WO2022230141A1 - 端末、無線通信方法及び基地局 - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
- H04B7/06952—Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping
- H04B7/06964—Re-selection of one or more beams after beam failure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Definitions
- the present disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- 3GPP Rel. 10-14 LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).
- LTE successor systems for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later
- 5G 5th generation mobile communication system
- 5G+ 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- BFD beam failure detection
- BFR beam failure recovery
- one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately perform at least one of BFD and BFR.
- a terminal includes at least one of setting 0 or more beam failure detection reference signal (BFD-RS) sets and determining 0 or more BFD-RS sets, and 0 or more new beam identification references
- BFD-RS beam failure detection reference signal
- a control unit that assumes at least one of setting a signal (NBI-RS) set and determining 0 or more NBI-RS sets, and one or more included in the BFD-RS set determined based on the assumption and a receiving unit that receives at least one of the BFD-RS of the NBI-RS set and one or more NBI-RSs included in the NBI-RS set.
- BFD-RS beam failure detection reference signal
- At least one of BFD and BFR can be performed appropriately.
- FIG. 1 is a diagram showing an example of the number of RLM-RSs.
- FIG. 2 is a diagram showing an example of a beam recovery procedure.
- FIG. 3 is a diagram showing an example of combinations of the total number of BFD-RS sets and the total number of NBI-RS sets.
- FIG. 4 is a diagram showing an example of the number of BFD-RS sets and the number of NBI-RS sets according to the third embodiment.
- FIG. 5 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment.
- FIG. 6 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- FIG. 7 is a diagram illustrating an example of the configuration of a user terminal according to one embodiment.
- FIG. 8 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to one embodiment.
- the reception processing e.g., reception, demapping, demodulation, decoding
- transmission processing e.g, at least one of transmission, mapping, precoding, modulation, encoding
- the TCI state may represent those that apply to downlink signals/channels.
- the equivalent of TCI conditions applied to uplink signals/channels may be expressed as spatial relations.
- the TCI state is information about the pseudo-colocation (QCL) of signals/channels, and may be called spatial reception parameters, spatial relation information, or the like.
- the TCI state may be set in the UE on a channel-by-channel or signal-by-signal basis.
- QCL is an index that indicates the statistical properties of a signal/channel. For example, when one signal/channel and another signal/channel have a QCL relationship, Doppler shift, Doppler spread, average delay ), delay spread, spatial parameters (e.g., spatial Rx parameter) are identical (QCL with respect to at least one of these). You may
- the spatial reception parameters may correspond to the reception beams of the UE (eg, reception analog beams), and the beams may be specified based on the spatial QCL.
- QCL or at least one element of QCL in the present disclosure may be read as sQCL (spatial QCL).
- QCL types may be defined for the QCL.
- QCL types AD may be provided with different parameters (or parameter sets) that can be assumed to be the same, and the parameters (which may be called QCL parameters) are shown below: QCL type A (QCL-A): Doppler shift, Doppler spread, mean delay and delay spread, QCL type B (QCL-B): Doppler shift and Doppler spread, QCL type C (QCL-C): Doppler shift and mean delay; • QCL Type D (QCL-D): Spatial reception parameters.
- CORESET Control Resource Set
- QCL QCL type D
- a UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal/channel based on the TCI conditions or QCL assumptions of that signal/channel.
- Tx beam transmit beam
- Rx beam receive beam
- the TCI state may be, for example, information about the QCL between the channel of interest (in other words, the reference signal (RS) for the channel) and another signal (for example, another RS). .
- the TCI state may be set (indicated) by higher layer signaling, physical layer signaling or a combination thereof.
- Physical layer signaling may be, for example, downlink control information (DCI).
- DCI downlink control information
- Channels for which TCI states or spatial relationships are set are, for example, Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), Physical Uplink Shared Channel It may be at least one of a channel (PUSCH)) and an uplink control channel (Physical Uplink Control Channel (PUCCH)).
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Uplink Control Channel
- RSs that have a QCL relationship with the channel are, for example, a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a measurement reference signal (Sounding It may be at least one of a reference signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).
- SSB synchronization signal block
- CSI-RS channel state information reference signal
- Sounding It may be at least one of a reference signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).
- SRS reference signal
- TRS tracking reference signal
- QRS QCL detection reference signal
- An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- PBCH Physical Broadcast Channel
- An SSB may also be called an SS/PBCH block.
- a QCL type X RS in a TCI state may mean an RS that has a QCL type X relationship with (the DMRS of) a certain channel/signal, and this RS is called a QCL type X QCL source in that TCI state.
- QCL type A RS is always set for PDCCH and PDSCH, and QCL type D RS may be additionally set. Since it is difficult to estimate Doppler shift, delay, etc. by receiving DMRS one-shot, QCL type A RS is used to improve channel estimation accuracy. QCL type D RS is used for receive beam determination during DMRS reception.
- TRS 1-1, 1-2, 1-3, 1-4 are transmitted, and TRS 1-1 is notified as QCL type C/D RS depending on the TCI status of PDSCH.
- the UE can use the information obtained from the past periodic TRS1-1 reception/measurement results for PDSCH DMRS reception/channel estimation.
- the PDSCH QCL source is TRS1-1 and the QCL target is the PDSCH DMRS.
- Multi-TRP In NR, one or more transmission/reception points (Transmission/Reception Points (TRP)) (multi TRP (multi TRP (MTRP))) uses one or more panels (multi-panel) to the UE DL transmission is under consideration. It is also being considered that the UE uses one or more panels to perform UL transmissions for one or more TRPs.
- TRP Transmission/Reception Points
- MTRP multi TRP
- a plurality of TRPs may correspond to the same cell identifier (cell identifier (ID)) or may correspond to different cell IDs.
- the cell ID may be a physical cell ID or a virtual cell ID.
- Multi-TRPs may be connected by ideal/non-ideal backhauls to exchange information, data, and the like.
- Different codewords (CW) and different layers may be transmitted from each TRP of the multi-TRP.
- Non-Coherent Joint Transmission NCJT may be used as one form of multi-TRP transmission.
- TRP#1 modulate-maps a first codeword and layer-maps a first number of layers (e.g., two layers) with a first precoding to transmit a first PDSCH.
- TRP#2 also modulates and layer-maps a second codeword to transmit a second PDSCH with a second number of layers (eg, 2 layers) with a second precoding.
- multiple PDSCHs to be NCJTed may be defined as partially or completely overlapping in at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap at least one of time and frequency resources.
- first PDSCH and second PDSCH are not quasi-co-located (QCL).
- Reception of multiple PDSCHs may be translated as simultaneous reception of PDSCHs that are not of a certain QCL type (eg, QCL type D).
- Multiple PDSCHs from multiple TRPs may be scheduled using one DCI (single DCI, single PDCCH) (single master mode, based on single DCI Multi-TRP (single-DCI based multi-TRP)).
- Multiple PDSCHs from multi-TRP may be scheduled using multiple DCIs (multi-DCI, multiple PDCCH) (multi-master mode, multi-DCI based multi-TRP (multiple PDCCH)). TRP)).
- PDSCH transport block (TB) or codeword (CW) repetition across multi-TRPs.
- repetition schemes URLLC schemes, eg schemes 1, 2a, 2b, 3, 4
- SDM space division multiplexed
- FDM frequency division multiplexed
- RV redundancy version
- the RVs may be the same or different for the multi-TRPs.
- multiple PDSCHs from multiple TRPs are time division multiplexed (TDM).
- TDM time division multiplexed
- multiple PDSCHs from multiple TRPs are transmitted within one slot.
- multiple PDSCHs from multiple TRPs are transmitted in different slots.
- one control resource set (CORESET) in PDCCH configuration information (PDCCH-Config) may correspond to one TRP.
- the UE may determine multi-TRP based on multi-DCI if at least one of the following conditions 1 and 2 is met: In this case, TRP may be read as a CORESET pool index.
- TRP may be read as a CORESET pool index.
- a CORESET pool index of 1 is set.
- Two different values (eg, 0 and 1) of the CORESET pool index are set.
- the UE may determine multi-TRP based on single DCI if the following conditions are met: In this case, two TRPs may be translated into two TCI states indicated by MAC CE/DCI. [conditions] "Enhanced TCI States Activation/Deactivation for UE- specific PDSCH MAC CE)” is used.
- DCI for common beam indication may be a UE-specific DCI format (e.g., DL DCI format (e.g., 1_1, 1_2), UL DCI format (e.g., 0_1, 0_2)), or a UE group common (UE-group common) DCI format.
- DL DCI format e.g., 1_1, 1_2
- UL DCI format e.g., 0_1, 0_2
- UE group common UE-group common
- Radio Link Monitoring In NR, Radio Link Monitoring (RLM) is utilized.
- the network may set the radio link monitoring reference signal (Radio Link Monitoring RS (RLM-RS)) for each BWP to the UE using higher layer signaling.
- RLM Radio Link Monitoring RS
- the UE may receive configuration information for RLM (eg, RRC "RadioLinkMonitoringConfig" information element).
- the configuration information for the RLM may include failure detection resource configuration information (for example, "failureDetectionResourcesToAddModList” of the upper layer parameter).
- the failure detection resource configuration information may include parameters related to RLM-RS (for example, "RadioLinkMonitoringRS" of higher layer parameters).
- Parameters related to RLM-RS information indicating that it corresponds to the purpose of RLM, an index corresponding to the resource of RLM-RS (for example, the index included in the upper layer parameter "failureDetectionResources" (RadioLinkMonitoringRS in failureDetectionResourcesToAddModList)) ), etc.
- the index may be, for example, a CSI-RS resource configuration index (eg, non-zero power CSI-RS resource ID) or an SS/PBCH block index (SSB index).
- the information of interest may indicate beam failure, (cell level) Radio Link Failure (RLF), or both.
- the UE may identify the RLM-RS resource based on the index corresponding to the RLM-RS resource and perform RLM using the RLM-RS resource.
- the UE follows the implicit RLM-RS decision procedure below.
- the UE uses that RS provided for the active TCI state for PDCCH reception in RLM.
- the active TCI state for PDCCH reception includes two RSs, the UE assumes one RS has QCL type D, and the UE uses that RS with QCL type D for RLM. The UE does not assume that both RSs have QCL type D.
