Terminal, wireless communication method, base station, and system

Abstract

A terminal according to an aspect of the present disclosure is characterized by comprising: a receiving unit that receives an instruction regarding uplink (UL) transmission; and a control unit that controls the UL transmission using the number of layers greater than four on the basis of a specific condition. According to one aspect of the present disclosure, it is 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, a wireless communication method in a next-generation mobile communication system 、 base station and system and 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 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, up to 4-layer uplink (UL) multi-input multi-output (MIMO) transmission 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 receiving unit that receives an instruction regarding uplink (UL) transmission, and a control unit that controls the UL transmission using a layer number greater than 4 based on a specific condition. and the specific condition is that at least one of a specific DCI format and dynamic scheduling is applied to the UL transmission having 、 this feature.

Effects of the Invention

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

Brief Description of the Drawings

[0010]

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Embodiments for Carrying Out 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 sounding 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 (the 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 the 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., the time and / or frequency resource position, the resource offset, the period of the resource, the number of repetitions, the number of SRS symbols, the SRS bandwidth, etc.), the 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., the "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 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 mutually interchangeable. Also, the CSI-RS index, the CSI-RS resource ID, and the CSI-RS Resource Indicator (CRI) may be mutually interchangeable. Also, the SRS index, the SRS resource ID, and the SRI may be mutually interchangeable.

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

[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., the 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 two SRS resources, which is set by the RRC, and one of the maximum two 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 layer number 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 four SRS resources, which is set by the RRC, and one or more of the maximum four 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 set in the upper layer, the transmission beam of the PUSCH may be calculated based on the set 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 1st symbol or a symbol near the 1st) 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 the 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 the 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 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 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 the orthogonality 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 larger than the number of layers used for data enables more accurate channel state measurement 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 only be applied to double-symbol DMRS.

[0054] The OCC of the present disclosure may be mutually read as an orthogonal code, orthogonalization, cyclic shift, etc.

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

[0056] Among DMRS, the DMRS resource-mapped in units of 2 consecutive (adjacent) symbols may be called double-symbol DMRS, and the DMRS resource-mapped in units of 1 symbol may 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 be called front-loaded DMRS, and the DMRS additionally mapped to other positions may 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 APs 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 APs 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 APs may be supported.

[0062] Also, in Rel-15 NR, multi-port CSI-RS supports up to 32 ports by using frequency division multiplexing (FDM), time division multiplexing (TDM), frequency domain OCC, time domain OCC, etc. For the orthogonalization of CSI-RS, the same method as 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'ed, they are orthogonal. On the other hand, within the same CDM group, the orthogonality of the applied OCC may be disrupted due to channel fluctuations or the like. In this case, if signals within the same CDM group are received with different received powers, a near-far problem may occur, and there is a risk that orthogonality cannot be guaranteed.

[0065] Here, the TD-OCC / FD-OCC of the DMRS in Rel.15 NR 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 DMRS in Rel.15 NR correspond to an OCC with a sequence length (which may also be called an OCC length) = 2. Therefore, the possible values of k’ and l’ 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 antenna ports 1000 - 1001 and antenna ports 1002 - 1003 (and also antenna ports 1004 - 1005 in the case of type 2), different values of Δ are applied, and thus FDM is applied. Therefore, the antenna ports 1000 - 1003 (or 1000 - 1005) corresponding to single-symbol DMRS are orthogonalized using FD-OCC and FDM.

[0070] For type 1 antenna ports 1000 - 1003 and antenna ports 1004 - 1007, {w t (0), w t (1)} = {+1, +1} and {w t (0), w t (1)} = {+1, -1} is applied, and it is orthogonalized using TD-OCC. Therefore, the antenna ports 1000 - 1007 (or 1000 - 1011) corresponding to 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 × 2 = 4 ports (by comb / FDM) × (by FD OCC). [Case 2] Double-symbol DMRS of DMRS configuration type 1 The total number of DMRS ports is 2 × 2 × 2 = 8 ports (by comb / FDM) × (by FD OCC) × (by TD OCC). [Case 3] Single-symbol DMRS of DMRS configuration type 2 The total number of DMRS ports is 3 × 2 = 6 ports (by FDM) × (by FD OCC). [Case 4] Double-symbol DMRS of DMRS configuration type 2 The total number of DMRS ports is 3 × 2 × 2 = 12 ports (by comb) × (by FD OCC) × (by TD OCC).

