CN117356128A

CN117356128A - Terminal, wireless communication method and base station

Info

Publication number: CN117356128A
Application number: CN202180098608.0A
Authority: CN
Inventors: 越后春阳; 松村祐辉; 芝池尚哉; 原田浩树; 永田聪
Original assignee: NTT Docomo Inc
Current assignee: NTT Docomo Inc
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2024-01-05
Also published as: WO2022254550A1

Abstract

The terminal according to one aspect of the present disclosure includes: a control unit for generating a channel state information report (CSI report) including information of each layer; and a transmitting unit configured to transmit the CSI report. According to an aspect of the present disclosure, power/MCS control of each layer/port can be appropriately implemented.

Description

Terminal, wireless communication method and base station

Technical Field

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

Background

In a universal mobile telecommunications system (Universal Mobile Telecommunications System (UMTS)) network, long term evolution (Long Term Evolution (LTE)) is standardized for the purpose of further high-speed data rates, low latency, and the like (non-patent document 1). Further, for the purpose of further large capacity, high altitude, and the like of LTE (third generation partnership project (Third Generation Partnership Project (3 GPP)) Release (rel.)) versions 8 and 9, LTE-Advanced (3 GPP rel.10-14) has been standardized.

Subsequent systems of LTE (e.g., also referred to as fifth generation mobile communication system (5 th generation mobile communication system (5G)), 5g+ (plus), sixth generation mobile communication system (6 th generation mobile communication system (6G)), new Radio (NR)), 3gpp rel.15 later, and the like are also being studied.

Prior art literature

Non-patent literature

Non-patent document 1:3GPP TS 36.300V8.12.0"Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); overall description; stage 2 (Release 8) ", 4 th year 2010

Disclosure of Invention

Problems to be solved by the invention

In rel.15/16NR, transmission and reception of channels and signals using a plurality of antenna ports are controlled so that equal power is applied between the antenna ports, and equal power and the same modulation and coding scheme (Modulation and coding scheme (MCS)) are applied between layers.

However, in a wireless communication system (6G, etc.) in the future, it is demanded to realize higher-speed communication in a multiple-input multiple-output (Multi Input Multi Output (MIMO)) environment. However, research has not been advanced on how to achieve high-speed communication. If this is not clear, there is a concern that an increase in communication throughput is suppressed.

It is therefore an object of the present disclosure to provide a terminal, a wireless communication method, and a base station capable of appropriately implementing power/MCS control per layer/port.

Means for solving the problems

The terminal according to one aspect of the present disclosure includes: a control unit for generating a channel state information report (CSI report) including information of each layer; and a transmitting unit configured to transmit the CSI report.

Effects of the invention

According to an aspect of the present disclosure, power/MCS control of each layer/port can be appropriately implemented.

Drawings

Fig. 1A and 1B are diagrams showing an example of TPMI notification for a UE performing transmission for a 2-antenna port for which transform precoding is invalid and a maximum rank=2 is set.

Fig. 2 is a diagram showing an example of correspondence between TPMI indexes and precoding matrix W.

Fig. 3 shows a conceptual diagram of the first embodiment.

Fig. 4A and 4B are diagrams showing an example of TPMI notification for a UE performing transmission for a 2 antenna port for which transform precoding is invalid and maximum rank=2 is set in embodiment 1.1.1.

Fig. 5 is a diagram showing an example of correspondence between TPMI index and precoding matrix W in embodiment 1.1.2.

Fig. 6A and 6B are diagrams showing an example of the correspondence relationship between a certain index and the power distribution matrix R in embodiment 1.1.3.

Fig. 7 is a diagram showing an example of RRC information elements and parameters for setting a power ratio according to embodiment 1.2.

Fig. 8 is a diagram showing an example of application of the power ratio to non-codebook based transmission in the first embodiment.

Fig. 9 shows a conceptual diagram of the second embodiment.

Fig. 10A and 10B are diagrams showing an example of determination of MCS per layer based on the MCS field in embodiment 2.1.

Fig. 11A and 11B are diagrams showing an example of determination of MCSs of a plurality of layers according to embodiment 2.1.

Fig. 12 is a diagram showing an example of an MCS table in which MCSs of a plurality of layers correspond to one value of an MCS index.

Fig. 13 is a diagram showing an example of RRC information elements and parameters for setting MCS per layer according to embodiment 2.2.

Fig. 14 is a diagram showing an example of determination of the power ratio and MCS per layer based on a specific field in the modification of the first embodiment and the second embodiment.

Fig. 15 is a diagram showing an example of power control per PUSCH for MTRP PUSCH according to another modification of the first embodiment.

Fig. 16 is a diagram showing an example of MCS control per PUSCH for MTRP PUSCH according to another modification of the second embodiment.

Fig. 17 shows a conceptual diagram of the third embodiment.

Fig. 18A and 18B are diagrams showing an example of CSI reporting including CQI for each layer in the fourth embodiment.

Fig. 19A and 19B are diagrams showing an example of determination of MCSs of a plurality of layers according to embodiment 2.1.

Fig. 20 is a diagram showing an example of MCS control for each PDSCH for MTRP PDSCH according to another modification of the third embodiment.

Fig. 21 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 22 is a diagram showing an example of a configuration of a base station according to an embodiment.

Fig. 23 is a diagram showing an example of a configuration of a user terminal according to an embodiment.

Fig. 24 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment.

Detailed Description

(PUSCH precoder)

In NR, a User terminal (User terminal), a User Equipment (UE)) may support at least one of Codebook (CB) -based transmission and Non-Codebook (NCB) -based transmission.

For example, the UE may determine a precoder (precoding matrix) for transmitting an uplink shared channel (physical uplink shared channel (Physical Uplink Shared Channel (PUSCH)) based on at least one of CB and NCB using at least a measurement reference signal (sounding reference signal (Sounding Reference Signal (SRS))) resource index (SRS Resource Index (SRI)).

The UE may also receive information (SRS setting information, e.g., parameters in "SRS-Config" of the RRC control element) used for transmission of the measurement reference signal (e.g., sounding reference signal (Sounding Reference Signal (SRS)).

Specifically, the UE may also receive at least one of information related to one or more SRS Resource sets (SRS Resource set information, e.g., "SRS-Resource" of the RRC control element) and information related to one or more SRS resources (SRS Resource information, e.g., "SRS-Resource" of the RRC control element).

One SRS resource set may also be associated with (or may group) a specific number of SRS resources. Each SRS resource may also be determined by an SRS resource Identifier (SRS resource indicator (SRS Resource Indicator (SRI)) or an SRS resource ID (Identifier).

The SRS resource set information may include information of an SRS resource set ID (SRS-resource ID), a list of SRS resource IDs (SRS-resource IDs) used in the resource set, an SRS resource type, and an SRS use (use).

The "SRS-SetUse" of the use (RRC parameter "user", L1 (Layer-1)) parameter may be, for example, beam management (beam management), codebook (CB), non-codebook (noncodebook (NCB)), antenna switching, or the like. The SRS for codebook or non-codebook use may also be used in the decision of a precoder for the SRI-based codebook or non-codebook-based uplink shared channel (physical uplink shared channel (Physical Uplink Shared Channel (PUSCH))) transmission.

In the case of CB based transmission, the UE may determine a precoder for PUSCH transmission based on SRI, transmission rank indicator (Transmitted Rank Indicator (TRI)), transmission precoding matrix indicator (Transmitted Precoding Matrix Indicator (TPMI)), and the like. In the case of NCB-based transmission, the UE may also decide a precoder for PUSCH transmission based on SRI.

SRI, TRI, TPMI, etc. may also be notified to the UE using downlink control information (Downlink Control Information (DCI)). The SRI may be specified by either an SRS resource indicator field (SRS Resource Indicator field (SRI field)) of the DCI or a parameter "SRS-resource indicator" included in an RRC information element "configurator grantconfig" of a configuration grant (setting grant) PUSCH (configured grant PUSCH).

TRI and TPMI may also be specified by the precoding information of DCI and a layer number field ("Precoding information and number of layers" field). For simplicity, the "precoding information and layer number field" will hereinafter be also simply referred to as "precoding field".

In addition, the maximum number of layers (maximum rank) of UL transmission may also be set to the UE by the RRC parameter "maxRank".

The UE may also report UE capability information (UE capability information) related to the precoder type and set the precoder type based on the UE capability information through higher layer signaling from the base station. The UE capability information may also be information of a precoder type used by the UE in PUSCH transmission (also referred to as RRC parameter "PUSCH-transmission").

In the present disclosure, the higher layer signaling may be, for example, any one of radio resource control (Radio Resource Control (RRC)) signaling, medium access control (Medium Access Control (MAC)) signaling, broadcast information, or the like, or a combination thereof.

MAC signaling may also use, for example, MAC control elements (MAC Control Element (MAC CE)), MAC protocol data units (MAC Protocol Data Unit (PDU)), and the like. The broadcast information may be, for example, a master information block (Master Information Block (MIB)), a system information block (System Information Block (SIB)), or the like.

The UE may determine the precoder to be used for PUSCH transmission based on information (also referred to as RRC parameter "codebook subset") of the precoder type included in PUSCH setting information (PUSCH-Config information element of RRC signaling) notified by higher layer signaling. The UE may also be set with a subset of the codebook specified by TPMI through a codebook subset.

The precoder type may be indicated by any one of complete coherence (full coherence), complete coherence (coherence), partial coherence (partial coherence) and incoherent (non-coherence) or a combination of at least two of them (for example, parameters such as "complete and partial and incoherent (full partial coherence)", "partial and incoherent (partial coherence)") may be used.

Complete coherence may also mean that synchronization of all antenna ports used in transmission has been achieved (which may also be expressed as being able to make the phases uniform, the precoder applied the same, etc.). Partial coherence may also mean that although synchronization has been achieved between ports of a portion of the antenna ports used in transmission, the port of the portion is not synchronized with other ports. Incoherence may also mean that synchronization of the antenna ports used in the transmission is not achieved.

In addition, it is also conceivable that UEs supporting completely coherent precoder types support partially coherent as well as incoherent precoder types. It is also conceivable to support non-coherent precoder types for UEs supporting partially coherent precoder types.

The precoder type may also be replaced with coherence (coherence), PUSCH transmission coherence, coherence (coherence) type, codebook subset type, etc.

The UE may determine a precoding matrix corresponding to a TPMI index obtained from DCI (e.g., DCI format 0_1. Hereinafter, the same) transmitted from the scheduled UL based on a plurality of precoders (may also be referred to as a precoding matrix, codebook, etc.) used for CB based transmission.

Specifically, in rel.15/16NR, when non-codebook based transmission is used for PUSCH, UE may be set to use a set of SRS resources having a maximum of four SRS resources as a non-codebook SRS resource by RRC, and may be instructed to one or more SRS resources of the maximum of four SRS resources by DCI (2-bit SRI field).

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

When CSI-RS (which may also be referred to as associated CSI-RS) associated with the SRS resource (or the SRS resource set to which the SRS resource belongs) are set by a higher layer, a PUSCH transmission beam may be calculated based on (measurements of) the set associated CSI-RS. If not, the PUSCH transmission beam may be specified by the SRI.

In addition, the UE may also be set to use a PUSCH transmission based on a codebook or a PUSCH transmission based on a non-codebook by a higher layer parameter "txConfig" indicating a transmission scheme (scheme). The parameter may also represent a value of "codebook" or "non-codebook".

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

In addition, the transform precoding (transform precoding) being effective may also mean that discrete fourier transform spread OFDM (Discrete Fourier Transform spread OFDM (DFT-s-OFDM)) is used, and the transform precoding being ineffective may also mean that CP-OFDM is used.

In this example, a relation (table) between a precoding field of DCI in rel.15nr (indicated as "bit field mapped to index" in the figure and the same in the similar figures later) and TPMI (TPMI index) is shown, in addition, "codebook subset= fullyAndPartialA ndNonCoherent" described in fig. 1A indicates a table referred to by a completely coherent UE, and "codebook subset=non-coherent" described in fig. 1B indicates a table referred to by a non-coherent UE.

