WO2023007659A1 - 端末、無線通信方法及び基地局 - Google Patents
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Definitions
- the present disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- 3GPP Rel. 10-14 LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).
- LTE successor systems for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later
- 5G 5th generation mobile communication system
- 5G+ 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- Radio Link Monitoring is used in radio communication systems (eg, NR).
- a reference signal (RS) used for RLM may be referred to as RLM-RS.
- the UE performs beam failure detection (BFD) in order to suppress the occurrence of radio link failure (Radio Link Failure (RLF)) due to deterioration of radio link quality.
- BFD-RS A reference signal used in BFD
- a new beam indication New Beam Identification (NBI)
- BFR Beam Failure Recovery
- NBI-RS New Beam Identification
- one object of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately determine an RS to be used for at least one of RLM, BFD, and BFR.
- a terminal includes a receiving unit that receives a reference signal associated with a second physical cell ID (PCI) that is different from the first physical cell ID (PCI) that corresponds to a serving cell, and the reference and a controller for controlling at least one of radio link monitoring (RLM), beam failure detection (BFD), and beam failure recovery (BFR) using signals.
- PCI physical cell ID
- RLM radio link monitoring
- BFD beam failure detection
- BFR beam failure recovery
- an RS to be used for at least one of RLM, BFD, and BFR can be appropriately determined.
- FIG. 1A shows an example of single TRP inter-cell configuration.
- FIG. 1B shows an example of multi-TRP inter-cell configuration.
- FIG. 2 is a diagram of Rel. 15 A diagram showing an example of a beam recovery procedure in NR.
- FIG. 3 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment.
- FIG. 4 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- FIG. 5 is a diagram illustrating an example of the configuration of a user terminal according to one embodiment.
- FIG. 6 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to one embodiment.
- the reception processing e.g., reception, demapping, demodulation, decoding
- transmission processing e.g, at least one of transmission, mapping, precoding, modulation, encoding
- the TCI state may represent those that apply to downlink signals/channels.
- the equivalent of TCI conditions applied to uplink signals/channels may be expressed as spatial relations.
- the TCI state is information about the pseudo-colocation (QCL) of signals/channels, and may be called spatial reception parameters, spatial relation information, or the like.
- the TCI state may be set in the UE on a channel-by-channel or signal-by-signal basis.
- QCL is an index that indicates the statistical properties of a signal/channel. For example, when one signal/channel and another signal/channel have a QCL relationship, Doppler shift, Doppler spread, average delay ), delay spread, spatial parameters (e.g., spatial Rx parameter) are identical (QCL with respect to at least one of these). You may
- the spatial reception parameters may correspond to the reception beams of the UE (eg, reception analog beams), and the beams may be specified based on the spatial QCL.
- QCL or at least one element of QCL in the present disclosure may be read as sQCL (spatial QCL).
- QCL types may be defined for the QCL.
- QCL types AD may be provided with different parameters (or parameter sets) that can be assumed to be the same, and the parameters (which may be called QCL parameters) are shown below: QCL type A (QCL-A): Doppler shift, Doppler spread, mean delay and delay spread, QCL type B (QCL-B): Doppler shift and Doppler spread, QCL type C (QCL-C): Doppler shift and mean delay; • QCL Type D (QCL-D): Spatial reception parameters.
- CORESET Control Resource Set
- QCL QCL type D
- a UE may determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal/channel based on the TCI conditions or QCL assumptions of that signal/channel.
- Tx beam transmit beam
- Rx beam receive beam
- the TCI state may be, for example, information about the QCL between the channel of interest (in other words, the reference signal (RS) for the channel) and another signal (for example, another RS). .
- the TCI state may be set (indicated) by higher layer signaling, physical layer signaling or a combination thereof.
- Physical layer signaling may be, for example, downlink control information (DCI).
- DCI downlink control information
- Channels for which TCI states or spatial relationships are set are, for example, Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), Physical Uplink Shared Channel It may be at least one of a channel (PUSCH)) and an uplink control channel (Physical Uplink Control Channel (PUCCH)).
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Uplink Control Channel
- RSs that have a QCL relationship with the channel are, for example, a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a measurement reference signal (Sounding It may be at least one of a reference signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).
- SSB synchronization signal block
- CSI-RS channel state information reference signal
- Sounding It may be at least one of a reference signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called a QRS).
- SRS reference signal
- TRS tracking reference signal
- QRS QCL detection reference signal
- An SSB is a signal block that includes at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- PBCH Physical Broadcast Channel
- An SSB may also be called an SS/PBCH block.
- a QCL type X RS in a TCI state may mean an RS that has a QCL type X relationship with (the DMRS of) a certain channel/signal, and this RS is called a QCL type X QCL source in that TCI state.
- QCL type A RS is always set for PDCCH and PDSCH, and QCL type D RS may be additionally set. Since it is difficult to estimate Doppler shift, delay, etc. by receiving DMRS one-shot, QCL type A RS is used to improve channel estimation accuracy. QCL type D RS is used for receive beam determination during DMRS reception.
- TRS 1-1, 1-2, 1-3, 1-4 are transmitted, and TRS 1-1 is notified as QCL type C/D RS depending on the TCI status of PDSCH.
- the UE can use the information obtained from the past periodic TRS1-1 reception/measurement results for PDSCH DMRS reception/channel estimation.
- the PDSCH QCL source is TRS1-1 and the QCL target is the PDSCH DMRS.
- Multi-TRP In NR, one or more transmission/reception points (Transmission/Reception Points (TRP)) (multi TRP (multi TRP (MTRP))) uses one or more panels (multi-panel) to the UE DL transmission is under consideration. It is also being considered that the UE uses one or more panels to perform UL transmissions for one or more TRPs.
- TRP Transmission/Reception Points
- MTRP multi TRP
- a plurality of TRPs may correspond to the same cell identifier (cell identifier (ID)) or may correspond to different cell IDs.
- the cell ID may be a physical cell ID or a virtual cell ID.
- Multi-TRPs may be connected by ideal/non-ideal backhauls to exchange information, data, and the like.
- Different codewords (CW) and different layers may be transmitted from each TRP of the multi-TRP.
- Non-Coherent Joint Transmission NCJT may be used as one form of multi-TRP transmission.
- TRP#1 modulate-maps a first codeword and layer-maps a first number of layers (e.g., two layers) with a first precoding to transmit a first PDSCH.
- TRP#2 also modulates and layer-maps a second codeword to transmit a second PDSCH with a second number of layers (eg, 2 layers) with a second precoding.
- multiple PDSCHs to be NCJTed may be defined as partially or completely overlapping in at least one of the time and frequency domains. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap at least one of time and frequency resources.
- first PDSCH and second PDSCH are not quasi-co-located (QCL).
- Reception of multiple PDSCHs may be translated as simultaneous reception of PDSCHs that are not of a certain QCL type (eg, QCL type D).
- Multiple PDSCHs from multiple TRPs may be scheduled using one DCI (single DCI, single PDCCH) (single master mode, based on single DCI Multi-TRP (single-DCI based multi-TRP)).
- Multiple PDSCHs from multi-TRP may be scheduled using multiple DCIs (multi-DCI, multiple PDCCH) (multi-master mode, multi-DCI based multi-TRP (multiple PDCCH)). TRP)).
- PDSCH transport block (TB) or codeword (CW) repetition across multi-TRPs.
- repetition schemes URLLC schemes, eg schemes 1, 2a, 2b, 3, 4
- SDM space division multiplexed
- FDM frequency division multiplexed
- RV redundancy version
- the RVs may be the same or different for the multi-TRPs.
- multiple PDSCHs from multiple TRPs are time division multiplexed (TDM).
- TDM time division multiplexed
- multiple PDSCHs from multiple TRPs are transmitted within one slot.
- multiple PDSCHs from multiple TRPs are transmitted in different slots.
- one control resource set (CORESET) in PDCCH configuration information (PDCCH-Config) may correspond to one TRP.
- the UE may determine multi-TRP based on multi-DCI if at least one of the following conditions 1 and 2 is met: In this case, TRP may be read as a CORESET pool index.
- TRP may be read as a CORESET pool index.
- a CORESET pool index of 1 is set.
- Two different values (eg, 0 and 1) of the CORESET pool index are set.
- the UE may determine multi-TRP based on single DCI if the following conditions are met: In this case, two TRPs may be translated into two TCI states indicated by MAC CE/DCI. [conditions] "Enhanced TCI States Activation/Deactivation for UE- specific PDSCH MAC CE)” is used.
- DCI for common beam indication may be a UE-specific DCI format (e.g., DL DCI format (e.g., 1_1, 1_2), UL DCI format (e.g., 0_1, 0_2)), or a UE group common (UE-group common) DCI format.
- DL DCI format e.g., 1_1, 1_2
- UL DCI format e.g., 0_1, 0_2
- UE group common UE-group common
- the following Scenario 1 or Scenario 2 is conceivable as a multi-TRP procedure.
- the serving cell may be read as the TRP in the serving cell.
- L1/L2 signaling and MAC CE/DCI may be read interchangeably.
- a PCI that is different from the physical cell identity (PCI) of the serving cell (current serving cell) may be simply referred to as "different PCI”.
- the following procedure is performed.
- ⁇ Scenario 1> From the serving cell, the UE receives settings necessary for using radio resources for data transmission and reception, including SSB settings for beam measurement of TRPs having PCIs different from that of the serving cell, and resources for different PCIs. do. (2) The UE performs beam measurements for TRPs with different PCIs and reports beam measurement results to the serving cell. (3) Based on the above reports, TCI states associated with TRPs with different PCIs are activated by L1/L2 signaling from the serving cell. (4) UEs transmit and receive using UE dedicated channels on the TRP with different PCIs. (5) The UE should always cover the serving cell, even in the case of multi-TRP. The UE needs to use common channels (Broadcast Control Channel (BCCH), Paging Channel (PCH)) from the serving cell, etc., as in conventional systems.
- BCCH Broadcast Control Channel
- PCH Paging Channel
- Scenario 1 the 'serving cell' assumption is not changed when the UE transmits/receives signals to/from a non-serving cell/TRP (TRP with non-serving cell's PCI).
- the UE is configured with higher layer parameters related to PCI of non-serving cells from the serving cell.
- Scenario 1 is, for example, Rel. 17.
- Scenario 2 applies L1/L2 inter-cell mobility.
