Terminal, wireless communication method, base station and system

Abstract

A terminal according to one embodiment of the present disclosure includes: a transmission unit that transmits capability information indicating that transmission with a number of antenna ports greater than four is supported; and a control unit that controls uplink transmission that uses a number of layers greater than four. Said one embodiment makes it possible to suitably control UL transmission with a number of layers greater than four.

Description

[Technical field]

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

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been specified for the purpose of achieving higher data rates and lower latency (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of achieving higher capacity and greater sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later, etc.) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0005] In Rel.15 NR, uplink (UL) Multi-Input Multi-Output (MIMO) transmission with up to four layers is supported. For future NR, support for UL transmission with more than four layers is being considered to achieve higher spectral efficiency.

[0006] However, there is still no study on how the network should know the UE's antenna configuration and how the network should make the UE perform the UL transmission for UL transmission with a layer number greater than 4. If this control is not clarified, there is a risk that the increase in communication throughput will be suppressed.

[0007] Therefore, the present disclosure provides a terminal and a wireless communication method capable of appropriately controlling UL transmission of a layer number greater than four. 、 base station and systems One of the aims is to provide. [Means for solving the problem]

[0008] According to one embodiment of the present disclosure, the terminal is greater than four layer Number Uplink A transmitter that transmits capability information indicating that the transmitter supports the transmission; When two sounding reference signal (SRS) resource sets whose usage is non-codebook are configured, the downlink control information (DCI) including two SRS resource indicator fields is used to and a control unit that controls uplink transmission. Effect of the Invention

[0009] According to one embodiment of the present disclosure, UL transmission with a layer number greater than four can be appropriately controlled. [Brief description of the drawings]

[0010] [Figure 1] 1A and 1B are diagrams illustrating an example of UE capability information related to antenna coherency according to the first embodiment. [Diagram 2]2A to 2D are diagrams illustrating an example of a table of antenna ports to be referred to when the transform precoder is disabled, the DMRS type is 1, and the maximum DMRS length is 2 in the fourth embodiment. [Diagram 3] 3A and 3B are diagrams showing an example of a table of antenna ports to be referred to when the transform precoder is disabled, the DMRS type is 2, and the maximum DMRS length is 1 in the fourth embodiment. [Figure 4] 4A to 4D are diagrams illustrating an example of a table of antenna ports to be referred to when the transform precoder is disabled, the DMRS type is 2, and the maximum DMRS length is 2 in the fourth embodiment. [Diagram 5] FIG. 5 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 6] FIG. 6 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 7] FIG. 7 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 8] FIG. 8 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (SRS, PUSCH transmission control) In Rel.15 NR, a UE may receive information (SRS configuration information, for example, parameters in the RRC control element "SRS-Config") used to transmit a measurement reference signal (e.g., a Sounding Reference Signal (SRS)).

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

[0013] An SRS resource set may be associated with (group together) a number of SRS resources, each of which may be identified by an SRS Resource Indicator (SRI) or SRS Resource Identifier (ID).

[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 SRS usage.

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

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

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

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

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

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

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

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

[0023] When the UE is configured with spatial relationship information regarding the SSB or CSI-RS and the SRS for a certain SRS resource, the UE may transmit the SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter (spatial domain receive filter) 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] When the UE is configured with spatial relationship information regarding a certain SRS (target SRS) resource between another SRS (reference SRS) and the SRS (target SRS), the UE may transmit the target SRS resource using the same spatial domain filter (spatial domain transmit filter) as the spatial domain filter (spatial domain transmit filter) for transmitting the reference SRS. That is, in this case, the UE may assume that the UE transmit beam of the reference SRS and the UE transmit beam of the target SRS are the same.

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

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

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

[0028] In Rel.15 / 16 NR, when non-codebook-based transmission is used for PUSCH, a non-codebook-used SRS resource set having up to four SRS resources may be configured for the UE by RRC, and one or more of the up to four SRS resources may be indicated by DCI (a 2-bit SRI field).

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

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

[0031] In addition, the UE may be configured to use codebook-based PUSCH transmission or non-codebook-based PUSCH transmission by a higher layer parameter "txConfig" indicating a transmission scheme. The parameter may indicate a value of "codebook" or "non-codebook".

