WO2023209984A1 - 端末、無線通信方法及び基地局 - Google Patents
端末、無線通信方法及び基地局 Download PDFInfo
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- WO2023209984A1 WO2023209984A1 PCT/JP2022/019390 JP2022019390W WO2023209984A1 WO 2023209984 A1 WO2023209984 A1 WO 2023209984A1 JP 2022019390 W JP2022019390 W JP 2022019390W WO 2023209984 A1 WO2023209984 A1 WO 2023209984A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
Definitions
- the present disclosure relates to a terminal, a wireless communication method, and a base station in a next-generation mobile communication system.
- LTE Long Term Evolution
- 3GPP Rel. 10-14 LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of further increasing capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Releases (Rel.) 8 and 9).
- LTE Long Term Evolution
- 5G 5th generation mobile communication system
- 5G+ plus
- NR New Radio
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- UE User Equipment
- QCL quasi-co-location
- TCI state/spatial relationship
- TCI states to multiple types of signals (channels/RSs) is being considered. However, there are cases where it is not clear how to indicate/apply the TCI status. If the method of indicating the TCI status is not clear, there is a risk of deterioration in communication quality, throughput, etc.
- one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately perform TCI status indication.
- a terminal includes first downlink control information (DCI) that schedules a signal corresponding to a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) transmission opportunity, and a beam instruction corresponding to the transmission opportunity.
- DCI downlink control information
- HARQ-ACK Hybrid Automatic Repeat reQuest ACKnowledgement
- a receiving unit that receives a second DCI for the signal; and determines a first TCI state to be applied to the signal based on a first transmission configuration instruction (TCI) field included in the first DCI.
- TCI transmission configuration instruction
- each of the first TCI state and the second TCI state is a TCI state applied to both a downlink (DL) signal and an uplink (UL) signal, or a TCI state applied to the DL signal. It is characterized by being a TCI state and a TCI state applied to UL signals.
- TCI status indication can be appropriately performed.
- 1A and 1B are diagrams illustrating an example of communication between a mobile object and a transmission point (eg, RRH).
- 2A to 2C are diagrams illustrating examples of schemes 0 to 2 regarding SFN.
- 3A and 3B are diagrams illustrating an example of scheme 1.
- 4A to 4C are diagrams illustrating an example of a Doppler precompensation scheme.
- FIG. 5 is a diagram illustrating an example of simultaneous beam updating across multiple CCs.
- 6A and 6B are diagrams illustrating an example of a common beam.
- FIG. 7 shows Rel.
- 17 is a diagram illustrating an example of BAT defined in 17.
- FIG. 8 is a diagram illustrating an example of application of TCI states when receiving multiple beam indication DCIs.
- FIGS. 9A and 9B are diagrams illustrating an example of single DCI-based multi-TRP transmission and multi-DCI-based multi-TRP transmission, respectively.
- FIG. 10A and FIG. 10B are diagrams showing an example of the TCI field within the DCI.
- FIGS. 11A and 11B are diagrams illustrating an example of setting/instructing a joint TCI state in a single DCI-based multi-TRP.
- FIGS. 12A and 12B are diagrams illustrating an example of setting/instructing a separate TCI state in a single DCI-based multi-TRP.
- FIGS. 13A and 13B are diagrams illustrating an example of setting/instructing a joint TCI state corresponding to a first value of the CORESET pool index in a multi-DCI-based multi-TRP.
- FIGS. 14A and 14B are diagrams illustrating an example of setting/instructing a joint TCI state corresponding to a second value of the CORESET pool index in a multi-DCI-based multi-TRP.
- 15A to 15D are diagrams illustrating an example of TCI status indications according to option 1-A/1-B.
- FIG. 16 is a diagram illustrating an example of application of the TCI state according to the first embodiment.
- FIG. 17 is a diagram illustrating an example of a TCI state instruction according to a modification of the first embodiment.
- FIG. 18 is a diagram showing another example of the TCI state instruction according to the modification of the first embodiment.
- FIG. 19 is a diagram showing another example of the TCI state instruction according to the modification of the first embodiment.
- FIG. 20 is a diagram illustrating an example of fields of the DCI according to the second embodiment.
- 21A to 21D are diagrams illustrating an example of switching between single TRP and multi-TRP according to the second embodiment.
- FIG. 22 is a diagram illustrating an example of dynamic switching of the DCI size according to the second embodiment.
- FIG. 23 is a diagram illustrating an example of switching between single/multi-TRP mode according to the second embodiment.
- FIG. 24 is a diagram illustrating another example of switching between single/multi-TRP mode according to the second embodiment.
- FIG. 25 is a diagram illustrating another example of switching between single/multi-TRP mode according to the second embodiment.
- FIG. 26 is a diagram showing another example of switching between single/multi-TRP mode according to option 2-2.
- FIG. 27 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 28 is a diagram illustrating an example of the configuration of a base station according to an embodiment.
- FIG. 29 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment.
- FIG. 30 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment.
- FIG. 31 is a diagram illustrating an example of a vehicle according to an embodiment.
- the UE performs reception processing (e.g. reception, demapping, demodulation, Controlling at least one of decoding), transmission processing (eg, at least one of transmission, mapping, precoding, modulation, and encoding) is being considered.
- reception processing e.g. reception, demapping, demodulation, Controlling at least one of decoding
- transmission processing e.g, at least one of transmission, mapping, precoding, modulation, and encoding
- the TCI states may represent those that apply to downlink signals/channels. What corresponds to the TCI state applied to uplink signals/channels may be expressed as a spatial relation.
- the TCI state is information regarding quasi-co-location (QCL) of signals/channels, and may also be called spatial reception parameters, spatial relation information, etc.
- the TCI state may be set in the UE on a per-channel or per-signal basis.
- QCL is an index that indicates the statistical properties of a signal/channel. For example, when one signal/channel and another signal/channel have a QCL relationship, the Doppler shift, Doppler spread, and average delay are calculated between these different signals/channels. ), delay spread, and spatial parameters (e.g., spatial Rx parameters) can be assumed to be the same (QCL with respect to at least one of these). You may.
- the spatial reception parameters may correspond to the UE's reception beam (eg, reception analog beam), and the beam may be identified based on the spatial QCL.
- QCL or at least one element of QCL in the present disclosure may be read as sQCL (spatial QCL).
- QCL types A plurality of types (QCL types) may be defined for QCL.
- QCL types A-D may be provided with different parameters (or parameter sets) that can be assumed to be the same, and the parameters (which may be referred to as QCL parameters) are shown below: ⁇ QCL type A (QCL-A): Doppler shift, Doppler spread, average delay and delay spread, ⁇ QCL type B (QCL-B): Doppler shift and Doppler spread, ⁇ QCL type C (QCL-C): Doppler shift and average delay, - QCL type D (QCL-D): Spatial reception parameters.
- 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, It may also be called a QCL assumption.
- QCL Control Resource Set
- the UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for the signal/channel based on the TCI state 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 a target channel (in other words, a reference signal (RS) for the channel) and another signal (for example, another RS). .
- the TCI state may be set (indicated) by upper layer signaling, physical layer signaling, or a combination thereof.
- the physical layer signaling may be, for example, downlink control information (DCI).
- DCI downlink control information
- Channels for which TCI states or spatial relationships are set are, for example, Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), and Uplink Shared Channel (Physical Uplink Shared Channel).
- the channel may be at least one of a physical uplink control channel (PUCCH) and a physical uplink control channel (PUCCH).
- the RS that has a QCL relationship with the channel is, for example, a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a measurement reference signal (Sounding
- the signal may be at least one of a tracking reference signal (SRS), a tracking CSI-RS (also referred to as a tracking reference signal (TRS)), and a QCL detection reference signal (also referred to as a QRS).
- SRS tracking reference signal
- TRS tracking reference signal
- QRS QCL detection reference signal
- the 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 RS of QCL type X in a TCI state may mean an RS that has a QCL type It's okay.
- QCL type A RS is always set for PDCCH and PDSCH, and QCL type D RS may be additionally set. Since it is difficult to estimate Doppler shift, delay, etc. by receiving one shot of DMRS, QCL type A RS is used to improve channel estimation accuracy. QCL type D RS is used for receiving beam determination during DMRS reception.
- TRS1-1, 1-2, 1-3, and 1-4 are transmitted, and TRS1-1 is notified as a QCL type C/D RS depending on the TCI state of the PDSCH.
- the UE can use information obtained from past periodic TRS1-1 reception/measurement results for PDSCH DMRS reception/channel estimation.
- the QCL source for PDSCH is TRS1-1
- the QCL target is DMRS for PDSCH.
- the PDSCH may be scheduled with a DCI having a TCI field.
- the TCI state for PDSCH is indicated by the TCI field.
- the TCI field of DCI format 1-1 has 3 bits, and the TCI field of DCI format 1-2 has a maximum of 3 bits.
- the UE In RRC connected mode, if the first intra-DCI TCI information element (upper layer parameter tci-PresentInDCI) is set to "enabled" for a CORESET that schedules a PDSCH, the UE shall It is assumed that a TCI field exists in the DCI format 1_1 of the transmitted PDCCH.
- upper layer parameter tci-PresentInDCI upper layer parameter
- the UE can determine the DCI format of the PDSCH transmitted in the CORESET. Assume that there is a TCI field in DCI 1_2 with the DCI field size indicated by the second intra-DCI TCI information element.
- the PDSCH may be scheduled with a DCI without a TCI field.
- the DCI format of the DCI is DCI format 1_0, or DCI format 1_1/1_2 in the case where the intra-DCI TCI information element (upper layer parameter tci-PresentInDCI or tci-PresentInDCI-1-2) is not set (enabled). It's okay.
- a PDSCH is scheduled with a DCI that does not have a TCI field, and if the DL is greater than or equal to a threshold (timeDurationForQCL), 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). .
- a threshold timeDurationForQCL
- the TCI state (default TCI state) of the PDSCH is the TCI state of the lowest CORESET ID in the latest slot in the active DL BWP of that CC (of a specific UL signal). It may be. 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.
- MAC CEs are required: a MAC CE for activation/deactivation related to PUCCH space and a MAC CE for activation/deactivation related to SRS space.
- PUSCH spatial relationships follow SRS spatial relationships.
- At least one of the MAC CE for activation/deactivation related to PUCCH space and the MAC CE for activation/deactivation related to SRS space may not be used.
- both the spatial relationship and PL-RS for PUCCH are not configured in FR2 (applicable condition, second condition), default assumption of spatial relationship and PL-RS for PUCCH (default spatial relationship and default PL-RS) applies.
- both the spatial relationship for SRS (SRS resource for SRS, or SRS resource corresponding to SRI in DCI format 0_1 that schedules PUSCH) and PL-RS are not configured (applicable condition, second condition)
- Default assumptions of spatial relationship and PL-RS (default spatial relationship and default PL-RS) apply for PUSCH and SRS scheduled by DCI format 0_1.
- the default spatial relationship and default PL-RS are based on the TCI state or QCL assumption of the CORESET with the lowest CORESET ID in the active DL BWP. There may be. If no CORESET is 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 the active DL BWP.
- the spatial relationship of PUSCH 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 relationships on all SCells even if no PUCCH is transmitted on the SCell.
- the application conditions for the default spatial relationship/default PL-RS for SRS may include that the default beam path loss enable information element for SRS (upper layer parameter enableDefaultBeamPlForSRS) is set to valid.
- the application condition of the default spatial relationship/default PL-RS for PUCCH may include that the default beam path loss enable information element for PUCCH (upper layer parameter enableDefaultBeamPlForPUCCH) is set to valid.
- the application condition for the default spatial relationship/default PL-RS for PUSCH scheduled by DCI format 0_0 is that the default beam path loss enable information element for PUSCH scheduled by DCI format 0_0 (upper layer parameter enableDefaultBeamPlForPUSCH0_0) is set to valid. It may also include.
- the RRC parameter (parameter for enabling default beam PL for PUCCH (enableDefaultBeamPL-ForPUCCH), parameter for enabling default beam PL for PUSCH (enableDefaultBeamPL-ForPUSCH0_0)), or SRS If the parameter (enableDefaultBeamPL-ForSRS) is configured and no spatial relationship or PL-RS is configured, the UE applies the default spatial relationship/PL-RS.
- the above thresholds are: time duration for QCL, “timeDurationForQCL”, “Threshold”, “Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI”, “Threshold hold-Sched-Offset”, “ beamSwitchTiming, schedule offset threshold, scheduling offset threshold, etc.
- the threshold may be reported by the UE as the UE capability (per subcarrier interval).
- the offset (scheduling offset) between the reception of DL DCI and the corresponding PDSCH is smaller than the threshold timeDurationForQCL, and at least one TCI state configured for the serving cell of the scheduled PDSCH is "QCL type D" and the UE is configured with two default TCI enable information elements (enableTwoDefaultTCIStates-r16) and at least one TCI code point (code point of the TCI field in the DL DCI) indicates two TCI states.
- the DMRS port of the serving cell's PDSCH or PDSCH transmission occasion is QCLed with the RS with respect to the QCL parameters associated with the two TCI states corresponding to the lowest code point of the TCI code points containing the two different TCI states ( quasi co-located) (2 default QCL assumption decision rule).
- 2 Default TCI Enablement Information Element indicates the Rel. 16 operation is enabled.
- a default TCI state for single TRP As the default TCI state of PDSCH in 15/16, a default TCI state for single TRP, a default TCI state for multi-TRP based on multi-DCI, and a default TCI state for multi-TRP based on single DCI are specified.
- the default TCI state of aperiodic CSI-RS (A (periodic)-CSI-RS) in 15/16 is the default TCI state for single TRP, the default TCI state for multi-TRP based on multi-DCI, and the default TCI state for multi-TRP based on single DCI.
- a default TCI state for multi-TRP is specified.
- Multi TRP In NR, one or more Transmission/Reception Points (TRPs) (multi TRPs (MTRPs)) communicate with the UE using one or more panels (multi-panels). DL transmission is being considered. Further, it is being considered that the UE performs UL transmission using one or more panels for one or more TRPs.
- TRPs Transmission/Reception Points
- multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or may correspond to different cell IDs.
- the cell ID may be a physical cell ID or a virtual cell ID.
- Multi-TRPs may be connected by an ideal/non-ideal backhaul, and information, data, etc. may be exchanged.
- Each TRP of the multi-TRP may transmit a different code word (CW) and a different layer.
- NJT Non-Coherent Joint Transmission
- NJT Non-Coherent Joint Transmission
- TRP #1 modulates and layer-maps a first codeword to a first number of layers (e.g., 2 layers) to transmit a first PDSCH using a first precoding.
- TRP #2 modulates and maps the second codeword, performs layer mapping, and transmits the second PDSCH using a second number of layers (eg, 2 layers) using a second precoding.
- multiple PDSCHs to be NCJTed may be defined as partially or completely overlapping in at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap in at least one of time and frequency resources.
- first PDSCH and second PDSCH may be assumed not to be in a quasi-co-location (QCL) relationship.
- Reception of multiple PDSCHs may also be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (for example, QCL type D).
- Multiple PDSCHs from multiple TRPs may be scheduled using one DCI (single DCI, single PDCCH) (single master mode, based on single DCI).
- Multi-TRP single-DCI based multi-TRP.
- Multiple PDSCHs from multiple TRPs may be scheduled using multiple DCIs (multi-DCI, multiple PDCCH), respectively (multi-master mode, multi-DCI based multi-DCI). TRP)).
- PDSCH transport block (TB) or codeword (CW) repetition across multiple TRPs
- repetition schemes URLLC schemes, e.g. Schemes 1, 2a, 2b, 3, 4
- SDM space division multiplexed
- FDM frequency division multiplexed
- RV redundancy version
- the RVs may be the same or different for multiple TRPs.
- multiple PDSCHs from multiple TRPs are time division multiplexed (TDM).
- TDM time division multiplexed
- multiple PDSCHs from multiple TRPs are transmitted within one slot.
- multiple PDSCHs from multiple TRPs are transmitted in different slots.
- one control resource set (CORESET) in the PDCCH configuration information (PDCCH-Config) may correspond to one TRP.
- the UE may determine that the multi-TRP is based on multi-DCI.
- TRP may be replaced with CORESET pool index.
- CORESET pool index A CORESET pool index of 1 is set.
- Two different values eg, 0 and 1) of the CORESET pool index are set.
- the UE may determine multi-TRP based on single DCI.
- the two TRPs may be translated into two TCI states indicated by the MAC CE/DCI.
- the "Enhanced TCI States Activation/Deactivation for UE-specific PDSCH MAC CE (Enhanced TCI States Activation/Deactivation for UE- specific PDSCH MAC CE) is used.
- the DCI for common beam indication may be a UE-specific DCI format (for example, DL DCI format (for example, 1_1, 1_2), UL DCI format (for example, 0_1, 0_2)), or a UE-group common (UE-group Common) DCI format may be used.