[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 content 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 of 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 of 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 of the antenna port field, respectively.

[0088] Figures 3A - 3D are diagrams showing examples of tables of antenna ports to be referred to 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 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.

[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 of 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 of the antenna port field, respectively.

[0092] FIG. 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 with the values of the antenna port field = 0 to 1, respectively.

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

[0094] FIG. 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 with the values of the antenna port field = 0 to 27, respectively.

[0095] FIG. 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 with the values of the antenna port field = 0 to 18, respectively.

[0096] FIG. 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 with the values of the antenna port field = 0 to 5, respectively.

[0097] FIG. 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 with the values of the antenna port field = 0 to 4, respectively.

[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 preceding 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 with a rank greater than 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 examples 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] Figure 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. 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 Figure 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 for DMRS ports 0-4 may be supported for 2+3 layers, and only the entries for DMRS ports 0, 1, 2, 3, 6 may be supported for 3+2 layers.

[0107] Figure 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.

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

[0109] Figure 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.

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

[0111] Figure 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 maximum length of DMRS = 1] When DMRS type = 2 and 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 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 maximum length of DMRS = 2] When DMRS type = 2 and 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 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 of the antenna port field = 0 to 2.

[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 of the antenna port field = 0 to 3.

[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 of the antenna port field = 0 to 2.

[0123] FIG. 8D 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 corresponding to values of the antenna port field = 0 to 2.

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

[0125] According to the DMRS port indication of the layer number greater than 4 described above, for PUSCH using a layer number greater than 4 when the transform precoder is invalid, the antenna port 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 for 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 for a layer number greater than 4 layers. Also, the limitations (conditions) of 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 independently 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 or less may be read interchangeably with each other. The application of two codewords and the number of layers being greater than 4 may be read interchangeably with each other.

[0144] (Wireless communication method) <First Embodiment> [Case where the number of layers is 4 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 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 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 allocations between two codewords. The number of bits in the antenna port field of the 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 read 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 is equal to 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, entries 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, entries 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 entries based on at least one of the following principles may be further added to FIG. 6D corresponding to rank 8. 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 entries 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 entries based on the following principles may be further added to FIG. 7A corresponding to rank 5. 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]] For the DMRS configuration, when Case 3 is applied, an entry may be further added based on the principle that Figure 7B corresponding to Rank 6 includes six DMRS port indexes corresponding to three DMRS CDM groups. 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]] For the DMRS configuration, when Case 4 (DMRS type = 2, maximum length of DMRS = 2) is applied, an entry may be further added based on the following principle 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 (the first) DMRS CDM group, two DMRS port indexes corresponding to another (the second) DMRS CDM group, and one DMRS port index corresponding to another (the 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 Figure 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 indication (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 / indicated, 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 / indicated. 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] Figure 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 UL of 6TX or 8TX). 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 capability.

[0176] [Condition 2] The set maximum UL rank 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 regarding 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 from dynamic scheduling may be set for each PUSCH of configured grant.

[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 Message 3 / Message A PUSCH (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 PUSCH is set. For example, for a PUSCH with more than 4 layers, repeated transmission may not be set (or may be set).

[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 sent (or has not been sent). 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 port numbers 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 UE capabilities (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 DMRS port number setting in Rel.15 described above and the increased DMRS port number setting) cannot be set for 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 capabilities (reporting 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 DMRS port setting in Rel.15 described above and the increased DMRS port number setting) may be set for the UE simultaneously.

[0187] [Option 3] The setting regarding 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 regarding 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 support 6 or 8 layers, the setting regarding 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 capability report.

[0189] According to the fourth embodiment, the UE can appropriately restrict / set the setting regarding 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 the CDM group and the DMRS port.

