WO2019024677A1 - 网络切换的方法、装置及*** - Google Patents

网络切换的方法、装置及*** Download PDF

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Publication number
WO2019024677A1
WO2019024677A1 PCT/CN2018/095842 CN2018095842W WO2019024677A1 WO 2019024677 A1 WO2019024677 A1 WO 2019024677A1 CN 2018095842 W CN2018095842 W CN 2018095842W WO 2019024677 A1 WO2019024677 A1 WO 2019024677A1
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Prior art keywords
access network
base station
handover
request
network
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PCT/CN2018/095842
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English (en)
French (fr)
Inventor
李振东
朱进国
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to JP2020505249A priority Critical patent/JP7025528B2/ja
Priority to EP18840902.3A priority patent/EP3595360B1/en
Priority to KR1020207005521A priority patent/KR102311457B1/ko
Priority to ES18840902T priority patent/ES2880099T3/es
Publication of WO2019024677A1 publication Critical patent/WO2019024677A1/zh
Priority to US16/568,230 priority patent/US11432208B2/en

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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
    • 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
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • 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
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • 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
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H04W36/00226—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
    • 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
    • H04W36/0044—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information of quality context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H04W36/385—Reselection control by fixed network equipment of the core network

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, apparatus, and system for network switching.
  • FIG. 1 is a diagram of an EPC architecture in the related art of the present invention.
  • the functions of the network elements in the architecture are as follows:
  • the terminal accesses the 4G network through the wireless air interface and obtains the service.
  • the terminal exchanges information through the air interface and the base station, and passes through the non-access stratum (NAS) and the mobility management entity of the core network. Interactive information.
  • NAS non-access stratum
  • the base station (RAN, Radio Access Network, eNB) is responsible for air interface resource scheduling and air interface connection management of the terminal accessing the network.
  • Mobile management entity the core network control plane entity, which is mainly responsible for user authentication, authorization, and subscription checking, user mobility management, PDN (Packet Data Network) connection, and bearer maintenance. Triggering is triggered in the user IDLE state. Call and other functions.
  • Service Gateway Serving GW (Gateway): The core network user plane function entity, which is mainly responsible for the interaction with the PDN GW in the case of roaming.
  • the packet data gateway PDN GW (referred to as P-GW): the core network user plane function entity, is the access point of the terminal accessing the PDN network, and is responsible for allocating the user IP (Internet Protocol) address, and the network triggered bearer establishment and modification. And delete, also has QoS (Quality of Service) control charging and other functions, is the anchor point of the user in the 3GPP system, thereby ensuring the IP address unchanged and ensuring business continuity.
  • the P-GW is further divided into two parts, one is the control entity PGW-C, and the other is the user plane entity PGW-U.
  • PGW-C is responsible for signaling control
  • PGW-U is responsible for IP forwarding.
  • HSS Home Subscription Server
  • PCRF Policy and charging control function
  • the PCRF provides network control rules based on service data flows, including traffic data flow detection, Gating Control, Quality of Service (QoS) control, and data flow based charging rules.
  • QoS Quality of Service
  • the PCRF sends its formulated policies and charging rules to the P-GW for execution.
  • Next-generation communication system can support eMBB (Evolved Mobile Broadband), mMTC (Massive Machine Type Communication), uMTC (Ultra Reliable Machine). Type Communication, ultra-reliable machine communication) three types of services, these three types of services have different network characteristics.
  • eMBB Evolved Mobile Broadband
  • mMTC Massive Machine Type Communication
  • uMTC Ultra Reliable Machine
  • Type Communication, ultra-reliable machine communication three types of services, these three types of services have different network characteristics.
  • 2 is a schematic diagram of a next-generation mobile communication network architecture in the related art of the present invention, wherein the functions of each network element are as follows:
  • the terminal accesses the network through the next-generation wireless air interface and obtains the service.
  • the terminal exchanges information through the air interface and the base station, and interacts with the common control plane function of the core network and the session control plane through the non-access layer signaling. information.
  • the next-generation base station (NG RAN, Radio Access Network (RAN)) is responsible for air interface resource scheduling and air interface connection management of the terminal access network.
  • the next generation base station may be a new radio access technology (gNB) or an enhanced LTE technology (eLTE).
  • Session Management Function interacts with the terminal, and is mainly responsible for processing user PDU (Packet Data Unit) session establishment, modification, and deletion requests, and selecting UPF (User Plane function); Establish a user plane connection between the UE and the UPF; together with the PCF (Policy Control Function), determine the QoS (Quality of Service) parameters of the session.
  • PDU Packet Data Unit
  • UPF User Plane function
  • PCF Policy Control Function
  • Access and Mobility Control Function It is a common control plane function in the core network.
  • AMF Access and Mobility Control Function
  • AMF Access and Mobility Control Function
  • AMF Access and Mobility Control Function
  • UPF User Plane Function
  • UPF Provides user plane processing functions, including data forwarding and QoS execution.
  • UPF also provides user plane anchors when users move to ensure business continuity.
  • PCF Policy Control Function
  • Unified Data Management Stores user subscription data, which is very similar to HSS in the 4G era.
  • NextGen System NextGen System
  • 5GS NextGen System
  • FIG. 3 is a network architecture for satisfying 4G and 5G bidirectional handover in the related art of the present invention.
  • Its core feature is that the architecture is compatible with both 4G and 5G architectures.
  • Its core feature is the combination of PGW-C and SMF, PGW-U and UPF are combined, PCF and PCRF are combined, and the user plane of UE is always anchored on UPF/PGW-U.
  • an Nx interface is added, and an inter-system handover request is sent on the interface. In this way, when the UE switches between LTE and 5G, seamless handover can be guaranteed.
  • the UE and the network establish a PDN connection, which includes one default bearer and multiple dedicated bearers. Each bearer's information contains corresponding service flows and their QoS parameters.
  • the UE and the network establish a PDU session, which contains a default QOS flow and multiple dedicated quality of service flows. Each QoS flow includes corresponding service flows, and its QoS parameters, such as QoS profile and packet filter.
  • the PDU session established by the 5G system is switched to the 4G system and converted to the PDN connection.
  • the quality of service stream in the PDU session is converted to a bearer after switching to the 4G system. vice versa.
  • Step 100 The terminal UE has established a PDU session in the 5G system, and may establish a dedicated service quality flow (dedicated Qos flow);
  • Step 101 The source 5G RAN node finds that it needs to switch to 4G, and sends a handover request to the AMF, where the target cell information is carried;
  • Step 102 The AMF requests the SMF to correspond to the session information of the 4G.
  • Step 103 The AMF selects the target MME and sends a Forward Relocation Request.
  • Step 104 The MME sends a Create session request to the S-GW.
  • Step 105 The MME sends a handover request to the eNB to request a radio resource.
  • Step 106 After receiving the eNB response, the MME sends a Forward Relocation Response to the AMF.
  • Step 107 the AMF sends a Handover command to the 5G RAN node, and the 5G RAN node sends a Handover command to the UE.
  • Step 108 the UE accesses the 4G system, and sends a Handover complete to the eNB;
  • Step 109 the eNB sends handover notify to the MME
  • the MME initiates a modify bearer request to the S-GW, and the S-GW sends the S-GW to the P-GW to complete the establishment of the media plane.
  • step 115 the UE performs a TAU process (Tracking Area Update) in the 4G system.
  • TAU process Tracking Area Update
  • FIG. 5 is a flowchart of switching from 4G to 5G in the related art of the present invention, including:
  • Step 200 The terminal UE has established a PDN connection in the 4G system, and may also establish a dedicated bearer;
  • Step 201 The source 4G RAN node (eNB) finds that it needs to switch to 5G, and sends a handover request to the MME, where the target cell information is carried;
  • Step 202 The MME selects a target AMF according to the handover request, and sends a Forward Relocation Request to the AMF.
  • Step 203 The AMF requests 5G session information from the SMF.
  • Step 204 The AMF sends a handover request to the 5G RAN to reserve resources.
  • Step 205 The AMF updates the session according to the information of the 5G RAN.
  • Step 206 The AMF returns a Forward Relocation Response to the MME.
  • Step 207 The MME sends a handover command to the eNB, and the eNB sends a handover command to the UE, where the wireless information of the target 5G RAN is included.
  • Step 208 the UE accesses the target 5G RAN node, and sends a Handover Complete.
  • Step 209 the 5G RAN node sends Handover Notify to the AMF;
  • Steps 210-212 the AMF notifies the SMF that the handover is completed, and the SMF modifies the media plane;
  • Step 213 The UE initiates a registration process on the 5G system.
  • the cross-access switchover occurs. In this case, it can be regarded as a handover within the 5G system, and will not be described again.
  • some services are not suitable for provisioning on 5G base stations, such as IMS voice.
  • IMS voice If the UE is connected to the gNB, it needs to roll back to the 4G system to provide voice service (VoLTE), or roll back to the eLTE base station to provide voice service.
  • VoIP voice service
  • FIG. 6 is a schematic diagram of the implementation of the CSFB in the related art 3GPP system according to the present invention.
  • the Circuit Switched Fallback (CSFB) in the related art includes:
  • Step 301 The UE receives a SIP (Session Initiation Protocol) Invite request; (for the calling party, ignore this step)
  • SIP Session Initiation Protocol
  • Step 302 The UE sends an extended Service Request (SR, Service Request) to the NG RAN node. (For the calling party, when the UE initiates the call, the step is triggered)
  • SR Service Request
  • Step 303 the NG RAN node forwards the extended Service Request to the AMF.
  • Step 304 switching to 4G by PS handover
  • Step 305 For the called scenario, the UE sends a SIP 183 response to the IMS in 4G.
  • Step 305a For the calling scenario, the UE initiates a SIP Invite request in the 4G system.
  • step 306 the UE and the remote end complete the establishment of the IMS session.
  • the network and the UE there is a great need for the network and the UE, and both the UE and the network need to know that the other party has such capability.
  • the UE needs to know that although the base station does not support a certain service, the network can switch to the base station/network supporting the service when the service is initiated.