- the UE is not required to use aperiodic or semi-persistent RSs for RLM.
- L max 4
- the UE is provided N Select RLM RSs. If more than one CORESET is associated with multiple search space sets with the same monitoring period, the UE determines the order of CORESETs from the highest CORESET index.
- L max is the maximum number of SS/PBCH block indices in the cell.
- the maximum number of SS/PBCH blocks transmitted in a half-frame is L max .
- BFD Beam Failure Detection
- BFR Beam Failure Recovery
- the UE and the base station e.g., gNB (gNodeB)
- the beam used for signal transmission transmission beam, Tx beam, etc.
- the beam used for signal reception reception beam, Rx beam, etc.
- Radio link failure may occur frequently due to deterioration of radio link quality. Since the occurrence of RLF requires cell reconnection, frequent occurrence of RLF causes degradation of system throughput.
- BFR beam recovery
- BFR beam failure recovery
- L1/L2 Layer 1/Layer 2
- a beam failure (BF) in the present disclosure may also be called a link failure.
- Fig. 2 shows Rel. 15 A diagram showing an example of a beam recovery procedure in NR.
- the number of beams, etc. is an example, and is not limited to this.
- the UE performs measurements based on reference signal (RS) resources transmitted using two beams.
- RS reference signal
- the RS may be at least one of a synchronization signal block (SSB) and a channel state measurement RS (Channel State Information RS (CSI-RS)).
- SSB may also be called an SS/PBCH (Physical Broadcast Channel) block.
- PBCH Physical Broadcast Channel
- RS is a primary synchronization signal (Primary SS (PSS)), a secondary synchronization signal (Secondary SS (SSS)), a mobility reference signal (Mobility RS (MRS)), a signal included in SSB, SSB, CSI-RS, for demodulation At least one of a reference signal (DeModulation Reference Signal (DMRS)), a beam-specific signal, etc., or a signal configured by extending or modifying these may be used.
- the RS measured in step S101 is an RS for beam failure detection (Beam Failure Detection RS (BFD-RS), an RS for beam failure detection), an RS (BFR-RS) for use in a beam recovery procedure, or the like.
- BFD-RS Beam Failure Detection RS
- BFR-RS RS for use in a beam recovery procedure, or the like.
- step S102 the UE cannot detect the BFD-RS (or the reception quality of the RS deteriorates) due to the radio waves from the base station being jammed.
- Such disturbances can be caused, for example, by effects such as obstacles, fading, and interference between the UE and the base station.
- the UE detects a beam failure when a predetermined condition is met.
- the UE may detect the occurrence of a beam failure, for example, when BLER (Block Error Rate) is less than a threshold for all configured BFD-RSs (BFD-RS resource configuration).
- BLER Block Error Rate
- BFD-RS resource configuration a threshold for all configured BFD-RSs
- the lower layer (physical (PHY) layer) of the UE may notify (indicate) the beam failure instance to the upper layer (MAC layer).
- the criteria for determination are not limited to BLER, and may be the reference signal received power (Layer 1 Reference Signal Received Power (L1-RSRP)) in the physical layer.
- L1-RSRP Layer 1 Reference Signal Received Power
- beam failure detection may be performed based on a physical downlink control channel (PDCCH) or the like.
- BFD-RS may be expected to be Quasi-Co-Location (QCL) with the DMRS of the PDCCH monitored by the UE.
- QCL is an index that indicates the statistical properties of a channel. For example, if one signal/channel and another signal/channel have a QCL relationship, between these different signals/channels, Doppler shift, Doppler spread, average delay ), delay spread, spatial parameter (e.g., spatial Rx Parameter) are the same (QCL with respect to at least one of these). You may
- the spatial reception parameters may correspond to the reception beams of the UE (eg, reception analog beams), and the beams may be specified based on the spatial QCL.
- QCL or at least one element of QCL in the present disclosure may be read as sQCL (spatial QCL).
- Information on BFD-RS eg, RS index, resource, number, number of ports, precoding, etc.
- BFD beam failure detection
- Information on BFD-RS may be set (notified) to Information about BFD-RS may be called information about BFR resources.
- a higher layer (eg, MAC layer) of the UE may start a predetermined timer (which may be referred to as a beam failure detection timer) when receiving a beam failure instance notification from the PHY layer of the UE.
- a predetermined timer which may be referred to as a beam failure detection timer
- the MAC layer of the UE receives beam failure instance notifications a certain number of times (for example, beamFailureInstanceMaxCount set by RRC) or more before the timer expires, it triggers BFR (for example, starts one of the random access procedures described later ).
- the base station may determine that the UE has detected a beam failure when there is no notification from the UE or when a predetermined signal (beam recovery request in step S104) is received from the UE.
- step S103 the UE starts searching for a new candidate beam to be newly used for communication for beam recovery.
- the UE may select a new candidate beam corresponding to that RS.
- RSs measured in step S103 are new candidate RS, RS for new candidate beam identification, NCBI-RS (New Candidate Beam Identification RS), RS for new beam identification, RS for new beam identification, NBI-RS (New Beam Identification RS), CBI-RS (Candidate Beam Identification RS), CB-RS (Candidate Beam RS), etc.
- NBI-RS may be the same as or different from BFD-RS. Note that the new candidate beam may be simply called a candidate beam or a candidate RS.
- a UE may determine a beam corresponding to an RS that satisfies a predetermined condition as a new candidate beam.
- the UE may determine new candidate beams based on, for example, the configured NBI-RSs whose L1-RSRP exceeds the threshold. Note that the criteria for judgment are not limited to L1-RSRP.
- L1-RSRP for SSB may be referred to as SS-RSRP.
- L1-RSRP for CSI-RS may be referred to as CSI-RSRP.
- NBI-RS e.g. resources, number of RSs, number of ports, precoding, etc.
- NBI new beam identification
- Information about new candidate RSs may be obtained based on information about BFD-RSs.
- Information about NBI-RS may be called information about resources for NBI or the like.
- BFD-RS may be interchanged with radio link monitoring reference signals (Radio Link Monitoring RS (RLM-RS)).
- RLM-RS Radio Link Monitoring RS
- step S104 the UE that has identified the new candidate beam transmits a beam failure recovery request (BFRQ).
- a beam recovery request may also be referred to as a beam recovery request signal, a beam failure recovery request signal, or the like.
- BFRQ for example, physical uplink control channel (PUCCH), random access channel (PRACH), physical uplink shared channel (PUSCH), configured (setting) It may be transmitted using at least one of a configured grant (CG) PUSCH.
- PUCCH physical uplink control channel
- PRACH random access channel
- PUSCH physical uplink shared channel
- CG configured grant
- the BFRQ may include information on the new candidate beam/new candidate RS identified in step S103.
- Resources for BFRQ may be associated with the new candidate beam.
- Beam information includes beam index (BI), port index of predetermined reference signal, RS index, resource index (for example, CSI-RS resource indicator (CRI)), SSB resource index (SSBRI)) or the like.
- CB-BFR Contention-Based BFR
- CF-BFR Contention-Free BFR
- a UE may transmit a preamble (also called an RA preamble, a Physical Random Access Channel (PRACH), a RACH preamble, etc.) as a BFRQ using PRACH resources.
- a preamble also called an RA preamble, a Physical Random Access Channel (PRACH), a RACH preamble, etc.
- the UE may transmit a randomly selected preamble from one or more preambles.
- the UE may transmit a UE-specific assigned preamble from the base station.
- the base station may assign the same preamble to multiple UEs.
- the base station may assign preambles for individual UEs.
- CB-BFR and CF-BFR are respectively referred to as CB PRACH-based BFR (contention-based PRACH-based BFR (CBRA-BFR)) and CF PRACH-based BFR (contention-free PRACH-based BFR (CFRA-BFR)).
- CBRA-BFR may be referred to as CBRA for BFR
- CFRA-BFR may be referred to as CFRA for BFR.
- information on PRACH resources may be notified by higher layer signaling (RRC signaling, etc.), for example.
- RRC signaling may include information indicating the correspondence between detected DL-RSs (beams) and PRACH resources, and different PRACH resources may be associated with each DL-RS.
- the base station that detected the BFRQ transmits a response signal (which may be called a gNB response or the like) to the BFRQ from the UE.
- the response signal may include reconfiguration information (eg, DL-RS resource configuration information) for one or more beams.
- the response signal may be transmitted, for example, in the UE common search space of PDCCH.
- the response signal is reported using a cyclic redundancy check (CRC) scrambled PDCCH (DCI) by the UE identifier (eg, cell-radio RNTI (Cell-Radio RNTI (C-RNTI))) may be The UE may determine which transmit beam and/or receive beam to use based on the beam reconstruction information.
- CRC cyclic redundancy check
- DCI cell-radio RNTI
- C-RNTI Cell-Radio RNTI
- the UE may monitor the response signal based on at least one of the BFR control resource set (CControl Resource SET (CORESET)) and the BFR search space set.
- CControl Resource SET CORESET
- contention resolution may be determined to be successful when the UE receives the PDCCH corresponding to the C-RNTI for itself.
- a period may be set for the UE to monitor the response from the base station (eg, gNB) to BFRQ.
- the time period may be referred to, for example, as a gNB response window, a gNB window, a beam recovery request response window, and the like.
- the UE may retransmit the BFRQ if no gNB response is detected within the window period.
- the UE may send a message to the base station indicating that the beam reconstruction is complete.
- the message may be transmitted by PUCCH or PUSCH, for example.
- Beam recovery success may represent, for example, the case of reaching step S106.
- a beam recovery failure may correspond, for example, to reaching a predetermined number of BFRQ transmissions or to expiring a beam failure recovery timer (Beam-failure-recovery-Timer).
- Rel. 15 supports beam recovery procedures (eg, BFRQ notification) for beam failures detected in SpCells (PCell/PSCell) using random access procedures.
- the beam recovery procedure for the beam failure detected in the SCell eg, notification of BFRQ
- PUCCH for BFR eg, scheduling request (SR)
- MAC CE for BFR eg, UL-SCH
- the UE may transmit information about beam failures using MAC CE-based two-step.
