Terminal, wireless communication method, base station, and system

Abstract

Provided is a terminal according to one embodiment of the present disclosure characterized to have: a receiving unit that receives an antenna port instruction in a case where a set demodulation reference signal (DMRS) type and / or the 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 which correspond to two codewords and use the number of layers greater than four. Said one embodiment makes it possible to suitably control UL transmission with the number of layers greater than four.

Description

Technical Field

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

Background Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was standardized for the purpose of further high-speed data rates, low latency, etc. (Non-Patent Document 1). Also, for the purpose of further large capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9), LTE-Advanced (3GPP Rel. 10-14) was standardized.

[0003] Successor systems to LTE (for example, also referred to as 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 considered.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In Rel.15 NR, uplink (UL) multi-input multi-output (MIMO) transmission up to 4 layers is supported. In future wireless communication systems, it is being considered that a terminal (user equipment, UE) supports UL transmission with a layer number greater than 4 in order to achieve higher spectral efficiency.

[0006] However, regarding UL transmission with a layer number greater than 4, there has been no further study on how the network grasps the antenna configuration of the UE and how to cause the UE to perform the UL transmission. If this control is not clarified, there is a risk that the increase in communication throughput will be suppressed.

[0007] Therefore, one object of the present disclosure is to provide a terminal and a wireless communication method that can appropriately control UL transmission with a layer number greater than 4. 、 Base station and system as one of the purposes.

Means for Solving the Problems

[0008] A terminal according to an aspect of the present disclosure includes a reception unit that receives an antenna port indication when the type of a set demodulation reference signal (DMRS) of type if it is not of the first type, or the maximum of the DMRS the length is is not 1, and a control unit that controls UL transmission corresponding to two codewords and using a layer number greater than 4 based on the antenna port indication. and when the type of the DMRS is the first type and the maximum length of the DMRS is 2, the control unit controls the UL transmission such 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 is the rank number It is characterized by doing so.

Effects of the Invention

[0009] According to one aspect of the present disclosure, UL transmissions with a layer number greater than 4 can be appropriately controlled.

Brief Description of the Drawings

[0010]

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DETAILED DESCRIPTION OF THE INVENTION

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

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

[0013] One SRS resource set may be related to a predetermined number of SRS resources (a predetermined number of SRS resources may be grouped). Each SRS resource may be specified by an SRS resource indicator (SRI) or an SRS resource ID (Identifier).

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

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

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

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

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

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

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

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

[0022] The spatial relationship information of the SRS may include the serving cell index corresponding to the above-mentioned predetermined reference signal, the BWP index (BWP ID), and the like.

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

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

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

[0026] In Rel.15 / 16 NR, for PUSCH, when using codebook-based transmission, the UE may have a codebook SRS resource set with a maximum of 2 SRS resources, which is set by the RRC, and one of the maximum 2 SRS resources may be indicated by the DCI (1-bit SRI field). The transmission beam of the PUSCH will be specified by the SRI field.

[0027] The UE may determine the TPMI and the number of layers (transmission rank) for the PUSCH based on the precoding information and the number of layers field (hereinafter also referred to as the precoding information field). The UE may select a precoder based on the above TPMI, 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 upper layer parameters set for the SRS resource specified by the above SRI field.

[0028] In Rel.15 / 16 NR, for PUSCH, when using non-codebook-based transmission, the UE may have a non-codebook SRS resource set with a maximum of 4 SRS resources, which is set by the RRC, and one or more of the maximum 4 SRS resources may be indicated by the DCI (2-bit SRI field).

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

[0030] When the CSI-RS (which may be referred to as associated CSI-RS) related to the SRS resource (or the SRS resource set to which the SRS resource belongs) is configured in the upper layer, the transmission beam of the PUSCH may be calculated based on the configured associated CSI-RS (measurement). Otherwise, the transmission beam of the PUSCH may be specified by the SRI.

[0031] Note that the UE may set whether to use codebook-based PUSCH transmission or non-codebook-based PUSCH transmission according to the upper layer parameter "txConfig" indicating the transmission scheme. The parameter may indicate a value of "codebook" or "nonCodebook".

[0032] In the present disclosure, codebook-based PUSCH (codebook-based PUSCH transmission, codebook-based transmission) may mean the PUSCH when "codebook" is set as the transmission scheme for the UE. In the present disclosure, non-codebook-based PUSCH (non-codebook-based PUSCH transmission, non-codebook-based transmission) may mean the PUSCH when "nonCodebook" is set as the transmission scheme for the UE.

[0033] (DMRS) The front-loaded DMRS is the first (the first symbol or a symbol near the first one) DMRS for earlier demodulation. The additional DMRS can be configured by the RRC for high-speed moving UEs or for high modulation and coding scheme (MCS) / rank. The frequency position of the additional DMRS is the same as that of the front-loaded DMRS.

[0034] For the time domain, DMRS mapping type A or B is configured. In DMRS mapping type A, the DMRS position l_0 is counted by the symbol index within a slot. l_0 is configured by the parameter (dmrs-TypeA-Position) within the MIB or the common serving cell configuration (ServingCellConfigCommon). The DMRS position 0 (reference point l) means the first symbol of a slot or each frequency hop. In DMRS mapping type B, the DMRS position l_0 is counted by the symbol index within the PDSCH / PUSCH. l_0 is always 0. The DMRS position 0 (reference point l) means the first symbol of the PDSCH / PUSCH or each frequency hop.

[0035] The DMRS position is defined by the specification table and depends on the duration of the PDSCH / PUSCH. The position of the additional DMRS is fixed.

[0036] For the frequency domain, (PDSCH / PUSCH) DMRS configuration type 1 or 2 is configured. DMRS configuration type 1 has a comb structure and is applicable to both CP-OFDM (transport precoding = disabled) and DFT-S-OFDM (transport precoding = enabled). DMRS configuration type 2 is only applicable to CP-OFDM.

[0037] Single-symbol DMRS or double-symbol DMRS is configured.

[0038] The single-symbol DMRS is commonly used (mandatory in Rel. 15). In the single-symbol DMRS, the number of additional DMRS (symbols) is {0, 1, 2, 3}. The single-symbol DMRS supports both the case where frequency hopping is enabled and the case where it is disabled. If the maximum number (maxLength) in the uplink DMRS configuration (DMRS-UplinkConfig) is not set, the single-symbol DMRS is used.

[0039] The double-symbol DMRS is used for more DMRS ports (especially MU-MIMO). In the double-symbol DMRS, the number of additional DMRS (symbols) is {0, 1}. The double-symbol DMRS supports the case where frequency hopping is disabled. If the maximum number (maxLength) in the uplink DMRS configuration (DMRS-UplinkConfig) is 2 (len2), whether it is the single-symbol DMRS or the double-symbol DMRS is determined by DCI or the configured grant.

[0040] From the above, the possible setting patterns of DMRS are considered to be the following combinations. · DMRS setting type 1, DMRS mapping type A, single-symbol DMRS · DMRS setting type 1, DMRS mapping type A, double-symbol DMRS · DMRS setting type 1, DMRS mapping type B, single-symbol DMRS · DMRS setting type 1, DMRS mapping type B, double-symbol DMRS · DMRS setting type 2, DMRS mapping type A, single-symbol DMRS · DMRS setting type 2, DMRS mapping type A, double-symbol DMRS · DMRS setting type 2, DMRS mapping type B, single-symbol DMRS ·DMRS Configuration Type 2, DMRS Mapping Type B, Double Symbol DMRS

[0041] Multiple DMRS ports mapped to the same RE (resource of time and frequency) are called a DMRS CDM group.

[0042] For DMRS Configuration Type 1 and Single Symbol DMRS, 4 DMRS ports can be used. Within each DMRS CDM group, 2 DMRS ports are multiplexed by an FD OCC of length 2. Between multiple DMRS CDM groups (2 DMRS CDM groups), 2 DMRS ports are multiplexed by FDM.

[0043] For DMRS Configuration Type 1 and Double Symbol DMRS, 8 DMRS ports can be used. Within each DMRS CDM group, 2 DMRS ports are multiplexed by an FD OCC of length 2 and 2 DMRS ports are multiplexed by a TD OCC. Between multiple DMRS CDM groups (2 DMRS CDM groups), 2 DMRS ports are multiplexed by FDM.

[0044] For DMRS Configuration Type 2 and Single Symbol DMRS, 6 DMRS ports can be used. Within each DMRS CDM group, 2 DMRS ports are multiplexed by an FD OCC of length 2. Between multiple DMRS CDM groups (3 DMRS CDM groups), 3 DMRS ports are multiplexed by FDM.

[0045] For DMRS Configuration Type 2 and Double Symbol DMRS, 12 DMRS ports can be used. Within each DMRS CDM group, 2 DMRS ports are multiplexed by an FD OCC of length 2 and 2 DMRS ports are multiplexed by a TD OCC. Between multiple DMRS CDM groups (3 DMRS CDM groups), 3 DMRS ports are multiplexed by FDM.

[0046] Here, an example of DMRS mapping type B has been shown, but the same also applies to DMRS mapping type A.

[0047] In the parameters for PDSCH DMRS, DMRS ports 1000 - 1007 can be used for DMRS configuration type 1, and DMRS ports 1000 - 1011 can be used for DMRS configuration type 2.

[0048] In the parameters for PUSCH DMRS, DMRS ports 0 - 7 can be used for DMRS configuration type 1, and DMRS ports 0 - 11 can be used for DMRS configuration type 2.

[0049] (Reference signal ports) For orthogonalization of MIMO layers, etc., reference signals of multiple ports (e.g., Demodulation Reference Signal (DMRS), CSI-RS) are used.

[0050] 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 1 UE and for each UE.

[0051] Note that using a CSI-RS port number with a value larger than the number of layers used for data enables more accurate measurement of the channel state based on this CSI-RS and is expected to contribute to throughput improvement.

[0052] In Rel-15 NR, for the DMRS of multiple ports, by using Frequency Division Multiplexing (FDM), Frequency Domain Orthogonal Cover Code (FD-OCC), Time Domain OCC (TD-OCC), etc., up to 8 ports are supported for Type 1 DMRS (in other words, DMRS configuration type 1), and up to 12 ports are supported for Type 2 DMRS (in other words, DMRS configuration type 2).

[0053] In Rel-15 NR, as the above FDM, a comb-shaped transmission frequency pattern (comb-shaped resource set) is used. As the above FD-OCC, Cyclic Shift (CS) is used. Also, the above TD-OCC can be applied only to double-symbol DMRS.