  • the network needs to know that the user can trigger the extended Service Request when the service is performed, so that the user can switch to the target network/base station.
  • the UE receives the application layer message, it needs to trigger the underlying signaling. This cross-layer trigger is very difficult for the third-party application.
  • the embodiments of the present invention provide a method, an apparatus, and a system for network handover, so as to at least solve the technical problem that the networks in the related art are too complicated to switch between networks.
  • a method for network handover including: in a process of establishing a service of a user equipment UE, a first network element instructing a source base station that connects the UE to initiate a handover; After the access network switches to the second access network, the second network element initiates bearer establishment, or the quality of service QoS flow is established.
  • a network switching system including: a first network element, a second network element, where the first network element includes: a determining module, configured to be in a user equipment UE service In the process of establishing, determining that the service is established in the second access network, the indication module is configured to: in the process of establishing the service of the user equipment, the source base station that connects the UE initiates the handover; the second network element includes: And a module, configured to initiate bearer setup or quality of service QoS flow establishment after the UE switches from the first access network to the second access network.
  • a device for network switching is further provided, which is applied to the SMF, and includes: a receiving module, configured to receive at least one of the following service requests of the user equipment in the first access network: a new Qos a rule, a session modification request, a determining module, configured to determine that the service is established in a second access network, and a sending module configured to send, by using an AMF, a handover to the second access network of the base station of the first access network Request.
  • another apparatus for network switching is further provided, which is applied to the gNB, and includes: a first receiving module, configured to receive an N2 session request sent by the SMF, where the N2 session request carries the The first sending module is configured to send an N2 session response to the SMF through the AMF, and the second sending module is configured to send a handover request handover required to the AMF, where the switching The request carries the target cell information.
  • another apparatus for network switching is further provided, which is applied to the gNB, and includes: a receiving module, configured to receive a first handover request for switching from the first access network to the second access network. a sending module, configured to send, according to the handover request, a second handover request to switch the first access network to the second access network to the AMF, where the gNB is applied to the first access The internet.
  • a storage medium is also provided.
  • the storage medium is configured to store program code for performing the following steps: in the process of user equipment UE service establishment, indicating that the source base station connecting the UE initiates handover; and switching from the first access network to the second in the UE After accessing the network, initiate bearer setup, or establish a quality of service QoS flow.
  • a processor for running a program wherein the program is executed to perform the steps in any of the above method embodiments.
  • an electronic device comprising a memory and a processor, wherein the memory stores a computer program, the processor being arranged to run the computer program to perform any of the above The steps in the method embodiments.
  • the first network element indicates that the source base station that connects the UE initiates the handover; after the UE switches from the first access network to the second access network, the second network element Initiate bearer establishment, or service quality Qos flow establishment.
  • FIG. 1 is a diagram showing an EPC architecture in the related art of the present invention.
  • FIG. 2 is a schematic diagram of a next-generation mobile communication network architecture in the related art of the present invention.
  • 3 is a network architecture for satisfying 4G and 5G bidirectional handover in the related art of the present invention
  • FIG. 5 is a flowchart of switching from 4G to 5G in the related art of the present invention.
  • FIG. 6 is a schematic diagram of an implementation manner of CSFB in a related art 3GPP system according to the present invention.
  • FIG. 7 is a flowchart of a method of network handover according to an embodiment of the present invention.
  • FIG. 8 is a structural block diagram of a system for network switching according to an embodiment of the present invention.
  • Figure 9 is a flow chart of the SMF triggering 5G to 4G fallback in the present invention.
  • FIG. 10 is a flow chart of AMF triggering 5G to 4G switching in the present invention.
  • FIG. 11 is a flowchart of triggering 5G to 4G handover of an NG RAN node in this embodiment
  • FIG. 13 is a flow chart of the service falling from the NR to the eLTE in the 5G system in the present invention.
  • FIG. 14 is a flowchart of upgrading a service from 4G to 5G in this embodiment.
  • the embodiment of the present application can be run on the network architecture shown in FIG. 3.
  • FIG. 7 is a flowchart of a method for network switching according to an embodiment of the present invention. As shown in FIG. 7, the process includes the following steps:
  • Step S702 in the process of establishing the service of the user equipment UE, the first network element instructs the source base station that connects the UE to initiate the handover;
  • Step S704 after the UE switches from the first access network to the second access network, the second network element initiates bearer establishment, or the quality of service QoS flow is established.
  • the first network element indicates that the source base station that connects the UE initiates the handover; after the UE switches from the first access network to the second access network, the second network element initiates the bearer.
  • the first network element of the execution unit of the foregoing step includes at least one of the following: a session management function SMF, an access and mobility control function AMF, a mobility management function MME, a base station of the first access network, etc.
  • the second network element node is the SMF
  • the first network element is one of the following: SMF, AMF, the base station of the first access network
  • the second network element node is the PGW-C or the SMF. But it is not limited to this.
  • the first network element instructing the source base station that connects the UE to initiate the handover includes at least one of the following:
  • the first network element Upon receiving the establishment request, the first network element indicates that the source base station that connects the UE initiates the handover; the establishment request is the request name received by the base station, and the first network element is the base station;
  • the first network element Upon receiving the new QoS rule, the first network element instructs the source base station connected to the UE to initiate a network handover;
  • the first network element Upon receiving the resource establishment request, the first network element instructs the source base station that connects to the UE to initiate the handover;
  • the first network element Upon receiving the session modification request, the first network element indicates that the source base station that connects the UE initiates a network handover; the session modification request is a request name received by the SMF/PGW-C, and the first network element is the SMF. .
  • the base station of the first access network includes at least one of the following: a gNB (5G base station), an enhanced long term evolution eLTE base station, and an LTE base station.
  • a gNB 5G base station
  • an enhanced long term evolution eLTE base station 5G base station
  • an LTE base station 5G base station
  • the solution in this embodiment can be triggered on different network element entities.
  • the following description is divided into different scenarios:
  • the first network element When the first network element is an SMF, the first network element indicates that the source base station that connects the UE initiates the handover, including:
  • the SMF determines that the service is established in the second access network.
  • the SMF sends a request for switching to the second access network by using the AMF to the base station of the first access network.
  • the first network element When the first network element is the AMF, the first network element indicates that the source base station that connects the UE initiates the handover, including:
  • the AMF receives a session request sent by the SMF, where the session request carries the QoS information of the first access network.
  • the AMF sends an N2 session request to the first access network, where the N2 session request carries an indication of switching to the second access network.
  • the AMF receives a handover request handover request sent by the first access network, where the handover Required carries the target cell information.
  • the AMF sends an N2 session response to the SMF.
  • the first network element When the first network element is the base station of the first access network that connects to the UE, the first network element indicates that the source base station that connects the UE initiates the handover, including:
  • the base station of the first access network receives the N2 session request sent by the SMF, where the N2 session request carries the Qos information of the first access network.
  • the base station of the first access network sends an N2 session response to the SMF through the AMF.
  • the base station of the first access network sends a handover request handover request to the AMF, where the handover request carries the target cell information.
  • the first network element When the first network element is the base station of the first access network that connects to the UE, the first network element indicates that the source base station that connects the UE initiates the handover, including:
  • the base station of the first access network receives the N2 session request sent by the SMF, where the N2 session request carries the QoS information of the first access network.
  • the base station of the first access network sends a handover request handover request to the AMF, and the AMF sends an N2 session response to the SMF, where the handover request carries the target cell information.
  • the first network element When the first network element is the MME, the first network element indicates that the source base station that connects the UE initiates the handover, including:
  • the MME receives a setup bearer request Create Bearer Request sent by the PGW-C through the S-GW;
  • the MME determines that the service corresponding to the establishment of the bearer request needs to be established in the second access network.
  • the MME sends a request for handover to the second access network to the base station of the first access network.
  • the N2 session response in the foregoing scenario carries information used to indicate that the UE switches to the second access network.
  • the first access network is a new wireless NR access network
  • the second access network is a long term evolution LTE access network
  • the first access network is an LTE access network
  • the second access network is For the NR access network.
  • SMF-C and PGW-C are combined network elements and may have internal interactions with each other:
  • the first network element is an SMF
  • the second network element PGW-C when the UE switches to the second network, how does the second network element PGW-C know to establish a bearer in the second network, because the SMF and the PGW-C are the combined network element SMF? -C internally notifies PGW-C, so after the handover is completed, PGW-C will initiate bearer setup;
  • the first network element is an AMF, or a gNB
  • the SMF and the second network element PGW-C are internally notified to the PGW-C by the set network element SMF, so after the handover is completed, the PGW-C initiates the bearer establishment;
  • the SMF knows that the handover occurs because a handover occurs in the source network bearer or the quality of service flow establishment.
  • the SMF and the second network element PGW-C are internally notified to the PGW-C by the set network element SMF, so after the handover is completed, the PGW-C initiates the bearer establishment;
  • the MME When the MME is the first network element, it should notify the PGW-C in step (the MME wants the PGW-C to send a Create Bearer response through the S-GW, indicating that the QoS is indicated in the target test), and the UE switches to the second.
  • the internet The PGW-C and the second network element SMF are the internal network element PGW-C that internally informs the SMF, so after the handover is completed, the SMF initiates the Qos flow establishment.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.
  • a network switching system is also provided in this embodiment, and the device is used to implement the foregoing embodiments and preferred embodiments, and details are not described herein.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the devices described in the following embodiments are preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 8 is a structural block diagram of a system for network switching according to an embodiment of the present invention. As shown in FIG. 8, the device includes: a first network element 80, and a second network element 82, where
  • the first network element 80 includes:
  • the determining module 800 is configured to determine that the service is established in the second access network during the establishment of the user equipment UE service;
  • the indicating module 802 is configured to indicate that the source base station that connects the UE initiates the handover during the establishment of the user equipment UE service;
  • the second network element 82 includes: an initiating module 820, configured to initiate bearer setup or quality of service QoS flow establishment after the UE switches from the first access network to the second access network.
