WO2018233445A1 - 网络系统的切换处理方法、装置及系统、存储介质 - Google Patents

网络系统的切换处理方法、装置及系统、存储介质 Download PDF

Info

Publication number
WO2018233445A1
WO2018233445A1 PCT/CN2018/088267 CN2018088267W WO2018233445A1 WO 2018233445 A1 WO2018233445 A1 WO 2018233445A1 CN 2018088267 W CN2018088267 W CN 2018088267W WO 2018233445 A1 WO2018233445 A1 WO 2018233445A1
Authority
WO
WIPO (PCT)
Prior art keywords
smf
session information
amf
session
network system
Prior art date
Application number
PCT/CN2018/088267
Other languages
English (en)
French (fr)
Inventor
李振东
朱进国
卢飞
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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
Publication of WO2018233445A1 publication Critical patent/WO2018233445A1/zh

Links

Images

Classifications

    • 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
    • H04W36/0022—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

Definitions

  • the present disclosure relates to the field of communications, and in particular, to a handover processing method, apparatus, and system for a network system, and a storage medium.
  • the 3rd Generation Partnership Project (3GPP) started from the R8 to develop a fourth-generation Long Term Evolution (LTE) mobile communication system. Its network architecture is shown in Figure 1. The functions of each network element in the architecture are as follows:
  • the terminal (User Equipment, UE for short) 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 the mobility of the non-access stratum (NAS) and the core network through the non-access stratum. Manage entity interaction 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 core network control plane entity, which is mainly responsible for user authentication, authorization, and subscription checking, user mobility management, packet data network (PDN) connection, and bearer maintenance. Trigger paging and other functions.
  • PDN packet data network
  • Service Gateway Serving GW The core network user plane function entity, which is mainly responsible for the interaction with the PDN GW in the case of roaming.
  • Packet data gateway PDN GW The core network user plane function entity is the access point of the terminal accessing the PDN network. It is responsible for allocating user IP addresses, network triggered bearer establishment, modification and deletion, and also has QoS control and accounting functions. The user's anchor point in the 3GPP system ensures that the IP address is unchanged and business continuity is guaranteed.
  • 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 network architecture in which the functions of each network element are as follows:
  • the UE 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 exchanges information through the non-access layer signaling and the common control plane function of the core network and the session control plane function.
  • the next-generation base station (NG RAN, Radio Access Network, gNB) is responsible for air interface resource scheduling and air interface connection management of the terminal access network.
  • NG RAN Radio Access Network, gNB
  • Session Management Function interacts with the terminal. It is mainly responsible for handling the establishment, modification, and deletion of the user (Packet Data Unit, PDU for short), and selecting the User Plane function (User Plane function, referred to as UPF); establishes a user plane connection between the UE and the UPF; and a policy control function (Policy Control Function, PCF for short) to determine the session quality (QoS) parameters of the session.
  • PDU Packet Data Unit
  • UPF User Plane function
  • PCF Policy Control Function
  • AMCF Access and Mobility Control Function
  • a user has only one AMCF, which is responsible for authentication, authorization, and subscription checking of the user to ensure that the user is a legitimate user; user mobility management, including location registration and temporary identity allocation; when the user initiates a Packet Data Unit (Packet Data Unit, referred to as For the PDU) connection establishment request, select the appropriate SMF; forward the non-access stratum (Non Access Stratum, NAS for short) signaling between the UE and the SMF; and forward the access layer between the base station and the SMF (Access Stratum) , referred to as AS) signaling.
  • Packet Data Unit Packet Data Unit
  • For the PDU Packet Data Unit
  • SMF Packet Data Unit
  • AS Access Stratum
  • 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 The functionality provided is very similar to the PCRF in the 4G era.
  • Unified Data Management Stores user subscription data, which is very similar to HSS in the 4G era.
  • NextGen System NextGen System
  • hotspots such as downtown, commercial centers, etc.
  • the coverage of the 5G system must be removed as the user moves. How to seamlessly switch to the 4G system, otherwise the session will be interrupted.
  • Figure 3 is a network architecture that satisfies 4G ⁇ -->5G bidirectional handover.
  • 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.
  • AMF Authentication Management Function
  • MME Authentication Management Function
  • 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.
  • each bearer represents a corresponding service flows, and its QoS parameters.
  • the concept of QoS flow is adopted, and each QoS flow includes a corresponding QoS profile and a packet filter.
  • 4 is a flow chart of switching from 4G to 5G in the prior art, which mainly includes the following steps:
  • Step 400 The terminal UE has established a PDN connection in the 4G system, and may also establish a dedicated bearer.
  • Step 401 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 402 The MME selects a target AMF according to the handover request, and sends a Forward Relocation Request to the AMF, where the PGW-C/SMF and the S-GW address are carried.
  • Step 403 The AMF sends a PDU Session Handover Request to the SMF/PGW-C address according to the SMF/PGW-C address, and the request is first sent to the vSMF in the roaming scenario or the deployment reason.
  • Step 404 The vSMF forwards a PDU session handover request (Session Handover Request) to the SMF/PGW-C.
  • Step 405 If the PCC is deployed, the SMF may initiate a PDU-CAN Session Modification to the PCF/PCRF to obtain a 5GS PCC rule for switching to the 5G PDU session. At this time, the PCF/PCRF does not directly apply the 5GS PCC rule to the PDU session.
  • Step 406 The TSMF/PGW-C initiates an N4 session modification to the UPF/PGW-U to obtain uplink tunnel information.
  • Step 407 The SMF/PGW-C sends a PDU session handover response (Session Handover Response) to the AMF, which carries the authorized 5G Qos rule, the EPS bearer setup list, and the uplink tunnel information of the UPF/PGW-U.
  • PDU session handover Response Session Handover Response
  • the message is first sent to the vSMF.
  • Step 408 The vSMF selects a vUPF and initiates an N4 Session Establishment process.
  • the vSMF provides the UPF/PGW-U uplink tunnel information to the vUPF, and the vUPF generates the v-CN tunnel information (N3 uplink tunnel, N9 downlink tunnel) and sends it to the vSMF.
  • the vSMF forwards the PDU Session Handover Response to the AMF, which carries the authorized 5G Qos rule, the EPS bearer Setup List, and the uplink tunnel information of the vUPF.
  • Step 409 The AMF sends a Handover Request request to the 5G RAN node, where at least the PDU session ID, the corresponding QoS profile, and the uplink tunnel information are included.
  • Step 410 The 5G RAN node sends a Handover Request Acknowledge to the AMF, where the N3 downlink tunnel information is included.
  • Step 411 The AMF sends a Modify PDU Session Request to the SMF/PGW-C, which includes downlink N3 tunnel information.
  • the message is first sent to the vSMF, and the vSMF replaces the N3 downlink tunnel information with the N9 downlink tunnel information allocated in step 408, and sends the information to the SMF/PGW-C.
  • Step 412 The SMF/PGW-C sends a Modify PDU Response to the AMF.
  • the message is sent to the vSMF first, and the vSMF is sent to the AMF.
  • Step 413 The SMF/PGW-C requests the UPF/PGW-U to establish a temporary forwarding tunnel.
  • Step 414 The AMF sends a Forward Relocation Response to the MME, where the service gateway change indication includes a Serving GW change indication, an EPS Bearer Setup List, a TEIDs, and the like.
  • the service gateway change indication includes a Serving GW change indication, an EPS Bearer Setup List, a TEIDs, and the like.
  • Step 415 The MME sends a Create Indirect Data Forwarding Tunnel Request to the S-GW to request to establish a temporary forwarding tunnel.
  • Steps 401-415 are the handover preparation phase, and the following steps are the handover execution phase.
  • Step 416 The MME sends a Handover Command to the 4G RAN node, which includes the temporary forwarding tunnel and bearer information.
  • Step 417 The 4G RAN (eNB) sends a Handover Command to the UE, where the wireless information of the target 5G RAN is included;
  • Step 418 The UE accesses the target 5G RAN node according to the received 5G RAN radio information, and sends a Handover Confirm to the 5G RAN node.
  • the downlink data arrives at the 4G RAN node, it reaches the UE through the forwarding tunnel through the S-GW, the PGW-U/UPF, the vUPF, and the 5G RAN node;
  • Step 419 The 5G RAN node sends Handover Notify to the AMF.
  • Step 420 The AMF sends a Forward Relocation Complete Notification message to the MME to confirm that the handover is completed.
  • Step 421 The AMF sends a Handover Complete message to the SMF/PGW-C.
  • the message is first sent to the vSMF. .
  • Step 422 The SMF/PGW-C updates the UPF/PGW-U with the tunnel information of the vUPF. At this time, the UPF/PGW-U sends the downlink data to the target side (vUPF).
  • Step 423 The SMF/PGW-C sends a Handover Complete Ack to the AMF.
  • the subsequent steps further include the UE initiating a registration process on the 5G network, and the MME releases the 4G network resource.
  • the above process is a process of switching a PDN connection to a 5G PDU session.
  • the process is similar, the main difference is:
  • Step 403 it is required to send a PDU session handover request to the SMF/PGW-C of each PDN connection;
  • Step 408 after receiving all the responses, initiating step 409;
  • Step 411 it is required to send a Modify PDU session request to the SMF/PGW-C of each PDN connection;
  • Step 412 After receiving all the responses, send a message of step 414 to the MME.
  • step 421 Handover Complete needs to be sent to each SMF/PGW-C.
  • the AMF receives the handover request from the MME from the MME, and the AMF is a network element that is not related to the session management function, and needs to query the SMF/PGW-C for the session information in the 5G system, and wait until all responses are received. Reserve resources to the 5G RAN node.
  • the above switching process has a big problem.
  • AMF is visiting the network
  • SMF/PGW-C is in the home network
  • the media path of the 5G RAN node-vUPF-UPF/PGW-U is established in advance on the target 5G network. If the handover fails, a large signaling waste is caused, and these resources need additional Signaling is released.
  • Embodiments of the present disclosure provide a handover processing method, apparatus, and system, and storage medium of a network system, to at least solve the above problems.
  • a handover processing method of a network system including:
  • the authentication management function AMF entity receives a forwarding reset request sent by the 4G network system to the 5G network system, where the forwarding reset request includes: 4G session information;
  • the AMF selects a session management function SMF and sends a packet data unit PDU session request to the selected SMF, where the PDU session request includes: the 4G session information, the PDU session request is used to indicate the SMF to the location
  • the AMF returns the 5G session information corresponding to the 4G session information.
  • a handover processing method of a network system including:
  • the first session management function SMF receives the PDU session request sent by the authentication management function AMF, where the PDU session request includes: the 4G session information;
  • the first SMF processes the 5G session information obtained by the 4G session information by at least:
  • a handover processing apparatus of a network system which is applied to an authentication management function AMF entity, and includes:
  • a first receiving module configured to receive a forwarding reset request of the 4G network system to the 5G network system, where the forwarding reset request includes: 4G session information;
  • a selection module configured to select a session management function SMF, and send a packet data unit PDU session request to the selected SMF, where the PDU session request includes: the 4G session information, the PDU session request is used to indicate the SMF Returning, to the AMF, the 5G session information corresponding to the 4G session information.
  • a handover processing apparatus for a network system which is applied to a session management function SMF, including:
  • a third receiving module configured to receive a PDU session request sent by the authentication management function AMF, where the PDU session request includes: the 4G session information;
  • a processing module configured to process the 5G session information obtained by using the 4G session information by:
  • a handover processing system for a network system including:
  • the authentication management function AMF entity is configured to receive a forwarding reset request of the 4G network system to the 5G network system, select a session management function SMF, and send a packet data unit PDU session request to the selected SMF, where the forwarding reset request includes : 4G session information, the PDU session request includes: the 4G session information;
  • the SMF is configured to return, to the AMF, 5G session information corresponding to the 4G session information.
  • a storage medium comprising a stored program, wherein the program is executed to perform a handover processing method of the network system according to any of the above.
  • a processor for running a program, wherein the program is executed to perform a handover processing method of the network system according to any one of the above.