[0032] In this disclosure, codebook-based PUSCH (codebook-based PUSCH transmission, codebook-based transmission) may refer to PUSCH when "codebook" is configured as a transmission scheme in a UE. In this disclosure, non-codebook-based PUSCH (non-codebook-based PUSCH transmission, non-codebook-based transmission) may refer to PUSCH when "non-codebook" is configured as a transmission scheme in a UE.

[0033] (High Rank Transmission) In Rel.15 NR, uplink (UL) Multi-Input Multi-Output (MIMO) transmission with up to four layers is supported. For future NR, support for UL transmission with more than four layers is being considered to achieve higher spectral efficiency.

[0034] However, there is still no study on how the network should know the UE's antenna configuration and how the network should make the UE perform the UL transmission for UL transmission with a layer number greater than 4. If this control is not clarified, there is a risk that the increase in communication throughput will be suppressed.

[0035] Therefore, the present inventors have conceived a method for appropriately performing UL transmission with a layer number greater than four.

[0036] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to the embodiments may be applied independently or in combination. The embodiments of the present disclosure may be used when the UL TCI state is not introduced.

[0037] In the present disclosure, "A / B" may mean "at least one of A and B."

[0038] In the present disclosure, higher layer signaling may be, for example, any one or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like.

[0039] The MAC signaling may be, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0040] The physical layer signaling may be, for example, Downlink Control Information (DCI).

[0041] In the present disclosure, the terms activate, deactivate, indicate, select, configure, update, determine, etc. may be read as interchangeable terms.

[0042] In the present disclosure, panel, beam, panel group, beam group, Uplink (UL) transmitting entity, TRP, spatial relationship information (SRI), spatial relationship, control resource set (CORESET), Physical Downlink Shared Channel (PDSCH), codeword, base station, a specific antenna port (e.g., a DeModulation Reference Signal (DMRS) port), a specific antenna port group (e.g., a DMRS port group), a specific group (e.g., a Code Division Multiplexing (CDM) group, a specific reference signal group, a CORESET group), a specific resource (e.g., a specific reference signal resource), a specific resource set (e.g., a specific reference signal resource set), a CORESET pool, a PUCCH group (PUCCH resource group), a spatial relationship group, a downlink TCI state (DL TCI state), an uplink TCI state (UL TCI state), a unified TCI state, a QCL, and the like may be read as interchangeable.

[0043] Furthermore, the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interchangeable. The "spatial relationship information" may be interchangeable with "set of spatial relationship information", "one or more pieces of spatial relationship information", etc. The TCI state and the TCI may be interchangeable with each other.

[0044] In the present disclosure, the terms index, ID, indicator, and resource ID may be interchangeable. Also, in the present disclosure, the terms sequence, list, set, group, cluster, and subset may be interchangeable.

[0045] In the description of the following embodiments, terms such as "Spatial Relation Information (SRI)", "spatial relationship 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 interchangeable.

[0046] (Wireless communication method) <First embodiment> The first embodiment relates to a transmit antenna configuration of a UE to support a number of layers greater than four.

[0047] The UE may report UE capability information to the network indicating that the UE supports transmission with a number of antenna ports greater than four. The UE capability information may be referred to as UE capability information related to transmit antenna configuration. The UE capability information related to transmit antenna configuration may include information on the number of transmit antenna ports (e.g., 6, 8, etc.) supported by the UE, and may include information on the maximum number of layers for codebook-based PUSCH / non-codebook-based PUSCH supported by the UE.

[0048] The information on the maximum number of layers for the codebook-based PUSCH and the information on the maximum number of layers for the non-codebook-based PUSCH may be indicated by, for example, the RRC parameters "maxNumberMIMO-LayersCB-PUSCH" and "maxNumberMIMO-LayersNonCB-PUSCH", respectively. Note that any parameter name in the present disclosure may be given a suffix indicating a specific release (e.g., "r_18") or the like.

