Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure has: a control unit that determines the number M of antenna ports and the number N of layers, N being less than M; and a transmission unit for transmitting a physical uplink shared channel by using N layers. According to said one embodiment of the present disclosure, it is possible to suitably control UL transmission of a greater number of layers.

Description

Technical Field

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

Background Art

[0002] In 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

[0005] Existing wireless communication systems (e.g., Rel.15 NR) support uplink (UL) Multi-Input Multi-Output (MIMO) transmission up to four layers. For future wireless communication systems, support for UL transmission with a larger number of layers is being considered to achieve higher spectral efficiency.

[0006] However, for UL transmissions with a larger number of layers, how the network understands the antenna configuration of the UE and how it instructs the UE to perform such UL transmissions has not yet been thoroughly investigated. Failure to clarify this control could limit the increase in communication throughput.

[0007] Therefore, one of the objectives of this disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately control UL transmission with a larger number of layers. [Means for solving the problem]

[0008] A terminal according to one aspect of this disclosure includes a transmitting unit that reports capability information indicating that it supports the transmission of a number of antenna ports greater than 4, a receiving unit that receives upper layer signaling indicating the maximum number of ranks for transmitting a physical uplink sharing channel (PUSCH), a control unit that controls the transmission of the PUSCH based on the number of antenna ports M and the number of layers N, wherein the number of layers N is greater than 4, the number of antenna ports M is greater than the number of layers N, and the number of layers N is based on the capability information and the upper layer signaling. If the transform precoder is disabled, the demodulation reference signal (DMRS) port is determined based on the DMRS type, the maximum length of the DMRS, and the rank for transmitting the PUSCH, where the rank is greater than 4. . [Effects of the Invention]

[0009] According to one aspect of this disclosure, UL transmissions with a larger number of layers can be appropriately controlled. [Brief explanation of the drawing]

[0010] [Figure 1] Figures 1A and 1B show examples of limitations on the number of layers / ranks. [Figure 2] Figures 2A and 2B show an example of how to use a transmitting antenna. [Figure 3] Figures 3A and 3B show an example of a method for indicating the transmitting antenna. [Figure 4] Figures 4A and 4B show an example of UE capability information related to antenna coherency according to the first embodiment. [Figure 5] Figures 5A-5D show an example of a table of reference antenna ports in the fourth embodiment, where the transform precoder is disabled, DMRS type = 1, and DMRS maximum length = 2. [Figure 6] Figures 6A and 6B show an example of a table of reference antenna ports in the fourth embodiment, where the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 1. [Figure 7] Figures 7A-7D show an example of a table of reference antenna ports in the fourth embodiment, where the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 2. [Figure 8] Figure 8 shows an example of a schematic configuration of a wireless communication system according to one embodiment. [Figure 9] Figure 9 shows an example of the configuration of a base station according to one embodiment. [Figure 10] Figure 10 shows an example of the configuration of a user terminal according to one embodiment. [Figure 11] Figure 11 shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. [Modes for carrying out the invention]

[0011] (SRS, PUSCH transmission control) In Rel.15 NR, the UE may receive information used for transmitting a measurement reference signal (e.g., a sounding reference signal (SRS)), such as SRS configuration information, for example, parameters within the "SRS-Config" of the RRC control element.

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

[0013] One SRS resource set may be related to one or more SRS resources (one or more SRS resources may be grouped). Each SRS resource may be identified by an SRS resource indicator (SRI) or an SRS resource ID (Identifier).

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

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

[0016] Furthermore, the application (RRC parameter "usage", L1 (Layer-1) parameter "SRS-SetUse") may be, for example, beam management, codebook (CB), noncodebook (NCB), antenna switching, etc. SRS for codebook or noncodebook applications may be used to determine the precoder for SRI-based codebook-based or noncodebook-based uplink shared channel (PUSCH) transmission.

[0017] For example, in the case of codebook-based transmission, the UE may determine the 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 the precoder for PUSCH transmission based on the SRI.

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

[0019] The spatial relation information of the SRS (e.g., the "spatialRelationInfo" element of the RRC information element) may indicate spatial relation information between the reference signal and the SRS. The 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 called a Synchronization Signal Block (SSB).

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

[0021] In this disclosure, the terms SSB index, SSB resource ID, and SSB Resource Indicator (SSBRI) may be interpreted interchangeably. Similarly, the terms CSI-RS index, CSI-RS resource ID, and CSI-RS Resource Indicator (CRI) may be interpreted interchangeably. Furthermore, the terms SRS index, SRS resource ID, and SRI may be interpreted interchangeably.

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

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

[0024] If a UE sets spatial relationship information regarding a target SRS resource and another SRS (reference SRS), it may transmit the target SRS resource using the same spatial domain filter (spatial domain transmit filter) as the one used for transmitting the reference SRS. In other words, in this case, the UE may assume that the UE transmit beam for the reference SRS and the UE transmit beam for the target SRS are the same.

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

[0026] In Rel.15 / 16 NR, when using codebook-based transmission for PUSCH, the UE may have up to two SRS resources, with the codebook's SRS resource set configured by the RRC, and one of those up to two SRS resources indicated by the DCI (1-bit SRI field). The PUSCH transmit beam will be specified by the SRI field.

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

[0028] In Rel.15 / 16 NR, when using non-codebook-based transmission for PUSCH, the UE may have a set of SRS resources configured by the RRC, which has up to four SRS resources and is intended for non-codebook use, and one or more of these up to 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 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 PUSCH. The UE may also calculate the precoder for the above SRS resources.

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

[0031] Furthermore, the UE may be configured to use either codebook-based or non-codebook-based push transmission via a higher-layer parameter "txConfig" that indicates the transmission scheme. This parameter may represent the values ​​"codebook" or "noncodebook".