- L1/L2 inter-cell mobility allows serving cell changes using features such as beam control without RRC reconfiguration. In other words, it is possible to transmit to and receive from non-serving cells without handover. Since a data communication unavailable period occurs such as RRC reconnection is required for handover, data communication can be continued even when the serving cell is changed by applying L1/L2 inter-cell mobility that does not require handover. be able to.
- Scenario 2 is, for example, Rel. 18 may be applied. In Scenario 2, for example, the following procedure is performed.
- the UE receives from the serving cell the configuration of SSBs of cells with different PCIs (non-serving cells) for beam measurement/serving cell change.
- the UE performs beam measurements for cells using different PCIs and reports the measurement results to the serving cell.
- the UE may receive the configuration of cells with different PCIs (serving cell configuration) through higher layer signaling (eg, RRC). In other words, pre-configuration regarding serving cell change may be performed. This setting may be performed together with the setting in (1), or may be performed separately.
- the TCI states of cells with different PCIs may be activated by L1/L2 signaling according to the change of serving cell. Activating the TCI state and changing the serving cell may be done separately.
- the UE changes its serving cell and starts receiving/transmitting using the preconfigured UE-specific channel and TCI state.
- the serving cell assumption is updated by L1/L2 signaling.
- FIGS. 1A and 1B An example of inter-cell configuration (configuration in multiple cells) when the UE receives channels/signals from multiple cells/TRPs will be described using FIGS. 1A and 1B.
- FIG. 1A shows an example of single TRP inter-cell configuration.
- Single TRP may refer to the case where only one TRP out of multiple TRPs transmits to the UE (which may be referred to as single mode).
- the UE is from the base station/TRP of cell #1 (PCI#1), which is the serving cell, and the base station/TRP of cell #3 (Non-serving cell), which is not the serving cell (Non-serving cell) It shows the case of receiving a channel/signal.
- PCI#1 the base station/TRP of cell #1
- Non-serving cell Non-serving cell
- the serving cell of the UE switches (eg, fast cell switch) from cell #1 to cell #3.
- TCI state updates may be performed by DCI/MAC CE and port (eg, antenna port)/TRP/point selection may be performed dynamically.
- Different serving cell configurations may be applied/configured for PCI #1 and PCI #3 cells.
- FIG. 1B shows an example of multi-TRP inter-cell configuration.
- the UE is shown receiving channels/signals from TRP#1 and TRP2.
- TRP#1 exists in cell #1 (PCI#1)
- TRP#2 exists in cell #2 (PCI#2).
- NCJT may be performed between multiple cells (cells of different PCIs). Note that the same serving cell configuration may be applied/configured to TRP#1 and TRP#2.
- RLM radio link monitoring
- An RS used for RLM is called an RLM-RS.
- the UE may be configured with explicit RLM-RS (eg, SSB/CSI-RS), such as by higher layer signaling.
- the UE may be configured in the RLM with an implicit RLM-RS based on the TCI state of PDCCH/CORESET (the UE may determine the RLM-RS based on the TCI state).
- the explicit RLM-RS, implicit RLM-RS, etc. will be specifically described below.
- the UE may configure a set of resource indexes for each DL BWP of a special cell (SpCell) with a corresponding set of radio link monitoring reference signals (Radio Link Monitoring RS (RLM-RS)).
- This RLM-RS may be called an explicit RLM-RS.
- SpCell is a primary cell (PCell)/primary secondary cell (PSCell).
- the UE may receive configuration information for RLM (eg, RRC "RadioLinkMonitoringConfig” information element) via higher layer signaling.
- the RLM configuration information may include failure detection resource configuration information (eg, upper layer parameter “failureDetectionResourcesToAddModList”) and RLM-RS-related parameters (eg, upper layer parameter “RadioLinkMonitoringRS”).
- the UE may perform RLM using this configuration information.
- Parameters for RLM-RS information indicating that it corresponds to the purpose of RLM, an index corresponding to the resource of RLM-RS (eg, the index included in the upper layer parameter "failureDetectionResources") and the like may be included.
- the index may be, for example, a CSI-RS resource configuration index (eg, non-zero power CSI-RS resource ID) or an SS/PBCH block index (SSB index).
- the UE may identify the RLM-RS resource based on the index corresponding to the RLM-RS resource and perform RLM using the RLM-RS resource.
- RadioLinkMonitoringRS for RLM-RS (not configured by higher layer signaling)
- RLM-RS not configured by higher layer signaling
- the UE may use the RS provided for the active TCI state for PDCCH reception for RLM if that TCI state contains only one RS.
- An RS that includes (corresponds to) an active TCI state for PDCCH reception may be referred to as an implicit RLM-RS.
- the UE assumes (predicts) that one RS is configured with the QCL type "type D".
- the UE uses RSs configured with QCL type 'type D' for radio link monitoring.
- the UE does not assume (expect) that both RSs are configured with QCL type 'type D'.
- the UE may, in an order from the shortest monitoring periodicity )
- the N RLM RSs provided for active TCI states for PDCCH reception in the CORESET associated with the search space set may be selected as RLM RSs.
- the UE may determine the CORESETs in order from the largest CORESET index (or CORESET ID).
- the UE selects the search space set having the minimum monitoring period among the search space sets related to the CORESET, assuming that it has a higher priority. Also, the UE selects an RLM-RS based on a CORESET with a higher CORESET ID if more than one CORESET corresponds to the same minimum monitoring period search space set.
- BFD Beam Failure Detection
- BFR Beam Failure Recovery
- the UE and the base station e.g., gNB (gNodeB)
- the beam used for signal transmission transmission beam, Tx beam, etc.
- the beam used for signal reception reception beam, Rx beam, etc.
- Radio link failure may occur frequently due to deterioration of radio link quality. Since the occurrence of RLF requires cell reconnection, frequent occurrence of RLF causes degradation of system throughput.
- BFR beam recovery
- BFR beam failure recovery
- L1/L2 Layer 1/Layer 2
- a beam failure (BF) in the present disclosure may also be called a link failure.
- Fig. 2 shows Rel. 15 A diagram showing an example of a beam recovery procedure in NR.
- the number of beams, etc. is an example, and is not limited to this.
- the UE performs measurements based on reference signal (RS) resources transmitted using two beams.
- RS reference signal
- the RS may be at least one of a synchronization signal block (SSB) and a channel state measurement RS (Channel State Information RS (CSI-RS)).
- SSB may also be called an SS/PBCH (Physical Broadcast Channel) block.
- PBCH Physical Broadcast Channel
- RS is a primary synchronization signal (Primary SS (PSS)), a secondary synchronization signal (Secondary SS (SSS)), a mobility reference signal (Mobility RS (MRS)), a signal included in SSB, SSB, CSI-RS, for demodulation At least one of a reference signal (DeModulation Reference Signal (DMRS)), a beam-specific signal, etc., or a signal configured by extending or modifying these may be used.
- the RS measured in step S101 is an RS for beam failure detection (Beam Failure Detection RS (BFD-RS), an RS for beam failure detection), an RS (BFR-RS) for use in a beam recovery procedure, or the like.
- BFD-RS Beam Failure Detection RS
- BFR-RS RS for use in a beam recovery procedure, or the like.
- step S102 the UE cannot detect the BFD-RS (or the reception quality of the RS deteriorates) due to the radio waves from the base station being jammed.
- Such disturbances can be caused, for example, by effects such as obstacles, fading, and interference between the UE and the base station.
- the UE detects a beam failure when a predetermined condition is met.
- the UE may detect the occurrence of a beam failure, for example, when BLER (Block Error Rate) is less than a threshold for all configured BFD-RSs (BFD-RS resource configuration).
- BLER Block Error Rate
- BFD-RS resource configuration a threshold for all configured BFD-RSs
- the lower layer (physical (PHY) layer) of the UE may notify (indicate) the beam failure instance to the upper layer (MAC layer).
- the criteria for determination are not limited to BLER, and may be the reference signal received power (Layer 1 Reference Signal Received Power (L1-RSRP)) in the physical layer.
- L1-RSRP Layer 1 Reference Signal Received Power
- beam failure detection may be performed based on a physical downlink control channel (PDCCH) or the like.
- BFD-RS may be expected to be Quasi-Co-Location (QCL) with the DMRS of the PDCCH monitored by the UE.
- QCL is an index that indicates the statistical properties of a channel. For example, if one signal/channel and another signal/channel have a QCL relationship, between these different signals/channels, Doppler shift, Doppler spread, average delay ), delay spread, spatial parameter (e.g., spatial Rx Parameter) are the same (QCL with respect to at least one of these). You may
- the spatial reception parameters may correspond to the reception beams of the UE (eg, reception analog beams), and the beams may be specified based on the spatial QCL.
- QCL or at least one element of QCL in the present disclosure may be read as sQCL (spatial QCL).
- Information on BFD-RS eg, RS index, resource, number, number of ports, precoding, etc.
- BFD beam failure detection
- Information on BFD-RS may be set (notified) to Information about BFD-RS may be called information about BFR resources.
- a higher layer (eg, MAC layer) of the UE may start a predetermined timer (which may be referred to as a beam failure detection timer) when receiving a beam failure instance notification from the PHY layer of the UE.
- a predetermined timer which may be referred to as a beam failure detection timer
- the MAC layer of the UE receives beam failure instance notifications a certain number of times (for example, beamFailureInstanceMaxCount set by RRC) or more before the timer expires, it triggers BFR (for example, starts one of the random access procedures described later ).
- the base station may determine that the UE has detected a beam failure when there is no notification from the UE or when a predetermined signal (beam recovery request in step S104) is received from the UE.
- step S103 the UE starts searching for a new candidate beam to be newly used for communication for beam recovery.
- the UE may select a new candidate beam corresponding to that RS.
- RSs measured in step S103 are new candidate RS, RS for new candidate beam identification, NCBI-RS (New Candidate Beam Identification RS), RS for new beam identification, RS for new beam identification, NBI-RS (New Beam Identification RS), CBI-RS (Candidate Beam Identification RS), CB-RS (Candidate Beam RS), etc.
- NBI-RS may be the same as or different from BFD-RS. Note that the new candidate beam may be simply called a candidate beam or a candidate RS.
- a UE may determine a beam corresponding to an RS that satisfies a predetermined condition as a new candidate beam.
- the UE may determine new candidate beams based on, for example, the configured NBI-RSs whose L1-RSRP exceeds the threshold. Note that the criteria for judgment are not limited to L1-RSRP.
