WO2021218644A1 - 网络切换方法、装置、设备及存储介质 - Google Patents

网络切换方法、装置、设备及存储介质 Download PDF

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Publication number
WO2021218644A1
WO2021218644A1 PCT/CN2021/087363 CN2021087363W WO2021218644A1 WO 2021218644 A1 WO2021218644 A1 WO 2021218644A1 CN 2021087363 W CN2021087363 W CN 2021087363W WO 2021218644 A1 WO2021218644 A1 WO 2021218644A1
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Prior art keywords
network
information
node
handover
source side
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PCT/CN2021/087363
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English (en)
French (fr)
Inventor
刘红军
马伟
李冬梅
文武
张博山
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中兴通讯股份有限公司
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Priority to US17/918,537 priority Critical patent/US20230345316A1/en
Priority to EP21795510.3A priority patent/EP4145903A4/en
Priority to KR1020227040345A priority patent/KR20230005238A/ko
Priority to AU2021265948A priority patent/AU2021265948A1/en
Publication of WO2021218644A1 publication Critical patent/WO2021218644A1/zh

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    • 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
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1443—Reselecting a network or an air interface over a different radio air interface technology between licensed networks
    • 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
    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • 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
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • 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
    • 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
    • H04W36/00838—Resource reservation for handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/03—Reselecting a link using a direct mode connection
    • H04W36/033—Reselecting a link using a direct mode connection in pre-organised networks
    • 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
    • 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
    • H04W36/00698—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using different RATs

Definitions

  • This application relates to the field of communication technologies, for example, to a network switching method, device, device, and storage medium.
  • the target of the User Equipment (UE) after the handover The 5th Generation mobile communication technology (5G) base station can connect to the evolved universal terrestrial radio before the handover.
  • the new radio-dual connectivity (Evolved Universal Terrestrial Radio Access) And the Secondary Node (SN) in the New Radio-Dual Connectivity (EN-DC) network is the same 5G base station, and the UE can continue to use the original radio resources.
  • the secondary node SN in the EN-DC network after the UE handover can be the same 5G base station as the 5G base station before the handover, and the UE can continue to use the original radio resources. How to make the 5G base station before the UE handover know that it is the same base station before and after the handover and reserve the radio resources of the UE is a problem that needs to be solved.
  • This application provides methods, devices, equipment, and storage media for network switching.
  • An embodiment of the present application provides a network handover method, which is applied to a first communication node, and includes: sending a handover demand message to a core network, wherein the handover demand message carries UE context reference information on the source side; receiving A handover control message sent by the core network, where the handover control message carries UE context retention information on the source side, wherein the UE context retention information on the source side is used to instruct the network node on the source side not to release the UE For used resources, the UE context holding information on the source side is determined by the UE context reference information on the source side.
  • An embodiment of the present application provides a network handover method, which is applied to a second communication node, and includes: receiving a handover request message sent by a core network, wherein the handover request message carries UE context reference information on the source side; Send a handover request notification message to the core network, where the handover request notification message carries UE context retention information on the source side, wherein the UE context retention information on the source side is used to indicate the network node on the source side Do not release the resources used by the UE.
  • the UE context retention information on the source side is determined by the UE context reference information on the source side.
  • the embodiment of the application provides a network handover method, which is applied to a third communication node, and includes: receiving a third message, wherein the third message carries radio resource indication information; and reserving the source cell according to the radio resource indication information Some or all of the wireless resources.
  • An embodiment of the present application provides a network switching device, which is configured in a first communication node and includes: a first sending module configured to send a handover demand message to a core network, wherein the handover demand message is carried in the source UE context reference information on the source side; the first receiving module is configured to receive a handover control message sent by the core network, wherein the handover control message carries UE context retention information on the source side, wherein the The UE context retention information is used to instruct the network node on the source side not to release the resources used by the UE, and the UE context retention information on the source side is determined by the UE context reference information on the source side.
  • An embodiment of the present application provides a network switching device, which is configured in a second communication node and includes: a second receiving module configured to receive a handover request message sent by a core network, wherein the handover request message is carried in UE context reference information on the source side; the second sending module is configured to send a handover request notification message to the core network, wherein the handover request notification message carries UE context retention information on the source side, wherein the The UE context retention information on the source side is used to instruct the network node of the source measurement not to release the resources used by the UE, and the UE context retention information on the source side is determined by the UE context reference information on the source side.
  • An embodiment of the present application provides a network switching device, which is configured in a third communication node and includes: a third receiving module configured to receive a third message, wherein the third message carries radio resource indication information;
  • the reservation module is configured to reserve part or all of the radio resources of the source cell according to the radio resource indication information.
  • An embodiment of the present application provides a device, the device includes: one or more processors; a memory for storing one or more programs; when the one or more programs are executed by the one or more processors At this time, the one or more processors are caused to implement any one of the methods in the embodiments of the present application.
  • the embodiment of the present application provides a storage medium that stores a computer program, and when the computer program is executed by a processor, any one of the methods in the embodiments of the present application is implemented.
  • Figure 1 is a schematic diagram of the 5G network architecture
  • FIG. 2 is a schematic diagram of the EN-DC architecture in related technologies
  • FIG. 3 is a schematic flowchart of a network handover method provided by an embodiment of this application.
  • FIG. 4 is a schematic flowchart of a network handover method provided by an embodiment of this application.
  • FIG. 5 is a schematic flowchart of a network handover method provided by an embodiment of this application.
  • FIG. 6 is a flowchart of the UE switching from a stand-alone (SA) 5G network to an EN-DC network provided by an embodiment of the present application;
  • SA stand-alone
  • FIG. 7 is a flowchart of the UE switching from the EN-DC network to the SA 5G network provided by an embodiment of the application;
  • FIG. 8 is a flowchart of a method for switching between 4G and 5G, and 5G SA/Non-Stand Alone (NSA) modes when a terminal initiates a voice call according to an embodiment of the application;
  • FIG. 9 is a flowchart of a method for switching between 4G and 5G, and 5G SA/NSA modes when a terminal initiates a voice call according to an embodiment of the application;
  • FIG. 10 is a flowchart of a method for switching between 4G and 5G, and 5G SA/NSA modes when a terminal initiates a voice call according to an embodiment of the application;
  • FIG. 11 is a flowchart of a method for switching between 4G and 5G, and 5G SA/NSA modes when a terminal initiates a voice call according to an embodiment of the application;
  • FIG. 12 is a flowchart of a method for switching between 4G and 5G, and 5G SA/NSA modes when a terminal initiates a voice call according to an embodiment of the application;
  • FIG. 13 is a flowchart of a method for a terminal to perform a network handover based on a measurement report of the current network according to an embodiment of the application;
  • FIG. 14 is a flowchart of a method for a terminal to perform network handover based on a measurement report of the current network according to an embodiment of the application;
  • 15 is a flowchart of a method for a terminal to perform network handover based on a measurement report of the current network according to an embodiment of the application;
  • 16 is a flowchart of a method for a terminal to perform network handover based on a measurement report of the current network according to an embodiment of the application;
  • FIG. 17 is a schematic structural diagram of a network switching device provided by an embodiment of this application.
  • FIG. 18 is a schematic structural diagram of a network switching device provided by an embodiment of this application.
  • FIG. 19 is a schematic structural diagram of a network switching device provided by an embodiment of this application.
  • FIG. 20 is a schematic structural diagram of a device provided by an embodiment of the present application.
  • the base station (NG-RAN node, next generation NodeB (gNB)) of the 5G network can support large-capacity services (such as Mobile Broad Band (MBB)).
  • Figure 1 is a schematic diagram of the 5G network architecture.
  • the 5G network includes a 5G core network (5G Core, 5GC) and a 5G base station gNB.
  • the 5GC includes network element nodes such as Access Mobility Function (AMF) nodes, Session Management Function (SMF) nodes, and User Plane Function (UPF) nodes.
  • AMF Access Mobility Function
  • SMF Session Management Function
  • UPF User Plane Function
  • the 5G base station is also called: gNB, Next Generation Radio Access Network (NG-RAN) node.
  • the 5G base station adopts a new physical layer air interface design.
  • the new physical layer air interface supports New Radio (NR), NR Radio Access Technology (RAT) standard base stations, and related base station network element interfaces.
  • the 5G base station is connected to the 5GC (including the next generation control plane (NG-C) (signaling) connection and the next generation user plane (Next Generation- User plane, NG-U) (user data) connection), and NG-RAN base stations (gNB or next generation-evolved NodeB (ng-eNB)) are connected to each other via Xn interface (including Xn control) A plane (Xn-Control plane, Xn-C) connection and an Xn user plane (Xn-User plane, Xn-U) connection).
  • 5G can provide MBB service, but 5G network may not support voice service (Voice service), that is, voice call interface (Voice over New Radio, VoNR) function under 5G access is not supported.
  • VoIP service voice service
  • VoNR voice call interface
  • the mobile terminal connected to the 5G network is also called User Equipment (UE), and needs to be switched to a 4G (Long Term Evolution (LTE)) network to establish voice services.
  • UE User Equipment
  • 4G Long Term Evolution
  • the 4G network generally Both support Voice over Long Term Evolution (VoLTE) functions.
  • the 4G network includes the 4G core network, namely the Evolved Packet Core (EPC) and the 4G Radio Access Network (Long Term Evolution Radio Access Network, LTE RAN).
  • EPC includes the Mobility Management Entity, Basic network element nodes such as MME) nodes, Serving Gateway (SGW) nodes, Public Data Network (PDN) Gateway (PGW) nodes, and 4G radio access network (Radio Access Network, RAN) )
  • MME Mobility Management Entity
  • SGW Serving Gateway
  • PGW Public Data Network
  • PGW Public Data Network Gateway
  • 4G radio access network Radio Access Network, RAN
  • FIG. 2 is a schematic diagram of the EN-DC architecture in related technologies.
  • a terminal is simultaneously connected to an eNB (4G base station, LTE base station) and acts as a master node (Master Node, MN) and is connected to a gNB ( 5G base station, NR base station) and as a secondary node (Secondary Node, SN).
  • This master node eNB is connected to the 4G core network EPC through the S1 interface, and is connected to the 5G base station through the X2 interface.
  • the 5G base station gNB can also be connected to the EPC through an S1 user plane (S1-User plane, S1-U) interface, and it can also be connected to other 5G base stations through an X2 user plane (X2-User plane, X2-U) interface.
  • S1-User plane S1-U
  • X2-User plane X2-U
  • the network mode in which two base stations (such as a 4G base station and a 5G base station in the EN-DC architecture) are tightly coupled to provide communication services for the UE is called Dual Connectivity (DC)
  • DC Dual Connectivity
  • the two base stations are further divided into a primary node (MN, also called a first network element) and a secondary node (SN, also called a second network element).
  • MN primary node
  • SN secondary node
  • the dual-connection network design can increase the communication capacity of a session.
  • the UE In the scenario where the UE switches from the SA 5G network to the EN-DC network, the UE was originally connected to the SA 5G network, and the UE is performing the MBB service. At this time, it needs to perform the voice service (such as answering a voice call or making a voice call) , But the 5G network cannot support voice services.
  • the UE needs to switch to the LTE network to establish the VoLTE service.
  • the UE needs to continue the original MBB service, so the UE switches to the EN-DC network and establishes VoLTE at the LTE RAN node (node) Connect, establish the original MBB service connection on the NG-RAN node.
  • S-MN Source-Master Node is LTE eNB
  • S-SN Source-Secondary Node
  • gNB also known as: NG-RAN node
  • the UE ends the VoLTE service such as hanging up the phone
  • 5G service such as broadband streaming media service, MBB service
  • MBB service broadband streaming media service
  • the secondary node (SN) in the EN-DC network after the UE handover and the SA 5G base station before the UE handover are the same and the same base station
  • a method is provided to make the UE work in the same 5G
  • the radio resources on the base station can continue to be used without being released.
  • a similar method is also provided for the above-mentioned second scenario.
  • the target 5G base station after the UE handover can learn that it is the same 5G base station as the source 5G base station before the handover, and the UE can continue to use the original radio resources.
  • the 5G base station before the UE handover can learn this and reserve the UE's radio resources.
  • the source base station before the UE handover will release the radio resources of the UE after learning that the UE handover is successful, so that the target 5G base station after the handover cannot continue to use the radio resources of the UE.
  • the embodiments of the present application provide a method, device, device, and storage medium for network handover, so that the target 5G base station after the UE handover can learn that it is the same 5G base station as the source 5G base station before the handover, and the UE can continue Use the original wireless resources.
  • an embodiment of the present application provides a network handover method
  • FIG. 3 is a schematic flowchart of a network handover method provided by an embodiment of the present application. This method can be applied to the situation where the UE continues to use the original radio resources before and after the network handover.
  • the method can be executed by the network switching device provided by the present application, and the network switching device can be implemented by software and/or hardware, and the method is applied to the first communication node.
  • the network switching method provided by the embodiment of the present application mainly includes steps S11 and S12.
  • S12 Receive a handover control message sent by the core network, where the handover control message carries UE context retention information on the source side, wherein the UE context retention information on the source side is used to instruct the network node on the source side not to The resources used by the UE are released, and the UE context retention information on the source side is determined by the UE context reference information on the source side.
  • the first communication node may be understood as a network node on the source side. If the network handover is a handover from the SA 5G network to the EN-DC network, the first communication node can understand the NG-RAN node in the SA 5G network. If the network handover is a handover from the EN-DC network to the SA 5G network, the first communication node can understand the secondary node in the EN-DC network, and the secondary node in the EN-DC network is also a 5G base station.
  • the method before receiving the switching control message sent by the core network, the method further includes: receiving a secondary communication node sent by the second communication node.
  • a node addition request message where the secondary node addition request message carries the UE context reference information on the source side; and a secondary node addition notification message is sent to the second communication node, wherein the secondary node addition notification message It is used to inform the target node that the UE establishes a dual connection under the EN-DC network.
  • the UE context reference information on the source side includes: a source next-generation radio access network node (Source NG-RAN node) and/or a radio access network user equipment NG interface application protocol identifier (Radio Access Network User Equipment Next Generation Application Protocol, RAN UE NGAP ID).
  • a source next-generation radio access network node Source NG-RAN node
  • a radio access network user equipment NG interface application protocol identifier Radio Access Network User Equipment Next Generation Application Protocol, RAN UE NGAP ID
  • the UE context reference information on the source side carried in the secondary node addition request message is sent by the core network to the second communication node.
  • the first communication node is a 5G base station in the SA 5G network
  • the second communication node is an EN-DC network.
  • the method further includes: sending the secondary node to the second communication node An addition request message, wherein the secondary node addition request message carries the UE context reference information on the source side; and the secondary node addition notification message sent by the second communication node is received, wherein the secondary node addition notification message is used for Inform the UE to establish a dual connection under the EN-DC network.
  • a third message is sent to the third communication node, where the third message carries radio resource indication information.
  • the method further includes: sending the UE release to the second communication node Message, wherein the UE release message is used to instruct the second communication node to release the signaling connection with the local node.
  • the UE context reference information on the source side includes: a secondary node user equipment X2 interface application protocol identifier (Secondary Node User Equipment X2 Application Protocol Identifier, SN UE X2AP ID) information element.
  • a secondary node user equipment X2 interface application protocol identifier Secondary Node User Equipment X2 Application Protocol Identifier, SN UE X2AP ID
  • the first communication node is the LTE eNB in the EN-DC network
  • the secondary node is the SA 5G network 5G base station in China.
  • an embodiment of the present application provides a network handover method
  • FIG. 4 is a schematic flowchart of a network handover method provided by an embodiment of the present application. This method can be applied to the situation where the UE continues to use the original radio resources before and after the network handover.
  • the method may be executed by the network switching device provided by the present application, and the network switching device may be implemented by software and/or hardware, and the method is applied to the second communication node.
  • the network switching method provided by the embodiment of the present application mainly includes steps S21 and S22.
  • S21 Receive a handover request message sent by a core network, where the handover request message carries UE context reference information on the source side.
  • the first communication node when the network handover is from the EN-DC network to the SA 5G network, the first communication node is the LTE eNB in the EN-DC network, and the secondary node is the 5G network in the SA 5G network.
  • Base station In the case where the network handover is a handover from a SA 5G network to an EN-DC network, the first communication node is a 5G base station in the SA 5G network, and the second communication node is an LTE eNB in the EN-DC network.
  • the method further includes: sending the secondary node to the first communication node An addition request message, wherein the secondary node addition request message carries the UE context reference information on the source side; receiving a secondary node addition notification message sent by the first communication node, wherein the secondary node addition notification message It is used to inform the target node that the UE establishes a dual connection under the EN-DC network.
  • the method further includes: receiving a secondary node addition request message sent by the first communication node, wherein the secondary node The node addition request message carries the UE context reference information on the source side; a secondary node addition notification message is sent to the first communication node, where the secondary node addition notification message is used to notify the UE to establish in the EN-DC network Double connection.
  • the method further includes: receiving a UE release message sent by the first communication node, wherein the UE release message Used to instruct the local node to release the signaling connection with the first communication node.
  • an embodiment of the present application provides a network handover method
  • FIG. 5 is a schematic flowchart of a network handover method provided by an embodiment of the present application. This method can be applied to the situation where the UE continues to use the original radio resources before and after the network handover.
  • the method may be executed by the network switching device provided in the present application, and the network switching device may be implemented by software and/or hardware, and the method is applied to the third communication node.
  • the network switching method provided by the embodiment of the present application mainly includes steps S31 and S32.
  • the third message is sent by the first communication node.
  • the third message is a radio resource control (Radio Resource Control, RRC) reconfiguration message, or the third message is a radio control message.
  • RRC Radio Resource Control
  • the radio resource indication information includes: source cell reservation indication information, or secondary cell information, or reserved protocol data unit (Protocol Data Unit, PDU) session information, or non-access stratum (Non -Access Stratum, NAS) resource reservation indication, or suspension indication, QoS flow reservation information.
  • source cell reservation indication information or secondary cell information
  • reserved protocol data unit Protocol Data Unit, PDU
  • non-access stratum Non -Access Stratum, NAS resource reservation indication
  • suspension indication QoS flow reservation information.
  • the QoS flow reservation information is used to instruct to reserve QoS flow or QoS flow information after the network is switched.
  • the source cell reservation indication information is used to instruct to reserve part or all of the radio resources of the source cell after the network handover.
  • part or all of the radio resources of the source cell are reserved.
  • the secondary cell information is information of a single secondary cell or a list of secondary cells.
  • the NAS resource reservation indication is used to indicate that after a network handover, part or all of the NAS resources of the source cell are reserved, where some or all of the NAS resources include one or more of the following: UE registration status , Tracking Area Updating (TAU) information, integrity and encryption information.
  • TAU Tracking Area Updating
  • the suspension indication is used to instruct to reserve part or all of the radio resources of the source cell after the network handover.
  • the part or all of the wireless resources include: part or all of the wireless connection, where the wireless connection includes at least one of the following: RRC connection, signaling radio bearer (Siganling Radio Bearer, SRB) , Data Radio Bearer (DRB), PDU session context, NAS layer connection.
  • RRC connection signaling radio bearer (Siganling Radio Bearer, SRB) , Data Radio Bearer (DRB), PDU session context, NAS layer connection.
  • SRB Signaling Radio Bearer
  • DRB Data Radio Bearer
  • PDU session context NAS layer connection.