- the information about beam failure may include information about the cell that detected the beam failure and information about the new candidate beam (or new candidate RS index).
- Step 1 When BF is detected, the UE may transmit a PUCCH-BFR (scheduling request (SR)) to the PCell/PSCell. A UL grant (DCI) for step 2 below may then be sent from the PCell/PSCell to the UE.
- PUCCH-BFR scheduling request
- DCI UL grant
- Step 2 The UE then sends information about the cell in which the beam failure was detected (failed) (e.g., cell index) and information about the new candidate beam using MAC CE via an uplink channel (e.g., PUSCH) to You may transmit to a base station (PCell/PSCell).
- a base station PCell/PSCell
- the QCL of PDCCH/PUCCH/PDSCH/PUSCH may be updated to a new beam.
- step numbers are merely numbers for explanation, and multiple steps may be grouped together or their order may be changed. Also, whether or not to implement BFR may be configured in the UE using higher layer signaling.
- BFD-RS (BFD-RS) Rel.
- the UE sets q 0 bar of periodic (P)-CSI-RS resource configuration index and candidate beam RS list ( candidateBeamRSList) or extended candidate beam RS list (candidateBeamRSListExt-r16) or candidate beam RS list for SCell (candidateBeamRSSCellList-r16) at least one set q 1 of P-CSI-RS resource configuration index and SS/PBCH block index , can be provided.
- the q 0 bar is the overlined notation of “q 0 ”.
- the q0 bar is simply denoted as q0 .
- the q 1 bar is the notation with "q 1 " overlined.
- the q 1 bar is simply denoted as q 1 .
- the set q 0 of P-CSI-RS resources provided by failure detection resources may be referred to as explicit BFD-RS.
- the UE may perform L1-RSRP measurements, etc., using RS resources corresponding to indices in at least one of set q 0 and set q 1 to detect beam failure.
- providing the above-described upper layer parameter indicating the information of the index corresponding to the BFD resource can be interpreted as setting the BFD resource, setting the BFD-RS, etc.
- BFD resource, periodic CSI-RS resource configuration index or SSB index set q 0 , BFD-RS, BFD-RS set, and RS set may be read interchangeably.
- the UE If the UE is not provided q 0 by the failureDetectionResources for one BWP of its serving cell, the UE follows the implicit BFD-RS determination procedure below to determine the RSs (set q 0 ).
- the UE sets the P-CSI-RS resource configuration index having the same value as the RS index in the RS set indicated by the TCI state (TCI-State) for the corresponding CORESET that the UE uses for PDCCH monitoring, set q 0 decision to include in If there are two RS indices in one TCI state, set q 0 contains RS indices with QCL type D configuration for the corresponding TCI state. The UE assumes that set q 0 contains up to two RS indices. The UE assumes a single-port RS within its set q 0 .
- This set q 0 may be called implicit BFD-RS.
- the UE determines the BFD-RS (RS set) according to the PDCCH TCI state.
- the UE assumes that its RS set contains up to two RSs.
- each TRP may be associated with one or more BFD-RSs.
- one or more BFD-RSs may be referred to as a set of BFD-RSs (BFD-RS set).
- BFD-RS set BFD-RS set
- Rel. 15 up to two BFD-RSs are configured per BWP.
- the two BFD-RSs may be called one BFD-RS set.
- Rel. 17 onwards the number of BFD-RSs per BWP may not be two, eg, the number of BFD-RSs may be determined based on UE capabilities.
- NBI-RS NBI-RS
- setting of independent NBI-RS sets for each TRP can be introduced.
- one or more NBI-RSs may be referred to as a set of NBI-RSs (NBI-RS set).
- one BFD-RS set and one NBI-RS set are considered to be associated one-to-one.
- up to 2 BFD-RS sets and 2 BFD-RS sets can be configured per TRP. That is, in the BFR of the TRP, 0, 1 or 2 BFD-RS sets can be configured for each TRP. In such a case, in the case where two BFD-RS sets are configured, the NW can configure only one BFD-RS (NBI-RS) set, or two BFD-RS ( The question is whether the NBI-RS) set must be set.
- BAI-RS BFD-RS
- the number of NBI-RS sets that can be/must be set, and the combination of the allowed number of BFD-RS sets and the number of NBI-RS sets are not sufficiently considered.
- the BFD / BFR of multiple TRPs based on single / multi DCI cannot be appropriately controlled, and the communication quality and throughput decrease. may invite.
- the present inventors came up with the method of setting/determining the BFD-RS set/NBI-RS set.
- A/B/C and “at least one of A, B and C” may be read interchangeably.
- cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, band may be read interchangeably.
- index, ID, indicator, and resource ID may be read interchangeably.
- supporting, controlling, controllable, operating, and capable of operating may be read interchangeably.
- configure, activate, update, indicate, enable, specify, and select may be read interchangeably.
- higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- RRC, RRC signaling, RRC parameters, higher layers, higher layer parameters, RRC information elements (IEs), RRC messages may be read interchangeably.
- Broadcast information includes, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), and other system information ( It may be Other System Information (OSI).
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI System Information
- MAC CE and activation/deactivation commands may be read interchangeably.
- pool, set, group, list, and candidate may be read interchangeably.
- DMRS Downlink Reference Signal
- DMRS port Downlink Reference Signal
- antenna port may be read interchangeably.
- SpCell In the present disclosure, special cells, SpCell, PCell, and PSCell may be read interchangeably.
- beams, spatial domain filters, spatial settings, TCI states, UL TCI states, unified TCI states, unified beams, common TCI states, common beams, TCI assumptions, QCL assumptions, QCL parameters, spatial Domain Receive Filter, UE Spatial Domain Receive Filter, UE Receive Beam, DL Beam, DL Receive Beam, DL Precoding, DL Precoder, DL-RS, TCI State/QCL Assumed QCL Type D RS, TCI State/QCL Assumed QCL type A RS, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, PL-RS may be read interchangeably.
- QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS, SRS may be read interchangeably. good.
- CSI-RS, NZP-CSI-RS, periodic (P)-CSI-RS, P-TRS, semi-persistent (SP)-CSI-RS, aperiodic (A)-CSI-RS, TRS, tracking CSI-RS for use, CSI-RS with TRS information (higher layer parameter trs-Info), NZP CSI-RS resources in the NZP CSI-RS resource set with TRS information, multiple NZP-CSI-RS on the same antenna port NZP-CSI-RS resources and TRS resources in the NZP-CSI-RS resource set consisting of resources may be read interchangeably.
- CSI-RS resource, CSI-RS resource set, CSI-RS resource group, and information element (IE) may be read interchangeably.
- the panel Uplink (UL) transmitting entity, TRP, spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, codeword, base station, antenna port of a signal (e.g., reference signal for demodulation (DeModulation Reference Signal (DMRS)) port), antenna port group for a signal (e.g. DMRS port group), group for multiplexing (e.g. Code Division Multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CORESET subset, CW, redundancy version (RV), layers (MIMO layer, transmission layer, spatial layer) may be read interchangeably. Also, panel identifier (ID) and panel may be read interchangeably.
- DMRS DeModulation Reference Signal
- the TRP ID, the TRP related ID, the CORESET pool index, the position of one of the two TCI states corresponding to one codepoint of the field in the DCI (ordinal number, first TCI state or second TCI state ) and TRP may be read interchangeably.
- TRP transmission point
- panel DMRS port group
- CORESET pool one of two TCI states associated with one codepoint of the TCI field may be read interchangeably.
- single TRP, single TRP system, single TRP transmission, and single PDSCH may be read interchangeably.
- multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be read interchangeably.
- a single DCI, a single PDCCH, multiple TRPs based on a single DCI, and activating two TCI states on at least one TCI codepoint may be read interchangeably.
- single TRP single TRP
- channels with single TRP channels with one TCI state/spatial relationship
- multi-TRP not enabled by RRC/DCI multiple TCI states/spatial relations enabled by RRC/DCI shall not be set
- neither CORESET Pool Index (CORESETPoolIndex) value of 1 shall be set for any CORESET
- neither codepoint of the TCI field shall be mapped to two TCI states.
- multi-TRP channels with multi-TRP, channels with multiple TCI state/spatial relationships, multi-TRP enabled by RRC/DCI, multiple TCI state/spatial relationships enabled by RRC/DCI and at least one of multi-TRP based on a single DCI and multi-TRP based on multiple DCIs
- multi-TRPs based on multi-DCI setting a CORESET pool index (CORESETPoolIndex) value of 1 for a CORESET, may be read interchangeably.
- multiple TRPs based on a single DCI, where at least one codepoint of a TCI field is mapped to two TCI states may be read interchangeably.
- TRP#1 first TRP
- TRP#2 second TRP
- TRP#1 first TRP
- TRP#2 second TRP
- CORESET0 CORESET with index 0, and common CORESET may be read interchangeably.
- the total/final number of BFD-RS sets/number of NBI-RS sets may be determined by explicit configuration or by implicit decision rules.
- 0 BFD-RS sets may be explicitly configured. That is, the BFD-RS set may not be configured.
- an implicit BFD-RS set decision rule may be applied.
- a total of one BFD-RS set may be determined.
- the BFD-RSs included in the BFD-RS set may be RSs that have a CORESET and QCL relationship.
- a total of two BFD-RS sets may be determined.
- the BFD-RSs included in the BFD-RS set may be RSs that have a QCL relationship (QCLed with CORESET) with the CORESET of each CORESET pool index in multiple TRPs based on multiple DCIs.
- a new RRC parameter may be configured to indicate enable/disable of implicit BFD-RS set determination. For example, when the parameter indicates that it is disabled (not valid), the determined total BFD-RS set may be zero.
- a new RRC parameter may also be configured to indicate the number of total/implicit BFD-RS sets derived by the UE when no BFD-RS sets are configured.
- the parameter may indicate 0, 1 or 2.
- a total of 1 or 2 BFD-RS sets may be determined respectively.
- the total BFD-RS sets determined may be 0.
- One BFD-RS set may be explicitly configured.
- the configured BFD-RS set may be used for BFR per cell, or if the association between TRP and BFD-RS is configured, it may be used for BFR of a specific TRP in BFR per TRP. good too.
