WO2024171373A1 - 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
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- WO2024171373A1 WO2024171373A1 PCT/JP2023/005465 JP2023005465W WO2024171373A1 WO 2024171373 A1 WO2024171373 A1 WO 2024171373A1 JP 2023005465 W JP2023005465 W JP 2023005465W WO 2024171373 A1 WO2024171373 A1 WO 2024171373A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
- H04B7/06952—Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping
Definitions
- This disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- UMTS Universal Mobile Telecommunications System
- Non-Patent Document 1 LTE-Advanced (3GPP Rel. 10-14) was specified for the purpose of achieving higher capacity and greater sophistication over LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).
- LTE 5th generation mobile communication system
- 5G+ 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- NR future wireless communication systems
- user terminals terminals, user terminals, User Equipment (UE)
- QCL quasi-co-location
- TCI Transmission Configuration Indication
- one of the objectives of this disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately applies the TCI state.
- a terminal is characterized in that it has a receiving unit that receives at least one of a downlink (DL) channel and a DL reference signal that are scheduled or triggered by downlink control information (DCI), and a control unit that determines an indicated transmission configuration indication (TCI state) to be applied to the reception of the DL channel or the DL reference signal based on a unified TCI state indicated by a specific field included in the DCI.
- DCI downlink control information
- TCI state transmission configuration indication
- the TCI state can be appropriately applied.
- FIG. 1A and 1B show an example of a unified/common TCI framework.
- 2A and 2B show an example of DCI-based TCI status indication.
- FIG. 3 shows an example of application times for the Unified TCI Status Indication.
- 4A to 4D are diagrams showing an example of a multi-TRP.
- 5A-5C are diagrams illustrating an example of application of an indicated TCI state.
- FIG. 6 is a diagram showing an example of a case in which a UE cannot determine a CORESET (or DCI) that is a scheduling target for a PDSCH.
- 7A-7C are diagrams illustrating an example of application of an indicated TCI state according to the first embodiment.
- FIG. 8 is a diagram illustrating application of an indicated TCI state according to a modification of the first embodiment.
- FIG. 9 is a diagram illustrating an example of an SRS resource set indicator according to the second embodiment.
- FIG. 10 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 11 is a diagram illustrating an example of the configuration of a base station according to an embodiment.
- FIG. 12 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment.
- FIG. 13 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment.
- FIG. 14 is a diagram illustrating an example of a vehicle according to an embodiment.
- TCI transmission configuration indication state
- the TCI state may represent that which applies to the downlink signal/channel.
- the equivalent of the TCI state which applies to the uplink signal/channel may be expressed as a spatial relation.
- TCI state is information about the Quasi-Co-Location (QCL) of signals/channels and may also be called spatial reception parameters, spatial relation information, etc. TCI state may be set in the UE on a per channel or per signal basis.
- QCL Quasi-Co-Location
- QCL is an index that indicates the statistical properties of a signal/channel. For example, if a signal/channel has a QCL relationship with another signal/channel, it may mean that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameters (e.g., spatial Rx parameters) is identical between these different signals/channels (i.e., it is QCL with respect to at least one of these).
- spatial parameters e.g., spatial Rx parameters
- the spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be identified based on a spatial QCL.
- the QCL (or at least one element of the QCL) in this disclosure may be interpreted as sQCL (spatial QCL).
- QCL types Multiple types of QCLs (QCL types) may be defined. For example, four QCL types A-D may be provided, each of which has different parameters (or parameter sets) that can be assumed to be the same.
- the UE's assumption that a Control Resource Set (CORESET), channel or reference signal is in a particular QCL (e.g., QCL type D) relationship with another CORESET, channel or reference signal may be referred to as a QCL assumption.
- CORESET Control Resource Set
- QCL QCL type D
- the UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal/channel based on the TCI condition or QCL assumption of the signal/channel.
- Tx beam transmit beam
- Rx beam receive beam
- the TCI state may be, for example, information regarding the QCL between the target channel (in other words, the reference signal (RS) for that channel) and another signal (e.g., another RS).
- the TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination of these.
- the physical layer signaling may be, for example, Downlink Control Information (DCI).
- DCI Downlink Control Information
- the channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of the downlink shared channel (Physical Downlink Shared Channel (PDSCH)), the downlink control channel (Physical Downlink Control Channel (PDCCH)), the uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and the uplink control channel (Physical Uplink Control Channel (PUCCH)).
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Downlink Control Channel
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).
- SSB synchronization signal block
- CSI-RS channel state information reference signal
- SRS sounding reference signal
- TRS tracking CSI-RS
- QRS QCL detection reference signal
- An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- PBCH Physical Broadcast Channel
- An SSB may also be referred to as an SS/PBCH block.
- An RS of QCL type X in a TCI state may refer to an RS that has a QCL type X relationship with a certain channel/signal (DMRS), and this RS may be called a QCL source of QCL type X in that TCI state.
- DMRS channel/signal
- a UE can configure a list of up to M TCI-State settings in the higher layer parameter PDSCH-Config for decoding of PDSCH according to a detected PDCCH with DCI intended for the UE and a given serving cell, where M depends on the UE capability maxNumberConfiguredTCIstatesPerCC.
- Each TCI-State includes parameters for setting the QCL relationship between one or two downlink reference signals and the DMRS port of the PDSCH, the DMRS port of the PDCCH, or the CSI-RS port of the CSI-RS resource.
- the QCL relationship is set by the higher layer parameters qcl-Type1 for the first DL RS and qcl-Type2 for the second DL RS (if configured).
- the QCL type corresponding to each DL RS is given by the higher layer parameter qcl-Type in QCL-Info and can take one of the following values: - 'typeA': ⁇ Doppler shift, Doppler spread, average delay, delay spread ⁇ - 'typeB': ⁇ Doppler shift, Doppler spread ⁇ - 'typeC': ⁇ Doppler shift, average delay ⁇ - 'typeD': ⁇ Spatial Rx parameter ⁇
- a TCI-State associates one or two DL Reference Signals (RS) with a corresponding QCL type. If an additional physical cell identifier (PCI) is configured for that RS, it is set to the same value for both DL RSs.
- PCI physical cell identifier
- the PDSCH may be scheduled in a DCI with a TCI field.
- the TCI state for the PDSCH is indicated by the TCI field.
- the TCI field of DCI format 1_1 is 3 bits, and the TCI field of DCI format 1_2 is up to 3 bits.
- the UE In RRC connected mode, if the TCI information element in the first DCI (higher layer parameter tci-PresentInDCI) is set to "enabled" for a CORESET that schedules a PDSCH, the UE assumes that the TCI field is present in DCI format 1_1 of the PDCCH transmitted in that CORESET.
- the TCI information element in the first DCI higher layer parameter tci-PresentInDCI
- the UE assumes that a TCI field with the DCI field size indicated in the TCI information element in the second DCI is present in DCI format 1_2 of the PDSCH transmitted in that CORESET.
- PDSCH may be scheduled with a DCI without a TCI field.
- the DCI format of the DCI may be DCI format 1_0 or DCI format 1_1/1_2 in case the TCI information element in the DCI (higher layer parameters tci-PresentInDCI or tci-PresentInDCI-1-2) is not set (enabled).
- the UE assumes that the TCI state or QCL assumption for the PDSCH is the same as the TCI state or QCL assumption (default TCI state) of the CORESET (e.g., scheduling DCI).
- the TCI state of the PDSCH (default TCI state) may be the TCI state of the lowest CORESET ID in the latest slot in the active DL BWP of that CC (of a particular UL signal). Otherwise, the TCI state of the PDSCH (default TCI state) may be the TCI state of the lowest TCI state ID of the PDSCH in the active DL BWP of the scheduled CC.
- At least one of the MAC CE for activation/deactivation of the PUCCH spatial relationship and the MAC CE for activation/deactivation of the SRS spatial relationship may not be used.
- the default assumptions of the spatial relationship and the PL-RS for the PUCCH are applied. If neither the spatial relationship nor the PL-RS for the SRS (SRS resource for the SRS, or SRS resource corresponding to the SRI in DCI format 0_1 that schedules the PUSCH) is configured in FR2 (applicable condition, second condition), the default assumptions of the spatial relationship and the PL-RS for the PUSCH and the SRS scheduled by DCI format 0_1 (default spatial relationship and default PL-RS) are applied.
- the default spatial relationship and default PL-RS may be the TCI state or QCL assumption of the CORESET with the lowest CORESET ID in that active DL BWP. If a CORESET is not configured in the active DL BWP on that CC, the default spatial relationship and default PL-RS may be the active TCI state with the lowest ID of the PDSCH in that active DL BWP.
- the spatial relationship of PUCCH scheduled by DCI format 0_0 follows the spatial relationship of the PUCCH resource with the lowest PUCCH resource ID among the active spatial relationships of PUCCH on the same CC.
- the network needs to update the PUCCH spatial relationship on all SCells even if no PUCCH is transmitted on the SCell.
- PUCCH configuration is not required for PUSCH scheduled by DCI format 0_0. If there is no active PUCCH spatial relationship or no PUCCH resources on the active UL BWP in a CC for PUSCH scheduled by DCI format 0_0 (applicable condition, second condition), the default spatial relationship and default PL-RS are applied to the PUSCH.
- the conditions for applying the default spatial relationship/default PL-RS for SRS may include setting the default beam path loss enable information element for SRS (upper layer parameter enableDefaultBeamPlForSRS) to be enabled.
- the conditions for applying the default spatial relationship/default PL-RS for PUCCH may include setting the default beam path loss enable information element for PUCCH (upper layer parameter enableDefaultBeamPlForPUCCH) to be enabled.
- the conditions for applying the default spatial relationship/default PL-RS for PUSCH scheduled by DCI format 0_0 may include setting the default beam path loss enable information element for PUSCH scheduled by DCI format 0_0 (upper layer parameter enableDefaultBeamPlForPUSCH0_0) to be enabled.
- the UE applies the default spatial relationship/PL-RS.
- the above threshold may be referred to as time duration for QCL, “timeDurationForQCL”, “Threshold”, “Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI”, “Threshold-Sched-Offset”, “beamSwitchTiming”, schedule offset threshold, scheduling offset threshold, etc.
- the above threshold may be reported by the UE as UE capability (per subcarrier interval).
- the UE assumes that the DMRS port of the PDSCH or PDSCH transmission occasion of the serving cell is QCL-co-located (quasi co-located) with the RS for QCL parameters associated with the two TCI states corresponding to the lowest code point among the TCI code points containing two different TCI states (two default QCL assumption decision rule).
- the 2 default TCI enable information element indicates that Rel. 16 operation of the 2 default TCI states for the PDSCH is enabled when at least one TCI codepoint is mapped to the 2 T
- the default TCI state for PDSCH in Rel. 15/16 is specified as a default TCI state for a single TRP, a default TCI state for multiple TRPs based on multiple DCIs, and a default TCI state for multiple TRPs based on a single DCI.
- the default TCI state for aperiodic CSI-RS (A (aperiodic)-CSI-RS) is specified as follows: default TCI state for single TRP, default TCI state for multi-TRP based on multi-DCI, and default TCI state for multi-TRP based on single DCI.
- the unified TCI framework does not specify the TCI state or spatial relationship for each channel as in Rel. 15, but instead specifies a common beam (common TCI state) and may apply it to all UL and DL channels, or a common beam for UL may apply to all UL channels and a common beam for DL may apply to all DL channels.
- a common beam common TCI state
- One common beam for both DL and UL, or one common beam for DL and one common beam for UL (total of two common beams) are being considered.
- the UE may assume the same TCI state for UL and DL (joint TCI state, joint TCI pool, joint common TCI pool, joint TCI state set).
- the UE may assume different TCI states for UL and DL respectively (separate TCI state, separate TCI pool, UL separate TCI pool and DL separate TCI pool, separate common TCI pool, UL common TCI pool and DL common TCI pool).
- the UL and DL default beams may be aligned via MAC CE based beam management (MAC CE level beam instructions).
- the PDSCH default TCI state may be updated to match the default UL beam (spatial relationship).
- DCI based beam management may indicate a common beam/unified TCI state from the same TCI pool (joint common TCI pool, joint TCI pool, set) for both UL and DL.
- X (>1) TCI states may be activated by the MAC CE.
- the UL/DL DCI may select one out of the X active TCI states.
- the selected TCI state may be applied to both UL and DL channels/RS.
- the TCI pool (set) may be multiple TCI states set by RRC parameters, or multiple TCI states (active TCI states, active TCI pool, set) activated by the MAC CE among multiple TCI states set by RRC parameters.
- Each TCI state may be a QCL type A/D RS.
- SSB, CSI-RS, or SRS may be set as the QCL type A/D RS.
- the number of TCI states corresponding to each of one or more TRPs may be specified.
- the number N ( ⁇ 1) of TCI states (UL TCI states) applied to UL channels/RS and the number M ( ⁇ 1) of TCI states (DL TCI states) applied to DL channels/RS may be specified.
- At least one of N and M may be notified/configured/instructed to the UE via higher layer signaling/physical layer signaling.
- this may mean that one UL TCI state and one DL TCI state for a single TRP are notified/configured/instructed separately to the UE (separate TCI states for a single TRP).
- this may mean that multiple (two) UL TCI states and multiple (two) DL TCI states for multiple (two) TRPs are notified/configured/instructed to the UE (separate TCI states for multiple TRPs).
- N and M are 1 or 2, but the values of N and M may be 3 or more, and N and M may be different.
- it may be supported to indicate one common beam (e.g., a common beam) by RRC/MAC CE/DCI, and the one common beam may be applied to multiple DL/UL channels/reference signals.
- Other cases may be supported in Rel. 18 and later.
- FIG. 1A and 1B show an example of a unified TCI framework.
- FIG. 1A shows an example of a joint DL/UL TCI state
- FIG. 1B shows an example of a separate TCI state.
- RRC parameters configure multiple TCI states for both DL and UL.
- the TCI states configured by the RRC parameters may be referred to as configured TCI states or configured TCI states.
- the MAC CE may activate multiple TCI states of the configured TCI states.
- the DCI may indicate one of the activated TCI states.
- the TCI state indicated by the DCI may be referred to as indicated TCI state or indicated TCI state.
- the DCI may be a UL DCI (e.g., a DCI used for scheduling PUSCH) or a DL DCI (e.g., a DCI used for scheduling PDSCH).
- the indicated TCI state may apply to at least one (or all) of the UL/DL channels/RS.
- One DCI may indicate both UL TCI and DL TCI.
- a point may be one TCI state that applies to both UL and DL, or it may be two TCI states that apply to UL and DL, respectively.
- At least one of the multiple TCI states configured by the RRC parameters and the multiple TCI states activated by the MAC CE may be referred to as a TCI pool (common TCI pool, joint TCI pool, TCI state pool).
- the multiple TCI states activated by the MAC CE may be referred to as an active TCI pool (active common TCI pool).
- the higher layer parameters (RRC parameters) that set multiple TCI states may be referred to as configuration information that sets multiple TCI states, or simply as “configuration information.” Also, in this disclosure, being instructed to set one of multiple TCI states using DCI may mean receiving indication information that indicates one of the multiple TCI states included in DCI, or may simply mean receiving "instruction information.”
- the RRC parameters configure multiple TCI states for both DL and UL (joint common TCI pool).
- the MAC CE may activate multiple TCI states (active TCI pools) out of the configured multiple TCI states. Separate active TCI pools for each of UL and DL may be configured/activated.
- the DL DCI or new DCI format may select (indicate) one or more (e.g., one) TCI states.
- the selected TCI state may apply to one or more (or all) DL channels/RS.
- the DL channels may be PDCCH/PDSCH/CSI-RS.
- the UE may determine the TCI state of each DL channel/RS using the TCI state behavior (TCI framework) of Rel. 16.
- the UL DCI or new DCI format may select (indicate) one or more (e.g., one) TCI states.
- the selected TCI state may apply to one or more (or all) UL channels/RS.
- the UL channels may be PUSCH/SRS/PUCCH. In this way, different DCIs may indicate UL TCI and DL DCI separately.
- the MAC CE/DCI will support beam activation/indication to a TCI state associated with a different physical cell identifier (PCI). Also, in Rel. 18 NR and later, it is assumed that the MAC CE/DCI will support indicative serving cell change to a cell with a different PCI.
- PCI physical cell identifier
- the method of setting/indicating the TCI state in FIG. 1A e.g., joint DL/UL TCI state
- the method of setting/indicating the application of the TCI state in FIG. 1B may be switched and applied. Whether the joint DL/UL TCI state or the separate TCI state is applied may be set by the base station to the UE by a higher layer parameter.
- the UE can configure a list of up to 128 DLorJointTCIState configurations in PDSCH-Config.
- the UE may apply the DLorJointTCIState or UL-TCIState setting from the reference BWP of the reference CC. If the UE has DLorJointTCIState or UL-TCIState set in any CC in the same band, it is not assumed that TCI-State, SpatialRelationInfo (spatial relation information), or PUCCH-SpatialRelationInfo (PUCCH spatial relation information) in that band is set, except for SpatialRelationInfoPos (spatial relation information for position).
- SpatialRelationInfo spatial relation information
- PUCCH-SpatialRelationInfo PUCCH spatial relation information
- the UE assumes that if the UE has TCI-State in any CC in the CC list configured by simultaneousTCI-UpdateList1-r16, simultaneousTCI-UpdateList2-r16, simultaneousSpatial-UpdatedList1-r16, or simultaneousSpatial-UpdatedList2-r16, the UE does not configure DLorJointTCIState or UL-TCIState in any CC in the CC list.
- the UE receives an activation command that is used to map up to eight TCI states and/or TCI state pairs, with one TCI state for DL channels/signals and one TCI state for UL channels/signals, to code points of the DCI field 'Transmission Configuration Indication' (TCI) for one of the CC/DL BWPs or for a set of CC/DL BWPs, if available.
- TCI Transmission Configuration Indication
- a set of TCI state IDs is activated for a set of CC/DL BWPs and, if available, for one of the CC/DL BWPs, the same set of TCI state IDs applies to all DL and/or UL BWPs in the indicated CC, where the applicable list of CCs is determined by the CCs indicated in the activation command.