- L1-RSRP for SSB may be referred to as SS-RSRP.
- L1-RSRP for CSI-RS may be referred to as CSI-RSRP.
- NBI-RS e.g. resources, number of RSs, number of ports, precoding, etc.
- NBI new beam identification
- Information about new candidate RSs may be obtained based on information about BFD-RSs.
- Information about NBI-RS may be called information about resources for NBI or the like.
- BFD-RS may be interchanged with radio link monitoring reference signals (Radio Link Monitoring RS (RLM-RS)).
- RLM-RS Radio Link Monitoring RS
- step S104 the UE that has identified the new candidate beam transmits a beam failure recovery request (BFRQ).
- a beam recovery request may also be referred to as a beam recovery request signal, a beam failure recovery request signal, or the like.
- BFRQ for example, physical uplink control channel (PUCCH), random access channel (PRACH), physical uplink shared channel (PUSCH), configured (setting) It may be transmitted using at least one of a configured grant (CG) PUSCH.
- PUCCH physical uplink control channel
- PRACH random access channel
- PUSCH physical uplink shared channel
- CG configured grant
- the BFRQ may include information on the new candidate beam/new candidate RS identified in step S103.
- Resources for BFRQ may be associated with the new candidate beam.
- Beam information includes beam index (BI), port index of predetermined reference signal, RS index, resource index (for example, CSI-RS resource indicator (CRI)), SSB resource index (SSBRI)) or the like.
- CB-BFR Contention-Based BFR
- CF-BFR Contention-Free BFR
- a UE may transmit a preamble (also called an RA preamble, a Physical Random Access Channel (PRACH), a RACH preamble, etc.) as a BFRQ using PRACH resources.
- a preamble also called an RA preamble, a Physical Random Access Channel (PRACH), a RACH preamble, etc.
- the UE may transmit a randomly selected preamble from one or more preambles.
- the UE may transmit a UE-specific assigned preamble from the base station.
- the base station may assign the same preamble to multiple UEs.
- the base station may assign preambles for individual UEs.
- CB-BFR and CF-BFR are respectively referred to as CB PRACH-based BFR (contention-based PRACH-based BFR (CBRA-BFR)) and CF PRACH-based BFR (contention-free PRACH-based BFR (CFRA-BFR)).
- CBRA-BFR may be referred to as CBRA for BFR
- CFRA-BFR may be referred to as CFRA for BFR.
- information on PRACH resources may be notified by higher layer signaling (RRC signaling, etc.), for example.
- RRC signaling may include information indicating the correspondence between detected DL-RSs (beams) and PRACH resources, and different PRACH resources may be associated with each DL-RS.
- the base station that detected the BFRQ transmits a response signal (which may be called a gNB response or the like) to the BFRQ from the UE.
- the response signal may include reconfiguration information (eg, DL-RS resource configuration information) for one or more beams.
- the response signal may be transmitted, for example, in the UE common search space of PDCCH.
- the response signal is reported using a cyclic redundancy check (CRC) scrambled PDCCH (DCI) by the UE identifier (eg, cell-radio RNTI (Cell-Radio RNTI (C-RNTI))) may be The UE may determine which transmit beam and/or receive beam to use based on the beam reconstruction information.
- CRC cyclic redundancy check
- DCI cell-radio RNTI
- C-RNTI Cell-Radio RNTI
- the UE may monitor the response signal based on at least one of the BFR control resource set (CControl Resource SET (CORESET)) and the BFR search space set.
- CControl Resource SET CORESET
- contention resolution may be determined to be successful when the UE receives the PDCCH corresponding to the C-RNTI for itself.
- a period may be set for the UE to monitor the response from the base station (eg, gNB) to BFRQ.
- the time period may be referred to, for example, as a gNB response window, a gNB window, a beam recovery request response window, and the like.
- the UE may retransmit the BFRQ if no gNB response is detected within the window period.
- the UE may send a message to the base station indicating that the beam reconstruction is complete.
- the message may be transmitted by PUCCH or PUSCH, for example.
- Beam recovery success may represent, for example, the case of reaching step S106.
- a beam recovery failure may correspond, for example, to reaching a predetermined number of BFRQ transmissions or to expiring a beam failure recovery timer (Beam-failure-recovery-Timer).
- Rel. 15 supports beam recovery procedures (eg, BFRQ notification) for beam failures detected in SpCells (PCell/PSCell) using random access procedures.
- the beam recovery procedure for the beam failure detected in the SCell eg, notification of BFRQ
- PUCCH for BFR eg, scheduling request (SR)
- MAC CE for BFR eg, UL-SCH
- the UE may transmit information about beam failures using MAC CE-based two-step.
- the information about beam failure may include information about the cell that detected the beam failure and information about the new candidate beam (or new candidate RS index).
- Step 1 When BF is detected, the UE may transmit a PUCCH-BFR (scheduling request (SR)) to the PCell/PSCell. A UL grant (DCI) for step 2 below may then be sent from the PCell/PSCell to the UE.
- PUCCH-BFR scheduling request
- DCI UL grant
- Step 2 The UE then sends information about the cell in which the beam failure was detected (failed) (e.g., cell index) and information about the new candidate beam using MAC CE via an uplink channel (e.g., PUSCH) to You may transmit to a base station (PCell/PSCell).
- a base station PCell/PSCell
- the QCL of PDCCH/PUCCH/PDSCH/PUSCH may be updated to a new beam.
- step numbers are merely numbers for explanation, and multiple steps may be grouped together or their order may be changed. Also, whether or not to implement BFR may be configured in the UE using higher layer signaling.
- BFD-RS/NBI-RS BFD-RS/NBI-RS
- the UE may be configured with explicit BFD-RS (eg, SSB/CSI-RS), such as by higher layer signaling.
- the UE may be configured with an implicit BFD-RS based on the TCI state of PDCCH/CORESET in BFD (the UE may determine the BFD-RS based on the TCI state).
- the UE may be configured with explicit NBI-RS (eg, SSB/CSI-RS) by higher layer signaling or the like.
- the explicit BFD-RS, the implicit BFD-RS, the explicit NBI-RS, etc. will be specifically described below.
- the UE sets q 0 bar of periodic (P)-CSI-RS resource configuration index by failureDetectionResources and candidate beam RS list (candidateBeamRSList) or extension at least one set of P-CSI-RS resource configuration index and SS/PBCH block index q 1 bar by candidate beam RS list (candidateBeamRSListExt-r16) or candidate beam RS list for SCell (candidateBeamRSSCellList-r16); can
- the q 0 bar is the notation with "q 0 " overlined. Below, the q0 bar is simply denoted as q0 .
- the q 1 bar is the notation with "q 1 " overlined. Below, the q 1 bar is simply denoted as q 1 .
- the set q 0 of P-CSI-RS resources provided by failure detection resources may be referred to as explicit BFD-RS.
- Set q 1 may be called Explicit New Beam Identification (NBI)-RS.
- the UE may perform L1-RSRP measurements, etc., using RS resources corresponding to indices in at least one of set q 0 and set q 1 to detect beam failure.
- providing the above-described upper layer parameter indicating the information of the index corresponding to the BFD resource can be interpreted as setting the BFD resource, setting the BFD-RS, etc.
- BFD resources, periodic CSI-RS resource configuration index or SSB index set q 0 , and BFD-RS may be read interchangeably.
- the UE If the UE is not provided with q 0 by failureDetectionResources for one BWP of its serving cell, indicated by the TCI-State for the corresponding CORESET that the UE uses for PDCCH monitoring. It decides to include in set q 0 a P-CSI-RS resource configuration index that has the same value as the RS index in the RS set. If there are two RS indices in one TCI state, set q 0 contains RS indices with QCL type D configuration for the corresponding TCI state. The UE assumes that set q 0 contains up to two RS indices. The UE assumes a single-port RS within its set q 0 .
- This set q 0 may be called implicit BFD-RS.
- the physical layer in the UE evaluates the radio link quality according to a set of resource configurations q 0 against a threshold Q out,LR .
- the UE has a P-CSI-RS resource configuration quasi-colocated with DM-RS for PDCCH reception monitored by the UE or quasi-colocated with DM-RS for PDCCH reception monitored by the UE.
- the radio link quality is evaluated according to the SS/PBCH block on the PCell or PSCell.
- BFD-RS is QCLed with PDCCH (there is a QCL relationship).
- TRP-specific link recovery (BFD/BFR) on the Component Carrier (CC) may be performed.
- Rel. 17 may be replaced with other release numbers (for example, numbers after Rel. 18).
- the UE may be configured with two sets of explicit BFD-RS (eg, SSB/CSI-RS) for single DCI/multi-DCI based multi-TRP, such as by higher layer signaling.
- the UE may be configured with implicit BFD-RS for single DCI/multi-DCI-based multi-TRP based on the TCI state of PDCCH/CORESET in BFD (the UE may be configured based on the TCI state may determine BFD-RS for single DCI/multi-DCI based multi-TRP).
- the UE may be configured with two sets of explicit NBI-RS (eg, SSB/CSI-RS) for single DCI/multi-DCI based multi-TRP, such as by higher layer signaling.
- the UE configures / determines one set of RLM-RS / BFD-RS / NBI-RS by inter-cell configuration (configuration in multiple cells) in a single TRP, the configuration is associated with different PCI It is not clear whether inclusion of RLM-RS/BFD-RS/NBI-RS will be supported.
- the UE when the UE configures/determines two sets of BFD-RS/NBI-RS by TRP-specific BFR and multi-TRP inter-cell configuration, the configuration includes BFD-RS/ It is not clear whether the inclusion of NBI-RS will be supported.
- the UE is configured with PRACH-ResourceDedicatedBFR for Pcell/PSCell in Contention Free Random Access (CFRA) of BFR in all scenarios (for example, scenario 1 or scenario 2, single TRP/multi-TRP) In that case, it is not clear whether to support cells with different PCIs.
- CFRA Contention Free Random Access
- the present inventors conceived of a terminal that can appropriately determine the RS to be used for at least one of RLM, BFD, and BFR.
- A/B/C and “at least one of A, B and C” may be read interchangeably.
- cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, band may be read interchangeably.
- index, ID, indicator, and resource ID may be read interchangeably.
- supporting, controlling, controllable, operating, and capable of operating may be read interchangeably.
