WO2022149275A1 - 端末、無線通信方法及び基地局 - Google Patents
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Definitions
- This disclosure relates to terminals, wireless communication methods and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- UMTS Universal Mobile Telecommunications System
- 3GPP Rel.10-14 LTE-Advanced (3GPP Rel.10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).
- a successor system to LTE for example, 5th generation mobile communication system (5G), 5G + (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 or later, etc.
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- the terminal performs radio link monitoring (RLM) / beam failure detection (BFD).
- RLM radio link monitoring
- BFD beam failure detection
- one of the purposes of the present disclosure is to provide a terminal, a wireless communication method, and a base station that appropriately perform at least one of RLM and BFD.
- the terminal includes a receiving unit that receives a medium access control-control element (MAC CE) indicating two active transmission configuration indicators (TCI) states for one control resource set, and a radio link monitoring (RLM). ) A control unit that uses the reference signal in at least one TCI state of the two active TCI states for the RLM when the information element of the reference signal is not provided.
- MAC CE medium access control-control element
- TCI transmission configuration indicators
- RLM radio link monitoring
- At least one of RLM and BFD can be appropriately performed.
- FIG. 1 is a diagram showing an example of the number of RLM-RS.
- FIG. 2 is a diagram showing an example of a beam recovery procedure.
- 3A to 3C are diagrams showing an example of RLM-RS according to the first embodiment.
- 4A to 4C are diagrams showing an example of BFD-RS according to the second embodiment.
- 5A and 5B are diagrams showing an example of BFD-RS according to the third embodiment.
- FIG. 6 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 7 is a diagram showing an example of the configuration of the base station according to the embodiment.
- FIG. 8 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
- FIG. 9 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- reception processing eg, reception, demapping, demodulation, etc.
- transmission processing eg, at least one of transmission, mapping, precoding, modulation, and coding
- the TCI state may represent what applies to the downlink signal / channel.
- the equivalent of the TCI state applied to the uplink signal / channel may be expressed as a spatial relation.
- the TCI state is information related to signal / channel pseudo collocation (Quasi-Co-Location (QCL)), and may be called spatial reception parameters, spatial relation information, or the like.
- QCL Quality of Service
- the TCI state may be set in the UE per channel or per signal.
- QCL is an index showing the statistical properties of signals / channels. For example, when one signal / channel and another signal / channel have a QCL relationship, Doppler shift, Doppler spread, and average delay are performed between these different signals / channels. ), Delay spread, and spatial parameter (for example, spatial Rx parameter) can be assumed to be the same (QCL for at least one of these). You may.
- the spatial reception parameter may correspond to the received beam of the UE (for example, the received analog beam), or the beam may be specified based on the spatial QCL.
- the QCL (or at least one element of the QCL) in the present disclosure may be read as sQCL (spatial QCL).
- QCL types A plurality of types (QCL types) may be specified for the QCL.
- QCL types AD QCL types with different parameters (or parameter sets) that can be assumed to be the same may be provided, and the parameters (may be referred to as QCL parameters) are shown below: QCL type A (QCL-A): Doppler shift, Doppler spread, average delay and delay spread, -QCL type B (QCL-B): Doppler shift and Doppler spread, QCL type C (QCL-C): Doppler shift and average delay, -QCL type D (QCL-D): Spatial reception parameter.
- QCL-A Doppler shift, Doppler spread, average delay and delay spread
- -QCL type B QCL type B
- QCL type C QCL type C
- QCL-D Spatial reception parameter.
- the UE assumes that one control resource set (Control Resource Set (CORESET)) has a specific QCL (eg, QCL type D) relationship with another CORESET, channel or reference signal. It may be called a QCL assumption.
- CORESET Control Resource Set
- QCL QCL type D
- the UE may determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI state of the signal / channel or the QCL assumption.
- the TCI state may be, for example, information about the QCL of the target channel (in other words, the reference signal (Reference Signal (RS)) for the channel) and another signal (for example, another RS). ..
- the TCI state may be set (instructed) by higher layer signaling, physical layer signaling, or a combination thereof.
- the physical layer signaling may be, for example, downlink control information (DCI).
- DCI downlink control information
- the channels for which the TCI state or spatial relationship is set are, for example, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), and an uplink shared channel (Physical Uplink Shared). It may be at least one of a Channel (PUSCH)) and an uplink control channel (Physical Uplink Control Channel (PUCCH)).
- PDSCH Physical Downlink Shared Channel
- PDCH Downlink Control Channel
- PUSCH Physical Uplink Control Channel
- PUCCH Physical Uplink Control Channel
- the RS having a QCL relationship with the channel is, for example, a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a measurement reference signal (Sounding). It may be at least one of Reference Signal (SRS)), CSI-RS for tracking (also referred to as Tracking Reference Signal (TRS)), and reference signal for QCL detection (also referred to as QRS).
- SSB Synchronization Signal Block
- CSI-RS Channel State Information Reference Signal
- Sounding Sounding
- SRS Reference Signal
- TRS Tracking Reference Signal
- QRS reference signal for QCL detection
- the SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a broadcast channel (Physical Broadcast Channel (PBCH)).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- PBCH Physical Broadcast Channel
- the SSB may be referred to as an SS / PBCH block.
- the RS of the QCL type X in the TCI state may mean an RS having a relationship between a certain channel / signal (DMRS) and the QCL type X, and this RS is called the QCL source of the QCL type X in the TCI state. You may.
- DMRS channel / signal
- the QCL type A RS may always be set for the PDCCH and PDSCH, and the QCL type D RS may be additionally set. Since it is difficult to estimate Doppler shift, delay, etc. by receiving one shot of DMRS, QCL type A RS is used to improve the channel estimation accuracy.
- the QCL type D RS is used to determine the received beam when receiving a DMRS.
- TRS1-1, 1-2, 1-3, 1-4 are transmitted, and TRS1-1 is notified as QCL type C / D RS according to the TCI status of PDSCH.
- the UE can use the information obtained from the result of the past periodic reception / measurement of TRS1-1 for the reception / channel estimation of the DMRS for PDSCH.
- the QCL source of the PDSCH is TRS1-1
- the QCL target is the DMRS for PDSCH.
- Multi TRP In the NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP (multi TRP (MTRP))) are used for the UE using one or more panels (multi-panel). It is being considered to perform DL transmission. Further, it is considered that the UE performs UL transmission to one or a plurality of TRPs by using one or a plurality of panels.
- TRP Transmission / Reception Point
- MTRP multi TRP
- UE performs UL transmission to one or a plurality of TRPs by using one or a plurality of panels.
- the plurality of TRPs may correspond to the same cell identifier (cell Identifier (ID)) or may correspond to different cell IDs.
- the cell ID may be a physical cell ID or a virtual cell ID.
- the multi-TRP (for example, TRP # 1 and # 2) may be connected by an ideal / non-ideal backhaul, and information, data, etc. may be exchanged.
- Different code words Code Word (CW)
- CW Code Word
- Different layers may be transmitted from each TRP of the multi-TRP.
- NJT non-coherent joint transmission
- TRP # 1 modulation-maps the first codeword, layer-maps it, and transmits the first PDSCH to the first number of layers (eg, the second layer) using the first precoding.
- TRP # 2 modulation-maps the second codeword, layer-maps the second codeword, and transmits the second PDSCH to the second number of layers (for example, the second layer) using the second precoding.
- the plurality of PDSCHs (multi-PDSCHs) to be NCJT may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap at least one of the time and frequency resources.
- first PDSCH and second PDSCH may be assumed to be not quasi-co-located in a pseudo-collocation (Quasi-Co-Location (QCL)) relationship.
- the reception of the multi-PDSCH may be read as the simultaneous reception of PDSCHs that are not of a certain QCL type (for example, QCL type D).
- Multiple PDSCHs from multiple TRPs may be scheduled using one DCI (single DCI, single PDCCH) (based on single master mode, single DCI).
- Multi TRP single-DCI based multi-TRP.
- Multiple PDSCHs from a multi-TRP may be scheduled using multiple DCIs (multi-DCI, multi-PDCCH (multiple PDCCH)), respectively (multi-master mode, multi-DCI based multi-). TRP)).
- PDSCH transport block (TB) or codeword (CW) repetition (repetition) across multi-TRP.
- URLLC schemes URLLC schemes, eg, schemes 1, 2a, 2b, 3, 4
- SDM space division multiplexing
- FDM frequency division multiplexing
- RV redundant version
- the RV may be the same or different for the multi-TRP.
- the multi-PDSCH from the multi-TRP is time division multiplexing (TDM).
- TDM time division multiplexing
- the multi-PDSCH from the multi-TRP is transmitted in one slot.
- the multi-PDSCH from the multi-TRP is transmitted in different slots.
- one control resource set (CORESET) in the PDCCH setting information (PDCCH-Config) may correspond to one TRP.
- the UE may determine that it is a multi-TRP based on a multi-DCI.
- TRP may be read as a CORESET pool index.
- a CORESET pool index of 1 is set.
- Two different values of the CORESET pool index are set.
- the UE may determine that it is a multi-TRP based on a single DCI.
- the two TRPs may be read as the two TCI states indicated by MAC CE / DCI.
- [conditions] To indicate one or two TCI states for one code point in the TCI field in the DCI, "Enhanced TCI States Activation / Deactivation for UE- specific PDSCH MAC CE) ”is used.
- the DCI for common beam instruction may be a UE-specific DCI format (for example, DL DCI format (for example, 1_1, 1-2), UL DCI format (for example, 0_1, 0_2)), or may be common to UE-groups (UE-group). common) It may be in DCI format.
