WO2022059072A1 - 端末、無線通信方法及び基地局 - Google Patents
端末、無線通信方法及び基地局 Download PDFInfo
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W16/28—Cell structures using beam steering
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Definitions
- This disclosure relates to terminals, wireless communication methods and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- UMTS Universal Mobile Telecommunications System
- 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).
- a successor system to LTE for example, 5th generation mobile communication system (5G), 5G + (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 or later, etc.
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- the user terminal (terminal, user terminal, User Equipment (UE)) is the information (QCL assumption / Transmission Configuration Indication (QCL assumption / Transmission Configuration Indication) regarding the pseudo collocation (Quasi-Co-Location (QCL)). Controlling transmission / reception processing based on TCI) state / spatial relationship) is being studied.
- QCL assumption / Transmission Configuration Indication QCL assumption / Transmission Configuration Indication
- QCL Quasi-Co-Location
- the information about QCL is not clear. If the information about the QCL is not clear, it may lead to a decrease in communication quality, a decrease in throughput, and the like.
- one of the purposes of this disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately determine information regarding the QCL.
- the terminal includes a receiving unit for receiving downlink control information common to the group, which indicates a transmission setting instruction (TCI) state, and feedback information indicating success or failure in receiving the downlink control information. It has a control unit that controls transmission.
- TCI transmission setting instruction
- information regarding the QCL can be appropriately determined.
- FIG. 1 is a diagram showing an example of a common beam for both DL and UL.
- FIG. 2 is a diagram showing an example of a common beam for DL and a common beam for UL.
- FIG. 3 is a diagram showing an example of use case 0.
- FIG. 4 is a diagram showing an example of use case 1.
- FIG. 5 is a diagram showing an example of use case 2.
- FIG. 6 is a diagram showing an example of a TCI state for a UE group.
- FIG. 7 is a diagram showing an example of setting 1 according to the first embodiment.
- FIG. 8 is a diagram showing an example of setting 2 according to the first embodiment.
- 9A and 9B are diagrams showing an example of updating the TCI assumption according to the first embodiment.
- FIG. 10A and 10B are diagrams showing an example of success / failure of reception of group common DCI.
- FIG. 11 is a diagram showing an example of the PUCCH resource setting according to the aspect 3-1.
- FIG. 12 is a diagram showing an example of the PUCCH resource setting according to the aspect 3-2.
- 13A and 13B are diagrams showing an example of a group common PUCCH resource.
- FIG. 14 is a diagram showing an example of the operation according to the aspect 3-3.
- FIG. 15 is a diagram showing an example of the operation according to the aspect 3-4.
- FIG. 16 is a diagram showing an example of the operation according to the fourth embodiment.
- FIG. 17 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 18 is a diagram showing an example of the configuration of the base station according to the embodiment.
- FIG. 19 is a diagram showing an example of the configuration of a user terminal according to an embodiment.
- FIG. 20 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- reception processing for example, reception, demapping, demodulation, etc.
- transmission processing e.g., at least one of transmission, mapping, precoding, modulation, and coding
- the TCI state may represent what applies to the downlink signal / channel.
- the equivalent of the TCI state applied to the uplink signal / channel may be expressed as a spatial relation.
- the TCI state is information related to signal / channel pseudo collocation (Quasi-Co-Location (QCL)), and may be called spatial reception parameters, spatial relation information, or the like.
- QCL Quality of Service
- the TCI state may be set in the UE per channel or per signal.
- QCL is an index showing the statistical properties of signals / channels. For example, when one signal / channel and another signal / channel have a QCL relationship, Doppler shift, Doppler spread, and average delay are performed between these different signals / channels. ), Delay spread, and spatial parameter (for example, spatial Rx parameter) can be assumed to be the same (QCL for at least one of these). You may.
- the spatial reception parameter may correspond to the received beam of the UE (for example, the received analog beam), or the beam may be specified based on the spatial QCL.
- the QCL (or at least one element of the QCL) in the present disclosure may be read as sQCL (spatial QCL).
- QCL types A plurality of types (QCL types) may be specified for the QCL.
- QCL types AD QCL types with different parameters (or parameter sets) that can be assumed to be the same may be provided, and the parameters (may be referred to as QCL parameters) are shown below: QCL type A (QCL-A): Doppler shift, Doppler spread, average delay and delay spread, -QCL type B (QCL-B): Doppler shift and Doppler spread, QCL type C (QCL-C): Doppler shift and average delay, -QCL type D (QCL-D): Spatial reception parameter.
- QCL-A Doppler shift, Doppler spread, average delay and delay spread
- -QCL type B QCL type B
- QCL type C QCL type C
- QCL-D Spatial reception parameter.
- the UE assumes that one control resource set (Control Resource Set (CORESET)) has a specific QCL (eg, QCL type D) relationship with another CORESET, channel or reference signal. It may be called a QCL assumption.
- CORESET Control Resource Set
- QCL QCL type D
- the UE may determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI state of the signal / channel or the QCL assumption.
- the TCI state may be, for example, information about the QCL of the target channel (in other words, the reference signal for the channel (Reference Signal (RS))) and another signal (for example, another RS). ..
- the TCI state may be set (instructed) by higher layer signaling, physical layer signaling, or a combination thereof.
- the physical layer signaling may be, for example, downlink control information (DCI).
- DCI downlink control information
- the channels for which the TCI state or spatial relationship is set are, for example, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), and an uplink shared channel (Physical Uplink Shared). It may be at least one of Channel (PUSCH)) and uplink control channel (Physical Uplink Control Channel (PUCCH)).
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Downlink Control Channel
- PUSCH Physical Uplink Control Channel
- the RS having a QCL relationship with the channel is, for example, a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a measurement reference signal (Sounding). It may be at least one of Reference Signal (SRS)), CSI-RS for tracking (also referred to as Tracking Reference Signal (TRS)), and reference signal for QCL detection (also referred to as QRS).
- SSB Synchronization Signal Block
- CSI-RS Channel State Information Reference Signal
- Sounding Sounding
- SRS Reference Signal
- TRS Tracking Reference Signal
- QRS reference signal for QCL detection
- the SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a broadcast channel (Physical Broadcast Channel (PBCH)).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- PBCH Physical Broadcast Channel
- the SSB may be referred to as an SS / PBCH block.
- the RS of the QCL type X in the TCI state may mean an RS having a relationship between a certain channel / signal (DMRS) and the QCL type X, and this RS is called the QCL source of the QCL type X in the TCI state. You may.
- DMRS channel / signal
- the path loss PL b, f, c (q d ) [dB] in the transmission power control of PUSCH, PUCCH, and SRS is a reference signal (RS,) for the downlink BWP associated with the active UL BWP b of the carrier f of the serving cell c.
- RS reference signal
- the path loss reference RS, path loss (PL) -RS, index q d , RS used for path loss calculation, and RS resource used for path loss calculation may be read as each other.
- calculations, estimates, measurements, and tracks may be read interchangeably.
- the path loss measurement based on L1-RSRP may be applied. Even if the upper layer filter RSRP is used for path loss measurement and L1-RSRP is used for path loss measurement before the upper layer filter RSRP is applied at the available timing after MAC CE for path loss RS update. good. At the available timing after the MAC CE for updating the path loss RS, the upper layer filter RSRP may be used for the path loss measurement, and the upper layer filter RSRP of the previous path loss RS may be used before that timing. .. Rel. Similar to the operation of 15, the upper layer filter RSRP is used for the path loss measurement, and the UE may track all the path loss RS candidates set by the RRC.
- the maximum number of path loss RSs that can be set by the RRC may depend on the UE capability. When the maximum number of path loss RSs that can be set by RRC is X, path loss RS candidates of X or less may be set by RRC, and path loss RS may be selected by MAC CE from the set path loss RS candidates.
- the maximum number of path loss RSs that can be set by RRC may be 4, 8, 16, 64, or the like.