The UE decides the number of layers to be applied in transmission and TPMI for the precoding matrix based on the value of the precoding field included in the DCI and the table of fig. 1A/1B. For example, the fully coherent UE assigned precoding field=2 decides to use layer number=2 and tpmi=0 in PUSCH transmission based on fig. 1A. In addition, "reserved" corresponds to a value defined in the predetermined future.

Fig. 2 is a diagram showing an example of correspondence between TPMI indexes and precoding matrix W. Fig. 2 shows a precoding matrix W for 2-layer transmission using 2-antenna ports that are transform precoded to be invalid.

A UE following fig. 1A decides to use the layer number=2 and tpmi=0 in PUSCH transmission and applies W corresponding to tpmi=0 of fig. 2 in PUSCH transmission.

The UE may calculate a block Z of a vector of complex symbols for each antenna port mapped to a resource (e.g., resource element) based on W and a block Y of a vector of complex symbols for each layer after transform precoding (or layer mapping). For example, z=wy may be obtained.

In the conventional specification of rel.15/16NR, W is specified by TPMI indicated by a precoding field as described above in regard to codebook-based transmission, and W is specified as an identity matrix in regard to non-codebook-based transmission.

For W of fig. 2, layer 1 (column vector of first column) and layer 2 (column vector of second column) are respectively the same power. For example, for tpmi=0, the sum of squares of the components of the column vector of layer 1 and the sum of squares of the components of the column vector of layer 2 are respectivelyThe power ratio between layer 1 and layer 2 was 1:1.

As described above, in the conventional rel.15/16NR, transmission of channels and signals using a plurality of antenna ports is controlled so that equal power is applied between the antenna ports, and equal power and the same modulation and coding scheme (Modulation and coding scheme (MCS)) are applied between layers.

The same control is applied not only to uplink transmission (e.g., PUSCH) but also to downlink transmission (e.g., physical downlink shared channel (Physical Downlink Shared Channel (PDSCH))).

Accordingly, the inventors of the present invention have conceived a method for appropriately performing power/MCS control of each layer/port. Thus, optimal power allocation for each transmission path (layer) based on the water injection theorem or the like can be performed, and an increase in the capacity of the communication path can be expected.

Embodiments according to the present disclosure will be described in detail below with reference to the accompanying drawings. The radio communication methods according to the embodiments may be applied individually or in combination.

In addition, in the present disclosure, "a/B" may also mean "at least one of a and B".

MAC signaling may also use, for example, MAC control elements (MAC Control Element (MAC CE)), MAC protocol data units (MAC Protocol Data Unit (PDU)), and the like. The broadcast information may be, for example, a master information block (Master Information Block (MIB)), a system information block (System Information Block (SIB)), minimum system information (remaining minimum system information (Remaining Minimum System Information (RMSI))), other system information (Other System Information (OSI)), or the like.

The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI))).

In the present disclosure, activation, deactivation, indication, selection, setting, update, decision, and the like may be replaced with each other.

In the present disclosure, a panel, a beam, a panel group, a beam group, an Uplink (UL)) transmitting entity, TRP, spatial Relationship Information (SRI), spatial relationship, a control resource set (COntrol REsource SET (CORESET)), a physical downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a codeword, a base station, a specific antenna port (e.g., demodulation reference signal (DeModulation Reference Signal (DMRS)) port), a specific antenna port group (e.g., DMRS port group), a specific group (e.g., code division multiplexing (Code Division Multiplexing (CDM)) group, a specific reference signal group, 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 transmission setting indication state (Transmission Configuration Indication state (TCI state)) (DL TCI state), an Uplink TCI state (UL TCI state), a unified TCI state (unified TCI state), QCL, and the like may also be replaced with each other.

Furthermore, the spatial relationship information identifier (Identifier (ID)) (TCI state ID) and the spatial relationship information (TCI state) may be replaced with each other. "spatial relationship information" may also be interchangeable with "a set of spatial relationship information", "one or more spatial relationship information", etc. The TCI state and TCI may also be interchanged.

In this disclosure, the index, ID, indicator, resource ID may also be replaced with each other. Further, in the present disclosure, sequences, lists, sets, groups, clusters, subsets, etc. may also be replaced with each other.

In the following description of the embodiments, "spatial relationship information (Spatial Relation Information (SRI))", "spatial relationship information for PUSCH", "spatial relationship", "UL beam", "transmission beam of UE", "UL TCI state", "spatial relationship of UL TCI state", SRS resource indicator (SRS Resource Indicator (SRI)), SRS resource, precoder, and the like may also be replaced with each other.

In the present disclosure, layers, ports (antenna ports), SRS ports, DMRS ports, and the like may also be replaced with each other. For example, the power ratio between the layers may be replaced with the power ratio between the ports.

The layer may be replaced with one or more groups of layers (layer groups), one or more groups of ports (port groups), or the like. For example, it may be treated that layer 1 and layer 2 belong to layer group 1 and layer 3 belongs to layer group 2.

In addition, "layer i" (i is an integer) of the present disclosure may be replaced with layer i-1, layer i+1, or other layer numbers (i.e., may be replaced with any layer number).

The "PUSCH" of the following embodiments may also be replaced with other UL channel/UL signals (e.g., PUCCH, DMRS, SRS).

The "PDSCH" of the following embodiments may also be replaced with other DL channels/DL signals (e.g., PDCCH, DMRS, CSI-RS).

The "power" in the following embodiments may be replaced with transmission power, and may mean PUSCH transmission power, PDSCH transmission power, or the like. Further, in the present disclosure, the power may also be replaced with at least one of an absolute value of a precoding vector/matrix, a sum of squares of all elements of a specific column (or row) of the vector/matrix, a sum of squares of all elements of the vector/matrix, and the like.

(Wireless communication method)

< first embodiment >, first embodiment

The first embodiment relates to power control of PUSCH per layer.

In the first embodiment, the UE may transmit PUSCH using different power per layer.

Fig. 3 shows a conceptual diagram of the first embodiment. As described above, the UE equally allocates power between layers in rel.15/16NR, but in the first embodiment, as shown in the figure, it is possible to transmit layer 1 with a large transmission power and layer 2 with a small transmission power.

The UE may determine to perform (or be able to perform) the determination of PUSCH power per layer when at least one of the following conditions is satisfied:

condition 1-1: the UE reports power control that may be (or support) PUSCH per layer;

condition 1-2: the UE is set with certain high-level parameters;

conditions 1-3: the UE receives a specific MAC CE;

conditions 1-4: the number of layers of the PUSCH is a certain value/is included in a certain range;

conditions 1-5: the MCS for each layer is indicated for the PUSCH.

The report of condition 1-1 may also be a report indicating UE capability information supporting power control of PUSCH per layer.

The higher layer parameters of conditions 1-2 may also be parameters indicating that the power control of PUSCH of each layer is activated. The parameter may be a parameter included in PUSCH setting information (e.g., PUSCH-config information element). The parameter may also be, for example, a parameter for full power transmit power (e.g., ul-fullpower transmission).

The MAC CEs of conditions 1-3 may also be MAC CEs indicating activation/deactivation of power control of PUSCH of each layer. The UE may perform power control of PUSCH per layer when the power control of PUSCH per layer is activated, and may not perform power control of PUSCH per layer when the power control of PUSCH per layer is deactivated (in this case, power control of PUSCH common to layers as specified in rel.15/16NR may be performed).

The "certain value" of the conditions 1 to 4 may be, for example, 1, 2, 4, 8, or the like. The term "included in a certain range" of the conditions 1 to 4 may also mean "above/above the threshold", "below/below the threshold", and the like.

The "certain value", "certain range" (e.g., the threshold described above) of conditions 1-4, etc., may be predetermined by specification, may be specified based on higher layer signaling (e.g., RRC parameters, MAC CEs), physical layer signaling (e.g., DCI), or a combination thereof, and may be determined based on UE capabilities.

It is also conceivable that conditions 1 to 5 are satisfied, for example, when a plurality of MCS fields each indicating an MCS of a different layer are included in DCI for scheduling PUSCH and when one MCS field indicating a plurality of MCSs for each of the plurality of layers is included.

The first embodiment is roughly divided into the following two according to how the UE decides PUSCH transmission power for each layer:

embodiment 1.1: the UE decides based on DCI;

embodiment 1.2: the UE decides based on RRC parameters.

In addition, embodiment 1.1 and embodiment 1.2 can be applied also when at least one of the above-described conditions 1-1 to 1-5 is satisfied. For example, the table of fig. 4A/4B in embodiment 1.1.1 described later may be referred to by the UE only when at least one of the above-described conditions 1-1 to 1-5 is satisfied. For example, it is also conceivable that the power ratio field in embodiment 1.1.3 described below is included in DCI only when at least one of the above conditions 1-1 to 1-5 is satisfied.

In the present disclosure, the following embodiments show examples in which the power per layer is determined based on the power ratio between layers, but the power ratio may be replaced with the transmission power value of each layer. In this case, one of the transmission power values of the respective layers may be provided to the UE, and the transmission power value of the other layer may be determined based on the one of the transmission power values.

The power ratio between layers may be provided either in a manner of power ratio= (1, 1) (this may also mean power of layer 1 (power coefficient): power of layer 2 = 1:1. The same applies hereinafter), or by a diagonal matrix in which diagonal components (diagonal elements) are values of the power ratio of each layer (for example, diagonal components of i rows and i columns represent power of layer 1 (power coefficient)). Hereinafter, this diagonal matrix is also referred to as a power distribution matrix R (a matrix expressing the power of each layer).

The power distribution matrix R may be derived from the power ratio between layers supplied as the power ratio= (1, 1), or conversely, the power ratio between layers may be derived from R. In the following embodiments, the power ratio and the power distribution matrix R may be replaced with each other.

Embodiment 1.1

The UE may also decide the power of each layer based on a field included in the DCI.

For example, the UE may determine the power ratio between layers or the transmission power value of each layer based on any one of or a combination of precoding information and a layer number field ("precoding information and layer number" field ("Precoding information and number of layers" field)) (hereinafter, also referred to as a precoding field for simplicity), an SRI field, and the like.

Embodiment 1.1 is further broadly divided into embodiments 1.1.1 to 1.1.3.

[ [ embodiment 1.1.1] ]

In embodiment 1.1.1, the UE determines TPMI and the power ratio based on the value of the precoding field. That is, in embodiment 1.1.1, at least one code point of the precoding field is associated with a power ratio.

In embodiment 1.1.1, the UE may calculate the Z based on the precoding matrix W corresponding to TPMI, the Y, and the power allocation matrix R. For example, z=wry may be obtained.

Fig. 4A and 4B are diagrams showing an example of TPMI notification for a UE performing transmission for a 2 antenna port for which transform precoding is invalid and maximum rank=2 is set in embodiment 1.1.1. In this example, the same points as those in fig. 1A and 1B will not be described repeatedly.

In this example, when the number of layers associated with a code point (value) of the precoding field is 2 or more, the number of layers and TPMI are also associated with the code point, and the inter-layer power ratio is also associated with the number of layers and TPMI. In fig. 4A, for example, the code point=2 represents the power ratio= (1, 1),

Different TPMI for the same number of layers (code points=2 and 7 of fig. 4A) may also be able to specify the same/different power ratio, and the same TPMI for the same number of layers (code points=7 and 8 of fig. 4A) may also be able to specify the same/different power ratio.

In embodiment 1.1.1, the number of bits in the precoding field may also vary depending on whether or not power control is performed for each layer. In other words, the UE may assume that the number of bits of the precoding field in the case of performing power control per layer is different from or equal to the number of bits of the precoding field in the case of not performing power control per layer.

In addition, the power ratios associated with the code points may be determined in advance by specification, or may be specified/decided by higher layer signaling, physical layer signaling, UE capabilities, or a combination thereof.

[ [ embodiment 1.1.2] ]

In embodiment 1.1.2, the UE determines TPMI from the value of the precoding field, as in the conventional standard. However, W corresponding to TPMI differs from the conventional standard in that W is included so that the power ratio per layer is different.

In embodiment 1.1.2, the UE may calculate the Z based on the precoding matrix W (considering the power ratio between layers) corresponding to TPMI and the Y. For example, z=wy may be obtained.

