WO2022064715A1 - 端末及び基地局 - Google Patents
端末及び基地局 Download PDFInfo
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- WO2022064715A1 WO2022064715A1 PCT/JP2020/036719 JP2020036719W WO2022064715A1 WO 2022064715 A1 WO2022064715 A1 WO 2022064715A1 JP 2020036719 W JP2020036719 W JP 2020036719W WO 2022064715 A1 WO2022064715 A1 WO 2022064715A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
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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
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00833—Handover statistics
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00837—Determination of triggering parameters for hand-off
- H04W36/008375—Determination of triggering parameters for hand-off based on historical data
Definitions
- This disclosure relates to terminals and base stations for appropriately collecting the movement history of UEs on the SN side.
- the 3rd Generation Partnership Project (3GPP) specifies the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and next-generation specifications called Beyond 5G, 5G Evolution or 6G. We are also proceeding with the conversion.
- 5G New Radio
- NG Next Generation
- MR-DC Multi-RAT Dual Connectivity
- MCG Master Cell Group
- SCG Secondary Cell Group
- MR-DC include EN-DC (E-UTRA-NR Dual Connectivity), NE-DC (NR-EUTRA Dual Connectivity) and NR-DC (NR-NR Dual Connectivity).
- Patent Document 1 For the purpose of SON (Self Organizing Network) and MDT (Minimization of Drive Test), data collection of UE (User Equipment) history information (UE History Information) in EN-DC is being considered (for example, non-).
- UE User Equipment
- UE History Information UE History Information
- an object is to provide a terminal and a base station that can appropriately collect the movement history of the UE on the SN side.
- One aspect of the present disclosure is to set an information element related to the cell before the change as a variable when the cell included in the second cell group is changed in the dual connectivity using the first cell group and the second cell group. It is a terminal including a control unit for transmitting a message and a transmission unit for transmitting a message including the information element set as the variable to the network.
- One aspect of the present disclosure is the first cell group and the second cell group when one of the first cell group and the second cell group is managed in the dual connectivity using the first cell group and the second cell group. It is a base station provided with a transmission unit for transmitting a message including an information element indicating a change history of cells included in the second cell group to a node that manages either one of the cell groups.
- FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10.
- FIG. 2 is a functional block configuration diagram of the UE 200.
- FIG. 3 is a diagram for explaining a usage scene.
- FIG. 4 is a sequence diagram showing an operation example 1.
- FIG. 5 is a diagram showing an example of UEInformationResponse (ASN.1 format).
- FIG. 6 is a diagram showing an example of VisitedCellInfoListNR (ASN.1 format).
- FIG. 7 is a sequence diagram showing an operation example 2.
- FIG. 8 is a diagram showing an example of UEAssistanceInformation (ASN.1 format).
- FIG. 9 is a sequence diagram showing an operation example 3.
- FIG. 10 is a diagram showing an example of ULInformationTransferMRDC (ASN.1 format).
- FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10.
- FIG. 2 is a functional block configuration diagram of the UE 200.
- FIG. 3 is a diagram for explaining
- FIG. 11 is a sequence diagram showing an operation example 4.
- FIG. 12 is a diagram showing an example of VisitedCellInfoListEN-DC (ASN.1 format).
- FIG. 13 is a diagram showing an example of VisitedCellInfoListEN-DC (ASN.1 format).
- FIG. 14 is a sequence diagram showing an operation example according to the modification example 2.
- FIG. 15 is a sequence diagram showing an operation example according to the modification example 2.
- FIG. 16 is a sequence diagram showing an operation example according to the modification example 2.
- FIG. 17 is a diagram showing an example of the hardware configuration of the UE 200.
- FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10 according to the embodiment.
- the wireless communication system 10 is a wireless communication system according to Long Term Evolution (LTE) and 5G New Radio (NR).
- LTE Long Term Evolution
- NR 5G New Radio
- LTE Long Term Evolution
- 4G Long Term Evolution
- 5G 5G New Radio
- LTE and NR may be interpreted as radio access technology (RAT), and in embodiments, LTE may be referred to as first radio access technology and NR may be referred to as second radio access technology. ..
- the wireless communication system 10 includes Evolved Universal Terrestrial Radio Access Network 20 (hereinafter, E-UTRAN20) and Next Generation-Radio Access Network 30 (hereinafter, NG RAN30). Further, the wireless communication system 10 includes a terminal 200 (hereinafter, UE200, User Equipment).
- E-UTRAN20 Evolved Universal Terrestrial Radio Access Network 20
- NG RAN30 Next Generation-Radio Access Network 30
- UE200 User Equipment
- E-UTRAN20 includes eNB100A, which is a base station that complies with LTE.
- NG RAN30 includes gNB100B, which is a base station according to 5G (NR).
- the eNB100A, gNB100B and UE200 can support carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC) that communicates between the UE and each of multiple Nodes at the same time.
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- E-UTRAN20 is connected to the core network 40 for LTE.
- the E-UTRAN20, NGRAN30 and the core network 40 may be simply referred to as a network.
- a management server 50 (hereinafter referred to as OAM server 50; Operation Administration and Management server) may be provided in the core network 40.
- the OAM server 50 may execute processing related to SON (Self Organizing Network), MDT (Minimization of Drive Test), and the like.
- the eNB100A and gNB100B can form an area (which may be expressed as a cell) in which wireless communication with the UE200 can be performed, specifically, an area A1 or an area A2.
- area A1 may be interpreted as an area where UE200 can communicate with eNB100A.
- Area A2 may be interpreted as an area where UE200 can communicate with gNB100B.
- Area A1 and area A2 may overlap each other, and in the area where area A1 and area A2 overlap, UE200 communicates with eNB100A and gNB100B at the same time as EN-DC (E-UTRA-NR Dual Connectivity) or NE-.
- DC NR-EUTRA Dual Connectivity
- the base station capable of communicating with the UE200 in the area A1 is the eNB100A, but the base station capable of communicating with the UE200 in the area A1 may be the gNB100B provided in the NG RAN30. good.
- NR-DC NR-NR Dual Connectivity
- the UE200 communicates at the same time as two or more gNB100Bs (or cells) may be performed.
