WO2022224457A1 - 端末、無線通信方法及び基地局 - Google Patents
端末、無線通信方法及び基地局 Download PDFInfo
- Publication number
- WO2022224457A1 WO2022224457A1 PCT/JP2021/016544 JP2021016544W WO2022224457A1 WO 2022224457 A1 WO2022224457 A1 WO 2022224457A1 JP 2021016544 W JP2021016544 W JP 2021016544W WO 2022224457 A1 WO2022224457 A1 WO 2022224457A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layers
- transmission
- srs
- antenna
- information
- Prior art date
Links
- 238000004891 communication Methods 0.000 title description 57
- 238000000034 method Methods 0.000 title description 36
- 230000005540 biological transmission Effects 0.000 claims abstract description 145
- 238000012545 processing Methods 0.000 description 52
- 230000011664 signaling Effects 0.000 description 23
- 230000006870 function Effects 0.000 description 21
- 238000005259 measurement Methods 0.000 description 21
- 238000010586 diagram Methods 0.000 description 20
- 230000001427 coherent effect Effects 0.000 description 11
- 230000009977 dual effect Effects 0.000 description 10
- 239000011159 matrix material Substances 0.000 description 9
- 238000010295 mobile communication Methods 0.000 description 9
- 238000013507 mapping Methods 0.000 description 8
- 238000001914 filtration Methods 0.000 description 7
- 238000007726 management method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 102100040160 Rabankyrin-5 Human genes 0.000 description 4
- 101710086049 Rabankyrin-5 Proteins 0.000 description 4
- 230000003321 amplification Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013468 resource allocation Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 101000741965 Homo sapiens Inactive tyrosine-protein kinase PRAG1 Proteins 0.000 description 1
- 102100038659 Inactive tyrosine-protein kinase PRAG1 Human genes 0.000 description 1
- 108700026140 MAC combination Proteins 0.000 description 1
- 101150071746 Pbsn gene Proteins 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
- H04W8/24—Transfer of terminal data
Definitions
- the present disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- 3GPP Rel. 10-14 LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).
- LTE successor systems for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later
- 5G 5th generation mobile communication system
- 5G+ 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately control UL transmission with a larger number of layers.
- a terminal includes a control unit that determines the number of antenna ports M and the number of layers N that is less than M, and a transmission unit that transmits a physical uplink shared channel using N layers. , has
- UL transmission with a larger number of layers can be appropriately controlled.
- 1A and 1B are diagrams illustrating an example of layer/rank number limitations.
- 2A and 2B are diagrams illustrating an example of how to use transmit antennas.
- 3A and 3B are diagrams illustrating an example of a transmit antenna indication method.
- 4A and 4B are diagrams illustrating an example of UE capability information regarding antenna coherency according to the first embodiment.
- FIG. 8 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment.
- FIG. 9 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- FIG. 10 is a diagram illustrating an example of the configuration of a user terminal according to one embodiment.
- FIG. 11 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to one embodiment.
- the UE uses information (SRS configuration information, e.g., RRC control element "SRS-Config" used for transmission of measurement reference signals (e.g., Sounding Reference Signal (SRS)) parameters) may be received.
- SRS configuration information e.g., RRC control element "SRS-Config" used for transmission of measurement reference signals (e.g., Sounding Reference Signal (SRS))
- SRS-Config used for transmission of measurement reference signals (e.g., Sounding Reference Signal (SRS)) parameters
- the UE receives information on one or more SRS resource sets (SRS resource set information, e.g., "SRS-ResourceSet” of the RRC control element) and information on one or more SRS resources (SRS resource information, eg, "SRS-Resource” of the RRC control element).
- SRS resource set information e.g., "SRS-ResourceSet” of the RRC control element
- SRS resource information e.g. "SRS-Resource” of the RRC control element
- One SRS resource set may be associated with one or more SRS resources (one or more SRS resources may be grouped together). Each SRS resource may be identified by an SRS resource indicator (SRI) or an SRS resource ID (Identifier).
- SRI SRS resource indicator
- SRS resource ID Identifier
- the SRS resource set information may include an SRS resource set ID (SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, an SRS resource type, and SRS usage information.
- SRS-ResourceSetId SRS resource set ID
- SRS-ResourceId SRS resource set ID
- SRS resource type SRS resource type
- SRS usage information SRS usage information
- the SRS resource types are periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic CSI (Aperiodic SRS (A-SRS)).
- P-SRS periodic SRS
- SP-SRS semi-persistent SRS
- A-SRS aperiodic CSI
- the UE may transmit P-SRS and SP-SRS periodically (or periodically after activation) and transmit A-SRS based on DCI's SRS request.
- usage of RRC parameter, "SRS-SetUse” of L1 (Layer-1) parameter) is, for example, beam management (beamManagement), codebook (CB), noncodebook (noncodebook ( NCB)), antenna switching, and the like.
- SRS for codebook or non-codebook applications may be used for precoder determination for codebook-based or non-codebook-based Physical Uplink Shared Channel (PUSCH) transmission based on SRI.
- PUSCH Physical Uplink Shared Channel
- the UE may, based on the SRI, the Transmitted Rank Indicator (TRI) and the Transmitted Precoding Matrix Indicator (TPMI) may determine the precoder for PUSCH transmission.
- the UE may determine the precoder for PUSCH transmission based on the SRI for non-codebook-based transmission.
- SRS resource information includes SRS resource ID (SRS-ResourceId), SRS port number, SRS port number, transmission Comb, SRS resource mapping (eg, time and/or frequency resource position, resource offset, resource period, repetition number, SRS number of symbols, SRS bandwidth, etc.), hopping related information, SRS resource type, sequence ID, spatial relationship information of SRS, and so on.
- the spatial relationship information of the SRS may indicate the spatial relationship information between the reference signal and the SRS.
- the reference signal includes a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block, a Channel State Information Reference Signal (CSI-RS) and an SRS (for example, another SRS) may be at least one of An SS/PBCH block may be referred to as a Synchronization Signal Block (SSB).
- SS/PBCH Synchronization Signal/Physical Broadcast Channel
- CSI-RS Channel State Information Reference Signal
- SRS for example, another SRS
- SSB Synchronization Signal Block
- the SRS spatial relationship information may include at least one of the SSB index, CSI-RS resource ID, and SRS resource ID as the reference signal index.
- the SSB index, SSB resource ID, and SSB Resource Indicator may be read interchangeably.
- the CSI-RS index, CSI-RS resource ID and CSI-RS resource indicator (CRI) may be read interchangeably.
- the SRS index, the SRS resource ID, and the SRI may be read interchangeably.
- the spatial relationship information of the SRS may include the serving cell index, BWP index (BWP ID), etc. corresponding to the reference signal.
- a spatial domain filter for reception of the SSB or CSI-RS and The same spatial domain filter (spatial domain transmit filter) may be used to transmit the SRS resource.
- the UE may assume that the UE receive beam for SSB or CSI-RS and the UE transmit beam for SRS are the same.
- a spatial domain filter for the transmission of this reference SRS may be transmitted using the same spatial domain filter (spatial domain transmit filter) as (spatial domain transmit filter). That is, in this case, the UE may assume that the UE transmission beam of the reference SRS and the UE transmission beam of the target SRS are the same.
- a UE may determine the spatial relationship of PUSCHs scheduled by DCI based on the value of a field (eg, SRS Resource Identifier (SRI) field) within a DCI (eg, DCI format 0_1). Specifically, the UE may use the spatial relationship information (eg, “spatialRelationInfo” of the RRC information element) of the SRS resource determined based on the value of this field (eg, SRI) for PUSCH transmission.
- a field eg, SRS Resource Identifier (SRI) field
- SRI Spatial Reference Resource Identifier
- the UE when using codebook-based transmission for PUSCH, uses a codebook SRS resource set with a maximum of 2 SRS resources configured by RRC, and the maximum 2 SRS One of the resources may be indicated by DCI (1-bit SRI field).
- the PUSCH transmission beam will be specified by the SRI field.
- the UE may determine the TPMI and the number of layers (transmission rank) for PUSCH based on the precoding information and the number of layers field (hereinafter also referred to as the precoding information field).