Fig. 5 is a diagram showing an example of correspondence between TPMI index and precoding matrix W in embodiment 1.1.2. Fig. 5 shows, as in fig. 2, a precoding matrix W for 2-layer transmission using 2-antenna ports for which transform precoding is not effective, but corresponds to assuming that W having the same interlayer power ratio in fig. 2 is W _TPMI W=w by the power distribution matrix R _TPMI R.

In addition, in the present disclosure, WR or W is shown _TPMI The sum of squares of all the components of R is an example of R as 1 or less (or less than 1), but R as the sum of squares exceeds 1 may be allowed.

As shown in FIG. 5, it is possible to use a method for different W _TPMI Multiplying W by the same/different R may also be able to utilize W for the same _TPMI Multiplying W by different R.

In the other drawings, the index (not shown) may be simply omitted (W may be allocated) or Reserved (Reserved).

In embodiment 1.1.2, the number of bits in the precoding field may also vary depending on whether or not power control is performed for each layer. In other words, the UE may assume that the number of bits of the precoding field in the case of performing power control per layer is different from or equal to the number of bits of the precoding field in the case of not performing power control per layer.

In addition, W corresponding to the TPMI index may be determined in advance by specification, or may be specified/decided by higher layer signaling, physical layer signaling, UE capability, or a combination thereof.

[ [ embodiment 1.1.3] ]

In embodiment 1.1.3, the UE determines the power ratio based on the value of a specific field of the DCI or the value of a specific index indicated by the value of the specific field.

In embodiment 1.1.3, the UE may calculate the Z based on the precoding matrix W corresponding to TPMI, the Y, and the power allocation matrix R. For example, z=wry may be obtained.

The specific field in embodiment 1.1.3 may be at least one of a precoding field, an SRI field, a time/frequency resource allocation field, and the like, and the specific index may be at least one of a TPMI index, an SRI index (SRI), and the like.

Fig. 6A and 6B are diagrams showing an example of the correspondence relationship between a certain index and the power distribution matrix R in embodiment 1.1.3. In fig. 6A, R is associated with a TPMI index derived based on the precoding field. In fig. 6B, R is associated with the value of the SRI field. In addition, R may also be determined based on one or more SRIs corresponding to the value of the SRI field.

The specific field in embodiment 1.1.3 may be a new field (for example, referred to as a power ratio field) indicating the power ratio (or R) between layers, which is not specified in the existing NR.

In embodiment 1.1.3, the number of bits of the power ratio field may be determined based on at least one of the number of layers, a higher layer parameter, and the like.

In addition, the power ratios associated with the code points of the power ratio field may be determined in advance by specifications, or may be specified/decided by higher layer signaling, physical layer signaling, UE capabilities, or a combination thereof.

Embodiment 1.2

The UE may also decide the power of each layer based on RRC parameters.

In embodiment 1.2, as in the above embodiment, z=wry or z=wy=w may be based on _TPMI RY was used to calculate Z. The R (or WR or W) _TPMI R) may also be determined based on RRC parameters.

Fig. 7 is a diagram showing an example of RRC information elements and parameters for setting a power ratio according to embodiment 1.2. This example is described using an abstract syntax notation 1 (Abstract Syntax Notation One (asn.1)) notation (further, since this is merely an example, there is a possibility that it is not a complete description). Of course, the meaning of the RRC information element/parameter in this figure is understood by those skilled in the art as the same name as the RRC information element/parameter already specified in the specification of rel.15/16NR (TS 38.331).

In the present disclosure, names such as RRC information element and RRC parameter are not limited to this, and for example, suffixes (for example, "_r18", "-r18", etc.) indicating the meaning of being introduced through specific resources may be added. The suffix may not be added, and other words may be added.

In this example, the RRC information element "configurable grantconfigug" of configuration grant PUSCH (configured grant PUSCH) is shown.

For example, enablepowerdistibutedperfyer may also be a parameter that activates (can be done as enabling) the power control of each layer.

The UE may also decide to configure the power ratio of the grant PUSCH using a value provided by RRC setting of the precoding and reporting symbols within the UL grant instead of the precoding field of the DCI. In embodiment modes 1.1.1, 1.1.2, and the like, the above-described contents can be applied instead.

The UE may determine the power ratio of the configuration grant PUSCH by using a value provided by RRC setting powerdistribution perlayer in UL grant instead of the power ratio field of DCI. In embodiment mode 1.1.3, the above-described contents can be applied instead. The powerdistribution layer may represent an index (an integer of 0 to 15 in the figure) associated with the power ratio, or may represent an arrangement/resource/sequence including one or more values (for example, values of the power ratios of layer 1 and layer 2) associated with the power ratio.

The setting of the RRC parameter related to the power ratio as shown in fig. 7 is not limited to the configurable grant configuration, and may be set in PUSCH setting information (PUSCH-configuration information element), for example. In this case, each of the parameters may be determined to be a parameter used for PUSCH control, and the UE may determine a dynamic PUSCH power ratio to be scheduled by DCI based on an RRC parameter related to the power ratio included in PUSCH setting information, for example.

Modification of the first embodiment

The power ratio determination methods of embodiments 1.1 and 1.2 described above may be applied to codebook-based transmission or non-codebook-based transmission.

In the non-codebook based transmission, W may be calculated by z=wry based on the determined power ratio (power allocation matrix R) while leaving the existing identity matrix unchanged. In the non-codebook based transmission, W may be set as the power distribution matrix R, and calculated by z=ry. For non-codebook based transmission, W in the above embodiment may be replaced with an existing identity matrix or R.

Fig. 8 is a diagram showing an example of application of the power ratio to non-codebook based transmission in the first embodiment. In this example, the UE to which the non-codebook based transmission is set is assumed to indicate two SRI indexes (SRI 1, SRI 2) by the SRI field of the DCI.

The UE may also follow embodiment 1.1.3 to further decide a power ratio based on the value of the SRI field (e.g.,) And applies respective power ratios for the two SRIs represented by the two SRI indices.

The UE may also assume that the above-described arbitrary power ratio determination method according to embodiment 1.1 or embodiment 1.2 can be applied to codebook-based transmission.

The UE may also assume that a method for determining a power ratio not based on a precoding field (or TPMI) can be applied for non-codebook-based transmission (e.g., a method for determining a powerdistribution perlayer based on embodiment 1.1.3 or embodiment 1.2).

According to the first embodiment described above, power control per layer can be appropriately performed.

< second embodiment >

The second embodiment relates to MCS control of PUSCH per layer.

In the second embodiment, the UE may transmit PUSCH by applying different MCS for each layer. In addition, when different MCSs are applied for each layer, the UE may calculate the size (Transport Block Size (TBS)) of a transport block transmitted on the PUSCH using these different MCSs. For example, the UE may calculate the TBS for each layer using the MCS for each layer. In this case, the total TBS transmitted using a plurality of layers may be obtained by summing the TBSs of each layer. This will be described later.

Fig. 9 shows a conceptual diagram of the second embodiment. As described above, the UE applies the same MCS between layers in rel.15/16NR, but in the second embodiment, as illustrated, can transmit using an MCS (for example, MCS index=0) having a small coding rate (code rate) for layer 1 and can transmit using an MCS (for example, MCS index=5) having a large coding rate for layer 2.

The UE may determine to perform (enable) a determination of the MCS of the PUSCH per layer when at least one of the following conditions is satisfied:

condition 2-1: the UE reports control of the MCS that can be (or support) per layer;

condition 2-2: the UE is set with certain high-level parameters;

condition 2-3: the UE receives a specific MAC CE;

condition 2-4: the number of layers of the PUSCH is a certain value/is included in a certain range;

condition 2-5: for this PUSCH, different power (different power ratio is specified/set) is applied per layer.

The report of condition 2-1 may also be a report indicating UE capability information supporting MCS control of PUSCH per layer.

The higher layer parameter of condition 2-2 may also be a parameter indicating that MCS control of PUSCH of each layer is activated. The parameter may be a parameter included in PUSCH setting information (e.g., PUSCH-config information element). The parameter may also be, for example, a parameter for full power transmit power (e.g., ul-fullpower transmission).

The MAC CE of condition 2-3 may also be a MAC CE indicating activation/deactivation of MCS control of PUSCH of each layer. The UE may perform MCS control of PUSCH per layer when the MCS control of PUSCH per layer is activated, and may not perform MCS control of PUSCH per layer when the MCS control of PUSCH per layer is deactivated (in this case, MCS control of PUSCH common to layers as defined in rel.15/16NR may be performed).

The "certain value" of the condition 2 to 4 may be, for example, 1, 2, 4, 8, or the like. The term "included in a certain range" of the conditions 2 to 4 may also mean "above/above the threshold", "below/below the threshold", and the like.

The "certain value", "certain range" (e.g., the threshold described above) of conditions 2-4, etc., may be predetermined by specification, may be specified based on higher layer signaling (e.g., RRC parameters, MAC CEs), physical layer signaling (e.g., DCI), or a combination thereof, and may be determined based on UE capabilities.

It is also conceivable that the conditions 2 to 5 are satisfied, for example, in the case where the power ratio shown in the first embodiment is specified/set.

The second embodiment is roughly divided into the following two according to how the UE decides the MCS of PUSCH per layer:

Embodiment 2.1: the UE decides based on DCI;

embodiment 2.2: the UE decides based on RRC parameters.

In addition, embodiment 2.1 and embodiment 2.2 can be applied when at least one of the above-described conditions 2-1 to 2-5 is satisfied. For example, the MCS table in embodiment 2.1 described later may be referred to by the UE only when at least one of the above-described conditions 2-1 to 2-5 is satisfied. For example, it is also conceivable that the second MCS field or MCS offset field in embodiment 2.1 described below is included in DCI only when at least one of the above conditions 2-1 to 2-5 is satisfied.

Embodiment 2.1

The UE may also decide the MCS of each layer based on a field included in the DCI.

For example, the UE may determine the MCS of each of the plurality of layers based on one MCS field. The MCS field may be represented by the same number of bits (5 bits) as the existing MCS field or by a different (e.g., more) number of bits. In addition, in the case where the MCS indexes of the plurality of layers are determined by one MCS field, the MCS field may also be referred to as an MCS set field or the like.

The UE may also determine MCS indexes of other layers based on the MCS index of one layer indicated through the one MCS field.

In addition, the UE may determine the MCS of one layer for one MCS field based on a plurality of MCS fields. The MCS field may be represented by the same number of bits (5 bits) as the existing MCS field or by a different (e.g., fewer) number of bits.

In embodiment 2.1, the number of bits in each MCS field may vary depending on whether or not at least one of MCS control, the number of transmission layers, and the like is performed for each layer. For example, the UE may assume that the number of bits of the MCS field in the case of performing MCS control for each layer is different from the number of bits of the MCS field in the case of not performing MCS control for each layer, or may assume that the number of bits of the MCS field is the same.

Fig. 10A shows an example in which a plurality of MCS fields included in DCI indicate MCSs of different layers, respectively. In this example, the first MCS field represents an MCS index (=3) for layer 1 and the second MCS field represents an MCS index (=4) for layer 2.

Fig. 10B illustrates an example in which one MCS field included in DCI indicates an MCS of one layer. In this example, one MCS field indicates an MCS index (=3) for layer 1. The UE may also determine the MCS index for layer 2 such that the MCS index for layer 1 is +1 (=4).

When determining the MCS index of another layer based on the MCS index of one layer indicated by one MCS field, the MCS index of another layer may be obtained by the MCS index=the MCS index of one layer+the MCS offset (in fig. 10B, MCS offset=1). The MCS offset may be replaced with an MCS index offset, a differential MCS index, or the like. The MCS offset may be an integer or a negative value.

The above one MCS field may also represent an MCS index of a layer of a smallest index (e.g., layer 1) or a layer of a largest index (e.g., layer of a largest rank).

The MCS offset may be determined either in advance by specification or specified/decided by higher layer signaling, physical layer signaling, UE capability or a combination thereof. The MCS offset may also be specified by an MCS offset field contained in the same DCI as the MCS field. The number of bits of the MCS offset field may also be determined based on at least one of the number of layers, higher layer parameters, etc.

FIG. 11A and fig. 11B are diagrams showing an example of determination of MCSs of a plurality of layers according to embodiment 2.1. FIG. 11A shows the MCS field (MCS index I) also utilized in the existing Rel.15/16NR _MCS ) Correspondence to MCS parameters (Modulation order) Qm, target coding rate R, spectral efficiency).

