index {1002,1003,1006,1007}.

[0115] [Scenario 3]

[0116] It is also possible to use 6 ports and 3 CDM groups. For PUSCH, CDM group #0 may correspond to DMRS port index {0,1}, CDM group #1 may correspond to DMRS port index {2,3}, and CDM group #2 may correspond to DMRS port index {4,5}. For PDSCH, CDM group #0 may correspond to DMRS port index {1000,1001}, CDM group #1 may correspond to DMRS port index {1002,1003}, and CDM group #2 may correspond to DMRS port index {1004,1005}.

[0117] [Case 4]

[0118] It is also possible to use a 12-port, 3CDM group. For PUSCH, CDM group #0 can also correspond to DMRS port indices {0, 1, 6, 7}, CDM group #1 can also correspond to DMRS port indices {2, 3, 8, 9}, and CDM group #2 can also correspond to DMRS port indices {4, 5, 10, 11}. For PDSCH, CDM group #0 can also correspond to DMRS port indices {1000, 1001, 1006, 1007}, CDM group #1 can also correspond to DMRS port indices {1002, 1003, 1008, 1009}, and CDM group #2 can also correspond to DMRS port indices {1004, 1005, 1010, 1011}.

[0119] <Table of Antenna Ports in Rel. 15>

[0120] Figure 1A-Figure 1D It is a diagram showing an example of a table of reference antenna ports in the case where the transform precoder in Rel. 15 is invalid, DMRS type = 1, and the maximum length of DMRS = 1.

[0121] Figure 1A It is an example of a table of antenna ports corresponding to rank 1. In this example, for values of the antenna port field = 0 to 5, different sets of DMRS ports (number of antenna ports 1) are respectively associated.

[0122] Figure 1B It is an example of a table of antenna ports corresponding to rank 2. In this example, for values of the antenna port field = 0 to 3, different sets of DMRS ports (number of antenna ports 2) are respectively associated.

[0123] Figure 1C It is an example of a table of antenna ports corresponding to rank 3. In this example, for the value of the antenna port field = 0, different sets of DMRS ports (number of antenna ports 3) are respectively associated.

[0124] Figure 1D It is an example of a table of antenna ports corresponding to rank 4. In this example, for the value of the antenna port field = 0, different sets of DMRS ports (number of antenna ports 4) are respectively associated.

[0125] Figure 2A-2D It is a diagram showing an example of a table of reference antenna ports in the case where the transform precoder in Rel. 15 is invalid, DMRS type = 1, and the maximum length of DMRS = 2.

[0126] Figure 2AThis is an example of a table of antenna ports corresponding to rank 1. In this example, different sets of DMRS ports (antenna port number 1) are associated with the values ​​of the antenna port field = 0 to 13. In addition, the correspondence between the value and the content of the entry is not limited to this. The same is true for other examples.

[0127] Figure 2B This is an example of a table of antenna ports corresponding to rank 2. In this example, different sets of DMRS ports (the number of antenna ports is 2) are associated with the values ​​of the antenna port field = 0 to 9, respectively.

[0128] Figure 2C This is an example of a table of antenna ports corresponding to rank 3. In this example, different sets of DMRS ports (the number of antenna ports is 3) are associated with the values ​​of the antenna port field = 0 to 2, respectively.

[0129] Figure 2D This is an example of a table of antenna ports corresponding to rank 4. In this example, different sets of DMRS ports (the number of antenna ports is 4) are associated with the values ​​of the antenna port field from 0 to 3, respectively.

[0130] Figure 3A-3D This is a diagram showing an example of a table of reference antenna ports when the transform precoder is invalid, the DMRS type=2, and the maximum length of the DMRS=1 in Rel.15.

[0131] Figure 3A This is an example of a table of antenna ports corresponding to rank 1. In this example, the values ​​of the antenna port field = 0 to 11 are respectively associated with different sets of DMRS ports (antenna port number 1). In addition, the correspondence between the value and the content of the entry is not limited to this. The same is true for other examples.

[0132] Figure 3B This is an example of a table of antenna ports corresponding to rank 2. In this example, different sets of DMRS ports (the number of antenna ports is 2) are associated with the values ​​of the antenna port field = 0 to 6, respectively.

[0133] Figure 3C This is an example of a table of antenna ports corresponding to rank 3. In this example, different sets of DMRS ports (the number of antenna ports is 3) are associated with the values ​​of the antenna port field = 0 to 2, respectively.

[0134] Figure 3D This is an example of a table of antenna ports corresponding to rank 4. In this example, different sets of DMRS ports (the number of antenna ports is 4) are associated with the values ​​of the antenna port field from 0 to 1, respectively.

[0135] Figure 4A , Figure 4B, Figure 5A , Figure 5B This is a diagram showing an example of a table of reference antenna ports when the transform precoder is invalid, the DMRS type=2, and the maximum length of the DMRS=2 in Rel.15.

[0136] Figure 4A This is an example of a table of antenna ports corresponding to rank 1. In this example, different sets of DMRS ports (number of antenna ports 1) are associated with the values ​​of the antenna port field = 0 to 27.

[0137] Figure 4B This is an example of a table of antenna ports corresponding to rank 2. In this example, different sets of DMRS ports (the number of antenna ports is 2) are associated with the values ​​of the antenna port field = 0 to 18, respectively.

[0138] Figure 5A This is an example of a table of antenna ports corresponding to rank 3. In this example, different sets of DMRS ports (the number of antenna ports is 3) are associated with the values ​​of the antenna port field = 0 to 5, respectively.

[0139] Figure 5B This is an example of a table of antenna ports corresponding to rank 4. In this example, different sets of DMRS ports (the number of antenna ports is 4) are associated with the values ​​of the antenna port field from 0 to 4, respectively.

[0140] <DMRS port with more than 4 layers>

[0141] An example of a table of antenna ports for indicating DMRS ports having a number of layers greater than four when the transform precoder is invalid will be described.

[0142] For codebook-based PUSCH, the UE determines the rank (number of layers) for PUSCH transmission based on the precoding information field of the DCI. For non-codebook-based PUSCH, the UE determines the rank (number of layers) for PUSCH transmission based on the SRS resource indicator field of the DCI.

[0143] In addition, the UE can also determine the table of antenna ports corresponding to the determined rank based on the validity / invalidity of the transform precoder, the DMRS type of the PUSCH set through high-level signaling (which can also be set through the RRC parameter "dmrs-Type"), and the maximum length of the DMRS (which can also be set through the RRC parameter "maxLength").

[0144] In addition, the entry of the reference table (the entry corresponds to a set of the number of CDM groups, the antenna port index of the DMRS, the number of front-load symbols, etc.) can also be determined by the value of the antenna port field of the DCI.

[0145] [DMRS type = 1, DMRS maximum length = 1]

[0146] When DMRS type=1 and DMRS maximum length=1, transmission of up to rank 4 may be supported. In other words, a UE to which DMRS type=1 and DMRS maximum length=1 are set may not support transmission greater than rank 4.

[0147] [DMRS type = 1, DMRS maximum length = 2]

[0148] When DMRS type = 1 and maximum length of DMRS = 2, transmission of up to rank 8 can also be supported.

[0149] Figure 6A-6D This is a diagram showing an example of a table of reference antenna ports when the transform precoder is invalid, the DMRS type=1, and the maximum length of the DMRS=2.

[0150] Fig. 6A This is an example of a table of antenna ports corresponding to rank 5. In this example, different sets of DMRS ports (number of antenna ports 5) are associated with the values ​​of the antenna port field = 0 to 3. In addition, the correspondence between the value and the content of the entry is not limited to this. The same is true for other examples.