- a group of cells capable of executing processing related to the C-plane (control plane) and the U-plane (user plane) may be referred to as a first cell group (MCG; Master Cell Group). ..
- a group of cells that can execute a process related to a U-plane (userplane) may be referred to as a second cell group (SCG; SecondaryCellGroup).
- SCG SecondaryCellGroup
- the eNB100A may be referred to as MN (MasterNode)
- the gNB100B may be referred to as SN (SecondaryNode).
- eNB100A may be referred to as SN and gNB100B may be referred to as MN.
- EN-DC, NE-DC and NR-DC may be collectively referred to as MR (Multi-RAT) -DC.
- FIG. 2 is a functional block configuration diagram of the UE200.
- the UE 200 includes a radio signal transmission / reception unit 210, an amplifier unit 220, a modulation / demodulation unit 230, a control signal / reference signal processing unit 240, a coding / decoding unit 250, a data transmission / reception unit 260, and a control unit 270. ..
- the wireless signal transmission / reception unit 210 transmits / receives a wireless signal according to LTE or NR.
- the wireless signal transmission / reception unit 210 corresponds to Massive MIMO, CA and DC in which a plurality of CCs are bundled and used.
- the amplifier unit 220 is composed of PA (Power Amplifier) / LNA (Low Noise Amplifier) and the like.
- the amplifier unit 220 amplifies the signal output from the modulation / demodulation unit 230 to a predetermined power level. Further, the amplifier unit 220 amplifies the RF signal output from the radio signal transmission / reception unit 210.
- the modulation / demodulation unit 230 executes data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (eNB100A or gNB100B).
- Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread (DFT-S-OFDM) may be applied to the modulation / demodulation unit 230. Further, the DFT-S-OFDM may be used not only for the uplink (UL) but also for the downlink (DL).
- the control signal / reference signal processing unit 240 executes processing related to various control signals transmitted / received by the UE 200 and processing related to various reference signals transmitted / received by the UE 200.
- control signal / reference signal processing unit 240 receives various control signals transmitted from the eNB 100A or gNB 100B via a predetermined control channel, for example, control signals of the radio resource control layer (RRC). Further, the control signal / reference signal processing unit 240 transmits various control signals to the eNB 100A or gNB 100B via a predetermined control channel.
- a predetermined control channel for example, control signals of the radio resource control layer (RRC).
- RRC radio resource control layer
- the control signal / reference signal processing unit 240 executes processing using a reference signal (RS) such as Demodulation Reference Signal (DMRS) and Phase Tracking Reference Signal (PTRS).
- RS reference signal
- DMRS Demodulation Reference Signal
- PTRS Phase Tracking Reference Signal
- DMRS is a reference signal (pilot signal) known between the base station and the terminal of each terminal for estimating the fading channel used for data demodulation.
- PTRS is a terminal-specific reference signal for the purpose of estimating phase noise, which is a problem in high frequency bands.
- the reference signal may include ChannelStateInformation-ReferenceSignal (CSI-RS), SoundingReferenceSignal (SRS), and PositioningReferenceSignal (PRS) for location information.
- CSI-RS ChannelStateInformation-ReferenceSignal
- SRS SoundingReferenceSignal
- PRS PositioningReferenceSignal
- control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel), Random Access Radio Network Temporary Identifier (RA-RNTI), Downlink Control Information (DCI), and Physical Broadcast Channel (PBCH) etc. are included.
- PDCCH Physical Downlink Control Channel
- PUCCH Physical Uplink Control Channel
- RACH Random Access Channel
- RA-RNTI Random Access Radio Network Temporary Identifier
- DCI Downlink Control Information
- PBCH Physical Broadcast Channel
- the data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel).
- Data means data transmitted over a data channel.
- the data channel may be read as a shared channel.
- the control signal / reference signal processing unit 240 receives the downlink control information (DCI).
- DCI has existing fields such as DCI Formats, Carrier indicator (CI), BWP indicator, FDRA (Frequency Domain Resource Allocation), TDRA (Time Domain Resource Allocation), MCS (Modulation and Coding Scheme), HPN (HARQ Process Number). , NDI (NewDataIndicator), RV (RedundancyVersion), etc. are included.
- the value stored in the DCI Format field is an information element that specifies the DCI format.
- the value stored in the CI field is an information element that specifies the CC to which DCI applies.
- the value stored in the BWP indicator field is an information element that specifies the BWP to which DCI applies.
- the BWP that can be specified by the BWP indicator is set by the information element (BandWidthPart-Config) included in the RRC message.
- the value stored in the FDRA field is an information element that specifies the frequency domain resource to which DCI applies.
- the frequency domain resource is specified by the value stored in the FDRA field and the information element (RAType) contained in the RRC message.
- the value stored in the TDRA field is an information element that specifies the time domain resource to which DCI applies.
- the time domain resource is specified by the value stored in the TDRA field and the information element (pdsch-TimeDomainAllocationList) contained in the RRC message.
- Time domain resources may be specified by the values stored in the TDRA field and the default table.
- the value stored in the MCS field is an information element that specifies the MCS to which DCI applies.
- MCS is specified by the values stored in MCS and the MCS table.
- the MCS table may be specified by RRC messages or specified by RNTI scrambling.
- the value stored in the HPN field is an information element that specifies the HARQ Process to which DCI is applied.
- the value stored in the NDI is an information element for specifying whether or not the data to which DCI is applied is the initial data.
- the value stored in the RV field is an information element that specifies the redundancy of the data to which DCI is applied.
- control signal / reference signal processing unit 240 constitutes a transmission unit that transmits a message including an information element set as a variable.
- the variable is a variable in which an information element related to the PSCell before the change is set when the cell included in the SCG (for example, PSCell (Primary-SecondaryCell)) is changed in MR-DC.
- the variable may be referred to as the varMobilityHistoryReport.
- the variable may be referred to as a visitedCellInfoList contained in the varMobilityHistoryReport.
- the message containing the visitedCellInfoList may be an RRC message.
- a message containing a visitedCellInfoList may include a UEInformationResponse sent in response to a UEInformationRequest.
- a message containing a visitedCellInfoList may include UEAssistanceInformation transmitted autonomously by the UE200.