[0032] In this disclosure, Codebook-based PUSCH (Codebook-based PUSCH transmission, Codebook-based transmission, Codebook-based UL transmission) may mean PUSCH when “Codebook” is set as the transmission scheme for the UE. In this disclosure, Non-Codebook-based PUSCH (Non-Codebook-based PUSCH transmission, Non-Codebook-based transmission, Non-Codebook-based UL transmission) may mean PUSCH when “Non-Codebook” is set as the transmission scheme for the UE.

[0033] (High-ranking submission) Rel.15 NR supports uplink (UL) Multi-Input Multi-Output (MIMO) transmission up to 4 layers / rank. For future NRs, support for UL transmission with more than 4 layers is being considered to achieve higher spectral efficiency.

[0034] In certain scenarios (e.g., indoor, dense urban), high-rank transmission can achieve gains. Below, rank n-mTx represents the case where m transmitting antennas are used and the maximum rank is limited to n. Evaluations in the above scenario show that comparing rank 4-4Tx, rank 4-8Tx, rank 6-8Tx, and rank 8-8Tx, the highest performance is obtained in the rank 6-8Tx case. In the rank 6-8Tx and rank 8-8Tx cases, the scheduling probability per layer (rank distribution, number of layers scheduled, number of layers adaptively controlled) is highest for 5 and 6 layers, respectively. Even when the UE has 8 transmitting antennas, higher performance is observed when the maximum rank is limited (e.g., to rank 4 or 6).

[0035] However, for UL transmissions with a larger number of layers, how the network understands the antenna configuration of the UE and how it instructs the UE to perform such UL transmissions has not yet been thoroughly investigated. Failure to clarify this control could limit the increase in communication throughput.

[0036] Therefore, the inventors conceived a method for properly performing UL transmission with a larger number of layers.

[0037] The embodiments of this disclosure will be described in detail below with reference to the drawings. Each wireless communication method according to the embodiments may be applied individually or in combination. The embodiments of this disclosure may be used when UL TCI status is not introduced.

[0038] In this disclosure, “A / B / ... / X” may mean “at least one of A, B, ..., and X.”

[0039] In this disclosure, higher-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof. In this disclosure, RRC, RRC signaling, RRC parameter, higher-layer parameter, RRC information element (IE), RRC message, and setting may be interpreted as mutually exclusive.

[0040] MAC signaling may use, for example, MAC Control Elements (MAC CEs) or MAC Protocol Data Units (PDUs). Broadcast information may also include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), or Other System Information (OSIs).

[0041] Physical layer signaling may include, for example, Downlink Control Information (DCI).

[0042] In this disclosure, the terms activate, deactivate, indicate, select, configure, update, determine, etc., may be interpreted interchangeably.

[0043] In this disclosure, panels, beams, panel groups, beam groups, Uplink (UL) transmit entities, TRPs, spatial relation information (SRI), spatial relations, control resource sets (CORESETs), physical downlink shared channels (PDSCHs), codewords, base stations, antenna ports (e.g., demodulation reference signal (DMRS) ports), antenna port groups (e.g., DMRS port groups), groups (e.g., code division multiplexing (CDM) groups, reference signal groups, CORESET groups), resources (e.g., reference signal resources), resource sets (e.g., reference signal resource sets), CORESET pools, PUCCH groups (PUCCH resource groups), spatial relation groups, downlink TCI states (DL TCI states), uplink TCI states (UL TCI states), unified TCI states, QCLs, etc., may be interpreted interchangeably.

[0044] Furthermore, the spatial relationship information Identifier (ID) (TCI state ID) and spatial relationship information (TCI state) may be interpreted as mutually exclusive. "Spatial relationship information" may be interpreted as mutually exclusive as "a set of spatial relationship information," "one or more spatial relationship information," etc. TCI state and TCI may be interpreted as mutually exclusive.

[0045] In this disclosure, the terms index, ID, indicator, and resource ID may be interpreted interchangeably. Similarly, in this disclosure, the terms sequence, list, set, group, cluster, subset, etc., may be interpreted interchangeably.

[0046] In this disclosure, the terms "limit," "upper limit," "restriction," and "maximum number" may be interpreted interchangeably.

[0047] In this disclosure, rank, number of layers, number of MIMO layers, number of transmit layers, number of spatial multiplexings, and number of streams may be interpreted as mutually interchangeable.

[0048] In the following description of embodiments, "Spatial Relation Information (SRI)", "Spatial Relation Information for PUSCH", "Spatial Relationship", "UL Beam", "UE Transmit Beam", "UL TCI", "UL TCI State", "Spatial Relationship of UL TCI State", SRS Resource Indicator (SRI)", SRS Resource, Precoder, etc. may be interpreted as one another.

[0049] (Wireless communication method) For a UE having M antenna ports (transmitting antennas), the maximum number of rank / MIMO layers may be limited to N.

[0050] The (M,N) combinations supported by the UE may be reported as UE capabilities. The (M,N) combination, or the value of N, may be set by upper-layer signaling.

[0051] It is preferable that N is less than or equal to M in MIMO. However, the restriction by N being smaller than M (e.g., N=4 or 6 for M=8) has at least one of the following benefits. • Higher performance gain. • Simpler specifications. For example, in the case of M=8, there is no need to specify how to instruct / set the 5 / 6 / 7 / 8 layers for N=4, or the / 7 / 8 layers for N=6. • Lower DCI overhead. The number of DCI fields required for TPMI in codebook-based UL MIMO (maximum number, number of bits, size) and the number of SRI fields required for non-codebook-based UL MIMO (maximum number, number of bits, size) can be reduced.

[0052] The layer / rank limit may follow either of the following two options 1 and 2.