  • the part or all of the wireless resources include: part or all of the wireless configuration, where the wireless configuration includes at least one of the following: Layer 1 (Layer 1, L1) (physical layer) configuration , Media Access Control (MAC) layer configuration, Radio Link Control (RLC layer) configuration, RRC layer configuration, Packet Data Convergence Protocol (PDCP) layer configuration, NAS layer Configuration.
  • Layer 1 Layer 1, L1
  • MAC Media Access Control
  • RLC Radio Link Control
  • PDCP Packet Data Convergence Protocol
  • NAS layer Configuration NAS layer Configuration.
  • the reserved PDU session information is used to instruct to reserve the PDU session after the network is switched.
  • the reserved PDU session information includes: PDU session reservation indication information, or an information list of PDU sessions to be reserved; wherein, the PDU session information list includes one or more PDU sessions Information.
  • reserving part or all of the radio resources includes: continuing to use the downlink bandwidth part (BandWidth Part, BWP); according to the resource indicator value (Resource Indicate Value) in the downlink control information (Downlink Control Information, DCI) , RIV) indicates information to receive downlink data sent by a Physical Downlink Shared Channel (Physical Downlink Shared Channel, PDSCH).
  • BWP downlink bandwidth part
  • DCI Downlink Control Information
  • RIV indicates information to receive downlink data sent by a Physical Downlink Shared Channel (Physical Downlink Shared Channel, PDSCH).
  • L CRBs is the length of consecutive RBs
  • Is the number of RBs in the downlink bandwidth
  • RB start is the starting resource block in the downlink bandwidth.
  • reserving part or all of the radio resources includes: reserving the UE’s Cell-Radio Network Temporary Identifier (C-RNTI), where the UE’s C-RNTI is used for Receive DCI information.
  • C-RNTI Cell-Radio Network Temporary Identifier
  • reserving part or all of the radio resources includes: reserving a physical uplink control channel (PUCCH) resource allocation method; and/or a set of allocated PUCCH resources.
  • PUCCH physical uplink control channel
  • reserving part or all of the radio resources includes: reserving one or more data radio bearers (DRB); reserving one or more signaling radio bearers (SRB); and reserving one of SRB1 or SRB2 Modified to SRB3.
  • DRB data radio bearers
  • SRB signaling radio bearers
  • reserving part or all of the wireless resources includes: continuing to use the original PDU session for data transmission; or, after the first communication node initiates the PDU session, rebuilding and restoring the data connection.
  • reserving part or all of the wireless resources includes: using the security context before the network handover.
  • reserving part or all of the radio resources includes: reserving a dedicated control channel (Dedicated Control Channel, DCCH).
  • DCCH Dedicated Control Channel
  • reserving the DCCH includes: continuing to send and receive data according to the DCCH.
  • reserving part or all of the wireless resources includes: reserving part or all of the QOS flow or QOS flow information.
  • retaining the QOS flow or QOS flow information includes: continuing to use the QOS flow and/or QOS flow information to send and/or receive user plane data.
  • this embodiment provides a network switching method for the defect of the first scenario (the UE switches from the SA 5G network to the EN-DC network).
  • the UE was originally connected to the SA 5G network, and the UE is performing MBB services. At this time, it needs to perform voice services (such as answering voice calls, or initiating voice calls), but the SA 5G network cannot support voice services, and the UE needs to switch to LTE network establishes VoLTE service (Voice based on LTE), the UE needs to continue the original MBB service, so the UE switches to the EN-DC network, establishes the VoLTE connection at the LTE RAN base station, and establishes the original MBB service at the NG-RAN base station connect.
  • voice services such as answering voice calls, or initiating voice calls
  • LTE network LTE network
  • VoLTE service Voice based on LTE
  • the UE needs to continue the original MBB service, so the UE switches to the EN-DC network, establishes the VoLTE connection at the LTE RAN base station, and establishes the original MBB service at the NG-RAN base station connect.
  • Fig. 6 is a flowchart of the UE switching from SA 5G network to EN-DC network provided by an embodiment of this application.
  • the UE is connected to the 5G base station (S-gNB) of the source SA 5G network, also known as the source Node (S-node), the target EN-DC network the UE switches to, T-MN (Target Master Node) is LTE eNB, also known as MeNB (Master eNB), T-SN (Target Secondary Node) is 5G base station , Which is NG-RAN node.
  • Step 601 The source node S-node (S-gNB in FIG. 2) sends a handover required message (Handover required message) to the core network (core network, CN).
  • the handover request message includes UE context reference (UE context reference at Source) information on the source side, where the information is included in the source-to-target transparent container (Source To Target) of the existing information element (Information Element, IE) of the message. transparent Container).
  • the UE context reference at Source uniquely identifies the association of the UE on the NG interface and the association of the UE on the source node (NG-RAN node) (uniquely identifies a UE association over an NG interface and the source NG-RAN node.) .
  • the source node is a gNB and the gNB is connected to the 5GC
  • the UE context reference at the Source can be jointly identified by the combination of Source NG-RAN node (globally unique identifier) and RAN UE NGAP ID. That is, the UE context reference at Source includes any one or a combination of Source NG-RAN node or RAN UE NGAP ID.
  • Step 602 The T-MN (Target Master NG-RAN Node) receives a handover request message (Handover request message) from the core network, where the handover request message includes UE context reference at Source information, and the information is included in the handover request message.
  • the information unit of the message is Source To Target transparent Container.
  • the UE context reference at Source information is carried in the Source To Target transparent Container. After receiving the UE context reference at Source information from the S-node, the CN directly sends the UE context reference at Source information to the T-MN.
  • Step 603 The T-MN sends a secondary node addition request (SN addition request) message to the T-SN.
  • the secondary node addition request message includes UE context reference at Source information or RAN UE NGAP ID information. Based on this information, the T-SN finds the UE context (UE context) of the UE at the source node, and continues to use the resources of the UE at the source side.
  • Step 604 The T-SN sends a secondary node addition request acknowledgement (SN addition request acknowledge) message to the T-MN to notify the T-MN that the UE has established a dual connection under the EN-DC network.
  • SN addition request acknowledge secondary node addition request acknowledgement
  • Step 605 The T-MN sends a Handover Request Acknowledge message to the core network.
  • the handover request notification message includes the UE context retention on the source side (UE context at source keep) information, which is contained in Target to Source transparent container.
  • the UE context at source keep information means that the UE resources of the UE in the source node will continue to be used in the target node after the handover, and the target node uses this information to notify the source node not to delete the UE's resources in the source node.
  • Step 606 The S-node receives a handover control (Handover command) message from the core network, where the handover control message includes UE context at source keep information, and the UE context at source keep information is included in the Target to Source transparent container.
  • a handover control (Handover command) message includes UE context at source keep information, and the UE context at source keep information is included in the Target to Source transparent container.
  • the UE context at Source keep information is carried in the Target to Source transparent container.
  • the CN receives the UE context at source keep information from the T-MN, it directly sends the UE context at source keep information to the S-node.
  • Step 607 The UE synchronizes to the target base station on the air interface, that is, the UE establishes a dual connection with the T-MN and the T-SN, the UE establishes the VoLTE service on the T-MN, and continues to complete the MBB service on the T-SN.
  • Step 608 The T-MN sends a handover notification (Handover notification) message to the core network, where the handover notification message is used to notify the core network that the UE has been handed over to the target base station.
  • a handover notification Handover notification
  • Step 609 The S-node receives the UE release control (UE release command message) from the core network.
  • the S-node releases the signaling connection between it and the CN (that is, releases the NG interface), but does not release the UE's resources. This is because the message received by the S-node in step 606 includes the indication information of the UE context at source keep, and the S-node learns that the radio resources of the UE in the source 5G base station are continuously used by the target base station.
  • Step 6010 The S-node sends a UE context release complete (UE release complete) message to the core network.
  • the source node mainly performs the following operations: through the core network, the S-node switches the UE to the target node, and the S-node sends to the core network And receive the following message from the core network.
  • Step 1 Send a Handover required message, which includes UE context reference at Source information; this information uniquely identifies the UE resource of the UE at the source node.
  • Step 2 Receive the Hanover command message, which includes UE context at source keep information. This information informs the source node not to release the UE resources of the UE at the source node.
  • Step 3 Receive the UE release comman message, the source node releases its connection with the core network, but does not release the UE resources of the UE at the source node.
  • Step 4 Send the UE release comple message to notify the core network that the connection between the source node and the core network has been released.
  • the target node mainly performs the following operations.
  • the target master node sends and receives the following messages to and from the core network, and sends and receives the following messages to the target secondary node.
  • Step 1 Receive a Handover request message from the core network, the message includes UE context Reference at Source information;
  • Step 2/3 According to the UE context Reference at Source information, the T-SN selected by the T-MN is the S-node, and the EN-DC dual connection is established for the UE through step 2/3;
  • Step 4 Send a Handover request acknowledgement message to the core network.
  • the message includes UE context at Source keep information, indicating that the UE resources of the UE in the source node need to be reserved and continue to be used by the target secondary node.
  • Step 5 After the UE synchronizes to the target node, it sends a Handover notify message to the core network to notify the core network that the UE has been handed over to the target node.
  • this embodiment provides a network switching method for the defect of the second scenario (UE switching from the EN-DC network to the SA 5G network).
  • the UE was originally connected to the EN-DC network, for example, the UE performs MBB services while making a call.
  • S-MN Master Node is LTE eNB
  • S-SN Secondary Node is gNB, also known as NG-RAN node
  • the UE terminates the VoLTE service (e.g. hangs up
  • the 5G service such as broadband streaming media service, MBB service
  • the UE switches from the EN-DC network to the SA 5G network (Stand Alone NR).
  • Figure 7 is a flowchart of the UE switching from the EN-DC network to the SA 5G network in this application. As shown in Figure 7, when the S-SN node and the T-MN node are the same NG-RAN node, the following process is performed:
  • Step 71 The S-MN (source master node, such as MeNB node) sends a handover required message (Handover required message) to the core network (core network, CN), and the message includes the context reference (UE context reference at Source). ) Information element (IE), which is contained in Source To Target transparent Container.
  • source master node such as MeNB node
  • IE Information element
  • the UE context reference at Source can be identified by the SN UE X2AP ID information element .
  • Step 72 T-node (Target NG-RAN node) receives a handover request message (Handover request message) from the core network, where the handover request message includes UE context reference at Source information, which is included in Source To Target transparent Container.
  • a handover request message Handover request message
  • Step 73 The T-node sends a Handove request acknowledgement message, which includes UE context at Source keep information in the source test.
  • the T-node judges that it is the same NG-RAN node as the S-SN and decides to continue to use the UE resources on the S-SN, the message includes the indication information, which is included in the Target to Source transparent container middle.
  • Step 74 The S-MN receives a handover control (Handover command) message sent by the core network, and the message includes UE context at Source keep information.
  • a handover control (Handover command) message sent by the core network, and the message includes UE context at Source keep information.
  • Step 75 The S-MN sends a secondary node release request (SN release request) message to the S-SN, and the message includes UE context at Source keep information.
  • SN release request secondary node release request
  • Step 76 The S-SN sends a secondary node release request acknowledgement (SN release request acknowledge) message to the S-MN.
  • Step 77 The UE synchronizes to the target base station on the air interface, that is, the UE establishes a connection with the T-node, and the UE continues to perform the MBB service at the SA 5G base station.
  • Step 78 The T-node sends a handover notification (Handover notify) message to the core network to notify the core network that the UE has been handed over to the target base station (T-node).
  • Handover notify a handover notification
  • Step 79 The S-MN receives a UE release command (UE release command) message from the core network.
  • the S-MN releases its connection with the CN (that is, releases the S1 interface).
  • Step 710 The S-MN sends a UE release complete (UE release complete) message to the core network.
  • Step 711 The S-MN sends a UE release (UE release) message to the S-SN. After the S-SN receives the message, the S-SN releases the signaling connection with the M-SN, but keeps the UE's resources on the S-SN so that the T-MN can continue to use it.
  • UE release UE release
  • the source node mainly performs the following operations.
  • the source master node sends and receives the following messages to and from the core network; sends and receives the following messages to and from the source slave node.
  • Step 1 Send a Handover required message to the core network.
  • the message includes UE context reference at Source information; this information uniquely identifies the UE resource of the UE in the source secondary node.
  • Step 2 Receive a Hanover command message from the core network, and the message includes UE context at source keep information. This information informs the source secondary node (S-SN) not to release the UE resources of the UE in the source secondary node.
  • S-SN source secondary node
  • Step 3 Send an SN release request message to the S-SN.
  • the message includes UE context at source keep information to notify the source secondary node (S-SN) not to release the UE resources of the UE in the source secondary node.
  • S-SN source secondary node
  • Step 4 Receive the SN release request acknowledge message from the S-SN, and learn that the S-SN releases the X2 connection with the source master node.
  • the target node mainly performs the following operations.
  • T-node sends and receives the following messages to and from the core network.
  • Step 1 Receive Handover request message, which includes UE context reference at Source information.
  • Step 2 Send a Handove request acknowledgement message.
  • the message includes UE context at Source keep information.
  • Step 3 The UE synchronizes to the target base station on the air interface, that is, the UE establishes a connection with the T-node, and the UE continues to perform the MBB service at the SA 5G base station.
  • Step 4 The T-node sends a Handover notify message to the core network to notify the core network that the UE has been handed over to the target base station (T-node).
  • FIG. 8 is a flowchart of a method for switching between 4G and 5G and 5G SA/NSA modes when a terminal initiates a voice call according to an embodiment of the application.
  • This embodiment is the operation between the terminal and the target RAN node and the RAN node of the source network in the above embodiment; this embodiment involves three network nodes, network node 1 is the UE; network node 2 is the network where the UE currently resides Node NR gNB; network node 3 is an evolved universal terrestrial radio access (Evolved-Universal Radio Access, E-UTRA) eNB of the target network RAN network node for UE handover.
  • E-UTRA evolved universal terrestrial radio access
  • the UE in the RRC connected state actively initiates the Internet Protocol Multimedia Subsystem (IMS) voice call service to the RAN node gNB of the source network to which it belongs.
  • IMS Internet Protocol Multimedia Subsystem
  • the gNB sends a mobility control (MobilityFromNRCommand) message from NR to notify the UE to switch to the EN-DC network; the MobilityFromNRCommand message contains auxiliary Cell or cell group information (NR).
  • MobilityFromNRCommand mobility control
  • S803 The terminal initiates a handover to E-UTRA according to the MobilityFromNRCommand. If the terminal finds that the secondary cell or cell group information is consistent with the cell or cell group information of the source network node gNB; after completing the handover to the cell network node eNB of the E-UTRA; retain part or all of the information with the source network node gNB.
  • the EN-DC network transmits data through the reserved partial wireless connection or wireless configuration or partial or all reserved PDU SESSION.
  • the UE receives the MobilityFromNRCommand message carrying zero to multiple secondary cells or cell group information, if one of the cells or cell group information is consistent with the cell information or cell group information of the source cell or uses the same network node gNB; the UE does not initiate a request for wireless configuration or wireless connection establishment with the network node gNB of the secondary cell or cell group.
  • the UE reserves part or all of the wireless configuration or part or all of the wireless connection with the S-MN network node gNB of the source cell.
  • the UE After the UE receives the MobilityFromNRCommand message carrying the primary cell or cell group information, if one of the cells or cell group information is consistent with the cell information or cell group information of the source cell or uses the same network node gNB; the UE retains the information with the source Part or all of the radio resources of the S-MN network node gNB of the cell.
  • the part or all of the connection includes: RRC connection; part or all of SRB; part or all of DRB.
  • the part or all of the wireless resources include: L1 (physical layer) resources, MAC resources, SRB, DRB, PDCP entities, and Service Data Adaptation Protocol (SDAP) entities.
  • the wireless configuration includes: part or all of the L1 (physical layer) configuration, part or all of the MAC layer configuration, part or all of the RLC layer configuration, part or all of the RRC layer configuration; part or all of the PDCP layer configuration , Part or all of the NAS configuration.
  • step S801 Initiating a voice call service in step S801 includes the following processing:
  • the terminal sends an invite message to the IMS server via gNB, the IMS server sends a 100trying message to the UE via gNB, the UE sends 183 Session Progress to the IMS server via gNB, the IMS server sends a Provisional ACKnowledgement (PRACK) message to the UE, and the UE sends a 200 OK message To the IMS server.
  • the IMS server sends a 100trying message to the UE via gNB
  • the UE sends 183 Session Progress to the IMS server via gNB
  • the IMS server sends a Provisional ACKnowledgement (PRACK) message to the UE
  • PRACK Provisional ACKnowledgement
  • the reserved part or all of the physical layer configuration includes: the UE continues to use the downlink BWP, and receives downlink data sent by the PDSCH according to the RIV indication information in the DCI.
  • L CRBs is the length of consecutive RBs, Is the number of RBs in the downlink bandwidth, and RB start is the starting resource block in the downlink bandwidth.
  • the reserving part or all of the physical layer configuration includes: reserving the C-RNTI of the UE, and the C-RNTI of the UE is used for receiving the DCI information.
  • the reserved part or all of the physical layer configuration includes: reserved uplink control channel PUCCH resource allocation mode, and/or reserved allocated PUCCH resource set.
  • the reserving part or all of the wireless connections includes: reserving one or more DRBs (Data Radio Bearers).
  • DRBs Data Radio Bearers
  • the reserving part or all of the wireless connections includes: reserving one or more SRBs (Signaling Radio Bearers).
  • SRBs Signaling Radio Bearers
  • the reserving part or all of the wireless connection includes: modifying one of SRB1 or SRB2 to SRB3.
  • the reserving part or all of the NAS configuration includes reserving the registration status of the UE, and or TAU information, and/or integrity and encryption information.
  • the UE After the UE completes the handover, it continues to use the original PDU SESSION for data transmission; or initiates the reconstruction of the PDN connection in the E-sgNB to restore the data connection.
  • the UE After the UE completes the handover, it continues to use the original PDU SESSION for data transmission; or initiates the reconstruction of the PDU SEESSION in the E-sgNB to restore the data connection.
  • FIG. 9 is a flowchart of a method for switching between 4G and 5G and 5G SA/NSA modes when a terminal initiates a voice call according to an embodiment of the application.
  • This embodiment involves three network nodes, network node 1 is the UE; network node 2 is the NR g-NB of the network where the UE currently resides; network node 3 is the E-UTRA eNB of the target network for the UE handover.
  • the UE processing the RRC connected state actively initiates an IMS voice call service to the gNB.
  • the eNB After the CN finds that the current 5GS does not support the IMS voice service, the eNB sends a MobilityFromNRCommand message to notify the UE to switch to the EN-DC network; the MobilityFromNRCommand message contains indication information for reserving the source NR cell.
  • the terminal initiates a handover to E-UTRA according to the MobilityFromNRCommand; after completing the cell handover to the E-UTRA; reserves part or all of the wireless connection or wireless configuration of the source NR cell, or reserves part or all of the PDU SESSION .
  • the part or all of the connection includes: RRC connection; and related SRB and DRB.
  • the part or all of the wireless resources include: L1 (physical layer) resources, MAC resources, SRB, DRB, PDCP entities, and SDAP entities.
  • the wireless configuration includes: part or all of the L1 (physical layer) configuration, part or all of the MAC layer configuration, part or all of the RLC layer configuration, part or all of the RRC layer configuration; part or all of the PDCP layer configuration, part Or all NAS configuration.
  • the EN-DC network transmits data through the reserved part or all of the wireless connection or wireless configuration or PDU SESSION.