- configure, activate, update, indicate, enable, specify, and select may be read interchangeably.
- higher layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- RRC, RRC signaling, RRC parameters, higher layers, higher layer parameters, RRC information elements (IEs), RRC messages may be read interchangeably.
- Broadcast information includes, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), and other system information ( It may be Other System Information (OSI).
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI System Information
- MAC CE and activation/deactivation commands may be read interchangeably.
- pool, set, group, list, and candidate may be read interchangeably.
- beams, spatial domain filters, spatial settings, TCI states, UL TCI states, unified TCI states, unified beams, common TCI states, common beams, TCI assumptions, QCL assumptions, QCL parameters, spatial Domain Receive Filter, UE Spatial Domain Receive Filter, UE Receive Beam, DL Beam, DL Receive Beam, DL Precoding, DL Precoder, DL-RS, TCI State/QCL Assumed QCL Type D RS, TCI State/QCL Assumed QCL type A RS, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoding, UL precoder, PL-RS may be read interchangeably.
- QCL type X-RS, DL-RS associated with QCL type X, DL-RS with QCL type X, source of DL-RS, SSB, CSI-RS, SRS may be read interchangeably. good.
- common beam common TCI, common TCI state, unified TCI, unified TCI state, TCI state applicable to DL and UL, TCI state applicable to multiple (multiple types) of channels/RS, multiple types of The TCI states applicable to the channel/RS, PL-RS, may be interchanged.
- Common, unified, and joint may be read interchangeably.
- TCI state multiple TCI states set by RRC, multiple TCI states activated by MAC CE, pool, TCI state pool, active TCI state pool, common TCI state pool, joint TCI state pool, separate
- the TCI state pool, the common TCI state pool for UL, the common TCI state pool for DL, the common TCI state pool configured/activated by RRC/MAC CE, and the TCI state information may be read interchangeably.
- the panel Uplink (UL) transmitting entity, TRP, spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, codeword, base station, antenna port of a signal (e.g., reference signal for demodulation (DeModulation Reference Signal (DMRS)) port), antenna port group for a signal (e.g. DMRS port group), group for multiplexing (e.g. Code Division Multiplexing (CDM) group, reference signal group, CORESET group), CORESET pool, CORESET subset, CW, redundancy version (RV), layers (MIMO layer, transmission layer, spatial layer) may be read interchangeably. Also, panel identifier (ID) and panel may be read interchangeably.
- DMRS DeModulation Reference Signal
- the TRP ID, the TRP related ID, the CORESET pool index, the position of one of the two TCI states corresponding to one codepoint of the field in the DCI (ordinal number, first TCI state or second TCI state ) and TRP may be read interchangeably.
- TRP transmission point
- panel DMRS port group
- CORESET pool one of two TCI states associated with one codepoint of the TCI field may be read interchangeably.
- CORESETPoolIndex CORESET Pool Index
- multiple TCI state/spatial relationships enabled by RRC/DCI and/or multi-TRP based on single DCI and multi-TRP based on multiple DCIs may be read interchangeably.
- multi-TRPs based on multi-DCI setting a CORESET pool index (CORESETPoolIndex) value of 1 for a CORESET, may be read interchangeably.
- multiple TRPs based on a single DCI, where at least one codepoint of a TCI field is mapped to two TCI states may be read interchangeably.
- TRP#1 first TRP
- TRP#2 second TRP
- TRP#1 first TRP
- TRP#2 second TRP
- cells, serving cells, CCs, BWPs, BWPs in CCs, and bands may be read interchangeably.
- non-serving cell cell with different PCI
- candidate serving cell cell with PCI different from current serving cell's PCI
- another serving cell may be interchanged.
- Different PCI, second PCI, non-serving cell PCI, serving cell PCI (PCI corresponding to current serving cell, first PCI) and different PCI may be interchanged.
- Dedicated and specific may be read interchangeably.
- RS Resource Management Function
- RLM-RS RLM-RS
- BFD-RS BFD-RS
- NBI-RS Synchronization Signal block
- SSB Synchronization Signal block
- CSI-RS CSI-RS resource
- CSI-RS resource configuration index may be read interchangeably. good.
- the SSB and SS/PBCH blocks may be read interchangeably.
- CSI-RS may be periodic, semi-persistent, or aperiodic.
- the TCI state of PDCCH, the TCI state for PDCCH reception, the active TCI state for PDCCH reception, and the RSs included in the TCI state of PDCCH may be read interchangeably.
- PDCCH and CORESET may be read interchangeably. Consideration, assumption and determination may be read interchangeably.
- Having different PCIs, corresponding to/associating with different PCIs, and being associated with different PCIs may be read interchangeably.
- RSs with different PCIs, RSs corresponding to/associated with cells with different PCIs, and RSs from cells with different PCIs (RSs transmitted from cells with different PCIs) may be read interchangeably.
- the UE may activate if the RSs of cells with different PCIs (RSs associated with different PCIs) are configured for beam measurement or TCI states associated with different PCIs (e.g. TCI states of PDCCH) are activated. If so, the radio link monitoring reference signal (RLM-RS) configuration/determination may follow one of the following options.
- RLM-RS radio link monitoring reference signal
- the UE receives an RS associated with a PCI (second PCI) different from the PCI (first PCI) corresponding to the serving cell as the RLM-RS, and uses the received RS to control the RLM. (Option 1-1).
- the UE may receive the RS (first PCI) associated with the PCI corresponding to the serving cell as the RLM-RS and use the received RS for RLM (option 1-2).
- the UE is explicitly configured with one set of RLM-RS (eg, the case of using the explicit RLM-RS described above), or implicitly one set of RLM-RS It is applicable in the case of determination (eg, the case of using implicit RLM-RS described above). That is, the RS in this embodiment may be an explicit RLM-RS or an implicit RLM-RS.
- [Option 1-1] UE as an RLM-RS, without considering (assuming) whether the TCI state of the RS (eg, SSB) or PDCCH has a different PCI, even according to a predetermined rule (eg, the procedure described in (RLM) above) good.
- the UE considers (assumes) the TCI state of the RS (eg, SSB) associated with a different PCI or the TCI state of the PDCCH associated with a different PCI, as the RLM-RS, a predetermined rule (eg, described in (RLM) above procedure) may be followed.
- the RLM-RS set may include RSs associated with different PCIs in addition to RSs from the serving cell's PCI (RSs with the serving cell's PCI).
- One or more RSs associated with different PCIs within an RLM-RS set may be associated with the same PCI. This means that one or more RSs associated with at most one different PCI cell can be included in the RLM-RS.
- One or more RSs associated with different PCIs within the RLM-RS set may be associated with multiple different PCIs.
- the UE may not consider (assume) RSs (eg, SSB) associated with different PCIs or the TCI status of the PDCCH.
- the UE may consider (assume) the TCI status of the RS or PDCCH corresponding to the RLM-RS from the PCI of the serving cell only.
- the UE may determine the RLM-RS from the RSs associated with the serving cell's PCI only or from the RSs in the TCI state associated with the serving cell's PCI only.
- Options 1-2 may be applied for cell-specific BFR.
- the UE may assume that the RLM-RS is only associated with the serving cell PCI if the RLM-RS is configured.
- the UE may implicitly derive (determine) the RLM-RS associated with the PCI of the serving cell only if the RLM-RS is not configured.
- Options 1-2 may be applied to BFD-RS/NBI-RS as well. That is, RLM-RS may be replaced with BFD-RS/NBI-RS, and RLM may be replaced with BFD/BFR.
- the UE may not consider RSs (eg, SSB) of PDCCHs associated with different PCIs or TCI states associated with different PCIs.
- the UE may consider/determine RSs associated with non-serving cell's PCI only or RSs in TCI state of PDCCH associated with non-serving cell's PCI only as RLM-RS. That is, the UE may receive the RS associated with the non-serving cell's PCI and use the RS to control the RLM. This allows proper control of the RLM using the non-serving cell's PCI.
- the UE may switch between options 1-2 and 1-3 depending on the indicated TCI state, etc. For example, if the TCI status of a particular channel/RS/CORESET is associated with the serving cell's PCI, then options 1-2 may be applied, and if it is associated with the non-serving cell's PCI, then options 1-3 may be applied.
- Each of the above options may be applied when the corresponding configuration (eg, inter-cell BFR) is performed by higher layer signaling (eg, RRC).
- option 1-1 may be applied if the corresponding setting is made by corresponding higher layer signaling
- option 1-2 may be applied if the setting is not made.
- option 1-2 If option 1-2 is applied and RLM-RS/BFD-RS/NBI-RS is configured, the UE assumes that RLM-RS/BFD-RS/NBI-RS is associated only with the serving cell PCI. can be assumed. Also, the UE implicitly derives (determines) the RLM-RS/BFD-RS associated with the PCI of the serving cell only when option 1-2 is applied and RLM-RS/BFD-RS is not configured. ). Option 1-1 may be applied if there are corresponding settings in the new parameters (eg RRC parameters (such as inter-cell BFR)).
- RRC parameters such as inter-cell BFR
- the first embodiment it is possible to appropriately determine the RSs used for RLM control when using a plurality of cells, and to perform RLM control appropriately.
- the UE has two sets of RSs when the RSs of cells with different PCIs (RSs associated with different PCIs) are configured for beam measurement or when TCI states associated with different PCIs are activated.
- BFD-RS configuration/determination may follow any of the following options.
- BFD-RS and NBI-RS in this embodiment may be interchanged, and BFD and BFR may be interchanged.
- the UE receives an RS associated with a different PCI (second PCI) from the PCI corresponding to the serving cell (first PCI) as BFD-RS or NBI-RS, and uses the received RS BFD or BFR may be controlled (option 2-1).
- the UE may receive RS associated with the PCI (first PCI) corresponding to the serving cell as BFD-RS or NBI-RS, and control BFD or BFR using the received RS ( Option 2-2).
- This embodiment applies when two sets of BFD-RS are explicitly configured (for example, when the above explicit BFD-RS is applied), or in a multi-TRP scenario with TRP-specific BFRs (single DCI or multiple It is applicable when two sets of BFD-RS are implicitly determined in DCI) (for example, when the above implicit BFD-RS is applied). That is, the RS in this embodiment may be an explicit BFD-RS or an implicit BFD-RS. Also, the RS in this embodiment may be an explicit NBI-RS.
