WO2020166015A1 - Dispositif utilisateur et dispositif de station de base - Google Patents

Dispositif utilisateur et dispositif de station de base Download PDF

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Publication number
WO2020166015A1
WO2020166015A1 PCT/JP2019/005401 JP2019005401W WO2020166015A1 WO 2020166015 A1 WO2020166015 A1 WO 2020166015A1 JP 2019005401 W JP2019005401 W JP 2019005401W WO 2020166015 A1 WO2020166015 A1 WO 2020166015A1
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Prior art keywords
mcg
failure
cell group
recovery
master
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PCT/JP2019/005401
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English (en)
Japanese (ja)
Inventor
高橋　秀明
天楊 閔
徹 内野
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株式会社Ｎｔｔドコモ
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Priority to PCT/JP2019/005401 priority Critical patent/WO2020166015A1/fr
Publication of WO2020166015A1 publication Critical patent/WO2020166015A1/fr

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to a user device and a base station device in a wireless communication system.
  • NR New Radio
  • LTE Long Term Evolution
  • Non-Patent Document 2 In the NR system, similar to the dual connectivity in the LTE system, the data is divided between the base station (eNB) of the LTE system and the base station (gNB) of the NR system, and the data is simultaneously transmitted and received by these base stations, A technology called LTE-NR dual connectivity, NR-NR dual connectivity or multi-RAT (Multi Radio Access Technology) dual connectivity (hereinafter referred to as "MR-DC") has been introduced (for example, Non-Patent Document 2). ..
  • the present invention has been made in view of the above points, and an object thereof is to quickly recover from a connection failure in dual connectivity executed in a wireless communication system.
  • a communication unit that performs communication to which dual connectivity including a master cell group and a secondary cell group is applied, a control unit that detects the occurrence of a failure in the master cell group, and the master cell Information requesting recovery from a failure in a group, a transmission unit for transmitting to the master node, and the communication unit, in a state of continuing connection with the secondary node of the secondary cell group, the control unit There is provided a user equipment that changes a primary cell to another cell by handover.
  • FIG. 6 is a flowchart for explaining a first operation example (1) in the embodiment of the present invention. 6 is a flowchart for explaining a first operation example (2) in the embodiment of the present invention. 6 is a flowchart for explaining a first operation example (3) in the embodiment of the present invention. It is a specification change example (1) according to the first operation example in the embodiment of the present invention.
  • FIG. 6 is a flowchart for explaining a second operation example (3) in the embodiment of the present invention. It is a specification change example (3) according to the second operation example in the embodiment of the present invention. 7 is a flowchart for explaining a second operation example (4) in the embodiment of the present invention. It is a specification modification example (4) according to a second operation example in the embodiment of the present invention. It is a specification change example (5) according to the second operation example in the embodiment of the present invention. It is a specification change example (6) according to the second operation example in the embodiment of the present invention. It is a specification modification example (7) according to the second operation example in the embodiment of the present invention. It is a specification change example (8) concerning the second operation example in the exemplary embodiment of the present invention.
  • LTE Long Term Evolution
  • LTE-Advanced LTE-Advanced and subsequent schemes (eg, NR) unless otherwise specified.
  • SS Synchronization signal
  • PSS Primary SS
  • SSS Secondary SS
  • PBCH Physical broadcast channel
  • PRACH Physical Random access channel
  • the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or other (for example, Flexible Duplex). May be used.
  • “configuring” a wireless parameter and the like may mean that a predetermined value is preset (Pre-configure), or the base station device 10 Alternatively, the wireless parameter notified from the user device 20 may be set.
  • FIG. 1 is a diagram showing a configuration example of a network architecture in the embodiment of the present invention.
  • the wireless network architecture according to the embodiment of the present invention includes 4G-CU, 4G-RU (Remote Unit, remote wireless station), EPC (Evolved Packet Core), etc. on the LTE-Advanced side.
  • the wireless network architecture in the embodiment of the present invention includes 5G-CU, 5G-DU, etc. on the 5G side.
  • 4G-CU includes RRC (Radio Resource Control), PDCP (Packet Data Convergence Protocol), RLC (Radio Link Control), MAC (Medium Access Control), L1 (Layer 1, PHY layer or It includes layers up to the physical layer) and is connected to 4G-RU via CPRI (Common Public Radio Interface).
  • RRC Radio Resource Control
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • L1 Layer 1, PHY layer or It includes layers up to the physical layer
  • CPRI Common Public Radio Interface
  • the 5G-CU includes the RRC layer and is connected to the 5G-DU via the FH (Flonthaul) interface, and is connected to the 5GC (5G Core Network) and the NG interface (NG). interface). Further, the 5G-CU is connected to the 4G-CU by an X2 interface.
  • the PDCP layer in 4G-CU serves as a coupling or separation point when performing 4G-5G DC (Dual Connectivity), that is, EN-DC (E-UTRA-NR Dual Connectivity).
  • a network node including 5G-CU and 5G-DU is called gNB.
  • 5G-CU may be referred to as gNB-CU and 5G-DU may be referred to as gNB-DU.
  • CA Carrier Aggregation
  • DC is performed between 4G-RU and 5G-DU.
  • a UE User Equipment
  • a UE User Equipment
  • FIG. 1 shows a wireless network architecture at the time of LTE-NR DC, that is, EN-DC (E-UTRA-NR Dual Connectivity).
  • EN-DC E-UTRA-NR Dual Connectivity
  • a similar wireless network architecture may be used when separating 4G-CU into CU-DU or when operating NR standalone.
  • the functions related to the RRC layer and the PDCP layer may be moved to the 4G-CU, and the RLC layer and the layers below may be included in the 4G-DU.
  • the data rate of CPRI may be reduced by CU-DU separation.
  • NR-DC NR-NR Dual Connectivity
  • NR-DC may be performed by connecting the UE to multiple 5G-CUs, and the UE may connect to multiple 5G-DUs and a single 5G-CU.
  • NR-DC may be performed by.
  • FIG. 2 is a diagram showing a configuration example of a wireless communication system according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing a wireless communication system at the time of MR-DC (Multi-RAT Dual Connectivity).
  • the user apparatus 20 includes a base station apparatus 10A provided by the NR system and a base station apparatus 10B provided by the NR system (hereinafter, when the base station apparatus 10A and the base station apparatus 10B are not distinguished from each other). It may be referred to as “base station device 10 ”). Further, the user apparatus 20 uses the base station apparatus 10A as a master node (hereinafter also referred to as “MN”) and the base station apparatus 10B as a secondary node (hereinafter also referred to as “SN”) NR-NR dual connectivity, That is, it supports NR-DC.
  • MN master node
  • SN secondary node
  • the user apparatus 20 simultaneously uses a plurality of component carriers provided by the base station apparatus 10A that is the master node and the base station apparatus 10B that is the secondary node, and the base station apparatus 10A that is the master node and the base that is the secondary node. It is possible to perform simultaneous transmission or simultaneous reception with the station device 10B.
  • the master node may add a cell by CA to provide a master cell group (hereinafter, also referred to as “MCG (Master Cell Group)”), or the secondary node may add a cell by CA to make a secondary cell.
  • MCG Master Cell Group
  • a group hereinafter, also referred to as “SCG (Secondary Cell Group)” may be provided.
  • the user equipment 20 may communicate with the base station equipment 10A provided by the LTE system and the base station equipment 10B provided by the NR system. Further, the user equipment 20 may support LTE-NR dual connectivity, that is, EN-DC, in which the base station device 10A is the MN and the base station device 10B is the SN.
  • the user apparatus 20 simultaneously uses a plurality of component carriers provided by the base station apparatus 10A that is the master node and the base station apparatus 10B that is the secondary node, and the base station apparatus 10A that is the master node and the base that is the secondary node. It is possible to perform simultaneous transmission or simultaneous reception with the station device 10B.