The table indicating such correspondence relationship may be also referred to as an MCS table, an MCS index table, or the like. The modulation order is a value corresponding to the modulation scheme. For example, the modulation orders of QPSK (quadrature phase shift keying (Quadrature Phase Shift Keying)), 16QAM (quadrature amplitude modulation (Quadrature Amplitude Modulation)), 64QAM, 256QAM may be 2, 4, 6, 8, respectively.

Consider the case where the UE is assigned a layer 1 MCS index=7 through one MCS field of the DCI. The UE may also be assigned a layer 2 MCS index through an MCS offset field included in the DCI. Fig. 11B shows an example of the correspondence between the MCS offset field and the MCS parameter for layer 2 in this case. The MCS parameter of fig. 11B corresponds to the MCS parameter corresponding to the MCS index=4-7 of fig. 11A. That is, in this example, the values=0, 1, 2, 3 of the MCS offset field correspond to MCS offsets= -3, -2, -1, 0, respectively.

The correspondence of the value of the MCS offset field to the MCS offset (or MCS parameter) may also be specified/decided by higher layer signaling, physical layer signaling, UE capability, or a combination thereof.

The specification of the MCS of the plurality of layers using the MCS field and the MCS offset field is expected to notify the MCS with a smaller number of bits (low overhead) than the specification of the MCS of the plurality of layers using the two MCS fields.

[ [ MCS table ] ]

In fig. 11A, the MCS table in which the MCS of one layer corresponds to one value of the MCS index is shown, but the MCS table in which the MCSs of a plurality of layers correspond to one value of the MCS index may be used. In this case, the UE may determine MCSs of a plurality of layers from one MCS field, without depending on the MCS offset.

Fig. 12 is a diagram showing an example of an MCS table in which MCSs of a plurality of layers correspond to one value of an MCS index. In this example, the MCS parameters of layer 0 and layer 1 are associated with an MCS index.

Instead of referring to one MCS table indicating MCSs of a plurality of layers as shown in fig. 12, a plurality of MCS tables each indicating an MCS of a different layer may be referred to. For example, when the UE is scheduled to transmit in layer 2, the UE may determine the MCS in layer 0 based on the MCS field and the first table (MCS table for MCS parameters of layer 0) and determine the MCS in layer 1 based on the same MCS field and the second table (MCS table for MCS parameters of layer 1).

The UE may also decide the referenced MCS table based on the number of layers of the transmitted PUSCH.

In addition, regarding one or both of the case where the MCS of one layer is determined for one MCS field and the case where the MCSs of a plurality of layers are determined for one MCS field, the UE may refer to the same (common) MCS table in each layer to determine the MCS parameter of each layer, or refer to different MCS tables for each layer to determine the MCS parameter of each layer.

The MCS table referred to with respect to a certain layer may be determined in advance by specification or may be specified/decided by higher layer signaling, physical layer signaling, UE capability or a combination thereof. For example, RRC parameters specifying the MCS table to be referred to may be set for each layer.

[[TBS]]

The calculation of the total TBS received using a plurality of layers in the second embodiment will be described.

In the existing Rel.15/16NR standard, the UE calculates the TBS for the PUSCH based on the following steps S101-S103.

In step S101, the UE is based on the number (N 'of REs allocated to PUSCH within 1 physical resource block (Physical Resource Block (PRB))' _RE ) To determine the total number (N) of Resource Elements (REs) allocated to PUSCH within the slot _RE )。

In step S102, the UE decides on intermediate variables (Unquantized intermediate variable) (N _info ). Specifically, N _info Can also pass through N _info ＝N _RE R.qm.v. Wherein R and Qm are each a DCI-based MCS field (MCS indexGuide (I) _MCS ) A target coding rate and a modulation order determined by the MCS table. Further, v is the number of layers of PDSCH.

In step S103, the UE is based on the above N _info To determine TBS. In addition, according to N _info Is (e.g. according to N _info Whether the value of (a) is below the threshold (=3824) is a quantized intermediate variable (N 'derived by different methods' _info ) And based on the N' _info And is determined as TBS.

In addition, for the calculation of the total TBS received using a plurality of layers in the second embodiment, a step of correcting at least one of the above steps S101 to S103 may be used.

For example, in step S102, N _info Can also pass through N _info ＝Σ ^ν _i＝1 (N _RE ·R _i ·Qm _i ) To obtain the product. Wherein R is _i Qm of the invention _i Or the target coding rate and modulation order for layer i, respectively. Sigma and method for producing the same ^ν _i＝1 (N _RE ·R _i ·Qm _i ) N, which may also represent i=1 to i=v _RE ·R _i ·Qm _i Is a sum of (a) and (b). In this case, based on the N _info The TBS determined in step S103 is a result of considering the MCS of each layer.

In addition, for example, N may be used in step S102 _info、i ＝N _RE ·R _i ·Qm _i To find N for layer i _info、i In step S103, the same as in the conventional method, N is used _info、i And the TBS determined as the TBS of layer i _i And total TBS of all layers passes tbs=Σ ^ν _i＝1 TBS _i And is determined. The TBS becomes a result considering the MCS of each layer. In addition, the method may be based on N _info、i And the quantized intermediate variable (N 'for layer i is derived' _info、i ) And based on the N' _info、i When the TBS is determined, the determination is based on the above-mentioned N' _info (and threshold values (=3824) different from the threshold values used for determination of the determination method of TBS)The value of N 'is determined' _info、i (TBS) _i ) Is a method of determining. The threshold value may be a value different for each layer i (threshold value _i ). Each threshold value _i Either determined in advance by specifications or specified/decided by higher layer signaling, physical layer signaling, UE capabilities or a combination thereof.

In addition, in these corrected steps, the total number of REs of PUSCH in a slot allocated to each layer is represented as N _RE、i In the case of (a), N is as described above _RE Can also be replaced by N _RE、i 。

In addition, for example, the UE may determine the modulation order (Qm) for layer 1 based on the MCS index (e.g., provided from the first MCS field) for layer 1 ₁ ) Target coding rate (R ₁ ) And decides the modulation order (Qm) for layer 2 based on the MCS index for layer 2 (e.g., provided from either the second MCS field or the first MCS field and the MCS offset field) ₂ ) Target coding rate (R ₂ )。

Embodiment 2.2

The UE may also decide the MCS of each layer based on the RRC parameters.

Fig. 13 is a diagram showing an example of RRC information elements and parameters for setting MCS per layer according to embodiment 2.2. This example is similar to fig. 7, and the same description as that of fig. 7 will not be repeated.

For example, enablemcspierlayer may also be a parameter that activates (can be done as enabled) MCS control per layer.

Instead of the MCS field of DCI, the UE may determine the MCS of each layer configuring the grant PUSCH by using a value provided by RRC setting of mcsfandtbs in UL grant (RRC-configurable uplink).

The UE may determine the MCS of layer0 and layer1 in which the grant PUSCH is configured, by using values provided by RRC setting of mcsandtbsffort 0 and mcsandtbsffort 1 in UL grant (RRC-configurable uplink grant) instead of the first MCS field and the second MCS field of DCI of embodiment 2.1.

In addition, when at least one of mcsAndTBS, mcsAndTBSForLayer and mcsAndTBSF orLayer1 is set, the UE may derive the TBS for each layer based on the MCS for each layer for the configuration grant PUSCH.

The setting of the RRC parameter related to the MCS for each layer as shown in fig. 13 is not limited to the configurable grant configuration, and may be set in PUSCH setting information (PUSCH-configuration information element), for example. In this case, the UE may determine that each of the parameters is a parameter for PUSCH control, and may determine MCS for each layer for dynamic PUSCH scheduled by DCI based on, for example, RRC parameters related to MCS for each layer included in PUSCH setting information.

Modification of the second embodiment

The MCS to be applied to each of the layers may be any one of a plurality of MCS to be applied to each of the layers (any combination may be used). For example, there may be a limitation that the modulation order applied in the first layer is the same as the modulation order applied in the second layer or that the difference between the orders is equal to or less than a threshold (e.g., 2). Further, there may be a limitation that the target coding rate applied in the first layer is the same as or different from the target coding rate applied in the second layer by a threshold value (e.g., 200) or less.

Such restrictions may be determined either in advance by specifications or specified/decided by higher layer signaling, physical layer signaling, UE capabilities or a combination thereof.

According to the second embodiment described above, MCS control per layer can be appropriately performed.

< another modification of the first and second embodiments >

[ Power per layer and MCS control ]

The power control based on each layer of the first embodiment and the MCS control based on each layer of the second embodiment may also be performed simultaneously. In this case, both the power ratio and MCS per layer may be controlled based on a specific field of the DCI.

The specific field may be a field specified in the existing DCI, such as a precoding field, an SRI field, and an MCS field, or may be a newly specified field.

In this example, the power of each layer (power allocation matrix R) and the MCS index of each layer are associated with the value of a specific field (DCI field). The correspondence of the value of this particular field to R and MCS index (or MCS parameter) may be determined in advance by specification or may be specified/decided by higher layer signaling, physical layer signaling, UE capability, or a combination thereof.

The MCS for each layer may be associated with the value of the DCI field shown in fig. 14, i.e., the value=0 or 1, or may be associated with the value of the DCI field and the value of other fields (e.g., MCS field) shown in the value=2 of the DCI field shown in fig. 14. In the example of DCI field value=2 of fig. 14, the MCS index for layer 1 and the MCS index for layer 2 are determined by adding different values (3 and 2) to the MCS index obtained from the MCS field.

The first value (e.g., 0) of the specific field may indicate that neither power control nor MCS control is performed for each layer. The UE to which the value is assigned may perform power control and MCS control for PUSCH transmission in common to the layers, similarly to rel.15/16 NR.

The second value (e.g., 1) of the specific field may indicate that the MCS control per layer is performed without performing the power control per layer. The third value (e.g., 2) of the specific field may indicate that the MCS control per layer is not performed, but the power control per layer is performed.

[ Power/MCS control per TRP in MTRP PUSCH ]

The power/MCS control of each layer in the first and second embodiments may also be applied in the power/MCS control of each of the plurality of Transmission/Reception points (TRPs) PUSCH (MTRP PUSCH) of Transmission/Reception Point (TRP)) (Multi TRP (MTRP)).

In future wireless systems (e.g., NR of rel.17 and beyond), it is being studied to use a single DCI for PUSCH repetition transmission (MTRP PUSCH repetition) for multiple TRPs to indicate multiple (e.g., two) SRIs/TPMI. Such an operation may also be referred to as a single DCI based multi-TRP operation (single-DCI (s-DCI) based Multi TRP operation).

In the case that a single DCI (sdi) indicates a plurality of SRIs/TPMI, the following option 1 or option 2 is considered:

option 1: using a field indicating a plurality (e.g., two) of SRIs/TPMI, an SRI/TPMI (value) for a plurality (e.g., two) of TRPs is indicated;

option 2: a field indicated to indicate one SRI/TPMI, and code points corresponding to values of a plurality of (e.g., two) SRI/TPMI are set in the field indicating the SRI/TPMI.

In option 1, the respective code points of the plurality of SRI/TPMI fields may also correspond to the value of one TPMI. The correspondence (association) of the SRI/TPMI field and the value of SRI/TPMI may also be defined in the specification in advance. The correspondence (association) between the SRI/TPMI field and the value of SRI/TPMI may be defined up to rel.16 or may be defined after rel.17. The SRI/TPMI field may be different from the corresponding SRI/TPMI value for each of the plurality of SRI/TPMI fields.

In option 2, the code point indicated by one SRI/TPMI field may also correspond to the values of multiple (e.g., two) SRI/TPMI. The correspondence (association) of the SRI/TPMI field and the value of SRI/TPMI may be either predefined in the specification or notified/set/activated by RRC signaling/MAC CE.

In addition, when the sdis designates a plurality of RSs (for example, SRS) (in other words, designates a plurality of SRIs), the UE may apply different transmission power/MCS for each PUSCH transmission corresponding to each designated RS.

For example, when the sdis detected by the UE includes a plurality of SRI fields, the UE transmits a plurality of PUSCHs using SRS ports corresponding to SRS resources specified by the fields. At this time, the UE may transmit the plurality of PUSCHs by applying different power/MCS for each PUSCH.