[0151] exist Fig. 6A In the example, 2+3 layers and 3+2 layers may also be supported. In addition, only a portion of the entries shown in the figure may be supported. For example, only the entries of DMRS ports 0-4 may be supported for 2+3 layers, and only the entries of DMRS ports 0, 1, 2, 3, and 6 may be supported for 3+2 layers.

[0152] Figure 6B This is an example of a table of antenna ports corresponding to rank 6. In this example, different sets of DMRS ports (the number of antenna ports is 6) are associated with the values ​​of the antenna port field = 0 to 2, respectively.

[0153] exist Figure 6B In the example, 4+2 layers, 2+4 layers, and 3+3 layers may also be supported. In addition, only a specific combination of X and Y (for example, 3+3) for the X+Y layer may be supported.

[0154] Figure 6CThis is an example of a table of antenna ports corresponding to rank 7. In this example, different sets of DMRS ports (the number of antenna ports is 7) are associated with the values ​​of the antenna port field from 0 to 1, respectively.

[0155] exist Figure 6C In the example, 4+3 layers and 3+4 layers can also be supported.

[0156] Fig.6D This is an example of a table of antenna ports corresponding to rank 8. In this example, corresponding to the value of the antenna port field = 0, a set of DMRS ports (the number of antenna ports is 8) is associated.

[0157] exist Fig.6D In the example, only 4+4 layers may be supported.

[0158] [DMRS type = 2, DMRS maximum length = 1]

[0159] When DMRS type = 2 and maximum DMRS length = 1, it can support transmission of up to rank 6, or only support transmission of up to rank 4, or not support transmission of rank 6 (for example, 4+2 layers) and only support transmission of up to rank 5.

[0160] Fig. 7A as well as Figure 7B This is a diagram showing an example of a table of reference antenna ports when the transform precoder is invalid, the DMRS type=2, and the maximum length of the DMRS=1.

[0161] Fig. 7A This is an example of a table of antenna ports corresponding to rank 5. In this example, corresponding to the value of the antenna port field = 0, a set of DMRS ports (the number of antenna ports is 5) is associated.

[0162] Figure 7B This is an example of a table of antenna ports corresponding to rank 6. In this example, corresponding to the value of the antenna port field = 0, a set of DMRS ports (the number of antenna ports is 6) is associated.

[0163] [DMRS type = 2, DMRS maximum length = 2]

[0164] When DMRS type = 2 and maximum DMRS length = 2, transmission of up to rank 8 can also be supported.

[0165] Figure 8A-8D This is a diagram showing an example of a table of reference antenna ports when the transform precoder is invalid, the DMRS type=2, and the maximum length of the DMRS=2.

[0166] Fig. 8AThis is an example of a table of antenna ports corresponding to rank 5. In this example, different sets of DMRS ports (the number of antenna ports is 5) are associated with the values ​​of the antenna port field = 0 to 2, respectively.

[0167] Figure 8B This is an example of a table of antenna ports corresponding to rank 6. In this example, different sets of DMRS ports (the number of antenna ports is 6) are associated with the values ​​of the antenna port field = 0 to 3, respectively.

[0168] exist Figure 8B In the example, 4+2 layers, 2+4 layers, and 3+3 layers may also be supported. In addition, only a specific combination of X and Y (for example, 3+3) for the X+Y layer may be supported. For example, only Figure 8B Entries corresponding to the value of the Antenna Port field = 3 are supported for 3+3.

[0169] Figure 8C This is an example of a table of antenna ports corresponding to rank 7. In this example, different sets of DMRS ports (the number of antenna ports is 7) are associated with the values ​​of the antenna port field = 0 to 2, respectively.

[0170] Fig.8D This is an example of a table of antenna ports corresponding to rank 8. In this example, corresponding to the value of the antenna port field = 0 to 2, a set of DMRS ports (the number of antenna ports is 8) is associated.

[0171] for Fig.8D , or only support entries corresponding to layer 4+4.

[0172] According to the DMRS port indication for a number of layers greater than 4 described above, it is possible to appropriately specify antenna ports for a PUSCH for which a number of layers is greater than 4 when the transform precoder is invalid.

[0173] (analyze)

[0174] However, although examples of DMRS ports with more than 4 layers are recorded, no research has been conducted on DMRS port indications with more than 4 layers for 2 codewords. In addition, there is room for further research on the table of DMRS port indications with more than 4 layers. In addition, there has been no sufficient research on the restrictions (conditions) set for DMRS for PUSCH with more than 4 layers.

[0175] In addition, whether the increased number of DMRS ports should be applied to a high-rank (large layer) PUSCH has not been fully studied. If these studies are insufficient, UL transmission with a number of layers greater than 4 cannot be properly performed, and there is a concern that communication throughput may be reduced.

[0176] Therefore, the inventors of the present invention have conceived a method for appropriately performing UL transmission with a layer number greater than 4.

[0177] 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.

[0178] 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".

[0179] In the present disclosure, activate, deactivate, indicate (or specify (indicate)), 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.

[0180] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, high-layer parameters, information elements (IE), settings, etc. can also be overwritten with each other. In the present disclosure, Medium Access Control (MAC) control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc. can also be overwritten with each other.

[0181] 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.

[0182] In the present disclosure, MAC signaling may also use, for example, MAC Control Element (MACCE), MAC Protocol Data Unit (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.

[0183] 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.

[0184] In the present disclosure, index, identifier (ID), indicator, resource ID, number, etc. may also be mutually replaced. In the present disclosure, sequence, list, set, group, cluster, subset, etc. may also be mutually replaced.

[0185] In the present disclosure, "Rel.XX" indicates a 3GPP version. However, the version number "XX" is an example and may be replaced by another number.

[0186] In the present disclosure, DMRS, DL DMRS, UL DMRS, PDSCH DMRS, and PUSCH DMRS may also be replaced with each other.

[0187] In the present disclosure, orthogonal sequences, OCC, FD OCC, and TD OCC may also be rewritten mutually.

[0188] In the present disclosure, discard, suspend, cancel, truncate, rate match, postpone, etc. can also be rewritten to each other.

[0189] In the present disclosure, DMRS port, antenna port, port, DMRS port index may also be overwritten with each other. In the present disclosure, DMRS CDM group, CDM group, DMRS group, DMRS CDM group without data (DMRS CDM group(s)withoutdata) may also be overwritten with each other. In the present disclosure, antenna port indication and antenna port field may also be overwritten with each other. In the present disclosure, DMRS setting type and DMRS type may also be overwritten with each other. In the present disclosure, the maximum length of DMRS and the number of DMRS symbols may also be overwritten with each other.

[0190] In the present disclosure, CDM group lists and lists may also be overwritten with each other. In the present disclosure, CDM group subsets and group subsets may also be overwritten with each other.

[0191] In the present disclosure, the rank, transmission rank, number of layers, and number of antenna ports may be mutually replaced. One codeword may be applied, and the number of layers may be less than 4. Two codewords may be applied, and the number of layers may be greater than 4.

[0192] (Wireless Communication Method)

[0193] <First Embodiment>

[0194] [When the number of floors is 4 or less]

[0195] The table indicating the antenna ports for PUSCH of Rel. 15 described in FIGS. 1 to 5 can be applied to the case of one codeword (the case where codeword 0 is valid, codeword 1 is invalid, and the number of layers is 4 or less).

[0196] In the case of two codewords configured for simultaneous multi-panel UL transmission, even if the supported rank is 4 or less, the UE can apply the existing tables of the PUSCH of FIGS. 1 to 5 .

[0197] In the case where two codewords are set, if the rank indicated by dynamic scheduling is 4 or less, the UE may apply the existing table for PUSCH of FIGS. 1 to 5 .