[0054] The OCC of the present disclosure may be mutually rewritten with orthogonal codes, orthogonalization, cyclic shift, etc.

[0055] Note that the type of DMRS may also be called DMRS Configuration type.

[0056] Among DMRS, the DMRS that is resource-mapped in units of two consecutive (adjacent) symbols may also be called double-symbol DMRS, and the DMRS that is resource-mapped in units of one symbol may also be called single-symbol DMRS.

[0057] Both types of DMRS may be mapped to one or more symbols per slot according to the length of the data channel. The DMRS mapped to the start position of the data symbol may also be called front-loaded DMRS, and the DMRS additionally mapped to other positions may also be called additional DMRS.

[0058] In the case of DMRS configuration type 1 and single-symbol DMRS, Comb and CS may be used for orthogonalization. For example, by using two types of Comb and two types of CS (Comb2 + 2CS), up to 4 antenna ports (AP) may be supported.

[0059] In the case of DMRS configuration type 1 and double-symbol DMRS, Comb, CS, and TD-OCC may be used for orthogonalization. For example, by using two types of Comb, two types of CS, and TD-OCC ({1,1} and {1, -1}), up to 8 AP may be supported.

[0060] In the case of DMRS configuration type 2 and single-symbol DMRS, FD-OCC may be used for orthogonalization. For example, by applying orthogonal codes (2-FD-OCC) to two adjacent resource elements (RE) in the frequency direction, up to 6 AP may be supported.

[0061] In the case of DMRS configuration type 2 and double-symbol DMRS, FD-OCC and TD-OCC may be used for orthogonalization. For example, by applying orthogonal codes (2-FD-OCC) to two adjacent RE in the frequency direction and applying TD-OCC ({1,1} and {1, -1}) to two adjacent RE in the time direction, up to 12 AP may be supported.

[0062] Also, in Rel-15 NR, for multi-port CSI-RS, up to 32 ports are supported by using frequency division multiplexing (FDM), time division multiplexing (TDM), frequency domain OCC, time domain OCC, etc. For the orthogonalization of CSI-RS, a method similar to the above-mentioned DMRS may be applied.

[0063] Now, the group of DMRS ports orthogonalized by FD-OCC / TD-OCC as described above is also called a Code Division Multiplexing (CDM) group.

[0064] Since different CDM groups are FDM'd, they are orthogonal. On the other hand, within the same CDM group, due to channel fluctuations etc., the orthogonality of the applied OCC may be disrupted. In this case, if signals within the same CDM group are received with different received powers, a near-far problem may occur and orthogonality may not be guaranteed.

[0065] Here, the TD-OCC / FD-OCC of the Rel.15 NR DMRS will be described. The DMRS mapped to a Resource Element (RE) may correspond to a sequence obtained by multiplying the DMRS sequence by the FD-OCC parameter (which may also be called a sequence element etc.) w f (k’) and the TD-OCC parameter (which may also be called a sequence element etc.) w t (l’).

[0066] Both the TD-OCC and FD-OCC of the Rel.15 NR DMRS correspond to an OCC with a sequence length (which may also be called the OCC length) = 2. Therefore, the possible values of k’ and l’ above are both 0 and 1. By multiplying this FD-OCC on a per-RE basis, two-port DMRS can be multiplexed using the same time and frequency resources (2RE). When both this FD-OCC and TD-OCC are applied, four-port DMRS can be multiplexed using the same time and frequency resources (4RE).

[0067] The two existing DMRS port tables for PDSCH mentioned above correspond to DMRS configuration types 1 and 2 respectively. Note that p indicates the antenna port number, and Δ indicates a parameter for shifting (offsetting) the frequency resource.

[0068] For example, for antenna ports 1000 and 1001, {wf (0), w f (1)} = {+1, +1} and {w f (0), w f (1)} = {+1, -1} is applied, and it is orthogonalized using FD - OCC.

[0069] For the antenna ports 1000 - 1001 and the antenna ports 1002 - 1003 (and in the case of type 2, also the antenna ports 1004 - 1005), different values of Δ are applied, and thus FDM is applied. Therefore, the antenna ports 1000 - 1003 (or 1000 - 1005) corresponding to the single - symbol DMRS are orthogonalized using FD - OCC and FDM.

[0070] For the type - 1 antenna ports 1000 - 1003 and the antenna ports 1004 - 1007, {w t (0), w t (1)} = {+1, +1} and {w t (0), w t (1)} = {+1, -1} is applied, and it is orthogonalized using TD - OCC. Therefore, the antenna ports 1000 - 1007 (or 1000 - 1011) corresponding to the double - symbol DMRS are orthogonalized using FD - OCC, TD - OCC, and FDM.

[0071] For CP - OFDM only, (without increasing the DMRS overhead,) defining a larger number of orthogonal DMRS ports for DL / UL MU - MIMO, making the design common between DL and UL DMRS, up to 24 orthogonal DMRS ports, doubling the maximum number of orthogonal DMRS ports for both single - symbol DMRS and double - symbol DMRS for each applicable DMRS setting type, is being considered.

[0072] In Rel.15, the following cases 1 to 4 can be set. [Case 1] Single - symbol DMRS of DMRS setting type 1 The total number of DMRS ports is 2 (by comb / FDM) × 2 (by FD OCC) = 4 ports. [Case 2] Double-symbol DMRS of DMRS setting type 1 The total number of DMRS ports is 2 (by comb / FDM) × 2 (by FD OCC) × 2 (by TD OCC) = 8 ports. [Case 3] Single-symbol DMRS of DMRS setting type 2 The total number of DMRS ports is 3 (by FDM) × 2 (by FD OCC) = 6 ports. [Case 4] Double-symbol DMRS of DMRS setting type 2 The total number of DMRS ports is 3 (by comb) × 2 (by FD OCC) × 2 (by TD OCC) = 12 ports.

[0073] Also, in Cases 1 to 4 of Rel.15, the mapping of the CDM group and the DMRS port index is as follows.

[0074] [Case 1] For 4 ports, 2 CDM groups may be available. For PUSCH, CDM group #0 may correspond to DMRS port indices {0,1}, and CDM group #1 may correspond to DMRS port indices {2,3}. For PDSCH, CDM group #0 may correspond to DMRS port indices {1000,1001}, and CDM group #1 may correspond to DMRS port indices {1002,1003}.

[0075] [Case 2] Eight ports and two CDM groups may be available. For PUSCH, CDM group #0 may correspond to DMRS port indices {0, 1, 4, 5}, and CDM group #1 may correspond to DMRS port indices {2, 3, 6, 7}. For PDSCH, CDM group #0 may correspond to DMRS port indices {1000, 1001, 1004, 1005}, and CDM group #1 may correspond to DMRS port indices {1002, 1003, 1006, 1007}.

[0076] [Case 3] Six ports and three CDM groups may be available. For PUSCH, CDM group #0 may correspond to DMRS port indices {0, 1}, CDM group #1 may correspond to DMRS port indices {2, 3}, and CDM group #2 may correspond to DMRS port indices {4, 5}. For PDSCH, CDM group #0 may correspond to DMRS port indices {1000, 1001}, CDM group #1 may correspond to DMRS port indices {1002, 1003}, and CDM group #2 may correspond to DMRS port indices {1004, 1005}.

[0077] [Case 4] Twelve ports and three CDM groups may be available. For PUSCH, CDM group #0 may correspond to DMRS port indices {0, 1, 6, 7}, CDM group #1 may correspond to DMRS port indices {2, 3, 8, 9}, and CDM group #2 may correspond to DMRS port indices {4, 5, 10, 11}. For PDSCH, CDM group #0 may correspond to DMRS port indices {1000, 1001, 1006, 1007}, CDM group #1 may correspond to DMRS port indices {1002, 1003, 1008, 1009}, and CDM group #2 may correspond to DMRS port indices {1004, 1005, 1010, 1011}.

[0078] <Table of Antenna Ports in Rel.15> Figures 1A - 1D are diagrams showing examples of tables of reference antenna ports when the transform precoder in Rel. 15 is invalid, DMRS type = 1, and the maximum length of DMRS = 1.

[0079] Figure 1A 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 from 0 to 5, respectively.

[0080] Figure 1B is an example of a table of antenna ports corresponding to rank 2. In this example, different sets of DMRS ports (number of antenna ports 2) are associated with the values of the antenna port field from 0 to 3, respectively.

[0081] Figure 1C is an example of a table of antenna ports corresponding to rank 3. In this example, different sets of DMRS ports (number of antenna ports 3) are associated with the value of the antenna port field = 0.

[0082] Figure 1D is an example of a table of antenna ports corresponding to rank 4. In this example, different sets of DMRS ports (number of antenna ports 4) are associated with the value of the antenna port field = 0.

[0083] Figures 2A - 2D are diagrams showing examples of tables of reference antenna ports when the transform precoder in Rel. 15 is invalid, DMRS type = 1, and the maximum length of DMRS = 2.

[0084] Figure 2A 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 from 0 to 13, respectively. Note that the correspondence between the values and the contents of the entries is not limited to this. The same applies to other examples.

[0085] Figure 2B is an example of a table of antenna ports corresponding to Rank 2. In this example, different sets of DMRS ports (number of antenna ports: 2) are associated with the values = 0 to 9 in the antenna port field, respectively.

[0086] Figure 2C is an example of a table of antenna ports corresponding to Rank 3. In this example, different sets of DMRS ports (number of antenna ports: 3) are associated with the values = 0 to 2 in the antenna port field, respectively.

[0087] Figure 2D is an example of a table of antenna ports corresponding to Rank 4. In this example, different sets of DMRS ports (number of antenna ports: 4) are associated with the values = 0 to 3 in the antenna port field, respectively.

[0088] Figures 3A - 3D are diagrams showing examples of tables of reference antenna ports when the transform precoder in Rel.15 is invalid, the DMRS type = 2, and the maximum length of the DMRS = 1.

[0089] Figure 3A 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 = 0 to 11 in the antenna port field, respectively. Note that the correspondence between the values and the contents of the entries is not limited to this. The same applies to other examples.

[0090] Figure 3B is an example of a table of antenna ports corresponding to Rank 2. In this example, different sets of DMRS ports (number of antenna ports: 2) are associated with the values = 0 to 6 in the antenna port field, respectively.

[0091] Figure 3C is an example of a table of antenna ports corresponding to Rank 3. In this example, different sets of DMRS ports (number of antenna ports: 3) are associated with the values = 0 to 2 in the antenna port field, respectively.