  • the indication module 802 includes at least one of the following: the first indication unit is configured to: when receiving the bearer setup request, instruct the source base station that connects the UE to initiate the handover; and the second indication unit is configured to receive the new Qos The rule indicates that the source base station that connects the UE initiates the handover; the third indication unit is configured to: when receiving the resource setup request, instruct the source base station that connects the UE to initiate the handover; and the fourth indication unit is configured to receive the session modification request And indicating that the source base station that connects the UE initiates the handover.
  • the first network element 80 includes at least one of the following: a session management function SMF, an access and mobility control function AMF, a mobility management function MME, and a base station of the first access network.
  • the base station of the first access network includes at least one of the following: a gNB, an enhanced long term evolution eLTE, and an LTE base station.
  • the second network element 82 includes: a core network element of the second access network.
  • the indication module 802 is configured to: send, by using the AMF, a request for switching to the second access network to the base station of the first access network.
  • the indication module 802 is configured to: receive a session request sent by the SMF, where the session request carries the QoS information of the first access network; and sends an N2 session request to the first access network, where The N2 session request carries an indication of handover to the second access network; receiving a handover request handover Required sent by the first access network, where the handover Required carries the target cell information; and sends an N2 session response to the SMF.
  • the indication module 802 is configured to: receive an N2 session request sent by the SMF, where the N2 session request carries the QoS information of the first access network; Sending an N2 session response to the SMF; sending a handover request handover Required to the AMF, where the handover request carries the target cell information.
  • the indication module 802 is configured to: receive an N2 session request sent by the SMF, where the N2 session request carries the Qos information of the first access network; to the AMF Sending a handover request handover Required, the AMF sends an N2 session response to the SMF, where the handover request carries the target cell information.
  • the determining module 800 is configured to: receive a setup bearer request sent by the PGW-C through the S-GW, and determine that the service corresponding to the establishment of the bearer request needs to be established in the second access network;
  • the module 802 is configured to: send a request to switch to the second access network to the base station of the first access network.
  • the first access network in this embodiment is a new wireless NR access network
  • the second access network is a long term evolution LTE access network
  • the first access network is an LTE access network
  • the second access The incoming network is the NR access network.
  • the second network element 82 is the SMF; or, when the first network element 80 is one of the following: SMF, AMF, the base station of the first access network, and the second The network element 82 node is a PGW-C or an SMF.
  • the N2 session response carries information used to indicate that the UE switches to the second access network.
  • the embodiment further provides a network switching device, which is applied to the SMF, and includes: a receiving module, configured to receive at least one of the following service requests of the user equipment in the first access network: a new Qos rule, a session modification request; a determining module, connected to the receiving module, configured to determine that the service is established in the second access network; the sending module is connected to the determining module, and configured to send, by using the AMF, a request for switching to the second access network by the base station of the first access network .
  • a network switching device which is applied to the SMF, and includes: a receiving module, configured to receive at least one of the following service requests of the user equipment in the first access network: a new Qos rule, a session modification request; a determining module, connected to the receiving module, configured to determine that the service is established in the second access network; the sending module is connected to the determining module, and configured to send, by using the AMF, a request for switching to the second access network by the base station of the first access
  • the embodiment also provides another device for network switching, which is applied to the gNB, and includes: a first receiving module, configured to receive an N2 session request sent by the SMF, where the N2 session request carries the QoS information of the first access network;
  • the first sending module is configured to send an N2 session response to the SMF through the AMF, and the second sending module is configured to send a handover request handover required to the AMF, where the handover request carries the target cell information.
  • the radio bearer request has the same function as the N2 session request, and receives an N2 session request, which carries the Qos information, that is, the base station needs to establish a radio bearer.
  • the N2 session response carries information used to indicate that the UE switches to the second access network.
  • the embodiment further provides another device for network switching, which is applied to the gNB, and includes: a receiving module, configured to receive a first handover request for switching from the first access network to the second access network; and a sending module, configured to Transmitting, to the AMF, a second handover request to switch the first access network to the second access network according to the handover request; wherein the gNB is applied to the first access network.
  • a receiving module configured to receive a first handover request for switching from the first access network to the second access network
  • a sending module configured to Transmitting, to the AMF, a second handover request to switch the first access network to the second access network according to the handover request; wherein the gNB is applied to the first access network.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination.
  • the forms are located in different processors.
  • This embodiment is an optional embodiment according to the present invention, which is described in detail in conjunction with a specific embodiment:
  • This embodiment proposes a method and system for service fallback.
  • the network node instructs the base station to initiate a handover when receiving a media plane setup request, or a new QoS rule, or a resource setup request.
  • the network node After switching to the second access network, or the second base station, the network node initiates the establishment of a new quality of service flow, or bearer.
  • the SMF triggers the 5G to 4G fallback flowchart, and the SMF triggers the 5G to 4G fallback implementation manner, including:
  • Step 401 The terminal UE accesses in the 5G system to establish a PDU session. And completed the IMS registration;
  • Step 402 IMS session establishment process
  • Step 403 The P-CSCF initiates a session resource authorization request to the PCF/PCRF.
  • Step 404 The PCF initiates a PDU-CAN session modification request to the SMF, where the QoS rule is included, and optionally, the Qos rule information used by the 4G system may also be included.
  • Step 405 The SMF determines that the service needs to be established in the 4G network, and the SMF sends a request to switch to the 4G. The request is sent to the 5G RAN node through the AMF.
  • Step 406 The NG RAN sends a handover Required request to the AMF, where the target cell information is carried;
  • Step 407 The UE switches to 4G, and the process is the same as steps 102-114 of FIG. 4;
  • Step 408 After the handover is completed, the UE initiates a TAU process in the 4G system.
  • the PGW-C can also locally generate the Qos rule of the 4G system according to the 5G Qos rule, or use the Qos rule of the 4G system provided in step 404, or take the following steps 409, 410:
  • Step 409 The PGW-C initiates an IP-CAN session modification request to the PCRF.
  • Step 410 The PCRF returns a Qos rule of the 4G system to the PGW-C.
  • Step 411 The PGW-C sends a Create session request to the S-GW, and the S-GW forwards the request to the MME, where the 4G Qos rule is carried.
  • Step 412 The MME sends a bearer setup request to the eNB.
  • Step 413 The eNB sends an RRC reconfiguration request to the UE.
  • Step 414 The UE returns an RRC reconfiguration response.
  • Step 415 The eNB returns a bearer setup request response to the MME.
  • Step 416 The MME returns a Create session request response to the S-GW, and the S-GW forwards the response to the PGW-C.
  • Step 417 The PGW-C returns a QoS rule installation response to the PCRF.
  • Step 418 The PCRF returns a request resource response to the P-CSCF.
  • Step 419 The IMS system completes session establishment.
  • FIG. 10 is a flow chart of AMF triggering 5G to 4G switching in the present invention, and AMF triggering 5G to 4G switching;
  • Steps 501 to 504 are the same as steps 401 to 404;
  • Step 505 The SMF sends a session request to the 5G RAN node, carrying the required 5G Qos information, and the message first arrives at the AMF;
  • Step 506 The AMF sends an N2 session request to the 5G RAN node, where the indication of switching to 4G is carried;
  • Step 507 The NG RAN sends a handover Required request to the AMF, where the target cell information is carried;
  • Step 508 The AMF sends an N2 session response to the SMF, indicating that the switch is to 4G, and then the bearer is established.
  • Step 509 In the same step 407, the UE switches to 4G; where the UE may trigger the TAU process (same step 408);
  • Step 510 After the handover is completed, the PGW-C establishes a dedicated bearer at 4G, as in steps 409-418; then the IMS (IP Multimedia Subsystem) system completes the session establishment.
  • IMS IP Multimedia Subsystem
  • FIG. 11 is a flowchart of a NG RAN node triggering a 5G to 4G handover in the embodiment, and an NG RAN node triggering a 5G to 4G handover;
  • Steps 601 to 604 are the same as steps 401 to 404;
  • Step 605 The SMF sends an N2 session request to the 5G RAN node, where the 5G Qos parameter is carried, and the request is sent to the 5G RAN node through the AMF.
  • Step 606 The NG RAN sends an N2 session response to the SMF, indicating that the handover is to 4G, and the response arrives at the SMF through the AMF.
  • Step 607 The NG RAN sends a handover Required request to the AMF, where the target cell information is carried;
  • steps 606-607 can also be replaced by the following steps 606a-607a:
  • Step 606a The NG RAN sends a handover Required request to the AMF, where the target cell information is carried, and the N2 session can be carried to the 4G indication.
  • Step 607a The AMF sends an N2 session response to the SMF, indicating that the switch is to 4G.
  • Step 608 In the same step 407, the UE switches to 4G; where the UE may trigger the TAU process (same step 408);
  • Step 609 After the handover is completed, the PGW-C establishes a dedicated bearer at 4G, which is the same as steps 409-418; then the IMS system completes the session establishment.
  • FIG. 12 is a flow chart of the service falling back from the NR to the eLTE in the embodiment, and the implementation of the service falling back from the NR to the eLTE in the 5G system.
  • both the 5G RAN node and the eLTE base station access the 5G core network through the AMF. But the basic point of the invention is the same.
  • the Qos stream is established, it is switched from the 5G RAN to the eLTE base station.
  • Steps 701-702 are the same as steps 401-402; in step 702, the UE currently accessing the base station is a 5G RAN node;
  • Step 703 The P-CSCF initiates a session resource authorization request to the PCF.
  • Step 704 The PCF initiates a PDU-CAN session modification request to the SMF, where the QoS rule is included.
  • Step 705 The SMF determines that the service needs to be established on the eLTE base station, and the SMF sends a request for handover to the eLTE base station, and the request is sent to the 5G RAN node through the AMF.
  • Step 706 The NG RAN sends a handover Required request to the AMF, where the target eLTE cell information is carried.
  • Step 707 The UE switches to the eLTE base station, and the switching mode can adopt the switching mode in the prior art, and details are not described herein.
  • Step 708, 709 After the handover is completed, the optional SMF may initiate a PDU-CAN session modification request to the PCF to obtain a new Qos rule.
  • Step 710 The SMF sends an N2 session request, where the Qos rule is carried, and the request arrives at the AMF.
