WO2022239077A1 - 端末、無線通信方法及び基地局 - Google Patents
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
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- H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
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- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
- H04W72/232—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the physical layer, e.g. DCI signalling
Definitions
- the present disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- 3GPP Rel. 10-14 LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).
- LTE successor systems for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later
- 5G 5th generation mobile communication system
- 5G+ 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- transmission points for example, Remote Radio Head (RRH )
- RRH Remote Radio Head
- one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately receive downlink signals from multiple transmission points.
- a terminal includes a receiving unit that receives downlink control information (DCI) that schedules a physical downlink shared channel (PDSCH); based on the presence of a field indicating whether the PDSCH is either a PDSCH from a single transmission/reception point, a PDSCH utilizing a single frequency network (SFN), or a repeated transmission of the PDSCH; and a control unit for determining a TCI state used for reception.
- DCI downlink control information
- PDSCH physical downlink shared channel
- SFN single frequency network
- FIG. 1A and 1B are diagrams illustrating an example of communication between a mobile and a transmission point (eg, RRH).
- 2A-2C are diagrams illustrating an example of schemes 0-2 for SFN.
- 3A and 3B are diagrams showing an example of Scheme 1.
- FIG. 4A to 4C are diagrams showing an example of the NW pre-compensation scheme.
- 5A and 5B are diagrams illustrating examples of Doppler shifts of DL received signals.
- FIG. 6 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment.
- FIG. 7 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- FIG. 8 is a diagram illustrating an example of the configuration of a user terminal according to one embodiment.
- FIG. 9 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to one embodiment.
- the reception processing e.g., reception, demapping, demodulation, decoding
- transmission processing e.g, at least one of transmission, mapping, precoding, modulation, encoding
- the TCI state may represent those that apply to downlink signals/channels.
- the equivalent of TCI conditions applied to uplink signals/channels may be expressed as spatial relations.
- the TCI state is information about the pseudo-colocation (QCL) of signals/channels, and may be called spatial reception parameters, spatial relation information, or the like.
- the TCI state may be set in the UE on a channel-by-channel or signal-by-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, Doppler shift, Doppler spread, average delay ), delay spread, spatial parameters (e.g., spatial Rx parameter) are identical (QCL with respect to at least one of these). You may
- the spatial reception parameters may correspond to the reception beams of the UE (eg, reception analog beams), and the beams may be specified 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 may be defined for the QCL.
- QCL types AD may be provided with different parameters (or parameter sets) that can be assumed to be the same, and the parameters (which may be called QCL parameters) are shown below: QCL type A (QCL-A): Doppler shift, Doppler spread, mean delay and delay spread, QCL type B (QCL-B): Doppler shift and Doppler spread, QCL type C (QCL-C): Doppler shift and mean delay; • QCL Type D (QCL-D): Spatial reception parameters.
- CORESET Control Resource Set
- QCL QCL type D
- a UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal/channel based on the TCI conditions or QCL assumptions of that signal/channel.
- Tx beam transmit beam
- Rx beam receive beam
- the TCI state may be, for example, information about the QCL between the channel of interest (in other words, the reference signal (RS) for the channel) and another signal (for example, another RS). .
- the TCI state may be set (indicated) by higher layer signaling, physical layer signaling or a combination thereof.
- 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), Physical Uplink Shared Channel It may be at least one of a channel (PUSCH)) and an uplink control channel (Physical Uplink Control Channel (PUCCH)).
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Uplink Control Channel
- RSs that have a QCL relationship with the channel are, for example, a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a measurement reference signal (Sounding It may be at least one of a reference signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).
- SSB synchronization signal block
- CSI-RS channel state information reference signal
- Sounding It may be at least one of a reference signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).
- SRS reference signal
- TRS tracking reference signal
- QRS QCL detection reference signal
- An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- PBCH Physical Broadcast Channel
- An SSB may also be called an SS/PBCH block.
- a QCL type X RS in a TCI state may mean an RS that has a QCL type X relationship with (the DMRS of) a certain channel/signal, and this RS is called a QCL type X QCL source in that TCI state.
- the PDSCH may be scheduled on DCI with the TCI field.
- the TCI state for PDSCH is indicated by the TCI field.
- the TCI field of DCI format 1-1 is 3 bits
- the TCI field of DCI format 1-2 is 3 bits maximum.
- the UE In RRC connected mode, if for a CORESET that schedules the PDSCH, the TCI information in the first DCI (higher layer parameter tci-PresentInDCI) is set to 'enabled', the UE shall transmit in that CORESET Assume that the TCI field is present in DCI format 1_1 of the PDCCH to be transmitted.
- the UE uses DCI format 1_2 of the PDSCH transmitted in the CORESET. , there is a TCI field with the DCI field size indicated in the second DCI intra-TCI information.
- the PDSCH may be scheduled on DCI with no TCI field.
- the DCI format of the DCI is DCI format 1_0 or DCI format 1_1/1_2 in a case where TCI information in DCI (higher layer parameter tci-PresentInDCI or tci-PresentInDCI-1-2) is not set (enabled) good too.
- the UE assumes that the TCI condition or QCL assumption for PDSCH is the same as the TCI condition or QCL assumption for CORESET (eg, scheduling DCI).
- TCI information in DCI (higher layer parameters tci-PresentInDCI and tci-PresentInDCI-1-2) is set to "enabled", and when TCI information in DCI is not set
- the time offset between the reception of the DL DCI (the DCI that schedules the PDSCH) and the corresponding PDSCH (the PDSCH that is scheduled by the DCI) is smaller than the threshold (timeDurationForQCL) (application condition, first condition)
- the PDSCH TCI state (default TCI state) shall be the TCI state of the lowest CORESET ID in the most recent slot in the active DL BWP of that CC (for a particular UL signal).
- 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.
- Rel. 15 requires separate MAC CEs for activation/deactivation of PUCCH spatial relations and MAC CEs for activation/deactivation of SRS spatial relations.
- the PUSCH spatial relationship follows the SRS spatial relationship.
- At least one of MAC CE for activation/deactivation of PUCCH spatial relationship and MAC CE for activation/deactivation of SRS spatial relationship may not be used.
- both the spatial relationship and PL-RS for PUCCH are not configured (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 and PL-RS for SRS (SRS resource for SRS or SRS resource corresponding to SRI in DCI format 0_1 that schedules PUSCH) are not configured (applicable condition, second condition)
- the default assumption of spatial relationship and PL-RS (default spatial relationship and default PL-RS) is applied for PUSCH and SRS scheduled by DCI format 0_1.
- the default spatial relationship and default PL-RS are assumed to be the TCI state or QCL of the CORESET with the lowest CORESET ID in that active DL BWP. There may be. If no CORESET is set in the active DL BWP on that CC, the default spatial relationship and default PL-RS may be the active TCI state with the lowest ID of the PDSCH in that active DL BWP.
- the spatial relationship of PUSCHs 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 PUCCHs on the same CC.
- the network needs to update the PUCCH spatial relationship on all SCells even if no PUCCH is transmitted on the SCell.
- the conditions for applying the default spatial relationship/default PL-RS for SRS may include that the default beam path loss enablement information element for SRS (higher layer parameter enableDefaultBeamPlForSRS) is set to valid.