[0053] [Option 1] For a given M, the value of N, or the number of supported layers / ranks, is defined by the specification. In the example of Figure 1A, for the number of transmit antennas M = 1, the number of layers / ranks 1 is supported. For the number of transmit antennas M = 2, the numbers of layers / ranks 1 and 2 are supported. For the number of transmit antennas M = 4, the numbers of layers / ranks 1, 2, 3, and 4 are supported. For the number of transmit antennas M = 8, the numbers of layers / ranks 1, 2, 3, 4, 5, and 6 are supported.

[0054] [Option 2] In the specification, it may be supported that there is no limit on N (N is equal to M). The upper layer signaling may limit the value of N. For each number of transmit antennas M, a (different) value of N may be set. In the example of Figure 1B, for the number of transmit antennas M = 1, the maximum number of layers / ranks N is not set, meaning N = M = 1. For the number of transmit antennas M = 2, the maximum number of layers / ranks N is not set, meaning N = M = 2. For the number of transmit antennas M = 4, the maximum number of layers / ranks N is not set, meaning N = M = 4. For the number of transmit antennas M = 8, the maximum number of layers / ranks N is set to 6.

[0055] The UE may determine the number of antenna ports M and the number of layers / ranks N less than M, and transmit the PUSCH using N layers / ranks. If M is greater than a specific number, the number of layers / ranks may be limited to N. The specific number may be N, or a number greater than 4. N may be 6, or a number less than 8.

[0056] 《Method of Using Transmit Antennas》 If N < M, the UE may use the transmit antennas according to either of the following transmit antenna usage methods 1 and 2.

[0057] [Transmitting Antenna Usage Instructions 1] The UE uses all M transmitting antennas, but the maximum rank is limited to N. In the example in Figure 2A, the number of transmitting antennas M=8, so all 8 transmitting antennas are used, and up to N=6 layers / ranks are used.

[0058] [Transmitting Antenna Usage Instructions 2] The UE selects N transmitting antennas out of M transmitting antennas, uses all N transmitting antennas, and the maximum rank is N. In the example in Figure 2B, the number of transmitting antennas M=8 and the maximum rank N=6. All N=6 transmitting antennas are used, and up to 6 layers / ranks are used.

[0059] Antenna selection may be performed by the network (e.g., a base station) based on the reception results of SRS / PUCCH / PUSCH, and instructed to the UE by DCI / MAC CE / RRC IE. For example, the instruction may be a new DCI field for scheduling TPMI, SRI, or PUSCH.

[0060] Antenna selection may be performed by the UE based on the RS / channel measurement of the DL on each antenna port. For example, in the example in Figure 2B, the UE may select the best (top) six transmitting antennas that have the highest (top six) RSRP measurements.

[0061] 《Transmitting Antenna Instructions》 If the selection of a transmitting antenna port to be used for PUSCH transmission is instructed based on Transmitting Antenna Usage Method 2, the UE may instruct the transmitting antenna to be used in accordance with any of the following Transmitting Antenna Instruction Methods 1 to 3.

[0062] [Transmitting Antenna Instruction Method 1] The indication may show whether or not each transmitting antenna port is used. For example, the indication may be a bitmap. The bitmap may have M bits. The M bits may correspond to M transmitting antenna ports. The value of each bit may be 1 if the corresponding antenna port is used. The signaling overhead increases with the number of transmitting antenna ports. The indication may also be DCI / MAC CE / RRC IE.

[0063] [Transmitting Antenna Instruction Method 2] The RRC IE / MAC CE may specify / configure multiple candidates for the transmit antenna port, and DCI may select one of these candidates. In the example in Figure 3A, an index is associated with combinations (sets, groups, lists) of multiple candidates for the transmit antenna port. The RRC IE / MAC CE may configure / specify multiple candidates. The relationship between multiple candidates and the index may be defined in the specification, and the RRC IE / MAC CE may configure / specify the index.

[0064] [Transmitting Antenna Instruction Method 3] The transmitting antenna ports of PUSCH are associated with the transmitting antenna ports of SRS. The UE transmits SRS resources across multiple time resources using different combinations of transmitting antenna ports. When the network schedules PUSCH, it instructs which SRS resource index's antenna ports will be used for PUSCH. A mechanism similar to that used for beam management for spatial relation indication of PUSCH may be used.

[0065] In the example shown in Figure 3B, SRS#1 to #4 are each associated with multiple transmitting antenna ports, and SRS#1 to #4 are transmitted on different time resources. When the network specifies the SRS resource index (SRS#2) in the PUSCH scheduling, the transmitting antenna ports of the specified SRS resource are associated with the SRS. The UE uses the corresponding transmitting antenna port for PUSCH transmission.

[0066] <First Embodiment> The first embodiment relates to a transmit antenna configuration for a UE to support a number of layers greater than four.

[0067] 《UE Type / UE Ability》 A UE may report UE capability information to the network indicating that it supports transmission with a number of antenna ports greater than 4. This UE capability information may be called transmit antenna configuration UE capability information. Transmit antenna configuration UE capability information may include information about the number of transmit antenna ports supported by the UE (e.g., 6, 8, etc.) and may include information about the maximum number of layers for codebook-based PUSCH / non-codebook-based PUSCH supported by the UE.

[0068] Information regarding the maximum number of layers for the codebook-based PUSCH and the maximum number of layers for the non-codebook-based PUSCH may be indicated, for example, by the RRC parameters "maxNumberMIMO-LayersCB-PUSCH" and "maxNumberMIMO-LayersNonCB-PUSCH," respectively. Any parameter names in this disclosure may be prefixed with a suffix indicating a specific release (e.g., "r_18").

[0069] The UE may report UE capability information regarding antenna coherence to the network. This UE capability information regarding antenna coherence may be included in the UE capability information regarding the transmitting antenna configuration described above, or it may be included in other UE capability information. This UE capability information regarding antenna coherence may be indicated, for example, by the RRC parameter "pusch-TransCoherence".