[0198] [When the number of layers is greater than 4]

[0199] The UE may also receive an antenna port indication when at least one of the DMRS type and the maximum length of the DMRS is not 1 (for example, using the indication of the PUSCH antenna port indication table shown in Figures 6-8), and based on the indication, control the UL transmission using two codewords (codeword 0 and codeword 1) and the UL transmission using a number of layers greater than 4 (transmitting UL).

[0200] According to the first embodiment, even when the number of layers is greater than 4, UL transmission can be appropriately controlled using the PUSCH antenna port specification table.

[0201] <Second Embodiment>

[0202] Although Figures 6 to 8 show examples of a table of antenna ports for DMRS port indications with a number of layers greater than 4 when the transform precoder is invalid, additional entries may be added to cover all possible layer allocations between two codewords. The number of bits of the antenna port field of the DCI may also use 4 bits in Figures 6 and 7, and 5 bits in Figure 8. The number of bits may also be the same in the present embodiment. In the present disclosure, the DMRS CDM group may also be rewritten as a DMRS CDM group without data.

[0203] [Addition of items in case 2]

[0204] In case 2 (DMRS type = 1, maximum length of DMRS = 2), the UE can also control UL (e.g., PUSCH) transmission so that the sum of the number of DMRS port indices corresponding to the first DMRS CDM group and the number of DMRS port indices corresponding to the second DMRS CDM group becomes the rank number.

[0205] [[Rank 5]]

[0206] As a DMRS structure, it can also be applied to case 2, in the case corresponding to rank 5 Fig. 6A Further items based on at least one of the following principles may also be added.

[0207] (1) Contains 4 DMRS port indexes corresponding to DMRS CDM group #0 and 1 DMRS port index corresponding to DMRS CDM group #1.

[0208] (2) includes one DMRS port index corresponding to DMRS CDM group #0 and four DMRS port indexes corresponding to DMRS CDM group #1.

[0209] (3) includes 3 DMRS port indexes corresponding to DMRS CDM group #0 and 2 DMRS port indexes corresponding to DMRS CDM group #1.

[0210] (4) includes 2 DMRS port indexes corresponding to DMRS CDM group #0 and 3 DMRS port indexes corresponding to DMRS CDM group #1.

[0211] [[Rank 6]]

[0212] As a DMRS structure, it can also be applied to case 2, in the case corresponding to rank 6 Figure 6B Further items based on at least one of the following principles may also be added. Figure 6B The example is an example corresponding to the following principle.

[0213] (1) Contains 4 DMRS port indexes corresponding to DMRS CDM group #0 and 2 DMRS port indexes corresponding to DMRS CDM group #1.

[0214] (2) includes 2 DMRS port indexes corresponding to DMRS CDM group #0 and 4 DMRS port indexes corresponding to DMRS CDM group #1.

[0215] (3) includes 3 DMRS port indexes corresponding to DMRS CDM group #0 and 3 DMRS port indexes corresponding to DMRS CDM group #1.

[0216] [[Rank 7]]

[0217] As a DMRS structure, it can also be applied to case 2, in the case corresponding to rank 7 Figure 6C Further items based on at least one of the following principles may also be added. Figure 6C The example is an example corresponding to the following principle.

[0218] (1) Contains 4 DMRS port indexes corresponding to DMRS CDM group #0 and 3 DMRS port indexes corresponding to DMRS CDM group #1.

[0219] (2) Contains 3 DMRS port indexes corresponding to DMRS CDM group #0 and 4 DMRS port indexes corresponding to DMRS CDM group #1.

[0220] [[Rank 8]]

[0221] As a DMRS structure, it can also be applied to case 2, in the case corresponding to rank 8 Fig.6D Further items based on at least one of the following principles may also be added. Fig.6D The example is an example corresponding to the following principle.

[0222] (1) Contains 4 DMRS port indexes corresponding to DMRS CDM group #0 and 4 DMRS port indexes corresponding to DMRS CDM group #1.

[0223] [Addition of items in case 3]

[0224] In case 3 (DMRS type = 2, maximum length of DMRS = 1), the UE can also control UL (e.g., PUSCH) transmission so that the sum of the number of DMRS port indices corresponding to the first DMRS CDM group, the number of DMRS port indices corresponding to the second DMRS CDM group, and the number of DMRS port indices corresponding to the third DMRS CDM group becomes the rank number.

[0225] [[Rank 5]]

[0226] As a DMRS structure, it can also be applied to case 3, in the case corresponding to rank 5 Fig. 7A In the above, further items based on the following principles may be added. Fig. 7A In the example, 4 DMRS port indexes corresponding to two DMRS CDM groups and 1 DMRS port index corresponding to one DMRS CDM group may also be included.

[0227] (1) includes two DMRS port indexes corresponding to DMRS CDM group #0, two DMRS port indexes corresponding to DMRS CDM group #1, and one DMRS port index corresponding to DMRS CDM group #2.

[0228] (2) includes two DMRS port indexes corresponding to DMRS CDM group #1, two DMRS port indexes corresponding to DMRS CDM group #2, and one DMRS port index corresponding to DMRS CDM group #0.

[0229] [[Rank 6]]

[0230] As a DMRS structure, it can also be applied to case 3, in the case corresponding to rank 6 Figure 7B Entries based on the principle of including 6 DMRS port indices corresponding to 3 DMRS CDM groups may be further added. Figure 7B The example is an example corresponding to the following principle.

[0231] [Addition of items in case 4]

[0232] In case 4 (DMRS type = 2, maximum length of DMRS = 2), the UE can also control UL (e.g., PUSCH) transmission so that the sum of the number of DMRS port indices corresponding to the first DMRS CDM group, the number of DMRS port indices corresponding to the second DMRS CDM group, and the number of DMRS port indices corresponding to the third DMRS CDM group becomes the rank number.

[0233] [[Rank 5]]

[0234] As a DMRS structure, scenario 4 (DMRS type = 2, maximum length of DMRS = 2) can also be applied. Fig. 8A Further items based on the following principles may be added.

[0235] (1) Contains 4 DMRS port indexes corresponding to one DMRS CDM group and 1 DMRS port index corresponding to another DMRS CDM group.

[0236] (2) Contains 3 DMRS port indexes corresponding to one DMRS CDM group and 2 DMRS port indexes corresponding to another DMRS CDM group.

[0237] (3) includes 2 DMRS port indexes corresponding to one (first) DMRS CDM group, 2 DMRS port indexes corresponding to another (second) DMRS CDM group, and 1 DMRS port index corresponding to another (third) DMRS CDM group.

[0238] (4) includes 3 DMRS port indexes corresponding to one (first) DMRS CDM group, 1 DMRS port index corresponding to another (second) DMRS CDM group, and 1 DMRS port index corresponding to another (third) DMRS CDM group.

[0239] [[Rank 6]]

[0240] As a DMRS structure, case 4 (DMRS type = 2, maximum length of DMRS = 2) can also be applied. Figure 8B Further items based on the following principles may be added.

[0241] (1) Contains 4 DMRS port indexes corresponding to one DMRS CDM group and 2 DMRS port indexes corresponding to another DMRS CDM group.

[0242] (2) Contains 3 DMRS port indexes corresponding to one DMRS CDM group and 3 DMRS port indexes corresponding to another DMRS CDM group.

[0243] (3) includes 2 DMRS port indices corresponding to one (first) DMRS CDM group, 2 DMRS port indices corresponding to another (second) DMRS CDM group, and 2 DMRS port indices corresponding to another (third) DMRS CDM group.

