CN110461015B

CN110461015B - Method and equipment for network switching

Info

Publication number: CN110461015B
Application number: CN201810427971.2A
Authority: CN
Inventors: 陈炜; 孙晓文; 孙滔; 刘超
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2018-05-07
Filing date: 2018-05-07
Publication date: 2021-11-19
Anticipated expiration: 2038-05-07
Also published as: CN110461015A

Abstract

The embodiment of the invention relates to a method and equipment for network handover, which are used for solving the problems of a scheme that how an AMF in 5G selects an MME in 4G and how an MME in 4G selects an AMF in 5G when network handover is carried out in the prior art. In the embodiment of the invention, the AMF can determine the corresponding MME equipment identification information through the target position information of the UE and the network side access equipment information of the UE, so that the terminal executes the corresponding switching between the AMF and the MME corresponding to the determined MME equipment identification information.

Description

Method and equipment for network switching

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for network handover.

Background

With the rapid development of mobile internet and mobile network, the mobile network needs to satisfy more diversified service scenarios, such as low power consumption, large connection, high hotspot capacity, continuous wide area coverage, low delay, high reliability, and the like. However, the method for serving various application scenarios based on a set of logic architecture in the mobile network has not been able to meet the demand of the network.

Currently, a new network architecture and service operation mode, i.e. network slice, is generated in the mobile network. An operator may customize and deploy different network slices to meet the needs of different service scenarios, with different network slices consisting of different or shared access network functions and core network functions. For example, there is DCN (Dedicated Core Network, Core Network) feature in the 4G Network, and the Network slice indicates that different users can access different DCN networks, i.e. different Core networks. However, a corresponding network to which a handover is required in the process of performing a network handover is not yet available, for example, an Access and Mobility Management function (AMF) in a 5G network and a Mobility Management function (MME) in a 4G network support selection of the MME and the AMF, respectively, but the selection method is not detailed.

In summary, in the process of performing network handover in the prior art, there is no specific scheme for how to select handover between the AMF in 5G and the MME in 4G.

Disclosure of Invention

The invention provides a method and equipment for network handover, which are used for solving the problem that in the prior art, no scheme for selecting an MME in 4G by an AMF in 5G and selecting an AMF in 5G by an MME in 4G during network handover exists.

In a first aspect, an embodiment of the present invention provides a method for performing network handover, where the method includes:

the AMF determines corresponding MME equipment identification information according to the target position information of the UE and the network side access equipment information of the UE; and the AMF and the MME corresponding to the determined MME equipment identification information carry out the switching process of the terminal.

In the method, the AMF in the 5G can determine the corresponding MME equipment identification information through the target position information of the UE and the network side access equipment information of the UE, so that the terminal executes the corresponding switching between the AMF and the MME corresponding to the determined MME equipment identification information.

In a possible implementation manner, the network side access device information of the UE includes part or all of the following:

the user uses the Type UE Usage Type, the AMF Region identification information of the AMF, the AMF Set identification information of the AMF, and the single network slice selection auxiliary information S-NSSAI.

According to the method, the content specifically included by the equipment information is definitely given, so that the corresponding MME equipment identification information is determined according to the UE use Type, the AMF Region identification information of the AMF, the AMF Set identification information of the AMF and the S-NSSAI.

In one possible implementation, the network side access device information of the UE includes a UE Usage Type; before the AMF determines the corresponding MME equipment identification information according to the target position information of the UE and the network side access equipment information of the UE, the AMF sends the UE signed S-NSSAI to the data management equipment; and the AMF receives the UE Usage Type corresponding to the S-NSSAI returned by the data management equipment.

According to the method, the UE Usage Type corresponding to the S-NSSAI can be accurately determined in the data management equipment according to the S-NSSAI signed by the UE.

In one possible implementation, the UE Usage Type received by the AMF is determined by the data management according to the first correspondence between the S-NSSAI subscribed by the UE and the UE Usage Type.

According to the method, the corresponding relation between the S-NSSAI signed by the UE and the UE Usage Type is definitely stored in the data management equipment, so that when one information is determined, the other information can be determined according to the corresponding relation.

In a possible implementation manner, when the AMF determines corresponding MME device identification information according to the target location information of the UE and the network side access device information of the UE, the AMF sends the target location information of the UE and the network side access device information of the UE to the network function management device; and the AMF receives the MME equipment identification information returned by the network function management equipment.

According to the method, the AMF can accurately determine the target position information of the UE and the MME equipment identification information corresponding to the network side access equipment information of the UE through the network function management equipment according to the target position information of the UE and the network side access equipment information of the UE, so that the AMF and the MME corresponding to the determined MME equipment identification information perform network switching.