- Radio Link Monitoring In NR, Radio Link Monitoring (RLM) is used.
- the base station may set a radio link monitoring reference signal (Radio Link Monitoring RS (RLM-RS)) for each BWP for the UE by using higher layer signaling.
- RLM-RS Radio Link Monitoring Reference Signal
- the UE may receive configuration information for the RLM (eg, the RRC's "RadioLink MonitoringConfig" information element).
- the setting information for the RLM may include failure detection resource setting information (for example, "failureDetectionResourcesToAddModList" of the upper layer parameter).
- the failure detection resource setting information may include parameters related to RLM-RS (for example, the upper layer parameter "RadioLink Monitoring RS").
- the parameters related to RLM-RS are information indicating that they correspond to the purpose of RLM, and an index included in the index corresponding to the resource of RLM-RS (for example, "failureDetectionResources" (RadioLinkMonitoringRS in FailureDetectionResourcesToAddModList) of the upper layer parameter). ) Etc. may be included.
- the index may be, for example, an index set for the CSI-RS resource (for example, a 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 specify the RLM-RS resource based on the index corresponding to the resource of the RLM-RS, and execute the RLM using the RLM-RS resource.
- the UE follows the procedure below.
- the UE If the UE is not provided with RLM-RS (RadioLinkMonitoringRS) and the UE is provided with a TCI state containing one or more CSI-RSs for PDCCH reception, the UE follows steps 1 through 4 below.
- RLM-RS RadioLinkMonitoringRS
- L max is the maximum number of SS / PBCH block indexes in the cell.
- the maximum number of SS / PBCH blocks transmitted within a half frame is L max .
- the UE makes an implicit RLM-RS decision and uses the active TCI state for PDCCH reception for the RLM.
- L max 4
- the UE first selects N RLM RSs in ascending order of the search space set monitoring cycle and then in descending order of the CORESET index. Select CORESET.
- a UE and a base station are a beam used for transmitting a signal (also referred to as a transmission beam, a Tx beam, etc.) and a beam used for receiving a signal (also referred to as a reception beam, an Rx beam, etc.). ) May be used.
- RadioLink Failure (RadioLink Failure (RLF)
- RLF RadioLink Failure
- BFR Beam Failure Recovery
- L1 / L2 Layer 1 / Layer 2
- the beam failure (BF) in the present disclosure may be referred to as a link failure.
- FIG. 2 shows Rel. 15 It is a figure which shows an example of the beam recovery procedure in NR.
- the number of beams is an example and is not limited to this.
- the UE performs a measurement based on a reference signal (RS) resource transmitted using the two beams.
- RS reference signal
- the RS may be at least one of a synchronization signal block (Synchronization Signal Block (SSB)) and an RS for channel state measurement (Channel State Information RS (CSI-RS)).
- SSB may be referred to as an SS / PBCH (Physical Broadcast Channel) block or the like.
- 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 the SSB, SSB, CSI-RS, and demodulation. It may be at least one of a reference signal (DeModulation Reference Signal (DMRS)), a beam-specific signal, or a signal configured by expanding or changing these.
- DMRS DeModulation Reference Signal
- the RS measured in step S101 is RS (Beam Failure Detection RS (BFD-RS), RS for beam failure detection) for beam failure detection, RS (BFR-RS) for use in the beam recovery procedure, and the like. May be called.
- step S102 the UE cannot detect BFD-RS (or the reception quality of RS deteriorates) because the radio wave from the base station is disturbed.
- Such interference can occur, for example, due to the effects of obstacles, fading, interference, etc. between the UE and the base station.
- the UE detects a beam failure when a predetermined condition is met. For example, the UE may detect the occurrence of a beam failure when the BLER (Block Error Rate) is less than the threshold value for all of the set BFD-RS (BFD-RS resource settings). When the occurrence of a beam failure is detected, the lower layer (physical (PHY) layer) of the UE may notify (instruct) the beam failure instance to the upper layer (MAC layer).
- BLER Block Error Rate
- MAC layer physical (physical (PHY) layer) of the UE may notify (instruct) the beam failure instance to the upper layer (MAC layer).
- the criterion (criteria) for judgment is not limited to BLER, and may be the reference signal reception power (Layer 1 Reference Signal Received Power (L1-RSRP)) in the physical layer. Further, instead of RS measurement or in addition to RS measurement, beam failure detection may be performed based on a downlink control channel (Physical Downlink Control Channel (PDCCH)) or the like.
- the BFD-RS may be expected to be a PDCCH DMRS and pseudo-collocation (Quasi-Co-Location (QCL)) monitored by the UE.
- the QCL is an index showing the statistical properties of the channel. For example, when one signal / channel and another signal / channel have a QCL relationship, a Doppler shift, a Doppler spread, and an average delay are performed between these different signals / channels. ), Delay spread, Spatial parameter (for example, Spatial Rx Parameter) can be assumed to be the same (QCL for at least one of these). You may.
- the spatial reception parameter may correspond to the received beam of the UE (for example, the received analog beam), or the beam may be specified based on the spatial QCL.
- the QCL (or at least one element of the QCL) in the present disclosure may be read as sQCL (spatial QCL).
- BFD-RS eg, RS index, resource, number, number of ports, precoding, etc.
- BFD beam fault detection
- Information on BFD-RS may be referred to as information on resources for BFR.
- the upper layer of the UE may start a predetermined timer (which may be called a beam failure detection timer) when the beam failure instance notification is received from the PHY layer of the UE.
- a predetermined timer which may be called a beam failure detection timer
- the MAC layer of the UE receives a beam failure instance notification a certain number of times (for example, beamFailureInstanceMaxCount set by RRC) or more before the timer expires, it triggers BFR (for example, one of the random access procedures described later) is started. ) May.
- 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 (new candidate beam) to be newly used for communication in order to recover the beam.
- the UE may select a new candidate beam corresponding to a predetermined RS by measuring the predetermined RS.
- the RS measured in step S103 is called a new candidate RS, an RS for identifying a new candidate beam (New Candidate Beam Identification RS (NCBI-RS)), a CBI-RS, a CB-RS (Candidate Beam RS), or the like. May be.
- NCBI-RS may be the same as or different from BFD-RS.
- the new candidate beam may be simply referred to as a candidate beam or a candidate RS.
- the UE may determine a beam corresponding to RS satisfying a predetermined condition as a new candidate beam.
- the UE may determine a new candidate beam based on, for example, the RS of the configured NCBI-RS in which L1-RSRP exceeds the threshold value.
- the criteria (criteria) for judgment are not limited to L1-RSRP.
- L1-RSRP regarding SSB may be referred to as SS-RSRP.
- L1-RSRP for CSI-RS may be referred to as CSI-RSRP.
- NCBI-RS eg, RS resources, number, number of ports, precoding, etc.
- NCBI new candidate beam identification
- Information about the new candidate RS may be obtained based on information about BFD-RS.
- Information about NCBI-RS may be referred to as information about resources for NBCI.
- BFD-RS may be read as a radio link monitoring reference signal (Radio Link Monitoring RS (RLM-RS)).
- RLM-RS Radio Link Monitoring RS
- the UE that has identified the new candidate beam in step S104 transmits a beam recovery request (Beam Failure Recovery reQuest (BFRQ)).
- the beam recovery request may be referred to as a beam recovery request signal, a beam failure recovery request signal, or the like.
- BFRQ is, for example, uplink control channel (Physical Uplink Control Channel (PUCCH)), random access channel (Physical Random Access Channel (PRACH)), uplink shared channel (Physical Uplink Shared Channel (PUSCH)), configure (setting). It may be transmitted using at least one of the configured grant (CG) PUSCHs.
- PUCCH Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- PUSCH Physical Uplink Shared Channel
- the BFRQ may include information on the new candidate beam / new candidate RS specified in step S103.
- Resources for BFRQ may be associated with the new candidate beam.
- the beam information includes a beam index (Beam Index (BI)), a port index of a predetermined reference signal, an RS index, a resource index (for example, CSI-RS Resource Indicator (CRI)), and an SSB resource index. (SSBRI)) may be notified.
- BI Beam Index
- RS index for example, CSI-RS Resource Indicator (CRI)
- SSBRI SSB resource index.
- CB-BFR Contention-Based BFR
- CF-BFR Contention-Free BFR
- the UE may transmit a preamble (also referred to as RA preamble, Random Access Channel (PRACH), RACH preamble, etc.) as a BFRQ using the PRACH resource.
- RA Random Access Channel
- PRACH Random Access Channel
- the UE may transmit a preamble randomly selected from one or more preambles.
- the UE may transmit a preamble assigned uniquely to the UE from the base station.
- the base station may assign the same preamble to a plurality of UEs.
- the base station may assign a preamble to each UE.
- the CB-BFR and CF-BFR are CB PRACH-based BFR (contention-based PRACH-based BFR (CBRA-BFR)) and CF PRACH-based BFR (contention-free PRACH-based BFR (CFRA-BFR)), respectively. May be called.
- CBRA-BFR may be referred to as CBRA for BFR.
- CFRA-BFR may be referred to as CFRA for BFR.
- information on the PRACH resource may be notified by, for example, higher layer signaling (RRC signaling or the like).
- RRC signaling higher layer signaling
- the information may include information indicating the correspondence between the detected DL-RS (beam) and the PRACH resource, or a different PRACH resource may be associated with each DL-RS.