- the conditions for applying the default spatial relationship/default PL-RS for PUCCH may include that the enable default beam path loss information element for PUCCH (higher layer parameter enableDefaultBeamPlForPUCCH) is set to Enabled.
- the application condition of 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 (higher layer parameter enableDefaultBeamPlForPUSCH0_0) is set to valid.
- 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-Sched-Offset", schedule It may also be called an offset threshold, a scheduling offset threshold, or the like.
- the offset between the reception of the DL DCI and the corresponding PDSCH is less than the threshold timeDurationForQCL, and at least one TCI state configured for the serving cell of the scheduled PDSCH includes "QCL type D", and If the UE is configured with the Two Default TCI enable parameter (enableTwoDefaultTCIStates-r16), and at least one TCI codepoint indicates two TCI states, the UE indicates that the PDSCH of the serving cell or the DMRS port of the PDSCH transmission occasion has two Assume that the RS is quasi co-located with the QCL parameters associated with the two TCI states corresponding to the lowest of the TCI codepoints containing the different TCI states. 2 default TCI enablement parameter is Rel. 16 operation is enabled.
- Multi-TRP In NR, one or more transmission/reception points (Transmission/Reception Points (TRP)) (multi TRP (multi TRP (MTRP))) uses one or more panels (multi-panel) to the UE DL transmission is under consideration. It is also being considered that the UE uses one or more panels to perform UL transmissions for one or more TRPs.
- TRP Transmission/Reception Points
- MTRP multi TRP
- a plurality of 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 ideal/non-ideal backhauls to exchange information, data, and the like.
- Different codewords (CW) and different layers may be transmitted from each TRP of the multi-TRP.
- Non-Coherent Joint Transmission NCJT may be used as one form of multi-TRP transmission.
- TRP#1 modulate-maps a first codeword and layer-maps a first number of layers (e.g., two layers) with a first precoding to transmit a first PDSCH.
- TRP#2 also modulates and layer-maps a second codeword to transmit a second PDSCH with a second number of layers (eg, 2 layers) with 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 at least one of time and frequency resources.
- first PDSCH and second PDSCH are not quasi-co-located (QCL).
- Reception of multiple PDSCHs may be translated as simultaneous reception of PDSCHs that are not of a certain QCL type (eg, 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 multi-TRP may be scheduled using multiple DCIs (multi-DCI, multiple PDCCH) (multi-master mode, multi-DCI based multi-TRP (multiple PDCCH)). TRP)).
- the RVs may be the same or different for the multi-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 PDCCH configuration information (PDCCH-Config) may correspond to one TRP.
- the UE may determine multi-TRP based on multi-DCI if at least one of the following conditions 1 and 2 is met: In this case, TRP may be read as a CORESET pool index.
- TRP may be read as a 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 if the following conditions are met: In this case, two TRPs may be translated into two TCI states indicated by MAC CE/DCI. [conditions] "Enhanced TCI States Activation/Deactivation for UE- specific PDSCH MAC CE)” is used.
- DCI for common beam indication may be a UE-specific DCI format (e.g., DL DCI format (e.g., 1_1, 1_2), UL DCI format (e.g., 0_1, 0_2)), or a UE group common (UE-group common) DCI format.
- DL DCI format e.g., 1_1, 1_2
- UL DCI format e.g., 0_1, 0_2
- UE group common UE-group common
- CORESETPoolIndex (which may be called TRP Info) is set for one CORESET.
- SFN single frequency network
- RRC signaling/MAC CE higher layer signaling
- each search space set is associated with the 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 in higher layer signaling (RRC signaling/MAC CE).
- two search space sets are associated with different CORESETs with different TCI states, it may imply a repeated transmission of multi-TRP. If two search space sets are associated with the same CORESET (with the same TCI state CORESET), it may imply repeated transmission of a single TRP.
- HST High speed trains
- Large antennas transmit into/out of tunnels.
- the transmission power of a large antenna is about 1 to 5W.
- the transmission power of a small antenna is approximately 250 mW.
- Multiple small antennas transmit and receive points
- SFN single frequency network
- All small antennas within the SFN transmit the same signal at the same time on the same PRB. It is assumed that a terminal transmits and receives to one base station. In practice, multiple transmit/receive points transmit the same DL signal.
- transmission/reception points in units of several kilometers form one cell. Handover is performed when crossing cells. As a result, handover frequency can be reduced.
- NR In NR, it is transmitted from a transmission point (for example, RRH) in order to communicate with a terminal (hereinafter also referred to as UE) included in a mobile object (HST (high speed train)) such as a train that moves at high speed It is envisaged to use beams.
- HST high speed train
- Existing systems eg, Rel. 15 support the transmission of unidirectional beams from RRHs to communicate with mobile units (see FIG. 1A).
- FIG. 1A shows a case where RRHs are installed along the moving path (or moving direction, traveling direction, or running path) of the moving body, and beams are formed from each RRH in the moving direction side of the moving body.
- An RRH that forms a beam in one direction may be called a uni-directional RRH.
- the mobile receives a negative Doppler shift (-f D ) from each RRH.
- the beam is not limited to this, and the beam may be formed in the opposite direction to the moving direction. Beams may be formed in any direction regardless of .
- multiple (eg, two or more) beams 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 where RRHs are installed along the movement path of the moving object, and beams are formed from each RRH in both the traveling direction side and the opposite direction side of the traveling direction of the moving object.
- An RRH that forms beams in multiple directions may be called a bidirectional RRH (bi-directional RRH).
- UE communicates in the same way as in single TRP.
- multiple TRPs (with the same cell ID) can be transmitted.
- the mobile will have high power from a negative Doppler shifted signal halfway between the two RRHs. switch to a signal that has undergone a positive Doppler shift.
- the maximum change width of the Doppler shift that requires correction is the change from -f D to +f D , which is double that of the unidirectional RRH.
- the tracking reference signal (TRS), DMRS and PDSCH are commonly transmitted (using the same time and same frequency resources) on two TRPs (RRH) (regular SFN, transparent transparent SFN, HST-SFN).
- the PDSCH has one TCI state because the UE receives the DL channel/signal for a single TRP.
- RRC parameters are defined to distinguish between transmissions utilizing a single TRP and transmissions utilizing an SFN.
- the UE may distinguish between reception of DL channels/signals for single TRP and reception of PDSCH assuming SFN based on this RRC parameter when reporting the corresponding UE capability information.
- the UE may transmit and receive using SFN assuming a single TRP.
- TRSs are 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 abrupt changes in Doppler shift and appropriately estimate/guarantee the Doppler shift compared to scheme 0.
- the maximum throughput of scheme 2 is lower than that of scheme 1 because the DMRS of scheme 2 is increased more than the DMRS of scheme 1 .
- the UE switches between single TRP and SFN based on higher layer signaling (RRC information element/MAC CE).
- the UE may switch scheme 1/scheme 2/NW pre-compensation scheme based on higher layer signaling (RRC information element/MAC CE).
- RRC information element/MAC CE higher layer signaling
- the TRPs (TRP#0, #2, . ).
- the TRPs (TRP#1, #3, . . . ) that transmit DL signals in the traveling direction of the HST transmit the second TRS (TRS arriving after the HST) on the same time and frequency resource (SFN).
- the first TRS and the second TRS may be transmitted/received using different frequency resources.