- the UE applies the indicated DLorJointTCIState and/or UL-TCIState to one or a set of CC/DL BWPs, and if the indicated mapping to a single TCI code point applies, the UE applies the indicated DLorJointTCIState and/or UL-TCIState to one or a set of CC/DL BWPs.
- the UE shall assume that the QCL type A/D source RS is set in the CC/DL BWP to which the TCI state applies.
- Unified TCI Framework supports the following modes 1 to 3: [Mode 1] MAC CE based TCI state indication [Mode 2] DCI based TCI state indication by DCI format 1_1/1_2 with DL assignment [Mode 3] DCI based TCI state indication by DCI format 1_1/1_2 without DL assignment
- TCI State ID receives DCI format 1_1/1_2 providing indicated TCI state with Rel.
- DCI format 1_1/1_2 may or may not be accompanied by DL assignment if one is available.
- DCI format 1_1/1_2 does not carry a DL assignment
- the UE can assume (verify) the following for that DCI: -
- the CS-RNTI is used to scramble the CRC for the DCI.
- the values of the following DCI fields are set as follows: -
- the redundancy version (RV) field is all '1's.
- the modulation and coding scheme (MCS) field is all '1's.
- NDI new data indicator
- the frequency domain resource assignment (FDRA) field is all '0's for FDRA type 0 or all '1's for FDRA type 1 or all '0's for Dynamic Switch (similar to PDCCH validation for release of DL semi-persistent scheduling (SPS) or UL grant type 2 scheduling).
- DCI in the above Mode 2/Mode 3 may be called beam instruction DCI.
- Rel. 15/16 if the UE does not support active BWP change via DCI, the UE will ignore the BWP indicator field.
- a similar behavior is considered for the relationship between Rel. 17 TCI state support and the interpretation of the TCI field. If the UE is configured with Rel. 17 TCI state, the TCI field will always be present in DCI format 1_1/1_2, and if the UE does not support TCI update via DCI, the UE will ignore the TCI field.
- the presence or absence of a TCI field (TCI presence information in DCI, tci-PresentInDCI) is set for each CORESET.
- the TCI field in DCI format 1_1 is 0 bits if the higher layer parameter tci-PresentInDCI is not enabled, and 3 bits otherwise. If the BWP indicator field indicates a BWP other than the active BWP, the UE shall follow the following actions: [Operation] If the higher layer parameter tci-PresentInDCI is not enabled for the CORESET used for the PDCCH carrying that DCI format 1_1, the UE shall assume that tci-PresentInDCI is not enabled for all CORESETs in the indicated BWP, otherwise the UE shall assume that tci-PresentInDCI is enabled for all CORESETs in the indicated BWP.
- the TCI field in DCI format 1_2 is 0 bit if the higher layer parameter tci-PresentInDCI-1-2 is not set, otherwise it is 1, 2 or 3 bits determined by the higher layer parameter tci-PresentInDCI-1-2. If the BWP indicator field indicates a BWP other than the active BWP, the UE shall follow the following actions.
- the UE shall assume that tci-PresentInDCI is not enabled for all CORESETs in the indicated BWP, otherwise the UE shall assume that tci-PresentInDCI-1-2 for all CORESETs in the indicated BWP is set with the same value as tci-PresentInDCI-1-2 set for the CORESET used for the PDCCH carrying that DCI format 1_2.
- Figure 2A shows an example of a DCI-based joint DL/UL TCI status indication.
- a TCI status ID indicating the joint DL/UL TCI status is associated with the value of the TCI field for the joint DL/UL TCI status indication.
- FIG. 2B shows an example of a DCI-based separate DL/UL TCI status indication.
- At least one TCI status ID is associated with the value of the TCI field for the separate DL/UL TCI status indication: a TCI status ID indicating a DL-only TCI status and a TCI status ID indicating a UL-only TCI status.
- TCI field values 000 to 001 are associated with only one TCI status ID for DL
- TCI field values 010 to 011 are associated with only one TCI status ID for UL
- TCI field values 100 to 111 are associated with both one TCI status ID for DL and one TCI status ID for UL.
- the unified/common TCI state may mean the Rel. 17 TCI state indicated using (Rel. 17) DCI/MAC CE/RRC (indicated Rel. 17 TCI state).
- TCI state indicates whether or not TCI is mapped to multiple types of signals (channels/RS).
- unified/common TCI state TCI state applicable to multiple types of signals (channels/RS)
- TCI state for multiple types of signals channels/RS
- the indicated Rel. 17 TCI state may be shared with at least one of the UE-specific reception on PDSCH/PDCC (updated using Rel. 17 DCI/MAC CE/RRC), PUSCH of dynamic grant (DCI)/configured grant, and multiple (e.g., all) dedicated PUCCH resources.
- the TCI state indicated by the DCI/MAC CE/RRC may be referred to as the indicated TCI state, the unified TCI state.
- a TCI state other than the unified TCI state may refer to a Rel. 17 TCI state configured using the (Rel. 17) MAC CE/RRC (configured Rel. 17 TCI state).
- the configured Rel. 17 TCI state, the configured TCI state, a TCI state other than the unified TCI state, and a TCI state applied to a specific type of signal (channel/RS) may be interpreted as being mutually interchangeable.
- the configured Rel. 17 TCI state may not be shared with at least one of the UE-specific reception of PDSCH/PDCCH (updated using Rel. 17 DCI/MAC CE/RRC), PUSCH of dynamic grant (DCI)/configured grant, and multiple (e.g., all) dedicated PUCCH resources.
- the configured Rel. 17 TCI state may be configured by RRC/MAC CE for each CORESET/resource/resource set, and may not be updated even if the indicated Rel. 17 TCI state (common TCI state) described above is updated.
- the indicated Rel. 17 TCI state will be applied to UE-specific channels/signals (RS). It is also being considered that the UE will be notified using higher layer signaling (RRC signaling) as to whether the indicated Rel. 17 TCI state or the configured Rel. 17 TCI state will be applied to non-UE-specific channels/signals.
- RS UE-specific channels/signals
- RRC signaling higher layer signaling
- the RRC parameters for the configured Rel. 17 TCI state (TCI state ID) will have the same configuration as the RRC parameters for the TCI state in Rel. 15/16. It is being considered that the configured Rel. 17 TCI state will be configured/instructed for each CORESET/resource/resource set using RRC/MAC CE. It is also being considered that the UE will make decisions regarding the configuration/instruction based on specific parameters.
- the UE will update the indicated TCI state and the configured TCI state separately. For example, if the unified TCI state for the indicated TCI state is updated for the UE, the configured TCI state may not need to be updated. It is also being considered that the UE will make a decision about the update based on a specific parameter.
- RRC/MAC CE higher layer signaling
- TCI state indication for intra-cell beam indication (TCI state indication), it is being considered to support Rel. 17 TCI state indication for UE-specific CORESET and PDSCH associated with that CORESET, and non-UE-specific CORESET and PDSCH associated with that CORESET.
- inter-cell beam indication e.g., L1/L2 inter-cell mobility
- support for indicating Rel. 17 TCI states for UE-specific CORESETs and PDSCHs associated with the CORESETs is under consideration.
- the legacy MAC CE/RACH signaling mechanism may be used.
- the CSI-RS related to the Rel. 17 TCI state applied to CORESET#0 may be QCL'd with the SSB related to the serving cell PCI (physical cell ID) (similar to Rel. 15).
- CORESETs with a common search space (CSS), and CORESETs with a CSS and a UE-specific search space (USS), whether to follow the indicated Rel. 17 TCI state may be configured for each CORESET by an RRC parameter. If the indicated Rel. 17 TCI state is not configured for that CORESET, the configured Rel. 17 TCI state may be applied to that CORESET.
- CCS common search space
- USS UE-specific search space
- RRC parameters may be configured for each channel/resource/resource set to follow or not follow the indicated Rel. 17 TCI state. If the indicated Rel. 17 TCI state is not configured for that channel/resource/resource set, the configured Rel. 17 TCI state may be applied to that channel/resource/resource set.
- the indicated TCI state by the MAC CE/DCI may apply to the following channels/RS:
- CORESET0 follows the TCI state activated by the MAC CE or is QCL'd with SSB.
- the indicated TCI state For a CORESET with index other than 0 with USS/CSS type 3, the indicated TCI state always applies.
- the indicated TCI state applies. Otherwise, the configured TCI state for that CORESET applies to that CORESET.
- [PDSCH] - The indicated TCI state always applies for all UE-dedicated PDSCHs.
- a non-UE-dedicated PDSCH PDSCH scheduled by a DCI in the CSS
- followUnifiedTCIState is set (for the CORESET of the PDCCH that schedules the PDSCH)
- the indicated TCI state may apply. Otherwise, the configured TCI state for the PDSCH applies to the PDSCH.
- followUnifiedTCIState is not set for a PDSCH, whether a non-UE-dedicated PDSCH follows the indicated TCI state may depend on whether followUnifiedTCIState is set for the CORESET used to schedule the PDSCH.
- CSI-RS For an A-CSI-RS for CSI acquisition or beam management, if followUnifiedTCIState is set (for the CORESET of the PDCCH that triggers that A-CSI-RS), the indicated TCI state applies. For other CSI-RSs, the configured TCI state for that CSI-RS applies.
- Beam application time (BAT) Regarding the DCI-based beam indication in Rel. 17, the following studies 1 and 2 are being considered regarding the application time of the indication of the beam/unified TCI state (beam application time (BAT) conditions). .
- the first slot to apply the indicated TCI is at least Y symbols after the last symbol of the acknowledgement (ACK) for the joint or separate DL/UL beam indication. It is contemplated that the first slot to apply the indicated TCI is at least Y symbols after the last symbol of the ACK/negative acknowledgement (NACK) for the joint or separate DL/UL beam indication.
- Y symbols may be set by the base station based on the UE capabilities reported by the UE. The UE capabilities may be reported on a symbol-by-symbol basis.
- Figure 3 shows an example of the application time of the unified TCI status indication.
- the ACK may be an ACK for a PDSCH scheduled by the beam indication DCI.
- the PDSCH may not be transmitted.
- the ACK in this case may be an ACK for the beam indication DCI.
- the value of the Y symbol will also be different, so the application time may differ between multiple CCs.
- the application timing/BAT of the beam instruction may follow any of the following options 1 to 3.
- [Option 1] Both the first slot and the Y symbol are determined on the carrier with the smallest SCS among the one or more carriers to which the beam direction applies.
- [Option 2] Both the first slot and the Y symbol are determined on the carrier with the smallest SCS among the one or more carriers to which the beam direction applies and the UL carrier carrying the ACK.
- [Option 3] Both the first slot and the Y symbol are determined on the UL carrier that carries the ACK.
- the application time (Y symbols) of beam direction for CA may be determined on the carrier with the smallest SCS among the carriers to which beam direction applies.
- Rel. 17 MAC CE based beam direction (when only a single TCI codepoint is activated) may follow the Rel. 16 application timeline for MAC CE activation.
- the indicated TCI state with Rel. 17 TCI state may start to apply from the first slot that is at least Y symbols after the last symbol of the PUCCH, where Y may be a higher layer parameter (e.g., BeamAppTime_r17[symbols]). Both the first slot and Y symbols may be determined on the carrier with the smallest SCS among the carriers for which the beam indication applies.
- the UE may assume one indicated TCI state with Rel17 TCI state for DL and UL, or one indicated TCI state with Rel17 TCI state for UL (separate from DL) at a given time.
- X [ms] may be used instead of Y [symbol].
- the UE reports at least one of the following UE capabilities 1 and 2.
- UE Capability 1 Minimum application time per SCS (minimum of Y symbols between the last symbol of the PUCCH carrying ACK and the first slot in which the beam is applied).
- UE Capability 2 Minimum time gap between the last symbol of the beam instruction PDCCH (DCI) and the first slot where the beam is applied. The gap between the last symbol of the beam instruction PDCCH (DCI) and the first slot where the beam is applied may meet the UE capability (minimum time gap).
- UE capability 2 may be an existing UE capability (e.g., timeDurationForQCL).
- the relationship between the beam instruction and the channel/RS to which the beam is applied may satisfy at least one of UE capabilities 1 and 2.
- the parameters set by the base station regarding the application time may be optional fields.
- Multi-TRP In NR, one or more transmission/reception points (TRPs) (multi-TRPs) are considered to perform DL transmission to a UE using one or more panels (multi-panels). It is also considered that a UE performs UL transmission to one or more TRPs.
- TRPs transmission/reception points
- multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs.
- the cell ID may be a physical cell ID (e.g., PCI) or a virtual cell ID.
- FIGS 4A-4D show examples of multi-TRP scenarios. In these examples, it is assumed that each TRP is capable of transmitting four different beams, but is not limited to this.
- FIG. 4A shows an example of a case where only one TRP (TRP1 in this example) of the multi-TRP transmits to the UE (which may be called single mode, single TRP, etc.).
- TRP1 transmits both a control signal (PDCCH) and a data signal (PDSCH) to the UE.
- PDCCH control signal
- PDSCH data signal
- single TRP mode may refer to the mode when multi-TRP (mode) is not set.
- FIG 4B shows an example of a case where only one TRP (TRP1 in this example) of the multi-TRP transmits a control signal to the UE, and the multi-TRP transmits a data signal (which may be called a single master mode).
- the UE receives each PDSCH transmitted from the multi-TRP based on one Downlink Control Information (DCI).
- DCI Downlink Control Information
- FIG. 4C shows an example of a case where each of the multi-TRPs transmits a part of a control signal to the UE and the multi-TRP transmits a data signal (which may be called a master-slave mode).
- TRP1 may transmit part 1 of the control signal (DCI) and TRP2 may transmit part 2 of the control signal (DCI).
- Part 2 of the control signal may depend on part 1.
- the UE receives each PDSCH transmitted from the multi-TRP based on these parts of DCI.
- FIG. 4D shows an example of a case where each of the multi-TRPs transmits a separate control signal to the UE, and the multi-TRP transmits a data signal (which may be called a multi-master mode).
- a first control signal (DCI) may be transmitted from TRP1
- a second control signal (DCI) may be transmitted from TRP2.
- the UE receives each PDSCH transmitted from the multi-TRP based on these DCIs.
- the DCI may be called a single DCI (S-DCI, single PDCCH). Also, when multiple PDSCHs from a multi-TRP such as that shown in FIG. 4D are scheduled using multiple DCIs, these multiple DCIs may be called multiple DCIs (M-DCI, multiple PDCCHs).
- Each TRP in a multi-TRP may transmit a different Transport Block (TB)/Code Word (CW)/different layer.
- TB Transport Block
- CW Code Word
- each TRP in a multi-TRP may transmit the same TB/CW/layer.
- Non-Coherent Joint Transmission is being considered as one form of multi-TRP transmission.
- TRP1 modulates and maps a first codeword, and transmits a first PDSCH using a first number of layers (e.g., two layers) and a first precoding by layer mapping.
- TRP2 modulates and maps a second codeword, and transmits a second PDSCH using a second number of layers (e.g., two layers) and a second precoding by layer mapping.
- multiple PDSCHs (multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains.
- the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap with each other in at least one of the time and frequency resources.
- the first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (QCL). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).
- QCL type D e.g., QCL type D
- PDSCH transport block (TB) or codeword (CW) repetition across multi-TRP is supported. It is considered that repetition methods (URLLC schemes, e.g., schemes 1, 2a, 2b, 3, 4) across multi-TRP in the frequency domain, layer (spatial) domain, or time domain are supported.
- URLLC schemes e.g., schemes 1, 2a, 2b, 3, 4
- multi-PDSCH from multi-TRP is space division multiplexed (SDM).
- SDM space division multiplexed
- FDM frequency division multiplexed
- RV redundancy version
- the RV may be the same or different for multi-TRP.
- multiple PDSCHs from multiple TRPs are time division multiplexed (TDM).
- TDM time division multiplexed
- multiple PDSCHs from multiple TRPs are transmitted in one slot.
- multiple PDSCHs from multiple TRPs are transmitted in different slots.
- Such a multi-TRP scenario allows for more flexible transmission control using channels with better quality.
- NCJT using multiple TRPs/panels may use high rank.
- both single DCI single PDCCH, e.g., FIG. 4B
- multiple DCI multiple PDCCH, e.g., FIG. 4D
- the maximum number of TRPs may be 2.
- TCI extension For single PDCCH design (mainly for ideal backhaul), TCI extension is being considered.
- Each TCI code point in the DCI may correspond to TCI state 1 or 2.
- the TCI field size may be the same as that of Rel. 15.
- one TCI state without CORESETPoolIndex (also called TRP Info) is set for one CORESET.
- a CORESET pool index is set for each CORESET.
- the DCI (which may be called a scheduling DCI) that schedules a channel (e.g., PDSCH) controls the number of TCI states that apply to that scheduled channel.
- the UE determines to use a single TRP, and if the DCI indicates two TCI states, the UE determines to use a multi-TRP. In this way, the UE switches between single TRP and multi-TRP based on the number of TCI states indicated by the DCI.
- the TCI state (e.g., unified TCI state) indicated by the beam instruction DCI will be applied after the BAT has elapsed since the transmission of the HARQ-ACK related to that DCI.
- TCI states are indicated to the UE by the RRC/MAC CE/DCI, and then one or more (e.g., two) TCIs are selected/determined from the X TCI states by the scheduling DCI.
- FIGS 5A-5C are diagrams showing an example of application of indicated TCI states. As shown in the example of Figure 5A, four indicated TCI states (TCI#1 as the first TCI state, TCI#2 as the second TCI state, TCI#3 as the third TCI state, and TCI#4 as the fourth TCI state) are indicated to the UE by the RRC/MAC CE/DCI.
- TCI#1 as the first TCI state
- TCI#2 as the second TCI state
- TCI#3 as the third TCI state
- TCI#4 as the fourth TCI state
- switching between single-TRP and multi-TRP is performed by a specific field (existing field (e.g., it may be a TCI field)/new field) included in the scheduling DCI (DCI format 1_1/1_2).
- a specific field existing field (e.g., it may be a TCI field)/new field) included in the scheduling DCI (DCI format 1_1/1_2).