- DL DCI format for example, 1_1, 1_2
- UL DCI format for example, 0_1, 0_2
- UE-group Common UE-group Common
- Multi-TRP PDCCH For the reliability of multi-TRP PDCCH based on non-single frequency network (SFN), the following considerations 1 to 3 are considered.
- SFN non-single frequency network
- the following considerations 1 to 3 are considered.
- Encoding/rate matching is based on one repetition, and the same coded bits are repeated in other repetitions.
- Each repetition has the same number of control channel elements (CCEs), the same coded bits, and corresponds to the same DCI payload.
- CCEs control channel elements
- Two or more PDCCH candidates are explicitly linked to each other. The UE knows the link before decoding.
- Two sets of PDCCH candidates (within a given search space (SS) set) are respectively associated with two TCI states of the CORESET.
- the same CORESET, the same SS set, and PDCCH repetition in different monitoring occasions are used.
- Two sets of PDCCH candidates are associated with two SS sets, respectively. Both SS sets are associated with a CORESET, and each SS set is associated with only one TCI state of that CORESET. Here, the same CORESET, two SS sets, is used.
- CORESETPoolIndex which may be called TRP information (TRP Info)
- TRP Info TRP information
- a CORESET pool index is set for each CORESET.
- SFN single frequency network
- RRC signaling/MAC CE upper layer signaling
- SFN contributes to at least one of the operation and reliability improvement of HST (high speed train).
- each search space set is associated with a corresponding CORESET (enhancement 2 ).
- the two search space sets may be associated with the same or different CORESETs.
- One (maximum one) TCI state can be set/activated for one CORESET using upper layer signaling (RRC signaling/MAC CE).
- two search space sets are associated with different CORESETs with different TCI states, it may mean repeated transmission of multiple TRPs. If two search space sets are associated with the same CORESET (CORESET with the same TCI state), it may mean repeated transmission of a single TRP.
- HST high speed train
- the large antenna transmits outside/inside the tunnel.
- the transmission power of a large antenna is about 1 to 5W.
- the transmission power of a small antenna is about 250 mW.
- Multiple small antennas (transmission/reception points) with the same cell ID and a distance of 300 m form a single frequency network (SFN). All small antennas within an SFN transmit the same signal at the same time on the same PRB. It is assumed that a terminal transmits and receives data to and from one base station. In reality, multiple transmitting and receiving points transmit the same DL signal.
- transmission and reception points in units of several kilometers form one cell. Handover is performed when crossing cells. This allows the frequency of handovers to be reduced.
- NR data is transmitted from a transmission point (e.g., RRH) in order to communicate with a terminal (hereinafter also referred to as UE) included in a mobile object such as a high-speed train (HST) that moves at high speed. It is assumed that beams will be used.
- a transmission point e.g., RRH
- UE terminal
- HST high-speed train
- Existing systems eg, Rel. 15
- FIG. 1A shows a case where RRHs are installed along the moving route (or moving direction, traveling direction, running route) of a moving body, and a beam is formed from each RRH in the moving direction of the moving body.
- An RRH that forms a beam in one direction may be referred to as a uni-directional RRH.
- the mobile receives a negative Doppler shift (-fD) from each RRH.
- the beam is not limited to this, and may be formed in the opposite direction to the direction of movement of the moving body, or the beam may be formed in the direction of movement of the moving body.
- the beam may be formed in any direction regardless of the
- a plurality of beams (for example, two or more) are transmitted from the RRH.
- beams are formed both in the traveling direction of the moving object and in the opposite direction (see FIG. 1B).
- FIG. 1B shows a case in which RRHs are installed along the moving route of a moving object, and beams are formed from each RRH both in the direction of movement of the moving object and in the direction opposite to the direction of movement.
- An RRH that forms beams in multiple directions may be referred to as a bi-directional RRH.
- the UE communicates in the same way as in single TRP.
- the mobile device when two RRHs (here, RRH #1 and RRH #2) use SFN, the mobile device receives a signal with a negative Doppler shift in the middle of the two RRHs, and the power is high.
- the signal switches to a signal that has undergone a positive Doppler shift.
- the maximum range of change in Doppler shift that requires correction is from -fD to +fD, which is twice as much as in the case of unidirectional RRH.
- a positive Doppler shift may be read as information regarding a positive Doppler shift, a Doppler shift in a positive (positive) direction, and Doppler information in a positive (positive) direction.
- the negative Doppler shift may be read as information regarding a negative Doppler shift, a negative Doppler shift, or Doppler information in a negative direction.
- the tracking reference signal (TRS), DMRS, and PDSCH are commonly transmitted (using the same time and frequency resources) to the two TRPs (RRHs) (regular SFN, transparent transparent SFN, HST-SFN).
- the UE receives a DL channel/signal corresponding to a single TRP, so there is one TCI state for the PDSCH.
- RRC parameters for distinguishing between transmission using single TRP and transmission using SFN are defined. If the UE reports the corresponding UE capability information, it may differentiate between receiving a single TRP DL channel/signal and receiving a PDSCH assuming SFN based on the RRC parameters. On the other hand, the UE may assume a single TRP and perform transmission and reception using SFN.
- the TRS is transmitted TRP-specifically (using different time/frequency resources depending on the TRP).
- TRS1 is transmitted from TRP#1
- TRS2 is transmitted from TRP#2.
- TRS and DMRS are transmitted TRP-specifically.
- TRS1 and DMRS1 are transmitted from TRP#1
- TRS2 and DMRS2 are transmitted from TRP#2.
- Schemes 1 and 2 can suppress sudden changes in Doppler shift and appropriately estimate/compensate Doppler shift. Since the DMRS of Scheme 2 is increased more than that of Scheme 1, the maximum throughput of Scheme 2 is lower than that of Scheme 1.
- the UE switches between single TRP and SFN based on upper layer signaling (RRC information element/MAC CE).
- the UE may switch scheme 1/scheme 2/NW pre-compensation scheme based on upper layer signaling (RRC information element/MAC CE).
- RRC information element/MAC CE upper layer signaling
- the TRPs (TRP #0, #2, ...) that transmit DL signals in the opposite direction of the HST are connected to the first TRS (TRS arriving from before the HST) in the same time and frequency resource (SFN). ) to send.
- the TRPs (TRP #1, #3, . . . ) that transmit DL signals in the direction of movement of the HST transmit the second TRS (TRS that arrives after the HST) in the same time and frequency resources (SFN).
- the first TRS and the second TRS may be transmitted/received using different frequency resources.
- TRS1-1 to TRS1-4 are transmitted as the first TRS, and TRS2-1 to TRS2-4 are transmitted as the second TRS.
- the first TRS is transmitted using 64 beams and 64 time resources
- the second TRS is transmitted using 64 beams and 64 time resources.
- the beam of the first TRS and the beam of the second TRS are considered to be equal (QCL type D RS are equal).
- RRHs #0 to #7 are arranged along the HST movement route.
- RRH #0-#3 and RRH #4-#7 are connected to baseband units (BBU) #0 and #1, respectively.
- BBU baseband units
- Each RRH is a bidirectional RRH, and forms beams in both the traveling direction and the opposite direction of the moving route using each transmission/reception point (TRP).
- the signal/channel (beam in the forward direction of HST, after the UE) transmitted from TRP #2n-1 (n is an integer greater than or equal to 0) If the UE receives a beam from the UE, a negative Doppler shift (-fD in this example) occurs. In addition, when the UE receives a signal/channel (beam in the opposite direction of the HST traveling direction, beam from in front of the UE) transmitted from TRP #2n (n is an integer greater than or equal to 0), a positive Doppler shift ( In this example, +fD) occurs.
- the base station uses a Doppler pre-compensation scheme (Pre-Doppler Compensation scheme, Doppler pre-Compensation scheme, Implementation of a network (NW) pre-compensation scheme (NW pre-compensation scheme, HST NW pre-compensation scheme, TRP pre-compensation scheme, TRP-based pre-compensation scheme) is being considered.
- NW pre-compensation scheme HST NW pre-compensation scheme
- TRP pre-compensation scheme TRP-based pre-compensation scheme
- TRP performs Doppler compensation in advance when transmitting a DL signal/channel to the UE, thereby making it possible to reduce the influence of Doppler shift when the UE receives the DL signal/channel.
- the Doppler precompensation scheme may be a combination of Scheme 1 and Doppler shift precompensation by the base station.
- the TRP that forms a beam in the forward direction of the moving path and the TRP that forms the beam in the opposite direction to the forward direction of the moving path perform Doppler correction and then Transmits DL signals/channels.
- TRP#2n-1 performs positive Doppler correction
- TRP#2n performs negative Doppler correction to reduce the effect of Doppler shift on the reception of the UE's signal/channel (Fig. 4C).
- TCI field TCI status field
- each TCI code point TCI code point (TCI field code point, DCI code point) using RRC information element/MAC CE (e.g. Enhanced TCI States Activation/Deactivation for UE-specific PDSCH MAC CE)/DCI (TCI field)
- RRC information element/MAC CE e.g. Enhanced TCI States Activation/Deactivation for UE-specific PDSCH MAC CE
- TCI field TCI field
- a UE may decide to receive a single TRP PDSCH when it is configured/indicated to have one TCI state. Further, when the UE is configured/instructed to set two TCI states, the UE may determine to receive an SFN PDSCH using multi-TRP.
- one MAC CE can update the beam index (TCI state) of multiple CCs.
- the UE can be configured with up to two applicable CC lists (eg, applicable-CC-list) by RRC.
- the two applicable CC lists may correspond to the in-band CA in FR1 and the in-band CA in FR2, respectively.
- the MAC CE activates the TCI state associated with the same CORESET ID on all BWP/CCs in the applicable CC list.
- TCI state of PDSCH MAC CE activates TCI state on all BWP/CCs in the applicable CC list.
- the MAC CE activates the spatial relationships associated with the same SRS resource ID on all BWPs/CCs in the applicable CC list.
- the UE is configured with an applicable CC list indicating CC #0, #1, #2, #3 and a list indicating 64 TCI states for each CC's CORESET or PDSCH. .
- the corresponding TCI state is activated in CC #1, #2, and #3.
- the UE may follow procedure A below.
- Procedure A The UE sends an activation command to map up to eight TCI states to code points in the DCI field (TCI field) within one CC/DL BWP or within one set of CC/BWPs. Receive.
- TCI field DCI field
- the applicable list of CCs is determined by the CCs indicated in the activation command and the same The set applies to all DL BWPs within the indicated CC.
- CORESETPoolIndex CORESET Pool index
- ControlResourceSet CORESET information element
- the UE may follow procedure B below.
- Procedure B If the UE configures up to two lists of cells for simultaneous TCI state activation with the simultaneous TCI update list (simultaneousTCI-UpdateList-r16 and simultaneousTCI-UpdateListSecond-r16), the simultaneous TCI cell list (simultaneousTCI- CellList), the UE has index p in all configured DL BWPs of all configured cells in one list determined from the serving cell index provided by the MAC CE command. For CORESET, apply the antenna port quasi co-location (QCL) provided by the TCI state with the same activated TCI state ID value.
- QCL quasi co-location
- a concurrent TCI cell list may be provided for concurrent TCI state activation.
- the UE may based on the following procedure C.
- the spatial relationship information (spatialRelationInfo) for the SP or AP-SRS resource configured by the SRS resource information element (upper layer parameter SRS-Resource) is activated/updated by the MAC CE. If the CC's applicable list is indicated by the simultaneous spatial update list (upper layer parameter simultaneousSpatial-UpdateList-r16 or simultaneousSpatial-UpdateListSecond-r16), then the applicable list of CCs is specified by the same SRS resource in all BWPs in the indicated CC.
- the spatial relationship information is applied to the SP or AP-SRS resource with the ID. Only if the UE is not provided with different values of the CORESET pool index (CORESETPoolIndex) in the CORESET information element (ControlResourceSet) and is not provided with at least one TCI code point that is mapped to two TCI states; For one set of CC/BWP, the spatial relationship information (spatialRelationInfo) for the SP or AP-SRS resource configured by the SRS resource information element (upper layer parameter SRS-Resource) is activated/updated by the MAC CE. Ru.
- Simultaneous TCI cell list (simultaneousTCI-CellList), simultaneous TCI update list (at least one of simultaneousTCI-UpdateList1-r16 and simultaneousTCI-UpdateList2-r16) are serving cells whose TCI relationships can be updated simultaneously using MAC CE. This is a list of simultaneousTCI-UpdateList1-r16 and simultaneousTCI-UpdateList2-r16 do not include the same serving cell.
- the simultaneous spatial update list (at least one of the upper layer parameters simultaneousSpatial-UpdatedList1-r16 and simultaneousSpatial-UpdatedList2-r16) is a list of serving cells whose spatial relationships can be updated simultaneously using the MAC CE.
- simultaneousSpatial-UpdatedList1-r16 and simultaneousSpatial-UpdatedList2-r16 do not include the same serving cell.
- the simultaneous TCI update list and the simultaneous spatial update list are set by the RRC
- the CORESET pool index of the CORESET is set by the RRC
- the TCI code point mapped to the TCI state is indicated by the MAC CE.
- unified/common TCI framework According to the unified TCI framework, UL and DL channels can be controlled by a common framework.
- the unified TCI framework is Rel. Instead of specifying the TCI state or spatial relationship for each channel as in 15, it is possible to specify a common beam (common TCI state) and apply it to all channels of UL and DL. A common beam may be applied to all channels of UL, and a common beam for DL may be applied to all channels of DL.
- One common beam for both DL and UL, or a common beam for DL and a common beam for UL (two common beams in total) are considered.
- the UE may assume the same TCI state (joint TCI state, joint TCI pool, joint common TCI pool, joint TCI state set) for UL and DL.
- the UE assumes different TCI states (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) for each of UL and DL. You may.
- the default beams of UL and DL may be aligned by beam management based on MAC CE (MAC CE level beam instruction).
- the default TCI state of the PDSCH may be updated to match the default UL beam (spatial relationship).
- DCI-based beam management may dictate 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 from X active TCI states.
- the selected TCI state may be applied to both UL and DL channels/RSs.
- a TCI pool may be a plurality of TCI states set by RRC parameters, or a plurality of TCI states activated by the MAC CE (active TCI state, active TCI pool, set).
- 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 defined. For example, the number N ( ⁇ 1) of TCI states (UL TCI states) applied to UL channels/RSs, and the number M ( ⁇ 1) of TCI states (DL TCI states) applied to DL channels/RSs. may be specified. At least one of N and M may be notified/set/instructed to the UE via upper layer signaling/physical layer signaling.
- the UE is told that It may also mean that the TCI status) is notified/set/instructed.
- the UE is This may mean that UL TCI states (corresponding to TRPs) and Y DL TCI states (corresponding to Y TRPs) are notified/set/instructed.
- the UL TCI state and the DL TCI state may mean a TCI state common to UL and DL (i.e., joint TCI state), or may mean a TCI state of each of UL and DL (i.e., separate TCI state). You may.
- the UE is notified/set/instructed separately of one UL TCI state and one DL TCI state for a single TRP. (separate TCI state for a single TRP).
- the UE is notified/set/instructed of the TCI state common to multiple (two) ULs and DLs for multiple (two) TRPs. (joint TCI state for multiple TRPs).
- the UE has multiple (two) UL TCI states and multiple (two) DL TCI states for multiple (two) TRPs. It may also mean that the state is notified/set/instructed (separate TCI states for multiple TRPs).
- the UE may use the two TCI states set/instructed as the UL TCI state, and may use one TCI state of the two TCI states set/instructed as the DL TCI state.
- N and M are 1 or 2
- the values of N and M may be 3 or more, or N and M may be different.
- the case of M>1/N>1 may indicate at least one of TCI status indications for multiple TRPs and multiple TCI status indications for interband CA.
- the RRC parameters configure multiple TCI states for both DL and UL.
- the MAC CE may activate multiple TCI states among the configured multiple TCI states.
- the DCI may indicate one of multiple activated TCI states.
- the DCI may be a UL/DL DCI.
- the indicated TCI state may be applied to at least one (or all) of the UL/DL channels/RSs.
- One DCI may indicate both UL TCI and DL TCI.
- one point may be one TCI state that applies to both UL and DL, or two TCI states that apply to UL and DL, respectively.
- At least one of the multiple TCI states set 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). good.
- the multiple TCI states activated by the MAC CE may be referred to as an active TCI pool (active common TCI pool).
- RRC parameters upper layer parameters that configure multiple TCI states
- configuration information that configures multiple TCI states, or simply "configuration information.”
- being instructed to one of a plurality of TCI states using a DCI may mean receiving instruction information that instructs one of a plurality of TCI states included in the DCI. , it may be simply receiving "instruction information”.
- the RRC parameters configure multiple TCI states (joint common TCI pool) for both DL and UL.
- the MAC CE may activate multiple TCI states (active TCI pool) out of multiple configured TCI states. Separate active TCI pools for each of UL and DL may be configured/activated.