- the upper layer filter RSRP, the filtered RSRP, and the layer 3 filter RSRP may be read as each other.
- DL DCI (PDSCH) is set both when the TCI information in DCI (upper layer parameter TCI-PresentInDCI) is set to "enabled” and when the TCI information in DCI is not set.
- TCI-PresentInDCI TCI information in DCI
- Non-cross-carrier scheduling if the time offset between the receipt of the scheduled DCI) and the corresponding PDSCH (PDSCH scheduled by the DCI) is less than the threshold (timeDurationForQCL) (applicable condition, first condition).
- the TCI state (default TCI state) of the PDSCH may be the TCI state of the lowest CORESET ID in the latest slot in the active DL BWP of the CC (of the specific UL signal). Otherwise, the PDSCH TCI state (default TCI state) may be the TCI state of the PDSCH's lowest TCI state ID in the active DL BWP of the scheduled CC.
- an individual MAC CE of a MAC CE for activation / deactivation related to PUCCH space and a MAC CE for activation / deactivation related to SRS space is required.
- the PUSCH spatial relationship follows the SRS spatial relationship.
- At least one of the MAC CE for activation / deactivation related to PUCCH space and the MAC CE for activation / deactivation related to SRS space may not be used.
- both the spatial relationship for PUCCH and PL-RS are not set in FR2 (applicable condition, second condition), the spatial relationship for PUCCH and the default assumption of PL-RS (default spatial relationship and default PL-RS). Is applied. If both the spatial relationship and PL-RS for SRS (SRS resource for SRS or SRS resource corresponding to SRI in DCI format 0_1 for scheduling PUSCH) are not set in FR2 (applicable condition, second condition). Spatial relationships and PL-RS default assumptions (default spatial relationships and default PL-RS) apply to PUSCH and SRS scheduled by DCI format 0_1.
- the default spatial relationship and default PL-RS are based on the TCI state or QCL assumption of the CORESET having the lowest CORESET ID in the active DL BWP. There may be. If CORESET is not set in the active DL BWP on the CC, the default spatial relationship and the default PL-RS may be the active TCI state with the lowest ID of the PDSCH in the active DL BWP.
- the spatial relationship of the PUSCH scheduled by DCI format 0_0 follows the spatial relationship of the PUCCH resource having the lowest PUCCH resource ID among the active spatial relationships of the PUCCH on the same CC.
- the network needs to update the PUCCH spatial relationships on all SCells, even if the PUCCHs are not transmitted on the SCells.
- the application condition of the default spatial relationship for SRS / default PL-RS may include that the default beam path loss enablement information element for SRS (upper layer parameter enableDefaultBeamPlForSRS) is effectively set.
- the application condition of the default spatial relationship / default PL-RS for PUCCH may include that the default beam path loss enablement information element for PUCCH (upper layer parameter enableDefaultBeamPlForPUCCH) is effectively set.
- the default spatial relationship / default PL-RS application condition for PUSCH scheduled by DCI format 0_0 is that the default beam path loss enablement information element for PUSCH scheduled by DCI format 0_0 (upper layer parameter enableDefaultBeamPlForPUSCH0_0) is effectively set. May include that.
- the above thresholds are the QCL time duration, "timeDurationForQCL”, “Threshold”, “Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI”, “Threshold-Sched-Offset”, and schedule. It may be called an offset threshold value, a scheduling offset threshold value, or the like.
- Multi TRP In the NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP (multi TRP (MTRP))) are used for the UE using one or more panels (multi-panel). It is being considered to perform DL transmission. It is also being considered that the UE performs UL transmission to one or more TRPs using one or more panels.
- TRP Transmission / Reception Point
- MTRP multi TRP
- the 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.
- the multi-TRP (for example, TRP # 1 and # 2) may be connected by an ideal / non-ideal backhaul, and information, data, etc. may be exchanged.
- Different code words Code Word (CW)
- CW Code Word
- Different layers may be transmitted from each TRP of the multi-TRP.
- NJT non-coherent joint transmission
- TRP # 1 modulation-maps the first codeword, layer-maps it, and transmits the first PDSCH to the first number of layers (eg, the second layer) using the first precoding.
- TRP # 2 modulates and maps the second codeword, layer-maps the second number of layers (for example, two layers), and transmits the second PDSCH using the second precoding.
- the plurality of PDSCHs (multi-PDSCHs) to be NCJT may be defined as partially or completely overlapping with respect to 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 the time and frequency resources.
- first PDSCH and second PDSCH may be assumed to be not quasi-co-located in a pseudo-collocation (Quasi-Co-Location (QCL)) relationship.
- the reception of the multi-PDSCH may be read as the simultaneous reception of PDSCHs that are not of a certain QCL type (for example, QCL type D).
- Multiple PDSCHs from multiple TRPs may be scheduled using one DCI (single DCI, single PDCCH) (based on single master mode, single DCI).
- Multi TRP single-DCI based multi-TRP.
- Multiple PDSCHs from the multi-TRP may be scheduled using multiple DCIs (multi-DCI, multi-PDCCH (multiple PDCCH)), respectively (multi-master mode, multi-DCI based multi-). TRP)).
- one control resource set (CORESET) in the PDCCH setting information (PDCCH-Config) may correspond to one TRP.
- UL and DL channels can be controlled by a common framework.
- the unified TCI framework is Rel. Rather than defining the TCI state or spatial relationship for each channel as in 15, a common beam may be indicated and applied to all UL and DL channels, or a common beam for UL may be applied to UL. It may be applied to all channels and a common beam for DL may be applied to all channels of DL.
- the UE may assume the same TCI state (joint TCI state, joint TCI state pool) for UL and DL.
- RRC sets a plurality of TCI states (joint common TCI state pool) for both DL and UL.
- Each of the plurality of TCI states may be SSB, CSI-RS, or SRS.
- MAC CE may activate a part of a plurality of set TCI states.
- the DCI may indicate at least one of the activated TCI states.
- UL and DL default beams may be aligned by beam management based on MAC CE.
- the default TCI state of PDSCH may be updated to match the default UL beam (spatial relationship).
- Beam management based on DCI may indicate a common beam / unified TCI state from the same TCI state pool (joint common TCI state pool) for both UL and DL.
- M TCI states may be activated by MAC CE.
- UL / DL DCI may select one from M active TCI states.
- the selected TCI state may be applied to both UL and DL channels / RS.
- the UE assumes different TCI states (separate TCI state, separate TCI state pool, UL separate TCI state pool and DL separate TCI state pool, UL common TCI state pool and DL common TCI state pool) for each of UL and DL. You may.
- the RRC may set a plurality of TCI states (pools) for each of the UL and DL channels.
- MAC CE may select (activate) one or more (for example, a plurality) TCI states (sets) for each of UL and DL channels. MAC CE may activate two sets of TCI states.
- the DL DCI may select (instruct) one or more (for example, one) TCI states. This TCI state may be applied to one or more DL channels.
- the DL channel may be PDCCH / PDSCH / CSI-RS.
- the UE is Rel.
- the operation of the TCI state of 16 (TCI framework) may be used to determine the TCI state of each channel / RS of the DL.
- UL DCI may select (instruct) one or more (for example, one) TCI states. This TCI state may be applied to one or more UL channels.
- the UL channel may be PUSCH / SRS / PUCCH.
- the UL of the panel # 1 receives the MPE problem, and the UE uses the panel # 2 for the UL.
- the distance between the UE and TRP (cell, base station) # 1 is longer than the distance between the UE and TRP # 2.
- the L1-RSRP of the panel # 1 is higher than the L1-RSRP of the panel # 2
- the UL transmission power of the panel # 2 is higher than the UL transmission power of the panel # 1.
- the UE uses panel # 1 for DL from TRP # 1 and panel # 2 for UL to TRP # 2.
- the L1-RSRP of the panel # 1 is higher than the L1-RSRP of the panel # 2, and the UL load of the panel # 2 is lower than the UL load of the panel # 1.