- "00" is indicated as the code point of the field, indicating that the first TCI state is applied (i.e., single-TRP operation is indicated).
- Figure 5C shows an example of a UE receiving a scheduling DCI and a scheduled PDSCH, and transmitting a PUCCH corresponding to the PDSCH.
- the DCI indicates that the first TCI state should be applied, as shown in Figure 5B.
- the UE determines that the first TCI state (indicated TCI state, joint/DL TCI state) should be applied to the PDSCH.
- the application of the TCI state as shown in Figures 5A-5C is possible if the PDSCH is received after the decoding of the scheduling DCI is completed. If this is not the case (e.g., if the scheduling offset is smaller than a certain threshold), the UE cannot determine the indicated TCI state to apply to the channel/signal (in this case, the PDSCH).
- a case where multiple CORESETs are assigned (or monitored) before the PDSCH is also assumed (see Figure 6).
- a case is shown in which a PDSCH is scheduled after the assignment of a first CORESET #1 and a second CORESET #2.
- the UE cannot determine which CORESET schedules the PDSCH or which TCI state is indicated by the DCI before the combination of the DCI is completed.
- Consideration 1 Addition of a new DCI field (which may simply be called a new field) for unified TCI state.
- - Consideration 2 A method in which a UE determines an indicated TCI state to apply to a channel/signal when the offset (synonymous with the scheduling offset described above) between the reception of a scheduling DCI (DCI format 1_1/1_2) and the reception of a PDSCH corresponding to the DCI is smaller than a specific threshold, regardless of the presence or absence of a new DCI field.
- Study 3 Application method when receiving PDSCH scheduled by DCI format 1_0.
- the inventors came up with a method for appropriately performing operations related to the unified TCI state.
- A/B and “at least one of A and B” may be interpreted as interchangeable.
- A/B/C may mean “at least one of A, B, and C.”
- Radio Resource Control RRC
- RRC parameters RRC parameters
- RRC messages higher layer parameters, fields, information elements (IEs), settings, etc.
- IEs information elements
- CE Medium Access Control
- update commands activation/deactivation commands, etc.
- higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or any combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- the MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc.
- the broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI System Information
- the physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), etc.
- DCI Downlink Control Information
- UCI Uplink Control Information
- index identifier
- indicator indicator
- resource ID etc.
- sequence list, set, group, cluster, subset, etc.
- DMRS nal
- antenna port group e.g., DMRS port group
- group e.g., spatial relationship group, Code Division Multiplexing (CDM) group, reference signal group, CORESET group, Physical Uplink Control Channel (PUCCH) group, PUCCH resource group
- resource e.g., reference signal resource, SRS resource
- resource set e.g., reference signal resource set
- CORESET pool downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state (UL TCI state), unified TCI state, common TCI state, indicated TCI state, quasi-co-location (QCL), QCL assumption, etc.
- TCI state downlink Transmission Configuration Indication state
- DL TCI state DL TCI state
- uplink TCI state UL TCI state
- unified TCI state common TCI state
- indicated TCI state indicated TCI state
- QCL quasi-co-location
- QCL assumption etc.
- the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be read as interchangeable.
- ID spatial relationship information
- TCI state and TCI may be read as interchangeable.
- the panel identifier (ID) and panel may be read as interchangeable.
- the TRP ID and TRP, the CORESET group ID and CORESET group, etc. may be read as interchangeable.
- TRP transmission point
- panel DMRS port group
- CORESET pool one of two TCI states associated with one code point in the TCI field
- the transmission/reception of a channel/signal using a single TRP may be interpreted as the TCI states (joint/separate/indicative TCI states) being equal in the transmission/reception of that channel/signal (e.g., NCJT/CJT/repeat), or the number of TCI states (joint/separate/indicative TCI states) being one in the transmission/reception of that channel/signal (e.g., NCJT/CJT/repeat).
- Transmission/reception of a channel/signal using a single TRP may be interpreted as the TCI states (joint/separate/indicated TCI states) being different in the transmission/reception of the channel/signal (e.g., NCJT/CJT/repeat), or the number of different TCI states (joint/separate/indicated TCI states) being multiple (e.g., two) in the transmission/reception of the channel/signal (e.g., NCJT/CJT/repeat).
- single TRP, single TRP system, single TRP transmission, and single PDSCH may be read as interchangeable.
- multi TRP, multi TRP system, multi TRP transmission, and multi PDSCH may be read as interchangeable.
- a single DCI, a single PDCCH, multiple TRP based on a single DCI, activating two TCI states on at least one TCI code point, mapping at least one code point of a TCI field to two TCI states, and setting a specific index (e.g., a TRP index, a CORESET pool index, or an index corresponding to a TRP) for a specific channel/CORESET may be interpreted as interchangeable.
- a single TRP, a channel/signal using a single TRP, a channel using one TCI state/spatial relationship, multi-TRP not being enabled by RRC/DCI, multiple TCI states/spatial relationships not being enabled by RRC/DCI, a CORESETPoolIndex value of 1 not being set for any CORESET, and no code point in the TCI field being mapped to two TCI states may be read as interchangeable.
- multi-TRP channel/signal using multi-TRP, channel using multiple TCI states/spatial relationships, multi-TRP enabled by RRC/DCI, multiple TCI states/spatial relationships enabled by RRC/DCI, and at least one of multi-TRP based on a single DCI and multi-TRP based on multiple DCI may be read as interchangeable.
- multi-TRP based on multi-DCI setting one CORESET pool index (CORESETPoolIndex) value for a CORESET
- multiple specific indexes e.g., TRP indexes, CORESET pool indexes, or indexes corresponding to TRPs
- TRP#2 (second TRP)
- single DCI sDCI
- single PDCCH multi-TRP system based on single DCI
- sDCI-based MTRP multi-TRP system based on single DCI
- activation of two TCI states on at least one TCI codepoint may be read as interchangeable.
- multi-DCI multi-PDCI
- multi-PDCCH multi-PDCCH
- multi-TRP system based on multi-DCI
- mDCI-based MTRP multi-DCI-based MTRP
- beam instruction DCI, beam instruction MAC CE, and beam instruction DCI/MAC CE may be interpreted as interchangeable.
- an instruction regarding the instruction TCI state to the UE may be given using at least one of DCI and MAC CE.
- channel, signal, and channel/signal may be read as interchangeable.
- DL channel, DL signal, DL signal/channel, transmission/reception of DL signal/channel, DL reception, and DL transmission may be read as interchangeable.
- UL channel, UL signal, UL signal/channel, transmission/reception of UL signal/channel, UL reception, and UL transmission may be read as interchangeable.
- applying TCI state/QCL assumptions to each channel/signal/resource may mean applying TCI state/QCL assumptions to transmission and reception of each channel/signal/resource.
- the first TRP may correspond to the first TCI state (the first TCI state indicated).
- the second TRP may correspond to the second TCI state (the second TCI state indicated).
- the nth TRP may correspond to the nth TCI state (the nth TCI state indicated).
- the first CORESET pool index value (e.g., 0), the first TRP index value (e.g., 1), and the first TCI state (first DL/UL (joint/separate) TCI state) may correspond to each other.
- the second CORESET pool index value (e.g., 1), the second TRP index value (e.g., 2), and the second TCI state (second DL/UL (joint/separate) TCI state) may correspond to each other.
- the application of multiple TCI states in transmission and reception using multiple TRPs will be mainly described in terms of a method targeting two TRPs (i.e., when at least one of N and M is 2), but the number of TRPs may be three or more (multiple), and each embodiment may be applied to correspond to the number of TRPs. In other words, at least one of N and M may be a number greater than 2.
- the joint TCI state, DL/UL TCI state, separate TCI state, and separate DL/UL TCI state may be interpreted as mutually interchangeable.
- the indicated joint TCI state, indicated DL/UL TCI state, and indicated TCI state may be interpreted as mutually interchangeable.
- new DCI field “new field,” “TCI status field,” and “both new DCI field and TCI status field” may be read interchangeably.
- the first embodiment relates to the application of a unified TCI state in a single DCI based multi-TRP and describes the mapping (application) of an indicated TCI state to a downlink channel (e.g. PDSCH)/signal (RS).
- a downlink channel e.g. PDSCH
- RS signal
- Embodiment 1.1 application of the unified TCI state to PDSCH reception is described.
- a new DCI field (e.g., 2 bits) in DCI format 1_1/1_2 for scheduling/activating PDSCH reception may be supported.
- the new DCI field may be used to determine whether one or both of multiple (e.g., two) indication joint/DL TCI states should be applied to the PDSCH reception. This allows the UE to appropriately determine the application of indication joint/DL TCI states to the scheduled/activated PDSCH reception.
- the UE may buffer the received signal using both multiple joint indication/DL TCI states.
- a predefined threshold e.g., timeDurationForQCL
- the UE may apply both of the multiple indication joint/DL TCI states to PDSCH reception. In other cases (e.g., if sfnSchemePdsch is not configured), the UE may apply only one (1st) indication joint/DL TCI state to PDSCH reception. This operation may also be applied to PDSCH reception scheduled by DCI format 1_1/1_2 that does not include a new DCI field. In this case, if the environment does not include dynamic switching between indication TCI state/single TRP and multi-TRP, it is possible to reduce DCI overhead.
- the SFN setting parameter for PDSCH e.g., sfnSchemePdsch
- the UE may apply both of the multiple indication joint/DL TCI states to PDSCH reception. This operation may also be applied to PDSCH reception scheduled by DCI format 1_0. Alternatively, the UE may apply one of the two (1st/2nd) indication joint/DL TCI states to PDSCH reception. Whether one of the indication joint/DL TCI states is applied may be set by higher layer signaling.
- the presence of a new DCI field may be configured by higher layer signaling. For example, if there is no new DCI field in DCI format 1_1/1_2, the UE may apply the default TCI state (default indication joint/DL TCI state) for the corresponding PDSCH reception. There may be multiple default TCI states.
- FIGs 7A to 7C are diagrams showing an example of application of the indicated TCI state according to the first embodiment.
- the TCI status field in the existing DCI format 1_1/1_2 is already used to indicate the TCI status. Therefore, a new DCI field may be added to indicate the index of each of the multiple TCI states.
- FIGS 7A-7C show an example of a scheduling DCI indicating one or two TCI state indexes.
- two indicated TCI states (TCI#1 as the first TCI state and TCI#2 as the second TCI state) may be indicated to the UE by the RRC/MAC CE/DCI.
- one or two TCI states are indicated (or switching between single TRP and multi-TRP) by a specific field (existing field (e.g., it may be a TCI field)/new field) included in the scheduling DCI (DCI format 1_1/1_2).
- a 2-bit new DCI field is associated with an index of one/two indicated TCI states.
- the UE may receive the PDSCH before DCI decoding (e.g., DCI coding) is complete. Therefore, the UE must buffer the received signal in advance under a certain QCL assumption. This operation is called the default QCL assumption in the existing specifications (Rel. 15-17).
- FIG. 7C shows an example of a UE receiving a scheduling DCI and a scheduled PDSCH.
- the DCI indicates that the first TCI state should be applied, as shown in FIG. 7B.
- the addition of a new DCI field allows one/two indicated TCI states to be indicated.
- the UE buffers the received signal based on the indicated TCI state and completes DCI decoding.
- the UE can then recognize (understand) the index of the indicated TCI state and can decode (receive) the PDSCH based on the index.
- the UE may complete DCI decoding (e.g., DCI decoding) after buffering, and then perform reception processing (e.g., reception/demodulation/decoding) of the PDSCH in the joint/DL TCI state (here, TCI state #1) indicated by the DCI.
- DCI decoding e.g., DCI decoding
- reception processing e.g., reception/demodulation/decoding
- the second reception processing e.g., reception processing after DCI decoding
- the UE may perform a first reception process (e.g., buffering) on the received signal based on two joint/DL TCI states (e.g., TCI state #1 and TCI state #2), and then perform a second reception process on the received signal based on the joint/DL TCI state (here, TCI state #1) indicated by the DCI after completing DCI decoding (e.g., DCI decoding).
- a first reception process e.g., buffering
- TCI state #1 and TCI state #2 e.g., TCI state #1
- DCI decoding e.g., DCI decoding
- the UE buffers the received signal in two joint/DL TCI states (e.g., TCI state #1 and TCI state #2) in advance for the period when the scheduling offset ⁇ a predetermined threshold (e.g., timeDurationForQCL), and can determine in which joint/DL TCI state to receive the PDSCH after DCI decoding is completed.
- a predetermined threshold e.g., timeDurationForQCL
- Such operations may be applied regardless of whether an RRC parameter (e.g., followUnifiedTCI) indicating following the unified TCI state is set.
- RRC parameter e.g., followUnifiedTCI
- Such operations may be applied regardless of whether the scheduling offset (offset between DCI and PDSCH) is less than a predetermined threshold (e.g., timeDurationForQCL).
- a predetermined threshold e.g., timeDurationForQCL
- such operations may be applied regardless of the CORESET (e.g., scheduling CORESET) used for scheduling.
- such operations may be applied regardless of whether a scheduling DCI format/TCI state field is present.
- the UE may buffer the received signal in all indication joint/DL TCI states.
- the UE cannot distinguish between DCI formats before DCI decoding is complete. Therefore, the UE needs to adjust its QCL assumptions to buffer the received signal for any DCI format (regardless of the type of DCI format).
- the UE can buffer the received signal using both of them. Then, after the UE recognizes the DCI format (type), the UE can receive the PDSCH related to one/two indicated TCI states.
- the recognized DCI format may include the presence (or absence) of a new DCI field corresponding to the index of the indicated TCI state.
- TCI status field is not present for DCI format 1_0/1_1/1_2, two TCI states may be applied for a single DCI-based multi-TRP in each of the following cases:
- ⁇ Case 1> When a UE is configured with an SFN setting parameter for PDCCH (e.g., sfnSchemePdcch) and an SFN setting parameter for PDSCH (e.g., sfnSchemePdsch), and the scheduling offset (the offset between DCI and PDSCH in the serving cell) is greater than or equal to a predetermined threshold (e.g., timeDurationForQCL), two TCI states corresponding to the scheduling CORESET may be applied to the PDSCH scheduled by DCI format 1_0/1_1/1_2.
- a predetermined threshold e.g., timeDurationForQCL
- a higher layer parameter e.g., enableTwoDefaultTCI-States
- a predetermined threshold e.g., timeDurationForQCL
- both of the two indicated TCI states should be applied to the PDSCH scheduled by DCI format 1_0 or DCI format 1_1/1_2 that does not include a new DCI field. Also, even in the case of non-coherent joint transmission/repetition in a single DCI-based multi-TRP, both of the two indicated TCI states may be applied to the PDSCH scheduled by DCI format 1_1/1_2 that does not include a new DCI field.
- a case where there are one/two indication joint/DL TCI states may be a case where one/two indication joint/DL TCI states are applicable.
- this may be a case where one/two indication joint/DL TCI states are supported/configured/applied in the CC/BWP, or where it is configured by an RRC parameter that two indication joint/DL TCI states are supported/configured/applicable, or where one/two indication joint/DL TCI states are activated (e.g., one/two TCI states are mapped to one code point in a specified field of the DCI).
- the UE may apply the one indicated joint/DL TCI state for PDSCH reception.
- operation #1 may be applied to some PDSCH receptions.
- operation #1 may be applied only to PDSCHs scheduled by a specific CORESET.
- the specific CORESET may be at least one of a CORESET with only USS/only CSS/both CSS and USS, a CORESET with/without CORESET0, a CORESET with followUnifiedTCIState set, and a CORESET with followUnifiedTCIState not set.
- the specific CORESET may be called a scheduling CORESET.
- operation #1 may be applied only in a specific DCI format.
- the specific DCI format may be at least one of DCI format 1_1/1_2 including a TCI status field/new DCI field, DCI format 1_1/1_2 not including a TCI status field/new DCI field, and DCI format 1_0.
- the specific DCI format may be referred to as a scheduling DCI (format).
- the UE may apply both of the two indication joint/DL TCI states or one of the two indication joint/DL TCI states for PDSCH reception.
- operation #2 may be applied to some PDSCH receptions.
- operation #2 may be applied only to PDSCHs scheduled by a specific CORESET.
- the specific CORESET may be at least one of a CORESET with only USS/only CSS/both CSS and USS, a CORESET with/without CORESET0, a CORESET with followUnifiedTCIState set, and a CORESET with followUnifiedTCIState not set.
- operation #2 may be applied only in a specific DCI format.
- the specific DCI format may be at least one of DCI format 1_1/1_2 including a TCI status field/new DCI field, DCI format 1_1/1_2 not including a TCI status field/new DCI field, and DCI format 1_0.
- Whether the UE applies any of the above-mentioned actions #1/#2, i.e., whether the UE applies one/two indication joint/DL TCI states, may be set/indicated/switched based on any of the following conditions (options 1-3): ⁇ Option 1> Based on the new DCI/TCI status fields described above. ⁇ Option 2> Subject to certain conditions/rules as detailed below. ⁇ Option 3> If the new DCI field is not included in the DCI format (e.g., when PDSCH is scheduled by DCI format 1_0 or when the new DCI field is not configured in DCI format 1_1/1_2), it is based on certain conditions/rules as described below.
- the specific condition/rule may be at least one of the conditions listed below (conditions 1-7).
- the particular CORESET may be at least one of a CORESET with USS only/CSS only/both CSS and USS, a CORESET with/without CORESET0, a CORESET with followUnifiedTCIState set, and a CORESET with followUnifiedTCIState not set.
- the specific DCI format may be at least one of DCI format 1_1/1_2 including a TCI status field/new DCI field, DCI format 1_1/1_2 not including a TCI status field/new DCI field, and DCI format 1_0.
- ⁇ Condition 3> whether a Single Frequency Network (SFN) has been set for the CORESET. For example, if an SFN is configured for a CORESET, two indication joint/DL TCI states may be applied to the CORESET, otherwise (e.g., if an SFN is not configured for a CORESET), one indication joint/DL TCI state may be applied to the CORESET.
- SFN Single Frequency Network
- Whether SFN has been set for the PDSCH For example, if a SFN is configured for a PDSCH, two indication joint/DL TCI states may be applied to the PDSCH, otherwise (e.g., if a SFN is not configured for a PDSCH), one indication joint/DL TCI state may be applied to the PDSCH.