- the implicit BFD-RS set decision rule may not apply.
- a total of one BFD-RS set may be configured for BFR for each cell.
- one BFD-RS set may be configured for a specific TRP in the BFR for each TRP, and no BFD-RS set may be determined for other TRPs.
- an implicit BFD-RS set decision rule may additionally be applied.
- one BFD-RS set is set for a specific TRP in the BFR per TRP, and one BFD-RS set is determined for other TRPs based on an implicit BFD-RS set determination rule. It doesn't have to be.
- the BFD-RS included in the BFD-RS set for the other TRP is an RS in a QCL relationship with a CORESET of a CORESET pool index different from the CORESET pool index of a specific TRP in multiple TRPs based on multi-DCI may be
- a new RRC parameter for indicating enable/disable of implicit BFD-RS set determination may be configured.
- the parameter indicates that it is disabled (not valid)
- the determined total BFD-RS set may be zero.
- a new RRC parameter may be configured to indicate the number of total/implicit BFD-RS sets derived by the UE when one BFD-RS set is explicitly configured. For example, the parameter may indicate 0 or 1. When the parameter indicates 1, a total of one BFD-RS set may be determined. When the parameter indicates 0, the total BFD-RS sets determined may be 0.
- a new RRC parameter may implicitly indicate information about the TRP that derives the BFD-RS set (for example, information about the CORESET pool index). For example, when implicitly deriving one BFD-RS set is indicated, the new RRC parameter indicates information about the TRP that implicitly derives the BFD-RS set (for example, information about the CORESET pool index). You may
- Two BFD-RS sets may be explicitly configured.
- the configured BFD-RS set may be used for each TRP's BFD-RS in the per-TRP BFR.
- the implicit BFD-RS set decision rule may not apply.
- an RS that is in a relationship between a CORESET and a QCL is a CORESET specific QCL type (for example, QCL type D) may mean the RS of
- signaling configuration may be read interchangeably.
- BFR, BFR setting, BFR procedure, BFD, BFD procedure, BFD-RS, BFD-RS setting, RLM, RLM setting, RLM procedure, RLM-RS, RLM-RS setting, NBI, NBI setting, NBI- RS and NBI-RS setting may be read interchangeably.
- cell-specific BFR, Rel. BFR of 15/16 may be read interchangeably.
- TRP BFR, TRP-specific BFR, Rel. 17/Rel. 17 and later BFRs may be read interchangeably.
- setting a certain parameter/number/combination may mean explicitly setting a certain parameter/number/combination.
- determining a certain parameter/number/combination may mean that a certain parameter/number/combination is determined based on an implicit rule.
- a combination of the total number of BFD-RS sets and the total number of NBI-RS sets for BFR per TRP in a certain CC may be set/determined.
- one or more RSs may be configured in one set depending on/based on UE capabilities.
- each set may be associated with a TRP.
- the total BFD-RS set may include at least one of explicitly set BFD-RSs and implicitly determined BFD-RSs.
- FIG. 3 is a diagram showing an example of combinations of the total number of BFD-RS sets and the total number of NBI-RS sets.
- the total number of BFD-RS sets and the total number of NBI-RS sets can be 0, 1 or 2, respectively.
- All combinations of the number of BFD-RS sets and the number of NBI-RS sets may be allowed.
- cases where the total number of NBI-RS sets is larger than the total number of BFD-RS sets are not allowed good.
- the UE may not assume/expect a case where the total number of NBI-RS sets is larger than the total number of BFD-RS sets configured/determined. Cases 0-1, 0-2 and 1-2 shown in FIG. 3 will not be described in detail below.
- case 2-2 may be allowed.
- each BFD-RS set and each NBI-RS set may correspond one-to-one.
- a correspondence/association between each BFD-RS set and each NBI-RS set may be defined. Case 2-2 shown in FIG. 3 will also not be detailed below.
- a total BFD-RS set number of 0 may not be allowed. This is because implicit decision rules are applied when there is no explicit BFD-RS (set) configuration.
- the total number of BFD-RS sets is 0 for at least one BFD-RS (set) in a CC with a particular frequency range (eg, FR2).
- the UE may not assume/expect the total number of BFD-RS sets to be 0 in a CC in a particular frequency range (eg, FR2).
- Zero BFD-RS set numbers may be allowed for a CC in a particular frequency range (eg, FR2).
- the UE may expect/expect the total number of BFD-RS sets to be zero in a CC in a particular frequency range (eg, FR2).
- a new RRC parameter may be defined to indicate enable/disable of implicit determination of the BFD-RS set for a certain CC (or a certain UE in a certain frequency range). For example, the UE may determine that the total BFD-RS set to be determined is 0 when the parameter is indicated to be disabled (not valid).
- 0 BFD-RS is configured/determined (that is, BFD-RS is not configured/determined)
- 0 NBI-RS may be configured/determined (NBI-RS is configured/determined may be omitted).
- UE if 0 BFD-RS is configured / determined (if BFD-RS is not configured / determined), 0 NBI-RS is configured / determined (NBI-RS is not configured / determined) can be judged.
- the UE may perform the BFD/BFR procedure using individual BFD-RSs.
- the individual BFD-RS may be a BFD-RS configured in existing specifications (defined up to Rel.16).
- the UE assumes/expects configuration/determination of one NBI-RS in the CC.
- the UE may not assume/expect that the NBI-RS set is not configured/determined when the BFD-RS set is configured/determined.
- one additional NBI-RS set may be set/determined (option 2-1-1).
- Option 2-1-1 may follow at least one of Option 2-1-1-A and Option 2-1-1-B.
- one NBI-RS set may be configured as BFR per cell in multiple TRPs.
- Rel. NBI-RS may be configured according to the BFR procedures specified by 16 (option 2-1-1-A).
- one NBI-RS set may be set as BFR for each TRP (for only one TRP) when using multiple TRPs (option 2-1- 1-B).
- one BFD-RS set/NBI-RS set may be associated with one TRP (eg, other group ID based on CORESET pool index/single DCI).
- BFR procedures and UE behavior after beam recovery may be applied for that associated TRP.
- the UE may assume/judge not to perform BFD/BFR for TRPs other than the associated TRP.
- Option 2-1-1-B may be applied only to cases where BFD-RS (set) is explicitly set. This is because, in the case where the BFD-RS (set) is implicitly determined, the method of determining one set for only one TRP is not defined.
- option 2-1-1-B may be applied to the case where BFD-RS (set) is explicitly set and the case where BFD-RS (set) is implicitly determined.
- new RRC parameters may be defined.
- the RRC parameter may be a parameter for instructing to determine one or two implicit BFD-RS sets.
- the parameter may indicate information about the TRP corresponding to the BFD-RS set.
- the NE may signal the UE an RRC parameter that directs the determination of one BFD-RS set associated with a CORESET pool index of a particular value (eg, 0).
- NBI-RS may not be configured/determined.
- the MAC CE for BFR may not contain information on the new beam identification for that CC.
- the BFR MAC CE does not contain information on the new beam identification for the CC
- the BFR MAC CE contains information on which CC the beam failure has occurred. but does not include information about new beam identification (eg, new beam index).
- BFR MAC CE contains information about which CC has a beam failure, but does not contain information about new beam identification (for example, new beam index)
- the BFR MAC CE does not contain information about the new beam identification for the CC
- the BFR MAC CE does not contain information about which CC the beam failure has occurred.” It may be read as "No”.
- the BFR MAC CE does not contain information about which CC has a beam failure means that, for example, if the NBI-RS (set) is not set for the UE, the BFR MAC CE is not transmitted. may mean.
- the UE since a new beam for recovery is not determined/configured, the UE is after the BFR is triggered, after the MAC CE for BFR is triggered, or after receiving a response from the NW It may be assumed that the CC/TRP will be deactivated after a certain period of time. In addition, the UE is instructed/notified to deactivate CC/TRP after BFR is triggered, after MAC CE for BFR is triggered, or after a specific period of time after receiving a response from the NW. may
- the UE may assume/expect configuration/determination of NBI-RS.
- the UE may not assume/expect that the NBI-RS set is not configured/determined when the BFD-RS set is configured/determined.
- the UE may expect/expect at least one NBI-RS set to be configured/determined.
- one NBI-RS set may be configured/determined (option 3-1-1).
- Option 3-1-1 may follow at least one of Options 3-1-1-A, 3-1-1-B and 3-1-1-C.
- one NBI-RS set may be configured to be associated with only one BFD-RS set (option 3-1-1-A). There may be no NBI-RS associated with another BFD-RS.
- BFR for each TRP may be applied for TRPs corresponding to both the BFD-RS set and the NBI-RS set.
- the BFR MAC CE may not contain information on the new beam identification for that TRP. Also, since a new beam for recovery is not set/determined for the TRP, the TRP may be deactivated after the BFR is triggered.
- one NBI-RS set may not be explicitly associated with a BFD-RS set (Option 3-1-1-B).
- the UE may, by default, assume that the first TRP (eg, the TRP corresponding to the minimum/maximum TRP index) is associated with one NBI-RS set.
- one NBI-RS set may be configured not to be associated with any BFD-RS set (Option 3-1-1-C).
- the UE uses the BFR MAC CE to detect the NBI-RS for a certain CC if the NBI-RS can be found. may report.
- the operation of the UE upon recovery to the new beam may be applied only to the TRPs for which the beam failure has been detected. Also, at this time, the operation of the UE upon recovery to the new beam may be applied to the CC (multiple (for example, two) TRPs).
- option 3-1-1-C if beam failure occurs in two TRPs, the UE, if NBI-RS can be found, uses MAC CE for BFR to NBI- RS may be reported. At this time, the operation of the UE upon recovery to the new beam may be applied to the CC (multiple (for example, two) TRPs).
- the UE may expect/expect two NBI-RS sets to be configured/determined.
- two NBI-RS sets may be configured/determined (option 3-1-2).
- the UE may perform the same BFR operation as case 2-2 above.
- each BFD-RS set and each NBI-RS set may be associated one-to-one.
- Option 3-2 When two BFD-RS sets are configured/determined, NBI-RS may not be configured/determined.
- Option 3-2 may use the aspect described in Option 2-2.