In a second aspect, an embodiment of the present invention provides a method for performing network handover, where the method includes:

the network function management equipment determines the received target position information of the UE from the AMF and MME equipment identification information corresponding to the network side access equipment information of the UE according to the second corresponding relation of the target position information of the UE, the network side access equipment information of the UE and the MME equipment identification information; and the network function management equipment returns the MME equipment identification information to the AMF.

In the method, the network function management device assists the AMF to confirm the MME device identification information, so that the corresponding MME device identification information can be accurately determined, the MME corresponding to the AMF in the switching process is further determined, and finally the switching between the AMF and the MME is performed.

In a possible implementation manner, the network function management device returns the default MME device identification information to the AMF after failing to determine the corresponding MME device identification information according to the second correspondence.

According to the method, after the corresponding MME equipment identification information cannot be determined, the default MME equipment identification information is returned to the AMF, and the AMF can be switched with the MME.

In a third aspect, an embodiment of the present invention provides a method for performing network handover, where the method includes:

the MME determines corresponding AMF identification information according to the target position information of the UE, or determines corresponding AMF identification information according to the target position information of the UE and the network side access equipment information; and the MME and the AMF corresponding to the AMF identification information perform the switching process of the terminal.

In the method, the MME in 4G can determine the corresponding indication information for determining the AMF identification information through the target position information of the UE, so that the terminal executes the corresponding switching between the MME and the AMF corresponding to the determined AMF identification information, meanwhile, the MME can also determine the corresponding indication information for determining the AMF identification information according to the target position information of the UE and the network side access equipment information, so that the AMF identification information can be determined according to the determined indication information for determining the AMF identification information, and finally, the terminal executes the corresponding switching between the MME and the AMF corresponding to the determined AMF identification information, because the indication information for determining the AMF identification information can be accurately determined according to the target position information of the UE or according to the target position information of the UE and the network side access equipment information, so that the indication information for determining the AMF identification information can be further determined according to the indication information for determining the AMF identification information, the AMF corresponding to the MME in the switching process is determined, the switching between the MME and the AMF is finally carried out, the AMF to which the switching is required can not be determined definitely in the network switching process, and a detailed scheme for the MME to select the AMF in the network switching process is further provided.

In a possible implementation manner, when the MME determines the corresponding AMF identification information according to the target location information of the UE, the MME sends the target location information of the UE to the DNS system, and receives the AMF identification information corresponding to the target location information of the UE returned by the DNS system.

In a possible implementation manner, when the MME determines corresponding AMF identification information according to target location information of the UE and network side access device information, the MME sends the target location information of the UE and a UE Usage Type in the network side access device information to the DNS system, and receives the target location information of the UE returned by the DNS system and the AMF identification information corresponding to the UE Usage Type in the network side access device information; or the MME sends the target location information of the UE and the S-NSSAI in the network side access equipment information to the DNS system, and receives the target location information of the UE returned by the DNS system and the AMF identification information corresponding to the S-NSSAI in the network side access equipment information.

In the method, the MME sends target location information of the UE, or UE Usage Type in the target location information of the UE and network side access equipment information, or S-NSSAI in the target location information of the UE and network side access equipment information to the DNS system; and receiving AMF identification information corresponding to the target location information of the UE returned by the DNS system, or receiving the target location information of the UE returned by the DNS system and AMF identification information corresponding to the UE Usage Type of the UE, or receiving the target location information of the UE and AMF identification information corresponding to S-NSSAI in the network side access device information, and accurately determining the AMF needing to be switched according to the AMF identification information, thereby executing the network switching of the MME and the determined AMF.

In a possible implementation manner, when the MME determines the corresponding AMF identification information, if the MME receives a plurality of AMF identification information, selecting one from the plurality of AMF identification information; when the MME and the AMF corresponding to the AMF identification information perform the handover procedure of the terminal, the MME and the AMF corresponding to the selected AMF identification information perform the handover procedure of the terminal.

In the method, when the MME receives a plurality of AMF identification information, one AMF identification information is selected from the plurality of AMF identification information, and when performing handover, the AMF corresponding to the selected AMF identification information performs corresponding network handover.

In a fourth aspect, a method for performing network handover provided in an embodiment of the present invention includes:

the DNS system determines indicating information for determining AMF identification information according to the received target location information of the UE from the MME, or determines indicating information for determining AMF identification information according to the received target location information of the UE from the MME and the network side access equipment information; and the DNS system returns at least one piece of AMF identification information in the indication information for determining the AMF identification information to the MME.