[0092] Figure 3D is an example of a table of antenna ports corresponding to rank 4. In this example, different sets of DMRS ports (number of antenna ports: 4) are associated corresponding to values of the antenna port field from 0 to 1.

[0093] Figures 4A, 4B, 5A, and 5B are diagrams showing examples of tables of antenna ports to be referenced when the transform precoder in Rel. 15 is invalid, the DMRS type = 2, and the maximum length of DMRS = 2.

[0094] Figure 4A 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 corresponding to values of the antenna port field from 0 to 27.

[0095] Figure 4B is an example of a table of antenna ports corresponding to rank 2. In this example, different sets of DMRS ports (number of antenna ports: 2) are associated corresponding to values of the antenna port field from 0 to 18.

[0096] Figure 5A is an example of a table of antenna ports corresponding to rank 3. In this example, different sets of DMRS ports (number of antenna ports: 3) are associated corresponding to values of the antenna port field from 0 to 5.

[0097] Figure 5B is an example of a table of antenna ports corresponding to rank 4. In this example, different sets of DMRS ports (number of antenna ports: 4) are associated corresponding to values of the antenna port field from 0 to 4.

[0098] <DMRS ports for layer numbers greater than 4 layers> An example of a table of antenna ports for DMRS port indication for layer numbers greater than 4 layers when the transform precoder is invalid will be described.

[0099] 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.

[0100] Then, the UE may determine the table of antenna ports corresponding to the determined rank based on the enable / disable of the transform precoder, the DMRS type of PUSCH set by upper layer signaling (which may be set by the RRC parameter "dmrs-Type") and the value of the maximum length of DMRS (which may be set by the RRC parameter "maxLength").

[0101] Also, the value of the antenna port field in the DCI may determine the entry of the table to be referred to (the entry corresponds to a set such as the number of CDM groups, the antenna port index of DMRS, the number of previous symbols ("Number of front-load symbols"), etc.).

[0102] [When DMRS type = 1 and maximum length of DMRS = 1] When DMRS type = 1 and maximum length of DMRS = 1, transmissions up to rank 4 may be supported. In other words, a UE configured with DMRS type = 1 and maximum length of DMRS = 1 may not support transmissions larger than rank 4.

[0103] [When DMRS type = 1 and maximum length of DMRS = 2] When DMRS type = 1 and maximum length of DMRS = 2, transmissions up to rank 8 may be supported.

[0104] Figures 6A - 6D are diagrams showing an example of the table of antenna ports to be referred to when the transform precoder is disabled, DMRS type = 1, and maximum length of DMRS = 2.

[0105] FIG. 6A 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 = 0 to 3 of the antenna port field, respectively. Note that the correspondence between the values and the contents of the entries is not limited to this. The same applies to other examples.

[0106] In FIG. 6A, 2+3 layers and 3+2 layers may be supported. Note that only some of the illustrated entries 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, 6 may be supported for 3+2 layers.

[0107] FIG. 6B is an example of a table of antenna ports corresponding to rank 6. In this example, different sets of DMRS ports (number of antenna ports 6) are associated with the values = 0 to 2 of the antenna port field, respectively.

[0108] In FIG. 6B, 4+2 layers, 2+4 layers, and 3+3 layers may be supported. Note that only a specific combination of X and Y for X+Y layers (e.g., 3+3) may be supported.

[0109] FIG. 6C is an example of a table of antenna ports corresponding to rank 7. In this example, different sets of DMRS ports (number of antenna ports 7) are associated with the values = 0 to 1 of the antenna port field, respectively.

[0110] In FIG. 6C, 4+3 layers and 3+4 layers may be supported.

[0111] FIG. 6D is an example of a table of antenna ports corresponding to rank 8. In this example, a set of DMRS ports (number of antenna ports 8) is associated with the value = 0 of the antenna port field.

[0112] In FIG. 6D, only 4 + 4 layers may be supported.

[0113] [When DMRS type = 2 and the maximum length of DMRS = 1] When DMRS type = 2 and the maximum length of DMRS = 1, transmission up to rank 6 may be supported, or only transmission up to rank 4 may be supported, or transmission of rank 6 (e.g., 4 + 2 layers) may not be supported and only transmission up to rank 5 may be supported.

[0114] FIGS. 7A and 7B are diagrams showing examples of tables of reference antenna ports when the transform precoder is invalid, DMRS type = 2, and the maximum length of DMRS = 1.

[0115] FIG. 7A is an example of a table of antenna ports corresponding to rank 5. In this example, a set of DMRS ports (number of antenna ports 5) is associated with the value = 0 of the antenna port field.

[0116] FIG. 7B is an example of a table of antenna ports corresponding to rank 6. In this example, a set of DMRS ports (number of antenna ports 6) is associated with the value = 0 of the antenna port field.

[0117] [When DMRS type = 2 and the maximum length of DMRS = 2] When DMRS type = 2 and the maximum length of DMRS = 2, transmission up to rank 8 may be supported.

[0118] FIGS. 8A - 8D are diagrams showing examples of tables of reference antenna ports when the transform precoder is invalid, DMRS type = 2, and the maximum length of DMRS = 2.

[0119] FIG. 8A 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 corresponding to values = 0 to 2 of the antenna port field.

[0120] FIG. 8B is an example of a table of antenna ports corresponding to rank 6. In this example, different sets of DMRS ports (number of antenna ports 6) are associated corresponding to values = 0 to 3 of the antenna port field.

[0121] In FIG. 8B, 4 + 2 layer, 2 + 4 layer, and 3 + 3 layer may be supported. Note that only a specific combination of X, Y for X + Y layer (for example, 3 + 3) may be supported. For example, only the entry corresponding to the value = 3 of the antenna port field in FIG. 8B may be supported for 3 + 3.

[0122] FIG. 8C is an example of a table of antenna ports corresponding to rank 7. In this example, different sets of DMRS ports (number of antenna ports 7) are associated corresponding to values = 0 to 2 of the antenna port field.

[0123] FIG. 8D is an example of a table of antenna ports corresponding to rank 8. In this example, sets of DMRS ports (number of antenna ports 8) are associated corresponding to values = 0 to 2 of the antenna port field.

[0124] Regarding FIG. 8D, only the entry corresponding to the 4 + 4 layer may be supported.

[0125] According to the DMRS port indication with a layer number greater than 4 described above, for PUSCH using a layer number greater than 4 when the transform precoder is invalid, the antenna ports can be appropriately specified.

[0126] (Analysis) However, although examples of DMRS ports with a layer number greater than 4 layers have been described, the DMRS port indication with a layer number greater than 4 layers for 2 codewords has not been considered. Also, there is room for further consideration regarding the table of DMRS port indications with a layer number greater than 4 layers. Further, the restrictions (conditions) on DMRS settings for PUSCH with a layer number greater than 4 layers have not been fully considered.

[0127] Also, regarding whether the increased number of DMRS ports is applied to high-rank (large layer) PUSCH, it has not been fully considered. If these considerations are insufficient, UL transmission with a layer number greater than 4 may not be properly executed, and there is a risk of a decrease in communication throughput.

[0128] Therefore, the inventors have conceived a method for properly performing UL transmission with a layer number greater than 4.

[0129] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to the respective embodiments may be applied individually or in combination.

[0130] In the present disclosure, "A / B" and "at least one of A and B" may be read interchangeably. Also, in the present disclosure, "A / B / C" may mean "at least one of A, B, and C".

[0131] In the present disclosure, activate, deactivate, indicate (or specify), select, configure, update, determine, etc. may be read interchangeably. In the present disclosure, support, control, be able to control, operate, be able to operate, etc. may be read interchangeably.

[0132] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, upper layer parameters, information elements (IEs), configurations, etc. may be read as each other. In the present disclosure, Medium Access Control control elements (MAC Control Elements (CEs)), update commands, activation / deactivation commands, etc. may be read as each other.

[0133] In the present disclosure, upper layer signaling may be any one of, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0134] In the present disclosure, MAC signaling may use, for example, MAC control elements (MAC Control Elements (MAC CEs)), MAC Protocol Data Units (PDUs), etc. Broadcast information may be, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0135] In the present disclosure, physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), etc.

[0136] In the present disclosure, an index, an identifier (Identifier (ID)), an indicator, a resource ID, a number, etc. may be read interchangeably with each other. In the present disclosure, a sequence, a list, a set, a group, a cluster, a subset, etc. may be read interchangeably with each other.

[0137] In the present disclosure, the description "Rel.XX" indicates the release of 3GPP. However, the release number "XX" is an example and may be replaced with other numbers.

[0138] In the present disclosure, DMRS, DL DMRS, UL DMRS, PDSCH DMRS, PUSCH DMRS may be read interchangeably with each other.

[0139] In the present disclosure, an orthogonal sequence, OCC, FD OCC, TD OCC may be read interchangeably with each other.

[0140] In the present disclosure, drop, abort, cancel, puncture, rate match, postpone, etc. may be read interchangeably with each other.

[0141] In the present disclosure, a DMRS port, an antenna port, a port, a DMRS port index may be read interchangeably with each other. In the present disclosure, a DMRS CDM group, a CDM group, a DMRS group, a DMRS CDM group(s) without data may be read interchangeably with each other. In the present disclosure, an antenna port indication, an antenna port field may be read interchangeably with each other. In the present disclosure, a DMRS configuration type, a DMRS type may be read interchangeably with each other. In the present disclosure, the maximum length of DMRS, the number of symbols of DMRS may be read interchangeably with each other.

[0142] In the present disclosure, a CDM group list, a list may be read interchangeably with each other. In the present disclosure, a CDM group subset, a group subset may be read interchangeably with each other.

[0143] In the present disclosure, rank, transmission rank, number of layers, and number of antenna ports may be read interchangeably with each other. The application of one codeword and the number of layers being 4 layers or less may be read interchangeably with each other. The application of two codewords and the number of layers being greater than 4 layers may be read interchangeably with each other.

[0144] (Wireless communication method) <First Embodiment> [Case where the number of layers is 4 layers or less] The table indicating the antenna ports for Rel.15 PUSCH described in FIGS. 1-5 is applicable in the case of one codeword (when codeword 0 is valid, codeword 1 is invalid, and the number of layers is 4 layers or less).

[0145] When two codewords are set for multi-panel UL simultaneous transmission, the UE may apply the existing table of PUSCH in FIGS. 1-5 even if the supported rank is 4 or less.