  • FIG. 10 is a flowchart of a method for a terminal to switch between 4G, 5G, and 5G SA/NSA modes according to an embodiment of this application.
  • This embodiment involves three network nodes, the network node 1 is the UE; the network node 2 is the network NR gNB where the UE currently resides; and the network node 3 is the E-UTRA eNB of the target network for the UE handover.
  • the UE in the RRC connected state sends a measurement report to the gNB.
  • the gNB sends a MobilityFromNRCommand message to notify the UE to switch to the EN-DC network; the MobilityFromNRCommand message contains the T-MN information (M-eNB) of the E-UTRA and the indication information of the source NR cell to be reserved.
  • M-eNB T-MN information
  • the terminal initiates a handover to E-UTRA according to the MobilityFromNRCommand; after completing the cell handover to the E-UTRA; reserves part or all of the radio bearers of the source NR cell.
  • the reserving part or all of the radio bearers of the source cell includes: reserving part or all of the original physical layer resource configuration, reserving part or all of the SDAP entities or PDCP entities in SRB1, SRB2, and DRB; reserving all of the NR network Or part of the PDU SESSION; for all or part of the PDU SESSION, the corresponding PDN CONNECTION connection re-establishment is initiated on the EN-DC network.
  • the eNB schedules the UE to transmit control signaling or data through the reserved part of the SRB or DRB or PDU SESSION according to network requirements.
  • FIG. 11 is a flowchart of a method for a terminal to switch between 4G, 5G, and 5G SA/NSA modes according to an embodiment of this application.
  • This embodiment involves three network nodes, the network node 1 is the UE; the network node 2 is the network NR gNB where the UE currently resides; and the network node 3 is the E-UTRA eNB of the target network for the UE handover.
  • the UE in the RRC connected state sends a measurement report to the gNB
  • the eNB sends a MobilityFromNRCommand message to notify the UE to switch to the EN-DC network;
  • the MobilityFromNRCommand message contains E-UTRA T-MN information (M-eNB) and T-SN information (gNB)
  • the terminal initiates a handover to E-UTRA according to the MobilityFromNRCommand; after completing the cell handover to the E-UTRA; if the T-SN is the source NR cell (that is, the T-SN is the node of the source NR cell) ; Retain part or all of the radio bearers of the source NR cell.
  • the reserving part or all of the radio bearers of the source cell includes: reserving part or all of the original physical layer resource configuration, or reserving part or all of the SDAP entities or PDCP entities in the SRB1, SRB2, and DRB; reserving the NR network All or part of the PDU SESSION; for all or part of the PDU SESSION, the corresponding PDN CONNECTION reconstruction is initiated on the EN-DC network.
  • the eNB schedules the UE to transmit control signaling or data through the reserved part of the SRB or DRB or PDU SESSION according to network requirements.
  • FIG. 12 is a flowchart of a method for switching between 4G and 5G, and 5G SA/NSA modes when a terminal voice call is called according to an embodiment of the application.
  • This embodiment involves three network nodes, the network node 1 is the UE; the network node 2 is the NR gNB of the network where the UE currently resides; and the network node 3 is the E-UTRA eNB of the target network for the UE handover.
  • the CN tries to initiate an IMS called voice call service for the UE in the connected state, and after finding that the 5GS does not support the IMS Voice service, the eNB sends a MobilityFromNRCommand message to notify the UE in the connected state to switch to the EN-DC network; in the MobilityFromNRCommand message Contains T-MN information (M-eNB) of E-UTRA and T-SN information.
  • M-eNB T-MN information
  • the terminal initiates a handover to E-UTRA according to the MobilityFromNRCommand; sends an RRC reconfiguration (RRCRECONFIGURATION) message to the eNB.
  • RRC reconfiguration RRCRECONFIGURATION
  • the reserving part or all of the radio resources of the source cell includes one of the following: reserving part or all of the original physical layer (L1) resource configuration, reserving part or all of the SDAP entities or PDCP entities in SRB1, SRB2, and DRB ; Retain all or part of the PDU SESSION in the NR network; For all or part of the PDU SESSION, the corresponding PDN CONNECTION connection re-establishment is not initiated in the EN-DC network.
  • L1 original physical layer
  • the EN-DC network transmits control signaling or data through the reserved part of the SRB or DRB or PDU SESSION.
  • FIG. 13 is a flowchart of a method for a terminal to perform network handover based on a measurement report of the current network provided by an embodiment of this application.
  • the UE is connected to the EN-DC5G network in a connected state, and the terminal is connected to the NR
  • the node gNB is performing Enhanced Mobile Broadband (EMMB) services.
  • EMMB Enhanced Mobile Broadband
  • the network side finds that the UE needs to switch the MN cell; in order to ensure the continuity of the EMMB service, especially the continuity of the PDU SESSION data;
  • the switching process is as follows:
  • the eNB sends an RRCConnectionReconfiguration message to notify the UE to switch to another EN-DC network; wherein the RRCConnectionReconfiguration message includes a primary cell or cell group and zero to multiple secondary cells or cell groups.
  • the UE receives the RRCConnectionReconfiguration, initiates handover to the target EN-DC cell specified in the RRCConnectionReconfiguration, and sends an RRC Connection Reconfiguration Complete (RRCConnectionReconfigurationComplete) message to the eNB of the target cell to complete the handover from the NR cell to the EN-DC cell .
  • the UE decides whether to retain all or part of the PDU SESSION of the current UE and the source cell (S-MN, gNB) according to the secondary cell or cell group in the RRCConnectionReconfiguration.
  • the primary cell or cell group and 0 to more secondary cells or cell groups are consistent with the source cell or cell group, then reserve part or all of the current UE and source cell (S-MN, gNB) information between the UE and the source cell. All or part of the PDU SESSION.
  • the UE retains the S-MN PDU SESSION with the source cell after the handover; the UE does not initiate a new session based on the PDU SESSION identifier (ID) and/or Internet Protocol (IP) address and/or APN information.
  • the UE receives and/or sends data through some or all of the reserved PDU SESSION.
  • FIG. 14 is a flowchart of a method for a terminal to perform a network handover based on a measurement report of the current network according to an embodiment of this application.
  • the UE was originally connected to the SA 5G network, and the UE is performing MBB service.
  • voice services such as answering voice calls or initiating voice phone calls
  • the UE needs to switch to the LTE network to establish the VoLTE service (Voice based on LTE).
  • the original MBB service needs to be continued, so the UE switches to the EN-DC network, establishes a VoLTE connection on the LTE RAN node, and establishes the original MBB service connection on the NG-RAN node.
  • the UE is connected to the 5G base station (S-gNB) of the source SA 5G network, also known as the source node (S-node).
  • the T-MN (Target Master node) is the LTE eNB, Also called MeNB (Master eNB)
  • T-SN Target Secondary node
  • NG-RAN node When the target NG-RAN node is the original NR node, the switching process is as follows:
  • the gNB sends a MobilityFromNRCommand message to notify the UE to switch to the EN-DC network; wherein the MobilityFromNRCommand message contains an instruction to reserve the source cell (that is, the source NR cell).
  • the UE receives the MobilityFromNRCommand and initiates a handover to the target EN-DC cell, and sends an RRCConnectionReconfigurationComplete message to the e-NB of the target cell to complete the handover from the NR cell to the EN-DC cell.
  • the UE decides whether to reserve all or part of the PDU SESSION of the current UE and the source cell or cell group (S-MN, gNB) according to the indication of reserving the source cell in the MobilityFromNRCommand. If the indicated indication information is to reserve the source cell, then reserve part or all of the current UE and source cell (S-MN, gNB) PDU SESSION of part or all of the secondary node S-SN of the UE and the source cell.
  • the UE After the UE receives the MobilityFromNRCommand message carrying the indication information of the T-MN and the reserved source cell, if the indication information is to reserve the source cell, the UE does not initiate reconstruction for the PDU SESSION of the reserved source cell.
  • the UE After the handover, the UE retains the S-MN PDU SESSION with the source cell; the UE does not initiate a new PDU SESSION establishment request based on the PDU SESSION ID and/or IP address and/or APN information; establishes a new PDU SESSION.
  • FIG. 15 is a flowchart of a method for a terminal to perform a network handover based on a measurement report of the current network according to an embodiment of the application.
  • the UE is connected to the EN-DC5G network in a connected state, and the terminal is connected to the NR
  • the node gNB is performing the EMMB service.
  • the network side finds that the UE needs to switch to the MN cell; in order to ensure the continuity of the EMMB service, the network hopes to maintain the current wireless configuration or wireless connection of the SN cell
  • the switching process is as follows:
  • the eNB sends an RRCConnectionReconfiguration message to notify the UE to switch to another EN-DC network; wherein the RRCConnectionReconfiguration message includes the secondary cell or cell group reservation indication information.
  • the UE receives the RRCConnectionReconfiguration and initiates a handover to the target EN-DC cell, and sends an RRCConnectionReconfigurationComplete message to the eNB of the target cell to complete the handover from the NR cell to the EN-DC cell.
  • the UE decides whether to reserve the current wireless configuration or wireless connection between the UE and the source secondary cell or cell group according to the reservation indication information of the secondary cell or cell group in the RRCConnectionReconfiguration. If it is instructed to reserve the secondary cell, then reserve part or all of the wireless configuration or wireless connection between the UE and the source secondary cell or cell group.
  • the EN-DC network communicates with the UE through the T-MN and the reserved part or all of the wireless configuration or wireless connection of the source secondary cell or cell group.
  • the UE After the UE receives the RRCConnectionReconfiguration message carrying the indication information of the secondary cell reservation of the T-MN, if the indication information indicates that the secondary cell is reserved, the UE does not initiate conformity with the information of the source secondary cell or cell group or The wireless configuration or wireless connection update or reestablishment of the secondary cell or cell group using the same network node.
  • the UE After the UE receives the RRCConnectionReconfiguration message carrying the indication information of the secondary cell reservation of the T-MN, if the indication information indicates that the secondary cell is reserved, the UE reserves part or all of the radio resources with the source secondary cell or cell group.
  • the part or all of the wireless resources include: L1 (physical layer) resources, MAC resources, SRB, DRB, PDCP entities, and SDAP entities.
  • the wireless configuration includes: part or all of the L1 (physical layer) configuration, part or all of the MAC layer configuration, part or all of the RLC layer configuration, part or all of the RRC layer configuration; part or all of the PDCP layer configuration, part Or all NAS configuration.
  • FIG. 16 is a flowchart of a method for a terminal to perform a network handover based on a measurement report of the current network according to an embodiment of this application.
  • the UE was originally connected to the SA 5G network and the UE is performing MBB services.
  • voice services such as answering voice calls or initiating voice phone calls
  • the UE needs to switch to the LTE network to establish the VoLTE service (Voice based on LTE).
  • the original MBB service needs to be continued, so the UE switches to the EN-DC network, establishes a VoLTE connection on the LTE RAN node, and establishes the original MBB service connection on the NG-RAN node.
  • the UE needs to establish a PDU SESSION with the network for data communication.
  • the UE In order to maintain data continuity during network switching, the UE generally releases the current PDU SESSION after the network switch and establishes a new PDU SESSION or session in the target cell.
  • Describe the protocol connection Session Description Procotol CONNECTION, SDP CONNECTION
  • PDU session or SDP CONNECTION reconstruction will temporarily interrupt data transmission; in order to ensure higher data continuity, the target cell’s T-SN and the current cell’s S-
  • the process is as follows:
  • the gNB sends a MobilityFromNRCommand message to notify the UE to switch to the EN-DC network; the MobilityFromNRCommand message includes a PDU SESSION reservation indication.
  • the UE receives the MobilityFromNRCommand, initiates a handover to the target EN-DC cell, and sends an RRCConnectionReconfigurationComplete message to the eNB of the target cell.
  • the UE decides whether to reserve all or part of the PDU SESSION of the current UE and the node (S-MN, gNB) of the source cell or cell group according to the PDU reservation indication information in the MobilityFromNRCommand. If the indicated information is to reserve the source cell, then reserve part or all of the UE and the secondary node S-SN of the source cell. All or part of the PDU of the current UE and the node (S-MN, gNB) of the source cell or cell group SESSION .
  • the EN-DC network continues to communicate through the reserved PDU SESSION.
  • the UE After the UE receives the MobilityFromNRCommand message carrying the indication information of the T-MN and reserved PDU SESSION, if the indication information is a reserved PDU, the UE does not initiate re-establishment for the reserved PDU SESSION of the source cell.
  • the PDU SESSION reservation indication information may be an indication of PDU SESSION reservation, or a list of PDU SESSION information that needs to be reserved.
  • the UE retains the PDU SESSION with the S-MN of the source cell; the UE does not initiate a new PDU SESSION establishment request based on the PDU SESSION ID and/or IP address and/or APN information; establishes a new PDU SESSION.
  • this embodiment provides a UE that supports handover between different networks, and the UE performs the following operations:
  • the UE receives the MobilityFromNRCommand message of the NR, where the MobilityFromNRCommand message contains the source cell reservation indication information, or cell or cell group information.
  • the UE decides whether to reserve all or part of the PDU SESSION in the source network according to the source cell reservation indication information or the relationship between the cell or cell group information and the source cell or cell group.
  • the UE continues to communicate through the reserved PDU SESSION.
  • the UE After the handover, the UE retains the S-MN PDU SESSION with the source cell; the UE does not initiate a new PDU SESSION establishment request based on the PDU SESSION ID and/or IP address and/or APN information; establishes a new PDU SESSION .
  • this embodiment provides a UE that supports handover between different networks, and the UE performs the following operations:
  • the UE receives the MobilityFromNRCommand message of the NR, and the MobilityFromNRCommand message contains reserved PDU SESSION information.
  • the UE decides whether to reserve all or part of the PDU SESSION in the source network according to the reserved PDU SESSION information.
  • the UE continues to communicate through the reserved PDU SESSION.
  • the UE After the handover, the UE retains the S-MN PDU SESSION with the source cell; the UE does not initiate a new PDU SESSION establishment request based on the PDU SESSION ID and/or IP address and/or APN information; establishes a new PDU SESSION .
  • the reserved PDU SESSION information may be: an indication to reserve a PDU session; or an information list of a PDU SESSION that needs to be reserved; the PDU SESSION information list includes at least one PDU SESSION information.
  • a network node that supports handover between different networks: sends a MobilityFromNRCommand or RRCCONNECTION RECONFIGURATION message, and the MobilityFromNRCommand or RRCCONNECTION RECONFIGURATION message contains source cell reservation indication information, or cell or cell Group information, or PDU SESSION reserved information or DRB reserved information.
  • the cell reservation indication information is used to instruct the terminal to reserve all or part of the wireless connection or wireless configuration of the source cell after the handover.
  • the cell or cell information may be used to instruct the terminal to reserve all or part of the wireless connection or wireless configuration of the source cell after the handover.
  • the cell reservation indication information may be used to instruct the terminal to reserve all or part of the wireless connection or wireless configuration of the source cell after the handover.
  • the DRB reservation information is used to instruct the terminal to reserve part or all of the DRB after cell handover.
  • the cell or cell information may be used to instruct the terminal to reserve all or part of the radio resource configuration or all or part of the wireless connection or all or part of the PDU SEESSION of the source cell after the handover.
  • the PDU SESSION reservation information is used to instruct the terminal to reserve all or part of the radio resource configuration or all or part of the wireless connection or all or part of the PDU SEESSION of the source cell.
  • a network node core network element of the target network that supports handover between different networks: after receiving an RRCCONNECTION RECONFIGURATION message sent by a terminal that reserves some or all of the source cell's wireless connection or wireless resources ; The network performs data communication through some or all of the reserved wireless connections or wireless configurations.
  • a network node that supports switching between different networks: After receiving the RRCCONNECTION RECONFIGURATION message sent by the terminal that reserves the PDU SESSION, the network passes the reserved part or all of the RRCCONNECTION RECONFIGURATION message -PDU SESSION for data communication.
  • an embodiment of the present application provides a network switching device
  • FIG. 17 is a schematic structural diagram of a network switching device provided in an embodiment of the application.
  • the device can be applied to the situation where the UE continues to use the original radio resources before and after the network switch.
  • the network switching device may be implemented by software and/or hardware, and the method is applied to the first communication node.
  • the network switching device provided by the embodiment of the present application mainly includes a first sending module 171 and a first receiving module 172.
  • the first sending module 171 is configured to send a handover demand message to the core network, where the handover demand message carries UE context reference information on the source side.
  • the first receiving module 172 is configured to receive a handover control message sent by the core network, where the handover control message carries UE context retention information on the source side, and the UE context retention information on the source side is used for The network node on the source side is instructed not to release the resources used by the UE, and the UE context retention information on the source side is determined by the UE context reference information on the source side.
  • the first receiving module 172 is further configured to receive the second communication before receiving the switching control message sent by the core network A secondary node addition request message sent by a node, wherein the secondary node addition request message carries the UE context reference information on the source side; the first sending module 171 is also configured to send the secondary node to the second communication node An add notification message, wherein the secondary node add notification message is used to inform the target node that the UE establishes a dual connection in the EN-DC network.
  • the UE context reference information on the source side includes: a source 5G radio access network node (Source NG-RAN node) and/or a radio access network terminal NG interface application protocol identifier (RAN UE NGAP ID).
  • Source NG-RAN node source 5G radio access network node
  • RAN UE NGAP ID radio access network terminal NG interface application protocol identifier
  • the secondary node addition request message carries the UE context reference information on the source side and is sent by the core network to the second communication node.
  • the first communication node is a 5G base station in the SA 5G network
  • the second communication is EN-DC LTE eNB in the network.
  • the first sending module 171 is further configured to communicate with the second network after receiving the switching control message sent by the core network.
  • the node sends a secondary node addition request message, where the secondary node addition request message carries the UE context reference information on the source side;
  • the first receiving module 172 is also configured to receive the secondary node addition notification sent by the second communication node Message, wherein the secondary node adds a notification message to notify the UE to establish a dual connection under the EN-DC network.
  • the first sending module 171 is configured to send a third message to the third communication node in the case of determining that the resource is reserved for use, wherein the third message carries radio resource indication information .
  • the first sending module 171 is configured to send a UE release completion message to the core network after the UE release complete message is sent to the core network, and then to the second communication
  • the node sends a UE release message, where the UE release message is used to instruct the second communication node to release the signaling connection with the node.
  • the UE context reference information on the source side includes: SN UE X2AP ID information element.
  • the first communication node is the LTE eNB in the EN-DC network
  • the secondary node is the SA 5G network 5G base station in China.
  • the network switching device provided in this embodiment can execute the network switching method provided in any embodiment of the present application, and has corresponding functional modules for executing the method.
  • the network handover method provided in any embodiment of this application.
  • the various units and modules included are only divided according to the functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be realized; the names of the functional units are only for It is easy to distinguish each other and is not used to limit the scope of protection of this application.
  • FIG. 18 is a schematic structural diagram of a network switching device provided by an embodiment of the present application.
  • the device can be applied to the situation where the UE continues to use the original radio resources before and after the network switch.
  • the network switching device may be implemented by software and/or hardware, and the method is applied to the second communication node.
  • the network switching device provided by the embodiment of the present application mainly includes a second receiving module 181 and a second sending module 182.
  • the second receiving module 181 is configured to receive a handover request message sent by the core network, where the handover request message carries UE context reference information on the source side;
  • the second sending module 182 is configured to send a handover request notification message to the core network, where the handover request notification message carries UE context retention information on the source side, wherein the UE context retention information on the source side It is used to instruct the network node on the source side not to release the resources used by the UE, and the UE context retention information on the source side is determined by the UE context reference information on the source side.