The control may be achieved by an embodiment in which "layer" is replaced with at least one of "TRP", "RS (for example, SRS)", "PUSCH transmission corresponding to RS", "PUSCH", "group constituted by PUSCH transmission corresponding to one or more RSs (group including PUSCH transmission corresponding to one or more RSs)", and the like in the first and second embodiments described above. For example, the power ratio per layer may be applied to each PUSCH, instead of multiplying the precoding matrix for one PUSCH.

Fig. 15 is a diagram showing an example of power control per PUSCH for MTRP PUSCH according to another modification of the first embodiment. For example, consider a case in which the BS1 notifies the UE of the sdis of the scheduled MTRP PUSCH including the first SRI field indicating SRS1, the second SRI field indicating SRS4, and the information indicating the power ratio per PUSCH.

In this case, as shown in fig. 15, the UE may apply high power to SRS1 (and PUSCH corresponding to SRS 1) (BS 1-oriented) and apply low power to SRS4 (and PUSCH corresponding to SRS 4) (BS 2-oriented) to transmit.

Fig. 16 is a diagram showing an example of MCS control per PUSCH for MTRP PUSCH according to another modification of the second embodiment. For example, consider a case in which the sdis of a scheduled MTRP PUSCH including information indicating the first SRI field of SRS1, the second SRI field of SRS4, and the MCS of each PUSCH is notified from BS1 to UE.

In this case, as shown in fig. 16, the UE may apply a low MCS index to SRS1 (and PUSCH corresponding to SRS 1) (BS 1-oriented) and apply a high MCS index to SRS4 (and PUSCH corresponding to SRS 4) (BS 2-oriented) to transmit.

< third embodiment >

The third embodiment relates to MCS control of PDSCH per layer.

In the third embodiment, the UE may apply a different MCS for each layer (DMRS port) for one codeword to receive the PDSCH. In addition, when different MCSs are applied for each layer, the UE may calculate the size (Transport Block Size (TBS)) of a transport block received by the PDSCH using these different MCSs. For example, the UE may calculate the TBS for each layer using the MCS for each layer. In this case, the total TBS received using a plurality of layers may be obtained by summing the TBSs of each layer.

Fig. 17 shows a conceptual diagram of the third embodiment. As described above, the UE applies the same MCS between layers in rel.15/16NR, but in the third embodiment, as illustrated, the UE can receive an MCS based on a large coding rate (code rate) for layer 1 and can receive an MCS based on a small coding rate for layer 2.

The third embodiment may be implemented as an embodiment in which the second embodiment described above is appropriately replaced. For example, the third embodiment may be equivalent to an embodiment in which "PUSCH" in the second embodiment is replaced with "PDSCH", transmission "of" (PUSCH) is replaced with "(reception of PDSCH), and" layer "is replaced with" (DMRS port of PDSCH). The configuration grant setting and PUSCH setting information may be replaced with PDSCH setting information (PDSCH-Config information element). Further, DCI for scheduling PUSCH (DCI for UL) may be replaced with DCI format 0_0/0_1/0_2 or the like, and DCI for scheduling PDSCH may be replaced with DCI format 1_0/1_1/1_2 or the like.

According to the third embodiment described above, MCS control per layer/DMRS port can be appropriately performed.

< fourth embodiment >, a third embodiment

The fourth embodiment relates to reporting related to parameters of each layer, for example, channel state information (Channel State Information (CSI)) reporting.

In NR, the UE measures channel state using a reference signal (or a resource for the reference signal) and feeds back (reports) CSI to a network (e.g., a base station).

The UE may also measure the channel state using at least one of a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a synchronization signal/broadcast channel (synchronization signal/physical broadcast channel (Synchronization Signal/Physical Broadcast Channel (SS/PBCH))) block, a synchronization signal (Synchronization Signal (SS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), and the like.

The CSI-RS resources may also include at least one of Non Zero Power (NZP) CSI-RS resources, zero Power (ZP) CSI-RS resources, and CSI interference measurement (CSI Interference Measurement (CSI-IM)) resources.

The resources used to measure the signal components for CSI may also be referred to as signal measurement resources (Signal Measurement Resource (SMR)), channel measurement resources (Channel Measurement Resource (CMR)). The SMR (CMR) may also contain NZP CSI-RS resources, SSB, etc. for channel measurement, for example.

The resources used to measure the interference component for CSI may also be referred to as interference measurement resources (Interference Measurement Resource (IMR)). The IMR may also contain at least one of NZP CSI-RS resources, SSB, ZP CSI-RS resources and CSI-IM resources for interference measurements, for example.

The SS/PBCH block is a block including a synchronization signal (e.g., a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSs)), and a PBCH (and corresponding DMRS), and may also be referred to as an SS block (SSB), or the like.

The CSI may include at least one SNR such as a channel quality Indicator (Channel Quality Indicator (CQI)), a precoding matrix Indicator (Precoding Matrix Indicator (PMI)), a CSI-RS resource Indicator (CSI-RS Resource Indicator (CRI)), an SS/PBCH block resource Indicator (SS/PBCH Block Resource Indicator (SSBRI)), a Layer Indicator (LI)), a Rank Indicator (RI)), an L1-RSRP (reference signal received power (Layer 1Reference Signal Received Power) in Layer 1), an L1-RSRQ (reference signal received quality (Reference Signal Received Quality)), an L1-SINR (signal-to-interference-plus-noise ratio (Signal to Interference plus Noise Ratio)), and an L1-SNR (Signal to Noise Ratio).

The UE may also report information about the appropriate power ratio (e.g., preferred power ratio) for each layer to the network (e.g., base station).

For example, the UE may also report information indicating the power ratio between layers (e.g., uplink control information (Uplink Control Information (UCI)) to the base station by including in the CSI report. UCI representing an (appropriate) power ratio between layers may also be referred to as a power ratio indicator (Power Ratio Indicator (PRI)) or the like, for example. PRI may also be an index associated with the power ratio between layers.

The UE may be able to transmit CSI (UCI) including PRI through either PUCCH or PUSCH, or may be able to transmit CSI (UCI) through PUSCH only.

Further, both the appropriate power ratio and CQI described later may be notified using one parameter (a certain index) of UCI. The correspondence of the value of the index to the power ratio and CQI (or MCS) may also be specified/decided by higher layer signaling, physical layer signaling, UE capability, or a combination thereof.

In addition, the appropriate MCS for each layer may also be reported using CSI reports instead of or in addition to the appropriate power ratio.

The UE may also report CSI reports containing CQI for each layer to the base station. The CSI report may include CQIs (CQI indexes) of each of a plurality of layers, or may include a CQI of a certain layer and a differential CQI of CQI from the CQI to other layers. The differential CQI may be a smaller number of bits than the normal CQI.

Fig. 18A shows an example in which a UE reports CSI reports containing a (normal) CQI index for layer 1 and a (normal) CQI index for layer 2 to a Base Station (BS).

Fig. 18B shows an example in which the UE reports CSI reports including a (normal) CQI index for layer 1 and a differential CQI index for layer 2 indicating a difference in CQI indexes from layer 1 to the Base Station (BS).

When the CQI index of one layer is determined based on the CQI index of another layer, the CQI index of another layer may be obtained by CQI index=cqi index of one layer+cqi offset. The CQI offset may be replaced with a CQI index offset, a differential CQI index, or the like. The CQI offset may be an integer or a negative value.

The CQI index of one layer may also represent a CQI index of a layer of the smallest index (e.g., layer 1) or a layer of the largest index (e.g., layer of the largest rank).

The CQI offset may be determined in advance by specification or may be specified/decided by higher layer signaling, physical layer signaling, UE capability, or a combination thereof. The number of bits of the CQI offset field included in the CSI report may also be determined based on at least one of the number of layers, higher layer parameters, and the like.

Fig. 19A and 19B are diagrams showing an example of determination of MCSs of a plurality of layers according to embodiment 2.1. Fig. 19A shows a correspondence relationship between CQI indexes and CQI parameters (modulation scheme, coding rate, and spectral efficiency) that are also used in the conventional rel.15/16 NR.

A table indicating such correspondence relationship may be also referred to as a CQI table, a CQI index table, or the like.

Consider the case where the UE informs CQI index=7 of fig. 19A as the CQI index of layer 1 of CSI report. Fig. 19B is a diagram illustrating an example of correspondence relation between CQI offset levels that can be notified by differential CQI indexes included in the CSI report. The rank may also mean a CQI index indicating how much offset from the CQI index that becomes the reference. In this example. CQI index=6-9 of fig. 19A can also be represented by the differential CQI index of fig. 19B. That is, in this example, the values=0, 1, 2, 3 of the differential CQI index correspond to the CQI indexes=7, 8, 9, 6 of fig. 19A, respectively.

The correspondence of the value of the differential CQI index to the CQI offset (or the indicated CQI index) may also be specified/decided by higher layer signaling, physical layer signaling, UE capabilities, or a combination thereof.

Reporting of CQI of multiple layers using the CQI index field and the differential CQI index field is expected to be reported with a smaller number of bits (low overhead) than reporting of CQI of multiple layers using two CQI index fields.

The UE may also report CQI per PRI/layer to the network if at least one of the following is satisfied:

reporting of RRC parameter "reportquality" specified PRI by RRC parameter set report (e.g., CSI report set (CSI-ReportConfig information element);

the received PDSCH is applied with a different MCS per layer (for example, at least one of conditions 2-1 to 2-5 replaced with respect to the PDSCH in the third embodiment is satisfied).

The bit width of the PRI (CSI) may be determined (or may vary) based on the number of layers (of the reporting object) required for the reporting of the PRI/CQI.

[ [ CQI Table ] ]

In fig. 19A, the CQI table in which the CQI of one layer corresponds to one value of the CQI index (CQI field) is shown, but CQI tables in which the CQI of a plurality of layers corresponds to one value of the CQI index may be used. In this case, the UE may determine CQIs for a plurality of layers from one CQI field, regardless of the CQI offset.

In addition, one CQI table indicating CQIs of a plurality of layers may be referred to, or a plurality of CQI tables each indicating CQIs of a different layer may be referred to. For example, when the UE receives the PDSCH/CSI-RS of the scheduled layer 2, the UE may determine the CQI of layer 0 based on the CQI field and the first table (CQI table for the CQI parameter of layer 0) and determine the CQI of layer 1 based on the same CQI field and the second table (CQI table for the CQI parameter of layer 1).

The UE may also decide the referenced CQI table based on the number of layers of the received PDSCH/CSI-RS.

In addition, regarding one or both of the case where the CQI of one layer is determined for one CQI field and the case where the CQI of a plurality of layers is determined for one CQI field, the UE may refer to the same (common) CQI table (for example, CQI-table parameter of CSI report setting (CSI-ReportConfig information element)) in each layer to determine the CQI parameter of each layer, or refer to different CQI tables for each layer to determine the CQI parameter of each layer.

The CQI table referenced for a certain layer may be determined in advance by specification or may be specified/decided by higher layer signaling, physical layer signaling, UE capability, or a combination thereof. For example, RRC parameters specifying the CQI table to be referred to may be set for each layer.

According to the fourth embodiment described above, a CSI report including information for each layer can be appropriately transmitted.

< another modification of the third embodiment >

MCS control of each TRP in MTRP PDSCH

The MCS control of each layer in the third embodiment may also be applied in the MCS control of each TRP in PDSCH (MTRP PDSCH) from MTRP.

In NR, it is being studied to indicate multiple (e.g., two) TCI states to a UE using a single DCI for performing MTRP PDSCH repetition. Such an operation may also be referred to as a single DCI based multi-TRP operation (single-DCI (s-DCI) based Multi TRP operation).

In addition, when the sdis designates a plurality of RSs (for example, RSs having a plurality of Quasi Co-Location (QCL)) relations and a plurality of RSs of which different channels/signals are QCL type D) (in other words, TCI fields indicating a plurality of different TCI states are designated), the UE may apply different MCSs for PDSCH transmission (reception) corresponding to each of the designated RSs.

For example, when TCI code points of the sdis detected by the UE indicate a plurality of TCI states (activated by the MAC CE), the UE performs reception processing by applying different MCSs to PDSCH corresponding to each TCI state.