  • the authentication management function AMF entity receives a forwarding reset request from the 4G network system to the 5G network system, the AMF selects a session management function SMF, and transmits a packet data unit PDU session request to the selected SMF, wherein the forwarding reset The request includes: 4G session information, where the PDU session request includes: the 4G session information, where the PDU session request is used to instruct the SMF to return the 5G session information corresponding to the 4G session information to the AMF, using the foregoing technology.
  • the solution solves the problem that the terminal fails to switch from the 4G network system to the 5G network system due to the large delay, and the 5G RAN node-vUPF-UPF/PGW-U is established in advance on the target 5G network due to the use of a lot of signaling.
  • the media path if the handover fails, will cause a great problem of signaling waste, thereby simplifying the handover process of the terminal from the 4G network system to the 5G network system.
  • Figure 1 is a diagram of an EPC architecture
  • Figure 2 is a NextGen system architecture diagram
  • FIG. 3 is a schematic diagram of a 4G network system and a 5G network system switching architecture
  • Figure 4 is a flow chart of switching from a 4G network system to a 5G network system.
  • FIG. 5 is a flowchart of a handover processing method of a network system according to an embodiment of the present disclosure
  • FIG. 6 is a structural block diagram of a handover processing apparatus of a network system according to an embodiment of the present disclosure
  • FIG. 7 is an optional structural block diagram of a handover processing apparatus of a network system according to an embodiment of the present disclosure
  • FIG. 8 is another flowchart of a handover processing method of a network system according to an embodiment of the present disclosure.
  • FIG. 9 is another structural block diagram of a handover processing apparatus of a network system according to an embodiment of the present disclosure.
  • FIG. 10 is a structural block diagram of a handover processing system of a network system according to an embodiment of the present disclosure.
  • FIG. 11 is a flowchart showing an implementation in which UPF relocation does not occur according to a preferred embodiment of the present disclosure
  • FIG. 13 is a schematic diagram of an embodiment of establishing a target side media surface according to a preferred embodiment of the present disclosure
  • FIG. 14 is a flowchart of an implementation of dynamically obtaining 5G session information by a vSMF in a preferred embodiment of the present disclosure
  • 15 is a flowchart of SMF/PGW-C initiating a Qos flow modification after a handover is completed, according to a preferred embodiment of the present disclosure
  • FIG. 16 is a flowchart of an implementation of acquiring 5G session information and reallocating a forwarding plane according to a preferred embodiment of the present disclosure.
  • FIG. 5 is a flowchart of a handover processing method of a network system according to an embodiment of the present disclosure. As shown in FIG. 5, the flow includes the following steps:
  • the AMF entity receives a forwarding reset request from the 4G network system to the 5G network system, where the forwarding reset request includes: 4G session information; that is, the reset request carries 4G session information, and the 4G session information may include The indication information established on the 4G network, so that the network element of the 5G network can determine information such as the correspondence relationship of the session in the 5G network according to the 4G session information.
  • Step S104 the AMF selects a session management function SMF, and sends a packet data unit PDU session request to the selected SMF, where the PDU session request includes: the 4G session information, where the PDU session request is used to instruct the SMF to return to the AMF. 5G session information corresponding to the above 4G session information.
  • the AMF entity receives a forwarding reset request from the 4G network system to the 5G network system, the AMF selects the session management function SMF, and transmits a packet data unit PDU session request to the selected SMF, wherein the forwarding reset The request includes: 4G session information, where the PDU session request includes: the foregoing 4G session information, where the PDU session request is used to instruct the SMF to return the 5G session information corresponding to the 4G session information to the AMF, and the related technical solution is used to solve the related technology.
  • the terminal fails to switch from the 4G network system to the 5G network system due to the large delay, and the media path of the 5G RAN node-vUPF-UPF/PGW-U is established in advance on the target 5G network due to the use of a lot of signaling, if the handover is performed Failure will cause a large problem of signaling waste, which simplifies the switching process of the terminal from the 4G network system to the 5G network system.
  • the SMF in the embodiment of the present disclosure may include, but is not limited to, SMF-T; SMF-f; a combination of SMF and PGW-C.
  • the method further includes:
  • the AMF receives the foregoing 5G session information obtained by processing the foregoing 4G session information by the SMF returned by the SMF; and/or the AMF reserves the resources required for the handover to the base station of the 5G network system, and notifies the 4G network system that the required resources for the handover have been The reservation was successful.
  • the AMF receives a handover notification sent by the base station of the 5G network system, and requests to establish the 5G network system.
  • the AMF requests to establish the base station and the base station of the 5G network system after receiving the 5G session information.
  • the channel of the user plane function entity wherein the user plane function entity refers to a combination function of the user plane function entity UPF and PGW-U, or a user plane function entity controlled by the SMF and PGW-C function.
  • the SMF includes: a first SMF (which can be understood as SMF-T), a second SMF (which can be understood as an entity in which SMF and PGW-C are combined), and a third SMF (which can be understood as SMF). And an entity that is associated with the PGW-C, the AMF receiving the SMF returned by the SMF to process the 5G session information obtained by the 4G session information at least:
  • the second SMF sends the 5G session information to the first SMF, where the first SMF receives the handover request sent by the AMF, Feeding the 5G session information to the AMF;
  • the third SMF sends the 5G session information to the first SMF, where the first SMF feeds back to the AMF after receiving the session request sent by the AMF (the handover request is also a session request)
  • the 5G session information in the 4G network system, the first SMF and the S-GW are co-located network elements.
  • the AMF receives the 4G system handover request, and the handover request includes 4G session information (and may also include the S-GW, PGW-C address).
  • the AMF selects a forwarding SMF-F to send a handover request.
  • SMF-F (corresponding to the second SMF of the above embodiment) returns corresponding session information in the 5G system, which may include temporary forwarding tunnel information;
  • the AMF After receiving the session information, the AMF notifies the 4G network after the resource is reserved for the target 5G RAN node;
  • the 5G RAN node After receiving the handover of the UE, the 5G RAN node initiates a path switch request to the AMF;
  • the AMF uses the session information in the handover request to establish a media plane channel of the target 5G RAN node and the UPF/PGW-U.
  • the method for the SMF-F to obtain the corresponding session information in the 5G system includes:
  • the SMF-F After receiving the handover request, the SMF-F locally derives the session information in the 5G system according to the session information of the 4G; or
  • the S-GW and the vSMF are a set of network elements.
  • the SMF/PGW-C sends the corresponding 5G system session information to the vSMF through the interface between the SMF and the vSMF.
  • the AMF selects the vSMF with the same S-GW address to send the handover request; or
  • the SMF selects a vSMF in the 5G, and dynamically sends the corresponding 5G system session information to the vSMF.
  • the AMF selects the vSMF to send a handover request.
  • SMF/PGW-C and AMF need to use the same rules to ensure that the same vSMF is selected.
  • a specific selection rule such as using the same rule to map the IP address of the UE or the IMSI of the UE to a vSMF.
  • the vSMF provides the 5G session information to the SMF/PGW-C.
  • the SMF-PGW-C finds that the session information mapping is incorrect, the SMF/PGW-C initiates the QoS flow modification process to complete the system switching. process.
  • a software product stored in a storage medium (eg, 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 above-described methods of various embodiments of the present disclosure.
  • the storage medium can be a non-transitory storage medium.
  • a switching processing device of the network system is further provided, and the device is used to implement the foregoing 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. 6 is a structural block diagram of a handover processing apparatus of a network system according to an embodiment of the present disclosure. As shown in FIG. 6, the method includes:
  • the first receiving module 60 is configured to receive a forwarding reset request of the 4G network system to the 5G network system, where the forwarding reset request includes: 4G session information;
  • the selecting module 62 is configured to select a session management function SMF and send a packet data unit PDU session request to the selected SMF, where the PDU session request includes: the 4G session information, where the PDU session request is used to indicate the SMF direction
  • the AMF returns the 5G session information corresponding to the 4G session information.
  • the AMF entity receives a forwarding reset request from the 4G network system to the 5G network system, the AMF selects the session management function SMF, and sends a packet data unit PDU session request to the selected SMF, wherein the forwarding is heavy
  • the request includes: 4G session information
  • the PDU session request includes: the 4G session information, where the PDU session request is used to instruct the SMF to return the 5G session information corresponding to the 4G session information to the AMF, and the related technical solution is used to solve the related problem.
  • the media path of the 5G RAN node-vUPF-UPF/PGW-U is established in advance on the target 5G network, if If the handover fails, it will cause a great problem of signaling waste, which simplifies the handover process of the terminal from the 4G network system to the 5G network system.
  • FIG. 7 is an optional structural block diagram of a handover processing apparatus of a network system according to an embodiment of the present disclosure. As shown in FIG. 7, the apparatus further includes:
  • the second receiving module 64 is further configured to receive the foregoing 5G session information obtained by processing the foregoing 4G session information by the SMF returned by the SMF; and/or
  • the reservation module 66 is configured to reserve resources required for handover to the base station of the foregoing 5G network system
  • the notification module 68 is configured to notify that the resources required for the handover of the 4G network system have been reserved successfully.
  • the second receiving module 64 is further configured to receive a handover notification sent by the base station of the 5G network system, and, under the trigger of the handover notification, establish a base station of the 5G network system according to the received 5G session information.
  • a channel of the user plane function entity wherein the user plane function entity refers to a combination function of a user plane function entity UPF and a PGW-U, or a user plane function entity controlled by a SMF and a PGW-C function; or
  • the establishing module 70 is configured to directly establish, according to the received 5G session information, a channel of the base station of the 5G network system and the user plane functional entity according to the received 5G session information, where the user plane function entity It refers to the combination function of the user plane function entity UPF and PGW-U, or the user plane function entity controlled by the SMF and PGW-C function.
  • FIG. 8 is another flowchart of a handover processing method of a network system according to an embodiment of the present disclosure. As shown in FIG. 8, the method includes:
  • Step S202 the SMF receives the PDU session request sent by the authentication management function AMF, where the PDU session request includes: the 4G session information;
  • Step S204 The SMF processes the 5G session information obtained by the 4G session information by using at least:
  • the SMF receives the PDU session request sent by the authentication management function AMF, and the SMF processes the 5G session information obtained by the 4G session information by using the foregoing technical solution, and solves the related art.
  • the delay of the terminal caused by the delay from the 4G network system to the 5G network system fails, and because of the use of a lot of signaling, the media path of the 5G RAN node-vUPF-UPF/PGW-U is established in advance on the target 5G network. If the handover fails, This causes a large problem of signaling waste, which simplifies the handover process of the terminal from the 4G network system to the 5G network system.
  • the 5G session information is sent to the first SMF, where the first SMF feeds back the 5G session information to the AMF after receiving the session request sent by the AMF.
  • the first SMF and the S-GW in the 4G network system are co-located network elements.
  • a switching processing device of the network system is further provided, and the device is used to implement the foregoing 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. 9 is another structural block diagram of a handover processing apparatus of a network system according to an embodiment of the present disclosure. As shown in FIG. 9, the method includes:
  • the third receiving module 90 is configured to receive a PDU session request sent by the authentication management function AMF, where the PDU session request includes: the 4G session information;