  • Step 711 The AMF establishes a request for the radio resource of the eLTE base station.
  • Step 712 eLTE sends an RRC reconfiguration request to the UE.
  • Step 713 The UE returns an RRC reconfiguration response.
  • Step 714 eLTE returns a radio resource establishment request response to the AMF.
  • Step 715 The AMF returns an N2 session request response to the SMF.
  • Step 716 The SMF returns a PDU-CAN session modification response to the PCF.
  • Step 717 The PCF returns a request resource response to the P-CSCF.
  • Step 718 The IMS system completes session establishment.
  • FIG. 13 is a flow chart of the service of the 5G system falling back from the NR to the eLTE in the 5G system, and the other services of the 5G system falling back from the NR to the eLTE:
  • Steps 801 to 802 are the same as steps 701 to 702;
  • Step 803 The P-CSCF initiates a session resource authorization request to the PCF.
  • Step 804 The PCF initiates a PDU-CAN session modification request to the SMF, where the QoS rule is included.
  • steps 805-808 steps 805a-807a; steps 805b-807b;
  • Step 805 The SMF sends a session request to the 5G RAN node, carrying the required 5G Qos information, and the message first arrives at the AMF;
  • Step 806 The AMF sends an N2 session request to the 5G RAN node, where the indication of handover to the eLTE base station is carried;
  • Step 807 The NG RAN sends a handover Required request to the AMF, where the target eLTE base station cell information is carried.
  • Step 808 The AMF sends an N2 session response to the SMF, indicating to switch to eLTE, and then establish a quality of service flow.
  • Step 805a The SMF sends an N2 session request to the 5G RAN node, where the 5G Qos parameter is carried, and the request is sent to the 5G RAN node through the AMF.
  • Step 806a The NG RAN sends an N2 session response to the SMF, indicating that the handover is to eLTE, and the response reaches the SMF through the AMF.
  • Step 807a The NG RAN sends a handover Required request to the AMF, where the target eLTE base station cell information is carried.
  • Step 805b The SMF sends an N2 session request to the 5G RAN node, where the 5G Qos parameter is carried, and the request is sent to the 5G RAN node through the AMF.
  • Step 806b The NG RAN sends a handover Required request to the AMF, where the target cell information is carried, and the N2 session can be carried to the eLTE indication.
  • Step 807b The AMF sends an N2 session response to the SMF, indicating to switch to eLTE, and then establish a quality of service flow.
  • Step 809 The UE switches to the eLTE base station.
  • Step 810 After the handover is completed, the QoS session is established on the eLTE in the 5G network, and the IMS session is established. Same as steps 709-718.
  • Figure 14 is a flow chart of the service upgrade from 4G to 5G in this embodiment, and the implementation of the service upgrade from 4G to 5G:
  • Step 901 The UE accesses at 4G, establishes a PDN connection, and registers with the IMS.
  • Step 902 IMS session establishment process
  • Step 903 The P-CSCF initiates a session resource authorization request to the PCF/PCRF.
  • Step 904 The PCRF initiates an IP-CAN session modification request to the PGW-C, where the QoS rule is included, optionally, and may also include the Qos rule information used by the 5G system.
  • Step 905 The PGW-C sends a Create Bearer Request to the S-GW, and the S-GW sends the request to the MME.
  • Step 906 The MME determines that the service needs to be established in the 5G network, and the MME sends a request to switch to the 5G to the eNB.
  • Step 907 The eNB sends a handover Required request to the MME, where the 5G target cell information is carried.
  • Step 908 The MME sends a Create Bearer response to the PGW-C through the S-GW, where it indicates that the service quality flow indication is established in the target measurement.
  • Step 909 The UE switches to 5G, and the process is the same as steps 202-212 of FIG. 5;
  • Step 910 After the handover is completed, the UE initiates a registration process in the 5G system.
  • the SMF can also generate the Qos rule of the 5G system locally according to the 4G Qos rule, or use the Qos rule of the 5G system provided in step 904, or take the following steps 912, 913:
  • Step 912 The SMF initiates a PDU-CAN session modification request to the PCF.
  • Step 913 The PCF returns the Qos rule of the 5G system to the SMF.
  • Step 914 The SMF sends an N2 session request, where the Qos rule is carried, and the request arrives at the AMF.
  • Step 915 The AMF establishes a request to the 5G RAN node radio resource.
  • Step 916 The 5G RAN sends an RRC reconfiguration request to the UE.
  • Step 917 The UE returns an RRC reconfiguration response.
  • Step 918 The 5G RAN returns a radio resource setup request response to the AMF.
  • Step 919 The AMF returns an N2 session request response to the SMF.
  • Step 920 The SMF returns a PDU-CAN session modification response to the PCF.
  • Step 921 The PCF returns a request resource response to the P-CSCF.
  • Step 922 The IMS system completes session establishment.
  • Embodiments of the present invention also provide a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • a mobile hard disk e.g., a hard disk
  • magnetic memory e.g., a hard disk
  • the processor performs, according to the stored program code in the storage medium, in the process of establishing the service of the user equipment, indicating that the source base station that connects the UE initiates the handover.
