WO2024095477A1 - 端末、無線通信方法及び基地局 - Google Patents
端末、無線通信方法及び基地局 Download PDFInfo
- Publication number
- WO2024095477A1 WO2024095477A1 PCT/JP2022/041236 JP2022041236W WO2024095477A1 WO 2024095477 A1 WO2024095477 A1 WO 2024095477A1 JP 2022041236 W JP2022041236 W JP 2022041236W WO 2024095477 A1 WO2024095477 A1 WO 2024095477A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tci
- tci state
- dci
- unified
- indicated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Images
Classifications
-
- 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
-
- 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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
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 has a receiver that receives downlink control information (DCI) indicating a unified Transmission Configuration Indication (TCI state) and at least one of a downlink (DL) channel and a DL reference signal scheduled or triggered by the DCI, and a controller that applies the unified TCI state to at least one of the DL channel and the DL reference signal when only one unified TCI state is indicated in a cell or a bandwidth part (BWP), and applies one of the multiple unified TCI states or the multiple unified TCI states to at least one of the DL channel and the DL reference signal when indication of multiple unified TCI states is supported in the cell or the BWP.
- DCI downlink control information
- TCI state Transmission Configuration Indication
- DL downlink
- BWP bandwidth part
- the TCI state can be appropriately applied.
- 1A and 1B show an example of a unified/common TCI framework.
- 2A and 2B show an example of a 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. 8A and 8B are diagrams illustrating another example of application of an indicated TCI state according to the first embodiment.
- 9A and 9B are diagrams illustrating another example of application of an indicated TCI state according to the first embodiment.
- FIG. 10 is a diagram illustrating an example of application of an indicated TCI state according to the second embodiment.
- FIG. 11 is a diagram illustrating another example of application of the indicated TCI state according to the second embodiment.
- FIG. 12 is a diagram showing another example of application of the indicated TCI state according to the second embodiment.
- FIG. 13 is a diagram showing another example of application of the indicated TCI state according to the second embodiment.
- FIG. 14 is a diagram showing an example of a QCL assumption of a PDCCH according to the third embodiment.
- FIG. 15 is a diagram showing another example of QCL assumption of the PDCCH according to the third embodiment.
- FIG. 16 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 17 is a diagram illustrating an example of the configuration of a base station according to an embodiment.
- FIG. 18 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment.
- FIG. 19 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment.
- FIG. 20 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 the 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 in the PDSCH/PDCC (updated using Rel. 17 DCI/MAC CE/RRC), the PUSCH of the dynamic grant (DCI)/configured grant, and multiple (e.g., all) dedicated PUCCH resources.
- the configured Rel. 17 TCI state may be configured by the 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 set/instructed for each CORESET/resource/resource set using RRC/MAC CE. It is also being considered that the UE will make decisions regarding the setting/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) In the DCI-based beam indication in Rel. 17, the following considerations 1 and 2 are considered regarding the application time of the indication of the beam/unified TCI state (beam application time (BAT) condition).
- 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.
- the ACK may be an ACK for a PDSCH scheduled by the beam instruction DCI.
- the PDSCH may not be transmitted.
- the ACK may be an ACK for the beam instruction 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, we assume that each TRP is capable of transmitting four different beams, but this is not limited to this example.
- 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.
- the inventors therefore 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. Also, in this disclosure, “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 two CORESET pool indices
- 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 first embodiment describes an example of application of a unified TCI state in a single DCI based multi-TRP.
- the UE may apply the one indicated joint/DL TCI state for PDSCH reception in the CC/BWP.
- a DCI field included in the DCI may be used to indicate that the UE applies the first joint/DL TCI state, the second joint/DL TCI state, or both to PDSCH reception in the CC/BWP.
- the presence of the DCI field may be configurable by the RRC.
- the UE may apply both indicated joint/DL TCI states to PDSCH reception in the CC/BWP.
- a case where there are two indication joint/DL TCI states may be a case where the two indication joint/DL TCI states are in an applicable state.
- this may be a case where two indication joint/DL TCI states are supported/configured/applicable in the CC/BWP, or a case where it is configured by an RRC parameter that the two indication joint/DL TCI states are supported/configured/applicable, or a case where two indication joint/DL TCI states are activated (e.g., two TCI states are mapped to one code point in a specified field of the DCI).
- the indication J/DL TCI state may always be applied. This may be applied regardless of whether an RRC parameter (e.g., followUnifiedTCI) indicating following the unified TCI state is set. Alternatively, the indication J/DL TCI state may be applied regardless of whether the scheduling offset (offset between DCI and PDSCH) is less than a predetermined threshold (e.g., timeDurationForQCL). Alternatively, the indication J/DL TCI state may be applied regardless of the CORESET (e.g., scheduling CORESET) used for scheduling. Alternatively, the indication J/DL TCI state may be applied regardless of whether the scheduling DCI format/TCI state field is present.
- RRC parameter e.g., followUnifiedTCI
- the indication J/DL TCI state may be applied regardless of whether the scheduling offset (offset between DCI and PDSCH) is less than a predetermined threshold (e.g., timeDurationForQCL).
- the indication J/DL TCI state may be applied regardless of the CORESET (e.
- the conditions under which operation #1 is applied may be limited/restricted.
- the operation in which the UE applies only one indicated joint/DL TCI state for PDSCH reception in a CC/BWP may be applied only in a specific case.
- the specific case may be, for example, when the indicated joint/DL TCI state is associated with the PCI of the serving cell (operation #A).
- the indicated joint/DL TCI state is associated with the PCI of a non-serving cell and the scheduling offset ⁇ a predetermined threshold (e.g., timeDurationForQCL), the default QCL rule of the existing system (e.g., Rel. 15) may be applied.
- a predetermined threshold e.g., timeDurationForQCL
- the default QCL rule of the existing system e.g., Rel. 15
- the operation of the UE applying only one indicating joint/DL TCI state for PDSCH reception in a CC/BWP may be applied if the indicating joint/DL TCI state is related to the PCI of the serving cell or the PCI of an additional cell (operation #B).
- operation #B may be applied when there is one indicated joint/DL TCI state within one BWP/CC.
- the UE may not assume that the indicated joint/DL TCI state relates to a PCI other than the PCI of the serving cell. In other words, the configuration may not simultaneously apply/support Rel. 17 L1/L2 inter-cell mobility and Rel. 18 single DCI-based multi-TRP.