[0070] The UE capability information regarding the antenna coherency may include information regarding at least one of the antenna assumptions and the codebook subset.

[0071] For example, UE capability information regarding the antenna coherency may be specified by "fullyAndPartialAndNonCoherent", "partialAndNonCoherent", or "NonCoherent".

[0072] Furthermore, the UE capability information regarding the antenna coherence may indicate a set of coherent antennas, the number of ports included in the set, or the number of such sets. For example, a UE that supports transmission with 6 antenna ports may report "(X1, X2, X3)" as the UE capability information regarding the antenna coherence.

[0073] Here, Xi (where i is an integer) indicates the number of antenna ports included in a set of one or more coherent antenna ports. Xi can take values ​​greater than or equal to 0 and less than or equal to the maximum number of antenna ports. Σ i Xi may correspond to the maximum number of antenna ports supported by the UE.

[0074] Xi (where i is an integer) may indicate the number of ports included in a single frame, in which case the UE capability information regarding antenna coherence described above may indicate the number of ports included in each frame. Note that a frame is a unit of grouping / setting antenna ports, and may be interpreted as a panel, panel group, antenna group, antenna port group, antenna port set, beam group, etc.

[0075] Figures 4A and 4B show an example of UE capability information regarding antenna coherence according to the first embodiment. This example describes a case where the UE supports transmission with 6 antenna ports.

[0076] Figure 4A corresponds to a transmitting antenna configuration in which all antenna ports are coherent within the frame. In Figure 4A, since all six antenna ports (ports 1-6) are coherent, the UE may report (X1, X2, X3) = (6, 0, 0).

[0077] Figure 4B corresponds to a transmitting antenna configuration having three sets (frames) where the combination of two antenna ports within a frame is coherent. Antenna ports between different frames are noncoherent. In this case, the UE may report (X1, X2, X3) = (2, 2, 2).

[0078] A UE that supports transmission via 8 antenna ports may report "(X1, X2, X3, X4)" as UE capability information regarding antenna coherence. If all 8 antenna ports are coherent, the UE may report (X1, X2, X3, X4) = (8, 0, 0, 0).

[0079] (X1, X2, X3, X4) = (4, 4, 0, 0) may represent a transmitting antenna configuration having two frames where the set of four antenna ports within a frame is coherent, and the antenna ports between different frames are noncoherent.

[0080] (X1, X2, X3, X4) = (2, 2, 2, 2) may represent a transmitting antenna configuration having four frames in which pairs of antenna ports within a frame are coherent, and antenna ports between different frames are noncoherent.

[0081] Note that at least one of the Xi values ​​to be reported may be omitted. For example, a UE with an antenna configuration of (X1, X2, X3, X4) = (2, 2, 2, 2) may report (X1, X2, X3) = (2, 2, 2) as UE capability information regarding antenna coherence. A base station receiving this UE capability information may, for example, derive X4 = 8 - (X1 + X2 + X3) = 2 based on UE capability information regarding the transmitting antenna configuration, if it understands that the UE supports 8 antenna ports. In this way, omitting the reporting of at least one Xi value can suppress the increase in communication overhead of UE capability information.

[0082] The array consisting of Xi as described above may also be called antenna coherency information, antenna coherency type, or similar terms.

[0083] 《UE Operation》 A UE that supports transmission with more than 4 antenna ports may support more than 4 UL layers. For example, a UE that supports 6 transmit antenna ports (which may be called a 6TX UE) may support up to a certain number of UL layers (e.g., 4 / 5 / 6). For example, a UE that supports 8 transmit antenna ports (which may be called an 8TX UE) may support up to a certain number of UL layers (e.g., 4 / 5 / 6 / 7 / 8).

[0084] The 6TX UE may use a table of precoding matrices for a specific number of (e.g., 1 / 2 / 3 / 4 / 5 / 6) layer transmissions using the 6 antenna ports as the precoding matrix table when the transform precoder is disabled.

[0085] The 6TX UE may use a table of precoding matrices for at least one-layer transmission using six antenna ports as the precoding matrix table when the transform precoder is enabled. The 6TX UE may also use a table of precoding matrices for two-layer transmission using six antenna ports as the precoding matrix table when the transform precoder is enabled.

[0086] The 8TX UE may use a table of precoding matrices for a specific number of (e.g., 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8) layer transmissions using the 8 antenna ports as the precoding matrix table when the transform precoder is disabled.

[0087] The 8TX UE may use a table of precoding matrices for at least one-layer transmission using eight antenna ports as the precoding matrix table when the transform precoder is enabled. The 8TX UE may also use a table of precoding matrices for two-layer transmission using eight antenna ports as the precoding matrix table when the transform precoder is enabled.

[0088] Furthermore, the precoding matrix in this disclosure may correspond to the TPMI index. Also, the precoding matrix table (which may be called a codebook) may differ for each antenna coherency type.

[0089] UEs that support transmission with more than 4 antenna ports (e.g., 6TX UE, 8TX UE) may report UE capability information indicating the maximum number of layers supported for UL transmission.

[0090] The UE may report UE capability information indicating whether it supports 2-layer UL transmission when the transform precoder is enabled.

[0091] 《Number of ranks / layers for codebook MIMO》 For a UE that supports transmission using M transmitting antenna ports, the maximum number of ranks / layers N in codebook MIMO (codebook-based UL transmission, codebook-based PUSCH) may be limited according to either of the following methods 1 or 2.

[0092] [Restriction Method 1] The maximum number of ranks / layers N is specified in the specifications.