- the DL DCI or the new DCI format may select (instruct) one or more (for example, one) TCI state.
- the selected TCI state may be applied to one or more (or all) DL channels/RSs.
- the DL channel may be PDCCH/PDSCH/CSI-RS.
- the UE has Rel. 16 TCI state operations (TCI framework) may be used to determine the TCI state of each channel/RS of the DL.
- TCI framework 16 TCI state operations (TCI framework) may be used to determine the TCI state of each channel/RS of the DL.
- the UL DCI or the new DCI format may select (instruct) one or more (eg, one) TCI state.
- the selected TCI state may be applied to one or more (or all) UL channels/RSs.
- the UL channel may be PUSCH/SRS/PUCCH. In this way, different DCIs may indicate UL TCI and DL DCI separately.
- the DCI format that indicates the TCI state may be a specific DCI format.
- the specific DCI format may be DCI format 1_1/1_2 (defined in Rel. 15/16/17).
- the DCI format (DCI format 1_1/1_2) that indicates the TCI state may be a DCI format without DL assignment.
- a DCI format without DL assignment, a DCI format without scheduling PDSCH (DCI format 1_1/1_2), a DCI format without one or more specific fields (DCI format 1_1/1_2), one or more They may be interchanged with each other, such as DCI format (DCI format 1_1/1_2) in which specific fields are set to fixed values.
- the specific fields are the TCI field, the DCI format identifier field, the carrier indicator field, and the bandwidth portion (BWP) indicator field.
- BWP bandwidth portion
- TDRA Time Domain Resource Assignment
- DAI Downlink Assignment Index
- TPC Transmission Power Control
- PUCCH resource indicator field PUCCH resource indicator field
- PDSCH-to-HARQ feedback timing indicator field if present.
- the particular field may be set as a reserved field or may be ignored.
- the specific fields include the Redundancy Version (RV) field, the Modulation and Coding Scheme (MCS) field, New Data Indicator field, and Frequency Domain Resource Assignment (FDRA) field.
- RV Redundancy Version
- MCS Modulation and Coding Scheme
- FDRA Frequency Domain Resource Assignment
- the RV field may be set to all 1s.
- the MCS field may be set to all ones.
- the NDI field may be set to zero.
- Type 0 FDRA fields may be set to all zeros.
- Type 1 FDRA fields may be set to all ones.
- the FDRA field for the dynamic switch (upper layer parameter dynamicSwitch) may be set to all zeros.
- the common TCI framework may have separate TCI states for DL and UL.
- beam application time (BAT) Rel.
- BAT beam application time
- the DCI that schedules the PDSCH does not indicate the TCI state of the PDSCH.
- the scheduling DCI indicates the "indicated TCI state" of a DL/UL channel/RS that is temporally later than the DCI.
- the indicated TCI state is determined after a certain time (BAT) has passed since the transmission of HARQ-ACK (the last symbol of PUSCH/PUCCH transmitting HARQ-ACK) corresponding to (associated with) the beam indicated DCI. It is being considered that it will be applied (start of application) in the next slot.
- BAT a certain time
- the beam instruction DCI may be a DCI that indicates the TCI state.
- the beam instruction DCI may be in a DCI format with DL assignment or in a DCI format without DL assignment.
- HARQ-ACK corresponding to the beam indication DCI may mean HARQ-ACK for the PDSCH scheduled by the beam indication DCI, or may mean HARQ-ACK for the beam indication DCI.
- the above-mentioned specific time may be given by a specific parameter (for example, BeamAppTime_r17).
- the specific parameters may be configured in the UE through higher layer signaling (RRC signaling), or may be determined based on reported UE capability information.
- the length of BAT may be expressed in symbol units.
- the length of BAT may be, for example, any one of 1, 2, 4, 7, 14, 28, 42, 56, 70, 84, 98, 112, 224, and 336 (all units are symbols). .
- FIG. 7 shows Rel. 17 is a diagram illustrating an example of BAT defined in 17.
- the UE receives a beam indication DCI and is scheduled on a PDSCH by the DCI.
- the UE then sends an acknowledgment (ACK, HARQ-ACK) for the PDSCH.
- ACK acknowledgment
- HARQ-ACK acknowledgment
- the UE transmits the HARQ-ACK corresponding to the beam indication DCI after the time given by BeamAppTime_r17 has elapsed (the next slot of At this point, application of the TCI state indicated by the DCI is started.
- the UE may transmit HARQ-ACK associated with one or more PDSCHs in one transmission occasion.
- the TCI field of only one DCI is valid among the respective DCIs that schedule the multiple PDSCHs (the (used as a TCI field), and TCI fields of other DCIs are invalid (not used as a TCI field for beam pointing).
- the DCI whose TCI field is valid may be any DCI among the plurality of DCIs.
- FIG. 8 is a diagram illustrating an example of application of TCI states when receiving multiple beam instruction DCIs.
- the UE schedules DCI #1 that schedules PDSCH #1, DCI #2 that schedules PDSCH #2, DCI #3 that schedules PDSCH #3, and DCI #4 that schedules PDSCH #4.
- HARQ-ACK for PDSCH #1-#4 are transmitted in the same transmission opportunity.
- DCI #1 to #3 indicate TCI state #1
- DCI #4 indicates TCI state #2.
- the UE applies TCI state #2 indicated by DCI #4 after the BAT period has elapsed (the next slot) from the transmission of HARQ-ACK (the last symbol of PUSCH/PUCCH transmitting HARQ-ACK). Start. At this time, the UE ignores the TCI states indicated by DCI #1 to #3 (does not use them as TCI fields for beam instructions).
- FIG. 8 shows an example in which the TCI state of the temporally latest DCI among multiple DCIs is applied
- the DCIs that indicate the applied TCI state are DCI #1 to DCI #3. It may be either.
- Rel. 17 TCI state common TCI state
- Rel. The 17TCI state is considered applicable to situations with a single TRP.
- Rel The TCI state/spatial relationship defined by Rel. 15/16 (excluding TCI states related to positioning reference signals) and Rel. It is being considered that the 17TCI state is not set in the same band.
- Rel. 17TCI status is set in the same band, Rel. Rel. 15 to 17. This means that functions using the TCI state/space relationship of 15/16 (features, for example, operations using multi-TRP) cannot be set.
- the common TCI state is defined as Rel. It is considered to be applicable to at least one multi-TRP scheme specified in 16/17: - PDSCH (Rel.16) with single DCI-based NCJT. - PDSCH (Rel.16) that is subjected to multi-DCI-based NCJT. - Repeated transmission of PDSCH that is SDM/TDM/FDM based on single DCI (Rel.16). - Repeated transmission of PDCCH/PUCCH/PUSCH using multiple TRPs (Rel.17). ⁇ Operations related to multi-TRP in intercell (Rel.17). - Beam management for multi-TRP (Rel.17). ⁇ HST/SFN (Rel.17).
- the extension of the common TCI state may be used for beam pointing in inter-band carrier aggregation.
- one or more TCI states of a plurality of different bands may be designated using one MAC CE/DCI.
- the setting/instruction/application of the common TCI state has not been sufficiently studied. More specifically, in the case of using a common TCI state, application of the TCI state by the beam pointing DCI and application of the TCI state by the scheduling/triggering DCI have not been sufficiently studied. Furthermore, there has not been sufficient study on the operation associated with switching between transmission and reception using a single TRP and transmission and reception using multiple TRPs. If these considerations are not sufficient, there is a risk of deterioration in communication quality and throughput.
- the present inventors have developed a method for appropriately setting/instructing/applying TCI states even when applying TCI states to multiple types of signals/channels when transmitting/receiving signals/channels using multi-TRP. I came up with the idea.
- A/B/C and "at least one of A, B, and C” may be read interchangeably.
- cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read interchangeably.
- index, ID, indicator, and resource ID may be read interchangeably.
- sequences, lists, sets, groups, groups, clusters, subsets, etc. may be used interchangeably.
- the terms “support,” “control,” “controllable,” “operate,” and “capable of operating” may be used interchangeably.
- the upper layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- RRC, RRC signaling, RRC parameters, upper layer, upper layer parameters, RRC information element (IE), RRC message, and configuration may be read interchangeably.
- the MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), or the like.
- MAC CE MAC Control Element
- PDU MAC Protocol Data Unit
- MAC CE, update command, and activation/deactivation command may be read interchangeably.
- Broadcast information includes, for example, a master information block (MIB), a system information block (SIB), a minimum system information (Remaining Minimum System Information (RMSI), SIB1), and other system information. It may also be information (Other System Information (OSI)) or the like.
- MIB master information block
- SIB system information block
- RMSI Remaining Minimum System Information
- SIB1 SIB1
- OSI Operating System Information
- beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, unified beam, common TCI state, common beam, TCI assumption, QCL assumption, QCL parameter, space Domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoding, DL precoder, DL-RS, QCL type D RS assuming TCI state/QCL, RS assuming TCI state/QCL QCL type A RS, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, PL-RS may be interchanged.
- QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type good.
- DMRS DeModulation Reference Signal
- 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
- resources e.g. reference signal resources, SRS resources
- resource sets e.g. reference signal resource sets
- CORESET pool downlink Transmission Configuration Indication state (TCI state) (DL TCI state), uplink TCI state ( UL TCI state), unified TCI state, common TCI state, quasi-co-location (QCL), QCL assumption, etc.
- TCI state downlink Transmission Configuration Indication state
- the UE capability value set may include, for example, the maximum number of SRS ports supported.
- the panel may be associated with at least one of a group index of an SSB/CSI-RS group, a group index of group-based beam reporting, and a group index of an SSB/CSI-RS group for group-based beam reporting.
- the panel identifier (ID) and the panel may be read interchangeably. That is, TRP ID and TRP, CORESET group ID and CORESET group, etc. may be read interchangeably.
- one of two TCI states associated with one code point of TRP, transmission point, panel, DMRS port group, CORESET pool, TCI field may be read interchangeably.
- single (single) TRP, single TRP system, single TRP transmission, and single PDSCH may be read interchangeably.
- multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be interchanged.
- a single DCI, a single PDCCH, multiple TRPs based on a single DCI, and activated two TCI states on at least one TCI code point may be read interchangeably.
- no CORESET pool index (CORESETPoolIndex) value of 1 is set for any CORESET, and no code point in the TCI field is mapped to two TCI states. .
- multiple TRPs channels using multiple TRPs, channels using multiple TCI state/spatial relationships, multiple TRPs being enabled by RRC/DCI, multiple TCI states/spatial relationships being enabled by RRC/DCI, At least one of the multi-TRP based on the single DCI and the multi-TRP based on the multi-DCI may be read interchangeably.
- multiple TRPs based on multiple DCIs and a CORESET pool index (CORESETPoolIndex) value of 1 being set for a CORESET may be read interchangeably.
- multiple TRPs based on a single DCI at least one code point of a TCI field being mapped to two TCI states, may be read interchangeably.
- single DCI sDCI
- single PDCCH multi-TRP system based on single DCI
- sDCI-based MTRP activated two TCI states on at least one TCI code point
- multi-DCI multi-PDCI
- multi-PDCCH multi-PDCCH
- multi-TRP system based on multi-DCI
- mDCI-based MTRP two CORESET pool indexes
- the QCL of the present disclosure may be interchanged with QCL type D.
- TCI state A is the same QCL type D as TCI state B
- TCI state A is the same as TCI state B
- TCI state A is the same as TCI state B and QCL type D.” "There is” may be read interchangeably.
- the code points of the DCI field 'Transmission Configuration Indication', the TCI code points, the DCI code points, and the code points of the TCI field may be read interchangeably.
- single TRP and SFN may be read interchangeably.
- HST, HST scheme, high-speed movement scheme, scheme 1, scheme 2, NW pre-compensation scheme, HST scheme 1, HST scheme 2, and HST NW pre-compensation scheme may be read interchangeably.
- PDSCH/PDCCH using single TRP may be read as PDSCH/PDCCH based on single TRP, single TRP PDSCH/PDCCH.
- PDSCH/PDCCH using SFN may be read as PDSCH/PDCCH using SFN in multi-channel, PDSCH/PDCCH based on SFN, and SFN PDSCH/PDCCH.
- receiving DL signals (PDSCH/PDCCH) using SFN means transmitting the same data (PDSCH)/control information (PDCCH) to multiple It may also mean receiving from a sending/receiving point.
- Receiving a DL signal using SFN also means using the same time/frequency resources and/or the same data/control information using multiple TCI states/spatial domain filters/beams/QCLs. It may also mean receiving the information.
- HST-SFN scheme Rel. SFN scheme after Rel.17
- new SFN scheme new HST-SFN scheme
- Rel. HST-SFN Scenario 17 and later HST-SFN Scheme for HST-SFN Scenario, SFN Scheme for HST-SFN Scenario, Scheme 1, HST-SFN Scheme A/B, HST-SFN Type A/B
- Doppler The pre-compensation scheme, Scheme 1 (HST Scheme 1) and at least one of the Doppler pre-compensation scheme may be read interchangeably.
- Doppler pre-compensation scheme, base station pre-compensation scheme, TRP pre-compensation scheme, pre-Doppler compensation scheme, Doppler pre-compensation scheme, NW pre-compensation scheme, HST NW pre-compensation scheme, TRP pre-compensation scheme , TRP-based pre-compensation scheme, HST-SFN scheme A/B, and HST-SFN type A/B may be read interchangeably.
- a pre-compensation scheme, a reduction scheme, an improvement scheme, and a correction scheme may be read interchangeably.
- PDCCH/search space (SS)/CORESET with linkage, linked PDCCH/SS/CORESET, and PDCCH/SS/CORESET pair may be read interchangeably.
- PDCCH/SS/CORESET without linkage, unlinked PDCCH/SS/CORESET, and independent PDCCH/SS/CORESET may be read interchangeably.
- two linked CORESETs for PDCCH repetition two CORESETs respectively associated with two linked SS sets, may be read interchangeably.
- SFN-PDCCH repetition PDCCH repetition
- two linked PDCCHs two linked PDCCHs
- one DCI received across the two linked search spaces (SS)/CORESETs may be read interchangeably. good.
- PDCCH repetition, SFN-PDCCH repetition, PDCCH repetition for higher reliability, PDCCH for higher reliability, PDCCH for reliability, two linked PDCCHs are interchanged. Good too.
- PDCCH reception method PDCCH repetition, SFN-PDCCH repetition, HST-SFN, and HST-SFN scheme may be interchanged.
- the PDSCH reception method, single DCI-based multi-TRP, and HST-SFN scheme may be interchanged.
- single DCI-based multi-TRP repetition may be NCJT for enhanced mobile broadband (eMBB) service (low priority, priority 0), or URLLC service (high priority) for ultra-reliable and low latency communications service.
- eMBB enhanced mobile broadband
- URLLC ultra-reliable and low latency communications service.
- Priority and priority 1 may be repeated.
- a PDSCH for multiple TRPs based on a single DCI may be mutually read as a PDSCH to which TDM/FDM/SDM for multiple TRPs (defined in Rel. 16) is applied.
- a PDSCH for multiple TRPs may be mutually read as a PDSCH to which TDM/FDM/SDM for multiple TRPs based on a single DCI (defined in Rel. 16) is applied.
- the PUSCH/PUCCH/PDCCH for multiple TRPs based on a single DCI is mutually connected to the repetition transmission (repetition) of PUSCH/PUCCH/PDCCH for multiple TRPs (defined in Rel. 17 or later). It may be read differently.
- the SFN PDSCH/PDCCH is Rel.
- SFN PDSCH/PDCCH defined in 17 and later may be read interchangeably.
- UL transmission using multiple panels may refer to a UL transmission scheme using multiple panels of the UE with DCI enhancement.
- applying a TCI state to each channel/signal/resource may mean applying a TCI state to transmission and reception of each channel/signal/resource.
- the terms “small,” “less,” “short,” and “low” may be read interchangeably.
- the terms “ignore,” “drop,” “cancel,” “suspend,” and “postpone” may be used interchangeably.
- repetition, repeated transmission, and repeated reception may be interchanged.
- channel may be interchanged.
- DL channel may be interchanged.
- DL signal may be interchanged.
- DL signal/channel transmission/reception of DL signal/channel, DL reception, and DL transmission
- UL channel, UL signal, UL signal/channel, transmission/reception of UL signal/channel, UL reception, and UL transmission may be read interchangeably.
- the first TCI state may correspond to the first TRP.
- a second TCI state may correspond to the second TRP.
- the n-th TCI state may correspond to the n-th TRP.
- a first CORESET pool index value (e.g., 0), a first TRP index value (e.g., 1), and a first TCI state (first DL/UL (joint/separate) TCI states) may correspond to each other.
- a second CORESET pool index value (e.g., 1), a second TRP index value (e.g., 2), and a second TCI state (second DL/UL (joint/separate) TCI states) may correspond to each other.