[0049] The UE may report UE capability information related to antenna coherency to the network. The UE capability information related to antenna coherency may be included in the UE capability information related to the transmit antenna configuration or may be included in another UE capability information. The UE capability information related to antenna coherency may be indicated, for example, by the RRC parameter "pusch-TransCoherence".

[0050] The UE capability information regarding antenna coherency may include information regarding at least one of antenna assumptions and codebook subsets.

[0051] For example, the UE capability information regarding the antenna coherency may be specified by "fullyAndPartialAndNonCoherent", "partialAndNonCoherent", "noncoherent", etc.

[0052] The UE capability information regarding the antenna coherency may also indicate a set of coherent antennas, or the number of ports included in the set, or the number of sets. For example, a UE that supports transmission of six antenna ports may report "(X1, X2, X3)" as the UE capability information regarding the antenna coherency.

[0053] Here, Xi (i is an integer) indicates the number of antenna ports included in a set of one or more coherent antenna ports. Xi can take a value between 0 and the maximum number of antenna ports. Σ i Xi may correspond to the maximum number of antenna ports supported by the UE.

[0054] Xi (i is an integer) may indicate the number of ports included in one frame, and in this case, the UE capability information regarding antenna coherency may indicate the number of ports included in each frame. Note that a frame is a unit of grouping / pairing antenna ports, and may be read as a panel, panel group, antenna group, antenna port group, antenna port set, beam group, etc.

[0055] 1A and 1B are diagrams illustrating an example of UE capability information related to antenna coherency according to the first embodiment. In this example, a case is described in which the UE supports transmission of six antenna ports.

[0056] Figure 1A corresponds to a transmit antenna configuration in which all antenna ports are coherent within a frame. In Figure 1A, the UE may report (X1, X2, X3) = (6, 0, 0) since all six antenna ports (ports 1-6) are coherent.

[0057] Figure 1B corresponds to a transmit antenna configuration with three combinations (frames) of two antenna ports that are coherent within a frame. Antenna ports between different frames are non-coherent. In this case, the UE may report (X1, X2, X3) = (2, 2, 2).

[0058] A UE that supports transmission of 8 antenna ports may report "(X1, X2, X3, X4)" as the UE capability information for antenna coherency. If all 8 antenna ports are coherent, the UE may report (X1, X2, X3, X4) = (8, 0, 0, 0).

[0059] (X1, X2, X3, X4)=(4, 4, 0, 0) may indicate a transmit 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 non-coherent.

[0060] (X1, X2, X3, X4) = (2, 2, 2, 2) may denote a transmit antenna configuration having four frames, where a pair of two antenna ports within a frame is coherent, and the antenna ports between different frames are non-coherent.

[0061] At least one of the Xi to be reported may be omitted. For example, a UE having an antenna configuration of (X1, X2, X3, X4)=(2, 2, 2, 2) may report (X1, X2, X3)=(2, 2, 2) as the UE capability information related to antenna coherency. When a base station receiving this UE capability information understands that the UE supports 8 antenna ports based on the UE capability information related to the transmit antenna configuration, the base station may derive that X4=8-(X1+X2+X3)=2. In this way, when the report of at least one Xi is omitted, an increase in communication overhead of the UE capability information can be suppressed.

[0062] The array consisting of the above-mentioned Xi may be called antenna coherency information, antenna coherency type, etc.

[0063] A UE that supports transmission on a number of antenna ports greater than four may support a number of UL layers greater than four. For example, a UE that supports six transmit antenna ports (which may be referred to as a 6TX UE) may support up to a particular number of layers (e.g., 4 / 5 / 6) for the UL. For example, a UE that supports eight transmit antenna ports (which may be referred to as an 8TX UE) may support up to a particular number of layers (e.g., 4 / 5 / 6 / 7 / 8) for the UL.

[0064] A 6TX UE may use a table of precoding matrices for a specific number (eg, 1 / 2 / 3 / 4 / 5 / 6) of layer transmissions using 6 antenna ports as a table of precoding matrices when the transform precoder is disabled.