- the base station that has 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 reconstruction information for one or more beams (eg, DL-RS resource configuration information).
- the response signal may be transmitted, for example, in the UE common search space of PDCCH.
- the response signal is notified using a PDCCH (DCI) scrambled by a cyclic redundancy check (Cyclic Redundancy Check (CRC)) by a UE identifier (for example, Cell-Radio RNTI (C-RNTI)). May be done.
- DCI PDCCH
- C-RNTI Cell-Radio RNTI
- the UE may monitor the response signal based on at least one of the control resource set for BFR (COntrol REsource SET (CORESET)) and the search space set for BFR.
- control resource set for BFR COntrol REsource SET (CORESET)
- search space set for BFR the search space set for BFR.
- CB-BFR when the UE receives the PDCCH corresponding to C-RNTI related to itself, it may be determined that the contention resolution is successful.
- a period for the UE to monitor the response from the base station (for example, gNB) to the BFRQ may be set.
- the period may be referred to as, for example, a gNB response window, a gNB window, a beam recovery request response window, or the like.
- the UE may retransmit the BFRQ if there is no gNB response detected within the window period.
- the UE may send a message to the base station indicating that the beam reconstruction is completed.
- the message may be transmitted by, for example, PUCCH or PUSCH.
- Successful beam recovery may represent, for example, the case where step S106 is reached.
- the beam recovery failure may correspond to, for example, that the BFRQ transmission has reached a predetermined number of times, or the beam failure recovery timer (Beam-failure-recovery-Timer) has expired.
- Rel. In 15 it is supported to perform a beam recovery procedure (for example, notification of BFRQ) for a beam failure detected by SpCell (PCell / PSCell) by using a random access procedure.
- a beam recovery procedure for example, notification of BFRQ
- the beam recovery procedure for example, notification of BFRQ
- the beam failure detected by SCell is transmitted by PUCCH (for example, scheduling request (SR)) for BFR and MAC CE for BFR (for example, UL-SCH).
- PUCCH for example, scheduling request (SR)
- MAC CE for BFR
- the UE may use two MAC CE-based steps to transmit information about beam faults.
- the information regarding the beam failure may include information about the cell in which the beam failure is detected and information about the new candidate beam (or the new candidate RS index).
- Step 1 When BF is detected, PUCCH-BFR (Scheduling Request (SR)) may be transmitted from the UE to PCell / PSCell.
- the UL grant (DCI) for step 2 below may be transmitted from the PCell / PSCell to the UE.
- step 1 for example, PUCCH transmission
- step 2 is performed.
- MAC CE transmission For example, MAC CE transmission
- the UE uses MAC CE to provide information about the cell in which the beam failure was detected (eg, cell index) and the new candidate beam via the uplink channel (eg, PUSCH). It may be transmitted to a base station (PCell / PSCell). Then, after a predetermined period (for example, 28 symbols) after receiving the response signal from the base station via the BFR procedure, the QCL of PDCCH / PUCCH / PDSCH / PUSCH may be updated to a new beam.
- a predetermined period for example, 28 symbols
- BFD-RS (BFD-RS) Rel.
- the UE has a periodic (P) -CSI-RS resource configuration index set q 0 bar and a candidate beam RS list (failureDetectionResources, failureDetectionResourcesToAddModList, RadioLinkMonitoringConfig).
- P periodic
- a candidate beam RS list (failureDetectionResources, failureDetectionResourcesToAddModList, RadioLinkMonitoringConfig).
- candidateBeamRSList or extended candidate beam RS list
- candidate BeamRSListExt-r16 candidate beam RS list for SCell
- the q 0 bar is a notation in which "q 0 " is overlined.
- the q 0 bar is simply referred to as q 0 .
- the q 1 bar is a notation with an overline on "q 1 ".
- the q 1 bar is simply referred to as q 1 .
- the set q 0 of P-CSI-RS resources provided by the fault detection resource may be referred to as explicit BFD-RS.
- the UE may perform L1-RSRP measurements and the like using the RS resources corresponding to the indexes contained in at least one set of set q 0 and set q 1 to detect beam faults.
- providing the above-mentioned upper layer parameter indicating the index information corresponding to the BFD resource is read as the setting of the BFD resource, the setting of the BFD-RS, and the like. May be.
- the BFD resource, the periodic CSI-RS resource setting index or the SSB index set q 0 , the BFD-RS, the BFD-RS set, and the RS set may be read as each other.
- the UE If the UE is not provided with q 0 by failureDetectionResources for one BWP of its serving cell, it is indicated by the TCI-State for the corresponding CORESET that the UE uses to monitor the PDCCH. Determines to include the P-CSI-RS resource configuration index with the same value as the RS index in the RS set in set q 0 . If there are two RS indexes in one TCI state, set q 0 contains an RS index with a QCL type D setting for the corresponding TCI state. The UE assumes that its set q 0 contains up to two RS indexes. The UE assumes a single port RS within its set q 0 .
- This set q 0 may be referred to as implicit BFD-RS.
- the UE determines the BFD-RS (RS set) according to the TCI state for PDCCH.
- the UE assumes that its RS set contains up to two RSs.
- the UE selects N RLM RSs based on the order of the monitoring cycle of the search space set and the order of the CORESET index and (rules).
- the RLM-RS when two TCI states are activated for CORESET determined based on this rule is not clear. For example, in this case, the question is whether one TCI state is used for RLM or both RSs are used for RLM.
- the UE assumes that its RS set contains up to two RSs.
- the BFD-RS when two TCI states are activated for CORESET is not clear. For example, it is not clear whether it is supported that the number of RSs in the active TCI state of CORESET is greater than 2. If it is supported, it is not clear how RS for BFD will be selected.
- the present inventors have conceived a method for determining RS for RLM / BFD.
- a / B / C and “at least one of A, B and C” may be read interchangeably.
- the cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as each other.
- the index, the ID, the indicator, and the resource ID may be read as each other.
- support, control, controllable, working, working may be read interchangeably.
- configuration, activate, update, indicate, enable, specify, and select may be read as each other.
- the upper layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- RRC, RRC signaling, RRC parameters, higher layers, higher layer parameters, RRC information elements (IE), and RRC messages may be read interchangeably.
- MAC CE MAC Control Element
- PDU MAC Protocol Data Unit
- the broadcast information includes, for example, a master information block (Master Information Block (MIB)), a system information block (System Information Block (SIB)), a minimum system information (Remaining Minimum System Information (RMSI)), and other system information ( Other System Information (OSI)) may be used.
- MIB Master Information Block
- SIB System Information Block
- RMSI Minimum System Information
- OSI Other System Information
- MAC CE and activation / deactivation commands may be read interchangeably.
- 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.
- the QCL type X-RS, the DL-RS associated with the QCL type X, the DL-RS having the QCL type X, the source of the DL-RS, the SSB, the CSI-RS, and the SRS may be read as each other. good.
- a panel an Uplink (UL) transmission entity, a TRP, a spatial relationship, a control resource set (COntrol REsource SET (CORESET)), a PDSCH, a code word, a base station, and an antenna port of a certain signal (for example, a reference signal for demodulation).
- a certain signal for example, a reference signal for demodulation.
- DMRS Demodulation Reference Signal
- antenna port group of a certain signal for example, DMRS port group
- group for multiplexing for example, Code Division Multiplexing (CDM) group, reference signal group, CORESET group
- CORESET pool for example, CORESET subset
- CW redundant version (redundancy version (RV)
- MIMO layer transmission layer, spatial layer
- the panel Identifier (ID) and the panel may be read as each other.
- the position of one of the two TCI states (ordinal, first TCI state or second TCI state) corresponding to one code point of the TRP ID, TRP related ID, CORESET pool index, field in DCI. ), TRP may be read as each other.
- one of the two TCI states associated with one code point in the TRP, transmit point, panel, DMRS port group, CORESET pool, and TCI field may be read interchangeably.
- single TRP, single TRP system, single TRP transmission, and single PDSCH may be read as each other.
- the multi-TRP, the multi-TRP system, the multi-TRP transmission, and the multi-PDSCH may be read as each other.
- single DCI, single PDCCH, single DCI-based multi-TRP, and activation of two TCI states on at least one TCI code point may be read interchangeably.
- a single TRP a channel using a single TRP, a channel using one TCI state / spatial relationship, a multi-TRP not enabled by RRC / DCI, and multiple TCI states / spatial relationships enabled by RRC / DCI.
- no CORESETPoolIndex value of 1 is set for any CORESET, and no code point in the TCI field is mapped to two TCI states may be read as mutually. ..
- a multi-TRP a channel using a multi-TRP, a channel using a plurality of TCI states / spatial relationships, a multi-TRP being enabled by RRC / DCI, and a plurality of TCI states / spatial relationships being enabled by RRC / DCI.
- At least one of a single DCI-based multi-TRP and a multi-DCI-based multi-TRP may be read interchangeably.
- the setting of a CORESETPoolIndex value of 1 for a multi-TRP and a CORESET based on a multi-DCI may be read as interchangeable with each other.
- the mapping of at least one code point in a single DCI-based multi-TRP, TCI field into two TCI states may be read interchangeably.
- pools, sets, groups, lists may be read interchangeably.
- BFR, BFR setting, BFD-RS, BFD-RS setting, RLM setting, RLM-RS, and RLM-RS setting may be read as each other.
- cell-specific BFR, cell-specific BFR, Rel. The 15/16 BFRs may be read interchangeably.