[0244] (4) includes 3 DMRS port indexes corresponding to one (first) DMRS CDM group, 2 DMRS port indexes corresponding to another (second) DMRS CDM group, and 1 DMRS port index corresponding to another (third) DMRS CDM group.

[0245] (5) includes 4 DMRS port indexes corresponding to one (first) DMRS CDM group, 1 DMRS port index corresponding to another (second) DMRS CDM group, and 1 DMRS port index corresponding to another (third) DMRS CDM group.

[0246] [[Rank 7]]

[0247] As a DMRS structure, case 4 (DMRS type = 2, maximum length of DMRS = 2) can also be applied. Figure 8C Further items based on the following principles may be added.

[0248] (1) Contains 4 DMRS port indexes corresponding to one DMRS CDM group and 3 DMRS port indexes corresponding to another DMRS CDM group.

[0249] (2) includes 4 DMRS port indexes corresponding to one (first) DMRS CDM group, 2 DMRS port indexes corresponding to another (second) DMRS CDM group, and 1 DMRS port index corresponding to another (third) DMRS CDM group.

[0250] (3) includes 3 DMRS port indexes corresponding to one (first) DMRS CDM group, 3 DMRS port indexes corresponding to another (second) DMRS CDM group, and 1 DMRS port index corresponding to another (third) DMRS CDM group.

[0251] (4) includes 3 DMRS port indices corresponding to one (first) DMRS CDM group, 2 DMRS port indices corresponding to another (second) DMRS CDM group, and 2 DMRS port indices corresponding to another (third) DMRS CDM group.

[0252] [[Rank 8]]

[0253] As a DMRS structure, case 4 (DMRS type = 2, maximum length of DMRS = 2) can also be applied. Fig.8D Further items based on the following principles may be added.

[0254] (1) Contains 4 DMRS port indexes corresponding to one DMRS CDM group and 4 DMRS port indexes corresponding to another DMRS CDM group.

[0255] (2) includes 4 DMRS port indexes corresponding to one (first) DMRS CDM group, 3 DMRS port indexes corresponding to another (second) DMRS CDM group, and 1 DMRS port index corresponding to another (third) DMRS CDM group.

[0256] (3) includes 4 DMRS port indices corresponding to one (first) DMRS CDM group, 2 DMRS port indices corresponding to another (second) DMRS CDM group, and 2 DMRS port indices corresponding to another (third) DMRS CDM group.

[0257] (4) includes 3 DMRS port indices corresponding to one (first) DMRS CDM group, 3 DMRS port indices corresponding to another (second) DMRS CDM group, and 2 DMRS port indices corresponding to another (third) DMRS CDM group.

[0258] According to the second embodiment, even when at least one of the DMRS type and the maximum length of the DMRS is not 1, it is possible to appropriately control UL transmission using the PUSCH antenna port specification table.

[0259] <Third Embodiment>

[0260] The UE may also receive an indication (e.g., an antenna port indication) related to UL (e.g., PUSCH) transmission, and send an UL transmission using a number of layers greater than 4 based on at least one of the following conditions. For example, the UE may be configured / indicated to use an UL transmission using a number of layers greater than 4 when at least one of the following conditions is met, and not be configured / indicated to use an UL transmission using a number of layers greater than 4 when at least one of the following conditions is not met. In addition, UL transmission using a number of layers greater than 4 may be performed when at least one of the following conditions is met, and UL transmission using a number of layers greater than 4 may be discarded when at least one of the following conditions is not met. The following conditions may be pre-defined in the specification, or restricted / set according to the capability report of the corresponding UE.

[0261] Fig. 91 is a flowchart showing an example of processing of the third embodiment. When a condition (e.g., at least one of the following conditions) is satisfied (YES in step S01), the UE performs UL transmission using a layer number greater than 4 (step S02). In this case, the UE may also receive a setting / indication related to UL transmission using a layer number greater than 4 before step S02.

[0262] [Condition 1] is a UE with 6 transmit antennas (6TX) or 8 transmit antennas (8TX) (codebook setting for UL with 6TX or UL with 8TX). The UE may also report the number of transmit antennas (at least one of 6 or 8) used for PUSCH (codebook-based / non-codebook-based) / SRS as a UE capability.

[0263] [Condition 2] The maximum rank of the set UL is greater than 4. In this case, the number of transmit antennas may be set in higher layer signaling (e.g., PUSCH configuration (PUSCH Config) / SRS configuration (SRS Config) of the RRC information element). When set in the SRS configuration, it may be set for each SRS resource / SRS resource set.

[0264] [Condition 3] A specific UL DCI format (e.g., DCI format 0_1 / 0_2) is applied. For example, a PUSCH with more than 4 layers can only be set to DCI format 0_1 ​​(or 0_2), and DCI format 0_2 (or 0_1) is not supported. For PUSCH with more than 4 layers, different settings can be made for DCI format 0_1 ​​and DCI format 02.

[0265] [Condition 4] Dynamic scheduling (DCI-based scheduling) or configured grant is applied. For example, PUSCHs with more than 4 layers can only be configured for dynamic scheduling and do not support configured grants. It is also possible that for each PUSCH with configured grants, a structure different from dynamic scheduling is configured.

[0266] [Condition 5] A specific type of PUSCH (e.g., Message 3 / Message A PUSCH, Message 3 / Message A PUSCH in contention-based random access (Contention based Random Access (CBRA)) or non-contention-free Random Access (Contention Free Random Access (CFRA)), or PUSCH triggered by a specific purpose, etc.) is transmitted. The specific purpose may be, for example, the transmission of UCI (HARQ-ACK / CSI / SR). For example, in Message 3 / Message A PUSCH (PUSCH scheduled by Random Access Response (RAR)) UL grant), the number of layers greater than 4 may not be supported.

[0267] [Condition 6] PUSCH repetition is set. For example, for PUSCH with more than 4 layers, it is not possible to set (or can set) repetitive transmission.

[0268] [Condition 7] The existence (or non-existence) of support / validity / setting / scheduling of simultaneous multi-panel UL transmission. For example, the sending (or non-sending) of UE capability information indicating support for simultaneous multi-panel UL transmission may also be a condition. For example, when simultaneous UL transmission is set / scheduled, PUSCH with more than 4 layers may not be supported.

[0269] According to the third embodiment, the above-mentioned conditions can be used to appropriately limit / set UL transmission (for example, PUSCH) using a layer number greater than 4.

[0270] <Fourth Embodiment>

[0271] As mentioned above, the total number of DMRS ports in Rel.15 is 4 ports in scenario 1, 8 ports in scenario 2, 6 ports in scenario 3, and 12 ports in scenario 4. In future wireless communication systems (e.g., after Rel.18), for example, there is a possibility of increasing to 8 ports in scenario 1, 16 ports in scenario 2, 12 ports in scenario 3, and 24 ports in scenario 4. Hereinafter, these port numbers are sometimes recorded as "increased number of DMRS ports." In addition, the increased number of DMRS ports is not limited to the above examples. In the present disclosure, DMRS ports, DMRS port numbers, and the number of DMRS ports may also be rewritten mutually.

[0272] The UE may also receive a setting related to the number of DMRS ports that is different according to at least one of the number of layers (options 1 and 3) and the UE capability (option 2), and control UL transmission (eg, PUSCH) based on the setting.

[0273] [Option 1] The setting related to the increased number of DMRS ports may not be applied to UL PUSCHs with more than 4 layers. That is, it may be set that the two settings (the setting of the number of DMRS ports in Rel.15 and the setting of the increased number of DMRS ports) cannot be set to the UE at the same time. The setting related to the increased number of DMRS ports may also be set only to UL PUSCHs with less than 4 layers.