[0146] When two codewords are set, if the rank indicated by dynamic scheduling is 4 or less, the UE may apply the existing table for PUSCH in FIGS. 1-5.

[0147] [Case where the number of layers is greater than 4] The UE receives an antenna port indication (for example, an indication using the antenna port indication table for PUSCH shown in FIGS. 6-8) when at least one of the DMRS type and the maximum length of the DMRS is not 1, and based on the indication, controls (transmits UL) UL transmission using two codewords (codeword 0 and codeword 1) with a number of layers greater than 4.

[0148] According to the first embodiment, even when the number of layers is greater than 4, UL transmission can be appropriately controlled using the antenna port indication table for PUSCH.

[0149] <Second Embodiment> In FIGS. 6 - 8, an example of a table of antenna ports for DMRS port indication with a layer number greater than 4 when the transform precoder is invalid is shown. However, entries may be added to cover all possible layer distributions between two codewords. The number of bits of the antenna port field in DCI may be 4 bits in FIGS. 6 and 7, and 5 bits in FIG. 8. The same number of bits may also be used in this embodiment. In the present disclosure, the DMRS CDM group may be rewritten as a DMRS CDM group(s) without data.

[0150] [Addition of Entries in Case 2] In the case of Case 2 (DMRS type = 1, maximum length of DMRS = 2), the UE may control UL (e.g., PUSCH) transmission such 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.

[0151] [[Rank 5]] When Case 2 is applied as the DMRS configuration, entries based on at least one of the following principles may be further added to FIG. 6A corresponding to Rank 5.

[0152] (1) It includes four DMRS port indexes corresponding to DMRS CDM group #0 and one DMRS port index corresponding to DMRS CDM group #1. (2) It includes one DMRS port index corresponding to DMRS CDM group #0 and four DMRS port indexes corresponding to DMRS CDM group #1. (3) It includes three DMRS port indexes corresponding to DMRS CDM group #0 and two DMRS port indexes corresponding to DMRS CDM group #1. (4) Two DMRS port indexes corresponding to DMRS CDM group #0 and three DMRS port indexes corresponding to DMRS CDM group #1 are included.

[0153] [[Rank 6]] For the DMRS configuration, case 2 is applied, and in FIG. 6B corresponding to rank 6, an entry based on at least one of the following principles may be further added. The example in FIG. 6B is an example corresponding to the following principles.

[0154] (1) Four DMRS port indexes corresponding to DMRS CDM group #0 and two DMRS port indexes corresponding to DMRS CDM group #1 are included. (2) Two DMRS port indexes corresponding to DMRS CDM group #0 and four DMRS port indexes corresponding to DMRS CDM group #1 are included. (3) Three DMRS port indexes corresponding to DMRS CDM group #0 and three DMRS port indexes corresponding to DMRS CDM group #1 are included.

[0155] [[Rank 7]] For the DMRS configuration, case 2 is applied, and in FIG. 6C corresponding to rank 7, an entry based on at least one of the following principles may be further added. The example in FIG. 6C is an example corresponding to the following principles.

[0156] (1) Four DMRS port indexes corresponding to DMRS CDM group #0 and three DMRS port indexes corresponding to DMRS CDM group #1 are included. (2) Three DMRS port indexes corresponding to DMRS CDM group #0 and four DMRS port indexes corresponding to DMRS CDM group #1 are included.

[0157] [[Rank 8]] Case 2 is applied as the DMRS configuration, and in FIG. 6D corresponding to rank 8, an entry based on at least one of the following principles may be further added. The example of FIG. 6D is an example corresponding to the following principles.

[0158] (1) It includes four DMRS port indexes corresponding to DMRS CDM group #0 and four DMRS port indexes corresponding to DMRS CDM group #1.

[0159] [Addition of entry in Case 3] In the case of Case 3 (DMRS type = 2, maximum length of DMRS = 1), the UE may control UL (e.g., PUSCH) transmission such 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 is equal to the rank number.

[0160] [[Rank 5]] Case 3 is applied as the DMRS configuration, and in FIG. 7A corresponding to rank 5, an entry based on the following principle may be further added. That is, the example of FIG. 7A may include four DMRS port indexes corresponding to two DMRS CDM groups and one DMRS port index corresponding to one DMRS CDM group.

[0161] (1) It 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. (2) It 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.

[0162] [[Rank 6]] As the DMRS configuration, Case 3 is applied, and an entry based on the principle that Figure 7B corresponding to Rank 6 includes six DMRS port indexes corresponding to three DMRS CDM groups may be further added. The example in Figure 7B is an example corresponding to the following principle.

[0163] [Addition of Entries in Case 4] In the case of Case 4 (DMRS type = 2, maximum length of DMRS = 2), the UE may control UL (e.g., PUSCH) transmission such 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 is equal to the rank number.

[0164] [[Rank 5]] As the DMRS configuration, Case 4 (DMRS type = 2, maximum length of DMRS = 2) is applied, and an entry based on the following principle may be further added to Figure 8A corresponding to Rank 5.

[0165] (1) It includes four DMRS port indexes corresponding to one DMRS CDM group and one DMRS port index corresponding to another DMRS CDM group. (2) It includes three DMRS port indexes corresponding to one DMRS CDM group and two DMRS port indexes corresponding to another DMRS CDM group. (3) It includes two DMRS port indexes corresponding to one (first) DMRS CDM group, two DMRS port indexes corresponding to another (second) DMRS CDM group, and one DMRS port index corresponding to another (third) DMRS CDM group. (4) Three DMRS port indexes corresponding to one (first) DMRS CDM group, one DMRS port index corresponding to another (second) DMRS CDM group, and one DMRS port index corresponding to another (third) DMRS CDM group are included.

[0166] [[Rank 6]] As the DMRS configuration, Case 4 (DMRS type = 2, maximum length of DMRS = 2) is applied, and entries based on the following principles may be further added to FIG. 8B corresponding to Rank 6.

[0167] (1) Four DMRS port indexes corresponding to one DMRS CDM group and two DMRS port indexes corresponding to another DMRS CDM group are included. (2) Three DMRS port indexes corresponding to one DMRS CDM group and three DMRS port indexes corresponding to another DMRS CDM group are included. (3) Two DMRS port indexes corresponding to one (first) DMRS CDM group, two DMRS port indexes corresponding to another (second) DMRS CDM group, and two DMRS port indexes corresponding to another (third) DMRS CDM group are included. (4) Three DMRS port indexes corresponding to one (first) DMRS CDM group, two DMRS port indexes corresponding to another (second) DMRS CDM group, and one DMRS port index corresponding to another (third) DMRS CDM group are included. (5) Four DMRS port indexes corresponding to one (first) DMRS CDM group, one DMRS port index corresponding to another (second) DMRS CDM group, and one DMRS port index corresponding to another (third) DMRS CDM group are included.

[0168] [[Rank 7]] For the DMRS configuration, Case 4 (DMRS type = 2, maximum length of DMRS = 2) is applied, and entries based on the following principles may be further added to FIG. 8C corresponding to Rank 7.

[0169] (1) It includes four DMRS port indexes corresponding to one DMRS CDM group and three DMRS port indexes corresponding to another DMRS CDM group. (2) It includes four DMRS port indexes corresponding to one (first) DMRS CDM group, two DMRS port indexes corresponding to another (second) DMRS CDM group, and one DMRS port index corresponding to another (third) DMRS CDM group. (3) It includes three DMRS port indexes corresponding to one (first) DMRS CDM group, three DMRS port indexes corresponding to another (second) DMRS CDM group, and one DMRS port index corresponding to another (third) DMRS CDM group. (4) It includes three DMRS port indexes corresponding to one (first) DMRS CDM group, two DMRS port indexes corresponding to another (second) DMRS CDM group, and two DMRS port indexes corresponding to another (third) DMRS CDM group.

[0170] [[Rank 8]] For the DMRS configuration, Case 4 (DMRS type = 2, maximum length of DMRS = 2) is applied, and entries based on the following principles may be further added to FIG. 8D corresponding to Rank 8.

[0171] (1) It includes four DMRS port indexes corresponding to one DMRS CDM group and four DMRS port indexes corresponding to another DMRS CDM group. (2) Four DMRS port indexes corresponding to one (first) DMRS CDM group, three DMRS port indexes corresponding to another one (second) DMRS CDM group, and one DMRS port index corresponding to another one (third) DMRS CDM group are included. (3) Four DMRS port indexes corresponding to one (first) DMRS CDM group, two DMRS port indexes corresponding to another one (second) DMRS CDM group, and two DMRS port indexes corresponding to another one (third) DMRS CDM group are included. (4) Three DMRS port indexes corresponding to one (first) DMRS CDM group, three DMRS port indexes corresponding to another one (second) DMRS CDM group, and two DMRS port indexes corresponding to another one (third) DMRS CDM group are included.

[0172] According to the second embodiment, even when at least one of the DMRS type and the maximum length of the DMRS is not 1, UL transmission can be appropriately controlled using the antenna port indication table for PUSCH.

[0173] <The Third Embodiment> The UE may receive an instruction (e.g., antenna port indication) regarding UL (e.g., PUSCH) transmission and perform UL transmission using a layer number greater than 4 based on at least one of the following conditions. For example, when the UE satisfies at least one of the following conditions, UL transmission using a layer number greater than 4 is set / instructed, and when the UE does not satisfy at least one of the following conditions, UL transmission using a layer number greater than 4 may not be set / instructed. Also, when the UE satisfies at least one of the following conditions, UL transmission using a layer number greater than 4 is performed, and when the UE does not satisfy at least one of the following conditions, UL transmission using a layer number greater than 4 may be dropped. The following conditions may be predefined in the specification or may be restricted / set according to the corresponding UE's capability report.

[0174] FIG. 9 is a flowchart showing an example of the processing of the third embodiment. When the UE satisfies a condition (for example, at least one of the following conditions) (YES in step S01), the UE performs UL transmission using a layer number greater than 4 (step S02). In this case, the UE may receive a setting / indication regarding UL transmission using a layer number greater than 4 before step S02.

[0175] [Condition 1] The UE has 6 transmit antennas (6TX) or 8 transmit antennas (8TX) (codebook setting for 6TX UL or 8TX UL). The UE may report the number of transmit antennas (at least one of 6 or 8) for PUSCH (codebook-based / non-codebook-based) / SRS as UE capabilities.

[0176] [Condition 2] The set maximum rank of UL is greater than 4. In this case, the number of transmit antennas may be set in higher layer signaling (for example, PUSCH setting (PUSCH Config) / SRS setting (SRS Config) of the RRC information element). When set in the SRS setting, it may be set for each SRS resource / SRS resource set.