- the UE selects the TPMI from the uplink codebook for the same number of SRS ports as the number of SRS ports indicated by the higher layer parameter "nrofSRS-Ports" set for the SRS resource specified by the SRI field,
- a precoder may be selected based on the number of layers, or the like.
- the UE when non-codebook-based transmission is used for PUSCH, the UE is configured by RRC with an SRS resource set with up to four SRS resources and non-codebook usage, and the maximum One or more of the four SRS resources may be indicated by the 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 by the SRI field is the same as the number of layers for PUSCH. Also, the UE may calculate a precoder for the SRS resource.
- the transmission beam of the PUSCH is configured may be calculated based on (a measurement of) the associated CSI-RS. Otherwise, the PUSCH transmit beam may be designated by the SRI.
- the UE may set whether to use codebook-based PUSCH transmission or non-codebook-based PUSCH transmission by a higher layer parameter "txConfig" indicating the transmission scheme.
- the parameter may indicate a "codebook” or “nonCodebook” value.
- codebook-based PUSCH (codebook-based PUSCH transmission, codebook-based transmission, codebook-based UL transmission) may refer to PUSCH when the UE is configured with "codebook" as the transmission scheme.
- non-codebook-based PUSCH (non-codebook-based PUSCH transmission, non-codebook-based transmission, non-codebook-based UL transmission) is PUSCH when "non-codebook" is set as the transmission scheme to the UE. may mean.
- rank n ⁇ mTx denotes the case where m transmit antennas are used and the maximum rank is limited to n. Comparing rank 4-4Tx, rank 4-8Tx, rank 6-8Tx, and rank 8-8Tx by evaluation in the above scenario, the highest performance is obtained in the case of rank 6-8Tx. In the cases of rank 6-8Tx and rank 8-8Tx, the probability of scheduling for each number of layers (rank distribution, number of scheduled layers, number of adaptively controlled layers) is highest for 5 and 6 layers. Even if the UE has 8 transmit antennas, higher performance is observed when the maximum rank is restricted (eg to rank 4 or 6).
- the inventors came up with a method for appropriately performing UL transmission with a larger number of layers.
- A/B/.../X may mean "at least one of A, B,... and X”.
- higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- RRC, RRC signaling, RRC parameters, higher layer parameters, RRC information elements (IEs), RRC messages, and configuration may be read interchangeably.
- Broadcast information includes, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), and other system information ( It may be Other System Information (OSI).
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI System Information
- Physical layer signaling may be, for example, downlink control information (DCI).
- DCI downlink control information
- activate, deactivate, indicate (or indicate), select, configure, update, determine, etc. may be read interchangeably.
- Panel, Beam, Panel Group, Beam Group, Uplink (UL) transmitting entity, TRP, Spatial Relationship Information (SRI), Spatial Relationship, Control Resource Set (COntrol Resource SET (CORESET)), Physical Downlink Shared Channel (PDSCH), codeword, base station, antenna port (for example, demodulation reference signal (DeModulation Reference Signal (DMRS)) port), antenna port group (for example, DMRS port group), group (for example, code division multiplexing (Code Division Multiplexing (CDM)) group, reference signal group, CORESET group), resource (e.g., reference signal resource), resource set (e.g., reference signal resource set), CORESET pool, PUCCH group (PUCCH resource group), spatial relationship group, Downlink TCI state (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, QCL, etc. may be read interchangeably.
- the spatial relationship information Identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be read interchangeably.
- “Spatial relationship information” may be read interchangeably as “a set of spatial relationship information”, “one or more spatial relationship information”, and the like.
- the TCI state and TCI may be read interchangeably.
- indexes, IDs, indicators, and resource IDs may be read interchangeably.
- sequences, lists, sets, groups, groups, clusters, subsets, etc. may be read interchangeably.
- limit, upper limit, limit, restriction, and maximum number may be read interchangeably.
- rank number of layers, number of MIMO layers, number of transmission layers, number of spatial multiplexing, and number of streams may be read interchangeably.
- spatial relation information SRI
- spatial relation information for PUSCH SRI
- spatial relation information for PUSCH SRI
- spatial relation information for PUSCH SRI
- spatial relation information for PUSCH SRI
- spatial relation information for PUSCH SRI
- spatial relation information for PUSCH SRI
- spatial relation information for PUSCH spatial relation
- UL beam UL beam
- UE transmission beam UL TCI
- UL TCI state UL TCI state
- spatial relationship of UL TCI state SRS Resource Indicator
- SRI SRS Resource Indicator
- the maximum number of ranks/MIMO layers may be limited to N.
- (M, N) combinations supported by the UE may be reported as UE capabilities.
- the (M, N) combination or the value of N may be set by higher layer signaling.
- N is preferably less than or equal to M in MIMO.
- the restriction by N smaller than M has at least one of the following benefits.
- Lower DCI overhead Required number of DCI fields for TPMI in codebook-based UL MIMO (maximum number, bits, size) and required number of SRI fields for non-codebook-based UL MIMO (maximum number, bits, size) and can be reduced.
- the layer/rank restrictions may follow either of the two options 1 and 2 below.
- the value of N or the number of layers/ranks supported is defined by the specification.
- a number of layers/ranks of 1 is supported.
- the number of layers/ranks 1, 2 are supported.
- the number of transmit antennas M 8, the number of layers/ranks 1, 2, 3, 4, 5, 6 are supported.
- N No limit on N (N equal to M) may be supported in the specification. Higher layer signaling may limit the value of N.
- a (different) value of N may be set for each number M of transmit antennas.
- the UE may determine the number of antenna ports, M, and the number of layers/ranks, N, which is less than M, and transmit PUSCH using the N layers/ranks.
- the number of layers/ranks may be limited to N if M is greater than a certain number.
- the specific number may be N or a number greater than four.
- N may be 6 or may be a number smaller than 8.
- the UE may use transmit antennas according to either transmit antenna usage methods 1 and 2 below.
- the UE uses all M transmit antennas, but the maximum rank is limited to N.
- the UE selects N transmit antennas among the M transmit antennas, uses all of the N transmit antennas, and has a maximum rank of N.
- antenna selection may be performed by the network and indicated to the UE by the DCI/MAC CE/RRC IE.
- the indication may be a new DCI field for TPMI, SRI, or PUSCH scheduling.
- Antenna selection may be performed by the UE based on DL RS/channel measurements on each antenna port. For example, in the example of FIG. 2B, the UE may select the best (top) 6 transmit antennas with the largest (top 6) RSRP measurements.
- ⁇ Transmitting antenna instruction method> When selection of a transmit antenna port to be used for PUSCH transmission is instructed based on transmit antenna usage method 2, the UE may be instructed which transmit antenna to use according to any of transmit antenna indication methods 1 to 3 below. good.
- the indication may indicate whether or not each transmit antenna port is used.
- the indication may be a bitmap.
- a bitmap may have M bits. The M bits may correspond to the M transmit antenna ports, respectively. The value of each bit may be 1 if the corresponding antenna port is used. Signaling overhead increases as the number of transmit antenna ports increases.
- the indication may be DCI/MAC CE/RRC IE.
- Multiple candidates for the transmit antenna port may be indicated/configured by the RRC IE/MAC CE, and one of the multiple candidates may be selected by the DCI.
- indices are associated with multiple candidate combinations (sets, groups, lists) of transmit antenna ports. Multiple candidates may be set/indicated by the RRC IE/MAC CE. The relationship between multiple candidates and indices may be defined in the specification, and the indices may be set/indicated by the RRC IE/MAC CE.
- a transmit antenna port for PUSCH is associated with a transmit antenna port for SRS.
- the UE transmits the SRS resources on multiple time resources using different combinations of transmit antenna ports.
- the network indicates which antenna port of which SRS resource index is used for PUSCH.
- a mechanism similar to SRS with beam management applications for PUSCH spatial relationship indication may be used.
- SRS #1 to #4 are respectively associated with multiple transmit antenna ports, and SRS #1 to #4 are transmitted on different time resources.
