WO2024225239A1 - 端末、無線通信方法及び基地局 - Google Patents
端末、無線通信方法及び基地局 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
- H04W36/085—Reselecting an access point involving beams of access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/19—Connection re-establishment
Definitions
- This disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems.
- LTE Long Term Evolution
- UMTS Universal Mobile Telecommunications System
- Non-Patent Document 1 LTE-Advanced (3GPP Rel. 10-14) was specified for the purpose of achieving higher capacity and greater sophistication over LTE (Third Generation Partnership Project (3GPP (registered trademark)) Release (Rel.) 8, 9).
- LTE 5th generation mobile communication system
- 5G+ 5th generation mobile communication system
- 6G 6th generation mobile communication system
- NR New Radio
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- communications will be controlled using multiple transmission/reception points (e.g., Multi-TRP (MTRP)) in a serving cell, or communications will be controlled based on inter-cell mobility/inter-cell mobility including non-serving cells.
- MTRP Multi-TRP
- the question is whether or not the settings need to be set for each candidate cell. For example, when a cell switching command triggers an SpCell switch or a cell group switch, it is not clear whether and how to apply the above-mentioned settings. If these are not clear, the UE operation corresponding to the cell switch cannot be appropriately controlled, which may result in a deterioration in communication quality.
- This disclosure has been made in consideration of these points, and one of its objectives is to provide a terminal, a wireless communication method, and a base station that are capable of performing appropriate communication even when cell switching is performed.
- a terminal has a receiving unit that receives a medium access control control element (MAC CE) related to cell switching, and a control unit that controls the application of at least one setting of radio link monitoring (RLM), beam failure detection (BFD), and uplink control channel (PUCCH) for a specific cell based on information included in the MAC CE.
- MAC CE medium access control control element
- RLM radio link monitoring
- BFD beam failure detection
- PUCCH uplink control channel
- communication can be performed appropriately even when cell switching is performed.
- FIGS. 1A to 1D are diagrams showing an example of a multi-TRP.
- 2A and 2B are diagrams illustrating an example of inter-cell mobility.
- 3A and 3B are diagrams illustrating an example of switching between a serving cell and an additional cell via L1/L2 signaling.
- FIG. 4 is a diagram showing an example of configuration example 1-3 when a candidate cell is supported.
- 5A to 5C are diagrams showing an example of switching between candidate cells/candidate cell groups by L1/L2 signaling in configuration examples 1-3 when candidate cells are supported.
- Figure 6 shows an overview of L1L2-triggered mobility (LTM).
- FIG. 7 illustrates a PDCCH ordered RACH with random access response (RAR) monitoring for a serving cell.
- FIG. 8 illustrates a PDCCH ordered RACH without random access response (RAR) monitoring for a candidate cell.
- Figure 9 shows some of the higher layer parameters (e.g., IE RadioLinkMonitoringConfig) used by a UE to configure Radio Link Monitoring (RLM).
- FIG. 10 is a diagram showing an example of an existing beam recovery procedure.
- Figure 11 shows some of the higher layer parameters (e.g., IE BeamFailureRecoveryConfig) used by the UE to configure Beam Failure Recovery (BFR).
- FIG. 12 shows a part of the PUCCH configuration (e.g., IE PUCCH-Config) included in the UE-specific UL BWP configuration (upper layer parameters (BWP-UplinkDedicated)).
- FIG. 13 is a diagram illustrating an example of a UE operation according to the first embodiment.
- FIG. 14 is a diagram illustrating an example of a UE operation according to the second embodiment.
- FIG. 15 is a diagram illustrating an example of a UE operation according to the third embodiment.
- FIG. 16 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 17 is a diagram illustrating an example of the configuration of a base station according to an embodiment.
- FIG. 18 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment.
- FIG. 19 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment.
- FIG. 20 is a diagram illustrating an example of a vehicle according to an embodiment.
- TCI transmission configuration indication state
- the TCI state may represent that which applies to the downlink signal/channel.
- the equivalent of the TCI state which applies to the uplink signal/channel may be expressed as a spatial relation.
- TCI state is information about the Quasi-Co-Location (QCL) of signals/channels and may also be called spatial reception parameters, spatial relation information, etc. TCI state may be set in the UE on a per channel or per signal basis.
- QCL Quasi-Co-Location
- QCL is an index that indicates the statistical properties of a signal/channel. For example, if a signal/channel has a QCL relationship with another signal/channel, it may mean that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameters (e.g., spatial Rx parameters) is identical between these different signals/channels (i.e., it is QCL with respect to at least one of these).
- spatial parameters e.g., spatial Rx parameters
- the spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be identified based on a spatial QCL.
- the QCL (or at least one element of the QCL) in this disclosure may be interpreted as sQCL (spatial QCL).
- QCL types QCL types
- QCL types A to D QCL types A to D
- the parameters (which may be called QCL parameters) are as follows: 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.
- QCL Type A QCL-A
- QCL-B Doppler shift and Doppler spread
- QCL type C QCL type C
- QCL Type D QCL Type D
- the UE's assumption that a Control Resource Set (CORESET), channel or reference signal is in a particular QCL (e.g., QCL type D) relationship with another CORESET, channel or reference signal may be referred to as a QCL assumption.
- CORESET Control Resource Set
- QCL QCL type D
- the 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 condition or QCL assumption of the signal/channel.
- Tx beam transmit beam
- Rx beam receive beam
- the TCI state may be, for example, information regarding the QCL between the target channel (in other words, the Reference Signal (RS) for that channel) and another signal (e.g., another RS).
- the TCI state may be set (indicated) by higher layer signaling, physical layer signaling, or a combination of these.
- target channel/RS target channel/reference signal
- reference RS reference signal
- the channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of the following: a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Downlink Control Channel
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a tracking CSI-RS (also called a tracking reference signal (TRS)), a QCL detection reference signal (also called a QRS), a demodulation reference signal (DMRS), etc.
- SSB synchronization signal block
- CSI-RS channel state information reference signal
- SRS sounding reference signal
- TRS tracking reference signal
- QRS QCL detection reference signal
- DMRS demodulation 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 referred to as an SS/PBCH block.
- An RS of QCL type X in a TCI state may refer to an RS that has a QCL type X relationship with a certain channel/signal (DMRS), and this RS may be called a QCL source of QCL type X in that TCI state.
- DMRS channel/signal
- Multi-TRP In NR, one or more transmission/reception points (TRPs) (multi-TRPs) are considered to perform DL transmission to a UE using one or more panels (multi-panels). It is also considered that a UE performs UL transmission to one or more TRPs.
- TRPs transmission/reception points
- multiple TRPs may correspond to the same cell identifier (cell identifier (ID)) or different cell IDs.
- the cell ID may be a physical cell ID (e.g., PCI) or a virtual cell ID.
- FIGS 1A-1D are diagrams illustrating an example of a multi-TRP scenario. In these examples, it is assumed that each TRP is capable of transmitting four different beams, but is not limited to this.
- FIG. 1A shows an example of a case where only one TRP (TRP1 in this example) of the multi-TRP transmits to the UE (which may be called single mode, single TRP, etc.).
- TRP1 transmits both a control signal (PDCCH) and a data signal (PDSCH) to the UE.
- PDCCH control signal
- PDSCH data signal
- single TRP mode may refer to the mode when multi-TRP (mode) is not set.
- FIG. 1B shows an example of a case where only one TRP (TRP1 in this example) of the multi-TRP transmits a control signal to the UE, and the multi-TRP transmits a data signal (which may be called a single master mode).
- the UE receives each PDSCH transmitted from the multi-TRP based on one downlink control information (Downlink Control Information (DCI)).
- DCI Downlink Control Information
- FIG. 1C shows an example of a case where each of the multi-TRPs transmits a part of a control signal to the UE and the multi-TRP transmits a data signal (which may be called a master-slave mode).
- Part 1 of the control signal (DCI) may be transmitted in TRP1
- part 2 of the control signal (DCI) may be transmitted in TRP2.
- Part 2 of the control signal may depend on part 1.
- the UE receives each PDSCH transmitted from the multi-TRP based on these parts of DCI.
- FIG. 1D shows an example of a case where each of the multi-TRPs transmits a separate control signal to the UE, and the multi-TRP transmits a data signal (which may be called a multi-master mode).
- a first control signal (DCI) may be transmitted from TRP1
- a second control signal (DCI) may be transmitted from TRP2.
- the UE receives each PDSCH transmitted from the multi-TRP based on these DCIs.
- the DCI may be called a single DCI (S-DCI, single PDCCH). Also, when multiple PDSCHs from a multi-TRP such as that shown in FIG. 1D are scheduled using multiple DCIs, these multiple DCIs may be called multiple DCIs (M-DCI, multiple PDCCHs).
- Each TRP in a multi-TRP may transmit a different Transport Block (TB)/Code Word (CW)/different layer.
- TB Transport Block
- CW Code Word
- each TRP in a multi-TRP may transmit the same TB/CW/layer.
- Non-Coherent Joint Transmission is being considered as one form of multi-TRP transmission.
- TRP1 modulates and maps a first codeword, and transmits a first PDSCH using a first number of layers (e.g., two layers) and a first precoding by layer mapping.
- TRP2 modulates and maps a second codeword, and transmits a second PDSCH using a second number of layers (e.g., two layers) and a second precoding by layer mapping.
- multiple PDSCHs (multi-PDSCHs) that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains.
- the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap with each other in at least one of the time and frequency resources.
- the first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (QCL). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).
- QCL type D e.g., QCL type D
- PDSCH transport block (TB) or codeword (CW) repetition across multi-TRP is supported. It is considered that repetition methods (URLLC schemes, e.g., schemes 1, 2a, 2b, 3, 4) across multi-TRP in the frequency domain, layer (spatial) domain, or time domain are supported.
- URLLC schemes e.g., schemes 1, 2a, 2b, 3, 4
- multi-PDSCH from multi-TRP is space division multiplexed (SDM).
- SDM space division multiplexed
- FDM frequency division multiplexed
- RV redundancy version
- the RV may be the same or different for multi-TRP.
- multiple PDSCHs from multiple TRPs are time division multiplexed (TDM).
- TDM time division multiplexed
- multiple PDSCHs from multiple TRPs are transmitted in one slot.
- multiple PDSCHs from multiple TRPs are transmitted in different slots.
- Such a multi-TRP scenario allows for more flexible transmission control using channels of better quality.
- NCJT using multiple TRPs/panels may use high rank.
- both single DCI single PDCCH, e.g., FIG. 1B
- multiple DCI multiple PDCCH, e.g., FIG. 1D
- the maximum number of TRPs may be 2.
- TCI extension For single PDCCH design (mainly for ideal backhaul), TCI extension is being considered.
- Each TCI code point in the DCI may correspond to TCI state 1 or 2.
- the TCI field size may be the same as that of Rel. 15.
- one TCI state without CORESETPoolIndex (also called TRP Info) is set for one CORESET.
- a CORESET pool index is set for each CORESET.
- TRPs transmission/reception points
- MTRPs multi-TRPs
- a UE may receive channels/signals from multiple cells/TRPs (see Figures 2A and B).
- FIG. 2A shows an example of inter-cell mobility (e.g., Single-TRP inter-cell mobility) including non-serving cells.
- the UE may be configured with one TRP (or single TRP) in each cell.
- the UE receives channels/signals from the base station/TRP of cell #1, which is the serving cell, and the base station/TRP of cell #3, which is not the serving cell (non-serving cell). For example, this corresponds to a case where the UE switches/changes from cell #1 to cell #3 (e.g., fast cell switch).
- the selection of the port (e.g., antenna port)/TRP may be performed dynamically.
- the selection of the port (e.g., antenna port)/TRP may be performed based on the TCI state indicated or updated by the DCI/MAC CE.
- a case is shown in which different physical cell ID (e.g., PCI) settings are supported for cell #1 and cell #3.
- FIG. 2B shows an example of a multi-TRP scenario (e.g., multi-TRP inter-cell mobility when using multi-TRP).
- the UE may be configured with multiple (e.g., two) TRPs (or different CORESET pool indices) in each cell.
- the UE receives channels/signals from TRP#1 and TRP2.
- the UE receives channels/signals from TRP#1 and TRP#2.
- TRP#1 corresponds to physical cell ID (PCI)#1
- TRP#2 corresponds to PCI#2.
- the multi-TRP (TRP #1, #2) may be connected by an ideal/non-ideal backhaul to exchange information, data, etc.
- Each TRP of the multi-TRP may transmit the same or different code words (CWs) and the same or different layers.
- CWs code words
- NJT non-coherent joint transmission
- Figure 2B the case where NCJT is performed between TPRs corresponding to different PCIs is shown.
- the same serving cell setting may be applied/set for TRP #1 and TRP #2.
- the multiple PDSCHs (multi-PDSCHs) that are 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 TRP#1 and the second PDSCH from TRP#2 may overlap in at least one of the time and frequency resources. The first PDSCH and the second PDSCH may be used to transmit the same TB or different TBs.
- the first PDSCH and the second PDSCH may be assumed to be not quasi-co-located (QCL). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that are not of a certain QCL type (e.g., QCL type D).
- QCL type D e.g., QCL type D
- Multiple PDSCHs from a multi-TRP may be scheduled using one DCI (single DCI (S-DCI), single PDCCH) (single master mode).
- DCI single DCI
- S-DCI single DCI
- PDCCH single PDCCH
- One DCI may be transmitted from one TRP of a multi-TRP.
- a configuration that utilizes one DCI in a multi-TRP may be referred to as single DCI-based multi-TRP (mTRP/MTRP).
- Multiple PDSCHs from a multi-TRP may be scheduled using multiple DCIs (multiple DCI (M-DCI), multiple PDCCHs) respectively (multiple master mode). Multiple DCIs may be transmitted respectively from a multi-TRP.
- M-DCI multiple DCI
- PDCCHs multiple PDCCHs
- Multiple DCIs may be transmitted respectively from a multi-TRP.
- a configuration that utilizes multiple DCIs in a multi-TRP may be called a multi-DCI-based multi-TRP (mTRP/MTRP).
- CSI feedback may be referred to as separate feedback, separate CSI feedback, etc.
- Separatate may be interchangeably read as “independent.”
- the serving cell may be read as the TRP in the serving cell.
- Layer 1/layer 2 (L1/L2) and DCI/Medium Access Control Element (MAC CE) may be read as each other.
- MAC CE DCI/Medium Access Control Element
- a PCI that is different from the physical cell ID (Physical Cell Identity (PCI)) of the current serving cell may be simply referred to as a "different PCI.”