- a single DCI based multi-TRP (e.g. non-coherent joint transmission/retransmission (TDM/FDM/SDM repetition)) is configured for PDSCH.
- TDM/FDM/SDM repetition a single DCI based multi-TRP
- two indication joint/DL TCI states may be applied to the PDSCH, otherwise (e.g., if a single DCI-based multi-TRP is not configured for a PDSCH), one indication joint/DL TCI state may be applied to the PDSCH.
- ⁇ Condition 7> whether a multi-DCI based multi-TRP (e.g., CORESETPoolIndex) is configured for PDSCH. For example, if a multi-DCI based multi-TRP is configured for a PDSCH, two indication joint/DL TCI states may be applied to the PDSCH, otherwise (e.g., if a multi-DCI based multi-TRP is not configured for a PDSCH), one indication joint/DL TCI state may be applied to the PDSCH.
- a multi-DCI based multi-TRP e.g., CORESETPoolIndex
- the above-mentioned specific conditions/rules may be set by higher layer signaling.
- the RRC/MAC CE may indicate whether one/two indication joint/DL TCI states are applicable, and the UE may determine the number of indication joint/DL TCI states to apply according to the indication.
- the MAC CE may be a MAC CE that notifies other information (e.g., a MAC CE that notifies activation of an indication joint/DL TCI state).
- a specific field of the MAC CE e.g., an R field consisting of 1 bit
- the R field is 0, one indication joint/DL TCI state may be applied, and if the R field is 1, two indication joint/DL TCI states may be applied.
- the UE may apply one indicated joint/DL TCI state for a certain PDSCH reception.
- a case where multi-TRP/SFN is not set may be added as an application condition.
- One indicated joint/DL TCI state may be set/indicated based on any of the above-mentioned rules.
- the UE may determine the one indicated joint/DL TCI state based on a predetermined rule. For example, the UE may always apply the first/second indicated TCI state. In addition, whether the first/second indicated TCI state is to be applied may be set/instructed using higher layer signaling/physical layer signaling.
- the UE can appropriately control the mapping (application) of the indicated TCI state for PDSCH reception.
- Embodiment 1.2 the application of the unified TCI state to CSI-RS reception will be described.
- the contents of the above-mentioned embodiment 1.1 can be applied to this embodiment by replacing "PDSCH" with "CSI-RS”. Therefore, overlapping descriptions will be omitted as appropriate, and differences will be mainly described.
- the UE may apply the one indicated joint/DL TCI state for CSI-RS reception.
- operation #1 may be applied to some CSI-RS receptions. Specifically, it may be restricted based on the type of CSI-RS (periodic/semi-persistent/aperiodic). For example, in the case of aperiodic CSI-RS, operation #1 may be applied only in aperiodic CSI-RS scheduled/triggered by a specific CORESET.
- the specific CORESET may be at least one of a CORESET with USS only/CSS only/both CSS and USS, a CORESET with/without CORESET0, a CORESET with followUnifiedTCIState set, and a CORESET with followUnifiedTCIState not set.
- operation #1 may be applied only to aperiodic CSI-RS triggered by a specific DCI format.
- the specific DCI format may be at least one of DCI format 1_1/1_2 including a TCI status field/new DCI field, DCI format 1_1/1_2 not including a TCI status field/new DCI field, and DCI format 1_0.
- operation #1 may be applied only to a specific CSI-RS resource (set).
- followUnifiedTCI may be set as a parameter having two values such as ⁇ 1st, 2nd ⁇ , rather than as a single bit.
- FollowUnifiedTCI may also be set to one bit.
- whether to apply one of the indication joint/DL TCI states ⁇ 1st, 2nd ⁇ may be based on a value set for each CSI-RS resource (set) by higher layer signaling.
- the UE may determine the indication joint/DL TCI state to apply based on the TRP (CORESETPoolIndex) to which the triggering DCI corresponds.
- the UE may apply both of the two indication joint/DL TCI states or one of the two indication joint/DL TCI states for CSI-RS reception.
- operation #2 may be applied to some CSI-RS reception. Specifically, it may be restricted based on the type of CSI-RS (periodic/semi-persistent/aperiodic). For example, in the case of aperiodic CSI-RS, operation #2 may be applied only in aperiodic CSI-RS scheduled/triggered by a specific CORESET.
- the specific CORESET may be at least one of a CORESET with USS only/CSS only/both CSS and USS, a CORESET with/without CORESET0, a CORESET with followUnifiedTCIState set, and a CORESET with followUnifiedTCIState not set.
- operation #2 may be applied only to aperiodic CSI-RS triggered by a specific DCI format.
- the specific DCI format may be at least one of DCI format 1_1/1_2 including a TCI status field/new DCI field, DCI format 1_1/1_2 not including a TCI status field/new DCI field, and DCI format 1_0.
- operation #2 may be applied only to a specific CSI-RS resource (set).
- Whether the UE applies any of the above-mentioned operations #1/#2, i.e., whether the UE applies one/two indication joint/DL TCI states, may be set/indicated/switched based on any of the above-mentioned conditions (options 1-3).
- "PDSCH" in options 1-3 may be read as "CSI-RS”. Note that, when based on the new DCI field of option 1, the UE does not need to control the indication joint/DL TCI state for aperiodic CSI-RS.
- condition 1-7) in the above-mentioned embodiment 1.1 can be applied to this embodiment by replacing "PDSCH" with "CSI-RS.”
- the above-mentioned specific conditions/rules may be set by higher layer signaling.
- the RRC/MAC CE may indicate whether one/two indication joint/DL TCI states are applicable, and the UE may determine the number of indication joint/DL TCI states to apply according to the indication.
- the specific conditions/rules set by higher layer signaling may be specific conditions/rules set for a certain CORESET/PDSCH, or specific conditions/rules set for a certain CSI-RS.
- one of ⁇ 1st, 2nd, both ⁇ may be set for each CSI-RS resource (set).
- the UE may apply the corresponding indication joint/DL TCI state to CSI-RS reception.
- aperiodic CSI-RS which of ⁇ 1st, 2nd ⁇ to apply may be controlled by the trigger DCI.
- the indication joint/DL TCI state for aperiodic CSI-RS may be indicated using a field indicating either ⁇ 1st, 2nd, both ⁇ for PDSCH/PUSCH. For example, when ⁇ both ⁇ is set for CSI-RS, the UE may select one of the (1st/2nd) indication joint/DL TCI states based on higher layer signaling/predetermined rules.
- the UE may apply one indication joint/DL TCI state to a certain CSI-RS resource (set).
- a case where multi-TRP/SFN is not set may be added as an application condition.
- One indication joint/DL TCI state may be set/indicated based on any of the above-mentioned rules.
- the UE may determine the indicated joint/DL TCI state based on a predetermined rule. For example, the UE may always apply the first/second indicated TCI state.
- the UE can appropriately control the mapping (application) of the indicated TCI state to CSI-RS reception.
- Embodiment 1.3 the application of the unified TCI state to PDCCH reception will be described.
- the contents of the above-mentioned embodiment 1.1/1.2 can be applied to this embodiment by replacing "PDSCH/CSI-RS" with "PDCCH". Therefore, overlapping descriptions will be omitted as appropriate, and the different parts will be mainly described.
- the UE may apply the one indicated joint/DL TCI state for PDCCH reception.
- operation #1 may be applied to some PDCCH receptions.
- operation #1 may be applied only to PDCCHs that are supported by a specific CORESET.
- the specific CORESET may be at least one of a CORESET with only USS/only CSS/both CSS and USS, a CORESET with/without CORESET0, a CORESET with followUnifiedTCIState set, and a CORESET with followUnifiedTCIState not set.
- operation #1 may be applied only in a CORESET that transmits a specific DCI format.
- the specific DCI format may be at least one of DCI format 1_1/1_2 that includes a TCI status field/new DCI field, DCI format 1_1/1_2 that does not include a TCI status field/new DCI field, and DCI format 1_0.
- the followUnifiedTCI set in CORESET may be set as a parameter having three values such as ⁇ 1st, 2nd, both ⁇ , rather than as a single bit.
- followUnifiedTCI may be set to one bit. In this case, whether to apply one of the indication joint/DL TCI states ⁇ 1st, 2nd, both ⁇ may be based on the value set for each CORESET by higher layer signaling.
- the UE may apply both of the two indication joint/DL TCI states or one of the two indication joint/DL TCI states for PDCCH reception.
- condition under which action #2 is applied may be limited/restricted.
- the conditions may be the same as those for action #1 described above.
- Whether the UE applies any of the above-mentioned operations #1/#2, i.e., whether the UE applies one/two indication joint/DL TCI states, may be set/instructed/switched based on any of the above-mentioned conditions (options 1-3).
- "PDSCH/CSI-RS" in options 1-3 may be read as "PDCCH”. Note that, when based on the new DCI field in option 1, the UE does not need to control the indication joint/DL TCI state for the PDCCH.
- condition 1-7) in the above-mentioned embodiment 1.1/1.2 can be applied to this embodiment by replacing "PDSCH/CSI-RS" with "PDCCH”.
- the specific conditions/rules set by higher layer signaling can also be applied by replacing them in the same way.
- the UE can appropriately control the mapping (application) of the indicated TCI state for PDCCH reception.
- an SFN setting parameter for PDSCH (e.g., sfnSchemePdsch) is set, at least one of the following cases may be true:
- the SFN setting parameter for the PDCCH e.g., sfnSchemePdcch
- the SFN setting parameter for the PDSCH e.g., sfnSchemePdsch
- the scheduling offset offset between DCI and PDSCH
- a predetermined threshold e.g., timeDurationForQCL
- the application of both of the multiple indication joint/DL TCI states to PDSCH/CSI-RS/PDCCH reception may mean that one/multiple (two) TCI states corresponding to the smallest CORESET ID in the latest slot (last slot) are applied to PDSCH/CSI-RS/PDCCH reception.
- followUnifiedTCI is set for the CORESET, the same operation as described above will be applied.
- not including a (2-bit) new DCI field may be interpreted as not including a (2-bit) new DCI field/TCI status field.
- the UE can control the application of the 1/2 indication TCI status.
- the application of each operation in the above-described embodiment may be limited/restricted based on the following conditions:
- the SS of the scheduling CORESET is CSS/USS (not CORESET0/CORESET0),
- the specific DCI format is one of DCI formats 1_0/1_1/1_2; Whether the scheduling DCI includes a new DCI field/TCI status field; - Whether followUnifiedTCI is set in the scheduling CORESET and whether the indicated TCI state is followed.
- whether the UE applies a particular indication joint/DL TCI state may be determined based on the following conditions:
- the SS of the scheduling CORESET is CSS/USS (not CORESET0/CORESET0),
- the specific DCI format is one of DCI formats 1_0/1_1/1_2; Whether the scheduling DCI includes a new DCI field/TCI status field; - Whether followUnifiedTCI is set in the scheduling CORESET and whether to follow the indicated TCI state; -Depending on higher layer signaling settings.
- a case has been described in which the UE uses a new DCI field to determine the application of the indicated joint/DL TCI state.
- an existing field e.g., a TCI state field
- a 3-bit TCI state field may be used.
- the first four rows of the three bits may indicate a specific (multiple) indicated TCI state, and the remaining four rows may indicate which TCI state of the specific (multiple) indicated TCI states is applied.
- an existing TDRA/FDRA field may be used to apply the indicated joint/DL TCI state. Note that the first four rows and the remaining four rows are merely examples and are not limited to this.
- the number of the first rows and the remaining rows, or the ratio of the first rows and the remaining rows, may be specified in the specification or set by higher layer signaling.
- the first half of the line indicates a specific (multiple) designated TCI state
- the second half of the line indicates which of the designated TCI states is applied, but the correspondence between the first half of the line and the second half of the line may be reversed.
- the UE may update only one indicated J/DL TCI state and not update the other indicated J/DL TCI state (i.e., use the previously indicated TCI state). In other words, the total number of indicated J/DL TCI states may always be two.
- the proposal shown in FIG. 8 may be applied only when a new DCI field is set by RRC. If a new DCI field is not set, when scheduling is performed with DCI format 1_0/1_1, two indication joint/DL TCI states will always be applied, making it impossible to switch to single TRP by MAC CE/DCI. On the other hand, when a new DCI field is set, single TRP/multiple TRP switching is possible using the new DCI field, so there is no impact even if the proposal in FIG. 8 is applied.
- the full set or any subset of the first/second joint TCI status can be mapped to the TCI codepoints of the existing TCI status field of DCI format 1_1/1_2 (with or without DL assignment). If the UE receives a TCI codepoint mapped with a full set of first/second joint TCI states, the UE may apply the corresponding joint TCI state in the full set.
- the UE may apply the corresponding joint TCI state in the subset and retain the currently applied joint TCI state that is not in the subset.
- the full set or any subset of the first/second DL/UL TCI status can be mapped to the TCI codepoints of the existing TCI status field of DCI format 1_1/1_2 (with or without DL assignment). If the UE receives a TCI codepoint mapped with a full set of the first/second DL/UL TCI state, the UE may apply the corresponding DL/UL TCI state (separate TCI state) in the full set.
- the UE may apply the corresponding DL/UL TCI state (separate TCI state) in the subset and keep the currently applied DL/UL TCI state (separate TCI state) that is not in the subset.
- the UE can appropriately control the mapping (application) of the indicated TCI state to the downlink channel (e.g., PDSCH)/signal (RS).
- the downlink channel e.g., PDSCH
- RS signal
- the second embodiment relates to the application of a unified TCI state in a single DCI based multi-TRP and describes the mapping (application) of an indicated TCI state to an uplink channel (e.g. PUSCH)/signal (RS).
- an uplink channel e.g. PUSCH
- RS signal
- DCI format 1_0/1_1/1_2 in the first embodiment may be read as DCI format 0_0/0_1/0_2 in the second embodiment.
- Embodiment 2.1 application of the unified TCI state to PUSCH transmission is described.
- the contents of embodiment 1.1 described above can be applied to this embodiment by replacing "PDSCH” with “PUSCH” and “PDSCH reception” with “PUSCH transmission”.
- DCI fields may be used by the UE to determine/notify which indicated joint/UL TCI state should be applied among the indicated joint/UL TCI states indicated by the MAC CE/DCI.
- the 2-bit SRS resource set indicator field in DCI format 0_1/0_2 indicates either single-TRP PUSCH/multi-TRP PUSCH for dynamic switching between single-TRP PUSCH repeat transmission and multi-TRP PUSCH repeat transmission.
- FIG. 9 is a diagram showing an example of an SRS resource set indicator according to the second embodiment.
- FIG. 9 may be a table of the SRS resource set indicator field in the existing DCI format 0_1/0_2.
- a single TRP may be indicated by code points 0/1
- a multi-TRP may be indicated by code points 2/3. That is, in FIG. 9, the code points are associated with the type of PUSCH repeated transmission (single TRP/multi-TRP).
- the existing table shown in FIG. 9 may be reused for application of the unified TCI state to PUSCH transmissions.
- the indication joint/UL TCI status notification method for PUSCH transmission may follow at least one of the following methods 1-3: ⁇ Method 1> - Indicated using the existing SRS resource set indicator. According to this method, it is possible to avoid the complexity of UE implementation by utilizing existing specifications. ⁇ Method 2> - As with PDSCH, a new DCI field is used to notify. For example, it is possible to indicate any of ⁇ 1st, 2nd, both (1st+2nd), both (2nd+1st) ⁇ . According to this method, it is possible to simplify the operation by adopting the same method as PDSCH.
- operation #1 the UE operation when there is one indication joint/UL TCI state
- operation #2 the UE operation when there are two indication joint/UL TCI states
- a case where there are one/two indication joint/UL TCI states may be a case where one/two indication joint/UL TCI states are applicable.
- this may be a case where one/two indication joint/UL TCI states are supported/configured/applied in the CC/BWP, or where it is configured by an RRC parameter that two indication joint/UL TCI states are supported/configured/applicable, or where one/two indication joint/UL TCI states are activated (e.g., one/two TCI states are mapped to one code point in a specified field of the DCI).
- the UE may apply the one indicated joint/UL TCI state for PUSCH reception.
- operation #1 may be applied to some PUSCH receptions. Specifically, operation #1 may be applied only to PUSCHs corresponding to a specific CORESET.
- the specific CORESET may be at least one of a CORESET with only USS/only CSS/both CSS and USS, a CORESET with/without CORESET0, a CORESET with followUnifiedTCIState set, and a CORESET with followUnifiedTCIState not set.
- operation #1 may be applied only in a specific DCI format.
- the specific DCI format may be at least one of DCI format 0_1/0_2 including a TCI status field/new DCI field, DCI format 0_1/0_2 not including a TCI status field/new DCI field, and DCI format 0_0.
- the UE may apply both of the two indication joint/UL TCI states or one of the two indication joint/UL TCI states for PDSCH reception.
- operation #2 may be applied to some PUSCH receptions.
- operation #2 may be applied only to PUSCHs corresponding to a specific CORESET.
- the specific CORESET may be at least one of a CORESET with only USS/only CSS/both CSS and USS, a CORESET with/without CORESET0, a CORESET with followUnifiedTCIState set, and a CORESET with followUnifiedTCIState not set.
- operation #2 may be applied only in a specific DCI format.
- the specific DCI format may be at least one of DCI format 0_1/0_2 including a TCI status field/new DCI field, DCI format 0_1/0_2 not including a TCI status field/new DCI field, and DCI format 0_0.
- Whether the UE applies any of the above-mentioned actions #1/#2, i.e., whether the UE applies one/two indication joint/UL TCI states, may be set/instructed/switched based on any of the conditions (options 1-3, conditions 1-7) shown in embodiment 1.1 above.
- the UE can appropriately control the mapping (application) of the indicated TCI state to PUSCH transmission.
- Embodiment 2.2 the application of the unified TCI state to SRS transmission is described.
- the contents of embodiment 1.2 described above can be applied to this embodiment by replacing "CSI-RS” with “SRS”.
- the contents of embodiment 2.1 can be applied to this embodiment by replacing "PUSCH” with “SRS”. Therefore, overlapping descriptions will be omitted as appropriate, and differences will be mainly described.