- the UE may consider (assume) the TCI states of the RS or PDCCH associated with different PCIs as two sets of BFD-RS. That is, a UE may receive RSs associated with different PCIs or included in TCI states of PDCCHs associated with different PCIs as two sets of BFD-RSs.
- the UE uses ⁇ Rel. BFD/BFR> in 17 may be performed.
- the UE may consider the TCI status of RSs or PDCCHs associated with different PCIs only for the second set of BFD-RSs. Also, the RSs in the second set of BFD-RSs may all be associated with the same PCI. The UE may consider the TCI status of the RS or PDCCH using the serving cell PCI only in the first set of BFD-RS.
- the processing described above (BFD-RS/NBI-RS) may be applied within each PCI.
- the UE may not consider (assume) the TCI status of the RSs associated with different PCIs or the PDCCHs associated with different PCIs as the two sets of BFD-RSs. That is, the two sets of BFD-RSs may not be RSs associated with different PCIs, nor may they be RSs included in TCI states of PDCCHs associated with different PCIs.
- the UE may consider the TCI status of the RS or PDCCH associated with the serving cell PCI as two sets of BFD-RS. That is, the two sets of BFD-RSs may be the RSs associated with the serving cell PCI or the RSs included in the TCI state of the PDCCH associated with the serving cell PCI.
- the UE assumes that the BFD-RS/NBI-RS is associated only with the PCI of the serving cell if the BFD-RS/NBI-RS is configured.
- the UE implicitly derives (determines) the BFD-RS associated with the serving cell PCI only if BFD-RS is not configured.
- the UE may not consider RSs (eg, SSB) of PDCCHs associated with different PCIs or TCI states associated with different PCIs.
- the UE may consider/determine as BFD-RS/NBI-RS RSs associated with non-serving cell's PCI only or RSs in TCI state of PDCCH associated with non-serving cell's PCI only. That is, the UE may receive the RS associated with the non-serving cell's PCI and use the RS to control BFD/BFR. This allows the BFD/BFR to be appropriately controlled using the PCI of the non-serving cell.
- RSs eg, SSB
- the UE may switch between options 2-2 and 2-3 depending on the indicated TCI state, etc. For example, if the TCI status of a particular channel/RS/CORESET is associated with the serving cell's PCI, option 2-2 may be applied, and if it is associated with the non-serving cell's PCI, option 2-3 may be applied.
- Each of the above options may be applied when the corresponding configuration (eg, inter-cell BFR) is performed by higher layer signaling (eg, RRC).
- higher layer signaling eg, RRC
- option 2-1 is applied when the corresponding setting is performed by the corresponding higher layer signaling
- option 2-2 is applied when the setting is not performed. good too.
- option 2-2 If option 2-2 is applied and BFD-RS/NBI-RS is configured, the UE assumes that RLM-RS/BFD-RS/NBI-RS is associated only with the serving cell PCI good. The UE may also implicitly derive (determine) the BFD-RS associated with the PCI of the serving cell only if option 2-2 is applied and BFD-RS is not configured.
- Option 2-1 may be applied if corresponding settings are made in the new parameters (eg RRC parameters (such as inter-cell BFR)).
- Option 2-1/2-2/2-3 may also apply to NBI-RS configuration of two sets of TRP-specific BFRs.
- BFD-RS/NBI-RS BFD-RS/NBI-RS
- each MTRP scheme single DCI-based or multi-DCI-based
- different CCs SpCell/SCell
- Option 2-1 may be applied to TRP-specific BFRs.
- the second embodiment it is possible to appropriately determine the RSs used for BFD/BFR control when using a plurality of cells, and to appropriately perform BFD/BFR control.
- UE if PRACH transmission configuration (PRACH-ResourceDedicatedBFR) for CFRA-BFR of Pcell / PSCell is configured (when receiving PRACH transmission configuration), the following option 3-1 or option 3-2 may be applied.
- PRACH transmission setting and the PRACH setting may be read interchangeably.
- the configuration for PRACH transmission may be configured only in the PCI of the serving cell. Also, PRACH transmission configurations may not include PRACH configurations associated with cells with different PCIs. The UE may not be expected (or may not) perform CFRA-based BFR for cells with different PCIs. The configuration for PRACH transmission may not contain information for non-serving cells.
- the configuration for PRACH transmission may support PRACH configurations associated with cells with different PCIs. That is, the UE may receive PRACH transmission configurations corresponding to (associated with) cells with different PCIs and control BFR based on the configuration. All PRACH resources may be associated with the same PCI (serving cell PCI or non-serving cell PCI). Each PRACH resource may be associated with a different PCI (eg, a serving cell's PCI and a non-serving cell's PCI). The non-serving cell PCI in the PRACH configuration may be aligned with the non-serving cell PCI in the NBI-RS configuration. The configuration for PRACH transmission may not contain information for non-serving cells.
- the PRACH settings used for BFR control when using a plurality of cells are appropriately set, and the BFR can be appropriately controlled.
- the UE may transmit (report) UE capability information to the network (base station) indicating whether to support at least one of the processes in the present disclosure, and only when transmitting the UE capability, the corresponding processing may be performed. Also, the UE may receive information for instructing/configuring at least one of the processes in the present disclosure through DCI/MAC CE/higher layer signaling (eg, RRC) or the like. The information may correspond to UE capability information sent by the UE.
- UE capability information may be, for example, at least one of the following:
- the BFD-RS set may be one BFD-RS set for cell-specific BFR.
- the BFD-RS sets are two BFD-RS sets for TRP-specific BFR, and single DCI-based multi-TRP or multi-DCI-based multi-RP may be applied.
- the NBI-RS set may be one NBI-RS set for cell-specific BFR.
- the NBI-RS sets are two NBI-RS sets for TRP-specific BFR, and single DCI-based multi-TRP or multi-DCI-based multi-RP may be applied.
- wireless communication system A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below.
- communication is performed using any one of the radio communication methods according to the above embodiments of the present disclosure or a combination thereof.
- FIG. 3 is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by the Third Generation Partnership Project (3GPP). .
- LTE Long Term Evolution
- 5G NR 5th generation mobile communication system New Radio
- 3GPP Third Generation Partnership Project
- the wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- RATs Radio Access Technologies
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)), etc.
- RATs Radio Access Technologies
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E -UTRA Dual Connectivity (NE-DC)), etc.
- LTE Evolved Universal Terrestrial Radio Access
- EN-DC E-UTRA-NR Dual Connectivity
- NE-DC NR-E -UTRA Dual Connectivity
- the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN).
- the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.
- the wireless communication system 1 has dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB) )) may be supported.
- dual connectivity NR-NR Dual Connectivity (NN-DC) in which both MN and SN are NR base stations (gNB)
- gNB NR base stations
- a wireless communication system 1 includes a base station 11 forming a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) arranged in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. You may prepare.
- a user terminal 20 may be located within at least one cell. The arrangement, number, etc. of each cell and user terminals 20 are not limited to the embodiment shown in the figure.
- the base stations 11 and 12 are collectively referred to as the base station 10 when not distinguished.
- the user terminal 20 may connect to at least one of the multiple base stations 10 .
- the user terminal 20 may utilize at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)).
- Macrocell C1 may be included in FR1, and small cell C2 may be included in FR2.
- FR1 may be a frequency band below 6 GHz (sub-6 GHz)
- FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a higher frequency band than FR2.
- the user terminal 20 may communicate using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- a plurality of base stations 10 may be connected by wire (for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
- wire for example, an optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) is an IAB Also called a node.
- IAB Integrated Access Backhaul
- relay station relay station
- the base station 10 may be connected to the core network 30 directly or via another base station 10 .
- the core network 30 may include, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), and the like.
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal compatible with at least one of communication schemes such as LTE, LTE-A, and 5G.
- a radio access scheme based on orthogonal frequency division multiplexing may be used.
- OFDM orthogonal frequency division multiplexing
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a radio access method may be called a waveform.
- other radio access schemes for example, other single-carrier transmission schemes and other multi-carrier transmission schemes
- the UL and DL radio access schemes may be used as the UL and DL radio access schemes.
- a downlink shared channel Physical Downlink Shared Channel (PDSCH)
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- PDCCH Physical Downlink Control Channel
- an uplink shared channel (PUSCH) shared by each user terminal 20 an uplink control channel (PUCCH), a random access channel (Physical Random Access Channel (PRACH)) or the like may be used.
- PUSCH uplink shared channel
- PUCCH uplink control channel
- PRACH Physical Random Access Channel
- User data, upper layer control information, System Information Block (SIB), etc. are transmitted by the PDSCH.
- User data, higher layer control information, and the like may be transmitted by PUSCH.
- a Master Information Block (MIB) may be transmitted by the PBCH.
- Lower layer control information may be transmitted by the PDCCH.
- the lower layer control information may include, for example, downlink control information (DCI) including scheduling information for at least one of PDSCH and PUSCH.
- DCI downlink control information
- the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc.
- the DCI that schedules PUSCH may be called UL grant, UL DCI, etc.
- PDSCH may be replaced with DL data
- PUSCH may be replaced with UL data.
- a control resource set (CControl Resource SET (CORESET)) and a search space (search space) may be used for PDCCH detection.
- CORESET corresponds to a resource searching for DCI.
- the search space corresponds to the search area and search method of PDCCH candidates.
- a CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with certain search spaces based on the search space settings.
- One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set. Note that “search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. in the present disclosure may be read interchangeably.
- PUCCH channel state information
- acknowledgment information for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.
- SR scheduling request
- a random access preamble for connection establishment with a cell may be transmitted by the PRACH.
- downlink, uplink, etc. may be expressed without adding "link”.
- various channels may be expressed without adding "Physical" to the head.
- synchronization signals SS
- downlink reference signals DL-RS
- the DL-RS includes a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DeModulation Reference Signal (DMRS)), Positioning Reference Signal (PRS)), Phase Tracking Reference Signal (PTRS)), etc.
- CRS cell-specific reference signal
- CSI-RS channel state information reference signal
- DMRS Demodulation reference signal
- PRS Positioning Reference Signal
- PTRS Phase Tracking Reference Signal
- the synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- a signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called SS/PBCH block, SS Block (SSB), and so on.
- SS, SSB, etc. may also be referred to as reference signals.
- DMRS may also be called a user terminal-specific reference signal (UE-specific reference signal).
- FIG. 4 is a diagram illustrating an example of the configuration of a base station according to one embodiment.