- TRS1-1 to 1-4 are transmitted as the first TRS, and TRS2-1 to 2-4 are transmitted as the second TRS.
- 64 beams and 64 time resources are used to transmit the first TRS, and 64 beams and 64 time resources are used to transmit the second TRS.
- the beams of the first TRS and the beams of the second TRS are considered equal (equal QCL type DRS). Resource utilization efficiency can be improved by multiplexing the first TRS and the second TRS on the same time resource and different frequency resources.
- RRHs #0-#7 are arranged along the movement route of the HST.
- 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 travel direction and the reverse direction of the movement path using each transmission/reception point (TRP).
- NW pre-compensation scheme HST NW pre-compensation scheme
- HST NW pre-compensation scheme HST NW pre-compensation scheme
- the TRP that forms the beam in the traveling direction of the movement route and the TRP that forms the beam in the direction opposite to the traveling direction of the movement route performs Doppler correction for the UE in the HST. to transmit DL signals/channels.
- TRP#2n-1 provides positive Doppler correction
- TRP#2n provides negative Doppler correction to reduce the effects of Doppler shifts in the UE's signal/channel reception (Fig. 4C).
- the TCI field (TCI state field) is being considered to dynamically switch between single TRP and SFN.
- TCI state field For example, using RRC information element / MAC CE (for example, Enhanced TCI States Activation / Deactivation for UE-specific PDSCH MAC CE) / DCI (TCI field), each TCI code point (TCI field code point, DCI code point) , one or two TCI states are set/indicated.
- a UE may decide to receive a single TRP PDSCH when configured/indicated to one TCI state.
- the UE may decide to receive the SFN PDSCH with multi-TRP when configured/indicated with two TCI states.
- a PDCCH that schedules a PDSCH that utilizes an SFN may be the PDCCH described in Assumptions 1 to 3 below: Assumption 1: Rel. 15 (eg PDCCH utilizing single TRP). Assumption 2: Rel. 17 and later (eg, PDCCH using SFN). Assumption 3: Rel. 17 and later (for example, PDCCH repetition transmission (PDCCH repetition)).
- At least one of the above assumptions 1 to 3 may be specified in advance in specifications, may be set by higher layer signaling, or may be reported as UE capability information.
- a TCI field exists in the DCI in that PDCCH
- it is possible to indicate to the UE for example, a single TRP PDSCH or SFN PDSCH in that TCI field. be.
- the inventors came up with the method of indicating single TRP and SFN.
- 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, band may be read interchangeably.
- indices, IDs, indicators, and resource IDs may be read interchangeably.
- sequences, lists, sets, groups, groups, clusters, subsets, etc. may be read interchangeably.
- supporting, controlling, controllable, operating, and capable of operating may be read interchangeably.
- configure, activate, update, indicate, enable, specify, and select may be read interchangeably.
- higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- RRC, RRC signaling, RRC parameters, higher layers, higher layer parameters, RRC information elements (IEs), RRC messages, and configuration may be read interchangeably.
- MAC CE MAC Control Element
- PDU MAC Protocol Data Unit
- MAC CE update command
- activation/deactivation command may be read interchangeably.
- Broadcast information is, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), SIB1), other system It may be information (Other System Information (OSI)) or the like.
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- SIB1 other system It may be information (Other System Information (OSI)) or the like.
- beams, spatial domain filters, spatial settings, TCI states, UL TCI states, unified TCI states, unified beams, common TCI states, common beams, TCI assumptions, QCL assumptions, QCL parameters, spatial Domain Receive Filter, UE Spatial Domain Receive Filter, UE Receive Beam, DL Beam, DL Receive Beam, DL Precoding, DL Precoder, DL-RS, TCI State/QCL Assumed QCL Type D RS, TCI State/QCL Assumed 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 read interchangeably.
- QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS, SRS may be read interchangeably. good.
- the panel Uplink (UL) transmitting entity, TRP, spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, codeword, base station, antenna port of a signal (e.g., reference signal for demodulation (DeModulation Reference Signal (DMRS)) port), antenna port group for a signal (e.g. DMRS port group), group for multiplexing (e.g. Code Division Multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CORESET subset, CW, redundancy version (RV), layer (multi-input muti-output (MIMO) layer, transmission layer, spatial layer) may be read interchangeably. .
- panel identifier (ID) and panel may be read interchangeably.
- TRP ID and TRP may be read interchangeably.
- the panel may relate to at least one of the group index of the SSB/CSI-RS group, the group index of the group-based beam reporting, the group index of the SSB/CSI-RS group for the group-based beam reporting.
- the panel identifier (ID) and the panel may be read interchangeably.
- ID and the panel may be read interchangeably.
- TRP ID and TRP, CORESET group ID and CORESET group, etc. may be read interchangeably.
- TRP transmission point
- panel DMRS port group
- CORESET pool one of two TCI states associated with one codepoint of the TCI field may be read interchangeably.
- single PDCCH may be assumed to be supported when multiple TRPs utilize the ideal backhaul.
- Multi-PDCCH may be assumed to be supported when inter-multi-TRP utilizes non-ideal backhaul.
- the 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, and so on.
- Non-ideal backhaul may be referred to as DMRS port group type 2, reference signal associated group type 2, antenna port group type 2, CORESET pool type 2, and so on. Names are not limited to these.
- 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 read interchangeably.
- a single DCI, a single PDCCH, multiple TRPs based on a single DCI, and activating two TCI states on at least one TCI codepoint may be read interchangeably.
- single TRP single TRP
- channels with single TRP channels with one TCI state/spatial relationship
- multi-TRP not enabled by RRC/DCI multiple TCI states/spatial relations enabled by RRC/DCI shall not be set
- neither CORESET Pool Index (CORESETPoolIndex) value of 1 shall be set for any CORESET
- neither codepoint of the TCI field shall be mapped to two TCI states.
- multi-TRP channels with multi-TRP, channels with multiple TCI state/spatial relationships, multi-TRP enabled by RRC/DCI, multiple TCI state/spatial relationships enabled by RRC/DCI and at least one of multi-TRP based on a single DCI and multi-TRP based on multiple DCIs
- multi-TRPs based on multi-DCI setting a CORESET pool index (CORESETPoolIndex) value of 1 for a CORESET, may be read interchangeably.
- multiple TRPs based on a single DCI, where at least one codepoint of a TCI field is mapped to two TCI states may be read interchangeably.
- TRP#2 Secondary TRP
- single DCI sDCI
- single PDCCH multi-TRP system based on single DCI
- sDCI-based MTRP activating two TCI states on at least one TCI codepoint
- multi-DCI multi-PDCI
- multi-PDCCH multi-PDCCH
- multi-TRP system based on multi-DCI
- the QCL of the present disclosure may be read interchangeably 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 TCI state B
- QCL type D in the present disclosure There is” etc. may be read interchangeably.
- DMRS Downlink Reference Signal
- DMRS port Downlink Reference Signal
- antenna port may be read interchangeably.
- CSI-RS, NZP-CSI-RS, periodic (P)-CSI-RS, P-TRS, semi-persistent (SP)-CSI-RS, aperiodic (A)-CSI-RS, TRS, tracking CSI-RS for use, CSI-RS with TRS information (higher layer parameter trs-Info), NZP CSI-RS resources in the NZP CSI-RS resource set with TRS information, multiple NZP-CSI-RS on the same antenna port NZP-CSI-RS resources and TRS resources in the NZP-CSI-RS resource set consisting of resources may be read interchangeably.