[0177] [Condition 3] A specific UL DCI format (for example, DCI format 0_1 / 0_2) is applied. For example, a PUSCH with more than 4 layers can be set only to DCI format 0_1 (or 0_2), and may not be supported by DCI format 0_2 (or 0_1). Different settings may be made for DCI format 0_1 and DCI format 0_2 for a PUSCH with more than 4 layers.

[0178] [Condition 4] Dynamic scheduling (scheduling by DCI) or configured grant is applied. For example, a PUSCH with more than 4 layers can only be configured for dynamic scheduling and may not be supported by configured grant. Different configurations may be set for each PUSCH of the configured grant compared to dynamic scheduling.

[0179] [Condition 5] Transmission of a specific type of PUSCH (e.g., Message 3 / Message A PUSCH, Message 3 / Message A PUSCH in contention based random access (CBRA) or contention free random access (CFRA), or a PUSCH triggered by a specific purpose, etc.) is performed. The specific purpose may be, for example, the transmission of UCI (HARQ-ACK / CSI / SR). For example, in the case of a Message 3 / Message A PUSCH (a PUSCH scheduled by a Random Access Response (RAR) UL grant), a layer number greater than 4 may not be supported.

[0180] [Condition 6] Repetition of the PUSCH is configured. For example, for a PUSCH with more than 4 layers, repeated transmission may not be configurable (or may be configurable).

[0181] [Condition 7] There is (or is not) support / enable / configuration / scheduling for multi-panel UL simultaneous transmission. For example, it may be a condition that UE capability information indicating support for multi-panel UL simultaneous transmission has been transmitted (or has not been transmitted). For example, if UL simultaneous transmission is configured / scheduled, a PUSCH with more than 4 layers may not be supported.

[0182] According to the third embodiment, UL (e.g., PUSCH) transmission using a layer number greater than 4 can be appropriately restricted / configured using the above conditions.

[0183] <Embodiment 4> As described above, the total number of DMRS ports in Rel. 15 is 4 ports in Case 1, 8 ports in Case 2, 6 ports in Case 3, and 12 ports in Case 4. In future wireless communication systems (e.g., after Rel. 18), for example, in Case 1 it may increase to 8 ports, in Case 2 to 16 ports, in Case 3 to 12 ports, and in Case 4 to 24 ports. Hereinafter, these numbers of ports may be referred to as "increased DMRS port numbers". Note that the increased DMRS port numbers are not limited to the above examples. In the present disclosure, the DMRS port, the DMRS port number, and the number of DMRS ports may be read interchangeably with each other.

[0184] The UE may receive a setting regarding the number of DMRS ports that varies according to at least one of the number of layers (Option 1, 3) and the UE capability (Option 2), and control UL transmission (e.g., PUSCH) based on the setting.

[0185] [Option 1] The setting regarding the increased DMRS port number may not be applicable to UL PUSCH with more than 4 layers. That is, it may be assumed that the two settings (the setting of the number of DMRS ports in Rel. 15 described above and the setting of the increased DMRS port number) cannot be set in the UE simultaneously. The setting regarding the increased DMRS port number may be set only for UL PUSCH with 4 layers or less.

[0186] [Option 2] Depending on the UE capability (report of UE capability information), the setting regarding the increased DMRS port number may be applicable to UL PUSCH with more than 4 layers. That is, the two settings (the setting of the DMRS port in Rel. 15 described above and the setting of the increased DMRS port number) may be set in the UE simultaneously.

[0187] [Option 3] The setting related to the increased number of DMRS ports may be applicable only to Case 1 / Case 3 where the number of layers is at most 6 or 8 layers. That is, the setting related to the increased number of DMRS ports may be performed only when Case 1 / Case 3 is set for the UE. In Case 2 / Case 4 / Case 3, since the existing maximum number of ports can sufficiently handle 6 or 8 layers, the setting related to the increased DMRS ports may not be performed.

[0188] The increased number of DMRS ports for UL greater than 4 layers may be applied only when at least one of the conditions shown in the third embodiment is satisfied, or may be applied based on other conditions restricted / set according to the corresponding UE's capability report.

[0189] According to the fourth embodiment, the UE can appropriately restrict / set the setting related to the increased number of DMRS ports. For example, the UE can suppress receiving unnecessary settings.

[0190] <The Fifth Embodiment> As shown in Examples 5-1 to 5-3 described later, a new concept of a CDM group list may be introduced on top of the CDM group.

[0191] For example, two lists are shown, and for the DMRS ports of each list, the order of the CDM groups in the existing DMRS port table (e.g., FIGS. 1-5) may be reused. For the second list, the DMRS port index j in the DMRS port table may mean j+P. Here, P may 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 mean k+Q. Here, Q may be the number of DMRS CDM groups in the list (the maximum number of DMRS CDM groups in the list).

[0192] As shown in Examples 5-4 to 5-6 described below, a new concept of a CDM group subset may be introduced under the CDM group.

[0193] For example, for each group subset, the order of the CDM groups in the existing DMRS port table (e.g., FIGS. 1-5) may be reused. For the second group subset, the DMRS port index j in the DMRS port table may mean j + P. Here, P may 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 mean j.

[0194] The proposals in Examples 5-1 to 5-6 described below are also applicable to the antenna port indication tables of ranks 5 to 8. The new rank 5 to 8 antenna port indication table may be interpreted for each list or each CDM group subset as described above.

[0195] [Example 5-1] This embodiment relates to the mapping of CDM groups and DMRS ports.

[0196] A new concept of a CDM group list (list) may be introduced above the CDM group. The number of CDM groups and the CDM group order for each CDM group list may follow the existing DMRS port table. The CDM group list may support at least one of the following cases 1-1 to 1-4.

[0197] [[Case 1-1]] Eight ports may be available. Two CDM group lists may be available. There may be two CDM groups for each CDM group list. There may be two DMRS ports for each CDM group. List #1 may include the CDM groups {0, 1}, and list #2 may include the CDM groups {2, 3}.

[0198] [[Case 1-2]] 16 ports may be available. 2 CDM group lists may be available. There may be 2 CDM groups for each CDM group list. There may be 4 DMRS ports for each CDM group. List #1 may include CDM groups {0,1}, and list #2 may include CDM groups {2,3}.

[0199] [[Case 1-3]] 12 ports may be available. 2 CDM group lists may be available. There may be 3 CDM groups for each CDM group list. There may be 2 DMRS ports for each CDM group. List #1 may include CDM groups {0,1,2}, and list #2 may include CDM groups {3,4,5}.

[0200] [[Case 1-4]] 24 ports may be available. 2 CDM group lists may be available. There may be 3 CDM groups for each CDM group list. There may be 4 DMRS ports for each CDM group. List #1 may include CDM groups {0,1,2}, and list #2 may include CDM groups {3,4,5}.

[0201] For the DMRS ports for each list, the order of the CDM groups in the existing DMRS port table may be reused. For the second list, the DMRS port index j in the DMRS port table may mean j+P. Here, P may 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 mean k+Q. Here, Q may be the number of DMRS CDM groups in the list (the maximum number of DMRS CDM groups in the list).

[0202] [Example 5-2] This example relates to the reuse of the existing antenna port table for PUSCH. This example may assume that Example 5-1 is used.

[0203] A new field (list indication field) for indicating at least one of whether to apply one list or one list (number of lists, number of lists for rate matching) and the list index for the scheduled PUSCH may be added to DCI format 0_1 / 0_2 (which schedules the PUSCH). For antenna port indication, the existing antenna port table may be reused for each list.

[0204] When the new field indicates one list, the existing antenna port table and the DMRS port index for antenna port indication may be used. By default, the one list may be the first list. When the new field indicates one list, the UE may not transmit data on the REs indicated by the DMRS REs in the first list (rate matching may be performed around the REs indicated by the DMRS REs in the first list for the PUSCH). When the antenna port field indicates a row with the number of CDM groups x, not transmitting data on the REs indicated by the DMRS REs in the first list may mean rate matching at all DMRS ports within the x CDM groups in the first list.

[0205] Whether data is mapped to the REs not used for DMRS may be indicated by the DCI (which schedules 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.

[0206] The number of lists may be set by upper layer signaling. Other parameters such as the maximum number of DMRS ports and the maximum number of DMRS CDM groups may be set by upper layer signaling, and the UE may determine the number of lists based on those parameters.

[0207] When one list is indicated, it may mean that the user multiplexed with the UE for which the PUSCH / PDSCH is scheduled occupies only the DMRS ports within one list (by default, list #1). The UE may perform rate matching around the DMRS REs within one list. When two lists are indicated, it may mean that the user multiplexed with the UE for which the PUSCH / PDSCH is scheduled occupies the DMRS ports within two lists. The UE may perform rate matching around the DMRS REs within two lists.

[0208] When the new field indicates one list, the new field may include a list index. When the new field indicates one list and a list index, the one list may be the list corresponding to the list index.

[0209] When the new field indicates two lists (list #1 and #2), the new field may include a list index.

[0210] When the second list is indicated by the list index, in the antenna port table, the indicated DMRS port index j may be regarded as DMRS port j + P. Here, P may be the maximum number of DMRS ports per list (the maximum number). The number of DMRS CDM groups without data {1, 2, 3} may refer to the CDM groups within the second list.

[0211] When the first list is indicated by the list index, in the antenna port table, the indicated DMRS port index j may be DMRS port j. The number of DMRS CDM groups without data {1, 2, 3} may refer to the CDM groups in the first list.

[0212] When the new field indicates two lists, the UE may not need to transmit data on the REs indicated by the DMRS REs in the two lists. The UE may follow either of the following rate matchings 1 and 2. [[Rate matching 1]] The UE performs rate matching around the DMRS REs in all DMRS ports within those two lists. [[Rate matching 2]] The UE performs rate matching around the DMRS REs in all DMRS ports in the first list and in 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 be added (to that DCI). The additional field may be applied only when the DMRS RE positions of the j-th port in the two lists are different. When the second list is indicated by the list index, the additional field is not required, and the UE may follow the antenna port field for the number of CDM groups for rate matching. When the first list is indicated by the list index, the additional field is valid, and the UE may follow the indicated number of CDM groups for rate matching.