[0065] The 6TX UE may utilize a table of precoding matrices for at least one layer transmission with six antenna ports as the table of precoding matrices when the transform precoder is enabled. The 6TX UE may utilize a table of precoding matrices for two layer transmission with six antenna ports as the table of precoding matrices when the transform precoder is enabled.

[0066] An 8TX UE may use a table of precoding matrices for a specific number (eg, 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8) of layer transmissions using 8 antenna ports as a table of precoding matrices when the transform precoder is disabled.

[0067] The 8TX UE may utilize a table of precoding matrices for at least one layer transmission with eight antenna ports as the table of precoding matrices when the transform precoder is enabled. The 8TX UE may utilize a table of precoding matrices for two layer transmission with eight antenna ports as the table of precoding matrices when the transform precoder is enabled.

[0068] Note that the precoding matrix in this disclosure may correspond to the TPMI index, and the table of precoding matrices (which may be called a codebook) may be different for each antenna coherency type.

[0069] A UE that supports transmission with a number of antenna ports greater than four (eg, 6TX UE, 8TX UE) may report UE capability information indicating the maximum number of layers of UL transmission that it supports.

[0070] The UE may report UE capability information indicating whether it supports two-layer UL transmission when the transform precoder is enabled.

[0071] According to the first embodiment described above, the transmitting antenna configuration of the UE for supporting a number of layers greater than four can be appropriately reported to the network.

[0072] <Second embodiment> The second embodiment relates to PUSCH transmission for UEs supporting a number of layers greater than four (eg, 6TX UEs, 8TX UEs).

[0073] A PUSCH with a layer number greater than 4 may be transmitted by a Transport Block (TB) / Code Word (CW). A DCI (e.g., DCI format 0_1 / 0_2) that schedules the PUSCH may have at least one of the following fields with a size greater than the bit size of the existing DCI fields: · SRS resource indicator field, · Precoding information field.

[0074] Note that the size of the SRS resource indicator field increases only in the case of a non-codebook-based PUSCH, and does not need to be increased (i.e., it may be 1 bit) in the case of a codebook-based PUSCH. This is because, in the case of a codebook-based PUSCH and there is no increase in the number of SRS resources in an SRS resource set (for example, the number of SRS resources set in the SRS resource set is 2), it is sufficient to indicate one SRI for the PUSCH, and there is no need to increase the number of bits for the SRI.

[0075] For the precoding information field, a new precoding and layer number table for 6 / 8 antenna ports may be defined, which may be associated with the table of precoding matrices.

[0076] Note that the size of the antenna ports field of the DCI does not need to be increased. For DMRS port indication with a layer number greater than four layers, a new table for antenna ports may be defined. This will be described in the fourth embodiment.

[0077] The DCI may include two sets of fields, including a Modulation and Coding Scheme (MCS) field, a New Data Indicator (NDI) field, and a Redundancy Version (RV) field. Each set may correspond to one TB. In other words, the UE may be scheduled for two TBs by the DCI including two sets.

[0078] According to the second embodiment described above, PUSCH transmission using a layer count greater than four can be appropriately controlled.

[0079] <Third embodiment> The third embodiment relates to an increased size of the SRS resource indicator field described in the second embodiment.

[0080] The third embodiment can be broadly divided into the following embodiments according to how many SRS resources are configured in one SRS resource set for a UE for up to 6 or 8 layers: Embodiment 3.1: When up to 6 or 8 1-port SRS resources are configured in one SRS resource set, Embodiment 3.2: When up to three or four one-port SRS resources are configured in one SRS resource set.

[0081] As described above, the SRS resource set in the third embodiment may be an SRS resource set whose use is a non-codebook, and the PUSCH may be a non-codebook-based PUSCH.

[0082] [Embodiment 3.1] After the UE transmits the SRS, the base station may indicate up to 6 or 8 SRS resources to the UE through DCI. The size of the SRS resource indicator field included in the DCI may be expressed by the following Equation 1:

[0083]

number

[0084] Here, N SRS is the number of SRS resources set in the SRS resource set whose usage is non-codebook, and L max may be given by a higher layer parameter (e.g., the RRC parameter “maxMIMO-Layers”) indicating the maximum MIMO layers used for the PUSCH, or may be given by the maximum number of layers for the PUSCH supported by the UE for non-codebook based operation.