According to the method, the DNS system assists the MME to confirm the AMF identification information, so that the corresponding AMF identification information can be accurately determined, the AMF corresponding to the MME in the switching process is further determined, and finally switching between the MME and the AMF is performed.

In a possible implementation manner, the DNS system determines the indication information of the AMF identification information according to the target location information of the UE received from the MME, and the DNS system determines the indication information of the AMF identification information corresponding to the target location information of the UE received from the MME according to the second corresponding relationship between the target location information of the UE and the indication information of the AMF identification information.

According to the method, the DNS system determines the AMF identification information according to the target position information of the UE, so that the MME can perform switching between the MME and the AMF after determining the AMF according to the AMF identification information.

In a possible implementation manner, the DNS system determines, according to a third correspondence between target location information of the UE and UE Usage Type in the network side access device information, and the received target location information of the UE from the MME, and the UE Usage Type in the network side access device information, and the indication information for determining the AMF identification information, according to the third correspondence between the target location information of the UE and the indication information for determining the AMF identification information, which corresponds to the UE Usage Type in the network side access device information; or

And the DNS system determines the received target location information of the UE from the MME and the indication information which is corresponding to the S-NSSAI in the network side access equipment information and is used for determining the AMF identification information according to the fourth corresponding relation of the target location information of the UE, the S-NSSAI in the network side access equipment information and the indication information used for determining the AMF identification information.

In the method, the DNS system determines the AMF identification information according to the target position information of the UE and the network side access equipment information, so that the MME can perform switching between the MME and the AMF after determining the AMF according to the AMF identification information, and the network side access equipment information is definitely given as UE use Type and S-NSSAI.

In a possible implementation manner, if the domain name system DNS system determines that the target location information of the UE from the MME is not received, the target location information of the UE is sent to the NRF, and the indication information for determining the AMF identification information corresponding to the target location information of the UE from the NRF is returned to the MME.

In a possible implementation manner, if the DNS system determines that the target location information of the UE and the UE Usage Type in the network side access device information are not received from the MME, the DNS system sends the target location information of the UE and the UE Usage Type in the network side access device information to the NRF, and returns the received target location information of the UE from the NRF and the indication information for determining the AMF identification information corresponding to the UE Usage Type in the network side access device information to the MME; or

And if the DNS system determines that the target location information of the UE from the MME and the S-NSSAI in the network side access equipment information are not received, the DNS system sends the target location information of the UE and the S-NSSAI in the network side access equipment information to the NRF, and returns the received indication information which is used for determining the AMF identification information and corresponds to the target location information of the UE from the NRF and the S-NSSAI in the network side access equipment information to the MME.

The method ensures that the DNS can determine the indication information for determining the AMF identification information when the DNS does not store the corresponding relation between the target position information of the UE and the indication information for determining the AMF identification information, or does not store the corresponding relation between the target position information of the UE, the UE Usage Type of the UE and the indication information for determining the AMF identification information, or does not store the corresponding relation between the target position information of the UE, the S-NSSAI and the indication information for determining the AMF identification information, thereby determining the AMF required during switching and ensuring normal network switching.

In a fifth aspect, an embodiment of the present invention provides an apparatus for performing network handover, where the apparatus includes: a processor and a transceiver:

the processor is configured to: determining corresponding MME equipment identification information according to the target position information of the UE and the network side access equipment information of the UE; and the MME corresponding to the MME equipment identification information performs the switching process of the terminal.

In a sixth aspect, an embodiment of the present invention provides an apparatus for performing network handover, where the apparatus includes: a processor and a transceiver:

the processor is configured to: determining the received target position information of the UE from the AMF and MME equipment identification information corresponding to the network side access equipment information of the UE according to the second corresponding relation of the target position information of the UE, the network side access equipment information of the UE and the MME equipment identification information; and returning the MME equipment identification information to the AMF.

In a seventh aspect, an embodiment of the present invention provides an apparatus for performing network handover, where the apparatus includes: a processor and a transceiver:

the processor is configured to: determining corresponding AMF identification information according to the target position information of the UE, or determining corresponding AMF identification information according to the target position information of the UE and the network side access equipment information; and the AMF corresponding to the AMF identification information performs the switching process of the terminal.

In an eighth aspect, an embodiment of the present invention provides an apparatus for performing network handover, where the apparatus includes: a processor and a transceiver:

the processor is configured to:

according to the received target position information of the UE from the MME, determining the indication information for determining the AMF identification information, or according to the received target position information of the UE from the MME and the network side access equipment information, determining the indication information for determining the AMF identification information; and returning at least one piece of AMF identification information in the indication information for determining the AMF identification information to the MME.