- a method that targets two TRPs that is, when at least one of N and M is 2
- the number of TRPs may be three or more (plurality)
- 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 two.
- one beam instruction DCI may indicate multiple TCI states for each TRP.
- the plurality of TCI states may be, for example, a maximum of two joint TCI states, or a maximum of four separate DL/UL TCI states (two DL TCI states and two UL TCI states). good.
- one TCI state may mean one joint (DL/UL) TCI state, or may refer to at least one of one DL (separate) TCI state and one UL (separate) TCI state. It can also mean
- Multi-PDCCH may be assumed to be supported when multiple TRPs utilize ideal backhaul/non-ideal backhaul (see Figure 9B). .
- one DCI associated with one TRP may indicate the TCI state corresponding to the TRP.
- ideal backhaul may also be called DMRS port group type 1, reference signal related group type 1, antenna port group type 1, CORESET pool type 1, etc.
- Non-ideal backhaul may be referred to as DMRS port group type 2, reference signal related group type 2, antenna port group type 2, CORESET pool type 2, etc. The names are not limited to these.
- the field (TCI field) that indicates the TCI status included in the DCI may follow at least one of the following options 0-1 and 0-2.
- the TCI field defined up to 15/16 may be reused (see FIG. 10A).
- the DCI may include one TCI field.
- the number of bits in the TCI field may be a specific number (for example, 3).
- the TCI field defined up to 15/16 may be expanded (see FIG. 10B).
- the DCI may include a plurality of (for example, two) TCI fields.
- the number of bits in each TCI field may be a specific number (eg, 3).
- DL/UL (joint) TCI state may be activated for the UE using MAC CE.
- the UE may then be instructed to a first DL/UL (joint) TCI state and a second DL/UL (joint) TCI state using DCI (beam indication) (see FIG. 11A). ).
- the TCI code point indicated by the beam instruction may correspond to one or more (two) TCI states (first joint TCI state/second joint TCI state) (see FIG. 11B).
- all of the TCI code points corresponding to the active TCI state correspond to two TCI states, but at least one of the TCI code points corresponding to the active TCI state corresponds to the two TCI states.
- An association corresponding to the above may also be used. By using such an association, it is possible to dynamically switch between single TRP and multi-TRP.
- DL (separate) TCI state and UL (separate) TCI state may be activated for the UE using MAC CE.
- the UE uses the DCI (Beam Indication) to enter a first DL (Separate) TCI state and a first UL (Separate) TCI state, a second DL (Separate) TCI state and a second UL ( separate) TCI state (see FIG. 12A).
- DCI Beam Indication
- the TCI code point indicated by the beam instruction corresponds to one or more (two) TCI states (first separate (DL/UL) TCI state/second separate (DL/UL) TCI state). (See FIG. 12B).
- all TCI code points corresponding to the active TCI state correspond to two TCI states (first separate (DL/UL) TCI state/second separate (DL/UL) TCI state).
- an association may be used in which at least one of the TCI code points corresponding to an active TCI state corresponds to two TCI states. By using such an association, it is possible to dynamically switch between single TRP and multi-TRP.
- the TCI state activated by the MAC CE an example was shown in which separate TCI states are activated in the DL TCI state and the UL TCI state, but even in the case of the separate TCI state, the activated The DL TCI state and UL TCI state to be provided may include a common TCI state.
- At least one of setting of the TCI state by RRC, activation by MAC CE, and instruction by DCI may be performed for each CORESET pool index.
- a CORESET pool index of the first value e.g. 0
- the UE configuration of TCI state by RRC, activation by MAC CE
- Instructions may also be given by the DCI (see FIG. 13A).
- the indicated TCI state corresponding to the first value of the CORESET pool index may be referred to as a first TCI state.
- the TCI code point indicated by the beam instruction may correspond to one TCI state (first joint TCI state) (see FIG. 13B).
- a CORESET pool index of a second value (e.g. 1), configuration of TCI state by RRC, activation by MAC CE; Instructions may also be given by the DCI (see FIG. 14A).
- the indicated TCI state corresponding to the second value of the CORESET pool index may be referred to as a second TCI state.
- the TCI code point indicated by the beam instruction may correspond to one TCI state (second joint TCI state) (see FIG. 14B).
- the UE may determine that one TCI state is indicated. At this time, the UE may perform an operation using a single TRP.
- multi-DCI-based multi-TRP described above has been described as an example using a joint TCI state, it can also be appropriately applied to a case using a separate TCI state.
- indicated TCI state, Rel. 17 TCI state, common TCI state, and unified TCI state may be read interchangeably.
- common TCI states applied to channels/signals utilizing multi-TRP Rel. 17TCI state, Rel. 18TCI states may be read interchangeably.
- the UE may apply the indicated TCI state to a particular channel/signal.
- the specific channel/signal may be a UE-dedicated DL channel/signal.
- the UE-specific DL channel/signal may be a UE-specific PDCCH/PDSCH/CSI-RS (eg, an aperiodic (A-) CSI-RS).
- the specific channel/signal may be a specific UL channel/signal.
- a specific UL channel/signal can be a DCI-indicated PUSCH (indicated by a dynamic grant), a configured grant PUSCH, multiple (all) unique PUCCHs (resources), SRS (e.g. aperiodic (A-))SRS).
- One or more (for example, two) indicated TCI states may be indicated based on the method described in the zeroth embodiment above.
- a single TRP PDSCH may be scheduled with a specific DCI (DCI format).
- the specific DCI format may be, for example, DCI format 1_0 (or a DCI format that does not include a TCI field).
- the specific DCI format may be DCI format 1_1/1-2.
- the particular DCI format may indicate one TCI state.
- the QCL assumption for a single TRP PDSCH may be the default TCI state.
- the default TCI state may be one TCI state (in any DCI format).
- the single TRP PDSCH may be scheduled as a single layer MIMO (with single layer MIMO) PDSCH.
- the single TRP PDSCH may be the PDSCH when multiple TRPs (for example, CORESET pool index) are not configured in the UE.
- the single TRP PDSCH may be a PDSCH scheduled at least in CSS CORESET.
- a single TRP PDSCH may be a PDSCH scheduled with a CORESET of only a CSS (or a CSS other than a type 3 CSS).
- the following embodiments of the present disclosure may be applied to a multi-TRP PDSCH.
- a single TRP PDSCH may be scheduled with a specific DCI (DCI format).
- the specific DCI format may be DCI format 1_1/1-2.
- the particular DCI format may indicate two TCI states.
- the QCL assumption for PDSCH of multi-TRP may be the default TCI state.
- the default TCI state may be two TCI states (in any DCI format).
- the multi-TRP PDSCH may be scheduled as a multi-layer MIMO (with multi-layer MIMO) PDSCH.
- the multi-TRP PDSCH may be a PDSCH when the UE is configured to repeatedly transmit multi-TRP. At this time, the multi-TRP PDSCH may be scheduled as a PDSCH with repetition transmission (using TDM/FDM/SDM).
- the multi-TRP PDSCH may be a PDSCH when SFN scheme A/B is configured in the UE.
- a multi-TRP PDSCH may be a PDSCH with multiple TCI states.
- the following embodiments of the present disclosure may be applied to a single TRP PDCCH.
- the single TRP PDCCH may be a PDCCH related to a CORESET in which SFN scheme A/B is not configured.
- the PDCCH of a single TRP may be a PDCCH related to a CORESET (of two linked SSs) in which repeated transmission is not configured.
- the following embodiments of the present disclosure may be applied to a multi-TRP PDCCH.
- the multi-TRP PDCCH may be a PDCCH related to a CORESET in which SFN scheme A/B is configured.
- the single TRP PUSCH/PUCCH may be a PUSCH/PUCCH for which repeated transmission of multiple TRPs is not set.
- the multi-TRP PUSCH/PUCCH may be a PUSCH/PUCCH on which repeated transmission of the multi-TRP is configured.
- transmission and reception using a single TRP, single TRP mode, and channel/signal using a single TRP may be read interchangeably.
- transmission and reception using multi-TRP, multi-TRP mode, and channel/signal using multi-TRP may be read interchangeably.
- single/multiple TRP is set/instructed
- single/multiple TRP transmission/reception is set/instructed
- single/multiple TRP mode is set/instructed
- single/multiple TRP is used.
- Setting/instructing/scheduling/triggering a channel/signal may be read interchangeably.
- schedule, trigger, instruction, setting, and activate may be read interchangeably.
- the first embodiment describes the TCI field included in the DCI.
- the number of bits in the TCI field included in the beam indication DCI may be a specific value (for example, a fixed value).
- the specific value may be set in the UE using upper layer signaling (RRC signaling).
- RRC signaling upper layer signaling
- the UE may receive multiple DCIs that schedule multiple PDSCHs.
- one DCI may schedule one PDSCH.
- the UE may transmit HARQ-ACKs related to multiple PDSCHs in one transmission opportunity.
- transmission opportunity (of HARQ-ACK), PUSCH, PUCCH, PUSCH/PUCCH resource, and slot may be interchanged.
- the TCI field of only one DCI among the respective DCIs that schedule the multiple PDSCHs (as the TCI field for beam indication) is ) is valid, and the TCI fields of other DCIs may be invalid (as the TCI field for beam pointing).
- the DCI whose TCI field is valid may be any DCI among the plurality of DCIs.
- a DCI for example, DCI #4 in FIG. 8 above
- TCI field in which a TCI field is used (TCI field is valid)
- TCI field in which a TCI field is used (TCI field is valid)
- specific DCI a DCI in which a TCI field is used
- the TCI field included in one or more DCIs (for example, DCI #1-#3 in Figure 8 above) where the TCI field is not used (the TCI field is invalidated) is used for a different purpose/use. It's okay to be hit.
- DCIs in which the TCI field is not used (TCI field is invalidated) (for example, DCI #1-3 in FIG. 8 above) may be referred to as "other DCIs.”
- TCI field is enabled
- TCI field is used
- TCI field is used as a TCI field for beam indication
- the TCI field is invalidated
- the TCI field is not used
- the TCI field is not used as a TCI field for beam indication
- each scheduled/triggered channel/signal e.g. scheduled PDSCH/PUSCH and triggered aperiodic (A-) SRS/A-CSI-RS/PUCCH (e.g. HARQ-ACK)
- the indication of the TCI status of at least one of the following e.g. scheduled PDSCH/PUSCH and triggered aperiodic (A-) SRS/A-CSI-RS/PUCCH (e.g. HARQ-ACK)
- TCI states may be indicated to the UE by the beam indication DCI.
- the TCI state may be an “indicated TCI state”. As described above, the "indicated TCI state" may start to be applied after (the next slot of) the BAT.
- the UE may receive a DCI (scheduling/triggering DCI) that schedules/trigger each channel/signal.
- the scheduling/triggering DCI may be the same DCI as the beam indicating DCI, or may be a different DCI.
- the UE may follow at least one of the following options 1-A and 1-B for the TCI field of the DCI (scheduling/triggering DCI) that does not indicate the "indicated TCI state".
- the UE may One TCI state may be selected/determined from among the plurality of "instructed TCI states” based on the triggering DCI ("other DCI").
- the TCI field included in the scheduling/triggering DCI may indicate which of a plurality of indicated TCI states is to be applied.
- the UE shall The TCI field may be ignored.
- FIGS. 15A to 15D are diagrams showing examples of TCI status instructions related to option 1-A/1-B.
- the UE may be instructed to multiple "indicated TCI states" by the beam instruction DCI.
- the UE is instructed to TCI state #1 as the first TCI state and TCI state #2 as the second TCI state.
- the joint/(separate) DL TCI state is shown as the instructed TCI state, but the instructed TCI state may be the (separate) UL TCI state.
- FIG. 15B shows an example of the TCI field included in "specific DCI".
- the TCI field included in a particular DCI indicates the "indicated TCI state.”
- the UE determines whether (the next slot), application of the "TCI state indicated" by the TCI field is started. In other words, the UE changes/updates the state in which it applies the "indicated TCI state" as shown in FIG. 15A to the state in which it applies the "indicated TCI state” as shown in FIG. 15B. do.
- FIG. 15C is a diagram showing an example of the TCI field according to option 1-A.
- the example shown in FIG. 15C describes (the interpretation of) the TCI field included in the scheduling/triggering DCI (in particular, "other DCI").
- the UE determines the TCI state to apply to each channel/signal based on the TCI field included in the scheduling/triggering DCI of each channel/signal.
- the UE may determine, based on the TCI field, to apply any one of the "indicated TCI states" whose application has already started.
- the UE when the code point of the TCI field included in the scheduling/triggering DCI is "000", the UE is in the first TCI state (i.e., in FIG. 15A) among the instructed TCI states. It is determined that TCI state #1) is applied to the channel/signal corresponding to the DCI. Further, if the code point of the TCI field included in the scheduling/triggering DCI is "001", the UE is in the second TCI state (i.e., TCI state #2 in FIG. 15A) among the instructed TCI states. is applied to the channel/signal corresponding to the DCI.
- the UE receives a DCI that includes a TCI field indicating a code point that does not indicate any of the multiple "indicated TCI states" (for example, in the example of FIG. 15C, code points "010" to "111"). You don't have to assume/expect it to happen.
- a list of TCI states may be configured for the UE.
- the list may include multiple TCI states.
- the list of TCI states may be configured using RRC signaling.
- the TCI state may be referred to as a "TCI state to be set.”
- the UE may be configured with a list of TCI states, and one or more TCI states may be activated from the list.
- the TCI state may be activated using the MAC CE.
- the TCI state may also be referred to as a "TCI state to be set.”
- the UE may apply at least one of the "set TCI states" to each channel/signal. At this time, the UE selects one or more of the "TCI states to be set” (for example, , 2) TCI states may be applied.
- FIG. 15D is a diagram showing an example of the TCI field according to option 1-B.
- the example shown in FIG. 15D describes the TCI field included in the scheduling/triggering DCI (in particular, "other DCI").
- the UE determines the TCI state to apply to each channel/signal based on the TCI field included in the scheduling/triggering DCI of each channel/signal.
- the UE may schedule/trigger TCI state #16 among the configured TCI states using the DCI. the channel/signal to be used.
- FIG. 16 is a diagram illustrating an example of application of the TCI state according to the first embodiment.
- the DCI reception and PDSCH schedule in FIG. 16 are the same as in FIG. 8 described above.
- the UE applies PDSCH #1 to PDSCH #3 based on the TCI field included in DCI #1 to #3, respectively.
- DCI #1 to #3 are DCIs in which the TCI field included in the DCI is not used to indicate the "indicated TCI state.”
- the UE since DCI #1 to #3 indicate TCI state #1, the UE applies TCI state #1 to PDSCH #1 to PDSCH #3.
- the UE updates the TCI state indicated by DCI #4 after (the next slot), it is determined that the application will start.
- the "specific DCI” and the “other DCI” may correspond to the same HARQ-ACK (transmission opportunity (PUSCH/PUCCH/slot)).
- PUSCH/PUCCH/slot transmission opportunity
- one of the multiple DCIs is selected as the "specific DCI” and the "other DCI”. It may be determined that the DCI of
- the specific DCI may be the earliest/latest DCI in the time domain among multiple DCIs (PDCCH/CORESET/search spaces each transmitting multiple DCIs).
- the specific DCI is the lowest/highest CC (component carrier) index (or CCE (control channel element) ) index) may be used.
- the specific DCI may be determined according to a rule for selecting one DCI for determining a PUCCH resource indication (for example, a rule based on a CCE index/PRI (PUCCH resource indicator)). Furthermore, at least two of these rules may be applied in combination.
- the first embodiment even when receiving a plurality of DCIs that schedule/trigger a plurality of channels/signals, it is possible to appropriately apply a TCI state to each channel/signal, and to apply a common TCI state to each channel/signal. It may be determined to begin applying TCI conditions.
- the above-described first embodiment may be applied in at least one of the case where a single TRP is set (single TRP mode) and the case where multiple TRPs are set (multi-TRP mode).
- the problem is that a beam instruction delay occurs.
- a set including one or more common TCI states (“indicated TCI states”) may be indicated to the UE.
- One or more such sets may be indicated to the UE.
- the instruction may be performed using, for example, MAC CE/DCI.
- One or more such sets may be indicated to the UE by a beam indication DCI (for example, DCI format 1_1/1_2 with/without DL assignment).
- a beam indication DCI for example, DCI format 1_1/1_2 with/without DL assignment.
- the TCI state of the channel/signal to be scheduled/triggered good.
- the indicated TCI state may be indicated by a plurality of DCIs (that is, the beam instruction DCI and the scheduling/triggering DCI).
- a plurality of DCIs that is, the beam instruction DCI and the scheduling/triggering DCI.
- Such an instruction may be referred to as a two-stage (2-step) DCI instruction.
- FIG. 17 is a diagram illustrating an example of a TCI state instruction according to a modification of the first embodiment.