- CSI-RS resource, CSI-RS resource set, CSI-RS resource group, and information element (IE) may be read interchangeably.
- the code point of the DCI field 'Transmission Configuration Indication', the TCI code point, the DCI code point, and the code point 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, HST NW pre-compensation scheme may be read interchangeably.
- PDSCH/PDCCH using single TRP may be read as PDSCH/PDCCH based on single TRP and single TRP PDSCH/PDCCH.
- PDSCH/PDCCH using SFN may be read as PDSCH/PDCCH using SFN in multi, PDSCH/PDCCH based on SFN, and SFN PDSCH/PDCCH.
- receiving DL signals (PDSCH/PDCCH) using SFN may be performed using the same time/frequency resources and/or transmitting the same data (PDSCH)/control information (PDCCH) to multiple It may mean receiving from a send/receive point.
- receiving a DL signal using an SFN may utilize multiple TCI states/spatial domain filters/beams/QCLs using the same time/frequency resources and/or the same data/control information. may mean to receive
- the NW eg, base station
- the NW may indicate single TRP PDSCH or SFN PDSCH in the TCI field.
- the UE may determine single TRP PDSCH or SFN PDSCH based at least on the TCI field.
- the NW may indicate repeated transmission of a single TRP PDSCH, SFN PDSCH, or PDSCH in the TCI field. If the PDSCH is scheduled in a DCI with a TCI field, the UE may determine a single TRP PDSCH, SFN PDSCH, or repeated transmission of the PDSCH based at least on the TCI field.
- the relevant TCI field included in the DCI format may have a specific bit length.
- the TCI field included in DCI format 1_1 may be 3 bits.
- the TCI field included in DCI format 1_2 may be up to 3 bits (ie, 0 to 3 bits).
- the bit length of the TCI field included in DCI format 1_2 may be configured based on RRC signaling.
- the first embodiment may be applied when the PDSCH is scheduled with DCI that does not have a TCI field, and/or when the scheduling offset is equal to or greater than a threshold (timeDurationForQCL).
- the DCI format of a DCI that does not have a TCI field is DCI format 1_0, or DCI in the case where TCI information in DCI (eg, higher layer parameter tci-PresentInDCI or tci-PresentInDCI-1-2) is not set (enabled). It may be in format 1_1/1_2.
- a PDSCH TCI state or QCL assumption may be the same as a particular CORESET TCI state or QCL assumption.
- the UE may assume/determine that the PDSCH TCI state or QCL assumption is the same as a particular CORESET TCI state or QCL assumption.
- the particular CORESET may be the CORESET of the DCI that schedules the PDSCH (Scheduling DCI).
- the UE may determine that the scheduled PDSCH is the single TRP PDSCH.
- the UE may determine that the scheduled PDSCH is the SFN PDSCH. At this time, one or more (for example, two) TCI states set in CORESET/search space/DCI/PDCCH may be used/applied to the SFN PDSCH.
- the SFN PDSCH may be at least one of the normal SFN PDSCH (in scheme 0), the PDSCH in scheme 1/2, and the PDSCH in the NW pre-compensation scheme. Also, the SFN PDSCH of the present disclosure may be limited to the PDSCH in scheme 1/2 or the PDSCH in the NW pre-compensation scheme.
- the upper layer assumes that the SFN PDSCH is at least one of the normal (scheme 0) SFN PDSCH, the PDSCH in scheme 1/2, and the PDSCH in the NW pre-compensation scheme May be notified/set by signaling.
- the UE notified of the TCI state may assume that the received signal is frequency-compensated in PDSCH reception.
- one TCI state is set/indicated, it may be assumed that the UE operates according to single TRP/normal SFN and receives PDSCH/DMRS without frequency compensation (FIG. 5A). (It may not be assumed to receive frequency-compensated PDSCH/DMRS).
- the UE may determine that the scheduled PDSCH is the SFN PDSCH.
- the TCI state used for one or more (for example, two) search space sets (linked search space sets) associated with one or more (for example, two) CORESETs is may be applied.
- the UE may determine that the scheduled PDSCH is repeated transmission of PDSCH.
- the TCI state used for one or more (eg, two) search space sets (linked search space sets) associated with one or more (eg, two) CORESETs is May be used/applied.
- a PDSCH TCI state or QCL assumption may correspond to one TCI state (single TRP) (may be one TCI state).
- the UE may assume/judge that the PDSCH TCI state or QCL assumption corresponds to one TCI state. At this time, the UE may assume a single TRP.
- the PDSCH corresponding to one TCI state may be at least one of a normal SFN PDSCH and a single TRP PDSCH.
- specific RRC parameters for example, RRC parameters related to High speed flag
- RRC parameters related to High speed flag may be used to configure/indicate/switch/activate normal SFN PDSCH and single TRP PDSCH.
- the UE may not assume/expect to be scheduled for the SFN PDSCH or the SFN PDSCH with repeated transmission of the PDCCH.
- the UE selects/selects one TCI state from one or more (e.g., two) TCI states corresponding to CORESET/ may decide.
- one TCI state to be selected/determined may be the TCI state corresponding to a specific CORESET ID/search space ID/TCI state ID.
- a specific CORESET ID/search space ID/TCI state ID may be the minimum (or maximum) CORESET ID/search space ID/TCI state ID.
- the specific CORESET ID/search space ID/TCI state ID may be the N-th (N is an integer) CORESET ID/search space ID/TCI state ID.
- the selected/determined one TCI state may be the first TCI state among a plurality of (for example, two) TCI states.
- the one TCI state to be selected/determined may be the TCI state corresponding to a specific TCI state ID.
- a specific TCI state ID may be the minimum (or maximum) CORESET ID/search space ID/TCI state ID.
- the specific TCI state ID may be the Nth (where N is an integer) TCI state ID.
- the selected/determined one TCI state may be the first TCI state among a plurality of (for example, two) TCI states.
- a PDSCH TCI state or QCL assumption may correspond to multiple (eg, two) TCI states (which may be multiple TCI states).
- the UE may assume/determine that a PDSCH TCI state or QCL assumption corresponds to multiple (eg, two) TCI states.
- Embodiments 1-3 may be applied, for example, to a case in which a higher layer is configured to receive PDSCHs corresponding to multiple (eg, two) TCI states in a DCI that does not have a TCI field.
- the UE may be configured with multiple (eg, two) TCI states used for PDSCH reception by higher layer configuration.
- the PDSCH when the PDSCH is scheduled with DCI that does not have a TCI field, and when the scheduling offset is equal to or greater than the threshold, even in at least one case, the PDSCH is appropriately
- the setting of reception/TCI state can be controlled.
- the second embodiment may be applied when the scheduling offset is less than the threshold (timeDurationForQCL).
- the PDSCH TCI state or QCL assumption may be the default TCI state.
- the default TCI state may be the TCI state corresponding to a particular CORESET in a particular slot.
- the specific CORESET may be the CORESET corresponding to the minimum (or maximum) CORESET ID.
- the particular slot may be the latest slot.
- a PDSCH TCI state or QCL assumption may be the same as a particular CORESET TCI state or QCL assumption.