In a ninth aspect, an embodiment of the present invention further provides an apparatus for performing network handover, where the apparatus includes: at least one processing unit and at least one memory unit, wherein the memory unit stores program code that, when executed by the processing unit, causes the processing unit to perform the steps of the method of any of the first, second, third and fourth aspects.

In a tenth aspect, an embodiment of the present invention provides a computer storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements an aspect of any one of the first, second, third, and fourth aspects.

In addition, for technical effects brought by any one implementation manner of the fifth aspect to the tenth aspect, reference may be made to technical effects brought by different implementation manners of the first aspect to the fourth aspect, and details are not described here again.

These and other aspects of the present application will be more readily apparent from the following description of the embodiments.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic diagram of a 5G architecture according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a system for performing network handover according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first device for performing network handover according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a second apparatus for performing network handover according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a third apparatus for performing network handover according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a fourth apparatus for performing network handover according to a second embodiment of the present invention;

fig. 7 is a flowchart of a first method for performing network handover according to a first embodiment of the present invention;

fig. 8 is a flowchart of a second method for performing network handover according to a second embodiment of the present invention;

fig. 9 is a schematic structural diagram of another system for performing network handover according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a fifth apparatus for performing network handover according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a sixth apparatus for performing network handover according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a seventh apparatus for performing network handover according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of an eighth apparatus for performing network handover according to an embodiment of the present invention;

fig. 14 is a flowchart of a third method for performing network handover according to the embodiment of the present invention;

fig. 15 is a flowchart of a fourth method for performing network handover according to the embodiment of the present invention.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings. The particular methods of operation in the method embodiments may also be applied to apparatus embodiments or system embodiments. In the description of the present application, the term "plurality" means two or more unless otherwise specified.

The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

With the development of technology, 5G technology is gradually appearing in the field of vision of people, but for reasons such as signal and so on in the privately written area, some User Equipments (UEs) cannot support the use of 5G, so that it is necessary to perform handover between an access and mobility management function (AMF) in 5G and an MME in 4G.

FIG. 1 is a schematic diagram of a 5G architecture. The architecture includes a User Equipment (UE), (radio) access network (R) AN equipment, a User Plane Function (UPF) network element, a data network (data network, DN), AN access and mobility management function (AMF) network element, a security anchor function (SEAF) network element, a Session Management Function (SMF) network element, a Policy Control Function (PCF) network element, AN authentication service function (AUSF) network element, a Unified Data Management (UDM) network element, and AN authentication credential storage and processing function (ARPF) network element. The SEAF network element and the AMF network element may be deployed in a unified manner, for example, the SEAF may be a function of the AMF network element; alternatively, the SEAF network elements may be deployed separately from the AMF network elements.

The UE and the SEAF/AMF network element communicate through an N1 interface; (R) the AN equipment communicates with the SEAF/AMF network element through AN N2 interface; the RAN equipment and the UPF network element communicate through an N3 interface; the UPF network element and the SMF network element communicate through an N4 interface; the UPF network element communicates with the DN through an N6 interface; the SMF network element and the PCF network element communicate through an N7 interface; the SEAF/AMF network element and the ARPF/UDM network element communicate through an N8 interface; different UPF network elements communicate through an N9 interface; the SMF network element and the ARPF/UDM network element communicate through an N10 interface; the SEAF/AMF network element and the SMF network element communicate through an N11 interface; the SEAF/AMF network element and the AUSF network element are communicated through an N12 interface; the AUSF network element and the ARPF/UDM network element communicate through an N13 interface; different SEAF/AMF network elements communicate with each other through an N14 interface; the SEAF/AMF network element and the PCF network element communicate through an N15 interface.

The UE may be a cell phone, tablet, etc.

The AMF network element is mainly responsible for mobility management in the mobile network, such as user location update, user registration network, user handover, etc.

The UDM network element is mainly responsible for managing subscription data and notifying the corresponding network element when the subscription data is modified.

As shown in fig. 2, a schematic structural diagram for performing network handover provided by the present application includes:

the AMF20 is used for determining corresponding MME equipment identification information according to the target location information of the UE and the network side access equipment information of the UE; the MME corresponding to the MME equipment identification information performs the switching process of the terminal;

the network function management device 21 is configured to determine, according to a first correspondence between target location information of the UE, network side access device information of the UE, and MME device identification information corresponding to the network side access device information of the UE, the received target location information of the UE from the AMF; and returning the MME equipment identification information to the AMF.

In the embodiment of the invention, the AMF can determine the corresponding MME equipment identification information through the target position information of the UE and the network side access equipment information of the UE, so that the terminal executes the corresponding switching of the AMF and the MME corresponding to the determined MME equipment identification information.