- PCI Physical Cell Identity
- a non-serving cell, a cell having a different PCI, a candidate cell, and an additional cell may be read as each other.
- Scenario 1 corresponds to, for example, multi-TRP inter-cell mobility. Note that scenario 1 may not correspond to multi-TRP inter-cell mobility. In scenario 1, for example, the following procedure is performed.
- the UE receives from the serving cell the configuration necessary to use radio resources for data transmission and reception, including an SSB configuration for beam measurement of a TRP corresponding to a PCI different from that of the serving cell, and resources of the different PCI.
- the UE performs beam measurements of TRPs corresponding to different PCIs and reports the beam measurement results to the serving cell.
- the Transmission Configuration Indication (TCI) states associated with the TRPs corresponding to different PCIs are activated by L1/L2 signaling from the serving cell.
- the UE transmits and receives using UE-dedicated channels on TRPs corresponding to different PCIs.
- the UE must always cover the serving cell, including in the case of multi-TRP.
- the UE must use common channels (Broadcast Control Channel (BCCH), Paging Channel (PCH)) from the serving cell, as in the conventional system.
- BCCH Broadcast Control Channel
- PCH Paging Channel
- scenario 1 when the UE transmits and receives signals to and from an additional cell/TRP (TRP corresponding to the PCI of the additional cell), the serving cell (the serving cell assumed by the UE) is not changed. In other words, serving cell switching by L1/L2 is not supported.
- the UE is configured with higher layer parameters related to the PCI of non-serving cells from the serving cell. Scenario 1 may be applied, for example, in Rel. 17.
- FIG 3A shows an example of UE movement in Rel. 17. Assume that the UE moves from a cell (serving cell) with PCI #1 to a cell (additional cell) with PCI #3 (which overlaps with the serving cell). In this case, Rel. 17 does not support switching of the serving cell by L1/L2.
- An additional cell is a cell that has an additional PCI that is different from the PCI of the serving cell.
- the UE can receive/transmit UE-specific channels from the additional cell.
- the UE needs to be within the coverage of the serving cell to receive UE common channels (e.g., system information/paging/short messages). If the UE moves out of the coverage of the serving cell, a cell switch is required, such as by handover (also called L3 mobility).
- ⁇ Scenario 2> L1/L2 inter-cell mobility is applied.
- the serving cell can be changed using a function such as beam control without RRC reconfiguration.
- transmission and reception with an additional cell is possible without handover (or without performing an L3 mobility procedure). Since a period in which data communication is not possible occurs due to the need for RRC reconnection 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.
- scenario 2 for example, the following procedure is performed.
- the UE receives SSB configuration of a cell (additional cell) with a different PCI from the serving cell for beam measurement/serving cell change.
- the UE performs beam measurements of cells using different PCIs and reports the measurement results to the serving cell.
- the UE may receive a configuration of a cell having a different PCI (serving cell configuration) by higher layer signaling (e.g., RRC). That is, a pre-configuration regarding a serving cell change may be performed. This configuration may be performed together with the configuration in (1) or separately.
- the TCI states of cells with different PCIs may be activated by L1/L2 signaling according to the change of serving cell. The activation of the TCI state and the change of serving cell may be performed separately.
- the UE changes the serving cell (assumed serving cell) and starts receiving/transmitting using the pre-configured UE-specific channel and TCI state.
- scenario 2 the serving cell (the assumed serving cell in the UE) is updated by L1/L2 signaling.
- Scenario 2 may be applied in Rel. 18 and later.
- Figure 3B shows an example of UE movement in Rel. 18.
- the serving cell is switched by L1/L2.
- the UE can receive/transmit UE-dedicated/common channels to/from the new serving cell.
- the UE may move out of the coverage of the previous serving cell.
- candidate cells may be configured in addition to serving cells.
- the candidate cells may be read as target cells, additional cells, and additional PCIs.
- One or more candidate cells (or candidate cell groups) may be associated separately with each serving cell, or one or more candidate cells (or candidate cell groups) may be commonly associated with multiple serving cells.
- the configuration of the candidate cell (or the candidate cell group) may be configured in the same manner as the inter-cell beam management (inter-cell BM) of an existing system (e.g., before Rel. 17) using a predetermined upper layer parameter (e.g., ServingCellConfig).
- the configuration of the candidate cell (or the candidate cell group) may reuse the carrier aggregation configuration framework (e.g., CA configuration framework) or the CHO (Conditional Handover)/CPC (Conditional PSCell Change) configuration framework.
- the candidate cell (or candidate cell group) configured in the higher layer parameters may be instructed to the UE for activation/deactivation by the MAC CE/DCI.
- the configuration of the candidate cell for example, at least one of the following configuration examples 1 to 3 may be applied.
- SpCell#0, SCell#1, and SCell#2 are configured as serving cells, and an example of a candidate cell/candidate cell group configured separately from the serving cells is shown.
- the following configuration examples 1 to 3 are merely examples, and the number of serving cells/number of candidate cells/number of candidate cell groups, the association between the serving cell and the candidate cell, etc. are not limited to these and may be changed as appropriate.
- other configuration examples may be supported/applied in addition to/instead of configuration examples 1 to 3.
- one or more candidate cells are associated/configured with each serving cell (or a frequency region corresponding to each serving cell) (see FIG. 4).
- candidate cells #0-1, #0-2, and #0-3 are associated with SpCell #0 (or a frequency region corresponding to SpCell #0)
- candidate cell #1-1 is associated with SCell #1 (or a frequency region corresponding to SCell #1)
- candidate cells #2-1 and #2-2 are associated with SCell #2 (or a frequency region corresponding to SpCell #2).
- Information regarding the association may be set/instructed to the UE from the base station by RRC/MAC CE/DCI.
- candidate cells are associated/configured with a MAC entity/MCG/SCG (see FIG. 4).
- candidate cells #3-#8 are associated with a MAC entity/MCG/SCG.
- candidate cells are not associated with each serving cell, but are configured with a MAC entity or a cell group (e.g., MCG/SCG).
- Information regarding the candidate cells configured for each cell may be configured/instructed to the UE from the base station by RRC/MAC CE/DCI.
- the candidate cell group has one or more candidate cells.
- a candidate cell group #1 having candidate cells #0-#2 a candidate cell group #2 having candidate cells #0 and #1, and a candidate cell group #3 having candidate cell #0 are configured.
- At least one of information about the configured candidate cell group and information about the candidate cells included in each candidate cell group may be configured/instructed to the UE by the base station via RRC/MAC CE/DCI.
- L1 beam indication e.g., indication by the TCI status field of the DCI
- TCI status of an additional PCI or additional cell
- new L1/L2 signals e.g., DCI/MAC CE
- DCI/MAC CE new L1/L2 signals
- An implicit indication may mean, for example, that a CORESET is updated by the MAC CE to a TCI state associated with an additional PCI.
- An explicit indication may mean that the cell switch is directly indicated by the DCI/MAC CE.
- a specific candidate cell may be designated as a serving cell (or switching with the serving cell may be instructed) via L1/L2 signaling.
- Figure 5A shows a case where candidate cell #0-2 becomes an SpCell of the MCG/SCG (SpCell #0 and candidate cell #0-2 are switched) via L1/L2 signaling. Also, a case where candidate cell #2-1 becomes an SCell of the MCG/SCG (SCell #2 and candidate cell #2-1 are switched) via L1/L2 signaling is shown.
- a specific candidate cell may be designated as a serving cell (or switching to the serving cell may be instructed) via L1/L2 signaling.
- Figure 5B shows a case where candidate cell #4 becomes the SpCell of the MCG/SCG (SpCell #0 and candidate cell #4 are switched) via L1/L2 signaling.
- a specific candidate cell group (or one or more candidate cells included in the specific candidate cell group) may be changed/updated to a serving cell group via L1/L2 signaling.
- FIG. 5C shows a case where candidate cell group #1 (or candidate cells #0-#2 included in candidate cell group #1) becomes a serving cell group (the serving cell group and candidate cell group #1 are switched) via L1/L2 signaling.
- candidate cells included in candidate cell group #1 here, candidate cells #0-#2
- a candidate cell associated with SpCell #0 or a candidate cell set in the same frequency region as SpCell #0 may be set as a new SpCell.
- the candidate cell to become the SpCell may be indicated by L1/L2 signaling.
- FIG. 6 shows an overview of L1L2-triggered mobility (LTM).
- LTM and L1/L2 inter-cell mobility may be interpreted as interchangeable.
- the UE receives candidate cell configurations from the NW.
- the information about the candidate cells may include information about the target serving cell, or information about the target serving cell and information about the current serving cell.
- the UE reconfiguration includes TRRC , Tproccesing1/Tproccesing2 .
- TRRC e.g., max. 10 ms
- Tproccesing1/Tproccesing2 e.g., max. 20 ms for same FR and max. 40 ms for different FR
- This may include L2/3 reconfiguration, RF retuning, baseband retuning, security update if required, etc.
- T search (e.g. 0 ms if cell is known, max 60 ms if cell is unknown) is the time required to search for the target cell.
- T ⁇ is the time for fine tracking and acquisition of all timing information.
- T margin (e.g. max 2 ms) is the time for post processing of SSB and CSI-RS.
- the L1 measurement includes T meas (SMTC period (eg, 20 ms)), which is the measured delay from the appearance of the target to the cell switch command.
- T meas SMTC period (eg, 20 ms)
- T IU e.g., max. 15 ms
- T RAR e.g., max. 4 ms
- T cmd e.g., max. 5 ms
- L1/L2 commands HARQ and paging
- T first-data after T cmd is the time when the UE makes the first DL reception/UL transmission on the indicated beam of the target cell after the RAR.
- FIG. 7 illustrates a PDCCH ordered RACH with random access response (RAR) monitoring for a serving cell.
- RAR random access response
- the source cell and the source cell group may be interchangeable.
- the candidate cell and the candidate cell group may be interchangeable.
- the source cell sends a candidate cell setting to the UE. Then, the source cell sends a RACH instruction (PDCCH order) to the UE using a PDCCH (including, for example, DCI format 1_0). Note that in this instruction, one candidate cell is specified because parallel RAR is complicated. Then, the UE sends a PRACH in the RACH procedure to the candidate cell to acquire the TAG/TA.
- a RACH instruction PDCCH order
- PDCCH including, for example, DCI format 1_0
- the source cell then sends an RAR (TA indication) to the UE.
- RAR TA indication
- the RAR is monitored in the SpCell (only in the Distributed Unit (DU)).
- the UE may then transmit and receive in the current serving cell. TA adjustment is then performed in the source cell.
- the source cell then sends a cell switch command to the UE.
- TA information can be moved from the source cell to the target cell.
- UL synchronization of all candidate cells may not be completed.
- the UE performs the first UL transmission using the initial TA.
- Figure 8 shows a PDCCH ordered RACH without random access response (RAR) monitoring for a candidate cell. Only the differences between Figure 8 and Figure 7 will be described.
- multiple candidate cells may be indicated in the RACH indication by the PDCCH (PDCCH order).
- the UE may transmit a PRACH in the RACH procedure to the candidate cell to obtain multiple TAGs/TAs.
- the source cell then transmits a TA indication in the cell switch command without transmitting an RAR.
- a RACH without RAR may be read as a RACH without RAR monitoring (e.g., RACH without RAR monitoring).
- a RACH may be read as a PRACH transmission triggered by a PDCCH order.
- a RACH procedure/PRACH transmission without RAR monitoring may be read as a RACH procedure/PRACH transmission in which RAR monitoring is not required, or a RACH procedure/PRACH transmission in which RAR monitoring is not required.
- each candidate cell configuration may include at least the upper layer parameters CellGroupConfig and a configuration ID.
- the candidate cell configuration is a delta configuration on top of the reference configuration.
- the UE stores the reference configuration as a separate configuration. That is, the reference configurations may be managed separately. For example, a separate reference configuration may be provided for the delta configuration of the candidate cell.
- the MAC CE containing LTM related information for cell switching may be used as a trigger for LTM cell switching.
- the LTM cell switching may be monitored by a timer.
- the MAC CE for cell switching command may be used to indicate connection to the target cell.
- the target cell may be the current SCell/PCell. That is, the current SCell/PCell (serving cell) may be configured as a candidate cell.
- SSB-based measurements e.g., L1-RSRP measurements
- certain configuration parameters are applied/configured for candidate cells.
- a physical cell ID (PCI) or logical ID may be set.
- the PCI or logical ID may be an ID defined in Inter-Cell Beam Management (ICBM) of Rel. 17.
- ICBM Inter-Cell Beam Management
- the time domain may be, for example, SMTC, or periodicity and SSB position in burst (e.g., periodicity and SSB position in burst).
- a physical cell ID (PCI) or logical ID For inter-frequency measurements (e.g., inter-F measurements), a physical cell ID (PCI) or logical ID, a time domain (e.g., time domain), a frequency domain location (e.g., frequency domain location), and a subcarrier spacing (SCS) may be set.
- the PCI or logical ID may be an ID defined in Inter-Cell Beam Management (ICBM) of Rel. 17.
- the time domain may be, for example, SMTC or periodicity and SSB position in burst.
- the frequency domain location may be center frequency.
- the configuration of each candidate cell may be provided by a predetermined upper layer parameter.
- the predetermined upper layer parameter may be, for example, an upper layer parameter related to the configuration of a cell group (e.g., CellGroupConfig IE).
- Radio Link Monitoring In NR, Radio Link Monitoring (RLM) is utilized.
- the base station may configure a radio link monitoring reference signal (Radio Link Monitoring RS (RLM-RS)) for each BWP to the UE using higher layer signaling.
- RLM Radio Link Monitoring RS
- the UE may receive configuration information for RLM (e.g., the RRC "RadioLinkMonitoringConfig" information element) (see Figure 9).
- the configuration information for the RLM may include fault detection resource configuration information (e.g., the upper layer parameter "failureDetectionResourcesToAddModList”).
- the fault detection resource configuration information may include parameters related to the RLM-RS (e.g., the upper layer parameter "RadioLinkMonitoringRS").
- the parameters related to the RLM-RS may include information indicating that it corresponds to the purpose of the RLM, an index corresponding to the resource of the RLM-RS (e.g., an index included in the upper layer parameter "failureDetectionResources" (RadioLinkMonitoringRS in failureDetectionResourcesToAddModList)), etc.
- the index may be, for example, an index of the CSI-RS resource configuration (e.g., a non-zero power CSI-RS resource ID) or an SS/PBCH block index (SSB index).
- the purpose information may indicate a beam failure, a (cell-level) Radio Link Failure (RLF), or both.