The control may be implemented by an embodiment in which "layer" is replaced with at least one of "TRP", "RS (for example, reference RS corresponding to TCI state)", "PDSCH transmission/reception corresponding to RS", "PDSCH", "group of PDSCH transmission/reception corresponding to one or more RSs (group of PDSCH transmission/reception corresponding to one or more RSs), and the like in the third embodiment described above.

Fig. 20 is a diagram showing an example of MCS control for each PDSCH for MTRP PDSCH according to another modification of the third embodiment. For example, consider a case in which the BS1 notifies the UE of the sci of the schedule MTRP PDSCH including the TCI field indicating the TCI state 1 and the TCI state 5 and the information indicating the MCS of each PDSCH.

In this case, as shown in fig. 20, the UE may also apply a low MCS index to the PDSCH (BS 1-oriented) corresponding to the TCI state 1 and apply a high MCS index to the PDSCH (BS 2-oriented) corresponding to the TCI state 5 for reception.

< others >

In addition, at least one of the above embodiments may be applied only to UEs that report or support a specific UE capability (UE capability).

The particular UE capability may also represent at least one of:

whether power control of PUSCH per layer/port/TRP is supported;

whether MCS control of PUSCH per layer/port/TRP is supported;

whether MCS control of PDSCH of each layer/port/TRP is supported;

whether CSI (UCI) reporting per layer/port/TRP is supported.

The specific UE capability may be a capability for PUSCH by CB, a capability for PUSCH by NCB, or a capability not to distinguish between them.

The specific UE capability may be a capability to be applied over all frequencies (common regardless of frequency), a capability per frequency (e.g., cell, band, BWP), a capability per frequency range (e.g., FR1, FR 2), or a capability per subcarrier interval.

The specific UE capability may be a capability to be applied throughout the entire duplex mode (common regardless of the duplex mode), or a capability of each duplex mode (for example, time division duplex (Time Division Duplex (TDD)), frequency division duplex (Frequency Division Duplex (FDD))).

In addition, at least one of the above embodiments may be applied in a case where the UE is set with specific information associated with the above embodiments through higher layer signaling (in a case where it is not set, for example, an operation of rel.15/16 is applied). For example, the specific information may be information indicating power/MCS control of PUSCH/PDSCH activating each layer/port/TRP, an arbitrary RRC parameter for a specific version (e.g., rel.18), or the like. In addition, regarding which embodiment, situation, or condition described above is used to control PHR, the UE may be set using higher layer parameters.

The "layer" of the present disclosure may be replaced with at least one of "TRP", "RS (e.g., SRS, reference RS corresponding to TCI state)", "PUSCH transmission corresponding to RS", "PDSCH transmission/reception corresponding to RS", "PUSCH", "PDSCH transmission by PUSCH corresponding to one or more RSs (including a group of PUSCH transmissions corresponding to one or more RSs)", "PDSCH transmission/reception by one or more RSs (including a group of PDSCH transmission/reception corresponding to one or more RSs)", and the like.

(Wireless communication System)

The 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 embodiments of the present disclosure or a combination thereof.

Fig. 21 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication by using long term evolution (Long Term Evolution (LTE)) standardized by the third generation partnership project (Third Generation Partnership Project (3 GPP)), the fifth generation mobile communication system new wireless (5 th generation mobile communication system New Radio (5G NR)), or the like.

The wireless communication system 1 may support dual connection (Multi-RAT dual connection (Multi-RAT Dual Connectivity (MR-DC))) between a plurality of radio access technologies (Radio Access Technology (RATs)). MR-DC may also include a dual connection of LTE (evolved universal terrestrial radio Access (Evolved Universal Terrestrial Radio Access (E-UTRA))) with NR (E-UTRA-NR dual connection (E-UTRA-NR Dual Connectivity (EN-DC))), NR with LTE (NR-E-UTRA dual connection (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

In EN-DC, a base station (eNB) of LTE (E-UTRA) is a Master Node (MN), and a base station (gNB) of NR is a Slave Node (SN). In NE-DC, the base station (gNB) of NR is MN and the base station (eNB) of LTE (E-UTRA) is SN.

The wireless communication system 1 may also support dual connections between multiple base stations within the same RAT (e.g., dual connection (NR-NR dual connection (NR-NR Dual Connectivity (NN-DC))) of a base station (gNB) where both MN and SN are NRs).

The radio communication system 1 may include a base station 11 forming a macro cell C1 having a relatively wide coverage area, and base stations 12 (12 a to 12C) arranged in the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The arrangement, number, etc. of each cell and user terminal 20 are not limited to those shown in the figure. Hereinafter, the base stations 11 and 12 are collectively referred to as a base station 10 without distinction.

The user terminal 20 may also be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (Carrier Aggregation (CA)) using a plurality of component carriers (Component Carrier (CC)) and Dual Connection (DC).

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

The user terminal 20 may perform communication using at least one of time division duplex (Time Division Duplex (TDD)) and frequency division duplex (Frequency Division Duplex (FDD)) in each CC.

The plurality of base stations 10 may also be connected by wire (e.g., optical fiber based on a common public radio interface (Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication is utilized as a backhaul between the base stations 11 and 12, the base station 11 corresponding to a higher-level station may be referred to as an integrated access backhaul (Integrated Access Backhaul (IAB)) donor (donor), and the base station 12 corresponding to a relay station (relay) may be referred to as an IAB node.

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

The user terminal 20 may be a terminal supporting at least one of communication schemes such as LTE, LTE-a, and 5G.

In the wireless communication system 1, a wireless access scheme based on orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) may be used. For example, cyclic prefix OFDM (Cyclic Prefix OFDM (CP-OFDM)), discrete fourier transform spread OFDM (Discrete Fourier Transform Spread OFDM (DFT-s-OFDM)), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access (OFDMA)), single carrier frequency division multiple access (Single Carrier Frequency Division Multiple Access (SC-FDMA)), and the like may be used in at least one of Downlink (DL)) and Uplink (UL).

The radio access scheme may also be referred to as waveform (waveform). In the radio communication system 1, other radio access schemes (for example, other single carrier transmission schemes and other multi-carrier transmission schemes) may be used for the UL and DL radio access schemes.

As the downlink channel, a downlink shared channel (physical downlink shared channel (Physical Downlink Shared Channel (PDSCH))), a broadcast channel (physical broadcast channel (Physical Broadcast Channel (PBCH)))), a downlink control channel (physical downlink control channel (Physical Downlink Control Channel (PDCCH))), and the like shared by the user terminals 20 may be used in the wireless communication system 1.

As the uplink channel, an uplink shared channel (physical uplink shared channel (Physical Uplink Shared Channel (PUSCH))), an uplink control channel (physical uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (physical random access channel (Physical Random Access Channel (PRACH))), or the like shared by the user terminals 20 may be used in the wireless communication system 1.

User data, higher layer control information, system information blocks (System Information Block (SIBs)), and the like are transmitted through the PDSCH. User data, higher layer control information, etc. may also be transmitted through the PUSCH. In addition, a master information block (Master Information Block (MIB)) may also be transmitted through the PBCH.

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

The DCI scheduling PDSCH may be referred to as DL allocation, DL DCI, or the like, and the DCI scheduling PUSCH may be referred to as UL grant, UL DCI, or the like. The PDSCH may be replaced with DL data, and the PUSCH may be replaced with UL data.

In the detection of PDCCH, a control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may also be utilized. CORESET corresponds to searching for the resources of DCI. The search space corresponds to a search region of PDCCH candidates (PDCCH candidates) and a search method. A CORESET may also be associated with one or more search spaces. The UE may also monitor CORESET associated with a certain search space based on the search space settings.

One search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels (aggregation Level). One or more search spaces may also be referred to as a set of search spaces. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET setting", and the like of the present disclosure may also be replaced with each other.

Uplink control information (Uplink Control Information (UCI)) including at least one of channel state information (Channel State Information (CSI)), transmission acknowledgement information (e.g., also referred to as hybrid automatic repeat request acknowledgement (Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)), ACK/NACK, etc.), and scheduling request (Scheduling Request (SR)) may also be transmitted through the PUCCH. The random access preamble used to establish a connection with a cell may also be transmitted via the PRACH.

In addition, in the present disclosure, downlink, uplink, etc. may be expressed without "link". The present invention may be expressed without "Physical" at the beginning of each channel.

In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like may be transmitted. As DL-RS, a Cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like may be transmitted in the wireless communication system 1.

The synchronization signal may be at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)), for example. The signal blocks including SS (PSS, SSs) and PBCH (and DMRS for PBCH) may also be referred to as SS/PBCH blocks, SS blocks (SSB)), or the like. In addition, SS, SSB, etc. may also be referred to as reference signals.

In the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a reference signal for measurement (sounding reference signal (Sounding Reference Signal (SRS))), a reference signal for Demodulation (DMRS), and the like may be transmitted. In addition, the DMRS may also be referred to as a user terminal specific reference signal (UE-specific Reference Signal).

(base station)

Fig. 22 is a diagram showing an example of a configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmitting/receiving unit 120, a transmitting/receiving antenna 130, and a transmission path interface (transmission line interface (transmission line interface)) 140. The control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140 may be provided with one or more components.

In this example, the functional blocks of the characteristic part in the present embodiment are mainly shown, and it is also conceivable that the base station 10 has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 110 performs control of the entire base station 10. The control unit 110 can be configured by a controller, a control circuit, or the like described based on common knowledge in the technical field of the present disclosure.

The control unit 110 may also control generation of signals, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission/reception, measurement, and the like using the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission path interface 140. The control unit 110 may generate data, control information, a sequence (sequence), and the like transmitted as signals, and forward the generated data to the transmitting/receiving unit 120. The control unit 110 may perform call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of radio resources, and the like.

The transmitting/receiving unit 120 may include a baseband (baseband) unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmitting/receiving unit 120 may be configured of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmitting/receiving circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

The transmitting/receiving unit 120 may be configured as an integral transmitting/receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmission unit may be composed of the transmission processing unit 1211 and the RF unit 122. The receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

The transmitting/receiving antenna 130 may be constituted by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna or the like.

The transmitting/receiving unit 120 may transmit the downlink channel, the synchronization signal, the downlink reference signal, and the like. The transmitting/receiving unit 120 may receive the uplink channel, the uplink reference signal, and the like.

The transmitting-receiving unit 120 may also form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

The transmission/reception section 120 (transmission processing section 1211) may perform processing of a packet data convergence protocol (Packet Data Convergence Protocol (PDCP)) layer, processing of a radio link control (Radio Link Control (RLC)) layer (for example, RLC retransmission control), processing of a medium access control (Medium Access Control (MAC)) layer (for example, HARQ retransmission control), and the like with respect to data, control information, and the like acquired from the control section 110, for example, to generate a bit sequence to be transmitted.

The transmission/reception section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (error correction coding may be included), modulation, mapping, filter processing (filtering processing), discrete fourier transform (Discrete Fourier Transform (DFT)) processing (if necessary), inverse fast fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, and digital-analog conversion on a bit string to be transmitted, and output a baseband signal.

The transmitting/receiving unit 120 (RF unit 122) may perform modulation, filter processing, amplification, etc. on the baseband signal in the radio frequency band, and transmit the signal in the radio frequency band via the transmitting/receiving antenna 130.

On the other hand, the transmitting/receiving unit 120 (RF unit 122) may amplify, filter-process, demodulate a signal in a radio frequency band received through the transmitting/receiving antenna 130, and the like.

The transmitting/receiving section 120 (reception processing section 1212) may apply an analog-to-digital conversion, a fast fourier transform (Fast Fourier Transform (FFT)) process, an inverse discrete fourier transform (Inverse Discrete Fourier Transform (IDFT)) process (if necessary), a filter process, demapping, demodulation, decoding (error correction decoding may be included), a MAC layer process, an RLC layer process, a PDCP layer process, and other reception processes to the acquired baseband signal, and acquire user data.