Wherein, the target location information of the UE may be TAI (Tracking Area Identity); and the device information includes, but is not limited to, not too much or all of the following: the user uses a Type UE Usage Type, the AMF Region identification information of the AMF, the AMF Set identification information of the AMF, and single network slice selection auxiliary information S-NSSAI.

Wherein the network function management device includes but is not limited to some or all of the following:

NRF (NF redundancy Function), network Function Repository Function, and DNS (Domain Name System) System.

Specifically, when the AMF determines the corresponding MME device identification information according to the target location information of the UE and the network side access device information of the UE, because the network side access device information of the UE includes the above four types, the AMF may determine, according to the target location information of the UE and the UE use Type, and/or the AMF Region identifier information belonging to the AMF, and/or the AMF Set identifier information belonging to the AMF, and/or the S-NSSAI, that is, when the AMF determines an MME, the target location information of the UE is necessary, and then at least one of the UE Usage Type, the AMF Region identification information to which the AMF belongs, the AMF Set identification information to which the AMF belongs, and the S-NSSAI needs to determine, therefore, after any information in the network side access device information of the UE is determined, the MME device identification information corresponding to the AMF can be determined by combining with the target location information of the UE.

Wherein the MME device identification information includes, but is not limited to, part or all of the following: an identity of the MME device, an address of the MME device.

Based on the above, the following describes in detail a scheme of the AMF in determining the corresponding MME, taking as an example any one of the target location information of the UE and the network side access device information of the UE.

The first condition is as follows: and the AMF determines corresponding MME equipment identification information according to the target position information of the UE and the AMF Region identification information of the AMF.

Optionally, when determining the corresponding MME device identification information according to the target location information of the UE and the AMF Region identification information to which the AMF belongs, the AMF sends the target location information of the UE and the AMF Region identification information to which the AMF belongs to the network function management device;

correspondingly, the network function management equipment determines the received target position information of the UE from the AMF and MME equipment identification information corresponding to the AMF Region identification information of the AMF according to the corresponding relation among the target position information of the UE, the AMF Region identification information of the AMF and the MME equipment identification information;

and the network function management equipment returns the MME equipment identification information to the AMF.

Correspondingly, the AMF receives target location information of the UE returned by the network function management equipment and MME equipment identification information corresponding to the AMF Region identification information of the AMF, and the AMF determines an MME to be switched to according to the received identification information of the MME;

and performing network switching between the AMF and the MME.

Specifically, when the terminal determines that network handover is required according to the target location information of the UE, the terminal executes a handover request and sends the handover request to the AMF, and after receiving the handover request, the AMF sends the target location information of the UE and the AMF Region identification information to which the AMF belongs to a network function management device, and after determining the received target location information of the UE from the AMF and the AMF Region identification information to which the AMF belongs, the network function management device determines corresponding MME device identification information; and sending the determined corresponding MME equipment identification information to the AMF, so that the AMF and the MME corresponding to the MME equipment identification information perform the switching process of the terminal. The AMF may determine target location information of the UE and AMF Region identification information to which the AMF belongs.

The network function management device stores the target location information of the UE and the corresponding relation between the AMF Region identification information of the AMF and the MME device identification information.

Case two: and the AMF determines corresponding MME equipment identification information according to the target position information of the UE and the identification information of the AMF Set to which the AMF belongs.

And the AMF determines corresponding MME equipment identification information according to the target position information of the UE and the identification information of the AMF Set to which the AMF belongs.

Optionally, when determining the corresponding MME device identification information according to the target location information of the UE and the identification information of the AMF Set to which the AMF belongs, the AMF sends the target location information of the UE and the identification information of the AMF Set to which the AMF belongs to the network function management device;

correspondingly, the network function management equipment determines the received target position information of the UE from the AMF and MME equipment identification information corresponding to the identification information of the AMF Set belonging to the AMF according to the corresponding relation among the target position information of the UE, the identification information of the AMF Set belonging to the AMF and the MME equipment identification information;

Correspondingly, the AMF receives the target location information of the UE returned by the network function management device and MME device identification information corresponding to the identification information of the AMF Set to which the AMF belongs, and the AMF determines an MME to be switched to according to the received MME identification information;

and performing network switching between the AMF and the MME.