- the UE may not assume/expect zero or one NBI-RS set to be configured/determined.
- the UE may expect/expect two NBI-RS sets to be configured/determined.
- the UE may not assume/expect that one NBI-RS set is configured/determined.
- the UE may expect/expect zero or two NBI-RS sets to be configured/determined.
- One NBI-RS set may be configured/determined when two BFD-RS sets are configured/determined.
- the aspect of Option 3-1-1 described above may be used.
- the BFR operation can be appropriately controlled according to the number of BFD-RS sets and the number of NBI-RS sets that are set/determined.
- ⁇ Second embodiment> an implicit determination/derivement method for the NBI-RS set is described.
- the UE may derive/determine the NBI-RS set based on certain rules when the NBI-RS set is not explicitly configured.
- the UE may assume that one or more SSB/CSI-RSs are the set of NBI-RSs in the BFR per cell.
- the UE may, for per-cell BFR, associate the plurality of SSB/CSI-RS associated with the first TRP with the first and the SSB/CSI-RS associated with the second TRP are the NBI-RS sets for the second TRP.
- the first TRP may be the TRP corresponding to the first TRP index
- the second TRP may be the TRP corresponding to the second TRP index.
- the first TRP may be the TRP corresponding to the minimum (or maximum) TRP index
- the second TRP may be the TRP corresponding to the maximum (or minimum) TRP index. good.
- the plurality of SSB/CSI-RSs may be all SSB/CSI-RSs among SSB/CSI-RSs set in the higher layer (for each TRP), or some SSBs /CSI-RS.
- the CSI-RS may be a periodic (P-) CSI-RS.
- the UE may be configured whether to enable/disable implicit NBI-RS (set) determination using higher layer signaling (RRC signaling).
- the implicit NBI-RS (set) determination may be made per CC, per TRP, or per frequency range.
- the NBI-RS (set) can be appropriately derived.
- the number of explicitly configured BFD-RS (NBI-RS) sets may be referred to as the number of explicit BFD-RS (NBI-RS) sets.
- the number of implicitly determined BFD-RS (NBI-RS) sets may also be referred to as the number of implicit BFD-RS (NBI-RS) sets.
- the sum of the number of explicit BFD-RS (NBI-RS) sets and the number of explicit BFD-RS (NBI-RS) sets may be referred to as the total number of BFD-RS (NBI-RS) sets.
- the number of total/explicit NBI-RS sets shall be the same as the number of explicit BFD-RS sets.
- the UE may assume/expect that the total/explicit NBI-RS set number is the same as the explicit BFD-RS set number (aspect 3-1).
- the total/explicit NBI-RS set number must be less than or equal to the explicit BFD-RS set number.
- the UE may assume/expect that the total/explicit NBI-RS set number is less than or equal to the explicit BFD-RS set number (aspect 3-2).
- the number of total/explicit NBI-RS sets shall be the same as the total number of BFD-RS sets.
- the UE may assume/expect that the total/explicit NBI-RS set number is the same as the total BFD-RS set number (aspect 3-3).
- the total/explicit NBI-RS set number must be less than or equal to the total BFD-RS set number.
- the UE may assume/expect that the total/explicit NBI-RS set number is less than or equal to the total BFD-RS set number (aspect 3-4).
- FIG. 4 is a diagram showing an example of the number of BFD-RS sets and the number of NBI-RS sets according to the third embodiment.
- the total number of BFD-RS sets and the total number of NBI-RS sets can be 0, 1 or 2, respectively.
- the total BFD-RS set number X is divided into an explicitly set BFD-RS set number X E and an explicitly determined BFD-RS set number XI.
- case (1, 0)-0 may not be allowed. Further, according to aspect 3-2 or aspect 3-4, case (1, 0)-0 may be settable.
- case (1, 0)-1 may be configurable.
- case (1, 0)-2 may not be allowed.
- case (0, 1)-0 may not be allowed. Further, according to mode 3-1, mode 3-2, or mode 3-4, case (0, 1)-0 may be settable.
- case (0, 1)-1 may not be allowed. Further, according to aspect 3-3 or aspect 3-4, case (0, 1)-1 may be settable.
- case (0, 1)-2 may not be allowed.
- case (2, 0)-0 may not be allowed. Further, according to aspect 3-2 or aspect 3-4, case (2, 0)-0 may be settable.
- case (2, 0)-1 may not be allowed. Further, according to aspect 3-2 or aspect 3-4, case (2, 0)-1 may be settable. If case (2,0)-1 is configurable, the association between NBI-RS and one BFD-RS set may be defined. The association may be set/indicated to the UE using higher layer signaling/physical layer signaling, or association rules may be specified in advance. The rule may be, for example, that the NBI-RS set is associated by default with the TRP corresponding to the lowest (or highest) TRP index.
- case (2, 0)-2 may be configurable.
- case (1, 1)-0 may not be allowed. Further, according to aspect 3-2 or aspect 3-4, case (1, 1)-0 may be settable.
- case (1, 1)-1 may not be allowed. Further, according to Aspect 3-1, Aspect 3-2, or Aspect 3-4, Case (1, 1)-1 may be settable. If case (1,1)-1 is configurable, the association between NBI-RS and one BFD-RS set may be defined. The association may be set/indicated to the UE using higher layer signaling/physical layer signaling, or association rules may be specified in advance. The rule may be, for example, that the NBI-RS set is associated with an explicitly configured BFD-RS set.
- case (1, 1)-2 may not be allowed. Further, according to aspect 3-3 or aspect 3-4, case (1, 1)-2 may be settable. If case (1,1)-2 is configurable, the association between NBI-RS and one BFD-RS set may be defined. The association may be set/indicated to the UE using higher layer signaling/physical layer signaling, or association rules may be specified in advance. The rule may be, for example, that each NBI-RS set is associated with each BFD-RS set corresponding to the same TRP.
- case (0, 2)-0 may not be allowed. Further, according to mode 3-1, mode 3-2, or mode 3-4, case (0, 2)-0 may be settable.
- case (0, 2)-1 may not be allowed. Further, according to aspect 3-4 above, case (0, 2)-1 may be settable. If case (0,2)-1 is configurable, the association between NBI-RS and one BFD-RS set may be defined. The association may be set/indicated to the UE using higher layer signaling/physical layer signaling, or association rules may be specified in advance. The rule may be, for example, that the NBI-RS set is associated by default with the TRP corresponding to the lowest (or highest) TRP index.
- case (0, 2)-2 may not be allowed. Further, according to aspect 3-3 or aspect 3-4, case (0, 2)-2 may be settable. If case (0,2)-2 is configurable, the association between NBI-RS and one BFD-RS set may be defined. The association may be set/indicated to the UE using higher layer signaling/physical layer signaling, or association rules may be specified in advance. The rule may be, for example, that each NBI-RS set is associated with each BFD-RS set corresponding to the same TRP.
- the BFR operation can be controlled more flexibly according to the number of BFD-RS sets and the number of NBI-RS sets that are set/determined.
- RRC IEs Higher layer parameters/UE capabilities corresponding to features in at least one of the above embodiments may be defined.
- UE capabilities may indicate support for this feature.
- a UE for which a higher layer parameter corresponding to that function (enabling that function) is set may perform that function. It may be defined that "UEs for which upper layer parameters corresponding to the function are not set shall not perform the function (for example, according to Rel. 15/16)".
- a UE reporting UE capabilities indicating that it supports that function may perform that function. It may be specified that "a UE that does not report UE capabilities indicating that it supports the feature shall not perform that feature (eg according to Rel. 15/16)".
- a UE may perform a function if it reports a UE capability indicating that it supports the function, and the higher layer parameters corresponding to the function are configured. "If the UE does not report a UE capability indicating that it supports the function, or if the upper layer parameters corresponding to the function are not set, the UE does not perform the function (e.g., according to Rel. 15/16 ) may be defined.
- the UE capability may indicate whether the UE supports this function.
- the function may be explicit BFD-RS set configuration/implicit BFD-RS set determination.
- the function may be explicit NBI-RS set configuration/implicit NBI-RS set determination.
- the UE capability may be defined by whether the UE supports configuration of 1/2/up to 2 BFD-RS sets in BFR per TRP for multiple TRPs based on single DCI/multi-DCI.
- UE capability may be defined in terms of the number of RS resources in the BFD-RS set.
- the UE capability may be defined by whether the UE supports configuration of 1/2/up to 2 NBI-RS sets in BFR per TRP for multiple TRPs based on single DCI/multi-DCI.
- UE capability may be defined in terms of the number of RS resources in the NBI-RS set.
- UE capability may be defined as whether the UE supports configuration of 1/2 NBI-RS sets when 1/2 BFD-RS sets are configured in BFR per TRP.
- UE capability may be defined by whether the UE supports the configuration of two BFD-RS sets and one NBI-RS set.
- a UE capability may be defined by whether or not the UE supports association of one NBI-RS set and one BFD-RS set out of two BFD-RS sets.
- UE capability may be defined by whether or not the UE supports the association of one NBI-RS set and two BFD-RS sets.
- UE capability may be defined as whether the UE supports deactivation of TRP/CC in the case of performing BFR on TRP/CC without NBI-RS (set).
- the deactivation may be deactivation assumed by the UE.
- UE capability may be defined by whether the UE supports enabling/disabling of implicit BFD-RS (set) determination.
- Validity/invalidation of the implicit BFD-RS (set) determination may be performed for each CC/multiple CCs, may be performed for each TRP, or may be performed for each frequency range. good too. Also, the valid/invalid determination of the implicit BFD-RS (set) may be performed in one set or in two sets.
- the UE capability may be defined by whether the UE supports implicit NBI-RS (set) determination.
- the implicit NBI-RS (set) determination may be per CC/multiple CCs, per TRP, or per frequency range. Also, the implicit NBI-RS (set) determination may be performed in one set or in two sets.
- the UE can implement the above functions while maintaining compatibility with existing specifications.
- wireless communication system A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below.
- communication is performed using any one of the radio communication methods according to the above embodiments of the present disclosure or a combination thereof.
- FIG. 5 is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by the Third Generation Partnership Project (3GPP). .
- LTE Long Term Evolution
- 5G NR 5th generation mobile communication system New Radio
- 3GPP Third Generation Partnership Project
- the wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- RATs Radio Access Technologies
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)), etc.