[0213] For example, the value of the new field may indicate the following. · Value 00 may indicate one list for rate matching and the antenna port indication for its DMRS (within the default list #1). · Value 01 may indicate two lists for rate matching and the antenna port indication in List #1 for its DMRS. · Value 10 may indicate two lists for rate matching and the antenna port indication in List #2 for its DMRS. · Value 11 may be reserved.

[0214] As a variation, even if only one list is indicated, a list index may be required. For example, the value of the new field may indicate the following. · Value 00 may indicate one list for rate matching and the antenna port indication in List #1 for its DMRS. · Value 01 may indicate one list for rate matching and the antenna port indication in List #2 for its DMRS. · Value 10 may indicate two lists for rate matching and the antenna port indication in List #1 for its DMRS. · Value 11 may indicate two lists for rate matching and the antenna port indication in List #2 for its DMRS.

[0215] [Example 5-3] For example, in the example of the existing antenna port table (Figure 1) for PUSCH, DMRS configuration type 1, DMRS maximum length = 1, and rank = 1, the interpretation of the existing antenna port table may follow the following. · In List #1, the number of DMRS CDM groups 1, 2 without data may respectively refer to CDM groups {0}, {0, 1}. · In List #2, the number of DMRS CDM groups 1, 2 without data may respectively refer to CDM groups {2}, {2, 3} in List #2. · If two lists are specified and list #2 is specified, the port index j may mean the j-th port within list #2. In case 1, the port index j may be index j+P = j+4 within list #2. For list #2, DMRS ports 0, 1, 2, 3 may be interpreted as DMRS ports 4, 5, 6, 7 respectively.

[0216] According to this Example 5-3, the DMRS ports can be increased without changing the antenna port table.

[0217] [Example 5-4] This example relates to the mapping of the CDM group and the DMRS ports.

[0218] A new concept of a CDM group subset (group subset) may be introduced under the CDM group. The number of CDM groups and the CDM group order for each CDM group subset may follow the existing DMRS port table. The CDM group subset may support at least one of the following cases 4-1 to 4-4.

[0219] [[Case 4-1]] 8 ports may be available. 2 CDM groups may be available. There may be 2 group subsets for each CDM group. 4 DMRS ports may correspond to each CDM group. Each of group subsets #1 and #2 may correspond to CDM groups {0, 1}.

[0220] [[Case 4-2]] 16 ports may be available. 2 CDM groups may be available. There may be 2 group subsets for each CDM group. 8 DMRS ports may correspond to each CDM group. Each of group subsets #1 and #2 may correspond to CDM groups {0, 1}.

[0221] [[Case 4-3]] 12 ports may be available. 3 CDM groups may be available. There may be 2 group subsets per CDM group. 4 DMRS ports may be supported per CDM group. Each of group subsets #1 and #2 may correspond to CDM groups {0, 1, 2}.

[0222] [[Case 4-4]] 24 ports may be available. 3 CDM groups may be available. There may be 2 group subsets per CDM group. 8 DMRS ports may be supported per CDM group. Each of group subsets #1 and #2 may correspond to CDM groups {0, 1, 2}.

[0223] For each group subset, the order of the CDM groups in the existing DMRS port table may be reused. For the second group subset, the DMRS port index j in the DMRS port table may mean j + P. Here, P may 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 mean j.

[0224] [Example 5-5] This example relates to the reuse of the existing antenna port table.

[0225] A new field (group subset indication field) may be added to DCI format 0_1 / 0_2 / 1_1 / 1_2 (that schedules the PUSCH / PDSCH) to indicate at least one of whether to apply one group subset or one group subset (number of group subsets, number of group subsets for rate matching) for the scheduled PUSCH / PDSCH, and the group subset index. For antenna port indication, the existing antenna port table may be reused for each group subset.

[0226] If the new field indicates one group subset, the existing antenna port table and the DMRS port index for antenna port indication may be used. By default, the one group subset may be the first group subset. If the new field indicates one group subset, the UE may not transmit / receive data on the REs indicated by the DMRS REs within the first group subset (rate matching may be performed around the REs indicated by the DMRS REs within the first group subset for that PUSCH / PDSCH). If the antenna port field indicates a row with the number of CDM groups x, not transmitting / receiving data on the REs indicated by the DMRS REs within the first group subset may mean rate matching at all the DMRS ports within the x CDM groups within the first group subset.

[0227] Whether data is mapped to the REs not used for DMRS may be indicated by DCI (scheduling that 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.

[0228] The number of group subsets may be set by higher layer signaling. Other parameters such as the maximum number of DMRS ports and the maximum number of DMRS CDM groups may be set by higher layer signaling, and the UE may determine the number of group subsets based on those parameters.

[0229] When one group subset is indicated, it may mean that the user multiplexed with the UE for which the PUSCH / PDSCH is scheduled occupies only the DMRS ports within one group subset (by default group subset #1). The UE may perform rate matching around the DMRS REs within one group subset. When two group subsets are indicated, it may mean that the user multiplexed with the UE for which the PUSCH / PDSCH is scheduled occupies the DMRS ports within two group subsets. The UE may perform rate matching around the DMRS REs within two group subsets.

[0230] When the new field indicates one group subset, the new field may include a group subset index. When the new field indicates one group subset and a group subset index, the one group subset may be the group subset corresponding to the group subset index.

[0231] When the new field indicates two group subsets (group subsets #1 and #2), the new field may include a group subset index.

[0232] When the second group subset is indicated by the group subset index, in the antenna port table, the indicated DMRS port index j may be regarded as DMRS port j + P. Here, P may be the maximum number of DMRS ports per group subset (the maximum number). The number of DMRS CDM groups {1, 2, 3} without data may refer to the CDM groups within the second group subset.

[0233] If the first group subset is indicated by the group subset index, in the antenna port table, the indicated DMRS port index j may be DMRS port j. The number of DMRS CDM groups without data {1, 2, 3} may refer to the CDM groups within the first group subset.

[0234] If the new field indicates two group subsets, the UE may not transmit / receive data on the REs indicated by the DMRS REs within the two group subsets. The UE may follow either of the following rate matchings 1 and 2. [[Rate matching 1]] The UE performs rate matching around the DMRS REs within all the DMRS ports within the two group subsets. [[Rate matching 2]] The UE performs rate matching around the DMRS REs within all the DMRS ports within the first group subset and a certain DMRS port within the second group subset. An additional field (CDM group number field) for indicating the number of CDM groups within the second group subset for rate matching may be added (to the DCI). The additional field may be applied only when the DMRS RE positions of the j-th port within the two group subsets are different. If the second group subset is indicated by the group subset index, the additional field is not required, and the UE may follow the antenna port field with respect to the number of CDM groups for rate matching. If the first group subset is indicated by the group subset index, the additional field is valid, and the UE may follow the indicated number of CDM groups for rate matching.

[0235] For example, the value of the new field may indicate the following. · The value 00 may indicate one group subset for rate matching and the antenna port indication (within the default group subset #1) for its DMRS. · The value 01 may indicate two group subsets for rate matching and the antenna port indication within group subset #1 for its DMRS. · The value 10 may indicate two group subsets for rate matching and the antenna port indication within group subset #2 for its DMRS. · The value 11 may be reserved.

[0236] As a variation, even when only one group subset is indicated, a group subset index may be required. For example, the value of the new field may indicate the following. · The value 00 may indicate one group subset for rate matching and the antenna port indication within group subset #1 for its DMRS. · The value 01 may indicate one group subset for rate matching and the antenna port indication within group subset #2 for its DMRS. · The value 10 may indicate two group subsets for rate matching and the antenna port indication within group subset #1 for its DMRS. · The value 11 may indicate two group subsets for rate matching and the antenna port indication within group subset #2 for its DMRS.

[0237] [Example 5-6] For example, in the example of the existing antenna port table (Figure 1) for DMRS configuration type 1 and DMRS maximum length = 1, the interpretation of the existing antenna port table may follow the following. · The DMRS CDM group numbers 1, 2 without data may respectively refer to the CDM groups {0}, {0, 1}. · In group subset #1, CDM group 0 may correspond to DMRS port indices {0, 1}, and CDM group 1 may correspond to DMRS port indices {2, 3}. · In group subset #2, CDM group 0 may correspond to DMRS port indices {4, 5}, and CDM group 1 may correspond to DMRS port indices {6, 7}. · If two group subsets are indicated and group subset #2 is indicated, port index j may mean the j-th port within group subset #2. Port index j may be index j + P = j + 4 within group subset #2. For group subset #2, DMRS ports 0, 1, 2, 3 may be interpreted as DMRS ports 4, 5, 6, 7 respectively.

[0238] According to this example, the DMRS ports can be increased without changing the antenna port table.

[0239] According to the fifth embodiment, by using lists or subsets, the DMRS ports can be increased without changing the antenna port table.

[0240] <UE capability> The UE may send (report) UE capability information indicating whether it supports at least one of the examples in the present disclosure to the network (base station). Also, the UE may receive an indication / configuration (e.g., indication / configuration regarding enabled / disabled) regarding at least one of the examples in the present disclosure by upper layer signaling / physical layer signaling. The indication / configuration may correspond to the UE capability information sent by the UE. At least one of the examples in the present disclosure may be applied only to the UE that has received the indication / configuration, the UE that has sent the corresponding UE capability information, or the UE that supports the corresponding UE capability.

[0241] (Wireless communication system) Hereinafter, the configuration 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 embodiments of the present disclosure.

[0242] FIG. 10 is a diagram showing an example of the schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., which are specified by the Third Generation Partnership Project (3GPP).

[0243] Also, the wireless communication system 1 may support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0244] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the 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.

[0245] The wireless communication system 1 may support dual connectivity between a plurality of base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both the MN and the SN are base stations (gNBs) of NR).

[0246] The wireless communication system 1 may 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 disposed within the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and the user terminal 20 are not limited to the modes shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0247] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) and dual connectivity (DC) using a plurality of component carriers (CCs).

[0248] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, or the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). Note that the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0249] Also, the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

[0250] The plurality of base stations 10 may be connected by wire (e.g., an optical fiber compliant with Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the upper-level station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0251] The base station 10 may be connected to the core network 30 via another base station 10 or directly. The core network 30 may include at least one of, for example, Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0252] The user terminal 20 may be a terminal corresponding to at least one of communication systems such as LTE, LTE-A, 5G, etc.

[0253] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access method 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.

[0254] The wireless access method may be referred to as a waveform. Note that in the wireless communication system 1, other wireless access methods (for example, other single carrier transmission methods, other multi-carrier transmission methods) may be used for the wireless access methods of the UL and the DL.