  • the processor performs, according to the stored program code in the storage medium, after the UE switches from the first access network to the second access network, initiates a bearer setup, or a quality of service Qos flow. set up.
  • Embodiments of the present invention also provide an electronic device comprising a memory and a processor having a computer program stored therein, the processor being arranged to execute a computer program to perform the steps of any of the method embodiments described above.
  • the electronic device may further include a transmission device and an input and output device, wherein the transmission device is connected to the processor, and the input and output device is connected to the processor.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the method, device, and system for network handover provided by the embodiments of the present invention have the following beneficial effects: the technical problem that the networks are too complicated to switch between networks in the related art is solved, and the UE is implemented while switching Less changes to the network and improved the process of simplifying network switching.

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Abstract

本发明实施例提供了一种网络切换的方法、装置及***，其中，该方法包括：在用户设备UE业务建立的过程中，第一网元指示连接所述UE的源基站发起切换；在所述UE从第一接入网络切换到第二接入网络后，第二网元发起承载建立，或服务质量Qos流建立。通过本发明实施例，解决了相关技术中网络之间相互切换时过于复杂的技术问题。

Description

网络切换的方法、装置及*** 技术领域
本发明涉及通信领域，具体而言，涉及一种网络切换的方法、装置及***。
背景技术
3GPP(3 rd Generation Partnership Project)从R8开始制定***(或称LTE，Long Term Evolution，长期演进)移动通信***中。其网络架构如图1所示，图1是本发明相关技术中的EPC架构图，架构中各网元的功能如下：
终端(UE，User Equipment)，主要通过无线空口接入4G网络并获得服务，终端通过空口和基站交互信息，通过非接入层信令NAS(non-Access Stratum)和核心网的移动性管理实体交互信息。
基站(RAN，Radio Access Network，eNB)，负责终端接入网络的空口资源调度和以及空口的连接管理。
移动管理实体：核心网控制面实体，主要负责对用户的鉴权、授权以及签约检查，用户移动性管理，PDN(Packet Data Network，分组数据网络)连接以及承载的维护，用户IDLE状态下触发寻呼等功能。
服务网关Serving GW(Gateway)：核心网用户面功能实体，主要负责漫游情况下和PDN GW的交互。
分组数据网关PDN GW(简称P-GW)：核心网用户面功能实体，是终端接入PDN网络的接入点，负责分配用户IP(Internet Protocol，网络协议)地址，网络触发的承载建立、修改和删除，还具有QoS(Quality of Service，服务质量)控制计费等功能，是用户在3GPP***内的锚点，从而保证IP地址不变，保证业务连续性。在控制与转发分离架构中，P-GW又分为2个部分，一个是控制实体PGW-C，一个是用户面实体PGW-U。 PGW-C负责信令控制，PGW-U负责IP转发。
归属签约服务器(HSS，Home Subscription Server)：存储了用户的签约信息。
策略控制与计费规则功能(PCRF，Policy and charging control function)，负责策略决策和计费规则的制定。PCRF提供了基于业务数据流的网络控制规则，这些网络控制包括业务数据流的检测、门控(Gating Control)、服务质量(Quality of Service，QoS)控制以及基于数据流的计费规则等。PCRF将其制定的策略和计费规则发送给P-GW执行。
3GPP从R14开始研究下一代通讯***(NextGen System)，下一代通讯***能够支持eMBB(Evolved Mobile Broadband，演进的移动宽带)、mMTC(Massive Machine Type Communication，超大连接机器通讯)、uMTC(Ultra Reliable Machine Type Communication，超可靠机器通讯)三种业务类型，这三种业务类型具有不同的网络特性。图2是本发明相关技术中下一代移动通信网络架构示意图，其中各网元的功能如下：
终端(UE,User Equipment)，主要通过下一代无线空口接入网络并获得服务，终端通过空口和基站交互信息，通过非接入层信令和核心网的公共控制面功能以及会话控制面功能交互信息。
下一代基站(NG RAN，Radio Access Network(简称RAN，无线电接入网))，负责终端接入网络的空口资源调度和以及空口的连接管理。下一代基站可能是新的无线接入技术(gNB)，也可能是增强LTE技术(eLTE)。
会话控制面功能(SMF，Session Management Function)：和终端交互，主要负责处理用户PDU(Packet Data Unit，分组数据单元)会话建立、修改和删除请求，选择UPF(User Plane function，用户面功能)；建立UE到UPF之间的用户面连接；和PCF(Policy Control Function，策略控制功能)一起确定会话的QoS(Quality of Service)参数等功能。
接入与移动性控制功能(AMF，Access and Mobility control Function)：是核心网内的公共控制面功能。一个用户只有一个AMF，其负责对用户 的鉴权、授权以及签约检查以保证用户是合法用户；用户移动性管理，包括位置注册和临时标识分配；当用户发起PDU(Packet Data Unit，分组数据单元)连接建立请求的时候，选择合适的SMF；转发UE和SMF之间的非接入层(NAS，Non Access Stratum)信令；转发基站和SMF之间的接入层AS(Access Stratum)信令。
用户面功能(UPF，User Plane Function)：提供用户面处理功能，包括数据转发、QoS执行。UPF还提供用户移动时候的用户面锚点，保证业务连续性。
策略控制功能(PCF，Policy Control Function)：提供资源的授权功能，其和4G时代的PCRF非常类似。
统一数据管理功能(UDM，Unified Data Management)：存储了用户的签约数据，其和4G时代的HSS非常类似。
NextGen System(5GS)的部署，开始会在热点地区局部部署，如市中心，商业中心等。当UE接入5G***中，随着用户的移动，移出了5G***的覆盖范围，用户UE被切换到4G***中。
图3是本发明相关技术中满足4G和5G双向切换的网络架构。其核心特点是该架构同时兼容4G和5G架构。其核心特点是PGW-C和SMF合一，PGW-U和UPF合一，PCF和PCRF合一，UE的用户面始终锚定在UPF/PGW-U上。在AMF和MME之间，增加Nx接口，在该接口上发送跨***间切换请求。这样UE在LTE和5G之间切换时，能够保证无缝切换。
当4G***中，UE和网络建立PDN connection，里面包含1个缺省承载(bearer)和多个专用承载。每个承载的信息包含了对应的业务流(Service flows)，及其QoS参数。在5G***中，UE和网络建立PDU session，里面包含1个缺省的服务质量流(Qos flow)和多个专用服务质量流。每个QoS flow包括了对应的业务流(Service flows)，及其QoS参数，如QoS profile和分组过滤器(packet filter)。
5G***向4G***切换中，是将5G***建立的PDU session，切换到4G***，转换为PDN connection。PDU session中的服务质量流，切换到4G***后，转化为承载。反之亦然。
图4是本发明相关技术中5G向4G切换的流程图，以下简要介绍
步骤100，终端UE在5G***中已经建立了PDU session，并可能建立了专用服务质量流(dedicated Qos flow)；
步骤101，源5G RAN节点发现需要切换到4G，发送切换请求给AMF，其中携带了目标小区信息；
步骤102，AMF向SMF请求4G对应的会话信息；
步骤103，AMF选择目标MME，发送Forward Relocation Request；
步骤104，MME向S-GW发送Create session request；
步骤105，MME向eNB发送handover request，请求无线资源；
步骤106，MME收到eNB响应后，发送Forward Relocation Response给AMF；
步骤107，AMF发送Handover command给5G RAN节点，5G RAN节点发送Handover command给UE；
步骤108，UE接入4G***，发Handover complete给eNB；
步骤109，eNB发送handover notify给MME；
步骤110～114，MME发起modify bearer request给S-GW，S-GW再发送给P-GW，最终完成媒体面的建立；
步骤115，UE在4G***做TAU过程(Tracking Area Update，跟踪区域更新)。
图5是本发明相关技术中4G向5G切换的流程图，包括：
步骤200，终端UE在4G***中已经建立了PDN connection，可能还建立了专用承载；
步骤201，源4G RAN节点(eNB)发现需要切换到5G，向MME发送切换请求，其中携带了目标小区信息；
步骤202，MME根据切换请求，选择目标AMF，向AMF发送Forward Relocation Request；
步骤203，AMF向SMF请求5G会话信息；
步骤204，AMF向5G RAN发送切换请求，预留资源；
步骤205，AMF根据5G RAN的信息，更新会话；
步骤206，AMF向MME返回Forward Relocation Response；
步骤207，MME向eNB发送handover command，eNB向UE发送handover command，其中包含了目标5G RAN的无线信息；
步骤208，UE接入目标5G RAN节点，发送Handover Complete
步骤209，5G RAN节点发送Handover Notify给AMF；
步骤210～212，AMF通知SMF切换完成，SMF修改媒体面；
步骤213，UE在5G***发起Registration过程；
此外，当gNB和eLTE基站同时接入5G核心网时，也会发生跨接入的切换，此时可以看做是5G***内切换，不再赘述。