- each TRP (per TRP) BFR, TRP-specific BFR, Rel. 17 / Rel. BFRs after 17 may be read as each other.
- the UE may receive a MAC CE indicating two TCI states for one CORESET. If the RLM-RS information element (RadioLinkMonitoringRS) is not provided, the UE may use the RS in at least one of the two active TCI states for the RLM. If failureDetectionResources of failure detection resources (BFD-RS) are not provided, the UE may use RS in at least one of the two active TCI states for BFD. The UE may use the two active TCI states for each of the two repeated receptions of the PDCCH.
- RLM-RS information element RadioLinkMonitoringRS
- BFD-RS failureDetectionResources of failure detection resources
- RLM RadioLinkMonitoringRS
- N RLM RSs provided for the active TCI state for PDCCH reception may be selected. If more than one CORESET is associated with multiple search space sets with the same monitoring cycle, the UE may determine the CORESET order from the highest CORESET index.
- the selected RS may follow any of the following aspects 1-1-1 to 1-1-3.
- RS in both TCI states can be selected for RLM.
- the UE determines the order of the TCI states from the highest (or lowest) TCI state ID.
- the UE may select RS for RLM from the TCI states in that order.
- a MAC CE that activates two TCI states for each CORESET may be specified.
- This MAC CE may be a TCI instruction MAC CE for extended PDCCH (for example, Enhanced TCI State Indication for UE-specific PDCCH MAC CE).
- the TCI instruction MAC CE for the extended PDCCH is a serving cell ID field, a CORESET ID field, a TCI state ID1 (first TCI state) field, an R (reserved bit) field, and a TCI state ID2 (second TCI state). It may include at least one of the fields. Both the first TCI state indicated by the TCI state ID1 field and the second TCI state indicated by the TCI state ID2 field may be used for RLM.
- the configuration of the TCI indicating MAC CE for the extended PDCCH is the same as that of FIG. 3A. Only the first TCI state indicated by the TCI state ID1 field may be used for RLM.
- the configuration of the TCI indicating MAC CE for the extended PDCCH is the same as that of FIG. 3A.
- the first TCI state ID designated by the TCI state ID1 field and the second TCI state ID designated by the TCI state ID2 field only the TCI state with the lower (lowest) ID is the RLM. May be used for.
- the UE selects N RLM RSs based on a new rule that uses the CORESET index.
- RLM RadioLinkMonitoringRS
- the search space set monitoring cycle in the 16 rules need not be considered.
- the RS selected may follow any of aspects 1-1-1 to 1-1-3.
- the UE selects N RLM RSs based on a new rule using the TCI state ID.
- RLM RadioLinkMonitoringRS
- the UE is for the active TCI state for PDCCH reception, starting with the highest (or lowest) TCI state ID. You may select the N RLM RS provided in. This new rule may be based solely on the order of TCI state IDs.
- One of aspects 1-1-1 to 1-1-3 may be used for CORESET in which two TCI states are activated.
- N LR-RLM may be N RLM or higher.
- the UE can appropriately determine the RS for RLM even when the UE is not provided with the RLM-RS.
- ⁇ Aspect 2-1 The UE assumes that the number of BFD-RSs determined from the active TCI state of the PDCCH monitoring COREST is up to X.
- the UE is one of the following aspects 2-1-1 to 2-1-3. You may follow.
- RSs within both TCI states can be selected for BFD.
- the UE may determine the order of the TCI states from the highest (or lowest) TCI state ID.
- the UE may select RS for BFD from the TCI states in that order.
- the configuration of the TCI indicating MAC CE for the extended PDCCH is the same as that of FIG. 3A.
- Both the first TCI state indicated by the TCI state ID1 field and the second TCI state indicated by the TCI state ID2 field may be used for BFD.
- the configuration of the TCI indicating MAC CE for the extended PDCCH is the same as that of FIG. 3A. Only the first TCI state indicated by the TCI state ID1 field may be used for BFD.
- the configuration of the TCI indicating MAC CE for the extended PDCCH is the same as that of FIG. 3A.
- the first TCI state ID designated by the TCI state ID1 field and the second TCI state ID designated by the TCI state ID2 field only the TCI state with the lower (lowest) ID is BFD. May be used for.
- the value of X may be specified in the specification, set by higher layer signaling, or reported as UE capability information.
- L max different values of X may be specified in the specification, set by higher layer signaling, or reported as UE capability information.
- the value of X is Rel. It may be 2 similar to 16.
- ⁇ Aspect 2-2 The UE assumes that the number of BFD-RSs determined from the active TCI state of the PDCCH monitoring CORESET may be greater than X, and the UE selects X RSs based on the rules.
- the rule may be similar to the selection rule of RLM-RS in the first embodiment.
- the UE may follow any of the following aspects 2-2A to 2-2C.
- the UE is provided for the active TCI state for PDCCH reception within multiple CORESETs associated with multiple search space sets, in order from the shortest (minimum) monitoring cycle (of multiple search space sets). Select RS. If more than one CORESET is associated with multiple search space sets with the same monitoring cycle, the UE may determine the CORESET order from the highest CORESET index.
- the selected RS may follow any of the following aspects 2-2A-1 to 2-2A-3.
- RSs within both TCI states can be selected for BFD.
- the UE may determine the order of the TCI states from the highest (or lowest) TCI state ID.
- the UE may select RS for BFD from the TCI states in that order.
- FIG. 4A may be used.
- FIG. 4B may be used.
- FIG. 4C may be used.
- the UE selects the X RSs provided for the active TCI state for PDCCH reception within multiple CORESETs, in order from the highest CORESET index.
- the RS selected may follow any of aspects 2-2A-1 to 2-2A-3.
- the UE selects the X RSs provided for the active TCI state for PDCCH reception, in order from the highest (or lowest) TCI state ID.
- the RS selected may follow any of aspects 2-2A-1 to 2-2A-3.
- the value of X may be specified in the specification, set by higher layer signaling, or reported as UE capability information.
- L max different values of X may be specified in the specification, set by higher layer signaling, or reported as UE capability information.
- the value of X is Rel. It may be 2 similar to 16.
- the UE can appropriately determine the RS for BFD even when the UE is not provided with the failure detection resource.
- the UE may follow any of the following aspects 3-1 and 3-2.
- ⁇ Aspect 3-1 For each TRP, the UE assumes that the number of BFD-RSs determined from the active TCI state of the PDCCH monitoring COREST is up to X.
- the UE may follow at least one of the following aspects 3-1A to 3-1C.
- the RS in the first TCI state and the RS in the second TCI state activated by MAC CE may be used for the BFD for the first TRP and the second TRP, respectively.
- the configuration of the TCI indicating MAC CE for the extended PDCCH is the same as that of FIG. 3A.
- the first TCI state indicated by the TCI state ID1 field may be used for BFD for the first TRP.
- the second TCI state indicated by the TCI state ID2 field may be used for BFD for the second TRP.
- the RS in the first TCI state and the RS in the second TCI state activated by MAC CE may be used for the BFD for the first TRP and the second TRP, respectively.
- the RS in the TCI state with the lower TCI state ID and the RS in the TCI state with the higher TCI state ID are the first TRP and the second TRP for BFD. May be used for each.
- the configuration of the TCI indicating MAC CE for the extended PDCCH is the same as that of FIG. 3A.
- the TCI state with the lower TCI state ID (9) is used for BFD for the first TRP and is the higher TCI state ID.
- the TCI state having (10) may be used for BFD for the first TRP.
- the RS in the TCI state with the higher TCI state ID and the RS in the TCI state with the lower TCI state ID are the first TRP and the second TRP for BFD. May be used for each.
- An index corresponding to TRP can be set for CORESET.
- this index may be a group ID, a TRP ID, a CORESET pool index, or the like.
- the RS in that one TCI state is used for BFD to the TRP corresponding to the corresponding CORESET.
- the value of X may be specified in the specification, set by higher layer signaling, or reported as UE capability information.
- L max different values of X may be specified in the specification, set by higher layer signaling, or reported as UE capability information.
- the value of X is Rel. It may be 2 similar to 16.
- ⁇ Aspect 3-2 For each TRP, the UE assumes that the number of BFD-RSs determined from the active TCI state of the PDCCH monitoring CORESET may be greater than X, and the UE is X for each TRP based on the rules. Select RS.
- the rule may be at least one of the following aspects 3-2A to 3-2C.
- the UE is provided for the active TCI state for PDCCH reception within multiple CORESETs associated with multiple search space sets, in order from the shortest (minimum) monitoring cycle (of multiple search space sets). Select RS. If more than one CORESET is associated with multiple search space sets with the same monitoring cycle, the UE may determine the CORESET order from the highest CORESET index.
- the UE may follow any of the following embodiments 3-2AA-1 to 3-2AA-2.
- the RS in the first TCI state and the RS in the second TCI state activated by MAC CE may be used for the BFD for the first TRP and the second TRP, respectively.
- FIG. 5A may be used.
- the RS in the first TCI state and the RS in the second TCI state activated by MAC CE may be used for the BFD for the first TRP and the second TRP, respectively.
- the RS in the TCI state with the lower TCI state ID and the RS in the TCI state with the higher TCI state ID are the first TRP and the second TRP for BFD. May be used for each.
- FIG. 5B may be used.
- the RS in the TCI state with the higher TCI state ID and the RS in the TCI state with the lower TCI state ID are the first TRP and the second TRP for BFD. May be used for each.
- the UE may follow any of the following embodiments 3-2AB-1 to 3-2AB-3.
- An index corresponding to TRP can be set for CORESET.