- a certain RRC parameter e.g., more than one joint/DL TCI states for sDCI mTRP
- the indicated joint/DL TCI state may relate to a PCI other than the PCI of the serving cell.
- the UE may buffer the received signal in all indication joint/DL TCI states (see Figures 7A-7C).
- FIGs 7A-7C are diagrams showing an example of application of indicated TCI states. As shown in the example of Figure 7A, two indicated TCI states (TCI#1 as the first TCI state and TCI#2 as the second TCI state) are indicated to the UE by the RRC/MAC CE/DCI. Note that the number of indicated TCI states is not limited to 2 and may be another value (e.g., 4).
- one or two TCI states is indicated by a specific field (existing field (e.g., 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., 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 7C 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 is to be applied, as shown in Figure 7B.
- 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
- Figure 7C shows the case where PDSCH is scheduled by DCI and the scheduling offset ⁇ a predefined threshold (e.g., timeDurationForQCL).
- a predefined threshold e.g., timeDurationForQCL
- TCI state #1 and TCI state #2 two indicated joint/DL TCI states
- TCI state #2 two indicated joint/DL TCI states
- TCI state #1 the first (1st) TCI state
- TCI state #1 is indicated by the TCI state field of DCI.
- 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.
- This may mean switching between Rel. 17 unified TCI state for single TRP and Rel. 18 unified TCI state for single DCI based multi-TRP using the number of "indicated joint/DL TCI states in CC/BWP" indicated in RRC/MAC CE/DCI.
- the Rel. 17 unified TCI state for single TRP may support L1/L2 inter-cell mobility, but the Rel. 18 unified TCI state may not support L1/L2 inter-cell mobility.
- RRC parameters may be used to switch between the Rel. 17 unified TCI state for single TRP and the Rel. 18 unified TCI state for single DCI-based multi-TRP (or the Rel. 18 single DCI-based multi-TRP operation). For example, when a certain RRC parameter is set, the Rel. 18 single DCI-based multi-TRP may be applied, and the Rel. 17 operation may be applied otherwise.
- the indication of one joint/DL TCI state in the CC/BWP may be indicated by the RRC/MAC CE or the TCI state field of the DCI.
- the DCI (e.g., DCI format 1_1/1_2) may be a DCI with or without a DL assignment.
- an indication of one joint/DL TCI state in the CC/BWP may be indicated by an existing/new field of the scheduling DCI (e.g., DCI format 1_0/1_1/1_2).
- the new field of the DCI may be multiple fields (e.g., a first index field, a second index field) that are used to indicate the TCI state for the PDSCH and the PUCCH, respectively.
- the operation of whether or not the UE buffers the received signal based on multiple TCIs may be changed depending on whether or not the operation is switched/specified by a field in the scheduling DCI.
- the existence of a DCI field (or the presence or absence of a DCI field) used to indicate the TCI state can be set by RRC, and if there is no DCI field in DCI format 1_1/1_2 (e.g., a field indicating 1st, 2nd, or both of the two joint/DL TCI states), the joint/DL TCI state indicated for PDSCH reception in CC/BWP may be applied, or the TCI state of the PDSCH/A-CSI-RS may be determined based on a specified rule. For example, if two joint/DL TCI states are indicated, both, or one of 1st and 2nd, may be selected.
- the specified rule may be defined in the specifications, or may be set by an RRC parameter.
- the joint/DL TCI state indicated for PDSCH reception in the CC/BWP may be applied if the offset between reception of DCI format 1_1/1_2 and reception of the corresponding PDSCH is less than a threshold (e.g., timeDurationForQCL), regardless of the presence or absence of a DCI field.
- a threshold e.g., timeDurationForQCL
- the UE may ignore the DCI field.
- the DCI field may be applied to other purposes. The other purposes may be, for example, indicating a joint/DL TCI state or indicating a UL TCI state. In this case, the DCI field may also be used to indicate the indicated joint/DL/UL TCI state in addition to the existing TCI state field.
- a buffering operation #1 may be performed on the received signal assuming a plurality of (e.g., two) joint DL/TCI states, and a buffering operation #2 may be performed on the received signal assuming one joint DL/TCI state.
- the buffering operation may be read as a receiving operation.
- the UE When applying buffering operation #1, the UE may perform buffering processing of the received signal assuming two joint/DL TCI states, and when applying buffering operation #2, the UE may perform buffering processing of the received signal assuming one joint/DL TCI state (see Figures 8A and B).
- the method of selecting one joint/DL TCI state to be used may be determined based on a predetermined rule.
- information on a predetermined TCI state to be used in buffering may be set/notified by an RRC parameter. For example, the number of the TCI state among two joint/DL TCI states may be notified, or the TCI state ID may be notified.
- Which of buffering operation #1 (e.g., FIG. 8A) and buffering operation #2 (e.g., FIG. 8B) to apply may be determined/selected based on at least one of the following switching rules #1-1 to #1-4.
- Either buffering operation #1 or buffering operation #2 may be configured/activated/indicated by higher layer signaling/MAC CE/DCI.
- ⁇ Switching Rules #1-2> Based on the configured/supported indication joint/DL TCI states (eg, the number of indication joint/DL TCI states), it may be determined whether buffering operation #1 or buffering operation #2 is applied.
- ⁇ Switching Rules #1-3> Depending on the UE capability (e.g., UE capability), it may be possible to signal whether buffering operation #1 or buffering operation #2 is applied.
- ⁇ Switching Rules #1-4> It may be determined whether the buffering operation #1 or the buffering operation #2 is applied based on the frequency domain/time domain of reception. For example, it may be determined whether the buffering operation #1 or the buffering operation #2 is applied based on whether the reception is in a predetermined CC/BWP/slot/symbol or in another CC/BWP/slot/symbol.
- the UE does not need to always buffer the received signal assuming two joint/DL TCI states. This makes it possible to avoid memory pressure and increased power consumption in the UE.
- A-CSI-RS In addition, although the above description has been given using PDSCH as an example, applicable channels/signals are not limited to PDSCH. For example, it may be applied to aperiodic CSI-RS (e.g., A-CSI-RS). In this case, PDSCH may be replaced with A-CSI-RS and the first embodiment may be applied. In this case, it may be a beam switch timing (e.g., beamSwitchTiming) instead of a predetermined threshold (e.g., timeDurationForQCL).
- a beam switch timing e.g., beamSwitchTiming
- a predetermined threshold e.g., timeDurationForQCL
- switching between buffering operation #1 (or receiving operation #1) and buffering operation #2 (or receiving operation #2) may be applied/supported (see Figures 9A and B).