- the purpose may mean, for example, determining whether the UE should monitor a reference signal associated with beam failure detection for a cell.
- the network may set a value (parameter) only for beam failure.
- the higher layer signaling for configuring the RLM-RS may include, in addition to configuring the RLM-RS, the configuration of the BFD-RS described below. Also, as described below, the RLM-RS and the BFD-RS may be interpreted as interchangeable.
- the UE may identify an RLM-RS resource based on an index corresponding to the RLM-RS resource, and perform RLM using the RLM-RS resource.
- the UE shall follow steps 1 to 4 below.
- RLM-RS e.g., the higher layer parameter RadioLinkMonitoringRS
- the UE uses the RS provided for the active TCI state for PDCCH reception for RLM.
- the active TCI state for PDCCH reception includes two RSs, the UE assumes that one RS has QCL type D, and the UE uses that RS with QCL type D for RLM. The UE does not assume that both RSs have QCL type D.
- the UE is not required to use aperiodic or semi-persistent RS for RLM.
- the UE selects N RLM RSs provided for active TCI state for PDCCH reception in multiple CORESETs associated with multiple search space sets in order from smallest monitoring periodicity. If more than one CORESET is associated with multiple search space sets with the same monitoring periodicity, the UE determines the order of CORESETs from highest CORESET index.
- Lmax is the maximum number of SS/PBCH block indexes in a cell.
- the maximum number of SS/PBCH blocks transmitted in a half-frame is Lmax .
- the UE can configure up to N LR-RLM RLM-RSs for the link recovery procedure and RLM.
- N LR-RLM RLM-RSs up to N RLM RLM-RSs are used for RLM depending on L max .
- L max 4
- N RLM 2
- L max 8
- a UE and a base station determine the beam used to transmit a signal (also called a transmission beam, Tx beam, etc.) and the beam used to receive a signal.
- a beam used for receiving a signal also called a receiving beam, Rx beam, etc. may be used.
- radio link quality When beamforming is used, it is expected that the quality of the radio link will deteriorate because it is more susceptible to interference from obstacles. This deterioration in radio link quality may result in frequent radio link failures (RLF). When an RLF occurs, it becomes necessary to reconnect the cell, so frequent occurrences of RLF will result in a deterioration of system throughput.
- RLF radio link failures
- BR Beam Recovery
- BFR Beam Failure Recovery
- L1/L2 Layer 1/Layer 2
- a beam failure may also be referred to as a link failure.
- FIG. 10 is a diagram showing an example of an existing (e.g., Rel. 15) beam recovery procedure.
- the number of beams 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 Information RS (CSI-RS) for measuring channel states.
- SSB Synchronization Signal Block
- CSI-RS Channel State Information RS
- the SSB may also be called an SS/PBCH (Physical Broadcast Channel) block, etc.
- the RS may be at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Mobility Reference Signal (MRS), a signal included in an SSB, an SSB, a CSI-RS, a Demodulation Reference Signal (DMRS), a beam-specific signal, etc., or a signal constructed by extending or modifying these.
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- MRS Mobility Reference Signal
- DMRS Demodulation Reference Signal
- the RS measured in step S101 may be called an RS for beam failure detection (Beam Failure Detection RS (BFD-RS), RS for beam failure detection), or an RS for use in a beam recovery procedure (BFR-RS), etc.
- BFD-RS Beam Failure Detection RS
- BFR-RS beam recovery procedure
- step S102 the UE cannot detect the BFD-RS (or the reception quality of the RS deteriorates) due to interference with radio waves from the base station.
- Such interference can occur, for example, due to obstacles between the UE and the base station, fading, interference, etc.
- the UE detects a beam failure when a certain condition is met.
- the UE may detect the occurrence of a beam failure, for example, when the Block Error Rate (BLER) is less than a threshold for all configured BFD-RSs (BFD-RS resource configurations).
- BLER Block Error Rate
- BFD-RS resource configurations a threshold for all configured BFD-RSs
- the lower layer (physical (PHY) layer) of the UE may notify (indicate) a beam failure instance to the upper layer (MAC layer).
- the criteria for judgment are not limited to BLER, but may be Layer 1 Reference Signal Received Power (L1-RSRP) in the physical layer. Also, instead of or in addition to RS measurements, beam failure detection may be performed based on the Physical Downlink Control Channel (PDCCH) or the like.
- the BFD-RS may be expected to be quasi-co-located (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, when a signal/channel has a QCL relationship with another signal/channel, it may mean that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameters (e.g., spatial Rx parameters) is the same between these different signals/channels (QCL with respect to at least one of these).
- the spatial reception parameters may correspond to a reception beam (e.g., a reception analog beam) of the UE, and the beam may be identified based on a spatial QCL.
- the QCL (or at least one element of the QCL) in this disclosure may be interpreted as sQCL (spatial QCL).
- BFD-RS e.g., RS index, resource, number, number of ports, precoding, etc.
- BFD beam failure detection
- Information about BFD-RS may be referred to as information about BFR resources, etc.
- the upper layer of the UE may start a predetermined timer (which may be called a beam failure detection timer) when a beam failure instance notification is received from the PHY layer of the UE. If the MAC layer of the UE receives a certain number of beam failure instance notifications (e.g., beamFailureInstanceMaxCount set by RRC) before the timer expires, the MAC layer of the UE may trigger a BFR (e.g., start one of the random access procedures described below).
- a predetermined timer which may be called a beam failure detection timer
- the MAC layer of the UE may trigger a BFR (e.g., start one of the random access procedures described below).
- the base station may determine that the UE has detected a beam failure.
- step S103 the UE starts searching for a new candidate beam to be used for new communication in order to recover the beam.
- the UE may select a new candidate beam corresponding to a specific RS by measuring the RS.
- the RS measured in step S103 may be called a new candidate RS, an RS for identifying a new candidate beam (New Candidate Beam Identification RS (NCBI-RS)), a CBI-RS, a CB-RS (Candidate Beam RS), etc.
- the NCBI-RS may be the same as or different from the BFD-RS.
- the new candidate beam may simply be called a candidate beam or a candidate RS.
- the UE may determine a beam corresponding to an RS that satisfies a specified condition as a new candidate beam. For example, the UE may determine a new candidate beam based on an RS among the configured NCBI-RS whose L1-RSRP exceeds a threshold. Note that the criteria for determination are not limited to L1-RSRP.
- L1-RSRP related to SSB may be called SS-RSRP.
- L1-RSRP related to CSI-RS may be called CSI-RSRP.
- NCBI-RS e.g., RS resources, number, number of ports, precoding, etc.
- NCBI new candidate beam identification
- Information regarding the new candidate RS may be obtained based on information regarding the BFD-RS.
- Information regarding the NCBI-RS may be referred to as information regarding NBCI resources, etc.
- BFD-RS may be interpreted as Radio Link Monitoring RS (RLM-RS).
- RLM-RS Radio Link Monitoring RS
- the UE that has identified the new candidate beam transmits a beam recovery request (Beam Failure Recovery reQuest (BFRQ)).
- the beam recovery request may also be called a beam recovery request signal, a beam failure recovery request signal, etc.
- the BFRQ may be transmitted, for example, using at least one of an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and a configured grant (configured grant (CG)) PUSCH.
- PUCCH Physical Uplink Control Channel
- PRACH Physical 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 the BFRQ may be associated with the new candidate beam.
- the beam information may be notified using a beam index (Beam Index (BI)), a port index of a specific reference signal, an RS index, a resource index (e.g., a CSI-RS resource indicator (CRI) or an SSB resource indicator (SSBRI)), etc.
- BI Beam Index
- a port index of a specific reference signal e.g., a CSI-RS resource indicator (CRI) or an SSB resource indicator (SSBRI)
- CRI CSI-RS resource indicator
- SSBRI SSB resource indicator
- CB-BFR Contention-Based BFR
- CF-BFR Contention-Free BFR
- the UE may use the PRACH resource to transmit a preamble (also called a RA preamble, random access channel (Physical Random Access Channel (PRACH)), RACH preamble, etc.) as a BFRQ.
- a preamble also called a RA preamble, random access channel (Physical Random Access Channel (PRACH)
- PRACH Physical Random Access Channel
- RACH Physical Random Access Channel
- a UE may transmit a preamble randomly selected from one or more preambles.
- a UE may transmit a preamble that is assigned to the UE by the base station.
- a base station may assign the same preamble to multiple UEs.
- a base station may assign a preamble to each UE individually.
- CB-BFR and CF-BFR may be 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)), respectively.
- CBRA-BFR may be referred to as CBRA for BFR.
- CFRA-BFR may be referred to as CFRA for BFR.
- information regarding the PRACH resource may be notified, for example, by higher layer signaling (such as RRC signaling).
- the information may include information indicating the correspondence between the detected DL-RS (beam) and the PRACH resource, and a different PRACH resource 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, etc.) to the BFRQ from the UE.
- the response signal may include reconfiguration information (e.g., configuration information of DL-RS resources) for one or more beams.
- the response signal may be transmitted, for example, in the UE common search space of the PDCCH.
- the response signal may be notified using a PDCCH (DCI) scrambled with a Cyclic Redundancy Check (CRC) by the UE's identifier (for example, the Cell-Radio RNTI (C-RNTI)).
- DCI PDCCH
- CRC Cyclic Redundancy Check
- the UE may determine at least one of the transmit beam and receive beam to be used based on the beam reconfiguration information.
- the UE may monitor the response signal based on at least one of a control resource set for BFR (COntrol REsource SET (CORESET)) and a search space set for BFR.
- a control resource set for BFR COntrol REsource SET (CORESET)
- CORESET COntrol REsource SET
- contention resolution may be determined to be successful if the UE receives a PDCCH corresponding to its own C-RNTI.
- a period may be set for the UE to monitor a response from a base station (e.g., a gNB) to the BFRQ.
- the period may be called, for example, a gNB response window, a gNB window, a beam recovery request response window, etc.
- the UE may retransmit the BFRQ if no gNB response is detected within the window period.
- the UE may transmit a message to the base station indicating that the beam reconfiguration is complete.
- the message may be transmitted, for example, via the PUCCH or the PUSCH.
- Beam recovery success may represent, for example, the case where step S106 has been reached.
- beam recovery failure may represent, for example, the case where a predetermined number of BFRQ transmissions have been made or the beam failure recovery timer (Beam-failure-recovery-Timer) has expired.
- the beam recovery procedure (e.g., BFRQ notification) for beam failure detected in the SpCell (PCell/PSCell) can be performed using a random access procedure.
- the beam recovery procedure (e.g., BFRQ notification) for beam failure detected in the SCell can be performed using at least one of PUCCH (e.g., Scheduling Request (SR)) transmission for BFR and MAC CE (e.g., UL-SCH) transmission for BFR.
- PUCCH e.g., Scheduling Request (SR)
- MAC CE e.g., UL-SCH
- the UE may transmit information about beam failure 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 a new candidate beam (or a new candidate RS index).
- Step 1 If BF is detected, PUCCH-BFR (Scheduling Request (SR)) may be transmitted from the UE to the PCell/PSCell. Then, a UL grant (DCI) for the following step 2 may be transmitted from the PCell/PSCell to the UE. If a beam failure is detected and there is a MAC CE (or UL-SCH) for transmitting information about a new candidate beam, step 1 (e.g., PUCCH transmission) may be omitted and step 2 (e.g., MAC CE transmission) may be performed.
- PUCCH-BFR Scheduling Request (SR)
- DCI UL grant
- step 1 e.g., PUCCH transmission
- step 2 e.g., MAC CE transmission
- the UE may transmit information about the cell where the beam failure was detected (failed) (e.g., cell index) and information about the new candidate beam to the base station (PCell/PSCell) via an uplink channel (e.g., PUSCH) using the MAC CE.
- the QCL of the PDCCH/PUCCH/PDSCH/PUSCH may be updated to the new beam after a predetermined period (e.g., 28 symbols) after receiving a response signal from the base station.
- FIG 11 is a diagram showing an example of a configuration for BFR (BeamFailureRecoveryConfig) configured in a UE.
- BFR BeamFailureRecoveryConfig
- the above-mentioned BFD/BFR can be configured in both the SpCell and the SCell.
- an additional configuration may be included for the SpCell.
- the higher layer signaling for the BFR configuration may include spCell-BFR-CBRA-r16 as a configuration for the SpCell.
- This parameter may indicate that the UE is configured to transmit a BFR MAC CE for the BFR of the SpCell.
- the BFD/BFR configuration for the SpCell and the BFD/BFR configuration for the SCell may be different (may be configured separately).
- the UE may be provided with a set of periodic (P)-CSI-RS resource configuration indices q0 via failure detection resources (failureDetectionResources, failureDetectionResourcesToAddModList, RadioLinkMonitoringConfig) and at least one set of P-CSI-RS resource configuration indices and SS/PBCH block indices q1 via a candidate beam RS list (candidateBeamRSList) or an extended candidate beam RS list (candidateBeamRSListExt-r16) or a candidate beam RS list for SCell (candidateBeamRSSCellList-r16).
- failure detection resources failure detection resources
- failureDetectionResources failureDetectionResourcesToAddModList
- RadioLinkMonitoringConfig RadioLinkMonitoringConfig
- the q 0 bar is a notation with an overline added to "q 0 ".
- the q 0 bar will be simply written as q 0.
- the q 1 bar is a notation with an overline added to "q 1 ".
- the q 1 bar will be simply written as q 1 .
- the set of P-CSI-RS resources q 0 provided by the failure detection resources may be referred to as explicit BFD-RS.
- the UE may perform L1-RSRP measurement, etc., using RS resources corresponding to indices included in at least one of set q0 and set q1 to detect beam failure.
- provision of the above-mentioned higher layer parameters indicating information of an index corresponding to a BFD resource may be interpreted as configuring a BFD resource, configuring a BFD-RS, etc.
- the BFD resource, the periodic CSI-RS resource configuration index or the set of SSB indices q 0 , the BFD-RS, the BFD-RS set, and the RS set may be interpreted as mutually interchangeable.
- the UE If the UE is not provided with q0 by failure detection resources for one BWP of its serving cell, it decides to include in set q0 a P-CSI-RS resource configuration index that has the same value as an RS index in the RS set indicated by the TCI-State for the corresponding CORESET that the UE uses for monitoring PDCCH. If there are two RS indices in one TCI state, set q0 includes the RS index with QCL type D configuration for the corresponding TCI state. The UE assumes that set q0 includes up to two RS indices. The UE assumes single-port RS in set q0 .
- This set q 0 may be referred to as the implicit BFD-RS (eg, implicit BFR-RS).