[0274] [Option 2] The setting related to the increased number of DMRS ports can also be applied to UL PUSCH with more than 4 layers according to the UE's capabilities (reporting of UE capability information). That is, the two settings (the setting of DMRS ports in Rel.15 and the setting of the increased number of DMRS ports) can also be set to the UE at the same time.

[0275] [Option 3] The setting related to the increased number of DMRS ports may also be applicable only to Case 1 / Case 3 where the maximum number of layers is 6 or 8. That is, the setting related to the increased number of DMRS ports may be performed only when Case 1 / Case 3 is configured for the UE. In Case 2 / Case 4 / Case 3, the existing maximum number of ports can fully correspond to 6 or 8 layers, so the setting related to the increased DMRS ports may not be performed.

[0276] The increased number of DMRS ports for ULs greater than 4 layers may also be applied only to situations where at least one of the conditions shown in the third embodiment is met, and may also be applied based on other conditions restricted / set according to the capability report of the corresponding UE.

[0277] According to the fourth embodiment, the UE can appropriately limit / set the settings related to the increased number of DMRS ports. For example, the UE can refrain from receiving unnecessary settings.

[0278] <Fifth Embodiment>

[0279] As shown in Examples 5-1 to 5-3 described later, a new concept such as a CDM group list may be introduced on a CDM group.

[0280] For example, two lists are shown, and for the DMRS ports of each list, the order of the CDM groups of the existing DMRS port table (e.g., Figures 1-5) can also be reused. For the second list, the DMRS port index j in the DMRS port table can also mean j+P. Here, P can also be the number of DMRS ports in the list (the maximum number of DMRS ports in the list). For the second list, the DMRS CDM group index k in the DMRS port table can also mean k+Q. Here, Q can also be the number of DMRS CDM groups in the list (the maximum number of DMRS CDM groups in the list).

[0281] As shown in Examples 5-4 to 5-6 described later, a new concept such as a CDM group subset may be introduced under a CDM group.

[0282] For example, for each group subset, the order of the CDM groups in the existing DMRS port table (e.g., Figures 1-5) may also be reused. For the second group subset, the DMRS port index j in the DMRS port table may also mean j+P. Here, P may also be the number of DMRS ports in the group subset (the maximum number of DMRS ports in the group subset). For the first group subset, the DMRS port index j in the DMRS port table may also mean j.

[0283] The proposals of Examples 5-1 to 5-6 described below can also be applied to antenna port indication tables of ranks 5 to 8. The new antenna port indication tables of ranks 5 to 8 can also be interpreted per list or per CDM group subset as described above.

[0284] [Example 5-1]

[0285] This embodiment involves mapping of CDM groups and DMRS ports.

[0286] A new concept of CDM group list (list) may also be introduced above the CDM group. The number of CDM groups and the order of CDM groups in each CDM group list may also follow the existing DMRS port table. The CDM group list may also support at least one of the following scenarios 1-1 to 1-4.

[0287] [[Scenario 1-1]]

[0288] It is also possible to use 8 ports. It is also possible to use 2 CDM group lists. It is also possible to have 2 CDM groups per CDM group list. It is also possible to have 2 DMRS ports per CDM group. List #1 may also include CDM groups {0,1}, and list #2 may also include CDM groups {2,3}.

[0289] [[Scenario 1-2]]

[0290] It is also possible to use 16 ports. It is also possible to use 2 CDM group lists. It is also possible to have 2 CDM groups per CDM group list. It is also possible to have 4 DMRS ports per CDM group. List #1 may also include CDM groups {0,1}, and list #2 may also include CDM groups {2,3}.

[0291] [[Scenario 1-3]]

[0292] It is also possible to use 12 ports. It is also possible to use 2 CDM group lists. It is also possible to have 3 CDM groups per CDM group list. It is also possible to have 2 DMRS ports per CDM group. List #1 may also contain CDM groups {0, 1, 2}, and list #2 may also contain CDM groups {3, 4, 5}.

[0293] [[Scenario 1-4]]

[0294] It is also possible to use 24 ports. It is also possible to use 2 CDM group lists. It is also possible to have 3 CDM groups per CDM group list. It is also possible to have 4 DMRS ports per CDM group. List #1 may also contain CDM groups {0,1,2}, and list #2 may also contain CDM groups {3,4,5}.

[0295] For each list of DMRS ports, the order of the CDM groups of the existing DMRS port table may also be reused. For the second list, the DMRS port index j in the DMRS port table may also mean j+P. Here, P may also be the number of DMRS ports in the list (the maximum number of DMRS ports in the list). For the second list, the DMRS CDM group index k in the DMRS port table may also mean k+Q. Here, Q may also be the number of DMRS CDM groups in the list (the maximum number of DMRS CDM groups in the list).

[0296] [Example 5-2]

[0297] This example involves the reuse of an existing antenna port table for PUSCH. This example can also be envisioned using Example 5-1.

[0298] A new field (list indication field) for indicating whether a list is applied to the scheduled PUSCH or whether a list (number of lists, number of lists for rate matching) and at least one of the list indexes may also be added to the DCI format 0_1 / 0_2 (scheduling the PUSCH). For antenna port indication, the existing antenna port table may be reused for each list.

[0299] In the case where the new field indicates a list, the existing antenna port table and the DMRS port index for antenna port indication may also be used. By default, the one list may also be the first list. In the case where the new field indicates a list, the UE may also not send data on the REs represented by the DMRS REs in the first list (for the PUSCH, rate matching may also be performed around the REs represented by the DMRS REs in the first list). In the case where the antenna port field indicates a row with a CDM group number x, not sending data on the REs represented by the DMRS REs in the first list may also mean rate matching in all DMRS ports in the x CDM groups in the first list.

[0300] Whether data is mapped to REs not used for DMRS may be indicated by DCI (scheduling the PUSCH / PDSCH) (similar to the "number of CDM groups without data" in Rel.15). The number of CDM groups without data may be set by higher layer signaling.

[0301] The number of lists may also be set through higher layer signaling. Other parameters such as the maximum number of DMRS ports and the maximum number of DMRS CDM groups may also be set through higher layer signaling, and the UE may also determine the number of lists based on these parameters.

[0302] In the case where one list is indicated, this may also mean that users multiplexed with the UE scheduled for the PUSCH / PDSCH occupy only DMRS ports in one list (by default, list #1). The UE may also perform rate matching around the DMRS REs in one list. In the case where two lists are indicated, this may also mean that users multiplexed with the UE scheduled for the PUSCH / PDSCH occupy DMRS ports in two lists. The UE may also perform rate matching around the DMRS REs in two lists.

[0303] When the new field indicates a list, the new field may also include a list index. When the new field indicates a list and a list index, the one list may also be a list corresponding to the list index.

[0304] In the case where the new field indicates two lists (list #1 and #2), the new field may also contain the list index.

[0305] In the case where the second list is indicated by the list index, in the antenna port table, the indicated DMRS port index j can also be regarded as DMRS port j+P. Here, P can also be the number of maximum DMRS ports per list (maximum number). The number of DMRS CDM groups without data {1, 2, 3} can also refer to the CDM groups in the second list.

[0306] When the first list is indicated by the list index, the indicated DMRS port index j in the antenna port table may be DMRS port j. The number of DMRS CDM groups {1, 2, 3} without data may refer to the CDM groups in the first list.

[0307] When the new field indicates two lists, the UE may not transmit data on the REs indicated by the DMRS REs in the two lists. The UE may also follow either of the rate matching 1 and 2 below.

[0308] [Rate Matching 1]

[0309] The UE may also perform rate matching around the DMRS REs in all DMRS ports in the two lists.