- multiple TCI states are configured/activated for the UE using RRC signaling/MAC CE.
- the UE is instructed to set multiple TCI states using MAC CE/DCI (DCI #1).
- the DCI #1 may be, for example, a beam instruction DCI.
- the UE is then instructed to two TCI states (a first joint TCI state and a second joint TCI state) using DCI #2.
- the DCI #2 may be, for example, a scheduling/triggering DCI.
- FIG. 18 is a diagram showing another example of the TCI state instruction according to the modification of the first embodiment.
- the UE receives DCI #1 as the beam indication DCI.
- the TCI state indicated by DCI #1 is set in the next slot after a predetermined period (BAT) has elapsed from the transmission of HARQ-ACK related to DCI #1 (the last symbol of PUSCH/PUCCH transmitting HARQ-ACK). ) application begins.
- BAT predetermined period
- the UE receives DCI #2, which is the scheduling DCI of PDSCH #2.
- the two-step DCI instruction is to instruct the TCI state to be applied to PDSCH #2 based on the TCI field included in each of DCI #1 and DCI #2.
- FIG. 19 is a diagram showing another example of the TCI state instruction according to the modification of the first embodiment.
- FIG. 19 shows the correspondence between the code points of the TCI field and the TCI states.
- four sets are instructed to the UE.
- the UE is instructed on the code point of the TCI field in the beam indication DCI (eg, DCI #1 in FIG. 18 described above).
- the UE is then directed to one of the four sets using a specific field (e.g., TCI field) included in the scheduling/triggering DCI (e.g., DCI #2 in FIG. 18 above).
- a specific field e.g., TCI field
- the number of bits of the TCI field may be set to 3 bits by RRC.
- the number of bits of the TCI field may be set from 0 to 3 bits by RRC.
- the two-stage DCI indication is not supported (i.e., the existing DCI indication, which may be referred to as a 1 stage (step) DCI indication)
- the 3-bit TCI field of the beam indication DCI is utilized. Therefore, one TCI state can be selected from a maximum of eight TCI states.
- the 3-bit TCI field of the beam indication DCI and the 3-bit TCI field of the scheduling/triggering DCI can be used, so that one out of a maximum of 64 TCI states can be used.
- One TCI state can be selected.
- each DCI when applying a two-stage DCI indication with the same flexibility (i.e., selecting one TCI state from a maximum of eight TCI states), each DCI This means that the number of bits in the TCI field included in the TCI field can be reduced.
- the beam instruction DCI and the scheduling/triggering DCI may be read interchangeably.
- the "indicated TCI state" may be shared between different channels/signals. If the UE does not receive a DCI (eg, a scheduling/triggering DCI) indicating one set of TCI states, the UE may decide to select a particular set.
- a DCI eg, a scheduling/triggering DCI
- the specific set may be defined in advance in the specifications.
- the particular set may be, for example, the set with the lowest (or highest) index.
- the specific set may be configured (as a default) to the UE using upper layer signaling (RRC).
- RRC upper layer signaling
- this modification may be applied only when a plurality of (TCI state) sets are instructed (set) to the UE.
- ⁇ Second embodiment> To support multi-TRP operation, a larger number of DCI bits is required compared to the case using a single TRP (see FIG. 20). As shown in FIG. 20, the DCI when using multi-TRP may include fields/information used only in multi-TRP mode.
- the scheduling DCI for example, DCI format 0_1/0_2
- there is a field for switching between single TRP and multi-TRP a field for switching SRI, and a field for switching TPMI. It is conceivable that at least one of the following fields will be required.
- Multi-TRP (mode)/single TRP (mode) may be configured for the UE.
- the size of the DCI may be determined by the multi-TRP mode.
- the size of the DCI in the single-TRP mode may be determined based on the size of the DCI in the multi-TRP mode.
- the size of the DCI in the single-TRP mode may be the same as the size of the DCI in the multi-TRP mode.
- the common TCI state may not be applied to a specific channel (for example, PUSCH repetition of multi-TRP).
- a specific channel for example, PUSCH repetition of multi-TRP.
- Rel. 15/16 may apply.
- a common TCI state and transmission/reception (scheme) of channels (PDSCH/PDCCH/PUSCH/PUCCH) using multi-TRP) may be configured for the UE.
- the UE may ignore a specific field included in the DCI (does not need to use the specific field).
- the switching may be performed by the DCI.
- the DCI field may be included in a specific DCI.
- the specific DCI may be a DCI that schedules PDSCH/PUSCH (eg, DCI format 0_0/0_1/0_2/1_0/1_1/1_2) or may be a beam direction DCI.
- the switching may be performed using the TCI field, for example.
- the UE may determine single TRP (mode)/multiple TRP (mode) based on the number of TCI states corresponding to one TCI code point.
- FIG. 21A is a diagram illustrating an example of switching between single TRP and multi-TRP according to the second embodiment.
- a correspondence relationship between a code point of a TCI field and one or more (two) TCI states as shown in FIG. 21A may be defined/set.
- the correspondence relationship may be defined in advance in the specifications, or may be set in the UE using upper layer signaling (RRC/MAC CE).
- the UE determines that it is in single TRP mode if the code point of the indicated TCI field corresponds to one TCI state (that is, in the case of code points "000” to "011"). Further, the UE determines that the UE is in the multi-TRP mode when the code points of the indicated TCI field correspond to two TCI states (that is, in the case of code points "100" to "111").
- a DCI field indicating at least one of single TRP (mode) or multi-TRP (mode), and the order of indicated TCI states may be defined.
- the DCI field may be referred to as a new DCI field.
- the UE may determine that it is in single TRP mode. Furthermore, if the code points of the indicated TCI field correspond to two different TCI states, the UE may determine that the UE is in multi-TRP mode.
- FIGS. 21B to 21D are diagrams showing other examples of switching between single TRP and multi-TRP according to the second embodiment. Correspondence between code points of the DCI field and one or more (two) TCI states as shown in FIGS. 21B to 21D may be defined/set.
- the correspondence relationship may be defined in advance in the specifications, or may be set in the UE using upper layer signaling (RRC/MAC CE).
- FIG. 21B shows the correspondence between the code points of the DCI field and instructions regarding the TCI status.
- the code point of the DCI field indicates "00", it means that the channel/signal associated with the DCI is a single TRP transmission and the first TCI state is applied. shows. Further, when the code point of the DCI field indicates "01”, it indicates that the channel/signal related to the DCI is a single TRP transmission and the second TCI state is applied.
- the code point of the DCI field indicates "10"
- the channel/signal related to the DCI is multi-TRP transmission
- the first TCI state is set in ascending order of the index of each channel/signal.
- the TCI states are applied in the order of the second TCI state.
- the code point of the DCI field indicates "11”
- the channel/signal related to the DCI is a multi-TRP transmission
- the second TCI state is set in ascending order of the index of each channel/signal. , indicates that the TCI states are applied in the order of the first TCI state.
- FIGS. 21C and 21D the correspondence between the code point of the DCI field and the instruction regarding the TCI state for a single TRP is shown.
- the example shown in FIG. 21C shows the correspondence between the code point of the DCI field and the instruction regarding the TCI state for a single TRP or multi-TRP.
- the code point of the DCI field indicates "0"
- it means that the channel/signal associated with the DCI is a single TRP transmission and the first TCI state is applied. shows.
- the code point of the DCI field indicates "1”
- it indicates that the channel/signal related to the DCI is a single TRP transmission and the second TCI state is applied.
- the code point of the DCI field indicates "0"
- it means that the channel/signal associated with the DCI is a single TRP transmission and the first TCI state is applied. shows.
- the code point of the DCI field indicates "1”
- the channel/signal related to the DCI is multi-TRP transmission, and the first TCI state is set in ascending order of the index of each channel/signal. , indicates that the TCI states are applied in the order of the second TCI state.
- first and second may be read interchangeably.
- the correspondence between the number of bits of the DCI field, the DCI code point, and the instruction regarding the TCI state is merely an example, and is not limited thereto.
- the UE may be instructed to use single TRP mode/multiple TRP mode.
- the instruction may be performed using DCI/MAC CE.
- the DCI size of the DL/UL DCI may be changed/switched/updated (see FIG. 22).
- the DL DCI may be, for example, DCI format 1_1/1_2.
- the UL DCI may be in DCI format 0_1/0_2, for example.
- the DCI size of the DL/UL DCI may be determined for the single TRP mode.
- the DCI size of the DL/UL DCI may be determined for multi-TRP mode.
- the DCI size for single TRP mode may be smaller than the DCI size for multi-TRP mode.
- the UE may assume/expect that the DCI size for single TRP mode is smaller than the DCI size for multi-TRP mode.
- this embodiment may be applied (only) when dynamic switching of the DCI size between single TRP mode and multi-TRP mode is configured for the UE.
- ⁇ Blind detection of DCI format In blind detection of DCI formats, the UE and the network (eg, base station) need to be on the same page about the size of the DCI.
- the timing for switching between single/multi-TRP mode (and switching the DCI size) may be on the same timeline as BAT.
- the timing regarding switching between single/multi-TRP mode (and switching between DCI sizes) may be a newly defined timeline (different from BAT).
- the BAT after HARQ-ACK transmission is defined to reduce the probability of error occurrence (for example, 0.1%). (below).
- a similar effect can be obtained by also specifying the timing regarding switching between single/multi-TRP mode (and switching between DCI sizes).
- the timing (first timing) of applying (starting) the mode instructed by DCI and the timing (second timing) of applying (starting) the mode instructed by MACCE may be the same.
- the first timing and the second timing may be values predefined in specifications, values set by upper layer signaling (RRC), or reported UE capabilities. An informed decision may be made.
- the timing of applying the mode instructed by the DCI and the timing of applying the mode instructed by the MAC CE may be defined separately.
- at least one of the first timing and the second timing may be a value specified in the specifications in advance, a value set by upper layer signaling (RRC), or a value reported.
- RRC upper layer signaling
- the determination may be made based on the UE capability information.
- the second timing is a specific time (e.g., after Xms (e.g., It may be the next slot after that.
- FIG. 23 is a diagram illustrating an example of switching between single/multi-TRP mode according to the second embodiment.
- the UE receives a DCI indicating multi-TRP mode while operating in single-TRP mode.
- the UE receives the PDSCH scheduled by the DCI and transmits the HARQ-ACK corresponding to the PDSCH.
- the UE After a specific time (in FIG. 23, the time given by BeamAppTime_r17) after the transmission of HARQ-ACK (the last symbol of PUSCH/PUCCH transmitting HARQ-ACK), (in the next slot), Switch to multi-TRP mode instructed by DCI.
- FIG. 24 is a diagram showing another example of switching between single/multi-TRP mode according to the second embodiment.
- the UE while operating in single TRP mode, the UE receives a MAC CE indicating multi-TRP mode on the PDSCH.
- the UE transmits HARQ-ACK corresponding to the PDSCH.
- the UE sends an instruction using the MAC CE. Switch to multi-TRP mode.
- the UE selects a /Multi-TRP mode may be switched.
- the specific DCI may be determined based on time/frequency resources of multiple DCIs.
- the specific DCI may be the earliest/latest DCI in the time domain among multiple DCIs (PDCCH/CORESET/search spaces each transmitting multiple DCIs).
- the specific DCI is the lowest/highest CC (component carrier) index (or CCE (control channel element) ) index) may be used.
- the specific DCI may be determined according to a rule for selecting one DCI for determining a PUCCH resource indication (for example, a rule based on a CCE index/PRI (PUCCH resource indicator)). Furthermore, at least two of these rules may be applied in combination.
- FIG. 25 is a diagram showing another example of switching between single/multi-TRP mode according to the second embodiment.
- the DCI reception, PDSCH scheduling/reception, and HARQ-ACK transmission in FIG. 25 are the same as in FIG. 8 described above.
- DCI#1-DCI#3 instruct single TRP mode
- DCI#4 instructs multi-TRP mode.
- the UE transmits HARQ-ACK related to DCI #1-#4 (the last PUSCH/PUCCH transmitting HARQ-ACK). After a specific time (in FIG. 25, the time given by BeamAppTime_r17) has elapsed since (the next slot), the multi-TRP mode is switched.
- the DCI selection method is not limited to this.
- the UE selects the single-TRP/multi-TRP mode. Operations may be defined for receiving a DCI of a mode indication.
- the operation/mechanism may be at least one of the following options 2-1 and 2-2.
- the UE determines the DCI size (TRP mode) based on a specific time (e.g. Y symbols) elapsed from the transmission of HARQ-ACK (last symbol of PUSCH/PUCCH transmitting HARQ-ACK) associated with the DCI containing a specific field. It may be determined/changed/updated later (in the next slot).
- a specific time e.g. Y symbols
- HARQ-ACK last symbol of PUSCH/PUCCH transmitting HARQ-ACK
- the Y may be defined in advance in the specifications, or may be set in the UE by upper layer signaling (RRC/MAC CE).
- the upper layer signaling may be a newly defined RRC parameter (after Rel. 18) or an RRC parameter related to BAT (for example, BeamAppTime_r17).
- the Y may also be reported as part of the UE capabilities.
- the unit of Y may be, for example, subframe/slot/subslot/ms (millisecond).
- the UE determines the DCI size (TRP mode) after a certain time (e.g. BAT) from the transmission of the HARQ-ACK (the last symbol of the PUSCH/PUCCH transmitting HARQ-ACK) associated with the beam-directed DCI. may be determined/changed/updated in the slot).
- a certain time e.g. BAT
- the DCI used to instruct/determine/change the DCI size may be a beam instruction DCI.
- the beam instruction DCI may be a DCI that indicates the "indicated TCI state" regardless of whether it has a DL assignment or not.
- FIG. 26 is a diagram showing another example of switching between single/multi-TRP mode according to option 2-2.
- the DCI reception, PDSCH scheduling/reception, and HARQ-ACK transmission in FIG. 26 are the same as in FIG. 25 described above.
- DCI#1-DCI#3 instruct single TRP mode
- DCI#4 instructs multi-TRP mode
- DCI #4 is a beam instruction DCI that indicates a TCI state (“instructed TCI state”).
- DCI #4 includes a new DCI field.
- the UE transmits HARQ-ACK related to DCI #1-#4 (the final PUSCH/PUCCH transmitting HARQ-ACK After a specific time (in FIG. 26, the time given by BeamAppTime_r17) has passed since the symbol), the mode is switched to the multi-TRP mode.
- the size of the DCI can be appropriately determined/controlled in the case of using a single TRP and the case of using multiple TRPs.
- Each embodiment/option/choice of the present disclosure may be supported in intra-cell/inter-cell beam pointing.
- TRP-specific (additional) Transmitted Precoding Matrix Indicator (TPMI) field/SRI field for PUSCH using multi-TRP in No. 17 may be used.
- ⁇ Supplement> At least one of the embodiments described above may apply only to UEs that have reported or support a particular UE capability.
- the particular UE capability may indicate at least one of the following: - Supporting specific processing/operation/control/information for at least one of the above embodiments. - Supporting (dynamic) beam direction of scheduled/triggered channels/signals (e.g. as described in the first embodiment). - Support (dynamic) DCI size switching between single TRP mode and multi-TRP mode. - Supporting multiple sets of TCI states (e.g. as described in the variant of the first embodiment).
- Supporting (dynamic) DCI size switching between single TRP mode and multi-TRP mode may be reported per UL DCI (independently) and per DL DCI (independently). Alternatively, the UL DCI and DL DCI may be reported together.
- Supporting (dynamic) DCI size switching between single TRP mode and multi-TRP mode may be reported (independently) for each joint TCI state or for each separate TCI state (independently).
- the joint TCI state and the separate TCI state may be reported together.
- Supporting multiple TCI state sets may be reported by the number of such sets.
- the above-mentioned specific UE capability may be a capability that is applied across all frequencies (commonly regardless of frequency), or may be a capability for each frequency (for example, cell, band, BWP). , capability for each frequency range (for example, Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or for each subcarrier spacing (SCS). It may be the ability of
- the above-mentioned specific UE capability may be a capability that is applied across all duplex schemes (commonly regardless of the duplex scheme), or may be a capability that is applied across all duplex schemes (for example, Time Division Duplex).
- the capability may be for each frequency division duplex (TDD)) or frequency division duplex (FDD)).
- the UE is configured with specific information related to the embodiment described above by upper layer signaling.
- the specific information may be information indicating that the common TCI state is enabled, any RRC parameters for a specific release (eg, Rel. 18), or the like.
- the UE does not support at least one of the specific UE capabilities or is not configured with the specific information, for example, Rel. 15/16/17 operations may be applied.
- a first downlink control information (DCI) for scheduling a signal corresponding to a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) transmission opportunity; and a second DCI for beam indication corresponding to the transmission opportunity.