- the base station 10 comprises a control section 110 , a transmission/reception section 120 , a transmission/reception antenna 130 and a transmission line interface 140 .
- One or more of each of the control unit 110, the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission line interface 140 may be provided.
- this example mainly shows the functional blocks that characterize the present embodiment, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 110 controls the base station 10 as a whole.
- the control unit 110 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (eg, resource allocation, mapping), and the like.
- the control unit 110 may control transmission/reception, measurement, etc. using the transmission/reception unit 120 , the transmission/reception antenna 130 and the transmission line interface 140 .
- the control unit 110 may generate data to be transmitted as a signal, control information, a sequence, etc., and transfer them to the transmission/reception unit 120 .
- the control unit 110 may perform call processing (setup, release, etc.) of communication channels, state management of the base station 10, management of radio resources, and the like.
- the transmitting/receiving section 120 may include a baseband section 121 , a radio frequency (RF) section 122 and a measuring section 123 .
- the baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212 .
- the transmitting/receiving unit 120 is configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure. be able to.
- the transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of the transmission processing section 1211 and the RF section 122 .
- the receiving section may be composed of a reception processing section 1212 , an RF section 122 and a measurement section 123 .
- the transmitting/receiving antenna 130 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 120 may receive the above-described uplink channel, uplink reference signal, and the like.
- the transmitting/receiving unit 120 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 120 (transmission processing unit 1211) performs Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control for example, HARQ retransmission control
- the transmission/reception unit 120 (transmission processing unit 1211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (DFT) on the bit string to be transmitted. Processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, transmission processing such as digital-to-analog conversion may be performed, and the baseband signal may be output.
- channel coding which may include error correction coding
- modulation modulation
- mapping mapping
- filtering filtering
- DFT discrete Fourier transform
- DFT discrete Fourier transform
- the transmitting/receiving unit 120 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 130. .
- the transmitting/receiving unit 120 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 130.
- the transmission/reception unit 120 (reception processing unit 1212) performs analog-to-digital conversion, Fast Fourier transform (FFT) processing, and Inverse Discrete Fourier transform (IDFT) processing on the acquired baseband signal. )) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing. User data and the like may be acquired.
- FFT Fast Fourier transform
- IDFT Inverse Discrete Fourier transform
- the transmitting/receiving unit 120 may measure the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, etc. based on the received signal.
- the measurement unit 123 measures received power (for example, Reference Signal Received Power (RSRP)), reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)) , signal strength (for example, Received Signal Strength Indicator (RSSI)), channel information (for example, CSI), and the like may be measured.
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- RSSI Received Signal Strength Indicator
- channel information for example, CSI
- the transmission path interface 140 transmits and receives signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, etc., and user data (user plane data) for the user terminal 20, control plane data, and the like. Data and the like may be obtained, transmitted, and the like.
- the transmitter and receiver of the base station 10 in the present disclosure may be configured by at least one of the transmitter/receiver 120, the transmitter/receiver antenna 130, and the transmission line interface 140.
- the transmitting/receiving unit 120 may transmit a reference signal associated with a second physical cell ID (PCI) different from the first physical cell ID (PCI) corresponding to the serving cell.
- PCI physical cell ID
- the control unit 110 may control at least one of radio link monitoring (RLM), beam failure detection (BFD), and beam failure recovery (BFR) using the reference signal.
- RLM radio link monitoring
- BFD beam failure detection
- BFR beam failure recovery
- FIG. 5 is a diagram illustrating an example of the configuration of a user terminal according to one embodiment.
- the user terminal 20 includes a control section 210 , a transmission/reception section 220 and a transmission/reception antenna 230 .
- One or more of each of the control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may be provided.
- this example mainly shows the functional blocks of the features of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.
- the control unit 210 controls the user terminal 20 as a whole.
- the control unit 210 can be configured from a controller, a control circuit, and the like, which are explained based on common recognition in the technical field according to the present disclosure.
- the control unit 210 may control signal generation, mapping, and the like.
- the control unit 210 may control transmission/reception, measurement, etc. using the transmission/reception unit 220 and the transmission/reception antenna 230 .
- the control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission/reception unit 220 .
- the transmitting/receiving section 220 may include a baseband section 221 , an RF section 222 and a measurement section 223 .
- the baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212 .
- the transmitting/receiving unit 220 can be configured from a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, etc., which are explained based on common recognition in the technical field according to the present disclosure.
- the transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured from a transmission unit and a reception unit.
- the transmission section may be composed of a transmission processing section 2211 and an RF section 222 .
- the receiving section may include a reception processing section 2212 , an RF section 222 and a measurement section 223 .
- the transmitting/receiving antenna 230 can be configured from an antenna described based on common recognition in the technical field related to the present disclosure, such as an array antenna.
- the transmitting/receiving unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmitting/receiving unit 220 may transmit the above-described uplink channel, uplink reference signal, and the like.
- the transmitter/receiver 220 may form at least one of the transmission beam and the reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.
- digital beamforming eg, precoding
- analog beamforming eg, phase rotation
- the transmission/reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- RLC layer processing for example, RLC retransmission control
- MAC layer processing for example, for data and control information acquired from the control unit 210, for example , HARQ retransmission control
- the transmitting/receiving unit 220 (transmission processing unit 2211) performs channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), and IFFT processing on a bit string to be transmitted. , precoding, digital-analog conversion, and other transmission processing may be performed, and the baseband signal may be output.
- Whether or not to apply DFT processing may be based on transform precoding settings. Transmitting/receiving unit 220 (transmission processing unit 2211), for a certain channel (for example, PUSCH), if transform precoding is enabled, the above to transmit the channel using the DFT-s-OFDM waveform
- the DFT process may be performed as the transmission process, or otherwise the DFT process may not be performed as the transmission process.
- the transmitting/receiving unit 220 may perform modulation to a radio frequency band, filter processing, amplification, and the like on the baseband signal, and may transmit the radio frequency band signal via the transmitting/receiving antenna 230. .
- the transmitting/receiving section 220 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting/receiving antenna 230.
- the transmission/reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (error correction) on the acquired baseband signal. decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmitting/receiving section 220 may measure the received signal.
- the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal.
- the measuring unit 223 may measure received power (eg, RSRP), received quality (eg, RSRQ, SINR, SNR), signal strength (eg, RSSI), channel information (eg, CSI), and the like.
- the measurement result may be output to control section 210 .
- the transmitter and receiver of the user terminal 20 in the present disclosure may be configured by at least one of the transmitter/receiver 220 and the transmitter/receiver antenna 230 .
- the transmitting/receiving unit 220 may receive a reference signal associated with a second physical cell ID (PCI) different from the first physical cell ID (PCI) corresponding to the serving cell.
- PCI physical cell ID
- the control unit 210 may control at least one of radio link monitoring (RLM), beam failure detection (BFD), and beam failure recovery (BFR) using the reference signal.
- RLM radio link monitoring
- BFD beam failure detection
- BFR beam failure recovery
- Control unit 210 determines if the reference signal of the cell associated with the second PCI is configured for beam measurement or if the TCI state associated with the second PCI is activated. , the reference signal may be used to control at least one of the RLM, the BFD and the BFR.
- the control unit 210 may control at least one of the RLM, the BFD, and the BFR using the reference signal when corresponding settings are made by higher layer signaling.
- the transmitting/receiving unit 220 may receive a random access channel (PRACH) transmission setting corresponding to the cell having the second PCI.
- the control unit 210 may control the BFR based on the settings.
- PRACH random access channel
- each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.
- a functional block may be implemented by combining software in the one device or the plurality of devices.
- function includes judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deem , broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (component) that performs transmission may be called a transmitting unit, a transmitter, or the like. In either case, as described above, the implementation method is not particularly limited.
- a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 6 is a diagram illustrating an example of hardware configurations of a base station and a user terminal according to one embodiment.
- the base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. .
- the hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.
- processor 1001 may be implemented by one or more chips.
- predetermined software program
- the processor 1001 performs calculations, communication via the communication device 1004 and at least one of reading and writing data in the memory 1002 and the storage 1003 .
- the processor 1001 operates an operating system and controls the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like.
- CPU central processing unit
- control unit 110 210
- transmission/reception unit 120 220
- FIG. 10 FIG. 10
- the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them.
- programs program codes
- software modules software modules
- data etc.
- the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be similarly implemented.
- the memory 1002 is a computer-readable recording medium, such as Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or at least any other suitable storage medium. may be configured by one.
- the memory 1002 may also be called a register, cache, main memory (main storage device), or the like.
- the memory 1002 can store executable programs (program code), software modules, etc. for implementing a wireless communication method according to an embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also be called an auxiliary storage device.
- a computer-readable recording medium for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, Blu-ray disc), removable disc, hard disk drive, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium may be configured by Storage 1003 may also
- the communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes a high-frequency switch, duplexer, filter, frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD), for example. may be configured to include
- the transmitting/receiving unit 120 (220), the transmitting/receiving antenna 130 (230), and the like described above may be realized by the communication device 1004.
- the transmitter/receiver 120 (220) may be physically or logically separated into a transmitter 120a (220a) and a receiver 120b (220b).
- the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
- Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses between devices.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc. It may be configured including hardware, and a part or all of each functional block may be realized using the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.
- DSP digital signal processor
- ASIC application specific integrated circuit
- PLD programmable logic device
- FPGA field programmable gate array
- a signal may also be a message.
- a reference signal may be abbreviated as RS, and may also be called a pilot, a pilot signal, etc., depending on the applicable standard.
- a component carrier may also be called a cell, a frequency carrier, a carrier frequency, or the like.
- a radio frame may consist of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) that make up a radio frame may be called a subframe.
- a subframe may consist of one or more slots in the time domain.
- a subframe may be a fixed time length (eg, 1 ms) independent of numerology.
- a numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel.
- Numerology for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration , a particular filtering process performed by the transceiver in the frequency domain, a particular windowing process performed by the transceiver in the time domain, and/or the like.
- a slot may consist of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may also be a unit of time based on numerology.
- a slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) transmitted in time units larger than a minislot may be referred to as PDSCH (PUSCH) Mapping Type A.
- PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.
- Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be read interchangeably.
- one subframe may be called a TTI
- a plurality of consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum scheduling time unit in wireless communication.
- a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis.
- radio resources frequency bandwidth, transmission power, etc. that can be used by each user terminal
- a TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, or the like.