- the network indicates the SRS resource index (SRS#2) in the PUSCH scheduling
- the transmit antenna ports of the indicated SRS resource are associated with the SRS.
- the UE uses the corresponding transmit antenna port for PUSCH transmission.
- a first embodiment relates to a UE transmit antenna configuration to support a number of layers greater than four.
- the UE may report UE capability information to the network indicating that it supports transmission with more than four antenna ports.
- the UE capability information may be referred to as UE capability information regarding transmit antenna configuration.
- the UE capability information regarding transmit antenna configuration may include information regarding the number of transmit antenna ports supported by the UE (e.g., 6, 8, etc.) and for codebook-based PUSCH/non-codebook-based PUSCH supported by the UE. It may also contain information about the maximum number of layers.
- Information about the maximum number of layers for the codebook-based PUSCH and information about the maximum number of layers for the non-codebook-based PUSCH are, for example, by RRC parameters "maxNumberMIMO-LayersCB-PUSCH” and “maxNumberMIMO-LayersNonCB-PUSCH” respectively. may be shown. Note that any parameter name in this disclosure may be given a suffix indicating a particular release (eg, "r_18") or the like.
- the UE may report UE capability information regarding antenna coherency to the network.
- the UE capability information regarding antenna coherency may be included in the UE capability information regarding the transmit antenna configuration, or may be included in another UE capability information.
- UE capability information regarding the antenna coherency may be indicated by, for example, the RRC parameter “pusch-TransCoherence”.
- the UE capability information regarding the antenna coherency may include information regarding at least one of antenna assumptions and codebook subsets.
- the UE capability information regarding the antenna coherency may be specified by "fullyAndPartialAndNonCoherent”, “partialAndNonCoherent”, “NonCoherent”, and the like.
- the UE capability information regarding the antenna coherency may indicate a set of coherent antennas, the number of ports included in the set, or the number of the set. For example, a UE that supports 6 antenna port transmission may report "(X1, X2, X3)" as UE capability information for the antenna coherency.
- Xi (i is an integer) indicates the number of antenna ports included in a set of one or more coherent antenna ports.
- Xi can take a value greater than or equal to 0 and less than or equal to the maximum number of antenna ports.
- ⁇ i Xi may correspond to the maximum number of antenna ports supported by the UE.
- Xi (i is an integer) may indicate the number of ports included in one frame, and in this case, the UE capability information regarding the antenna coherency may indicate the number of ports included in each frame.
- a frame is a unit of grouping/combining antenna ports, and may be read as a panel, a panel group, an antenna group, an antenna port group, an antenna port set, a beam group, or the like.
- 4A and 4B are diagrams showing an example of UE capability information regarding antenna coherency according to the first embodiment.
- FIG. 4A corresponds to a transmit antenna configuration in which all antenna ports are coherent within the frame.
- FIG. 4B corresponds to a transmit antenna configuration in which the combination of two antenna ports in a frame is coherent and has three such pairs (frames). Antenna ports between different frames are non-coherent.
- (X1, X2, X3, X4) (4, 4, 0, 0) means that the set of four antenna ports within a frame is coherent, the antenna ports between different frames are non-coherent, and this frame is A transmit antenna configuration with two may be shown.
- (X1, X2, X3, X4) (2, 2, 2, 2) means that the set of two antenna ports in the frame is coherent, the antenna ports between different frames are non-coherent, and this frame is A transmit antenna configuration with four may be shown.
- At least one of the reported Xi may be omitted.
- antenna coherency information may be called antenna coherency information, antenna coherency type, or the like.
- a UE that supports transmissions with more than four antenna ports may support more than four UL layers.
- a UE that supports 6 transmit antenna ports (which may be referred to as a 6TX UE) may support up to a certain number of layers (eg, 4/5/6) for UL.
- a UE that supports 8 transmit antenna ports (which may be referred to as an 8TX UE) may support up to a certain number of layers (eg, 4/5/6/7/8) for UL. good.
- a 6TX UE uses a specific number of (eg, 1/2/3/4/5/6) layer transmission precoding matrix table using 6 antenna ports as a precoding matrix table when the transform precoder is disabled. may be used.
- a 6TX UE may use a table of precoding matrices for at least one layer transmission using 6 antenna ports as a table of precoding matrices when the transform precoder is enabled.
- a 6TX UE may use a table of precoding matrices for 2-layer transmission using 6 antenna ports as a table of precoding matrices when the transform precoder is enabled.
- the 8TX UE uses 8 antenna ports as a table of precoding matrices when the transform precoder is disabled.
- a table of coding matrices may be used.
- An 8TX UE may use a table of precoding matrices for at least 1-layer transmission using 8 antenna ports as a table of precoding matrices when the transform precoder is enabled.
- An 8TX UE may use a table of precoding matrices for two-layer transmission using 8 antenna ports as a table of precoding matrices when the transform precoder is enabled.
- precoding matrix in the present disclosure may correspond to the TPMI index.
- table of precoding matrices (which may be called a codebook) may be different for each antenna coherency type.
- a UE that supports transmission with more than 4 antenna ports may report UE capability information indicating the maximum number of layers of UL transmission it supports.
- the UE may report UE capability information indicating whether it supports 2-layer UL transmission when transform precoder is enabled.
- the maximum number of ranks/layers may not be specified in the specification, which may mean up to M ranks/layers.
- Higher layer signaling may set that the number of ranks/layers is limited to N. N may depend on reported UE capability signaling.
- New precoding matrix table for transmission of 1/2/.../N layers using N or M antenna ports with transform precoding disabled for maximum number N of ranks/layers (precoding matrix corresponding to the number of layers and the value of TPMI index) may be defined in the specification.
- New precoding matrix table (TPMI index value ) may be defined in the specification.
- a new precoding matrix table (pre- coding matrix) may be defined in the specification.
- the transmission antenna configuration of the UE for supporting the number of layers greater than 4 can be appropriately reported to the network.
- the maximum number of ranks/layers may be limited by N.
- N may be set by higher layer signaling, limited by specifications, or reported by UE capabilities.
- a second embodiment relates to PUSCH transmission for UEs supporting a number of layers greater than 4 (eg, 6TX UEs, 8TX UEs).
- a PUSCH with a number of layers greater than 4 may be transmitted by a Transport Block (TB)/Code Word (CW).
- the DCI that schedules this PUSCH (eg, DCI format 0_1/0_2) may have at least one of the following fields with a size larger than the bit size of existing DCI fields: - SRS resource indicator field; - Precoding information field.
- the size of the SRS resource indicator field increases in the case of non-codebook-based PUSCH, and does not need to increase in the case of codebook-based PUSCH (that is, it may be 1 bit). .
- codebook-based PUSCH if there is no increase in the number of SRS resources in the SRS resource set (for example, the number of SRS resources configured in the SRS resource set is 2), one SRI for PUSCH. This is because it is sufficient if is indicated, and there is no need to increase the number of bits for SRI.
- new precoding and layer number tables for 6/8 antenna ports may be defined. This table may be associated with a table of precoding matrices.
- a new table for antenna ports may be defined for DMRS port indications with a number of layers greater than 4 layers. This will be explained in a fourth embodiment.
- the DCI has a set of fields including a Modulation and Coding Scheme (MCS) field, a New Data Indicator (NDI) field and a Redundancy Version (RV) field. Two may be included. This one set may correspond to one TB. In other words, the UE may be scheduled 2 TBs with a DCI containing 2 of this set.
- MCS Modulation and Coding Scheme
- NDI New Data Indicator
- RV Redundancy Version
- the third embodiment relates to the increased size SRS resource indicator field described in the second embodiment.
- Embodiment 3.1 When up to 6 or 8 1-port SRS resources are configured in 1 SRS resource set, - Embodiment 3.2: When up to 3 or 4 1-port SRS resources are configured in 1 SRS resource set.
- the SRS resource set in the third embodiment may be a non-codebook SRS resource set
- the PUSCH may be a non-codebook-based PUSCH.
- the base station may indicate up to 6 or 8 SRS resources to the UE by DCI.
- the size of the SRS resource indicator field included in the DCI may be represented by Equation 1 below.