[0310] [Rate Matching 2]

[0311] The UE performs rate matching around the DMRS REs in all DMRS ports in the first list and a certain DMRS port in the second list. An additional field (CDM group number field) for indicating the number of CDM groups in the second list for rate matching may also be appended (to the DCI). The additional field may also be applied only when the DMRS RE positions of the j-th port in the two lists are different. In the case where the second list is indicated by the list index, the additional field is not required, and the UE may also follow the antenna port field for the number of CDM groups for rate matching. In the case where the first list is indicated by the list index, the additional field is valid, and the UE may also follow the number of CDM groups indicated for rate matching.

[0312] For example, the value of the new field may also indicate the following.

[0313] • A value of 00 may also indicate one list for rate matching, and antenna port indication (in the default list #1) for the DMRS.

[0314] The value 01 may also indicate two lists for rate matching and the antenna port indication in list #1 for the DMRS.

[0315] • A value of 10 may also indicate two lists for rate matching, and an antenna port indication within list #2 for the DMRS.

[0316] The value 11 may also be reserved.

[0317] As a variation, even when only one list is indicated, a list index may be required. For example, the value of the new field may also indicate the following.

[0318] • A value of 00 may also indicate one list for rate matching, and antenna port indication within list #1 for the DMRS.

[0319] • A value of 01 may also indicate one list for rate matching and antenna port indication within list #2 for the DMRS.

[0320] • A value of 10 may also indicate two lists for rate matching, and an antenna port indication within list #1 for the DMRS.

[0321] • A value of 11 may also indicate two lists for rate matching, and an antenna port indication within list #2 for the DMRS.

[0322] [Example 5-3]

[0323] For example, in the example of the existing antenna port table ( FIG. 1 ) for PUSCH, DMRS setting type 1, DMRS maximum length=1, rank=1, the interpretation of the existing antenna port table may also follow as follows.

[0324] In list #1, DMRS CDM group numbers 1 and 2 without data may refer to CDM groups {0} and {0, 1}, respectively.

[0325] In list #2, the DMRS CDM group numbers 1 and 2 without data may refer to CDM groups {2} and {2,3} in list #2, respectively.

[0326] In the case where two lists are indicated and list #2 is indicated, port index j may also mean the jth port in list #2. In case 1, port index j may also be index j+P=j+4 in list #2. For list #2, DMRS ports 0, 1, 2, 3 may also be interpreted as DMRS ports 4, 5, 6, 7, respectively.

[0327] According to Example 5-3, DMRS ports can be increased without changing the antenna port table.

[0328] [Example 5-4]

[0329] This example involves mapping of CDM groups and DMRS ports.

[0330] A new concept of CDM group subset (group subset) may also be introduced under the CDM group. The number of CDM groups and the order of CDM groups in each CDM group subset may also follow the existing DMRS port table. The CDM group subset may also support at least one of the following scenarios 4-1 to 4-4.

[0331] [[Scenario 4-1]]

[0332] It is also possible to use 8 ports. It is also possible to use 2 CDM groups. It is also possible to have 2 group subsets for each CDM group. It is also possible to correspond to 4 DMRS ports for each CDM group. Each of the group subsets #1 and #2 can also correspond to the CDM group {0,1}.

[0333] [[Scenario 4-2]]

[0334] It is also possible to use 16 ports. It is also possible to use 2 CDM groups. It is also possible to have 2 group subsets for each CDM group. It is also possible to correspond to 8 DMRS ports for each CDM group. Each of the group subsets #1 and #2 can also correspond to the CDM group {0,1}.

[0335] [[Scenario 4-3]]

[0336] It is also possible to use 12 ports. It is also possible to use 3 CDM groups. It is also possible to have 2 subsets per CDM group. It is also possible to correspond to 4 DMRS ports for each CDM group. Each of the subsets #1 and #2 may correspond to CDM groups {0, 1, 2}.

[0337] [[Scenario 4-4]]

[0338] It is also possible to use 24 ports. It is also possible to use 3 CDM groups. It is also possible to have 2 subsets per CDM group. It is also possible to correspond to 8 DMRS ports for each CDM group. Each of the subsets #1 and #2 may correspond to CDM groups {0, 1, 2}.

[0339] For each group subset, the order of the CDM groups of the existing DMRS port table may also be reused. For the second group subset, the DMRS port index j in the DMRS port table may also mean j+P. Here, P may also be the number of DMRS ports in the group subset (the maximum number of DMRS ports in the group subset). For the first group subset, the DMRS port index j in the DMRS port table may also mean j.

[0340] [Example 5-5]

[0341] This example involves the reuse of an existing antenna port table.

[0342] A new field (group subset indication field) for indicating whether a group subset is applied to the scheduled PUSCH / PDSCH or whether a group subset (number of group subsets, number of group subsets for rate matching) and at least one of the group subset indexes may also be added to the DCI format 0_1 / 0_2 / 1_1 / 1_2 (scheduling the PUSCH / PDSCH). For antenna port indication, the existing antenna port table may be reused for each group subset.

[0343] In the case where the new field indicates a group subset, the existing antenna port table and the DMRS port index used for antenna port indication may also be used. By default, the one group subset may also be the first group subset. In the case where the new field indicates a group subset, the UE may also not send / receive data on the RE represented by the DMRS RE in the first group subset (for the PUSCH / PDSCH, rate matching may also be performed around the RE represented by the DMRS RE in the first group subset). In the case where the antenna port field indicates a row with a CDM group number x, not sending / receiving data on the RE represented by the DMRS RE in the first group subset may also mean rate matching in all DMRS ports in the x CDM groups in the first group subset.

[0344] Whether data is mapped to REs not used for DMRS may be indicated by DCI (scheduling the PUSCH / PDSCH) (similar to the "number of CDM groups without data" in Rel.15). The number of CDM groups without data may be set by higher layer signaling.

[0345] The number of group subsets may also be set through higher layer signaling. Other parameters such as the maximum number of DMRS ports and the maximum number of DMRS CDM groups may also be set through higher layer signaling, and the UE may also determine the number of group subsets based on the parameters.

[0346] In the case where one group subset is indicated, this may also mean that the users multiplexed with the UE scheduled for the PUSCH / PDSCH occupy only the DMRS ports within one group subset (by default, group subset #1). The UE may also perform rate matching around the DMRS REs within one group subset. In the case where two group subsets are indicated, this may also mean that the users multiplexed with the UE scheduled for the PUSCH / PDSCH occupy the DMRS ports within two group subsets. The UE may also perform rate matching around the DMRS REs within two group subsets.

[0347] In the case where the new field indicates a group subset, the new field may also include a group subset index. In the case where the new field indicates a group subset and a group subset index, the group subset may also be the group subset corresponding to the group subset index.

[0348] In the case where the new field indicates two group subsets (group subsets #1 and #2), the new field may also include a group subset index.

[0349] In the case where the second group subset is indicated by the group subset index, in the antenna port table, the indicated DMRS port index j can also be regarded as DMRS port j+P. Here, P can also be the number of maximum DMRS ports (maximum number) of each group subset. The number of DMRS CDM groups without data {1, 2, 3} can also refer to the CDM group in the second group subset.

[0350] When the first group subset is indicated by the group subset index, the indicated DMRS port index j in the antenna port table may also be DMRS port j. The number of DMRS CDM groups {1, 2, 3} without data may also refer to the CDM groups in the first group subset.

[0351] In the case where the new field indicates two group subsets, the UE may not transmit / receive data on the REs indicated by the DMRS REs in the two group subsets. The UE may also follow any of the following rate matching 1 and 2.

[0352] [Rate Matching 1]

[0353] The UE may also perform rate matching around the DMRS REs in all DMRS ports in the two group subsets.