  • the second sending module 182 is configured to send to the first communication node after receiving the handover request message sent by the core network when the network handover is the SA 5G network handover to the EN-DC network.
  • the secondary node addition request message of the secondary node wherein the secondary node addition request message carries the UE context reference information on the source side;
  • the second receiving module 181 is configured to receive the secondary node addition notification sent by the first communication node Message, wherein the secondary node adds a notification message to notify the target node that the UE establishes a dual connection in the EN-DC network.
  • the second receiving module 181 is configured to receive a secondary node addition request message sent by the first communication node when the network switching is from the EN-DC network to the SA 5G network, where:
  • the secondary node addition request message carries the UE context reference information on the source side;
  • the second sending module 182 is configured to send a secondary node addition notification message to the first communication node, where the secondary node addition notification message is used for Inform the UE to establish a dual connection under the EN-DC network.
  • the second receiving module 181 is configured to receive a UE release message sent by the first communication node when the network handover is a SA 5G network handover to an EN-DC network, where the UE The release message is used to instruct the local node to release the signaling connection with the first communication node.
  • the network switching device provided in this embodiment can execute the network switching method provided in any embodiment of the present application, and has corresponding functional modules for executing the method.
  • the network handover method provided in any embodiment of this application.
  • the various units and modules included are only divided according to the functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be realized; the names of the functional units are only for It is easy to distinguish each other and is not used to limit the scope of protection of this application.
  • FIG. 19 is a schematic structural diagram of a network switching device provided by an embodiment of the present application.
  • the device can be applied to the situation where the UE continues to use the original radio resources before and after the network switch.
  • the network switching device may be implemented by software and/or hardware, and the method is applied to the third communication node.
  • the network switching apparatus provided by the embodiment of the present application mainly includes a third receiving module 191 and a reservation module 192.
  • the third receiving module 191 is configured to receive a third message, where the third message carries radio resource indication information.
  • the reservation module 192 is configured to reserve part or all of the radio resources of the source cell according to the radio resource indication information.
  • the third message is sent by the first communication node.
  • the third message is an RRC reconfiguration message, or the third message is a radio control message.
  • the radio resource indication information includes: source cell reservation indication information, or secondary cell information, or reserved PDU session information, or NAS resource reservation indication, or suspension indication, or QoS flow reservation information .
  • the QoS flow reservation information is used to instruct to reserve QoS flow or QoS flow information after the network is switched.
  • the source cell reservation indication information is used to instruct to reserve part or all of the radio resources of the source cell after the network handover.
  • part or all of the radio resources of the source cell are reserved.
  • the secondary cell information is information of a single secondary cell or a list of secondary cells.
  • the NAS resource reservation indication is used to indicate that after a network handover, part or all of the NAS resources of the source cell are reserved, where some or all of the NAS resources include one or more of the following: UE registration status , TAU information, and integrity and encryption information.
  • the suspension indication is used to instruct to reserve part or all of the radio resources of the source cell after the network handover.
  • the part or all of the wireless resources include: part or all of the wireless connection, where the wireless connection includes at least one of the following: RRC connection, SRB, DRB, PDU session context, NAS layer connection .
  • the part or all of the wireless resources include: part or all of the wireless configuration, where the wireless configuration includes at least one of the following: L1 (physical layer) configuration, MAC layer configuration, RLC layer configuration , RRC layer configuration, PDCP layer configuration, and NAS layer configuration.
  • L1 physical layer
  • MAC layer configuration MAC layer configuration
  • RLC layer configuration MAC layer configuration
  • RRC layer configuration PDCP layer configuration
  • NAS layer configuration NAS layer configuration
  • the reserved PDU session information is used to instruct to reserve the PDU session after the network is switched.
  • the reserved PDU session information includes: PDU session reservation indication information, or a list of PDU session information to be reserved; wherein, the PDU session information list includes information about one or more PDU sessions .
  • the reservation module 192 is configured to continue to use the downlink bandwidth part (BWP); according to the RIV indication information in the downlink control information DCI, the downlink data sent by the PDSCH is received.
  • BWP downlink bandwidth part
  • L CRBs is the length of consecutive RBs
  • Is the number of RBs in the downlink bandwidth
  • RB start is the starting resource block in the downlink bandwidth.
  • the reservation module 192 is configured to reserve the C-RNTI of the UE, where the C-RNTI of the UE is used to receive DCI information.
  • the reservation module 192 is configured to reserve a physical uplink control channel (PUCCH) resource allocation mode; and/or, reserve a set of allocated PUCCH resources.
  • PUCCH physical uplink control channel
  • the reservation module 192 is configured to reserve one or more data radio bearers (DRB); reserve one or more signaling radio bearers (SRB); modify one of SRB1 or SRB2 to SRB3 .
  • DRB data radio bearers
  • SRB signaling radio bearers
  • the reservation module 192 is configured to continue to use the original PDU session for data transmission; or, after the first communication node initiates the PDU session, the data connection is restored and restored.
  • the retention module 192 is configured to use the security context before the network switch.
  • the reservation module 192 is configured to reserve the DCCH.
  • the reservation module 192 is configured to continue to send and receive data according to the DCCH.
  • the retention module 192 is configured to retain part or all of the QOS flow or QOS flow information.
  • the reservation module 192 is configured to continue to use the QOS stream and/or QOS stream information to send and/or receive user plane data.
  • the network switching device provided in this embodiment can execute the network switching method provided in any embodiment of the present application, and has corresponding functional modules for executing the method.
  • the network handover method provided in any embodiment of this application.
  • the various units and modules included are only divided according to the functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be realized; the names of the functional units are only for It is easy to distinguish each other and is not used to limit the scope of protection of this application.
  • FIG. 20 is a schematic structural diagram of a device provided by an embodiment of the present application.
  • the device includes a processor 201, a memory 202, an input device 203, an output device 204, and Communication device 205; the number of processors 201 in the device can be one or more.
  • one processor 201 is taken as an example; the processor 201, memory 202, input device 203, and output device 204 in the device can be connected via a bus or Connect in other ways.
  • connection via a bus is taken as an example.
  • the memory 202 can be used to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the network switching method in the embodiment of the present application (for example, the first The sending module 171 and the first receiving module 172) are similar to the program instructions/modules corresponding to the network switching method in the embodiment of the present application (for example, the second receiving module 181 and the second sending module 182 in the network switching device), and then Such as the program instructions/modules corresponding to the network switching method in the embodiment of the present application (for example, the third receiving module 191 and the reservation module 192 in the network switching device).
  • the processor 201 executes various functional applications and data processing of the device by running software programs, instructions, and modules stored in the memory 202, that is, implements any method provided in the embodiments of the present application.
  • the memory 202 may mainly include a program storage area and a data storage area.
  • the program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created according to the use of the device, and the like.
  • the memory 202 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices.
  • the memory 202 may include a memory remotely provided with respect to the processor 201, and these remote memories may be connected to the device through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.
  • the input device 203 may be configured to receive input numeric or character information, and generate key signal input related to user settings and function control of the device.
  • the output device 204 may include a display device such as a display screen.
  • the communication device 205 may include a receiver and a transmitter.
  • the communication device 205 is configured to transmit and receive information according to the control of the processor 201.
  • the processor 201 executes various functional applications and data processing by running programs stored in the system memory 202, such as implementing the network switching method provided by the embodiments of the present application, so
  • the method is applied to the first communication node and includes: sending a handover demand message to the core network, where the handover demand message carries UE context reference information on the source side; and receiving a handover control message sent by the core network, where the The handover control message carries UE context retention information on the source side, where the UE context retention information on the source side is used to instruct the source side network node not to release the resources used by the UE, and the UE context on the source side The retention information is determined by the UE context reference information on the source side.
  • processor 201 may also implement the technical solution of the network handover information method provided by any embodiment of the present application.
  • the hardware structure and function of the device please refer to the content explanation of this embodiment.
  • the processor 201 executes various functional applications and data processing by running programs stored in the system memory 202, such as implementing a network switching method provided by an embodiment of the present application