  • the user equipment 20 may communicate with the base station equipment 10A provided by the NR system and the base station equipment 10B provided by the LTE system. Furthermore, the user equipment 20 may support NR-LTE dual connectivity, that is, NE-DC (NR-E-UTRA Dual Connectivity) in which the base station device 10A is the MN and the base station device 10B is the SN.
  • the user apparatus 20 simultaneously uses a plurality of component carriers provided by the base station apparatus 10A that is the master node and the base station apparatus 10B that is the secondary node, and the base station apparatus 10A that is the master node and the base that is the secondary node. It is possible to perform simultaneous transmission or simultaneous reception with the station device 10B.
  • the user equipment 20 is limited to the above dual connectivity.
  • the present invention is applicable to dual connectivity between a plurality of wireless communication systems using different RATs, that is, MR-DC.
  • Fast recovery is, for example, a method of using the link and split SRB (Split signaling radio bearer) of the secondary cell group for recovery from a failure in the master cell group.
  • link and split SRB Split signaling radio bearer
  • NGEN-DC NG-RANE-UTRA-NR Dual Connectivity
  • eNB that is a master node
  • gNB that is a secondary node connected to 5GC.
  • SCG failure supports the following cases 1)-4).
  • 1) RLF in SCG 2) SN change failure 3) SCG setting failure in SRB3 in EN-DC, NGEN-DC or NR-DC 4) SCG integrity check failure in SRB3 in EN-DC, NGEN-DC or NR-DC
  • the user device 20 When the RLF is detected in the SCG, the user device 20 suspends the transmission of all radio bearers in the SCG, and transmits “SCG Failure Information” to the MN instead of reestablishing the connection.
  • SCG Failure Information When an SCG failure occurs, the user equipment 20 maintains the current measurement settings of both the MN and SN, and if possible continues measurement based on the measurement settings. Measurements at the SN are reported via the MN after the SCG failure.
  • the user device 20 includes the measurement result based on the current measurement settings of both MN and SN in the SCG failure information message.
  • the MN processes the SCG failure information message and decides whether to keep, change or release the SN or SCG.
  • the measurement results based on SN settings and SCG failure types may be forwarded to the old SN and/or the new SN.
  • Cases of cell group failure in MR-DC are as follows 1)-3).
  • the SCG failure type may be information indicating any of cases 1) to 3). 1) Only SCG failure occurs 2) Only MCG failure occurs 3) Both MCG failure and SCG failure occur
  • MCG failure only MCG is recovered while continuing communication with SCG as a fast recovery function.
  • RRC connection re-establishment is executed.
  • MCG measurement continues. After the MN receives the MCG failure information, the MN decides whether to maintain or change the MCG, or the MN performs an intra-RAT handover or an inter-RAT handover to switch the SCG to the MCG.
  • FIG. 3 is a sequence diagram for explaining the first operation example (1) in the embodiment of the present invention. A procedure for changing the MN by handover when an MCG failure occurs in EN-DC will be described with reference to FIG.
  • the SN 10A shown in FIG. 3 is a gNB, and the MN 10B is an eNB.
  • step S10 the UE 20 detects an MCG failure (MCG failure). Then, UE20 transmits MCG failure information (MCG failure information) to MN10B (S11). In step S12, the UE 20 may send a measurement report (Measurement report) to the MN 10B.
  • MCG failure information and the measurement report may be transmitted to the MN 10B via the SN 10A via the SRB 1 to which the split SRB is applied, or may be transmitted to the MN 10B via the SN 10A via the SRB3.
  • step S13 based on the MCG failure information, the MN 10B performs intra-RAT handover by RRC synchronization reconfiguration (RRC reconfiguration with sync) or inter-RAT handover by mobility from E-UTRA (mobility from E-UTRA). Instruct the UE 20. Then, the UE 20 executes handover and transmits RRC reconfiguration complete to the new MN 10C of E-UTRA or NR (S14).
  • RRC synchronization reconfiguration RRC reconfiguration with sync
  • E-UTRA mobility from E-UTRA
  • FIG. 4 is a sequence diagram for explaining the first operation example (2) in the embodiment of the present invention.
  • the procedure for changing the SN to the master node when an MCG failure occurs in EN-DC will be described with reference to FIG.
  • the SN 10A shown in FIG. 4 is a gNB or an eNB, and the MN 10B is an eNB.
  • step S20 the UE 20 detects an MCG failure. Then, UE20 transmits MCG failure information (MCG failure information) to MN10B (S21). In step S22, the UE 20 may send a measurement report (Measurement report) to the MN 10B.
  • MCG failure information and the measurement report may be transmitted to the MN10B via the SN10A via the SRB1 to which the split SRB is applied, or may be transmitted to the MN10B via the SN10A via the SRB3. May be.
  • step S23 the MN 10B performs intra-RAT handover by RRC synchronization reconfiguration (RRC reconfiguration with sync) or inter-RAT handover by mobility (mobility from E-UTRA) from E-UTRA based on the MCG failure information. Instruct the UE 20. Subsequently, the UE 20 transmits RRC reconfiguration complete to the SN 10A of E-UTRA or NR (S24). In step S25, the SN 10A becomes an eNB or a gNB and operates as an MN.
  • RRC synchronization reconfiguration RRC reconfiguration with sync
  • mobility mobility from E-UTRA
  • FIG. 5 is a flow chart for explaining the first operation example (1) in the embodiment of the present invention. A detailed procedure executed when an MCG failure occurs in EN-DC will be described with reference to FIG.
  • step S30 the user device 20 detects that an MCG failure has occurred in the EN-DC, and proceeds to step S31 or step S33 depending on the communication environment or the measurement result.
  • step S31 the PCell (Primary Cell) is changed to another E-UTRA cell by Intra-RAT handover (RRC connection reconfiguration with mobility control information). Subsequently, the user apparatus 20 continues the EN-DC by handing over only the E-UTRA-PCell while keeping the NR-SN connected (S32).
  • PCell Primary Cell
  • Intra-RAT handover RRC connection reconfiguration with mobility control information
  • step S33 PCell is changed to an NR cell by inter-RAT handover (mobility from E-UTRA) from E-UTRA to NR. Then, it is determined whether the network is compatible with NR-DC (S34). If the network supports NR-DC (YES in S34), the process proceeds to step S35, and if the network does not support NR-DC (NO in S34), the process proceeds to step S36. In step S35, the user apparatus 20 hands over to the NR-PCell with the NR-SN still connected, and starts the NR-DC. On the other hand, in step S36, the user apparatus 20 releases the NR-SN and hands over to the NR-PCell. Any of the SCG cells may be the PCell.
  • FIG. 6 is a flowchart for explaining the first operation example (2) in the embodiment of the present invention. A detailed procedure executed when an MCG failure occurs in the NE-DC will be described with reference to FIG.
  • step S40 the user device 20 detects that an MCG failure has occurred in the NE-DC, and proceeds to step S41 or step S43 depending on the communication environment or measurement result.
  • step S41 the PCell (Primary Cell) is changed to another NR cell by Intra-RAT handover (RRC connection reconfiguration with sync). Then, the user apparatus 20 continues the NE-DC by handing over only the NR-PCell while keeping the E-UTRA-SN connected (S42).
  • PCell Primary Cell
  • Intra-RAT handover RRC connection reconfiguration with sync
  • step S43 PCell is changed to an E-UTRA cell by inter-RAT handover (mobility from NR) from NR to E-UTRA. Then, the network determines whether or not it is compatible with E-UTRA-DC (S44). If the network supports E-UTRA-DC (YES in S44), the process proceeds to step S45. If the network does not support E-UTRA-DC (NO in S44), the process proceeds to step S46. In step S45, the user equipment 20 hands over to the E-UTRA-PCell with the E-UTRA-SN still connected, and starts the E-UTRA-DC. On the other hand, in step S46, the user apparatus 20 releases the E-UTRA-SN and hands over to the NR-PCell. Any of the SCG cells may be the PCell.