[0196] A new concept of a CDM group list (list) may be introduced above the CDM group. The number of CDM groups and the order of the CDM groups for each CDM group list may follow the existing DMRS port table. The CDM group list may support at least one of the following Case 1-1 to Case 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 per CDM group list. There may be 4 DMRS ports per 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 per CDM group list. There may be 2 DMRS ports per 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 per CDM group list. There may be 4 DMRS ports per 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 per 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] If 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 within the first list.

[0212] If the new field indicates two lists, the UE may not need to transmit data on the REs indicated by the DMRS REs within the two lists. The UE may follow either of the following rate matching 1 and 2. [[Rate matching 1]] The UE performs rate matching around the DMRS REs within all DMRS ports in those two lists. [[Rate matching 2]] The UE performs rate matching around the DMRS REs within all DMRS ports in the first list and a certain DMRS port in the second list. An additional field (CDM group number field) for indicating the number of CDM groups in the second list for rate matching may be added (to the 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 in list #2. In case 1, the port index j may be index j + P = j + 4 in 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 CDM groups and 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 two group subsets per CDM group. Four DMRS ports may correspond to each 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 two group subsets per CDM group. Eight DMRS ports may correspond to each 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) for indicating 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) and the group subset index for the scheduled PUSCH / PDSCH may be added to DCI format 0_1 / 0_2 / 1_1 / 1_2 (that schedules the PUSCH / PDSCH). For antenna port indication, the existing antenna port table may be reused for each group subset.

[0226] When a 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, that one group subset may be the first group subset. When 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). When 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 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 the 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 users multiplexed with the UE for which the PUSCH / PDSCH is scheduled occupy 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 users multiplexed with the UE for which the PUSCH / PDSCH is scheduled occupy 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, within 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 DMRS CDM group numbers {1,2,3} without data may refer to the CDM groups within the second group subset.

[0233] When 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] When 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 those 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 within 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. When 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. When 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 each 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 number of DMRS ports can be increased without changing the antenna port table.

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

[0240] <UE capability> The UE may transmit (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 instruction / setting (e.g., an instruction / setting regarding enabled / disabled) regarding at least one of the examples in the present disclosure by upper layer signaling / physical layer signaling. The instruction / setting may correspond to the UE capability information transmitted by the UE. At least one of the examples in the present disclosure may be applied only to the UE that has received the instruction / setting, the UE that has transmitted 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) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0243] Further, 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)), and the like.

[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, NR-NR Dual Connectivity (NN-DC) where both the MN and SN are NR base stations (gNBs)).

[0246] The wireless communication system 1 may include a base station 11 that forms a relatively wide-coverage macro cell C1, 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] Further, 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, for example, at least one of 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 a 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 an 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 (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 referred to as DL assignment, DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as 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 setting.

[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 establishing a connection with a cell may be transmitted by PRACH.

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

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

[0273] The transceiver 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 transceiver unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver unit 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

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

[0276] The transceiver 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 (for example, RLC retransmission control), processing of the Medium Access Control (MAC) layer (for example, HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 110, and generate a bit string to be transmitted.

[0277] The transceiver unit 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit 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 radio frequency band signal 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 radio frequency band signal 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 transmission / reception 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) with 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 transmission unit and reception unit of the base station 10 in the present disclosure may be configured by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0284] Note that the transmission / reception 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] In this example, the functional blocks of the characteristic portions 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 understanding 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 also be based on the settings of the transform precoding. For a certain channel (e.g., PUSCH), when the transform precoding is enabled, the transmission unit 220 (transmission processing unit 2211) may perform the DFT process as the above transmission processing to transmit the channel using the DFT-s-OFDM waveform; otherwise, the DFT process may not be performed as the above transmission processing.

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

[0300] On the other hand, the transmission and reception unit 220 (RF unit 222) may perform amplification, filter processing, demodulation to the baseband signal, etc. on the radio frequency band signal received by the transmission and reception antenna 230.

[0301] The transmission and reception unit 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, 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 transmission and reception 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 (e.g., RSRP), reception quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[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 configured 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 transmission / reception 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 specification 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 transmission / reception 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's capabilities. 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 blocks of functional units. 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 may be realized using two or more physically or logically separated devices directly or indirectly (e.g., using wired, wireless, etc.) connected, and 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 calculations, 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, registers, 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] Also, 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 for causing 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 may be true for other functional blocks.