- the UE may assume/determine that the PDSCH TCI state or QCL assumption is the same as a particular CORESET TCI state or QCL assumption.
- the particular CORESET may be the CORESET corresponding to the lowest (or highest) CORESET ID in a particular slot (eg, latest slot).
- the UE may determine that the scheduled PDSCH is the single TRP PDSCH.
- the UE may determine that the scheduled PDSCH is the SFN PDSCH. At this time, one or more (for example, two) TCI states set in CORESET/search space/DCI/PDCCH may be used/applied to the SFN PDSCH.
- the UE may determine that the scheduled PDSCH is the SFN PDSCH.
- the TCI state used for one or more (for example, two) search space sets (linked search space sets) associated with one or more (for example, two) CORESETs is may be applied.
- the UE may determine that the scheduled PDSCH is repeated transmission of PDSCH.
- the TCI state used for one or more (eg, two) search space sets (linked search space sets) associated with one or more (eg, two) CORESETs is May be used/applied.
- a PDSCH TCI state or QCL assumption may correspond to one TCI state (single TRP) (may be one TCI state).
- the UE may assume/judge that the PDSCH TCI state or QCL assumption corresponds to one TCI state. At this time, the UE may assume a single TRP.
- the UE may not assume/expect to be scheduled for the SFN PDSCH or the SFN PDSCH with repeated transmission of the PDCCH.
- the UE selects/selects one TCI state from one or more (e.g., two) TCI states corresponding to CORESET/ may decide.
- one TCI state to be selected/determined may be the TCI state corresponding to a specific CORESET ID/search space ID/TCI state ID.
- a specific CORESET ID/search space ID/TCI state ID may be the minimum (or maximum) CORESET ID/search space ID/TCI state ID.
- the specific CORESET ID/search space ID/TCI state ID may be the N-th (N is an integer) CORESET ID/search space ID/TCI state ID.
- the selected/determined one TCI state may be the first TCI state among a plurality of (for example, two) TCI states.
- the one TCI state to be selected/determined may be the TCI state corresponding to a specific TCI state ID.
- a specific TCI state ID may be the minimum (or maximum) CORESET ID/search space ID/TCI state ID.
- the specific TCI state ID may be the Nth (where N is an integer) TCI state ID.
- the selected/determined one TCI state may be the first TCI state among a plurality of (for example, two) TCI states.
- a PDSCH TCI state or QCL assumption may correspond to multiple (eg, two) TCI states (which may be multiple TCI states).
- the UE may assume/determine that a PDSCH TCI state or QCL assumption corresponds to multiple (eg, two) TCI states.
- Embodiments 1-3 may be applied, for example, to a case in which a higher layer is configured to receive PDSCHs corresponding to multiple (eg, two) TCI states in a DCI that does not have a TCI field.
- the UE may be configured with multiple (eg, two) TCI states used for PDSCH reception by higher layer configuration.
- the scheduling offset is smaller than the threshold, it is possible to appropriately control the setting of the PDSCH reception/TCI state.
- RRC IEs Higher layer parameters/UE capabilities corresponding to features in at least one of the above embodiments may be defined.
- UE capabilities may indicate support for this feature.
- a UE for which a higher layer parameter corresponding to that function (enabling that function) is set may perform that function. It may be defined that "UEs for which upper layer parameters corresponding to the function are not set shall not perform the function (for example, according to Rel. 15/16)".
- a UE reporting UE capabilities indicating that it supports that function may perform that function. It may be specified that "a UE that does not report UE capabilities indicating that it supports the feature shall not perform that feature (eg according to Rel. 15/16)".
- a UE may perform a function if it reports a UE capability indicating that it supports the function, and the higher layer parameters corresponding to the function are configured. "If the UE does not report a UE capability indicating that it supports the function, or if the upper layer parameters corresponding to the function are not set, the UE does not perform the function (e.g., according to Rel. 15/16 ) may be defined.
- the UE capability may indicate whether the UE supports this function.
- the UE capability may indicate whether or not it supports reception of the SFN PDSCH.
- the UE capability may indicate whether or not the reception of the SFN PDCCH is supported.
- the UE can implement the above functions while maintaining compatibility with existing specifications.
- wireless communication system A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below.
- communication is performed using any one of the radio communication methods according to the above embodiments of the present disclosure or a combination thereof.
- FIG. 6 is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by the Third Generation Partnership Project (3GPP). .
- LTE Long Term Evolution
- 5G NR 5th generation mobile communication system New Radio
- 3GPP Third Generation Partnership Project
- the wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- RATs Radio Access Technologies
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)), etc.
- RATs Radio Access Technologies
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)), etc.
- LTE Evolved Universal Terrestrial Radio Access
- EN-DC E-UTRA-NR Dual Connectivity
- NE-DC NR-E -UTRA Dual Connectivity
- the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN).
- the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.
- the wireless communication system 1 has dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB) )) may be supported.
- dual connectivity NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB)
- gNB NR base stations
- a wireless communication system 1 includes a base station 11 forming a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) arranged in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. You may prepare.
- a user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and user terminals 20 are not limited to the embodiment shown in the figure.
- the base stations 11 and 12 are collectively referred to as the base station 10 when not distinguished.
- the user terminal 20 may connect to at least one of the multiple base stations 10 .
- the user terminal 20 may utilize at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)).
- Macrocell C1 may be included in FR1, and small cell C2 may be included in FR2.
- FR1 may be a frequency band below 6 GHz (sub-6 GHz)
- FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.
- the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- a plurality of base stations 10 may be connected by wire (for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
- wire for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) is an IAB Also called a node.
- IAB Integrated Access Backhaul
- relay station relay station
- the base station 10 may be connected to the core network 30 directly or via another base station 10 .
- the core network 30 may include, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), and the like.
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal compatible with at least one of communication schemes such as LTE, LTE-A, and 5G.
- a radio access scheme based on orthogonal frequency division multiplexing may be used.
- OFDM orthogonal frequency division multiplexing
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a radio access method may be called a waveform.
- other radio access schemes for example, other single-carrier transmission schemes and other multi-carrier transmission schemes
- the UL and DL radio access schemes may be used as the UL and DL radio access schemes.
- a downlink shared channel Physical Downlink Shared Channel (PDSCH)
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- PDCCH Physical Downlink Control Channel
- an uplink shared channel (PUSCH) shared by each user terminal 20 an uplink control channel (PUCCH), a random access channel (Physical Random Access Channel (PRACH)) or the like may be used.
- PUSCH uplink shared channel
- PUCCH uplink control channel
- PRACH Physical Random Access Channel
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by the PDSCH.
- User data, higher layer control information, and the like may be transmitted by PUSCH.
- a Master Information Block (MIB) may be transmitted by the PBCH.
- Lower layer control information may be transmitted by the PDCCH.
- the lower layer control information may include, for example, downlink control information (DCI) including scheduling information for at least one of PDSCH and PUSCH.
- DCI downlink control information
- the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc.
- the DCI that schedules PUSCH may be called UL grant, UL DCI, etc.
- PDSCH may be replaced with DL data
- PUSCH may be replaced with UL data.
- a control resource set (CControl Resource SET (CORESET)) and a search space (search space) may be used for PDCCH detection.
- CORESET corresponds to a resource searching for DCI.
- the search space corresponds to the search area and search method of PDCCH candidates.