  • FIG. 7 is a flowchart for explaining the first operation example (3) in the embodiment of the present invention. A detailed procedure executed when an MCG failure occurs in NR-DC will be described with reference to FIG. 7.
  • step S50 the user device 20 detects that an MCG failure has occurred in the NR-DC, and proceeds to step S51 or step S53 depending on the communication environment or the measurement result.
  • step S51 PCell (Primary Cell) is changed to another NR cell by Intra-RAT handover (RRC connection reconfiguration with sync). Then, the user apparatus 20 continues the NR-DC by handing over only the NR-PCell while keeping the NR-SN connected (S52).
  • PCell Primary Cell
  • Intra-RAT handover RRC connection reconfiguration with sync
  • step S53 PCell is changed to an E-UTRA cell by inter-RAT handover (mobility from NR) from NR to E-UTRA. Then, it is determined whether the network is compatible with NGEN-DC (S54). If the network supports NGEN-DC (YES in S54), the process proceeds to step S55, and if the network does not support NGEN-DC (NO in S54), the process proceeds to step S56.
  • step S55 the user apparatus 20 hands over to the E-UTRA-PCell with the NR-SN still connected, and starts NGEN-DC.
  • step S56 the user apparatus 20 releases the NR-SN and hands over to the E-UTRA-PCell.
  • FIG. 8 is a specification modification example (1) according to the first operation example in the embodiment of the present invention.
  • MCG failures are handled.
  • the following cases 1)-5) are supported.
  • the MCG failure type may be information indicating any of Cases 1)-5).
  • 1) RLF in MCG 2) MCG synchronization reconfiguration failure 3) Mobility failure from NR 4) RRC connection reconfiguration failure in SRB1 5) Integrity check failure in SRB1 or SRB2
  • the UE having the fast recovery function suspends the transmission in the MCG and sends the MCG failure information “MCG Failure Information” to the MN instead of reestablishing the connection.
  • MCG failure information may be transmitted by the SRB1 via the SCG regardless of the setting of the SRB3.
  • MCG failure information may be transmitted by SRB3.
  • the SN transfers the MCG failure information to the MN.
  • the user equipment 20 maintains the current measurement settings of both the MN and SN, and continues measurement based on the measurement settings if possible. Measurements at the SN are reported via the MN after the SCG failure.
  • the user device 20 includes the measurement result based on the current measurement settings of both MN and SN in the MCG failure information message.
  • the MN processes the MCG failure information message and decides whether to keep, change or release the MN or MCG.
  • the measurement results based on MN configuration and MCG failure type may be forwarded to the old MN and/or the new MN.
  • FIG. 9 is a specification modification example (2) according to the first operation example in the embodiment of the present invention.
  • the UE may send MCG failure information (MCGFailureInformationNR) to the master node in E-UTRAN, ie EN-DC or NGEN-DC.
  • MCG failure information MCGFailureInformationNR
  • FIG. 10 is a specification modification example (3) according to the first operation example in the embodiment of the present invention.
  • the MCG failure information is transmitted.
  • the UE 20 stops a predetermined timer and suspends all transmissions in the MCG.
  • the processing of the part surrounded by the broken line namely, 1) Release the SCell of the configured MCG 2) Apply the default physical channel configuration to the MCG 3) Apply the default semi-persistent scheduling configuration to the MCG 4) Apply the default MAC main configuration to the MCG 5) Configuration
  • the idc-config that has been performed, that is, the processing of 1)-5) for releasing the setting related to intra-device interference may or may not be executed. Then, the UE 20 starts transmitting the MCG failure information.
  • FIG. 11 is a specification modification example (4) according to the first operation example in the embodiment of the present invention.
  • the UE 20 sets the content of the MCG failure information.
  • a failure type FailureType
  • a measurement result measResultBestNeighCell, measResultNeighCells , measResultListEUTRA
  • FIG. 12 is a specification modification example (5) according to the first operation example in the embodiment of the present invention.
  • failure types (FailureType) 1)-9) below may be determined and included in the MCG failure information.
  • Timer T310 expires (T310 is a timer for detecting a physical layer failure of PCell) 2) Failure of random access 3) RLC retransmission count exceeded 4)
  • Timer T312 expires (T312 is a timer that triggers a measurement report during T310 operation)
  • FIG. 13 is a specification modification example (6) according to the first operation example in the embodiment of the present invention.
  • the information element of the MCG failure information “MCGFailureInformation” is configured.
  • the "MCGFailureInformation” is transmitted from the UE 20 to the E-UTRAN via the signaling radio bearer SRB1.
  • FIG. 14 is a specification modification example (7) according to the first operation example in the embodiment of the present invention.
  • the UE may send MCG Failure Information to the master node in the network, ie NE-DC or NR-DC.
  • FIG. 15 is a specification modification example (8) according to the first operation example in the embodiment of the present invention.
  • MCG failure information is transmitted.
  • the UE 20 stops a predetermined timer and suspends all transmissions in the MCG.
  • the processing of the part surrounded by the broken line that is, 1) Release the SCell of the configured MCG 2) Release the current dedicated serving cell configuration 3) Release the setting related to the prohibition timer related to reporting delay 4) Release the setting related to the prohibition timer related to assistance information reporting
  • the processes 1)-4) may or may not be executed.
  • the UE 20 starts transmitting the MCG failure information.
  • FIG. 16 is a specification modification example (9) according to the first operation example in the embodiment of the present invention.
  • the UE 20 sets the content of the MCG failure information.
  • the failure type (FailureType) and the measurement result (measResultMCG, measResultFreqListNR) are included in the MCG failure information.
  • FIG. 17 is a specification modification example (10) according to the first operation example in the embodiment of the present invention.
  • failure types (FailureType) 1) to 8) below may be determined and included in the MCG failure information.
  • Timer T310 expires T310 is a timer for detecting a physical layer failure of PCell
  • Random access failure 3) RLC retransmission count excess
  • NR RRC reconfiguration failure 5) E-UTRA RRC reconfiguration failure 6) RRC synchronization reconfiguration failure 7) NR mobility failure 8) Integrity check failure
  • the failure type when the MCG is NR and the failure type when the MCG shown in FIG. 12 is E-UTRA may be different.
  • FIG. 18 is a specification modification example (11) according to the first operation example in the embodiment of the present invention.
  • the information element of MCG failure information “MCGFailureInformation” is configured.
  • the "MCGFailureInformation” is transmitted from the UE 20 to the network via the signaling radio bearer SRB1 or SRB3.
  • FIG. 19 is a specification modification example (12) according to the first operation example in the embodiment of the present invention. As shown in FIG. 19, the information element “MeasResult2NR” indicating the measurement result is included in the MCG failure information “MCGFailureInformation”.
  • FIG. 20 is a specification modification example (13) according to the first operation example in the embodiment of the present invention.
  • the MCG failure information “MCGFailureInformation” is transmitted to the network via the signaling radio bearer SRB1 or SRB3 by the information element “ULInformationTransferMRDC” used for transfer of information related to MR-DC.
  • FIG. 21 is a flowchart for explaining the second operation example (1) in the embodiment of the present invention.
  • An operation example when the UE 20 detects an MCG failure during EN-DC performed with the NR SN 10A and the E-UTRA MN 10B will be described with reference to FIG.
  • the RAT of the MN 10C which newly becomes the MN may be E-UTRA or NR.
  • the MN 10B is not limited to E-UTRA and may be NR.
  • step S100 the MN 10B sends an RRC reconfiguration to the UE 20.
  • the RRC reconfiguration includes information including MR-DC setup and MCG recovery valid.
  • the UE 20 transmits RRC reconfiguration completion to the MN 10B (S101).
  • step S102 the UE 20 detects an MCG failure.
  • UE20 transmits MCG failure information to MN10B (S103).