  • the method is applied to the second communication node and includes: receiving a handover request message sent by a core network, wherein the handover request message carries UE context reference information on the source side; and sending a handover request notification message to the core network , Wherein the handover request notification message carries UE context retention information on the source side, wherein the UE context retention information on the source side is used to instruct the source side network node not to release the resources used by the UE, The UE context retention information on the source side is determined by the UE context reference information on the source side.
  • processor 201 may also implement the technical solution of the network switching method provided by any embodiment of the present application.
  • the hardware structure and function of the device please refer to the content explanation of this embodiment.
  • the processor 201 executes various functional applications and data processing by running programs stored in the system memory 202, for example, to implement a network switching method provided in the embodiment of the present application , Including: receiving a third message, wherein the third message carries radio resource indication information; and reserving part or all of the radio resources of the source cell according to the radio resource indication information.
  • processor 201 may also implement the technical solution of the network switching method provided by any embodiment of the present application.
  • the hardware structure and function of the device please refer to the content explanation of this embodiment.
  • An embodiment of the present application also provides a storage medium containing computer-executable instructions, when the computer-executable instructions are executed by a computer processor, are used to perform a network switching method, the method being applied to a first communication node, including : Send a handover demand message to the core network, where the handover demand message carries UE context reference information on the source side; receive a handover control message sent by the core network, where the handover control message carries the UE on the source side Context retention information, where the UE context retention information on the source side is used to instruct the source side network node not to release resources used by the UE, and the UE context retention information on the source side is referenced by the UE context on the source side The information is OK.
  • An embodiment of the present application provides a storage medium containing computer-executable instructions.
  • the computer-executable instructions are used to implement the operations of the network switching method not limited to the above, and can also be used to implement the operations provided by any embodiment of the present application. Related operations in the network switching method.
  • An embodiment of the present application also provides a storage medium containing computer-executable instructions, when the computer-executable instructions are executed by a computer processor, are used to perform a network switching method, the method being applied to a second communication node, including : Receive a handover request message sent by the core network, where the handover request message carries UE context reference information on the source side; send a handover request notification message to the core network, where the handover request notification message is carried in The UE context retention information on the source side, where the UE context retention information on the source side is used to instruct the source side network node not to release the resources used by the UE, and the UE context retention information on the source side is controlled by the source side network node.
  • the UE context reference information is determined.
  • An embodiment of the application provides a storage medium containing computer-executable instructions.
  • the computer-executable instructions are used to implement the operations of the network switching method that are not limited to the above, and can also be used to execute the operations provided by any embodiment of the application. Related operations in the network switching method.
  • An embodiment of the present application also provides a storage medium containing computer-executable instructions, when the computer-executable instructions are executed by a computer processor, used to perform a network switching method, including: receiving a third message, wherein the The third message carries radio resource indication information; part or all of the radio resources of the source cell are reserved according to the radio resource indication information.
  • An embodiment of the present application provides a storage medium containing computer-executable instructions.
  • the computer-executable instructions are used to implement the network switching method operations that are not limited to the above, and can also be used to implement the network provided by any embodiment of the present application. Related operations in the switching method.
  • this application can be implemented by software and general-purpose hardware, and of course, it can also be implemented by hardware.
  • the technical solution of the present application can essentially be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, a read-only memory (Read-Only Memory, ROM). ), Random Access Memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including multiple instructions to make a computer device (which can be a personal computer, server, or network device, etc.) execute this Apply for the methods described in each embodiment.
  • a computer-readable storage medium such as a computer floppy disk, a read-only memory (Read-Only Memory, ROM). ), Random Access Memory (RAM), flash memory (FLASH), hard disk or optical disk, etc.
  • user terminal encompasses any suitable type of wireless user equipment, such as a mobile phone, a portable data processing device, a portable web browser, or a vehicle-mounted mobile station.
  • the various embodiments of the present application can be implemented in hardware or dedicated circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software that may be executed by a controller, microprocessor, or other computing device, although the present application is not limited thereto.
  • Computer program instructions can be assembly instructions, Instruction Set Architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or written in any combination of one or more programming languages Source code or object code.
  • ISA Instruction Set Architecture
  • the block diagram of any logic flow in the drawings of the present application may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions.
  • the computer program can be stored on the memory.
  • the memory can be of any type suitable for the local technical environment and can be implemented using any suitable data storage technology, such as but not limited to read only memory (ROM), random access memory (RAM), optical storage devices and systems (digital multi-function optical discs) (Digital Video Disc, DVD) or Compact Disc (CD)), etc.
  • Computer-readable media may include non-transitory storage media.
  • the data processor can be of any type suitable for the local technical environment, such as but not limited to general-purpose computers, special-purpose computers, microprocessors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (Application Specific Integrated Circuits, ASIC), programmable logic devices (Field Programmable Gate Array, FPGA), and processors based on multi-core processor architecture.
  • DSP Digital Signal Processors
  • ASIC Application Specific Integrated Circuits
  • FPGA Field Programmable Gate Array
  • processors based on multi-core processor architecture such as but not limited to general-purpose computers, special-purpose computers, microprocessors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (Application Specific Integrated Circuits, ASIC), programmable logic devices (Field Programmable Gate Array, FPGA), and processors based on multi-core processor architecture.

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Abstract

本申请提出一种网络切换方法、装置、设备及存储介质，所述方法应用于第一通信节点，包括：向核心网发送切换需求消息，其中，所述切换需求消息中携带在源侧的UE上下文参考信息；接收核心网发送的切换控制消息，其中，所述切换控制消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧的网络节点不要释放该UE所使用的资源，所述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。

Description

网络切换方法、装置、设备及存储介质 技术领域
本申请涉及通信技术领域，例如涉及一种网络切换方法、装置、设备及存储介质。
背景技术
用户设备(User Equipment，UE)切换后的目标第五代移动通信技术(5th Generation mobile communicaton technology，5G)基站可以与切换前的演进通用陆地无线电接入新无线电-双连接(Evolved Universal Terrestrial Radio Access and New Radio-Dual Connectivity，EN-DC)网络中的辅节点(Secondary Node，SN)是同一个5G基站，该UE可以继续使用原先的无线资源。UE切换后的EN-DC网络中的辅节点SN可以与切换前的5G基站是同一个5G基站，该UE可以继续使用原先的无线资源。如何使得UE切换前的5G基站可以获知切换前后是同一基站，并保留该UE的无线资源，是一个需要解决的问题。
发明内容
本申请提供用于网络切换的方法、装置、设备和存储介质。
本申请实施例提供一种网络切换方法，所述方法应用于第一通信节点，包括：向核心网发送切换需求消息，其中，所述切换需求消息中携带在源侧的UE上下文参考信息；接收核心网发送的切换控制消息，其中，所述切换控制消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧的网络节点不要释放该UE所使用的资源，所述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。
本申请实施例提供一种网络切换方法，所述方法应用于第二通信节点，包括：接收核心网发送的切换请求消息，其中，所述切换请求消息中携带在源侧的UE上下文参考信息；向所述核心网发送切换请求告知消息，其中，所述切换请求告知消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧的网络节点不要释放该UE所使用的资源，所述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。
本申请实施例提供一种网络切换方法，所述方法应用于第三通信节点，包括：接收第三消息，其中，所述第三消息中携带无线资源指示信息；根据无线资源指示信息保留源小区的部分或者全部无线资源。
本申请实施例提供一种网络切换装置，所述装置配置于第一通信节点，包括：第一发送模块，被配置为向核心网发送切换需求消息，其中，所述切换需求消息中携带在源侧的UE上下文参考信息；第一接收模块，被配置为接收核心网发送的切换控制消息，其中，所述切换控制消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧的网络节点不要释放该UE所使用的资源，所述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。
本申请实施例提供一种网络切换装置，所述装置配置于第二通信节点，包括：第二接收模块，被配置为接收核心网发送的切换请求消息，其中，所述切换请求消息中携带在源侧的UE上下文参考信息；第二发送模块，被配置为向所述核心网发送切换请求告知消息，其中，所述切换请求告知消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源测的网络节点不要释放该UE所使用的资源，所述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。
本申请实施例提供一种网络切换装置，所述装置配置于第三通信节点，包括：第三接收模块，被配置为接收第三消息，其中，所述第三消息中携带无线资源指示信息；保留模块，被配置为根据无线资源指示信息保留源小区的部分或者全部无线资源。
本申请实施例提供一种设备，所述设备包括：一个或多个处理器；存储器，用于存储一个或多个程序；当所述一个或多个程序被所述一个或多个处理器执行时，使得所述一个或多个处理器实现本申请实施例中的任意一种方法。
本申请实施例提供了一种存储介质，所述存储介质存储有计算机程序，所述计算机程序被处理器执行时实现本申请实施例中的任意一种方法。
关于本申请的以上实施例和其他方面以及其实现方式，在附图说明、具体实施方式和权利要求中提供更多说明。
附图说明
图1是5G网络架构的示意图；
图2是相关技术中的EN-DC架构的示意图；
图3为本申请实施例提供的一种网络切换方法的流程示意图；
图4为本申请实施例提供的一种网络切换方法的流程示意图；
图5为本申请实施例提供的一种网络切换方法的流程示意图；
图6是本申请实施例提供的UE从独立(Stand Alone，SA)5G网络切换到EN-DC网络的流程图；
图7是本申请实施例提供的UE从EN-DC网络切换到SA 5G网络的流程图；
图8为本申请实施例提供的一种终端发起语音呼叫时在4G和5G、以及5G SA/非独立(Non-Stand Alone，NSA)模式间切换的方法的流程图；
图9为本申请实施例提供的一种终端发起语音呼叫时在4G和5G、以及5G SA/NSA模式间切换的方法的流程图；
图10为本申请实施例提供的一种终端发起语音呼叫时在4G和5G、以及5G SA/NSA模式间切换的方法的流程图；
图11为本申请实施例提供的一种终端发起语音呼叫时在4G和5G、以及5G SA/NSA模式间切换的方法的流程图；
图12为本申请实施例提供的一种终端发起语音呼叫时在4G和5G、以及5G SA/NSA模式间切换的方法的流程图；
图13为本申请实施例提供的一种终端基于当前网络的测量报告进行网络切换的方法的流程图；
图14为本申请实施例提供的一种终端基于当前网络的测量报告进行网络切换的方法的流程图；
图15为本申请实施例提供的一种终端基于当前网络的测量报告进行网络切换的方法的流程图；
图16为本申请实施例提供的一种终端基于当前网络的测量报告进行网络切换的方法的流程图；
图17为本申请实施例提供的一种网络切换装置的结构示意图；
图18为本申请实施例提供的一种网络切换装置的结构示意图；
图19为本申请实施例提供的一种网络切换装置的结构示意图；
图20是本申请实施例提供的一种设备的结构示意图。
具体实施方式
下文中将结合附图对本申请的实施例进行说明。
在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行。虽然在流程图中示出了逻辑顺序，但是在一些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。
5G网络的基站(NG-RAN node，下一代节点B(next generation NodeB，gNB))可以支持大容量业务(如：移动宽带(Mobile Broad Band，MBB))。图1是5G网络架构示意图。如图1所示，5G网络包括5G核心网(5G Core，5GC)和5G基站gNB。5GC包含接入移动功能(Access Mobility Function，AMF)节点，会话管理功能(Session Management Function，SMF)节点和用户面功能(User Plane Function，UPF)节点等网元节点。5G基站也称为：gNB，下一代无线接入网(Next Generation Radio Access Network，NG-RAN)节点。5G基站采用全新物理层空口设计，全新物理层空口支持新空口(New Radio，NR)，NR无线电接入技术(Radio Access Technology，RAT)制式基站，以及相关的基站网元接口。5G基站通过标准化的下一代(Next Generation，NG)接口，和5GC相互连接(包含下一代控制面(Next Generation-Control plane，NG-C)(信令)连接和下一代用户面(Next Generation-User plane，NG-U)(用户数据)连接)，而NG-RAN基站(gNB或下一代演进节点B(next generation-evolved NodeB，ng-eNB))之间通过Xn接口相互连接(包含Xn控制面(Xn-Control plane，Xn-C)连接和Xn用户面(Xn-User plane，Xn-U)连接)。
5G可以提供MBB业务，但5G网络可能不支持语音业务(Voice service)，即：不支持5G接入下的语音通话界面(Voice over New Radio，VoNR)功能。在这种情况下，连接到5G网络的移动终端也称为用户设备(User Equipment，UE)，需要切换到4G(长期演进(Long Term Evolution，LTE))网络中建立语音业务，4G网络一般地都支持基于长期演进的语音(Voice over Long Term Evolution，VoLTE)功能。