[0255] In the wireless communication system 1, as the downlink channel, a physical downlink shared channel (PDSCH) shared by each user terminal 20, a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH), etc. may be used.

[0256] Also, in the wireless communication system 1, as the uplink channel, a physical uplink shared channel (PUSCH) shared by each user terminal 20, a physical uplink control channel (PUCCH), a physical random access channel (PRACH), etc. may be used.

[0257] The PDSCH is used to transmit user data, upper layer control information, System Information Block (SIB), etc. The PUSCH may be used to transmit user data, upper layer control information, etc. Also, the PBCH may be used to transmit the Master Information Block (MIB).

[0258] The PDCCH may be used to transmit lower layer control information. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.

[0259] Note that the DCI for scheduling the PDSCH may be called DL assignment, DL DCI, etc., and the DCI for scheduling the PUSCH may be called UL grant, UL DCI, etc. Note that the PDSCH may be read as DL data, and the PUSCH may be read as UL data.

[0260] For the detection of the PDCCH, a control resource set (COntrol REsource SET (CORESET)) and a search space may be used. The CORESET corresponds to the resource for searching for the DCI. The search space corresponds to the search area and search method for PDCCH candidates (PDCCH candidates). One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0261] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. in the present disclosure may be read interchangeably with each other.

[0262] Uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be referred to as, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) may be transmitted by PUCCH. A random access preamble for connection establishment with a cell may be transmitted by PRACH.

[0263] Note that in the present disclosure, downlink, uplink, etc. may be expressed without "link". Also, "physical" may be omitted from the beginning of various channels.

[0264] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, 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 be transmitted.

[0265] The synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, an SS Block (SSB), etc. Note that SS, SSB, etc. may also be called reference signals.

[0266] Also, in the wireless communication system 1, as the uplink reference signal (Uplink Reference Signal (UL-RS)), a sounding reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may be transmitted. Note that DMRS may also be called a UE-specific reference signal.

[0267] (Base station) FIG. 11 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may be provided.

[0268] Note that in this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each part described below may be omitted.

[0269] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0270] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission / reception, measurement, etc., using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may generate data, control information, a sequence, etc., to be transmitted as a signal, and transfer it to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, releasing, etc.) of a communication channel, state management of the base station 10, management of radio resources, etc.

[0271] The transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmission / reception unit 120 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0272] The transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122. The reception unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0273] The transmission / reception antenna 130 can be composed of an antenna described based on the common understanding in the technical field related to the present disclosure, such as an array antenna.

[0274] The transmission / reception unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0275] The transmission / reception unit 120 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0276] The transmission / reception unit 120 (transmission processing unit 1211) may perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 110, and generate a bit sequence to be transmitted.

[0277] The transceiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel encoding (which may include error correction encoding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0278] The transceiver unit 120 (RF unit 122) may perform modulation to the radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the signal in the radio frequency band via the transceiver antenna 130.

[0279] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to the baseband signal, etc. on the signal in the radio frequency band received by the transceiver antenna 130.

[0280] The transceiver unit 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing on the acquired baseband signal, and acquire user data, etc.

[0281] The transmitting and receiving unit 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0282] The transmission path interface 140 may transmit and receive signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0283] Note that the transmitting and receiving parts of the base station 10 in the present disclosure may be constituted by at least one of the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140.

[0284] Note that the transmitting and receiving unit 120 may transmit an antenna port indication when at least one of the set Demodulation Reference Signal (DMRS) type and the maximum length of the DMRS is not 1.

[0285] The control unit 110 may control the reception of uplink (UL) transmission corresponding to two codewords and using a layer number greater than 4, which is transmitted based on the antenna port indication.

[0286] The transmission / reception unit 120 may transmit an instruction regarding uplink (UL) transmission. The control unit 110 may control the reception of the UL transmission using a layer number greater than 4, which is transmitted based on a specific condition.

[0287] (User terminal) FIG. 12 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. Note that one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided.

[0288] Note that in this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

[0289] The control unit 210 controls the entire user terminal 20. The control unit 210 may be composed of a controller, a control circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0290] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission, reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals and transfer them to the transmission / reception unit 220.

[0291] The transmission / reception unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmission / reception unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0292] The transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222. The reception unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0293] The transmission / reception antenna 230 can be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna.

[0294] The transmission / reception unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 220 may transmit the above-described uplink channel, uplink reference signal, etc.

[0295] The transmission / reception unit 220 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0296] The transmission / reception unit 220 (transmission processing unit 2211) may perform processing of the PDCP layer, processing of the RLC layer (e.g., RLC retransmission control), processing of the MAC layer (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, for example, and generate a bit string to be transmitted.

[0297] The transmission / reception unit 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, digital-to-analog conversion, etc. on the bit string to be transmitted, and output a baseband signal.

[0298] Whether to apply the DFT process may be based on the settings of the transform precoding. The transceiver unit 220 (transmission processing unit 2211) may perform the DFT process as the above-mentioned transmission processing to transmit a certain channel (for example, PUSCH) using the DFT-s-OFDM waveform when the transform precoding is enabled for that channel, or may not perform the DFT process as the above-mentioned transmission processing if not.

[0299] The transceiver unit 220 (RF unit 222) may perform modulation to the radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the signal in the radio frequency band via the transceiver antenna 230.

[0300] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to the baseband signal, etc. on the signal in the radio frequency band received by the transceiver antenna 230.

[0301] The transceiver unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0302] The transceiver unit 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (for example, RSRP), received quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), etc. The measurement results may be output to the control unit 210.

[0303] Note that the transmission unit and reception unit of the user terminal 20 in the present disclosure may be configured by at least one of a transmission / reception unit 220 and a transmission / reception antenna 230.

[0304] Note that the transmission / reception unit 220 may 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.

[0305] The control unit 210 may control the uplink (UL) transmission corresponding to two codewords and using a layer number greater than 4 based on the antenna port indication.

[0306] When the DMRS type is 1 and the maximum length of the DMRS is 2, the control unit 210 may control the UL transmission such 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.

[0307] When the DMRS type is 2 and the maximum length of the DMRS is 1, the control unit 210 may control the UL transmission such 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.

[0308] When the DMRS type is 2 and the maximum length of the DMRS is 2, the control unit 210 may control the UL transmission such 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.

[0309] The transceiver unit 220 may receive an instruction regarding uplink (UL) transmission. The control unit 210 may control the UL transmission using a layer number greater than 4 based on specific conditions.

[0310] The specific conditions may be a designation regarding at least one of the number of transmission antennas and the rank. The specific conditions may be that at least one of a specific DCI format, dynamic scheduling, configured grant, and a specific type of physical uplink shared channel regarding the UL transmission is applied.

[0311] The transceiver unit 220 may receive a setting regarding the number of demodulation reference signal (DMRS) ports that varies according to at least one of the layer number and the terminal capability. The control unit 210 may control the UL transmission based on the setting.

[0312] (Hardware Configuration) Note that the block diagrams used in the description of the above embodiments show functional unit blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (for example, using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0313] Here, functions include, but are not limited to, judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection determination, establishment, comparison, assumption, expectation, regarded as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), assigning, etc. For example, a functional block (component) that enables transmission may be referred to as a transmitting unit, a transmitter, etc. In any case, as described above, the implementation method is not particularly limited.

[0314] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 13 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may physically be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0315] Note that in the present disclosure, terms such as device, circuit, device, section, unit, etc. can be read interchangeably with each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0316] For example, although only one processor 1001 is shown in the figure, there may be a plurality of processors. Also, the processing may be executed by one processor, or the processing may be executed by two or more processors simultaneously, sequentially, or using other methods. Note that the processor 1001 may be implemented by one or more chips.

[0317] Each function in the base station 10 and the user terminal 20 is realized, for example, by causing a processor 1001 to load a predetermined software (program) onto hardware such as a memory 1002, so that the processor 1001 performs operations, controls communication via a communication device 1004, or controls at least one of reading and writing data in the memory 1002 and a storage 1003.

[0318] The processor 1001 controls the entire computer by operating, for example, an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the above-described control unit 110 (210), transmission / reception unit 120 (220), and the like may be realized by the processor 1001.

[0319] Further, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and the same applies to other functional blocks.

[0320] Memory 1002 is a computer-readable recording medium and may be constituted by, for example, at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other suitable storage media. Memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. Memory 1002 can store a program (program code), a software module, or the like executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0321] Storage 1003 is a computer-readable recording medium and may be constituted by, for example, at least one of a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (e.g., a compact disc (Compact Disc ROM (CD-ROM), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other suitable storage media. Storage 1003 may be referred to as an auxiliary storage device.

[0322] The communication device 1004 is hardware (a transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-described transceiver unit 120 (220), the transceiver antenna 130 (230), etc. may be implemented by the communication device 1004. The transceiver unit 120 (220) may be physically or logically separated and implemented by a transmitter unit 120a (220a) and a receiver unit 120b (220b).

[0323] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

[0324] Also, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for each device.

[0325] In addition, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA), and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0326] (Modification example) Regarding the terms described in the present disclosure and the terms necessary for understanding the present disclosure, they may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be read interchangeably with each other. Also, a signal may be a message. A reference signal may also be abbreviated as RS and may be called a Pilot, a pilot signal, etc. depending on the applicable standard. Further, a Component Carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, etc.

[0327] The radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may be called a subframe. Further, the subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) independent of numerology.

[0328] Here, the new numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The new numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering process performed by a transceiver in the frequency domain, specific windowing process performed by a transceiver in the time domain, etc.

[0329] A slot may be composed of one or more symbols (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. Also, a slot may be a time unit based on the new numerology.

[0330] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0331] A radio frame, sub-frame, slot, mini-slot, and symbol all represent time units for signal transmission. For a radio frame, sub-frame, slot, mini-slot, and symbol, other corresponding names may be used. Note that the time units such as frame, sub-frame, slot, mini-slot, and symbol in this disclosure may be read interchangeably with each other.

[0332] For example, one sub-frame may be called a TTI, or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be a sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc. instead of a sub-frame.

[0333] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. Note that the definition of the TTI is not limited to this.

[0334] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), code block, codeword, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when the TTI is given, the time interval (for example, the number of symbols) in which the transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0335] When one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0336] A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may 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-slot, a sub-slot, a slot, etc.

[0337] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and not less than 1 ms.

[0338] A resource block (Resource Block (RB)) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in the RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0339] Also, the RB may include one or a plurality of symbols in the time domain, and may be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may each be constituted by one or a plurality of resource blocks.