  • the processing module 92 is configured to process the 5G session information obtained by using the 4G session information at least:
  • the SMF receives the PDU session request sent by the authentication management function AMF, and the SMF processes the 5G session information obtained by the 4G session information by using the foregoing technical solution to solve the related technology.
  • the terminal fails to switch from the 4G network system to the 5G network system due to the large delay, and the media path of the 5G RAN node-vUPF-UPF/PGW-U is established in advance on the target 5G network due to the use of a lot of signaling, if the handover is performed Failure will cause a large problem of signaling waste, which simplifies the switching process of the terminal from the 4G network system to the 5G network system.
  • the processing module 92 is further configured to send the 5G session information to the first SMF, where the first SMF feeds back the 5G session information to the AMF after receiving the session request sent by the AMF.
  • the first SMF and the S-GW in the 4G network system are co-located network elements.
  • FIG. 10 is a structural block diagram of a switching processing system of a network system according to an embodiment of the present disclosure. As shown in FIG. 10, the method includes:
  • the authentication management function AMF entity 80 is configured to receive a forwarding reset request of the 4G network system to the 5G network system, select a session management function SMF, and send a packet data unit PDU session request to the selected SMF, where the forwarding reset request includes : 4G session information, the foregoing PDU session request includes: the foregoing 4G session information;
  • the SMF 82 is configured to return the 5G session information corresponding to the 4G session information to the AMF.
  • the AMF entity receives a forwarding reset request from the 4G network system to the 5G network system, the AMF selects the session management function SMF, and transmits a packet data unit PDU session request to the selected SMF.
  • the above-mentioned forwarding reset request includes: 4G session information
  • the PDU session request includes: the 4G session information
  • the PDU session request is used to instruct the SMF to return the 5G session information corresponding to the 4G session information to the AMF
  • the technical solution solves the problem that the terminal fails to switch from the 4G network system to the 5G network system due to the large delay, and the 5G RAN node-vUPF-UPF/PGW is established in advance on the target 5G network due to the use of a lot of signaling. If the U media path fails, it will cause a large problem of signaling waste, which simplifies the handover process of the terminal from the 4G network system to the 5G network system.
  • the AMF is further configured to receive the foregoing 5G session information obtained by processing, by the SMF, the SMF to process the 4G session information, and/or to reserve a resource required for the handover to the base station of the 5G network system, and The resources required to notify the above 4G network system handover have been reserved successfully.
  • the base station of the 5G network system receives the handover confirmation information sent by the terminal.
  • the AMF is further configured to receive a handover notification sent by the base station of the 5G network system, requesting to establish a channel of the base station of the 5G network system and the user plane functional entity, where the user plane function entity refers to a user plane function
  • the user plane function entity refers to a user plane function
  • the AMF is further configured to, after receiving the 5G session information, request to establish a base station and the user of the 5G network system.
  • the channel of the functional entity, wherein the user plane function entity refers to the combination function of the user plane function entity UPF and PGW-U, or the user plane function entity controlled by the SMF and PGW-C function.
  • the SMF includes: a first SMF, a second SMF, and a third SMF,
  • the first SMF is further configured to locally derive the 5G session information according to the 4G session information; and/or
  • the second SMF is further configured to send the 5G session information to the first SMF, where the first SMF feeds back the 5G to the AMF after receiving the session request sent by the AMF Session information.
  • the third SMF is further configured to send the 5G session information to the first SMF, where the first SMF, after receiving the session request sent by the AMF, to the AMF The 5G session information is fed back.
  • the first SMF and the S-GW are combined network elements.
  • a processor configured to run a program, wherein the program is executed to perform a handover processing method of the network system according to any one of the above.
  • FIG. 11 is a flowchart of an implementation in which UPF relocation does not occur according to an embodiment of the present disclosure. As shown in FIG. 11, the method includes the following steps:
  • Step S500 the terminal UE has established a PDN connection in the 4G system, and may also establish a dedicated bearer;
  • Step S501 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 S502 The MME selects a target AMF according to the handover request, and sends a Forward Relocation Request to the AMF, where the GW carries the 4G session information, including the PGW-C/SMF, the S-GW address, the bearer information, and the like.
  • the AMF selects an SMF-F and sends a PDU Session Request to it, which carries 4G session information.
  • the SMF-F may be a specific SMF that is visited, or an SMF that is associated with the S-GW.
  • Step S504 the SMF-F establishes an N4 session to the UPF-F, and obtains N3 uplink tunnel information.
  • the SMF-F returns a PDU Session Response to the AMF, which carries the corresponding 5G PDU session information and the uplink tunnel information of the N3.
  • the information is 5G session information generated by the SMF-F using 4G session information mapping, or 5G session information obtained by using FIG. 13;
  • Step S505 The AMF sends a Handover Request request to the 5G RAN node, where 5G PDU session information, and N3 uplink tunnel information.
  • Step S506 The 5G RAN node sends a Handover Request Acknowledge (ACK) to the AMF, where the N3 downlink tunnel information is included.
  • ACK Handover Request Acknowledge
  • Step S507 the AMF sends a PDU Session Modify Request to the SMF-F to request to establish a downlink forwarding tunnel.
  • Step S508 the SMF-F returns a response to the AMF, and includes forwarding tunnel information.
  • Step S509 The AMF sends a forward relocation response (Forward Relocation Response) to the MME, which includes information such as Serving GW change indication, EPS Bearer Setup List, TEIDs, and the like;
  • a forward relocation response (Forward Relocation Response) to the MME, which includes information such as Serving GW change indication, EPS Bearer Setup List, TEIDs, and the like;
  • Step S510 The MME sends a Create Indirect Data Forwarding Tunnel Request to the S-GW to request to establish a temporary forwarding tunnel.
  • Step S511 The MME sends a handover command (Handover Command) to the 4G RAN node, which includes the temporary forwarding tunnel and bearer information.
  • a handover command (Handover Command)
  • Step S512 The 4G RAN (eNB) sends a Handover Command to the UE, where the wireless information of the target 5G RAN is included;
  • Step S513 The UE accesses the target 5G RAN node according to the received 5G RAN radio information, and sends a Handover Confirm to the 5G RAN node.
  • the downlink data arrives at the 4G RAN node, it reaches the UE through the forwarding tunnel through the S-GW, the UPF-F, and the 5G RAN node;
  • Step S514 may be in the same message as step S507, and step S515 may be sent after step S508.
  • Step S514 may also be an independent message, which is sent after step S509.
  • This embodiment adopts the mode of a in FIG. 13 , and may also adopt the manner of b in FIG. 13 to trigger the establishment of the media plane after receiving the Handover notify of step S520. The embodiment using the b mode in FIG. 13 will not be described again.
  • Step S514 AMF sends a PDU to the SMF-F.
  • Step S515 The SMF-F interacts with the UPF-F to obtain the N9 downlink tunnel information, and then sends a PDU session handover request to the SMF/PGW-C, where the N9 downlink tunnel information is carried.
  • Step S516 If the PCC is deployed, the SMF may initiate a PDU-CAN Session Modification to the PCF/PCRF to obtain a 5GS PCC rule for switching to the 5G PDU session.
  • Step S517 The SMF/PGW-C initiates an N4 session modification to the UPF/PGW-U, notifies the N9 downlink tunnel information, and obtains the N9 uplink tunnel information.
  • Step S518 The SMF/PGW-C sends a PDU Session Handover Response to the SMF-F, where the N9 uplink tunnel information is carried.
  • Step S519 The SMF-F notifies the UPF-F of the N9 uplink tunnel information, and sends a PDU Session Handover Response to the AMF.
  • Step S520 The 5G RAN node sends Handover Notify to the AMF.
  • Step S521 The AMF sends a Forward Relocation Complete Notification message to the MME to confirm that the handover is completed.
  • Step S522 The AMF sends a Handover Complete message to the SMF/PGW-C through the SMF-F.
  • Step S523 The SMF/PGW-C notifies the UPF/PGW-U. At this time, the UPF/PGW-U sends the downlink data to the target side.
  • Step S524 The SMF/PGW-C sends a Handover Complete Ack to the AMF.
  • Step S525 Path switching confirmation.
  • the subsequent steps further include the UE initiating a registration process on the 5G network, and the MME releases the 4G network resource.
  • the above process is a process of switching a PDN connection to a 5G PDU session.
  • the process is similar, the main difference is:
  • Step S503 the PDU session handover request needs to be sent to the SMF-F selected for each PDN connection; these SMF-Fs may be the same entity.
  • Step S504 after receiving all the responses, step S505 is initiated;
  • Step S507 it is necessary to send a Modify PDU session request to the SMF-F for each PDN connection;
  • Step S508 after receiving all the responses, sending a message of step S509 to the MME;
  • step S51 a PDU Session Handover Request needs to be initiated for each PDN connection.
  • step S522 a Handover Complete message needs to be sent to each SMF/PGW-C.
  • FIG. 12 is a flowchart showing an implementation of UPF relocation, as shown in FIG. 12, in accordance with a preferred embodiment of the present disclosure.
  • Step S600 the terminal UE has established a PDN connection in the 4G system, and may also establish a dedicated bearer;
  • Step S601 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 S602 The MME selects a target AMF according to the handover request, and sends a Forward Relocation Request to the AMF, where the GW carries the 4G session information, including the PGW-C/SMF, the S-GW address, the bearer information, and the like.
  • the AMF selects an SMF-F and sends a PDU Session Request to it, which carries 4G session information.
  • the SMF-F may be a specific SMF that is visited, or an SMF that is associated with the S-GW.
  • Step S604 the SMF-F establishes an N4 session to the UPF-F, and obtains N3 uplink tunnel information.
  • the SMF-F returns a PDU Session Response to the AMF, which carries the corresponding 5G PDU session information and the uplink tunnel information of the N3.
  • the information is 5G session information generated by the SMF-F using 4G session information mapping, or 5G session information obtained by using FIG. 13;
  • Step S605 The AMF sends a Handover Request request to the 5G RAN node, where 5G PDU session information, and N3 uplink tunnel information.
  • Step S606 The 5G RAN node sends a Handover Request Acknowledge to the AMF, where the N3 downlink tunnel information is included.
  • Step S607 the AMF sends a PDU Session modify Request to the SMF-F, requesting to establish a downlink forwarding tunnel.
  • Step S608 the SMF-F returns a response to the AMF, and includes forwarding tunnel information.
  • Step S609 The AMF sends a Forward Relocation Response to the MME, which includes information such as Serving GW change indication, EPS Bearer Setup List, TEIDs, and the like;
  • Step S610 The MME sends a Create Indirect Data Forwarding Tunnel Request to the S-GW to request to establish a temporary forwarding tunnel.
  • Step S611 The MME sends a Handover Command to the 4G RAN node, which includes the temporary forwarding tunnel and bearer information.
  • Step S612 The 4G RAN (eNB) sends a Handover Command to the UE, where the wireless information of the target 5G RAN is included;
  • Step S613 The UE accesses the target 5G RAN node according to the received 5G RAN radio information, and sends a Handover Confirm to the 5G RAN node.
  • the downlink data arrives at the 4G RAN node, it reaches the UE through the forwarding tunnel through the S-GW, the UPF-F, and the 5G RAN node;
  • the SMF-F only implements temporary downlink data forwarding.
  • the purpose of steps S614-S619 and S621 is to establish a 5G RAN, UPF-F to PGW-U/UPF media plane channel.
  • Step S614 can be sent after step S609.
  • the method of a in FIG. 13 is adopted.
  • the manner of b in FIG. 13 may be adopted.
  • step S621 is sent after step S625.
  • the embodiment using the b mode in Fig. 13 will not be described again.
  • Step S614 The AMF selects the t-SMF, and sends a PDU session handover request to the t-SMF, where the N3 downlink tunnel information is carried;
  • Step S615 The t-SMF and the t-UPF interact to obtain the N3 uplink tunnel information, the N9 downlink tunnel information, and then send the PDU session handover request to the SMF/PGW-C, where the N9 downlink tunnel information is carried.
  • Step S616 If the PCC is deployed, the SMF may initiate a PDU-CAN Session Modification to the PCF/PCRF to obtain a 5GS PCC rule for switching to the 5G PDU session.
  • Step S617 The SMF/PGW-C initiates an N4 session modification to the UPF/PGW-U, notifies the N9 downlink tunnel information, and obtains the N9 uplink tunnel information.
  • Step S618 The SMF/PGW-C sends a PDU Session Handover Response to the t-SMF, where the N9 uplink tunnel information is carried.