- the coding / decoding unit 250 executes data division / concatenation and channel coding / decoding for each predetermined communication destination (eNB100A or gNB100B).
- the coding / decoding unit 250 divides the data output from the data transmission / reception unit 260 into predetermined sizes, and executes channel coding for the divided data. Further, the coding / decoding unit 250 decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.
- the data transmission / reception unit 260 executes transmission / reception of Protocol Data Unit (PDU) and Service Data Unit (SDU).
- the data transmitter / receiver 260 is a PDU / SDU in a plurality of layers (such as a medium access control layer (MAC), a radio link control layer (RLC), and a packet data convergence protocol layer (PDCP)). Assemble / disassemble the.
- the data transmission / reception unit 260 executes data error correction and retransmission control based on the hybrid ARQ (Hybrid automatic repeat request).
- the control unit 270 controls each functional block that constitutes the UE200.
- the control unit 270 sets the information element related to the PSCell before the change as a variable when the cell included in the SCG (for example, PSCell (Primary-SecondaryCell)) is changed in the MR-DC.
- the variables may be referred to as varMobilityHistoryReport or visitedCellInfoList.
- the PS Cell may be changed from SC1 to SC2 while MC1 is being used as a PCell. Furthermore, the PS Cell may be changed from SC2 to SC3 while MC1 is being used as a PCell.
- UE200 when PSCell is changed from SC1 to SC2, UE200 sets the information element related to SC1 before the change as visitedCellInfoList. Furthermore, when the PSCell is changed from SC2 to SC3, the UE200 may set the information element related to SC2 before the change as a visitedCellInfoList.
- the information element related to the cell may include a CGI (Cell Global Identify) that uniquely identifies the cell in the wireless communication system 10.
- the information element related to the cell may include PCI (Physical Cell Identify) that uniquely identifies the cell in the SN400.
- the information element about the cell may include an ARFCN (Absolute Radio-Frequency Channel Number) that identifies the frequency of the cell.
- the UE200 sends a message containing the visitedCellInfoList to the network.
- the UE200 may send a message containing the visitedCellInfoList to the MN300.
- the UE200 may send a message containing a visitedCellInfoList to the SN400 via the MN300.
- the UE200 may send a message containing a visitedCellInfoList to the SN400 without going through the MN300.
- MR-DC may be NE-DC or NR-DC.
- FIG. 4 is a sequence diagram showing an operation example 1.
- step S10 the UE200 detects a change in the PS Cell contained in the SCG in the EN-DC.
- step S11 the UE200 sets the information element related to the PSCell before the change as a visitedCellInfoList.
- the UE200 receives the UEInformationRequest from the MN300.
- the UEInformationRequest may include an information element that explicitly requests a visitedCellInfoList.
- the UEInformationRequest may include an information element that explicitly requests the mobilityHistoryReport or mobilityHistoryReportOfPScell.
- the UE200 sends a UEInformationResponse to the MN300.
- UEInformationResponse contains a visitedCellInfoList in which information elements related to the PSCell before the change are set. If two or more PSCell changes have been made, the visitedCellInfoList may contain two or more information elements about the unchanged PSCell.
- the visitedCellInfoList is notified to the MN300. Therefore, in step S13, the visitedCellInfoList is encoded as an information element related to E-UTRAN20.
- the UEInformationResponse may include UEInformationResponse-r17-IEs.
- UEInformationResponse-r17-IEs may include mobilityHistoryReportNR-r17.
- mobilityHistoryReportNR-r17 may include VisitedCellInfoListNR-r17. Note that mobilityHistoryReportNR-r17 may be an example of an information element indicating the change history of PSCell included in SCG.
- VisitedCellInfoListNR may include visitedCellInfoNR-r17 (that is, an information element related to PSCell before the change). It may include visitedCellInfoNR-r17 (that is, the identification information of the PSCell before the change).
- the visitedCellID-r17 may include cgi-Info-r17 (ie, PSCell's CGI) or pci-arfcn-r17 (ie, PSCell's PCI and ARFCN).
- the visitedCellInfoNR-r17 may include an information element (timeSpentNR-r17) indicating the time that the UE200 stayed in the PSCell before the change.
- timeSpentNR-r17 an information element
- FIG. 7 is a sequence diagram showing an operation example 2.
- step S20 the UE 200 detects a change in the PS Cell contained in the SCG in the EN-DC.
- step S21 UE200 sets the information element related to the PSCell before the change as a visitedCellInfoList.
- step S22 send UL Information Transfer MRDC to MN300.
- ULInformationTransferMRDC includes UEAssistanceInformation, and UEAssistanceInformation contains a visitedCellInfoList in which information elements related to the PSCell before the change are set. If two or more PSCell changes have been made, the visitedCellInfoList may contain two or more information elements about the unchanged PSCell.
- the visitedCellInfoList is transparently notified to the SN400, so in step S22, the visitedCellInfoList is encoded as an information element related to NG RAN30.
- step S23 MN300 sends RRC Transfer to SN400.
- RRC Transfer includes visitedCellInfoList included in UEAssistanceInformation.
- ULInformationTransferMRDC includes ul-DCCH-MessageNR.
- the ul-DCCH-MessageNR is an information element used for transferring an RRC message regarding NG RAN30, and the RRC message regarding NG RAN30 includes UEAssistanceInformation (see FIG. 10).
- UEAssistanceInformation may include UEAssistanceInformation-r17-IEs.
- UEAssistanceInformation-r17-IEs may include mobilityHistoryReport-r17.
- the mobilityHistoryReport-r17 may include the mobilityHistoryReport-r16.
- mobilityHistoryReport-r16 may include VisitedCellInfoList-r16.
- mobilityHistoryReport-r17 may be an example of an information element indicating the change history of PSCell included in SCG.
- the VisitedCellInfoList-r16 may include the CGI, PCI and ARFCN of the PSCell before the change, like the VisitedCellInfoListNR-r17.
- the VisitedCellInfoList-r16 may include an information element (timeSpent) indicating the time that the UE200 stayed in the PSCell before the change.
- the operation example 2 illustrates the case where the visitedCellInfoList is transparently transmitted to the SN400 (gNB100B) in EN-DC
- the message regarding NG RAN30 is exemplified in FIG. Is.