- a CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with certain search spaces based on the search space settings.
- One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set. Note that “search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. in the present disclosure may be read interchangeably.
- PUCCH channel state information
- acknowledgment information for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.
- SR scheduling request
- a random access preamble for connection establishment with a cell may be transmitted by the PRACH.
- downlink, uplink, etc. may be expressed without adding "link”.
- various channels may be expressed without adding "Physical" to the head.
- synchronization signals SS
- downlink reference signals DL-RS
- the DL-RS includes a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DeModulation Reference Signal (DMRS)), Positioning Reference Signal (PRS)), Phase Tracking Reference Signal (PTRS)), etc.
- CRS cell-specific reference signal
- CSI-RS channel state information reference signal
- DMRS Demodulation reference signal
- PRS Positioning Reference Signal
- PTRS Phase Tracking Reference Signal
- the synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- a signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called SS/PBCH block, SS Block (SSB), and so on.
- SS, SSB, etc. may also be referred to as reference signals.
- DMRS may also be called a user terminal-specific reference signal (UE-specific reference signal).
- FIG. 7 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- the base station 10 comprises a control section 110 , a transmission/reception section 120 , a transmission/reception antenna 130 and a transmission line interface 140 .
- One or more of each of the control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission line interface 140 may be provided.
- this example mainly shows the functional blocks that characterize the present embodiment, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 110 controls the base station 10 as a whole.
- the control unit 110 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (eg, resource allocation, mapping), and the like.
- the control unit 110 may control transmission/reception, measurement, etc. using the transmission/reception unit 120 , the transmission/reception antenna 130 and the transmission line interface 140 .
- the control unit 110 may generate data to be transmitted as a signal, control information, a sequence, etc., and transfer them to the transmission/reception unit 120 .
- the control unit 110 may perform call processing (setup, release, etc.) of communication channels, state management of the base station 10, management of radio resources, and the like.
- the transmitting/receiving section 120 may include a baseband section 121 , a radio frequency (RF) section 122 and a measuring section 123 .
- the baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212 .
- the transmitting/receiving unit 120 is configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure. be able to.
- the transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of the transmission processing section 1211 and the RF section 122 .
- the receiving section may be composed of a reception processing section 1212 , an RF section 122 and a measurement section 123 .
- the transmitting/receiving antenna 130 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 120 may receive the above-described uplink channel, uplink reference signal, and the like.
- the transmitting/receiving unit 120 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 120 (transmission processing unit 1211) performs Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control for example, HARQ retransmission control
- the transmission/reception unit 120 (transmission processing unit 1211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (DFT) on the bit string to be transmitted. Processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, transmission processing such as digital-to-analog conversion may be performed, and the baseband signal may be output.
- channel coding which may include error correction coding
- modulation modulation
- mapping mapping
- filtering filtering
- DFT discrete Fourier transform
- DFT discrete Fourier transform
- the transmitting/receiving unit 120 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 130. .
- the transmitting/receiving unit 120 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 130.
- the transmission/reception unit 120 (reception processing unit 1212) performs analog-to-digital conversion, Fast Fourier transform (FFT) processing, and Inverse Discrete Fourier transform (IDFT) processing on the acquired baseband signal. )) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing. User data and the like may be acquired.
- FFT Fast Fourier transform
- IDFT Inverse Discrete Fourier transform
- the transmitting/receiving unit 120 may measure the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, etc. based on the received signal.
- the measurement unit 123 measures received power (for example, Reference Signal Received Power (RSRP)), reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)) , signal strength (for example, Received Signal Strength Indicator (RSSI)), channel information (for example, CSI), and the like may be measured.
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- RSSI Received Signal Strength Indicator
- channel information for example, CSI
- the transmission path interface 140 transmits and receives signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, etc., and user data (user plane data) for the user terminal 20, control plane data, and the like. Data and the like may be obtained, transmitted, and the like.
- the transmitter and receiver of the base station 10 in the present disclosure may be configured by at least one of the transmitter/receiver 120, the transmitter/receiver antenna 130, and the transmission line interface 140.
- the transmitting/receiving unit 120 may transmit downlink control information (DCI) that schedules the physical downlink shared channel (PDSCH).
- DCI downlink control information
- a field may or may not be present in the DCI to indicate the transmission configuration indication (TCI) state of the PDSCH.
- the controller 110 may apply the TCI state to the PDSCH. Based on the presence of the field in the DCI, whether the PDSCH is either PDSCH from a single transmit/receive point, PDSCH utilizing a single frequency network (SFN), or repeated transmissions of PDSCH;
- the TCI state applied to PDSCH transmission may be determined by the terminal (first and second embodiments).
- FIG. 8 is a diagram illustrating an example of the configuration of a user terminal according to one embodiment.
- the user terminal 20 includes a control section 210 , a transmission/reception section 220 and a transmission/reception antenna 230 .
- One or more of each of the control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided.
- this example mainly shows the functional blocks of the features of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 210 controls the user terminal 20 as a whole.
- the control unit 210 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 210 may control signal generation, mapping, and the like.
- the control unit 210 may control transmission/reception, measurement, etc. using the transmission/reception unit 220 and the transmission/reception antenna 230 .
- the control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission/reception unit 220 .
- the transmitting/receiving section 220 may include a baseband section 221 , an RF section 222 and a measurement section 223 .
- the baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212 .
- the transmitting/receiving unit 220 can be configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure.
- the transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of a transmission processing section 2211 and an RF section 222 .
- the receiving section may include a reception processing section 2212 , an RF section 222 and a measurement section 223 .
- the transmitting/receiving antenna 230 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 220 may transmit the above-described uplink channel, uplink reference signal, and the like.
- the transmitter/receiver 220 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- RLC layer processing for example, RLC retransmission control
- MAC layer processing for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control
- the transmitting/receiving unit 220 (transmission processing unit 2211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), and IFFT processing on a bit string to be transmitted. , precoding, digital-analog conversion, and other transmission processing may be performed, and the baseband signal may be output.
- Whether or not to apply DFT processing may be based on transform precoding settings. Transmitting/receiving unit 220 (transmission processing unit 2211), for a certain channel (for example, PUSCH), if transform precoding is enabled, the above to transmit the channel using the DFT-s-OFDM waveform
- the DFT process may be performed as the transmission process, or otherwise the DFT process may not be performed as the transmission process.
- the transmitting/receiving unit 220 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 230. .
- the transmitting/receiving section 220 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 230.
- the transmission/reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (error correction) on the acquired baseband signal. decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmitting/receiving section 220 may measure the received signal.
- the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal.
- the measuring unit 223 may measure received power (eg, RSRP), received quality (eg, RSRQ, SINR, SNR), signal strength (eg, RSSI), channel information (eg, CSI), and the like.
- the measurement result may be output to control section 210 .
- the transmitter and receiver of the user terminal 20 in the present disclosure may be configured by at least one of the transmitter/receiver 220 and the transmitter/receiver antenna 230 .
- the transmitting/receiving unit 220 may receive downlink control information (DCI) that schedules the physical downlink shared channel (PDSCH). Based on the presence of a field in the DCI that indicates the transmission configuration indication (TCI) state of the PDSCH, the control unit 210 determines whether the PDSCH can transmit the PDSCH, single frequency network (SFN) from a single transmission/reception point. It may be determined whether the PDSCH to be used or repeated transmission of the PDSCH, and the TCI state to be applied to the reception of the PDSCH (first and second embodiments).