- DCI downlink control information
- HARQ-ACK Hybrid Automatic Repeat reQuest ACKnowledgement
- TCI transmission setting instruction
- a control unit that determines a second TCI state to be applied after a specific period has elapsed from the last symbol of the transmission opportunity, based on a second TCI field, the first TCI state and Each of the second TCI states is a TCI state applied to both downlink (DL) signals and uplink (UL) signals, or a TCI state applied to DL signals and a TCI state applied to UL signals. The state of the terminal.
- the control unit Based on the first TCI field, the control unit selects one of the TCI states for the plurality of signals that have already started to be applied to the channel as the first TCI state.
- the terminal described in Appendix 1 which applies to [Additional note 3]
- the control unit applies one of a plurality of TCI states set using upper layer signaling to the channel as the first TCI state based on the first TCI field. , the terminal described in Supplementary Note 1 or Supplementary Note 2.
- the receiving unit further receives a third DCI that schedules a signal different from the signal after the specific period has elapsed, the third DCI including a field regarding an indication of a set of TCI states, The terminal according to any one of appendices 1 to 3, wherein the control unit further determines a third TCI state to be applied to the different signal based on the second DCI and the third DCI.
- a receiving unit that receives instruction information instructing either transmission/reception using a single transmission/reception point (TRP) or transmission/reception using multiple TRPs; and based on the instruction information, transmission/reception using the single TRP or transmission/reception using the multi-TRPs.
- TRP transmission/reception point
- the TCI state is a TCI state that is applied to both downlink (DL) signals and uplink (UL) signals, or a TCI state that is applied to DL signals and a TCI state that is applied to UL signals.
- the control unit determines at least one of the first switching and the second switching based on the number of TCI states corresponding to code points of the TCI field included in the instruction information. terminal.
- the control unit is configured based on a field indicating at least one of information indicating either transmission/reception using the single TRP or transmission/reception using the multi-TRP, and information regarding application of a TCI state, which is included in the instruction information. , the terminal according to appendix 1 or 2, which determines at least one of the first switching and the second switching.
- the terminal according to appendix 1 or 2, which determines at least one of the first switching and the second switching.
- wireless communication system The 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-described embodiments of the present disclosure or a combination thereof.
- FIG. 27 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by the Third Generation Partnership Project (3GPP). .
- LTE Long Term Evolution
- 5G NR 5th generation mobile communication system New Radio
- 3GPP Third Generation Partnership Project
- the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- MR-DC has dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), and dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)).
- RATs Radio Access Technologies
- MR-DC has dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), and dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)).
- 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 (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)).
- the NR base station (gNB) is the MN
- the LTE (E-UTRA) base station (eNB) is the SN.
- the wireless communication system 1 has dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC) where both the MN and SN are NR base stations (gNB)). )) may be supported.
- dual connectivity NR-NR Dual Connectivity (NN-DC) where both the MN and SN are NR base stations (gNB)).
- the wireless communication system 1 includes a base station 11 that forms a macro cell C1 with relatively wide coverage, and base stations 12 (12a-12c) that are located within the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1. You may prepare.
- User terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.
- the user terminal 20 may be connected to at least one of the plurality of base stations 10.
- the user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- Each CC may be included in at least one of 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 FR1 may correspond to a higher frequency band than FR2, for example.
- 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 plurality of base stations 10 may be connected by wire (for example, optical fiber, X2 interface, etc. compliant with Common Public Radio Interface (CPRI)) or wirelessly (for example, NR communication).
- wire for example, optical fiber, X2 interface, etc. compliant with Common Public Radio Interface (CPRI)
- NR communication for example, when NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is an upper station, is an Integrated Access Backhaul (IAB) donor, and base station 12, which is a relay station, is an IAB donor. May also be called a node.
- IAB Integrated Access Backhaul
- the base station 10 may be connected to the core network 30 via another base station 10 or directly.
- the core network 30 may include, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), and the like.
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal compatible with at least one of communication systems such as LTE, LTE-A, and 5G.
- an orthogonal frequency division multiplexing (OFDM)-based wireless access method may be used.
- OFDM orthogonal frequency division multiplexing
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a wireless access method may also be called a waveform.
- other wireless access methods for example, other single carrier transmission methods, other multicarrier transmission methods
- the UL and DL radio access methods may be used as the UL and DL radio access methods.
- the downlink channels include a physical downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (physical broadcast channel (PBCH)), and a downlink control channel (physical downlink control). Channel (PDCCH)) or the like may be used.
- PDSCH physical downlink shared channel
- PBCH physical broadcast channel
- PDCCH downlink control channel
- uplink channels include a physical uplink shared channel (PUSCH) shared by each user terminal 20, an uplink control channel (PUCCH), and a random access channel. (Physical Random Access Channel (PRACH)) or the like may be used.
- PUSCH physical uplink shared channel
- PUCCH uplink control channel
- PRACH Physical Random Access Channel
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by the PDSCH.
- User data, upper layer control information, etc. may be transmitted by PUSCH.
- a Master Information Block (MIB) may be transmitted via the PBCH.
- Lower layer control information may be transmitted by PDCCH.
- the lower layer control information may include, for example, downlink control information (DCI) that includes scheduling information for at least one of PDSCH and PUSCH.
- DCI downlink control information
- DCI that schedules PDSCH may be called DL assignment, DL DCI, etc.
- DCI that schedules PUSCH may be called UL grant, UL DCI, etc.
- PDSCH may be replaced with DL data
- PUSCH may be replaced with UL data.
- a control resource set (CONtrol REsource SET (CORESET)) and a search space may be used to detect the PDCCH.
- CORESET corresponds to a resource for searching DCI.
- the search space corresponds to a search area and a search method for PDCCH candidates (PDCCH candidates).
- PDCCH candidates PDCCH candidates
- One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.
- One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set. Note that “search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. in the present disclosure may be read interchangeably.
- the PUCCH allows channel state information (CSI), delivery confirmation information (for example, may be called Hybrid Automatic Repeat Request ACKnowledgement (HARQ-ACK), ACK/NACK, etc.), and scheduling request ( Uplink Control Information (UCI) including at least one of SR)) may be transmitted.
- CSI channel state information
- delivery confirmation information for example, may be called Hybrid Automatic Repeat Request ACKnowledgement (HARQ-ACK), ACK/NACK, etc.
- UCI Uplink Control Information including at least one of SR
- a random access preamble for establishing a connection with a cell may be transmitted by PRACH.
- downlinks, uplinks, etc. may be expressed without adding "link”.
- various channels may be expressed without adding "Physical” at the beginning.
- a synchronization signal (SS), a downlink reference signal (DL-RS), and the like may be transmitted.
- the DL-RS includes a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), and a demodulation reference signal (DeModulation).
- Reference Signal (DMRS)), Positioning Reference Signal (PRS), 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 SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS/PBCH block, SS Block (SSB), etc. Note that SS, SSB, etc. may also be called reference signals.
- DMRS Downlink Reference Signal
- UL-RS uplink reference signals
- SRS Sounding Reference Signal
- DMRS demodulation reference signals
- UE-specific reference signal user terminal-specific reference signal
- FIG. 28 is a diagram illustrating an example of the configuration of a base station according to an embodiment.
- the base station 10 includes a control section 110, a transmitting/receiving section 120, a transmitting/receiving antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140 may be provided.
- this example mainly shows functional blocks that are characteristic of the present embodiment, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 110 controls the entire base station 10.
- the control unit 110 can be configured from a controller, a control circuit, etc., which will be explained based on common recognition in the technical field related to the present disclosure.
- the control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), and the like.
- the control unit 110 may control transmission and reception, measurement, etc. using the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140.
- the control unit 110 may generate data, control information, a sequence, etc. to be transmitted as a signal, and may transfer the generated data to the transmitting/receiving unit 120.
- the control unit 110 may perform communication channel call processing (setting, release, etc.), status management of the base station 10, radio resource management, and the like.
- the transmitting/receiving section 120 may include a baseband section 121, a radio frequency (RF) section 122, and a measuring section 123.
- the baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212.
- the transmitter/receiver unit 120 includes a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter/receiver circuit, etc., which are explained based on common understanding in the technical field related to the present disclosure. be able to.
- the transmitting/receiving section 120 may be configured as an integrated transmitting/receiving section, or may be configured from a transmitting section and a receiving section.
- the transmitting section may include a transmitting processing section 1211 and an RF section 122.
- the reception section may include a reception processing section 1212, an RF section 122, and a measurement section 123.
- the transmitting/receiving antenna 130 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitter/receiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc.
- the transmitter/receiver 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmitting/receiving unit 120 may form at least one of a transmitting beam and a receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.
- digital beamforming e.g., precoding
- analog beamforming e.g., phase rotation
- the transmitting/receiving unit 120 (transmission processing unit 1211) performs Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control for example, HARQ retransmission control
- the transmitting/receiving unit 120 performs channel encoding (which may include error correction encoding), modulation, mapping, filter processing, and discrete Fourier transform (DFT) on the bit string to be transmitted.
- a baseband signal may be output by performing transmission processing such as processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion.
- IFFT Inverse Fast Fourier Transform
- the transmitting/receiving unit 120 may perform modulation, filter processing, amplification, etc. on the baseband signal in a radio frequency band, and may transmit the signal in the radio frequency band via the transmitting/receiving antenna 130. .
- the transmitting/receiving section 120 may perform amplification, filter processing, demodulation into a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 130.
- the transmitting/receiving unit 120 (reception processing unit 1212) performs analog-to-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. )) processing (if necessary), applying reception processing such as filter processing, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing, User data etc. may also be acquired.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- the transmitting/receiving unit 120 may perform measurements regarding the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, etc. based on the received signal.
- the measurement unit 123 measures received power (for example, Reference Signal Received Power (RSRP)), reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR) )) , signal strength (for example, Received Signal Strength Indicator (RSSI)), propagation path information (for example, CSI), etc. may be measured.
- the measurement results may be output to the control unit 110.
- the transmission path interface 140 transmits and receives signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and transmits and receives user data (user plane data) for the user terminal 20, control plane It is also possible to acquire and transmit data.
- the transmitting unit and receiving unit of the base station 10 in the present disclosure may be configured by at least one of the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission path interface 140.
- the transmitter/receiver 120 transmits first downlink control information (DCI) for scheduling a signal corresponding to a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) transmission opportunity, and second downlink control information (DCI) for beam instruction corresponding to the transmission opportunity.
- DCI downlink control information
- the DCI may be transmitted.
- the control unit 110 uses a first transmission setting instruction (TCI) field included in the first DCI to instruct a first TCI state to be applied to the signal, and a first TCI state included in the second DCI.
- TCI field of 2 may be used to indicate a second TCI state that begins to apply after a specified period of time after the last symbol of the transmission opportunity.
- Each of the first TCI state and the second TCI state is a TCI state applied to both downlink (DL) signals and uplink (UL) signals, or a TCI state applied to DL signals and a TCI state applied to both downlink (DL) signals and uplink (UL) signals. It may also be a TCI state applied to a UL signal (first embodiment).
- the transmitting/receiving unit 120 may transmit instruction information that instructs either transmission/reception using a single transmission/reception point (TRP) or transmission/reception using multiple TRPs.
- the control unit 110 uses the instruction information to perform at least one of first switching regarding transmission/reception using the single TRP and transmission/reception using the multi-TRP, and a second switching regarding the size of downlink control information (DCI). You may specify one of them.
- the transmission configuration instruction (TCI) state instructed using the instruction information is a TCI state applied to both downlink (DL) signals and uplink (UL) signals, or a TCI state applied to DL signals. and a TCI state applied to the UL signal (second embodiment).
- FIG. 29 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment.
- the user terminal 20 includes a control section 210, a transmitting/receiving section 220, and a transmitting/receiving antenna 230. Note that one or more of each of the control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided.
- this example mainly shows functional blocks that are characteristic of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 210 controls the entire user terminal 20.
- the control unit 210 can be configured from a controller, a control circuit, etc., which will be explained based on common recognition in the technical field related to the present disclosure.
- the control unit 210 may control signal generation, mapping, etc.
- the control unit 210 may control transmission and reception using the transmitting/receiving unit 220 and the transmitting/receiving antenna 230, measurement, and the like.
- the control unit 210 may generate data, control information, sequences, etc. to be transmitted as a signal, and may transfer the generated data to the transmitting/receiving unit 220.
- the transmitting/receiving section 220 may include a baseband section 221, an RF section 222, and a measuring section 223.
- the baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212.
- the transmitting/receiving unit 220 can be configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field related to the present disclosure.
- the transmitting/receiving section 220 may be configured as an integrated transmitting/receiving section, or may be configured from a transmitting section and a receiving section.
- the transmitting section may include a transmitting processing section 2211 and an RF section 222.
- the reception section may include a reception processing section 2212, an RF section 222, and a measurement section 223.
- the transmitting/receiving antenna 230 can be configured from an antenna, such as an array antenna, as described based on common recognition in the technical field related to the present disclosure.
- the transmitter/receiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc.
- the transmitter/receiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmitting/receiving unit 220 may form at least one of a transmitting beam and a receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.
- digital beamforming e.g., precoding
- analog beamforming e.g., phase rotation
- the transmission/reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (e.g. RLC retransmission control), MAC layer processing (e.g. , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- RLC layer processing e.g. RLC retransmission control
- MAC layer processing e.g. , HARQ retransmission control
- the transmitting/receiving unit 220 (transmission processing unit 2211) performs channel encoding (which may include error correction encoding), modulation, mapping, filter processing, DFT processing (as necessary), and IFFT processing on the bit string to be transmitted. , precoding, digital-to-analog conversion, etc., and output a baseband signal.
- DFT processing may be based on the settings of transform precoding.
- the transmitting/receiving unit 220 transmits the above processing in order to transmit the channel using the DFT-s-OFDM waveform.
- DFT processing may be performed as the transmission processing, or if not, DFT processing may not be performed as the transmission processing.
- the transmitting/receiving unit 220 may perform modulation, filter processing, amplification, etc. on the baseband signal in a radio frequency band, and may transmit the signal in the radio frequency band via the transmitting/receiving antenna 230. .
- the transmitting/receiving section 220 may perform amplification, filter processing, demodulation into a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 230.
- the transmission/reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, and decoding (error correction) on the acquired baseband signal. (which may include decoding), MAC layer processing, RLC layer processing, and PDCP layer processing may be applied to obtain user data and the like.
- the transmitting/receiving unit 220 may perform measurements regarding the received signal.
- the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal.
- the measurement unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like.
- the measurement results may be output to the control unit 210.
- the transmitting unit and receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting/receiving unit 220 and the transmitting/receiving antenna 230.
- the transmitter/receiver 220 transmits first downlink control information (DCI) for scheduling a signal corresponding to a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) transmission opportunity, and second downlink control information (DCI) for beam instruction corresponding to the transmission opportunity.
- the DCI may be received.
- the control unit 210 determines a first TCI state to be applied to the signal based on a first transmission setting instruction (TCI) field included in the first DCI, and determines a first TCI state to be applied to the signal. Based on the second TCI field, a second TCI state may be determined that starts to be applied after a certain period of time from the last symbol of the transmission opportunity.
- TCI transmission setting instruction
- Each of the first TCI state and the second TCI state is a TCI state applied to both downlink (DL) signals and uplink (UL) signals, or a TCI state applied to DL signals and a TCI state applied to both downlink (DL) signals and uplink (UL) signals. It may also be a TCI state applied to a UL signal (first embodiment).
- the control unit 210 selects one of the TCI states for the plurality of signals for which application has already been started as the first TCI state for the channel. (first embodiment).
- the control unit 210 Based on the first TCI field, the control unit 210 applies one of the TCI states among a plurality of TCI states set using upper layer signaling to the channel as the first TCI state. (first embodiment).
- the transmitter/receiver 220 may further receive a third DCI that schedules a signal different from the signal after the specific period has elapsed.
- the third DCI may include a field regarding an indication of a set of TCI states.
- the control unit 210 may further determine a third TCI state to be applied to the different signal based on the second DCI and the third DCI (first embodiment).
- the transmitting/receiving unit 220 may receive instruction information instructing either transmission/reception using a single transmission/reception point (TRP) or transmission/reception using multiple TRPs. Based on the instruction information, the control unit 210 performs at least one of first switching regarding transmission/reception using the single TRP and transmission/reception using the multi-TRP, and a second switching regarding the size of downlink control information (DCI). You can judge one side.
- the transmission configuration instruction (TCI) state instructed using the instruction information is a TCI state applied to both downlink (DL) signals and uplink (UL) signals, or a TCI state applied to DL signals. and a TCI state applied to the UL signal (second embodiment).
- the control unit 210 may determine at least one of the first switching and the second switching based on the number of TCI states corresponding to the code point of the TCI field included in the instruction information (second switching). embodiment).
- the control unit 210 is configured based on a field indicating at least one of information indicating either transmission/reception using the single TRP or transmission/reception using the multi-TRP, and information regarding application of the TCI state, which is included in the instruction information. , at least one of the first switching and the second switching may be determined (second embodiment).