Specifically, when the terminal determines that network handover is required according to the target location information of the UE, the terminal executes a handover request and sends the handover request to the AMF, and after receiving the handover request, the AMF sends the target location information of the UE and the identifier information of the AMF Set to which the AMF belongs to a network function management device, and after determining the received target location information of the UE from the AMF and the identifier information of the AMF Set to which the AMF belongs, the network function management device determines corresponding MME device identifier information; and sending the determined corresponding MME equipment identification information to the AMF, so that the AMF and the MME corresponding to the MME equipment identification information perform the switching process of the terminal. The AMF may determine target location information of the UE and identification information of an AMF Set to which the AMF belongs.

The network function management device stores the target location information of the UE and the corresponding relation between the identification information of the AMF Set to which the AMF belongs and the identification information of the MME device.

Case three: and the AMF determines corresponding MME equipment identification information according to the target position information of the UE and the S-NSSAI.

Optionally, when determining the corresponding MME device identification information according to the target location information and S-NSSAI of the UE, the AMF sends the target location information and S-NSSAI of the UE to the network function management device;

correspondingly, the network function management equipment determines the received target position information of the UE from the AMF and the MME equipment identification information corresponding to the S-NSSAI according to the corresponding relation of the target position information of the UE, the S-NSSAI and the MME equipment identification information;

Correspondingly, the AMF receives the target location information of the UE and the MME device identification information corresponding to the S-NSSAI, which are returned by the network function management device, and the AMF determines the MME to which the handover is required according to the received MME identification information;

and performing network switching between the AMF and the MME.

Specifically, when the terminal determines that network handover is required according to the target location information of the UE, the terminal executes a handover request and sends the handover request to the AMF, and when the AMF receives the handover request, the AMF sends the target location information of the UE and the S-NSSAI to a network function management device, and after determining the received target location information of the UE from the AMF and the S-NSSAI, the network function management device determines corresponding MME device identification information; and sending the determined corresponding MME equipment identification information to the AMF, so that the AMF and the MME corresponding to the MME equipment identification information perform the switching process of the terminal. Wherein the AMF may determine the target location information of the UE and the S-NSSAI.

The network function management device stores the target location information of the UE and the corresponding relation between the S-NSSAI and the MME device identification information.

Case four: and the AMF determines corresponding MME equipment identification information according to the target position information of the UE and the UE Usage Type.

Optionally, the AMF sends an S-NSSAI subscribed by the UE to the data management device; and the AMF receives the UE Usage Type corresponding to the S-NSSAI returned by the data management equipment.

The data management equipment stores the corresponding relation between the S-NSSAI and the UE Usage Type; that is, the UE Usage Type received by the AMF is determined by the data management according to the first correspondence between the S-NSSAI subscribed by the UE and the UE Usage Type.

And the data management device includes, but is not limited to, some or all of the following:

UDM (User Date management), NSSF (Network slice selection function).

In implementation, the AMF sends S-NSSAI to the data management equipment, and the data management equipment comprises the corresponding relation between the S-NSSAI and the UE Usage Type, so that the UE Usage Type corresponding to the S-NSSAI can be determined.

In the embodiment of the invention, after the AMF determines the target position information of the UE and the UE Usage Type, the AMF sends the target position information of the UE and the UE Usage Type of the UE to the network function management equipment;

correspondingly, the network function management equipment determines the received target position information of the UE from the AMF and the MME equipment identification information corresponding to the UE Usage Type according to the corresponding relation of the target position information of the UE, the UE Usage Type and the MME equipment identification information; and returning the MME equipment identification information to the AMF;

specifically, after receiving MME device identification information returned by the network function management device, the AMF determines, according to the MME device identification information, an MME to be switched to; and performing network switching between the AMF and the MME.

Optionally, the network function management device returns default MME device identification information to the AMF after failing to determine corresponding MME device identification information according to the first corresponding relationship.

Specifically, the function management device determines that no MME device identification information corresponding to the UE target location information and the UE Usage Type is stored in the function management device according to the received UE target location information and the UE Usage Type, and the network function management device returns a default MME device identification information to the AMF, acquires the UE Usage Type supported by the user through a HSS (Home subscriber Server), and determines whether the acquired UE Usage Type matches the UE Usage Type supported by the MME corresponding to the default MME device identification information, if so, the AMF determines that the received default MME device identification information is a user that the user can serve, and performs network switching between the AMF and the MME, and if the AMF receives that the default MME device identification information is not a user that the user can serve, the AMF reports a message that the user cannot serve to the network function management device, and the network function management equipment retransmits the MME equipment identification information.

In implementation, after determining that there is no corresponding MME device identification information, a default address is returned, so that network handover can be performed between the AMF and the MME.