- the UE uses panel # 1 for DL from TRP # 1 and panel # 2 for UL to TRP # 2.
- HST high speed train
- the common beam may be different.
- the UE may be provided with a multi-panel for FR2.
- the common beam for each UE panel may be different.
- the present inventors have conceived a method for instructing the TCI state.
- a / B / C and “at least one of A, B and C” may be read interchangeably.
- cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as each other.
- the index, the ID, the indicator, and the resource ID may be read as each other.
- support, control, controllable, working, working may be read interchangeably.
- configuration, activate, update, indicate, enable, specify, and select may be read as each other.
- MAC CE and activation / deactivation commands may be read interchangeably.
- the upper layer signaling may be, for example, any one of 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 (IE), and RRC messages may be read interchangeably.
- MAC CE MAC Control Element
- PDU MAC Protocol Data Unit
- the broadcast information includes, for example, a master information block (Master Information Block (MIB)), a system information block (System Information Block (SIB)), a minimum system information (Remaining Minimum System Information (RMSI)), and other system information ( Other System Information (OSI)) may be used.
- MIB Master Information Block
- SIB System Information Block
- RMSI Minimum System Information
- OSI Other System Information
- 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 transmission filter, UE spatial domain transmission filter, UE transmission beam, UL beam, UL transmission beam, UL precoding, UL precoder, PL-RS may be read as each other.
- the QCL type X-RS, the DL-RS associated with the QCL type X, the DL-RS having the QCL type X, the source of the DL-RS, the SSB, the CSI-RS, and the SRS may be read as each other. good.
- the DL DCI, the DCI that schedules the DL channel (PDSCH), and the DCI format 1_x (x 0, 1, 2, 7) may be read as each other.
- HARQ-ACK information, ACK, and NACK may be read as each other.
- single TRP, single TRP system, single TRP transmission, and single PDSCH may be read as each other.
- multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be read as each other.
- single DCI, single PDCCH, single DCI-based multi-TRP, and activation of two TCI states on at least one TCI code point may be read interchangeably.
- a single TRP a channel using a single TRP, a channel using one TCI state / spatial relationship, a multi-TRP not enabled by RRC / DCI, and multiple TCI states / spatial relationships enabled by RRC / DCI.
- no CORESETPoolIndex value of 1 is set for any CORESET, and no code point in the TCI field is mapped to two TCI states, may be read interchangeably. ..
- a multi-TRP a channel using a multi-TRP, a channel using a plurality of TCI states / spatial relationships, a multi-TRP being enabled by RRC / DCI, and a plurality of TCI states / spatial relationships being enabled by RRC / DCI.
- At least one of the multi-TRP based on the single DCI and the multi-TRP based on the multi-DCI may be read as each other.
- setting a CORESET pool index (CORESETPoolIndex) value of 1 for a multi-TRP and CORESET based on a multi-DCI may be read as interchangeable with each other.
- the mapping of at least one code point of a single DCI-based multi-TRP, TCI field to two TCI states may be read interchangeably.
- one of the link direction, the downlink (DL), the uplink (UL), UL and the DL may be read as each other.
- pools, sets, groups, lists may be read interchangeably.
- the common beam, the unified TCI state, the beam applicable to DL and UL, the beam applied to a plurality of channels, and PL-RS may be read as each other.
- the UE may set a plurality of TCI states (pools) applicable to a plurality of channels / RS by an RRC information element (TCI state information).
- TCI state information may be set a TCI state pool (joint TCI state pool) for both UL and DL, or may set a TCI state pool for UL and a TCI state pool for DL (separate TCI state pool). ..
- Multiple TCI states in the TCI state pool may be activated by MAC CE (TCI state information).
- the DCI may apply one TCI state indicated by the DCI out of a plurality of configured / activated TCI states to one or more UL / DL channels / RSs (signals).
- the group common PDCCH may indicate the TCI state in the common TCI state to one or more UEs.
- a new DCI field in the TCI state may be introduced into the existing group common DCI (DCI format 2_0, 2_1, 2_2, 2_3).
- a new DCI format may be introduced to indicate the TCI state in the common TCI state to one or more UEs.
- This new DCI format (eg, DCI format 2_x) may have a TCI state field. If the corresponding higher layer signaling is configured, the UE may monitor the new DCI format.
- the upper layer setting of the unified TCI state may follow at least one of the following settings 1 and 2.
- the same value in the TCI field may indicate different TCI states for multiple UEs.
- a plurality of UE-specific TCI states (lists) may be set for each of the plurality of UEs.
- Multiple TCI states may each be mapped to multiple values in the TCI field.
- Each UE may use the TCI state corresponding to the value of the TCI field among the plurality of set TCI states for transmission / reception of a specific channel / RS.
- TCI states # 1-1 to # 1-8 corresponding to the values 000 to 111 of the TCI field, respectively, may be set for UE # 1.
- TCI states # 2-1 to # 2-8 corresponding to the values 000 to 111 of the TCI field, respectively, may be set for UE # 2.
- TCI states # 3-1 to # 3-8 corresponding to the values 000 to 111 of the TCI field, respectively, may be set for UE # 3.
- [Setting 2] Common to UEs.
- the same value in the TCI field may indicate the same TCI state to multiple UEs.
- a common plurality of TCI states (lists) may be set for each of the plurality of UEs. Multiple TCI states may each be mapped to multiple values in the TCI field.
- Each UE may use the TCI state corresponding to the value of the TCI field among the set TCI states among the set TCI states for transmission / reception of a specific channel / RS.
- TCI states # 1-1 to # 1-8 corresponding to the values 000 to 111 of the TCI field may be set for UEs # 1 to # 3, respectively.
- the UE may update the TCI assumption after a specific time from the detection of the group common DCI (FIG. 9A).
- the detection of the group common DCI, the last symbol of the group common DCI, may be read interchangeably.
- the UE may update the TCI assumption after a specific time from the transmission of the HARQ-ACK information (FIG. 9B).
- the UE may update the TCI assumption when this HARQ-ACK information is ACK.
- the specific time may be, for example, a K symbol.
- K may be specified in the specification, set by a higher layer, or reported by the UE as a UE capability.
- a group common DCI that updates the unified TCI status for both UL and DL for UEs # 1 to # 6 is transmitted from UEs # 1 to # 6.
- the beam is updated to the designated unified TCI state after the instruction by the group common DCI.
- UEs # 3- # 6 that have normally received the group common DCI update the beam to the designated unified TCI state after being instructed by the group common DCI. ..
- UEs # 1 to # 6 that could not normally receive the group common DCI do not update the beam.
- each UE may transmit HARQ-ACK information (feedback information) on each PUCCH / PUSCH resource according to the group common DCI.
- the HARQ-ACK information may indicate success (ACK) or failure (NACK) of reception / detection / decoding of the group common DCI.
- the PUCCH / PUSCH resource may follow at least one of the following resources 1 and 2.
- the PUCCH resource and slot may be determined by that field.
- PRI PUCCH resource indicator
- HARQ timing indicator field the PUCCH resource and slot may be determined by that field.
- the PUCCH resource may be determined by the PUCCH resource set and the PUCCH resource determination method before establishing the RRC connection (when the individual PUCCH resource is not provided).
- the UE determines the PUCCH resource set based on the parameters provided by the system information (SIB1) and the PUCCH resource set based on the PDCCH (PRI field / first control channel element (CCE) index). Determine the PUCCH resource from.
- SIB1 system information
- CCE first control channel element
- the HARQ timing indicator field may or may not be included in the group common DCI. If the HARQ timing indicator field is not included in the group common DCI, the HARQ timing may be specified in the specification, set by a higher layer, or reported by the UE as a UE capability.
- the recognition of the TCI state between the UE and the base station can be matched.
- HARQ resources for group common PDCCH with TCI instructions may follow at least one of the following embodiments 3-1 to 3-4.
- Aspect 3-1 >> UE-specific PUCCH / PUSCH resource Aspect 3-1 may follow at least one of the following aspects 3-1-1 and 3-1-2.