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

[0321] The storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, 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. The 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), 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. Also, a Component Carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, etc.

[0327] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may be called a subframe. Further, a 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 processing performed by the transceiver in the frequency domain, specific windowing processing performed by the 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. The PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot may be called PDSCH (PUSCH) mapping type B.

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

[0332] For example, one subframe may be called a TTI, or a plurality of consecutive subframes may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (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 subframe.

[0333] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a 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 a transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0335] In addition, 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 (number of 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 equal to or more 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] One or more RBs may also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, 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 RBs may be specified by the indexes of the RBs based on the common reference point of the carrier. A PRB may be defined in a certain BWP and numbered within that BWP.

[0343] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be configured within one carrier for a UE.

[0344] At least one of the configured BWPs may be active, and it may not be assumed that the UE transmits and receives 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 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 aspects / embodiments described in the present disclosure and may be performed using other methods. For example, the notification of information in the present disclosure may be 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 a combination thereof.

[0352] Note that the 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, the 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. Also, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0353] Also, the notification of predetermined information (e.g., the notification of "being X") is not limited to an 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 broadly interpreted 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 called 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 macrocell, small cell, femtocell, picocell, 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 a part or the whole 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 this 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 referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0363] At least one of the base station and the mobile station may also be referred to as 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, excavator trucks, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, rear cars, rickshaws, ships (ships 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 person (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 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, a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58, and so on.

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

[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 / from 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 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, the various sensors 50 - 58, the 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] Further, 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] In addition, 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 with 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 to be 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 to be 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, Mobility Management Entity (MME), 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 using 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, next-generation systems extended, modified, created, or defined based on these, etc. 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 "judging (deciding)". That is, "judgment (decision)" may be regarded as "judging (deciding)" 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 can 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, as some non-limiting and non-exhaustive examples, using electromagnetic energy having wavelengths in the radio frequency region, microwave region, light (both visible and invisible) region, etc.

[0391] In this disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separate", "coupled", etc. 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, the invention according to the present disclosure has been described in detail. However, 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 as modified and changed aspects 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 bring any limiting meaning to the invention according to the present disclosure.

Claims

1. a receiving unit that receives an instruction regarding uplink (UL) transmission; a control unit that controls the UL transmission using a layer number greater than 4 based on a specific condition, and having, wherein the specific condition is that at least one of a specific DCI format and dynamic scheduling is applied to the UL transmission, a terminal.

2. The terminal according to claim 1, wherein the UL transmission using a layer number greater than 4 is not supported when a DCI format different from the specific DCI format is applied.

3. The terminal according to claim 1, wherein the UL transmission using a layer number greater than 4 is not supported when a configured grant is applied.

4. The terminal according to claim 1, wherein the UL transmission using a layer number greater than 4 is not supported when multi-panel UL simultaneous transmission is configured.

5. a step of receiving an instruction regarding uplink (UL) transmission; a step of controlling the UL transmission using a layer number greater than 4 based on a specific condition, and having, wherein the specific condition is that at least one of a specific DCI format and dynamic scheduling is applied to the UL transmission, a wireless communication method for a terminal.

6. a transmitting unit that transmits an instruction regarding uplink (UL) transmission; a control unit that controls reception of the UL transmission using a layer number greater than 4 transmitted based on a specific condition, and having, wherein the specific condition is that at least one of a specific DCI format and dynamic scheduling is applied to the UL transmission, a base station.

7. A system having a terminal and a base station, wherein the terminal has a receiving unit that receives an instruction regarding uplink (UL) transmission; a control unit that controls the UL transmission using a layer number greater than 4 based on a specific condition, and having, wherein the base station has a transmitting unit that transmits the instruction; a control unit that controls reception of the UL transmission using a layer number greater than 4 transmitted based on the specific condition, and having, wherein the specific condition is that at least one of a specific DCI format and dynamic scheduling is applied to the UL transmission, a system.

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