- the UE determines the reference signal (BFD-RS (RS set)) to be used for beam failure detection/beam recovery procedures based on the TCI state for PDCCH.
- the UE assumes that the RS set includes up to two RSs.
- the UE may be configured with parameters (PUCCH configuration information, i.e., PUCCH-Config) used for PUCCH transmission.
- PUCCH configuration information i.e., PUCCH-Config
- FIG. 12 shows a part of the PUCCH configuration (e.g., IE PUCCH-Config) included in the UE-specific UL BWP configuration (upper layer parameters (BWP-UplinkDedicated)).
- the parameter may indicate PUCCH configuration for a BWP on one of the normal UL/Supplemental UL of the serving cell. If the UE is configured with SUL, the network may configure PUCCH only on one of the BWPs on the UL (normal UL/SUL).
- the network may configure PUCCH-Config in at least the non-initial BWP of the SpCell and all BPWs of the PUCCH SCell. If supported by the UE, the network may configure up to one additional SCell (i.e. PUCCH SCell) as a cell group with PUCCH-Config. That is, an SpCell can be configured with (by) PUCCH-Config, and there is at most one SCell (PUCCH SCell) that can be configured with (by) PUCCH-Config.
- PUCCH SCell i.e. PUCCH SCell
- the target PCell/SCell for switching can be the current SCell/PCell. That is, the current SCell/PCell can be configured as a candidate.
- the candidate delta configuration can also be applied on top of the reference configuration to form a complete candidate configuration.
- the application timing can be, for example, at/before cell switching.
- the complete candidate configuration may be applied to replace the current UE configuration (when performing a reconfiguration/cell switch). This may be performed by an RRC reconfiguration procedure that replaces the configuration but does not necessarily reset the RLC/PDCP.
- ⁇ RLM/RLF setting for SpCell only BFD/BFR setting only for the SpCell and BFD/BFR setting only for the SCell (i.e., the BFD/BFR setting is different between the SpCell and the SCell)
- Configuration of PUCCH SCell SCell configured together with PUCCH by PUCCH-Config.
- the question here is whether or not the above-mentioned settings need to be configured for each candidate cell. For example, if a cell switching command triggers an SpCell switch or a cell group switch, it is not clear whether and how to apply the above-mentioned settings. If these are not clear, UE operation corresponding to cell switching cannot be appropriately controlled, and communication quality may deteriorate.
- the inventors therefore focused on various settings (settings related to RLM/BFR/PUCCH) that correspond to the type of candidate cell during cell switching and came up with one aspect of the present embodiment.
- A/B and “at least one of A and B” may be interpreted as interchangeable.
- A/B/C may mean “at least one of A, B, and C.”
- Radio Resource Control RRC
- RRC parameters RRC parameters
- RRC messages higher layer parameters
- information elements IEs
- settings etc.
- MAC Control Element CE
- update commands activation/deactivation commands, etc.
- the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, other messages (e.g., messages from the core network such as positioning protocols (e.g., NR Positioning Protocol A (NRPPa)/LTE Positioning Protocol (LPP)) messages), or a combination of these.
- RRC Radio Resource Control
- MAC Medium Access Control
- LPP LTE Positioning Protocol
- the MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc.
- the broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.
- MIB Master Information Block
- SIB System Information Block
- RMSI Remaining Minimum System Information
- OSI System Information
- the physical layer signaling may be, for example, Downlink Control Information (DCI), Uplink Control Information (UCI), etc.
- DCI Downlink Control Information
- UCI Uplink Control Information
- index identifier
- indicator indicator
- resource ID etc.
- sequence list, set, group, cluster, subset, etc.
- TRP
- the spatial relationship information identifier (ID) (TCI state ID) and the spatial relationship information (TCI state) may be interpreted as interchangeable.
- “Spatial relationship information” may be interpreted as “set of spatial relationship information”, “one or more pieces of spatial relationship information”, etc.
- TCI state and TCI may be interpreted as interchangeable.
- the panel identifier (ID) and panel may be read as interchangeable.
- the TRP ID and TRP, the CORESET group ID and CORESET group, etc. may be read as interchangeable.
- TRP transmission point
- panel DMRS port group
- CORESET pool one of two TCI states associated with one code point in the TCI field
- the transmission/reception of a channel/signal using a single TRP may be interpreted as the TCI states (joint/separate/indicative TCI states) being equal in the transmission/reception of that channel/signal (e.g., NCJT/CJT/repeat), or the number of TCI states (joint/separate/indicative TCI states) being one in the transmission/reception of that channel/signal (e.g., NCJT/CJT/repeat).
- Transmission/reception of a channel/signal using a single TRP may be interpreted as the TCI states (joint/separate/indicated TCI states) being different in the transmission/reception of that channel/signal (e.g., NCJT/CJT/repeat), or the number of different TCI states (joint/separate/indicated TCI states) being multiple (e.g., two) in the transmission/reception of that channel/signal (e.g., NCJT/CJT/repeat).
- single TRP, single TRP system, single TRP transmission, and single PDSCH may be read as interchangeable.
- multi-TRP, multi-TRP system, multi-TRP transmission, and multi-PDSCH may be read as interchangeable.
- a single DCI, a single PDCCH, multiple TRP based on a single DCI, activating two TCI states on at least one TCI code point, mapping at least one code point of a TCI field to two TCI states, and setting a specific index (e.g., a TRP index, a CORESET pool index, or an index corresponding to a TRP) for a specific channel/CORESET may be interpreted as interchangeable.
- a single TRP, a channel/signal using a single TRP, a channel using one TCI state/spatial relationship, multi-TRP not being enabled by RRC/DCI, multiple TCI states/spatial relationships not being enabled by RRC/DCI, a CORESETPoolIndex value of 1 not being set for any CORESET, and no code point in the TCI field being mapped to two TCI states may be read as interchangeable.
- multi-TRP channel/signal using multi-TRP, channel using multiple TCI states/spatial relationships, multi-TRP enabled by RRC/DCI, multiple TCI states/spatial relationships enabled by RRC/DCI, and at least one of multi-TRP based on a single DCI and multi-TRP based on multiple DCI may be read as interchangeable.
- multi-TRP based on multi-DCI setting one CORESET pool index (CORESETPoolIndex) value for a CORESET
- multiple specific indexes e.g., TRP indexes, CORESET pool indexes, or indexes corresponding to TRPs
- TRP#2 (second TRP)
- single DCI sDCI
- single PDCCH multi-TRP system based on single DCI
- sDCI-based MTRP multi-TRP system based on single DCI
- activation of two TCI states on at least one TCI codepoint may be read as interchangeable.
- multi-DCI multi-PDCI
- multi-PDCCH multi-PDCCH
- multi-TRP system based on multi-DCI
- mDCI-based MTRP two CORESET pool indices
- channel, signal, and channel/signal may be read as interchangeable.
- DL channel, DL signal, DL signal/channel, transmission/reception of DL signal/channel, DL reception, and DL transmission may be read as interchangeable.
- UL channel, UL signal, UL signal/channel, transmission/reception of UL signal/channel, UL reception, and UL transmission may be read as interchangeable.
- applying TCI state/QCL assumptions to each channel/signal/resource may mean applying TCI state/QCL assumptions to transmission and reception of each channel/signal/resource.
- the first TRP may correspond to the first TCI state (the first TCI state indicated).
- the second TRP may correspond to the second TCI state (the second TCI state indicated).
- the nth TRP may correspond to the nth TCI state (the nth TCI state indicated).
- the first CORESET pool index value (e.g., 0), the first TRP index value (e.g., 1), and the first TCI state (first DL/UL (joint/separate) TCI state) may correspond to each other.
- the second CORESET pool index value (e.g., 1), the second TRP index value (e.g., 2), and the second TCI state (second DL/UL (joint/separate) TCI state) may correspond to each other.
- the application of multiple TCI states in transmission and reception using multiple TRPs will be mainly described in terms of a method targeting two TRPs (i.e., when at least one of N and M is 2), but the number of TRPs may be three or more (multiple), and each embodiment may be applied to correspond to the number of TRPs. In other words, at least one of N and M may be a number greater than 2.
- the joint TCI state, DL/UL TCI state, separate TCI state, and separate DL/UL TCI state may be interpreted as mutually interchangeable.
- the indicated joint TCI state, indicated DL/UL TCI state, and indicated TCI state may be interpreted as mutually interchangeable.
- TRP CORESET pool index (CORESETPoolIndex)
- CORESETPoolIndex ID related to TRP
- TAG ID ID related to TRP
- TCI state group ID related to TRP
- TAG ID ID related to TRP
- TCI state group ID related to TRP
- TAG ID ID related to TRP
- TCI state group ID related to TRP
- TAG ID ID related to TRP
- TCI state group TCI state group
- spatial relationship group QCL source RS group
- DL RS group DL RS group
- path loss RS group path loss RS group
- PCI for inter-cell multi-TRP
- being associated with different TRPs being associated with different CORESET pool indices (CORESETPoolIndex), being associated with different TRP IDs, being associated with different IDs related to TRPs, being associated with different TAG IDs, being associated with different TCI state groups, being associated with different spatial relationship groups, being associated with different QCL source RS groups, being associated with different DL RS groups, being associated with different path loss RS groups, being associated with different PCIs (for inter-cell multi-TRP) may be read as interchangeable.
- CORESETPoolIndex CORESET pool indices
- Each embodiment of the present disclosure may be applied to at least one of intra-cell multi-TRP and inter-cell multi-TRP.
- intra-cell multi-TRP may mean that the activated TCI states of multiple (e.g., two) TRPs are associated with the same PCI.
- inter-cell multi-TRP may mean that the activated TCI states of multiple (e.g., two) TRPs are associated with different PCIs.
- multiple (e.g., two) TRPs may mean multiple (e.g., two) TRPs associated with multiple (e.g., two) PCIs.
- non-serving cell additional cell, candidate cell, and target cell may be interpreted as interchangeable.
- the reference cell may be read as a reference cell, a specific cell, or a reference cell.
- the reference cell may be, for example, a specific cell, or a cell for which a TA value is specified/obtained.
- the reference cell may be defined in a specification, or may be set/specified to the UE by the base station via RRC/MAC CE/DCI.
- standard TRP may be read as reference TRP, specific TRP, or reference TRP.
- RLM settings BFD settings
- PUCCH settings PUCCH settings
- reference settings may be interpreted as interchangeable.
- the cell switching command (L1/L2 signal (e.g., DCI/MAC CE)
- cell switching instruction information e.g., cell switching instruction information
- information related to cell switching may be interpreted as interchangeable.
- the following embodiments may be applied when a RACH procedure is configured/supported for each TRP (or for each serving cell/additional cell/non-serving cell).
- the following embodiments may be applied when a timing advance/timing advance group is configured/supported for each TRP (or for each serving cell/additional cell/non-serving cell).
- L1/L2 inter cell mobility e.g., L1/L2 inter cell mobility
- L1/L2 intra cell mobility may be interpreted as at least one of cell switching, cell switch, and cell change.
- the first embodiment relates to an RLM configuration.
- Fig. 13 is a diagram illustrating an example of a UE operation according to the first embodiment.
- Each candidate cell may be configured with (by) an RLM configuration, i.e., an RLM configuration may be configured for each candidate cell, which may be included in the higher layer parameters (IE CellGroupConfig) for each LTM candidate cell configuration.
- IE CellGroupConfig higher layer parameters
- the target candidate cell becomes the new SpCell and the UE applies its RLM settings. That is, when the UE receives a cell switching command (MAC CE) for an SpCell, it may apply the RLM settings corresponding to the SpCell as a target candidate cell (see Figure 13).
- MAC CE cell switching command
- the UE may apply the RLM settings of the new SpCell and ignore the RLM settings of the new SCell. That is, when the UE receives a cell switching command (MAC CE) for cell group switching, it may apply the RLM settings of only the SpCell (see Figure 13).
- MAC CE cell switching command
- an RLM configuration may be provided for that SCell.
- the UE will not apply the corresponding RLM configuration until the above conditions are met (e.g., receiving a cell switch command (MAC CE) for the specific cell). Note that under existing rules, an RLM configuration is not provided for the SCell.
- the RLM configuration may be configured in a reference configuration. That is, the RLM configuration may be applied to any candidate cell. For example, when a MAC CE for a cell switch command is sent for switching an SpCell or a cell group, the UE applies the RLM configuration to the new SpCell. That is, when the UE receives a cell switch command (MAC CE) for switching an SpCell or a cell group, the UE may apply the RLM configuration corresponding to the SpCell (see FIG. 13).
- MAC CE cell switch command
- the RRC may be allowed to not provide an RLM configuration for an LTM candidate cell.
- the UE may derive the RLM-RS implicitly.
- the following options 3-1 to 3-2 are available as methods for deriving the RLM-RS.
- the beam/TCI state of the target SpCell will be sent by the cell switch command, i.e., the cell switch command (MAC CE) may include information indicating the beam/TCI state for the target SpCell (new SpCell).
- the UE When the UE receives the cell switch command, it implicitly derives the RS associated with the indicated TCI state for the new SpCell as the RLM-RS (see Figure 13).
- the UE may perform the implicit derivation method of the RLM-RS until the RLM-RS is explicitly configured/updated by higher layer signaling (RRC/MAC CE).
- the UE derives the RLM-RS for the new SpCell based on the existing rules.
- the UE can appropriately control RLM for a candidate cell/serving cell (a new cell to which the switch is to be made) based on the cell switch command.
- Fig. 14 is a diagram showing an example of a UE operation according to the second embodiment.
- the second embodiment can be applied by replacing the RLM of the first embodiment with BFD.
- Each candidate cell may be configured with (by) a BFD configuration, i.e., a BFD configuration may be configured for each candidate cell.
- the BFD configuration may be included in the higher layer parameters (IE CellGroupConfig) for each LTM candidate cell configuration.
- the parameters related to the BFD configuration may include, for example, the spCell-BFR-CBRA-r16 mentioned above.
- the target candidate cell becomes the new SpCell and the UE applies its BFD settings. That is, when the UE receives a cell switching command (MAC CE) for an SpCell, it may apply the BFD settings corresponding to the SpCell as the target candidate cell (see Figure 14).
- MAC CE cell switching command
- the UE may apply the BFD settings of the new SpCell and ignore the BFD settings of the new SCell. That is, when the UE receives a cell switching command (MAC CE) for cell group switching, it may apply the BFD settings of only the SpCell (see Figure 14).
- MAC CE cell switching command
- BFD configuration may be provided for that SCell.