- a TTI that is shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
- the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms
- the short TTI e.g., shortened TTI, etc.
- a TTI having the above TTI length may be read instead.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain.
- the number of subcarriers included in the RB may be the same regardless of the neumerology, eg twelve.
- the number of subcarriers included in an RB may be determined based on neumerology.
- an RB may contain one or more symbols in the time domain and may be 1 slot, 1 minislot, 1 subframe or 1 TTI long.
- One TTI, one subframe, etc. may each be configured with one or more resource blocks.
- One or more RBs are Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB Also called a pair.
- PRB Physical Resource Block
- SCG Sub-Carrier Group
- REG Resource Element Group
- PRB pair RB Also called a pair.
- a resource block may be composed of one or more resource elements (Resource Element (RE)).
- RE resource elements
- 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
- a Bandwidth Part (which may also be called a bandwidth part) represents a subset of contiguous common resource blocks (RBs) for a numerology on a carrier.
- the common RB may be identified by an RB index based on the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP for UL
- BWP for DL DL BWP
- One or multiple BWPs may be configured for a UE within one carrier.
- At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP.
- BWP bitmap
- radio frames, subframes, slots, minislots, symbols, etc. described above are merely examples.
- the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers and the number of symbols in a TTI, symbol length, cyclic prefix (CP) length, etc. can be varied.
- the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indicated by a predetermined index.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of
- information, signals, etc. can be output from a higher layer to a lower layer and/or from a lower layer to a higher layer.
- Information, signals, etc. may be input and output through multiple network nodes.
- Input/output information, signals, etc. may be stored in a specific location (for example, memory), or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated or appended. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to other devices.
- Uplink Control Information (UCI) Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may also be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like.
- RRC signaling may also be called an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.
- MAC signaling may be notified using, for example, a MAC Control Element (CE).
- CE MAC Control Element
- notification of predetermined information is not limited to explicit notification, but implicit notification (for example, by not notifying the predetermined information or by providing another information by notice of
- the determination may be made by a value (0 or 1) represented by 1 bit, or by a boolean value represented by true or false. , may be performed by numerical comparison (eg, comparison with a predetermined value).
- Software whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) , a server, or other remote source, these wired and/or wireless technologies are included within the definition of transmission media.
- a “network” may refer to devices (eg, base stations) included in a network.
- precoding "precoding weight”
- QCL Quality of Co-Location
- TCI state Transmission Configuration Indication state
- spatialal patial relation
- spatialal domain filter "transmission power”
- phase rotation "antenna port
- antenna port group "layer”
- number of layers Terms such as “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, “antenna”, “antenna element”, “panel” are interchangeable. can be used as intended.
- base station BS
- radio base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission Point (TP)”, “Reception Point (RP)”, “Transmission/Reception Point (TRP)”, “Panel”
- a base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.
- a base station can accommodate one or more (eg, three) cells.
- the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is assigned to a base station subsystem (e.g., a small indoor base station (Remote Radio)). Head (RRH))) may also provide communication services.
- a base station subsystem e.g., a small indoor base station (Remote Radio)). Head (RRH)
- RRH Head
- the terms "cell” or “sector” refer to part or all of the coverage area of at least one of the base stations and base station subsystems that serve communication within such coverage.
- MS Mobile Station
- UE User Equipment
- Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , a handset, a user agent, a mobile client, a client, or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like.
- the mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ).
- at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.
- at least one of the base station and mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read as a user terminal.
- communication between a base station and a user terminal is replaced with communication between multiple user terminals (for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.)
- the user terminal 20 may have the functions of the base station 10 described above.
- words such as "uplink” and “downlink” may be replaced with words corresponding to communication between terminals (for example, "sidelink”).
- uplink channels, downlink channels, etc. may be read as sidelink channels.
- user terminals in the present disclosure may be read as base stations.
- the base station 10 may have the functions of the user terminal 20 described above.
- operations that are assumed to be performed by the base station may be performed by its upper node in some cases.
- various operations performed for communication with a terminal may involve the base station, one or more network nodes other than the base station (e.g., Clearly, this can be done by a Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. (but not limited to these) or a combination thereof.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching along with execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG xG (xG (x is, for example, an integer or a decimal number)
- Future Radio Access FAA
- RAT New - Radio Access Technology
- NR New Radio
- NX New radio access
- FX Future generation radio access
- GSM registered trademark
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi®
- IEEE 802.16 WiMAX®
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth®, or other suitable wireless It may be applied to systems using communication methods, next-generation systems extended based on these, and the like. Also, multiple systems may be applied to systems using communication methods, next-generation systems extended based on these, and the like
- any reference to elements using the "first,” “second,” etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.
- determining includes judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry ( For example, looking up in a table, database, or another data structure), ascertaining, etc. may be considered to be “determining.”
- determining (deciding) includes receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access ( accessing (e.g., accessing data in memory), etc.
- determining is considered to be “determining” resolving, selecting, choosing, establishing, comparing, etc. good too. That is, “determining (determining)” may be regarded as “determining (determining)” some action.
- connection refers to any connection or coupling, direct or indirect, between two or more elements. and can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other. Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection” may be read as "access”.