In the embodiment of the present invention, there is another implementation manner, that is, the AMF sends a request for acquiring MME device identification information to the network function management device, and the network function management device returns information related to MME device identification information stored in the AMF to the AMF after receiving the request sent by the AMF, where the information returned by the network function management device may be a correspondence between target location information of the UE and MME device identification information and/or a correspondence between target location information of the UE and identification information of an AMF Set to which the AMF belongs and/or a correspondence between target location information of the UE and identification information of an S-nsai and MME device identification information and/or a correspondence between target location information of the UE and a UE Usage Type and MME device identification information, it is also possible to identify the belonging set of information for the MME device; and after receiving the corresponding relation returned by the network function management equipment and/or the set to which the MME equipment identification information belongs, the AMF determines the corresponding MME equipment identification information according to the target position information of the UE and the network side access equipment information of the UE determined by the AMF, and then the AMF and the MME corresponding to the MME equipment identification information perform the switching process of the terminal.

As shown in fig. 3, a schematic structural diagram of a first device for performing network handover provided by the present application is shown, where the device includes: processor 300 and transceiver 301:

the processor 300 is configured to: determining corresponding MME equipment identification information according to the target position information of the UE and the network side access equipment information of the UE; and the MME corresponding to the MME equipment identification information performs the switching process of the terminal.

Optionally, the network side access device information of the UE includes part or all of the following:

the user uses a Type UE Usage Type, the AMF Region identification information of the AMF, the AMF Set identification information of the AMF, and single network slice selection auxiliary information S-NSSAI.

Optionally, if the network side access device information of the UE includes the UE Usage Type;

the processor 300 is configured to send a UE subscribed S-NSSAI to the data management device; and receiving the UE Usage Type corresponding to the S-NSSAI returned by the data management equipment.

Optionally, the UE Usage Type received by the processor is determined by the data management according to a first corresponding relationship between the S-NSSAI signed by the UE and the UE Usage Type.

Optionally, the processor 300 is specifically configured to:

sending target position information of the UE and network side access equipment information of the UE to network function management equipment; and receiving the MME equipment identification information returned by the network function management equipment.

As shown in fig. 4, a second apparatus for performing network handover provided by the present application includes: at least one processing unit 400 and at least one memory unit 401, wherein the memory unit 401 stores program code, which when executed by the processing unit 400, causes the processing unit 400 to perform the steps of any method when the AMF performs a network handover during a network handover procedure.

As shown in fig. 5, a third apparatus for performing network handover provided by the present application includes: processor 500 and transceiver 501:

the processor 500 is configured to: determining the received target position information of the UE from the AMF and MME equipment identification information corresponding to the network side access equipment information of the UE according to the second corresponding relation of the target position information of the UE, the network side access equipment information of the UE and the MME equipment identification information; and returning the MME equipment identification information to the AMF.

Optionally, the processor 500 is further configured to:

and according to the second corresponding relation, after the corresponding MME equipment identification information cannot be determined, returning default MME equipment identification information to the AMF.

As shown in fig. 6, a second apparatus for performing network handover provided by the present application includes: at least one processing unit 600 and at least one storage unit 601, wherein the storage unit 601 stores program code that, when executed by the processing unit 600, causes the processing unit 600 to perform the steps of any method when a network function management device performs a network handover during a network handover procedure.

In some possible embodiments, the aspects of the network switching according to the embodiments of the present invention may also be implemented in the form of a program product, which includes program code for causing a computer device to perform the steps of the method for processing a terminal path according to various exemplary embodiments of the present invention described in this specification, when the program code runs on the computer device.

The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

A program product for data forwarding control according to an embodiment of the present invention may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be run on a server device. However, the program product of the present invention is not limited thereto, and in this document, the readable storage medium may be any tangible medium containing or storing the program, which can be used by or in connection with an information transmission, apparatus, or device.

A readable signal medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium that can transmit, propagate, or transport the program for use by or in connection with the periodic network action system, apparatus, or device.

Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

Program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device.

The embodiment of the invention also provides a storage medium readable by the computing equipment in the method for switching the network, namely, the content is not lost after power failure. The storage medium stores therein a software program comprising program code which, when executed on a computing device, when read and executed by one or more processors, implements any of the above aspects of embodiments of the present invention when performing a network handover.

Based on the same inventive concept, the embodiment of the present invention further provides a method for performing network handover, and since the method corresponds to the method for performing network handover in the embodiment of the present invention, and the principle of the method for solving the problem is similar to that of the device, the method can be implemented by referring to the implementation of the method, and repeated details are not repeated.

As shown in fig. 7, a flowchart of a method for performing network handover provided by the present application specifically includes the following steps:

step 700, the AMF determines corresponding MME device identification information according to the target location information of the UE and the network side access device information of the UE;

step 701, the AMF and the MME corresponding to the MME device identification information perform the handover procedure of the terminal.