- the control unit 210 may perform at least one of the first switching and the second switching at the timing of starting application of the TCI state instructed using the instruction information (second embodiment). ).
- each functional block may be realized using one physically or logically coupled device, or may be realized using two or more physically or logically separated devices directly or indirectly (e.g. , wired, wireless, etc.) and may be realized using a plurality of these devices.
- the functional block may be realized by combining software with the one device or the plurality of devices.
- functions include judgment, decision, judgement, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and consideration. , broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (configuration unit) that performs transmission may be called a transmitting unit, a transmitter, or the like. In either case, as described above, the implementation method is not particularly limited.
- a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 30 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment.
- the base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc. .
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured not to include some of the devices.
- processor 1001 may be implemented using one or more chips.
- Each function in the base station 10 and the user terminal 20 is performed by, for example, loading predetermined software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations and communicates via the communication device 1004. This is achieved by controlling at least one of reading and writing data in the memory 1002 and storage 1003.
- predetermined software program
- the processor 1001 operates an operating system to control the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) that includes interfaces with peripheral devices, a control device, an arithmetic unit, registers, and the like.
- CPU central processing unit
- the above-mentioned control unit 110 (210), transmitting/receiving unit 120 (220), etc. may be realized by the processor 1001.
- the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with these.
- programs program codes
- software modules software modules
- data etc.
- the control unit 110 may be realized by a control program stored in the memory 1002 and operated in the processor 1001, and other functional blocks may also be realized in the same way.
- the memory 1002 is a computer-readable recording medium, and includes at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other suitable storage media. It may be composed of one. Memory 1002 may be called a register, cache, main memory, or the like.
- the memory 1002 can store executable programs (program codes), software modules, and the like to implement a wireless communication method according to an embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM), etc.), a digital versatile disk, removable disk, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium. It may be configured by Storage 1003 may also be called an auxiliary storage device.
- a computer-readable recording medium such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM), etc.), a digital versatile disk, removable disk, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium. It may be configured by Storage 1003 may also be called an auxiliary storage device.
- the communication device 1004 is hardware (transmission/reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc., for example.
- the communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be configured to include.
- FDD frequency division duplex
- TDD time division duplex
- the transmitter/receiver 120 (220) may be physically or logically separated into a transmitter 120a (220a) and a receiver 120b (220b).
- the input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses for each device.
- the base station 10 and user terminal 20 also include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. It may be configured to include hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these hardwares.
- DSP digital signal processor
- ASIC application specific integrated circuit
- PLD programmable logic device
- FPGA field programmable gate array
- channel, symbol and signal may be interchanged.
- the signal may be a message.
- the reference signal may also be abbreviated as RS, and may be called a pilot, pilot signal, etc. depending on the applicable standard.
- a component carrier CC may 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 (eg, 1 ms) that does not depend on numerology.
- the numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel.
- Numerology includes, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, and 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 be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. Furthermore, a slot may be a time unit based on numerology.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may include multiple mini-slots. Each minislot may be made up of one or more symbols in the time domain. Furthermore, a mini-slot may also be called a sub-slot. A minislot may be made up of fewer symbols than a slot.
- PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (PUSCH) mapping type A.
- PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.
- Radio frames, subframes, slots, minislots, and symbols all represent time units when transmitting signals. Other names may be used for the radio frame, subframe, slot, minislot, and symbol. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.
- one subframe may be called a TTI
- a plurality of consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI.
- at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. It may be.
- the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.
- TTI refers to, for example, the minimum time unit for scheduling in wireless communication.
- a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis.
- radio resources frequency bandwidth, transmission power, etc. that can be used by each user terminal
- the TTI may be a transmission time unit of a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit of scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (for example, the number of symbols) to which transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.
- one slot or one minislot is called a TTI
- one or more TTIs may be the minimum time unit for scheduling.
- the number of slots (minislot number) that constitutes the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc.
- TTI TTI in 3GPP Rel. 8-12
- normal TTI long TTI
- normal subframe normal subframe
- long subframe slot
- TTI that is shorter than the normal TTI may be referred to as an abbreviated TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.
- long TTI for example, normal TTI, subframe, etc.
- short TTI for example, short TTI, etc. It may also be read as a TTI having the above TTI length.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more continuous subcarriers (subcarriers) in the frequency domain.
- the number of subcarriers included in an RB may be the same regardless of the numerology, and may be 12, for example.
- 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 have a length of one slot, one minislot, one subframe, or one TTI.
- One TTI, one subframe, etc. may each be composed of one or more resource blocks.
- one or more RBs include a physical resource block (Physical RB (PRB)), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, and an RB. They may also be called pairs.
- PRB Physical RB
- SCG sub-carrier group
- REG resource element group
- PRB pair an RB. They may also be called pairs.
- a resource block may be configured by one or more resource elements (REs).
- REs resource elements
- 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
- Bandwidth Part (also called partial bandwidth, etc.) refers to a subset of consecutive common resource blocks (RB) for a certain numerology in a certain carrier.
- the common RB may be specified by an RB index based on a common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP UL BWP
- BWP for DL DL BWP
- One or more BWPs may be configured within one carrier for a UE.
- 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 of the active BWP.
- “cell”, “carrier”, etc. in the present disclosure may be replaced with "BWP”.
- the structures of the radio frame, subframe, slot, minislot, symbol, etc. described above 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 symbols included in an RB The number of subcarriers, the number of symbols within a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.
- radio resources may be indicated by a predetermined index.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. which may be referred to throughout the above description, may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may also be represented by a combination of
- information, signals, etc. may be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layer.
- Information, signals, etc. may be input and output via multiple network nodes.
- Input/output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Information, signals, etc. that are input and output can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.
- 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 physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper 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 thereof It may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper 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 thereof It may be carried out by
- the physical layer signaling may also be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), etc.
- RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.
- MAC signaling may be notified using, for example, a MAC Control Element (CE).
- CE MAC Control Element
- notification of prescribed information is not limited to explicit notification, but may be made implicitly (for example, by not notifying the prescribed information or by providing other information) (by notification).
- the determination may be made by a value expressed by 1 bit (0 or 1), or by a boolean value expressed by true or false. , may be performed by numerical comparison (for example, comparison with a predetermined value).
- Software includes instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name. , should be broadly construed to mean an application, software application, software package, routine, subroutine, object, executable, thread of execution, procedure, function, etc.
- software, instructions, information, etc. may be sent and received via a transmission medium.
- a transmission medium such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.
- wired technology such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.
- wireless technology such as infrared, microwave, etc.
- Network may refer to devices (eg, base stations) included in the network.
- precoding "precoding weight”
- QCL quadsi-co-location
- TCI state "Transmission Configuration Indication state
- space space
- spatial relation "spatial domain filter”
- transmission power "phase rotation”
- antenna port "antenna port group”
- layer "number of layers”
- Terms such as “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, and “panel” are interchangeable.
- Base Station BS
- Wireless base station Wireless base station
- Fixed station NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission Point (TP)”, “Reception Point (RP)”, “Transmission/Reception Point (TRP)”, “Panel”
- cell “sector,” “cell group,” “carrier,” “component carrier,” and the like
- a base station is sometimes referred to by terms such as macrocell, small cell, femtocell, and picocell.
- a base station can accommodate one or more (eg, three) cells. If a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is connected to a base station subsystem (e.g., an indoor small base station (Remote Radio Communication services can also be provided by the Head (RRH)).
- a base station subsystem e.g., an indoor small base station (Remote Radio Communication services can also be provided by the Head (RRH)
- RRH Remote Radio Communication services
- the term “cell” or “sector” refers to part or all of the coverage area of a base station and/or base station subsystem that provides communication services in this coverage.
- a base station transmitting information to a terminal may be interchanged with the base station instructing the terminal to control/operate based on the information.
- MS Mobile Station
- UE User Equipment
- a mobile station is 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 a base station and a mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc.
- a transmitting device may be called a transmitting device, a receiving device, a wireless communication device, etc.
- the base station and the mobile station may be a device mounted on a moving object, the moving object itself, or the like.
- the moving body refers to a movable object, and the moving speed is arbitrary, and naturally includes cases where the moving body is stopped.
- the mobile objects include, for example, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, carts, rickshaws, and ships (ships and other watercraft). , including, but not limited to, airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, balloons, and items mounted thereon.
- the mobile object may be a mobile object that autonomously travels based on a travel command.
- the moving object may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving object (for example, a drone, a self-driving car, etc.), or a robot (manned or unmanned). ).
- a vehicle for example, a car, an airplane, etc.
- an unmanned moving object for example, a drone, a self-driving car, etc.
- a robot manned or unmanned.
- at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.
- at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- FIG. 31 is a diagram illustrating 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 (current sensor 50, (including 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 section 59, and a communication module 60. Be prepared.
- the drive unit 41 is composed of, for example, at least one of an engine, a motor, and a hybrid of an engine and a motor.
- the steering unit 42 includes at least a steering wheel (also referred to as a steering wheel), 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 includes a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input/output (IO) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49.
- the electronic control section 49 may be called an electronic control unit (ECU).
- the signals from the various sensors 50 to 58 include a current signal from the current sensor 50 that senses the current of the motor, a rotation speed signal of the front wheel 46/rear wheel 47 obtained by the rotation speed sensor 51, and a signal obtained by the air pressure sensor 52.
- air pressure signals of the front wheels 46/rear wheels 47 a vehicle speed signal acquired by the vehicle speed sensor 53, an acceleration signal acquired by the acceleration sensor 54, a depression amount signal of the accelerator pedal 43 acquired by the accelerator pedal sensor 55, and a brake pedal sensor.
- 56 a shift lever 45 operation signal obtained by the shift lever sensor 57, and an object detection sensor 58 for detecting obstacles, vehicles, pedestrians, etc. There are signals etc.
- the information service department 59 includes various devices such as car navigation systems, audio systems, speakers, displays, televisions, and radios that provide (output) various information such as driving information, traffic information, and entertainment information, and these devices. It consists of one or more ECUs that control the The information service unit 59 provides various information/services (for example, multimedia information/multimedia services) to the occupants of the vehicle 40 using information acquired from an external device via the communication module 60 or the like.
- various information/services for example, multimedia information/multimedia services
- the information service unit 59 may include an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accepts input from the outside, and an output device that performs output to the outside (for example, display, speaker, LED lamp, touch panel, etc.).
- an input device for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.
- an output device that performs output to the outside (for example, display, speaker, LED lamp, touch panel, etc.).
- the driving support system unit 64 includes millimeter wave radar, Light Detection and Ranging (LiDAR), a camera, a positioning locator (for example, Global Navigation Satellite System (GNSS), etc.), and map information (for example, High Definition (HD)). maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., inertial measurement units (IMUs), inertial navigation systems (INS), etc.), artificial intelligence ( Artificial Intelligence (AI) chips, AI processors, and other devices that provide functions to prevent accidents and reduce the driver's driving burden, as well as one or more devices that control these devices. It consists of an ECU. Further, the driving support system section 64 transmits and receives various information via the communication module 60, and realizes a driving support function or an automatic driving function.
- LiDAR Light Detection and Ranging
- GNSS Global Navigation Satellite System
- HD High Definition
- maps for example, autonomous vehicle (AV) maps, etc.
- gyro systems e.g.,
- 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 communicates via the communication port 63 with 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, which are included in the vehicle 40.
- Data (information) is transmitted and received between the axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58.
- 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 external devices. For example, various information is transmitted and received with an 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 base station 10, user terminal 20, etc. described above.
- the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 described above (it may function as at least one of the base station 10 and the user terminal 20).
- the communication module 60 receives signals from the various sensors 50 to 58 described above that are input to the electronic control unit 49, information obtained based on the signals, and input from the outside (user) obtained via the information service unit 59. At least one of the information based on the information may be transmitted to an external device via wireless communication.
- the electronic control unit 49, various sensors 50-58, information service unit 59, etc. may be called an input unit that receives 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, inter-vehicle information, etc.) transmitted from an external device, and displays it on the information service section 59 provided in the vehicle.
- the information service unit 59 is an output unit that outputs information (for example, outputs information to devices such as a display and a speaker based on the PDSCH (or data/information decoded from the PDSCH) received by the communication module 60). may be called.
- the communication module 60 also stores various information received from external devices into a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 controls the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, and left and right rear wheels provided in the vehicle 40. 47, axle 48, various sensors 50-58, etc. may be controlled.
- the base station in the present disclosure may be replaced by a user terminal.
- communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- D2D Device-to-Device
- V2X Vehicle-to-Everything
- each aspect/embodiment of the present disclosure may be applied.
- the user terminal 20 may have the functions that the base station 10 described above has.
- words such as "uplink” and “downlink” may be replaced with words corresponding to inter-terminal communication (for example, "sidelink”).
- uplink channels, downlink channels, etc. may be replaced with sidelink channels.
- the user terminal in the present disclosure may be replaced with a base station.
- the base station 10 may have the functions that the user terminal 20 described above has.
- the operations performed by the base station may be performed by its upper node in some cases.
- various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (e.g. It is clear that this can be performed by a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc. (though not limited thereto), or a combination thereof.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- Each aspect/embodiment described in this disclosure may be used alone, in combination, or may be switched and used in accordance with execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this disclosure may be changed as long as there is no contradiction. For example, the methods described in this disclosure use an example order to present elements of the various steps 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
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG x is an integer or decimal number, for example
- Future Radio Access FAA
- RAT New-Radio Access Technology
- NR New Radio
- NX New Radio Access
- FX Future Generation Radio Access
- G Global System for Mobile Communications
- CDMA2000 Ultra Mobile Broadband
- UMB Ultra Mobile Broadband
- IEEE 802 .11 Wi-Fi (registered trademark)
- IEEE 802.16 WiMAX (registered trademark)
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth (registered trademark), and other appropriate wireless communication methods.
- the present invention may be applied to systems to be used, next-generation systems expanded, modified, created, or defined based on these
- the phrase “based on” does not mean “based solely on” unless explicitly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- any reference to elements using the designations "first,” “second,” etc. does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, 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 any way.
- determining may encompass a wide variety of actions. For example, “judgment” can mean judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry ( For example, searching in a table, database, or other data structure), ascertaining, etc. may be considered to be “determining.”
- judgment (decision) includes receiving (e.g., receiving information), transmitting (e.g., sending information), input (input), output (output), access ( may be considered to be “determining”, such as accessing data in memory (eg, accessing data in memory).
- judgment is considered to mean “judging” resolving, selecting, choosing, establishing, comparing, etc. Good too.
- judgment (decision) may be considered to be “judgment (decision)” of some action.
- the "maximum transmit power" described in this disclosure may mean the maximum value of transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the It may also mean rated UE maximum transmit power).
- connection refers to any connection or coupling, direct or indirect, between two or more elements.
- the coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connection” may be replaced with "access.”
- microwave when two elements are connected, they may be connected using one or more electrical wires, cables, printed electrical connections, etc., as well as in the radio frequency domain, microwave can be considered to be “connected” or “coupled” to each other using electromagnetic energy having wavelengths in the light (both visible and invisible) range.
- a and B are different may mean “A and B are different from each other.” Note that the term may also mean that "A and B are each different from C”. Terms such as “separate” and “coupled” may also be interpreted similarly to “different.”
- the i-th (i is any integer), not only in the elementary, comparative, and superlative, but also interchangeably (for example, "the highest” can be interpreted as “the i-th highest”). may be read interchangeably).