- the UE will not apply the corresponding BFD configuration until the above conditions are met (e.g., receiving a cell switch command (MAC CE) for the specific cell). Note that under existing rules, RLM configuration is not provided for the SCell.
- the BFD configuration may be configured in a reference configuration. That is, the BFD configuration may be applied to any candidate cell. For example, when a MAC CE for a cell switch command is transmitted for switching an SpCell or a cell group, the UE applies the BFD configuration to the new SpCell and the new SCell. That is, when the UE receives a cell switch command (MAC CE) for switching an SpCell or a cell group, the UE may apply the BFD configurations corresponding to the SpCell and the SCell, respectively (see FIG. 14). Note that it may be assumed that the SpCell BFR parameter is applied only to the new SpCell.
- MAC CE cell switch command
- the BFD configurations except for the SpCell BFR parameters, may be configured for each candidate cell, whereas the SpCell BFR parameters may be configured in the reference configuration, i.e., the BFR parameters for a particular cell may be configured separately from other parameters (BFD configurations).
- the UE may implicitly derive the BFD-RS.
- the following options 3-1 to 3-2 are available as methods for deriving the BFD-RS.
- the beam/TCI state of the target SpCell will be sent by the cell switch command, i.e., the cell switch command (MAC CE) may include information indicating the beam/TCI state for the target SpCell (new SpCell).
- the UE When the UE receives the cell switch command, it implicitly derives the RS associated with the indicated TCI state as the BFD-RS (see Figure 14). The UE may execute the implicit derivation method of the BFD-RS until the BFD-RS is explicitly configured/updated by higher layer signaling (RRC/MAC CE).
- RRC/MAC CE higher layer signaling
- the UE derives the BFD-RS for each new SCell based on the existing rules.
- the UE can appropriately control BFD/BFR for a candidate cell/serving cell (a new cell to which the UE is to switch) based on a cell switching command.
- the first embodiment relates to PUCCH configuration (PUCCH-Config).
- Fig. 15 is a diagram showing an example of a UE operation according to the third embodiment.
- the third embodiment can be applied by replacing the RLM of the first embodiment/BFD of the second embodiment with PUCCH.
- the PUCCH configuration, the PUCCH-Config configuration, and the PUCCH-Config may be replaced with each other.
- Each candidate cell may be configured with (by) a PUCCH-Config configuration (PUCCH configuration), i.e., a PUCCH-Config configuration may be configured for each candidate cell.
- PUCCH configuration i.e., a PUCCH-Config configuration may be configured for each candidate cell.
- the PUCCH-Config configuration may be included in the higher layer parameters (IE CellGroupConfig) for each LTM candidate cell configuration.
- the target candidate cell becomes the new SpCell and the UE applies the PUCCH-Config settings.
- the UE may apply the PUCCH-Config settings corresponding to the SpCell as the target candidate cell (see Figure 15).
- the existing PUCCH SCell is no longer the PUCCH SCell. After a cell switch, there is no PUCCH SCell until the NW configures/indicates a new PUCCH SCell, i.e. the UE may assume that there is no PUCCH SCell until it receives a configuration/indication corresponding to the new PUCCH SCell from the NW.
- the UE may apply the PUCCH-Config settings of the new SpCell. That is, when the UE receives a cell switching command (MAC CE) for cell group switching, it may apply the PUCCH-Config settings corresponding to the SpCell (see Figure 15). On the other hand, the UE may apply the operations of Options 1-1 to 1-3 below to the new SCell.
- MAC CE cell switching command
- the UE may ignore the PUCCH-Config setting for each new SCell.
- the UE may ignore the configuration of the PUCCH-Config for each new SCell until (unless) the NW configures/indicates at most one SCell as a new PUCCH SCell by higher layer signaling/physical layer signaling.
- one additional candidate cell index may be indicated as the PUCCH SCell by the cell switch command (MAC CE).
- the UE may select one SCell as the PUCCH SCell based on a predefined rule.
- the selection rule may be that the SCell that can be selected is the new SCell with the smallest cell ID. Whether or not such a selection rule is applied may be configured by a new parameter (for example, a reference setting described later).
- the PUCCH-Config configuration may be provided for that SCell.
- the UE will not apply the corresponding PUCCH-Config configuration until the above conditions (e.g., receiving a cell switch command (MAC CE) for the specific cell) are met or new parameters for the configuration to apply are indicated.
- the parameters e.g., PUCCH-Config
- the PUCCH-Config configuration may be configured in a reference configuration. That is, the PUCCH-Config configuration may be applied to any candidate cell.
- the UE when a MAC CE for a cell switch command is transmitted for switching an SpCell or a cell group, the UE applies the PUCCH-Config configuration to the new SpCell. That is, when the UE receives a cell switch command (MAC CE) for switching an SpCell or a cell group, the UE may apply the PUCCH-Config configuration corresponding to the SpCell (see FIG. 15).
- MAC CE cell switch command
- the target candidate cell becomes the new SpCell and the UE applies the PUCCH-Config settings.
- the UE may apply the PUCCH-Config settings corresponding to the SpCell as the target candidate cell (see Figure 15).
- the existing PUCCH SCell is no longer the PUCCH SCell. After a cell switch, there is no PUCCH SCell until the NW configures/indicates a new PUCCH SCell, i.e. the UE may assume that there is no PUCCH SCell until it receives a configuration/indication corresponding to the new PUCCH SCell from the NW.
- the UE may apply the PUCCH-Config settings of the new SpCell. That is, when the UE receives a cell switching command (MAC CE) for cell group switching, it may apply the PUCCH-Config settings corresponding to the SpCell (see Figure 15). On the other hand, the UE may apply the operations of Options 2-1 to 2-3 below to the new SCell.
- MAC CE cell switching command
- the UE may ignore the PUCCH-Config setting for each new SCell.
- the UE may ignore the configuration of the PUCCH-Config for each new SCell until (unless) the NW configures/indicates at most one SCell as a new PUCCH SCell by higher layer signaling/physical layer signaling.
- one additional candidate cell index may be indicated as the PUCCH SCell by the cell switch command (MAC CE).
- the UE may select one SCell as the PUCCH SCell based on a predefined rule, e.g., the selection rule may be that the SCell that can be selected is the new SCell with the smallest cell ID, and whether such a selection rule is applied may be configured by a new parameter (e.g., reference configuration).
- a predefined rule e.g., the selection rule may be that the SCell that can be selected is the new SCell with the smallest cell ID, and whether such a selection rule is applied may be configured by a new parameter (e.g., reference configuration).
- the UE can appropriately control the application of the PUCCH-Config settings to the candidate cell/serving cell (the new cell to which the switch is to be made) based on the cell switch command.
- any information may be notified to the UE (from a network (NW) (e.g., a base station (BS))) (in other words, any information is received from the BS by the UE) using physical layer signaling (e.g., DCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel (e.g., PDCCH, PDSCH, reference signal), or a combination thereof.
- NW network
- BS base station
- the MAC CE may be identified by including in the MAC subheader a new Logical Channel ID (LCID) that is not specified in existing standards.
- LCID Logical Channel ID
- the notification When the notification is made by a DCI, the notification may be made by a specific field of the DCI, a Radio Network Temporary Identifier (RNTI) used to scramble Cyclic Redundancy Check (CRC) bits assigned to the DCI, the format of the DCI, etc.
- RNTI Radio Network Temporary Identifier
- CRC Cyclic Redundancy Check
- notification of any information to the UE in the above-mentioned embodiments may be performed periodically, semi-persistently, or aperiodically.
- notification of any information from the UE (to the NW) may be performed using physical layer signaling (e.g., UCI), higher layer signaling (e.g., RRC signaling, MAC CE), a specific signal/channel (e.g., PUCCH, PUSCH, PRACH, reference signal), or a combination thereof.
- physical layer signaling e.g., UCI
- higher layer signaling e.g., RRC signaling, MAC CE
- a specific signal/channel e.g., PUCCH, PUSCH, PRACH, reference signal
- the MAC CE may be identified by including a new LCID in the MAC subheader that is not specified in existing standards.
- the notification may be transmitted using PUCCH or PUSCH.
- notification of any information from the UE may be performed periodically, semi-persistently, or aperiodically.
- At least one of the above-mentioned embodiments may be applied when a specific condition is met, which may be specified in a standard or may be notified to a UE/BS using higher layer signaling/physical layer signaling.
- At least one of the above-described embodiments may be applied only to UEs that have reported or support a particular UE capability.
- the specific UE capabilities may indicate at least one of the following: - Supporting specific processing/operations/control/information for at least one of the above embodiments.
- RFD-RS for candidate cells (RFD configuration).
- Supporting PUCCH-Config setting (PUCCH setting) for candidate cells.
- the above-mentioned specific UE capabilities may be capabilities that are applied across all frequencies (commonly regardless of frequency), capabilities per frequency (e.g., one or a combination of a cell, band, band combination, BWP, component carrier, etc.), capabilities per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), capabilities per subcarrier spacing (SubCarrier Spacing (SCS)), or capabilities per Feature Set (FS) or Feature Set Per Component-carrier (FSPC).
- FR1 Frequency Range 1
- FR2 FR2, FR3, FR4, FR5, FR2-1, FR2-2
- SCS subcarrier Spacing
- FS Feature Set
- FSPC Feature Set Per Component-carrier
- the above-mentioned specific UE capabilities may be capabilities that are applied across all duplexing methods (commonly regardless of the duplexing method), or may be capabilities for each duplexing method (e.g., Time Division Duplex (TDD) and Frequency Division Duplex (FDD)).
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- the above-mentioned embodiments may be applied when the UE configures/activates/triggers specific information related to the above-mentioned embodiments (or performs the operations of the above-mentioned embodiments) by higher layer signaling/physical layer signaling.
- the specific information may be information indicating enabling a random access procedure/PRACH transmission without RAR monitoring, any RRC parameters for a specific release (e.g., Rel. 18/19), etc.
- the UE may, for example, apply Rel. 15/16 operations.
- a receiving unit that receives a Medium Access Control Element (MAC CE) related to cell switching;
- a terminal comprising: a control unit that controls application of at least one setting of radio link monitoring (RLM), beam failure detection (BFD), and uplink control channel (PUCCH) for a specific cell based on information included in the MAC CE.
- RLM radio link monitoring
- BFD beam failure detection
- PUCCH uplink control channel
- Wired 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 wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.
- FIG. 16 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- the wireless communication system 1 (which may simply be referred to as system 1) may be a system that realizes communication using Long Term Evolution (LTE) specified by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.
- LTE Long Term Evolution
- 3GPP Third Generation Partnership Project
- 5G NR 5th generation mobile communication system New Radio
- the wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- MR-DC may include 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 may include 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.
- E-UTRA 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 may support dual connectivity between multiple base stations within the same RAT (e.g., dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).
- dual connectivity in which both the MN and SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).
- gNBs NR base stations
- N-DC Dual Connectivity
- the wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged within the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1.
- a user terminal 20 may be located within at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.
- the user terminal 20 may be connected to at least one of the multiple base stations 10.
- the user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple 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 a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)).
- Macro cell C1 may be included in FR1
- 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
- the multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to the Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication).
- wire e.g., optical fiber conforming to the Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication e.g., NR communication
- base station 11 which corresponds to the upper station
- IAB Integrated Access Backhaul
- base station 12 which corresponds to a 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 an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), etc.
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the core network 30 may include network functions (Network Functions (NF)) such as, for example, a User Plane Function (UPF), an Access and Mobility management Function (AMF), a Session Management Function (SMF), a Unified Data Management (UDM), an Application Function (AF), a Data Network (DN), a Location Management Function (LMF), and Operation, Administration and Maintenance (Management) (OAM).
- NF Network Functions
- UPF User Plane Function
- AMF Access and Mobility management Function
- SMF Session Management Function
- UDM Unified Data Management
- AF Application Function
- DN Data Network
- LMF Location Management Function
- OAM Operation, Administration and Maintenance
- the user terminal 20 may be a terminal that supports at least one of the communication methods such as LTE, LTE-A, and 5G.
- a wireless access method based on Orthogonal Frequency Division Multiplexing may be used.
- OFDM Orthogonal Frequency Division Multiplexing
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the radio access method may also be called a waveform.
- other radio access methods e.g., other single-carrier transmission methods, other multi-carrier transmission methods
- a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.
- PDSCH Physical Downlink Shared Channel
- PBCH Physical Broadcast Channel
- PDCCH Physical Downlink Control Channel
- an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- SIB System Information Block
- PDSCH User data, upper layer control information, System Information Block (SIB), etc.
- SIB System Information Block
- PUSCH User data, upper layer control information, etc.
- MIB Master Information Block
- PBCH Physical Broadcast Channel
- Lower layer control information may be transmitted by the PDCCH.
- the lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.
- DCI Downlink Control Information
- the DCI for scheduling the PDSCH may be called a DL assignment or DL DCI
- the DCI for scheduling the PUSCH may be called a UL grant or UL DCI.
- the PDSCH may be interpreted as DL data
- the PUSCH may be interpreted as UL data.
- a control resource set (COntrol REsource SET (CORESET)) and a search space may be used to detect the PDCCH.
- the CORESET corresponds to the resources to search for DCI.
- the search space corresponds to the search region and search method of PDCCH candidates.
- One CORESET may be associated with one or multiple search spaces. The UE may monitor the CORESET associated with a search space based on the search space configuration.
- a 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 the terms “search space,” “search space set,” “search space setting,” “search space set setting,” “CORESET,” “CORESET setting,” etc. in this disclosure may be read as interchangeable.
- the PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK/NACK, etc.), and a scheduling request (SR).
- UCI uplink control information
- CSI channel state information
- HARQ-ACK Hybrid Automatic Repeat reQuest ACKnowledgement
- ACK/NACK ACK/NACK
- SR scheduling request
- the PRACH may transmit a random access preamble for establishing a connection with a cell.
- downlink, uplink, etc. may be expressed without adding "link.”
- various channels may be expressed without adding "Physical” to the beginning.
- a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted.
- a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.
- the synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS).
- a signal block including an SS (PSS, SSS) and a PBCH (and a DMRS for PBCH) may be called an SS/PBCH block, an SS Block (SSB), etc.
- the SS, SSB, etc. may also be called a reference signal.
- a measurement reference signal Sounding Reference Signal (SRS)
- a demodulation reference signal DMRS
- UL-RS uplink reference signal
- DMRS may also be called a user equipment-specific reference signal (UE-specific Reference Signal).
- the base station 17 is a diagram showing an example of the configuration of a base station according to an embodiment.
- the base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.
- this example mainly shows the functional blocks of the characteristic parts of this embodiment, and the base station 10 may also be assumed to have other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.