- DCI downlink control information
- TCI transmission configuration indication
- the control unit 210 may determine that the TCI state used for receiving the PDSCH is the same TCI state as the TCI state corresponding to a specific control resource set (first and second embodiments).
- the control unit 210 may determine that the TCI state used for receiving the PDSCH corresponds to one TCI state (first and second embodiments).
- the control unit 210 may determine that the TCI state used for receiving the PDSCH corresponds to two TCI states (first and second embodiments).
- each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.
- a functional block may be implemented by combining software in the one device or the plurality of devices.
- function includes judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deem , broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (component) that performs transmission may be called a transmitting unit, a transmitter, or the like. In either case, as described above, the implementation method is not particularly limited.
- a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 9 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to one embodiment.
- the base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. .
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.
- processor 1001 may be implemented by one or more chips.
- predetermined software program
- the processor 1001 performs calculations, communication via the communication device 1004 and at least one of reading and writing data in the memory 1002 and the storage 1003 .
- the processor 1001 operates an operating system and controls the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like.
- CPU central processing unit
- control unit 110 210
- transmission/reception unit 120 220
- FIG. 10 FIG. 10
- the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them.
- programs program codes
- software modules software modules
- data etc.
- the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be similarly implemented.
- the memory 1002 is a computer-readable recording medium, such as Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or at least any other suitable storage medium. may be configured by one.
- the memory 1002 may also be called a register, cache, main memory (main storage device), or the like.
- the memory 1002 can store executable programs (program code), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also be called an auxiliary storage device.
- a computer-readable recording medium for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also
- the communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes a high-frequency switch, duplexer, filter, frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD), for example. may be configured to include
- the transmitting/receiving unit 120 (220), the transmitting/receiving antenna 130 (230), and the like described above may be realized by the communication device 1004.
- the transmitter/receiver 120 (220) may be physically or logically separated into a transmitter 120a (220a) and a receiver 120b (220b).
- the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
- Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses between devices.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. It may be configured including hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.
- DSP digital signal processor
- ASIC application specific integrated circuit
- PLD programmable logic device
- FPGA field programmable gate array
- a signal may also be a message.
- a reference signal may be abbreviated as RS, and may also be called a pilot, a pilot signal, etc., depending on the applicable standard.
- a component carrier may also be called a cell, a frequency carrier, a carrier frequency, or the like.
- a radio frame may consist of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) that make up a radio frame may be called a subframe.
- a subframe may consist of one or more slots in the time domain.
- a subframe may be a fixed time length (eg, 1 ms) independent of numerology.
- a numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel.
- Numerology for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration , a particular filtering process performed by the transceiver in the frequency domain, a particular windowing process performed by the transceiver in the time domain, and/or the like.
- a slot may consist of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may also be a unit of time based on numerology.
- a slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) transmitted in time units larger than a minislot may be referred to as PDSCH (PUSCH) Mapping Type A.
- PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.
- Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.
- one subframe may be called a TTI
- a plurality of consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum scheduling time unit in wireless communication.
- a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis.
- radio resources frequency bandwidth, transmission power, etc. that can be used by each user terminal
- a TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, or the like.
- a TTI that is shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
- the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms
- the short TTI e.g., shortened TTI, etc.
- a TTI having the above TTI length may be read instead.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain.
- the number of subcarriers included in the RB may be the same regardless of the neumerology, eg twelve.
- the number of subcarriers included in an RB may be determined based on neumerology.
- an RB may contain one or more symbols in the time domain and may be 1 slot, 1 minislot, 1 subframe or 1 TTI long.
- One TTI, one subframe, etc. may each be configured with one or more resource blocks.
- One or more RBs are Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB Also called a pair.
- PRB Physical Resource Block
- SCG Sub-Carrier Group
- REG Resource Element Group
- PRB pair RB Also called a pair.
- a resource block may be composed of one or more resource elements (Resource Element (RE)).
- RE resource elements
- 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
- a Bandwidth Part (which may also be called a bandwidth part) represents a subset of contiguous common resource blocks (RBs) for a numerology on a carrier.
- the common RB may be identified by an RB index based on the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP for UL
- BWP for DL DL BWP
- One or multiple BWPs may be configured for a UE within one carrier.
- At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP.
- BWP bitmap
- radio frames, subframes, slots, minislots, symbols, etc. described above are merely examples.
- the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers and the number of symbols in a TTI, symbol length, cyclic prefix (CP) length, etc. can be varied.
- the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indicated by a predetermined index.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of
- information, signals, etc. can be output from a higher layer to a lower layer and/or from a lower layer to a higher layer.
- Information, signals, etc. may be input and output through multiple network nodes.
- Input/output information, signals, etc. may be stored in a specific location (for example, memory), or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated or appended. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to other devices.
- Uplink Control Information (UCI) Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may also be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like.
- RRC signaling may also be called an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.
- MAC signaling may be notified using, for example, a MAC Control Element (CE).
- CE MAC Control Element
- notification of predetermined information is not limited to explicit notification, but implicit notification (for example, by not notifying the predetermined information or by providing another information by notice of
- the determination may be made by a value (0 or 1) represented by 1 bit, or by a boolean value represented by true or false. , may be performed by numerical comparison (eg, comparison with a predetermined value).
- Software whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) , a server, or other remote source, these wired and/or wireless technologies are included within the definition of transmission media.
- a “network” may refer to devices (eg, base stations) included in a network.
- precoding "precoding weight”
- QCL Quality of Co-Location
- TCI state Transmission Configuration Indication state
- spatialal patial relation
- spatialal domain filter "transmission power”
- phase rotation "antenna port
- antenna port group "layer”
- number of layers Terms such as “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, “panel” are interchangeable. can be used as intended.
- base station BS
- radio base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission Point (TP)”, “Reception Point (RP)”, “Transmission/Reception Point (TRP)”, “Panel”
- a base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.
- a base station can accommodate one or more (eg, three) cells.
- the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is assigned to a base station subsystem (e.g., a small indoor base station (Remote Radio)). Head (RRH))) may also provide communication services.
- a base station subsystem e.g., a small indoor base station (Remote Radio)). Head (RRH)
- RRH Head
- the terms "cell” or “sector” refer to part or all of the coverage area of at least one of the base stations and base station subsystems that serve communication within such coverage.
- MS Mobile Station
- UE User Equipment
- Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , a handset, a user agent, a mobile client, a client, or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like.
- the mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ).
- at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.
- at least one of the base station and mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read as a user terminal.
- communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.)
- 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 of the base station 10 described above.
- words such as "up” and “down” may be replaced with words corresponding to communication between terminals (for example, "sidelink”).
- uplink channels, downlink channels, etc. may be read as sidelink channels.
- user terminals in the present disclosure may be read as base stations.
- the base station 10 may have the functions of the user terminal 20 described above.
- operations that are assumed to be performed by the base station may be performed by its upper node in some cases.