- the PRI / HARQ timing indicator may have multiple fields for multiple UEs.
- the PRI / HARQ timing indicator may have one field used for multiple UEs.
- the upper layer setting of the PUCCH resource may be unique to the UE.
- the same PRI field may point to different PUCCH resources for multiple UEs.
- a plurality of UE-specific PUCCH resources may be set for each of the plurality of UEs.
- Multiple PUCCH resources may each be mapped to multiple values in the PRI field.
- Each UE may use the PUCCH resource corresponding to the value of the PRI field among the plurality of set PUCCH resources for transmitting the HARQ-ACK information.
- PUCCU resources # 1-1 to # 1-8 corresponding to the values 000 to 111 of the PRI field may be set for UE # 1.
- PUCCU resources # 2-1 to # 2-8 corresponding to the values 000 to 111 of the PRI field, respectively, may be set for UE # 2.
- PUCCU resources # 3-1 to # 3-8 corresponding to the values 000 to 111 of the PRI field, respectively, may be set for UE # 3.
- the mapping between the PRI and PUCCH resource lists for multiple UEs may be set by the upper layer.
- the new DCI format may have multiple fields of PRI / HARQ timing indicators. Each field may indicate a HARQ resource for one UE according to the order of C-RNTI. According to RRC, each field may point to HARQ resources for multiple UEs.
- UE Common PUCCH / PUSCH Resource Aspect 3-2 may follow at least one of the following aspects 3-2-1 and 3-2-2.
- the UE may transmit HARQ-ACK information in the PUCCH resource.
- Multiple UEs may share the same PUCCH resource.
- a plurality of common PUCCH resources (lists) may be set for each of the plurality of UEs.
- Multiple PUCCH resources may each be mapped to multiple values in the PRI field.
- Each UE may use the PUCCH resource corresponding to the value of the PRI field among the plurality of set PUCCH resources for transmitting the HARQ-ACK information.
- PUCCH resources # 1-1 to # 1-8 corresponding to the values 000 to 111 of the PRI field may be set for UEs # 1 to # 3, respectively.
- the UE may transmit a PUCCH with an ACK.
- the UE does not have to feed back NACK.
- the NW If the network (NW, eg, base station) distinguishes between PUCCH / PUSCH from different UEs, the NW considers that there is no beam update for UEs that do not provide feedback (due to NACK or group common DCI detection failure). You may.
- the NW will partition PUCCH / PUSCH from different UEs by power domain / time domain / frequency domain / code domain (series, cyclic shift). It may be separated.
- the UE may send a PUCCH with NACK. If the NW receives a NACK, the NW may recognize that at least one UE has not successfully received the group common DCI. If the NACK feedback is not received by the NW, the case of failure to receive the group common DCI is not recognized by the NW.
- PUCCH resources that overlap in the time domain and the frequency domain are allocated to UEs # 1 to # 4.
- the UE that cannot normally decode the group common DCI transmits NACK using PUCCH format 0.
- the base station can detect that at least one UE has sent NACK by detecting the received power in the PUCCH resource (for example, the received power exceeding the threshold value).
- Aspect 3-3 If the UE detects a group common DCI, the UE may transmit a PUCCH based on the aspect 3-2.
- the NW it is more important information whether the UE has failed to detect the group common DCI than whether the UE has detected the group common DCI.
- the problem is how the NW recognizes whether the UE has failed to detect the group common DCI.
- the possible occasion / search space of the group common DCI that indicates the TCI status to a plurality of UEs may be set / instructed by the DCI / upper layer.
- the UE may monitor the possible occasions (monitoring occasions, PDCCH monitoring occasions) / search space of the group common DCI. If the UE successfully detects the group common DCI, the UE does not have to transmit the PUCCH. If the UE cannot successfully detect the group common DCI, the UE may transmit the PUCCH based on the aspect 3-2. Only the UE that fails to detect the group common DCI may transmit the PUCCH, and the base station may recognize that at least one UE has failed to receive the DCI.
- the occasions # 1 and # 2 are possible occasion / search spaces of the group common DCI that indicate the TCI state.
- a UE succeeds in receiving the group common DCI in the occasion # 1 and fails to receive the group common DCI in the occasion # 2, it transmits the PUCCH in the PUCCH resource.
- This PUCCH resource is not indicated by the group common DCI.
- the PUCCH resource may be set by the upper layer or may be determined from the PUCCH resource set before establishing the RRC connection.
- the NW may follow any of the following aspects 3-4-1 and 3-4-2.
- the NW may resend the same group common DCI to all UEs to which the group common DCI is sent.
- the fourth embodiment described later may be applied to all UEs in order to indicate to the UEs that the PUCCH has been normally received.
- the NW may recognize the UE that failed to decode the DCI. After that, the NW may follow at least one of the following operations 1 to 3.
- the same group common DCI for TCI instructions may be retransmitted.
- the initial transmission and retransmission of the group common DCI may have the same HARQ process number (HPN) indication.
- HPN HARQ process number
- the UE that successfully receives the first DCI (first delivery) may not be required to monitor the retransmission of the DCI.
- the monitoring occasion for retransmission may be specified in the specification or may be set by a higher layer.
- the DCI may have a field indicating whether it is the first transmission or the retransmission. In the example of FIG. 15, the UE that normally receives the first DCI may ignore the retransmitted DCI.
- the NW may retransmit the group common DCI with different TCI instructions.
- the retransmission may be a TCI instruction only for the UE that failed to receive the first transmission. It is not necessary to update the TCI status for the UE that succeeded in receiving the first transmission.
- the NW may retransmit the UE-specific DCI only to the UE that has failed to receive the first transmission.
- the UE After the UE transmits the HARQ-ACK information for the group common DCI including the TCI field, the UE receives the response to the HARQ-ACK information and, at a specific time after receiving the response (eg, the last symbol of the response), the UE. May update the TCI assumptions.
- the specific time may be a K symbol. K may be specified in the specification, set by a higher layer, or reported by the UE as a UE capability.
- the response may follow at least one of the following responses 1 and 2.
- the response from the base station may be a DCI with a CRC scrambled by x-RNTI.
- This DCI may be transmitted in an individually set search space / CORESET, or may be transmitted in an arbitrary search space / CORESET.
- x-RNTI may be C-RNTI or is an RNTI (individual RNTI, individually set RNTI) configured for multiple UEs for group based beam indication. There may be.
- the response from the base station may be transmitted by individual physical resources (physical resources set individually).
- the individual physical resources may be similar to the Physical HARQ Indicator Channel (PHICH) in LTE.
- the individual physical resources may be common to the UE.
- the same physical resource may be set for multiple UEs.
- the individual physical resource may be UE-individual (UE-specific). Different physical resources may be set for each UE.
- UE capability corresponding to at least one function (feature) in the first to fourth embodiments may be defined. If the UE reports this UE capability, the UE may perform the corresponding function. If the UE reports this UE capability and the upper layer parameters corresponding to this function are set, the UE may perform the corresponding function. Upper layer parameters (RRC information elements) corresponding to this function may be specified. If this higher layer parameter is set, the UE may perform the corresponding function.
- the UE capability may indicate whether the UE supports this feature.
- the UE can realize at least one of the above functions while maintaining compatibility with existing specifications.
- wireless communication system Wireless communication system
- communication is performed using any one of the wireless communication methods according to each of the above-described embodiments of the present disclosure or a combination thereof.
- FIG. 17 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by Third Generation Partnership Project (3GPP). ..
- the wireless communication system 1 may support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs).
- MR-DC is a dual connectivity (E-UTRA-NR Dual Connectivity (EN-DC)) between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR, and a dual connectivity (NR-E) between NR and LTE.
- E-UTRA-NR Dual Connectivity Evolved Universal Terrestrial Radio Access (E-UTRA)
- NR-E dual connectivity
- NE-DC -UTRA Dual Connectivity
- the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)).