The transmitting-receiving unit 120 (measuring unit 123) may also perform measurements related to the received signals. For example, measurement section 123 may perform radio resource management (Radio Resource Management (RRM)) measurement, channel state information (Channel State Information (CSI)) measurement, and the like based on the received signal. Measurement section 123 may also measure received power (for example, reference signal received power (Reference Signal Received Power (RSRP))), received quality (for example, reference signal received quality (Reference Signal Received Quality (RSRQ)), signal-to-interference-plus-noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal-to-noise ratio (Signal to Noise Ratio (SNR))), signal strength (for example, received signal strength indicator (Received Signal Strength Indicator (RSSI)), propagation path information (for example, CSI), and the like. The measurement results may also be output to the control unit 110.

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

In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may be configured by at least one of the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140.

The transmitting/receiving unit 120 may transmit information (e.g., DCI, RRC parameters) for applying different modulation and coding schemes (Modulation and coding scheme (MCS)) to the plurality of layers to the user terminal 20.

The transmitting/receiving unit 120 may receive an uplink shared channel (PUSCH) based on the plurality of layers transmitted by the user terminal 20 by applying the different MCSs based on the information.

The transmitting/receiving unit 120 may transmit information (e.g., DCI, RRC parameters) for determining different modulation and coding schemes (Modulation and coding scheme (MCS)) for a plurality of layers to the user terminal 20.

The control unit 110 may perform control of transmitting a downlink shared channel (PDSCH) of the plurality of layers by applying the different MCSs.

The transmitting/receiving unit 120 may transmit information (e.g., DCI, RRC parameters) for applying different power ratios to a plurality of layers to the user terminal 20.

The transmitting/receiving unit 120 may receive uplink shared channels (PUSCHs) of the plurality of layers transmitted by the user terminal 20 by applying the different power ratios based on the information.

The transmitting/receiving unit 120 may transmit information (e.g., DCI, RRC parameters) indicating to generate a channel state information (Channel State Information (CSI)) report including information of each layer to the user terminal 20.

The transmitting/receiving unit 120 may also receive the CSI report from the user terminal 20.

(user terminal)

Fig. 23 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting/receiving unit 220, and a transmitting/receiving antenna 230. The control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided with one or more types.

In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it is also conceivable that the user terminal 20 further has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 210 performs control of the entire user terminal 20. The control unit 210 can be configured by a controller, a control circuit, or the like described based on common knowledge in the technical field of the present disclosure.

The control unit 210 may also control the generation of signals, mapping, etc. The control unit 210 may control transmission/reception, measurement, and the like using the transmission/reception unit 220 and the transmission/reception antenna 230. The control unit 210 may generate data, control information, a sequence, and the like transmitted as signals, and forward the generated data to the transmitting/receiving unit 220.

The transceiver unit 220 may also 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 of 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 knowledge in the technical field of the present disclosure.

The transmitting/receiving unit 220 may be configured as an integral transmitting/receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmission means may be constituted by the transmission processing means 2211 and the RF means 222. The receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

The transmitting/receiving antenna 230 may be constituted by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna or the like.

The transceiver unit 220 may also receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transceiver unit 220 may transmit the uplink channel, the uplink reference signal, and the like.

The transmitting-receiving unit 220 may also form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

The transmission/reception section 220 (transmission processing section 2211) may perform, for example, PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control) and the like with respect to the data, control information and the like acquired from the control section 210, and generate a bit sequence to be transmitted.

The transmission/reception section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (error correction coding may be included), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion, and the like for a bit string to be transmitted, and output a baseband signal.

Further, whether to apply DFT processing may be based on the setting of the transform precoder. For a certain channel (e.g., PUSCH), when the transform precoder is active (enabled), the transmission/reception section 220 (transmission processing section 2211) may perform DFT processing as the transmission processing for transmitting the channel using a DFT-s-OFDM waveform, and if not, the transmission/reception section 220 (transmission processing section 2211) may not perform DFT processing as the transmission processing.

The transmitting/receiving unit 220 (RF unit 222) may perform modulation, filter processing, amplification, etc. for the baseband signal in the radio frequency band, and transmit the signal in the radio frequency band via the transmitting/receiving antenna 230.

On the other hand, the transmitting/receiving unit 220 (RF unit 222) may amplify, filter-process, demodulate a baseband signal, and the like, with respect to a signal in a radio frequency band received through the transmitting/receiving antenna 230.

The transmitting/receiving section 220 (reception processing section 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (error correction decoding may be included), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data.

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

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

The control unit 210 may control the application of different modulation and coding schemes (Modulation and coding scheme (MCS)) to a plurality of layers. The transmitting/receiving unit 220 may transmit the uplink shared channel (PUSCH) of the plurality of layers by applying the different MCSs.

The control unit 210 may determine the different MCSs based on two MCS fields included in Downlink Control Information (DCI).

The control unit 210 may determine the different MCS based on one MCS field included in the downlink control information.

The control unit 210 may also perform control to determine different modulation and coding schemes (Modulation and coding scheme (MCS)) for a plurality of layers. The transmitting/receiving unit 220 may apply the different MCSs to receive the downlink shared channel (PDSCH) of the plurality of layers.

In addition, the control unit 210 may also perform control to apply different power ratios to the plurality of layers. The transmitting/receiving unit 220 may transmit the uplink shared channel (PDSCH) of the plurality of layers by applying the different power ratios.

The control unit 210 may determine the different power ratios based on the precoding information and the layer number field included in the downlink control information.

The control unit 210 may also determine the different power ratios based on a transmission precoding matrix indicator (Transmitted Precoding Matrix Indicator (TPMI)) indicated by the downlink control information.

Further, the control unit 210 may also generate (derive) a channel state information (Channel State Information (CSI)) report containing information of each layer. The transmitting/receiving unit 220 may also transmit the CSI report.

Control unit 210 may also generate the above-described CSI report containing information regarding the appropriate power ratio for each layer.

Control unit 210 may also generate the above-described CSI report containing a channel quality indicator (Channel Quality Indicator (CQI)) index for each layer.

(hardware construction)

The block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. The implementation method of each functional block is not particularly limited. That is, each functional block may be realized by one device physically or logically combined, or two or more devices physically or logically separated may be directly or indirectly connected (for example, by a wire, a wireless, or the like) and realized by these plural devices. The functional blocks may also be implemented by combining the above-described device or devices with software.

Here, the functions include, but are not limited to, judgment, decision, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notification), communication (communication), forwarding (forwarding), configuration (configuration), reconfiguration (reconfiguration), allocation (mapping), assignment (allocation), and the like. For example, a functional block (structural unit) that realizes the transmission function may also be referred to as a transmission unit (transmitting unit), a transmitter (transmitter), or the like. As described above, the implementation method is not particularly limited.

For example, a base station, a user terminal, and the like in one embodiment of the present disclosure may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 24 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The base station 10 and the 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, and the like.

In addition, in the present disclosure, terms of devices, circuits, apparatuses, parts (sections), units, and the like can be replaced with each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to not include a part of the devices.

For example, the processor 1001 is shown as only one, but there may be multiple processors. Further, the processing may be performed by one processor, or the processing may be performed by two or more processors simultaneously, sequentially, or by other means. The processor 1001 may be realized by one or more chips.

Each function in the base station 10 and the user terminal 20 is realized by, for example, reading specific software (program) into hardware such as the processor 1001 and the memory 1002, performing an operation by the processor 1001, controlling communication via the communication device 1004, or controlling at least one of reading and writing of data in the memory 1002 and the memory 1003.

The processor 1001, for example, causes an operating system to operate to control the entire computer. The processor 1001 may be configured by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110 (210), the transmitting/receiving unit 120 (220), and the like described above may be implemented by the processor 1001.

Further, the processor 1001 reads out a program (program code), a software module, data, or the like from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment can be used. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same may be implemented for other functional blocks.

The Memory 1002 may be a computer-readable recording medium, and may be constituted by at least one of a Read Only Memory (ROM), an erasable programmable Read Only Memory (Erasable Programmable ROM (EPROM)), an electrically erasable programmable Read Only Memory (Electrically EPROM (EEPROM)), a random access Memory (Random Access Memory (RAM)), and other suitable storage media, for example. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage), or the like. The memory 1002 can store programs (program codes), software modules, and the like executable to implement a wireless communication method according to an embodiment of the present disclosure.

The storage 1003 may also be a computer-readable recording medium, for example, constituted by at least one of a flexible disk (flexible Disc), a soft (registered trademark) disk, an magneto-optical disk (for example, a Compact Disc read only memory (CD-ROM), etc.), a digital versatile Disc, a Blu-ray (registered trademark) disk, a removable magnetic disk (removables), a hard disk drive, a smart card, a flash memory device (for example, a card, a stick, a key drive), a magnetic stripe (strip), a database, a server, and other suitable storage medium. The storage 1003 may also be referred to as secondary storage.

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 referred to as a network device, a network controller, a network card, a communication module, or the like, for example. In order to realize at least one of frequency division duplexing (Frequency Division Duplex (FDD)) and time division duplexing (Time Division Duplex (TDD)), the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like. For example, the transmitting/receiving unit 120 (220), the transmitting/receiving antenna 130 (230), and the like described above may be implemented by the communication device 1004. The transmitting/receiving unit 120 (220) may be implemented by physically or logically separating the transmitting unit 120a (220 a) and the receiving unit 120b (220 b).

The input device 1005 is an input apparatus (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like) that receives an input from the outside. The output device 1006 is an output apparatus (for example, a display, a speaker, a light emitting diode (Light Emitting Diode (LED)) lamp, or the like) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

The processor 1001, the memory 1002, and other devices are connected by a bus 1007 for communicating information. The bus 1007 may be formed using a single bus or may be formed using different buses between devices.

The base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an application specific integrated circuit (Application Specific Integrated Circuit (ASIC)), a programmable logic device (Programmable Logic Device (PLD)), and a field programmable gate array (Field Programmable Gate Array (FPGA)), or may be configured to implement a part or all of the functional blocks by using the hardware. For example, the processor 1001 may also be implemented using at least one of these hardware.

(modification)

In addition, with respect to terms described in the present disclosure and terms required for understanding the present disclosure, terms having the same or similar meanings may be substituted. For example, channels, symbols, and signals (signals or signaling) may also be interchanged. In addition, the signal may also be a message. The Reference Signal (RS) can also be simply referred to as RS, and may also be referred to as Pilot (Pilot), pilot Signal, or the like, depending on the standard applied. In addition, the component carrier (Component Carrier (CC)) may also be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

A radio frame may also consist of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be formed of one or more slots in the time domain. The subframes may also be a fixed length of time (e.g., 1 ms) independent of the parameter set (numerology).

Here, the parameter set may also be a communication parameter applied in at least one of transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of a subcarrier spacing (SubCarrier Spacing (SCS)), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (Transmission Time Interval (TTI)), a number of symbols per TTI, a radio frame structure, a specific filter process performed by a transceiver in a frequency domain, a specific windowing (windowing) process performed by a transceiver in a time domain, and the like.

A slot may also be formed in the time domain from one or more symbols, orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, single carrier frequency division multiple access (Single Carrier Frequency Division Multiple Access (SC-FDMA)) symbols, and so on. Furthermore, the time slots may also be time units based on parameter sets.

The time slot may also contain a plurality of mini-slots. Each mini-slot may also be formed of one or more symbols in the time domain. In addition, the mini-slot may also be referred to as a sub-slot. Mini-slots may also be made up of a fewer number of symbols than slots. PDSCH (or PUSCH) transmitted in a larger time unit than the mini-slot may also be referred to as PDSCH (PUSCH) mapping type a. PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

The radio frame, subframe, slot, mini-slot, and symbol each represent a unit of time when a signal is transmitted. The radio frames, subframes, slots, mini-slots, and symbols may also use other designations that each corresponds to. In addition, the frame, subframe, slot, mini-slot, symbol, and the like units in the present disclosure may also be replaced with each other.

For example, one subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as a TTI, and one slot or one mini-slot may also be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the conventional LTE, may be a period (for example, 1 to 13 symbols) shorter than 1ms, or may be a period longer than 1 ms. The unit indicating the TTI may be referred to as a slot, a mini-slot, or the like, instead of a subframe.