[0093] [Restriction Method 2] The maximum number of ranks / layers does not have to be specified in the specification, and it may mean a maximum of M ranks / layers. Upper layer signaling may set the number of ranks / layers to be limited to N, where N may depend on the reported UE capability signaling.

[0094] For a maximum number of ranks / layers N, the specification may define a new precoding matrix table (a precoding matrix corresponding to the number of layers and the TPMI index value) for 1 / 2 / ... / N layer transmission using N or M antenna ports with transform precoding disabled.

[0095] For a maximum number of ranks / layers N, the specification may define a new precoding matrix table (a precoding matrix corresponding to the TPMI index value) for transmitting at least one layer using N or M antenna ports with transform precoding enabled.

[0096] For a maximum number of ranks / layers N, the specification may define a new precoding matrix table (a precoding matrix corresponding to the TPMI index value) for 2-layer transmission using 6 antenna ports with transform precoding enabled.

[0097] According to the first embodiment described above, the transmit antenna configuration of the UE to support a number of layers greater than 4 can be properly reported to the network.

[0098] In each of the following embodiments, the maximum number of ranks / layers may be limited by N, where N may be set by upper-layer signaling, limited by specifications, or reported by UE capabilities.

[0099] <Second Embodiment> The second embodiment relates to push transmissions of UEs that support a number of layers greater than 4 (e.g., 6TX UE, 8TX UE).

[0100] PUSCHs with a layer count greater than 4 may be transmitted by Transport Block (TB) / Code Word (CW). The DCI (e.g., DCI format 0_1 / 0_2) scheduling such PUSCH may have at least one of the following fields having a size larger than the bit size of the existing DCI field: • SRS resource indicator field, • Pre-coding information field.

[0101] Note that the size of the SRS resource indicator field increases only in the case of non-codebook-based PUSCH; it does not need to increase in the case of codebook-based PUSCH (i.e., it can be 1 bit). This is because in the case of codebook-based PUSCH, if the number of SRS resources in the SRS resource set does not increase (for example, if the number of SRS resources set in the SRS resource set is 2), it is sufficient to indicate one SRI for PUSCH, and there is no need to increase the number of bits for the SRI.

[0102] For the precoding information field, a new precoding and layer count table may be defined for 6 / 8 antenna ports. This table may be associated with the precoding matrix table.

[0103] Note that the size of the 'Antenna ports' field in the DCI described above does not need to be increased. A new table for antenna ports may be defined for DMRS port indications with more than four layers. This will be explained in the fourth embodiment.

[0104] The above DCI may include two sets of fields, each containing a Modulation and Coding Scheme (MCS) field, a New Data Indicator (NDI) field, and a Redundancy Version (RV) field. One set of these fields may correspond to one TB. In other words, a UE may schedule two TBs using a DCI containing two sets of these fields.

[0105] According to the second embodiment described above, PUSCH transmissions using a number of layers greater than 4 can be appropriately controlled.

[0106] <Third Embodiment> The third embodiment relates to an enlarged SRS resource indicator field, as described in the second embodiment.

[0107] The third embodiment can be broadly categorized into the following embodiments, depending on how many SRS resources the UE configures in one SRS resource set, for up to 6 or 8 layers: • Embodiment 3.1: When up to 6 or 8 1-port SRS resources are configured in 1SRS resource set, • Embodiment 3.2: When up to 3 or 4 1-port SRS resources are configured in 1 SRS resource set.

[0108] As mentioned above, the SRS resource set in the third embodiment may be an SRS resource set intended for use as a non-code book, and PUSCH may be a non-code book-based PUSCH.

[0109] [Embodiment 3.1] After an SRS transmission is made by the UE, the base station may instruct the UE to provide up to 6 or 8 SRS resources via the DCI. The size of the SRS resource indicator field included in the DCI may be expressed by the following formula 1.

[0110]

number

[0111] Here, N SRS This is the number of SRS resources set in an SRS resource set whose purpose is a non-code book, L max This may be given by a higher layer parameter (e.g., the RRC parameter "maxMIMO-Layers") indicating the maximum number of MIMO layers used for PUSCH, or by the maximum number of layers for PUSCH supported by the UE for non-codebook-based operation.

[0112] Equation 1 itself is the same in Rel.15 NR. SRS , L max While these values ​​were 4 or less in Rel.15 NR, in Embodiment 3.1 they may be 6 or 8, respectively, thus increasing the size of the SRS resource indicator field compared to that in Rel.15 NR.

[0113] [Embodiment 3.2] In Embodiment 3.2, the UE may be configured with two SRS resource sets, each of which may contain up to three or four 1-port SRS resources.

[0114] In Embodiment 3.2, the UE may receive a DCI that includes two SRS resource indicator fields. The UE may assume that the DCI includes two SRS resource indicator fields when it configures "2 SRS resources for a non-code book base".

[0115] After the UE has transmitted SRS, the base station may instruct the UE to provide up to three or four SRS resources for each SRS resource indicator field in the DCI. One SRS resource indicator field may correspond to one TB.

[0116] For PUSCH transmissions with a specific number of layers (e.g., 4) or less, one SRS resource indicator field may indicate up to four SRS resources, and another SRS resource indicator field may indicate no SRS resources.

[0117] For PUSCH transmissions with a number of layers greater than a certain number of layers (e.g., 4), the SRS resources specified by each SRS resource indicator field may be subject to certain constraints. For example, the number of SRS resources that can be specified by two SRS resource indicator fields may be at least one, such as (3+2), (2+3), (3+3), (3+4), (4+3), (4+4), etc.

[0118] In this disclosure, when we refer to the X+Y layer (where X and Y are numbers), we may mean X+Y layer transmission based on the specification of X+Y SRS resources using the two SRS resource indicator fields shown in Embodiment 3.2.