- N SRS is the number of SRS resources configured in the SRS resource set whose usage is non-codebook
- L max is a higher layer parameter indicating the maximum MIMO layer used for PUSCH (for example, the RRC parameter "maxMIMO -Layers") or by the maximum number of layers for PUSCH supported by the UE for non-codebook-based operation.
- Equation 1 itself is described in Rel. The same is true for 15 NR.
- N SRS , L max , etc. are as described in Rel.
- 15 NR each had a value of 4 or less, whereas in embodiment 3.1 it may be 6 or 8, respectively, so the size of the SRS resource indicator field is reduced according to Rel. higher than that in 15 NR.
- the UE may be configured with two SRS resource sets, and each SRS resource set may contain up to 3 or 4 1-port SRS resources.
- the UE may receive DCI including two SRS resource indicator fields.
- the UE may assume that the DCI includes two SRS resource indicator fields if configured with "two SRS resources for non-codebook base”.
- the base station may indicate to the UE up to 3 or 4 SRS resources per SRS resource indicator field of the DCI.
- One SRS resource indicator field may correspond to one TB.
- one SRS resource indicator field indicates up to four SRS resources and another SRS resource indicator field indicates no SRS resources. may be indicated.
- the SRS resources specified by each SRS resource indicator field may be subject to certain restrictions.
- the number of SRS resources that can be specified by two SRS resource indicator fields is at least one of (3+2), (2+3), (3+3), (3+4), (4+3), (4+4), etc. good too.
- X + Y layer transmission based on designation of X + Y SRS resources using two SRS resource indicator fields shown in Embodiment 3.2 may mean
- a fourth embodiment relates to a table of antenna ports for DMRS port indication for a number of layers greater than 4 layers when the transform precoder is disabled.
- the UE determines the rank (number of layers) for PUSCH transmission based on the DCI precoding information field.
- the UE determines the rank (number of layers) for PUSCH transmission based on the SRS resource indicator field of DCI.
- the UE uses the table of antenna ports corresponding to the determined rank to enable/disable the transform precoder and the PUSCH DMRS type set by higher layer signaling (even if set by the RRC parameter "dmrs-Type"). ) and the value of the maximum DMRS length (which may be set by the RRC parameter “maxLength”).
- the table entry to be referenced (the entry corresponds to a set of CDM group number, DMRS antenna port index, number of front-load symbols, etc.) ) may be determined.
- FIG. 5A is an example of a table of antenna ports corresponding to rank 5.
- FIG. 5A different DMRS port sets (5 antenna ports) are associated with values of 0 to 3 in the antenna port field. Note that the correspondence relationship between the value and the content of the entry is not limited to this. Other examples are similar.
- 2+3 layers and 3+2 layers may be supported. Note that only some of the illustrated entries may be supported. For example, only entries for DMRS ports 0-4 may be supported for 2+3 layers, and only entries for DMRS ports 0, 1, 2, 3, 6 may be supported for 3+2 layers.
- FIG. 5B is an example of a table of antenna ports corresponding to rank 6.
- FIG. 5B different sets of DMRS ports (6 antenna ports) are associated with values of 0 to 2 in the antenna port field.
- FIG. 5C is an example of a table of antenna ports corresponding to rank 7.
- different sets of DMRS ports (the number of antenna ports is 7) are associated with values of 0 to 1 in the antenna port field.
- FIG. 5D is an example of a table of antenna ports corresponding to rank 8.
- FIG. 6A is an example of a table of antenna ports corresponding to rank 5.
- FIG. 6B is an example of a table of antenna ports corresponding to rank 6.
- FIG. 7A is an example of a table of antenna ports corresponding to Rank 5.
- FIG. 7A different DMRS port sets (5 antenna ports) are associated with values of 0 to 2 in the antenna port field.
- FIG. 7B is an example of a table of antenna ports corresponding to rank 6.
- FIG. 7B different sets of DMRS ports (6 antenna ports) are associated with values of 0 to 3 in the antenna port field.
- FIG. 7B 4+2 layers, 2+4 layers and 3+3 layers may be supported. Note that only certain X, Y combinations (eg, 3+3) for the X+Y layer may be supported. For example, only the entry corresponding to the value of 3 in the antenna port field of FIG. 7B may be supported for 3+3.
- FIG. 7C is an example of a table of antenna ports corresponding to rank 7.
- different DMRS port sets (7 antenna ports) are associated with values of 0 to 3 in the antenna port field.
- FIG. 7D is an example of a table of antenna ports corresponding to rank 8.
- a set of DMRS ports (8 antenna ports) is associated with values of 0 to 2 in the antenna port field.
- a higher layer parameter (RRC information element)/UE capability corresponding to at least one function (feature) in each embodiment may be defined.
- UE capabilities may indicate whether to support this feature.
- a UE for which a higher layer parameter corresponding to that function is set may perform that function. It may be defined that "UEs for which higher layer parameters corresponding to the function are not set shall not perform the function (eg, apply Rel. 15/16 operations)".
- a UE reporting UE capabilities indicating that it supports that function may perform that function. It may be specified that "a UE that does not report UE capabilities indicating that it supports the feature shall not perform the feature (e.g. apply Rel. 15/16 behavior)".
- a UE may perform a function if it reports a UE capability indicating that it supports the function, and the higher layer parameters corresponding to the function are configured. "If the UE does not report a UE capability indicating that it supports the function, or if the higher layer parameters corresponding to the function are not set, the UE does not perform the function (e.g., Rel. 15/16 'applying an action' may be defined.
- UE capabilities may indicate at least one of the following: - Information about at least one of M and N; For example, how many transmit antenna ports the UE supports (maximum number of transmit antenna ports M). For example, how many ranks/layers the UE supports (maximum number of ranks/layers M). M and N may be reported jointly. For example, combinations of M and N may be reported. Information about at least one of M and N may be reported separately for codebook-based and non-codebook-based UL transmissions, or for codebook-based and non-codebook-based UL transmissions. may be reported jointly to • Whether to support the new TPMI table for codebook MIMO. Up to how many SRS resources/SRS resource sets whose usage has codebook/non-codebook usage (maximum of SRS resources/SRS resource sets whose usage has codebook/non-codebook usage number).
- the UE can implement the above functions while maintaining compatibility with existing specifications.
- wireless communication system A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below.
- communication is performed using any one of the radio communication methods according to the above embodiments of the present disclosure or a combination thereof.
- FIG. 8 is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by the Third Generation Partnership Project (3GPP). .
- LTE Long Term Evolution
- 5G NR 5th generation mobile communication system New Radio
- 3GPP Third Generation Partnership Project
- the wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- RATs Radio Access Technologies
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)), etc.
- RATs Radio Access Technologies
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)), etc.
- LTE Evolved Universal Terrestrial Radio Access
- EN-DC E-UTRA-NR Dual Connectivity
- NE-DC NR-E -UTRA Dual Connectivity
- the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN).
- the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.
- the wireless communication system 1 has dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB) )) may be supported.
- dual connectivity NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB)
- gNB NR base stations
- a wireless communication system 1 includes a base station 11 forming a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) arranged in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. You may prepare.
- a user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and user terminals 20 are not limited to the embodiment shown in the figure.
- the base stations 11 and 12 are collectively referred to as the base station 10 when not distinguished.
- the user terminal 20 may connect to at least one of the multiple base stations 10 .
- the user terminal 20 may utilize at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)).
- Macrocell C1 may be included in FR1, and small cell C2 may be included in FR2.
- FR1 may be a frequency band below 6 GHz (sub-6 GHz)
- FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.
- the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- a plurality of base stations 10 may be connected by wire (for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
- wire for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) is an IAB Also called a node.
- IAB Integrated Access Backhaul
- relay station relay station
- the base station 10 may be connected to the core network 30 directly or via another base station 10 .
- the core network 30 may include, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), and the like.
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal compatible with at least one of communication schemes such as LTE, LTE-A, and 5G.
- a radio access scheme based on orthogonal frequency division multiplexing may be used.
- OFDM orthogonal frequency division multiplexing
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a radio access method may be called a waveform.