- the control unit 110 controls the entire base station 10.
- the control unit 110 can be configured from a controller, a control circuit, etc., which are described based on a common understanding in the technical field to which this disclosure pertains.
- the control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc.
- the control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc.
- the control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 120.
- the control unit 110 may perform call processing of communication channels (setting, release, etc.), status management of the base station 10, management of radio resources, etc.
- the transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123.
- the baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212.
- the transceiver unit 120 may be composed of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on a common understanding in the technical field to which the present disclosure relates.
- the transceiver 120 may be configured as an integrated transceiver, or may be composed of a transmitter and a receiver.
- the transmitter may be composed of a transmission processing unit 1211 and an RF unit 122.
- the receiver may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.
- the transmitting/receiving antenna 130 can be configured as an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.
- the transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc.
- the transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.
- the transceiver 120 may form at least one of the transmit beam and receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.
- digital beamforming e.g., precoding
- analog beamforming e.g., phase rotation
- the transceiver 120 may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data and control information obtained from the control unit 110 to generate a bit string to be transmitted.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control HARQ retransmission control
- the transceiver 120 may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- channel coding which may include error correction coding
- DFT Discrete Fourier Transform
- IFFT Inverse Fast Fourier Transform
- the transceiver unit 120 may perform modulation, filtering, amplification, etc., on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 130.
- the transceiver unit 120 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 130.
- the transceiver 120 may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.
- reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.
- FFT Fast Fourier Transform
- IDFT Inverse Discrete Fourier Transform
- the transceiver 120 may perform measurements on the received signal.
- the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal.
- the measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc.
- RSRP Reference Signal Received Power
- RSSI Received Signal Strength Indicator
- the measurement results may be output to the control unit 110.
- the transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30 (e.g., network nodes providing NF), other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.
- devices included in the core network 30 e.g., network nodes providing NF
- other base stations 10, etc. may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.
- the transmitting section and receiving section of the base station 10 in this disclosure may be configured with at least one of the transmitting/receiving section 120, the transmitting/receiving antenna 130, and the transmission path interface 140.
- the transmitting unit 120 may transmit a Medium Access Control Control Element (MAC CE) related to cell switching.
- MAC CE Medium Access Control Control Element
- the control unit 110 may control the generation of information for the terminal to determine the application of at least one of the settings of radio link monitoring (RLM), beam interference detection (BFD), and uplink control channel (PUCCH) for a specific cell based on the information included in the MAC CE.
- RLM radio link monitoring
- BFD beam interference detection
- PUCCH uplink control channel
- the user terminal 18 is a diagram showing an example of the configuration of a user terminal according to an embodiment.
- the user terminal 20 includes a control unit 210, a transmitting/receiving unit 220, and a transmitting/receiving antenna 230.
- the control unit 210, the transmitting/receiving unit 220, and the transmitting/receiving antenna 230 may each include one or more.
- this example mainly shows the functional blocks of the characteristic parts of this embodiment, and the user terminal 20 may also be assumed to have other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.
- the control unit 210 controls the entire user terminal 20.
- the control unit 210 can be configured from a controller, a control circuit, etc., which are described based on a common understanding in the technical field to which this disclosure pertains.
- the control unit 210 may control signal generation, mapping, etc.
- the control unit 210 may control transmission and reception using the transceiver unit 220 and the transceiver antenna 230, measurement, etc.
- the control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.
- the transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223.
- the baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212.
- the transceiver unit 220 may be composed of a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on a common understanding in the technical field to which the present disclosure relates.
- the transceiver unit 220 may be configured as an integrated transceiver unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222.
- the reception unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.
- the transmitting/receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.
- the transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc.
- the transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.
- the transceiver unit 220 may form at least one of the transmit beam and receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.
- digital beamforming e.g., precoding
- analog beamforming e.g., phase rotation
- the transceiver 220 may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on the data and control information acquired from the controller 210, and generate a bit string to be transmitted.
- RLC layer processing e.g., RLC retransmission control
- MAC layer processing e.g., HARQ retransmission control
- the transceiver 220 may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.
- Whether or not to apply DFT processing may be based on the settings of transform precoding.
- the transceiver unit 220 transmission processing unit 2211
- the transceiver unit 220 may perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, it is not necessary to perform DFT processing as the above-mentioned transmission processing.
- the transceiver unit 220 may perform modulation, filtering, amplification, etc., on the baseband signal to a radio frequency band, and transmit the radio frequency band signal via the transceiver antenna 230.
- the transceiver unit 220 may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transceiver antenna 230.
- the transceiver 220 may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.
- reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.
- the transceiver 220 may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal.
- the measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc.
- the measurement results may be output to the control unit 210.
- the measurement unit 223 may derive channel measurements for CSI calculation based on channel measurement resources.
- the channel measurement resources may be, for example, non-zero power (NZP) CSI-RS resources.
- the measurement unit 223 may derive interference measurements for CSI calculation based on interference measurement resources.
- the interference measurement resources may be at least one of NZP CSI-RS resources for interference measurement, CSI-Interference Measurement (IM) resources, etc.
- CSI-IM may be called CSI-Interference Management (IM) or may be interchangeably read as Zero Power (ZP) CSI-RS.
- CSI-RS, NZP CSI-RS, ZP CSI-RS, CSI-IM, CSI-SSB, etc. may be read as interchangeable.
- the transmitting unit and receiving unit of the user terminal 20 in this disclosure may be configured by at least one of the transmitting/receiving unit 220 and the transmitting/receiving antenna 230.
- the transceiver 220 may receive a Medium Access Control Element (MAC CE) related to cell switching.
- the MAC CE may include information regarding a TCI state pool of a serving cell or a candidate cell.
- the TCI state pool may be associated with at least one of a unified TCI state, a component carrier (CC) specific TCI pool, and a CC common pool.
- CC component carrier
- the control unit 210 may control the application of at least one of the settings of radio link monitoring (RLM), beam interference detection (BFD), and uplink control channel (PUCCH) to a specific cell based on the information included in the MAC CE.
- the control unit 210 may determine the settings to be applied based on the type of the candidate cell.
- the control unit 210 may apply the settings to some of the specific cells and ignore the settings to some other of the specific cells or not apply the settings until a specific condition is met. If the settings are not provided by higher layer signaling or if the settings for the candidate cell do not exist, the control unit 210 may derive a reference signal (RS) corresponding to the settings.
- RS reference signal
- each functional block may be realized using one device that is physically or logically coupled, or may be realized using two or more devices that are physically or logically separated and directly or indirectly connected (for example, using wires, wirelessly, etc.).
- the functional blocks may be realized by combining the one device or the multiple devices with software.
- the functions include, but are not limited to, judgement, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment.
- a functional block (component) that performs the transmission function may be called a transmitting unit, a transmitter, and the like. In either case, as mentioned above, there are no particular limitations on the method of realization.
- a base station, a user terminal, etc. in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure.
- FIG. 19 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment.
- the above-mentioned base station 10 and user terminal 20 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, etc.
- the hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figures, or may be configured to exclude some of the devices.
- processor 1001 may be implemented by one or more chips.
- the functions of the base station 10 and the user terminal 20 are realized, for example, by loading specific software (programs) onto hardware such as the processor 1001 and memory 1002, causing the processor 1001 to perform calculations, control communications via the communication device 1004, and control at least one of the reading and writing of data in the memory 1002 and storage 1003.
- the processor 1001 operates an operating system to control the entire computer.
- the processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, etc.
- CPU central processing unit
- control unit 110 210
- transmission/reception unit 120 220
- etc. may be realized by the processor 1001.
- the processor 1001 also reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
- the programs used are those that cause a computer to execute at least some of the operations described in the above embodiments.
- the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and similar implementations may be made for other functional blocks.
- Memory 1002 is a computer-readable recording medium and may be composed of at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other suitable storage media. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to one embodiment of the present disclosure.
- ROM Read Only Memory
- EPROM Erasable Programmable ROM
- EEPROM Electrically EPROM
- RAM Random Access Memory
- Memory 1002 may also be called a register, cache, main memory, etc.
- Memory 1002 can store executable programs (program codes), software modules, etc. for implementing a wireless communication method according to one embodiment of the present disclosure.
- Storage 1003 is a computer-readable recording medium and may be composed of at least one of a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, or other suitable storage medium.
- Storage 1003 may also be referred to as an auxiliary storage device.
- 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, for example, a network device, a network controller, a network card, a communication module, etc.
- the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD).
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- the above-mentioned transmitting/receiving unit 120 (220), transmitting/receiving antenna 130 (230), etc. may be realized by the communication device 1004.
- the transmitting/receiving unit 120 (220) may be implemented as a transmitting unit 120a (220a) and a receiving unit 120b (220b) that are physically or logically separated.
- the input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside.
- the output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one structure (e.g., a touch panel).
- each device such as the processor 1001 and 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 each device.
- the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using the hardware.
- the processor 1001 may be implemented using at least one of these pieces of hardware.
- a channel, a symbol, and a signal may be read as mutually interchangeable.
- a signal may also be a message.
- a reference signal may be abbreviated as RS, and may be called a pilot, a pilot signal, or the like depending on the applied standard.
- a component carrier may also be called a cell, a frequency carrier, a carrier frequency, or the like.
- a radio frame may be composed of one or more periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting a radio frame may be called a subframe.
- a subframe may be composed of one or more slots in the time domain.
- a subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.
- the numerology may be a communication parameter that is applied to at least one of the transmission and reception of a signal or channel.
- the numerology may indicate, for example, at least one of the following: SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame configuration, a specific filtering process performed by the transceiver in the frequency domain, a specific windowing process performed by the transceiver in the time domain, etc.
- SCS SubCarrier Spacing
- TTI Transmission Time Interval
- radio frame configuration a specific filtering process performed by the transceiver in the frequency domain
- a specific windowing process performed by the transceiver in the time domain etc.
- a slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.).
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may also be a time unit based on numerology.
- a slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A.
- a PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.
- a radio frame, subframe, slot, minislot, and symbol all represent time units when transmitting a signal.
- a different name may be used for radio frame, subframe, slot, minislot, and symbol. Note that the time units such as frame, subframe, slot, minislot, and symbol in this disclosure may be read as interchangeable.
- one subframe may be called a TTI
- multiple consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI.
- at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms.
- the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.
- TTI refers to, for example, the smallest time unit for scheduling in wireless communication.
- a base station schedules each user terminal by allocating radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) in TTI units.
- radio resources such as frequency bandwidth and transmission power that can be used by each user terminal
- the TTI may be a transmission time unit for a channel-coded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc.
- the time interval e.g., the number of symbols
- the time interval in which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.
- one or more TTIs may be the minimum time unit of scheduling.
- the number of slots (minislots) that constitute the minimum time unit of 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, etc.
- a TTI shorter than a normal TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.
- a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms
- a short TTI e.g., a shortened TTI, etc.
- TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain.
- the number of subcarriers included in an RB may be the same regardless of numerology, and may be, for example, 12.
- the number of subcarriers included in an RB may be determined based on numerology.
- an RB may include one or more symbols in the time domain and may be one slot, one minislot, one subframe, or one TTI in length.
- One TTI, one subframe, etc. may each be composed of one or more resource blocks.
- one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.
- PRB physical resource block
- SCG sub-carrier group
- REG resource element group
- PRB pair an RB pair, etc.
- a resource block may be composed of one or more resource elements (REs).
- REs resource elements
- one RE may be a radio resource area of one subcarrier and one symbol.
- a Bandwidth Part which may also be referred to as a partial bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by an index of the RB relative to a common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within the BWP.
- the BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL).
- BWP UL BWP
- BWP for DL DL BWP
- One or more 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, and symbols are merely examples.
- the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, as well as the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.
- the information, parameters, etc. described in this disclosure may be represented using absolute values, may be represented using relative values from a predetermined value, or may be represented using other corresponding information.
- a radio resource may be indicated by a predetermined index.
- the names used for parameters and the like in this disclosure are not limiting in any respect. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure.
- the various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and the various names assigned to these various channels and information elements are not limiting in any respect.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies.
- the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.
- information, signals, etc. may 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/output via multiple network nodes.
- Input/output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input/output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.
- a specific location e.g., memory
- Input/output information, signals, etc. may be overwritten, updated, or added to.
- Output information, signals, etc. may be deleted.
- Input information, signals, etc. may be transmitted to another device.
- the notification of information is not limited to the aspects/embodiments described in this disclosure, and may be performed using other methods.
- the notification of information in this disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals, or a combination of these.
- DCI Downlink Control Information
- UCI Uplink Control Information
- RRC Radio Resource Control
- MIB Master Information Block
- SIB System Information Block
- MAC Medium Access Control
- the physical layer signaling may be called Layer 1/Layer 2 (L1/L2) control information (L1/L2 control signal), L1 control information (L1 control signal), etc.
- the RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.
- the MAC signaling may be notified, for example, using a MAC Control Element (CE).
- CE MAC Control Element
- notification of specified information is not limited to explicit notification, but may be implicit (e.g., by not notifying the specified information or by notifying other information).
- the determination may be based on a value represented by a single bit (0 or 1), a Boolean value represented by true or false, or a comparison of numerical values (e.g., with a predetermined value).
- Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
- Software, instructions, information, etc. may also be transmitted and received via a transmission medium.
- a transmission medium For example, if the software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and/or wireless technologies (such as infrared, microwave, etc.), then at least one of these wired and wireless technologies is included within the definition of a transmission medium.
- wired technologies such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)
- wireless technologies such as infrared, microwave, etc.
- Network may refer to the devices included in the network (e.g., base stations).
- the antenna port may be interchangeably read as an antenna port for any signal/channel (e.g., a demodulation reference signal (DMRS) port).
- the resource may be interchangeably read as a resource for any signal/channel (e.g., a reference signal resource, an SRS resource, etc.).
- the resource may include time/frequency/code/space/power resources.
- the spatial domain transmission filter may include at least one of a spatial domain transmission filter and a spatial domain reception filter.
- the above groups may include, for example, at least one of a spatial relationship group, a Code Division Multiplexing (CDM) group, a Reference Signal (RS) group, a Control Resource Set (CORESET) group, a PUCCH group, an antenna port group (e.g., a DMRS port group), a layer group, a resource group, a beam group, an antenna group, a panel group, etc.
- CDM Code Division Multiplexing
- RS Reference Signal
- CORESET Control Resource Set
- beam SRS Resource Indicator (SRI), CORESET, CORESET pool, PDSCH, PUSCH, codeword (CW), transport block (TB), RS, etc. may be read as interchangeable.