Here, TTI refers to, for example, a scheduled minimum time unit in wireless communication. For example, in the LTE system, a base station performs scheduling for each user terminal to allocate radio resources (frequency bandwidth, transmission power, and the like that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a data packet (transport block), a code block, a codeword, or the like subjected to channel coding, or may be a processing unit such as scheduling or link adaptation. In addition, when a TTI is given, a time interval (e.g., the number of symbols) in which a transport block, a code block, a codeword, etc. are actually mapped may be shorter than the TTI.

In addition, in the case where one slot or one mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may also be the minimum time unit of scheduling. In addition, the number of slots (mini-slots) constituting the minimum time unit of the schedule can also be controlled.

A TTI having a time length of 1ms may also be referred to as a normal TTI (TTI in 3gpp rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a slot, etc. A TTI that is shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length less than the long TTI and a TTI length of 1ms or more.

A Resource Block (RB) is a Resource allocation unit of a time domain and a frequency domain, and may include one or a plurality of consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the parameter set, and may be 12, for example. The number of subcarriers included in the RB may also be decided based on the parameter set.

Further, the RB may also contain one or more symbols in the time domain, and may be one slot, one mini-slot, one subframe, or one TTI in length. One TTI, one subframe, etc. may also be respectively composed of one or more resource blocks.

In addition, one or more RBs may also be referred to as Physical Resource Blocks (PRBs), subcarrier groups (SCGs), resource element groups (Resource Element Group (REGs)), PRB pairs, RB peering.

Furthermore, a Resource block may also be composed of one or more Resource Elements (REs). For example, one RE may be a subcarrier and a radio resource area of one symbol.

A Bandwidth Part (BWP) (which may also be referred to as a partial Bandwidth, etc.) may also represent a subset of consecutive common RBs (common resource blocks (common resource blocks)) for a certain parameter set in a certain carrier. Here, the common RB may also be determined by an index of the RB with reference to the common reference point of the carrier. PRBs may be defined in a BWP and numbered in the BWP.

The BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL). For a UE, one or more BWP may also be set in one carrier.

At least one of the set BWP may be active, and the UE may not contemplate transmission and reception of a specific channel/signal other than the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be replaced with "BWP".

The above-described configurations of radio frames, subframes, slots, mini slots, symbols, and the like 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 mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like can be variously changed.

The information, parameters, and the like described in the present disclosure may be expressed in absolute values, relative values to a specific value, or other corresponding information. For example, radio resources may also be indicated by a particular index.

In the present disclosure, the names used for parameters and the like are not restrictive names in all aspects. Further, the mathematical expression or the like using these parameters may also be different from that explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting names in all respects.

Information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips (chips), and the like may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

Further, information, signals, etc. can be output in at least one of the following directions: from higher layer (upper layer) to lower layer (lower layer), and from lower layer to higher layer. Information, signals, etc. may also be input and output via a plurality of network nodes.

The input/output information, signals, and the like may be stored in a specific location (for example, a memory), or may be managed by a management table. The input and output information, signals, etc. may be overwritten, updated, or added. The outputted information, signals, etc. may also be deleted. The input information, signals, etc. may also be transmitted to other devices.

The notification of information is not limited to the embodiment described in the present disclosure, but may be performed by other methods. For example, notification of information in the present disclosure may also be implemented by physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI)))), higher layer signaling (e.g., radio resource control (Radio Resource Control (RRC)) signaling, broadcast information (master information block (Master Information Block (MIB)), system information block (System Information Block (SIB)) or the like), medium access control (Medium Access Control (MAC)) signaling), other signals, or a combination thereof.

The physical Layer signaling may be referred to as Layer 1/Layer 2 (L1/L2)) control information (L1/L2 control signal), L1 control information (L1 control signal), or the like. The RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration)) message, or the like. The MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).

Note that the notification of specific information (for example, notification of "X") is not limited to explicit notification, and may be performed implicitly (for example, by notification of no specific information or notification of other information).

The determination may be performed by a value (0 or 1) represented by one bit, a true or false value (boolean) represented by true or false, or a comparison of values (e.g., with a specific value).

Software, whether referred to as software (firmware), middleware (middleware-software), microcode (micro-code), hardware description language, or by other names, should be construed broadly to mean instructions, instruction sets, codes (codes), code segments (code fragments), program codes (program codes), programs (programs), subroutines (sub-programs), software modules (software modules), applications (applications), software applications (software application), software packages (software packages), routines (routines), subroutines (sub-routines), objects (objects), executable files, threads of execution, procedures, functions, and the like.

In addition, software, instructions, information, etc. may also be transmitted and received via a transmission medium. For example, in the case of transmitting software from a website, server, or other remote source (remote source) using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (Digital Subscriber Line (DSL)), etc.) and wireless technology (infrared, microwave, etc.), the at least one of wired technology and wireless technology is included in the definition of transmission medium.

The terms "system" and "network" as used in this disclosure can be used interchangeably. "network" may also mean a device (e.g., a base station) included in a network.

In the present disclosure, terms such as "precoding", "precoder", "weight", "Quasi Co-Location", "transmission setting instruction state (Transmission Configuration Indication state (TCI state))", "spatial relationship", "spatial domain filter (spatial domain filter)", "transmission power", "phase rotation", "antenna port group", "layer number", "rank", "resource set", "resource group", "beam width", "beam angle", "antenna element", "panel", and the like can be used interchangeably.

In the present disclosure, terms such as "Base Station (BS))", "radio Base Station", "fixed Station", "NodeB", "eNB (eNodeB)", "gNB (gndeb)", "access Point", "Transmission Point (Transmission Point (TP))", "Reception Point (RP))", "Transmission Reception Point (Transmission/Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier", and the like can be used interchangeably. There are also cases where the base station is referred to by terms of a macrocell, a small cell, a femtocell, a picocell, and the like.

The base station can accommodate one or more (e.g., three) cells. In the case of a base station accommodating a plurality of cells, the coverage area of the base station can be divided into a plurality of smaller areas, each of which can also provide communication services through a base station subsystem, such as a small base station for indoor use (remote radio head (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a portion or the entirety of the coverage area of at least one of the base station and the base station subsystem that is in communication service within that coverage area.

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

There are also situations where a mobile station is referred to by a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand-held communicator (hand set), user agent, mobile client, or a number of other suitable terms.

At least one of the base station and the mobile station may also be referred to as a transmitting apparatus, a receiving apparatus, a wireless communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the like. The mobile body may be a vehicle (e.g., a vehicle, an airplane, etc.), a mobile body that moves unmanned (e.g., an unmanned aerial vehicle (clone), an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may be an internet of things (Internet of Things (IoT)) device such as a sensor.

In addition, the base station in the present disclosure may be replaced with a user terminal. For example, the various aspects/embodiments 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 (for example, may also be referred to as Device-to-Device (D2D)), vehicle-to-evaluation (V2X), or the like. In this case, the user terminal 20 may have the functions of the base station 10 described above. In addition, terms such as "upstream", "downstream", and the like may be replaced with terms corresponding to communication between terminals (e.g., "side"). For example, the uplink channel, the downlink channel, etc. may be replaced with a side channel.

Likewise, the user terminal in the present disclosure may be replaced with a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

In the present disclosure, the operation performed by the base station may be performed by an upper node (upper node) according to circumstances. Obviously, in a network comprising one or more network nodes (network nodes) with base stations, various operations performed for communication with a terminal may be performed by a base station, one or more network nodes other than a base station (e.g. considering a mobility management entity (Mobility Management Entity (MME)), a Serving-Gateway (S-GW)), etc., but not limited thereto, or a combination thereof.

The embodiments described in the present disclosure may be used alone, in combination, or switched depending on the execution. The processing procedures, sequences, flowcharts, and the like of the embodiments and embodiments described in this disclosure may be changed in order as long as they are not contradictory. For example, for the methods described in this disclosure, elements of the various steps are presented using the illustrated order, but are not limited to the particular order presented.

The various modes/embodiments described in the present disclosure can also be applied to long term evolution (Long Term Evolution (LTE)), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), upper 3G, IMT-Advanced, fourth-generation mobile communication system (4 th generation mobile communication system (4G)), fifth-generation mobile communication system (5 th generation mobile communication system (5G)), sixth-generation mobile communication system (6 th generation mobile communication system (6G)), x-th-generation mobile communication system (xth generation mobile communication system (xG)) (xG (x is, for example, an integer, a decimal)), future wireless access (Future Radio Access (FRA)), new wireless access technology (New-Radio Access Technology (RAT)), new wireless (New Radio (NR)), new Radio access (NX), new-generation wireless access (Future generation Radio access (FX)), global system for mobile communication (Global System for Mobile communications (GSM (registered trademark)), 2000, ultra mobile broadband (Ultra Mobile Broadband (UMB)), IEEE 802.11 (IEEE-Fi (registered trademark) 802.16 (Wi) and (registered trademark), bluetooth (20) and other suitable methods based on them, and the like, and the Ultra-WideBand (UWB) can be obtained, multiple systems may also be applied in combination (e.g., LTE or LTE-a, in combination with 5G, etc.).

The term "based on" as used in the present disclosure is not intended to mean "based only on" unless specifically written otherwise. In other words, the recitation of "based on" means "based only on" and "based at least on" both.

Any reference to elements using references to "first," "second," etc. in this disclosure does not fully define the amount 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, reference to a first and second element does not mean that only two elements may be employed, or that the first element must be in some form prior to the second element.

The term "determining" used in the present disclosure may include various actions. For example, the "judgment (decision)" may be a case where judgment (decision), calculation (calculation), processing (processing), derivation (development), investigation (investigation), search (lookup), search, inquiry (search in a table, database, or other data structure), confirmation (evaluation), or the like is regarded as "judgment (decision)".

The "determination (decision)" may be a case where reception (e.g., reception of information), transmission (e.g., transmission of information), input (input), output (output), access (processing) (e.g., access to data in a memory), or the like is regarded as "determination (decision)".

The "judgment (decision)" may be a case where resolution (resolution), selection (selection), selection (setting), establishment (establishment), comparison (comparison), or the like is regarded as "judgment (decision)". That is, the "judgment (decision)" may be a case where some actions are regarded as "judgment (decision)" to be performed.

Further, "judgment (decision)" may be replaced with "assumption", "expectation", "consider", or the like.

The terms "connected", "coupled", or all variations thereof as used in this disclosure mean all connections or couplings, either direct or indirect, between two or more elements thereof, and can include the case where one or more intervening elements are present between two elements that are "connected" or "coupled" to each other. The bonding or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may be replaced with "access".

In the present disclosure, where two elements are connected, it is contemplated that more than one wire, cable, printed electrical connection, etc. can be used, and electromagnetic energy, etc. having wavelengths in the wireless frequency domain, the microwave region, the optical (both visible and invisible) region, etc. can be used as several non-limiting and non-inclusive examples, to be "connected" or "joined" to each other.

In the present disclosure, the term "a is different from B" may also mean that "a is different from B". In addition, the term may also mean that "A and B are each different from C". Terms such as "separate," coupled, "and the like may also be construed in the same manner as" different.

In the case where "including", "containing", and variations thereof are used in the present disclosure, these terms are meant to be inclusive in the same sense as the term "comprising". Further, the term "or" as used in this disclosure does not mean exclusive or.

In the present disclosure, for example, in the case where an article is appended by translation as in a, an, and the in english, the present disclosure may also include the case where a noun following the article is in plural form.

While the invention according to the present disclosure has been described in detail, it is obvious to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as a modification and variation without departing from the spirit and scope of the invention defined based on the description of the claims. Accordingly, the description of the present disclosure is for illustrative purposes and is not intended to limit the invention in any way.

Claims

1. A terminal, comprising:

a control unit for generating a channel state information report (CSI report) including information of each layer; and

and the sending unit is used for sending the CSI report.

2. The terminal of claim 1, wherein,

the control unit generates the CSI report containing information about the appropriate power ratio for each layer.

3. The terminal of claim 1 or claim 2, wherein,

the control unit generates the CSI report including a channel quality indicator index, i.e., CQI index, of each layer.

4. A wireless communication method for a terminal includes:

a step of generating a channel state information report, i.e., a CSI report, including information of each layer; and

And sending the CSI report.

5. A base station, comprising:

a transmitting unit configured to transmit, to a terminal, information indicating that a CSI report, which is a channel state information report including information for each layer, is generated; and

and a receiving unit for receiving the CSI report from the terminal.