[0354] [Rate Matching 2]

[0355] The UE performs rate matching around the DMRS REs in all DMRS ports in the first group subset and a certain DMRS port in the second group subset. An additional field (CDM group number field) for indicating the number of CDM groups in the second group subset for rate matching may also be appended (to the DCI). The additional field may also be applied only when the DMRS RE positions of the j-th port in the two group subsets are different. In the case where the second group subset is indicated by the group subset index, the additional field is not required, and the UE may also follow the antenna port field for the number of CDM groups for rate matching. In the case where the first group subset is indicated by the group subset index, the additional field is valid, and the UE may also follow the number of CDM groups indicated for rate matching.

[0356] For example, the value of the new field may also indicate the following.

[0357] • A value of 00 may also indicate a group subset for rate matching and an antenna port indication (within the default group subset #1) for the DMRS.

[0358] The value 01 may also indicate two group subsets for rate matching and an antenna port indication within group subset #1 for the DMRS.

[0359] A value of 10 may also indicate two group subsets for rate matching, and an antenna port indication within group subset #2 for the DMRS.

[0360] The value 11 may also be reserved.

[0361] As a variation, even in the case where only one group subset is indicated, a group subset index may be required. For example, the value of the new field may also indicate the following.

[0362] The value 00 may also indicate a group subset for rate matching and an antenna port indication within group subset #1 for the DMRS.

[0363] The value 01 may also indicate a group subset for rate matching and an antenna port indication within group subset #2 for the DMRS.

[0364] A value of 10 may also indicate two group subsets for rate matching, and an antenna port indication within group subset #1 for the DMRS.

[0365] The value 11 may also indicate two group subsets for rate matching and an antenna port indication within group subset #2 for the DMRS.

[0366] [Example 5-6]

[0367] For example, in the example of the existing antenna port table ( FIG. 1 ) for DMRS setting type 1 and DMRS maximum length=1, the interpretation of the existing antenna port table may also follow as follows.

[0368] DMRS without data CDM group numbers 1 and 2 may refer to CDM groups {0} and {0, 1}, respectively.

[0369] In group subset #1, CDM group 0 may also correspond to DMRS port index {0, 1}, and CDM group 1 may also correspond to DMRS port index {2, 3}.

[0370] In group subset #2, CDM group 0 may also correspond to DMRS port index {4, 5}, and CDM group 1 may also correspond to DMRS port index {6, 7}.

[0371] · When being instructed of two group subsets and being instructed of group subset #2, the port index j may also mean the j-th port within group subset #2. The port index j may also be the index j + P = j + 4 within group subset #2. For group subset #2, DMRS ports 0, 1, 2, 3 may also be interpreted as DMRS ports 4, 5, 6, 7 respectively.

[0372] According to this example, it is possible to increase DMRS ports without changing the antenna port table.

[0373] According to the fifth embodiment, by using lists and subsets, it is possible to increase DMRS ports without changing the antenna port table.

[0374] <UE capability>

[0375] The UE may also send (report) UE capability information indicating whether it supports at least one of the examples in the present disclosure to the network (base station). In addition, the UE may receive an indication / setting (e.g., an indication / setting for valid / invalid) related to at least one of the examples in the present disclosure through higher layer signaling / physical layer signaling. This indication / setting may also correspond to the UE capability information sent by the UE. At least one of the examples in the present disclosure may also be applied only to the UE that has received this indication / setting, the UE that has sent the corresponding UE capability information, or the UE that supports the corresponding UE capability.

[0376] (Wireless communication system)

[0377] Hereinafter, the structure of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above-described embodiments of the present disclosure.

[0378] Fig.10 is a diagram showing an example of the schematic structure of a wireless communication system according to an embodiment. The wireless communication system 1 may also be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the 5th generation mobile communication system New Radio (5G NR), or the like.

[0379] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can 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.

[0380] 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.

[0381] The wireless communication system 1 can 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)).

[0382] 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.

[0383] 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).

[0384] 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 (lower than 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (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.

[0385] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0386] Multiple base stations 10 may also be connected via wired (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.

[0387] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0388] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0389] 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.

[0390] 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.

[0391] In the wireless communication system 1, as downlink channels, 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)) and the like may be used.

[0392] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like may be used as uplink channels.

[0393] The PDSCH transmits user data, high-layer control information, system information block (SIB), etc. The PUSCH transmits user data, high-layer control information, etc. In addition, the PBCH transmits the master information block (MIB).

[0394] The PDCCH may also transmit lower layer control information. 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.

[0395] 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.

[0396] 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.

[0397] 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.

[0398] Through PUCCH, uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also called hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.) and scheduling request (SR) can also be transmitted. Through PRACH, random access preambles for establishing a connection with a cell can also be transmitted.

[0399] In the present disclosure, downlink, uplink, etc. may be expressed without the word “link.” In addition, various channels may be expressed without the word “physical” at the beginning.

[0400] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. 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. may also be transmitted as DL-RS.

[0401] 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 (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0402] 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. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0403] (Base Station)

[0404] Fig.11 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.

[0405] 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.

[0406] 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.

[0407] 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.

[0408] 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.

[0409] 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.

[0410] 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.

[0411] 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.

[0412] 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.

[0413] 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 (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0414] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (Discrete Fourier Transform (DFT)) processing (as needed), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0415] 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 .

[0416] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0417] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter 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.

[0418] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (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 (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0419] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, 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.

[0420] 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 .

[0421] In addition, the transmitting / receiving unit 120 may also transmit an antenna port indication when at least one of the set demodulation reference signal (DeModulation Reference Signal (DMRS)) type and the maximum length of the DMRS is not 1.

[0422] The control unit 110 may also control reception of an uplink (UL) transmission corresponding to two codewords and using a number of layers greater than 4, which is transmitted based on the antenna port indication.

[0423] The transmitting and receiving unit 120 may also transmit instructions related to uplink (UL) transmissions. The control unit 110 may also control reception of the UL transmissions that are transmitted based on specific conditions and that use a number of layers greater than 4.

[0424] (User Terminal)

[0425] Fig.12 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 each be provided with one or more.

[0426] 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.

[0427] 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.

[0428] 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.

[0429] 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.

[0430] 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.

[0431] 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.

[0432] 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.

[0433] 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.

[0434] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0435] 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, 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.

[0436] 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.

[0437] The transmitting and receiving unit 220 (RF unit 222 ) 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 230 .

[0438] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0439] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter 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.

[0440] 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 measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0441] 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 .

[0442] In addition, the transmitting / receiving unit 220 may also receive an antenna port indication when at least one of the set demodulation reference signal (DeModulation Reference Signal (DMRS)) type and the maximum length of the DMRS is not 1.

[0443] The control unit 210 may also control uplink (UL) transmission corresponding to two codewords and using the UL transmission with a number of layers greater than 4 based on the antenna port indication.

[0444] The control unit 210 may also control the UL transmission when the DMRS type is 1 and the maximum length of the DMRS is 2 so that the sum of the number of DMRS port indexes corresponding to the first DMRS CDM group and the number of DMRS port indexes corresponding to the second DMRS CDM group becomes the rank number.

[0445] The control unit 210 may also control the UL transmission when the DMRS type is 2 and the maximum length of the DMRS is 1 so that the sum of the number of DMRS port indexes corresponding to the first DMRS CDM group, the number of DMRS port indexes corresponding to the second DMRS CDM group, and the number of DMRS port indexes corresponding to the third DMRS CDM group becomes the rank number.

[0446] The control unit 210 may also control the UL transmission when the DMRS type is 2 and the maximum length of the DMRS is 2 so that the sum of the number of DMRS port indexes corresponding to the first DMRS CDM group, the number of DMRS port indexes corresponding to the second DMRS CDM group, and the number of DMRS port indexes corresponding to the third DMRS CDM group becomes the rank number.