  • Step S619 The t-SMF notifies the t9 UPF of the N9 uplink tunnel information, and sends a PDU Session Handover Response to the AMF, where the N3 uplink tunnel information is carried.
  • Step S620 The 5G RAN node sends Handover Notify to the AMF.
  • Step S621 The AMF notifies the 5G RAN node of the N3 uplink tunnel information
  • Step S622 The AMF sends a Forward Relocation Complete Notification message to the MME, and confirms that the handover is completed.
  • Step S623 The AMF sends a Handover Complete message to the SMF/PGW-C through the t-SMF.
  • Step S624 The SMF/PGW-C notifies the UPF/PGW-U. At this time, the UPF/PGW-U sends the downlink data to the t-UPF.
  • Step S625 The SMF/PGW-C sends a Handover Complete Ack to the AMF.
  • the subsequent steps further include the UE initiating a registration process on the 5G network, the MME releasing 4G network resources, and the AMF releasing the SMF-F.
  • the above process is a process of switching a PDN connection to a 5G PDU session.
  • the process is similar, the main difference is:
  • Step S603 the PDU session handover request needs to be sent to the SMF-F selected for each PDN connection; these SMF-Fs may be the same entity.
  • Step S604 after receiving all the responses, step S605 is initiated;
  • Step S607 it is necessary to send a Modify PDU session request to the SMF-F for each PDN connection;
  • Step S608 after receiving all the responses, sending a message of step S609 to the MME;
  • step S614 a PDU Session Handover Request needs to be initiated for each PDN connection.
  • Step S621 The AMF notifies the N3 tunnel uplink information corresponding to all PDU sessions of the 5G RAN node;
  • step S623 a Handover Complete message needs to be sent to each SMF/PGW-C.
  • FIG. 13 is a schematic diagram of an embodiment of establishing a target side media surface according to a preferred embodiment of the present disclosure, as shown in FIG. 13;
  • Mode a is the embodiment of Figures 11 and 12.
  • the media plane channel on the target side has been completely established.
  • the corresponding steps in FIG. 11 and FIG. 12 are 701 to 711;
  • step S720 is the same as before steps S520, S620 in Figs. 11 and 12 except that there are no steps S514-S519, and S614-S619; corresponding to steps 720 to 728 in Fig. 13.
  • Step S721 The 5G RAN node sends Handover Notify to the AMF;
  • Step S722 The AMF selects the t-SMF, and sends a PDU session handover request to the t-SMF, where the N3 downlink tunnel information is carried;
  • Step S723 The t-SMF and the t-UPF interact to obtain the N3 uplink tunnel information, the N9 downlink tunnel information, and then send the PDU session handover request to the SMF/PGW-C, where the N9 downlink tunnel information is carried.
  • Step S724 If the PCC is deployed, the SMF may initiate a PDU-CAN Session Modification to the PCF/PCRF to obtain a 5GS PCC rule for switching to the 5G PDU session.
  • Step S725 The SMF/PGW-C initiates an N4 session modification to the UPF/PGW-U, notifying the N9 downlink tunnel information, and obtaining the N9 uplink tunnel information; the downlink media is sent to the t-UPF;
  • Step S726 The SMF/PGW-C sends a PDU Session Handover Response to the t-SMF, where the N9 uplink tunnel information is carried.
  • Step S727 The t-SMF notifies the t9 UPF of the N9 uplink tunnel information, and sends a PDU Session Handover Response to the AMF, where the N3 uplink tunnel information is carried.
  • Step S728 The AMF notifies the 5G RAN node of the N3 uplink tunnel information
  • the SMF-F After receiving the handover request, the SMF-F locally derives the session information in the 5G system according to the session information of the 4G. Or dynamically obtained from SMF/PGW-C.
  • S-GW and vSMF are a set of network elements.
  • the SMF/PGW-C sends the corresponding 5G system session information to the vSMF through the interface between the SMF and the vSMF.
  • the AMF selects the vSMF with the same S-GW address to send the handover request; or
  • the SMF selects a vSMF in the 5G, and dynamically sends the corresponding 5G system session information to the vSMF.
  • the AMF selects the vSMF to send a handover request.
  • SMF/PGW-C and AMF need to use the same rules to ensure that the same vSMF is selected.
  • a specific selection rule such as using the same rule to map the IP address of the UE or the IMSI of the UE to a vSMF.
  • Step S800 the terminal UE has established a PDN connection in the 4G system, that is, the PDN connection establishment as shown in FIG. 14;
  • Step S801 the SMF/PGW-C sends the 5G session information to the selected Vsmf;
  • Step S802 the terminal UE generates, modify, and delete a dedicated bearer in the 4G system.
  • Step S803 the SMF/PGW-C sends the 5G session information to the selected vSMF;
  • Step S804 the S-GW changes
  • Step S805 the SMF/PGW-C sends the 5G session information to the target vSMF, or
  • Step S805a the source vSMF sends the 5G session information to the target vSMF;
  • the vSMF and the S-GW may be a combined network element or a specific vSMF.
  • the vSMF and the S-GW may be a combined network element or a specific vSMF.
  • it is a specific vSMF, there are no steps S805 and S805a.
  • the SMF-F may locally map the 4G session information to the 5G session information, but if the mapping has an error, the SMF/SMF/PGW-C initiates a Qos flow modification process to correct after the handover is completed.
  • step S914 is a flowchart of the SMF/PGW-C initiating the modification of the Qos stream after the handover is completed according to a preferred embodiment of the present disclosure. Taking the above-mentioned FIG. 14 as an example, steps 901 to 913 before step S914 are the same as the corresponding functional steps. The differences are as follows:
  • Step S906 the SMF/PGW-C finds that the 5G session information is incorrect.
  • Step S915 After the handover is completed, the SMF/SMF/PGW-C initiates a Qos flow modification to the t-SMF/t-UPF; the t-SMF interacts with the t-UPF to complete the modification. The T-SMF sends a Qos stream modification to the AMF;
  • Step S916 The AMF initiates a session modification to the 5G RAN.
  • Step S917 The 5G RAN may initiate reconfiguration of the RRC
  • Step S918 The 5G RAN node sends a response to the AMF.
  • Step S919 The AMF sends a session modification response to the SMF/PGW-C.
  • FIG. 16 is a flowchart of an implementation of acquiring 5G session information and reallocating a forwarding plane according to a preferred embodiment of the present disclosure, including:
  • Step S1600 the terminal UE has established a PDN connection in the 4G system, and may also establish a dedicated bearer;
  • Step S1601 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 S1602 The MME selects a target AMF according to the handover request, and sends a Forward Relocation Request to the AMF, where the GW carries the 4G session information, including the PGW-C/SMF, the S-GW address, the bearer information, and the like.
  • the AMF selects an SMF-T and sends a PDU Session Request to it, which carries 4G session information.
  • the SMF-T may be a specific SMF that is visited, or an SMF that is associated with the S-GW.
  • step S1604 the SMF-T establishes an N4 session to the UPF-T to obtain N3 uplink tunnel information.
  • the SMF-F returns a PDU Session Response to the AMF, which carries the corresponding 5G PDU session information and the uplink tunnel information of the N3.
  • the information is 5G session information generated by the SMF-T using 4G session information mapping, or 5G session information obtained by using FIG. 14;
  • Step S1605 The AMF sends a Handover Request request to the 5G RAN node, where 5G PDU session information, and N3 uplink tunnel information.
  • Step S1606 The 5G RAN node sends a Handover Request Acknowledge to the AMF, where the N3 downlink tunnel information is included.
  • step S1607 the AMF establishes a temporary forwarding tunnel.
  • the AMF selects a forwarding SMF-F and sends a PDU Session forward tunnel Request to request to establish a downlink forwarding tunnel.
  • Step S1608 The SMF-F controls the UPF-F to generate downlink forwarding information, and returns a response to the AMF, including forwarding tunnel information.
  • Step S1609 The AMF sends a Forward Relocation Response to the MME, which includes information such as Serving GW change indication, EPS Bearer Setup List, TEIDs, and the like;
  • Step S1610 The MME sends a Create Indirect Data Forwarding Tunnel Request to the S-GW to request to establish a temporary forwarding tunnel.
  • Step S1611 The MME sends a Handover Command to the 4G RAN node, which includes the temporary forwarding tunnel and bearer information.
  • Step S1612 The 4G RAN (eNB) sends a Handover Command to the UE, where the wireless information of the target 5G RAN is included;
  • Step S1613 The UE accesses the target 5G RAN node according to the received 5G RAN radio information, and sends a Handover Confirm to the 5G RAN node.
  • the downlink data arrives at the 4G RAN node, it reaches the UE through the forwarding tunnel through the S-GW, the UPF-F, and the 5G RAN node;
  • steps S1614-S1619 only implements temporary downlink data forwarding.
  • the purpose of steps S1614-S1619 is to establish a 5G RAN, UPF-t to PGW-U/UPF media plane channel.
  • Step S1614 may be sent after step S1609.
  • the mode of a in FIG. 13 is adopted.
  • the manner of b in FIG. 13 may be adopted.
  • the establishment of the media plane channel of UPF-t to PGW-U/UPF is completed. .
  • the embodiment using the b mode in FIG. 13 will not be described again.
  • Step S1614 AMF sends a PDU session modify request to the t-SMF;
  • Step S1615 The t-SMF interacts with the t-UPF to obtain the N9 downlink tunnel information, and then sends a PDU session request to the SMF/PGW-C, where the N9 downlink tunnel information is carried.
  • Step S1616 If the PCC is deployed, the SMF may initiate a PDU-CAN Session Modification to the PCF/PCRF to obtain a 5GS PCC rule for switching to the 5G PDU session.
  • Step S1617 The SMF/PGW-C initiates an N4 session modification to the UPF/PGW-U, notifies the N9 downlink tunnel information, and obtains the N9 uplink tunnel information.
  • Step S1618 The SMF/PGW-C sends a PDU Session Response to the t-SMF, where the N9 uplink tunnel information is carried.
  • Step S1619 The t-SMF notifies the t9 UPF of the N9 uplink tunnel information, and sends a PDU Session Handover Response to the AMF.
  • Step S1620 The 5G RAN node sends Handover Notify to the AMF.
  • Step S1621 The AMF sends a Forward Relocation Complete Notification message to the MME to confirm that the handover is completed.
  • Step S1622 The AMF sends a Handover Complete message to the SMF/PGW-C through the t-SMF.
  • Step S1623 The SMF/PGW-C notifies the UPF/PGW-U. At this time, the UPF/PGW-U sends the downlink data to the t-UPF.
  • Step S1624 The SMF/PGW-C sends a Handover Complete Ack to the AMF.
  • the subsequent steps further include the UE initiating a registration process on the 5G network, the MME releasing 4G network resources, and the AMF releasing the SMF-F.
  • the above process is a process of switching a PDN connection to a 5G PDU session.
  • the process is similar, the main difference is:
  • Step S1603 the PDU session request needs to be sent to the SMF-T selected for each PDN connection; these SMF-Ts may be the same entity.
  • Step S1604 after receiving all the responses, step S1605 is initiated;
  • Step S1607 it is necessary to send a PDU session forward tunnel request to the SMF-F for each PDN connection;
  • Step S1608 after receiving all the responses, sending a message of step S1609 to the MME;
  • step S1614 the PDU Session modification Request needs to be initiated for each PDN connection.
  • step S1622 a Handover Complete message needs to be sent to each SMF/PGW-C.
  • Embodiments of the present disclosure also provide a storage medium including a stored program, wherein the program described above executes the method of any of the above.
  • the storage medium can be selected as a non-transitory storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • the authentication management function AMF entity receives a forwarding reset request from the 4G network system to the 5G network system, where the forwarding reset request includes: 4G session information;
  • the AMF selects a session management function SMF, and sends a packet data unit PDU session request to the selected SMF, where the PDU session request includes: the 4G session information, the PDU session request is used to indicate the SMF Returning, to the AMF, the 5G session information corresponding to the 4G session information.
  • the storage medium is further arranged to store program code for performing the following steps:
  • the AMF receives the 5G session information obtained by the SMF returned by the SMF to process the 4G session information; and/or
  • the AMF reserves the resources required for the handover to the base station of the 5G network system, and notifies the 4G network system that the resources required for the handover have been reserved successfully.
  • the storage medium is further arranged to store program code for performing the following steps:
  • the base station of the 5G network system After receiving the handover confirmation information sent by the terminal, the base station of the 5G network system receives a handover notification sent by the base station of the 5G network system, and requests to establish a base station and the user plane function of the 5G network system.
  • a physical channel wherein the user plane function refers to a combination function of the user plane function entities UPF and PGW-U, or a user plane function entity controlled by the SMF and PGW-C function; and/or
  • the AMF is further configured to, after receiving the 5G session information, request to establish a base station and the user of the 5G network system.
  • the channel of the functional entity which refers to the combination function of the user plane function entity UPF and PGW-U, or the user plane function entity controlled by the SMF and PGW-C function
  • the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), and a Random Access Memory (RAM).
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • modules or steps of the present disclosure 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. As such, the disclosure is not limited to any specific combination of hardware and software.
  • the 4G session information is carried by the forwarding reset request, so that the 4G session information is not obtained through dedicated signaling when the handover fails.