4G网络包括4G核心网，即演进的分组核心网(Evolved Packet Core，EPC)和4G无线接入网(Long Term Evolution Radio Access Network，LTE RAN)，其中，EPC包含移动管理实体(Mobility Management Entity，MME)节点，服务网关(Serving Gateway，SGW)节点，公用数据网(Public Data Network，PDN)网关(PDN Gateway，PGW)节点等基本网元节点，而4G无线接入网络(Radio Access Network，RAN)包括演进节点B(evolved Node B，eNB)和相关的基站网元之间的接口。
为了同时支持移动终端的语音业务和MBB业务，提供了一种EN-DC的网络架构。图2是相关技术中的EN-DC架构的示意图，如图2所示，一个终端同时连接到一个eNB(4G基站，LTE基站)并作为主节点(Master Node，MN)和连接到一个gNB(5G基站，NR基站)并作为辅节点(Secondary Node，SN)。这个主节点eNB通过S1接口连接到4G核心网EPC，并通过X2接口连接到5G基站。而这个5G基站gNB还可以通过S1用户面(S1-User plane，S1-U)接口连接到EPC，也还可以通过X2用户面(X2-User plane，X2-U)接口连接到其 他5G基站。
在接入网中，将两个基站(如EN-DC架构中的一个4G基站和一个5G基站)以紧耦合的方式联合为UE提供通信服务的网络模式称为双连接(Dual Connectivity，DC)网络。如图2所示，这两个基站又分为主节点(MN，也称为第一网元)和辅节点(SN，也称为第二网元)。双连接网络的设计，可以提升一次会话的通信容量。
在UE从SA 5G网络切换到EN-DC网络的场景中，UE原先连接在SA 5G网络，该UE正在进行MBB业务，此时需要进行语音业务(如：接听语音电话，或者发起语音电话呼叫)，但该5G网络不能支持语音业务，该UE需要切换到LTE网络以建立VoLTE业务，该UE需要继续原先的MBB业务，所以该UE切换到EN-DC网络，在LTE RAN节点(node)建立VoLTE连接，在NG-RAN node建立原先的MBB业务连接。
在UE从EN-DC网络切换到SA 5G网络的场景中。UE原先连接在EN-DC网络，S-MN(源主节点(Source-Master Node)是LTE eNB)，S-SN(源辅节点(Source-Secondary Node)是gNB，也称为：NG-RAN node)，当UE结束VoLTE业务(如：挂断电话)且继续5G业务(如宽带流媒体业务，MBB业务)，该UE切换到SA 5G网络(Stand Alone NR)。
对于上述第一种场景，当UE切换后的EN-DC网络中的辅节点(SN)与该UE切换前的SA 5G基站是同一个相同基站，提供了一种方法使得该UE在该相同5G基站上的无线资源可以不释放而继续使用。对于上述第二种场景也提供了相似的方法。UE切换后的目标5G基站可以获知其与切换前的源5G基站是同一个5G基站，该UE可以继续使用原先的无线资源。
但并没有提供一个方法，使得UE切换前的5G基站可以获知这一点，并保留该UE的无线资源。UE切换前的源基站获知UE切换成功后就会释放该UE的无线资源，从而导致切换后的目标5G基站也无法继续使用该UE的无线资源。
本申请实施例提供一种用于网络切换的方法、装置、设备和存储介质，以实现UE切换后的目标5G基站可以获知其与切换前的源5G基站是同一个5G基站，该UE可以继续使用原先的无线资源。
在一个实施例中，本申请实施例提供一种网络切换方法，图3为本申请实施例提供的一种网络切换方法的流程示意图。该方法可以适用于网络切换前后UE继续使用原先的无线资源的情况。该方法可以由本申请提供的网络切换装置执行，该网络切换装置可以由软件和/或硬件实现，所述方法应用于第一通信节 点中。
如图3所示，本申请实施例提供的网络切换方法主要包括步骤S11和S12。
S11、向核心网发送切换需求消息，其中，所述切换需求消息中携带在源侧的UE上下文参考信息。
S12、接收核心网发送的切换控制消息，其中，所述切换控制消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧的网络节点不要释放该UE所使用的资源，所述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。
在本实施例中，所述第一通信节点可以理解为源侧的网络节点。如果网络切换是SA 5G网络切换到EN-DC网络，第一通信节点可以理解SA 5G网络中的NG-RAN node。如果网络切换是EN-DC网络切换到SA 5G网络，第一通信节点可以理解EN-DC网络中的辅节点，EN-DC网络中的辅节点也是5G基站。
在一个示例性的实施方式中，在网络切换是SA 5G网络切换到EN-DC网络的情况下，接收核心网发送的切换控制消息之前，所述方法还包括：接收第二通信节点发送的辅节点添加请求消息，其中，所述辅节点添加请求消息中携带所述在源侧的UE上下文参考信息；向所述第二通信节点发送辅节点添加告知消息，其中，所述辅节点添加告知消息用于告知目标节点该UE在EN-DC网络下建立双连接。
在一个示例性的实施方式中，所述在源侧的UE上下文参考信息包括：源下一代无线接入网节点(Source NG-RAN node)和/或无线接入网用户设备NG接口应用协议标识(Radio Access Network User Equipment Next Generation Application Protocol，RAN UE NGAP ID)。
在一个示例性的实施方式中，所述辅节点添加请求消息中携带的所述在源侧的UE上下文参考信息由核心网发送至第二通信节点。
在一个示例性的实施方式中，在网络切换是SA 5G网络切换到EN-DC网络的情况下，所述第一通信节点是SA 5G网络中的5G基站，所述第二通信节点是EN-DC网络中的LTE eNB。
在一个示例性的实施方式中，在网络切换是EN-DC网络切换到SA 5G网络的情况下，接收核心网发送的切换控制消息之后，所述方法还包括：向第二通信节点发送辅节点添加请求消息，其中，所述辅节点添加请求消息中携带所述在源侧的UE上下文参考信息；接收第二通信节点发送的辅节点添加告知消息，其中，所述辅节点添加告知消息用于告知该UE在EN-DC网络下建立双连接。
在一个示例性的实施方式中，在确定保留使用资源的情况下，发送第三消 息到第三通信节点，其中，所述第三消息中携带无线资源指示信息。
在一个示例性的实施方式中，在网络切换是SA 5G网络切换到EN-DC网络的情况下，向核心网发送UE释放完成消息之后，所述方法还包括：向第二通信节点发送UE释放消息，其中，所述UE释放消息用于指示第二通信节点释放与本节点的信令连接。
在一个示例性的实施方式中，所述在源侧的UE上下文参考信息包括：辅节点用户设备X2接口应用协议标识(Secondary Node User Equipment X2Application Protocol Identifier，SN UE X2AP ID)信息单元。
在一个示例性的实施方式中，在网络切换是EN-DC网络切换到SA 5G网络的情况下，所述第一通信节点是EN-DC网络中的LTE eNB，所述辅节点是SA 5G网络中的5G基站。
在一个实施例中，本申请实施例提供一种网络切换方法，图4为本申请实施例提供的一种网络切换方法的流程示意图。该方法可以适用于网络切换前后UE继续使用原先的无线资源的情况。该方法可以由本申请提供的网络切换装置执行，该网络切换装置可以由软件和/或硬件实现，所述方法应用于第二通信节点中。
如图4所示，本申请实施例提供的网络切换方法主要包括步骤S21和S22。
S21、接收核心网发送的切换请求消息，其中，所述切换请求消息中携带在源侧的UE上下文参考信息。
S22、向所述核心网发送切换请求告知消息，其中，所述切换请求告知消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧的网络节点不要释放该UE所使用的资源，所述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。
在本实施例中，在网络切换是EN-DC网络切换到SA 5G网络的情况下，所述第一通信节点是EN-DC网络中的LTE eNB，所述辅节点是SA 5G网络中的5G基站。在网络切换是SA 5G网络切换到EN-DC网络的情况下，所述第一通信节点是SA 5G网络中的5G基站，所述第二通信节点是EN-DC网络中的LTE eNB。
在一个示例性的实施方式中，在网络切换是SA 5G网络切换到EN-DC网络的情况下，接收核心网发送的切换请求消息之后，所述方法还包括：向第一通信节点发送辅节点添加请求消息，其中，所述辅节点添加请求消息中携带所述在源侧的UE上下文参考信息；接收所述第一通信节点发送的辅节点添加告知消 息，其中，所述辅节点添加告知消息用于告知目标节点该UE在EN-DC网络下建立双连接。
在一个示例性的实施方式中，在网络切换是EN-DC网络切换到SA 5G网络的情况下，所述方法还包括：接收第一通信节点发送的辅节点添加请求消息，其中，所述辅节点添加请求消息中携带所述在源侧的UE上下文参考信息；向第一通信节点发送辅节点添加告知消息，其中，所述辅节点添加告知消息用于告知该UE在EN-DC网络下建立双连接。
在一个示例性的实施方式中，在网络切换是SA 5G网络切换到EN-DC网络的情况下，所述方法还包括：接收第一通信节点发送的UE释放消息，其中，所述UE释放消息用于指示本节点释放与第一通信节点的信令连接。
在一个实施例中，本申请实施例提供一种网络切换方法，图5为本申请实施例提供的一种网络切换方法的流程示意图。该方法可以适用于网络切换前后UE继续使用原先的无线资源的情况。该方法可以由本申请提供的网络切换装置执行，该网络切换装置可以由软件和/或硬件实现，所述方法应用于第三通信节点中。
如图5所示，本申请实施例提供的网络切换方法主要包括步骤S31和S32。
S31、接收第三消息，其中，所述第三消息中携带无线资源指示信息。
S32、根据无线资源指示信息保留源小区的部分或者全部无线资源。
在一个示例性的实施方式中，所述第三消息为第一通信节点发送。
在一个示例性的实施方式中，所述第三消息是无线资源控制(Radio Resource Control，RRC)重配消息，或，第三消息是无线控制消息。
在一个示例性的实施方式中，所述无线资源指示信息包括：源小区保留指示信息，或辅小区信息，或保留协议数据单元(Protocol Data Unit，PDU)会话信息，或者非接入层(Non-Access Stratum，NAS)资源保留指示，或者挂起指示，QoS流保留信息。
在一个示例性的实施方式中，所述QoS流保留信息用于指示网络切换之后，保留QoS流或QoS流信息。
在一个示例性的实施方式中，所述源小区保留指示信息用于指示网络切换之后，保留源小区的部分或者全部无线资源。
在一个示例性的实施方式中，基于辅小区信息与源小区信息的关系，网络切换之后，保留源小区的部分或者全部无线资源。
在一个示例性的实施方式中，所述辅小区信息为单个辅小区的信息或者辅小区列表。
在一个示例性的实施方式中，所述NAS资源保留指示用于指示网络切换之后，保留源小区的部分或者全部NAS资源，其中，部分或者全部NAS资源包括如下一个或多个：UE的注册状态，跟踪区更新(Tracking Area Updating，TAU)信息，完整性和加密信息。
在一个示例性的实施方式中，所述挂起指示用于指示网络切换之后，保留源小区的部分或者全部无线资源。
在一个示例性的实施方式中，所述部分或者全部无线资源包括：部分或者全部无线连接，其中，所述无线连接包括以下至少之一：RRC连接、信令无线承载(Siganling Radio Bearer，SRB)、数据无线承载(Data Radio Bearer，DRB)、PDU会话上下文，NAS层连接。
在一个示例性的实施方式中，所述部分或者全部无线资源包括：部分或者全部无线配置，其中，所述无线配置包括以下至少之一：第一层(Layer 1，L1)(物理层)配置，介质访问控制(Media Access Control，MAC)层配置，无线链路层控制(Radio Link Control，RLC层)配置，RRC层配置，分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)层配置，NAS层配置。
在一个示例性的实施方式中，所述保留PDU会话信息用于指示网络切换之后，保留PDU会话。
在一个示例性的实施方式中，所述保留PDU会话信息包括：PDU会话保留指示信息，或，需保留的PDU会话的信息列表；其中，所述PDU会话的信息列表包括一个或多个PDU会话的信息。
在一个示例性的实施方式中，保留部分或者全部的无线资源包括：继续使用下行带宽部分(BandWidth Part，BWP)；根据下行控制信息(Downlink Control Information，DCI)中的资源指示值(Resource Indicate Value，RIV)指示信息接收物理下行共享信道(Physical Downlink Shared CHannel，PDSCH)发送的下行数据。
在一个示例性的实施方式中，如果满足
Figure PCTCN2021087363-appb-000001
则
Figure PCTCN2021087363-appb-000002
如果不满足
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则
Figure PCTCN2021087363-appb-000004
其中，L CRBs为连续RB的长度，
Figure PCTCN2021087363-appb-000005
为下行带宽RB数，RB start为所述下行带宽中的起始资源块。
在一个示例性的实施方式中，保留部分或者全部的无线资源包括：保留UE的小区无线网络临时标识(Cell-Radio Network Temporary Identifier，C-RNTI)， 其中，所述UE的C-RNTI用于接收DCI信息。
在一个示例性的实施方式中，保留部分或者全部的无线资源包括：保留物理上行控制信道(Physical Uplink Control Channel，PUCCH)的资源分配方式；和/或，分配的PUCCH资源集合。
在一个示例性的实施方式中，保留部分或者全部的无线资源包括：保留一个或者多个数据无线承载(DRB)；保留一个或者多个信令无线承载(SRB)；将SRB1或者SRB2中的一个修改为SRB3。
在一个示例性的实施方式中，保留部分或者全部的无线资源包括：继续使用原有的PDU会话进行数据传输；或，在第一通信节点发起PDU会话后，重建恢复数据连接。
在一个示例性的实施方式中，保留部分或者全部的无线资源包括：使用网络切换前的安全上下文。
在一个示例性的实施方式中，保留部分或者全部的无线资源包括：保留专用控制信道(Dedicated Control Channel，DCCH)。
在一个示例性的实施方式中，保留DCCH包括：继续根据所述DCCH发送和接收数据。
在一个示例性的实施方式中，保留部分或者全部的无线资源包括：保留部分或者全部的QOS流或QOS流信息。
在一个示例性的实施方式中，保留QOS流或者QOS流信息包括：继续使用所述QOS流和/或QOS流信息进行用户面的数据发送和/或接收。
在一个应用性实施方式中，本实施例针对第一种场景(UE从SA 5G网络切换到EN-DC网络)的缺陷，提供了一种网络切换方法。
UE原先连接在SA 5G网络，该UE正在进行MBB业务，此时需要进行语音业务(如：接听语音电话，或者发起语音电话呼叫)，但该SA 5G网络不能支持语音业务，该UE需要切换到LTE网络以建立VoLTE业务(基于LTE的Voice)，该UE需要继续原先的MBB业务，所以该UE切换到EN-DC网络，在LTE RAN基站建立VoLTE连接，在NG-RAN基站建立原先的MBB业务连接。
图6是本申请实施例提供的UE从SA 5G网络切换到EN-DC网络的流程图，如图6所示，UE连接到源SA 5G网络的5G基站(S-gNB)，也称为源节点(S-node)，UE切换到的目标EN-DC网络中，T-MN(Target Master Node)是 LTE eNB,也称为MeNB(Master eNB)，T-SN(Target Secondary Node)是5G基站，也就是NG-RAN node。当目标NG-RAN node就是原先的NR node时，进行如下流程：
步骤601：源节点S-node(图2中的S-gNB)发送切换需求消息(Handover required message)到核心网(core network，CN)。切换需求消息中包括在源侧的UE上下文参考(UE context reference at Source)信息，其中，该信息包含在该消息的现有信息单元(Information Element，IE)的源到目标透明容器(Source To Target transparent Container)之中。
UE context reference at Source唯一标识了该UE在NG接口的关联关系和该UE在源节点(NG-RAN node)的关联关系(uniquely identifies a UE association over an NG interface and the source NG-RAN node.)。在第一种场景中，因为源节点是gNB，且该gNB连接到5GC，所以UE context reference at Source可以用Source NG-RAN node(全球唯一标识)和RAN UE NGAP ID的组合来共同标识。即：UE context reference at Source包括Source NG-RAN node或RAN UE NGAP ID中任意一种或者多种的组合。
步骤602：T-MN(目标节点，Target Master NG-RAN Node)从核心网接收到切换请求消息(Handover request message)，其中，切换请求消息中包括UE context reference at Source信息，该信息包含在该消息的信息单元Source To Target transparent Container中。
UE context reference at Source信息携带在Source To Target transparent Container中，CN从S-node接收到UE context reference at Source信息之后，直接将UE context reference at Source信息发送到T-MN。
步骤603：T-MN发送辅节点添加请求(SN addition request)消息到T-SN。当T-MN判断T-SN与S-node是同一个node，并决定继续使用S-node上的该UE的无线资源时，所述辅节点添加请求消息中包括UE context reference at Source信息或者RAN UE NGAP ID信息。T-SN根据这个信息，找到该UE在源节点的UE上下文(UE context)，并继续使用该UE在源侧的资源。
步骤604：T-SN发送辅节点添加请求告知(SN addition request acknowledge)消息到T-MN，通知T-MN该UE在EN-DC网络下建立了双连接。
步骤605：T-MN发送切换请求告知(Handover request Acknowledge)消息到核心网。当T-MN通过步骤603和604，获知该UE成功建立了T-SN，且T-SN继续使用S-node上的该UE的资源，该切换请求告知消息中包括在源侧的UE上下文保持(UE context at source kept)信息，该信息包含在Target to Source  transparent container中。
UE context at source kept信息，是指该UE在源节点的UE资源将在切换后的目标节点继续使用，目标节点用该信息通知源节点，不要删除该UE在源节点的资源。
步骤606：S-node接收到来自核心网的切换控制(Handover command)消息，其中，切换控制消息中包括UE context at source kept信息，该UE context at source kept信息包含在Target to Source transparent container中。
UE context at Source kept信息携带在Target to Source transparent container中，CN从T-MN接收到UE context at source kept信息之后，直接将UE context at source kept信息发送到S-node。
步骤607：UE在空口同步到目标基站，即：UE与T-MN和T-SN建立双连接，UE在T-MN上建立VoLTE业务，在T-SN继续完成MBB业务。
步骤608：T-MN向核心网发送切换通知(Handover notify)消息，该切换通知消息用于通知核心网已经将该UE切换到目标基站。
步骤609：S-node接收到来自核心网的UE释放控制(UE release command消息)。S-node释放其与CN之间的信令连接(即：释放NG接口)，但不释放该UE的资源。这是因为S-node在步骤606接收到的消息中包括UE context at source kept的指示信息，则S-node获知该UE在源5G基站的无线资源被目标基站继续使用。
步骤6010：S-node向核心网发送UE上下文释放完成(UE release complete)消息。
在上述应用性实施例中，从源节点(S-node)的角度来看，源节点主要执行下述操作：通过核心网，S-node将UE切换到目标节点，S-node向核心网发送和从核心网接收以下消息。
步骤1：发送Handover required消息，消息中包括UE context reference at Source信息；该信息唯一标识该UE在源节点的UE资源。
步骤2：接收Hanover command消息，消息中包括UE context at source kept信息。该信息通知源节点不要释放该UE在源节点的UE资源。
步骤3：接收UE release comman消息，源节点释放其与核心网的连接，但不释放该UE在源节点的UE资源。
步骤4：发送UE release comple消息，通知核心网已经释放了源节点与核心网的连接。
在上述应用性实施例中，从目标节点(T-MN)的角度来看，目标节点主要执行下述操作。
目标主节点(T-MN)向核心网发送和从核心网接收如下消息，向目标辅节点发送和接收如下消息。
步骤1：接收到来自核心网的Handover request消息，消息中包括UE context Reference at Source信息；
步骤2/3：根据UE context Reference at Source信息，T-MN选择的T-SN就是S-node，并通过步骤2/3为该UE建立EN-DC双连接；
步骤4：向核心网发送Handover request acknowledge消息，消息中包括UE context at Source kept信息，表示该UE在源节点的UE资源需要保留，并被目标辅节点继续使用。
步骤5：当UE同步到目标节点后，向核心网发送Handover notify消息，通知核心网已经将该UE切换到目标节点。
在一个应用性的实施方式中，本实施例针对第二种场景(UE从EN-DC网络切换到SA 5G网络)的缺陷，提供了一种网络切换方法。
UE原先连接在EN-DC网络，比如该UE一边打电话一边进行MBB业务。S-MN(源主节点(Master Node)是LTE eNB)，S-SN(源辅节点(Secondary Node)是gNB，也称为：NG-RAN node)，当UE结束VoLTE业务(如：挂断电话)且继续5G业务(如宽带流媒体业务，MBB业务)时，该UE从EN-DC网络切换到SA 5G网络(Stand Alone NR)。
图7是本申请中UE从EN-DC网络切换到SA 5G网络的流程图，如图7所示，当S-SN节点与T-MN节点是同一个NG-RAN node，则进行如下流程：
步骤71：S-MN(源主节点，如：MeNB node)发送切换需求消息(Handover required message)到核心网(core network，CN)，消息中包括在源测的上下文参考(UE context reference at Source)信息单元(IE)，该信息单元包含在Source To Target transparent Container中。
在第二种场景中，因为源辅节点是指EN-DC网络中的S-SN，且该S-SN连接到S-MN，所以UE context reference at Source可以用SN UE X2AP ID信息单元来标识。
步骤72：T-node(目标节点，Target NG-RAN node)从核心网接收到切换请求消息(Handover request message)，其中，切换请求消息中包括UE context  reference at Source信息，该信息包含在Source To Target transparent Container中。
步骤73：T-node发送切换请求告知(Handove request acknowledge)消息，消息中包括在源测的UE上下文保持(UE context at Source kept)信息。当T-node判断其与S-SN是同一个NG-RAN node，并决定继续使用S-SN上的UE资源，则所述消息中包括所述指示信息，该信息包含在Target to Source transparent container中。
步骤74：S-MN接收到核心网发送的切换控制(Handover command)消息，消息中包括UE context at Source kept信息。
步骤75：S-MN向S-SN发送辅节点释放请求(SN release request)消息，消息中包括UE context at Source kept信息。
步骤76：S-SN向S-MN发送辅节点释放请求告知(SN release request acknowledge)消息。
步骤77：UE在空口同步到目标基站，即：UE与T-node建立连接，UE在SA 5G基站继续进行MBB业务。
步骤78：T-node向核心网发送切换通知(Handover notify)消息，通知核心网已经将该UE切换到目标基站(T-node)。
步骤79：S-MN接收到来自核心网的UE释放控制(UE release command)消息。S-MN释放其与CN的连接(即：释放S1接口)。
步骤710：S-MN向核心网发送UE释放完成(UE release complete)消息。
步骤711：S-MN向S-SN发送UE释放(UE release)消息。S-SN接收到消息后，S-SN释放与M-SN的信令连接，但保持该UE在S-SN上的资源，以便于T-MN可以继续使用。
在上述应用性实施例中，从源节点(S-MN)的角度来看，源节点主要执行下述操作。
源主节点向核心网发送和从核心网接收如下消息；向源辅节点发送和从源辅节点接收如下消息。
步骤1：向核心网发送Handover required消息，消息中包括UE context reference at Source信息；该信息唯一标识该UE在源辅节点的UE资源。
步骤2：从核心网接收Hanover command消息，消息中包括UE context at source kept信息。该信息通知源辅节点(S-SN)不要释放该UE在源辅节点的UE资源。
步骤3：向S-SN发送SN release request消息，消息中包括UE context at source kept信息，通知源辅节点(S-SN)不要释放该UE在源辅节点的UE资源。
步骤4：从S-SN接收SN release request acknowledge消息，获知S-SN释放与源主节点的X2连接。
在上述应用性实施例中，从目标节点(T-node)的角度来看，目标节点主要执行下述操作。
通过核心网，T-node向核心网发送和从核心网接收以下消息。
步骤1：接收Handover request message，消息中包括UE context reference at Source信息。
步骤2：发送Handove request acknowledge消息，当T-node判断T-node与S-SN是同一个NG-RAN node，并决定继续使用S-SN上的UE资源时，消息中包括UE context at Source kept信息。