- radio frequency domain when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, radio frequency domain, microwave They can be considered to be “connected” or “coupled” together using the domain, electromagnetic energy having wavelengths in the optical (both visible and invisible) domain, and the like.
- a and B are different may mean “A and B are different from each other.”
- the term may also mean that "A and B are different from C”.
- Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”
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Abstract
Description
NRでは、送信設定指示状態(Transmission Configuration Indication state(TCI状態))に基づいて、信号及びチャネルの少なくとも一方(信号/チャネルと表現する)のUEにおける受信処理(例えば、受信、デマッピング、復調、復号の少なくとも1つ)、送信処理(例えば、送信、マッピング、プリコーディング、変調、符号化の少なくとも1つ)を制御することが検討されている。
・QCLタイプA(QCL-A):ドップラーシフト、ドップラースプレッド、平均遅延及び遅延スプレッド、
・QCLタイプB(QCL-B):ドップラーシフト及びドップラースプレッド、
・QCLタイプC(QCL-C):ドップラーシフト及び平均遅延、
・QCLタイプD(QCL-D):空間受信パラメータ。
NRでは、1つ又は複数の送受信ポイント(Transmission/Reception Point(TRP))(マルチTRP(multi TRP(MTRP)))が、1つ又は複数のパネル(マルチパネル)を用いて、UEに対してDL送信を行うことが検討されている。また、UEが、1つ又は複数のTRPに対して、1つ又は複数のパネルを用いて、UL送信を行うことが検討されている。
[条件1]
1のCORESETプールインデックスが設定される。
[条件2]
CORESETプールインデックスの2つの異なる値(例えば、0及び1)が設定される。
[条件]
DCI内のTCIフィールドの1つのコードポイントに対する1つ又は2つのTCI状態を指示するために、「UE固有PDSCH用拡張TCI状態アクティベーション/ディアクティベーションMAC CE(Enhanced TCI States Activation/Deactivation for UE-specific PDSCH MAC CE)」が用いられる。
(1)UEは、サービングセルから、当該サービングセルとは異なるPCIを有するTRPのビーム測定用のSSBの設定、及び異なるPCIのリソースを含む、データ送受信に無線リソースを使用するために必要な設定を受信する。
(2)UEは、異なるPCIを有するTRPのビーム測定を実行し、ビーム測定結果をサービングセルに報告する。
(3)上記の報告に基づいて、異なるPCIを有するTRPに関連付けられたTCI状態が、サービングセルからのL1/L2シグナリングによって、アクティブ化される。
(4)UEは、異なるPCIを有するTRP上のUE個別(dedicated)チャネルを使用して送受信する。
(5)UEは、マルチTRPの場合も含めて、常にサービングセルをカバーしている必要がある。UEは、従来システムと同様に、サービングセルからの共通チャネル(ブロードキャスト制御チャネル(BCCH:Broadcast Control Channel)、ページングチャネル(PCH:Paging Channel))などを使用する必要がある。
シナリオ2では、L1/L2セル間モビリティを適用する。L1/L2セル間モビリティでは、RRC再設定せずに、ビーム制御などの機能を用いてサービングセル変更が可能である。言い換えると、ハンドオーバーせずに、非サービングセルとの送受信が可能である。ハンドオーバーのためにはRRC再接続が必要になるなど、データ通信不可期間が生じるので、ハンドオーバー不要なL1/L2セル間モビリティを適用することにより、サービングセル変更の際にもデータ通信を継続することができる。シナリオ2は、例えば、Rel.18において適用されてもよい。シナリオ2では、例えば、以下の手順が行われる。
(2)UEは、異なるPCIを使用したセルのビーム測定を実行し、測定結果をサービングセルに報告する。
(3)UEは、異なるPCIを持つセルの設定(サービングセル設定)を、上位レイヤシグナリング(例えばRRC)によって受信してもよい。つまり、サービングセル変更に関する事前設定が行われてもよい。この設定は、(1)における設定とともに行われてもよいし、別々に行われてもよい。
(4)上記の報告に基づいて、異なるPCIを持つセルのTCI状態は、サービングセルの変更に従ってL1/L2シグナリングによってアクティブ化されてもよい。TCI状態のアクティブ化及びサービングセルの変更は、別々に行われてもよい。
(5)UEは、サービングセルを変更し、予め設定されたUE個別のチャネルとTCI状態を使用して受信/送信を開始する。
ところで、NRにおいても、無線リンクモニタリング(Radio Link Monitoring(RLM))が利用される。RLMに用いるRSをRLM-RSと称する。RLMにおいて、UEは、上位レイヤシグナリングなどにより、明示的RLM-RS(例えば、SSB/CSI-RS)の設定が行われてもよい。又は、UEは、RLMにおいて、PDCCH/CORESETのTCI状態に基づく暗示的RLM-RSの設定が行われてもよい(UEが当該TCI状態に基づいてRLM-RSを決定してもよい)。以下、明示的RLM-RS、暗示的RLM-RSなどについて具体的に説明する。
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。
BFDにおいて、UEは、上位レイヤシグナリングなどにより、明示的BFD-RS(例えば、SSB/CSI-RS)の設定が行われてもよい。又は、UEは、BFDにおいて、PDCCH/CORESETのTCI状態に基づく暗示的BFD-RSの設定が行われてもよい(UEが当該TCI状態に基づいてBFD-RSを決定してもよい)。また、BFRにおいて、UEは、上位レイヤシグナリングなどにより、明示的NBI-RS(例えば、SSB/CSI-RS)の設定が行われてもよい。以下、明示的BFD-RS、暗示的BFD-RS、明示的NBI-RSなどについて具体的に説明する。
3GPP Rel.17において、Component Carrier(CC)上のTRP固有のリンクリカバリ(BFD/BFR)が行われてもよい。Rel.17は、他のリリース番号(例えばRel.18以降の番号)に読み替えられてもよい。UEは、上位レイヤシグナリングなどにより、シングルDCI/マルチDCIベースのマルチTRPのための2セットの明示的BFD-RS(例えば、SSB/CSI-RS)設定が行われてもよい。又は、UEは、BFDにおいて、PDCCH/CORESETのTCI状態に基づく、シングルDCI/マルチDCIベースのマルチTRPのための暗示的BFD-RSの設定が行われてもよい(UEが当該TCI状態に基づいてシングルDCI/マルチDCIベースのマルチTRPのためのBFD-RSを決定してもよい)。UEは、上位レイヤシグナリングなどにより、シングルDCI/マルチDCIベースのマルチTRPのための2セットの明示的NBI-RS(例えば、SSB/CSI-RS)設定が行われてもよい。
しかしながら、複数のセルを利用する場合における、RLM、BFD、NBIの少なくとも1つに用いるRSの決定について、明確となっていない。例えば、UEが、異なるPCIに関連づけられたRLM-RS/BFD-RS/NBI-RSをサポートするか(利用するか)どうかが明確となっていない。
<第1の実施形態>
UEは、異なるPCIを持つセルのRS(異なるPCIに関連付けられたRS)がビーム測定用に設定されている場合、又は異なるPCIに関連付けられているTCI状態(例えばPDCCHのTCI状態)がアクティブ化されている場合、無線リンクモニタリング参照信号(RLM-RS)の設定/決定は、以下のいずれかのオプションに従ってもよい。
UEは、RLM-RSとして、RS(例えばSSB)又はPDCCHのTCI状態が異なるPCIを有するかを考慮(想定)せずに、所定のルール(例えば、上記(RLM)に記載した手順)に従ってもよい。UEは、RLM-RSとして、異なるPCIに関連づけられたRS(例えばSSB)又は異なるPCIに関連づけられたPDCCHのTCI状態を考慮(想定)して、所定のルール(例えば、上記(RLM)に記載した手順)に従ってもよい。この場合、RLM-RSセットは、サービングセルのPCIからのRS(サービングセルのPCIを有するRS)に加えて、異なるPCIに関連づけられたRSを含んでもよい。
RLM-RSセット内の異なるPCIに関連づけられた1以上のRSは、同じ1つのPCIに関連付けられてもよい。これは、最大で1つの異なるPCIセルに関連づけられた1以上のRSを、RLM-RSに含めることができることを意味する。
RLM-RSセット内の異なるPCIに関連づけられた1以上のRSは、複数の異なるPCIに関連付けられてもよい。
UEは、RLM-RSとして、異なるPCIに関連づけられたRS(例えばSSB)又はPDCCHのTCI状態を考慮(想定)しなくてもよい。UEは、RLM-RSに対応する、RS又はPDCCHのTCI状態を、サービングセルのPCIのみから考慮(想定)してもよい。言い換えると、UEは、サービングセルのPCIのみに関連付けられたRS、又は、サービングセルのPCIのみに関連付けられたTCI状態内のRSから、RLM-RSを決定してもよい。オプション1-2は、セル固有のBFRに適用されてもよい。
UEは、異なるPCIに関連付けられたPDCCHのRS(例えばSSB)又は異なるPCIに関連付けられたTCI状態を考慮しなくてもよい。UEは、非サービングセルのPCIのみに関連付けられたRS又は非サービングセルのPCIのみに関連付けられたPDCCHのTCI状態内のRSを、RLM-RSとして考慮/決定してもよい。つまり、UEは、非サービングセルのPCIに関連づけられたRSを受信し、そのRSを用いてRLMを制御してもよい。これにより、非サービングセルのPCIを用いてRLMを適切に制御できる。
UEは、異なるPCIを持つセルのRS(異なるPCIに関連付けられたRS)が、ビーム測定用に設定される場合、又は、異なるPCIに関連付けられたTCI状態がアクティブ化される場合、2セットのBFD-RSの設定/決定は、以下のいずれかのオプションに従ってもよい。本実施形態のBFD-RS、NBI-RSは互いに読み替えられてもよく、BFD、BFRは互いに読み替えられてもよい。
UEは、2セットのBFD-RSとして、異なるPCIに関連づけられた、RS又はPDCCHのTCI状態を考慮(想定)してもよい。つまり、UEは、2セットのBFD-RSとして、異なるPCIに関連づけられたRS、又は、異なるPCIに関連づけられたPDCCHのTCI状態に含まれるRSを受信してもよい。UEは、上述の<Rel.17におけるBFD/BFR>における処理を行ってもよい。
UEは、2セットのBFD-RSとして、異なるPCIに関連づけられたRS又は異なるPCIに関連づけられたPDCCHのTCI状態を考慮(想定)しなくてもよい。つまり、2セットのBFD-RSは、異なるPCIに関連づけられたRSでなく、さらに、異なるPCIに関連づけられたPDCCHのTCI状態に含まれるRSではなくてもよい。UEは、2セットのBFD-RSとして、サービングセルPCIに関連づけられたRS又はPDCCHのTCI状態を考慮してもよい。つまり、2セットのBFD-RSは、サービングセルPCIに関連づけられたRS、又は、サービングセルPCIに関連づけられたPDCCHのTCI状態に含まれるRSであってもよい。
UEは、異なるPCIに関連付けられたPDCCHのRS(例えばSSB)又は異なるPCIに関連付けられたTCI状態を考慮しなくてもよい。UEは、非サービングセルのPCIのみに関連付けられたRS又は非サービングセルのPCIのみに関連付けられたPDCCHのTCI状態内のRSを、BFD-RS/NBI-RSとして考慮/決定してもよい。つまり、UEは、非サービングセルのPCIに関連づけられたRSを受信し、そのRSを用いてBFD/BFRを制御してもよい。これにより、非サービングセルのPCIを用いてBFD/BFRを適切に制御できる。
UEは、Pcell/PSCellのCFRA-BFRのためのPRACH送信用設定(PRACH-ResourceDedicatedBFR)が設定される場合(PRACH送信用設定を受信する場合)、以下のオプション3-1又はオプション3-2が適用されてもよい。PRACH送信用設定、PRACH設定は、互いに読み替えられてもよい。
サービングセルのPCIのみにPRACH送信用設定が設定されてもよい。また、PRACH送信用設定は、異なるPCIを持つセルに関連付けられたPRACH設定は含まれていなくてもよい。UEは、異なるPCIを有するセルに対するCFRAベースのBFRを実行することは期待されていなくてもよい(実行しなくてもよい)。PRACH送信用設定は、非サービングセルの情報を含まなくてもよい。
NBI-RSの設定に、異なるPCIを持つセルからのRSが含まれている場合、PRACH送信用設定は、異なるPCIを持つセルに関連付けられたPRACH設定をサポートしてもよい。つまり、UEは、異なるPCIを持つセルに対応(関連)するPRACH送信用設定を受信し、当該設定に基づいてBFRを制御してもよい。全てのPRACHリソースは、同じ1つのPCI(サービングセルのPCI又は非サービングセルのPCI)に関連付けられてもよい。各PRACHリソースは異なるPCI(例えば、サービングセルのPCI、及び非サービングセルのPCI)に関連付けられてもよい。PRACH設定内の非サービングセルPCIは、NBI-RS設定内の非サービングセルPCIと整合していてもよい。PRACH送信用設定は、非サービングセルの情報を含まなくてもよい。
UEは、本開示における各処理の少なくとも1つをサポートするかを示すUE能力(capability)情報をネットワーク(基地局)に送信(報告)してもよく、UE能力を送信した場合のみ、対応する処理を実行してもよい。また、UEは、本開示における各処理の少なくとも1つを指示/設定する情報をDCI/MAC CE/上位レイヤシグナリング(例えば、RRC)等により受信してもよい。当該情報は、UEが送信したUE能力情報に対応していてもよい。UE能力情報は、例えば、以下の少なくとも1つであってもよい。
以下、本開示の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本開示の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図4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5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)
- サービングセルに対応する第1の物理セルID(PCI)とは異なる第2の物理セルID(PCI)に関連づけられた参照信号を受信する受信部と、
前記参照信号を用いて、無線リンクモニタリング(RLM)、ビーム障害検出(BFD)、ビーム障害回復(BFR)の少なくとも1つを制御する制御部と、
を有する端末。 - 前記制御部は、前記第2のPCIに関連づけられた前記参照信号がビーム測定用に設定されている場合、又は、前記第2のPCIに関連付けられている送信設定指示状態(Transmission Configuration Indication state(TCI状態))がアクティブ化されている場合、前記参照信号を用いて、前記RLM、前記BFD、前記BFRの少なくとも1つを制御する
請求項1に記載の端末。 - 前記制御部は、上位レイヤシグナリングにより対応する設定が行われている場合に、前記参照信号を用いて、前記RLM、前記BFD、前記BFRの少なくとも1つを制御する
請求項1又は2に記載の端末。 - 前記受信部は、前記第2のPCIを持つセルに対応する物理ランダムアクセスチャネル(PRACH)送信用設定を受信し、
前記制御部は、当該設定に基づいて前記BFRを制御する
請求項1から3のいずれかに記載の端末。 - サービングセルに対応する第1の物理セルID(PCI)とは異なる第2の物理セルID(PCI)に関連づけられた参照信号を受信する工程と、
前記参照信号を用いて、無線リンクモニタリング(RLM)、ビーム障害検出(BFD)、ビーム障害回復(BFR)の少なくとも1つを制御する工程と、
を有する端末の無線通信方法。 - サービングセルに対応する第1の物理セルID(PCI)とは異なる第2の物理セルID(PCI)に関連づけられた参照信号を送信する送信部と、
前記参照信号を用いて、無線リンクモニタリング(RLM)、ビーム障害検出(BFD)、ビーム障害回復(BFR)の少なくとも1つを制御する制御部と、
を有する基地局。
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