Landscapes

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

Abstract

本公开提供了一种网络系统的切换处理方法、装置及系统、存储介质，其中，所述方法包括：AMF实体接收4G网络系统向5G网络系统的转发重置请求，AMF选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，所述转发重置请求包括：4G会话信息，所述PDU会话请求包括：所述4G会话信息，所述PDU会话请求用于指示所述SMF向所述AMF返回所述4G会话信息对应的5G会话信息。

Description

网络系统的切换处理方法、装置及系统、存储介质
相关申请的交叉引用
本申请基于申请号为201710466076.7、申请日为2017年06月19日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本公开涉及通信领域，尤其涉及一种网络系统的切换处理方法、装置及系统、存储介质。
背景技术
第三代合作伙伴(3rd Generation Partnership Project，简称为3GPP)从R8开始制定第四代长期演进(Long Term Evolution，简称为LTE)移动通信系统中。其网络架构如图1所示，架构中各网元的功能如下：
终端(User Equipment，简称为UE)，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，分组数据网(Packet Data Network，简称为PDN)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：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：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地址，网络触发的承载建立、修改和删除，还具有QoS控制计费等功能，是用户在3GPP系统内的锚点，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系统(NextGen System)，下一代通讯系统能够支持演进的移动宽带(Evolved Mobile Broadband，简称为eMBB)、超大连接机器通讯(Massive Machine Type Communication，简称为mMTC)、超可靠机器通讯(Ultra Reliable Machine Type Communication，简称为uMTC)三种业务类型，这三种业务类型具有不同的网络特性。图2是下一代移动通信网络架构示意图，其中各网元的功能如下：
UE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，gNB)，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。
会话控制面功能(Session Management Function，简称为SMF)：和终端交互，主要负责处理用户(Packet Data Unit，简称为PDU)会话建立、修改和删除请求，选择用户面功能(User Plane function，简称为UPF)；建立UE到UPF之间的用户面连接；和策略控制功能(Policy Control  Function，简称为PCF)一起确定会话的会话质量(Quality of Service，简称为QoS)参数等功能。
接入与移动性控制功能(Access and Mobility control Function，简称为AMCF)：是核心网内的公共控制面功能。一个用户只有一个AMCF，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；当用户发起分组数据单元(Packet Data Unit，简称为PDU)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(Non Access Stratum，简称为NAS)信令；转发基站和SMF之间的接入层(Access Stratum，简称为AS)信令。
UPF：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。
PCF：所提供的功能和4G时代的PCRF非常类似。
统一数据管理功能(Unified Data Management，简称为UDM)：存储了用户的签约数据，其和4G时代的HSS非常类似。
NextGen System(5G)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系统中，随着用户的移动，移除了5G系统的覆盖范围，必须要解决如何无缝的切换到4G系统中，否则会话会产生中断。
图3是一个满足4G<-->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。在认证管理功能(Authentication Management Function，简称为AMF)和MME之间，增加Nx接口，在该接口上发送跨系统间切换请求。这样UE在LTE和5G之间切换时，能够保证无缝切换。
当4G系统中，UE和网络使用bearer(承载概念)，每个承载代表了对应的业务流(Service flows)，及其QoS参数。在5G系统中，则采用QoS flow的概念，每个QoS flow包括了对应的QoS profile和分组过滤器(packet filter)。
图4是现有技术中4G向5G切换的流程图，主要包括以下步骤：
步骤400，终端UE在4G系统中已经建立了PDN连接(connection)，可能还建立了专用承载；
步骤401，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402，MME根据切换请求，选择目标AMF，向AMF发送Forward Relocation Request，其中携带了PGW-C/SMF，S-GW地址；
步骤403，AMF根据其中的SMF/PGW-C地址，向其发起PDU Session Handover Request，在漫游场景，或者部署原因，该请求先发给vSMF；
步骤404，vSMF向SMF/PGW-C转发PDU会话切换请求(Session Handover Request)；
步骤405：如果部署了PCC，SMF可以向PCF/PCRF发起PDU-CAN Session Modification,来获得切换到5G后的PDU session的5GS PCC规则。此时PCF/PCRF并不对该PDU session直接应用5GS PCC规则。
步骤406：TSMF/PGW-C向UPF/PGW-U发起N4会话修改(session modification)，获得上行隧道信息；
步骤407：SMF/PGW-C发送PDU会话切换响应(Session Handover Response)给AMF，其中携带了授权的5G Qos规则，EPS承载建立列表(bearer Setup List)，UPF/PGW-U的上行隧道信息，当步骤403中存在vSMF时，该消息先发送给vSMF。
步骤408：vSMF选择一个vUPF，发起N4会话建立(Session Establishment)过程。vSMF把UPF/PGW-U的上行隧道信息提供给vUPF，vUPF生成v-CN隧道信息(N3上行隧道，N9下行隧道)，并发给vSMF。vSMF转发PDU Session Handover Response给AMF，其中携带了授权的5G Qos规则，EPS bearer Setup List，vUPF的的上行隧道信息。
步骤409：AMF发送Handover Request请求给5G RAN节点，其中至少包含了PDU session ID，对应的QoS Profile，上行隧道信息。
步骤410：5G RAN节点发送Handover Request Acknowledge给AMF， 其中包含了N3下行隧道信息；
步骤411：AMF向SMF/PGW-C发送修改PDU会话请求(Modify PDU Session Request)，其中包含了下行N3隧道信息。当有vSMF存在的时候，该消息先发送给vSMF，vSMF将N3下行隧道信息替换为步骤408分配的N9下行隧道信息，发给SMF/PGW-C。
步骤412：SMF/PGW-C向AMF发送修改PDU响应(Modify PDU Response)。当存在vMSF时，该消息先发给vSMF，vSMF再发送给AMF。
步骤413：SMF/PGW-C向UPF/PGW-U请求建立临时转发隧道；
步骤414：AMF发送前向分配响应(Forward Relocation Response)给MME，其中包含了服务网关改变指示Serving GW change indication,EPS Bearer Setup List,TEIDs等信息；
步骤415：MME向S-GW发送创建间接数据转发隧道请求(Create Indirect Data Forwarding Tunnel Request)，请求建立临时转发隧道。
步骤401-415，是切换准备阶段，下面步骤是切换执行阶段。
步骤416：MME发送切换指令(Handover Command)给4G RAN节点.其中包含了临时转发隧道和承载信息
步骤417：4G RAN(eNB)发送Handover Command给UE，其中包含了目标5G RAN的无线信息；
步骤418：UE根据收到的5G RAN无线信息，接入目标5G RAN节点，发送Handover Confirm给5G RAN节点。
此时，下行数据到达4G RAN节点后，通过转发隧道经S-GW，PGW-U/UPF，vUPF，5G RAN节点，到达UE；
步骤419：5G RAN节点发送Handover Notify给AMF
步骤420：AMF发送前向分配完成通知(Forward Relocation Complete Notification)消息给MME，确认切换完成。
步骤421：AMF向SMF/PGW-C发送切换完成(Handover Complete)消息。当有vSMF存在的时候，该消息先发送给vSMF。.
步骤422：SMF/PGW-C用vUPF的隧道信息更新UPF/PGW-U.此时UPF/PGW-U把下行数据发向目标侧(vUPF)。
步骤423：SMF/PGW-C发送Handover Complete Ack给AMF。
随后的步骤还包括UE在5G网络发起注册流程，MME释放4G网络资源。
上述流程是把一个PDN connection切换到5G PDU session的流程。当有多个PDN connection时，流程是类似的，主要区别是：
步骤403，需要向每个PDN connection的SMF/PGW-C发送PDU session handover request；
步骤408，需要收到所有的响应后，发起步骤409；
步骤411，需要向每个PDN connection的SMF/PGW-C发送Modify PDU session request；
步骤412，需要收到所有响应后，向MME发送步骤414消息；
步骤421，需要向每个SMF/PGW-C发送Handover Complete。
上述流程中，AMF从MME收到的是4G系统的切换请求，AMF是和会话管理功能无关的网元，其需要向SMF/PGW-C询问5G系统中的会话信息，等到收到所有响应后向5G RAN节点预留资源。
然而，上述切换流程存在很大的问题。当一些特定场景(例如Home routed场景)下，AMF在拜访网络，SMF/PGW-C在归属网络，会有很大的延迟。这样容易导致切换失败。此外由于使用很多信令，提前在目标5G网络建立了5G RAN节点-vUPF-UPF/PGW-U的媒体路径，如果切换失败，会造成了很大的信令浪费，而且这些资源还需要额外的信令释放掉。
发明内容
本公开实施例提供了一种网络系统的切换处理方法、装置及系统、存储介质，以至少解决上述问题。
根据本公开的一个实施例，提供了一种网络系统的切换处理方法，包括：
认证管理功能AMF实体接收4G网络系统向5G网络系统发送的转发重置请求，其中，所述转发重置请求包括：4G会话信息；
所述AMF选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，所述PDU会话请求包括：所述4G会话信息，所述PDU会话请求用于指示所述SMF向所述AMF返回所述4G会话信息对应的5G会话信息。
根据本公开的另一个实施例，还提供了一种网络系统的切换处理方法，包括：
第一会话管理功能SMF接收认证管理功能AMF发送的PDU会话请求，其中，所述PDU会话请求包括：所述4G会话信息；
所述第一SMF至少通过以下方式处理所述4G会话信息得到的所述5G会话信息：
根据收到的所述4G会话信息本地推导得到所述5G会话信息；或
接收所述第二SMF发送的5G会话信息，在收到所述AMF发送的会话请求后，向所述AMF反馈所述5G会话信息。
根据本公开的另一个实施例，还提供了一种网络系统的切换处理装置，应用于认证管理功能AMF实体中，包括：
第一接收模块，用于接收4G网络系统向5G网络系统的转发重置请求，其中，所述转发重置请求包括：4G会话信息；
选择模块，用于选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，所述PDU会话请求包括：所述4G会话信息，所述PDU会话请求用于指示所述SMF向所述AMF返回所述4G会话信息对应的5G会话信息。
根据本公开的另一个实施例，还提供了一种网络系统的切换处理装置，应用于会话管理功能SMF，包括：
第三接收模块，用于接收认证管理功能AMF发送的PDU会话请求，其中，所述PDU会话请求包括：所述4G会话信息；
处理模块，用于至少通过以下方式处理所述4G会话信息得到的所述5G 会话信息：
根据收到的所述4G会话信息本地推导得到所述5G会话信息；或
接收所述第二SMF发送的5G会话信息，在收到所述AMF发送的会话请求后，向所述AMF反馈所述5G会话信息。
根据本公开的另一个实施例，还提供了一种网络系统的切换处理系统，包括：
认证管理功能AMF实体，用于接收4G网络系统向5G网络系统的转发重置请求，选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，所述转发重置请求包括：4G会话信息，所述PDU会话请求包括：所述4G会话信息；
所述SMF，用于向所述AMF返回所述4G会话信息对应的5G会话信息。
根据本公开的另一个实施例，还提供了一种存储介质，所述存储介质包括存储的程序，其中，所述程序运行时执行以上任一项所述的网络系统的切换处理方法。
根据本公开的另一个实施例，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以上任一项所述的网络系统的切换处理方法。
通过本公开，认证管理功能AMF实体接收4G网络系统向5G网络系统的转发重置请求，AMF选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，所述转发重置请求包括：4G会话信息，所述PDU会话请求包括：所述4G会话信息，所述PDU会话请求用于指示所述SMF向所述AMF返回所述4G会话信息对应的5G会话信息，采用上述技术方案，解决了相关技术中，由于延迟大导致的终端从4G网络系统到5G网络系统切换失败，以及由于使用很多信令，提前在目标5G网络建立了5G RAN节点-vUPF-UPF/PGW-U的媒体路径，如果切换失败，会造成了很大的信令浪费的问题，进而简化了终端从4G网络系统到5G网络系统的切换过程。
附图说明
此处所说明的附图用来提供对本公开的可选地理解，构成本申请的一部分，本公开的示意性实施例及其说明用于解释本公开，并不构成对本公开的不当限定。在附图中：
图1是一种EPC架构图；
图2是一种NextGen system架构图
图3是一种4G网络系统和5G网络系统切换架构图；
图4是一种4G网络系统向5G网络系统的切换流程图
图5是根据本公开实施例的网络系统的切换处理方法的流程图；
图6是根据本公开实施例的网络系统的切换处理装置的结构框图；
图7是根据本公开实施例的网络系统的切换处理装置的一个可选的结构框图；
图8为根据本公开实施例的种网络系统的切换处理方法的另一流程图；
图9是根据本公开实施例的网络系统的切换处理装置的另一结构框图；
图10为根据本公开实施例的网络系统的切换处理系统的结构框图；
图11为根据本公开优选实施例的不发生UPF relocation的实施流程图；
图12是根据本公开优选实施例的发生UPF relocation的实施流程图；
图13是本公开优选实施例的建立目标侧媒体面的实施方式示意图；
图14是根据本公开优选实施例中的vSMF动态获得5G会话信息的实施流程图；
图15是根据本公开优选实施例的切换完成后，SMF/PGW-C发起Qos流修改的流程图；
图16是根据本公开优选实施例的获取5G会话信息，再分配转发面的实施流程图。
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公开。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，本公开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。
在本实施例中提供了一种网络系统的切换处理方法，图5是根据本公开实施例的网络系统的切换处理方法的流程图，如图5所示，该流程包括如下步骤：
步骤S102，AMF实体接收4G网络系统向5G网络系统的转发重置请求，其中，上述转发重置请求包括：4G会话信息；即该重置请求中携带有4G会话信息，该4G会话信息可包括：在4G网络建立的指示信息，如此，5G网络的网元可以根据该4G会话信息确定出于5G网络中的会话的对应关系等信息。
步骤S104，上述AMF选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，上述PDU会话请求包括：上述4G会话信息，上述PDU会话请求用于指示上述SMF向上述AMF返回上述4G会话信息对应的5G会话信息。
通过本公开的上述各个步骤，AMF实体接收4G网络系统向5G网络系统的转发重置请求，AMF选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，上述转发重置请求包括：4G会话信息，上述PDU会话请求包括：上述4G会话信息，上述PDU会话请求用于指示上述SMF向上述AMF返回上述4G会话信息对应的5G会话信息，采用上述技术方案，解决了相关技术中，由于延迟大导致的终端从4G网络系统到5G网络系统切换失败，以及由于使用很多信令，提前在目标5G网络建立了5G RAN节点-vUPF-UPF/PGW-U的媒体路径，如果切换失败，会造成了很大的信令浪费的问题，进而简化了终端从4G网络系统到5G网络系统的切换过程。