- FIG. 9 is a sequence diagram showing an operation example 3.
- step S30 the UE 200 detects a change in the PS Cell contained in the SCG in the EN-DC.
- step S31 the UE200 sets the information element related to the PSCell before the change as a visitedCellInfoList.
- the MN300 receives the RRC Transfer from the SN400.
- the RRC Transfer may include a UEInformationRequest, and the UEInformationRequest may include an information element that explicitly requests a visitedCellInfoList.
- the UEInformationRequest may include an information element that explicitly requests the mobilityHistoryReport or mobilityHistoryReportOfPScell.
- step S33 the MN300 sends the DLInformationTransfer MRDC to the UE200.
- DLInformationTransferMRDC includes UEInformationRequest included in RRCTransfer.
- UE200 sends ULInformationTransfer MRDC to MN300.
- ULInformationTransferMRDC contains UEInformationResponse, and UEInformationResponse contains visitedCellInfoList in which information elements related to PSCell before change are set. If two or more PSCell changes have been made, the visitedCellInfoList may contain two or more information elements about the unchanged PSCell.
- the visitedCellInfoList is transparently notified to the SN400, so that the visitedCellInfoList is encoded as an information element related to NG RAN30 in step S33.
- step S35 MN300 sends RRC Transfer to SN400.
- RRC Transfer includes visitedCellInfoList included in UEInformationResponse.
- ULInformationTransferMRDC includes ul-DCCH-MessageNR.
- ul-DCCH-MessageNR is an information element used for transferring an RRC message related to NG RAN30, and the RRC message related to NG RAN30 includes a UE Information Response.
- the operation example 3 illustrates the case where the MN300 (eNB100A) receives the UL Information Transfer MRDC in the EN-DC
- the message regarding the E-UTRAN 20 is exemplified in FIG. ..
- FIG. 11 is a sequence diagram showing an operation example 4.
- SRB3 is set to UE200 is taken as an example.
- SRB3 is an SRB (Signaling Radio Bearer) for directly transmitting an NR measurement report (RRC Measurement Report) from UE200 to SN400 (gNB100B) in EN-DC.
- RRC Measurement Report NR measurement report
- step S40 the UE 200 detects a change in the PS Cell contained in the SCG in the EN-DC.
- step S41 UE200 sets the information element related to the PSCell before the change as a visitedCellInfoList.
- step S42 send UEAssistanceInformation directly to the SN400.
- UEAssistanceInformation contains a visitedCellInfoList in which information elements related to the PSCell before the change are set. If two or more PSCell changes have been made, the visitedCellInfoList may contain two or more information elements about the unchanged PSCell.
- the visitedCellInfoList is directly notified to the SN400, so that the visitedCellInfoList is encoded as an information element related to NG RAN30 in step S42.
- the UE200 sets the information element related to the PSCell before the change as a variable (visitedCellInfoList), and the information element set as the variable (CGI of PSCell, PSCell).
- the network (MN300 or SN400) can grasp the change history of PSCell in MR-DC (in other words, the movement history of UE200), and set the mobility parameter for SN400 appropriately.
- the mobility parameter for the SN400 is a threshold that is compared with the receive quality (RSRP; Reference Signal Received Power, RSRQ; Reference Signal Received Quality) to determine the change in the PS Cell.
- RSRP Reference Signal Received Power
- RSRQ Reference Signal Received Quality
- the mobility parameter may include TimeToTrigger, a3-offset, hysteresis, and the like.
- Event A5 TS38.331 V16.1.0 ⁇ 5.5.4.6 “SpCell Becomes worst than threshold1 and neighbor benefits better than threshold2”
- the mobility parameter includes TimeToTrigger, a5-Threshold1, a5-Threshold2, hysteresis, etc. good.
- the mobility parameter may include TimeToTrigger, b1-ThresholdNR, hysteresis, etc.
- Event B2-NR TS38.331 V16.1.0 ⁇ 5.5.4.9 “PCell becomes worst than threshold1 and inter RAT neighbor belongs better than threshold2”
- the mobility parameter is TimeToTrigger, b2-Threshold1, b2-Threshold2NR, hysteresis. Etc. may be included.
- the eNB100A (MN300) can grasp the change history of the PSCell on the NR side
- the eNB100A (MN300) can appropriately set the mobility parameter for the SN400 on the NR side (for example, the above-mentioned operation example 1).
- the gNB100B (SN400) can grasp the change history of the PSCell on the NR side
- the gNB100B (SN400) can appropriately set the mobility parameter for the SN400 on the NR side (for example, the above-mentioned operation examples 2 to 2). Operation example 4).
- the information element related to PSCell before the change is set as a variable.
- the UE 200 sets the information element related to PSCell used in MR-DC as a variable in association with the information element related to PCell used in MR-DC.
- the UE200 sends a message to the network by associating the information element related to PSCell before the change with the information element related to PCell.
- the variable used in operation example 1 may be called VisitedCellInfoListEN-DC.
- the VisitedCellInfoListEN-DC includes an information element related to PCell used in EN-DC (visitedCellIdEUTRA-r17) and an information element related to PSCell used in EN-DC (visitedCellInfoNR-r17). But it may be.
- the information element related to PCell may include at least one of PCell's CGI (cellGlobalId-r12) and PCell's PCI / ARFCN (pci-arfcn-r12).
- the information element related to PSCell may include at least one of CGI (cgi-Info) of PSCell and PCI / ARFCN (pci-arfcn-r17) of PSCell.
- the VisitedCellInfoListEN-DC may include an information element (timeSpentEN-DC-r17) indicating the time that the UE200 has stayed in the cells (PCell and PSCell) of the EN-DC.
- timeSpentEN-DC-r17 an information element indicating the time that the UE200 has stayed in the cells (PCell and PSCell) of the EN-DC.
- VisitedCellInfoListEN-DC The variable used in any of operation examples 2 to 4 may be referred to as VisitedCellInfoListEN-DC.
- the VisitedCellInfoListEN-DC (VisitedCellInfoListEN-DC-r17) is an information element (nr-CellId-r16) related to PSCell used in EN-DC and an information element (eutra-CellId-) related to PCell used in EN-DC. r16) may be included.