[0085] Equation 1 itself is the same in Rel.15 NR. SRS , L max etc., which have a value of 4 or less in Rel.15 NR, may be 6 or 8, respectively, in embodiment 3.1, so the size of the SRS resource indicator field increases from that in Rel.15 NR.

[0086] [Embodiment 3.2] In embodiment 3.2, the UE may be configured with two SRS resource sets, and each SRS resource set may include up to three or four one-port SRS resources.

[0087] In embodiment 3.2, the UE may receive a DCI including two SRS resource indicator fields. If the UE is configured with "2 SRS resources for non-codebook base", the UE may assume that the DCI includes two SRS resource indicator fields.

[0088] After the SRS transmission is performed by the UE, the base station may indicate up to 3 or 4 SRS resources to the UE per SRS resource indicator field of the DCI, where one SRS resource indicator field may correspond to one TB.

[0089] For PUSCH transmissions up to a certain number of layers (eg, four), one SRS resource indicator field may indicate up to four SRS resources and another SRS resource indicator field may indicate no SRS resources.

[0090] For PUSCH transmissions with a layer number greater than a certain layer number (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 may be specified by two SRS resource indicator fields may be at least one of (3+2), (2+3), (3+3), (3+4), (4+3), (4+4), etc.

[0091] In this disclosure, when expressed as X+Y layer (X and Y are numbers), it 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.

[0092] According to the third embodiment described above, it is possible to appropriately specify SRI for a non-codebook-based PUSCH using a number of layers greater than four.

[0093] <Fourth embodiment> The fourth embodiment relates to an antenna port table for DMRS port indication for layer numbers greater than four when the transform precoder is disabled.

[0094] The UE determines the rank (number of layers) for PUSCH transmission based on the precoding information field of the DCI for a codebook-based PUSCH, and determines the rank (number of layers) for PUSCH transmission based on the SRS resource indicator field of the DCI for a non-codebook-based PUSCH.

[0095] The UE may then determine the table of antenna ports corresponding to the determined rank based on whether the transform precoder is enabled or disabled, the DMRS type of the PUSCH set by higher layer signaling (which may be set by the RRC parameter "dmrs-Type"), and the value of the maximum length of the DMRS (which may be set by the RRC parameter "maxLength").

[0096] In addition, the value of the antenna port field of the DCI may determine the table entry to be referenced (the entry corresponds to a set of the number of CDM groups, the antenna port index of the DMRS, the number of front-load symbols, etc.).

[0097] [DMRS type = 1, DMRS maximum length = 1] In the case of DMRS type=1, DMRS max length=1, transmissions up to rank 4 may be supported. In other words, a UE configured with DMRS type=1 and DMRS max length=1 does not support transmissions greater than rank 4.

[0098] [DMRS type = 1, DMRS maximum length = 2] If DMRS type=1, max DMRS length=2, transmissions up to rank 8 may be supported.

[0099] 2A to 2D are diagrams illustrating an example of a table of antenna ports to be referred to when the transform precoder is disabled, the DMRS type is 1, and the maximum DMRS length is 2 in the fourth embodiment.

[0100] 2A is an example of a table of antenna ports corresponding to rank 5. In this example, different sets of DMRS ports (number of antenna ports: 5) are associated with the antenna port field values ​​= 0 to 3. Note that the correspondence between values ​​and entry contents is not limited to this. Other examples are similar.

[0101] In Figure 2A, 2+3 layers and 3+2 layers may be supported. Note that only some of the illustrated entries may be supported. For example, only the entries for DMRS ports 0-4 may be supported for 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.

[0102] 2B is an example of a table of antenna ports corresponding to rank 6. In this example, different sets of DMRS ports (number of antenna ports: 6) are associated with the antenna port field values ​​= 0 to 2.

[0103] In Figure 2B, 4+2 layers, 2+4 layers, and 3+3 layers may be supported, although only certain X, Y combinations (e.g., 3+3) for an X+Y layer may be supported.