需要说明的是，本公开实施例中的SMF可以包括但不限于：SMF-T； SMF-f；SMF和PGW-C合设在一起的合设体。
可选地，AMF向选择的SMF发送分组数据单元PDU会话请求之后，上述方法还包括：
AMF接收SMF返回的上述SMF处理上述4G会话信息得到的上述5G会话信息；和/或AMF向上述5G网络系统的基站预留切换所需的资源，并通知上述4G网络系统切换所需的资源已经预留成功。
在本公开实施例中，在所述5G网络系统的基站接收到所述终端发送的切换确认信息后，所述AMF接收所述5G网络系统的基站发送的切换通知，请求建立所述5G网络系统的基站与所述用户面功能实体的通道，其中，所述用户面功能实体是指用户面功能实体UPF和PGW-U的合设功能，或，SMF与PGW-C合设功能控制的用户面功能实体；和/或在所述5G网络系统的基站接收到所述终端发送的切换确认信息之前，所述AMF在收到所述5G会话信息后，请求建立所述5G网络系统的基站与所述用户面功能实体的通道，其中，所述用户面功能实体是指用户面功能实体UPF和PGW-U的合设功能，或，SMF与PGW-C合设功能控制的用户面功能实体。
可选地，所述SMF包括：第一SMF(可以理解为SMF-T)，第二SMF((可以理解为是SMF和PGW-C合设的实体)，第三SMF(可以理解为是SMF和PGW-C合设的实体)，所述AMF接收SMF返回的所述SMF至少通过以下方式处理所述4G会话信息得到的所述5G会话信息：
所述第一SMF根据所述4G会话信息本地推导得到所述5G会话信息；或
在所述4G网络系统建立PDN连接过程中，所述第二SMF将所述5G会话信息发送至所述第一SMF，其中，所述第一SMF在接收到所述AMF发送的切换请求后，向所述AMF反馈所述5G会话信息；或
第三SMF将所述5G会话信息发送至所述第一SMF，其中，所述第一SMF在接收到所述AMF发送的会话请求(切换请求也是一种会话请求)后，向所述AMF反馈所述5G会话信息，在所述4G网络系统中，所述第一SMF和S-GW为合设网元。
以下结合一示例对上述流程进行简要的解释说明：
在4G向5G系统中的切换过程中，AMF收到4G系统切换请求，切换请求中包含了4G会话信息(还可能包含了S-GW，PGW-C地址)。AMF选择一个转发SMF-F，发送切换请求。SMF-F(相当于上述实施例的第二SMF)返回在5G系统中对应的会话信息，其中可能包含了临时转发隧道信息；
AMF收到会话信息后，向目标5G RAN节点预留资源完成后，通知4G网络；
在收到UE的切换完成后，5G RAN节点向AMF发起路径切换请求；
AMF利用切换请求中的会话信息，建立目标5G RAN节点和UPF/PGW-U的媒体面通道。
可选地，SMF-F获得在5G系统中对应的会话信息的方法包括：
SMF-F收到切换请求后，根据4G的会话信息，本地推导出5G系统中的会话信息；或
在本实施例的架构中，S-GW和vSMF是一个合设网元。在4G系统建立PDN connection过程中，建立专载过程中，SMF/PGW-C将对应的5G系统会话信息，通过SMF和vSMF之间的接口发送给vSMF。AMF收到切换请求后，选择和S-GW地址相同的vSMF发送切换请求；或
UE在4G系统建立PDN connection后，SMF在5G选择一个vSMF，动态的将对应的5G系统会话信息，发送给vSMF。AMF收到切换请求后，选择该vSMF发送切换请求。SMF/PGW-C和AMF需要使用相同的规则，以保证选择相同的vSMF。具体的选择规则，如使用相同规则把UE的IP地址，或者UE的IMSI映射到一个vSMF上。
可选地，路径切换过程中，vSMF将5G会话信息提供给SMF/PGW-C，当SMF-PGW-C发现会话信息映射有误，SMF/PGW-C发起QoS流修改过程，完成系统的切换过程。
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，本公开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)执行本公开各个实施例上述的方法。该存储介质可为非瞬间存储介质。
在本实施例中还提供了一种网络系统的切换处理装置，该装置用于实现上述实施例，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6是根据本公开实施例的网络系统的切换处理装置的结构框图，如图6所示，包括：
1)第一接收模块60，配置为接收4G网络系统向5G网络系统的转发重置请求，其中，上述转发重置请求包括：4G会话信息；
2)选择模块62，配置为选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，上述PDU会话请求包括：上述4G会话信息，上述PDU会话请求用于指示上述SMF向上述AMF返回上述4G会话信息对应的5G会话信息。
通过本公开的上述模块的作用，AMF实体接收4G网络系统向5G网络系统的转发重置请求，AMF选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，上述转发重置请求包括：4G会话信息，上述PDU会话请求包括：上述4G会话信息，上述PDU会话请求用于指示上述SMF向上述AMF返回上述4G会话信息对应的5G会话信息，采用上述技术方案，解决了相关技术中，由于延迟大导致的终端从4G网络系统到5G网络系统切换失败，以及由于使用很多信令，提前在目标5G网络建立了5G RAN节点-vUPF-UPF/PGW-U的媒体路径，如果切换失败，会造成了很大的信令浪费的问题，进而简化了终端从4G网络系统到5G网络系统的切换过程。
图7是根据本公开实施例的网络系统的切换处理装置的一个可选的结构框图，如图7所示，上述装置还包括：
第二接收模块64，还配置为接收SMF返回的上述SMF处理上述4G会话信息得到的上述5G会话信息；和/或
预留模块66，配置为向上述5G网络系统的基站预留切换所需的资源；
通知模块68，配置为通知上述4G网络系统切换所需的资源已经预留成功。
可选地，第二接收模块64，还配置为接收上述5G网络系统的基站发送的切换通知，并在上述切换通知的触发下，根据接收到的上述5G会话信息建立上述5G网络系统的基站与所述用户面功能实体的通道，其中，所述用户面功能实体是指用户面功能实体UPF和PGW-U的合设功能，或，SMF与PGW-C合设功能控制的用户面功能实体；或
建立模块70，配置为直接根据接收到的上述5G会话信息，并根据接收到的上述5G会话信息建立上述5G网络系统的基站与所述用户面功能实体的通道，其中，所述用户面功能实体是指用户面功能实体UPF和PGW-U的合设功能，或，SMF与PGW-C合设功能控制的用户面功能实体。
根据本公开的另一个实施例，图8为根据本公开实施例的种网络系统的切换处理方法的另一流程图，如图8所示，包括：
步骤S202，SMF接收认证管理功能AMF发送的PDU会话请求，其中，所述PDU会话请求包括：所述4G会话信息；
步骤S204，SMF至少通过以下方式处理所述4G会话信息得到的所述5G会话信息：
根据收到的所述4G会话信息本地推导得到所述5G会话信息；或
接收所述第二SMF发送的5G会话信息，在收到所述AMF发送的会话请求后，向所述AMF反馈所述5G会话信息。
通过上述各个步骤，SMF接收认证管理功能AMF发送的PDU会话请求，所述SMF至少通过以上方式处理所述4G会话信息得到的所述5G会话信息，采用上述技术方案，解决了相关技术中，由于延迟大导致的终端从4G网络系统到5G网络系统切换失败，以及由于使用很多信令，提前在目标5G网 络建立了5G RAN节点-vUPF-UPF/PGW-U的媒体路径，如果切换失败，会造成了很大的信令浪费的问题，进而简化了终端从4G网络系统到5G网络系统的切换过程。
在本公开实施例中，将所述5G会话信息发送至所述第一SMF，其中，所述第一SMF在接收到所述AMF发送的会话请求后，向所述AMF反馈所述5G会话信息，所述第一SMF和所述4G网络系统中的S-GW为合设网元。
在本实施例中还提供了一种网络系统的切换处理装置，该装置用于实现上述实施例，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9是根据本公开实施例的网络系统的切换处理装置的另一结构框图，如图9所示，包括：
第三接收模块90，配置为接收认证管理功能AMF发送的PDU会话请求，其中，所述PDU会话请求包括：所述4G会话信息；
处理模块92，配置为至少通过以下方式处理所述4G会话信息得到的所述5G会话信息：
根据收到的所述4G会话信息本地推导得到所述5G会话信息；或
接收所述第二SMF发送的5G会话信息，在收到所述AMF发送的会话请求后，向所述AMF反馈所述5G会话信息。通过上述各个模块的综合作用，SMF接收认证管理功能AMF发送的PDU会话请求，所述SMF至少通过以上方式处理所述4G会话信息得到的所述5G会话信息，采用上述技术方案，解决了相关技术中，由于延迟大导致的终端从4G网络系统到5G网络系统切换失败，以及由于使用很多信令，提前在目标5G网络建立了5G RAN节点-vUPF-UPF/PGW-U的媒体路径，如果切换失败，会造成了很大的信令浪费的问题，进而简化了终端从4G网络系统到5G网络系统的切换过程。
处理模块92，还用于将所述5G会话信息发送至所述第一SMF，其中， 所述第一SMF在接收到所述AMF发送的会话请求后，向所述AMF反馈所述5G会话信息，所述第一SMF和所述4G网络系统中的S-GW为合设网元。
在本公开实施例中，还提供了一种网络系统的切换处理系统，图10为根据本公开实施例的网络系统的切换处理系统的结构框图，如图10所示，包括：
认证管理功能AMF实体80，配置为接收4G网络系统向5G网络系统的转发重置请求，选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，上述转发重置请求包括：4G会话信息，上述PDU会话请求包括：上述4G会话信息；
上述SMF 82，配置为向上述AMF返回上述4G会话信息对应的5G会话信息。
通过本公开实施例的网络系统的切换处理系统的交互，AMF实体接收4G网络系统向5G网络系统的转发重置请求，AMF选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，上述转发重置请求包括：4G会话信息，上述PDU会话请求包括：上述4G会话信息，上述PDU会话请求用于指示上述SMF向上述AMF返回上述4G会话信息对应的5G会话信息，采用上述技术方案，解决了相关技术中，由于延迟大导致的终端从4G网络系统到5G网络系统切换失败，以及由于使用很多信令，提前在目标5G网络建立了5G RAN节点-vUPF-UPF/PGW-U的媒体路径，如果切换失败，会造成了很大的信令浪费的问题，进而简化了终端从4G网络系统到5G网络系统的切换过程。
可选地，上述AMF，还配置为接收SMF返回的上述SMF处理上述4G会话信息得到的上述5G会话信息；和/或还用于向上述5G网络系统的基站预留切换所需的资源，并通知上述4G网络系统切换所需的资源已经预留成功。
可选地，在所述5G网络系统的基站接收到所述终端发送的切换确认信息后，
所述AMF，还配置为接收所述5G网络系统的基站发送的切换通知，请 求建立所述5G网络系统的基站与所述用户面功能实体的通道，其中，用户面功能实体是指用户面功能实体UPF和PGW-U的合设功能，或，SMF与PGW-C合设功能控制的用户面功能实体；和/或
在所述5G网络系统的基站接收到所述终端发送的切换确认信息之前，所述AMF，还用于在收到所述5G会话信息后，请求建立所述5G网络系统的基站与所述用户面功能实体的通道，其中，用户面功能实体是指用户面功能实体UPF和PGW-U的合设功能，或，SMF与PGW-C合设功能控制的用户面功能实体。
可选地，所述SMF包括：第一SMF，第二SMF，第三SMF，
所述第一SMF，还用于根据所述4G会话信息本地推导得到所述5G会话信息；和/或
所述第二SMF，还配置为将所述5G会话信息发送至所述第一SMF，其中，所述第一SMF在接收到所述AMF发送的会话请求后，向所述AMF反馈所述5G会话信息。
可选地，所述第三SMF，还配置为将所述5G会话信息发送至所述第一SMF，其中，所述第一SMF在接收到所述AMF发送的会话请求后，向所述AMF反馈所述5G会话信息，在所述4G网络系统中，所述第一SMF和S-GW为合设网元。
在本公开实施例中，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以上任一项所述的网络系统的切换处理方法。
下面结合优选实施例进行说明，以下优选实施例结合了上述实施例及其实施例。
图11为根据本公开实施例的不发生UPF relocation的实施流程图，如图11所示，包括以下步骤：
步骤S500，终端UE在4G系统中已经建立了PDN connection，可能还建立了专用承载；
步骤S501，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S502，MME根据切换请求，选择目标AMF，向AMF发送Forward Relocation Request，其中携带了4G会话信息，包括PGW-C/SMF，S-GW地址，承载信息等；
步骤S503，AMF选择一个SMF-F，向其发起PDU Session Request，其中携带了4G会话信息。该SMF-F可以是拜访地特定的SMF，或者是与S-GW合设的SMF。
步骤S504，SMF-F向UPF-F建立N4会话，获得N3上行隧道信息。SMF-F向AMF返回PDU Session Response，其中携带了对应的5G PDU session信息，以及N3的上行隧道信息。该信息是SMF-F利用4G会话信息映射生成的5G会话信息，或者是利用图13获得的5G会话信息；
步骤S505：AMF发送切换请求(Handover Request)请求给5G RAN节点，其中5G PDU session信息，以及N3上行隧道信息。
步骤S506：5G RAN节点发送切换请求ACK(Handover Request Acknowledge)给AMF，其中包含了N3下行隧道信息；
步骤S507，AMF向SMF-F发送PDU会话修改请求(PDU Session modify Request)，请求建立下行转发隧道；
步骤S508，SMF-F向AMF返回响应，包含了转发隧道信息；
步骤S509：AMF发送前向分配响应(Forward Relocation Response)给MME，其中包含了Serving GW change indication,EPS Bearer Setup List,TEIDs等信息；
步骤S510：MME向S-GW发送建立间接数据转发隧道请求(Create Indirect Data Forwarding Tunnel Request)，请求建立临时转发隧道。
步骤S511：MME发送切换命令(Handover Command)给4G RAN节点.其中包含了临时转发隧道和承载信息
步骤S512：4G RAN(eNB)发送Handover Command给UE，其中包含了目标5G RAN的无线信息；
步骤S513：UE根据收到的5G RAN无线信息，接入目标5G RAN节点，发送Handover Confirm给5G RAN节点。
此时，下行数据到达4G RAN节点后，通过转发隧道经S-GW，UPF-F，5G RAN节点，到达UE；
在步骤S508之后，当UE切换到5G系统后，其上行数据可以到达UPF-F，步骤S514-S519的目的就是建立UPF-F到PGW-U/UPF的媒体面通道。步骤S514可以和步骤S507在同一个消息中，步骤S515在步骤S508后既可以发送。步骤S514也可以是一个独立消息，在步骤S509后发送。本实施例采用的是图13中a的方式，此外也可以采用图13中b的方式，在收到步骤S520的Handover notify后，触发媒体面的建立。采用图13中b方式的实施例不再赘述。
步骤S514：AMF向SMF-F发送PDU session handover request
步骤S515：SMF-F和UPF-F交互，获得N9下行隧道信息，然后向SMF/PGW-C发送PDU session handover request，其中携带了N9下行隧道信息。
步骤S516：如果部署了PCC，SMF可以向PCF/PCRF发起PDU-CAN Session Modification,来获得切换到5G后的PDU session的5GS PCC规则。
步骤S517：SMF/PGW-C向UPF/PGW-U发起N4 session modification，通知其N9下行隧道信息，并获得N9上行隧道信息；
步骤S518：SMF/PGW-C发送PDU Session Handover Response给SMF-F，其中携带了N9上行隧道信息；
步骤S519：SMF-F将N9上行隧道信息通知UPF-F，向AMF发送PDU Session Handover Response；
步骤S520：5G RAN节点发送Handover Notify给AMF
步骤S521：AMF发送Forward Relocation Complete Notification消息给MME，确认切换完成。
步骤S522：AMF通过SMF-F向SMF/PGW-C发送Handover Complete消息。
步骤S523：SMF/PGW-C通知UPF/PGW-U.此时UPF/PGW-U把下行数据发向目标侧。
步骤S524：SMF/PGW-C发送Handover Complete Ack给AMF。
步骤S525：路径切换确认。
随后的步骤还包括UE在5G网络发起注册流程，MME释放4G网络资源。
上述流程是把一个PDN connection切换到5G PDU session的流程。当有多个PDN connection时，流程是类似的，主要区别是：
步骤S503，需要向为每个PDN connection选择的SMF-F发送PDU session handover request；这些SMF-F可能是同一个实体
步骤S504，需要收到所有的响应后，发起步骤S505；
步骤S507，需要为每个PDN connection，向SMF-F发送Modify PDU session request；
步骤S508，需要收到所有响应后，向MME发送步骤S509消息；
步骤S514，需要为每个PDN connection，向发起PDU Session Handover Request。
步骤S522，需要向每个SMF/PGW-C，发送Handover Complete消息。
图12是根据本公开优选实施例的发生UPF relocation的实施流程图，如图12所示。
步骤S600，终端UE在4G系统中已经建立了PDN connection，可能还建立了专用承载；