- TCI state may be applied to the A-CSI-RS. In this case, even if two TCI states are indicated, only one TCI state may be used to receive the A-CSI-RS.
- the UE may receive the A-CSI-RS using the designated joint/DL TCI state. This operation may be applied when there is no other DL signal in the same symbol. If there is another DL signal in the same symbol, the other DL signal may apply one TCI state if it corresponds to one TCI state, and one of the two TCI states (e.g., the first TCI state (1st TCI state)) may be applied if it corresponds to two TCI states.
- the two TCI states e.g., the first TCI state (1st TCI state)
- the UE may use either one (e.g., the 1st indication joint/DL TCI state) to receive the A-CSI-RS.
- Which indication joint value/DL TCI state is applied/selected may be configured by an RRC parameter.
- a predetermined threshold e.g., timeDurationForQCL
- Action #1A The indicated J/DL TCI state may be applied, for example, regardless of the serving cell PCI.
- the indicated joint/DL TCI state corresponds to the serving cell PCI, the indicated joint/DL TCI state is applied, otherwise the Rel. 16 default QCL for single DCI based multi-TRP may be applied.
- the Rel. 16 default QCL for single DCI based multi-TRP may be the TCI/QCL of the lowest TCI codepoint (e.g., the lowest TCI codepoint) among the TCI codepoints (e.g., the codepoints in the TCI state field) that have two active TCI states for the TCI/QCL of the PDSCH.
- Action #1/Action #2 may be applied regardless of whether an RRC parameter indicating to follow the unified TCI state (e.g., followUnifiedTCI) is set or not. Alternatively, Action #1/Action #2 may be applied regardless of the CORESET used for scheduling (e.g., scheduling CORESET). Alternatively, Action #1/Action #2 may be applied regardless of whether the scheduling DCI format/TCI state field is present or not.
- an RRC parameter indicating to follow the unified TCI state e.g., followUnifiedTCI
- Action #1/Action #2 may be applied regardless of the CORESET used for scheduling (e.g., scheduling CORESET).
- Action #1/Action #2 may be applied regardless of whether the scheduling DCI format/TCI state field is present or not.
- the second embodiment describes an example of application of a unified TCI state in a multi-DCI based multi-TRP.
- one joint/DL TCI state may be indicated per CORESET pool index.
- the UE may apply at least one of the following options 2-1 to 2-4.
- Two designated joint/DL TCI states each corresponding to a CORESET pool index (eg, #0 and #1), may be used to buffer (or process) received signals.
- the UE may buffer the PDSCH using both the indication joint/DL TCI state corresponding to the first CORESET pool index #0 and the indication joint/DL TCI state corresponding to the second CORESET pool index #1.
- the UE may complete DCI decoding (e.g., DCI coding) and then perform PDSCH reception processing in the indicated joint/DL TCI state associated with the CORESET pool index corresponding to the DCI (or PDCCH).
- DCI decoding e.g., DCI coding
- PDSCH reception processing in the indicated joint/DL TCI state associated with the CORESET pool index corresponding to the DCI (or PDCCH).
- the UE may apply the indication joint/DL TCI state corresponding to the first CORESET pool index #0 to the PDSCH #0 scheduled by the first DCI #0 corresponding to the first CORESET pool index #0.
- the UE may use both the indication joint/DL TCI state corresponding to the first CORESET pool index #0 and the indication joint/DL TCI state corresponding to the second CORESET pool index #1 for the PDSCH #0 (see FIG. 10).
- the UE may apply the indication joint/DL TCI state corresponding to the second CORESET pool index #1 to the PDSCH #1 scheduled by the first DCI #1 corresponding to the second CORESET pool index #1.
- the UE may use both the indication joint/DL TCI state corresponding to the first CORESET pool index #0 and the indication joint/DL TCI state corresponding to the second CORESET pool index #1 for the PDSCH #1 (see FIG. 10).
- Buffering (or reception processing) of a received signal may be performed using an indication joint/DL TCI state corresponding to any one (or one) of multiple (e.g., two) CORESET pool indexes (e.g., #0 and #1).
- the UE may apply the indication joint/DL TCI state corresponding to the first CORESET pool index #0 to the PDSCH #0 scheduled with the first DCI #0 corresponding to the first CORESET pool index #0.
- the UE may use one indication joint/DL TCI state corresponding to the first CORESET pool index #0 or #1 for the PDSCH #0 (see FIG. 11).
- the selection of the joint/DL TCI state to be used for buffering may be determined based on a predetermined rule. For example, the UE may select/determine one joint/DL TCI state based on a specific code point of a specific field.
- the specific field may be a field used for switching between single TRP and multi-TRP, may be an existing field (e.g., a TCI field), or may be a new field defined in Rel. 18 or later.
- the specific code point may be, for example, the lowest (or highest) TCI code point.
- the selection of the joint/DL TCI state to be used for buffering may be set by an RRC parameter.
- information regarding a specific TCI state to be applied to buffering may be set by an RRC parameter.
- the order of the indicated joint/DL TCI state among two indicated joint/DL TCI states may be set, or a TCI state ID may be set.
- the UE may perform buffering/reception processing for each PDSCH using one indication joint/DL TCI state corresponding to the CORESET pool index of the CORESET in which the DCI that schedules each PDSCH is transmitted.
- option 2-3 The operation of option 2-1 (e.g., buffering operation #1) and the operation of option 2-2 (buffering operation #2) may be applied by switching.
- the UE may control the switching based on at least one of the following switching rules #2-1 to #2-4.
- ⁇ Switching Rule #2-1> Either the operation of option 2-1 (eg, buffering operation #1) or the operation of option 2-2 (buffering operation #2) may be configured/activated/indicated by higher layer signaling/MAC CE/DCI.
- ⁇ Switching Rule #2-2> Based on the configured/supported indication joint/DL TCI state (e.g., the number of indication joint/DL TCI states), it may be determined whether the operation of Option 2-1 (e.g., Buffering Operation #1) or the operation of Option 2-2 (Buffering Operation #2) is applied.
- the operation of Option 2-1 e.g., Buffering Operation #1
- the operation of Option 2-2 Buffering Operation #2
- the operation of option 2-1 e.g., buffering operation #1
- the operation of option 2-2 buffering operation #2
- ⁇ Switching Rule #2-4> Based on the frequency domain/time domain to be received, it may be determined whether the operation of option 2-1 (e.g., buffering operation #1) or the operation of option 2-2 (buffering operation #2) is applied. For example, based on whether reception is in a predetermined CC/BWP/slot/symbol or in another CC/BWP/slot/symbol, it may be determined whether the operation of option 2-1 (e.g., buffering operation #1) or the operation of option 2-2 (buffering operation #2) is applied.