- the information element (nr-CellId-r16) related to PSCell may include at least one of CGI (cgi-Info) of PSCell and PCI / ARFCN (pci-arfcn-r16) of PSCell.
- the information element related to PCell may include at least one of PCell's CGI (cgi-Info) and PCell's PCI / ARFCN (pci-arfcn-r16).
- the VisitedCellInfoListEN-DC may include an information element (timeSpentEN-DC-r17) indicating the time that the UE200 has stayed in the cells (PCell and PSCell) of the EN-DC.
- timeSpentEN-DC-r17 an information element indicating the time that the UE200 has stayed in the cells (PCell and PSCell) of the EN-DC.
- the UE200 sends a message to the network (MN300 or SN400) by associating the information element related to PSCell before the change with the information element related to PCell.
- the network MN300 or SN400
- the network can grasp the PSCell in MR-DC in relation to PCell, and can grasp the movement history of UE200 more appropriately.
- the cell (PSCell) included in the SCG is used for the node that manages the other of the MCG and the SCG.
- a transmitter for transmitting a message including a change history for example, MobilityHistoryReport
- the MobilityHistoryReport includes information elements related to PSCell used in MR-DC (hereinafter referred to as visitedCellInfoList (SN)).
- the SN400 when the SN400 manages the change history of the PSCell included in the SCG, the SN400 sends a message containing an information element (visitedCellInfoList (SN)) related to the PSCell used in the MR-DC to the MN300. May be good.
- the MN300 when the MN300 manages the change history of the PSCell included in the SCG, the MN300 may send a message including an information element (visitedCellInfoList (SN)) regarding the PSCell used in the MR-DC to the SN400.
- the MN300 may manage the change history of the PCell used in the MR-DC.
- the MN may send a message containing an information element (visitedCellInfoList (MN)) regarding PCell used in the MR-DC to the SN400.
- visitedCellInfoList MN
- the change history of PCell used in MR-DC may include PCell's CGI, Cell type (cell size), Time UE Stayed In Cell, HO (Handover) cause value, and Time stamp.
- the information element (visitedCellInfoList (MN)) about PCell used in MR-DC may include these information elements.
- Timestamp is an information element for associating the change history of PCell (visitedCellInfoList (MN)) with the change history of PSCell (visitedCellInfoList (SN)). Timestamp may be an information element indicating the time when PCell was changed.
- the change history of PSCell used in MR-DC may include CGI of PSCell, Cell type (cell size), Time spent in PS Cell, and Time stamp.
- the information element (visitedCellInfoList (SN)) related to PSCell used in MR-DC may include these information elements.
- Timestamp is an information element for associating the change history of PCell (visitedCellInfoList (MN)) with the change history of PSCell (visitedCellInfoList (SN)). Timestamp may be an information element indicating the time when PSCell was changed.
- the Timespent in PSCell may be the time during which the UE200 stays in the PSCell, or may be the time from the establishment of the MR-DC to the release of the MR-DC. It may be the time from the establishment of one PSCell to the establishment of the next PSCell.
- MR-DC may be NE-DC or NR-DC.
- a case where a message including an information element (visitedCellInfoList (SN)) related to PSCell used in MR-DC is transmitted from SN400 to MN300 will be described.
- the SN400 manages an information element (visitedCellInfoList (SN)) related to PSCell used in MR-DC.
- the SN400 may manage the visitedCellInfoList (SN) by the methods of the operation examples 2 to 4 described in the embodiment.
- a case where the MN300 starts operation will be described.
- step S50 the MN300 modifies the SN400 (that is, gNB100B) message (sgNB release request), the SN400 change request (sgNB change request), and the SN400. Send one of the requested messages (sgNB modification request) to the SN400.
- gNB100B gNB100B
- the SN400 sends a response message to the message received in step S50 to the MN300.
- the response message is a response message to sgNB release request (sgNB release request ack), a response message to sgNB change request (sgNB change request ack), or a response message to sgNB modification request (sgNB modification request ack).
- the response message contains an information element (visitedCellInfoList (SN)) related to PSCell used in MR-DC.
- the MN300 may associate PCell with PSCell based on the time stamp included in the change history of PCell and the information element (visitedCellInfoList (SN)) related to PSCell.
- SN400 manages an information element (visitedCellInfoList (SN)) related to PSCell used in MR-DC.
- the SN400 may manage the visitedCellInfoList (SN) by the methods of the operation examples 2 to 4 described in the embodiment.
- the case where the SN400 starts operation will be described.
- step S60 the SN400 requests a message requesting the release of the SN400 (that is, gNB100B) (sgNB release required), a message requesting a change of the SN400 (sgNB change required), and a modification of the SN400. Send any one of the messages (sgNB modification required) to the MN300.
- the message shown in step S60 includes an information element (visitedCellInfoList (SN)) related to PSCell used in MR-DC.
- step S61 the MN300 sends a response message to the message received in step S60 to the SN400.
- the response message is a response message to sgNB release required (sgNB release required confirm), a response message to sgNB change required (sgNB change required confirm), or a response message to sgNB modification required confirm (sgNB modification required confirm).
- the response message contains an information element (visitedCellInfoList (SN)) related to PSCell used in MR-DC.
- the MN300 may associate PCell with PSCell based on the time stamp included in the change history of PCell and the information element (visitedCellInfoList (SN)) related to PSCell.
- FIG. 15 illustrates a case where the information element (visitedCellInfoList (SN)) related to PSCell used in MR-DC is included in the message shown in step S60.
- the sequence shown in FIG. 15 is not limited to this.
- the MN300 after receiving the message shown in step S60, the MN300 sends a message requesting the SN400 for an information element (visitedCellInfoList (SN)) related to PSCell used in the MR-DC, and an information element related to PSCell (visitedCellInfoList (SN)).
- a message containing the above may be received from the SN400.
- the MN300 manages an information element (visitedCellInfoList (SN)) related to PSCell used in MR-DC.
- the MN300 may manage the visitedCellInfoList (SN) by the method of the operation example 1 described in the embodiment.
- the SN400 requests a message requesting the release of the SN400 (that is, gNB100B) (sgNB release required), a message requesting a change of the SN400 (sgNB change required), and a modification of the SN400. Send any one of the messages (sgNB modification required) to the MN300.