  • Step S103 may be executed in the same manner as the above-mentioned first operation example.
  • step S104 the UE 20 executes cell selection.
  • step S105 the random access procedure is executed in the UE 20 and the new MN 10C.
  • the UE 20 transmits the MCG recovery request (MCG recovery request) to the MN 10C (S106).
  • MCG recovery request is directly transmitted to the MN 10C via the CCCH (Common control channel) of SRB0.
  • the MN 10C transmits a UE context acquisition request (UE context retrieval request) to the MN 10B (S107).
  • the MN 10B transmits a UE context acquisition response (UE context retrieval response) to the MN 10C (S108).
  • step S109 the MN 10C transmits MCG recovery (MCG recovery) to the UE 20.
  • MCG recovery is directly transmitted from the MN 10C via the DCCH (Dedicated control channel) of SRB1.
  • UE20 transmits MCG recovery completion (MCG recovery complete) to MN10C.
  • MCG recovery completion is directly transmitted to the MN 10C via the DCCH of SRB1.
  • FIG. 22 is a specification modification example (1) according to the second operation example in the embodiment of the present invention.
  • the UE 20 starts the MCG recovery procedure after reporting the MCG failure information.
  • the MCG recovery procedure is executed by the UE 20 and the new MN 10, and the SN is not related to the procedure.
  • FIG. 23 is a flowchart for explaining the second operation example (2) in the embodiment of the present invention.
  • An operation example when the UE 20 detects an MCG failure during EN-DC performed with the NR SN 10A and the E-UTRA MN 10B will be described with reference to FIG.
  • the RAT of the MN 10C which newly becomes the MN may be E-UTRA or NR.
  • the MN 10B is not limited to E-UTRA and may be NR.
  • step S200 the MN 10B sends an RRC reconfiguration to the UE 20.
  • the RRC reconfiguration includes information including MR-DC setup and MCG recovery valid.
  • the UE 20 transmits RRC reconfiguration completion to the MN 10B (S201).
  • step S202 the UE 20 detects an MCG failure.
  • UE20 transmits MCG failure information to MN10B (S203).
  • Step S203 may be executed in the same manner as the above-mentioned first operation example.
  • step S204 the UE 20 executes cell selection. Subsequently, the UE 20 transmits the MCG recovery request (MCG recovery request) to the MN 10C (S205). The MCG recovery request is transmitted to SN 10A via SRB3. Then, the SN 10A transmits an RRC message including the encapsulated MCG recovery request to the MN 10C (S206). The MN 10C transmits a UE context acquisition request (UE context retrieval request) to the MN 10B (S207). Then, the MN 10B transmits a UE context acquisition response (UE context retrieval response) to the MN 10C (S208).
  • MCG recovery request MCG recovery request
  • S205 MCG recovery request
  • the MCG recovery request is transmitted to SN 10A via SRB3.
  • the SN 10A transmits an RRC message including the encapsulated MCG recovery request to the MN 10C (S206).
  • the MN 10C transmits a UE context acquisition request (UE context retrieval request) to the
  • step S209 the MN 10C transmits an RRC message including the encapsulated MCG recovery to the SN 10A.
  • step S210 SN 10A transmits MCG recovery (MCG recovery) to UE 20. The MCG recovery is transmitted from SN 10A via SRB3. Then, UE20 transmits MCG recovery completion (MCG recovery complete) to SN10A (S211). The MCG recovery completion is transmitted to SN 10A via SRB3.
  • step S212 the SN 10A transmits an RRC message including the encapsulated MCG recovery completion to the MN 10C. Then, the random access procedure is executed in the UE 20 and the new MN 10C (S213). With the above procedure, MCG recovery is completed.
  • FIG. 24 is a specification modification example (2) according to the second operation example in the embodiment of the present invention.
  • the UE 20 starts the MCG recovery procedure after reporting the MCG failure information.
  • the MCG recovery procedure is executed by the UE 20 and the new MN 10 via the SRB 3 of the SN 10.
  • FIG. 25 is a flowchart for explaining the second operation example (3) in the embodiment of the present invention.
  • An operation example when the UE 20 detects an MCG failure during EN-DC performed with the NR SN 10A and the E-UTRA MN 10B will be described with reference to FIG.
  • the RAT of the MN 10C which newly becomes the MN may be E-UTRA or NR.
  • the MN 10B is not limited to E-UTRA and may be NR.
  • step S300 the MN 10B sends an RRC reconfiguration to the UE 20.
  • the RRC reconfiguration includes information including MR-DC setup and MCG recovery valid.
  • the UE 20 transmits RRC reconfiguration completion to the MN 10B (S301).
  • step S302 the UE 20 detects an MCG failure.
  • UE20 transmits MCG failure information to MN10B (S303).
  • Step S303 may be executed in the same manner as the above-mentioned first operation example.
  • step S304 the UE 20 executes cell selection. Subsequently, the UE 20 transmits the MCG recovery request (MCG recovery request) to the MN 10C (S305). The MCG recovery request is transmitted to SN 10A via SRB3. Then, the SN 10A transmits an RRC message including the encapsulated MCG recovery request to the MN 10C (S306). The MN 10C transmits a UE context acquisition request (UE context retrieval request) to the MN 10B (S307). Next, the MN 10B transmits a UE context acquisition response (UE context retrieval response) to the MN 10C (S308).
  • MCG recovery request MCG recovery request
  • S305 MCG recovery request
  • the MCG recovery request is transmitted to SN 10A via SRB3.
  • the SN 10A transmits an RRC message including the encapsulated MCG recovery request to the MN 10C (S306).
  • the MN 10C transmits a UE context acquisition request (UE context retrieval request
  • the MN 10C transmits an RRC message including the encapsulated MCG recovery to the SN 10A.
  • the SN 10A transmits MCG recovery (MCG recovery) to the UE 20.
  • MCG recovery is transmitted from SN 10A via SRB3.
  • the random access procedure is executed in the UE 20 and the new MN 10C (S311).
  • UE20 transmits MCG recovery completion (MCG recovery complete) to SN10A (S312).
  • MCG recovery completion is directly transmitted to the MN 10C via SRB1. With the above procedure, MCG recovery is completed.
  • FIG. 26 is a specification modification example (3) according to the second operation example in the embodiment of the present invention.
  • the UE 20 starts the MCG recovery procedure after reporting the MCG failure information.
  • the MCG recovery procedure is executed by the UE 20 and the new MN 10 via the SRB 3 of the SN 10. However, the MCG recovery completion is directly transmitted to the new MN 10 via the SRB 1.
  • FIG. 27 is a flowchart for explaining the second operation example (4) in the embodiment of the present invention.
  • An operation example in the case where the UE 20 detects an MCG failure during EN-DC performed with the NR SN 10A and the E-UTRA MN 10B will be described with reference to FIG.
  • the RAT of the MN 10C which newly becomes the MN may be E-UTRA or NR.
  • the MN 10B is not limited to E-UTRA and may be NR.
  • step S400 the MN 10B sends an RRC reconfiguration to the UE 20.
  • the RRC reconfiguration includes information including MR-DC setup and MCG recovery valid.
  • the UE 20 transmits RRC reconfiguration completion to the MN 10B (S401).
  • step S402 the UE 20 detects an MCG failure.
  • UE20 transmits MCG failure information to MN10B (S403).
  • Step S403 may be executed in the same manner as the first operation example described above.
  • step S404 the UE 20 executes cell selection. Subsequently, the UE 20 transmits the MCG recovery request (MCG recovery request) to the MN 10B (S405).
  • MCG recovery request is transmitted to the MN 10B via the SRB 1 of the SCG to which the split SRB is applied.
  • the MN 10C transmits a UE context acquisition request (UE context retrieval request) to the MN 10B (S406).
  • the MN 10B transmits a UE context acquisition response (UE context retrieval response) to the MN 10C (S407).