- this index may be a group ID, a TRP ID, a CORESET pool index, or the like.
- the RS in that one TCI state is selected for BFD for the TRP corresponding to the corresponding CORESET.
- the UE selects, for each TRP, the X RSs provided for the active TCI state for PDCCH reception within multiple CORESETs, in order from the highest CORESET index.
- the RS selected may follow any of aspects 3-2AA-1 to 3-2AA-2. If one TCI state is activated for a CORESET selected under this rule, the RS selected may follow any of aspects 3-2AB-1 to 3-2AB-3.
- the UE selects, for each TRP, the X RSs provided for the active TCI state for PDCCH reception, in order from the highest (or lowest) TCI state ID.
- the RS selected may follow any of aspects 3-2AA-1 to 3-2AA-2.
- the RS selected may follow any of aspects 3-2AB-1 to 3-2AB-3.
- the value of X may be specified in the specification, set by higher layer signaling, or reported as UE capability information.
- L max different values of X may be specified in the specification, set by higher layer signaling, or reported as UE capability information.
- the value of X is Rel. It may be 2 similar to 16.
- the UE can appropriately determine the RS for BFD even when the BFD / BFR for each TRP is effective and the UE is not provided with the failure detection resource.
- RLM RadioLinkMonitoringRS
- the UE can appropriately determine the RS for RLM.
- ⁇ Fifth Embodiment> For RLM, if two TCI states are activated for CORESET, the UE does not expect to derive one or two BFD-RSs (not explicitly provided) by implied rules. That is, "if two TCI states are activated for CORESET (if PDCCH repetition is set), the UE assumes that failureDetectionResources are always set". It may be specified.
- the UE can appropriately determine the RS for BFD.
- Upper layer parameters (RRC information elements) / UE capabilities corresponding to at least one function (feature) in the first to fifth embodiments may be defined.
- UE capability may indicate that it supports this feature.
- the UE for which the upper layer parameter corresponding to the function is set may perform the function. It may be stipulated that "a UE for which an upper layer parameter corresponding to the function is not set does not perform the function".
- the UE that reports the UE capability indicating that it supports the function may perform the function. It may be stipulated that "a UE that has not reported a UE capability indicating that it supports the function shall not perform the function".
- the UE may perform the function. It may be specified that "the UE does not perform the function if it does not report the UE capability indicating that the UE supports the function, or if the upper layer parameter corresponding to the function is not set".
- the UE capability may indicate whether or not to support one CORESET in which two TCI states are activated (two TCI states are activated for one CORESET).
- the UE capability is the RS for RLM or BFD from the TCI state for that CORESET when one CORESET activates two TCI states (when two TCI states are activated for one CORESET). It may indicate whether or not to support the decision.
- UE capability may indicate the number of RSs used for RLM or BFD / BFR.
- the UE capability may indicate whether or not to support BFD / BFR for each TRP.
- the UE capability indicates whether to support BFD / BFR per TRP when one CORESET activates two TCI states (two TCI states activated for one CORESET). May be.
- the UE capability may indicate the number of RSs used for BFD / BFR for each TRP.
- the UE can realize the above functions while maintaining compatibility with existing specifications.
- wireless communication system Wireless communication system
- communication is performed using any one of the wireless communication methods according to each of the above-described embodiments of the present disclosure or a combination thereof.
- FIG. 6 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by Third Generation Partnership Project (3GPP). ..
- the wireless communication system 1 may support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs).
- MR-DC is a dual connectivity (E-UTRA-NR Dual Connectivity (EN-DC)) between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR, and a dual connectivity (NR-E) between NR and LTE.
- E-UTRA-NR Dual Connectivity Evolved Universal Terrestrial Radio Access (E-UTRA)
- NR-E dual connectivity
- NE-DC -UTRA Dual Connectivity
- the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)).
- the base station (gNB) of NR is MN
- the base station (eNB) of LTE (E-UTRA) is SN.
- the wireless communication system 1 has dual connectivity between a plurality of base stations in the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both MN and SN are NR base stations (gNB). )) May be supported.
- a plurality of base stations in the same RAT for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both MN and SN are NR base stations (gNB). )
- NR-NR Dual Connectivity NR-DC
- gNB NR base stations
- the wireless communication system 1 includes a base station 11 that forms a macrocell C1 having a relatively wide coverage, and a base station 12 (12a-12c) that is arranged in the macrocell C1 and forms a small cell C2 that is narrower than the macrocell C1. You may prepare.
- the user terminal 20 may be located in at least one cell. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure.
- the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.
- the user terminal 20 may be connected to at least one of a plurality of base stations 10.
- the user terminal 20 may use at least one of carrier aggregation (Carrier Aggregation (CA)) and dual connectivity (DC) using a plurality of component carriers (Component Carrier (CC)).
- CA Carrier Aggregation
- DC dual connectivity
- CC Component Carrier
- Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)).
- the macrocell C1 may be included in FR1 and the small cell C2 may be included in FR2.
- FR1 may be in a frequency band of 6 GHz or less (sub 6 GHz (sub-6 GHz)), and FR 2 may be in a frequency band higher than 24 GHz (above-24 GHz).
- the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.
- the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- the plurality of base stations 10 may be connected by wire (for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
- wire for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the higher-level station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to a relay station (relay) is IAB. It may be called a node.
- IAB Integrated Access Backhaul
- relay station relay station
- the base station 10 may be connected to the core network 30 via another base station 10 or directly.
- the core network 30 may include at least one such as Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.
- a wireless access method based on Orthogonal Frequency Division Multiplexing may be used.
- OFDM Orthogonal Frequency Division Multiplexing
- DL Downlink
- UL Uplink
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple. Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the wireless access method may be called a waveform.
- another wireless access system for example, another single carrier transmission system, another multi-carrier transmission system
- the UL and DL wireless access systems may be used as the UL and DL wireless access systems.
- a downlink shared channel Physical Downlink Shared Channel (PDSCH)
- a broadcast channel Physical Broadcast Channel (PBCH)
- a downlink control channel Physical Downlink Control
- PDSCH Physical Downlink Control
- the uplink shared channel Physical Uplink Shared Channel (PUSCH)
- the uplink control channel Physical Uplink Control Channel (PUCCH)
- the random access channel shared by each user terminal 20 are used.
- Physical Random Access Channel (PRACH) Physical Random Access Channel or the like may be used.
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by PDSCH.
- User data, upper layer control information, and the like may be transmitted by the PUSCH.
- the Master Information Block (MIB) may be transmitted by the PBCH.
- Lower layer control information may be transmitted by PDCCH.
- the lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of PDSCH and PUSCH.
- DCI Downlink Control Information
- the DCI that schedules PDSCH may be called DL assignment, DL DCI, or the like, and the DCI that schedules PUSCH may be called UL grant, UL DCI, or the like.
- the PDSCH may be read as DL data, and the PUSCH may be read as UL data.
- a control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may be used for PDCCH detection.
- CORESET corresponds to a resource for searching DCI.
- the search space corresponds to the search area and search method of PDCCH candidates (PDCCH candidates).
- One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a search space based on the search space settings.
- One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set.
- the "search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. of the present disclosure may be read as each other.
- channel state information (Channel State Information (CSI)
- delivery confirmation information for example, it may be called Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.
- scheduling request (Scheduling Request).
- Uplink Control Information including at least one of SR)
- the PRACH may transmit a random access preamble to establish a connection with the cell.
- downlinks, uplinks, etc. may be expressed without “links”. Further, it may be expressed without adding "Physical" to the beginning of various channels.
- a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like may be transmitted.
- the DL-RS includes a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a reference signal for demodulation (DeModulation).
- CRS Cell-specific Reference Signal
- CSI-RS Channel State Information Reference Signal
- DMRS positioning 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 (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as SS / PBCH block, SS Block (SSB) and the like.
- SS, SSB and the like may also be called a reference signal.
- a measurement reference signal Sounding Reference Signal (SRS)
- a demodulation reference signal DMRS
- UL-RS Uplink Reference Signal
- UE-specific Reference Signal UE-specific Reference Signal
- FIG. 7 is a diagram showing an example of the configuration of the base station according to the embodiment.
- the base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140.
- the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may each be provided with one or more.
- the functional block of the characteristic portion in the present embodiment is mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each part described below may be omitted.
- the control unit 110 controls the entire base station 10.
- the control unit 110 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (for example, resource allocation, mapping) and the like.
- the control unit 110 may control transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140.
- the control unit 110 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 120.
- the control unit 110 may perform call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of radio resources, and the like.
- the transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123.
- the baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212.
- the transmission / reception unit 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like, which are described based on the common recognition in the technical field according to the present disclosure. be able to.
- the transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122.
- the receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.
- the transmitting / receiving antenna 130 can be composed of an antenna described based on the common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 120 processes, for example, Packet Data Convergence Protocol (PDCP) layer processing and Radio Link Control (RLC) layer processing (for example, RLC) for data, control information, etc. acquired from control unit 110.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control HARQ retransmission control
- the transmission / reception unit 120 performs channel coding (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (Discrete Fourier Transform (DFT)) for the bit string to be transmitted. Processing (if necessary), inverse Fast Fourier Transform (IFFT) processing, precoding, transmission processing such as digital-analog transformation may be performed, and the baseband signal may be output.
- channel coding may include error correction coding
- modulation modulation
- mapping mapping, filtering
- DFT discrete Fourier Transform
- IFFT inverse Fast Fourier Transform
- precoding coding
- transmission processing such as digital-analog transformation
- the transmission / reception unit 120 may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 130. ..