- step S71 the MN300 sends a response message to the message received in step S70 to the SN400.
- the response message is a response message to sgNB release required (sgNB release required confirm), a response message to sgNB change required (sgNB change required confirm), or a response message to sgNB modification required confirm (sgNB modification required confirm).
- the response message contains an information element (visitedCellInfoList (SN)) related to PSCell used in MR-DC.
- the information element (visitedCellInfoList (SN)) related to PSCell used in MR-DC was mainly described.
- modification 2 is not limited to this.
- the MN300 may send a message containing the information element (visitedCellInfoList (MN)) about PCell used in the MR-DC to the SN400. good.
- the message including the information element related to PCell (visitedCellInfoList (MN)) may be the message (sgNB release / change / modification request) shown in step S50 of FIG. 14, and may be step S61 shown in FIG. 15 or step S71 shown in FIG.
- the SN400 may associate the PCell with the PSCell based on the change history of the PSCell and the Timestamp included in the information element (visitedCellInfoList (MN)) related to the PCell.
- the network can collect the change history of PSCell (for example, MobilityHistoryReport), and the mobility parameter related to SN400 can be set appropriately. As a result, it is possible to suppress the ping-pong phenomenon of SCG change and connection failure.
- PSCell for example, MobilityHistoryReport
- the information element related to PCell used in MR-DC (visitedCellInfoList (MN)) or the information element related to PSCell used in MR-DC (visitedCellInfoList (SN)) includes a Timestamp for associating them. Therefore, in MR-DC, PCell and PSCell can be appropriately associated.
- EN-DC is mainly exemplified as an example of MR-DC.
- MR-DC may be NE-DC or NR-DC.
- SRB3 is not set to UE200, the operation example 3 described in the embodiment may not be used.
- each functional block is realized by any combination of at least one of hardware and software.
- the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , Wired, wireless, etc.) and may be realized using these plurality of devices.
- the functional block may be realized by combining the software with the one device or the plurality of devices.
- Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't.
- a functional block (configuration unit) that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter).
- the realization method is not particularly limited.
- FIG. 17 is a diagram showing an example of the hardware configuration of the device.
- the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.
- the word “device” can be read as a circuit, device, unit, etc.
- the hardware configuration of the device may be configured to include one or more of each of the devices shown in the figure, or may be configured not to include some of the devices.
- Each functional block of the device (see FIG. 2) is realized by any hardware element of the computer device or a combination of the hardware elements.
- the processor 1001 performs calculations by loading predetermined software (program) on the hardware such as the processor 1001 and the memory 1002, and controls the communication by the communication device 1004, or the memory. It is realized by controlling at least one of reading and writing of data in 1002 and storage 1003.
- Processor 1001 operates, for example, an operating system to control the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.
- CPU central processing unit
- the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
- a program program code
- a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used.
- the various processes described above may be executed by one processor 1001 or may be executed simultaneously or sequentially by two or more processors 1001.
- Processor 1001 may be implemented by one or more chips.
- the program may be transmitted from the network via a telecommunication line.
- the memory 1002 is a computer-readable recording medium, and is composed of at least one such as ReadOnlyMemory (ROM), ErasableProgrammableROM (EPROM), Electrically ErasableProgrammableROM (EEPROM), and RandomAccessMemory (RAM). May be done.
- the memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store a program (program code), a software module, or the like that can execute the method according to the embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, for example, an optical disk such as Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like.
- Storage 1003 may be referred to as auxiliary storage.
- the recording medium described above may be, for example, a database, server or other suitable medium containing at least one of the memory 1002 and the storage 1003.
- the communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of.
- FDD frequency division duplex
- TDD time division duplex
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- Bus 1007 may be configured using a single bus or may be configured using different buses for each device.
- the device includes hardware such as a microprocessor, a digital signal processor (Digital Signal Processor: DSP), ApplicationSpecific IntegratedCircuit (ASIC), ProgrammableLogicDevice (PLD), and FieldProgrammableGateArray (FPGA).
- the hardware may implement some or all of each functional block.
- processor 1001 may be implemented using at least one of these hardware.
- information notification includes physical layer signaling (eg Downlink Control Information (DCI), Uplink Control Information (UCI), higher layer signaling (eg RRC signaling, Medium Access Control (MAC) signaling, Master Information Block). (MIB), System Information Block (SIB)), other signals or combinations thereof.
- DCI Downlink Control Information
- UCI Uplink Control Information
- RRC signaling eg RRC signaling, Medium Access Control (MAC) signaling, Master Information Block). (MIB), System Information Block (SIB)
- RRC signaling may also be referred to as an RRC message, eg, RRC Connection Setup. ) Message, RRC Connection Reconfiguration message, etc. may be used.
- LTE LongTermEvolution
- LTE-A LTE-Advanced
- SUPER3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- FutureRadioAccess FAA
- NewRadio NR
- W-CDMA registered trademark
- GSM registered trademark
- CDMA2000 Code Division Multiple Access 2000
- UMB UltraMobileBroadband
- IEEE802.11 Wi-Fi (registered trademark)
- IEEE802.16 WiMAX®
- IEEE802.20 Ultra-WideBand
- Bluetooth® Ultra-WideBand
- other systems that utilize appropriate systems and at least one of the next-generation systems extended based on them. It may be applied to one.
- a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).
- the specific operation performed by the base station in this disclosure may be performed by its upper node (upper node).
- various operations performed for communication with the terminal are the base station and other network nodes other than the base station (eg, MME or). It is clear that it can be done by at least one of (but not limited to, S-GW, etc.).
- S-GW network node
- the case where there is one network node other than the base station is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).
- Information and signals can be output from the upper layer (or lower layer) to the lower layer (or upper layer).
- Input / output may be performed via a plurality of network nodes.
- the input / output information may be stored in a specific location (for example, memory) or may be managed using a management table. I / O information can be overwritten, updated, or added. The output information may be deleted. The entered information may be transmitted to other devices.
- the determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).
- the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- a transmission medium For example, a website, where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.).
- wired technology coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.
- wireless technology infrared, microwave, etc.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
- a channel and a symbol may be a signal (signaling).
- the signal may be a message.
- the component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.