  • step S408 the MN 10B transmits MCG recovery (MCG recovery) to the UE 20.
  • MCG recovery is transmitted from the MN 10B via the SRB 1 of the SCG to which the split SRB is applied.
  • the random access procedure is executed in the UE 20 and the new MN 10C (S409).
  • UE20 transmits MCG recovery completion (MCG recovery complete) to MN10C (S410).
  • MCG recovery completion is directly transmitted to the MN 10C via the DCCH of SRB1.
  • FIG. 28 is a specification modification example (4) according to the second operation example in the embodiment of the present invention.
  • the UE 20 starts the MCG recovery procedure after reporting the MCG failure information.
  • the MCG recovery procedure is executed by the UE 20 and the new MN 10 via the SRB 1 which is the split SRB of the SN 10. However, the MCG recovery completion is directly transmitted to the new MN 10 via the SRB 1.
  • FIG. 29 is a specification modification example (5) according to the second operation example in the embodiment of the present invention.
  • the MCG recovery request (MCGRecoveryRequest) is transmitted from the UE to the E-UTRAN, and the MCG recovery (MCGRecovery) is transmitted from the E-UTRAN to the UE in response to the MCG recovery request. To be done. Then, MCG Recovery Complete is transmitted from the UE to the E-UTRAN.
  • an MCG recovery request (MCGRecoveryRequest) is transmitted from the UE to the E-UTRAN, and an MCG recovery rejection (MCGRecoveryReject) is sent from the E-UTRAN as a response to the MCG recovery request. Sent to the UE.
  • FIG. 30 shows a specification modification example (6) according to the second operation example in the embodiment of the present invention.
  • the MCG recovery procedure is executed only when AS security is enabled.
  • the UE 20 transits to the idle state for the reason “other”.
  • the UE 20 enters the idle state as a reason (cause) “RRC connection failure (RRC connection failure)”. Transition with.
  • FIG. 31 is a specification modification example (7) according to the second operation example in the embodiment of the present invention.
  • the following 1)-7) may be performed by the UE 20.
  • a predetermined timer is stopped.
  • All transmission/reception in MCG except SRB0 is interrupted.
  • MCG-MAC is reset.
  • the SCell set in the MCG is released.
  • the default semi-persistent scheduling settings are applied to the MCG unless the UE 20 is NB-IoT. 6) Default MAC main settings are applied to MCG. 7) Cell selection is performed.
  • FIG. 32 is a specification modification example (8) according to the second operation example in the embodiment of the present invention.
  • the UE 20 may send an MCG recovery request when performing cell selection. For example, even when the UE 20 returns to the source PCell, the UE 20 may send the MCG recovery request.
  • FIG. 33 is a specification modification example (9) according to the second operation example in the embodiment of the present invention.
  • the UE 20 may include the following contents 1) to 3) in the information element ue-Identity included in the MCG recovery request message. 1) C-RNTI at PCell 2) PCell physical cell identifier (physCellId) 3) LSB 16 bits of MAC-I calculated by a predetermined method
  • the UE 20 may include the content of the following 1) or 2) in the information element “reestabishmentCause” included in the MCG recovery request message. 1) The value reconfigurationFailurere if the MCG recovery procedure is initiated due to a reconfiguration failure. 2) If the MCG recovery procedure was initiated due to a reconfiguration with sync failure, the value handoverFailure
  • FIG. 34 is a specification modification example (10) according to the second operation example in the embodiment of the present invention.
  • the UE 20 when the UE 20 receives the MCG recovery, the UE 20 stops the predetermined timer and determines the current cell to be the PCell. Furthermore, the UE 20 reestablishes PDCP and RLC for SRB1. Further, the UE 20 performs radio resource setting and security setting, and transmits MCG recovery completion.
  • FIG. 35 is a specification modification example (11) according to the second operation example in the embodiment of the present invention. As shown in FIG. 35, when the timer T3XY expires, the cause is set to “RRC connection failure” and the state transits from the RRC_CONNECTED state.
  • FIG. 36 is a specification modification example (12) according to the second operation example in the embodiment of the present invention.
  • the information element “UL-CCCH-Message” is set.
  • the “UL-CCCH-Message” includes the information element “mcgRecoveryRequest” and is transmitted from the UE 20 to the E-UTRAN via the CCCH.
  • FIG. 37 is a specification modification example (13) according to the second operation example in the embodiment of the present invention.
  • the information element “UL-DCCH-Message” is set.
  • the “UL-DCCH-Message” includes an information element “mcgRecoveryRequest” and an information element “mcgRecoveryComplete”, and is transmitted from the UE 20 to the E-UTRAN via the DCCH.
  • FIG. 38 is a specification modification example (14) according to the second operation example in the embodiment of the present invention. As shown in FIG. 38, the information element “MCGRecovery” is set. The "MCG Recovery” is transmitted from the E-UTRAN to the UE 20 via the SRB1.
  • FIG. 39 is a specification modification example (15) according to the second operation example in the embodiment of the present invention. As shown in FIG. 39, the information element “MCGRecoveryComplete” is set. “MCGRecoveryComplete” is transmitted from the UE 20 to the E-UTRAN via the SRB1.
  • FIG. 40 is a specification modification example (16) according to the second operation example in the embodiment of the present invention. As shown in FIG. 40, the information element “MCGRecoveryRequest” is set. The "MCG Recovery Request” is transmitted from the UE 20 to the E-UTRAN via SRB0 or SRB1.
  • FIG. 41 is a specification modification example (17) according to the second operation example in the embodiment of the present invention. As shown in FIG. 41, when T304 expires and when the SCG failure has not occurred, the MCG recovery procedure is started. T304 is a timer used for handover control.
  • FIG. 42 is a specification modification example (18) according to the second operation example in the embodiment of the present invention.
  • an MCG recovery request (MCGRecoveryRequest) is transmitted from the UE to the network
  • MCG recovery (MCGRecovery) is transmitted from the network to the UE as a response to the MCG recovery request.
  • MCG Recovery Complete (MCGRecoveryComplete) is transmitted from the UE to the network.
  • an MCG recovery request (MCGRecoveryRequest) is transmitted from the UE to the network, and RRC setup (RRCSetup) is transmitted from the network to the UE as a response to the MCG recovery request. Sent to. Then, RRC Setup Complete is transmitted from the UE to the network.
  • FIG. 43 is a specification modification example (19) according to the second operation example in the embodiment of the present invention.
  • the MCG recovery procedure is executed only when AS security is enabled.
  • the UE 20 transits to the idle state for the reason “other”.
  • the UE 20 enters the idle state as a reason (cause) “RRC connection failure (RRC connection failure)”. Transition with.
  • FIG. 44 is a specification modification example (20) according to the second operation example in the embodiment of the present invention.
  • the following 1)-6) may be performed by the UE 20 when the MCG recovery procedure is started. 1) A predetermined timer is stopped. 2) All transmission/reception in MCG except SRB0 is interrupted. 3) MCG-MAC is reset. 4) The SCell set in the MCG is released. 5) The individual serving cell settings set in the MCG are released. 6) Cell selection is executed.
  • FIG. 45 is a specification modification example (21) according to the second operation example in the embodiment of the present invention.
  • UE20 when performing cell selection, may transmit an MCG recovery request. For example, even when the UE 20 returns to the source PCell, the UE 20 may send the MCG recovery request.
  • FIG. 46 is a specification modification example (22) according to the second operation example in the embodiment of the present invention.
  • the UE 20 may include the following contents 1) to 3) in the information element ue-Identity included in the MCG recovery request message. 1) C-RNTI at PCell 2) PCell physical cell identifier (physCellId) 3) LSB 16 bits of MAC-I calculated by a predetermined method
  • the UE 20 may include the content of 1) or 2) below in the information element “restartmentCause” included in the MCG recovery request message.