- the transmission / reception unit 120 may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 130.
- the transmission / reception unit 120 (reception processing unit 1212) performs analog-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) for the acquired baseband signal. )) Processing (if necessary), filtering, decoding, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing are applied. User data and the like may be acquired.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- the transmission / reception unit 120 may perform measurement on the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, or the like based on the received signal.
- the measuring unit 123 has received power (for example, Reference Signal Received Power (RSRP)) and reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)).
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- Signal strength for example, Received Signal Strength Indicator (RSSI)
- propagation path information for example, CSI
- the measurement result may be output to the control unit 110.
- the transmission line interface 140 transmits / receives signals (backhaul signaling) to / from a device included in the core network 30, another base station 10, etc., and user data (user plane data) for the user terminal 20 and a control plane. Data or the like may be acquired or transmitted.
- the transmission unit and the reception unit of the base station 10 in the present disclosure may be composed of at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140.
- the transmission / reception unit 120 may transmit a medium access control-control element (MAC CE) indicating two active transmission configuration indicators (TCI) states for one control resource set.
- MAC CE medium access control-control element
- TCI transmission configuration indicators
- the control unit 110 may use the reference signal in at least one of the two active TCI states for the RLM.
- the transmission / reception unit 120 may transmit a medium access control-control element (MAC CE) indicating two active transmission configuration indicators (TCI) states for one control resource set.
- MAC CE medium access control-control element
- TCI transmission configuration indicators
- BFD beam failure detection
- FIG. 8 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
- the user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230.
- the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided with one or more.
- the functional block of the feature portion in the present embodiment is mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each part described below may be omitted.
- the control unit 210 controls the entire user terminal 20.
- the control unit 210 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.
- the control unit 210 may control signal generation, mapping, and the like.
- the control unit 210 may control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230.
- the control unit 210 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 220.
- the transmission / reception unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223.
- the baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212.
- the transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like, which are described based on the common recognition in the technical field according to the present disclosure.
- the transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222.
- the receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.
- the transmitting / receiving antenna 230 can be composed of an antenna described based on the common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 220 processes, for example, PDCP layer processing, RLC layer processing (for example, RLC retransmission control), and MAC layer processing (for example, for data, control information, etc. acquired from the control unit 210). , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- the transmission / reception unit 220 (transmission processing unit 2211) performs channel coding (may include error correction coding), modulation, mapping, filtering processing, DFT processing (if necessary), and IFFT processing for the bit string to be transmitted. , Precoding, digital-to-analog conversion, and other transmission processing may be performed to output a baseband signal.
- Whether or not to apply the DFT process may be based on the transform precoding setting.
- the transmission / reception unit 220 transmits the channel using the DFT-s-OFDM waveform.
- the DFT process may be performed as the transmission process, and if not, the DFT process may not be performed as the transmission process.
- the transmission / reception unit 220 may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 230. ..
- the transmission / reception unit 220 may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 230.
- the transmission / reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, and decoding (error correction) for the acquired baseband signal. Decoding may be included), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmission / reception unit 220 may perform measurement on the received signal.
- the measuring unit 223 may perform RRM measurement, CSI measurement, or the like based on the received signal.
- the measuring unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like.
- the measurement result may be output to the control unit 210.
- the transmission unit and the reception unit of the user terminal 20 in the present disclosure may be composed of at least one of the transmission / reception unit 220, the transmission / reception antenna 230, and the transmission path interface 240.
- the transmission / reception unit 220 may receive a medium access control-control element (MAC CE) indicating two active transmission configuration indicators (TCI) states for one control resource set.
- MAC CE medium access control-control element
- TCI transmission configuration indicators
- the control unit 210 may use the reference signal in at least one of the two active TCI states for the RLM (first). Embodiment).
- the control unit 210 sets the plurality of control resource sets based on the monitoring cycle of each of the plurality of search space sets and the respective indexes of the plurality of control resource sets associated with the plurality of search space sets.
- the one control resource set may be determined from (1st embodiment, embodiment 1-1).
- the control unit 210 may determine the one control resource set from the plurality of control resource sets based on the respective indexes of the plurality of control resource sets (first embodiment, embodiment 1-2). ..
- the control unit 210 may determine at least one TCI state based on the TCI state ID (first embodiment, embodiment 1-3).
- the transmission / reception unit 220 may receive a medium access control-control element (MAC CE) indicating two active transmission configuration indicators (TCI) states for one control resource set.
- MAC CE medium access control-control element
- TCI transmission configuration indicators
- the control unit 210 may use the reference signal in at least one of the two TCI states for beam failure detection (BFD) (second, second). 3 Embodiment).
- the number of reference signals in a plurality of active TCI states for a plurality of control resource sets including the one control resource set may be a certain number or less (second and third embodiments).
- the control unit 210 uses the certain number of reference signals for BFD. It may be good (second and third embodiments).
- the control unit 210 may use the two active TCI states for BFD for two transmission / reception points, respectively (third embodiment).
- each functional block is realized using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , Wired, wireless, etc.) and may be realized using these plurality of devices.
- the functional block may be realized by combining the software with the one device or the plurality of devices.
- the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (configuration unit) for functioning transmission may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like.
- the realization method is not particularly limited.
- the base station, user terminal, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure.
- FIG. 9 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- the base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. ..
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.
- processor 1001 may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by two or more processors.
- the processor 1001 may be mounted by one or more chips.
- the processor 1001 For each function in the base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation and communicates via the communication device 1004. It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.
- predetermined software program
- the processor 1001 operates, for example, an operating system to control the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.
- CPU central processing unit
- control unit 110 210
- transmission / reception unit 120 220
- the like may be realized by the processor 1001.
- the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
- a program program code
- the control unit 110 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks.
- the memory 1002 is a computer-readable recording medium, for example, at least a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), or any other suitable storage medium. It may be composed of one.
- the memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, and is, for example, a flexible disk, a floppy disk (registered trademark) disk, an optical magnetic disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, etc.). At least one of Blu-ray® discs), removable discs, optical disc drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers and other suitable storage media. May be configured by.
- the storage 1003 may be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 has, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)). May be configured to include.
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- the transmission / reception unit 120 (220), transmission / reception antenna 130 (230), and the like may be realized by the communication device 1004.
- the transmission / reception unit 120 (220) may be physically or logically separated by the transmission unit 120a (220a) and the reception unit 120b (220b).
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information.
- the bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like. It may be configured to include hardware, and a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.
- DSP Digital Signal Processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- the terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings.
- channels, symbols and signals may be read interchangeably.
- the signal may be a message.
- the reference signal may be abbreviated as RS, and may be referred to as a pilot, a pilot signal, or the like depending on the applied standard.
- the component carrier CC may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.
- the wireless frame may be configured by one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe.
- the subframe may be composed of one or more slots in the time domain.
- the subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.
- the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel.
- Numerology includes, for example, subcarrier spacing (SubCarrier Spacing (SCS)), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval (TTI)), number of symbols per TTI, and wireless frame configuration.
- SCS subcarrier Spacing
- TTI Transmission Time Interval
- a specific filtering process performed by the transmitter / receiver in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.
- the slot may be composed of one or more symbols in the time area (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.). Further, the slot may be a time unit based on numerology.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the slot may include a plurality of mini slots.
- Each minislot may be composed of one or more symbols in the time domain. Further, the mini-slot may be referred to as a sub-slot.
- a minislot may consist of a smaller number of symbols than the slot.
- the PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (PUSCH) mapping type A.
- the PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (PUSCH) mapping type B.
- Wireless frames, subframes, slots, mini slots and symbols all represent time units when transmitting signals.
- the radio frame, subframe, slot, minislot and symbol may use different names corresponding to each.
- the time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read as each other.
- one subframe may be referred to as TTI
- a plurality of consecutive subframes may be referred to as TTI
- one slot or one minislot may be referred to as TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. May be.
- the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
- the base station schedules each user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units.
- the definition of TTI is not limited to this.
- the TTI may be a transmission time unit such as a channel-coded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
- the time interval for example, the number of symbols
- the transport block, code block, code word, etc. may be shorter than the TTI.
- one or more TTIs may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
- a TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, or the like.
- the long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms
- the short TTI (for example, shortened TTI, etc.) may be read as a TTI less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
- the number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12.
- the number of subcarriers contained in the RB may be determined based on numerology.
- the RB may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe or 1 TTI.
- Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
- one or more RBs are a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, and an RB. It may be called a pair or the like.
- PRB Physical RB
- SCG sub-carrier Group
- REG resource element group
- PRB pair an RB. It may be called a pair or the like.
- the resource block may be composed of one or a plurality of resource elements (Resource Element (RE)).
- RE Resource Element
- 1RE may be a radio resource area of 1 subcarrier and 1 symbol.
- Bandwidth Part (which may also be called partial bandwidth) represents a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. May be good.
- the common RB may be specified by the index of the RB with respect to the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- the BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP UL BWP
- BWP for DL DL BWP
- One or more BWPs may be set in one carrier for the UE.
- At least one of the configured BWPs may be active and the UE may not expect to send or receive a given signal / channel outside the active BWP.
- “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
- the above-mentioned structures such as wireless frames, subframes, slots, mini slots, and symbols are merely examples.
- the number of subframes contained in a radio frame the number of slots per subframe or radioframe, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB.
- the number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be changed in various ways.