在5G***部署初期，有些业务并不适合在5G基站上上提供，如IMS voice。此时如果UE接入在gNB上时，需要回退到4G***提供voice业务(VoLTE)，或者回退到eLTE基站提供voice业务；
图6是本发明相关技术3GPP***中CSFB的实现方式示意图，相关技术中的电路域回落(Circuit Switched Fallback，简称为CSFB)，包括：
步骤301，UE收到SIP(Session Initiation Protocol，会话初始协议)Invite请求；(对于主叫，忽略此步)
步骤302，UE向NG RAN节点发送extended Service Request(SR，服务请求)；(对于主叫，当UE发起呼叫时，触发该步骤)
步骤303，NG RAN节点将extended Service Request转发给AMF；
步骤304，通过PS handover切换到4G；
步骤305，对于被叫场景，UE在4G中发送SIP 183应答给IMS；
步骤305a，对于主叫场景，UE在4G***中发起SIP Invite请求；
步骤306，UE和远端完成IMS会话建立。
在相关技术的流程中，需要对网络和UE有很大的增强，UE和网络都需要知道对方有这种能力。UE需要知道基站虽然不支持某种业务，但是网络能在业务发起的时候，切换到支持该业务的基站/网络上。网络需要知道用户能够在进行业务的时候，触发extended Service Request，从而可以切换到目标网络/基站上。对于被叫场景，当UE收到应用层消息时，需要触发底层的信令，这种跨层触发，对于第三方的App非常困难。
针对相关技术中存在的上述问题，目前尚未发现有效的解决方案。
发明内容
本发明实施例提供了一种网络切换的方法、装置及***，以至少解决相关技术中网络之间相互切换时过于复杂的技术问题。
根据本发明的一个实施例，提供了一种网络切换的方法，包括：在用户设备UE业务建立的过程中，第一网元指示连接所述UE的源基站发起切换；在所述UE从第一接入网络切换到第二接入网络后，第二网元发起承载建立，或服务质量Qos流建立。
根据本发明的另一个实施例，提供了一种网络切换的***，包括：第一网元，第二网元，其中，所述第一网元包括：确定模块，设置为在用户设备UE业务建立的过程中，确定业务在第二接入网络建立；指示模块，设置为在用户设备UE业务建立的过程中，指示连接所述UE的源基站发起切换；所述第二网元包括：发起模块，设置为在所述UE从第一接入网络切换到所述第二接入网络后，发起承载建立，或服务质量Qos流建立。
根据本发明的又一个实施例，还提供了一种网络切换的装置，应用在 SMF，包括：接收模块，设置为接收用户设备在第一接入网络的以下业务请求至少之一：新的Qos规则，会话修改请求；确定模块，设置为确定所述业务在第二接入网络建立；发送模块，设置为通过AMF向所述第一接入网络的基站发送切换到所述第二接入网络的请求。
根据本发明的又一个实施例，还提供了另一种网络切换的装置，应用在gNB，包括：第一接收模块，设置为接收SMF发送的N2会话请求，其中，所述N2会话请求携带所述第一接入网络的Qos信息；第一发送模块，设置为通过AMF向所述SMF发送N2会话响应；第二发送模块，设置为向所述AMF发送切换请求handover Required，其中，所述切换请求携带目标小区信息。
根据本发明的又一个实施例，还提供了另一种网络切换的装置，应用在gNB，包括：接收模块，设置为接收从第一接入网络切换到第二接入网络的第一切换请求；发送模块，设置为根据所述切换请求向AMF发送将所述第一接入网络切换到所述第二接入网络的第二切换请求；其中，所述gNB应用在所述第一接入网络。
根据本发明的又一个实施例，还提供了一种存储介质。该存储介质设置为存储用于执行以下步骤的程序代码：在用户设备UE业务建立的过程中，指示连接所述UE的源基站发起切换；在所述UE从第一接入网络切换到第二接入网络后，发起承载建立，或服务质量Qos流建立。
根据本发明的又一个实施例，还提供了一种处理器，所述处理器用于运行程序，其中，所述程序运行时执行上述任一项方法实施例中的步骤。
根据本发明的又一个实施例，还提供了一种电子装置，包括存储器和处理器，所述存储器中存储有计算机程序，所述处理器被设置为运行所述计算机程序以执行上述任一项方法实施例中的步骤。
通过本发明实施例，在用户设备UE业务建立的过程中，第一网元指示连接UE的源基站发起切换；在UE从第一接入网络切换到第二接入网络后，第二网元发起承载建立，或服务质量Qos流建立。通过提供一种新 的网络切换方式，解决了相关技术中网络之间相互切换时过于复杂的技术问题，在实现切换的同时，对UE和网络的改动较少，提高了简化了网络的切换的过程。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是本发明相关技术中的EPC架构图；
图2是本发明相关技术中下一代移动通信网络架构示意图；
图3是本发明相关技术中满足4G和5G双向切换的网络架构；
图4是本发明相关技术中5G向4G切换的流程图；
图5是本发明相关技术中4G向5G切换的流程图；
图6是本发明相关技术3GPP***中CSFB的实现方式示意图；
图7是根据本发明实施例的网络切换的方法的流程图；
图8是根据本发明实施例的网络切换的***的结构框图；
图9本发明中SMF触发5G向4G回落流程图；
图10是本发明中AMF触发5G到4G切换流程图；
图11是本实施例中NG RAN节点触发5G到4G切换流程图；
图12是本实施例中业务从NR回落到eLTE的流程图；
图13本发明中5G***中业务从NR回落到eLTE流程图；
图14本实施例中业务从4G向5G升级的流程图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
需要说明的是，本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。
实施例1
本申请实施例可以运行于图3所示的网络架构上。
在本实施例中提供了一种运行于上述网络架构的网络切换的方法，图7是根据本发明实施例的网络切换的方法的流程图，如图7所示，该流程包括如下步骤：
步骤S702，在用户设备UE业务建立的过程中，第一网元指示连接UE的源基站发起切换；
步骤S704，在UE从第一接入网络切换到第二接入网络后，第二网元发起承载建立，或服务质量Qos流建立。
通过上述步骤，在用户设备UE业务建立的过程中，第一网元指示连接UE的源基站发起切换；在UE从第一接入网络切换到第二接入网络后，第二网元发起承载建立，或服务质量Qos流建立。通过提供一种新的网络切换方式，解决了相关技术中网络之间相互切换时过于复杂的技术问题，在实现切换的同时，对UE和网络的改动较少，提高了简化了网络的切换的过程。
可选地，上述步骤的执行主体第一网元包括以下至少之一：会话管理功能SMF，接入与移动性控制功能AMF，移动性管理功能MME，第一接入网络的基站等，当第一网元为MME时，第二网元节点为SMF；当第一网元为以下之一时：SMF，AMF，第一接入网络的基站，第二网元节点为PGW-C或SMF。但不限于此。
可选地，在用户设备UE业务建立的过程中，第一网元指示连接UE的源基站发起切换包括以下至少之一：
在收到建立请求时，第一网元指示连接UE的源基站发起切换；建立请求是基站收到的请求名称，对应的是第一网元为基站；
在收到新的Qos规则时，第一网元指示连接UE的源基站发起网络切换；
在收到资源建立请求时，第一网元指示连接UE的源基站发起切换；
在收到会话修改请求时，所述第一网元指示连接所述UE的源基站发起网络切换；会话修改请求是SMF/PGW-C收到的请求名称，对应的是第一网元为SMF。
在本实施例中，第一接入网络的基站包括以下至少之一：gNB(5G基站)，增强长期演进eLTE基站，LTE基站。
本实施例的方案可以在不同的网元实体上触发完成，下面以此分为不同的场景进行说明：
在第一网元为SMF时，第一网元指示连接UE的源基站发起切换包括：
S11，SMF确定业务在第二接入网络建立；
S12，SMF通过AMF向第一接入网络的基站发送切换到第二接入网络的请求。
在第一网元为AMF时，第一网元指示连接UE的源基站发起切换包括：
S21，AMF接收SMF发送的会话请求，其中，会话请求携带第一接入网络的Qos信息；
S22，AMF向第一接入网络发送N2会话请求，其中，N2会话请求携带切换到第二接入网络的指示；
S23，AMF接收第一接入网络发送的切换请求handover Required，其中，handover Required携带了目标小区信息；
AMF向SMF发送N2会话响应。
在第一网元为第一接入网络的连接UE的基站时，第一网元指示连接UE的源基站发起切换包括：
S31，第一接入网络的基站接收SMF发送的N2会话请求，其中，N2会话请求携带第一接入网络的Qos信息；
S32，第一接入网络的基站通过AMF向SMF发送N2会话响应；
S33，第一接入网络的基站向AMF发送切换请求handover Required，其中，切换请求携带目标小区信息。
在第一网元为第一接入网络的连接UE的基站时，第一网元指示连接UE的源基站发起切换包括：
S41，第一接入网络的基站接收SMF发送的N2会话请求，其中，N2会话请求携带第一接入网络的Qos信息；
S42，第一接入网络的基站向AMF发送切换请求handover Required，AMF向SMF发送N2会话响应，其中，切换请求携带了目标小区信息。
在第一网元为MME时，第一网元指示连接UE的源基站发起切换包括：
S51，MME接收PGW-C通过S-GW发送的建立承载请求Create Bearer Request；
S52，MME确定建立承载请求对应的业务需要在第二接入网络建立；
S53，MME发送切换到第二接入网络的请求给第一接入网络的基站。
可选的，上述场景中的N2会话响应携带用于指示UE切换到第二接入网络的信息。
在本实施例中，第一接入网络为新无线NR接入网，第二接入网络为长期演进LTE接入网；或，第一接入网络为LTE接入网，第二接入网络为NR接入网。
在本实施例中，SMF-C和PGW-C是合设网元，并且相互之间可以有内部交互：比如
当第一网元是SMF时，UE切换到第二网络时，第二网元PGW-C怎么知道要去在第二网络建立承载呢，这是因为SMF和PGW-C是合设网元 SMF-C内部通知了PGW-C，所以切换完成后，PGW-C会发起承载建立；
当第一网元是AMF，或者gNB时，它们在应答消息中，通知SMF，UE会切换到第二网络。SMF和第二网元PGW-C是合设网元SMF内部通知了PGW-C，所以切换完成后，PGW-C会发起承载建立；
或者当第一网元是AMF，或者gNB时，由于在源网络承载或服务质量流建立中发生了切换，SMF知道切换发生。SMF和第二网元PGW-C是合设网元SMF内部通知了PGW-C，所以切换完成后，PGW-C会发起承载建立；
当MME是第一网元时，它应该在步骤(MME通过S-GW想PGW-C发送Create Bearer响应，其中指示了在目标测建立服务质量流指示)告知PGW-C，UE切换到第二网络。PGW-C和第二网元SMF是合设网元PGW-C内部通知了SMF，所以切换完成后，SMF会发起Qos flow建立。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到根据上述实施例的方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，或者网络设备等)执行本发明各个实施例所述的方法。
实施例2
在本实施例中还提供了一种网络切换的***，该装置用于实现上述实施例及优选实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图8是根据本发明实施例的网络切换的***的结构框图，如图8所示，该装置包括：第一网元80，第二网元82，其中，
第一网元80包括：
确定模块800，设置为在用户设备UE业务建立的过程中，确定业务在第二接入网络建立；
指示模块802，设置为在用户设备UE业务建立的过程中，指示连接UE的源基站发起切换；
第二网元82包括：发起模块820，设置为在UE从第一接入网络切换到第二接入网络后，发起承载建立，或服务质量Qos流建立。
可选的，指示模块802包括以下至少之一：第一指示单元，设置为在收到承载建立请求时，指示连接UE的源基站发起切换；第二指示单元，设置为在收到新的Qos规则时，指示连接UE的源基站发起切换；第三指示单元，设置为在收到资源建立请求时，指示连接UE的源基站发起切换；第四指示单元，设置为在收到会话修改请求时，指示连接所述UE的源基站发起切换。
可选的，第一网元80包括以下至少之一：会话管理功能SMF，接入与移动性控制功能AMF，移动性管理功能MME，第一接入网络的基站。
可选的，第一接入网络的基站包括以下至少之一：gNB，增强长期演进eLTE，LTE基站。