- the base station (gNB) of NR is MN
- the base station (eNB) of LTE (E-UTRA) is SN.
- the wireless communication system 1 has dual connectivity between a plurality of base stations in 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.
- a plurality of base stations in the same RAT for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both MN and SN are NR base stations (gNB). )
- NR-NR Dual Connectivity NR-DC
- gNB NR base stations
- the wireless communication system 1 includes a base station 11 that forms a macrocell C1 having a relatively wide coverage, and a base station 12 (12a-12c) that is arranged in the macrocell C1 and forms a small cell C2 that is narrower than the macrocell C1. You may prepare.
- the user terminal 20 may be located in at least one cell. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure.
- the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.
- the user terminal 20 may be connected to at least one of a plurality of base stations 10.
- the user terminal 20 may use at least one of carrier aggregation (Carrier Aggregation (CA)) and dual connectivity (DC) using a plurality of component carriers (Component Carrier (CC)).
- CA Carrier Aggregation
- DC dual connectivity
- CC Component Carrier
- Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)).
- the macrocell C1 may be included in FR1 and the small cell C2 may be included in FR2.
- FR1 may be in a frequency band of 6 GHz or less (sub 6 GHz (sub-6 GHz)), and FR 2 may be in a frequency band higher than 24 GHz (above-24 GHz).
- the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.
- the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- the plurality of base stations 10 may be connected by wire (for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
- wire for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the higher-level station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to a relay station (relay) is IAB. It may be called a node.
- IAB Integrated Access Backhaul
- relay station relay station
- the base station 10 may be connected to the core network 30 via another base station 10 or directly.
- the core network 30 may include at least one such as Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).
- 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 methods such as LTE, LTE-A, and 5G.
- a wireless access method based on Orthogonal Frequency Division Multiplexing may be used.
- OFDM Orthogonal Frequency Division Multiplexing
- DL Downlink
- UL Uplink
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple. Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the wireless access method may be called a waveform.
- another wireless access system for example, another single carrier transmission system, another multi-carrier transmission system
- the UL and DL wireless access systems may be used as the UL and DL wireless access systems.
- a downlink shared channel Physical Downlink Shared Channel (PDSCH)
- a broadcast channel Physical Broadcast Channel (PBCH)
- a downlink control channel Physical Downlink Control
- PDSCH Physical Downlink Control
- the uplink shared channel Physical Uplink Shared Channel (PUSCH)
- the uplink control channel Physical Uplink Control Channel (PUCCH)
- the random access channel shared by each user terminal 20 are used.
- Physical Random Access Channel (PRACH) Physical Random Access Channel or the like may be used.
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by PDSCH.
- User data, upper layer control information, and the like may be transmitted by the PUSCH.
- the Master Information Block (MIB) may be transmitted by the PBCH.
- Lower layer control information may be transmitted by PDCCH.
- the lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of PDSCH and PUSCH.
- DCI Downlink Control Information
- the DCI that schedules PDSCH may be called DL assignment, DL DCI, or the like, and the DCI that schedules PUSCH may be called UL grant, UL DCI, or the like.
- the PDSCH may be read as DL data, and the PUSCH may be read as UL data.
- a control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may be used for PDCCH detection.
- CORESET corresponds to a resource for searching DCI.
- the search space corresponds to the search area and search method of PDCCH candidates (PDCCH candidates).
- One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a search space 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.
- the "search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. of the present disclosure may be read as each other.
- channel state information (Channel State Information (CSI)
- delivery confirmation information for example, it may be called Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.
- scheduling request for example.
- Uplink Control Information (UCI) including at least one of SR) may be transmitted.
- the PRACH may transmit a random access preamble for establishing a connection with the cell.
- downlinks, uplinks, etc. may be expressed without “links”. Further, it may be expressed without adding "Physical" to the beginning of various channels.
- a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like may be transmitted.
- the DL-RS includes a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a demodulation reference signal (DeModulation).
- CRS Cell-specific Reference Signal
- CSI-RS Channel State Information Reference Signal
- DeModulation Demodulation reference signal
- Reference Signal (DMRS)), positioning reference signal (Positioning Reference Signal (PRS)), phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like may be transmitted.
- PRS Positioning Reference Signal
- PTRS Phase Tracking Reference Signal
- the synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as SS / PBCH block, SS Block (SSB) and the like.
- SS, SSB and the like may also be called a reference signal.
- a measurement reference signal Sounding Reference Signal (SRS)
- a demodulation reference signal DMRS
- UL-RS Uplink Reference Signal
- UE-specific Reference Signal UE-specific Reference Signal
- FIG. 18 is a diagram showing an example of the configuration of the base station according to the embodiment.
- the base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140.
- the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may each be provided with one or more.
- the functional block of the characteristic portion in the present embodiment is mainly shown, 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 part described below may be omitted.
- the control unit 110 controls the entire base station 10.
- the control unit 110 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (for example, resource allocation, mapping) and the like.
- the control unit 110 may control transmission / reception, measurement, and the like 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, and the like, and transfer the data to the transmission / reception unit 120.
- the control unit 110 may perform call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of radio resources, and the like.
- the transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123.
- the baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212.
- the transmitter / receiver 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on the 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 composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122.
- the receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.
- the transmitting / receiving antenna 130 can be composed of an antenna described based on the common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 120 processes, for example, Packet Data Convergence Protocol (PDCP) layer processing and Radio Link Control (RLC) layer processing (for example, RLC) for data, control information, etc. acquired from control unit 110.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control HARQ retransmission control
- the transmission / reception unit 120 performs channel coding (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (Discrete Fourier Transform (DFT)) for the bit string to be transmitted. Processing (if necessary), inverse Fast Fourier Transform (IFFT) processing, precoding, transmission processing such as digital-analog transform may be performed, and the baseband signal may be output.
- channel coding may include error correction coding
- modulation modulation
- mapping mapping, filtering
- DFT discrete Fourier Transform
- IFFT inverse Fast Fourier Transform
- precoding coding
- transmission processing such as digital-analog transform
- the transmission / reception unit 120 may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 130. ..
- the transmission / reception unit 120 may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 130.
- the transmission / reception unit 120 (reception processing unit 1212) performs analog-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) for the acquired baseband signal. )) Processing (if necessary), filtering, decoding, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing are applied. User data and the like may be acquired.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- the transmission / reception unit 120 may perform measurement on the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, or the like based on the received signal.
- the measuring unit 123 has received power (for example, Reference Signal Received Power (RSRP)) and reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)).
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- Signal strength for example, Received Signal Strength Indicator (RSSI)
- propagation path information for example, CSI
- the measurement result may be output to the control unit 110.
- the transmission line interface 140 transmits / receives signals (backhaul signaling) to / from a device included in the core network 30, another base station 10, etc., and user data (user plane data) for the user terminal 20 and a control plane. Data or the like may be acquired or transmitted.
- the transmission unit and the reception unit of the base station 10 in the present disclosure may be composed of at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140.
- the transmission / reception unit 120 may transmit TCI status information indicating a plurality of transmission setting instruction (TCI) states, and may transmit downlink control information common to the group.
- the control unit 110 may apply the TCI state associated with the value of the field in the downlink control information among the plurality of TCI states to at least one signal of the uplink and the downlink.
- the transmission / reception unit 120 may transmit downlink control information common to the group, which indicates the transmission setting instruction (TCI) status.
- the control unit 110 may control the reception of feedback information indicating success or failure of reception of the downlink control information.
- FIG. 19 is a diagram showing an example of the configuration of a user terminal according to an embodiment.
- the user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230.
- the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided with one or more.
- the functional block of the feature portion in the present embodiment is mainly shown, 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 part described below may be omitted.
- the control unit 210 controls the entire user terminal 20.
- the control unit 210 can be composed of a controller, a control circuit, and the like described based on the 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, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230.
- the control unit 210 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 220.
- the transmission / reception unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223.
- the baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212.
- the transmitter / receiver 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on the 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 composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222.