- RATs Radio Access Technologies
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)), etc.
- LTE Evolved Universal Terrestrial Radio Access
- EN-DC E-UTRA-NR Dual Connectivity
- NE-DC NR-E -UTRA Dual Connectivity
- the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN).
- the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.
- the wireless communication system 1 has dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB) )) may be supported.
- dual connectivity NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB)
- gNB NR base stations
- a wireless communication system 1 includes a base station 11 forming a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) arranged in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. You may prepare.
- a user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and user terminals 20 are not limited to the embodiment shown in the figure.
- the base stations 11 and 12 are collectively referred to as the base station 10 when not distinguished.
- the user terminal 20 may connect to at least one of the multiple base stations 10 .
- the user terminal 20 may utilize at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)).
- Macrocell C1 may be included in FR1, and small cell C2 may be included in FR2.
- FR1 may be a frequency band below 6 GHz (sub-6 GHz)
- FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.
- the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- a plurality of base stations 10 may be connected by wire (for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
- wire for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) is an IAB Also called a node.
- IAB Integrated Access Backhaul
- relay station relay station
- the base station 10 may be connected to the core network 30 directly or via another base station 10 .
- the core network 30 may include, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), and the like.
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal compatible with at least one of communication schemes such as LTE, LTE-A, and 5G.
- a radio access scheme based on orthogonal frequency division multiplexing may be used.
- OFDM orthogonal frequency division multiplexing
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a radio access method may be called a waveform.
- other radio access schemes for example, other single-carrier transmission schemes and other multi-carrier transmission schemes
- the UL and DL radio access schemes may be used as the UL and DL radio access schemes.
- a downlink shared channel Physical Downlink Shared Channel (PDSCH)
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- PDCCH Physical Downlink Control Channel
- an uplink shared channel (PUSCH) shared by each user terminal 20 an uplink control channel (PUCCH), a random access channel (Physical Random Access Channel (PRACH)) or the like may be used.
- PUSCH uplink shared channel
- PUCCH uplink control channel
- PRACH Physical Random Access Channel
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by the PDSCH.
- User data, higher layer control information, and the like may be transmitted by PUSCH.
- a Master Information Block (MIB) may be transmitted by the PBCH.
- Lower layer control information may be transmitted by the PDCCH.
- the lower layer control information may include, for example, downlink control information (DCI) including scheduling information for at least one of PDSCH and PUSCH.
- DCI downlink control information
- the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc.
- the DCI that schedules PUSCH may be called UL grant, UL DCI, etc.
- PDSCH may be replaced with DL data
- PUSCH may be replaced with UL data.
- a control resource set (CControl Resource SET (CORESET)) and a search space (search space) may be used for PDCCH detection.
- CORESET corresponds to a resource searching for DCI.
- the search space corresponds to the search area and search method of PDCCH candidates.
- a CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with certain search spaces based on the search space settings.
- One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set. Note that “search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. in the present disclosure may be read interchangeably.
- PUCCH channel state information
- acknowledgment information for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.
- SR scheduling request
- a random access preamble for connection establishment with a cell may be transmitted by the PRACH.
- downlink, uplink, etc. may be expressed without adding "link”.
- various channels may be expressed without adding "Physical" to the head.
- synchronization signals SS
- downlink reference signals DL-RS
- the DL-RS includes a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DeModulation Reference Signal (DMRS)), Positioning Reference Signal (PRS)), Phase Tracking Reference Signal (PTRS)), etc.
- CRS cell-specific reference signal
- CSI-RS channel state information reference signal
- DMRS Demodulation reference signal
- PRS Positioning Reference Signal
- PTRS Phase Tracking Reference Signal
- the synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- a signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called SS/PBCH block, SS Block (SSB), and so on.
- SS, SSB, etc. may also be referred to as reference signals.
- DMRS may also be called a user terminal-specific reference signal (UE-specific reference signal).
- FIG. 6 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- the base station 10 comprises a control section 110 , a transmission/reception section 120 , a transmission/reception antenna 130 and a transmission line interface 140 .
- One or more of each of the control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission line interface 140 may be provided.
- this example mainly shows the functional blocks that characterize the present embodiment, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 110 controls the base station 10 as a whole.
- the control unit 110 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (eg, resource allocation, mapping), and the like.
- the control unit 110 may control transmission/reception, measurement, etc. using the transmission/reception unit 120 , the transmission/reception antenna 130 and the transmission line interface 140 .
- the control unit 110 may generate data to be transmitted as a signal, control information, a sequence, etc., and transfer them to the transmission/reception unit 120 .
- the control unit 110 may perform call processing (setup, release, etc.) of communication channels, state management of the base station 10, management of radio resources, and the like.
- the transmitting/receiving section 120 may include a baseband section 121 , a radio frequency (RF) section 122 and a measuring section 123 .
- the baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212 .
- the transmitting/receiving unit 120 is configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure. be able to.
- the transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of the transmission processing section 1211 and the RF section 122 .
- the receiving section may be composed of a reception processing section 1212 , an RF section 122 and a measurement section 123 .
- the transmitting/receiving antenna 130 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 120 may receive the above-described uplink channel, uplink reference signal, and the like.
- the transmitting/receiving unit 120 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 120 (transmission processing unit 1211) performs Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control for example, HARQ retransmission control
- the transmission/reception unit 120 (transmission processing unit 1211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (DFT) on the bit string to be transmitted. Processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, transmission processing such as digital-to-analog conversion may be performed, and the baseband signal may be output.
- channel coding which may include error correction coding
- modulation modulation
- mapping mapping
- filtering filtering
- DFT discrete Fourier transform
- DFT discrete Fourier transform
- the transmitting/receiving unit 120 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 130. .
- the transmitting/receiving unit 120 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 130.
- the transmission/reception unit 120 (reception processing unit 1212) performs analog-to-digital conversion, Fast Fourier transform (FFT) processing, and Inverse Discrete Fourier transform (IDFT) processing on the acquired baseband signal. )) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing. User data and the like may be acquired.
- FFT Fast Fourier transform
- IDFT Inverse Discrete Fourier transform
- the transmitting/receiving unit 120 may measure the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, etc. based on the received signal.
- the measurement unit 123 measures received power (for example, Reference Signal Received Power (RSRP)), reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)) , signal strength (for example, Received Signal Strength Indicator (RSSI)), channel information (for example, CSI), and the like may be measured.
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- RSSI Received Signal Strength Indicator
- channel information for example, CSI
- the transmission path interface 140 transmits and receives signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, etc., and user data (user plane data) for the user terminal 20, control plane data, and the like. Data and the like may be obtained, transmitted, and the like.
- the transmitter and receiver of the base station 10 in the present disclosure may be configured by at least one of the transmitter/receiver 120, the transmitter/receiver antenna 130, and the transmission line interface 140.
- the control unit 110 sets at least one of 0 or more beam failure detection reference signal (BFD-RS) sets and determines 0 or more BFD-RS sets, and 0 or more new beam identification reference signals (NBI-RS ) set and/or determination of zero or more NBI-RS sets.
- BFD-RS beam failure detection reference signal
- NBI-RS new beam identification reference signals
- Transmitting/receiving unit 120, at least one of one or more BFD-RS included in the BFD-RS set and one or more NBI-RS included in the NBI-RS set, which is determined based on the assumption. may be transmitted (first and third embodiments).
- FIG. 7 is a diagram illustrating an example of the configuration of a user terminal according to one embodiment.
- the user terminal 20 includes a control section 210 , a transmission/reception section 220 and a transmission/reception antenna 230 .
- One or more of each of the control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided.
- this example mainly shows the functional blocks of the features of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 210 controls the user terminal 20 as a whole.
- the control unit 210 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 210 may control signal generation, mapping, and the like.
- the control unit 210 may control transmission/reception, measurement, etc. using the transmission/reception unit 220 and the transmission/reception antenna 230 .
- the control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission/reception unit 220 .
- the transmitting/receiving section 220 may include a baseband section 221 , an RF section 222 and a measurement section 223 .
- the baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212 .
- the transmitting/receiving unit 220 can be configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure.
- the transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of a transmission processing section 2211 and an RF section 222 .
- the receiving section may include a reception processing section 2212 , an RF section 222 and a measurement section 223 .
- the transmitting/receiving antenna 230 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 220 may transmit the above-described uplink channel, uplink reference signal, and the like.
- the transmitter/receiver 220 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- RLC layer processing for example, RLC retransmission control
- MAC layer processing for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control
- the transmitting/receiving unit 220 (transmission processing unit 2211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), and IFFT processing on a bit string to be transmitted. , precoding, digital-analog conversion, and other transmission processing may be performed, and the baseband signal may be output.
- Whether or not to apply DFT processing may be based on transform precoding settings. Transmitting/receiving unit 220 (transmission processing unit 2211), for a certain channel (for example, PUSCH), if transform precoding is enabled, the above to transmit the channel using the DFT-s-OFDM waveform
- the DFT process may be performed as the transmission process, or otherwise the DFT process may not be performed as the transmission process.
- the transmitting/receiving unit 220 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 230. .
- the transmitting/receiving section 220 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 230.
- the transmission/reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (error correction) on the acquired baseband signal. decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmitting/receiving section 220 may measure the received signal.
- the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal.
- the measuring unit 223 may measure received power (eg, RSRP), received quality (eg, RSRQ, SINR, SNR), signal strength (eg, RSSI), channel information (eg, CSI), and the like.
- the measurement result may be output to control section 210 .
- the transmitter and receiver of the user terminal 20 in the present disclosure may be configured by at least one of the transmitter/receiver 220, the transmitter/receiver antenna 230, and the transmission line interface 240.
- the control unit 210 sets at least one of 0 or more beam failure detection reference signal (BFD-RS) sets and determines 0 or more BFD-RS sets, and 0 or more new beam identification reference signals (NBI-RS ) set and/or determination of zero or more NBI-RS sets.
- BFD-RS beam failure detection reference signal
- NBI-RS new beam identification reference signals
- Transmitting/receiving unit 220, at least one of one or more BFD-RS included in the BFD-RS set and one or more NBI-RS included in the NBI-RS set, which is determined based on the assumption. may be received (first and third embodiments).