[0119] According to the third embodiment described above, SRI can be appropriately specified for non-codebook-based PUSCH that uses a number of layers greater than 4.

[0120] <Fourth Embodiment> A fourth embodiment relates to a table of antenna ports for DMRS port indication with a number of layers greater than 4 when the transform precoder is disabled.

[0121] For codebook-based pushes, the UE determines the rank (number of layers) for push transmission based on the DCI precoding information field. For non-codebook-based pushes, the UE determines the rank (number of layers) for push transmission based on the DCI SRS resource indicator field.

[0122] The UE may then determine the table of antenna ports corresponding to the determined rank based on the enabled / disabled transform precoder, the DMRS type of PUSCH set by upper-layer signaling (which may be set by the RRC parameter "dmrs-Type"), and the maximum length of the DMRS (which may be set by the RRC parameter "maxLength").

[0123] Additionally, the value of the DCI antenna port field may determine the entry in the referenced table (the entry corresponds to a set of elements such as the number of CDM groups, the DMRS antenna port index, and the number of front-load symbols).

[0124] [When DMRS type = 1 and DMRS maximum length = 1] If DMRS type=1 and DMRS maximum length=1, transmissions up to rank 4 may be supported. In other words, a UE set to DMRS type=1 and DMRS maximum length=1 will not support transmissions greater than rank 4.

[0125] [When DMRS type = 1 and maximum DMRS length = 2] If DMRS type = 1 and DMRS maximum length = 2, transmission up to rank 8 may be supported.

[0126] Figures 5A-5D show an example of a table of reference antenna ports in the fourth embodiment, where the transform precoder is disabled, DMRS type = 1, and DMRS maximum length = 2.

[0127] Figure 5A shows an example of a table of antenna ports corresponding to rank 5. In this example, values ​​from 0 to 3 in the antenna port field are associated with different sets of DMRS ports (5 antenna ports total). Note that the correspondence between values ​​and entry contents is not limited to this example. Other examples are similar.

[0128] In Figure 5A, 2+3 layers and 3+2 layers may be supported. Note that only a portion of the illustrated entries may be supported. For example, only the entries for DMRS ports 0-4 may be supported for the 2+3 layer, and only the entries for DMRS ports 0, 1, 2, 3, and 6 may be supported for the 3+2 layer.

[0129] Figure 5B shows an example of an antenna port table corresponding to rank 6. In this example, values ​​from 0 to 2 in the antenna port field are associated with different sets of DMRS ports (6 antenna ports in total).

[0130] In Figure 5B, 4+2 layers, 2+4 layers, and 3+3 layers may be supported. Furthermore, only specific X and Y combinations (e.g., 3+3) for the X+Y layer may be supported.

[0131] Figure 5C shows an example of an antenna port table corresponding to rank 7. In this example, each value from 0 to 1 in the antenna port field corresponds to a different set of DMRS ports (7 antenna ports in total).

[0132] In Figure 5C, 4+3 layers and 3+4 layers may be supported.

[0133] Figure 5D shows an example of an antenna port table corresponding to rank 8. In this example, a set of DMRS ports (8 antenna ports) is associated with the value of the antenna port field = 0.

[0134] In Figure 5D, only 4+4 layers may be supported.

[0135] [When DMRS type = 2 and DMRS maximum length = 1] If DMRS type = 2 and DMRS maximum length = 1, transmission up to rank 6 may be supported, or only transmission up to rank 4 may be supported, or transmission up to rank 5 may be supported but rank 6 (e.g., 4+2 layers) transmission is not supported.

[0136] Figures 6A and 6B show an example of a table of reference antenna ports in the fourth embodiment, where the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 1.

[0137] Figure 6A shows an example of a table of antenna ports corresponding to rank 5. In this example, a set of DMRS ports (5 antenna ports) is associated with the value of the antenna port field = 0.

[0138] Figure 6B shows an example of an antenna port table corresponding to rank 6. In this example, a set of DMRS ports (6 antenna ports) is associated with the value of the antenna port field = 0.

[0139] [When DMRS type = 2 and DMRS maximum length = 2] If DMRS type = 2 and DMRS maximum length = 2, transmission up to rank 8 may be supported.

[0140] Figures 7A-7D show an example of a table of reference antenna ports in the fourth embodiment, where the transform precoder is disabled, DMRS type = 2, and DMRS maximum length = 2.

[0141] Figure 7A shows an example of a table of antenna ports corresponding to rank 5. In this example, values ​​from 0 to 2 in the antenna port field are associated with different sets of DMRS ports (5 antenna ports in total).

[0142] Figure 7B shows an example of an antenna port table corresponding to rank 6. In this example, each value in the antenna port field from 0 to 3 corresponds to a different set of DMRS ports (6 antenna ports in total).

[0143] In Figure 7B, 4+2 layers, 2+4 layers, and 3+3 layers may be supported. Furthermore, only specific X and Y combinations (e.g., 3+3) for the X+Y layer may be supported. For example, only the entry corresponding to the value = 3 in the antenna port field of Figure 7B may be supported for 3+3.

[0144] Figure 7C shows an example of a table of antenna ports corresponding to rank 7. In this example, values ​​from 0 to 3 in the antenna port field are associated with different sets of DMRS ports (7 antenna ports in total).

[0145] Figure 7D shows an example of an antenna port table corresponding to rank 8. In this example, a set of DMRS ports (8 antenna ports) is associated with values ​​of 0 to 2 in the antenna port field.

[0146] Regarding Figure 7D, only entries corresponding to 4+4 layers may be supported.

[0147] According to the fourth embodiment described above, for PUSCH using a number of layers greater than 4 when the transform precoder is disabled, the antenna port can be appropriately specified.

[0148] <Other Embodiments> A higher-layer parameter (RRC information element) / UE capability may be defined corresponding to at least one function (feature) in each embodiment. The UE capability may indicate whether or not it supports this function.