- the receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.
- the transmitting / receiving antenna 230 can be composed of an antenna described based on the common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 220 processes, for example, PDCP layer processing, RLC layer processing (for example, RLC retransmission control), and MAC layer processing (for example, for data, control information, etc. acquired from the control unit 210). , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- the transmission / reception unit 220 (transmission processing unit 2211) performs channel coding (may include error correction coding), modulation, mapping, filtering processing, DFT processing (if necessary), and IFFT processing for the bit string to be transmitted. , Precoding, digital-to-analog conversion, and other transmission processing may be performed to output a baseband signal.
- Whether or not to apply the DFT process may be based on the transform precoding setting.
- the transmission / reception unit 220 transmits the channel using the DFT-s-OFDM waveform.
- the DFT process may be performed as the transmission process, and if not, the DFT process may not be performed as the transmission process.
- the transmission / reception unit 220 may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 230. ..
- the transmission / reception unit 220 may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 230.
- the transmission / reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, and decoding (error correction) for the acquired baseband signal. Decoding may be included), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmission / reception unit 220 may perform measurement on the received signal.
- the measuring unit 223 may perform RRM measurement, CSI measurement, or the like based on the received signal.
- the measuring unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like.
- the measurement result may be output to the control unit 210.
- the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.
- the transmission / reception unit 220 may receive TCI status information indicating a plurality of transmission setting instruction (TCI) states, and may receive downlink control information common to the group.
- the control unit 210 may apply the TCI state associated with the value of the field in the downlink control information to at least one signal of the uplink and the downlink among the plurality of TCI states.
- the control unit 210 may apply the TCI state to the signal after a lapse of a specific time from the transmission of the feedback information indicating the success or failure of the reception of the downlink control information.
- the TCI status information may be unique to the terminal.
- the TCI status information may be common to a plurality of terminals.
- the transmission / reception unit 220 may receive downlink control information common to the group, which indicates the transmission setting instruction (TCI) status.
- the control unit 210 may control the transmission of feedback information indicating success or failure in receiving the downlink control information.
- the transmission / reception unit 220 may receive resource information indicating a plurality of resources of the feedback information.
- the control unit 210 may use the resource associated with the value of the field in the downlink control information among the plurality of resources for the transmission.
- the transmission / reception unit 220 may receive monitoring information indicating a monitoring occasion for the downlink control information.
- the control unit 210 may control the transmission of the feedback information indicating the failure to receive the downlink control information.
- the transmission / reception unit 220 may receive the retransmission of the downlink control information transmitted based on the feedback information or the response transmitted based on the feedback information.
- each functional block is realized using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , Wired, wireless, etc.) and may be realized using these plurality of devices.
- the functional block may be realized by combining the software with the one device or the plurality of devices.
- the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (configuration unit) for functioning transmission may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like.
- the realization method is not particularly limited.
- the base station, user terminal, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure.
- FIG. 20 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- the base station 10 and the 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 the devices shown in the figure, or may be configured not to include some of the devices.
- processor 1001 may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by two or more processors.
- the processor 1001 may be mounted by one or more chips.
- the processor 1001 For each function in the base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation and communicates via the communication device 1004. It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.
- predetermined software program
- the processor 1001 operates, for example, an operating system to control 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 unit, a register, and the like.
- CPU central processing unit
- control unit 110 210
- transmission / reception unit 120 220
- the like may be realized by the processor 1001.
- the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
- a program program code
- the control unit 110 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks.
- the memory 1002 is a computer-readable recording medium, for example, at least a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), or any other suitable storage medium. It may be composed of one.
- the memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, and is, for example, a flexible disk, a floppy disk (registered trademark) disk, a magneto-optical disk (for example, a compact disc (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, etc.). At least one of Blu-ray® disks, removable disks, optical disc drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers, and other suitable storage media. May be configured by.
- the storage 1003 may be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 has, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)). May be configured to include.
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- the transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), and the like described above may be realized by the communication device 1004.
- the transmission / reception unit 120 (220) may be physically or logically separated by the transmission unit 120a (220a) and the reception unit 120b (220b).
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an 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.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information.
- the bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like. It may be configured to include hardware, and a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.
- DSP Digital Signal Processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- the terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings.
- channels, symbols and signals may be read interchangeably.
- the signal may be a message.
- the reference signal may be abbreviated as RS, and may be referred to as a pilot, a pilot signal, or the like depending on the applied standard.
- the component carrier CC may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.
- the wireless frame may be configured by one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe.
- the subframe may be composed of one or more slots in the time domain.
- the subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.
- the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel.
- Numerology includes, for example, subcarrier spacing (SubCarrier Spacing (SCS)), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval (TTI)), number of symbols per TTI, and wireless frame configuration.
- SCS subcarrier Spacing
- TTI Transmission Time Interval
- a specific filtering process performed by the transmitter / receiver in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.
- the slot may be composed of one or more symbols in the time area (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.). Further, the slot may be a time unit based on numerology.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the slot may include a plurality of mini slots. Each minislot may be composed of one or more symbols in the time domain. Further, the mini slot may be referred to as a sub slot. The minislot may consist of a smaller number of symbols than the slot.
- the PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (PUSCH) mapping type A.
- the PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (PUSCH) mapping type B.
- the wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal.
- the radio frame, subframe, slot, minislot and symbol may use different names corresponding to each.
- the time units such as frames, subframes, slots, mini slots, and symbols in the present disclosure may be read as each other.
- one subframe may be called TTI
- a plurality of consecutive subframes may be called TTI
- one slot or one minislot may be called 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.
- the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
- the base station schedules each user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units.
- the definition of TTI is not limited to this.
- TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
- the time interval for example, the number of symbols
- the transport block, code block, code word, etc. may be shorter than the TTI.
- one or more TTIs may be the minimum time unit for scheduling. Further, the number of slots (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 referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
- TTI shorter than normal TTI may be referred to as shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, minislot, subslot, slot and the like.
- the long TTI (eg, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms
- the short TTI eg, shortened TTI, etc.
- TTI having the above TTI length may be read as TTI having the above TTI length.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
- the number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12.
- the number of subcarriers contained in the RB may be determined based on numerology.
- the RB may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe or 1 TTI.
- Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
- one or more RBs are a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, and an RB. It may be called a pair or the like.
- PRB Physical RB
- SCG sub-carrier Group
- REG resource element group
- PRB pair an RB. It may be called a pair or the like.
- the resource block may be composed of one or a plurality of resource elements (Resource Element (RE)).
- RE Resource Element
- 1RE may be a radio resource area of 1 subcarrier and 1 symbol.
- Bandwidth Part (which may also be called partial bandwidth) represents a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. May be good.
- the common RB may be specified by the index of the RB with respect to the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- the BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP UL BWP
- BWP for DL DL BWP
- One or more BWPs may be set in one carrier for the UE.
- At least one of the configured BWPs may be active and the UE may not expect to send or receive a given signal / channel outside the active BWP.
- “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
- the above-mentioned structures such as wireless frames, subframes, slots, mini-slots and symbols are merely examples.
- the number of subframes contained in a radio frame the number of slots per subframe or radioframe, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB.
- the number of subcarriers, the number of symbols in TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.
- the information, parameters, etc. described in the present disclosure may be expressed using an absolute value, a relative value from a predetermined value, or another corresponding information. It may be represented.
- the radio resource may be indicated by a given index.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
- information, signals, etc. can be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layers.
- Information, signals, etc. may be input / output via a plurality of 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 / output information, signals, etc. can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.
- the notification of information is not limited to the embodiment / embodiment described in the present disclosure, and may be performed by using another method.
- the notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (DCI)), uplink control information (Uplink Control Information (UCI))), and higher layer signaling (for example, Radio Resource Control). (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals or combinations thereof. May be carried out by.
- DCI downlink control information
- UCI Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like.
- the RRC signaling may be referred to as 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 (MAC Control Element (CE)).