[0104] 2C is an example of a table of antenna ports corresponding to rank 7. In this example, different sets of DMRS ports (7 antenna ports) are associated with the antenna port field values ​​= 0 to 1.

[0105] In FIG. 2C, 4+3 and 3+4 layers may be supported.

[0106] 2D is an example of a table of antenna ports corresponding to rank 8. In this example, a set of DMRS ports (number of antenna ports: 8) is associated with the value of the antenna port field=0.

[0107] In FIG. 2D, only 4+4 layers may be supported.

[0108] [DMRS type = 2, DMRS maximum length = 1] In the case of DMRS type=2 and max DMRS length=1, transmissions up to rank 6 may be supported, or only transmissions up to rank 4 may be supported, or transmissions of rank 6 (e.g., 4+2 layers) may not be supported and only transmissions up to rank 5 may be supported.

[0109] 3A and 3B are diagrams showing an example of a table of antenna ports to be referred to when the transform precoder is disabled, the DMRS type is 2, and the maximum DMRS length is 1 in the fourth embodiment.

[0110] 3A is an example of a table of antenna ports corresponding to rank 5. In this example, a set of DMRS ports (number of antenna ports: 5) is associated with the value of the antenna port field=0.

[0111] 3B is an example of a table of antenna ports corresponding to rank 6. In this example, a set of DMRS ports (number of antenna ports: 6) is associated with the value of the antenna port field=0.

[0112] [DMRS type = 2, DMRS maximum length = 2] If DMRS type=2, max DMRS length=2, transmission of up to rank 8 may be supported.

[0113] 4A to 4D are diagrams illustrating an example of a table of antenna ports to be referred to when the transform precoder is disabled, the DMRS type is 2, and the maximum DMRS length is 2 in the fourth embodiment.

[0114] 4A is an example of a table of antenna ports corresponding to rank 5. In this example, different DMRS port sets (number of antenna ports: 5) are associated with the antenna port field values ​​= 0 to 2.

[0115] 4B is an example of a table of antenna ports corresponding to rank 6. In this example, different sets of DMRS ports (number of antenna ports: 6) are associated with the antenna port field values ​​= 0 to 3.

[0116] In Figure 4B, 4+2 layers, 2+4 layers, and 3+3 layers may be supported. However, only certain X, Y combinations (e.g., 3+3) for X+Y layers may be supported. For example, only entries corresponding to the value=3 of the antenna port field in Figure 4B may be supported for 3+3.

[0117] 4C is an example of a table of antenna ports corresponding to rank 7. In this example, different sets of DMRS ports (7 antenna ports) are associated with the antenna port field values ​​= 0 to 3.

[0118] 4D is an example of a table of antenna ports corresponding to rank 8. In this example, a set of DMRS ports (number of antenna ports: 8) is associated with values ​​0 to 2 in the antenna port field.

[0119] For FIG. 4D, only entries corresponding to the 4+4 layer may be supported.

[0120] According to the fourth embodiment described above, it is possible to appropriately specify antenna ports for a PUSCH using a number of layers greater than four when the transform precoder is disabled.

[0121] (Wireless communication systems) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0122] 5 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0123] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of 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 the like.

[0124] 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.

[0125] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0126] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0127] 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).

[0128] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band 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 correspond to a frequency band higher than FR2.

[0129] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0130] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0131] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0132] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0133] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0134] The radio access scheme may be called a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0135] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as a downlink channel.

[0136] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0137] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0138] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0139] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0140] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0141] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0142] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0143] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0144] 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 the 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.

[0145] 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 the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0146] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0147] (base station) 6 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0148] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0149] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0150] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0151] The transceiver 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 transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0152] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0153] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0154] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0155] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0156] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0157] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0158] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0159] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0160] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0161] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0162] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0163] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0164] The transceiver 120 may receive capability information from the user terminal 20 indicating that the transceiver 120 supports transmission via a number of antenna ports greater than four.

[0165] Furthermore, the control unit 110 may control the user terminal 20 to perform uplink transmission using a layer count greater than four.

[0166] (User terminal) 7 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230.