- SRI SRS Resource Indicator
- CORESET CORESET pool
- PDSCH PUSCH
- codeword CW
- TB transport block
- RS etc.
- TCI state downlink TCI state
- DL TCI state downlink TCI state
- UL TCI state uplink TCI state
- unified TCI state common TCI state
- joint TCI state etc.
- QCL QCL
- QCL assumptions QCL relationship
- QCL type information QCL property/properties
- specific QCL type e.g., Type A, Type D
- specific QCL type e.g., Type A, Type D
- index identifier
- indicator indication, resource ID, etc.
- sequence list, set, group, cluster, subset, etc.
- TCI state ID the spatial relationship information identifier
- TCI state ID the spatial relationship information
- TCI state the spatial relationship information
- TCI state the spatial relationship information
- TCI state the spatial relationship information
- Base Station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.
- a base station can accommodate one or more (e.g., three) cells.
- a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))).
- RRH Remote Radio Head
- the term "cell” or “sector” refers to a part or the entire coverage area of at least one of the base station and base station subsystems that provide communication services in this coverage.
- a base station transmitting information to a terminal may be interpreted as the base station instructing the terminal to control/operate based on the information.
- MS Mobile Station
- UE User Equipment
- a mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc.
- at least one of the base station and the mobile station may be a device mounted on a moving object, the moving object itself, etc.
- the moving body in question refers to an object that can move, and the moving speed is arbitrary, and of course includes the case where the moving body is stationary.
- the moving body in question includes, but is not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, artificial satellites, drones, multicopters, quadcopters, balloons, and objects mounted on these.
- the moving body in question may also be a moving body that moves autonomously based on an operating command.
- the moving object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned).
- a vehicle e.g., a car, an airplane, etc.
- an unmanned moving object e.g., a drone, an autonomous vehicle, etc.
- a robot manned or unmanned
- at least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations.
- at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- FIG. 20 is a diagram showing an example of a vehicle according to an embodiment.
- the vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.
- various sensors including a current sensor 50, an RPM sensor 51, an air pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58
- an information service unit 59 including a communication module 60.
- the drive unit 41 is composed of at least one of an engine, a motor, and a hybrid of an engine and a motor, for example.
- the steering unit 42 includes at least a steering wheel (also called a handlebar), and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.
- the electronic control unit 49 is composed of a microprocessor 61, memory (ROM, RAM) 62, and a communication port (e.g., an Input/Output (IO) port) 63. Signals are input to the electronic control unit 49 from various sensors 50-58 provided in the vehicle.
- the electronic control unit 49 may also be called an Electronic Control Unit (ECU).
- ECU Electronic Control Unit
- Signals from the various sensors 50-58 include a current signal from a current sensor 50 that senses the motor current, a rotation speed signal of the front wheels 46/rear wheels 47 acquired by a rotation speed sensor 51, an air pressure signal of the front wheels 46/rear wheels 47 acquired by an air pressure sensor 52, a vehicle speed signal acquired by a vehicle speed sensor 53, an acceleration signal acquired by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 acquired by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 acquired by a brake pedal sensor 56, an operation signal of the shift lever 45 acquired by a shift lever sensor 57, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 58.
- the information service unit 59 is composed of various devices, such as a car navigation system, audio system, speakers, displays, televisions, and radios, for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs that control these devices.
- the information service unit 59 uses information acquired from external devices via the communication module 60, etc., to provide various information/services (e.g., multimedia information/multimedia services) to the occupants of the vehicle 40.
- various information/services e.g., multimedia information/multimedia services
- the information service unit 59 may include input devices (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accept input from the outside, and may also include output devices (e.g., a display, a speaker, an LED lamp, a touch panel, etc.) that perform output to the outside.
- input devices e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.
- output devices e.g., a display, a speaker, an LED lamp, a touch panel, etc.
- the driving assistance system unit 64 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving load, such as a millimeter wave radar, a Light Detection and Ranging (LiDAR), a camera, a positioning locator (e.g., a Global Navigation Satellite System (GNSS)), map information (e.g., a High Definition (HD) map, an Autonomous Vehicle (AV) map, etc.), a gyro system (e.g., an Inertial Measurement Unit (IMU), an Inertial Navigation System (INS), etc.), an Artificial Intelligence (AI) chip, and an AI processor, and one or more ECUs that control these devices.
- the driving assistance system unit 64 also transmits and receives various information via the communication module 60 to realize a driving assistance function or an autonomous driving function.
- the communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63.
- the communication module 60 transmits and receives data (information) via the communication port 63 between the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58 that are provided on the vehicle 40.
- the communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication.
- the communication module 60 may be located either inside or outside the electronic control unit 49.
- the external device may be, for example, the above-mentioned base station 10 or user terminal 20.
- the communication module 60 may also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it may function as at least one of the base station 10 and user terminal 20).
- the communication module 60 may transmit at least one of the signals from the various sensors 50-58 described above input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication.
- the electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may be referred to as input units that accept input.
- the PUSCH transmitted by the communication module 60 may include information based on the above input.
- the communication module 60 receives various information (traffic information, signal information, vehicle distance information, etc.) transmitted from an external device and displays it on an information service unit 59 provided in the vehicle.
- the information service unit 59 may also be called an output unit that outputs information (for example, outputs information to a device such as a display or speaker based on the PDSCH (or data/information decoded from the PDSCH) received by the communication module 60).
- the communication module 60 also stores various information received from external devices in memory 62 that can be used by the microprocessor 61. Based on the information stored in memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axles 48, various sensors 50-58, and the like provided on the vehicle 40.
- the base station in the present disclosure may be read as a user terminal.
- each aspect/embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- the user terminal 20 may be configured to have the functions of the base station 10 described above.
- terms such as "uplink” and "downlink” may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink").
- the uplink channel, downlink channel, etc. may be read as the sidelink channel.
- the user terminal in this disclosure may be interpreted as a base station.
- the base station 10 may be configured to have the functions of the user terminal 20 described above.
- operations that are described as being performed by a base station may in some cases be performed by its upper node.
- a network that includes one or more network nodes having base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) or a Serving-Gateway (S-GW)), or a combination of these.
- MME Mobility Management Entity
- S-GW Serving-Gateway
- each aspect/embodiment described in this disclosure may be used alone, in combination, or switched between depending on the implementation.
- the processing procedures, sequences, flow charts, etc. of each aspect/embodiment described in this disclosure may be rearranged as long as there is no inconsistency.
- the methods described in this disclosure present elements of various steps in an exemplary order, and are not limited to the particular order presented.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- LTE-B LTE-Beyond
- SUPER 3G IMT-Advanced
- 4th generation mobile communication system 4th generation mobile communication system
- 5G 5th generation mobile communication system
- 6G 6th generation mobile communication system
- xG x is, for example, an integer or decimal
- Future Radio Access FX
- GSM Global System for Mobile communications
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi
- IEEE 802.16 WiMAX (registered trademark)
- IEEE 802.20 Ultra-Wide Band (UWB), Bluetooth (registered trademark), and other appropriate wireless communication methods, as well as next-generation systems that are expanded, modified, created
- the phrase “based on” does not mean “based only on,” unless expressly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- any reference to an element using a designation such as "first,” “second,” etc., 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, a reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.
- determining may encompass a wide variety of actions. For example, “determining” may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking in a table, database, or other data structure), ascertaining, etc.
- Determining may also be considered to mean “determining” receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.
- judgment (decision) may be considered to mean “judging (deciding)” resolving, selecting, choosing, establishing, comparing, etc.
- judgment (decision) may be considered to mean “judging (deciding)” some kind of action.
- judgment (decision) may be read as interchangeably with the actions described above.
- expect may be read as “be expected”.
- "expect(s) " ("" may be expressed, for example, as a that clause, a to infinitive, etc.) may be read as “be expected !.
- "does not expect " may be read as "be not expected ".
- "An apparatus A is not expected " may be read as "An apparatus B other than apparatus A does not expect " (for example, if apparatus A is a UE, apparatus B may be a base station).
- the "maximum transmit power" referred to in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.
- connection refers to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other.