可选的，第二网元82包括：第二接入网络的核心网网元。
根据本实施例的不同应用场景，在第一网元80为SMF时，指示模块802设置为：通过AMF向第一接入网络的基站发送切换到第二接入网络的请求。
在第一网元80为AMF时，指示模块802设置为：接收SMF发送的会话请求，其中，会话请求携带第一接入网络的Qos信息；向第一接入网络发送N2会话请求，其中，N2会话请求携带切换到第二接入网络的指示； 接收第一接入网络发送的切换请求handover Required，其中，handover Required携带了目标小区信息；向SMF发送N2会话响应。
在第一网元80为第一接入网络的连接UE的基站时，指示模块802设置为：接收SMF发送的N2会话请求，其中，N2会话请求携带第一接入网络的Qos信息；通过AMF向SMF发送N2会话响应；向AMF发送切换请求handover Required，其中，切换请求携带目标小区信息。
在第一网元80为第一接入网络的连接UE的基站时，指示模块802设置为：接收SMF发送的N2会话请求，其中，N2会话请求携带第一接入网络的Qos信息；向AMF发送切换请求handover Required，AMF向SMF发送N2会话响应，其中，切换请求携带了目标小区信息。
在第一网元80为MME时，确定模块800设置为：接收PGW-C通过S-GW发送的建立承载请求Create Bearer Request；确定建立承载请求对应的业务需要在第二接入网络建立；指示模块802设置为：发送切换到第二接入网络的请求给第一接入网络的基站。
可选的，本实施例的第一接入网络为新无线NR接入网，第二接入网络为长期演进LTE接入网；或，第一接入网络为LTE接入网，第二接入网络为NR接入网。
可选的，当第一网元80为MME时，第二网元82节点为SMF；或，当第一网元80为以下之一时：SMF，AMF，第一接入网络的基站，第二网元82节点为PGW-C或SMF。
可选的，N2会话响应携带用于指示UE切换到第二接入网络的信息。
本实施例还提供了一种网络切换的装置，应用在SMF，包括：接收模块，设置为接收用户设备在第一接入网络的以下业务请求至少之一：新的Qos规则，会话修改请求；确定模块，与接收模块连接，设置为确定业务在第二接入网络建立；发送模块，与确定模块连接，设置为通过AMF向第一接入网络的基站发送切换到第二接入网络的请求。
本实施例还提供了另一种网络切换的装置，应用在gNB，包括：第一 接收模块，设置为接收SMF发送的N2会话请求，其中，N2会话请求携带第一接入网络的Qos信息；第一发送模块，设置为通过AMF向SMF发送N2会话响应；第二发送模块，设置为向AMF发送切换请求handover Required，其中，切换请求携带目标小区信息。无线承载请求和N2会话请求功能相同，收到N2会话请求，里面携带了Qos信息，即要基站建立无线承载。
可选的，N2会话响应携带用于指示UE切换到第二接入网络的信息。
本实施例还提供了另一种网络切换的装置，应用在gNB，包括：接收模块，设置为接收从第一接入网络切换到第二接入网络的第一切换请求；发送模块，设置为根据切换请求向AMF发送将第一接入网络切换到第二接入网络的第二切换请求；其中，gNB应用在第一接入网络。
需要说明的是，上述各个模块是可以通过软件或硬件来实现的，对于后者，可以通过以下方式实现，但不限于此：上述模块均位于同一处理器中；或者，上述各个模块以任意组合的形式分别位于不同的处理器中。
实施例3
本实施例是根据本发明的可选实施例，用于结合具体的实施方案对本申请进行详细的说明：
本实施例提出了一种业务回落的方法及***。在业务建立的过程中，网络节点在收到媒体面建立请求，或新的Qos rule，或资源建立请求时，指示基站发起切换。切换到第二接入网络，或第二基站后，网络节点再发起建立新的服务质量流，或承载。
本实施例包括多个实施方式：
图9本发明中SMF触发5G向4G回落流程图，SMF触发5G向4G回落实施方式，包括：
步骤401：终端UE在5G***中接入，建立PDU session。并且完成 了IMS注册；
步骤402：IMS会话建立过程；
步骤403：P-CSCF向PCF/PCRF发起会话资源授权请求；
步骤404：PCF向SMF发起PDU-CAN会话修改请求，其中包含了QoS rule，可选的，其中也可以包含4G***使用的Qos rule信息；
步骤405：SMF判断该业务需要在4G网络建立，SMF发送切换到4G的请求该请求通过AMF发送到5G RAN节点；
步骤406：NG RAN向AMF发送handover Required请求，其中携带了目标小区信息；
步骤407：UE切换到4G，该流程同图4步骤102～114；
步骤408：切换完成后，UE在4G***中发起TAU过程；
PGW-C也可以本地根据5G Qos rule生成4G***的Qos rule，或者使用步骤404提供的4G***的Qos rule，或采取如下409，410步骤：
步骤409：PGW-C向PCRF发起IP-CAN session modification请求；
步骤410：PCRF向PGW-C返回4G***的Qos rule；
下面步骤是在目标网络中，现有技术建立承载过程：
步骤411：PGW-C向S-GW发送Create session请求，S-GW将该请求转发给MME，其中携带了4G Qos rule；
步骤412：MME向eNB发送承载建立请求；
步骤413：eNB向UE发送RRC重配置请求；
步骤414：UE返回RRC重配置响应；
步骤415：eNB向MME返回承载建立请求响应；
步骤416：MME向S-GW返回Create session请求响应，S-GW转发给PGW-C；
步骤417：PGW-C向PCRF返回QoS rule安装响应；
步骤418：PCRF向P-CSCF返回请求资源响应；
步骤419：IMS***完成会话建立。
图10是本发明中AMF触发5G到4G切换流程图，AMF触发5G到4G切换的实施方式；
步骤501～504，与步骤401～404相同；
步骤505：SMF向5G RAN节点发送会话请求，携带了要求5G Qos信息，该消息先到达AMF；
步骤506：AMF向5G RAN节点发送N2会话请求，其中携带了切换到4G的指示；
步骤507：NG RAN向AMF发送handover Required请求，其中携带了目标小区信息；
步骤508：AMF向SMF发送N2会话响应，指示切换到4G，再建立承载；
步骤509：同步骤407，UE切换到4G；这里UE可能会触发TAU过程(同步骤408)；
步骤510：切换完成后，PGW-C在4G建立专用承载，同步骤409～418；随后IMS(IP Multimedia Subsystem，IP多媒体子***)***完成会话建立。
图11是本实施例中NG RAN节点触发5G到4G切换流程图，NG RAN节点触发5G到4G切换的实施方式；
步骤601～604，与步骤401～404相同；
步骤605：SMF向5G RAN节点发送N2会话请求，其中携带了5G Qos参数，该请求通过AMF发送到5G RAN节点；
步骤606：NG RAN向SMF发送N2会话响应，指示切换到4G，该响应通过AMF到达SMF。
步骤607：NG RAN向AMF发送handover Required请求，其中携带 了目标小区信息；
上述的步骤606-607，也可以替换成下面的步骤606a-607a：
步骤606a：NG RAN向AMF发送handover Required请求，其中携带了目标小区信息，并且可以携带了N2会话切换到4G指示；
步骤607a：AMF向SMF发送N2会话响应，指示切换到4G；
步骤608：同步骤407，UE切换到4G；这里UE可能会触发TAU过程(同步骤408)；
步骤609：切换完成后，PGW-C在4G建立专用承载，同步骤409～418；随后IMS***完成会话建立。
图12是本实施例中业务从NR回落到eLTE的流程图，5G***中，业务从NR回落到eLTE的实施方式。与前面图不同的是，5G RAN节点和eLTE基站均通过AMF接入5G核心网。但是发明基本点是一样的。在建立Qos流的时候，从5G RAN切换到eLTE基站上。
步骤701～702，与步骤401～402相同；在步骤702时，UE当前接入基站为5G RAN节点；
步骤703：P-CSCF向PCF发起会话资源授权请求；
步骤704：PCF向SMF发起PDU-CAN会话修改请求，其中包含了QoS rule；
步骤705：SMF判断该业务需要在eLTE基站上建立，SMF发送切换到eLTE基站的请求，该请求通过AMF发送到5G RAN节点；
步骤706：NG RAN向AMF发送handover Required请求，其中携带了目标eLTE小区信息；
步骤707：UE切换到eLTE基站，该切换方式可以采用现有技术中的切换方式，不再赘述；
步骤708，709：切换完成后，可选的SMF可以向PCF发起PDU-CAN session modification请求，获取新的Qos rule；
下面步骤是5G网络中在eLTE建立服务质量流现有技术过程：
步骤710：SMF发送N2会话请求，其中携带了Qos rule，该请求到达AMF；
步骤711：AMF向eLTE基站无线资源建立请求；
步骤712：eLTE向UE发送RRC重配置请求；
步骤713：UE返回RRC重配置响应；
步骤714：eLTE向AMF返回无线资源建立请求响应；
步骤715：AMF向SMF返回N2会话请求响应；
步骤716：SMF向PCF返回PDU-CAN session modification响应；
步骤717：PCF向P-CSCF返回请求资源响应；
步骤718：IMS***完成会话建立。
图13本发明中5G***中业务从NR回落到eLTE流程图，5G***中业务从NR回落到eLTE的其它实施方式：
步骤801～802，与步骤701～702相同；
步骤803：P-CSCF向PCF发起会话资源授权请求；
步骤804：PCF向SMF发起PDU-CAN会话修改请求，其中包含了QoS rule；
类似图10，图11，下面有三种实施方式：步骤805～808；步骤805a～807a；步骤805b～807b；
步骤805：SMF向5G RAN节点发送会话请求，携带了要求5G Qos信息，该消息先到达AMF；
步骤806：AMF向5G RAN节点发送N2会话请求，其中携带了切换到eLTE基站的指示；
步骤807：NG RAN向AMF发送handover Required请求，其中携带了目标eLTE基站小区信息；
步骤808：AMF向SMF发送N2会话响应，指示切换到eLTE，再建立服务质量流。
或；
步骤805a：SMF向5G RAN节点发送N2会话请求，其中携带了5G Qos参数，该请求通过AMF发送到5G RAN节点；
步骤806a：NG RAN向SMF发送N2会话响应，指示切换到eLTE，该响应通过AMF到达SMF；
步骤807a：NG RAN向AMF发送handover Required请求，其中携带了目标eLTE基站小区信息。
或；
步骤805b：SMF向5G RAN节点发送N2会话请求，其中携带了5G Qos参数，该请求通过AMF发送到5G RAN节点；
步骤806b：NG RAN向AMF发送handover Required请求，其中携带了目标小区信息，并且可以携带了N2会话切换到eLTE指示；
步骤807b：AMF向SMF发送N2会话响应，指示切换到eLTE,再建立服务质量流。
步骤809：UE切换到eLTE基站；
步骤810：切换完成后，5G网络中在eLTE建立服务质量流，并完成IMS会话建立。同步骤709～718。
图14本实施例中业务从4G向5G升级的流程图，业务从4G向5G升级的实施方式：
步骤901：UE在4G接入，建立PDN connection，IMS注册；
步骤902：IMS会话建立过程；
步骤903：P-CSCF向PCF/PCRF发起会话资源授权请求；
步骤904：PCRF向PGW-C发起IP-CAN会话修改请求，其中包含了 QoS rule，可选的，其中也可以包含5G***使用的Qos rule信息；
步骤905：PGW-C向S-GW发送Create Bearer Request，S-GW将该请求发给MME；
步骤906：MME判断该业务需要在5G网络建立，MME发送切换到5G的请求给eNB；
步骤907：eNB向MME发送handover Required请求，其中携带了5G目标小区信息；
步骤908：MME通过S-GW想PGW-C发送Create Bearer响应，其中指示了在目标测建立服务质量流指示；
步骤909：UE切换到5G，该流程同图5步骤202～212；
步骤910：切换完成后，UE在5G***中发起Registration过程；