- the operation of option 2-1 e.g., buffering operation #1
- option 2-2 buffering operation #2
- the first PDSCH #0 is scheduled by the first DCI #0 corresponding to the first CORESET pool index #0
- the second PDSCH #1 is scheduled by the second DCI #1 corresponding to the second CORESET pool index #1 (see FIG. 12).
- the case is shown where the second DCI #1 is transmitted after the first DCI #0, and the second DCI #1 is transmitted before the first PDSCH #0.
- the UE may receive the second DCI #1 during a first period (e.g., from after the transmission of the first DCI #0 to the transmission of the second DCI #1) and buffer the received signal in a QCL (e.g., an indicated joint/DL TCI state corresponding to the first CORESET pool index #0) different from that of the second DCI #1.
- a QCL e.g., an indicated joint/DL TCI state corresponding to the first CORESET pool index #0
- the UE may buffer the received signal using two joint/DL TCI states.
- the UE does not need to always buffer the received signal assuming two joint/DL TCI states. This makes it possible to avoid memory pressure and increased power consumption in the UE.
- Option 2-1/2-2/2-3 may be applied regardless of whether an RRC parameter indicating following the unified TCI state (e.g., followUnifiedTCI) is set.
- option 2-1/2-2/2-3 may be applied regardless of whether the scheduling offset (offset between DCI and PDSCH) is less than a predefined threshold (e.g., timeDurationForQCL).
- option 2-1/2-2/2-3 may be applied regardless of the CORESET used for scheduling (e.g., scheduling CORESET).
- option 2-1/2-2/2-3 may be applied regardless of whether the scheduling DCI format/TCI state field is present.
- A-CSI-RS In addition, although the above description has been given using PDSCH as an example, applicable channels/signals are not limited to PDSCH. For example, it may be applied to aperiodic CSI-RS (e.g., A-CSI-RS). In this case, the second embodiment may be applied by replacing PDSCH with A-CSI-RS (see FIG. 13). In this case, beam switch timing (e.g., beamSwitchTiming) may be used instead of a predetermined threshold (e.g., timeDurationForQCL). FIG. 13 shows an example of the case where option 2-1 is applied to A-CSI-RS. Of course, option 2-2/2-3 may be applied to A-CSI-RS.
- beam switch timing e.g., beamSwitchTiming
- a predetermined threshold e.g., timeDurationForQCL
- one joint/DL TCI state corresponding to at least one CORESET pool index may correspond to the serving cell PCI.
- Rel. 17 multi-TRP inter cell e.g., Rel. 17 M-TRP inter cell
- the TRP/TCI state corresponding to one CORESET pool index serving cell PCI is used, and that the TCI state is used to receive system information/short messages.
- Option 2-4 may be applied regardless of whether an RRC parameter indicating following the unified TCI state (e.g., followUnifiedTCI) is set. Alternatively, option 2-4 may be applied regardless of whether the scheduling offset (offset between DCI and PDSCH) is less than a predefined threshold (e.g., timeDurationForQCL). Alternatively, option 2-4 may be applied regardless of the CORESET used for scheduling (e.g., scheduling CORESET). Alternatively, option 2-4 may be applied regardless of whether the scheduling DCI format/TCI state field is present.
- a predefined threshold e.g., timeDurationForQCL
- option 2-4 may be applied regardless of the CORESET used for scheduling (e.g., scheduling CORESET).
- option 2-4 may be applied regardless of whether the scheduling DCI format/TCI state field is present.
- a predetermined threshold e.g., timeDurationForQCL
- Action #1B The indicated J/DL TCI state may be applied, for example, regardless of the serving cell PCI.
- the indicated joint/DL TCI state corresponds to the serving cell PCI, the indicated joint/DL TCI state is applied, otherwise the Rel. 16 default QCL for multi-DCI based multi-TRP may be applied.
- the Rel. 16 default QCL for multi-DCI based multi-TRP may be the TCI/QCL corresponding to the smallest CORESET ID in the latest monitoring slot for each CORESET pool index.
- Action #1/Action #2 may be applied regardless of whether an RRC parameter indicating to follow the unified TCI state (e.g., followUnifiedTCI) is set or not. Alternatively, Action #1/Action #2 may be applied regardless of the CORESET used for scheduling (e.g., scheduling CORESET). Alternatively, Action #1/Action #2 may be applied regardless of whether the scheduling DCI format/TCI state field is present or not.
- an RRC parameter indicating to follow the unified TCI state e.g., followUnifiedTCI
- Action #1/Action #2 may be applied regardless of the CORESET used for scheduling (e.g., scheduling CORESET).
- Action #1/Action #2 may be applied regardless of whether the scheduling DCI format/TCI state field is present or not.
- the third embodiment describes an example of PDCCH reception (or PDCCH repetition) having different QCLs (eg, QCL-D).
- the UE when receiving PDSCH/A-CSI-RS from corresponding DCI below a predefined threshold using multiple joint/DL TCI states, the UE has the capability to buffer received signals at multiple TCI/QCLs simultaneously. This capability (e.g., buffering operation) may also be extended to PDCCH reception with different QCLs (e.g., QCL-D).
- QCLs e.g., QCL-D
- the UE may support reception of the same/different CORESET in the same time domain (e.g., the same symbol) assuming multiple TCI states/QCLs.
- the UE may apply at least one of the following options 3-1 to 3-2.
- reception of PDCCH may be controlled based on two QCL rules (e.g., 1st QCL/2nd QCL) (see FIG. 14).
- PDCCH repetition may be supported by linking of search spaces of PDCCH (e.g., PDCCH SS linking).
- the 1st QCL type D may be identified based on the rules of Rel. 16.
- one highest priority QCL type D may be identified.
- the priority order may be, for example, CSS > USS, CC with lower index (e.g., lower CC index) > CC with higher index (e.g., higher CC index), search space set with lower index (e.g., lower SS set index) > search space set with higher index (e.g., higher SS set index).
- the 2nd QCL type D may be identified from among the search space sets that are linked to the search space set having the 1st QCL type D. Among multiple search space sets that are candidates for the 2nd QCL type D, they may be determined according to the priority rules of Rel. 16.