- system and “network” used in this disclosure are used interchangeably.
- the information, parameters, etc. described in the present disclosure may be expressed using an absolute value, a relative value from a predetermined value, or another corresponding information. It may be represented.
- the radio resource may be one indicated by an index.
- Base Station BS
- Wireless Base Station Wireless Base Station
- Fixed Station NodeB
- eNodeB eNodeB
- gNodeB gNodeB
- Access point "transmission point”
- reception point "transmission / reception point”
- cell “sector”
- Cell group “cell group”
- Terms such as “carrier” and “component carrier” may be used interchangeably.
- Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
- a base station can accommodate one or more (eg, three) cells (also called sectors). When a base station accommodates multiple cells, the entire base station coverage area can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a remote radio for indoor use). Communication services can also be provided by Head: RRH).
- RRH Remote Radio Head
- cell refers to a base station that provides communication services in this coverage, and part or all of the coverage area of at least one of the base station subsystems.
- MS Mobile Station
- UE user equipment
- terminal terminal
- Mobile stations can be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on the mobile body, a mobile body itself, or the like.
- the moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be.
- at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
- at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read as a mobile station (user terminal, the same shall apply hereinafter).
- communication between a base station and a mobile station has been replaced with communication between a plurality of mobile stations (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- D2D Device-to-Device
- V2X Vehicle-to-Everything
- Each aspect / embodiment of the present disclosure may be applied to the configuration.
- the mobile station may have the functions of the base station.
- words such as "up” and “down” may be read as words corresponding to communication between terminals (for example, "side”).
- the upstream channel, the downstream channel, and the like may be read as a side channel.
- the mobile station in the present disclosure may be read as a base station.
- the base station may have the functions of the mobile station.
- the radio frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe. Subframes may further be composed of one or more slots in the time domain.
- the subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.
- the numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel.
- Numerology includes, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval: TTI), number of symbols per TTI, wireless frame configuration, transmission / reception. It may indicate at least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like.
- the slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time area.
- the slot may be a unit of time based on numerology.
- the slot may include a plurality of mini slots. Each minislot may be composed of one or more symbols in the time domain. Further, the mini slot may be referred to as a sub slot. The minislot may consist of a smaller number of symbols than the slot.
- PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (or PUSCH) mapping type A.
- the PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.
- the wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal.
- the radio frame, subframe, slot, minislot and symbol may have different names corresponding to each.
- one subframe may be referred to as a transmission time interval (TTI)
- TTI transmission time interval
- TTI transmission time interval
- TTI transmission time interval
- TTI transmission time interval
- TTI transmission time interval
- TTI slot or one minislot
- at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (eg, 1-13 symbols), or a period longer than 1ms. May be.
- the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
- a base station schedules each user terminal to allocate wireless resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units.
- the definition of TTI is not limited to this.
- TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
- the time interval for example, the number of symbols
- the transport block, code block, code word, etc. may be shorter than the TTI.
- one or more TTIs may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- TTI with a time length of 1 ms may be called normal TTI (TTI in LTE Rel.8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc.
- a TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.
- the long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms
- the short TTI (for example, shortened TTI, etc.) may be read as a TTI less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.
- the resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
- the number of subcarriers contained in RB may be the same regardless of numerology, and may be, for example, 12.
- the number of subcarriers contained in the RB may be determined based on numerology.
- the time domain of RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI.
- Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
- One or more RBs are physical resource blocks (Physical RB: PRB), sub-carrier groups (Sub-Carrier Group: SCG), resource element groups (Resource Element Group: REG), PRB pairs, RB pairs, etc. May be called.
- Physical RB Physical RB: PRB
- sub-carrier groups Sub-Carrier Group: SCG
- resource element groups Resource Element Group: REG
- PRB pairs RB pairs, etc. May be called.
- the resource block may be composed of one or a plurality of resource elements (ResourceElement: RE).
- RE resource elements
- 1RE may be a radio resource area of 1 subcarrier and 1 symbol.
- Bandwidth Part (which may also be called partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. good.
- the common RB may be specified by the index of the RB with respect to the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP).
- BWP for UL
- DL BWP BWP for DL
- One or more BWPs may be set in one carrier for the UE.
- At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP.
- “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
- the above-mentioned structures such as wireless frames, subframes, slots, mini-slots and symbols are merely examples.
- the number of subframes contained in a radio frame the number of slots per subframe or radioframe, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in RB.
- the number of subcarriers, as well as the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.
- connection means any direct or indirect connection or connection between two or more elements and each other. It can include the presence of one or more intermediate elements between two “connected” or “joined” elements.
- the connection or connection between the elements may be physical, logical, or a combination thereof.
- connection may be read as "access”.
- the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. Can be considered to be “connected” or “coupled” to each other using electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions.
- the reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot (Pilot) depending on the applied standard.
- RS Reference Signal
- Pilot pilot
- each of the above devices may be replaced with a "part”, a “circuit”, a “device”, or the like.
- references to elements using designations such as “first” and “second” as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Therefore, references to the first and second elements do not mean that only two elements can be adopted there, or that the first element must somehow precede the second element.
- determining and “determining” used in this disclosure may include a wide variety of actions.
- “Judgment” and “decision” are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). It may include (eg, searching in a table, database or another data structure), ascertaining as “judgment” or “decision”.
- judgment and “decision” are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. It may include (for example, accessing data in memory) to be regarded as “judgment” or “decision”.
- judgment and “decision” are considered to be “judgment” and “decision” when the things such as solving, selecting, choosing, establishing, and comparing are regarded as “judgment” and “decision”. Can include. That is, “judgment” and “decision” may include considering some action as “judgment” and “decision”. Further, “judgment (decision)” may be read as “assuming", “expecting”, “considering” and the like.
- the term "A and B are different” may mean “A and B are different from each other”.
- the term may mean that "A and B are different from C”.
- Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
- Wireless communication system 20 E-UTRAN 30 NG RAN 40 Core Network 50 E-SMLC 100A eNB 100B gNB 200 UE 210 Wireless signal transmitter / receiver 220 Amplifier 230 Modulator / demodulator 240 Control signal / reference signal processing 250 Encoding / decoding 260 Data transmitter / receiver 270 Control 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus
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Abstract
Description
図1は、実施形態に係る無線通信システム10の全体概略構成図である。無線通信システム10は、Long Term Evolution(LTE)及び5G New Radio(NR)に従った無線通信システムである。なお、LTEは4Gと呼ばれてもよいし、NRは、5Gと呼ばれてもよい。
次に、無線通信システム10の機能ブロック構成について説明する。具体的には、UE200の機能ブロック構成について説明する。
以下において、実施形態の適用シーンについて説明する。適用シーンでは、UE200がMN300及びSN400と通信を行うMR-DCにおいてPSCellの変更が実行されるケースについて説明する。図3では、MN300としてMN300A及びMN300Bが例示されており、SN400としてSN400A~SN400Fが例示されている。MN300が有するセルとしてMC1及びMC2が例示されており、SN400が有するセルとしてSC1~SC6が例示されている。例えば、SC1~SC3のカバレッジエリアは、MC1のカバレッジエリアと重複しており、SC4~SC6のカバレッジエリアは、MC2のカバレッジエリアと重複している。このようなケースにおいて、MC1及びMC2はPCell(Primary Cell)として用いられ得るセルであり、SC1~SC6はPSCellとして用いられ得るセルである。
以下において、実施形態の動作例について説明する。以下においては、MR-DCとしてEN-DCが実行されるケースについて例示する。すなわち、E-UTRAN20に含まれるeNB100AがMN300であり、NG RAN30に含まれるgNB100BがSN400であるケースについて例示する。但し、実施形態はこれに限定されるものではない。MR-DCは、NE-DCであってもよく、NR-DCであってもよい。
以下において、visitedCellInfoListを含むメッセージをMN300に送信するケースについて説明する。図4は、動作例1を示すシーケンス図である。
以下において、MN300を介してvisitedCellInfoListを含むメッセージをSN400に送信するケースについて説明する。図7は、動作例2を示すシーケンス図である。
以下において、MN300を介してvisitedCellInfoListを含むメッセージをSN400に送信するケースについて説明する。図9は、動作例3を示すシーケンス図である。
以下において、MN300を介さずにvisitedCellInfoListを含むメッセージをSN400に送信するケースについて説明する。図11は、動作例4を示すシーケンス図である。図11では、SRB3がUE200に設定されているケースを例に挙げる。SRB3は、EN-DCにおいてNRに関する測定報告(RRC Measurement Report)をUE200からSN400(gNB100B)に直接的に送信するためのSRB(Signaling Radio Bearer)である。
実施形態では、UE200は、PSCellが変更された場合に、変更前のPSCellに関する情報要素を変数(visitedCellInfoList)として設定し、変数として設定された情報要素(PSCellのCGI、PSCellのPCI、PSCellのARFCN、timeSpentなど)を含むメッセージをネットワーク(MN300又はSN400)に送信する。このような構成によれば、ネットワーク(MN300又はSN400)は、MR-DCにおけるPSCellの変更履歴(言い換えると、UE200の移動履歴)を把握することができ、SN400に関するmobility parameterを適切に設定することができる。例えば、SN400に関するmobility parameterは、PSCellの変更を判定するために受信品質(RSRP; Reference Signal Received Power、RSRQ; Reference Signal Received Quality)と比較される閾値などである。
以下において、実施形態の変更例1について説明する。以下においては、実施形態に対する相違点について主として説明する。
以下において、実施形態の変更例2について説明する。以下においては、実施形態に対する相違点について主として説明する。
以上、実施形態について説明したが、当該実施形態の記載に限定されるものではなく、種々の変形及び改良が可能であることは、当業者には自明である。
無線フレームは時間領域において1つまたは複数のフレームによって構成されてもよい。時間領域において1つまたは複数の各フレームはサブフレームと呼ばれてもよい。サブフレームはさらに時間領域において1つまたは複数のスロットによって構成されてもよい。サブフレームは、ニューメロロジー(numerology)に依存しない固定の時間長(例えば、1ms)であってもよい。
20 E-UTRAN
30 NG RAN
40 コアネットワーク
50 E-SMLC
100A eNB
100B gNB
200 UE
210 無線信号送受信部
220 アンプ部
230 変復調部
240 制御信号・参照信号処理部
250 符号化/復号部
260 データ送受信部
270 制御部
1001 プロセッサ
1002 メモリ
1003 ストレージ
1004 通信装置
1005 入力装置
1006 出力装置
1007 バス
Claims (5)
- 第1セルグループ及び第2セルグループを用いたデュアルコネクティビティにおいて、前記第2セルグループに含まれるセルが変更された場合に、変更前のセルに関する情報要素を変数として設定する制御部と、
前記変数として設定された前記情報要素を含むメッセージをネットワークに送信する送信部と、を備える、端末。 - 前記送信部は、前記第1セルグループを管理する第1ノードに前記メッセージを送信する、請求項1に記載の端末。
- 前記送信部は、前記第1セルグループを管理する第1ノードを介して前記第2セルグループを管理する第2ノードに前記メッセージを送信する、或いは、前記第1セルグループを管理する第1ノードを介さずに前記第2セルグループを管理する第2ノードに前記メッセージを送信する、請求項1に記載の端末。
- 前記制御部は、前記変更前のセルに関する情報要素を前記第1セルグループに含まれるセルに関する情報要素と対応付けて前記変数として設定する、請求項1乃至請求項3のいずれか1項に記載の端末。
- 第1セルグループ及び第2セルグループを用いたデュアルコネクティビティにおいて、第1セルグループ及び第2セルグループのいずれか一方を管理する場合に、前記第1セルグループ及び第2セルグループのいずれか他方を管理するノードに対して、前記第2セルグループに含まれるセルの変更履歴を示す情報要素を含むメッセージを送信する送信部を備える、基地局。
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"New WID on enhancement of data collection for SON/MDT in NR", RP-201281, 3GPP TSG RAN MEETING # 86-E, July 2020 (2020-07-01) |
See also references of EP4221379A4 |
ZTE (MODERATOR): "Summary of Offline for MR-DC UHI", 3GPP DRAFT; R3-205659, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG3, no. Online; 20200817 - 20200828, 2 September 2020 (2020-09-02), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051928370 * |
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