[0447] The transmitting and receiving unit 220 may also receive an indication related to an uplink (UL) transmission. The control unit 210 may also control the UL transmission using a layer number greater than 4 based on a specific condition.

[0448] The specific condition may also be a designation related to at least one of the number and rank of transmitting antennas. The specific condition may also be at least one of a specific DCI format, dynamic scheduling, setting permission, and a specific type of physical uplink shared channel applied to the UL transmission.

[0449] The transmitting and receiving unit 220 may also receive a setting related to the number of demodulation reference signal (DMRS) ports that is different according to at least one of the number of layers and the capability of the terminal. The control unit 210 may also control the UL transmission based on the setting.

[0450] (Hardware Structure)

[0451] 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 devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected 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.

[0452] 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 is not particularly limited.

[0453] 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.13 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0454] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. can be interchangeably used. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0455] 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.

[0456] 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.

[0457] 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 above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0458] In addition, the processor 1001 reads the program (program code), 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 same can be implemented for other functional blocks.

[0459] 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.

[0460] 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 suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0461] 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 called 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).

[0462] 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 implements 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).

[0463] 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.

[0464] 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.

[0465] (Variation Example)

[0466] 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 also be rewritten with each other. 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 standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0467] A wireless 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 wireless 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).

[0468] 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 a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filtering process performed by a transmitter and receiver in the frequency domain, a specific windowing process performed by a transmitter and receiver in the time domain, and the like.

[0469] 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.

[0470] A time slot may also include 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 fewer 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.

[0471] 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.

[0472] 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 (e.g., 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.

[0473] 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.

[0474] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0475] In addition, when a time slot or a mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can 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 can also be controlled.

[0476] 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.

[0477] In addition, a long TTI (e.g., normal TTI, subframe, etc.) can also be rewritten as a TTI with a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) can also be rewritten as a TTI with a TTI length shorter than that of the long TTI and longer than 1 ms.

[0478] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers (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, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0479] 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.

[0480] 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.

[0481] 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.

[0482] A Bandwidth Part (BWP) (also referred to as a partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, a common RB may also be identified by an index of the RB relative to a common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0483] 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.

[0484] At least one of the set BWPs may be activated, and the UE may not assume that it will transmit or receive a specific signal / channel other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0485] 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 in each 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.

[0486] 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.

[0487] In the present disclosure, the names used for parameters, etc. are not restrictive in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. 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 restrictive in all respects.

[0488] Information, signals, etc. described in this 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.

[0489] Furthermore, 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.

[0490] 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 appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0491] 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.

[0492] 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)).

[0493] 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).

[0494] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0495] 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 modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0496] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when 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.

[0497] 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.

[0498] 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", "transmission 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.

[0499] 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-micro cell, and micro-micro cell.

[0500] 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.

[0501] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0502] There are also cases where a mobile station is 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.

[0503] 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.

[0504] 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, bicycles, networked cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, trailers, rickshaws, ships (ships and other watercrafts), airplanes, rockets, artificial satellites, drones, multi-rotor aircraft, quadcopters, balloons and objects carried by them, and are not limited to these. In addition, the mobile body can also be a mobile body that moves autonomously based on operating instructions.

[0505] The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body 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 also includes 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.

[0506] Fig.14 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.

[0507] 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 performs steering of 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.

[0508] 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).

[0509] 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.

[0510] The information service unit 59 is composed of various devices such as a car 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, etc. to provide various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0511] 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.).

[0512] The driving assistance system unit 64 is composed of various devices for providing functions for preventing accidents before they happen or reducing the driver's driving load, such as millimeter wave radar, light detection and ranging (LiDAR), camera, positioning device (for example, Global Navigation Satellite System (GNSS)), map information (for example, high-precision (High Definition (HD))) map, autonomous vehicle (Autonomous Vehicle (AV)) map, etc.), gyroscope system (for example, inertial measurement unit (Inertial Measurement Unit (IMU))), inertial navigation unit (Inertial Navigation System (INS))), artificial intelligence (Artificial Intelligence (AI)) chip, AI processor, and one or more ECUs that control these devices. In addition, the driving assistance system unit 64 sends and receives various information via the communication module 60 and realizes driving assistance function or autonomous driving function.

[0513] 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 of the vehicle 40 via the communication port 63.

[0514] 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 between external devices 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).

[0515] 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.

[0516] 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)).

[0517] 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, the various sensors 50-58, etc., which are provided in the vehicle 40 based on the information stored in the memory 62.

[0518] 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", "downlink", etc. may also be rewritten as terms corresponding to communication between terminals (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may also be rewritten as sidelink channels.

[0519] 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.

[0520] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node (uppernode) 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, considering the Mobility Management Entity (MME)), the Serving-Gateway (S-GW), etc., but not limited to these) or a combination thereof.

[0521] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, 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 methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0522] The various modes / implementations described in the present disclosure may also 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)), IEEE802.16 (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, corrections, generation or regulations, etc. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0523] 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”.

[0524] 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.

[0525] The term "determining" used in the present 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".

[0526] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0527] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as a situation where "judgment (decision)" is performed. That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as a situation where "judgment (decision)" is performed.

[0528] In addition, "judge (decide)" can also be rewritten as "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0529] 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".

[0530] 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., and as several non-limiting and non-inclusive examples, being "connected" or "combined" to each other using electromagnetic energy with a wavelength in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc.

[0531] 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".

[0532] 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.

[0533] 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.

[0534] The invention involved in the present disclosure has been 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 receives an antenna port indication when at least one of a set demodulation reference signal, namely, a DMRS type and a maximum length of the DMRS is not 1; and The control unit controls uplink transmission corresponding to two codewords, namely, UL transmission, and uses the UL transmission with a number of layers greater than 4, based on the antenna port indication.

2. The terminal according to claim 1, wherein: When the DMRS type is 1 and the maximum length of the DMRS is 2, the control unit controls the UL transmission so that the sum of the number of DMRS port indexes corresponding to the first DMRS CDM group and the number of DMRS port indexes corresponding to the second DMRS CDM group becomes the rank number.

3. The terminal according to claim 1, wherein: When the DMRS type is 2 and the maximum length of the DMRS is 1, the control unit controls the UL transmission so that the sum of the number of DMRS port indexes corresponding to the first DMRS CDM group, the number of DMRS port indexes corresponding to the second DMRS CDM group, and the number of DMRS port indexes corresponding to the third DMRS CDM group becomes the rank number.

4. The terminal according to claim 1, wherein: When the DMRS type is 2 and the maximum length of the DMRS is 2, the control unit controls the UL transmission so that the sum of the number of DMRS port indexes corresponding to the first DMRS CDM group, the number of DMRS port indexes corresponding to the second DMRS CDM group, and the number of DMRS port indexes corresponding to the third DMRS CDM group becomes the rank number.

5. A wireless communication method of a terminal, comprising: A step of receiving an antenna port indication when at least one of a set demodulation reference signal, namely, a DMRS type and a maximum length of the DMRS is not 1; and Based on the antenna port indication, a step of controlling uplink transmission corresponding to two codewords, i.e., UL transmission, and using the UL transmission with a number of layers greater than 4.

6. A base station, comprising: a transmitting unit, configured to transmit an antenna port indication when at least one of a set demodulation reference signal, namely, a DMRS type and a maximum length of the DMRS is not 1; and The control unit controls reception of uplink transmission, ie, UL transmission, which is transmitted based on the antenna port indication and corresponds to two codewords and uses a layer number greater than 4.

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