  • the value reconfigurationFailurere if the MCG recovery procedure is initiated due to a reconfiguration failure. 2) If the MCG recovery procedure was initiated due to a reconfiguration with sync failure, the value handoverFailure
  • FIG. 47 is a specification modification example (23) according to the second operation example in the embodiment of the present invention. As shown in FIG. 47, when the UE 20 receives the MCG recovery, it stops the predetermined timer and determines the current cell to be the PCell. Further, the UE 20 performs cell group setting and security setting, and transmits MCG recovery completion.
  • FIG. 48 is a specification modification example (24) according to the second operation example in the embodiment of the present invention. As shown in FIG. 48, when the timer T3XY expires, the cause is set to “RRC connection failure” and the state transits to the RRC_IDLE state.
  • FIG. 49 is a specification modification example (25) according to the second operation example in the embodiment of the present invention.
  • the information element “UL-CCCH-Message” is set.
  • the “UL-CCCH-Message” includes the information element “mcgRecoveryRequest” and is transmitted from the UE 20 to the network via the CCCH.
  • FIG. 50 is a specification modification example (26) according to the second operation example in the embodiment of the present invention.
  • the information element “UL-DCCH-Message” is set.
  • the “UL-DCCH-Message” includes the information element “mcgRecoveryRequest” and the information element “mcgRecoveryComplete”, and is transmitted from the UE 20 to the network via the DCCH.
  • FIG. 51 is a specification modification example (27) according to the second operation example in the embodiment of the present invention. As shown in FIG. 51, the information element “MCGRecoveryRequest” is set. The “MCG Recovery Request” is transmitted from the UE 20 to the network via SRB0 or SRB1.
  • FIG. 52 is a specification modification example (28) according to the second operation example in the embodiment of the present invention. As shown in FIG. 52, the information element “MCGRecovery” is set. The "MCG Recovery” is transmitted from the E-UTRAN to the UE 20 via the SRB1.
  • FIG. 53 is a specification modification example (29) according to the second operation example in the embodiment of the present invention. As shown in FIG. 53, the information element “MCGRecoveryComplete” is set. “MCGRecoveryComplete” is transmitted from the UE 20 to the network via the SRB1.
  • FIG. 54 is a specification modification example (30) according to the second operation example in the embodiment of the present invention.
  • the timer T3XX is started when the MCG recovery procedure is started, and stopped when a suitable NR cell or a cell of another RAT is selected.
  • the UE 20 makes a transition to RRC_IDLE.
  • the timer T3XY is started when transmitting the MCG recovery request, and stopped when the MCG recovery or RRC setup message is received and when the selected cell becomes unsuitable.
  • the timer T3XY expires, the UE 20 makes a transition to RRC_IDLE.
  • the user device 20 can continue the communication by using the SCG even after the MCG failure occurs, and can quickly recover the MCG by setting the MN.
  • the base station device 10 and the user device 20 include a function for implementing the above-described embodiment. However, each of the base station device 10 and the user device 20 may be provided with only a part of the functions in the embodiment.
  • FIG. 55 is a diagram showing an example of a functional configuration of the base station device 10 in the embodiment of the present invention.
  • the base station device 10 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140.
  • the functional configuration shown in FIG. 55 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the function classification and the names of the function units may be any names.
  • the transmitting unit 110 includes a function of generating a signal to be transmitted to the user device 20 side and wirelessly transmitting the signal. Further, the transmission unit 110 transmits the inter-network node message to another network node.
  • the reception unit 120 includes a function of receiving various signals transmitted from the user device 20 and acquiring, for example, information of a higher layer from the received signals. Further, the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, and the like to the user apparatus 20. In addition, the receiving unit 120 receives a message between network nodes from another network node.
  • the setting unit 130 stores preset setting information and various setting information to be transmitted to the user device 20.
  • the content of the setting information is, for example, information used for setting dual connectivity.
  • the control unit 140 performs control related to dual connectivity and control related to connection recovery processing, as described in the embodiment.
  • the functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the reception unit 120.
  • FIG. 56 is a diagram showing an example of a functional configuration of the user device 20 in the embodiment of the present invention.
  • the user device 20 includes a transmission unit 210, a reception unit 220, a setting unit 230, and a control unit 240.
  • the functional configuration shown in FIG. 56 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the function classification and the names of the function units may be any names.
  • the transmitter 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal.
  • the receiving unit 220 wirelessly receives various signals and acquires signals of higher layers from the received physical layer signals. Further, the receiving section 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals and the like transmitted from the base station apparatus 10.
  • the transmission unit 210 performs P2CH communication to other user apparatuses 20 by using PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), and PSBCH (Physical Sidelink Broadcast Channel). ) Etc., and the receiving part 120 receives PSCCH, PSSCH, PSDCH, PSBCH, etc. from the other user apparatus 20.
  • PSCCH Physical Sidelink Control Channel
  • PSSCH Physical Sidelink Shared Channel
  • PSDCH Physical Sidelink Discovery Channel
  • PSBCH Physical Sidelink Broadcast Channel
  • the setting unit 230 stores various setting information received from the base station device 10 by the receiving unit 220.
  • the setting unit 230 also stores preset setting information.
  • the content of the setting information is, for example, information related to the setting for executing dual connectivity.
  • control unit 240 performs control related to dual connectivity in the user device 20 and control related to connection recovery processing.
  • the functional unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the reception unit 220.
  • each functional block may be realized by using one device physically or logically coupled, or directly or indirectly (for example, two or more devices physically or logically separated). , Wired, wireless, etc.) and may be implemented using these multiple devices.
  • the functional block may be implemented by combining the one device or the plurality of devices with software.
  • Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, observation, Broadcasting, notifying, communicating, forwarding, configuration, reconfiguring, allocating, mapping, assigning, etc., but not limited to these.
  • I can't.
  • functional blocks (components) that function transmission are called a transmitting unit and a transmitter.
  • the implementation method is not particularly limited.
  • the base station device 10, the user device 20, and the like according to the embodiment of the present disclosure may function as a computer that performs the process of the wireless communication method of the present disclosure.
  • FIG. 57 is a diagram illustrating an example of a hardware configuration of the base station device 10 and the user device 20 according to the embodiment of the present disclosure.
  • the base station device 10 and the user device 20 described above are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. May be done.
  • the word “apparatus” can be read as a circuit, device, unit, or the like.
  • the hardware configurations of the base station device 10 and the user device 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.
  • Each function in the base station device 10 and the user device 20 causes a predetermined software (program) to be loaded onto hardware such as the processor 1001, the storage device 1002, etc., so that the processor 1001 performs an arithmetic operation and communication by the communication device 1004. It is realized by controlling or at least one of reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.
  • the processor 1001 operates an operating system to control the entire computer, for example.
  • the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, a calculation device, a register, and the like.
  • CPU central processing unit
  • the control unit 140, the control unit 240, and the like described above may be realized by the processor 1001.
  • the processor 1001 reads a program (program code), software module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes according to these.
  • a program that causes a computer to execute at least part of the operations described in the above-described embodiments is used.
  • the control unit 140 of the base station device 10 illustrated in FIG. 55 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001.
  • the control unit 240 of the user device 20 illustrated in FIG. 56 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001.
  • the various processes described above are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001.
  • the processor 1001 may be implemented by one or more chips.
  • the program may be transmitted from the network via an electric communication line.
  • the storage device 1002 is a computer-readable recording medium, and is, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (ElectricallyErasable Programmable ROM), RAM (Random Access Memory), and the like. It may be configured.
  • the storage device 1002 may be called a register, a cache, a main memory (main storage device), or the like.
  • the storage device 1002 can store an executable program (program code), a software module, or the like for implementing the communication method according to the embodiment of the present disclosure.
  • the auxiliary storage device 1003 is a computer-readable recording medium, and is, for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disc, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu disc). -Ray disk), smart card, flash memory (eg card, stick, key drive), floppy disk, magnetic strip, etc.