- CE MAC Control Element
- the notification of predetermined information is not limited to the explicit notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).
- the determination may be made by a value represented by 1 bit (0 or 1), or by a boolean value represented by true or false. , May be done by numerical comparison (eg, comparison with a given value).
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- the software uses at least one of wired technology (coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) on the website.
- wired technology coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL), etc.
- wireless technology infrared, microwave, etc.
- the terms “system” and “network” used in this disclosure may be used interchangeably.
- the “network” may mean a device (eg, a base station) included in the network.
- precoding "precoding weight”
- QCL Quality of Co-Co-Location
- TCI state Transmission Configuration Indication state
- space "Spatial relation”, “spatial domain filter”, “transmission power”, “phase rotation”, "antenna port”, “antenna port group”, “layer”, “number of layers”
- Terms such as “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, "antenna”, “antenna element", “panel” are compatible.
- base station BS
- wireless base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission point (Transmission Point (TP))
- Reception point Reception Point
- TRP Transmission / Reception Point
- Panel , "Cell”, “sector”, “cell group”, “carrier”, “component carrier” and the like
- Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
- the base station can accommodate one or more (eg, 3) cells.
- a base station accommodates multiple cells, the entire base station coverage area can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio). Communication services can also be provided by Head (RRH))).
- RRH Head
- the term "cell” or “sector” refers to part or all of the coverage area of at least one of a base station and a base station subsystem that provides communication services in this coverage.
- MS mobile station
- UE user equipment
- terminal terminal
- 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. , Handset, user agent, mobile client, 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 the mobile body, a mobile body itself, or the like.
- the moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be.
- at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
- at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read by the user terminal.
- the communication between the base station and the user terminal is replaced with the communication between a plurality of user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- D2D Device-to-Device
- V2X Vehicle-to-Everything
- Each aspect / embodiment of the present disclosure may be applied to the configuration.
- the user terminal 20 may have the function of the base station 10 described above.
- words such as "up” and “down” may be read as words corresponding to communication between terminals (for example, "side”).
- the upstream channel, the downstream channel, and the like may be read as a side channel.
- the user terminal in the present disclosure may be read as a base station.
- the base station 10 may have the functions of the user terminal 20 described above.
- the operation performed by the base station may be performed by its upper node (upper node) in some cases.
- various operations performed for communication with a terminal are a base station, one or more network nodes other than the base station (for example,).
- Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. can be considered, but it is not limited to these), or it is clear that it can be performed by a combination thereof.
- Each aspect / embodiment described in the present disclosure may be used alone, in combination, or may be switched and used according to the execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- 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 fraction)
- 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
- UMB Ultra Mobile Broadband
- LTE 802.11 Wi-Fi®
- LTE 802.16 WiMAX®
- LTE 802.20 Ultra-WideBand (UWB), Bluetooth®, and other suitable radios.
- UMB Ultra Mobile Broadband
- references to elements using designations such as “first” and “second” as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.
- determining used in this disclosure may include a wide variety of actions.
- judgment (decision) means judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry) ( For example, searching in a table, database or another data structure), ascertaining, etc. may be considered to be "judgment”.
- judgment (decision) includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access (for example). It may be regarded as “determining” such as accessing) (for example, accessing data in memory).
- judgment (decision) is regarded as “judgment (decision)” such as resolution, selection, selection, establishment, and comparison. May be good. That is, “judgment (decision)” may be regarded as “judgment (decision)” of some action.
- the "maximum transmission power" described in the present disclosure may mean the maximum value of the transmission power, may mean the nominal UE maximum transmit power, or may mean the rated maximum transmission power (the). It may mean rated UE maximum transmit power).
- connection are any direct or indirect connections or connections between two or more elements. Means, and can include the presence of one or more intermediate elements between two elements that are “connected” or “bonded” to each other.
- the connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection” may be read as "access”.
- the radio frequency domain microwaves. It can be considered to be “connected” or “coupled” to each other using frequency, electromagnetic energy having wavelengths in the region, light (both visible and invisible) regions, and the like.