- the information, parameters, etc. described in the present disclosure may be expressed using an absolute value, a relative value from a predetermined value, or another corresponding information. It may be represented.
- the radio resource may be indicated by a given index.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
- information, signals, etc. can be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layers.
- Information, signals, etc. may be input / output via a plurality of network nodes.
- Input / output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information, signals, etc. can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.
- the notification of information is not limited to the embodiment / embodiment described in the present disclosure, and may be performed by using another method.
- the notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (DCI)), uplink control information (Uplink Control Information (UCI))), and higher layer signaling (for example, Radio Resource Control). (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals or combinations thereof. May be carried out by.
- DCI downlink control information
- UCI Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like.
- the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.
- MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).
- CE MAC Control Element
- the notification of predetermined information is not limited to the explicit notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).
- the determination may be made by a value represented by 1 bit (0 or 1), or by a boolean value represented by true or false. , May be done by numerical comparison (eg, comparison with a given value).
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) on the website.
- wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.
- wireless technology infrared, microwave, etc.
- the terms “system” and “network” used in this disclosure may be used interchangeably.
- the “network” may mean a device (eg, a base station) included in the network.
- precoding "precoding weight”
- QCL Quality of Co-Co-Location
- TCI state Transmission Configuration Indication state
- space "Spatial relation”, “spatial domain filter”, “transmission power”, “phase rotation”, "antenna port”, “antenna port group”, “layer”, “number of layers”
- Terms such as “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, "antenna”, “antenna element", “panel” are compatible.
- base station BS
- wireless base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission point (Transmission Point (TP))
- Reception point Reception Point
- TRP Transmission / Reception Point
- Panel , "Cell”, “sector”, “cell group”, “carrier”, “component carrier” and the like
- Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
- the base station can accommodate one or more (eg, 3) cells.
- a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio). Communication services can also be provided by Head (RRH))).
- RRH Remote Radio Head
- the term "cell” or “sector” refers to part or all of the coverage area of at least one of a base station and a base station subsystem that provides communication services in this coverage.
- MS mobile station
- UE user equipment
- terminal terminal
- Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , Handset, user agent, mobile client, client or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on the mobile body, a mobile body itself, or the like.
- the moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be.
- at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
- at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read by the user terminal.
- communication between a base station and a user terminal has been replaced with communication between a plurality of user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- D2D Device-to-Device
- V2X Vehicle-to-Everything
- Each aspect / embodiment of the present disclosure may be applied to the configuration.
- the user terminal 20 may have the function of the base station 10 described above.
- words such as "uplink” and "downlink” may be read as words corresponding to communication between terminals (for example, "sidelink”).
- the uplink channel, the downlink channel, and the like may be read as the side link channel.
- the user terminal in the present disclosure may be read as a base station.
- the base station 10 may have the functions of the user terminal 20 described above.
- the operation performed by the base station may be performed by its upper node (upper node) in some cases.
- various operations performed for communication with a terminal are a base station, one or more network nodes other than the base station (for example,).
- Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. can be considered, but it is not limited to these), or it is clear that it can be performed by a combination thereof.
- Each aspect / embodiment described in the present disclosure may be used alone, in combination, or may be switched and used according to the execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG xG (xG (x is, for example, an integer or a fraction)
- Future Radio Access FAA
- RAT New -Radio Access Technology
- NR New Radio
- NX New radio access
- FX Future generation radio access
- GSM registered trademark
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- UMB Ultra Mobile Broadband
- LTE 802.11 Wi-Fi®
- LTE 802.16 WiMAX®
- LTE 802.20 Ultra-WideBand (UWB), Bluetooth®, and other suitable radios.
- UMB Ultra Mobile Broadband
- references to elements using designations such as “first” and “second” as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.
- determining used in this disclosure may include a wide variety of actions.
- judgment (decision) means judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry) ( For example, searching in a table, database or another data structure), ascertaining, etc. may be considered to be "judgment”.
- judgment (decision) includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access (for example). It may be regarded as “determining” such as accessing) (for example, accessing data in memory).
- judgment (decision) is regarded as “judgment (decision)” of solving, selecting, selecting, establishing, comparing, and the like. May be good. That is, “judgment (decision)” may be regarded as “judgment (decision)” of some action.
- the "maximum transmission power" described in the present disclosure may mean the maximum value of the transmission power, may mean the nominal UE maximum transmit power, or may mean the rated maximum transmission power (the). It may mean rated UE maximum transmit power).
- connection are any direct or indirect connections or connections between two or more elements. Means, and can include the presence of one or more intermediate elements between two elements that are “connected” or “bonded” to each other.
- the connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection” may be read as "access”.
- the radio frequency region when two elements are connected, one or more wires, cables, printed electrical connections, etc. are used, and as some non-limiting and non-comprehensive examples, the radio frequency region, microwaves. It can be considered to be “connected” or “coupled” to each other using electromagnetic energy having wavelengths in the region, light (both visible and invisible) regions, and the like.
- the term "A and B are different” may mean “A and B are different from each other”.