  • the above-described storage medium may be, for example, a database including at least one of the storage device 1002 and the auxiliary storage device 1003, a server, or another appropriate medium.
  • the communication device 1004 is hardware (transmission/reception device) for performing communication 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, 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: Frequency Division Duplex) and time division duplex (TDD). May be composed of
  • FDD Frequency Division Duplex
  • TDD time division duplex
  • the transmitter/receiver may be implemented by physically or logically separating the transmitter and the receiver.
  • the input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives 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 be integrated (for example, a touch panel).
  • each device such as the processor 1001 and the storage device 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 for each device.
  • the base station device 10 and the user device 20 include a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. It may be configured to include hardware, and the hardware may implement part or all of each functional block. For example, the processor 1001 may be implemented using at least one of these hardware.
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • PLD Programmable Logic Device
  • FPGA Field Programmable Gate Array
  • a communication unit that performs communication to which dual connectivity including a master cell group and a secondary cell group is applied, and a failure occurs in the master cell group.
  • the user device 20 can continue the communication by using the SCG even after the MCG failure occurs, and can quickly recover the MCG by setting the MN. That is, it is possible to promptly recover from the connection failure in the dual connectivity executed in the wireless communication system.
  • the transmission unit may transmit information requesting recovery from a failure in the master cell group to a handover destination master node via the secondary node via a signaling radio bearer set in the secondary node. ..
  • the user device 20 can transmit the MCG recovery request to the master node of the handover destination via the secondary node.
  • the transmission unit even if the information indicating the completion of recovery from the failure in the master cell group, via the signaling radio bearer set in the secondary node, to the master node of the handover destination via the secondary node Good.
  • the user device 20 can transmit the MCG recovery request to the master node of the handover destination via the secondary node.
  • the transmitting unit may transmit information requesting recovery from a failure in the master cell group to the handover source master node via the secondary node via the split signaling radio bearer.
  • the user device 20 can transmit the MCG recovery request to the master node of the handover source.
  • the transmitting unit may transmit information requesting recovery from a failure in the master cell group to the handover destination master node via a signaling radio bearer set in the handover destination master node.
  • the user device 20 can transmit the MCG recovery request to the master node of the handover destination.
  • a communication unit that performs communication to which dual connectivity including a master cell group and a secondary cell group is applied, and information that requests recovery from a failure in the master cell group. Based on information requesting recovery from a failure in the master cell group and a receiving unit that receives the information indicating the recovery from the failure in the master cell group signaling radio set in the secondary node of the secondary cell group. There is provided a base station apparatus having a transmitting unit that transmits to a user apparatus via the secondary node via a bearer.
  • the user device 20 can continue the communication by using the SCG even after the MCG failure occurs, and can quickly recover the MCG by setting the MN. That is, it is possible to promptly recover from the connection failure in the dual connectivity executed in the wireless communication system.
  • the operation of the plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by the plurality of components.
  • the order of processing may be changed as long as there is no contradiction.
  • the base station apparatus 10 and the user apparatus 20 have been described using functional block diagrams for convenience of processing description, such an apparatus may be realized by hardware, software, or a combination thereof.
  • the software operated by the processor included in the base station device 10 according to the embodiment of the present invention and the software operated by the processor included in the user device 20 according to the embodiment of the present invention are respectively a random access memory (RAM), a flash memory, and a read memory. It may be stored in a dedicated memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.
  • the notification of information is not limited to the mode/embodiment described in the present disclosure, and may be performed using another method.
  • information is notified by physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof, and RRC signaling may be called an RRC message, for example, RRC message. It may be a connection setup (RRC Connection Setup) message, an RRC connection reconfiguration message, or the like.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced
  • SUPER 3G IMT-Advanced
  • 4G 4th generation mobile communication system
  • 5G 5th generation mobile communication system
  • FRA Full Radio Access
  • NR new Radio
  • W-CDMA registered trademark
  • GSM registered trademark
  • CDMA2000 Code Division Multiple Access 2000
  • UMB Universal Mobile Broadband
  • IEEE 802.11 Wi-Fi (registered trademark)
  • IEEE 802.16 WiMAX (registered trademark)
  • IEEE 802.20 UWB (Ultra-WideBand
  • Bluetooth registered trademark
  • It may be applied to at least one of the next-generation systems.
  • a plurality of systems may be combined and applied (for example, a combination of at least one of LTE and LTE-A and 5G).
  • the specific operation that is assumed to be performed by the base station device 10 in this specification may be performed by its upper node in some cases.
  • various operations performed for communication with the user device 20 are other than the base station device 10 and the base station device 10. It is clear that it can be performed by at least one of the network nodes of (for example, but not limited to, MME or S-GW, etc.).
  • the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW). Good.
  • Information, signals, etc. described in the present disclosure may 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.
  • Information that has been input and output may be stored in a specific location (for example, memory), or may be managed using a management table. Information that is input/output may be overwritten, updated, or added. The output information and the like may be deleted. The input information and the like may be transmitted to another device.
  • the determination in the present disclosure may be performed by a value (0 or 1) represented by 1 bit, may be performed by a Boolean value (Boolean: true or false), and may be performed by comparing numerical values (for example, , Comparison with a predetermined value).
  • software, instructions, information, etc. may be transmitted and received via a transmission medium.
  • the software uses a wired technology (coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL: Digital Subscriber Line), etc.) and/or wireless technology (infrared, microwave, etc.) websites, When sent from a server, or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.
  • wired technology coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL: Digital Subscriber Line), etc.
  • wireless technology infrared, microwave, etc.
  • data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description include voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any of these. May be represented by a combination of
  • At least one of the channel and the symbol may be a signal (signaling).
  • the signal may also be a message.
  • a component carrier CC:Component Carrier
  • CC Component Carrier
  • system and “network” used in this disclosure are used interchangeably.
  • the information, parameters, etc. described in the present disclosure may be represented by using an absolute value, may be represented by using a relative value from a predetermined value, or by using other corresponding information. May be represented.
  • the radio resources may be those indicated by the index.
  • base station Base Station
  • radio base station base station
  • base station device fixed station
  • NodeB NodeB
  • eNodeB eNodeB
  • GNB NodeB
  • access point “transmission point”, “reception point”, “transmission/reception point”, “cell”, “sector”
  • a base station may be referred to by terms such as macro cell, small cell, femto cell, and pico cell.
  • a base station can accommodate one or more (eg, three) cells.
  • a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being defined by a base station subsystem (eg, indoor small base station (RRH: It is also possible to provide communication services by Remote Radio Head).
  • RRH indoor small base station
  • the term "cell” or “sector” means a part or the whole coverage area of at least one of the base station and the base station subsystem that perform communication services in this coverage. Refers to.
  • MS Mobile Station
  • UE User Equipment
  • Mobile stations are defined 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 transmission device, a reception device, a communication device, or the like.
  • the base station and the mobile station may be a device mounted on the mobile body, the 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 type or unmanned type).
  • At least one of the base station and the mobile station also includes a device that does not necessarily move during communication operation.
  • at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.
  • IoT Internet of Things
  • the base station in the present disclosure may be replaced by the user terminal.
  • the communication between the base station and the user terminal is replaced with communication between a plurality of user devices 20 (eg, may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.)
  • a plurality of user devices 20 eg, may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.
  • the user apparatus 20 may have the function of the above-described base station apparatus 10.
  • the wording such as “up” and “down” may be replaced with the wording corresponding to the terminal-to-terminal communication (for example, “side”).
  • the uplink channel and the downlink channel may be replaced with the side channel.
  • the user terminal in the present disclosure may be replaced by the base station.
  • the base station may have the function of the above-mentioned user terminal.
  • determining and “determining” as used in this disclosure may encompass a wide variety of actions.
  • “Judgment” and “decision” are, for example, judgment, calculating, computing, processing, deriving, investigating, and looking up, search, inquiry. (Eg, searching in a table, database, or another data structure), considering ascertaining as “judging” or “deciding”, and the like.