- the UE may apply the indication joint/UL TCI state corresponding to the notified index to each SRS resource (set).
- the UE may apply one indication joint/UL TCI state to the SRS resource (set) for which followUnifiedTCISRS_R18 is set, regardless of the value set by higher layer signaling.
- the UE may apply the one indicated joint/UL TCI state for SRS transmission.
- operation #1 may be applied to some SRS transmissions. Specifically, it may be restricted based on the type of SRS (periodic/semi-persistent/non-periodic). For example, in the case of non-periodic SRS, operation #1 may be applied only in non-periodic SRS scheduled/triggered by a specific CORESET.
- the specific CORESET may be at least one of a CORESET with USS only/CSS only/both CSS and USS, a CORESET with/without CORESET0, a CORESET with followUnifiedTCIState set, and a CORESET with followUnifiedTCIState not set.
- operation #1 may be applied only to aperiodic SRS triggered by a specific DCI format.
- the specific DCI format may be at least one of DCI format 0_1/0_2 including a TCI status field/new DCI field, DCI format 0_1/0_2 not including a TCI status field/new DCI field, and DCI format 0_0.
- operation #1 may be applied only to a specific SRS resource (set).
- followUnifiedTCI may be set as a parameter having two values such as ⁇ 1st, 2nd ⁇ , rather than as a single bit.
- FollowUnifiedTCI may also be set to one bit.
- whether to apply one of the indication joint/UL TCI states ⁇ 1st, 2nd ⁇ may be based on a value set for each SRS resource (set) by higher layer signaling.
- the UE may determine the indication joint/UL TCI state to apply based on the TRP (CORESETPoolIndex, one/two indication joint/UL TCI states) to which the triggering DCI corresponds.
- the UE may apply both of the two indication joint/UL TCI states or one of the two indication joint/UL TCI states for SRS reception.
- operation #2 may be limited/restricted.
- the conditions may be the same as operation #1 described above.
- operation #2 may be applied to some SRS receptions. Specifically, it may be restricted based on the type of SRS (periodic/semi-persistent/non-periodic). For example, in the case of non-periodic SRS, operation #2 may be applied only in non-periodic SRS scheduled/triggered by a specific CORESET.
- the specific CORESET may be at least one of a CORESET with USS only/CSS only/both CSS and USS, a CORESET with/without CORESET0, a CORESET with followUnifiedTCIState set, and a CORESET with followUnifiedTCIState not set.
- operation #2 may be applied only to aperiodic SRS triggered by a specific DCI format.
- the specific DCI format may be at least one of DCI format 0_1/0_2 including a TCI status field/new DCI field, DCI format 0_1/0_2 not including a TCI status field/new DCI field, and DCI format 0_0.
- operation #2 may be applied only to a specific SRS resource (set).
- Whether the UE applies any of the above-mentioned operations #1/#2, i.e., whether the UE applies one/two indication joint/UL TCI states, may be set/indicated/switched based on any of the above-mentioned conditions (options 1-3).
- "PUSCH" in options 1-3 may be read as "SRS”. Note that, when based on the new DCI field of option 1, the UE does not need to control the indication joint/UL TCI state for aperiodic SRS.
- condition 1-7) in the above-mentioned embodiment 2.1 can be applied to this embodiment by replacing "PUSCH” with "SRS.”
- the above-mentioned specific conditions/rules may be set by higher layer signaling.
- the RRC/MAC CE may indicate whether one/two indication joint/UL TCI states are applicable, and the UE may determine the number of indication joint/UL TCI states to apply according to the indication.
- the specific conditions/rules set by higher layer signaling may be specific conditions/rules set for a certain CORESET/PDSCH/PUSCH, or specific conditions/rules set for a certain SRS.
- one of ⁇ 1st, 2nd, both ⁇ may be configured for each SRS resource (set).
- the UE may apply the corresponding indication joint/UL TCI state for SRS reception.
- aperiodic SRS which of ⁇ 1st, 2nd ⁇ to apply may be controlled by a trigger DCI.
- the indication joint/DL TCI state for aperiodic SRS may be indicated using a field indicating either ⁇ 1st, 2nd, both ⁇ for PDSCH/PUSCH. For example, when ⁇ both ⁇ is set for SRS, the UE may select one (1st/2nd) indication joint/UL TCI state based on higher layer signaling/predetermined rules.
- the UE may apply one indicated joint/UL TCI state to a certain SRS resource (set).
- a case where multi-TRP/SFN is not set may be added as an application condition.
- One indicated joint/UL TCI state may be set/indicated based on any of the above-mentioned rules.
- the UE may determine the indicated joint/UL TCI state based on a predetermined rule. For example, the UE may always apply the first/second indicated TCI state.
- the UE can appropriately control the mapping (application) of the indicated TCI state to SRS transmission.
- Embodiment 2.3 application of the unified TCI state to PUCCH transmission will be described.
- the contents of embodiment 1.3 described above can be applied to this embodiment by replacing "PDCCH” with "PUCCH”. Therefore, overlapping descriptions will be omitted as appropriate, and differences will be mainly described.
- the UE may apply the one indicated joint/UL TCI state for PUCCH transmission.
- operation #1 may be applied to some PUCCH transmissions.
- operation #1 may be applied only to PUCCHs that are supported by a specific CORESET.
- the specific CORESET may be at least one of a CORESET with only USS/only CSS/both CSS and USS, a CORESET with/without CORESET0, a CORESET with followUnifiedTCIState set, and a CORESET with followUnifiedTCIState not set.
- operation #1 may be applied only in a CORESET that transmits a specific DCI format.
- the specific DCI format may be at least one of DCI format 0_1/0_2 including a TCI status field/new DCI field, DCI format 0_1/0_2 not including a TCI status field/new DCI field, and DCI format 0_0.
- the followUnifiedTCI set in CORESET may be set as a parameter having three values such as ⁇ 1st, 2nd, both ⁇ , rather than as a single bit.
- followUnifiedTCI may be set to one bit. In this case, whether to apply one of the indication joint/UL TCI states ⁇ 1st, 2nd, both ⁇ may be based on the value set for each CORESET by higher layer signaling.
- the UE may apply both of the two indication joint/UL TCI states or one of the two indication joint/UL TCI states for PUCCH transmission.
- condition under which action #2 is applied may be limited/restricted.
- the conditions may be the same as those for action #1 described above.
- Whether the UE applies any of the above-mentioned operations #1/#2, i.e., whether the UE applies one/two indication joint/UL TCI states, may be set/indicated/switched based on any of the above-mentioned conditions (options 1-3).
- “PDCCH” in options 1-3 may be read as "PUCCH”. Note that, when based on the new DCI field of option 1, the UE does not need to control the indication joint/UL TCI state for PUCCH.
- condition 1-7) in the above-mentioned embodiment 1.3 can be applied to this embodiment by replacing "PDCCH" with "PUCCH”.
- the specific conditions/rules set by higher layer signaling can also be similarly replaced and applied.
- the UE can appropriately control the mapping (application) of the indicated TCI state for PUCCH transmission.
- the UE can appropriately control the mapping (application) of the indicated TCI state to the uplink channel (e.g., PUSCH)/signal (RS).
- the uplink channel e.g., PUSCH
- RS signal
- the UE may determine the application of the indication joint/UL TCI state based on at least one of the following: If two indicated joint/UL TCI states are indicated, determine which indicated joint/UL TCI state to apply based on the above settings. When one indicated joint/UL TCI state is indicated, the indicated joint/UL TCI state to be applied may be determined regardless of the above-mentioned settings, or the indicated joint/UL TCI state to be applied may be determined based on the above-mentioned settings.
- the UE may apply the indicated indicated joint/UL TCI state.
- the UE may determine this as an error. In other words, the UE may not assume that ⁇ 2nd ⁇ is indicated when one indicated joint/UL TCI state is indicated, or may not apply the indicated indicated joint/UL TCI state.
- the operation of the above embodiment may be applied to at least one of the conditions listed below, and may not be applied to other cases.
- the indicated TCI state corresponds to the PCI of the serving cell; At least a portion of the plurality of indicated TCI states corresponds to the PCI of the serving cell;
- the indicated TCI state corresponds to an additional PCI (a PCI other than the PCI of the serving cell), At least some of the multiple indicated TCI states correspond to additional PCIs (PCIs other than the PCI of the serving cell).
- any information may be notified to the UE (from a network (NW) (e.g., a base station (BS))) (in other words, any information is received from the BS by the UE) using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.
- NW network
- BS base station
- the MAC CE may be identified by including a new Logical Channel ID (LCID) in the MAC subheader that is not specified in existing standards.
- LCID Logical Channel ID
- the notification When the notification is made by a DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.
- RNTI Radio Network Temporary Identifier
- CRC Cyclic Redundancy Check
- notification of any information to the UE in the above-mentioned embodiments may be performed periodically, semi-persistently, or aperiodically.
- notification of any information from the UE (to the NW) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.
- physical layer signaling e.g., UCI
- higher layer signaling e.g., RRC signaling, MAC CE
- a specific signal/channel e.g., PUCCH, PUSCH, PRACH, reference signal
- the MAC CE may be identified by including a new LCID in the MAC subheader that is not specified in existing standards.
- the notification may be transmitted using PUCCH or PUSCH.
- notification of any information from the UE may be performed periodically, semi-persistently, or aperiodically.
- At least one of the above-mentioned embodiments may be applied when a specific condition is satisfied, which may be specified in a standard or may be notified to a UE/BS using higher layer signaling/physical layer signaling.
- At least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.
- the specific UE capabilities may indicate at least one of the following: Supporting specific processing/operations/control/information for at least one of the above embodiments (e.g. switching between single-TRP and multi-TRP when using unified TCI states); - Support single TRP/multi-TRP switching to be notified via scheduling DCI.
- the above-mentioned specific UE capabilities may be capabilities that are applied across all frequencies (commonly regardless of frequency), capabilities per frequency (e.g., one or a combination of a cell, band, band combination, BWP, component carrier, etc.), capabilities per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), capabilities per subcarrier spacing (SubCarrier Spacing (SCS)), or capabilities per Feature Set (FS) or Feature Set Per Component-carrier (FSPC).
- FR1 Frequency Range 1
- FR2 FR2, FR3, FR4, FR5, FR2-1, FR2-2
- SCS subcarrier Spacing
- FS Feature Set
- FSPC Feature Set Per Component-carrier
- the specific UE capabilities may be capabilities that are applied across all duplexing methods (commonly regardless of the duplexing method), or may be capabilities for each duplexing method (e.g., Time Division Duplex (TDD) and Frequency Division Duplex (FDD)).
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- the above-mentioned embodiments may be applied when the UE configures/activates/triggers specific information related to the above-mentioned embodiments (or performs the operations of the above-mentioned embodiments) by higher layer signaling/physical layer signaling.
- the specific information may be information indicating that single TRP/multi-TRP switching is enabled, any RRC parameters for a specific release (e.g., Rel. 18/19), etc.
- the UE may, for example, apply Rel. 15/16 operations.
- TCI Transmission Configuration Indication
- the DL channel is either a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH),
- the terminal according to claim 1 wherein the DL reference signal is a channel state information reference signal (CSI-RS).
- CSI-RS channel state information reference signal
- the control unit determines the number of designated TCI states to apply to reception of the DL channel or the DL reference signal based on a specific condition.
- the specific conditions are: The DL channel or the DL reference signal is scheduled or triggered by a specific control resource set (CORESET); A Single Frequency Network (SFN) is set for the CORESET; The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein at least one of a single DCI-based multiple transmission/reception point (TRP) is configured.
- CORESET specific control resource set
- SFN Single Frequency Network
- [Appendix 1] a transmitter for transmitting at least one of an uplink (UL) channel and an UL reference signal scheduled or triggered by downlink control information (DCI); A terminal having a control unit that determines an indicated Transmission Configuration Indication (TCI) state to be applied to the transmission of the UL channel or the UL reference signal based on a unified Transmission Configuration Indication (TCI state) indicated by a specific field included in the DCI.
- the UL channel is either a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH); 2.
- the terminal of claim 1, wherein the UL reference signal is a measurement reference signal (SRS).
- SRS measurement reference signal
- Appendix 3 The terminal according to claim 1 or 2, wherein the control unit determines the number of indicated TCI states to apply to reception of the UL channel or the UL reference signal based on a specific condition.
- the specific conditions are: The UL channel or the UL reference signal is associated with a specific control resource set (CORESET); A Single Frequency Network (SFN) is set for the CORESET; The terminal according to any one of Supplementary Note 1 to Supplementary Note 3, wherein at least one of a single DCI-based multiple transmission/reception point (TRP) is configured.
- CORESET specific control resource set
- SFN Single Frequency Network
- Wired 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 wireless communication methods according to the above embodiments of the present disclosure or a combination of these.
- FIG. 10 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- the wireless communication system 1 (which may simply be referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) specified by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.
- LTE Long Term Evolution
- 3GPP Third Generation Partnership Project
- 5G NR 5th generation mobile communication system New Radio
- the wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.
- RATs Radio Access Technologies
- MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.
- E-UTRA 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 may support dual connectivity between multiple base stations within the same RAT (e.g., dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).
- dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).
- gNBs NR base stations
- N-DC Dual Connectivity
- the wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged within the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1.
- a user terminal 20 may be located within at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.
- the user terminal 20 may be connected to at least one of the multiple base stations 10.
- the user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)).
- Macro cell C1 may be included in FR1
- 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
- the multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication).
- wire e.g., optical fiber conforming to the Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication e.g., NR communication
- base station 11 which corresponds to the upper station
- IAB Integrated Access Backhaul
- base station 12 which corresponds to a 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 at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the core network 30 may include network functions (Network Functions (NF)) such as, for example, a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM).
- NF Network Functions
- UPF User Plane Function
- AMF Access and Mobility management Function
- SMF Session Management Function
- UDM Unified Data Management
- AF Application Function
- DN Data Network
- LMF Location Management Function
- OAM Operation, Administration and Maintenance
- the user terminal 20 may be a terminal that supports at least one of the communication methods such as LTE, LTE-A, and 5G.
- a wireless access method 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
- the radio access method may also be called a waveform.
- other radio access methods e.g., other single-carrier transmission methods, other multi-carrier transmission methods
- a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- PDCCH Physical Downlink Control Channel
- an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- SIB System Information Block
- PDSCH User data, upper layer control information, System Information Block (SIB), etc.
- SIB System Information Block
- PUSCH User data, upper layer control information, etc.
- MIB Master Information Block
- PBCH Physical Broadcast Channel
- Lower layer control information may be transmitted by the PDCCH.
- the lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.
- DCI Downlink Control Information
- the DCI for scheduling the PDSCH may be called a DL assignment or DL DCI
- the DCI for scheduling the PUSCH may be called a UL grant or UL DCI.
- the PDSCH may be interpreted as DL data
- the PUSCH may be interpreted as UL data.
- a control resource set (COntrol REsource SET (CORESET)) and a search space may be used to detect the PDCCH.
- the CORESET corresponds to the resources to search for DCI.
- the search space corresponds to the search region and search method of PDCCH candidates.
- One CORESET may be associated with one or multiple search spaces. The UE may monitor the CORESET associated with a search space based on the search space configuration.
- a search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set. Note that the terms “search space,” “search space set,” “search space setting,” “search space set setting,” “CORESET,” “CORESET setting,” etc. in this disclosure may be read as interchangeable.
- the PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.), and a scheduling request (SR).
- UCI uplink control information
- CSI channel state information
- HARQ-ACK Hybrid Automatic Repeat reQuest ACKnowledgement
- ACK/NACK ACK/NACK
- SR scheduling request
- the PRACH may transmit a random access preamble for establishing a connection with a cell.
- downlink, uplink, etc. may be expressed without adding "link.”
- various channels may be expressed without adding "Physical” to the beginning.
- a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted.
- a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.
- the synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).
- a signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for PBCH) may be called an SS/PBCH block, an SS Block (SSB), etc.
- the SS, SSB, etc. may also be called a reference signal.
- a measurement reference signal Sounding Reference Signal (SRS)
- a demodulation reference signal DMRS
- UL-RS uplink reference signal
- DMRS may also be called a user equipment-specific reference signal (UE-specific Reference Signal).
- the base station 11 is a diagram showing an example of a configuration of a base station according to an embodiment.
- the base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.
- this example mainly shows the functional blocks of the characteristic parts of this embodiment, and the base station 10 may also be assumed to have other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.
- the control unit 110 controls the entire base station 10.
- the control unit 110 can be configured from a controller, a control circuit, etc., which are described based on a common understanding in the technical field to which this disclosure pertains.
- the control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc.
- the control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc.
- the control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120.
- the control unit 110 may perform call processing of communication channels (setting, release, etc.), status management of the base station 10, management of radio resources, etc.
- the transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123.
- the baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212.
- the transceiver unit 120 may be composed of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on a common understanding in the technical field to which the present disclosure relates.
- the transceiver unit 120 may be configured as an integrated transceiver unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122.
- the reception unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.
- the transmitting/receiving antenna 130 can be configured as an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.
- the transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc.
- the transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.
- the transceiver 120 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.
- digital beamforming e.g., precoding
- analog beamforming e.g., phase rotation
- the transceiver 120 may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc., on data and control information obtained from the control unit 110, and generate a bit string to be transmitted.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control HARQ retransmission control
- the transceiver 120 may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- channel coding which may include error correction coding
- DFT Discrete Fourier Transform
- IFFT Inverse Fast Fourier Transform
- the transceiver unit 120 may perform modulation, filtering, amplification, etc., on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.
- the transceiver unit 120 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.
- the transceiver 120 may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.
- reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.
- FFT Fast Fourier Transform
- IDFT Inverse Discrete Fourier Transform
- filtering demapping
- demodulation which may include error correction decoding
- MAC layer processing which may include error correction decoding
- the transceiver 120 may perform measurements on the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal.
- the measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc.
- RSRP Reference Signal Received Power
- RSSI Received Signal Strength Indicator
- the measurement results may be output to the control unit 110.
- the transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes providing NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.