- other radio access schemes for example, other single-carrier transmission schemes and other multi-carrier transmission schemes
- the UL and DL radio access schemes may be used as the UL and DL radio access schemes.
- a downlink shared channel Physical Downlink Shared Channel (PDSCH)
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- PDCCH Physical Downlink Control Channel
- an uplink shared channel (PUSCH) shared by each user terminal 20 an uplink control channel (PUCCH), a random access channel (Physical Random Access Channel (PRACH)) or the like may be used.
- PUSCH uplink shared channel
- PUCCH uplink control channel
- PRACH Physical Random Access Channel
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by the PDSCH.
- User data, higher layer control information, and the like may be transmitted by PUSCH.
- a Master Information Block (MIB) may be transmitted by the PBCH.
- Lower layer control information may be transmitted by the PDCCH.
- the lower layer control information may include, for example, downlink control information (DCI) including scheduling information for at least one of PDSCH and PUSCH.
- DCI downlink control information
- the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc.
- the DCI that schedules PUSCH may be called UL grant, UL DCI, etc.
- PDSCH may be replaced with DL data
- PUSCH may be replaced with UL data.
- a control resource set (CControl Resource SET (CORESET)) and a search space (search space) may be used for PDCCH detection.
- CORESET corresponds to a resource searching for DCI.
- the search space corresponds to the search area and search method of PDCCH candidates.
- a CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with certain search spaces based on the search space settings.
- One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set. Note that “search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. in the present disclosure may be read interchangeably.
- PUCCH channel state information
- acknowledgment information for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.
- SR scheduling request
- a random access preamble for connection establishment with a cell may be transmitted by the PRACH.
- downlink, uplink, etc. may be expressed without adding "link”.
- various channels may be expressed without adding "Physical" to the head.
- synchronization signals SS
- downlink reference signals DL-RS
- the DL-RS includes a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DeModulation Reference Signal (DMRS)), Positioning Reference Signal (PRS)), Phase Tracking Reference Signal (PTRS)), etc.
- CRS cell-specific reference signal
- CSI-RS channel state information reference signal
- DMRS Demodulation reference signal
- PRS Positioning Reference Signal
- PTRS Phase Tracking Reference Signal
- the synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- a signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called SS/PBCH block, SS Block (SSB), and so on.
- SS, SSB, etc. may also be referred to as reference signals.
- DMRS may also be called a user terminal-specific reference signal (UE-specific reference signal).
- FIG. 9 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- the base station 10 comprises a control section 110 , a transmission/reception section 120 , a transmission/reception antenna 130 and a transmission line interface 140 .
- One or more of each of the control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission line interface 140 may be provided.
- this example mainly shows the functional blocks that characterize the present embodiment, and it may be assumed that the base station 10 also 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 controls the base station 10 as a whole.
- the control unit 110 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (eg, resource allocation, mapping), and the like.
- the control unit 110 may control transmission/reception, measurement, etc. using the transmission/reception unit 120 , the transmission/reception antenna 130 and the transmission line interface 140 .
- the control unit 110 may generate data to be transmitted as a signal, control information, a sequence, etc., and transfer them to the transmission/reception unit 120 .
- the control unit 110 may perform call processing (setup, release, etc.) of communication channels, state management of the base station 10, management of radio resources, and the like.
- the transmitting/receiving section 120 may include a baseband section 121 , a radio frequency (RF) section 122 and a measuring section 123 .
- the baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212 .
- the transmitting/receiving unit 120 is configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure. be able to.
- the transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of the transmission processing section 1211 and the RF section 122 .
- the receiving section may be composed of a reception processing section 1212 , an RF section 122 and a measurement section 123 .
- the transmitting/receiving antenna 130 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 120 may receive the above-described uplink channel, uplink reference signal, and the like.
- the transmitting/receiving unit 120 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 120 (transmission processing unit 1211) performs Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control for example, HARQ retransmission control
- the transmission/reception unit 120 (transmission processing unit 1211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (DFT) on the bit string to be transmitted. Processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, transmission processing such as digital-to-analog conversion may be performed, and the baseband signal may be output.
- channel coding which may include error correction coding
- modulation modulation
- mapping mapping
- filtering filtering
- DFT discrete Fourier transform
- DFT discrete Fourier transform
- the transmitting/receiving unit 120 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 130. .
- the transmitting/receiving unit 120 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 130.
- the transmission/reception unit 120 (reception processing unit 1212) performs analog-to-digital conversion, Fast Fourier transform (FFT) processing, and Inverse Discrete Fourier transform (IDFT) processing on the acquired baseband signal. )) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing. User data and the like may be acquired.
- FFT Fast Fourier transform
- IDFT Inverse Discrete Fourier transform
- the transmitting/receiving unit 120 may measure the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, etc. based on the received signal.
- the measurement unit 123 measures received power (for example, Reference Signal Received Power (RSRP)), reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)) , signal strength (for example, Received Signal Strength Indicator (RSSI)), channel information (for example, CSI), and the like may be measured.
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- RSSI Received Signal Strength Indicator
- channel information for example, CSI
- the transmission path interface 140 transmits and receives signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, etc., and user data (user plane data) for the user terminal 20, control plane data, and the like. Data and the like may be obtained, transmitted, and the like.
- the transmitter and receiver of the base station 10 in the present disclosure may be configured by at least one of the transmitter/receiver 120, the transmitter/receiver antenna 130, and the transmission line interface 140.
- the control unit 110 may determine the number M of antenna ports and the number N of layers less than M.
- the transceiver 120 may receive a physical uplink shared channel using N layers.
- FIG. 10 is a diagram illustrating an example of the configuration of a user terminal according to one embodiment.
- the user terminal 20 includes a control section 210 , a transmission/reception section 220 and a transmission/reception antenna 230 .
- One or more of each of the control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided.
- this example mainly shows the functional blocks of the features of the present embodiment, and it may be assumed that the user terminal 20 also 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 controls the user terminal 20 as a whole.
- the control unit 210 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 210 may control signal generation, mapping, and the like.
- the control unit 210 may control transmission/reception, measurement, etc. using the transmission/reception unit 220 and the transmission/reception antenna 230 .
- the control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission/reception unit 220 .
- the transmitting/receiving section 220 may include a baseband section 221 , an RF section 222 and a measurement section 223 .
- the baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212 .
- the transmitting/receiving unit 220 can be configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure.
- the transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of a transmission processing section 2211 and an RF section 222 .
- the receiving section may include a reception processing section 2212 , an RF section 222 and a measurement section 223 .
- the transmitting/receiving antenna 230 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 220 may transmit the above-described uplink channel, uplink reference signal, and the like.
- the transmitter/receiver 220 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- RLC layer processing for example, RLC retransmission control
- MAC layer processing for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control
- the transmitting/receiving unit 220 (transmission processing unit 2211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), and IFFT processing on a bit string to be transmitted. , precoding, digital-analog conversion, and other transmission processing may be performed, and the baseband signal may be output.
- Whether or not to apply the DFT process may be based on the settings of the transform precoder (precoding). Transmitting/receiving unit 220 (transmission processing unit 2211), for a certain channel (for example, PUSCH), if the transform precoder is enabled, the above to transmit the channel using the DFT-s-OFDM waveform
- the DFT process may be performed as the transmission process, or otherwise the DFT process may not be performed as the transmission process.
- the transmitting/receiving unit 220 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 230. .
- the transmitting/receiving section 220 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 230.
- the transmission/reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (error correction) on the acquired baseband signal. decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmitting/receiving section 220 may measure the received signal.
- the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal.
- the measuring unit 223 may measure received power (eg, RSRP), received quality (eg, RSRQ, SINR, SNR), signal strength (eg, RSSI), channel information (eg, CSI), and the like.
- the measurement result may be output to control section 210 .
- the transmitter and receiver of the user terminal 20 in the present disclosure may be configured by at least one of the transmitter/receiver 220 and the transmitter/receiver antenna 230 .
- the control unit 210 may determine the number M of antenna ports and the number N of layers less than M.
- the transmitting/receiving unit 220 may transmit physical uplink shared channels using N layers.
- the control unit 210 may report capability information regarding combinations of M and N.