- the term may mean that "A and B are different from C”.
- Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
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Abstract
Description
NRでは、送信設定指示状態(Transmission Configuration Indication state(TCI状態))に基づいて、信号及びチャネルの少なくとも一方(信号/チャネルと表現する)のUEにおける受信処理(例えば、受信、デマッピング、復調、復号の少なくとも1つ)、送信処理(例えば、送信、マッピング、プリコーディング、変調、符号化の少なくとも1つ)を制御することが検討されている。
・QCLタイプA(QCL-A):ドップラーシフト、ドップラースプレッド、平均遅延及び遅延スプレッド、
・QCLタイプB(QCL-B):ドップラーシフト及びドップラースプレッド、
・QCLタイプC(QCL-C):ドップラーシフト及び平均遅延、
・QCLタイプD(QCL-D):空間受信パラメータ。
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。
PDCCHの信頼性の向上が検討されている。2つのTCI状態を用いるPDCCH送信を可能するために、2つのアクティブTCI状態を有する1つのCORESETのサポートが検討されている。具体的には、single frequency network(SFN)方式と、与えられたサーチスペースセット内の1つのPDCCH候補が、CORESETの2つのTCI状態の両方に関連付けられることと、の組み合わせが検討されている。
UEは、1つのCORESETに対する2つのTCI状態を示すMAC CEを受信してもよい。RLM-RSの情報要素(RadioLinkMonitoringRS)が提供されない場合、UEは2つのアクティブTCI状態のうちの少なくとも1つのTCI状態内のRSをRLMに用いてもよい。障害検出リソース(BFD-RS)の情報要素(failureDetectionResources)が提供されない場合、UEは2つのアクティブTCI状態のうちの少なくとも1つのTCI状態内のRSをBFDに用いてもよい。UEは、2つのアクティブTCI状態を、PDCCHの2つの繰り返しの受信にそれぞれ用いてもよい。
RLMに対し、もしUEがRLM-RS(RadioLinkMonitoringRS)を提供されず、Lmax=4である場合、UEは、以下の態様1-1から1-5の少なくとも1つのルールに基づいて、NRLM個のRSを選択する。
UEは、サーチスペースセットのモニタリング周期と、CORESETインデックスと、を用いるRel.16のルールに基づいて、NRLM個のRSを選択する。
両方のTCI状態内のRSが、RLM用に選択されることができる。1つのCORESETのTCI状態に対し、UEは、最高(又は最低)のTCI状態IDからのTCI状態の順を決定する。UEは、その順のTCI状態からRLM用RSを選択してもよい。
MAC CEによってアクティベートされた第1(又は第2)のTCI状態内のRSのみが、RLM用に選択されることができる。
より低い(又はより高い)TCI状態IDを有するTCI状態内のRSのみが、RLM用に選択されることができる。
UEは、CORESETインデックスを用いる新規ルールに基づいて、NRLM個のRSを選択する。
UEは、TCI状態IDを用いる新規ルールに基づいて、NRLM個のRSを選択する。
態様1-1から1-3のいずれかのルールが、Lmax=8及び64の少なくとも1つに対しても適用される。
Lmax=4,8及び64の少なくとも1つに対応するNRLMが、Rel.16におけるNRLMより大きくてもよい。例えば、Lmax=4に対し、NRLM=2であってもよい。Lmax=4,8及び64の少なくとも1つに対応するNLR-RLMが、Rel.16におけるNLR-RLMより大きくてもよい。NLR-RLMは、NRLM以上であってもよい。例えば、Lmax=4に対し、NRLM=4、NLR-RLMが4以上であってもよい。
BFD/BFRに対し、もしUEが障害検出リソース(failureDetectionResources)を提供されない場合、UEは、以下の態様2-1及び2-2のいずれかに従う。
UEは、PDCCHモニタリング用CORESETのアクティブTCI状態から決定されるBFD-RSの数がXまでであると想定する。
両方のTCI状態内のRSが、BFD用に選択されることができる。1つのCORESETのTCI状態に対し、UEは、最高(又は最低)のTCI状態IDからのTCI状態の順を決定してもよい。UEは、その順のTCI状態からBFD用RSを選択してもよい。
MAC CEによってアクティベートされた第1(又は第2)のTCI状態内のRSのみが、BFD用に選択されることができる。
より低い(又はより高い)TCI状態IDを有するTCI状態内のRSのみが、BFD用に選択されることができる。
UEは、PDCCHモニタリング用CORESETのアクティブTCI状態から決定されるBFD-RSの数がXより大きくてもよいと想定し、UEは、ルールに基づいてX個のRSを選択する。そのルールは、第1の実施形態におけるRLM-RSの選択ルールをと同様であってもよい。UEは、以下の態様2-2Aから2-2Cのいずれかに従ってもよい。
UEは、(複数のサーチスペースセットの)最短(最小)のモニタリング周期からの順に、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X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の順を決定してもよい。
両方のTCI状態内のRSが、BFD用に選択されることができる。1つのCORESETのTCI状態に対し、UEは、最高(又は最低)のTCI状態IDからのTCI状態の順を決定してもよい。UEは、その順のTCI状態からBFD用RSを選択してもよい。
MAC CEによってアクティベートされた第1(又は第2)のTCI状態内のRSのみが、BFD用に選択されることができる。
より低い(又はより高い)TCI状態IDを有するTCI状態内のRSのみが、BFD用に選択されることができる。
UEは、最高のCORESETインデックスからの順に、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X個のRSを選択する。
UEは、最高(又は最低)のTCI状態IDからの順に、PDCCH受信用のアクティブTCI状態用に提供されたX個のRSを選択する。
TRP毎のBFD/BFRが有効であり、もしUEが障害検出リソース(failureDetectionResources)を提供されない場合、2つのTRPに対してBFD-RSの2つのセットがそれぞれ決定される。UEは、以下の態様3-1及び3-2のいずれかに従ってもよい。
各TRPに対し、UEは、PDCCHモニタリング用CORESETのアクティブTCI状態から決定されるBFD-RSの数がXまでであると想定する。
BFDに対し、UEが障害検出リソースを提供されず、1つのCORESETに対して2つのTCI状態がアクティベートされた場合、UEは、以下の態様3-1A-1及び3-1A-2のいずれかに従ってもよい。
MAC CEによってアクティベートされた第1のTCI状態内のRSと第2のTCI状態内のRSとが、BFD用に、第1のTRPと第2のTRPとに対してそれぞれ用いられてもよい。
2つのTCI状態のうち、より低いTCI状態IDを有するTCI状態内のRSと、より高いTCI状態IDを有するTCI状態内のRSとが、BFD用に、第1のTRPと第2のTRPとに対してそれぞれ用いられてもよい。
BFDに対し、UEが障害検出リソースを提供されず、1つのCORESETに対して1つのTCI状態がアクティベートされた場合、UEは、以下の態様3-1B-1から3-1B-3のいずれかに従ってもよい。例えば、この場合は、幾つかのCORESETがマルチTRP繰り返しに用いられ、他の幾つかのCORESETがシングルTRPに用いられる場合であってもよい。
その1つのTCI状態内のRSが第1(又は第2)のTRPに対するBFDに用いられる。この動作はデフォルトであってもよい。
CORESETに対し、TRPに対応するインデックスが設定されることができる。例えば、このインデックスは、グループID、TRP ID、CORESETプールインデックスなどであってもよい。その1つのTCI状態内のRSは、対応するCORESETに対応するTRPに対するBFDに用いられる。
その1つのTCI状態内のRSは、BFDに用いられない。
BFDに対し、UEが障害検出リソースを提供されない場合、UEは、各TRPに対し、決定されるRS(PDCCHモニタリング用CORESETのアクティブTCI状態から決定されるBFD-RS)の数がXまでであると想定する。
各TRPに対し、UEは、PDCCHモニタリング用CORESETのアクティブTCI状態から決定されるBFD-RSの数がXより大きくてもよいと想定し、UEは、ルールに基づいて、各TRPに対してX個のRSを選択する。
UEは、(複数のサーチスペースセットの)最短(最小)のモニタリング周期からの順に、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X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の順を決定してもよい。
MAC CEによってアクティベートされた第1のTCI状態内のRSと第2のTCI状態内のRSとが、BFD用に、第1のTRPと第2のTRPとに対してそれぞれ用いられてもよい。
2つのTCI状態のうち、より低いTCI状態IDを有するTCI状態内のRSと、より高いTCI状態IDを有するTCI状態内のRSとが、BFD用に、第1のTRPと第2のTRPとに対してそれぞれ用いられてもよい。
その1つのTCI状態内のRSが第1(又は第2)のTRPに対するBFD用に選択される。この動作はデフォルトであってもよい。
CORESETに対し、TRPに対応するインデックスが設定されることができる。例えば、このインデックスは、グループID、TRP ID、CORESETプールインデックスなどであってもよい。その1つのTCI状態内のRSは、対応するCORESETに対応するTRPに対するBFD用に選択される。
その1つのTCI状態内のRSは、選択されない。
UEは、各TRPに対し、最高のCORESETインデックスからの順に、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X個のRSを選択する。
UEは、各TRPに対し、最高(又は最低)のTCI状態IDからの順に、PDCCH受信用のアクティブTCI状態用に提供されたX個のRSを選択する。
RLMに対し、もしCORESETに対して2つのTCI状態がアクティベートされた場合、UEは、暗示的ルールによって(明示的に提供されない)1つ又は2つのRLM-RSを導出することを想定しない。即ち、「もしCORESETに対して2つのTCI状態がアクティベートされた場合(もしPDCCH繰り返し(repetition)が設定された場合)、RLM-RS(RadioLinkMonitoringRS)が常に設定されるとUEが想定すること」が規定されてもよい。
RLMに対し、もしCORESETに対して2つのTCI状態がアクティベートされた場合、UEは、暗示的ルールによって(明示的に提供されない)1つ又は2つのBFD-RSを導出することを想定しない。即ち、「もしCORESETに対して2つのTCI状態がアクティベートされた場合(もしPDCCH繰り返し(repetition)が設定された場合)、障害検出リソース(failureDetectionResources)が常に設定されるとUEが想定すること」が規定されてもよい。
第1から第5の実施形態における少なくとも1つの機能(特徴、feature)に対応する上位レイヤパラメータ(RRC情報要素)/UE能力(capability)が規定されてもよい。UE能力は、この機能をサポートすることを示してもよい。
以下、本開示の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本開示の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図7は、一実施形態に係る基地局の構成の一例を示す図である。基地局10は、制御部110、送受信部120、送受信アンテナ130及び伝送路インターフェース(transmission line interface)140を備えている。なお、制御部110、送受信部120及び送受信アンテナ130及び伝送路インターフェース140は、それぞれ1つ以上が備えられてもよい。
図8は、一実施形態に係るユーザ端末の構成の一例を示す図である。ユーザ端末20は、制御部210、送受信部220及び送受信アンテナ230を備えている。なお、制御部210、送受信部220及び送受信アンテナ230は、それぞれ1つ以上が備えられてもよい。
なお、上記実施形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及びソフトウェアの少なくとも一方の任意の組み合わせによって実現される。また、各機能ブロックの実現方法は特に限定されない。すなわち、各機能ブロックは、物理的又は論理的に結合した1つの装置を用いて実現されてもよいし、物理的又は論理的に分離した2つ以上の装置を直接的又は間接的に(例えば、有線、無線などを用いて)接続し、これら複数の装置を用いて実現されてもよい。機能ブロックは、上記1つの装置又は上記複数の装置にソフトウェアを組み合わせて実現されてもよい。
なお、本開示において説明した用語及び本開示の理解に必要な用語については、同一の又は類似する意味を有する用語と置き換えてもよい。例えば、チャネル、シンボル及び信号(シグナル又はシグナリング)は、互いに読み替えられてもよい。また、信号はメッセージであってもよい。参照信号(reference signal)は、RSと略称することもでき、適用される標準によってパイロット(Pilot)、パイロット信号などと呼ばれてもよい。また、コンポーネントキャリア(Component Carrier(CC))は、セル、周波数キャリア、キャリア周波数などと呼ばれてもよい。
Claims (6)
- 1つのコントロールリソースセットに対する2つのアクティブtransmission configuration indicator(TCI)状態を示すmedium access control-control element(MAC CE)を受信する受信部と、
radio link monitoring(RLM)参照信号の情報要素が提供されない場合、前記2つのアクティブTCI状態のうちの少なくとも1つのTCI状態内の参照信号をRLMに用いる制御部と、を有する端末。 - 前記制御部は、複数のサーチスペースセットのそれぞれのモニタリング周期と、前記複数のサーチスペースセットにそれぞれ関連付けられた複数のコントロールリソースセットのそれぞれのインデックスと、に基づいて、前記複数のコントロールリソースセットから前記1つのコントロールリソースセットを決定する、請求項1に記載の端末。
- 前記制御部は、複数のコントロールリソースセットのそれぞれのインデックスに基づいて、前記複数のコントロールリソースセットから前記1つのコントロールリソースセットを決定する、請求項1に記載の端末。
- 前記制御部は、TCI状態IDに基づいて、前記少なくとも1つのTCI状態を決定する、請求項1に記載の端末。
- 1つのコントロールリソースセットに対する2つのアクティブtransmission configuration indicator(TCI)状態を示すmedium access control-control element(MAC CE)を受信するステップと、
radio link monitoring(RLM)参照信号の情報要素が提供されない場合、前記2つのアクティブTCI状態のうちの少なくとも1つのTCI状態内の参照信号をRLMに用いるステップと、を有する、端末の無線通信方法。 - 1つのコントロールリソースセットに対する2つのアクティブtransmission configuration indicator(TCI)状態を示すmedium access control-control element(MAC CE)を送信する送信部と、
radio link monitoring(RLM)参照信号の情報要素を提供しない場合、前記2つのアクティブTCI状態のうちの少なくとも1つのTCI状態内の参照信号をRLMに用いる制御部と、を有する基地局。
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