- the term "A and B are different” may mean “A and B are different from each other”.
- the term may mean that "A and B are different from C”.
- Terms such as “separate” and “combined” may be interpreted in the same way 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。
PUSCH、PUCCH、SRSのそれぞれの送信電力制御におけるパスロスPLb,f,c(qd)[dB]は、サービングセルcのキャリアfのアクティブUL BWP bに関連付けられる下りBWP用の参照信号(RS、パスロス参照RS(PathlossReferenceRS))のインデックスqdを用いてUEによって計算される。本開示において、パスロス参照RS、pathloss(PL)-RS、インデックスqd、パスロス計算に用いられるRS、パスロス計算に用いられるRSリソース、は互いに読み替えられてもよい。本開示において、計算、推定、測定、追跡(track)、は互いに読み替えられてもよい。
RRC接続モードにおいて、DCI内TCI情報(上位レイヤパラメータTCI-PresentInDCI)が「有効(enabled)」とセットされる場合と、DCI内TCI情報が設定されない場合と、の両方において、DL DCI(PDSCHをスケジュールするDCI)の受信と、対応するPDSCH(当該DCIによってスケジュールされるPDSCH)と、の間の時間オフセットが、閾値(timeDurationForQCL)より小さい場合(適用条件、第1条件)、もし非クロスキャリアスケジューリングの場合、PDSCHのTCI状態(デフォルトTCI状態)は、その(特定UL信号の)CCのアクティブDL BWP内の最新のスロット内の最低のCORESET IDのTCI状態であってもよい。そうでない場合、PDSCHのTCI状態(デフォルトTCI状態)は、スケジュールされるCCのアクティブDL BWP内のPDSCHの最低のTCI状態IDのTCI状態であってもよい。
NRでは、1つ又は複数の送受信ポイント(Transmission/Reception Point(TRP))(マルチTRP(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。
統一TCIフレームワークによれば、UL及びDLのチャネルを共通のフレームワークによって制御できる。統一TCIフレームワークは、Rel.15のようにTCI状態又は空間関係をチャネル毎に規定するのではなく、共通ビームを指示し、それをUL及びDLの全てのチャネルへ適用してもよいし、UL用の共通ビームをULの全てのチャネルに適用し、DL用の共通ビームをDLの全てのチャネルに適用してもよい。
UEは、最大許容曝露(Maximum Permitted Exposure(MPE))に起因する異なるULビームを用いる。
UEは、UL信号強度に起因する異なるULビームを用いる。
UEは、ULロードバランスに起因する異なるULビームを用いる。
[PDCCH送信1]
共通ビームの更新。
[PDCCH送信2]
PDSCHのスケジューリング。
UEは、複数のチャネル/RSに適用可能な複数のTCI状態(プール)をRRC情報要素(TCI状態情報)によって設定されてもよい。UEは、UL及びDLの両方用のTCI状態プール(ジョイントTCI状態プール)を設定されてもよいし、UL用TCI状態プール及びDL用TCI状態プール(セパレートTCI状態プール)を設定されてもよい。TCI状態プール内の複数のTCI状態がMAC CE(TCI状態情報)によってアクティベートされてもよい。DCIは、設定/アクティベートされた複数のTCI状態のうち、DCIによって指示された1つのTCI状態を、UL/DLの1以上のチャネル/RS(信号)に適用してもよい。
グループ共通(common)PDCCHが、1以上のUEに対して共通TCI状態の中のTCI状態を指示してもよい。
[設定1]
UE固有(UE-specific)。複数のUEに対してTCIフィールドの同じ値が、異なるTCI状態を指示してもよい。複数のUEのそれぞれに対して、UE固有の複数のTCI状態(リスト)が設定されてもよい。複数のTCI状態はTCIフィールドの複数の値にそれぞれマップされてもよい。各UEは、設定された複数のTCI状態のうち、TCIフィールドの値に対応するTCI状態を特定のチャネル/RSの送信/受信に用いてもよい。
[設定2]
UE共通。複数のUEに対してTCIフィールドの同じ値が、同じTCI状態を指示してもよい。複数のUEのそれぞれに対して、共通の複数のTCI状態(リスト)が設定されてもよい。複数のTCI状態はTCIフィールドの複数の値にそれぞれマップされてもよい。各UEは、設定された複数のTCI状態のうち、設定された複数のTCI状態のうち、TCIフィールドの値に対応するTCI状態を特定のチャネル/RSの送信/受信に用いてもよい。
幾つかのUEがグループ共通DCIの受信を失敗する可能性がある。この場合、複数のUEの間/UE及び基地局の間において、TCI想定のずれ(齟齬、miss-alignment)が生じる。
グループ共通DCIが、PUCCH resource indicator(PRI)フィールド及びHARQタイミングインジケータフィールドの少なくとも1つのフィールドを有する場合、PUCCHリソース及びスロットは、そのフィールドによって決定されてもよい。
グループ共通DCIが、PRIフィールドを有しない場合、PUCCHリソースは、RRC接続確立前(個別PUCCHリソースが提供されない場合)のPUCCHリソースセット及びPUCCHリソースの決定方法によって決定されてもよい。この決定方法において、UEは、システム情報(SIB1)によって提供されるパラメータに基づいてPUCCHリソースセットを決定し、PDCCH(PRIフィールド/最初のcontrol channel element(CCE)インデックス)に基づいて当該PUCCHリソースセットからPUCCHリソースを決定する。
TCI指示を有するグループ共通PDCCHに対するHARQリソースは、次の態様3-1から3-4の少なくとも1つに従ってもよい。
態様3-1は、次の態様3-1-1及び3-1-2の少なくとも1つに従ってもよい。
PRI/HARQタイミングインジケータは、複数のUEに対する複数のフィールドを有してもよい。
PRI/HARQタイミングインジケータは、複数のUEに用いられる1つのフィールドを有してもよい。
態様3-2は、次の態様3-2-1及び3-2-2の少なくとも1つに従ってもよい。
もしTCI指示を有するグループ共通DCIが検出された場合、UEは、PUCCHリソースにおいてHARQ-ACK情報を送信してもよい。複数のUEは、同じPUCCHリソースを共有してもよい。複数のUEのそれぞれに対して、共通の複数のPUCCHリソース(リスト)が設定されてもよい。複数のPUCCHリソースはPRIフィールドの複数の値にそれぞれマップされてもよい。各UEは、設定された複数のPUCCHリソースのうち、PRIフィールドの値に対応するPUCCHリソースをHARQ-ACK情報の送信に用いてもよい。
もしUEがグループ共通DCIを検出した場合、UEは、態様3-2に基づいてPUCCHを送信してもよい。
NWが、異なるUEからのPUCCHフィードバックを区別できるか、NWが、ビーム更新のためのグループ共通DCIをどのように再送するか、が問題となる。
もしNWが、異なるUEからの、NACKを有するPUCCHフィードバックを区別できない場合、NWは、グループ共通DCIの送信先の全てのUEに対して、同じグループ共通DCIを再送してもよい。この場合、全てのUEに対して、PUCCHを正常に受信できたことをUEに示すために、後述の第4の実施形態が適用されてもよい。
もしNWが、異なるUEからの、NACKを有するPUCCHフィードバックを区別できる場合、NWは、DCIの復号に失敗したUEを認識してもよい。その後、NWは、次の動作1から3の少なくとも1つに従ってもよい。
TCI指示用の同じグループ共通DCIを再送してもよい。例えば、ソフトコンバイニングをサポートするために、グループ共通DCIの初送及び再送は、同じHARQプロセス番号(HPN)指示を有してもよい。1番目のDCI(初送)を正常に受信したUEは、DCIの再送をモニタすることを必要とされなくてもよい。再送用のモニタリングオケージョンは、仕様に規定されていてもよいし、上位レイヤによって設定されてもよい。DCIは、初送であるか再送であるかを示すフィールドを有していてもよい。図15の例において、1番目のDCIを正常に受信したUEは、再送されたDCIを無視してもよい。
NWは、異なるTCI指示を有するグループ共通DCIを再送してもよい。例えば、再送は、初送の受信に失敗したUEのみに対するTCI指示であってもよい。初送の受信に成功したUEに対してTCI状態の更新がなくてもよい。
NWは、初送の受信に失敗したUEのみに対して、UE固有DCIを再送してもよい。
UEがTCIフィールドを含むグループ共通DCIに対するHARQ-ACK情報を送信した後、UEは、HARQ-ACK情報に対する応答を受信し、応答の受信(例えば、応答の最終シンボル)から特定時間後において、UEは、TCI想定を更新してもよい。図16の例のように、特定時間は、Kシンボルであってもよい。Kは、仕様に規定されてもよいし、上位レイヤによって設定されてもよいし、UEによってUE能力として報告されてもよい。応答は、次の応答1及び2の少なくとも1つに従ってもよい。
基地局からの応答は、x-RNTIによってスクランブルされたCRCを有するDCIであってもよい。このDCIは、個別に設定されたサーチスペース/CORESETにおいて送信されてもよいし、任意のサーチスペース/CORESETにおいて送信されてもよい。x-RNTIは、C-RNTIであってもよいし、グループに基づくビーム指示(group based beam indication)用に複数のUEに対して設定されるRNTI(個別RNTI、個別に設定されるRNTI)であってもよい。
基地局からの応答は、個別物理リソース(個別に設定される物理リソース)によって送信されてもよい。個別物理リソースは、LTEにおけるPhysical HARQ Indicator Channel(PHICH)と同様であってもよい。個別物理リソースは、UE共通であってもよい。複数のUEに対して同じ物理リソースが設定されてもよい。個別物理リソースは、UE個別(UE固有)であってもよい。各UEに対して異なる物理リソースが設定されてもよい。
第1から第4の実施形態における少なくとも1つの機能(特徴、feature)に対応するUE能力(capability)が規定されてもよい。UEがこのUE能力を報告した場合、UEは、対応する機能を行ってもよい。UEがこのUE能力を報告し、且つこの機能に対応する上位レイヤパラメータを設定された場合、UEは、対応する機能を行ってもよい。この機能に対応する上位レイヤパラメータ(RRC情報要素)が規定されてもよい。この上位レイヤパラメータが設定された場合、UEは、対応する機能を行ってもよい。
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18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19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)
- 送信設定指示(TCI)状態を示す、グループ共通の下りリンク制御情報を受信する受信部と、
前記下りリンク制御情報の受信の成功又は失敗を示すフィードバック情報の送信を制御する制御部と、を有する端末。 - 前記受信部は、前記フィードバック情報の複数のリソースを示すリソース情報を受信し、
前記制御部は、前記複数のリソースのうち、前記下りリンク制御情報内のフィールドの値に関連付けられたリソースを前記送信に用いる、請求項1に記載の端末。 - 前記受信部は、前記下りリンク制御情報用のモニタリングオケージョンを示すモニタリング情報を受信し、
前記モニタリングオケージョンにおいて前記下りリンク制御情報の受信が失敗した場合、前記制御部は、前記下りリンク制御情報の受信の失敗を示す前記フィードバック情報の送信を制御する、請求項1又は請求項2に記載の端末。 - 前記受信部は、前記フィードバック情報に基づいて送信される前記下りリンク制御情報の再送、又は、前記フィードバック情報に基づいて送信される応答、を受信する、請求項1から請求項3のいずれかに記載の端末。
- 送信設定指示(TCI)状態を示す、グループ共通の下りリンク制御情報を受信するステップと、
前記下りリンク制御情報の受信の成功又は失敗を示すフィードバック情報の送信を制御するステップと、を有する、端末の無線通信方法。 - 送信設定指示(TCI)状態を示す、グループ共通の下りリンク制御情報を送信する送信部と、
前記下りリンク制御情報の受信の成功又は失敗を示すフィードバック情報の受信を制御する制御部と、を有する基地局。
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