[0167] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0168] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0169] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0170] 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 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0171] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0172] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0173] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0174] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0175] The transceiver 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, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0176] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0177] Whether or not to apply the DFT process may be based on the setting of a transform precoder. When a transform precoder is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and when a transform precoder is not enabled, the transceiver unit 220 may not perform the DFT process as the transmission process.

[0178] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0179] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0180] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0181] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), 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.

[0182] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0183] The transceiver 220 may transmit capability information (UE capability information) indicating that the UE supports transmission using a number of antenna ports greater than 4. The control unit 210 may also control uplink transmission (e.g., PUSCH) using a number of layers greater than 4.

[0184] The capability information may indicate the number of ports (or a set of such ports) that are included in a coherent antenna set.

[0185] The control unit 210 may control the uplink transmission based on downlink control information (DCI) including two SRS Resource Indicator (SRI) fields when two Sounding Reference Signal (SRS) resource sets whose usage is non-codebook are configured and up to three or four one-port SRS resources are configured in each SRS resource set.

[0186] The control unit 210 may control the uplink transmission when at least one of the demodulation reference signal (DMRS) type and the maximum DMRS length set is not 1 (for example, DMRS type=1 and DMRS maximum length=2).

[0187] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0188] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0189] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 8 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0190] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0191] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0192] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0193] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0194] Moreover, the processor 1001 reads out programs (program codes), 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 according to the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0195] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0196] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile 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 referred to as an auxiliary storage device.

[0197] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0198] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0199] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0200] 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), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0201] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0202] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed 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.

[0203] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0204] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0205] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0206] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0207] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0208] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0209] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0210] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0211] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0212] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0213] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0214] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0215] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0216] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0217] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0218] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0219] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given channel / signal outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0220] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0221] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0222] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0223] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. 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 voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0224] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0225] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0226] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0227] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0228] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0229] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0230] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0231] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0232] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0233] 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," "panel," and the like may be used interchangeably.

[0234] In this disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0235] 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 partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0236] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0237] 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 suitable terminology.

[0238] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. 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.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0239] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0240] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0241] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0242] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0243] Each aspect / embodiment described in the present disclosure may be implemented using any of a wide variety of standards, including 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 (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems using 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other appropriate wireless communication methods, next-generation systems that are based on these, etc. Also, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0244] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0245] Any reference to an element using a designation such as "first," "second," etc., 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 method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0246] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0247] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0248] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0249] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0250] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0251] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0252] In the present 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 "coupled" may also be interpreted in the same way as "different."

[0253] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0254] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0255] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

Claims

1. a transmitter for transmitting capability information indicating that uplink transmission with a number of layers greater than four is supported; A terminal having a control unit that controls the uplink transmission based on downlink control information (DCI) including two SRS resource indicator fields when two Sounding Reference Signal (SRS) resource sets whose purpose is a non-codebook are configured.

2. The terminal of claim 1, characterized in that the DCI includes a modulation and coding scheme (MCS) field, a new data indication (NDI) field and a redundancy version (RV) field.

3. The terminal of claim 1, characterized in that the demodulation reference signal (DMRS) port is determined based on the DMRS type, the maximum length of the DMRS, and the rank for the uplink transmission.

4. transmitting capability information indicating that uplink transmission with a number of layers greater than four is supported; and controlling the uplink transmission based on downlink control information (DCI) including two Sounding Reference Signal (SRS) resource indicator fields when two SRS resource sets whose usage is non-codebook are configured.

5. a receiver for receiving capability information indicating that uplink transmission with a number of layers greater than four is supported; and a control unit configured to control transmission of downlink control information (DCI) including two Sounding Reference Signal (SRS) resource indicator fields and scheduling the uplink transmission when two Sounding Reference Signal (SRS) resource sets whose usage is non-codebook are configured.

6. A system including a terminal and a base station, The terminal includes: a transmitter for transmitting capability information indicating that uplink transmission with a number of layers greater than four is supported; and a control unit configured to control the uplink transmission based on downlink control information (DCI) including two SRS resource indicator fields when two Sounding Reference Signal (SRS) resource sets having a non-codebook purpose are configured; The base station, A system having a receiver for receiving the capability information.

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