- the coupling or connection between the elements may be physical, logical, or a combination thereof. For example, “connected” may be read as "access.”
- a and B are different may mean “A and B are different from each other.”
- the term may also mean “A and B are each different from C.”
- Terms such as “separate” and “combined” may also be interpreted in the same way as “different.”
- timing, time, duration, time instance, any time unit e.g., slot, subslot, symbol, subframe
- period occasion, resource, etc.
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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)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UL送信を行うことが検討されている。
NRでは、1つ又は複数の送受信ポイント(Transmission/Reception Point(TRP))(マルチTRP(Multi-TRP(MTRP)))が、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UL送信を行うことが検討されている。
シナリオ1は、例えば、マルチTRPのセル間モビリティに対応する。なお、シナリオ1は、マルチTRPのセル間モビリティに対応しないシナリオであってもよい。シナリオ1では、例えば、以下の手順が行われる。
(2)UEは、異なるPCIに対応する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に対応するTRPに関連付けられた送信設定指示(Transmission Configuration Indication(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に対応する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(又は、L3モビリティ手順を行わず)に、追加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(サービングセルの想定)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。
L1/L2セル間モビリティにおいて、サービングセルに加えて、候補セルが設定されてもよい。本開示において、候補セルは、ターゲットセル、追加セル、追加PCIと読み替えられてもよい。1以上の候補セル(又は、候補セルグループ)が、各サービングセルに別々に関連付けられてもよいし、1以上の候補セル(又は、候補セルグループ)が、複数のサービングセルに共通に関連づけられてもよい。
設定例1は、各サービングセル(又は、各サービングセルにそれぞれ対応する周波数領域)に対して、1以上の候補セルがそれぞれ関連付けられる/設定される(図4参照)。ここでは、SpCell#0(又は、SpCell#0に対応する周波数領域)に対して候補セル#0-1、#0-2、#0-3が関連付けられ、SCell#1(又は、SCell#1に対応する周波数領域)に対して候補セル#1-1が関連付けられ、SCell#2(又は、SpCell#2に対応する周波数領域)に対して候補セル#2-1、#2-2が関連づけられる場合を示している。当該関連づけに関する情報は、RRC/MAC CE/DCIにより基地局からUEに設定/指示されてもよい。
設定例2は、MACエンティティ/MCG/SCGに対して、候補セルが関連付けられる/設定される(図4参照)。ここでは、MACエンティティ/MCG/SCGに対して、候補セル#3-#8が関連付けられる場合を示している。この場合、各サービングセルに対して候補セルが関連付けられるのではなく、MACエンティティ又はセルグループ(例えば、MCG/SCG)に対して候補セルが設定される。各セルに設定される候補セルに関する情報は、RRC/MAC CE/DCIにより基地局からUEに設定/指示されてもよい。
設定例3では、1以上の候補セルグループが設定される(図4参照)。候補セルグループは、1以上の候補セルを有している。ここでは、候補セル#0-#2を有する候補セルグループ#1、候補セル#0、#1を有する候補セルグループ#2、候補セル#0を有する候補セルグループ#3が設定される場合を示している。設定される候補セルグループに関する情報及び各候補セルグループに含まれる候補セルに関する情報の少なくとも一つ、RRC/MAC CE/DCIにより基地局からUEに設定/指示されてもよい。
既存システム(例えば、Rel.17)では、追加PCI(又は、追加セル)のTCI状態に関するL1ビーム指示(例えば、DCIのTCI状態フィールドによる指示)がサポートされる。
Rel.18以降において、L1/L2によるトリガを利用したモビリティ(L1L2-triggered mobility(LTM))がサポートされることが想定される。
NRにおいて、無線リンクモニタリング(Radio Link Monitoring(RLM))が利用される。
もし、UEがRLM-RS(例えば、上位レイヤパラメータのRadioLinkMonitoringRS)を提供されず、且つUEがPDCCH受信用に1以上のCSI-RSを含むTCI状態を提供された場合、UEは、以下の手順1から4に従う。
もしPDCCH受信用のアクティブTCI状態が1つのRSのみを含む場合、UEは、PDCCH受信用のアクティブTCI状態用に提供されたそのRSをRLMに用いる。
[[手順2]]
もしPDCCH受信用のアクティブTCI状態が2つのRSを含む場合、UEは、1つのRSがQCLタイプDを有すると想定し、UEは、QCLタイプDを有するそのRSをRLMに用いる。UEは、両方のRSがQCLタイプDを有すると想定しない。
[[手順3]]
UEは、非周期的(aperiodic)又はセミパーシステント(semi-persistent)のRSをRLMに用いることを要求されない。
[[手順4]]
Lmax=4に対して、UEは、最小のモニタリング周期(periodicity)からの順に、複数のサーチスペースセットに関連付けられた複数のCORESET内において、PDCCH受信用のアクティブTCI状態用に提供されたNRLM個のRSを選択する。もし1より多いCORESETが、同じモニタリング周期を有する複数のサーチスペースセットに関連付けられている場合、UEは、最高のCORESETインデックスからのCORESETの順を決定する。
NRでは、ビームフォーミングを利用して通信を行う。例えば、UE及び基地局(例えば、gNB(gNodeB))は、信号の送信に用いられるビーム(送信ビーム、Txビームなどともいう)、信号の受信に用いられるビーム(受信ビーム、Rxビームなどともいう)を用いてもよい。
BFが検出された場合、UEから、PCell/PSCellに対して、PUCCH-BFR(スケジューリング要求(SR))が送信されてもよい。次いで、PCell/PSCellから、UEに対して、下記ステップ2のためのULグラント(DCI)が送信されてもよい。ビーム障害が検出された場合に、新候補ビームに関する情報を送信するためのMAC CE(又は、UL-SCH)が存在する場合には、ステップ1(例えば、PUCCH送信)を省略して、ステップ2(例えば、MAC CE送信)を行ってもよい。
次いで、UEは、ビーム障害が検出された(失敗した)セルに関する情報(例えば、セルインデックス)及び新候補ビームに関する情報を、MAC CEを用いて、上りリンクチャネル(例えば、PUSCH)を介して、基地局(PCell/PSCell)に送信してもよい。その後、BFR手順を経て、基地局からの応答信号を受信してから所定期間(例えば、28シンボル)後に、PDCCH/PUCCH/PDSCH/PUSCHのQCLが、新たなビームに更新されてもよい。
Rel.16において、1つのサービングセルの各BWPに対し、UEは、障害検出リソース(failureDetectionResources、failureDetectionResourcesToAddModList、RadioLinkMonitoringConfig)によって周期的(P)-CSI-RSリソース設定インデックスのセットq0バーと、候補ビームRSリスト(candidateBeamRSList)又は拡張候補ビームRSリスト(candidateBeamRSListExt-r16)又はSCell用候補ビームRSリスト(candidateBeamRSSCellList-r16)によって、P-CSI-RSリソース設定インデックス及びSS/PBCHブロックインデックスの少なくとも1つのセットq1バーと、を提供されることができる。
UEは、PUCCH送信に用いられるパラメータ(PUCCH設定情報、すなわちPUCCH-Config)を設定されてもよい。図12は、UE固有のUL BWPの設定(上位レイヤパラメータ(BWP-UplinkDedicated)に含まれるPUCCH設定(例えば、IE PUCCH-Config)の一部を示している。
上述したようにLTMの候補セル設定において、IE CellGroupConfigの必要性が検討されている。また、将来的には、RRC再設定を伴わない候補セル間の連続的なL1/L2セル切り替え(変更)のサポートが求められる。
・SpCellのみのRLM/RLF設定、
・SpCellのみのBFD/BFR設定とSCellのみのBFD/BFR設定(つまり、SpCellとSCellとでBFD/BFR設定が異なる)、
・PUCCH SCell(PUCCH-ConfigによってPUCCHと伴って設定されるSCell)の設定。
本開示において、「A/B」及び「A及びBの少なくとも一方」は、互いに読み替えられてもよい。また、本開示において、「A/B/C」は、「A、B及びCの少なくとも1つ」を意味してもよい。
<第1の実施形態>
第1の実施形態は、RLM設定に関する。図13は、第1の実施の形態に係るUE動作の一例を示す図である。
各候補セルは、RLM設定を伴って(によって)設定されうる。すなわち、RLM設定は、各候補セルに対して設定されてもよい。RLM設定は、各LTM候補セル設定のための上位レイヤパラメータ(IE CellGroupConfig)に含まれてよい。
RLM設定は、参照設定(reference configuration)において設定されてもよい。つまり、当該RLM設定は、どの候補セルに対しても適用されてよい。例えば、SpCell又はセルグループの切り替えのためにセル切り替えコマンド用MAC CEが送信された場合、UEは、RLM設定を新しいSpCellに適用する。すなわち、UEは、SpCell又はセルグループの切り替えのためのセル切り替えコマンド(MAC CE)を受信した場合、SpCellに対応するRLM設定を適用してもよい(図13参照)。
RRCによってLTM候補セルに対するRLM設定を提供しないことが許可されてもよい。この場合、UEは、暗黙的にRLM-RSを導出してもよい。RLM-RSの導出方法として以下のオプション3-1~3-2が挙げられる。
SpCell又はセルグループの切り替えのためにセル切り替えコマンド用MAC CEが送信された場合、ターゲットSpCellのビーム/TCI状態が当該セル切り替えコマンドによって送信されることになる。すなわち、セル切り替えコマンド(MAC CE)には、ターゲットSpCell(新しいSpCell)に対するビーム/TCI状態を指示する情報が含まれてよい。
セル切り替えコマンド用MAC CEによってセル切り替えが行われた後、UEは新しいSpCellに対して既存のルールに基づいてRLM-RSを導出する。
第2の実施形態は、BFD設定に関する。図14は、第2の実施の形態に係るUE動作の一例を示す図である。第2の実施形態は、第1の実施形態のRLMをBFDに読み替えて適用することができる。
各候補セルは、BFD設定を伴って(によって)設定されうる。すなわち、BFD設定は、各候補セルに対して設定されてもよい。BFD設定は、各LTM候補セル設定のための上位レイヤパラメータ(IE CellGroupConfig)に含まれてよい。当該BFD設定に関するパラメータは、例えば、上述したspCell-BFR-CBRA-r16を含んでよい。
BFD設定は、参照設定(reference configuration)において設定されてもよい。つまり、当該BFD設定は、どの候補セルに対しても適用されてよい。例えば、SpCell又はセルグループの切り替えのためにセル切り替えコマンド用MAC CEが送信された場合、UEは、新しいSpCell及び新しいSCellに対してBFD設定を適用する。すなわち、UEは、SpCell又はセルグループの切り替えのためのセル切り替えコマンド(MAC CE)を受信した場合、SpCell及びSCellにそれぞれ対応するBFD設定を適用してもよい(図14参照)。なお、SpCell BFRのパラメータは、新しいSpCellにのみ適用されることが想定されてよい。
SpCell BFRのパラメータを除くBFD設定は各候補セルに対して設定されてよい。一方で、SpCell BFRのパラメータは、参照設定において設定されてよい。すなわち、特定のセルに対するBFRのパラメータは、他のパラメータ(BFD設定)と別々に設定されてもよい。
もしLTM候補セルに対するBFD設定が存在しない場合、UEは、暗黙的にBFD-RSを導出してもよい。BFD-RSの導出方法として以下のオプション3-1~3-2が挙げられる。
SpCell又はセルグループの切り替えのためにセル切り替えコマンド用MAC CEが送信された場合、ターゲットSpCellのビーム/TCI状態が当該セル切り替えコマンドによって送信されることになる。すなわち、セル切り替えコマンド(MAC CE)には、ターゲットSpCell(新しいSpCell)に対するビーム/TCI状態を指示する情報が含まれてよい。
セル切り替えコマンド用MAC CEによってセル切り替えが行われた後、UEは新しいSCellごとに、既存のルールに基づいてBFD-RSを導出する。
第1の実施形態は、PUCCH設定(PUCCH-Config)に関する。図15は、第3の実施の形態に係るUE動作の一例を示す図である。第3の実施形態は、第1の実施形態のRLM/第2の実施形態のBFDをPUCCHに読み替えて適用することができる。PUCCH設定、PUCCH-Configの設定、及びPUCCH-Configは、互いに読み替えられてよい。
各候補セルは、PUCCH-Configの設定(PUCCH設定)を伴って(によって)設定されうる。すなわち、PUCCH-Configの設定は、各候補セルに対して設定されてもよい。PUCCH-Configの設定は、各LTM候補セル設定のための上位レイヤパラメータ(IE CellGroupConfig)に含まれてよい。
既存のPUCCH SCellは、もはやPUCCH SCellではない。セル切り替え後、NWが新しいPUCCH SCellを設定/指示するまで、PUCCH SCellは存在しない。すなわち、UEは、NWから新しいPUCCH SCellに対応する設定/指示を受信するまで、PUCCH SCellが存在しないと想定してもよい。
既存のPUCCH SCellは、変更されない。すなわち、UEは、PUCCH SCellに関する設定を変更せずにそのまま適用してもよい。
UEは、それぞれの新しいSCellに対するPUCCH-Configの設定を無視してもよい。
NWが、上位レイヤシグナリング/物理レイヤシグナリングによって最大1つのSCellを新しいPUCCH SCellとして設定/指示するまで(設定/指示しない限り)、UEは、それぞれの新しいSCellに対するPUCCH-Configの設定を無視してもよい。この場合、セル切り替えコマンド(MAC CE)により、PUCCH SCellとして1つの候補セルインデックスが追加で指示される可能性がある。
UEは、事前定義された(予め仕様で規定された)ルールに基づいて、ある1つのSCellをPUCCH SCellとして選択してもよい。例えば、その選択ルールとして、選択され得るSCellは、例えばセルIDが最も小さい新しいSCellであってもよい。このような選択ルールを適用するかどうかは、新たなパラメータ(例えば後述の参照設定)によって設定されてもよい。
<オプション2>
PUCCH-Configの設定は、参照設定(reference configuration)において設定されてもよい。つまり、当該PUCCH-Configの設定は、どの候補セルに対しても適用されてよい。例えば、SpCell又はセルグループの切り替えのためにセル切り替えコマンド用MAC CEが送信された場合、UEは、PUCCH-Configの設定を新しいSpCellに適用する。すなわち、UEは、SpCell又はセルグループの切り替えのためのセル切り替えコマンド(MAC CE)を受信した場合、SpCellに対応するPUCCH-Configの設定を適用してもよい(図15参照)。
既存のPUCCH SCellは、もはやPUCCH SCellではない。セル切り替え後、NWが新しいPUCCH SCellを設定/指示するまで、PUCCH SCellは存在しない。すなわち、UEは、NWから新しいPUCCH SCellに対応する設定/指示を受信するまで、PUCCH SCellが存在しないと想定してもよい。
既存のPUCCH SCellは、変更されない。すなわち、UEは、PUCCH SCellに関する設定を変更せずにそのまま適用してもよい。
UEは、それぞれの新しいSCellに対するPUCCH-Configの設定を無視してもよい。
NWが、上位レイヤシグナリング/物理レイヤシグナリングによって最大1つのSCellを新しいPUCCH SCellとして設定/指示するまで(設定/指示しない限り)、UEは、それぞれの新しいSCellに対するPUCCH-Configの設定を無視してもよい。この場合、セル切り替えコマンド(MAC CE)により、PUCCH SCellとして1つの候補セルインデックスが追加で指示される可能性がある。
UEは、事前定義された(予め仕様で規定された)ルールに基づいて、ある1つのSCellをPUCCH SCellとして選択してもよい。例えば、その選択ルールとして、選択され得るSCellは、例えばセルIDが最も小さい新しいSCellであってもよい。このような選択ルールを適用するかどうかは、新たなパラメータ(例えば参照設定)によって設定されてもよい。
[UEへの情報の通知]
上述の実施形態における(ネットワーク(Network(NW))(例えば、基地局(Base Station(BS)))から)UEへの任意の情報の通知(言い換えると、UEにおけるBSからの任意の情報の受信)は、物理レイヤシグナリング(例えば、DCI)、上位レイヤシグナリング(例えば、RRCシグナリング、MAC CE)、特定の信号/チャネル(例えば、PDCCH、PDSCH、参照信号)、又はこれらの組み合わせを用いて行われてもよい。
上述の実施形態におけるUEから(NWへ)の任意の情報の通知(言い換えると、UEにおけるBSへの任意の情報の送信/報告)は、物理レイヤシグナリング(例えば、UCI)、上位レイヤシグナリング(例えば、RRCシグナリング、MAC CE)、特定の信号/チャネル(例えば、PUCCH、PUSCH、PRACH、参照信号)、又はこれらの組み合わせを用いて行われてもよい。
上述の実施形態の少なくとも1つは、特定の条件を満たす場合に適用されてもよい。当該特定の条件は、規格において規定されてもよいし、上位レイヤシグナリング/物理レイヤシグナリングを用いてUE/BSに通知されてもよい。
・上記実施形態の少なくとも1つについての特定の処理/動作/制御/情報をサポートすること。
・L1/L2セル内モビリティ/L1/L2セル間モビリティをサポートすること。
・セル内/セル間マルチTRPにおけるTRPごとのTAをサポートすること。
・サービングセル/非サービングセルに対してセル内マルチTRP/セル間マルチTRPの設定をサポートすること。
・候補セルに対するRLM-RSの設定(RLM設定)をサポートすること。
・候補セルに対するRFD-RSの設定(RFD設定)をサポートすること。
・候補セルに対するPUCCH-Configの設定(PUCCH設定)をサポートすること。
本開示の一実施形態に関して、以下の発明を付記する。
[付記1]
セル切り替えに関するMedium Access Control Control Element(MAC CE)を受信する受信部と、
前記MAC CEに含まれる情報に基づいて、特定セルに対する無線リンクモニタリング(RLM)、ビーム障害検出(BFD)、及び上りリンク制御チャネル(PUCCH)の少なくとも1つの設定の適用を制御する制御部と、を有する、端末。
[付記2]
前記制御部は、候補セルの種別に基づいて、適用する前記設定を判断する、付記1に記載の端末。
[付記3]
前記制御部は、特定のセルのうち一部のセルに対して前記設定を適用し、前記特定のセルうち他の一部のセルに対して前記設定を無視する又は特定の条件が満たされるまで前記設定を適用しない、付記1又は付記2に記載の端末。
[付記4]
上位レイヤシグナリングによって前記設定が提供されない場合、又は候補セルに対する前記設定が存在しない場合、前記制御部は、前記設定に対応する参照信号(RS)を導出する、付記1から付記3のいずれかに記載の端末。
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17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18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)
- セル切り替えに関するMedium Access Control Control Element(MAC CE)を受信する受信部と、
前記MAC CEに含まれる情報に基づいて、特定セルに対する無線リンクモニタリング(RLM)、ビーム障害検出(BFD)、及び上りリンク制御チャネル(PUCCH)の少なくとも1つの設定の適用を制御する制御部と、を有する、端末。 - 前記制御部は、候補セルの種別に基づいて、適用する前記設定を判断する、請求項1に記載の端末。
- 前記制御部は、特定のセルのうち一部のセルに対して前記設定を適用し、前記特定のセルうち他の一部のセルに対して前記設定を無視する又は特定の条件が満たされるまで前記設定を適用しない、請求項1に記載の端末。
- 上位レイヤシグナリングによって前記設定が提供されない場合、又は候補セルに対する前記設定が存在しない場合、前記制御部は、前記設定に対応する参照信号(RS)を導出する、請求項1に記載の端末。
- セル切り替えに関するMedium Access Control Control Element(MAC CE)を受信するステップと、
前記MAC CEに含まれる情報に基づいて、特定セルに対する無線リンクモニタリング(RLM)、ビーム障害検出(BFD)、及び上りリンク制御チャネル(PUCCH)の少なくとも1つの設定の適用を制御するステップと、を有する、端末の無線通信方法。 - セル切り替えに関するMedium Access Control Control Element(MAC CE)を送信する送信部と、
前記MAC CEに含まれる情報に基づいて、特定セルに対する無線リンクモニタリング(RLM)、ビーム障害検出(BFD)、及び上りリンク制御チャネル(PUCCH)の少なくとも1つの設定の適用を端末が判断するための情報の生成を制御する制御部と、を有する、基地局。
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| "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTR_AN); Overall description; Stage 2 (Release 8", 3GPP TS 36.300 V8.12.0, April 2010 (2010-04-01) |
| INTERDIGITAL, INC.: "LTM cell switch MAC CE and triggering.", 3GPP DRAFT; R2-2303712, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. 3GPP RAN 2, no. Online; 20230417 - 20230426, 6 April 2023 (2023-04-06), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052365971 * |
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| XIN YOU, OPPO: "Discussion on partial MAC reset for LTM", 3GPP DRAFT; R2-2300381; TYPE DISCUSSION; NR_MOB_ENH2-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Athens, GR; 20230227 - 20230303, 17 February 2023 (2023-02-17), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052245028 * |
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