- the 1st QCL is applied to CSS#1 of cell#1, USS#3 of cell#1, and USS#4 of cell#1, and the 2nd QCL is applied to USS#2 of cell#1.
- reception of PDCCH may be supported based on two QCL rules (e.g., 1st QCL/2nd QCL) (see FIG. 15).
- the selection rule for the two QCLs may be selected/controlled based on a predetermined order (or a priority order).
- the predetermined order (or priority order) may be CSS > USS, CC with a lower index (e.g., lower CC index) > CC with a higher index (e.g., higher CC index), or search space set with a lower index (e.g., lower SS set index) > search space set with a higher index (e.g., higher SS set index).
- the UE may determine the two search space set indexes based on a predetermined order (or a priority order).
- the priority may be determined by preferentially selecting one or both of the two indicated joint/DL TCI states.
- each CORESET may be set by an RRC parameter.
- a CORESET corresponding to a CSS may not apply the specified TCI state (e.g., command joint/DL TCI state), but may apply the TCI state set in each CORESET. In this way, cases in which different CORESETs use different TCI states may exist even in Rel. 18 and later.
- the third embodiment may be limited to cases where the UE can buffer received signals using multiple TCI/QCLs simultaneously.
- 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 by the UE from the BS) 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 notified by 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 enabling switching between single TRP and multi-TRP when using a unified TCI state, any RRC parameters for a specific release (e.g., Rel. 18/19), etc.
- the UE may apply, for example, the behavior of Rel. 15/16/17.
- a terminal having a receiving unit that receives downlink control information (DCI) indicating a unified Transmission Configuration Indication (TCI state) and at least one of a downlink (DL) channel and a DL reference signal scheduled or triggered by the DCI, and a control unit that applies, when only one unified TCI state is indicated in a cell or a bandwidth part (BWP), the one unified TCI state to at least one of the DL channel and the DL reference signal, and applies one of the plurality of unified TCI states or the plurality of unified TCI states to at least one of the DL channel and the DL reference signal when indication of multiple unified TCI states is supported in the cell or the BWP.
- DCI downlink control information
- TCI state Transmission Configuration Indication
- DL downlink
- BWP bandwidth part
- control unit 1-4 When an indication of multiple unified TCI states is supported in the cell or the BWP, the control unit switches between a reception process using one of the multiple unified TCI states and a reception process using the multiple unified TCI states.
- a receiving unit for receiving at least one of a first downlink (DL) signal scheduled or triggered by a first downlink control information (DCI) corresponding to a first control resource set pool index and a second downlink (DL) signal scheduled or triggered by a second downlink control information (DCI) corresponding to a second control resource set pool index; and a control unit for applying, to the first DL signal or the second DL signal, both of a first TCI state corresponding to the first control resource set pool index and a second TCI state corresponding to the second control resource set pool index, or one of the first TCI state and the second TCI state, when one unified Transmission Configuration Indication (TCI state) is indicated for the first control resource set pool index and the second control resource set pool index.
- TCI state Transmission Configuration Indication
- Appendix 2-2 The terminal described in Appendix 2-1, wherein the control unit performs a first receiving process for the first DL signal or the second DL signal based on both the first unified TCI state and the second unified TCI state, and performs a second receiving process based on the unified TCI state indicated by the first DCI or the second DCI.
- Appendix 2-3 The terminal described in Appendix 2-1 or Appendix 2-2, wherein the control unit switches between a receiving process that uses one of the first unified TCI state and the second unified TCI state, and a receiving process that uses both the first unified TCI state and the second unified TCI state.
- 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. 16 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 17 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.
- the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may each be provided in one or more units.
- 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 to 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
- 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 downlink control information (DCI) indicating a unified Transmission Configuration Indication (TCI state) and at least one of a downlink (DL) channel and a DL reference signal scheduled or triggered by the DCI.
- DCI downlink control information
- the control unit 110 may apply the unified TCI state to at least one of the DL channel and the DL reference signal when only one unified TCI state is indicated in a cell or a bandwidth portion (BWP), and may apply one or more of the unified TCI states to at least one of the DL channel and the DL reference signal when indication of multiple unified TCI states is supported in a cell or a BWP.
- the transceiver 120 may transmit at least one of a first downlink (DL) signal scheduled or triggered by a first downlink control information (DCI) corresponding to a first control resource set pool index and a second downlink (DL) signal scheduled or triggered by a second downlink control information (DCI) corresponding to a second control resource set pool index.
- DL downlink
- DCI downlink control information
- DL downlink
- DCI downlink control information
- the control unit 110 may apply both the first TCI state corresponding to the first control resource set pool index and the second TCI state corresponding to the second control resource set pool index, or one of the first TCI state and the second TCI state, to the first DL signal or the second DL signal.
- the user terminal 18 is a diagram showing an example of the configuration of a user terminal according to an embodiment.
- the user terminal 20 includes a control unit 210, a transmitting/receiving unit 220, and a transmitting/receiving antenna 230.
- the control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving 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 220 may form at least one of the transmit beam and 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 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 downlink control information (DCI) indicating a unified Transmission Configuration Indication (TCI state) and at least one of a downlink (DL) channel and a DL reference signal scheduled or triggered by the DCI.
- DCI downlink control information
- the control unit 210 may apply the unified TCI state to at least one of the DL channel and the DL reference signal when only one unified TCI state is indicated in a cell or a bandwidth portion (BWP), and may apply one or more of the unified TCI states to at least one of the DL channel and the DL reference signal when indication of multiple unified TCI states is supported in a cell or a BWP.
- One unified TCI state may be associated with the physical ID (PCI) of the serving cell. If the indication of multiple unified TCI states is supported in the cell or BWP, the control unit 210 may perform a first reception process based on the multiple unified TCI states and a second reception process based on the unified TCI state indicated by the DCI. If the indication of multiple unified TCI states is supported in the cell or BWP, the control unit 210 may switch between the reception process using one of the multiple unified TCI states and the reception process using the multiple unified TCI states.
- PCI physical ID
- the transceiver 220 may receive at least one of a first downlink (DL) signal scheduled or triggered by a first downlink control information (DCI) corresponding to a first control resource set pool index and a second downlink (DL) signal scheduled or triggered by a second downlink control information (DCI) corresponding to a second control resource set pool index.
- DL downlink
- DCI downlink control information
- DL downlink
- DCI downlink control information
- the control unit 210 may apply both the first TCI state corresponding to the first control resource set pool index and the second TCI state corresponding to the second control resource set pool index, or one of the first TCI state and the second TCI state, to the first DL signal or the second DL signal.