- devices included in the core network 30 e.g., network nodes providing NF
- other base stations 10, etc. may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.
- the transmitter and receiver of the base station 10 in this disclosure may be configured with at least one of the transmitter/receiver 120, the transmitter/receiver antenna 130, and the transmission path interface 140.
- the transceiver 120 may transmit at least one of a downlink (DL) channel and a DL reference signal that are scheduled or triggered by downlink control information (DCI).
- the transceiver 120 may receive at least one of an uplink (UL) channel and a UL reference signal that are scheduled or triggered by downlink control information (DCI).
- DCI downlink control information
- the control unit 110 may control the terminal to transmit the DCI with a specific field indicating a unified TCI state in order to determine the instruction Transmission Configuration Indication (TCI state) to be applied to the reception of the DL channel or the DL reference signal.
- the control unit 110 may control the terminal to transmit the DCI with a specific field indicating a unified TCI state in order to determine the instruction Transmission Configuration Indication (TCI state) to be applied to the transmission of the UL channel or the UL reference signal.
- the user terminal 12 is a diagram showing an example of the configuration of a user terminal according to an embodiment.
- the user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the control unit 210, the transceiver unit 220, and the transceiver antenna 230 may each include one or more.
- this example mainly shows the functional blocks of the characteristic parts of this embodiment, and the user terminal 20 may also be assumed to have other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.
- the control unit 210 controls the entire user terminal 20.
- the control unit 210 can be configured from a controller, a control circuit, etc., which are described based on a common understanding in the technical field to which this disclosure pertains.
- the control unit 210 may control signal generation, mapping, etc.
- the control unit 210 may control transmission and reception using the transceiver unit 220 and the transceiver antenna 230, measurement, etc.
- the control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.
- the transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223.
- the baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212.
- the transceiver unit 220 may be composed of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on a common understanding in the technical field to which the present disclosure relates.
- the transceiver unit 220 may be configured as an integrated transceiver unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222.
- the reception unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.
- the transmitting/receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.
- the transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc.
- the transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.
- the transceiver unit 220 may form at least one of the transmit beam and the receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.
- digital beamforming e.g., precoding
- analog beamforming e.g., phase rotation
- the transceiver 220 may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data and control information acquired from the controller 210, and generate a bit string to be transmitted.
- RLC layer processing e.g., RLC retransmission control
- MAC layer processing e.g., HARQ retransmission control
- the transceiver 220 may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- Whether or not to apply DFT processing may be based on the settings of transform precoding.
- the transceiver unit 220 transmission processing unit 2211
- the transceiver unit 220 may perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, it is not necessary to perform DFT processing as the above-mentioned transmission processing.
- the transceiver unit 220 may perform modulation, filtering, amplification, etc., on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.
- the transceiver unit 220 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.
- the transceiver 220 may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.
- reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.
- the transceiver 220 may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal.
- the measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc.
- the measurement results may be output to the control unit 210.
- the measurement unit 223 may derive channel measurements for CSI calculation based on channel measurement resources.
- the channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources.
- the measurement unit 223 may derive interference measurements for CSI calculation based on interference measurement resources.
- the interference measurement resources may be at least one of NZP CSI-RS resources for interference measurement, CSI-Interference Measurement (IM) resources, etc.
- CSI-IM may be called CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS.
- CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be read as interchangeable.
- the transmitting unit and receiving unit of the user terminal 20 in this disclosure may be configured by at least one of the transmitting/receiving unit 220 and the transmitting/receiving antenna 230.
- the transceiver 220 may receive at least one of a downlink (DL) channel and a DL reference signal that are scheduled or triggered by downlink control information (DCI).
- the DL channel may be either a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH), and the DL reference signal may be a channel state information reference signal (CSI-RS).
- PDSCH physical downlink shared channel
- PDCCH physical downlink control channel
- CSI-RS channel state information reference signal
- the transceiver 220 may transmit at least one of an uplink (UL) channel and an UL reference signal scheduled or triggered by downlink control information (DCI).
- the UL channel may be either a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH), and the UL reference signal may be a measurement reference signal (SRS).
- PUSCH physical uplink shared channel
- PUCCH physical uplink control channel
- SRS measurement reference signal
- the control unit 210 may determine the indicated TCI state to be applied to the reception of the DL channel or the DL reference signal based on a unified Transmission Configuration Indication (TCI state) indicated by a specific field included in the DCI.
- TCI state Transmission Configuration Indication
- the control unit 210 may determine the number of indicated TCI states to be applied to the reception of the DL channel or the DL reference signal based on a specific condition.
- the specific condition may be at least one of the following: the DL channel or the DL reference signal is scheduled or triggered by a specific control resource set (CORESET), a single frequency network (SFN) is configured for the CORESET, and a single DCI-based multiple transmission/reception point (TRP) is configured.
- CORESET specific control resource set
- SFN single frequency network
- TRP transmission/reception point
- the control section 210 may determine the indicated TCI state to be applied to the transmission of the UL channel or the UL reference signal based on a unified Transmission Configuration Indication (TCI state) indicated by a specific field included in the DCI.
- TCI state Transmission Configuration Indication
- the control section 210 may determine the number of indicated TCI states to be applied to the reception of the UL channel or the UL reference signal based on a specific condition.
- the specific condition may be at least one of the following: the UL channel or the UL reference signal is associated with a specific control resource set (CORESET), a Single Frequency Network (SFN) is set for the CORESET, and a single DCI-based multiple transmission/reception point (TRP) is set.
- CORESET specific control resource set
- SFN Single Frequency Network
- TRP transmission/reception point
- each functional block may be realized using one device that is physically or logically coupled, or may be realized using two or more devices that are physically or logically separated and directly or indirectly connected (for example, using wires, wirelessly, etc.).
- the functional blocks may be realized by combining the one device or the multiple devices with software.
- the functions include, but are not limited to, judgement, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment.
- a functional block (component) that performs the transmission function may be called a transmitting unit, a transmitter, and the like. In either case, as mentioned above, there are no particular limitations on the method of realization.
- a base station, a user terminal, etc. in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 13 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment.
- the above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.
- the terms apparatus, circuit, device, section, unit, etc. may be interpreted as interchangeable.
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figures, or may be configured to exclude some of the devices.
- processor 1001 may be implemented by one or more chips.
- the functions of the base station 10 and the user terminal 20 are realized, for example, by loading specific software (programs) onto hardware such as the processor 1001 and memory 1002, causing the processor 1001 to perform calculations, control communications via the communication device 1004, and control at least one of the reading and writing of data in the memory 1002 and storage 1003.
- the processor 1001 for example, runs an operating system to control the entire computer.
- the processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, etc.
- CPU central processing unit
- control unit 110 210
- transmission/reception unit 120 220
- etc. may be realized by the processor 1001.
- the processor 1001 also reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
- the programs used are those that cause a computer to execute at least some of the operations described in the above embodiments.
- the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and similar implementations may be made for other functional blocks.
- Memory 1002 is a computer-readable recording medium and may be composed of at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other suitable storage media. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to one embodiment of the present disclosure.
- ROM Read Only Memory
- EPROM Erasable Programmable ROM
- EEPROM Electrically EPROM
- RAM Random Access Memory
- Memory 1002 may also be called a register, cache, main memory, etc.
- Memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to one embodiment of the present disclosure.
- Storage 1003 is a computer-readable recording medium and may be composed of at least one of a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium.
- Storage 1003 may also be referred to as an auxiliary storage device.
- 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, for example, a network device, a network controller, a network card, or a communication module.
- the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- the above-mentioned transmitting/receiving unit 120 (220), transmitting/receiving antenna 130 (230), etc. may be realized by the communication device 1004.
- the transmitting/receiving unit 120 (220) may be implemented as a transmitting unit 120a (220a) and a receiving unit 120b (220b) that are physically or logically separated.
- the input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside.
- the output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside.
- the input device 1005 and the output device 1006 may be integrated into one structure (e.g., a touch panel).
- each device such as the processor 1001 and memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses between each device.
- the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using the hardware.
- the processor 1001 may be implemented using at least one of these pieces of hardware.
- a channel, a symbol, and a signal may be read as mutually interchangeable.
- a signal may also be a message.
- a reference signal may be abbreviated as RS, and may be called a pilot, a pilot signal, or the like depending on the applied standard.
- a component carrier may also be called a cell, a frequency carrier, a carrier frequency, or the like.
- a radio frame may be composed of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting a radio frame may be called a subframe.
- a subframe may be composed of one or more slots in the time domain.
- a subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.
- the numerology may be a communication parameter that is applied to at least one of the transmission and reception of a signal or channel.
- the numerology may indicate, for example, at least one of the following: SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame configuration, a specific filtering process performed by the transceiver in the frequency domain, a specific windowing process performed by the transceiver in the time domain, etc.
- SCS SubCarrier Spacing
- TTI Transmission Time Interval
- radio frame configuration a specific filtering process performed by the transceiver in the frequency domain
- a specific windowing process performed by the transceiver in the time domain etc.
- a slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.).
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may also be a time unit based on numerology.
- a slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A.
- a PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.
- a radio frame, a subframe, a slot, a minislot, and a symbol all represent time units when transmitting a signal.
- a different name may be used for a radio frame, a subframe, a slot, a minislot, and a symbol, respectively.
- the time units such as a frame, a subframe, a slot, a minislot, and a symbol in this disclosure may be read as interchangeable.
- one subframe may be called a TTI
- multiple consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI.
- at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms.
- the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.
- TTI refers to, for example, the smallest time unit for scheduling in wireless communication.
- a base station schedules each user terminal by allocating radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) in TTI units.
- radio resources such as frequency bandwidth and transmission power that can be used by each user terminal
- the TTI may be a transmission time unit for a channel-coded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc.
- the time interval e.g., the number of symbols
- the time interval in which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum time unit of scheduling.
- the number of slots (minislots) that constitute the minimum time unit of 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, etc.
- a TTI shorter than a normal TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.
- a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms
- a short TTI e.g., a shortened TTI, etc.
- TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain.
- the number of subcarriers included in an RB may be the same regardless of numerology, and may be, for example, 12.
- the number of subcarriers included in an RB may be determined based on numerology.
- an RB may include one or more symbols in the time domain and may be one slot, one minislot, one subframe, or one TTI in length.
- One TTI, one subframe, etc. may each be composed of one or more resource blocks.
- one or more RBs may be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.
- PRB Physical RB
- SCG sub-carrier Group
- REG resource element group
- PRB pair an RB pair, etc.
- a resource block may be composed of one or more resource elements (REs).
- REs resource elements
- one RE may be a radio resource area of one subcarrier and one symbol.
- a Bandwidth Part which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by an index of the RB relative to a common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within the BWP.
- the BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL).
- BWP UL BWP
- BWP for DL DL BWP
- One or more 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 signal/channel outside the active BWP.
- BWP bitmap
- radio frames, subframes, slots, minislots, and symbols are merely examples.
- the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, as well as the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.
- the information, parameters, etc. described in this disclosure may be represented using absolute values, may be represented using relative values from a predetermined value, or may be represented using other corresponding information.
- a radio resource may be indicated by a predetermined index.
- the names used for parameters and the like in this disclosure are not limiting in any respect. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure.
- the various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any respect.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies.
- the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.
- information, signals, etc. may be output from a higher layer to a lower layer and/or from a lower layer to a higher layer.
- Information, signals, etc. may be input/output via multiple network nodes.
- Input/output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input/output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.
- a specific location e.g., memory
- Input/output information, signals, etc. may be overwritten, updated, or added to.
- Output information, signals, etc. may be deleted.
- Input information, signals, etc. may be transmitted to another device.
- the notification of information is not limited to the aspects/embodiments described in this disclosure, and may be performed using other methods.
- the notification of information in this disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals, or a combination of these.
- DCI Downlink Control Information
- UCI Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), etc.
- the RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.
- the MAC signaling may be notified, for example, using a MAC Control Element (CE).
- CE MAC Control Element
- notification of specified information is not limited to explicit notification, but may be implicit (e.g., by not notifying the specified information or by notifying other information).
- the determination may be based on a value represented by a single bit (0 or 1), a Boolean value represented by true or false, or a comparison of numerical values (e.g., with a predetermined value).
- Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
- Software, instructions, information, etc. may also be transmitted and received via a transmission medium.
- a transmission medium For example, if the software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and/or wireless technologies (such as infrared, microwave, etc.), then at least one of these wired and wireless technologies is included within the definition of a transmission medium.
- wired technologies such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)
- wireless technologies such as infrared, microwave, etc.
- Network may refer to the devices included in the network (e.g., base stations).
- the antenna port may be interchangeably read as an antenna port for any signal/channel (e.g., a demodulation reference signal (DMRS) port).
- the resource may be interchangeably read as a resource for any signal/channel (e.g., a reference signal resource, an SRS resource, etc.).
- the resource may include time/frequency/code/space/power resources.
- the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.
- the above groups may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, etc.
- CDM Code Division Multiplexing
- RS Reference Signal
- CORESET Control Resource Set
- beam SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable.
- SRI SRS Resource Indicator
- CORESET CORESET pool
- PDSCH PUSCH
- codeword CW
- TB transport block
- RS etc.
- TCI state downlink TCI state
- DL TCI state downlink TCI state
- UL TCI state uplink TCI state
- unified TCI state common TCI state
- joint TCI state etc.
- QCL QCL
- QCL assumptions QCL relationship
- QCL type information QCL property/properties
- specific QCL type e.g., Type A, Type D
- specific QCL type e.g., Type A, Type D
- index identifier
- indicator indication, resource ID, etc.
- sequence list, set, group, cluster, subset, etc.
- TCI state ID may be interchangeable.
- TCI state ID may be interchangeable as “set of spatial relationship information (TCI state)", “one or more pieces of spatial relationship information”, etc.
- TCI state and TCI may be interchangeable.
- Spatial relationship information and spatial relationship may be interchangeable.
- Base Station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.
- a base station can accommodate one or more (e.g., three) cells.
- a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))).
- RRH Remote Radio Head
- the term "cell” or “sector” refers to a part or the entire coverage area of at least one of the base station and base station subsystems that provide communication services in this coverage.
- a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control/operate based on the information.
- MS Mobile Station
- UE User Equipment
- a mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc.
- at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.
- the moving body in question refers to an object that can move, and the moving speed is arbitrary, and of course includes the case where the moving body is stationary.
- the moving body in question includes, but is not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, balloons, and objects mounted on these.
- the moving body in question may also be a moving body that moves autonomously based on an operating command.
- the moving object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned).
- a vehicle e.g., a car, an airplane, etc.
- an unmanned moving object e.g., a drone, an autonomous vehicle, etc.
- a robot manned or unmanned
- at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations.
- at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- FIG. 14 is a diagram showing an example of a vehicle according to an embodiment.
- the vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.
- various sensors including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58
- an information service unit 59 including a communication module 60.
- the drive unit 41 is composed of at least one of an engine, a motor, and a hybrid of an engine and a motor, for example.
- the steering unit 42 includes at least a steering wheel (also called a handlebar), and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.
- the electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (e.g., an Input/Output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle.
- the electronic control unit 49 may also be called an Electronic Control Unit (ECU).
- ECU Electronic Control Unit
- Signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the motor current, a rotation speed signal of the front wheels 46/rear wheels 47 acquired by a rotation speed sensor 51, an air pressure signal of the front wheels 46/rear wheels 47 acquired by an air pressure sensor 52, a vehicle speed signal acquired by a vehicle speed sensor 53, an acceleration signal acquired by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 acquired by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 acquired by a brake pedal sensor 56, an operation signal of the shift lever 45 acquired by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 58.
- the information service unit 59 is composed of various devices, such as a car navigation system, audio system, speakers, displays, televisions, and radios, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs that control these devices.
- the information service unit 59 uses information acquired from external devices via the communication module 60, etc., to provide various information/services (e.g., multimedia information/multimedia services) to the occupants of the vehicle 40.
- various information/services e.g., multimedia information/multimedia services
- the information service unit 59 may include input devices (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accept input from the outside, and may also include output devices (e.g., a display, a speaker, an LED lamp, a touch panel, etc.) that perform output to the outside.
- input devices e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.
- output devices e.g., a display, a speaker, an LED lamp, a touch panel, etc.
- the driving assistance system unit 64 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving load, such as a millimeter wave radar, a Light Detection and Ranging (LiDAR), a camera, a positioning locator (e.g., a Global Navigation Satellite System (GNSS)), map information (e.g., a High Definition (HD) map, an Autonomous Vehicle (AV) map, etc.), a gyro system (e.g., an Inertial Measurement Unit (IMU), an Inertial Navigation System (INS), etc.), an Artificial Intelligence (AI) chip, and an AI processor, and one or more ECUs that control these devices.
- the driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize a driving assistance function or an autonomous driving function.
- the communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63.
- the communication module 60 transmits and receives data (information) via the communication port 63 between the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58 that are provided on the vehicle 40.
- the communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication.
- the communication module 60 may be located either inside or outside the electronic control unit 49.
- the external device may be, for example, the above-mentioned base station 10 or user terminal 20.
- the communication module 60 may also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it may function as at least one of the base station 10 and user terminal 20).
- the communication module 60 may transmit at least one of the signals from the various sensors 50-58 described above input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication.
- the electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input.
- the PUSCH transmitted by the communication module 60 may include information based on the above input.
- the communication module 60 receives various information (traffic information, signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle.
- the information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH (or data/information decoded from the PDSCH) received by the communication module 60).
- the communication module 60 also stores various information received from external devices in memory 62 that can be used by the microprocessor 61. Based on the information stored in memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided on the vehicle 40.
- the base station in the present disclosure may be read as a user terminal.
- each aspect/embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- the user terminal 20 may be configured to have the functions of the base station 10 described above.
- terms such as "uplink” and "downlink” may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink").
- the uplink channel, downlink channel, etc. may be read as the sidelink channel.
- the user terminal in this disclosure may be interpreted as a base station.
- the base station 10 may be configured to have the functions of the user terminal 20 described above.
- operations that are described as being performed by a base station may in some cases be performed by its upper node.