[0149] A UE that has the corresponding higher-layer parameters set may perform that function. It may also be stipulated that "a UE that does not have the corresponding higher-layer parameters set will not perform that function (for example, apply the behavior of Rel.15 / 16)."

[0150] A UE that has reported UE capability indicating support for that function may perform that function. It may also be stipulated that "a UE that has not reported UE capability indicating support for that function shall not perform that function (for example, apply the behavior of Rel. 15 / 16)."

[0151] If the UE reports its capability to support the function and the corresponding higher-layer parameters are set, the UE may perform the function. It may also be stipulated that "if the UE does not report its capability to support the function, or if the corresponding higher-layer parameters are not set, the UE will not perform the function (for example, apply the behavior of Rel. 15 / 16)."

[0152] UE capabilities may indicate at least one of the following: Information regarding at least one of M and N. For example, how many transmit antenna ports the UE supports (maximum number of transmit antenna ports M). For example, how many ranks / layers the UE supports (maximum number of ranks / layers M). M and N may be reported jointly. For example, combinations of M and N may be reported. Information regarding at least one of M and N may be reported separately for codebook-based UL transmissions and non-codebook-based UL transmissions, or jointly for codebook-based UL transmissions and non-codebook-based UL transmissions. • Whether or not to support new TPMI tables for codebook MIMO. How many SRS resources / SRS resource sets with codebook / non-codebook uses will the UE support? (Maximum number of SRS resources / SRS resource sets with codebook / non-codebook uses).

[0153] Based on the above UE capabilities / higher layer parameters, the UE can achieve the above functions while maintaining compatibility with existing specifications.

[0154] (Wireless communication system) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any or a combination thereof of the wireless communication methods according to the above embodiments of this disclosure.

[0155] Figure 8 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0156] Furthermore, the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and so on.

[0157] In EN-DC, the LTE (E-UTRA) base station (eNB) is the Master Node (MN), and the NR base station (gNB) is the Secondary Node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0158] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0159] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

[0160] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of Carrier Aggregation (CA) using multiple Component Carriers (CC) and Dual Connectivity (DC).

[0161] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a 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 above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may fall in a frequency band higher than FR2.

[0162] Furthermore, the user terminal 20 may communicate using at least one of the following methods at each CC: Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0163] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, if NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0164] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0165] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0166] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0167] The wireless access method may also be called a waveform. In 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 UL and DL wireless access methods.

[0168] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, shared by each user terminal 20.

[0169] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0170] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0171] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0172] Furthermore, the DCI that schedules PDSCH may be called a DL assignment or DL ​​DCI, and the DCI that schedules PUSCH may be called a UL grant or UL DCI. Furthermore, PDSCH may be interpreted as DL data, and PUSCH may be interpreted as UL data.

[0173] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with a particular search space based on the search space configuration.

[0174] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0175] PUCCH may transmit uplink control information (UCI) which includes at least one of the following: channel state information (CSI), delivery acknowledgment (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0176] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[0177] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc., may be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc., may be transmitted.

[0178] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. SS, SSB, etc., may also be called reference signals.

[0179] Furthermore, in the wireless communication system 1, the Uplink Reference Signal (UL-RS) may transmit the Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. The DMRS may also be called the User-Specific Reference Signal (UE-specific Reference Signal).

[0180] (base station) Figure 9 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, transceiver unit 120, transceiver antenna 130, and transmission line interface 140 may be provided.

[0181] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0182] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0183] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of radio resources, etc.

[0184] The transmitting / receiving 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 transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0185] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0186] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0187] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0188] The transmitting / receiving unit 120 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0189] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., to generate a bit sequence to be transmitted.

[0190] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, 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, and output a baseband signal.

[0191] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

[0192] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0193] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing to the acquired baseband signal, such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0194] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to 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 also measure received power (e.g., Reference Signal Received Power (RSRP)), reception 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.

[0195] The transmission path interface 140 may send 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.

[0196] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0197] The control unit 110 may determine the number of antenna ports M and the number of layers N which is less than M. The transmitting / receiving unit 120 may receive a physical uplink sharing channel using N layers.

[0198] (User terminal) Figure 10 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0199] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0200] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0201] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0202] The transmitting / receiving 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 transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0203] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0204] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0205] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0206] The transmitting / receiving unit 220 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0207] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc., on data and control information acquired from the control unit 210, etc., to generate a bit sequence to be transmitted.

[0208] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0209] Whether or not to apply DFT processing may be based on the settings of the transform precoder (precoding). The transmitting / receiving unit 220 (transmission processing unit 2211) may, for a certain channel (e.g., PUSCH), perform DFT processing as part of the transmission process in order to transmit that channel using a DFT-s-OFDM waveform if the transform precoder is enabled, or it may not perform DFT processing as part of the transmission process if the transform precoder is not enabled.

[0210] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0211] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0212] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0213] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0214] In this disclosure, the transmitting and receiving units of the user terminal 20 may consist of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0215] The control unit 210 may determine the number of antenna ports M and the number of layers N which is less than M. The transmitting / receiving unit 220 may transmit a physical uplink sharing channel using N layers.

[0216] The control unit 210 may report capability information regarding the combination of M and N.

[0217] The control unit 210 may control the reception of instruction information relating to a combination of M and N or N, and may determine M and N based on the instruction information.

[0218] The control unit 210 may determine the N antenna ports based on either information regarding N antenna port numbers among the M antenna ports, or information regarding sounding reference signal resources associated with the N antenna ports. The transmitting / receiving unit 220 may transmit the physical uplink shared channel using the N antenna ports and the N layers.

[0219] (Hardware configuration) The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0220] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0221] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 11 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0222] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0223] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented using one or more chips.