步骤S601，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S602，MME根据切换请求，选择目标AMF，向AMF发送Forward Relocation Request，其中携带了4G会话信息，包括PGW-C/SMF，S-GW地址，承载信息等；
步骤S603，AMF选择一个SMF-F，向其发起PDU Session Request，其中携带了4G会话信息。该SMF-F可以是拜访地特定的SMF，或者是与S-GW合设的SMF。
步骤S604，SMF-F向UPF-F建立N4会话，获得N3上行隧道信息。SMF-F 向AMF返回PDU Session Response，其中携带了对应的5G PDU session信息，以及N3的上行隧道信息。该信息是SMF-F利用4G会话信息映射生成的5G会话信息，或者是利用图13获得的5G会话信息；
步骤S605：AMF发送Handover Request请求给5G RAN节点，其中5G PDU session信息，以及N3上行隧道信息。
步骤S606：5G RAN节点发送Handover Request Acknowledge给AMF，其中包含了N3下行隧道信息；
步骤S607，AMF向SMF-F发送PDU Session modify Request，请求建立下行转发隧道；
步骤S608，SMF-F向AMF返回响应，包含了转发隧道信息；
步骤S609：AMF发送Forward Relocation Response给MME，其中包含了Serving GW change indication,EPS Bearer Setup List,TEIDs等信息；
步骤S610：MME向S-GW发送Create Indirect Data Forwarding Tunnel Request，请求建立临时转发隧道。
步骤S611：MME发送Handover Command给4G RAN节点.其中包含了临时转发隧道和承载信息
步骤S612：4G RAN(eNB)发送Handover Command给UE，其中包含了目标5G RAN的无线信息；
步骤S613：UE根据收到的5G RAN无线信息，接入目标5G RAN节点，发送Handover Confirm给5G RAN节点。
此时，下行数据到达4G RAN节点后，通过转发隧道经S-GW，UPF-F，5G RAN节点，到达UE；
SMF-F仅仅实现了临时下行数据转发，步骤S614-S619，以及S621的目的就是建立5G RAN，UPF-F到PGW-U/UPF的媒体面通道。步骤S614可以在步骤S609后发送。本实施例采用的是图13中a的方式，此外也可以采用图13中b的方式，在收到步骤S620的Handover notify后，触发媒体面的建立，此时步骤S621在步骤S625后发送。采用图13中b方式的实施 例不再赘述。
步骤S614：AMF选择t-SMF，向t-SMF发送PDU session handover request，其中携带了N3下行隧道信息；
步骤S615：t-SMF和t-UPF交互，获得N3上行隧道信息，N9下行隧道信息，然后向SMF/PGW-C发送PDU session handover request，其中携带了N9下行隧道信息。
步骤S616：如果部署了PCC，SMF可以向PCF/PCRF发起PDU-CAN Session Modification,来获得切换到5G后的PDU session的5GS PCC规则。
步骤S617：SMF/PGW-C向UPF/PGW-U发起N4 session modification，通知其N9下行隧道信息，并获得N9上行隧道信息；
步骤S618：SMF/PGW-C发送PDU Session Handover Response给t-SMF，其中携带了N9上行隧道信息；
步骤S619：t-SMF将N9上行隧道信息通知t-UPF，向AMF发送PDU Session Handover Response，其中携带N3上行隧道信息；
步骤S620：5G RAN节点发送Handover Notify给AMF
步骤S621：AMF向5G RAN节点通知N3上行隧道信息；
步骤S622：AMF发送Forward Relocation Complete Notification消息给MME，确认切换完成。
步骤S623：AMF通过t-SMF向SMF/PGW-C发送Handover Complete消息。
步骤S624：SMF/PGW-C通知UPF/PGW-U.此时UPF/PGW-U把下行数据发向t-UPF。
步骤S625：SMF/PGW-C发送Handover Complete Ack给AMF。
随后的步骤还包括UE在5G网络发起注册流程，MME释放4G网络资源，AMF释放SMF-F。
上述流程是把一个PDN connection切换到5G PDU session的流程。当有多个PDN connection时，流程是类似的，主要区别是：
步骤S603，需要向为每个PDN connection选择的SMF-F发送PDU session handover request；这些SMF-F可能是同一个实体
步骤S604，需要收到所有的响应后，发起步骤S605；
步骤S607，需要为每个PDN connection，向SMF-F发送Modify PDU session request；
步骤S608，需要收到所有响应后，向MME发送步骤S609消息；
步骤S614，需要为每个PDN connection，向发起PDU Session Handover Request。
步骤S621：AMF要通知5G RAN节点所有PDU session对应的N3隧道上行信息；
步骤S623，需要向每个SMF/PGW-C，发送Handover Complete消息。
图13是本公开优选实施例的建立目标侧媒体面的实施方式示意图，如图13所示；
方式a，就是图11和图12的实施方式。在切换完成前，目标侧的媒体面通道已经完全建立，这里具体步骤参见图11和图12对应步骤，在图13中对应的步骤为701至711；
方式b，在收到5G RAN节点的Handover notify后，才触发建立媒体面通道。步骤S720之前的流程与图11和12中步骤S520，S620之前一样，只是没有步骤S514-S519,以及S614-S619；对应于图13中的步骤720至728。
步骤S721：5G RAN节点发送Handover Notify给AMF；
步骤S722：AMF选择t-SMF，向t-SMF发送PDU session handover request，其中携带了N3下行隧道信息；
步骤S723：t-SMF和t-UPF交互，获得N3上行隧道信息，N9下行隧道信息，然后向SMF/PGW-C发送PDU session handover request，其中携带了N9下行隧道信息。
步骤S724：如果部署了PCC，SMF可以向PCF/PCRF发起PDU-CAN Session Modification,来获得切换到5G后的PDU session的5GS PCC规则。
步骤S725：SMF/PGW-C向UPF/PGW-U发起N4 session modification，通知其N9下行隧道信息，并获得N9上行隧道信息；此时下行媒体发往t-UPF；
步骤S726：SMF/PGW-C发送PDU Session Handover Response给t-SMF，其中携带了N9上行隧道信息；
步骤S727：t-SMF将N9上行隧道信息通知t-UPF，向AMF发送PDU Session Handover Response，其中携带N3上行隧道信息；
步骤S728：AMF向5G RAN节点通知N3上行隧道信息；
SMF-F收到切换请求后，根据4G的会话信息，本地推导出5G系统中的会话信息。或者动态从SMF/PGW-C获得。
图14是根据本公开优选实施例中的vSMF动态获得5G会话信息的实施流程图。其中，S-GW和vSMF是一个合设网元。在4G系统建立PDN connection过程中，建立专载过程中，SMF/PGW-C将对应的5G系统会话信息，通过SMF和vSMF之间的接口发送给vSMF。AMF收到切换请求后，选择和S-GW地址相同的vSMF发送切换请求；或
UE在4G系统建立PDN connection后，SMF在5G选择一个vSMF，动态的将对应的5G系统会话信息，发送给vSMF。AMF收到切换请求后，选择该vSMF发送切换请求。SMF/PGW-C和AMF需要使用相同的规则，以保证选择相同的vSMF。具体的选择规则，如使用相同规则把UE的IP地址，或者UE的IMSI映射到一个vSMF上。
步骤S800，终端UE在4G系统中已经建立了PDN connection，即如图14中所示的PDN连接建立；
步骤S801，SMF/PGW-C将5G会话信息发送给选择的Vsmf；
步骤S802，终端UE在4G系统中发生专用承载的建立，修改，删除过程；
步骤S803，SMF/PGW-C将5G会话信息发送给选择的vSMF；
步骤S804，S-GW发生改变；
步骤S805，SMF/PGW-C将5G会话信息发送给目标vSMF，或者
步骤S805a，源vSMF将5G会话信息发送给目标vSMF；
这里，vSMF和S-GW可以是合设网元，也可能是某个特定的vSMF。当为某特定vSMF时，没有步骤S805和S805a。
在本公开优选实施例中，SMF-F可以本地将4G会话信息映射为5G会话信息，但是如果映射发生错误，在切换完成后，SMF/SMF/PGW-C发起Qos流修改过程来修正。
图15是根据本公开优选实施例的切换完成后，SMF/PGW-C发起Qos流修改的流程图，以上述的图14为例，步骤S914以前的步骤901至913和对应的功能步骤一样，区别如下：
步骤S906，SMF/PGW-C发现5G会话信息错误；
步骤S915：切换完成后，SMF/SMF/PGW-C向t-SMF/t-UPF发起Qos流modification；t-SMF和t-UPF交互，完成修改。T-SMF向AMF发送Qos流modification；
步骤S916：AMF向5G RAN发起会话修改；
步骤S917：5G RAN可能发起RRC的重配置；
步骤S918：5G RAN节点向AMF发送响应；
步骤S919：AMF向SMF/PGW-C发送会话修改的响应。
图16是根据本公开优选实施例的获取5G会话信息，再分配转发面的实施流程图，包括：
步骤S1600，终端UE在4G系统中已经建立了PDN connection，可能还建立了专用承载；
如图16所示，还包括：
步骤S1601，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S1602，MME根据切换请求，选择目标AMF，向AMF发送Forward Relocation Request，其中携带了4G会话信息，包括PGW-C/SMF，S-GW地址，承载信息等；
步骤S1603，AMF选择一个SMF-T，向其发起PDU Session Request，其中携带了4G会话信息。该SMF-T可以是拜访地特定的SMF，或者是与S-GW合设的SMF。
步骤S1604，SMF-T向UPF-T建立N4会话，获得N3上行隧道信息。SMF-F向AMF返回PDU Session Response，其中携带了对应的5G PDU session信息，以及N3的上行隧道信息。该信息是SMF-T利用4G会话信息映射生成的5G会话信息，或者是利用图14获得的5G会话信息；
步骤S1605：AMF发送Handover Request请求给5G RAN节点，其中5G PDU session信息，以及N3上行隧道信息。
步骤S1606：5G RAN节点发送Handover Request Acknowledge给AMF，其中包含了N3下行隧道信息；
步骤S1607，AMF建立临时转发隧道。AMF选择一个转发SMF-F，发送PDU Session forward tunnel Request，请求建立下行转发隧道；
步骤S1608，SMF-F控制UPF-F，生成下行转发信息，向AMF返回响应，包含了转发隧道信息；
步骤S1609：AMF发送Forward Relocation Response给MME，其中包含了Serving GW change indication,EPS Bearer Setup List,TEIDs等信息；
步骤S1610：MME向S-GW发送Create Indirect Data Forwarding Tunnel Request，请求建立临时转发隧道。
步骤S1611：MME发送Handover Command给4G RAN节点.其中包含了临时转发隧道和承载信息；
步骤S1612：4G RAN(eNB)发送Handover Command给UE，其中包含了目标5G RAN的无线信息；
步骤S1613：UE根据收到的5G RAN无线信息，接入目标5G RAN节点，发送Handover Confirm给5G RAN节点。
此时，下行数据到达4G RAN节点后，通过转发隧道经S-GW，UPF-F，5G RAN节点，到达UE；
SMF-F仅仅实现了临时下行数据转发，步骤S1614-S1619的目的就是建立5G RAN，UPF-t到PGW-U/UPF的媒体面通道。步骤S1614可以在步骤S1609后发送。本实施例采用的是图13中a的方式，此外也可以采用图13中b的方式，在收到步骤S1620的Handover notify后，完成UPF-t到PGW-U/UPF的媒体面通道的建立。采用图13中b方式的实施例不再赘述。
步骤S1614：AMF向t-SMF，发送PDU session modify request；
步骤S1615：t-SMF和t-UPF交互，获得N9下行隧道信息，然后向SMF/PGW-C发送PDU session request，其中携带了N9下行隧道信息。
步骤S1616：如果部署了PCC，SMF可以向PCF/PCRF发起PDU-CAN Session Modification,来获得切换到5G后的PDU session的5GS PCC规则。
步骤S1617：SMF/PGW-C向UPF/PGW-U发起N4 session modification，通知其N9下行隧道信息，并获得N9上行隧道信息；
步骤S1618：SMF/PGW-C发送PDU Session Response给t-SMF，其中携带了N9上行隧道信息；
步骤S1619：t-SMF将N9上行隧道信息通知t-UPF，向AMF发送PDU Session Handover Response；
步骤S1620：5G RAN节点发送Handover Notify给AMF；
步骤S1621：AMF发送Forward Relocation Complete Notification消息给MME，确认切换完成。
步骤S1622：AMF通过t-SMF向SMF/PGW-C发送Handover Complete消息。
步骤S1623：SMF/PGW-C通知UPF/PGW-U.此时UPF/PGW-U把下行数据发向t-UPF。
步骤S1624：SMF/PGW-C发送Handover Complete Ack给AMF。
随后的步骤还包括UE在5G网络发起注册流程，MME释放4G网络资源，AMF释放SMF-F。
上述流程是把一个PDN connection切换到5G PDU session的流程。 当有多个PDN connection时，流程是类似的，主要区别是：
步骤S1603，需要向为每个PDN connection选择的SMF-T发送PDU session request；这些SMF-T可能是同一个实体
步骤S1604，需要收到所有的响应后，发起步骤S1605；
步骤S1607，需要为每个PDN connection，向SMF-F发送PDU session forward tunnel request；
步骤S1608，需要收到所有响应后，向MME发送步骤S1609消息；
步骤S1614，需要为每个PDN connection，向发起PDU Session modify Request。
步骤S1622，需要向每个SMF/PGW-C，发送Handover Complete消息。
本公开的实施例还提供了一种存储介质，该存储介质包括存储的程序，其中，上述程序运行时执行上述任一项所述的方法。该存储介质可选为非瞬间存储介质。
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，认证管理功能AMF实体接收4G网络系统向5G网络系统的转发重置请求，其中，所述转发重置请求包括：4G会话信息；
S2，所述AMF选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，所述PDU会话请求包括：所述4G会话信息，所述PDU会话请求用于指示所述SMF向所述AMF返回所述4G会话信息对应的5G会话信息。
可选地，存储介质还被设置为存储用于执行以下步骤的程序代码：
S3，所述AMF接收SMF返回的所述SMF处理所述4G会话信息得到的所述5G会话信息；和/或
所述AMF向所述5G网络系统的基站预留切换所需的资源，并通知所述4G网络系统切换所需的资源已经预留成功。
可选地，存储介质还被设置为存储用于执行以下步骤的程序代码：
S4，在所述5G网络系统的基站接收到所述终端发送的切换确认信息后，接收所述5G网络系统的基站发送的切换通知，请求建立所述5G网络系统的基站与所述用户面功能实体的通道，其中所述用户面功能是指用户面功能实体UPF和PGW-U的合设功能，或，SMF与PGW-C合设功能控制的用户面功能实体；和/或
在所述5G网络系统的基站接收到所述终端发送的切换确认信息之前，所述AMF，还用于在收到所述5G会话信息后，请求建立所述5G网络系统的基站与所述用户面功能实体的通道，其中，是指用户面功能实体UPF和PGW-U的合设功能，或，SMF与PGW-C合设功能控制的用户面功能实体
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(Read-Only Memory，简称为ROM)、随机存取存储器(Random Access Memory，简称为RAM)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
显然，本领域的技术人员应该明白，上述的本公开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，本公开不限制于任何特定的硬件和软件结合。
以上所述仅为本公开的优选实施例而已，并不用于限制本公开，对于本领域的技术人员来说，本公开可以有各种更改和变化。凡在本公开的原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。
工业实用性
本公开实施例提供的技术方案中，若终端从4G网络系统到5G网络系统的切换，通过转发重置请求携带4G会话信息，从而不用在切换失败时通过专用的信令来获得4G会话信息，从而减少了信令开销，具有积极的工业效果，且具有实现简便的特点，可在工业上广泛推广使用。