- a network that includes one or more network nodes having base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) or a Serving-Gateway (S-GW)), or a combination of these.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect/embodiment described in this disclosure may be used alone, in combination, or switched between depending on the implementation.
- the processing procedures, sequences, flow charts, etc. of each aspect/embodiment described in this disclosure may be rearranged as long as there is no inconsistency.
- the methods described in this disclosure present elements of various steps using an exemplary order, and are not limited to the particular order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- 4th generation mobile communication system 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG x is, for example, an integer or decimal
- Future Radio Access FX
- GSM Global System for Mobile communications
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi
- IEEE 802.16 WiMAX (registered trademark)
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth (registered trademark), and other appropriate wireless communication methods, as well as next-generation systems that are expanded, modified,
- the phrase “based on” does not mean “based only on,” unless expressly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- any reference to elements using designations such as “first,” “second,” etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.
- determining may encompass a wide variety of actions. For example, “determining” may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking in a table, database, or other data structure), ascertaining, etc.
- Determining may also be considered to mean “determining” receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.
- judgment (decision) may be considered to mean “judging (deciding)” resolving, selecting, choosing, establishing, comparing, etc.
- judgment (decision) may be considered to mean “judging (deciding)” some kind of action.
- judgment (decision) may be interpreted interchangeably with the actions described above.
- expect may be read as “be expected”.
- "expect(s)" ("" may be expressed, for example, as a that clause, a to infinitive, etc.) may be read as “be expected".
- "does not expect" may be read as "be not expected".
- "An apparatus A is not expected" may be read as "An apparatus B other than apparatus A does not expect" (for example, if apparatus A is a UE, apparatus B may be a base station).
- the "maximum transmit power" referred to in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.
- connection and “coupled,” or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other.
- the coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected” may be read as "accessed.”
- a and B are different may mean “A and B are different from each other.”
- the term may also mean “A and B are each different from C.”
- Terms such as “separate” and “combined” may also be interpreted in the same way as “different.”
- timing, time, duration, time instance, any time unit e.g., slot, subslot, symbol, subframe
- occasion, resource etc.
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Abstract
Description
NRでは、送信設定指示状態(Transmission Configuration Indication state(TCI状態))に基づいて、信号及びチャネルの少なくとも一方(信号/チャネルと表現する)のUEにおける受信処理(例えば、受信、デマッピング、復調、復号の少なくとも1つ)、送信処理(例えば、送信、マッピング、プリコーディング、変調、符号化の少なくとも1つ)を制御することが検討されている。
UEは、そのUEと、与えられたサービングセルと、を目的するDCIを伴う検出されたPDCCHに従って、PDSCHの復号のための上位レイヤパラメータPDSCH-Config内のM個までのTCI-State(TCI状態)設定のリストを設定されることができる。ここで、Mは、UE能力maxNumberConfiguredTCIstatesPerCCに依存する。
- 'typeA':{Doppler shift,Doppler spread,average delay,delay spread}
- 'typeB':{Doppler shift,Doppler spread}
- 'typeC':{Doppler shift,average delay}
- 'typeD':{Spatial Rx parameter}
TCI-State(TCI状態)は、1つ又は2つのDL参照信号(RS)を、対応するQCLタイプに関連付ける。もしそのRSに対して追加physical cell identifier(PCI)が設定される場合、両方のDL RSに対して同じ値が設定される。
Rel.16において、PDSCHは、TCIフィールドを有するDCIでスケジュールされてもよい。PDSCHのためのTCI状態は、TCIフィールドによって指示される。DCIフォーマット1_1のTCIフィールドは3ビットであり、DCIフォーマット1_2のTCIフィールドは最大3ビットである。
統一TCIフレームワークによれば、複数種類(UL/DL)のチャネル/RSを共通のフレームワークによって制御できる。統一TCIフレームワークは、Rel.15のようにTCI状態又は空間関係をチャネルごとに規定するのではなく、共通ビーム(共通TCI状態)を指示し、それをUL及びDLの全てのチャネルへ適用してもよいし、UL用の共通ビームをULの全てのチャネルに適用し、DL用の共通ビームをDLの全てのチャネルに適用してもよい。
あるCC内のPDSCHのDMRS及びPDCCHのDMRSと、CSI-RSと、のための参照信号を提供するために、さらに、もし、あるCC内の動的グラント及び設定グラントベースのPUSCH及びPUCCHリソースと、SRSと、のためのUL TX(送信)空間フィルタが利用可能である場合、そのUL TCIフィルタの決定のための参照を提供するために、PDSCH-Config(PDSCH設定)内において、UEは、128個までのDLorJointTCIState(DL又はジョイントのTCI状態)設定のリストを設定されることができる。
Rel.17統一TCIフレームワークは、以下のモード1から3をサポートする。
[モード1]MAC CEベースTCI状態指示(MAC CE based TCI state indication)
[モード2]DLアサインメントを伴うDCIベースTCI状態指示(DCI based TCI state indication by DCI format 1_1/1_2 with DL assignment)
[モード3]DLアサインメントを伴わないDCIベースTCI状態指示(DCI based TCI state indication by DCI format 1_1/1_2 without DL assignment)
- CS-RNTIがDCIのためのCRCのスクランブルに用いられる。
- 以下のDCIフィールド(特別フィールド)の値が以下のようにセットされる:
- redundancy version(RV)フィールドがall '1's。
- modulation and coding scheme(MCS)フィールドがall '1's。
- new data indicator(NDI)フィールドが0。
- frequency domain resource assignment(FDRA)フィールドが、FDRAタイプ0に対してall '0's、又は、FDRAタイプ1に対してall '1's、又は、ダイナミックスイッチ(DynamicSwitch)に対してall '0's(DL semi-persistent scheduling(SPS)又はULグラントタイプ2スケジューリングのリリースのPDCCHの検証(validation)と同様)。
[動作]もしそのDCIフォーマット1_1を伝達するPDCCHに用いられるCORESETに対して上位レイヤパラメータtci-PresentInDCIが有効にされない場合、UEは、指示されたBWP内の全てのCORESETに対してtci-PresentInDCIが有効にされないと想定し、そうでない場合、UEは、指示されたBWP内の全てのCORESETに対してtci-PresentInDCIが有効にされると想定する。
[動作]もしそのDCIフォーマット1_2を伝達するPDCCHに用いられるCORESETに対して上位レイヤパラメータtci-PresentInDCI-1-2が設定されない場合、UEは、指示されたBWP内の全てのCORESETに対してtci-PresentInDCIが有効にされないと想定し、そうでない場合、UEは、指示されたBWP内の全てのCORESETに対してtci-PresentInDCI-1-2が、そのDCIフォーマット1_2を伝達するPDCCHに用いられるCORESETに対して設定されたtci-PresentInDCI-1-2と同じ値を伴って設定されると想定する。
Rel.17TCI状態について、統一/共通TCI状態は、(Rel.17の)DCI/MAC CE/RRCを用いて指示されるRel.17TCI状態(指示Rel.17TCI状態(indicated Rel.17 TCI state))を意味してもよい。
MAC CE/DCIによる指示TCI状態("indicated TCI state")は、以下のチャネル/RSに適用されてもよい。
・CORESET0に対し、followUnifiedTCIState(統一TCI状態に従うこと)が設定された場合、指示TCI状態が適用される。そうでない場合、そのCORESETに対し、Rel.15仕様が適用される。すなわち、CORESET0は、MAC CEによってアクティベートされたTCI状態に従う、又は、SSBとQCLされる。
・USS/CSSタイプ3を伴う、インデックス0以外のCORESETに対し、常に指示TCI状態が適用される。
・少なくともCSSタイプ3以外のCSSを伴う、インデックス0以外のCORESETに対し、統一TCI状態に従うことが設定された場合、指示TCI状態が適用される。そうでない場合、そのCORESETに対する設定TCI状態("configured TCI state")が、そのCORESETに適用される。
・全てのUE個別(UE-dedicated)PDSCHに対し、常に指示TCI状態が適用される。
・非UE個別(non-UE-dedicated)PDSCH(CSS内のDCIによってスケジュールされたPDSCH)に対し、(そのPDSCHをスケジュールするPDCCHのCORESETに対して)followUnifiedTCIStateが設定された場合、指示TCI状態が適用されてもよい。そうでない場合、そのPDSCHに対する設定TCI状態が、そのPDSCHに適用される。PDSCHに対し、followUnifiedTCIStateが設定されない場合、非UE個別PDSCHが指示TCI状態に従うかどうかが、そのPDSCHのスケジューリングに用いられたCORESETに対し、followUnifiedTCIStateが設定されたか否かに応じて決定されてもよい。
・CSI取得(acquisition)又はビーム管理(management)のためのA-CSI-RSに対し、(そのA-CSI-RSをトリガするPDCCHのCORESETに対して)followUnifiedTCIStateが設定された場合、指示TCI状態が適用される。その他のCSI-RSに対し、そのCSI-RSに対する設定TCI状態("configured TCI state")が適用される。
・全ての個別(dedicated)PUCCHリソースに対し、常に指示TCI状態が適用される。
・動的(dynamic)/設定(configured)グラントPUSCHに対し、常に指示TCI状態が適用される。
・ビーム管理の用途のA-SRSと、コードブック(CB)/ノンコードブック(NCB)/アンテナスイッチングの用途のA/SP/P-SRSのための、SRSリソースセットに対し、統一TCI状態に従うことが設定された場合、指示TCI状態が適用される。その他のSRSに対し、そのSRSリソースセット内の設定TCI状態が適用される。
Rel.17におけるDCIベースビーム指示(DCI-based beam indication)において、ビーム/統一TCI状態の指示の適用時間(ビーム適用時間(BAT)の条件)に関し、以下の検討1及び2が検討されている。
指示されたTCIを適用する最初のスロットは、ジョイント又はセパレートDL/ULビーム指示に対する肯定応答(acknowledgement(ACK))の最後のシンボルの少なくともYシンボル後であることが検討されている。指示されたTCIを適用する最初のスロットは、ジョイント又はセパレートDL/ULビーム指示に対するACK/否定応答(negative acknowledgement(NACK))の最後のシンボルの少なくともYシンボル後であることが検討されている。Yシンボルは、UEによって報告されたUE能力に基づき、基地局によって設定されてもよい。そのUE能力は、シンボルの単位で報告されてもよい。
CAのケースに対し、そのビーム指示の適用タイミング/BATは、以下の選択肢1から3のいずれかに従ってもよい。
[選択肢1]その最初のスロット及びYシンボルの両方は、そのビーム指示を適用する1つ以上のキャリアの内、最小SCSを伴うキャリア上において決定される。
[選択肢2]その最初のスロット及びYシンボルの両方は、そのビーム指示を適用する1つ以上のキャリアと、そのACKを運ぶULキャリアと、の内、最小SCSを伴うキャリア上において決定される。
[選択肢3]その最初のスロット及びYシンボルの両方は、そのACKを運ぶULキャリア上において決定される。
[動作]
UEが、TCI状態指示を伝えるDCIに対応するHARQ-ACK情報を伴うPUCCHの最後のシンボルを送信する場合、Rel.17TCI状態を伴う指示されたTCI状態は、そのPUCCHの最後のシンボルから少なくともYシンボル後である最初のスロットから適用を開始されてもよい。Yは、上位レイヤパラメータ(例えば、BeamAppTime_r17[シンボル])であってもよい。その最初のスロットとYシンボルとの両方は、ビーム指示が適用されるキャリアの内、最小SCSを伴うキャリア上において決定されてもよい。UEは、ある時点において、DL及びUL用のRel17TCI状態を伴う指示された1つのTCI状態を想定してもよいし、UL用のRel17TCI状態を伴う(DLとは別に)指示された1つのTCI状態を想定してもよい。
[UE能力1]
SCSごとの最小適用時間(ACKを運ぶPUCCHの最後のシンボルと、ビームが適用される最初のスロットと、の間のYシンボルの最小値)。
[UE能力2]
ビーム指示PDCCH(DCI)の最後のシンボルと、ビームが適用される最初のスロットと、の間の最小時間ギャップ。ビーム指示PDCCH(DCI)の最後のシンボルと、ビームが適用される最初のスロットと、の間のギャップが、UE能力(最小時間ギャップ)を満たしてもよい。
NRでは、1つ又は複数の送受信ポイント(Transmission/Reception Point(TRP))(マルチTRP)が、1つ又は複数のパネル(マルチパネル)を用いて、UEに対してDL送信を行うことが検討されている。また、UEが、1つ又は複数のTRPに対してUL送信を行うことが検討されている。
ところで、Rel.18以降では、マルチTRPが設定され、かつ、統一TCI状態を適用するケースが導入されることが検討されている。Rel.17まではマルチTRPに対する統一TCI状態の適用がサポートされていない。
上述したマルチTRP及び統一TCI状態の適用(特にシングルDCIベースのマルチTRPにおける統一TCI状態)に関し、以下の検討事項が挙げられる:
・検討1:統一TCI状態のための新規DCIフィールド(単に新規フィールド呼ばれてもよい)の追加。
・検討2:新規DCIフィールドの有無に関わらず、スケジューリングDCI(DCIフォーマット1_1/1_2)の受信と当該DCIに対応するPDSCHの受信と間のオフセット(上述のスケジューリングオフセットと同義)が特定の閾値より小さい場合、UEが、チャネル/信号に適用する指示TCI状態を判断する方法。
・検討3:DCIフォーマット1_0によってスケジュールされたPDSCHを受信する場合における適用方法。
本開示において、「A/B」及び「A及びBの少なくとも一方」は、互いに読み替えられてもよい。また、本開示において、「A/B/C」は、「A、B及びCの少なくとも1つ」を意味してもよい。
<第1の実施形態>
第1の実施形態は、シングルDCIベースのマルチTRPにおける統一TCI状態の適用に関し、下りリンクチャネル(例えばPDSCH)/信号(RS)に対する指示TCI状態のマッピング(適用)について説明する。
実施形態1.1では、PDSCH受信に対する統一TCI状態の適用について説明する。
UEに対し、PDCCH用のSFN設定パラメータ(例えばsfnSchemePdcch)及びPDSCH用のSFN設定パラメータ(例えばsfnSchemePdsch)が設定されている場合で、且つ、スケジューリングオフセット(サービングセルにおけるDCIとPDSCH間のオフセット)が所定閾値(例えば、timeDurationForQCL)以上の場合、DCIフォーマット1_0/1_1/1_2によってスケジュールされるPDSCHに対して、スケジューリングCORESETに対応する2つのTCI状態が適用されてよい。
UEに対し、2つのデフォルトTCI状態を有効化する上位レイヤパラメータ(例えばenableTwoDefaultTCI-States)が設定されている場合で、且つ、スケジューリングオフセットが所定閾値(例えば、timeDurationForQCL)未満であり、さらに少なくとも1つのTCIコードポイントが2つのTCI状態を示している場合、DCIフォーマット1_1/1_2によってスケジュールされるPDSCHに対して、2つのTCI状態が適用されてよい。
指示ジョイント/DL TCI状態が1つの場合、UEは、PDSCH受信のために、当該1つの指示ジョイント/DL TCI状態を適用してもよい。
指示ジョイント/DL TCI状態が2つの場合、UEは、2つの指示ジョイント/DL TCI状態の両方、又は、2つのうち1つの指示ジョイント/DL TCI状態をPDSCH受信のために適用してもよい。
<オプション1>
上述した新規DCIフィールド/TCI状態フィールドに基づく。
<オプション2>
後述する特定の条件/規則に基づく。
<オプション3>
DCIフォーマットに新規DCIフィールドが含まれない場合(例えばDCIフォーマット1_0によってPDSCHがスケジュールされる場合、又はDCIフォーマット1_1/1_2に新規DCIフィールドが設定されない場合)、後述する特定の条件/規則に基づく。
・特定のCORESETによってスケジュール(トリガ)されたかどうか。
特定のCORESETは、USSのみ/CSSのみ/CSS及びUSSの両方を伴うCORESET、CORESET0を含む/含まないCORESET、followUnifiedTCIStateが設定されたCORESET、及び、followUnifiedTCIStateが設定されないCORESETの少なくとも1つであってよい。
・特定のDCIフォーマットによってトリガされたかどうか。