SMF也可以本地根据4G Qos rule生成5G***的Qos rule，或者使用步骤904提供的5G***的Qos rule，或采取如下912，913步骤：
步骤912：SMF向PCF发起PDU-CAN session modification请求；
步骤913：PCF向SMF返回5G***的Qos rule。
下面步骤是5G网络中建立服务质量流现有技术过程：
步骤914：SMF发送N2会话请求，其中携带了Qos rule，该请求到达AMF；
步骤915：AMF向5G RAN节点无线资源建立请求；
步骤916：5G RAN向UE发送RRC重配置请求；
步骤917：UE返回RRC重配置响应；
步骤918：5G RAN向AMF返回无线资源建立请求响应；
步骤919：AMF向SMF返回N2会话请求响应；
步骤920：SMF向PCF返回PDU-CAN session modification响应；
步骤921：PCF向P-CSCF返回请求资源响应；
步骤922：IMS***完成会话建立。
实施例4
本发明的实施例还提供了一种存储介质。可选地，在本实施例中，上述存储介质可以被设置为存储用于执行以下步骤的程序代码：
S1，在用户设备UE业务建立的过程中，指示连接所述UE的源基站发起切换；
S2，在所述UE从第一接入网络切换到第二接入网络后，发起承载建立，或服务质量Qos流建立。
可选地，在本实施例中，上述存储介质可以包括但不限于：U盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
可选地，在本实施例中，处理器根据存储介质中已存储的程序代码执行在用户设备UE业务建立的过程中，指示连接所述UE的源基站发起切换。
可选地，在本实施例中，处理器根据存储介质中已存储的程序代码执行在所述UE从第一接入网络切换到第二接入网络后，发起承载建立，或服务质量Qos流建立。
可选地，本实施例中的具体示例可以参考上述实施例及可选实施方式中所描述的示例，本实施例在此不再赘述。
本发明的实施例还提供了一种电子装置，包括存储器和处理器，该存储器中存储有计算机程序，该处理器被设置为运行计算机程序以执行上述任一项方法实施例中的步骤。
可选地，上述电子装置还可以包括传输设备以及输入输出设备，其中，该传输设备和上述处理器连接，该输入输出设备和上述处理器连接。
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
工业实用性
如上所述，本发明实施例提供的一种网络切换的方法、装置及***具有以下有益效果：解决了相关技术中网络之间相互切换时过于复杂的技术问题，在实现切换的同时，对UE和网络的改动较少，提高了简化了网络的切换的过程。

Claims (33)

  1. 一种网络切换的方法，包括：
    在用户设备UE业务建立的过程中，第一网元指示连接所述UE的源基站发起切换；
    在所述UE从第一接入网络切换到第二接入网络后，第二网元发起承载建立，或服务质量Qos流建立。
  2. 根据权利要求1所述的方法，其中，UE业务建立的过程中，第一网元指示连接所述UE的源基站发起切换包括以下至少之一：
    在收到承载建立请求时，所述第一网元指示连接所述UE的源基站发起切换；
    在收到新的Qos规则时，所述第一网元指示连接所述UE的源基站发起网络切换；
    在收到会话修改请求时，所述第一网元指示连接所述UE的源基站发起网络切换；
    在收到资源建立请求时，所述第一网元指示连接所述UE的源基站发起切换。
  3. 根据权利要求1所述的方法，其中，所述第一网元包括以下至少之一：会话管理功能SMF，接入与移动性控制功能AMF，移动性管理功能MME，所述第一接入网络的基站。
  4. 根据权利要求3所述的方法，其中，所述第一接入网络的基站包括以下至少之一：gNB，增强长期演进eLTE基站，LTE基站。
  5. 根据权利要求3所述的方法，其中，在所述第一网元为SMF时，所述第一网元指示连接所述UE的源基站发起切换包括：
    所述SMF确定所述业务在所述第二接入网络建立；
    所述SMF通过AMF向所述第一接入网络的基站发送切换到所述 第二接入网络的请求。
  6. 根据权利要求3所述的方法，其中，在所述第一网元为AMF时，所述第一网元指示连接所述UE的源基站发起切换包括：
    所述AMF接收SMF发送的会话请求，其中，所述会话请求携带第一接入网络的Qos信息；
    所述AMF向第一接入网络发送N2会话请求，其中，所述N2会话请求携带切换到所述第二接入网络的指示；
    所述AMF接收所述第一接入网络发送的切换请求handover Required，其中，所述handover Required携带了目标小区信息；
    所述AMF向所述SMF发送N2会话响应。
  7. 根据权利要求3所述的方法，其中，在所述第一网元为所述第一接入网络的连接所述UE的基站时，所述第一网元指示连接所述UE的源基站发起切换包括：
    所述第一接入网络的基站接收SMF发送的N2会话请求，其中，所述N2会话请求携带第一接入网络的Qos信息；
    所述第一接入网络的基站通过AMF向所述SMF发送N2会话响应；
    所述第一接入网络的基站向AMF发送切换请求handover Required，其中，所述切换请求携带目标小区信息。
  8. 根据权利要求3所述的方法，其中，在所述第一网元为所述第一接入网络的连接所述UE的基站时，所述第一网元指示连接所述UE的源基站发起切换包括：
    所述第一接入网络的基站接收SMF发送的N2会话请求，其中，所述N2会话请求携带第一接入网络的Qos信息；
    所述第一接入网络的基站向AMF发送切换请求handover Required，AMF向SMF发送N2会话响应，其中，所述切换请求携 带了目标小区信息。
  9. 根据权利要求1至8任一项所述的方法，其中，
    所述第一接入网络为新无线NR接入网，第二接入网络为长期演进LTE接入网；或，
    所述第一接入网络为LTE接入网，第二接入网络为NR接入网。
  10. 根据权利要求3所述的方法，其中，
    当所述第一网元为MME时，所述第二网元节点为SMF；或
    当所述第一网元为以下之一时：SMF，AMF，第一接入网络的基站，所述第二网元节点为PGW-C或SMF。
  11. 根据权利要求6至8任一项所述的方法，其中，所述N2会话响应携带用于指示UE切换到所述第二接入网络的信息。
  12. 根据权利要求3所述的方法，其中，在所述第一网元为MME时，所述第一网元指示连接所述UE的源基站发起切换包括：
    所述MME接收PGW-C通过S-GW发送的建立承载请求Create Bearer Request；
    所述MME确定所述建立承载请求对应的业务需要在所述第二接入网络建立；
    所述MME发送切换到所述第二接入网络的请求给所述第一接入网络的基站。
  13. 一种网络切换的***，包括：
    第一网元，第二网元，其中，
    所述第一网元包括：
    确定模块，设置为在用户设备UE业务建立的过程中，确定业务在第二接入网络建立；
    指示模块，设置为在用户设备UE业务建立的过程中，指示连接所述UE的源基站发起切换；
    所述第二网元包括：
    发起模块，设置为在所述UE从第一接入网络切换到所述第二接入网络后，发起承载建立，或服务质量Qos流建立。
  14. 根据权利要求13所述的***，其中，所述指示模块包括以下至少之一：
    第一指示单元，设置为在收到承载建立请求时，指示连接所述UE的源基站发起切换；
    第二指示单元，设置为在收到新的Qos规则时，指示连接所述UE的源基站发起切换；
    第三指示单元，设置为在收到资源建立请求时，指示连接所述UE的源基站发起切换；
    第四指示单元，设置为在收到会话修改请求时，指示连接所述UE的源基站发起切换。
  15. 根据权利要求13所述的***，其中，所述第一网元包括以下至少之一：会话管理功能SMF，接入与移动性控制功能AMF，移动性管理功能MME，所述第一接入网络的基站。
  16. 根据权利要求15所述的***，其中，所述第一接入网络的基站包括以下至少之一：gNB，增强长期演进eLTE，LTE基站。
  17. 根据权利要求13所述的***，其中，所述第二网元包括：所述第二接入网络的核心网网元。
  18. 根据权利要求15所述的***，其中，在所述第一网元为SMF时，所述指示模块设置为：
    通过AMF向所述第一接入网络的基站发送切换到所述第二接入网络的请求。
  19. 根据权利要求15所述的***，其中，在所述第一网元为AMF时，所述指示模块设置为：
    接收SMF发送的会话请求，其中，所述会话请求携带第一接入网络的Qos信息；
    向第一接入网络发送N2会话请求，其中，所述N2会话请求携带切换到所述第二接入网络的指示；
    接收所述第一接入网络发送的切换请求handover Required，其中，所述handover Required携带了目标小区信息；
    向所述SMF发送N2会话响应。
  20. 根据权利要求15所述的***，其中，在所述第一网元为所述第一接入网络的连接所述UE的基站时，所述指示模块设置为：
    接收SMF发送的N2会话请求，其中，所述N2会话请求携带第一接入网络的Qos信息；
    通过AMF向所述SMF发送N2会话响应；
    向AMF发送切换请求handover Required，其中，所述切换请求携带目标小区信息。
  21. 根据权利要求15所述的***，其中，在所述第一网元为所述第一接入网络的连接所述UE的基站时，所述指示模块设置为：
    接收SMF发送的N2会话请求，其中，所述N2会话请求携带第一接入网络的Qos信息；
    向AMF发送切换请求handover Required，AMF向SMF发送N2会话响应，其中，所述切换请求携带了目标小区信息。
  22. 根据权利要求13至21任一项所述的***，其中，
    所述第一接入网络为新无线NR接入网，第二接入网络为长期演 进LTE接入网；或，
    所述第一接入网络为LTE接入网，第二接入网络为NR接入网。
  23. 根据权利要求15所述的***，其中，
    当所述第一网元为MME时，所述第二网元节点为SMF；或
    当所述第一网元为以下之一时：SMF，AMF，第一接入网络的基站，所述第二网元节点为PGW-C或SMF。
  24. 根据权利要求19至21任一项所述的***，其中，所述N2会话响应携带用于指示UE切换到所述第二接入网络的信息。
  25. 根据权利要求15所述的***，其中，在所述第一网元为MME时，所述确定模块设置为：
    接收PGW-C通过S-GW发送的建立承载请求Create Bearer Request；
    确定所述建立承载请求对应的业务需要在所述第二接入网络建立。
  26. 根据权利要求25所述的***，其中，所述指示模块设置为：
    发送切换到所述第二接入网络的请求给所述第一接入网络的基站。
  27. 一种网络切换的装置，应用在SMF，包括：
    接收模块，设置为接收用户设备在第一接入网络的以下业务请求至少之一：新的Qos规则，会话修改请求；
    确定模块，设置为确定所述业务在第二接入网络建立；
    发送模块，设置为通过AMF向所述第一接入网络的基站发送切换到所述第二接入网络的请求。
  28. 一种网络切换的装置，应用在gNB，包括：
    第一接收模块，设置为接收SMF发送的N2会话请求，其中，所 述N2会话请求携带所述第一接入网络的Qos信息；
    第一发送模块，设置为通过AMF向所述SMF发送N2会话响应；
    第二发送模块，设置为向所述AMF发送切换请求handover Required，其中，所述切换请求携带目标小区信息。
  29. 根据权利要求28所述的装置，其中，所述N2会话响应携带用于指示UE切换到第二接入网络的信息。
  30. 一种网络切换的装置，应用在gNB，包括：
    接收模块，设置为接收从第一接入网络切换到第二接入网络的第一切换请求；
    发送模块，设置为根据所述切换请求向AMF发送将所述第一接入网络切换到所述第二接入网络的第二切换请求；
    其中，所述gNB应用在所述第一接入网络。
  31. 一种存储介质，所述存储介质包括存储的程序，其中，所述程序运行时执行权利要求1至12中任一项所述的方法。
  32. 一种处理器，所述处理器用于运行程序，其中，所述程序运行时执行权利要求1至12中任一项所述的方法。
  33. 一种电子装置，包括存储器和处理器，所述存储器中存储有计算机程序，所述处理器被设置为运行所述计算机程序以执行所述权利要求1至12任一项中所述的方法。
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