- the control unit 210 may control reception of instruction information regarding a combination of M and N or N, and determine M and N based on the instruction information.
- the control unit 210 based on either information on N antenna port numbers among M antenna ports or information on sounding reference signal resources associated with the N antenna ports, N antenna ports may be determined.
- the transceiver 220 may transmit the physical uplink shared channel using the N antenna ports and the N layers.
- each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.
- a functional block may be implemented by combining software in the one device or the plurality of devices.
- function includes judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deem , broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (component) that performs transmission may be called a transmitting unit, a transmitter, or the like. In either case, as described above, the implementation method is not particularly limited.
- a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 11 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to one embodiment.
- the base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. .
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.
- processor 1001 may be implemented by one or more chips.
- predetermined software program
- the processor 1001 performs calculations, communication via the communication device 1004 and at least one of reading and writing data in the memory 1002 and the storage 1003 .
- the processor 1001 operates an operating system and controls the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like.
- CPU central processing unit
- control unit 110 210
- transmission/reception unit 120 220
- FIG. 10 FIG. 10
- the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them.
- programs program codes
- software modules software modules
- data etc.
- the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be similarly implemented.
- the memory 1002 is a computer-readable recording medium, such as Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or at least any other suitable storage medium. may be configured by one.
- the memory 1002 may also be called a register, cache, main memory (main storage device), or the like.
- the memory 1002 can store executable programs (program code), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also be called an auxiliary storage device.
- a computer-readable recording medium for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also
- the communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes a high-frequency switch, duplexer, filter, frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD), for example. may be configured to include
- the transmitting/receiving unit 120 (220), the transmitting/receiving antenna 130 (230), and the like described above may be realized by the communication device 1004.
- the transmitter/receiver 120 (220) may be physically or logically separated into a transmitter 120a (220a) and a receiver 120b (220b).
- the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
- Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses between devices.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. It may be configured including hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.
- DSP digital signal processor
- ASIC application specific integrated circuit
- PLD programmable logic device
- FPGA field programmable gate array
- a signal may also be a message.
- a reference signal may be abbreviated as RS, and may also be called a pilot, a pilot signal, etc., depending on the applicable standard.
- a component carrier may also be called a cell, a frequency carrier, a carrier frequency, or the like.
- a radio frame may consist of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) that make up a radio frame may be called a subframe.
- a subframe may consist of one or more slots in the time domain.
- a subframe may be a fixed time length (eg, 1 ms) independent of numerology.
- a numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel.
- Numerology for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration , a particular filtering process performed by the transceiver in the frequency domain, a particular windowing process performed by the transceiver in the time domain, and/or the like.
- a slot may consist of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may also be a unit of time based on numerology.
- a slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) transmitted in time units larger than a minislot may be referred to as PDSCH (PUSCH) Mapping Type A.
- PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.
- Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.
- one subframe may be called a TTI
- a plurality of consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum scheduling time unit in wireless communication.
- a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis.
- radio resources frequency bandwidth, transmission power, etc. that can be used by each user terminal
- a TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, or the like.
- a TTI that is shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
- the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms
- the short TTI e.g., shortened TTI, etc.
- a TTI having the above TTI length may be read instead.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain.
- the number of subcarriers included in the RB may be the same regardless of the neumerology, eg twelve.
- the number of subcarriers included in an RB may be determined based on neumerology.
- an RB may contain one or more symbols in the time domain and may be 1 slot, 1 minislot, 1 subframe or 1 TTI long.
- One TTI, one subframe, etc. may each be configured with one or more resource blocks.
- One or more RBs are Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB Also called a pair.
- PRB Physical Resource Block
- SCG Sub-Carrier Group
- REG Resource Element Group
- PRB pair RB Also called a pair.
- a resource block may be composed of one or more resource elements (Resource Element (RE)).
- RE resource elements
- 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
- a Bandwidth Part (which may also be called a bandwidth part) represents a subset of contiguous common resource blocks (RBs) for a numerology on a carrier.
- the common RB may be identified by an RB index based on the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP for UL
- BWP for DL DL BWP
- One or multiple BWPs may be configured for a UE within one carrier.
- At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given channel/signal outside the active BWP.
- BWP bitmap
- radio frames, subframes, slots, minislots, symbols, etc. described above are merely examples.
- the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers and the number of symbols in a TTI, symbol length, cyclic prefix (CP) length, etc. can be varied.
- the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indicated by a predetermined index.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of
- information, signals, etc. can be output from a higher layer to a lower layer and/or from a lower layer to a higher layer.
- Information, signals, etc. may be input and output through multiple network nodes.
- Input/output information, signals, etc. may be stored in a specific location (for example, memory), or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated or appended. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to other devices.
- Uplink Control Information (UCI) Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may also be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like.
- RRC signaling may also be called an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.
- MAC signaling may be notified using, for example, a MAC Control Element (CE).
- CE MAC Control Element
- notification of predetermined information is not limited to explicit notification, but implicit notification (for example, by not notifying the predetermined information or by providing another information by notice of
- the determination may be made by a value (0 or 1) represented by 1 bit, or by a boolean value represented by true or false. , may be performed by numerical comparison (eg, comparison with a predetermined value).
- Software whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) , a server, or other remote source, these wired and/or wireless technologies are included within the definition of transmission media.
- a “network” may refer to devices (eg, base stations) included in a network.
- precoding "precoding weight”
- QCL Quality of Co-Location
- TCI state Transmission Configuration Indication state
- spatialal patial relation
- spatialal domain filter "transmission power”
- phase rotation "antenna port
- antenna port group "layer”
- number of layers Terms such as “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, “panel” are interchangeable. can be used as intended.
- base station BS
- radio base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission Point (TP)”, “Reception Point (RP)”, “Transmission/Reception Point (TRP)”, “Panel”
- a base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.
- a base station can accommodate one or more (eg, three) cells.
- the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is assigned to a base station subsystem (e.g., a small indoor base station (Remote Radio)). Head (RRH))) may also provide communication services.
- a base station subsystem e.g., a small indoor base station (Remote Radio)). Head (RRH)
- RRH Head
- the terms "cell” or “sector” refer to part or all of the coverage area of at least one of the base stations and base station subsystems that serve communication within such coverage.
- MS Mobile Station
- UE User Equipment
- Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , a handset, a user agent, a mobile client, a client, or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like.
- the mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ).
- at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.
- at least one of the base station and mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read as a user terminal.
- communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.)
- the user terminal 20 may have the functions of the base station 10 described above.
- words such as "uplink” and “downlink” may be replaced with words corresponding to communication between terminals (for example, "sidelink”).
- uplink channels, downlink channels, etc. may be read as sidelink channels.
- user terminals in the present disclosure may be read as base stations.
- the base station 10 may have the functions of the user terminal 20 described above.
- operations that are assumed to be performed by the base station may be performed by its upper node in some cases.
- various operations performed for communication with a terminal may involve the base station, one or more network nodes other than the base station (e.g., Clearly, this can be done by a Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. (but not limited to these) or a combination thereof.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching along with execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG xG (xG (x is, for example, an integer or a decimal number)
- Future Radio Access FAA
- RAT New - Radio Access Technology
- NR New Radio
- NX New radio access
- FX Future generation radio access
- GSM registered trademark
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi®
- IEEE 802.16 WiMAX®
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth®, or other suitable wireless It may be applied to systems using communication methods, next-generation systems extended based on these, and the like. Also, multiple systems may be applied to systems using communication methods, next-generation systems extended based on these, and the like
- any reference to elements using the "first,” “second,” etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.
- determining includes judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry ( For example, looking up in a table, database, or another data structure), ascertaining, etc. may be considered to be “determining.”
- determining (deciding) includes receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access ( accessing (e.g., accessing data in memory), etc.
- determining is considered to be “determining” resolving, selecting, choosing, establishing, comparing, etc. good too. That is, “determining (determining)” may be regarded as “determining (determining)” some action.
- connection refers to any connection or coupling, direct or indirect, between two or more elements. and can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other. Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection” may be read as "access”.