[0340] Note that one or more RBs may be referred to as a Physical Resource Block (PRB), a Sub-Carrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, etc.

[0341] Also, a resource block may be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 sub-carrier and 1 symbol.

[0342] A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0343] 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 set within one carrier.

[0344] At least one of the set BWPs may be active, and the UE may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that in the present disclosure, "cell", "carrier", etc. may be read as "BWP".

[0345] Note that the structures such as the above-described radio frames, sub-frames, slots, mini-slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be variously changed.

[0346] Also, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or using corresponding other information. For example, a radio resource may be indicated by a predetermined index.

[0347] The names used for parameters, etc. in the present disclosure are not limiting names in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (such as PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any way.

[0348] The information, signals, etc. described in the present disclosure may be represented using any of various different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0349] Also, information, signals, etc. may be output from at least one of the upper layer to the lower layer and from the lower layer to the upper layer. Information, signals, etc. may be input and output via a plurality of network nodes.

[0350] The input / output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. The information, signals, etc. to be input / output may be overwritten, updated, or appended. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

[0351] The notification of information is not limited to the modes / embodiments described in this disclosure and may be performed using other methods. For example, the notification of information in this disclosure may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper 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 combinations thereof.

[0352] Note that physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Also, RRC signaling may be referred to as an RRC message and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. Further, MAC signaling may be notified, for example, using a MAC Control Element (CE).

[0353] Also, the notification of predetermined information (e.g., the notification of "being X") is not limited to explicit notification and may be performed implicitly (e.g., by not performing the notification of the predetermined information or by the notification of another piece of information).

[0354] The determination may be made based on a value represented by 1 bit (either 0 or 1), a boolean value represented by true or false, or a numerical comparison (e.g., comparison with a predetermined value).

[0355] Software should be interpreted broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, a hardware description language, or by some other name.

[0356] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0357] The terms "system" and "network" used in the present disclosure may be used interchangeably. "Network" may mean the devices (e.g., base stations) included in the network.

[0358] 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", "panel", etc. can be used interchangeably.

[0359] In the present disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. can be used interchangeably. The base station may also be referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0360] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each of these smaller areas can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base station and the base station subsystem that provides communication services in this coverage.

[0361] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0362] A mobile station may also be called a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate term.

[0363] At least one of the base station and the mobile station may also be called a transmitting device, receiving device, wireless communication device, etc. Note that at least one of the base station and the mobile station may also be a device mounted on a moving object, the moving object itself, etc.

[0364] The mobile object refers to an object that can move, and its moving speed is arbitrary, including the case where the mobile object is stationary. The mobile object includes, for example, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, shovel cars, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, rear cars, rickshaws, ships (ship and other watercraft), airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, balloons, and objects mounted thereon, and is not limited thereto. Further, the mobile object may be a mobile object that autonomously travels based on an operation command.

[0365] The mobile object may be a vehicle (e.g., a car, an airplane, etc.), a mobile object that moves without a driver (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (a manned or unmanned type). Note that at least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0366] FIG. 14 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.

[0367] The drive unit 41 is composed of, for example, at least one of an engine, a motor, and a hybrid of an engine and a motor. The steering unit 42 includes at least a steering wheel (also called a handle), and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on an operation of the steering wheel operated by a user.

[0368] 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 be called an Electronic Control Unit (ECU).

[0369] Examples of the signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the current of the motor, a rotational speed signal of the front wheels 46 / rear wheels 47 obtained by a rotational speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58.

[0370] The information service unit 59 is composed of various devices for providing (outputting) various information such as driving information, traffic information, and entertainment information, such as a car navigation system, an audio system, speakers, a display, a television, and a radio, and one or more ECUs for controlling these devices. The information service unit 59 uses the information obtained from an external device via a communication module 60 or the like to provide various information / services (for example, multimedia information / multimedia services) to the passengers of the vehicle 40.

[0371] The information service unit 59 may include an input device for receiving an external input (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.), or may include an output device for performing an external output (for example, a display, speakers, an LED lamp, a touch panel, etc.).

[0372] The driving assistance system unit 64 is composed of various devices for providing functions to prevent accidents and reduce the driver's driving load, such as a millimeter-wave radar, Light Detection and Ranging (LiDAR), a camera, a positioning locator (e.g., Global Navigation Satellite System (GNSS), etc.), map information (e.g., High Definition (HD) map, Autonomous Vehicle (AV) map, etc.), a gyro system (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS), etc.), an Artificial Intelligence (AI) chip, an AI processor, and one or more ECUs for controlling these devices. Further, the driving assistance system unit 64 transmits and receives various information via the communication module 60 to realize a driving assistance function or an autonomous driving function.

[0373] 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) via the communication port 63 to 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 various sensors 50 - 58 provided in the vehicle 40.

[0374] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information via wireless communication with the external device. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the above-mentioned base station 10, user terminal 20, etc. Further, the communication module 60 may be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it may also function as at least one of the base station 10 and user terminal 20).

[0375] The communication module 60 may transmit at least one of the signals from the various sensors 50 - 58 described above input to the electronic control unit 49, the information obtained based on the signals, and the information based on the input from the external (user) obtained via the information service unit 59 to the external device via wireless communication. The electronic control unit 49, various sensors 50 - 58, information service unit 59, etc. may be referred to as an input unit that receives the input. For example, the PUSCH transmitted by the communication module 60 may include the information based on the above input.

[0376] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from the external device and displays it on the information service unit 59 provided in the vehicle. The information service unit 59 may be referred to as an output unit that outputs the information (for example, outputs the information to devices such as a display and a speaker based on the PDSCH received by the communication module 60 (or the data / information decoded from the PDSCH)).

[0377] Also, the communication module 60 stores the various information received from the external device in the memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, various sensors 50 - 58, etc. provided in the vehicle 40.

[0378] Also, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between a base station and a user terminal is replaced by communication between a plurality of user terminals (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described base station 10 may be configured as functions of the user terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to communication between terminals (for example, "sidelink"). For example, an uplink channel, a downlink channel, etc. may be replaced with a sidelink channel.

[0379] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described user terminal 20 may be configured as functions of the base station 10.

[0380] In the present disclosure, operations assumed to be performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes having a base station, it is obvious that various operations performed for communication with a terminal can be performed by a base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited thereto), or a combination thereof.

[0381] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, regarding the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0382] Each aspect / embodiment described in the present disclosure may be applied to systems that utilize 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, a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable wireless communication methods, and next-generation systems extended, modified, created, or defined based on these. Also, multiple systems may be combined (for example, a combination of LTE or LTE-A and 5G, etc.) and applied.

[0383] As used in this disclosure, the recitation "based on" does not mean "based solely on" unless otherwise specified. In other words, the recitation "based on" means both "based solely on" and "based at least in part on".

[0384] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not generally limit the amount or order of those elements. These terms may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements may be employed or that the first element must precede the second element in any way.

[0385] The term "determining" as used in this disclosure may encompass a variety of operations. For example, "determining" may be considered to be "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up, search, inquiry" (e.g., searching in a table, database or another data structure), "ascertaining", etc.

[0386] Also, "determining" may be considered to be "receiving" (e.g., receiving information), "transmitting" (e.g., transmitting information), "input", "output", "accessing" (e.g., accessing data in a memory), etc.

[0387] Also, "judgment (decision)" may be regarded as "resolving", "selecting", "choosing", "establishing", "comparing", etc. by "judgment (decision)". That is, "judgment (decision)" may be regarded as "judgment (decision)" of some action.

[0388] Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

[0389] As used in this disclosure, the terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed".

[0390] In this disclosure, when two elements are connected, it can be considered that they are "connected" or "coupled" to each other using one or more electric wires, cables, printed electrical connections, etc., and also using, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, light (both visible and invisible) region.

[0391] In this disclosure, the term "A and B are different" may mean "A and B are different from each other". Note that the term may also mean "A and B are different from C respectively". Terms such as "separate" and "coupled" may also be interpreted in the same way as "different".

[0392] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0393] In the present disclosure, for example, when articles are added by translation, such as a, an and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0394] As described above in detail with respect to the invention according to the present disclosure, it is obvious to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and changed forms without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not impose any limiting meaning on the invention according to the present disclosure.

Claims

1. a receiving unit that receives an antenna port indication when the type of the configured demodulation reference signal (DeModulation Reference Signal (DMRS)) is not the first type or when the maximum length of the DMRS is not 1; a control unit that controls uplink (UL) transmission corresponding to two codewords and using a layer number greater than 4 based on the antenna port indication; and has, The control unit is a terminal that controls the UL transmission such 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 when the type of the DMRS is the first type and the maximum length of the DMRS is 2.

2. The control unit controls the UL transmission such 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 when the type of the DMRS is the second type and the maximum length of the DMRS is 1. The terminal according to claim 1.

3. The control unit controls the UL transmission such 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 when the type of the DMRS is the second type and the maximum length of the DMRS is 2. The terminal according to claim 1.

4. a step of receiving an antenna port indication when the type of the configured demodulation reference signal (DeModulation Reference Signal (DMRS)) is not the first type or when the maximum length of the DMRS is not 1; a step of controlling UL transmission corresponding to two codewords and using a layer number greater than 4 based on the antenna port indication; When the type of the DMRS is the first type and the maximum length of the DMRS is 2, a step of controlling the UL transmission such 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; A wireless communication method for a terminal having the above.

5. A transmitting unit that transmits an antenna port instruction when the type of the set Demodulation Reference Signal (DMRS) is not the first type or the maximum length of the DMRS is not 1; A control unit that controls reception of the UL transmission using a layer number greater than 4, which is the UL transmission corresponding to two codewords, transmitted based on the antenna port instruction; The control unit is a base station that controls reception of the UL transmission in which transmission is controlled such 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 when the type of the DMRS is the first type and the maximum length of the DMRS is 2.

6. A system having a terminal and a base station, The terminal includes a receiving unit that receives an antenna port instruction when the type of the set Demodulation Reference Signal (DMRS) is not the first type or the maximum length of the DMRS is not 1; A control unit that controls the UL transmission using a layer number greater than 4, which is the UL transmission corresponding to two codewords, based on the antenna port instruction; The control unit controls the UL transmission such 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 when the type of the DMRS is the first type and the maximum length of the DMRS is 2, The base station includes a transmitting unit that transmits the antenna port instruction; A system having a control unit that controls reception of the UL transmission transmitted based on the antenna port instruction.

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