步骤3：UE在空口同步到目标基站，即：UE与T-node建立连接，UE在SA 5G基站继续进行MBB业务。
步骤4：T-node向核心网发送Handover notify消息，通知核心网已经将该UE切换到目标基站(T-node)。
在一个应用性实施方式中，图8为本申请实施例提供的一种终端发起语音呼叫时在4G和5G、以及5G SA/NSA模式间切换的方法的流程图。
本实施例为终端与上述实施例中目标RAN节点和源网络的RAN节点之间的操作；本实施例涉及到三个网络节点，网络节点1为UE；网络节点2为UE当前驻留的网络节点NR gNB；网络节点3为UE切换的目标网络RAN网络节点的演进的通用陆面无线接入(Evolved-Universal Terrestrial Radio Access，E-UTRA)eNB。
S801、处于RRC连接态的UE向所属源网络的RAN节点gNB主动发起网际互连协议多媒体子系统(Internet protocol Multimedia Subsystem，IMS)语音呼叫业务。
S802、所述CN发现当前5G系统(5G System，5GS)不支持IMS语音业务后，gNB发送来自NR的移动控制(MobilityFromNRCommand)消息通知UE切换到EN-DC网络中；所述MobilityFromNRCommand消息中包含辅小区或小区组信息(NR)。
S803、终端根据所述MobilityFromNRCommand发起到E-UTRA的切换。 如果终端发现所述辅小区或小区组信息与源网络节点gNB的小区或者小区组信息一致；在完成到所述E-UTRA的小区网络节点eNB切换后；保留与源网络节点gNB的部分或者全部的无线连接、或者部分或者全部的无线配置、或者部分或者全部的PDU会话SEESION。
S804、所述EN-DC网络通过所述保留的部分无线连接或者无线配置或者保留的部分或者全部PDU SESSION进行数据的传输。
其中，所述UE在接收到所述携带0到多个辅小区或者小区组信息的MobilityFromNRCommand消息后，如果其中一个小区或者小区组信息与源小区的小区信息或者小区组信息一致或者使用同一网络节点gNB；UE不发起与所述辅小区或者小区组的网络节点gNB无线配置或者无线连接建立请求。
其中，所述UE在接收到所述MobilityFromNRCommand消息后，如果所述0到多个辅小区或者小区组信息中的一个小区或者小区组信息与源小区的小区信息或者小区组信息一致或者使用同一网络节点gNB；UE保留与源小区的S-MN网络节点gNB的部分或者全部无线配置或者部分或者全部无线连接。
所述UE在接收到携带主小区或者小区组信息的所述MobilityFromNRCommand消息后，如果其中一个小区或者小区组信息与源小区的小区信息或者小区组信息一致或者使用同一网络节点gNB；UE保留与源小区的S-MN网络节点gNB的部分或者全部无线资源。
其中，所述部分或者全部连接包括：RRC连接；部分或者全部的SRB；部分或者全部的DRB。
其中，所述部分或者全部无线资源包括：L1(物理层)资源，MAC资源，SRB，DRB，PDCP实体，服务数据适配协议(Service Data Adaptation Protocol，SDAP)实体。
其中，所述无线配置包括：部分或者全部的L1(物理层)配置，部分或者全部的MAC层配置，部分或者全部的RLC层配置，部分或者全部的RRC层配置；部分或者全部的PDCP层配置，部分或者全部NAS配置。
其中所示步骤S801发起语音呼叫业务包括以下处理：
终端经gNB发送invite消息到IMS服务器，IMS服务器经gNB发送100trying消息到UE，UE经gNB发送183 Session Progress到IMS服务器，IMS服务器发送临时确认(Provisional ACKnowledgement，PRACK)消息到UE，UE发送200OK消息到IMS服务器。
所述保留部分或者全部物理层配置包括：UE继续使用所述的下行BWP,并根据DCI中RIV指示信息接收PDSCH发送的下行数据。
Figure PCTCN2021087363-appb-000006
L CRBs为连续RB的长度，
Figure PCTCN2021087363-appb-000007
为下行带宽RB数，RB start为所述下行带宽中的起始资源块。
所述保留部分或者全部物理层配置包括：保留UE的C-RNTI，UE的C-RNTI用于DCI信息接收。
所述保留部分或者全部物理层配置包括：保留上行控制信道PUCCH的资源分配方式，和/或保留分配的PUCCH资源集合。
所述保留部分或者全部无线连接包括：保留一个或者多个DRB(数据无线承载)。
所述保留部分或者全部无线连接包括：保留一个或者多个SRB(信令无线承载)。
所述保留部分或者全部无线连接包括：将SRB1或者SRB2中的一个修改为SRB3。
所述保留部分或者全部NAS配置：包括保留UE的注册状态，和或TAU信息，和/或完整性和加密信息。
所述UE完成切换后，继续使用原有的PDU SESSION进行数据传输；或者在E-sgNB发起PDN连接的重建，恢复数据连接。
所述UE完成切换后，继续使用原有的PDU SESSION进行数据传输；或者在E-sgNB发起PDU SEESSION的重建，恢复数据连接。
在一个应用性实施方式中，图9为本申请实施例提供的一种终端发起语音呼叫时在4G和5G、以及5G SA/NSA模式间切换的方法的流程图。本实施例涉及到三个网络节点，网络节点1为UE；网络节点2为UE当前驻留的网络的NR g-NB；网络节点3为UE切换的目标网络的E-UTRA eNB.
S901、处理RRC连接态的UE向所述gNB主动发起IMS语音呼叫业务
S902、所述CN发现当前5GS不支持IMS语音业务后，eNB发送MobilityFromNRCommand消息通知UE切换到EN-DC网络中；所述MobilityFromNRCommand消息中包含保留源NR小区的指示信息。
S903、终端根据所述MobilityFromNRCommand发起到E-UTRA的切换；在完成到所述E-UTRA的小区切换后；保留部分或者全部的源NR小区的无线连接或者无线配置或者保留部分或者全部的PDU SESSION。
所述部分或者全部连接包括：RRC连接；以及相关的SRB、DRB。
所述部分或者全部无线资源包括：L1(物理层)资源，MAC资源，SRB，DRB，PDCP实体，SDAP实体。
所述无线配置包括：部分或者全部的L1(物理层)配置，部分或者全部的MAC层配置，部分或者全部的RLC层配置，部分或者全部的RRC层配置；部分或者全部的PDCP层配置，部分或者全部NAS配置。
S904、所述EN-DC网络通过所述保留的部分或者全部的无线连接或者无线配置或者PDU SESSION进行数据的传输。
在一个应用性的实施方式中，图10为本申请实施例提供的一种终端在4G和5G、以及5G SA/NSA模式间切换的方法的流程图。本实施例涉及到三个网络节点，网络节点1为UE；网络节点2为UE当前驻留的网络NR gNB；网络节点3为UE切换的目标网络的E-UTRA eNB。
S1001、处于RRC连接态的UE向所述gNB发送测量报告。
S1002、gNB发送MobilityFromNRCommand消息通知UE切换到EN-DC网络中；所述MobilityFromNRCommand消息中包含E-UTRA的T-MN信息(M-eNB)，以及保留源NR小区的指示信息。
S1003、终端根据所述MobilityFromNRCommand发起到E-UTRA的切换；在完成到所述E-UTRA的小区切换后；保留部分或者全部的源NR小区的无线承载。
所述保留部分或者全部源小区的无线承载包括：保留原有的部分或者全部的物理层资源配置，保留SRB1、SRB2和DRB中的部分或者全部的SDAP实体或者PDCP实体；保留NR网络中的全部或者部分PDU SESSION；针对全部或者部分PDU SESSION在EN-DC网络发起对应的PDN CONNECTION的连接重建。
S1004，所述eNB根据网络需求调度UE通过所述保留的部分SRB或者DRB或者PDU SESSION进行控制信令或者数据的传输。
在一个应用性的实施方式中，图11为本申请实施例提供的一种终端在4G和5G、以及5G SA/NSA模式间切换的方法的流程图。本实施例涉及到三个网络节点，网络节点1为UE；网络节点2为UE当前驻留的网络NR gNB；网络节点3为UE切换的目标网络的E-UTRA eNB。
S1101、处于RRC连接态的UE向所述gNB发送测量报告
S1102、eNB发送MobilityFromNRCommand消息通知UE切换到EN-DC网络中；所述MobilityFromNRCommand消息中包含E-UTRA的T-MN信息(M-eNB)，以及T-SN信息(gNB)
S1103、终端根据所述MobilityFromNRCommand发起到E-UTRA的切换；在完成到所述E-UTRA的小区切换后；如果所述T-SN为源NR小区(即T-SN为源NR小区的节点)；保留部分或者全部的源NR小区的无线承载。所述保留部分或者全部源小区的无线承载包括：保留原有的部分或者全部的物理层资源配置，或者保留SRB1、SRB2和DRB中的部分或者全部的SDAP实体或者PDCP实体；保留NR网络中的全部或者部分PDU SESSION；针对全部或者部分PDU SESSION在EN-DC网络发起对应的PDN CONNECTION的重建。
S1104、所述eNB根据网络需求调度UE通过所述保留的部分SRB或者DRB或者PDU SESSION进行控制信令或者数据的传输。
在一个应用性的实施方式中，图12为本申请实施例提供的一种终端语音呼叫被叫时在4G和5G、以及5G SA/NSA模式间切换的方法的流程图。本实施例涉及到三个网络节点，网络节点1为UE；网络节点2为UE当前驻留的网络的NR gNB；网络节点3为UE切换的目标网络的E-UTRA eNB。
S1201、CN尝试针对处于连接态的UE发起IMS被叫语音呼叫业务，发现5GS不支持IMS Voice业务后，eNB发送MobilityFromNRCommand消息通知处于连接态的UE切换到EN-DC网络中；所述MobilityFromNRCommand消息中包含E-UTRA的T-MN信息(M-eNB)，以及T-SN信息。
S1202、终端根据所述MobilityFromNRCommand发起到E-UTRA的切换；发送RRC重配(RRCRECONFIGURATION)消息到所述eNB。
如果终端发现所述T-SN信息为当前NR小区；在完成到所述E-UTRA的小区切换后；保留部分或者全部的源NR小区的无线资源。所述保留部分或者全部源小区的无线资源包括以下其中之一：保留原有的部分或者全部的物理层(L1)资源配置，保留SRB1、SRB2和DRB中的部分或者全部的SDAP实体或者PDCP实体；保留NR网络中的全部或者部分PDU SESSION；针对全部或者部分PDU SESSION在EN-DC网络不发起对应的PDN CONNECTION的连接重建。
S1203、所述EN-DC网络通过所述保留的部分SRB或者DRB或者PDU SESSION进行控制信令或者数据的传输。
在一个应用性的实施方式中，图13为本申请实施例提供的一种终端基于当 前网络的测量报告进行网络切换的方法的流程图，UE处于连接态连接在EN-DC5G网络，终端与NR节点gNB正在进行增强移动宽带(Enhanced Mobile Broadband，EMMB)业务，根据当前网络的测量报告，网络侧发现UE需要进行MN小区的切换；为了保证EMMB业务的连续性特别是PDU SESSION数据的连续性；切换流程如下：
S1301、eNB发送RRCConnectionReconfiguration消息通知UE切换到另一个EN-DC网络中；其中所述RRCConnectionReconfiguration消息中包含主小区或者小区组和0到多个辅小区或者小区组。
S1302、UE接收到所述RRCConnectionReconfiguration，发起到所述RRCConnectionReconfiguration中指明的目标EN-DC小区的切换，发送RRC连接重配完成(RRCConnectionReconfigurationComplete)消息到目标小区的eNB完成NR小区到EN-DC小区的切换。UE依据RRCConnectionReconfiguration中的辅小区或者小区组决定是否保留当前UE与源小区(S-MN,gNB)的全部或者部分PDU SESSION。如果所述主小区或者小区组和0到多个辅小区或者小区组与源小区或者小区组一致，则保留UE与源小区的部分或者全部的当前UE与源小区(S-MN,gNB)的全部或者部分PDU SESSION。
其中，切换后UE保留与源小区的S-MN的PDU SESSION；UE不发起基于该PDU SESSION的标识(Identifier，ID)和/或互联网协议(Internet Protocol，IP)地址和/或APN信息的新的PDU SESSION的建立请求；建立新的PDU SESSION。
所述UE通过保留的部分或者全部PDU SESSION接收和/或发送数据。
在一个应用性的实施方式中，图14为本申请实施例提供的一种终端基于当前网络的测量报告进行网络切换的方法的流程图，UE原先连接在SA 5G网络，该UE正在进行MBB业务，此时需要进行语音业务(如：接听语音电话，或者发起语音电话呼叫)，但该5G网络不能支持语音业务，该UE需要切换到LTE网络以建立VoLTE业务(基于LTE的Voice)，该UE需要继续原先的MBB业务，所以该UE切换到EN-DC网络，在LTE RAN node建立VoLTE连接，在NG-RAN node建立原先的MBB业务连接。
UE连接到源SA 5G网络的5G基站(S-gNB)，也称为源节点(S-node)，UE切换到的目标EN-DC网络中，T-MN(Target Master node)是LTE eNB,也称为MeNB(Master eNB)，T-SN(Target Secondary node)是5G基站，也就是NG-RAN node。当目标NG-RAN node就是原先的NR node时，切换流程如 下：
S1401、gNB发送MobilityFromNRCommand消息通知UE切换到EN-DC网络中；其中所述MobilityFromNRCommand消息中包含保留源小区(即源NR小区)的指示。
S1402、UE接收到所述MobilityFromNRCommand发起到目标EN-DC小区的切换，发送RRCConnectionReconfigurationComplete消息到目标小区的e-NB完成NR小区到EN-DC小区的切换。UE依据MobilityFromNRCommand中保留源小区的指示决定是否保留当前UE与源小区或者小区组(S-MN,gNB)的全部或者部分PDU SESSION。如果所示指示信息为保留源小区，则保留UE与源小区的辅节点S-SN的部分或者全部的当前UE与源小区(S-MN,gNB)的全部或者部分PDU SESSION。
S1403、EN-DC网络继续通过保留的PDU SESSION进行通信。
所述UE在接收到所述携带T-MN和保留源小区的指示信息的MobilityFromNRCommand消息后，如果所述指示信息为保留源小区；则针对保留的源小区的PDU SESSION不发起重建。
切换后UE保留与源小区的S-MN的PDU SESSION；UE不发起基于该PDU SESSION的ID和/或IP地址和/或APN信息的新的PDU SESSION的建立请求；建立新的PDU SESSION。
在一个应用性的实施方式中，图15为本申请实施例提供的一种终端基于当前网络的测量报告进行网络切换的方法的流程图，UE处于连接态连接在EN-DC5G网络，终端与NR节点gNB正在进行EMMB业务，根据当前网络的测量报告，网络侧发现UE需要进行MN小区的切换；为了保证EMMB业务的连续性，网络希望维持SN小区当前的无线配置或者无线连接
切换流程如下：
S1501、eNB发送RRCConnectionReconfiguration消息通知UE切换到另一个EN-DC网络中；其中所述RRCConnectionReconfiguration消息中包含辅小区或者小区组保留指示信息。
S1502、UE接收到所述RRCConnectionReconfiguration发起到目标EN-DC小区的切换，发送RRCConnectionReconfigurationComplete消息到目标小区的eNB完成NR小区到EN-DC小区的切换。UE依据RRCConnectionReconfiguration中辅小区或者小区组保留指示信息决定是否保留当前UE与源辅小区或者小区组的无线配置或者无线连接。如指示保留辅小区，则保留UE与源辅小区或者 小区组的部分或者全部的无线配置或者无线连接。
S1503、EN-DC网络通过所述T-MN以及源辅小区或者小区组的保留的部分或者全部无线配置或者无线连接与UE进行通信。
所述UE在接收到所述携带T-MN的辅小区保留指示信息的RRCConnectionReconfiguration消息后，如果所述指示信息指示保留辅小区，UE不发起与所述与源辅小区或者小区组的信息一致或者使用同一网络节点的辅小区或者小区组的无线配置或者无线连接的更新或者重建。
所述UE在接收到所述携带T-MN的辅小区保留指示信息的RRCConnectionReconfiguration消息后，如果所述指示信息指示保留辅小区，UE保留与源辅小区或者小区组的部分或者全部无线资源。
所述部分或者全部无线资源包括：L1(物理层)资源，MAC资源，SRB，DRB，PDCP实体，SDAP实体。
所述无线配置包括：部分或者全部的L1(物理层)配置，部分或者全部的MAC层配置，部分或者全部的RLC层配置，部分或者全部的RRC层配置；部分或者全部的PDCP层配置，部分或者全部NAS配置。
在一个应用性的实施方式中，图16为本申请实施例提供的一种终端基于当前网络的测量报告进行网络切换的方法的流程图，UE原先连接在SA 5G网络，该UE正在进行MBB业务，此时需要进行语音业务(如：接听语音电话，或者发起语音电话呼叫)，但该5G网络不能支持语音业务，该UE需要切换到LTE网络以建立VoLTE业务(基于LTE的Voice)，该UE需要继续原先的MBB业务，所以该UE切换到EN-DC网络，在LTE RAN node建立VoLTE连接，在NG-RAN node建立原先的MBB业务连接。
在NR网络中UE进行数据通信需要与网络建立PDU SESSION，在网络切换时为了保持数据连续性，一般UE在网络切换后会释放当前的PDU SESSION并在目标小区对应地建立新的PDU SESSION或者会话描述协议连接(Session Description Procotol CONNECTION，SDP CONNECTION)；此时PDU会话或者SDP CONNECTION的重建都会短暂中断数据传输；为了保证更高的数据连续性，在目标小区的T-SN与当前小区的S-MNRAN节点或者小区一致时流程如下：
S1601、gNB发送MobilityFromNRCommand消息通知UE切换到EN-DC网络中；所述MobilityFromNRCommand消息中包含PDU SESSION保留指示。
S1602、UE接收到所述MobilityFromNRCommand，发起到所述目标EN-DC 小区的切换,发送RRCConnectionReconfigurationComplete消息到目标小区的eNB。UE依据MobilityFromNRCommand中PDU保留指示信息决定是否保留当前UE与源小区或者小区组的节点(S-MN,gNB)的全部或者部分PDU SESSION。如果所示指示信息为保留源小区，则保留UE与源小区的辅节点S-SN的部分或者全部的当前UE与源小区或者小区组的节点(S-MN,gNB)的全部或者部分PDU SESSION。
S1603、EN-DC网络继续通过保留的PDU SESSION进行通信。
所述UE在接收到所述携带T-MN和保留PDU SESSION的指示信息的MobilityFromNRCommand消息后，如果所述指示信息为保留PDU；则针对保留的源小区的PDU SESSION不发起重建。
所述PDU SESSION保留指示信息，可以为保留PDU SESSION的指示，或者需要保留的PDU SESSION的信息的列表。
所述，切换后的UE保留与源小区的S-MN的PDU SESSION；UE不发起基于该PDU SESSION ID和/或IP地址和/或APN信息的新的PDU SESSION的建立请求；建立新的PDU SESSION。
在一个应用性的实施方式中，本实施例提供一种支持不同网络间切换的UE，UE进行如下操作：
UE接收NR的MobilityFromNRCommand消息，所述MobilityFromNRCommand消息中包含源小区保留指示信息、或者小区或者小区组信息。
UE根据所述的源小区保留指示信息、或者小区或者小区组信息与源小区或者小区组的关系决定是否保留源网络中的全部或者部分PDU SESSION。
UE继续通过保留的PDU SESSION进行通信。
所述切换后UE保留与源小区的S-MN的PDU SESSION；UE不发起基于该PDU SESSION的ID和/或IP地址和/或APN信息的新的PDU SESSION的建立请求；建立新的PDU SESSION。
在一个应用性的实施方式中，本实施例提供一种支持不同网络间切换的UE，UE进行如下操作；
UE接收NR的MobilityFromNRCommand消息，所述MobilityFromNRCommand消息中包含保留PDU SESSION信息。
UE根据所述的保留PDU SESSION信息决定是否保留源网络中的全部或者部分PDU SESSION。
UE继续通过保留的PDU SESSION进行通信。
所述切换后UE保留与源小区的S-MN的PDU SESSION；UE不发起基于该PDU SESSION的ID和/或IP地址和/或APN信息的新的PDU SESSION的建立请求；建立新的PDU SESSION.
所述保留PDU SESSION信息可以为：保留PDU session的指示；或者需要保留的PDU SESSION的信息列表；所述PDU SESSION的信息列表包含至少一个PDU SESSION的信息。
在一个应用性的实施方式中，一种支持不同网络间切换的网络节点(源节点)：发送MobilityFromNRCommand或RRCCONNECTION RECONFIGURATION消息，所述MobilityFromNRCommand或RRCCONNECTION RECONFIGURATION消息中包含源小区保留指示信息、或者小区或者小区组信息、或PDU SESSION保留信息或者DRB保留信息。
所述小区保留指示信息用来指示终端在切换后，保留源小区的全部或者部分的无线连接或者无线配置。
所述小区或者小区信息，可以用来指示终端在切换后，保留源小区的全部或者部分的无线连接或者无线配置。
所述小区保留指示信息，可以用来指示终端在切换后，保留源小区的全部或者部分的无线连接或者无线配置。
所述DRB保留信息用来指示终端小区切换后保留部分或者全部DRB。
所述小区或者小区信息，可以用来指示终端在切换后，保留源小区的全部或者部分无线资源配置或者全部或者部分无线连接或者全部或者部分PDU SEESSION。
所述PDU SESSION保留信息，用来指示终端保留保留源小区的全部或者部分无线资源配置或者全部或者部分无线连接或者全部或者部分PDU SEESSION。
在一个应用性的实施方式中，一种支持不同网络间切换的网络节点(目标网络核心网网元)：在接收到保留部分或者全部源小区无线连接或者无线资源的终端发送的RRCCONNECTION RECONFIGURATION消息后；网络通过保 留的部分或者全部无线连接或者无线配置进行数据通信。
在一个应用性的实施方式中，一种支持不同网络间切换的网络节点(目标网络核心网网元)：在接收到保留PDU SESSION的终端发送的RRCCONNECTION RECONFIGURATION消息后，网络通过保留的部分或者全部-PDU SESSION进行数据通信。
在一个实施例中，本申请实施例提供一种网络切换装置，图17为本申请实施例提供的一种网络切换装置的结构示意图。该装置可以适用于网络切换前后UE继续使用原先的无线资源的情况。该网络切换装置可以由软件和/或硬件实现，所述方法应用于第一通信节点中。
如图17所示，本申请实施例提供的网络切换装置主要包括第一发送模块171和第一接收模块172。
第一发送模块171，被配置为向核心网发送切换需求消息，其中，所述切换需求消息中携带在源侧的UE上下文参考信息。
第一接收模块172，被配置为接收核心网发送的切换控制消息，其中，所述切换控制消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧的网络节点不要释放该UE所使用的资源，所述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。
在一个示例性的实施方式中，在网络切换是SA 5G网络切换到EN-DC网络的情况下，第一接收模块172还被配置为在接收核心网发送的切换控制消息之前，接收第二通信节点发送的辅节点添加请求消息，其中，所述辅节点添加请求消息中携带所述在源侧的UE上下文参考信息；第一发送模块171还被配置为向所述第二通信节点发送辅节点添加告知消息，其中，所述辅节点添加告知消息用于告知目标节点该UE在EN-DC网络下建立双连接。
在一个示例性的实施方式中，所述在源侧的UE上下文参考信息包括：源5G无线接入网节点(Source NG-RAN node)和/或无线接入网终端NG接口应用协议标识(RAN UE NGAP ID)。
在一个示例性的实施方式中，所述辅节点添加请求消息中携带所述在源侧的UE上下文参考信息由核心网发送至第二通信节点。
在一个示例性的实施方式中，在网络切换是SA 5G网络切换到EN-DC网络的情况下，所述第一通信节点是SA 5G网络中的5G基站，所述第二通信是 EN-DC网络中的LTE eNB。
在一个示例性的实施方式中，在网络切换是EN-DC网络切换到SA 5G网络的情况下，第一发送模块171还被配置为在接收核心网发送的切换控制消息之后，向第二通信节点发送辅节点添加请求消息，其中，所述辅节点添加请求消息中携带所述在源侧的UE上下文参考信息；第一接收模块172还被配置为接收第二通信节点发送的辅节点添加告知消息，其中，所述辅节点添加告知消息用于告知该UE在EN-DC网络下建立双连接。
在一个示例性的实施方式中，第一发送模块171，被配置为在确定保留使用资源的情况下，发送第三消息到第三通信节点，其中，所述第三消息中携带无线资源指示信息。
在一个示例性的实施方式中，第一发送模块171，被配置为在网络切换是SA 5G网络切换到EN-DC网络的情况下，向核心网发送的UE释放完成消息之后，向第二通信节点发送UE释放消息，其中，所述UE释放消息用于指示第二通信节点释放与本节点的信令连接。
在一个示例性的实施方式中，所述在源侧的UE上下文参考信息包括：SN UE X2AP ID信息单元。
在一个示例性的实施方式中，在网络切换是EN-DC网络切换到SA 5G网络的情况下，所述第一通信节点是EN-DC网络中的LTE eNB，所述辅节点是SA 5G网络中的5G基站。
本实施例中提供的网络切换装置可执行本申请任意实施例所提供的网络切换方法，具备执行该方法相应的功能模块。未在本实施例中描述的技术细节，可参见本申请任意实施例所提供的网络切换方法。
上述网络切换装置的实施例中，所包括的各个单元和模块只是按照功能逻辑进行划分的，但并不局限于上述的划分，只要能够实现相应的功能即可；各功能单元的名称也只是为了便于相互区分，并不用于限制本申请的保护范围。
在一个实施例中，本申请实施例提供的一种网络切换装置，图18为本申请实施例提供的一种网络切换装置的结构示意图。该装置可以适用于网络切换前后UE继续使用原先的无线资源的情况。该网络切换装置可以由软件和/或硬件实现，所述方法应用于第二通信节点中。
如图18所示，本申请实施例提供的网络切换装置主要包括第二接收模块181和第二发送模块182。
第二接收模块181被配置为接收核心网发送的切换请求消息，其中，所述切换请求消息中携带在源侧的UE上下文参考信息；