- radio frequency domain when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, radio frequency domain, microwave They can be considered to be “connected” or “coupled” together using the domain, electromagnetic energy having wavelengths in the optical (both visible and invisible) domain, and the like.
- a and B are different may mean “A and B are different from each other.”
- the term may also mean that "A and B are different from C”.
- Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Rel.15 NRにおいて、UEは、測定用参照信号(例えば、サウンディング参照信号(Sounding Reference Signal(SRS)))の送信に用いられる情報(SRS設定情報、例えば、RRC制御要素の「SRS-Config」内のパラメータ)を受信してもよい。
Rel.15 NRでは、4レイヤ/ランクまでの上りリンク(Uplink(UL))Multi Input Multi Output(MIMO)送信がサポートされる。将来のNRについて、より高いスペクトル効率を実現するために、4より大きいレイヤ数のUL送信をサポートすることが検討されている。
M個のアンテナポート(送信アンテナ)を有するUEに対し、ランク/MIMOレイヤの最大数はNに制限されてもよい。
・より大きい性能ゲイン。
・より簡単な仕様。例えば、M=8のケースにおいて、N=4に対する5/6/7/8レイヤ、又は、N=6に対する/7/8レイヤ、をどのように指示/設定するかを規定する必要がない。
・より小さいDCIオーバーヘッド。コードブックベースのUL MIMOにおけるTPMI用のDCIフィールドの必要数(最大数、ビット数、サイズ)と、ノンコードブックベースのUL MIMOのためのSRIフィールドの必要数(最大数、ビット数、サイズ)と、を削減できる。
与えられたMに対し、Nの値、又は、サポートされるレイヤ/ランクの数が、仕様によって規定される。図1Aの例において、送信アンテナ数M=1に対し、レイヤ/ランクの数1がサポートされる。送信アンテナ数M=2に対し、レイヤ/ランクの数1、2がサポートされる。送信アンテナ数M=4に対し、レイヤ/ランクの数1、2、3、4がサポートされる。送信アンテナ数M=8に対し、レイヤ/ランクの数1、2、3、4、5、6がサポートされる。
仕様において、Nの制限が無いこと(NがMに等しいこと)がサポートされてもよい。上位レイヤシグナリングがNの値を制限してもよい。送信アンテナ数M毎に、Nの(異なる)値が設定されてもよい。図1Bの例において、送信アンテナ数M=1に対し、レイヤ/ランクの最大数Nは設定されず、N=M=1であることを意味する。送信アンテナ数M=2に対し、レイヤ/ランクの最大数Nは設定されず、N=M=2であることを意味する。送信アンテナ数M=4に対し、レイヤ/ランクの最大数Nは設定されず、N=M=4であることを意味する。送信アンテナ数M=8に対し、レイヤ/ランクの最大数Nは6に設定される。
N<Mである場合、UEは、以下の送信アンテナ使用方法1及び2のいずれかに従って、送信アンテナを使用してもよい。
UEはM個の送信アンテナの全てを使用するが、最大ランクはNに制限される。図2Aの例において、送信アンテナ数M=8であり、8個の送信アンテナの全てが使用され、N=6個までのレイヤ/ランクが使用される。
UEは、M個の送信アンテナの内のN個の送信アンテナを選択し、N個の送信アンテナの全ての使用し、最大ランクはNである。図2Bの例において、送信アンテナ数M=8であり、最大ランクN=6である。N=6個の送信アンテナの全てが使用され、6個までのレイヤ/ランクが使用される。
送信アンテナ使用方法2に基づき、PUSCH送信に用いられる送信アンテナポートの選択が指示される場合、UEは、以下の送信アンテナ指示方法1から3のいずれかに従って、使用する送信アンテナを指示されてもよい。
指示は、送信アンテナポート毎に使用されるか否かを示してもよい。例えば、指示は、ビットマップであってもよい。ビットマップは、M個のビットを有してもよい。M個のビットが、M個の送信アンテナポートにそれぞれ対応してもよい。各ビットの値は、対応するアンテナポートが使用される場合に1であってもよい。送信アンテナポート数の増加に伴って、シグナリングのオーバーヘッドが大きくなる。指示は、DCI/MAC CE/RRC IEであってもよい。
RRC IE/MAC CEによって、送信アンテナポートの複数候補が指示/設定され、DCIによって複数候補の1つが選択されてもよい。図3Aの例において、送信アンテナポートの複数候補の組み合わせ(セット、グループ、リスト)に対してインデックスが関連付けられる。RRC IE/MAC CEによって複数候補が設定/指示されてもよい。複数候補とインデックスの関係が仕様に規定され、RRC IE/MAC CEによってインデックスが設定/指示されてもよい。
PUSCHの送信アンテナポートが、SRSの送信アンテナポートに関連付けられる。UEは、送信アンテナポートの異なる組み合わせを用いて、複数時間リソースにおいてSRSリソースを送信する。ネットワークがPUSCHをスケジュールする場合、ネットワークは、どのSRSリソースインデックスのアンテナポートがPUSCHに用いられるかを指示する。PUSCHの空間関係指示のためのビーム管理の用途を有するSRSと同様の仕組みが用いられてもよい。
第1の実施形態は、4より大きいレイヤ数をサポートするためのUEの送信アンテナ構成に関する。
UEは、4より大きいアンテナポート数の送信をサポートすることを示すUE能力情報(UE capability information)をネットワークに報告してもよい。当該UE能力情報は、送信アンテナ構成に関するUE能力情報と呼ばれてもよい。送信アンテナ構成に関するUE能力情報は、UEがサポートする送信アンテナポート数(例えば、6、8など)に関する情報を含んでもよいし、UEがサポートするコードブックベースPUSCH/ノンコードブックベースPUSCHのための最大レイヤ数に関する情報を含んでもよい。
4より大きいアンテナポート数の送信をサポートするUEは、4より大きいULレイヤ数をサポートしてもよい。例えば、6送信アンテナポートをサポートするUE(6TX UEと呼ばれてもよい)は、ULのために特定の数(例えば、4/5/6)のレイヤまでをサポートしてもよい。例えば、8送信アンテナポートをサポートするUE(8TX UEと呼ばれてもよい)は、ULのために特定の数(例えば、4/5/6/7/8)のレイヤまでをサポートしてもよい。
M個の送信アンテナポートを用いる送信をサポートするUEに対し、コードブックMIMO(コードブックベースUL送信、コードブックベースPUSCH)におけるランク/レイヤの最大数Nは、以下の制限方法1又は2のいずれかに従ってもよい。
ランク/レイヤの最大数Nが、仕様に規定される。
ランク/レイヤの最大数が仕様に規定されなくてもよいし、それが最大でM個のランク/レイヤを意味してもよい。上位レイヤシグナリングは、ランク/レイヤの数がNに制限されることを設定してもよい。Nは、報告されたUE能力シグナリングに依存してもよい。
第2の実施形態は、4より大きいレイヤ数をサポートするUE(例えば、6TX UE、8TX UE)のPUSCH送信に関する。
・SRSリソースインディケーターフィールド、
・プリコーディング情報フィールド。
第3の実施形態は、第2の実施形態で説明した、サイズが増加したSRSリソースインディケーターフィールドに関する。
・実施形態3.1:1SRSリソースセットに6又は8つまでの1ポートSRSリソースを設定される場合、
・実施形態3.2:1SRSリソースセットに3又は4つまでの1ポートSRSリソースを設定される場合。
UEによってSRS送信が行われた後、基地局は、DCIによって6又は8SRSリソースまでを当該UEに指示してもよい。当該DCIに含まれるSRSリソースインディケーターフィールドのサイズは、以下の式1によって表されてもよい。
実施形態3.2では、UEは、2つのSRSリソースセットを設定されてもよく、各SRSリソースセットは、3又は4つまでの1ポートSRSリソースを含んでもよい。
第4の実施形態は、トランスフォームプリコーダが無効な場合の、4レイヤより大きいレイヤ数のDMRSポート指示のためのアンテナポートのテーブルに関する。
DMRSタイプ=1、DMRSの最大長=1の場合には、ランク4までの送信がサポートされてもよい。言い換えると、DMRSタイプ=1及びDMRSの最大長=1を設定されるUEは、ランク4より大きい送信をサポートしない。
DMRSタイプ=1、DMRSの最大長=2の場合には、ランク8までの送信がサポートされてもよい。
DMRSタイプ=2、DMRSの最大長=1の場合には、ランク6までの送信がサポートされてもよいし、ランク4までの送信だけがサポートされてもよいし、ランク6(例えば、4+2レイヤ)の送信はサポートされずランク5までの送信だけがサポートされてもよい。
DMRSタイプ=2、DMRSの最大長=2の場合には、ランク8までの送信がサポートされてもよい。
各実施形態における少なくとも1つの機能(特徴、feature)に対応する上位レイヤパラメータ(RRC情報要素)/UE能力(capability)が規定されてもよい。UE能力は、この機能をサポートするか否かを示してもよい。
・M及びNの少なくとも1つに関する情報。例えば、UEが幾つまでの送信アンテナポートをサポートするか(送信アンテナポートの最大数M)。例えば、UEが幾つまでのランク/レイヤをサポートするか(ランク/レイヤの最大数M)。M及びNは合同で(jointly)報告されてもよい。例えば、M及びNの組み合わせが報告されてもよい。M及びNの少なくとも1つに関する情報は、コードブックベースUL送信及びノンコードブックベースUL送信に対して別々に(separatly)報告されてもよいし、コードブックベースUL送信及びノンコードブックベースUL送信に対して合同で報告されてもよい。
・コードブックMIMO用の新規TPMIテーブルをサポートするか否か。
・用途がコードブック/ノンコードブックの用途を有するSRSリソース/SRSリソースセットを、UEが幾つかまでサポートするか(用途がコードブック/ノンコードブックの用途を有するSRSリソース/SRSリソースセットの最大数)。
以下、本開示の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本開示の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図9は、一実施形態に係る基地局の構成の一例を示す図である。基地局10は、制御部110、送受信部120、送受信アンテナ130及び伝送路インターフェース(transmission line interface)140を備えている。なお、制御部110、送受信部120及び送受信アンテナ130及び伝送路インターフェース140は、それぞれ1つ以上が備えられてもよい。