[0224] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or to control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0225] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0226] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0227] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of this disclosure.

[0228] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital multipurpose disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be called an auxiliary storage device.

[0229] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated implementations of a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0230] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0231] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0232] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0233] (modified version) In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0234] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0235] Here, the neuralelogy may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neuralelogy may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain.

[0236] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0237] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0238] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0239] For example, one subframe may be called TTI, multiple consecutive subframes may be called TTI, or one slot or one mini-slot may be called TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0240] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0241] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0242] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0243] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in 3GPP Rel.8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a sub slot, or a slot.

[0244] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0245] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0246] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0247] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0248] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0249] A Bandwidth Part (BWP) (also called a partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0250] A BWP may include UL BWPs (BWPs for UL) and DL BWPs (BWPs for DL). One or more BWPs may be configured within a single carrier for a UE.

[0251] At least one of the configured BWPs may be active, and the UE does not need to assume that it will transmit or receive a given channel / signal outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0252] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative examples. For instance, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots within a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0253] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or corresponding other information. For example, wireless resources may be indicated by a predetermined index.

[0254] The names used for parameters and other elements in this disclosure are not restrictive in any way. Furthermore, mathematical formulas and other elements that use these parameters may differ from those expressly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0255] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the 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.

[0256] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0257] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0258] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof).

[0259] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Element (CE).

[0260] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not notifying the specified information or by notifying other information).

[0261] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0262] 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, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0263] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0264] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0265] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "quasi-co-location (QCL)," "transmission configuration indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," and "panel" may be used interchangeably.

[0266] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0267] 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 smaller area 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.

[0268] In this disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0269] 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.

[0270] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves without a driver (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0271] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, uplink channel and downlink channel may be interpreted as sidelink channel.

[0272] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0273] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes with base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0274] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to that specific order.

[0275] Each aspect / embodiment described in this disclosure includes 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) (xG (where x is, for example, an integer or 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®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), and IEEE This may be applied to systems utilizing 802.20, Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, as well as next-generation systems that extend these. It may also be applied in combination with multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0276] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0277] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0278] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to include judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0279] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0280] Furthermore, "judgment (decision)" can be considered as "judging (deciding)" something like resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can be considered as "judging (deciding)" something about an action.

[0281] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0282] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0283] In this disclosure, when two elements are connected, they can be considered to be “connected” or “coupled” to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, or optical domain (both visible and invisible).

[0284] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0285] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0286] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0287] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The invention described herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined in the claims. Therefore, the descriptions herein are for illustrative purposes only and do not imply any limitation on the invention described herein.

Claims

1. A transmitting unit that reports capability information indicating that it supports transmission with a number of antenna ports greater than 4, A receiver unit that receives upper-layer signaling indicating the maximum number of ranks for transmitting a physical uplink shared channel (PUSCH), It has a control unit that controls the transmission of the PUSCH based on the number of antenna ports M and the number of layers N, The number of layers N is greater than 4, and the number of antenna ports M is greater than the number of layers N. The number of layers N is determined based on the capability information and the higher layer signaling. If the transform precoder is disabled, the demodulation reference signal (DMRS) port is determined based on the DMRS type, the maximum length of the DMRS, and the rank for transmitting the PUSCH. The aforementioned rank refers to terminals with a rank greater than 4.

2. The terminal according to claim 1, wherein the downlink control information for scheduling the PUSCH includes a modulation and coding scheme (MCS) field, a new data instruction (NDI) field, and a redundant version (RV) field for two transport blocks (TBs).

3. A step of reporting capability information indicating that it supports transmission with a number of antenna ports greater than 4, The steps include receiving upper-layer signaling indicating the maximum number of ranks for transmitting a physical uplink shared channel (PUSCH), The process includes the step of controlling the transmission of the PUSCH based on the number of antenna ports M and the number of layers N. The number of layers N is greater than 4, and the number of antenna ports M is greater than the number of layers N. The number of layers N is determined based on the capability information and the higher layer signaling. If the transform precoder is disabled, the demodulation reference signal (DMRS) port is determined based on the DMRS type, the maximum length of the DMRS, and the rank for transmitting the PUSCH. The aforementioned rank is greater than 4, and is a wireless communication method for a terminal.

4. A receiving unit that receives capability information indicating that it supports transmission with a number of antenna ports greater than 4, A transmitter unit that transmits upper-layer signaling indicating the maximum number of ranks for transmitting a physical uplink shared channel (PUSCH), It has an antenna port number M and a control unit that controls the reception of the PUSCH based on the number of layers N, The number of layers N is greater than 4, and the number of antenna ports M is greater than the number of layers N. The number of layers N is determined based on the capability information and the higher layer signaling. If the transform precoder is disabled, the demodulation reference signal (DMRS) port is determined based on the DMRS type, the maximum length of the DMRS, and the rank for transmitting the PUSCH. The aforementioned rank refers to base stations greater than 4.

5. A system including terminals and base stations, The aforementioned terminal is A transmitting unit that reports capability information indicating that it supports transmission with a number of antenna ports greater than 4, A receiver unit that receives upper-layer signaling indicating the maximum number of ranks for transmitting a physical uplink shared channel (PUSCH), It has a control unit that controls the transmission of the PUSCH based on the number of antenna ports M and the number of layers N, The number of layers N is greater than 4, and the number of antenna ports M is greater than the number of layers N. The number of layers N is determined based on the capability information and the higher layer signaling. If the transform precoder is disabled, the demodulation reference signal (DMRS) port is determined based on the DMRS type, the maximum length of the DMRS, and the rank for transmitting the PUSCH. The aforementioned rank is greater than 4. The aforementioned base station is A system having a transmitting unit that transmits the aforementioned upper-layer signaling.

Images