第二发送模块182被配置为向所述核心网发送切换请求告知消息，其中，所述切换请求告知消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧的网络节点不要释放该UE所使用的资源，所述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。
在一个示例性的实施方式中，，第二发送模块182被配置为在网络切换是SA 5G网络切换到EN-DC网络的情况下接收核心网发送的切换请求消息之后，向第一通信节点发送的辅节点添加请求消息，其中，所述辅节点添加请求消息中携带所述在源侧的UE上下文参考信息；第二接收模块181被配置为接收所述第一通信节点发送的辅节点添加告知消息，其中，所述辅节点添加告知消息用于告知目标节点该UE在EN-DC网络下建立双连接。
在一个示例性的实施方式中，第二接收模块181被配置为在网络切换是EN-DC网络切换到SA 5G网络的情况下，接收第一通信节点发送的辅节点添加请求消息，其中，所述辅节点添加请求消息中携带所述在源侧的UE上下文参考信息；第二发送模块182被配置为向第一通信节点发送辅节点添加告知消息，其中，所述辅节点添加告知消息用于告知该UE在EN-DC网络下建立双连接。
在一个示例性的实施方式中，第二接收模块181，被配置为在网络切换是SA 5G网络切换到EN-DC网络的情况下，接收第一通信节点发送UE释放消息，其中，所述UE释放消息用于指示本节点释放与第一通信节点的信令连接。
本实施例中提供的网络切换装置可执行本申请任意实施例所提供的网络切换方法，具备执行该方法相应的功能模块。未在本实施例中描述的技术细节，可参见本申请任意实施例所提供的网络切换方法。
上述网络切换装置的实施例中，所包括的各个单元和模块只是按照功能逻辑进行划分的，但并不局限于上述的划分，只要能够实现相应的功能即可；各功能单元的名称也只是为了便于相互区分，并不用于限制本申请的保护范围。
在一个实施例中，本申请实施例提供的一种网络切换装置，图19为本申请实施例提供的一种网络切换装置的结构示意图。该装置可以适用于网络切换前后UE继续使用原先的无线资源的情况。该网络切换装置可以由软件和/或硬件实现，所述方法应用于第三通信节点中。
如图19所示，本申请实施例提供的网络切换装置主要包括第三接收模块191和保留模块192。
第三接收模块191，被配置为接收第三消息，其中，所述第三消息中携带无线资源指示信息。
保留模块192，被配置为根据无线资源指示信息保留源小区的部分或者全部无线资源。
在一个示例性的实施方式中，所述第三消息为第一通信节点发送。
在一个示例性的实施方式中，所述第三消息是RRC重配消息，或，第三消息是无线控制消息。
在一个示例性的实施方式中，所述无线资源指示信息包括：源小区保留指示信息，或辅小区信息，或保留PDU会话信息，或者NAS资源保留指示，或者挂起指示，或QoS流保留信息。
在一个示例性的实施方式中，所述QoS流保留信息用于指示网络切换之后，保留QoS流或QoS流信息。
在一个示例性的实施方式中，所述源小区保留指示信息用于指示网络切换之后，保留源小区的部分或者全部无线资源。
在一个示例性的实施方式中，基于辅小区信息与源小区信息的关系，网络切换之后，保留源小区的部分或者全部无线资源。
在一个示例性的实施方式中，所述辅小区信息为单个辅小区的信息或者辅小区的列表。
在一个示例性的实施方式中，所述NAS资源保留指示用于指示网络切换之后，保留源小区的部分或者全部NAS资源，其中，部分或者全部NAS资源包括如下一个或多个：UE的注册状态，TAU信息，以及完整性和加密信息。
在一个示例性的实施方式中，所述挂起指示用于指示网络切换之后，保留源小区的部分或者全部无线资源。
在一个示例性的实施方式中，所述部分或者全部无线资源包括：部分或者全部无线连接，其中，所述无线连接包括以下至少之一：RRC连接、SRB、DRB、PDU会话上下文、NAS层连接。
在一个示例性的实施方式中，所述部分或者全部无线资源包括：部分或者全部无线配置，其中，所述无线配置包括以下至少之一：L1(物理层)配置，MAC层配置，RLC层配置，RRC层配置，PDCP层配置，以及NAS层配置。
在一个示例性的实施方式中，所述保留PDU会话信息用于指示网络切换之后，保留PDU会话。
在一个示例性的实施方式中，所述保留PDU会话信息包括：PDU会话保留 指示信息，或，需保留的PDU会话信息列表；其中，所述PDU会话信息列表包括一个或多个PDU会话的信息。
在一个示例性的实施方式中，保留模块192被配置为继续使用下行带宽部分(BWP)；根据下行控制信息DCI中RIV指示信息接收PDSCH发送的下行数据。
在一个示例性的实施方式中，如果满足
Figure PCTCN2021087363-appb-000008
则
Figure PCTCN2021087363-appb-000009
如果不满足
Figure PCTCN2021087363-appb-000010
则
Figure PCTCN2021087363-appb-000011
其中，L CRBs为连续RB的长度，
Figure PCTCN2021087363-appb-000012
为下行带宽RB数，RB start为所述下行带宽中的起始资源块。
在一个示例性的实施方式中，保留模块192被配置为保留UE的C-RNTI，其中，所述UE的C-RNTI用于接收DCI信息。
在一个示例性的实施方式中，保留模块192被配置为保留物理上行控制信道(PUCCH)的资源分配方式；和/或，保留分配的PUCCH资源集合。
在一个示例性的实施方式中，保留模块192被配置为保留一个或者多个数据无线承载(DRB)；保留一个或者多个信令无线承载(SRB)；将SRB1或者SRB2中的一个修改为SRB3。
在一个示例性的实施方式中，保留模块192被配置为继续使用原有的PDU会话进行数据传输；或，在第一通信节点发起PDU会话后，重建恢复数据连接。
在一个示例性的实施方式中，保留模块192被配置为使用网络切换前的安全上下文。
在一个示例性的实施方式中，保留模块192被配置为保留DCCH。
在一个示例性的实施方式中，保留模块192被配置为：继续根据所述DCCH发送和接收数据。
在一个示例性的实施方式中，保留模块192被配置为保留部分或者全部的QOS流或QOS流信息。
在一个示例性的实施方式中，保留模块192是被配置为：继续使用所述QOS流和/或QOS流信息进行用户面的数据发送和/或接收。
本实施例中提供的网络切换装置可执行本申请任意实施例所提供的网络切换方法，具备执行该方法相应的功能模块。未在本实施例中描述的技术细节，可参见本申请任意实施例所提供的网络切换方法。
上述网络切换装置的实施例中，所包括的各个单元和模块只是按照功能逻 辑进行划分的，但并不局限于上述的划分，只要能够实现相应的功能即可；各功能单元的名称也只是为了便于相互区分，并不用于限制本申请的保护范围。
本申请实施例还提供一种设备，图20是本申请实施例提供的一种设备的结构示意图，如图20所示，该设备包括处理器201、存储器202、输入装置203、输出装置204和通信装置205；设备中处理器201的数量可以是一个或多个，图20中以一个处理器201为例；设备中的处理器201、存储器202、输入装置203和输出装置204可以通过总线或其他方式连接，图20中以通过总线连接为例。
存储器202作为一种计算机可读存储介质，可用于存储软件程序、计算机可执行程序以及模块，如本申请实施例中的网络切换方法对应的程序指令/模块(例如，网络切换装置中的第一发送模块171和第一接收模块172)，又如本申请实施例中的网络切换方法对应的程序指令/模块(例如，网络切换装置中的第二接收模块181和第二发送模块182)，再如本申请实施例中的网络切换方法对应的程序指令/模块(例如，网络切换装置中的第三接收模块191和保留模块192)。处理器201通过运行存储在存储器202中的软件程序、指令以及模块，从而执行设备的各种功能应用以及数据处理，即实现本申请实施例提供的任一方法。
存储器202可主要包括存储程序区和存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需的应用程序；存储数据区可存储根据设备的使用所创建的数据等。存储器202可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件、闪存器件、或其他非易失性固态存储器件。在一些实例中，存储器202可包括相对于处理器201远程设置的存储器，这些远程存储器可以通过网络连接至设备。上述网络的实例包括但不限于互联网、企业内部网、局域网、移动通信网及其组合。
输入装置203可被配置为接收输入的数字或字符信息，以及产生与设备的用户设置以及功能控制有关的键信号输入。输出装置204可包括显示屏等显示设备。
通信装置205可以包括接收器和发送器。通信装置205设置为根据处理器201的控制进行信息收发通信。
在上述设备是第一通信节点的情况下，处理器201通过运行存储在系统存储器202中的程序，从而执行各种功能应用以及数据处理，例如实现本申请实施例所提供的网络切换方法，所述方法应用于第一通信节点，包括：向核心网发送切换需求消息，其中，所述切换需求消息中携带在源侧的UE上下文参考信 息；接收核心网发送的切换控制消息，其中，所述切换控制消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧网络节点不要释放该UE所使用的资源，所述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。
本领域技术人员可以理解，处理器201还可以实现本申请任意实施例所提供的网络切换信息方法的技术方案。该设备的硬件结构以及功能可参见本实施例的内容解释。
在上述设备是第二通信节点的情况下，处理器201通过运行存储在系统存储器202中的程序，从而执行各种功能应用以及数据处理，例如实现本申请实施例所提供的一种网络切换方法，所述方法应用于第二通信节点，包括：接收核心网发送的切换请求消息，其中，所述切换请求消息中携带在源侧的UE上下文参考信息；向所述核心网发送切换请求告知消息，其中，所述切换请求告知消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧网络节点不要释放该UE所使用的资源，所述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。
本领域技术人员可以理解，处理器201还可以实现本申请任意实施例所提供的网络切换方法的技术方案。该设备的硬件结构以及功能可参见本实施例的内容解释。
在上述设备是第三通信节点的情况下，处理器201通过运行存储在系统存储器202中的程序，从而执行各种功能应用以及数据处理，例如实现本申请实施例所提供的一种网络切换方法，包括：接收第三消息，其中，所述第三消息中携带无线资源指示信息；根据无线资源指示信息保留源小区的部分或者全部无线资源。
本领域技术人员可以理解，处理器201还可以实现本申请任意实施例所提供的网络切换方法的技术方案。该设备的硬件结构以及功能可参见本实施例的内容解释。
本申请实施例还提供一种包含计算机可执行指令的存储介质，所述计算机可执行指令在由计算机处理器执行时用于执行一种网络切换方法，所述方法应用于第一通信节点，包括：向核心网发送切换需求消息，其中，所述切换需求消息中携带在源侧的UE上下文参考信息；接收核心网发送的切换控制消息，其中，所述切换控制消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧网络节点不要释放该UE所使用的资源，所 述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。
本申请实施例所提供的一种包含计算机可执行指令的存储介质，其计算机可执行指令用于实现不限于如上所述的网络切换方法的操作，还可以用于实现本申请任意实施例所提供的网络切换方法中的相关操作。
本申请实施例还提供一种包含计算机可执行指令的存储介质，所述计算机可执行指令在由计算机处理器执行时用于执行一种网络切换方法，所述方法应用于第二通信节点，包括：接收核心网发送的切换请求消息，其中，所述切换请求消息中携带在源侧的UE上下文参考信息；向所述核心网发送切换请求告知消息，其中，所述切换请求告知消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧网络节点不要释放该UE所使用的资源，所述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。
本申请实施例所提供的一种包含计算机可执行指令的存储介质，计算机可执行指令用于实现不限于如上所述的网络切换方法的操作，还可以用于执行本申请任意实施例所提供的网络切换方法中的相关操作。
本申请实施例还提供一种包含计算机可执行指令的存储介质，所述计算机可执行指令在由计算机处理器执行时用于执行一种网络切换方法，包括：接收第三消息，其中，所述第三消息中携带无线资源指示信息；根据无线资源指示信息保留源小区的部分或者全部无线资源。
本申请实施例所提供的一种包含计算机可执行指令的存储介质，计算机可执行指令用于实现不限于如上所述的网络切换方法操作，还可以用于实现本申请任意实施例所提供的网络切换方法中的相关操作。
通过以上关于实施方式的描述，所属领域的技术人员可以了解到，本申请可借助软件及通用硬件来实现，当然也可以通过硬件实现。基于这样的理解，本申请的技术方案本质上可以以软件产品的形式体现出来，该计算机软件产品可以存储在计算机可读存储介质中，如计算机的软盘、只读存储器(Read-Only Memory,ROM)、随机存取存储器(Random Access Memory,RAM)、闪存(FLASH)、硬盘或光盘等，包括多个指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述的方法。
以上所述，仅为本申请的示例性实施例而已，并非用于限定本申请的保护范围。
本领域内的技术人员应明白，术语用户终端涵盖任何适合类型的无线用户设备，例如移动电话、便携数据处理装置、便携网络浏览器或车载移动台。
一般来说，本申请的多种实施例可以在硬件或专用电路、软件、逻辑或其 任何组合中实现。例如，一些方面可以被实现在硬件中，而其它方面可以被实现在可以被控制器、微处理器或其它计算装置执行的固件或软件中，尽管本申请不限于此。
本申请的实施例可以通过移动装置的数据处理器执行计算机程序指令来实现，例如在处理器实体中，或者通过硬件，或者通过软件和硬件的组合。计算机程序指令可以是汇编指令、指令集架构(Instruction Set Architecture，ISA)指令、机器指令、机器相关指令、微代码、固件指令、状态设置数据、或者以一种或多种编程语言的任意组合编写的源代码或目标代码。
本申请附图中的任何逻辑流程的框图可以表示程序步骤，或者可以表示相互连接的逻辑电路、模块和功能，或者可以表示程序步骤与逻辑电路、模块和功能的组合。计算机程序可以存储在存储器上。存储器可以具有任何适合于本地技术环境的类型并且可以使用任何适合的数据存储技术实现，例如但不限于只读存储器(ROM)、随机访问存储器(RAM)、光存储器装置和系统(数码多功能光碟(Digital Video Disc，DVD)或光盘(Compact Disc，CD))等。计算机可读介质可以包括非瞬时性存储介质。数据处理器可以是任何适合于本地技术环境的类型，例如但不限于通用计算机、专用计算机、微处理器、数字信号处理器(Digital Signal Processor，DSP)、应用专用集成电路(Application Specific Integrated Circuit，ASIC)、可编程逻辑器件(Field Programmable Gate Array，FPGA)以及基于多核处理器架构的处理器。

Claims (44)

  1. 一种网络切换方法，应用于第一通信节点，包括：
    向核心网发送切换需求消息，其中，所述切换需求消息中携带在源侧的用户设备UE上下文参考信息；
    接收所述核心网发送的切换控制消息，其中，所述切换控制消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧的网络节点不要释放所述UE所使用的资源，所述在源侧的UE上下文保持信息由所述在源侧的UE上下文参考信息确定。
  2. 根据权利要求1所述的方法，在网络切换是从独立第五代移动通信技术SA 5G网络切换到演进通用陆地无线电接入新无线电-双连接EN-DC网络的情况下，所述接收核心网发送的切换控制消息之前，还包括：
    接收第二通信节点发送的辅节点添加请求消息，其中，所述辅节点添加请求消息中携带所述在源侧的UE上下文参考信息；
    向所述第二通信节点发送辅节点添加告知消息，其中，所述辅节点添加告知消息用于告知目标节点所述UE在所述EN-DC网络下建立双连接。
  3. 根据权利要求2所述的方法，其中，所述在源侧的UE上下文参考信息包括：源下一代无线接入网节点Source NG-RAN node和无线接入网用户设备下一代接口应用协议标识RAN UE NGAP ID中的至少一个。
  4. 根据权利要求2所述的方法，其中，所述辅节点添加请求消息中携带的所述在源侧的UE上下文参考信息由所述核心网发送至所述第二通信节点。
  5. 根据权利要求2-4任一项所述的方法，其中，在网络切换是SA 5G网络切换到EN-DC网络的情况下，所述第一通信节点是所述SA 5G网络中的5G基站，所述第二通信节点是所述EN-DC网络中的长期演进演进节点B LTE eNB。
  6. 根据权利要求1所述的方法，在网络切换是从EN-DC网络切换到SA 5G网络的情况下，所述接收所述核心网发送的切换控制消息之后，还包括：
    向第二通信节点发送辅节点添加请求消息，其中，所述辅节点添加请求消息中携带所述在源侧的UE上下文参考信息；
    接收所述第二通信节点发送的辅节点添加告知消息，其中，所述辅节点添加告知消息用于告知所述UE在所述EN-DC网络下建立双连接。
  7. 根据权利要求1所述的方法，在确定保留所述UE所使用的资源的情况下，还包括：
    发送第三消息到第三通信节点，其中，所述第三消息中携带无线资源指示信息。
  8. 根据权利要求6所述的方法，在网络切换是SA 5G网络切换到EN-DC网络的情况下，还包括：
    向核心网设备发送UE释放完成消息；
    向所述第二通信节点发送UE释放消息，其中，所述UE释放消息用于指示所述第二通信节点释放所述第二通信节点与所述第一通信节点之间的信令连接。
  9. 根据权利要求8所述的方法，其中，所述在源侧的UE上下文参考信息包括：辅节点用户设备X2接口应用协议标识SN UE X2AP ID信息单元。
  10. 根据权利要求7-9任一项所述所述的方法，其中，在网络切换是EN-DC网络切换到SA 5G网络的情况下，所述第一通信节点是所述EN-DC网络中的LTE eNB，所述辅节点是所述SA 5G网络中的5G基站。
  11. 一种网络切换方法，应用于第二通信节点，包括：
    接收核心网发送的切换请求消息，其中，所述切换请求消息中携带在源侧的用户设备UE上下文参考信息；
    向所述核心网发送切换请求告知消息，其中，所述切换请求告知消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧的网络节点不要释放所述UE所使用的资源，所述在源侧的UE上下文保持信息由所述在源侧的UE上下文参考信息确定。
  12. 根据权利要求11所述的方法，其中，在网络切换是从独立第五代移动通信技术SA 5G网络切换到演进通用陆地无线电接入新无线电-双连接EN-DC网络的情况下，所述接收核心网发送的切换请求消息之后，还包括：
    向第一通信节点发送辅节点添加请求消息，其中，所述辅节点添加请求消息中携带所述在源侧的UE上下文参考信息；
    接收所述第一通信节点发送的辅节点添加告知消息，其中，所述辅节点添加告知消息用于告知目标节点所述UE在所述EN-DC网络下建立双连接。
  13. 根据权利要求12所述的方法，在网络切换是EN-DC网络切换到SA 5G网络的情况下，还包括：
    接收所述第一通信节点发送的辅节点添加请求消息，其中，所述辅节点添加请求消息中携带所述在源侧的UE上下文参考信息；
    向所述第一通信节点发送辅节点添加告知消息，其中，所述辅节点添加告知消息用于告知所述UE在所述EN-DC网络下建立双连接。
  14. 根据权利要求11所述的方法，在网络切换是SA 5G网络切换到EN-DC 网络的情况下，还包括：
    接收第一通信节点发送的UE释放消息，其中，所述UE释放消息用于指示所述第二通信节点释放所述第二通信节点与第一通信节点之间的信令连接。
  15. 一种网络切换方法，应用于第三通信节点，包括：
    接收第三消息，其中，所述第三消息中携带无线资源指示信息；
    根据所述无线资源指示信息保留源小区的部分无线资源或者全部无线资源。
  16. 根据权利要求15所述的方法，其中，所述第三消息为第一通信节点发送。
  17. 根据权利要求15所述的方法，其中，所述第三消息是无线资源控制RRC重配消息，或，所述第三消息是无线控制消息。
  18. 根据权利要求15所述的方法，其中，所述无线资源指示信息包括：源小区保留指示信息，或辅小区信息，或保留协议数据单元PDU会话信息，或者非接入层NAS资源保留指示，或者挂起指示，或服务质量QoS流保留信息。
  19. 根据权利要求15所述的方法，其中，所述源小区保留指示信息用于指示网络切换之后，保留源小区的部分无线资源或者全部无线资源。
  20. 根据权利要求18所述的方法，其中，所述辅小区信息用于指示基于所述辅小区信息与源小区信息的关系，网络切换之后，保留源小区的部分无线资源或者全部无线资源。
  21. 根据权利要求20所述的方法，其中，所述辅小区信息为单个辅小区的信息或者辅小区的列表。
  22. 根据权利要求18所述的方法，其中，所述NAS资源保留指示用于指示网络切换之后，保留源小区的部分NAS资源或者全部NAS资源，其中，所述部分NAS资源或者全部NAS资源包括如下至少一个：UE的注册状态，跟踪区更新TAU信息，以及完整性和加密信息。
  23. 根据权利要求18所述的方法，其中，所述挂起指示用于指示网络切换之后，保留源小区的部分无线资源或者全部无线资源。
  24. 根据权利要求15所述的方法，其中，所述部分无线资源或者全部无线资源包括：部分无线连接或者全部无线连接，其中，所述无线连接包括以下至少之一：RRC连接、信令无线承载SRB、数据无线承载DRB、PDU会话上下文、NAS层连接。
  25. 根据权利要求15所述的方法，其中，所述部分无线资源或者全部无线资源包括：部分无线配置或者全部无线配置，其中，所述无线配置包括以下至少 之一：物理层配置，介质访问控制MAC层配置，无线链路控制RLC层配置，RRC层配置，分组数据汇聚协议PDCP层配置，以及NAS层配置。
  26. 根据权利要求18所述的方法，其中，所述保留PDU会话信息用于指示网络切换之后，保留PDU会话。
  27. 根据权利要求26所述的方法，其中，所述保留PDU会话信息包括：PDU会话保留指示信息，或，需保留的PDU会话的信息列表；其中，所述PDU会话的信息列表包括至少一个PDU会话的信息。
  28. 根据权利要求18所述的方法，其中，所述QoS流保留信息用于指示网络切换之后，保留QoS流或QoS流信息。
  29. 根据权利要求15中所述的方法，其中，所述保留部分无线资源或者全部无线资源包括：
    继续使用下行带宽部分BWP；
    根据下行控制信息DCI中资源指示值RIV指示信息接收物理下行共享信道PDSCH发送的下行数据。
  30. 根据权利要求29所述的方法，其中，
    在满足
    Figure PCTCN2021087363-appb-100001
    的情况下，
    Figure PCTCN2021087363-appb-100002
    在不满足
    Figure PCTCN2021087363-appb-100003
    的情况下，
    Figure PCTCN2021087363-appb-100004
    其中，L CRBs为连续资源块RB的长度，
    Figure PCTCN2021087363-appb-100005
    为下行带宽的RB数，RB start为所述下行带宽中的起始资源块。
  31. 根据权利要求15中所述的方法，其中，所述保留部分无线资源或者全部的无线资源包括：
    保留UE的小区无线网络临时标识C-RNTI，其中，所述UE的C-RNTI用于接收DCI信息。
  32. 根据权利要求15中所述的方法，其中，所述保留部分或者全部无线资源包括如下至少之一：
    保留物理上行控制信道PUCCH的资源分配方式；
    保留分配的PUCCH资源集合。
  33. 根据权利要求15中所述的方法，其中，所述保留部分或者全部无线资源包括：
    保留至少一个DRB；
    保留至少一个SRB；
    将SRB1或者SRB2中的一个修改为SRB3。
  34. 根据权利要求15中任一项所述的方法，其中，所述保留部分无线资源或者全部的无线资源包括：
    继续使用原有的PDU会话进行数据传输；
    或，在第一通信节点发起PDU会话后，重建并恢复数据连接。
  35. 根据权利要求15中所述的方法，其中，所述保留部分无线资源或者全部无线资源包括：
    使用网络切换前的安全上下文。
  36. 根据权利要求15中所述的方法，其中，所述保留部分无线资源或者全部的无线资源包括：保留专用控制信道DCCH。
  37. 根据权利要求36中所述的方法，其中，所述保留DCCH包括：
    继续根据所述DCCH发送数据和接收数据。
  38. 根据权利要求15中所述的方法，其中，所述保留部分无线资源或者全部无线资源包括：保留部分QOS流或QOS流信息，或者保留全部QOS流或QOS流信息。
  39. 根据权利要求38中所述的方法，其中，所述保留QOS流或者QOS流信息包括：
    继续使用所述QOS流或QOS流信息进行用户面的数据发送和/或接收。
  40. 一种网络切换装置，配置于第一通信节点，包括：
    第一发送模块，被配置为向核心网发送切换需求消息，其中，所述切换需求消息中携带在源侧的用户设备UE上下文参考信息；
    第一接收模块，被配置为接收所述核心网发送的切换控制消息，其中，所述切换控制消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源侧的网络节点不要释放所述UE所使用的资源，所述在源侧的UE上下文保持信息由在源侧的UE上下文参考信息确定。
  41. 一种网络切换装置，配置于第二通信节点，包括：
    第二接收模块，被配置为接收核心网发送的切换请求消息，其中，所述切换请求消息中携带在源侧的用户设备UE上下文参考信息；
    第二发送模块，被配置为向所述核心网发送切换请求告知消息，其中，所 述切换请求告知消息中携带在源侧的UE上下文保持信息，其中，所述在源侧的UE上下文保持信息用于指示源测的网络节点不要释放所述UE所使用的资源，所述在源侧的UE上下文保持信息由所述在源侧的UE上下文参考信息确定。
  42. 一种网络切换装置，配置于第三通信节点，包括：
    第三接收模块，被配置为接收第三消息，其中，所述第三消息中携带无线资源指示信息；
    保留模块，被配置为根据所述无线资源指示信息保留源小区的部分无线资源或者全部无线资源。
  43. 一种设备，包括：
    至少一个处理器；
    存储器，被配置为存储至少一个程序；
    当所述至少一个程序被所述至少一个处理器执行时，使得所述至少一个处理器实现如权利要求1-39任一项所述的方法。
  44. 一种存储介质，存储有计算机程序，所述计算机程序被处理器执行时实现权利要求1-39任一项所述的方法。
PCT/CN2021/087363 2020-04-26 2021-04-15 网络切换方法、装置、设备及存储介质 WO2021218644A1 (zh)

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KR1020227040345A KR20230005238A (ko) 2020-04-26 2021-04-15 네트워크 핸드오버 방법, 장치, 설비 및 저장매체
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