- the control unit 210 may perform a first reception process for the first DL signal or the second DL signal based on both the first unified TCI state and the second unified TCI state, and may perform a second reception process based on the unified TCI state indicated by the first DCI or the second DCI.
- the control unit 210 may switch between a reception process that uses one of the first unified TCI state and the second unified TCI state, and a reception process that uses both the first unified TCI state and the second unified TCI state.
- the control unit 210 may apply both the first TCI state and the second TCI state to the first downlink control channel corresponding to the first DCI or the second downlink control channel corresponding to the second DCI.
- 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. 19 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).
- precoding "precoder,” “weight (precoding weight),” “Quasi-Co-Location (QCL),” “Transmission Configuration Indication state (TCI state),” "spatial relation,” “spatial domain filter,” “transmit power,” “phase rotation,” “antenna port,” “antenna port group,” “layer,” “number of layers,” “rank,” “resource,” “resource set,” “resource group,” “beam,” “beam width,” “beam angle,” “antenna,” “antenna element,” and “panel” may be used interchangeably.
- 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. 20 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, a rotation speed 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, a rotation speed 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 an element using a designation such as "first,” “second,” etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and 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” may also be considered to mean “deciding” to resolve, select, choose, establish, compare, etc.
- judgment may also be considered to mean “deciding” to take some kind of action.
- 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 refers to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other.
- the coupling or connection between the elements may be physical, logical, or a combination thereof. For example, “connected” may be read as "access.”
- 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.”
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
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。
<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状態の適用の一例について説明する。
CC/BWPにおいて、指示ジョイント/DL TCI状態が1つしかない場合、UEは、CC/BWPにおける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。
CC/BWPにおいて、2つの指示ジョイント/DL TCI状態がある場合、DCI(例えば、DCIフォーマット1_1/1_2)に含まれるDCIフィールドは、UEがCC/BWPにおけるPDSCH受信に最初のジョイント/DL TCI状態、2番目のジョイント/DL TCI状態、又はその両方を適用することを通知するために利用されてもよい。DCIフィールドの存在(又は、DCIフィールドの有無)について、RRCにより設定可能であってもよい。DCIフォーマット1_1/1_2において、DCIフィールドが存在しない場合、UEは、CC/BWPにおけるPDSCH受信に、両方の指示ジョイント/DL TCI状態を適用してもよい。
上述した動作#1/動作#2において、CC/BWPにおいて1つの指示ジョイント/DL TCI状態が設定/サポートされる場合は、既存システム(例えば、Rel.17)の動作が適用(例えば、Rel.17の動作にフォールバック)されてもよい。
あるいは、複数(例えば、2つ)のジョイント/DL TCI状態を想定して受信信号のバッファリングを行うか(バッファリング動作#1)、1つのジョイントDL/TCI状態を想定して受信信号のバッファリングを行うか(バッファリング動作#2)、が切り替えて適用されてもよい。バッファリング動作は、受信動作と読み替えられてもよい。
上位レイヤシグナリング/MAC CE/DCIにより、バッファリング動作#1とバッファリング動作#2の一方が設定/アクティブ化/指示されてもよい。
設定/サポートされる指示ジョイント/DL TCI状態(例えば、指示ジョイント/DL TCI状態の数)に基づいて、バッファリング動作#1とバッファリング動作#2のいずれが適用されるかが決定されてもよい。
UE能力(例えば、UE capability)により、バッファリング動作#1とバッファリング動作#2のいずれが適用されるかを報知してもよい。
受信する周波数領域/時間領域に基づいて、バッファリング動作#1とバッファリング動作#2のいずれが適用されるかを判断してもよい。例えば、所定のCC/BWP/スロット/シンボルにおける受信か、それ以外のCC/BWP/スロット/シンボルにおける受信であるかに基づいて、バッファリング動作#1とバッファリング動作#2のいずれが適用されるかを判断してもよい。
なお、上記説明はPDSCHを例に挙げて説明したが、適用可能なチャネル/信号はPDSCHに限られない。例えば、非周期CSI-RS(例えば、A-CSI-RS)に適用されてもよい。この場合、PDSCHをA-CSI-RSに読み替えて第1の実施形態を適用してもよい。この場合、所定閾値(例えば、timeDurationForQCL)ではなく、ビームスイッチタイミング(例えば、beamSwitchTiming)としてもよい。
Rel.17の統一TCIでは、スケジューリングオフセット<所定閾値(例えば、timeDurationForQCL)の場合、指示ジョイント/DL TCI状態がサービングセルPCIに対応するのであれば指示ジョイント/DL TCI状態を適用し、それ以外の場合Rel.15のデフォルトQCLルールが適用される。
指示ジョイント/DL TCI状態が適用されてもよい。例えば、サービングセルPCIに関わらず指示ジョイント/DL TCI状態が適用されてもよい。
指示ジョイント/DL TCI状態がサービングセルPCIに対応する場合、当該指示ジョイント/DL TCI状態が適用され、それ以外の場合はシングルDCIベースのマルチTRPに対するRel.16デフォルトQCLが適用されてもよい。シングルDCIベースのマルチTRPに対するRel.16デフォルトQCLは、PDSCHのTCI/QCLに対して2つのアクティブTCI状態を有するTCIコードポイント(例えば、TCI状態フィールドのコードポイント)のうち最低のTCIコードポイント(例えば、lowest TCI codepoint)のTCI/QCLであってもよい。
第2の実施形態は、マルチDCIベースのマルチTRPにおける統一TCI状態の適用の一例について説明する。
各CORESETプールインデックス(例えば、#0と#1)にそれぞれ対応する2つの指示ジョイント/DL TCI状態を利用して、受信信号のバッファリング(又は、受信処理)を行ってもよい。
複数(例えば、2つ)のCORESETプールインデックス(例えば、#0と#1)のうち、いずれか1つ(又は、片方)のCORESETプールインデックスに対応する指示ジョイント/DL TCI状態を利用して、受信信号のバッファリング(又は、受信処理)を行ってもよい。