- Control unit 210 determines that the total number of the number of BFD-RS sets to be set and the number of BFD-RS sets to be determined is the sum of the number of NBI-RS sets to be set and the number of NBI-RS sets to be determined. It may be assumed that there are more than the number (first embodiment).
- the transmitting/receiving unit 220 may receive an upper layer parameter that enables at least one of the BFD-RS set determination and the NBI-RS set determination (first and second embodiments).
- the control unit 210 may determine the NBI-RS set based on at least one of the index for the synchronization signal block and the index for the channel state information reference signal set in higher layer signaling (second implementation form).
- each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.
- a functional block may be implemented by combining software in the one device or the plurality of devices.
- function includes judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deem , broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (component) that performs transmission may be called a transmitting unit, a transmitter, or the like. In either case, as described above, the implementation method is not particularly limited.
- a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 8 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to one embodiment.
- the base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. .
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.
- processor 1001 may be implemented by one or more chips.
- predetermined software program
- the processor 1001 performs calculations, communication via the communication device 1004 and at least one of reading and writing data in the memory 1002 and the storage 1003 .
- the processor 1001 operates an operating system and controls the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like.
- CPU central processing unit
- control unit 110 210
- transmission/reception unit 120 220
- FIG. 10 FIG. 10
- the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them.
- programs program codes
- software modules software modules
- data etc.
- the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be similarly implemented.
- the memory 1002 is a computer-readable recording medium, such as Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or at least any other suitable storage medium. may be configured by one.
- the memory 1002 may also be called a register, cache, main memory (main storage device), or the like.
- the memory 1002 can store executable programs (program code), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also be called an auxiliary storage device.
- a computer-readable recording medium for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also
- the communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes a high-frequency switch, duplexer, filter, frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD), for example. may be configured to include
- the transmitting/receiving unit 120 (220), the transmitting/receiving antenna 130 (230), and the like described above may be realized by the communication device 1004.
- the transmitter/receiver 120 (220) may be physically or logically separated into a transmitter 120a (220a) and a receiver 120b (220b).
- the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
- Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses between devices.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. It may be configured including hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.
- DSP digital signal processor
- ASIC application specific integrated circuit
- PLD programmable logic device
- FPGA field programmable gate array
- a signal may also be a message.
- a reference signal may be abbreviated as RS, and may also be called a pilot, a pilot signal, etc., depending on the applicable standard.
- a component carrier may also be called a cell, a frequency carrier, a carrier frequency, or the like.
- a radio frame may consist of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) that make up a radio frame may be called a subframe.
- a subframe may consist of one or more slots in the time domain.
- a subframe may be a fixed time length (eg, 1 ms) independent of numerology.
- a numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel.
- Numerology for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration , a particular filtering process performed by the transceiver in the frequency domain, a particular windowing process performed by the transceiver in the time domain, and/or the like.
- a slot may consist of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may also be a unit of time based on numerology.
- a slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) transmitted in time units larger than a minislot may be referred to as PDSCH (PUSCH) Mapping Type A.
- PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.
- Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.
- one subframe may be called a TTI
- a plurality of consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum scheduling time unit in wireless communication.
- a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis.
- radio resources frequency bandwidth, transmission power, etc. that can be used by each user terminal
- a TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, or the like.
- a TTI that is shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
- the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms
- the short TTI e.g., shortened TTI, etc.
- a TTI having the above TTI length may be read instead.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain.
- the number of subcarriers included in the RB may be the same regardless of the neumerology, eg twelve.
- the number of subcarriers included in an RB may be determined based on neumerology.
- an RB may contain one or more symbols in the time domain and may be 1 slot, 1 minislot, 1 subframe or 1 TTI long.
- One TTI, one subframe, etc. may each be configured with one or more resource blocks.
- One or more RBs are Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB Also called a pair.
- PRB Physical Resource Block
- SCG Sub-Carrier Group
- REG Resource Element Group
- PRB pair RB Also called a pair.
- a resource block may be composed of one or more resource elements (Resource Element (RE)).
- RE resource elements
- 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
- a Bandwidth Part (which may also be called a bandwidth part) represents a subset of contiguous common resource blocks (RBs) for a numerology on a carrier.
- the common RB may be identified by an RB index based on the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP for UL
- BWP for DL DL BWP
- One or multiple BWPs may be configured for a UE within one carrier.
- At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP.
- BWP bitmap
- radio frames, subframes, slots, minislots, symbols, etc. described above are merely examples.
- the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers and the number of symbols in a TTI, symbol length, cyclic prefix (CP) length, etc. can be varied.
- the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indicated by a predetermined index.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of
- information, signals, etc. can be output from a higher layer to a lower layer and/or from a lower layer to a higher layer.
- Information, signals, etc. may be input and output through multiple network nodes.
- Input/output information, signals, etc. may be stored in a specific location (for example, memory), or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated or appended. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to other devices.
- Uplink Control Information (UCI) Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may also be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like.
- RRC signaling may also be called an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.
- MAC signaling may be notified using, for example, a MAC Control Element (CE).
- CE MAC Control Element
- notification of predetermined information is not limited to explicit notification, but implicit notification (for example, by not notifying the predetermined information or by providing another information by notice of
- the determination may be made by a value (0 or 1) represented by 1 bit, or by a boolean value represented by true or false. , may be performed by numerical comparison (eg, comparison with a predetermined value).
- Software whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) , a server, or other remote source, these wired and/or wireless technologies are included within the definition of transmission media.
- a “network” may refer to devices (eg, base stations) included in a network.
- precoding "precoding weight”
- QCL Quality of Co-Location
- TCI state Transmission Configuration Indication state
- spatialal patial relation
- spatialal domain filter "transmission power”
- phase rotation "antenna port
- antenna port group "layer”
- number of layers Terms such as “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, “panel” are interchangeable. can be used as intended.
- base station BS
- radio base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission Point (TP)”, “Reception Point (RP)”, “Transmission/Reception Point (TRP)”, “Panel”
- a base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.
- a base station can accommodate one or more (eg, three) cells.
- the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is assigned to a base station subsystem (e.g., a small indoor base station (Remote Radio)). Head (RRH))) may also provide communication services.
- a base station subsystem e.g., a small indoor base station (Remote Radio)). Head (RRH)
- RRH Head
- the terms "cell” or “sector” refer to part or all of the coverage area of at least one of the base stations and base station subsystems that serve communication within such coverage.
- MS Mobile Station
- UE User Equipment
- Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , a handset, a user agent, a mobile client, a client, or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like.
- the mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ).
- at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.
- at least one of the base station and mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read as a user terminal.
- communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.)
- the user terminal 20 may have the functions of the base station 10 described above.
- words such as "uplink” and “downlink” may be replaced with words corresponding to communication between terminals (for example, "sidelink”).
- uplink channels, downlink channels, etc. may be read as sidelink channels.
- user terminals in the present disclosure may be read as base stations.
- the base station 10 may have the functions of the user terminal 20 described above.
- operations that are assumed to be performed by the base station may be performed by its upper node in some cases.
- various operations performed for communication with a terminal may involve the base station, one or more network nodes other than the base station (e.g., Clearly, this can be done by a Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. (but not limited to these) or a combination thereof.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching along with execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG xG (xG (x is, for example, an integer or a decimal number)
- Future Radio Access FAA
- RAT New - Radio Access Technology
- NR New Radio
- NX New radio access
- FX Future generation radio access
- GSM registered trademark
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi®
- IEEE 802.16 WiMAX®
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth®, or other suitable wireless It may be applied to systems using communication methods, next-generation systems extended based on these, and the like. Also, multiple systems may be applied to systems using communication methods, next-generation systems extended based on these, and the like
- any reference to elements using the "first,” “second,” etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.
- determining includes judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry ( For example, looking up in a table, database, or another data structure), ascertaining, etc. may be considered to be “determining.”
- determining (deciding) includes receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access ( accessing (e.g., accessing data in memory), etc.
- determining is considered to be “determining” resolving, selecting, choosing, establishing, comparing, etc. good too. That is, “determining (determining)” may be regarded as “determining (determining)” some action.
- Maximum transmit power described in this disclosure may mean the maximum value of transmit power, may mean the nominal maximum transmit power (the nominal UE maximum transmit power), or may mean the rated maximum transmit power (the rated UE maximum transmit power).
- connection refers to any connection or coupling, direct or indirect, between two or more elements. and can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other. Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection” may be read as "access”.
- radio frequency domain when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, radio frequency domain, microwave They can be considered to be “connected” or “coupled” together using the domain, electromagnetic energy having wavelengths in the optical (both visible and invisible) domain, and the like.
- a and B are different may mean “A and B are different from each other.”
- the term may also mean that "A and B are different from C”.
- Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”
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Abstract
Description
NRでは、送信設定指示状態(Transmission Configuration Indication state(TCI状態))に基づいて、信号及びチャネルの少なくとも一方(信号/チャネルと表現する)のUEにおける受信処理(例えば、受信、デマッピング、復調、復号の少なくとも1つ)、送信処理(例えば、送信、マッピング、プリコーディング、変調、符号化の少なくとも1つ)を制御することが検討されている。
・QCLタイプA(QCL-A):ドップラーシフト、ドップラースプレッド、平均遅延及び遅延スプレッド、
・QCLタイプB(QCL-B):ドップラーシフト及びドップラースプレッド、
・QCLタイプC(QCL-C):ドップラーシフト及び平均遅延、
・QCLタイプD(QCL-D):空間受信パラメータ。
NRでは、1つ又は複数の送受信ポイント(Transmission/Reception Point(TRP))(マルチTRP(multi TRP(MTRP)))が、1つ又は複数のパネル(マルチパネル)を用いて、UEに対してDL送信を行うことが検討されている。また、UEが、1つ又は複数のTRPに対して、1つ又は複数のパネルを用いて、UL送信を行うことが検討されている。
[条件1]
1のCORESETプールインデックスが設定される。
[条件2]
CORESETプールインデックスの2つの異なる値(例えば、0及び1)が設定される。
[条件]
DCI内のTCIフィールドの1つのコードポイントに対する1つ又は2つのTCI状態を指示するために、「UE固有PDSCH用拡張TCI状態アクティベーション/ディアクティベーションMAC CE(Enhanced TCI States Activation/Deactivation for UE-specific PDSCH MAC CE)」が用いられる。
NRにおいて、無線リンクモニタリング(Radio Link Monitoring(RLM))が利用される。
もし、UEがRLM-RS(RadioLinkMonitoringRS)を提供されず、且つUEがPDCCH受信用に1以上のCSI-RSを含むTCI状態を提供された場合、UEは、以下の手順1から4に従う。
もしPDCCH受信用のアクティブTCI状態が1つのRSのみを含む場合、UEは、PDCCH受信用のアクティブTCI状態用に提供されたそのRSをRLMに用いる。
[[手順2]]
もしPDCCH受信用のアクティブTCI状態が2つのRSを含む場合、UEは、1つのRSがQCLタイプDを有すると想定し、UEは、QCLタイプDを有するそのRSをRLMに用いる。UEは、両方のRSがQCLタイプDを有すると想定しない。
[[手順3]]
UEは、非周期的(aperiodic)又はセミパーシステント(semi-persistent)のRSをRLMに用いることを必要とされない。
[[手順4]]
Lmax=4に対して、UEは、最小のモニタリング周期(periodicity)からの順に、複数のサーチスペースセットに関連付けられた複数のCORESET内において、PDCCH受信用のアクティブTCI状態用に提供されたNRLM個のRSを選択する。もし1より多いCORESETが、同じモニタリング周期を有する複数のサーチスペースセットに関連付けられている場合、UEは、最高のCORESETインデックスからのCORESETの順を決定する。
NRでは、ビームフォーミングを利用して通信を行う。例えば、UE及び基地局(例えば、gNB(gNodeB))は、信号の送信に用いられるビーム(送信ビーム、Txビームなどともいう)、信号の受信に用いられるビーム(受信ビーム、Rxビームなどともいう)を用いてもよい。
BFが検出された場合、UEから、PCell/PSCellに対して、PUCCH-BFR(スケジューリング要求(SR))が送信されてもよい。次いで、PCell/PSCellから、UEに対して、下記ステップ2のためのULグラント(DCI)が送信されてもよい。ビーム障害が検出された場合に、新候補ビームに関する情報を送信するためのMAC CE(又は、UL-SCH)が存在する場合には、ステップ1(例えば、PUCCH送信)を省略して、ステップ2(例えば、MAC CE送信)を行ってもよい。
次いで、UEは、ビーム障害が検出された(失敗した)セルに関する情報(例えば、セルインデックス)及び新候補ビームに関する情報を、MAC CEを用いて、上りリンクチャネル(例えば、PUSCH)を介して、基地局(PCell/PSCell)に送信してもよい。その後、BFR手順を経て、基地局からの応答信号を受信してから所定期間(例えば、28シンボル)後に、PDCCH/PUCCH/PDSCH/PUSCHのQCLが、新たなビームに更新されてもよい。
Rel.16において、1つのサービングセルの各BWPに対し、UEは、障害検出リソース(failureDetectionResources、failureDetectionResourcesToAddModList、RadioLinkMonitoringConfig)によって周期的(P)-CSI-RSリソース設定インデックスのセットq0バーと、候補ビームRSリスト(candidateBeamRSList)又は拡張候補ビームRSリスト(candidateBeamRSListExt-r16)又はSCell用候補ビームRSリスト(candidateBeamRSSCellList-r16)によって、P-CSI-RSリソース設定インデックス及びSS/PBCHブロックインデックスの少なくとも1つのセットq1バーと、を提供されることができる。
UEは、UEがPDCCHのモニタリングに用いる、対応するCORESETに対するTCI状態(TCI-State)によって指示されるRSセット内のRSインデックスと同じ値を有するP-CSI-RSリソース設定インデックスを、セットq0に含めることを決定する。もし1つのTCI状態内に2つのRSインデックスがある場合、セットq0が、対応するTCI状態に対してQCLタイプD設定を有するRSインデックスを含む。UEは、そのセットq0が2つまでのRSインデックスを含むと想定する。UEは、そのセットq0内においてシングルポートRSを想定する。
Rel.17以降では、複数TRPでのビーム障害検出において、TRPごと独立したBFD-RSの設定が導入されることが検討されている。ここで、各TRPは、1以上のBFD-RSと関連付けられてもよい。
本開示において、トータル/ファイナルBFD-RSセット数/NBI-RSセット数が、明示的な設定によって決定されてもよいし、暗示的な決定ルールによって決定されてもよい。
あるCCにおける、TRPごとのBFRに対する、トータルのBFD-RSセット数と、トータルのNBI-RSセット数と、の組み合わせが、設定/決定されてもよい。
ケース0-0においては、以下のオプション1-1及びオプション1-2の少なくとも一方にしたがってもよい。
トータルBFD-RSセット数が0であることは許容されなくてもよい。明示的なBFD-RS(セット)の設定がない場合、暗示的な決定ルールが適用されるためである。
特定の周波数レンジ(例えば、FR2)におけるあるCCに対して、BFD-RSセット数が0であることが許容されてもよい。UEは、特定の周波数レンジ(例えば、FR2)におけるあるCCにおいて、トータルBFD-RSセット数が0となることを想定/期待してもよい。
ケース1-0においては、以下のオプション2-1及びオプション2-2の少なくとも一方にしたがってもよい。
BFRに対し、1つのBFD-RSセットが設定され、NBI-RSセットが設定/決定されないことは許容されなくてもよい。
1つのBFD-RSセットが設定/決定されるとき、NBI-RSは設定/決定されなくてもよい。
ケース1-1においては、上述のケース1-0における、オプション2-2-2に記載した方法に従ってもよい。オプション2-2-2については、すでに上述しているため、ここでは割愛する。
ケース2-0においては、以下のオプション3-1及びオプション3-2の少なくとも一方にしたがってもよい。
BFRに対し、2つのBFD-RSセットが設定され、NBI-RSセットが設定/決定されないことは許容されなくてもよい。
2つのBFD-RSセットが設定/決定されるとき、NBI-RSは設定/決定されなくてもよい。オプション3-2は、オプション2-2に記載した態様を流用してもよい。
ケース2-1においては、以下のオプション4-1及びオプション4-2の少なくとも一方にしたがってもよい。
BFRに対し、2つのBFD-RSセットが設定され、1つのNBI-RSセットが設定/決定されることは許容されなくてもよい。
2つのBFD-RSセットが設定/決定されるとき、1つのNBI-RSセットが設定/決定されてもよい。オプション4-2では、上述したオプション3-1-1における態様が流用されてもよい。
第2の実施形態では、NBI-RSセットの暗示的な決定/導出方法について説明する。UEは、NBI-RSセットが明示的に設定されないとき、特定のルールに基づいてNBI-RSセットを導出/決定してもよい。
第3の実施形態では、明示的に設定されるBFD-RSセットの数/暗示的に決定されるBFD-RSセットの数/NBI-RSセット数について説明する。
以上の複数の実施形態の少なくとも1つにおける機能(特徴、feature)に対応する上位レイヤパラメータ(RRC IE)/UE能力(capability)が規定されてもよい。UE能力は、この機能をサポートすることを示してもよい。
以下、本開示の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本開示の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図6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7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)
- 0以上のビーム障害検出用参照信号(BFD-RS)セットの設定及び0以上のBFD-RSセットの決定の少なくとも一方と、0以上の新規ビーム識別用参照信号(NBI-RS)セットの設定及び0以上のNBI-RSセットの決定の少なくとも一方と、を想定する制御部と、
前記想定に基づいて決定される、前記BFD-RSセットに含まれる1以上のBFD-RSと、前記NBI-RSセットに含まれる1以上のNBI-RSと、の少なくとも1つを受信する受信部と、を有する端末。 - 前記制御部は、設定されるBFD-RSセットの数と決定するBFD-RSセットの数との合計数が、設定されるNBI-RSセットの数と決定するNBI-RSセットの数との合計数以上であることを想定する、請求項1に記載の端末。
- 前記受信部は、前記BFD-RSセットの決定及び前記NBI-RSセットの決定の少なくとも一方を有効にする上位レイヤパラメータを受信する、請求項1に記載の端末。
- 前記制御部は、上位レイヤシグナリングで設定される同期信号ブロックに関するインデックス及びチャネル状態情報参照信号に関するインデックスの少なくとも1つに基づいて、前記NBI-RSセットの決定を行う請求項1に記載の端末。
- 0以上のビーム障害検出用参照信号(BFD-RS)セットの設定及び0以上のBFD-RSセットの決定の少なくとも一方と、0以上の新規ビーム識別用参照信号(NBI-RS)セットの設定及び0以上のNBI-RSセットの決定の少なくとも一方と、を想定するステップと、
前記想定に基づいて決定される、前記BFD-RSセットに含まれる1以上のBFD-RSと、前記NBI-RSセットに含まれる1以上のNBI-RSと、の少なくとも1つを受信するステップと、を有する端末の無線通信方法。 - 0以上のビーム障害検出用参照信号(BFD-RS)セットの設定及び0以上のBFD-RSセットの決定の少なくとも一方と、0以上の新規ビーム識別用参照信号(NBI-RS)セットの設定及び0以上のNBI-RSセットの決定の少なくとも一方と、を想定する制御部と、
前記想定に基づいて決定される、前記BFD-RSセットに含まれる1以上のBFD-RSと、前記NBI-RSセットに含まれる1以上のNBI-RSと、の少なくとも1つを送信する送信部と、を有する基地局。
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Non-Patent Citations (3)
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"Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8", 3GPP TS 36.300, April 2010 (2010-04-01) |
INTERDIGITAL, INC.: "Discussion on M-TRP Beam Management Enhancements", 3GPP DRAFT; R1-2100066, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210125 - 20210205, 17 January 2021 (2021-01-17), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051968874 * |
MODERATOR (CATT): "Moderator summary #1 on M-TRP simultaneous transmission with multiple Rx panels", 3GPP DRAFT; R1-2103858, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210412 - 20210420, 13 April 2021 (2021-04-13), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051995274 * |
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