- various operations performed for communication with a terminal may involve the base station, one or more network nodes other than the base station (e.g., Clearly, this can be done by a Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. (but not limited to these) or a combination thereof.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching along with execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG xG (xG (x is, for example, an integer or a decimal number)
- Future Radio Access FAA
- RAT New - Radio Access Technology
- NR New Radio
- NX New radio access
- FX Future generation radio access
- GSM registered trademark
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi®
- IEEE 802.16 WiMAX®
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth®, or other suitable wireless It may be applied to systems using communication methods, next-generation systems extended based on these, and the like. Also, multiple systems may be applied to systems using communication methods, next-generation systems extended based on these, and the like
- any reference to elements using the "first,” “second,” etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.
- determining includes judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry ( For example, looking up in a table, database, or another data structure), ascertaining, etc. may be considered to be “determining.”
- determining (deciding) includes receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access ( accessing (e.g., accessing data in memory), etc.
- determining is considered to be “determining” resolving, selecting, choosing, establishing, comparing, etc. good too. That is, “determine (determine)” may be regarded as “determining (determining)” some action.
- Maximum transmit power described in this disclosure may mean the maximum value of transmit power, may mean the nominal maximum transmit power (the nominal UE maximum transmit power), or may mean the rated maximum transmit power (the rated UE maximum transmit power).
- connection refers to any connection or coupling, direct or indirect, between two or more elements. and can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other. Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection” may be read as "access”.
- radio frequency domain when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, radio frequency domain, microwave They can be considered to be “connected” or “coupled” together using the domain, electromagnetic energy having wavelengths in the optical (both visible and invisible) domain, and the like.
- a and B are different may mean “A and B are different from each other.”
- the term may also mean that "A and B are different from C”.
- Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”
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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。
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。
SFNを利用するPDSCH(例えば、上述のスキーム1)をスケジュールするPDCCHは、下記想定1から想定3に記載されるPDCCHが考えられる:
想定1:Rel.15までに規定されるPDCCH(例えば、シングルTRPを利用するPDCCH)。
想定2:Rel.17以降に規定されるPDCCH(例えば、SFNを利用するPDCCH)。
想定3:Rel.17以降に規定されるPDCCH(例えば、PDCCHの繰り返し送信(PDCCH repetition))。
PDSCHがTCIフィールドを有するDCIでスケジュールされる場合、NW(例えば、基地局)は、TCIフィールドで、シングルTRP PDSCH又はSFN PDSCHを指示してもよい。PDSCHがTCIフィールドを有するDCIでスケジュールされる場合、UEは、少なくともTCIフィールドに基づいて、シングルTRP PDSCH又はSFN PDSCHを判断してもよい。
第1の実施形態は、PDSCHがTCIフィールドを有さないDCIでスケジュールされる場合、及び、スケジューリングオフセットが閾値(timeDurationForQCL)以上である場合の、少なくとも一方において適用されてもよい。
PDSCHのTCI状態又はQCL想定は、特定のCORESETのTCI状態又はQCL想定と同じであってもよい。UEは、PDSCHのTCI状態又はQCL想定が、特定のCORESETのTCI状態又はQCL想定と同じであると想定/判断してもよい。当該特定のCORESETは、PDSCHをスケジュールするDCI(スケジューリングDCI)のCORESETであってもよい。
PDSCHのTCI状態又はQCL想定は、1つのTCI状態(シングルTRP)と対応してもよい(1つのTCI状態であってもよい)。UEは、PDSCHのTCI状態又はQCL想定が、1つのTCI状態に対応すると想定/判断してもよい。このとき、UEは、シングルTRPを想定してもよい。
PDSCHのTCI状態又はQCL想定は、複数(例えば、2つ)のTCI状態と対応してもよい(複数のTCI状態であってもよい)。UEは、PDSCHのTCI状態又はQCL想定が、複数(例えば、2つ)のTCI状態に対応すると想定/判断してもよい。
第2の実施形態は、スケジューリングオフセットが閾値(timeDurationForQCL)より小さい場合において適用されてもよい。
PDSCHのTCI状態又はQCL想定は、特定のCORESETのTCI状態又はQCL想定と同じであってもよい。UEは、PDSCHのTCI状態又はQCL想定が、特定のCORESETのTCI状態又はQCL想定と同じであると想定/判断してもよい。当該特定のCORESETは、特定のスロット(例えば、最新の(latest)スロット)における、最小(又は、最大)のCORESET IDに対応するCORESETであってもよい。
PDSCHのTCI状態又はQCL想定は、1つのTCI状態(シングルTRP)と対応してもよい(1つのTCI状態であってもよい)。UEは、PDSCHのTCI状態又はQCL想定が、1つのTCI状態に対応すると想定/判断してもよい。このとき、UEは、シングルTRPを想定してもよい。
PDSCHのTCI状態又はQCL想定は、複数(例えば、2つ)のTCI状態と対応してもよい(複数のTCI状態であってもよい)。UEは、PDSCHのTCI状態又はQCL想定が、複数(例えば、2つ)のTCI状態に対応すると想定/判断してもよい。
以上の複数の実施形態の少なくとも1つにおける機能(特徴、feature)に対応する上位レイヤパラメータ(RRC IE)/UE能力(capability)が規定されてもよい。UE能力は、この機能をサポートすることを示してもよい。
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7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8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)
- 物理下りリンク共有チャネル(PDSCH)をスケジュールする下りリンク制御情報(DCI)を受信する受信部と、
前記DCI内の、前記PDSCHの送信設定指示(TCI)状態を指示するフィールドの存在に基づいて、前記PDSCHが、単一の送受信ポイントからのPDSCH、single frequency network(SFN)を利用するPDSCH、又は、PDSCHの繰り返し送信のいずれかであるかと、前記PDSCHの受信に適用するTCI状態と、を判断する制御部と、を有する端末。 - 前記制御部は、前記PDSCHの受信に用いる前記TCI状態が、特定の制御リソースセットに対応するTCI状態と同じTCI状態であると判断する請求項1に記載の端末。
- 前記制御部は、前記PDSCHの受信に用いる前記TCI状態が、1つのTCI状態に対応すると判断する請求項1に記載の端末。
- 前記制御部は、前記PDSCHの受信に用いる前記TCI状態が、2つのTCI状態に対応すると判断する請求項1に記載の端末。
- 物理下りリンク共有チャネル(PDSCH)をスケジュールする下りリンク制御情報(DCI)を受信するステップと、
前記DCI内の、前記PDSCHの送信設定指示(TCI)状態を指示するフィールドの存在に基づいて、前記PDSCHが、単一の送受信ポイントからのPDSCH、single frequency network(SFN)を利用するPDSCH、又は、PDSCHの繰り返し送信のいずれかであるかと、前記PDSCHの受信に適用するTCI状態と、を判断するステップと、を有する端末の無線通信方法。 - 物理下りリンク共有チャネル(PDSCH)をスケジュールする下りリンク制御情報(DCI)を送信し、前記DCI内には、前記PDSCHの送信設定指示(TCI)状態を指示するフィールドが存在する又は存在しない、送信部と、
前記PDSCHにTCI状態を適用する制御部と、を有し、
前記DCI内の前記フィールドの存在に基づいて、前記PDSCHが、単一の送受信ポイントからのPDSCH、single frequency network(SFN)を利用するPDSCH、又は、PDSCHの繰り返し送信のいずれかであるかと、前記PDSCHの送信に適用される前記TCI状態と、が判断される、基地局。
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