図10は、一実施形態に係るユーザ端末の構成の一例を示す図である。ユーザ端末20は、制御部210、送受信部220及び送受信アンテナ230を備えている。なお、制御部210、送受信部220及び送受信アンテナ230は、それぞれ1つ以上が備えられてもよい。
なお、上記実施形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及びソフトウェアの少なくとも一方の任意の組み合わせによって実現される。また、各機能ブロックの実現方法は特に限定されない。すなわち、各機能ブロックは、物理的又は論理的に結合した1つの装置を用いて実現されてもよいし、物理的又は論理的に分離した2つ以上の装置を直接的又は間接的に(例えば、有線、無線などを用いて)接続し、これら複数の装置を用いて実現されてもよい。機能ブロックは、上記1つの装置又は上記複数の装置にソフトウェアを組み合わせて実現されてもよい。
なお、本開示において説明した用語及び本開示の理解に必要な用語については、同一の又は類似する意味を有する用語と置き換えてもよい。例えば、チャネル、シンボル及び信号(シグナル又はシグナリング)は、互いに読み替えられてもよい。また、信号はメッセージであってもよい。参照信号(reference signal)は、RSと略称することもでき、適用される標準によってパイロット(Pilot)、パイロット信号などと呼ばれてもよい。また、コンポーネントキャリア(Component Carrier(CC))は、セル、周波数キャリア、キャリア周波数などと呼ばれてもよい。
Claims (6)
- アンテナポート数Mと、Mよりも少ないレイヤ数Nと、を決定する制御部と、
N個のレイヤを用いて物理上りリンク共有チャネルを送信する送信部と、を有する端末。 - 前記制御部は、M及びNの組み合わせに関する能力情報を報告する、請求項1に記載の端末。
- 前記制御部は、M及びNの組み合わせ又はNに関する指示情報の受信を制御し、前記指示情報に基づいてM及びNを決定する、請求項1又は請求項2に記載の端末。
- 前記制御部は、M個のアンテナポートの内のN個のアンテナポートに関する情報と、前記N個のアンテナポートに関連付けられたサウンディング参照信号リソースに関する情報と、のいずれかに基づいて、前記N個のアンテナポートを決定し、
前記送信部は、前記N個のアンテナポート及び前記N個のレイヤを用いて前記物理上りリンク共有チャネルを送信する、請求項1から請求項3のいずれかに記載の端末。 - アンテナポート数Mと、Mよりも少ないレイヤ数Nと、を決定するステップと、
N個のレイヤを用いて物理上りリンク共有チャネルを送信するステップと、を有する、端末の無線通信方法。 - アンテナポート数Mと、Mよりも少ないレイヤ数Nと、を決定する制御部と、
N個のレイヤを用いる物理上りリンク共有チャネルを受信する受信部と、を有する基地局。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2021/016544 WO2022224457A1 (ja) | 2021-04-23 | 2021-04-23 | 端末、無線通信方法及び基地局 |
CN202180099770.4A CN117546503A (zh) | 2021-04-23 | 2021-04-23 | 终端、无线通信方法以及基站 |
JP2023516018A JPWO2022224457A1 (ja) | 2021-04-23 | 2021-04-23 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2021/016544 WO2022224457A1 (ja) | 2021-04-23 | 2021-04-23 | 端末、無線通信方法及び基地局 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022224457A1 true WO2022224457A1 (ja) | 2022-10-27 |
Family
ID=83722219
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2021/016544 WO2022224457A1 (ja) | 2021-04-23 | 2021-04-23 | 端末、無線通信方法及び基地局 |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPWO2022224457A1 (ja) |
CN (1) | CN117546503A (ja) |
WO (1) | WO2022224457A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011029743A (ja) * | 2009-07-22 | 2011-02-10 | Sharp Corp | 無線通信システム、基地局装置および移動局装置 |
WO2019130506A1 (ja) * | 2017-12-27 | 2019-07-04 | 株式会社Nttドコモ | ユーザ端末及び無線通信方法 |
JP2020507965A (ja) * | 2017-12-01 | 2020-03-12 | エルジー エレクトロニクス インコーポレイティド | 無線通信システムにおける上向きリンク送受信方法及びこのための装置 |
-
2021
- 2021-04-23 JP JP2023516018A patent/JPWO2022224457A1/ja active Pending
- 2021-04-23 WO PCT/JP2021/016544 patent/WO2022224457A1/ja active Application Filing
- 2021-04-23 CN CN202180099770.4A patent/CN117546503A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011029743A (ja) * | 2009-07-22 | 2011-02-10 | Sharp Corp | 無線通信システム、基地局装置および移動局装置 |
JP2020507965A (ja) * | 2017-12-01 | 2020-03-12 | エルジー エレクトロニクス インコーポレイティド | 無線通信システムにおける上向きリンク送受信方法及びこのための装置 |
WO2019130506A1 (ja) * | 2017-12-27 | 2019-07-04 | 株式会社Nttドコモ | ユーザ端末及び無線通信方法 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2022224457A1 (ja) | 2022-10-27 |
CN117546503A (zh) | 2024-02-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP7238107B2 (ja) | 端末、無線通信方法及びシステム | |
JP7264921B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
JP7234262B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
JP7293247B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
JP7252251B2 (ja) | 端末、無線通信方法及びシステム | |
JP7244633B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
WO2022153395A1 (ja) | 端末、無線通信方法及び基地局 | |
JP7230059B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
JP7337913B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
WO2022244491A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2021161451A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2021156951A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2020194743A1 (ja) | ユーザ端末及び無線通信方法 | |
WO2022224457A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2023281680A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2023281676A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2023281675A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2023007670A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2022244492A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2023013023A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2022244493A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2023002610A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2023002609A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2023002611A1 (ja) | 端末、無線通信方法及び基地局 | |
WO2022239111A1 (ja) | 端末、無線通信方法及び基地局 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21937948 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2023516018 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 18556789 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202180099770.4 Country of ref document: CN |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 21937948 Country of ref document: EP Kind code of ref document: A1 |