  • “decision” and “decision” include receiving (eg, receiving information), transmitting (eg, transmitting information), input (input), output (output), access (accessing) (for example, accessing data in a memory) may be regarded as “judging” and “deciding”.
  • judgment and “decision” are considered to be “judgment” and “decision” when things such as resolving, selecting, choosing, selecting, establishing, and comparing are done. May be included. That is, the “judgment” and “decision” may include considering some action as “judgment” and “decision”. In addition, “determination (decision)” may be read as “assuming”, “expecting”, “considering”, and the like.
  • connection means any direct or indirect connection or coupling between two or more elements, and It can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled”.
  • the connections or connections between the elements may be physical, logical, or a combination thereof.
  • connection may be read as “access”.
  • two elements are in the radio frequency domain, with at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-exhaustive examples. , Can be considered to be “connected” or “coupled” to each other, such as with electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions.
  • the reference signal may be abbreviated as RS (Reference Signal), or may be referred to as a pilot (Pilot) depending on the applied standard.
  • RS Reference Signal
  • Pilot pilot
  • the phrase “based on” does not mean “based only on,” unless expressly specified otherwise. In other words, the phrase “based on” means both "based only on” and “based at least on.”
  • references to elements using designations such as “first”, “second”, etc. used in this disclosure does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements may be employed, or that the first element must precede the second element in any way.
  • a radio frame may be composed of one or more frames in the time domain. Each frame or frames in the time domain may be referred to as a subframe. A subframe may also be composed of one or more slots in the time domain. A subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.
  • Numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel.
  • Numerology includes, for example, subcarrier spacing (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, radio frame configuration, transceiver At least one of specific filtering processing performed in the frequency domain and specific windowing processing performed by the transceiver in the time domain may be shown.
  • a slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain.
  • a slot may be a time unit based on numerology.
  • a slot may include multiple minislots. Each minislot may be composed of one or more symbols in the time domain. The minislot may also be called a subslot. Minislots may be configured with fewer symbols than slots.
  • a PDSCH (or PUSCH) transmitted in a time unit larger than a 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.
  • Radio frame, subframe, slot, minislot, and symbol all represent the time unit for signal transmission. Radio frames, subframes, slots, minislots, and symbols may have different names corresponding to them.
  • one subframe may be called a transmission time interval (TTI)
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI transmission time interval
  • TTI means, for example, a minimum time unit of scheduling in wireless communication.
  • the base station performs scheduling to allocate radio resources (frequency bandwidth that can be used in each user device 20, transmission power, etc.) to each user device 20 in units of TTI.
  • the definition of TTI is not limited to this.
  • the TTI may be a transmission time unit of a channel-encoded data packet (transport block), code block, codeword, or the like, or may be a processing unit of scheduling, link adaptation, or the like.
  • the time interval for example, the number of symbols
  • the transport block, code block, codeword, etc. may be shorter than the TTI.
  • one slot or one minislot is called a TTI
  • one or more TTIs may be the minimum time unit for scheduling.
  • the number of slots (the number of mini-slots) forming the minimum time unit of the scheduling may be controlled.
  • a TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
  • a TTI shorter than the normal TTI may be called 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.
  • a long TTI (eg, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and a short TTI (eg, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.
  • a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
  • the number of subcarriers included in the RB may be the same regardless of the numerology, and may be 12, for example.
  • the number of subcarriers included in the RB may be determined based on numerology.
  • the time domain of RB may include one or more symbols, and may be one slot, one minislot, one subframe, or one TTI in length.
  • One TTI, one subframe, etc. may be configured with one or a plurality of resource blocks.
  • One or more RBs are physical resource blocks (PRBs: Physical RBs), subcarrier groups (SCGs: Sub-Carrier Groups), resource element groups (REGs: Resource Element Groups), PRB pairs, RB pairs, etc. May be called.
  • PRBs Physical resource blocks
  • SCGs Sub-Carrier Groups
  • REGs Resource Element Groups
  • PRB pairs RB pairs, etc. May be called.
  • a resource block may be composed of one or more resource elements (RE: Resource Element).
  • RE Resource Element
  • 1 RE may be a radio resource area of 1 subcarrier and 1 symbol.
  • a bandwidth part (may also be called a partial bandwidth) may represent a subset of consecutive common RBs (common resource blocks) for a certain numerology in a certain carrier.
  • the common RB may be specified by the index of the RB based on the common reference point of the carrier.
  • PRBs may be defined in a BWP and numbered within the BWP.
  • BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP).
  • BWP for UL
  • DL BWP DL BWP
  • one or more BWPs may be set in one carrier.
  • At least one of the configured BWPs may be active, and the UE does not have to expect to send and receive a given signal/channel outside the active BWP.
  • “cell”, “carrier”, and the like in the present disclosure may be read as “BWP”.
  • the structure of the wireless frame, subframe, slot, minislot, symbol, etc. described above is just an example.
  • 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, and included in RBs The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP: Cyclic Prefix) length, and the like can be variously changed.
  • 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”.
  • the terms “remove”, “coupled” and the like may be construed similarly as “different”.
  • the notification of the predetermined information (for example, the notification of “being X”) is not limited to the explicit notification, and is performed implicitly (for example, the notification of the predetermined information is not performed). Good.
  • the transmission unit 210 and the reception unit 220 are examples of the communication unit.
  • the transmission unit 110 and the reception unit 120 are an example of a communication unit.
  • the MCG recovery request is an example of information requesting recovery from a failure in the master cell group.
  • MCG recovery completion is an example of information indicating completion of recovery from a failure in the master cell group.
  • SRB3 is an example of a signaling radio bearer set in the secondary node.
  • the split SRB1 is an example of a split signaling radio bearer.
  • MCG recovery is an example of information indicating recovery from a failure in the master cell group.
  • base station device 110 transmission unit 120 reception unit 130 setting unit 140 control unit 20 user device 210 transmission unit 220 reception unit 230 setting unit 240 control unit 1001 processor 1002 storage device 1003 auxiliary storage device 1004 communication device 1005 input device 1006 output device

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un dispositif utilisateur qui comprend : une unité de communication qui met en œuvre une communication dans laquelle une connectivité double, constituée par un groupe de cellules maître et un groupe de cellules secondaire, a été appliquée ; une unité de commande qui détecte la survenue d'une défaillance dans le groupe de cellules maître ; et une unité de transmission qui transmet, à un nœud maître, des informations qui demandent une reprise après une défaillance dans le groupe de cellules maître. Avec l'unité de communication dans un état de connexion continue avec un nœud secondaire du groupe de cellules secondaire, l'unité de commande change une cellule primaire à une autre cellule au moyen d'un transfert.
PCT/JP2019/005401 2019-02-14 2019-02-14 Dispositif utilisateur et dispositif de station de base WO2020166015A1 (fr)

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Citations (2)

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Publication number Priority date Publication date Assignee Title
KR20180049772A (ko) * 2016-11-03 2018-05-11 삼성전자주식회사 DSRC/IEEE 802.11p 와 LTE-V2X 공존을 위한 해결방법
WO2018128572A1 (fr) * 2017-01-06 2018-07-12 Telefonaktiebolaget Lm Ericsson (Publ) Nœuds de réseau radio, dispositif sans fil, et procédés associés mis en œuvre pour gérer des liaisons dans un réseau de communication sans fil

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KR20180049772A (ko) * 2016-11-03 2018-05-11 삼성전자주식회사 DSRC/IEEE 802.11p 와 LTE-V2X 공존을 위한 해결방법
WO2018128572A1 (fr) * 2017-01-06 2018-07-12 Telefonaktiebolaget Lm Ericsson (Publ) Nœuds de réseau radio, dispositif sans fil, et procédés associés mis en œuvre pour gérer des liaisons dans un réseau de communication sans fil

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