特定のDCIフォーマットは、TCI状態フィールド/新規DCIフィールドを含むDCIフォーマット1_1/1_2、TCI状態フィールド/新規DCIフィールドを含まないDCIフォーマット1_1/1_2、DCIフォーマット1_0の少なくとも1つであってよい。
・CORESETに対してSingle Frequency Network(SFN)が設定されたかどうか。
例えば、あるCORESETに対してSFNが設定された場合、2つの指示ジョイント/DL TCI状態が当該CORESETに適用されてもよい。そうでない場合(例えば、あるCORESETに対してSFNが設定されない場合)、1つの指示ジョイント/DL TCI状態が当該CORESETに適用されてもよい。
・CORESETに対してPDCCHの繰り返し送信(PDCCH repetition)が設定されたかどうか。
例えば、あるCORESETに対してPDCCH repetition(linkedSS)が設定された場合、2つの指示ジョイント/DL TCI状態が当該CORESETに適用されてもよい。そうでない場合(例えば、あるCORESETに対してPDCCH repetition(linkedSS)が設定されない場合)、1つの指示ジョイント/DL TCI状態が当該CORESETに適用されてもよい。
・PDSCHに対してSFNが設定されたかどうか。
例えば、あるPDSCHに対してSFNが設定された場合、2つの指示ジョイント/DL TCI状態が当該PDSCHに適用されてもよい。そうでない場合(例えば、あるPDSCHに対してSFNが設定されない場合)、1つの指示ジョイント/DL TCI状態が当該PDSCHに適用されてもよい。
・PDSCHに対してシングルDCIベースのマルチTRP(例えばノンコヒーレントジョイント送信/再送信(TDM/FDM/SDM repetition))が設定されたかどうか。
例えば、あるPDSCHに対してシングルDCIベースのマルチTRPが設定された場合、2つの指示ジョイント/DL TCI状態が当該PDSCHに適用されてもよい。そうでない場合(例えば、あるPDSCHに対してシングルDCIベースのマルチTRPが設定されない場合)、1つの指示ジョイント/DL TCI状態が当該PDSCHに適用されてもよい。
・PDSCHに対してマルチDCIベースのマルチTRP(例えばCORESETPoolIndex)が設定されたかどうか。
例えば、あるPDSCHに対してマルチDCIベースのマルチTRPが設定された場合、2つの指示ジョイント/DL TCI状態が当該PDSCHに適用されてもよい。そうでない場合(例えば、あるPDSCHに対してマルチDCIベースのマルチTRPが設定されない場合)、1つの指示ジョイント/DL TCI状態が当該PDSCHに適用されてもよい。
実施形態1.2では、CSI-RS受信に対する統一TCI状態の適用について説明する。上述した実施形態1.1の内容は、「PDSCH」を「CSI-RS」に置き換えて本実施形態に適用可能である。そのため、重複する説明は適宜省略し、相違する部分について主に説明する。
指示ジョイント/DL TCI状態が1つの場合、UEは、CSI-RS受信のために、当該1つの指示ジョイント/DL TCI状態を適用してもよい。
指示ジョイント/DL TCI状態が2つの場合、UEは、2つの指示ジョイント/DL TCI状態の両方、又は、2つのうち1つの指示ジョイント/DL TCI状態をCSI-RS受信のために適用してもよい。
実施形態1.3では、PDCCH受信に対する統一TCI状態の適用について説明する。上述した実施形態1.1/1.2の内容は、「PDSCH/CSI-RS」を「PDCCH」に置き換えて本実施形態に適用可能である。そのため、重複する説明は適宜省略し、相違する部分について主に説明する。
指示ジョイント/DL TCI状態が1つの場合、UEは、PDCCH受信のために、当該1つの指示ジョイント/DL TCI状態を適用してもよい。
指示ジョイント/DL TCI状態が2つの場合、UEは、2つの指示ジョイント/DL TCI状態の両方、又は、2つのうち1つの指示ジョイント/DL TCI状態をPDCCH受信のために適用してもよい。
上述した実施形態において、PDSCH用のSFN設定パラメータ(例えばsfnSchemePdsch)が設定されている場合は、以下の少なくとも1つの場合であってもよい:
・PDCCH用のSFN設定パラメータ(例えばsfnSchemePdcch)及びPDSCH用のSFN設定パラメータ(例えばsfnSchemePdsch)の両方が設定されている場合、
・最新のスロット(最後のスロット)における最小CORESET IDが2つのアクティブなTCI状態を有する場合、
・スケジューリングオフセット(DCIとPDSCH間のオフセット)<所定閾値(例えば、timeDurationForQCL)の場合。
・スケジューリングCORESETのSSがCSS/USS(CORESET0/CORESET0でない)であること、
・特定のDCIフォーマットがDCIフォーマット1_0/1_1/1_2のいずれかであること、
・スケジューリングDCIに新規DCIフィールド/TCI状態フィールドが含まれるかどうか、
・スケジューリングCORESETにfollowUnifiedTCIが設定されており、指示TCI状態に従うかどうか。
なお、followUnifiedTCI={1st,2nd,both}として、各CORESETに対して1つ/2つの指示TCI状態が設定/指示されてもよい。
・スケジューリングCORESETのSSがCSS/USS(CORESET0/CORESET0でない)であること、
・特定のDCIフォーマットがDCIフォーマット1_0/1_1/1_2のいずれかであること、
・スケジューリングDCIに新規DCIフィールド/TCI状態フィールドが含まれるかどうか、
・スケジューリングCORESETにfollowUnifiedTCIが設定されており、指示TCI状態に従うかどうか、
・上位レイヤシグナリングの設定による。
上述した実施形態では、TCI状態フィールド/MAC CEによって指示される指示ジョイント/DL TCI状態が1つであればシングルTRPが適用され、当該指示ジョイント/DL TCI状態が2つであれば、シングルTRP/マルチTRPのいずれかの適用が新規DCIフィールド/所定の規則に基づいて決定されることを想定している。
<提案>シングルDCIベースのマルチTRPのための統一TCIフレームワークの拡張について
・ジョイントTCIモードが設定されたサービングセルでは、DCIフォーマット1_1/1_2(DLアサイメントのあり/なしは問わない)の既存のTCI状態フィールドのTCIコードポイントに、第1/第2のジョイントTCI状態のフルセットまたは任意のサブセットをマッピングされることができる。
・UEが、第1/第2のジョイントTCI状態のフルセットでマッピングされたTCIコードポイントを受信する場合、UEは当該フルセット内の対応するジョイントTCI状態を適用してもよい。
・UEが、第1/第2のジョイントTCI状態のサブセットでマッピングされたTCIコードポイントを受信する場合、UEはサブセット内の対応するジョイントTCI状態を適用し、当該サブセットにはない現在適用中のジョイントTCI状態を保持してもよい。
・セパレートTCIモードが設定されたサービングセルでは、DCIフォーマット1_1/1_2(DLアサイメントのあり/なしは問わない)の既存のTCI状態フィールドのTCIコードポイントに、第1/第2のDL/UL TCI状態のフルセットまたは任意のサブセットをマッピングされることができる。
・UEが、第1/第2のDL/UL TCI状態のフルセットでマッピングされたTCIコードポイントを受信する場合、UEは当該フルセット内の対応するDL/UL TCI状態(セパレートTCI状態)を適用してもよい。
・UEが、第1/第2のDL/UL TCI状態のサブセットでマッピングされたTCIコードポイントを受信する場合、UEはサブセット内の対応するDL/UL TCI状態(セパレートTCI状態)を適用し、当該サブセットにはない現在適用中のDL/UL TCI状態(セパレートTCI状態)を保持してもよい。
第2の実施形態は、シングルDCIベースのマルチTRPにおける統一TCI状態の適用に関し、上りリンクチャネル(例えばPUSCH)/信号(RS)に対する指示TCI状態のマッピング(適用)について説明する。
実施形態2.1では、PUSCH送信に対する統一TCI状態の適用について説明する。上述した実施形態1.1の内容は、「PDSCH」を「PUSCH」に、「PDSCH受信」を「PUSCH送信」に置き換えて本実施形態に適用可能である。
<方法1>
・既存のSRSリソースセットインジケータを用いて指示する。
この方法によれば、既存仕様を流用することでUE実装の複雑さを回避することが可能である。
<方法2>
・PDSCHと同様に、新規DCIフィールドを用いて通知する。例えば{1st,2nd,both (1st+2nd),both (2nd+1st)}のいずれかを指示することが可能である。
この方法によれば、PDSCHと同じ方法を採用することで運用を単純化することが可能である。
<方法3>
・既存のSRSリソースセットインジケータを用いる場合において、SRS resources with usage=CB/NCBが設定される(SRSリソースの用途がコードブック/ノンコードブックに設定される)SRSは必ず指示ジョイント/UL TCI状態に従う。
この方法によれば、上記2つの方法1-2が実質的に同じ方法になり、運用を単純化することが可能である。
指示ジョイント/UL TCI状態が1つの場合、UEは、PUSCH受信のために、当該1つの指示ジョイント/UL TCI状態を適用してもよい。
指示ジョイント/UL TCI状態が2つの場合、UEは、2つの指示ジョイント/UL TCI状態の両方、又は、2つのうち1つの指示ジョイント/UL TCI状態をPDSCH受信のために適用してもよい。
実施形態2.2では、SRS送信に対する統一TCI状態の適用について説明する。上述した実施形態1.2の内容は、「CSI-RS」を「SRS」に置き換えて本実施形態に適用可能である。また、実施形態2.1の内容は、「PUSCH」を「SRS」に置き換えて本実施形態に適用可能である。そのため、重複する説明は適宜省略し、相違する部分について主に説明する。
<方法1>
・SRSリソース(セット)ごとに上位レイヤシグナリングを用いてfollowUnifiedTCISRS_R18={1st, 2nd}を通知する。この場合、UEは、通知されたインデックスに対応する指示ジョイント/UL TCI状態を各SRSリソース(セット)に適用してもよい。なお、指示ジョイント/UL TCI状態が1つの場合、上位レイヤシグナリングによって設定された値に関わらず、UEは、followUnifiedTCISRS_R18が設定されたSRSリソース(セット)に対して1つの指示ジョイント/UL TCI状態を適用してもよい。
<方法2>
UEは、所定のルールに基づいてSRSリソース(セット)に対して指示ジョイント/UL TCI状態を適用してもよい。例えばUEは、SRS resources with usage=CB/NCBが設定される場合、第1のSRSリソースセット(SRSリソースセットIDの小さいSRSリソースセット)に対して第1の指示ジョイント/UL TCI状態を適用し、第2のSRSリソースセット(SRSリソースセットIDの大きいSRSリソースセット)に対して第2の指示ジョイント/UL TCI状態を適用してもよい。なお、指示ジョイント/UL TCI状態が1つの場合、UEは、第1/第2のSRSリソースセットの両方に対して、当該1つの指示ジョイント/UL TCI状態を適用してもよい。
指示ジョイント/UL TCI状態が1つの場合、UEは、SRS送信のために、当該1つの指示ジョイント/UL TCI状態を適用してもよい。
指示ジョイント/UL TCI状態が2つの場合、UEは、2つの指示ジョイント/UL TCI状態の両方、又は、2つのうち1つの指示ジョイント/UL TCI状態をSRS受信のために適用してもよい。
実施形態2.3では、PUCCH送信に対する統一TCI状態の適用について説明する。上述した実施形態1.3の内容は、「PDCCH」を「PUCCH」に置き換えて本実施形態に適用可能である。そのため、重複する説明は適宜省略し、相違する部分について主に説明する。
指示ジョイント/UL TCI状態が1つの場合、UEは、PUCCH送信のために、当該1つの指示ジョイント/UL TCI状態を適用してもよい。
指示ジョイント/UL TCI状態が2つの場合、UEは、2つの指示ジョイント/UL TCI状態の両方、又は、2つのうち1つの指示ジョイント/UL TCI状態をPUCCH送信のために適用してもよい。
上述した実施形態において、上位レイヤシグナリングによって{1st,2nd,both}のいずれかが設定されている場合、UEは、以下の少なくとも1つに基づいて指示ジョイント/UL TCI状態の適用を判断してもよい:
・2つの指示ジョイント/UL TCI状態が指示された場合、上述の設定に基づいて適用する指示ジョイント/UL TCI状態を判断する。
・1つの指示ジョイント/UL TCI状態が指示された場合、上述の設定に関わらず、適用する指示ジョイント/UL TCI状態を判断してもよく、上述の設定に基づいて適用する指示ジョイント/UL TCI状態を判断してもよい。
・指示TCI状態がサービングセルのPCIに対応する、
・複数の指示TCI状態の少なくとも一部がサービングセルのPCIに対応する、
・指示TCI状態が追加PCI(サービングセルのPCI以外のPCI)に対応する、
・複数の指示TCI状態の少なくとも一部が追加PCI(サービングセルのPCI以外のPCI)に対応する。
[UEへの情報の通知]
上述の実施形態における(ネットワーク(Network(NW))(例えば、基地局(Base Station(BS)))から)UEへの任意の情報の通知(言い換えると、UEにおけるBSからの任意の情報の受信)は、物理レイヤシグナリング(例えば、DCI)、上位レイヤシグナリング(例えば、RRCシグナリング、MAC CE)、特定の信号/チャネル(例えば、PDCCH、PDSCH、参照信号)、又はこれらの組み合わせを用いて行われてもよい。
上述の実施形態におけるUEから(NWへ)の任意の情報の通知(言い換えると、UEにおけるBSへの任意の情報の送信/報告)は、物理レイヤシグナリング(例えば、UCI)、上位レイヤシグナリング(例えば、RRCシグナリング、MAC CE)、特定の信号/チャネル(例えば、PUCCH、PUSCH、PRACH、参照信号)、又はこれらの組み合わせを用いて行われてもよい。
上述の実施形態の少なくとも1つは、特定の条件を満たす場合に適用されてもよい。当該特定の条件は、規格において規定されてもよいし、上位レイヤシグナリング/物理レイヤシグナリングを用いてUE/BSに通知されてもよい。
・上記実施形態の少なくとも1つについての特定の処理/動作/制御/情報(例えば、統一TCI状態を利用する場合の、シングルTRP及びマルチTRP間の切り替え)をサポートすること、
・シングルTRP/マルチTRPの切り替えをスケジューリングDCIで通知することをサポートすること。
本開示の一実施形態(第1の実施形態)に関して、以下の発明を付記する。
[付記1]
下りリンク制御情報(DCI)によりスケジュール又はトリガされる下りリンク(DL)チャネル及びDL参照信号の少なくとも1つを受信する受信部と、
前記DCIに含まれる特定のフィールドによって指示される統一Transmission Configuration Indication(TCI状態)に基づいて、前記DLチャネル又は前記DL参照信号の受信に適用する指示TCI状態を判断する制御部と、を有する端末。
[付記2]
前記DLチャネルは、物理下りリンク共有チャネル(PDSCH)及び物理下りリンク制御チャネル(PDCCH)のいずれかであり、
前記DL参照信号は、チャネル状態情報参照信号(CSI-RS)である、付記1に記載の端末。
[付記3]
前記制御部は、特定の条件に基づいて、前記DLチャネル又は前記DL参照信号の受信に適用する指示TCI状態の数を判断する付記1又は付記2に記載の端末。
[付記4]
前記特定の条件は、
前記DLチャネル又は前記DL参照信号が特定の制御リソースセット(CORESET)によってスケジュール又はトリガされること、
前記CORESETに対してSingle Frequency Network(SFN)が設定されること、
シングルDCIベースのマルチ送受信ポイント(TRP)が設定されること、の少なくとも1つである、付記1から付記3のいずれかに記載の端末。
本開示の一実施形態(第2の実施形態)に関して、以下の発明を付記する。
[付記1]
下りリンク制御情報(DCI)によりスケジュール又はトリガされる上りリンク(UL)チャネル及びUL参照信号の少なくとも1つを送信する送信部と、
前記DCIに含まれる特定のフィールドによって指示される統一Transmission Configuration Indication(TCI状態)に基づいて、前記ULチャネル又は前記UL参照信号の送信に適用する指示TCI状態を判断する制御部と、を有する端末。
[付記2]
前記ULチャネルは、物理上りリンク共有チャネル(PUSCH)及び物理上りリンク制御チャネル(PUCCH)のいずれかであり、
前記UL参照信号は、測定用参照信号(SRS)である、付記1に記載の端末。
[付記3]
前記制御部は、特定の条件に基づいて、前記ULチャネル又は前記UL参照信号の受信に適用する指示TCI状態の数を判断する付記1又は付記2に記載の端末。
[付記4]
前記特定の条件は、
前記ULチャネル又は前記UL参照信号が特定の制御リソースセット(CORESET)に関連付けられること、
前記CORESETに対してSingle Frequency Network(SFN)が設定されること、
シングルDCIベースのマルチ送受信ポイント(TRP)が設定されること、の少なくとも1つである、付記1から付記3のいずれかに記載の端末。
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11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12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)
- 下りリンク制御情報(DCI)によりスケジュール又はトリガされる下りリンク(DL)チャネル及びDL参照信号の少なくとも1つを受信する受信部と、
前記DCIに含まれる特定のフィールドによって指示される統一Transmission Configuration Indication(TCI状態)に基づいて、前記DLチャネル又は前記DL参照信号の受信に適用する指示TCI状態を判断する制御部と、を有する端末。 - 前記DLチャネルは、物理下りリンク共有チャネル(PDSCH)及び物理下りリンク制御チャネル(PDCCH)のいずれかであり、
前記DL参照信号は、チャネル状態情報参照信号(CSI-RS)である、請求項1に記載の端末。 - 前記制御部は、特定の条件に基づいて、前記DLチャネル又は前記DL参照信号の受信に適用する指示TCI状態の数を判断する請求項1に記載の端末。
- 前記特定の条件は、
前記DLチャネル又は前記DL参照信号が特定の制御リソースセット(CORESET)によってスケジュール又はトリガされること、
前記CORESETに対してSingle Frequency Network(SFN)が設定されること、
シングルDCIベースのマルチ送受信ポイント(TRP)が設定されること、の少なくとも1つである、請求項3に記載の端末。 - 下りリンク制御情報(DCI)によりスケジュール又はトリガされる下りリンク(DL)チャネル及びDL参照信号の少なくとも1つを受信するステップと、
前記DCIに含まれる特定のフィールドによって指示される統一Transmission Configuration Indication(TCI状態)に基づいて、前記DLチャネル又は前記DL参照信号の受信に適用する指示TCI状態を判断するステップと、を有する端末の無線通信方法。 - 下りリンク制御情報(DCI)によりスケジュール又はトリガされる下りリンク(DL)チャネル及びDL参照信号の少なくとも1つを送信する送信部と、
端末が前記DLチャネル又は前記DL参照信号の受信に適用する指示Transmission Configuration Indication(TCI状態)を判断するために統一TCI状態を指示する特定のフィールドを前記DCIに含めて送信するように制御する制御部と、を有する基地局。
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| EP23922710.1A EP4668596A1 (en) | 2023-02-16 | 2023-02-16 | Terminal, wireless communication method, and base station |
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Non-Patent Citations (5)
| Title |
|---|
| "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8", 3GPP TS 36.300 V8.12.0, April 2010 (2010-04-01) |
| BO GAO, ZTE: "Enhancements on unified TCI framework extension for multi-TRP", 3GPP DRAFT; R1-2210935; TYPE DISCUSSION; NR_MIMO_EVO_DL_UL-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 1, no. Toulouse, FR; 20221114 - 20221118, 7 November 2022 (2022-11-07), FR, XP052221499 * |
| CATT: "On unified TCI framework extension for multi-TRP operation", 3GPP DRAFT; R1-2208945, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20221010 - 20221019, 30 September 2022 (2022-09-30), FR, XP052276865 * |
| See also references of EP4668596A1 |
| SHINYA KUMAGAI, NTT DOCOMO, INC.: "Discussion on unified TCI framework extension for multi-TRP", 3GPP DRAFT; R1-2211969; TYPE DISCUSSION; NR_MIMO_EVO_DL_UL-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 1, no. Toulouse, FR; 20221114 - 20221118, 7 November 2022 (2022-11-07), FR, XP052222533 * |
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