オプション2-1の動作(例えば、バッファリング動作#1)とオプション2-2の動作(バッファリング動作#2)は切り替えて適用されてもよい。UEは、以下の切り替えルール#2-1~切り替えルール#2-4の少なくとも一つに基づいて切り替えを制御してもよい。
上位レイヤシグナリング/MAC CE/DCIにより、オプション2-1の動作(例えば、バッファリング動作#1)とオプション2-2の動作(バッファリング動作#2)の一方が設定/アクティブ化/指示されてもよい。
設定/サポートされる指示ジョイント/DL TCI状態(例えば、指示ジョイント/DL TCI状態の数)に基づいて、オプション2-1の動作(例えば、バッファリング動作#1)とオプション2-2の動作(バッファリング動作#2)のいずれが適用されるかが決定されてもよい。
UE能力(例えば、UE capability)により、オプション2-1の動作(例えば、バッファリング動作#1)とオプション2-2の動作(バッファリング動作#2)のいずれが適用されるかを報知してもよい。
受信する周波数領域/時間領域に基づいて、オプション2-1の動作(例えば、バッファリング動作#1)とオプション2-2の動作(バッファリング動作#2)のいずれが適用されるかを判断してもよい。例えば、所定のCC/BWP/スロット/シンボルにおける受信か、それ以外のCC/BWP/スロット/シンボルにおける受信であるかに基づいて、オプション2-1の動作(例えば、バッファリング動作#1)とオプション2-2の動作(バッファリング動作#2)のいずれが適用されるかを判断してもよい。
なお、上記説明はPDSCHを例に挙げて説明したが、適用可能なチャネル/信号はPDSCHに限られない。例えば、非周期CSI-RS(例えば、A-CSI-RS)に適用されてもよい。この場合、PDSCHをA-CSI-RSに読み替えて第2の実施形態を適用してもよい(図13参照)。この場合、所定閾値(例えば、timeDurationForQCL)ではなく、ビームスイッチタイミング(例えば、beamSwitchTiming)としてもよい。図13は、オプション2-1をA-CSI-RSに適用する場合の一例を示している。もちろん、オプション2-2/2-3がA-CSI-RSに適用されてもよい。
CORESETプールインデックス毎に1つのジョイント/DL TCI状態が指示された場合、もしいずれか/両方の指示ジョイント/DL TCI状態がサービングセル(又は、サービングセルPCI)以外の他のセル(又は、PCH)に対応する場合、上述したオプション2-1~オプション2-3(PDSCHをA-CSI-RSに読み替えた場合も含む)の少なくとも一つが適用されてもよい。
Rel.17の統一TCIでは、スケジューリングオフセット<所定閾値(例えば、timeDurationForQCL)の場合、指示ジョイント/DL TCI状態がサービングセルPCIに対応するのであれば指示ジョイント/DL TCI状態を適用し、それ以外の場合Rel.15のデフォルトQCLルールが適用される。
指示ジョイント/DL TCI状態が適用されてもよい。例えば、サービングセルPCIに関わらず指示ジョイント/DL TCI状態が適用されてもよい。
指示ジョイント/DL TCI状態がサービングセルPCIに対応する場合、当該指示ジョイント/DL TCI状態が適用され、それ以外の場合はマルチDCIベースのマルチTRPに対するRel.16デフォルトQCLが適用されてもよい。マルチDCIベースのマルチTRPに対するRel.16デフォルトQCLは、各CORESETプールインデックス毎に、最新のモニタリングスロットにおける最小CORESET IDに対応するTCI/QCLであってもよい。
第3の実施形態は、異なるQCL(例えば、QCL-D)を有するPDCCH受信(又は、PDCCH繰り返し)の一例について説明する。
既存システム(例えば、Rel.17)のPDCCH繰り返し(例えば、Rel.17 PDCCH repetition)が設定される場合、2つのQCLルール(例えば、1st QCL/2nd QCL)に基づいてそれぞれPDCCHの受信を制御してもよい(図14参照)。PDCCH繰り返しは、PDCCHのサーチスペースのリンク(例えば、PDCCH SS linking)によりサポートされてもよい。
また、既存システム(例えば、Rel.17)のPDCCH繰り返し(例えば、PDCCHのサーチスペースのリンク)が設定されない場合についても、2つのQCLルール(例えば、1st QCL/2nd QCL)に基づいてPDCCHの受信がサポートされてもよい(図15参照)。
[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に関して、以下の発明を付記する。
[付記1-1]
統一Transmission Configuration Indication(TCI状態)を指示する下り制御情報(DCI)と、前記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一つと、を受信する受信部と、セル又は帯域幅部分(BWP)において1つの統一TCI状態のみ指示される場合、前記1つの統一TCI状態を前記DLチャネル及び前記DL参照信号の少なくとも一つに適用し、前記セル又は前記BWPにおいて複数の統一TCI状態の指示がサポートされる場合、前記複数の統一TCI状態の1つ又は前記複数の統一TCI状態を前記DLチャネル及び前記DL参照信号の少なくとも一つに適用する制御部と、を有する端末。
[付記1-2]
前記1つの統一TCI状態は、サービングセルの物理ID(PCI)に関連づけられる付記1-1に記載の端末。
[付記1-3]
前記セル又は前記BWPにおいて複数の統一TCI状態の指示がサポートされる場合、前記制御部は、前記複数の統一TCI状態に基づいて第1の受信処理を行い、前記DCIで指示される統一TCI状態に基づいて第2の受信処理を行う付記1-1又は付記1-2に記載の端末。
[付記1-4]
前記セル又は前記BWPにおいて複数の統一TCI状態の指示がサポートされる場合、前記制御部は、前記複数の統一TCI状態の1つを利用する受信処理と、前記複数の統一TCI状態を利用する受信処理と、を切り替えて適用する付記1-1から付記1-3のいずれかに記載の端末。
第1の制御リソースセットプールインデックスに対応する第1の下り制御情報(DCI)でスケジュール又はトリガされる第1の下りリンク(DL)信号と、第2の制御リソースセットプールインデックスに対応する第2の下り制御情報(DCI)でスケジュール又はトリガされる第2の下りリンク(DL)信号と、と少なくとも一つを受信する受信部と、前記第1の制御リソースセットプールインデックス及び前記第2の制御リソースセットプールインデックス毎に1つの統一Transmission Configuration Indication(TCI状態)が指示される場合、前記第1のDL信号又は前記第2のDL信号に対して、前記第1の制御リソースセットプールインデックスに対応する第1のTCI状態と前記第2の制御リソースセットプールインデックスに対応する第2のTCI状態の両方、又は、前記第1のTCI状態と前記第2のTCI状態の一方を適用する制御部と、を有する端末。
[付記2-2]
前記制御部は、前記第1のDL信号又は前記第2のDL信号に対して、前記第1の統一TCI状態及び前記第2の統一TCI状態の両方に基づいて第1の受信処理を行い、前記第1のDCI又は前記第2のDCIで指示される統一TCI状態に基づいて第2の受信処理を行う付記2-1に記載の端末。
[付記2-3]
前記制御部は、前記第1の統一TCI状態及び前記第2の統一TCI状態の一方を利用する受信処理と、前記第1の統一TCI状態及び前記第2の統一TCI状態の両方を利用する受信処理と、を切り替えて適用する付記2-1又は付記2-2に記載の端末。
[付記2-4]
前記制御部は、前記第1のDCIに対応する第1の下り制御チャネル又は前記第2のDCIに対応する第2の下り制御チャネルに対して、前記第1のTCI状態及び前記第2のTCI状態の両方を適用する付記2-1から付記2-3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17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18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)
- 統一Transmission Configuration Indication(TCI状態)を指示する下り制御情報(DCI)と、前記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一つと、を受信する受信部と、
セル又は帯域幅部分(BWP)において1つの統一TCI状態のみ指示される場合、前記1つの統一TCI状態を前記DLチャネル及び前記DL参照信号の少なくとも一つに適用し、前記セル又は前記BWPにおいて複数の統一TCI状態の指示がサポートされる場合、前記複数の統一TCI状態の1つ又は前記複数の統一TCI状態を前記DLチャネル及び前記DL参照信号の少なくとも一つに適用する制御部と、を有する端末。 - 前記1つの統一TCI状態は、サービングセルの物理ID(PCI)に関連づけられる請求項1に記載の端末。
- 前記セル又は前記BWPにおいて複数の統一TCI状態の指示がサポートされる場合、前記制御部は、前記複数の統一TCI状態に基づいて第1の受信処理を行い、前記DCIで指示される統一TCI状態に基づいて第2の受信処理を行う請求項1に記載の端末。
- 前記セル又は前記BWPにおいて複数の統一TCI状態の指示がサポートされる場合、前記制御部は、前記複数の統一TCI状態の1つを利用する受信処理と、前記複数の統一TCI状態を利用する受信処理と、を切り替えて適用する請求項1に記載の端末。
- 統一Transmission Configuration Indication(TCI状態)を指示する下り制御情報(DCI)と、前記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一つと、を受信する工程と、