Claims (16)

  1. 一种网络系统的切换处理方法，包括：
    认证管理功能AMF实体接收4G网络系统向5G网络系统发送的转发重置请求，其中，所述转发重置请求包括：4G会话信息；
    所述AMF选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，所述PDU会话请求包括：所述4G会话信息，所述PDU会话请求用于指示所述SMF向所述AMF返回所述4G会话信息对应的5G会话信息。
  2. 根据权利要求1所述的方法，其中，所述AMF向选择的SMF发送分组数据单元PDU会话请求之后，所述方法还包括：
    所述AMF接收SMF返回的所述SMF处理所述4G会话信息得到的所述5G会话信息；和/或
    所述AMF向所述5G网络系统的基站预留切换所需的资源，并通知所述4G网络系统切换所需的资源已经预留成功。
  3. 根据权利要求1所述的方法，其中，所述方法还包括：
    在所述5G网络系统的基站接收到所述终端发送的切换确认信息后，所述AMF接收所述5G网络系统的基站发送的切换通知并请求建立所述5G网络系统的基站与所述用户面功能实体的通道，其中，所述用户面功能实体是指用户面功能实体UPF和PGW-U的合设功能，或，SMF与PGW-C合设功能控制的用户面功能实体；
    和/或
    在所述5G网络系统的基站接收到所述终端发送的切换确认信息之前，所述AMF在收到所述5G会话信息后，请求建立所述5G网络系统的基站与所述用户面功能实体的通道，其中，所述用户面功能实体是指用户面功能实体UPF和PGW-U的合设功能，或，SMF与PGW-C 合设功能控制的用户面功能实体。
  4. 根据权利要求1所述的方法，其中，所述SMF包括：第一SMF，第二SMF，第三SMF，所述AMF接收SMF返回的所述SMF至少通过以下方式处理所述4G会话信息得到的所述5G会话信息：
    所述第一SMF根据收到的所述4G会话信息本地推导得到所述5G会话信息；或
    所述第二SMF将所述5G会话信息发送至所述第一SMF，其中，所述第一SMF在接收到所述AMF发送的会话请求后，向所述AMF反馈所述5G会话信息。
  5. 根据权利要求4所述的方法，其中，所述方法还包括：
    第三SMF将所述5G会话信息发送至所述第一SMF，其中，所述第一SMF在接收到所述AMF发送的会话请求后，向所述AMF反馈所述5G会话信息，所述第一SMF和所述4G网络系统中的S-GW为合设网元。
  6. 一种网络系统的切换处理方法，其中，包括：
    第一会话管理功能SMF接收认证管理功能AMF发送的PDU会话请求，其中，所述PDU会话请求包括：所述4G会话信息；
    所述第一SMF至少通过以下方式处理所述4G会话信息得到的所述5G会话信息：
    根据收到的所述4G会话信息本地推导得到所述5G会话信息；或
    接收所述第二SMF发送的5G会话信息，在收到所述AMF发送的会话请求后，向所述AMF反馈所述5G会话信息。
  7. 一种网络系统的切换处理装置，应用于认证管理功能AMF实体中，其中，包括：
    第一接收模块，配置为接收4G网络系统向5G网络系统的转发重 置请求，其中，所述转发重置请求包括：4G会话信息；
    选择模块，配置为选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，所述PDU会话请求包括：所述4G会话信息，所述PDU会话请求用于指示所述SMF向所述AMF返回所述4G会话信息对应的5G会话信息。
  8. 根据权利要求7所述的装置，其中，所述装置还包括：
    第二接收模块，还配置为接收SMF返回的所述SMF处理所述4G会话信息得到的所述5G会话信息；和/或
    预留模块，配置为向所述5G网络系统的基站预留切换所需的资源；
    通知模块，配置为通知所述4G网络系统切换所需的资源已经预留成功。
  9. 一种网络系统的切换处理装置，应用于会话管理功能SMF，包括：
    第三接收模块，配置为接收认证管理功能AMF发送的PDU会话请求，其中，所述PDU会话请求包括：所述4G会话信息；
    处理模块，配置为至少通过以下方式处理所述4G会话信息得到的所述5G会话信息：
    根据收到的所述4G会话信息本地推导得到所述5G会话信息；或
    接收所述第二SMF发送的5G会话信息，在收到所述AMF发送的会话请求后，向所述AMF反馈所述5G会话信息。
  10. 一种网络系统的切换处理系统，其中，包括：
    认证管理功能AMF实体，配置为接收4G网络系统向5G网络系统的转发重置请求，选择会话管理功能SMF，并向选择的SMF发送分组数据单元PDU会话请求，其中，所述转发重置请求包括：4G会话 信息，所述PDU会话请求包括：所述4G会话信息；
    所述SMF，配置为向所述AMF返回所述4G会话信息对应的5G会话信息。
  11. 根据权利要求10所述的系统，其中，所述AMF，还用于接收SMF返回的所述SMF处理所述4G会话信息得到的所述5G会话信息；和/或还用于向所述5G网络系统的基站预留切换所需的资源，并通知所述4G网络系统切换所需的资源已经预留成功。
  12. 根据权利要求10所述的系统，其中，在所述5G网络系统的基站接收到所述终端发送的切换确认信息后，
    所述AMF，还配置为接收所述5G网络系统的基站发送的切换通知，请求建立所述5G网络系统的基站与所述用户面功能实体的通道，其中，所述用户面功能实体是指用户面功能实体UPF和PGW-U的合设功能，或，SMF与PGW-C合设功能控制的用户面功能实体；和/或
    在所述5G网络系统的基站接收到所述终端发送的切换确认信息之前，所述AMF，还配置为在收到所述5G会话信息后，请求建立所述5G网络系统的基站与所述用户面功能实体的通道，其中，所述用户面功能实体是指用户面功能实体UPF和PGW-U的合设功能，或，SMF与PGW-C合设功能控制的用户面功能实体。
  13. 根据权利要求10所述的系统，其中，所述SMF包括：第一SMF，第二SMF，第三SMF，
    所述第一SMF，还配置为根据所述4G会话信息本地推导得到所述5G会话信息；和/或
    所述第二SMF，还配置为将所述5G会话信息发送至所述第一SMF，其中，所述第一SMF在接收到所述AMF发送的切换请求后，向所述AMF反馈所述5G会话信息。
  14. 根据权利要求13所述的系统，其中，所述第三SMF还用于将所述5G会话信息发送至所述第一SMF，其中，所述第一SMF在接收到所述AMF发送的会话请求后，向所述AMF反馈所述5G会话信息，所述第一SMF和所述4G网络系统中的S-GW为合设网元。
  15. 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5中任一项所述的网络系统的切换处理方法，或权利要求6所述的网络系统的切换处理方法。
  16. 一种通信设备，包括存储器及处理器，所述处理器用于运行存储在所述存储器上的程序，其中，所述程序运行时执行权利要求1至5中任一项所述的网络系统的切换处理方法，或权利要求6所述的网络系统的切换处理方法。
PCT/CN2018/088267 2017-06-19 2018-05-24 网络系统的切换处理方法、装置及系统、存储介质 WO2018233445A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710466076.7A CN109151929B (zh) 2017-06-19 2017-06-19 网络系统的切换处理方法、装置及系统、存储介质
CN201710466076.7 2017-06-19

Publications (1)

Publication Number Publication Date
WO2018233445A1 true WO2018233445A1 (zh) 2018-12-27

Family

ID=64735499

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/088267 WO2018233445A1 (zh) 2017-06-19 2018-05-24 网络系统的切换处理方法、装置及系统、存储介质

Country Status (2)

Country Link
CN (1) CN109151929B (zh)
WO (1) WO2018233445A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020147760A1 (zh) * 2019-01-15 2020-07-23 华为技术有限公司 一种局域网通信方法、装置及系统
CN112367713A (zh) * 2020-11-05 2021-02-12 广州爱浦路网络技术有限公司 一种会话建立方法、会话释放方法及会话处理系统

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111491340B (zh) * 2019-01-29 2021-11-02 大唐移动通信设备有限公司 一种通信系统切换方法、网络侧设备、装置和介质
CN111629411B (zh) * 2019-02-27 2021-08-20 华为技术有限公司 一种通信系统间转移的方法以及相关设备
EP3935764A1 (en) * 2019-03-21 2022-01-12 Huawei Technologies Co., Ltd. Network entities and methods for a wireless network system for determining time information
CN112105014B (zh) * 2019-06-17 2023-06-20 中国电信股份有限公司 4g与5g网络互操作的方法、装置、系统及设备
CN112333777B (zh) * 2019-08-05 2022-04-01 中国移动通信有限公司研究院 一种移动性处理方法、装置及设备
CN112449367B (zh) * 2019-08-28 2023-05-26 中国联合网络通信集团有限公司 一种数据传输方法和核心网设备
CN112867039B (zh) * 2019-11-28 2022-04-05 大唐移动通信设备有限公司 一种用户面网元故障处理方法和装置
CN111065101A (zh) * 2019-12-30 2020-04-24 全链通有限公司 基于区块链的5g通信信息加解密方法、设备及存储介质
CN114727361A (zh) * 2021-01-04 2022-07-08 中国移动通信有限公司研究院 一种用于网络功能选择的处理方法、装置和网络设备
CN114222341B (zh) * 2021-12-21 2023-08-01 中国联合网络通信集团有限公司 会话接续方法和会话管理功能实体

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101128043B (zh) * 2006-08-15 2011-02-02 华为技术有限公司 系统间切换或者改变时的数据处理方法
CN101175313B (zh) * 2006-11-02 2011-08-10 华为技术有限公司 分组交换域业务的通信方法、系统及设备
US8477724B2 (en) * 2010-01-11 2013-07-02 Research In Motion Limited System and method for enabling session context continuity of local service availability in local cellular coverage
US8767584B2 (en) * 2010-01-29 2014-07-01 Alcatel Lucent Method and apparatus for analyzing mobile services delivery
CN102196405B (zh) * 2010-03-16 2015-09-16 中兴通讯股份有限公司 移动性管理实体获取会话管理信息参数的方法和系统

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"NR; NR and NG-RAN overall description; stage 2 (release 15)", 3GPP TS 38.300 V0.3.1, 9 June 2017 (2017-06-09) *
"Procedures for the 5G system; stage 2", 3GPP TS 23.502 V0.4.0, 2 June 2017 (2017-06-02), pages 77 - 79 *
JUNESOK, K. ET AL.: "3GPP SA2 Architecture and functions for 5G mobile communication system", THE KOREAN INSTITUTE OF COMMUNICATION AND INFORMATION SCIENCES, 13 April 2017 (2017-04-13) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020147760A1 (zh) * 2019-01-15 2020-07-23 华为技术有限公司 一种局域网通信方法、装置及系统
CN112367713A (zh) * 2020-11-05 2021-02-12 广州爱浦路网络技术有限公司 一种会话建立方法、会话释放方法及会话处理系统
CN112367713B (zh) * 2020-11-05 2021-08-31 广州爱浦路网络技术有限公司 一种会话建立方法、会话释放方法及会话处理系统

Also Published As

Publication number Publication date
CN109151929B (zh) 2021-09-03
CN109151929A (zh) 2019-01-04

Similar Documents

Publication Publication Date Title
WO2018233445A1 (zh) 网络系统的切换处理方法、装置及系统、存储介质
CN111247832B (zh) Pdn和pdu会话类型映射和能力发现
US10911990B2 (en) Network handover method and related device
KR102162778B1 (ko) 차세대 코어 네트워크에의 접속성을 위한 레거시 무선 액세스 기술들과의 상호연동
EP3979707B1 (en) Method for initiating user plane path modification in a communications system
WO2019158109A1 (zh) 一种网元的选择方法及装置
EP3955641B1 (en) Switching between network based and relay based operation for mission critical voice call
JP6721081B2 (ja) 通信システム
KR102452940B1 (ko) 무선 통신 시스템에서 이동성 향상을 위한 방법 및 장치
JP7025528B2 (ja) ネットワークハンドオーバ方法、装置、およびシステム
WO2018145671A1 (zh) 跨系统的切换方法和装置、计算机存储介质
JP7307060B2 (ja) ベアラ識別子を決定する方法及び装置、並びに記憶媒体
WO2018145670A1 (zh) 基站的切换方法、系统和存储介质
KR102058954B1 (ko) 무선 통신 시스템에서 small data를 효율적으로 전송하는 방법 및 장치
CN113316223B (zh) 一种状态切换方法及装置
WO2020063649A1 (zh) 网络服务控制方法及通信设备
WO2017162121A1 (zh) 用户面服务网关选择方法及系统
EP3286981B1 (en) Communication system
WO2022057673A1 (zh) 通信方法及装置
US10412640B2 (en) Switching control method, apparatus, and wireless communications network
WO2019037500A1 (zh) 一种选择无线接入网设备的方法及装置
KR20220166294A (ko) 슬라이스 정보 업데이트를 위한 방법
WO2018001301A1 (zh) 用户设备的控制方法、装置及系统和网关
WO2018001247A1 (zh) 控制用户设备的方法、装置及系统和网关

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18821161

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 06.05.2020)

122 Ep: pct application non-entry in european phase

Ref document number: 18821161

Country of ref document: EP

Kind code of ref document: A1