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Abstract
Description
NRでは、送信設定指示状態(Transmission Configuration Indication state(TCI状態))に基づいて、信号及びチャネルの少なくとも一方(信号/チャネルと表現する)のUEにおける受信処理(例えば、受信、デマッピング、復調、復号の少なくとも1つ)、送信処理(例えば、送信、マッピング、プリコーディング、変調、符号化の少なくとも1つ)を制御することが検討されている。
・QCLタイプA(QCL-A):ドップラーシフト、ドップラースプレッド、平均遅延及び遅延スプレッド、
・QCLタイプB(QCL-B):ドップラーシフト及びドップラースプレッド、
・QCLタイプC(QCL-C):ドップラーシフト及び平均遅延、
・QCLタイプD(QCL-D):空間受信パラメータ。
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。
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(multi TRP(MTRP)))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、1つ又は複数のパネルを用いて、UL送信を行うことが検討されている。
[条件1]
1のCORESETプールインデックスが設定される。
[条件2]
CORESETプールインデックスの2つの異なる値(例えば、0及び1)が設定される。
[条件]
DCI内のTCIフィールドの1つのコードポイントに対する1つ又は2つのTCI状態を指示するために、「UE固有PDSCH用拡張TCI状態アクティベーション/ディアクティベーションMAC CE(Enhanced TCI States Activation/Deactivation for UE-specific PDSCH MAC CE)」が用いられる。
非single frequency network(SFN)に基づくマルチTRP PDCCHの信頼性のために、以下の検討1から3が検討されている。
[検討1]符号化/レートマッチングが1つの繰り返し(repetition)に基づき、他の繰り返しにおいて同じ符号化ビットが繰り返される。
[検討2]各繰り返しは、同じcontrol channel element(CCE)数と、同じ符号化ビットと、を有し、同じDCIペイロードに対応する。
[検討3]2つ以上のPDCCH候補が明示的に互いにリンクされる。UEが復号前にそのリンクを知る。
(与えられたサーチスペース(SS)セット内の)PDCCH候補の2つのセットがCORESETの2つのTCI状態にそれぞれ関連付けられる。ここでは、同じCORESET、同じSSセット、異なるモニタリングオケージョンにおけるPDCCH繰り返し、が用いられる。
PDCCH候補の2つのセットが2つのSSセットにそれぞれ関連付けられる。両方のSSセットはCORESETに関連付けられ、各SSセットはそのCORESETの1つのみのTCI状態に関連付けられる。ここでは、同じCORESET、2つのSSセット、が用いられる。
1つのSSセットが2つの異なるCORESETに関連付けられる。
2つのSSセットが2つのCORESETにそれぞれ関連付けられる。
Rel.15で規定されるPDCCH/CORESETについて、CORESETプールインデックス(CORESETPoolIndex)(TRP情報(TRP Info)と呼ばれてもよい)なしの1つのTCI状態が、1つのCORESETに設定される。
LTEにおいて、HST(high speed train)のトンネルにおける配置が難しい。ラージアンテナはトンネル外/内への送信を行う。例えば、ラージアンテナの送信電力は1から5W程度である。ハンドオーバのために、UEがトンネルに入る前にトンネル外に送信することが重要である。例えば、スモールアンテナの送信電力は250mW程度である。同じセルIDを有し300mの距離を有する複数のスモールアンテナ(送受信ポイント)はsingle frequency network(SFN)を形成する。SFN内の全てのスモールアンテナは、同じPRB上の同じ時間において同じ信号を送信する。端末は1つの基地局に対して送受信すると想定する。実際は複数の送受信ポイントが同一のDL信号を送信する。高速移動時には、数kmの単位の送受信ポイントが1つのセルを形成する。セルを跨ぐ場合にハンドオーバが行われる。これによって、ハンドオーバ頻度を低減することができる。
Rel.16において、1つのMAC CEが複数のCCのビームインデックス(TCI状態)を更新できる。
[手順A]
UEは、1つのCC/DL BWP内において、又はCC/BWPの1つのセット内において、DCIフィールド(TCIフィールド)のコードポイントに、8個までのTCI状態をマップするための、アクティベーションコマンドを受信する。CC/DL BWPの1つのセットに対してTCI状態IDの1つのセットがアクティベートされる場合、そこで、CCの適用可能リストが、アクティベーションコマンド内において指示されたCCによって決定され、TCI状態の同じセットが、指示されたCC内の全てのDL BWPに対して適用される。もしUEが、CORESET情報要素(ControlResourceSet)内のCORESETプールインデックス(CORESETPoolIndex)の異なる複数の値を提供されず、且つ、2つのTCI状態にマップされる少なくとも1つのTCIコードポイントを提供されない場合のみ、TCI状態IDの1つのセットは、CC/DL BWPの1つのセットに対してアクティベートされることができる。
[手順B]
もしUEが、同時TCI更新リスト(simultaneousTCI-UpdateList-r16及びsimultaneousTCI-UpdateListSecond-r16の少なくとも1つ)による同時TCI状態アクティベーションのためのセルの2つまでのリストを、同時TCIセルリスト(simultaneousTCI-CellList)によって提供される場合、UEは、MAC CEコマンドによって提供されるサービングセルインデックスから決定される1つのリスト内の全ての設定されたセルの全ての設定されたDL BWP内の、インデックスpを有するCORESETに対して、同じアクティベートされたTCI状態ID値を有するTCI状態によって提供されるアンテナポートquasi co-location(QCL)を適用する。もしUEが、CORESET情報要素(ControlResourceSet)内のCORESETプールインデックス(CORESETPoolIndex)の異なる複数の値を提供されず、且つ、2つのTCI状態にマップされる少なくとも1つのTCIコードポイントを提供されない場合のみ、同時TCI状態アクティベーション用に、同時TCIセルリストが提供されることができる。
[手順C]
CC/BWPの1つのセットに対し、SRSリソース情報要素(上位レイヤパラメータSRS-Resource)によって設定されるSP又はAP-SRSリソースのための空間関係情報(spatialRelationInfo)が、MAC CEによってアクティベート/アップデートされる場合、そこで、CCの適用可能リストが、同時空間更新リスト(上位レイヤパラメータsimultaneousSpatial-UpdateList-r16又はsimultaneousSpatial-UpdateListSecond-r16)によって指示され、指示されたCC内の全てのBWPにおいて、同じSRSリソースIDを有するSP又はAP-SRSリソースに対して、その空間関係情報が適用される。もしUEが、CORESET情報要素(ControlResourceSet)内のCORESETプールインデックス(CORESETPoolIndex)の異なる複数の値を提供されず、且つ、2つのTCI状態にマップされる少なくとも1つのTCIコードポイントを提供されない場合のみ、CC/BWPの1つのセットに対し、SRSリソース情報要素(上位レイヤパラメータSRS-Resource)によって設定されるSP又はAP-SRSリソースのための空間関係情報(spatialRelationInfo)が、MAC CEによってアクティベート/アップデートされる。
統一TCIフレームワークによれば、UL及びDLのチャネル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。
Rel.17における統一TCI状態において、ビームの適用に関する時間(beam application time(BAT))が導入されることが検討されている。
Rel.17において導入されるTCI状態(Rel.17TCI状態、共通TCI状態)は、1つのTCI状態(M=1、N=1又はM=N=1)を示すことが検討されている。言い換えれば、Rel.17TCI状態は、シングルTRPを用いる状況に適用可能であることが検討されている。
・シングルDCIベースのNCJTされるPDSCH(Rel.16)。
・マルチDCIベースのNCJTされるPDSCH(Rel.16)。
・シングルDCIベースのSDM/TDM/FDMされるPDSCHの繰り返し送信(Rel.16)。
・複数TRPを用いるPDCCH/PUCCH/PUSCHの繰り返し送信(Rel.17)。
・インターセルにおけるマルチ TRPに関する動作(Rel.17)。
・マルチTRP用のビームマネジメント(Rel.17)。
・HST/SFN(Rel.17)。
<第0の実施形態>
シングルDCIベースのマルチTRPは、マルチTRPが理想的バックホール(ideal backhaul)を利用する場合にサポートされると想定されてもよい(図9A参照)。
Rel.15/16までに規定されるTCIフィールドが再利用されてもよい(図10A参照)。図10Aに示すように、DCIに1つのTCIフィールドが含まれてもよい。当該TCIフィールドのビット数は、特定の数(例えば、3)であってもよい。
Rel.15/16までに規定されるTCIフィールドが拡張されてもよい(図10B参照)。例えば、DCIに、TCIフィールドが複数(例えば、2つ)含まれてもよい。それぞれのTCIフィールドのビット数は、特定の数(例えば、3)であってもよい。
第1の実施形態は、DCIに含まれるTCIフィールドについて説明する。
「指示されるTCI状態」がチャネル/信号に対して適用される場合であって、かつ、複数(例えば、2つ)の「指示されるTCI状態」が指示される場合、UEは、スケジューリング/トリガリングDCI(「他のDCI」)に基づいて、当該複数の「指示されるTCI状態」のうち、1つのTCI状態を選択/決定してもよい。
UEに対し、TCI状態のリストが設定されてもよい。当該リストは、複数のTCI状態を含んでもよい。上述のように、当該TCI状態のリストは、RRCシグナリングを用いて設定されてもよい。当該TCI状態は、「設定されるTCI状態」と呼ばれてもよい。
Rel.17における「指示されるTCI状態」について、スケジューリング/トリガリングDCIでは、「指示されるTCI状態」を制御できないケースが想定される。
マルチTRP動作をサポートするためには、シングルTRPを利用するケースと比較して、より大きい数のDCIビットが必要となる(図20参照)。図20に示すように、マルチTRPを利用する場合のDCIには、マルチTRPモードのみで使用されるフィールド/情報が含まれてもよい。
Rel.18以降において、シングルTRP(モード)及びマルチTRP(モード)の動的な切り替えがサポートされてもよい。
以下では、シングルTRPモード/マルチTRPモードの動的な切り替えに伴うDCIのサイズ(ペイロード)の切り替え/更新について説明する。
DCIフォーマットのブラインド検出において、UEとネットワーク(例えば、基地局)は、DCIのサイズについて共通の認識である必要がある。
UEは、DCIサイズ(TRPモード)を、特定のフィールドを含むDCIに関連するHARQ-ACKの送信(HARQ-ACKを送信するPUSCH/PUCCHの最終シンボル)から特定の時間(例えば、Yシンボル)経過後(の次のスロット)において、決定/変更/更新してもよい。
UEは、DCIサイズ(TRPモード)を、ビーム指示DCIに関連するHARQ-ACKの送信(HARQ-ACKを送信するPUSCH/PUCCHの最終シンボル)から特定の時間(例えば、BAT)経過後(の次のスロット)において、決定/変更/更新してもよい。
本開示の各実施形態/オプション/選択肢は、セル内(intra-cell)/セル間(inter-cell)のビーム指示においてサポートされてもよい。
上述の実施形態の少なくとも1つは、特定のUE能力(UE capability)を報告した又は当該特定のUE能力をサポートするUEに対してのみ適用されてもよい。
・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/情報をサポートすること。
・(例えば、第1の実施形態に記載される)スケジュール/トリガされるチャネル/信号の(動的な)ビーム指示をサポートすること。
・シングルTRPモード及びマルチTRPモード間の(動的な)DCIサイズのスイッチをサポートすること。
・(例えば、第1の実施形態の変形例に記載される)複数のTCI状態のセット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]
Hybrid Automatic Repeat reQuest ACKnowledgement(HARQ-ACK)の送信機会に対応する信号をスケジュールする第1の下りリンク制御情報(DCI)と、前記送信機会に対応するビーム指示のための第2のDCIと、を受信する受信部と、前記第1のDCIに含まれる第1の送信設定指示(TCI)フィールドに基づいて、前記信号に適用する第1のTCI状態を判断し、前記第2のDCIに含まれる第2のTCIフィールドに基づいて、前記送信機会の最終シンボルから特定の期間の経過後に適用が開始される第2のTCI状態を判断する制御部と、を有し、前記第1のTCI状態及び前記第2のTCI状態のそれぞれは、下りリンク(DL)信号及び上りリンク(UL)信号の両方に適用されるTCI状態、又は、DL信号に適用されるTCI状態及びUL信号に適用されるTCI状態である、端末。
[付記2]
前記制御部は、前記第1のTCIフィールドに基づいて、すでに適用が開始されている複数の信号向けの複数のTCI状態のうちのいずれかのTCI状態を、前記第1のTCI状態として前記チャネルに適用する、付記1に記載の端末。
[付記3]
前記制御部は、前記第1のTCIフィールドに基づいて、上位レイヤシグナリングを用いて設定される複数のTCI状態のうちのいずれかのTCI状態を、前記第1のTCI状態として前記チャネルに適用する、付記1又は付記2に記載の端末。
[付記4]
前記受信部は、さらに、前記特定の期間の経過後に、前記信号とは異なる信号をスケジュールする第3のDCIを受信し、前記第3のDCIは、TCI状態のセットの指示に関するフィールドを含み、前記制御部は、さらに、前記第2のDCI及び前記第3のDCIに基づいて、前記異なる信号に適用する第3のTCI状態を判断する、付記1から付記3のいずれかに記載の端末。
本開示の一実施形態に関して、以下の発明を付記する。
[付記1]
シングル送受信ポイント(TRP)を用いる送受信及びマルチTRPを用いる送受信のいずれかを指示する指示情報を受信する受信部と、前記指示情報に基づいて、前記シングルTRPを用いる送受信及び前記マルチTRPを用いる送受信に関する第1の切り替えと、下りリンク制御情報(DCI)のサイズに関する第2の切り替えと、の少なくとも一方を判断する制御部と、を有し、前記指示情報を用いて指示される送信設定指示(TCI)状態は、下りリンク(DL)信号及び上りリンク(UL)信号の両方に適用されるTCI状態、又は、DL信号に適用されるTCI状態及びUL信号に適用されるTCI状態である、端末。
[付記2]
前記制御部は、前記指示情報に含まれるTCIフィールドのコードポイントに対応するTCI状態の数に基づいて、前記第1の切り替え及び前記第2の切り替えの少なくとも一方を判断する、付記1に記載の端末。
[付記3]
前記制御部は、前記指示情報に含まれる、前記シングルTRPを用いる送受信及び前記マルチTRPを用いる送受信のいずれかを示す情報と、TCI状態の適用に関する情報と、の少なくとも一方を示すフィールドに基づいて、前記第1の切り替え及び前記第2の切り替えの少なくとも一方を判断する、付記1又は付記2に記載の端末。
[付記4]
前記制御部は、前記指示情報を用いて指示される前記TCI状態の適用を開始するタイミングにおいて、前記第1の切り替え及び前記第2の切り替えの少なくとも一方を行う、付記1から付記3のいずれかに記載の端末。
以下、本開示の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本開示の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図28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29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)
- Hybrid Automatic Repeat reQuest ACKnowledgement(HARQ-ACK)の送信機会に対応する信号をスケジュールする第1の下りリンク制御情報(DCI)と、前記送信機会に対応するビーム指示のための第2のDCIと、を受信する受信部と、
前記第1のDCIに含まれる第1の送信設定指示(TCI)フィールドに基づいて、前記信号に適用する第1のTCI状態を判断し、前記第2のDCIに含まれる第2のTCIフィールドに基づいて、前記送信機会の最終シンボルから特定の期間の経過後に適用が開始される第2のTCI状態を判断する制御部と、を有し、
前記第1のTCI状態及び前記第2のTCI状態のそれぞれは、下りリンク(DL)信号及び上りリンク(UL)信号の両方に適用されるTCI状態、又は、DL信号に適用されるTCI状態及びUL信号に適用されるTCI状態である、端末。 - 前記制御部は、前記第1のTCIフィールドに基づいて、すでに適用が開始されている複数の信号向けの複数のTCI状態のうちのいずれかのTCI状態を、前記第1のTCI状態として前記チャネルに適用する、請求項1に記載の端末。
- 前記制御部は、前記第1のTCIフィールドに基づいて、上位レイヤシグナリングを用いて設定される複数のTCI状態のうちのいずれかのTCI状態を、前記第1のTCI状態として前記チャネルに適用する、請求項1に記載の端末。
- 前記受信部は、さらに、前記特定の期間の経過後に、前記信号とは異なる信号をスケジュールする第3のDCIを受信し、前記第3のDCIは、TCI状態のセットの指示に関するフィールドを含み、
前記制御部は、さらに、前記第2のDCI及び前記第3のDCIに基づいて、前記異なる信号に適用する第3のTCI状態を判断する、請求項1に記載の端末。 - Hybrid Automatic Repeat reQuest ACKnowledgement(HARQ-ACK)の送信機会に対応する信号をスケジュールする第1の下りリンク制御情報(DCI)と、前記送信機会に対応するビーム指示のための第2のDCIと、を受信するステップと、
前記第1のDCIに含まれる第1の送信設定指示(TCI)フィールドに基づいて、前記信号に適用する第1のTCI状態を判断し、前記第2のDCIに含まれる第2のTCIフィールドに基づいて、前記送信機会の最終シンボルから特定の期間の経過後に適用が開始される第2のTCI状態を判断するステップと、を有し、
前記第1のTCI状態及び前記第2のTCI状態のそれぞれは、下りリンク(DL)信号及び上りリンク(UL)信号の両方に適用されるTCI状態、又は、DL信号に適用されるTCI状態及びUL信号に適用されるTCI状態である、端末の無線通信方法。 - Hybrid Automatic Repeat reQuest ACKnowledgement(HARQ-ACK)の送信機会に対応する信号をスケジュールする第1の下りリンク制御情報(DCI)と、前記送信機会に対応するビーム指示のための第2のDCIと、を送信する送信部と、
前記第1のDCIに含まれる第1の送信設定指示(TCI)フィールドを用いて、前記信号に適用する第1のTCI状態を指示し、前記第2のDCIに含まれる第2のTCIフィールドを用いて、前記送信機会の最終シンボルから特定の期間の経過後に適用が開始される第2のTCI状態を指示する制御部と、を有し、
前記第1のTCI状態及び前記第2のTCI状態のそれぞれは、下りリンク(DL)信号及び上りリンク(UL)信号の両方に適用されるTCI状態、又は、DL信号に適用されるTCI状態及びUL信号に適用されるTCI状態である、基地局。
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