セル又は帯域幅部分(BWP)において1つの統一TCI状態のみ指示される場合、前記1つの統一TCI状態を前記DLチャネル及び前記DL参照信号の少なくとも一つに適用し、前記セル又は前記BWPにおいて複数の統一TCI状態の指示がサポートされる場合、前記複数の統一TCI状態の1つ又は前記複数の統一TCI状態を前記DLチャネル及び前記DL参照信号の少なくとも一つに適用する工程と、を有する端末の無線通信方法。 - 統一Transmission Configuration Indication(TCI状態)を指示する下り制御情報(DCI)と、前記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一つと、を送信する送信部と、
セル又は帯域幅部分(BWP)において1つの統一TCI状態のみ指示される場合、前記1つの統一TCI状態を前記DLチャネル及び前記DL参照信号の少なくとも一つに適用し、前記セル又は前記BWPにおいて複数の統一TCI状態の指示がサポートされる場合、前記複数の統一TCI状態の1つ又は前記複数の統一TCI状態を前記DLチャネル及び前記DL参照信号の少なくとも一つに適用する制御部と、を有する基地局。
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202280102427.5A CN120266413A (zh) | 2022-11-04 | 2022-11-04 | 终端、无线通信方法以及基站 |
| JP2024554077A JPWO2024095477A1 (ja) | 2022-11-04 | 2022-11-04 | |
| PCT/JP2022/041236 WO2024095477A1 (ja) | 2022-11-04 | 2022-11-04 | 端末、無線通信方法及び基地局 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2022/041236 WO2024095477A1 (ja) | 2022-11-04 | 2022-11-04 | 端末、無線通信方法及び基地局 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024095477A1 true WO2024095477A1 (ja) | 2024-05-10 |
Family
ID=90929962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2022/041236 Ceased WO2024095477A1 (ja) | 2022-11-04 | 2022-11-04 | 端末、無線通信方法及び基地局 |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2024095477A1 (ja) |
| CN (1) | CN120266413A (ja) |
| WO (1) | WO2024095477A1 (ja) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022220109A1 (ja) * | 2021-04-16 | 2022-10-20 | 株式会社Nttドコモ | 端末、無線通信方法及び基地局 |
-
2022
- 2022-11-04 WO PCT/JP2022/041236 patent/WO2024095477A1/ja not_active Ceased
- 2022-11-04 JP JP2024554077A patent/JPWO2024095477A1/ja active Pending
- 2022-11-04 CN CN202280102427.5A patent/CN120266413A/zh active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022220109A1 (ja) * | 2021-04-16 | 2022-10-20 | 株式会社Nttドコモ | 端末、無線通信方法及び基地局 |
Non-Patent Citations (2)
| Title |
|---|
| MODERATOR (MEDIATEK): "Moderator summary on extension of unified TCI framework (Round 0)", 3GPP DRAFT; R1-2210243, 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, 12 October 2022 (2022-10-12), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052259711 * |
| NTT DOCOMO, INC: "Discussion on unified TCI framework extension for multi-TRP", 3GPP DRAFT; R1-2209888, 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), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052259361 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN120266413A (zh) | 2025-07-04 |
| JPWO2024095477A1 (ja) | 2024-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP7730382B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
| JP7737477B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
| JP7783291B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
| JP7742885B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
| JP7717820B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
| JP7748469B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
| JP7717819B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
| WO2024095416A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024095415A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024095417A1 (ja) | 端末、無線通信方法及び基地局 | |
| JP7783915B2 (ja) | 端末、無線通信方法及びシステム | |
| JP7783305B2 (ja) | 端末、無線通信方法、基地局及びシステム | |
| WO2024095477A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024095478A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024069968A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024185636A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024171373A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024100733A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024181346A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024236709A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024171374A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024219414A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024261990A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024261989A1 (ja) | 端末、無線通信方法及び基地局 | |
| WO2024095414A1 (ja) | 端末、無線通信方法及び基地局 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22964493 Country of ref document: EP Kind code of ref document: A1 |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2024554077 Country of ref document: JP |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 202280102427.5 Country of ref document: CN |
|
| WWP | Wipo information: published in national office |
Ref document number: 202280102427.5 Country of ref document: CN |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 22964493 Country of ref document: EP Kind code of ref document: A1 |