Optionally, the device information includes part or all of the following:

Optionally, if the network side access device information of the UE is the UE Usage Type;

before the AMF determines corresponding MME equipment identification information according to target position information of the UE and network side access equipment information of the UE, the AMF sends UE subscription S-NSSAI to data management equipment;

and the AMF receives the UE Usage Type corresponding to the S-NSSAI returned by the data management equipment.

Optionally, the UE Usage Type received by the AMF is determined by the data management according to a first corresponding relationship between the S-NSSAI subscribed by the UE and the UE Usage Type.

Optionally, when determining the corresponding MME device identification information according to the target location information of the UE and the network side access device information of the UE, the AMF sends the target location information of the UE and the network side access device information of the UE to the network function management device;

and the AMF receives MME equipment identification information returned by the network function management equipment.

Based on the same inventive concept, another method for performing network handover is also provided in the embodiments of the present invention, and since the method corresponds to the method for performing network handover in the embodiments of the present invention, and the principle of the method for solving the problem is similar to that of the device, the method can be implemented by referring to the implementation of the method, and repeated details are not repeated.

As shown in fig. 8, a flowchart of a method for performing network handover provided by the present application specifically includes the following steps:

step 800, the network function management device determines the received target location information of the UE from the AMF and MME device identification information corresponding to the network side access device information of the UE according to the second corresponding relationship among the target location information of the UE, the network side access device information of the UE and the MME device identification information;

step 801, the network function management device returns the MME device identification information to the AMF.

Optionally, the network function management device returns default MME device identification information to the AMF after failing to determine corresponding MME device identification information according to the second correspondence.

In this application, another system for performing network handover is also provided, as shown in fig. 9, a schematic structural diagram of another network handover, which is provided for the user, includes:

the MME90 is configured to determine corresponding AMF identification information according to the target location information of the UE, or determine corresponding AMF identification information according to the target location information of the UE and the network side access device information; performing a switching process of the terminal by using the AMF corresponding to the AMF identification information;

the DNS system 91 is configured to determine, according to the target location information of the UE received from the MME, the indication information used for determining the AMF identification information, or determine, according to the target location information of the UE and the network side access device information received from the MME, the indication information used for determining the AMF identification information; and returning at least one piece of AMF identification information in the indication information for determining the AMF identification information to the MME.

In the embodiment of the invention, the MME can determine the corresponding indicating information for determining the AMF identification information through the target position information of the UE, so that the terminal executes the corresponding switching of the MME and the AMF corresponding to the determined AMF identification information, meanwhile, the MME can also determine the corresponding indicating information for determining the AMF identification information according to the target position information of the UE and the network side access equipment information, so that the AMF identification information can be determined according to the determined indicating information for determining the AMF identification information, and finally, the terminal executes the corresponding switching of the MME and the AMF corresponding to the determined AMF identification information, because the indicating information for determining the AMF identification information can be accurately determined according to the target position information of the UE or according to the target position information of the UE and the network side access equipment information, so that the indicating information for determining the AMF identification information is further based on the indicating information for determining the AMF identification information, the AMF corresponding to the MME in the switching process is determined, the switching between the MME and the AMF is finally carried out, the AMF to which the switching is required can not be determined definitely in the network switching process, and a detailed scheme for the MME to select the AMF in the network switching process is further provided.

Wherein the AMF identification information includes, but is not limited to, part or all of the following: AMF device identification information, AMF address information.

In implementation, the AMF to be switched can be accurately determined according to any one of the AMF identification information.

For the above scheme, specific embodiments are given below, and a scheme of the MME for determining the corresponding AMF is described in detail.

The first embodiment is as follows: and the MME determines corresponding AMF identification information according to the target position information of the UE, and then the MME and the AMF determined according to the AMF identification information are switched.

Optionally, when the MME determines the corresponding AMF identification information according to the target location information of the UE, the MME sends the target location information of the UE to the DNS system, and receives the AMF identification information corresponding to the target location information of the UE returned by the DNS system.

Specifically, after the MME receives a request for network handover, the MME sends target location information of the UE to the DNS system. Correspondingly, the DNS system determines the indication information of the AMF identification information according to the received target location information of the UE from the MME.

In the embodiment of the present invention, after receiving the target location information of the UE sent by the MME, the DNS system queries, according to a second correspondence between the target location information of the UE stored in the DNS system and the indication information for determining the AMF identification information, determines whether there is the indication information for determining the AMF identification information corresponding to the target location information of the UE received, and returns the AMF identification information to the MME after determining that there is the indication information for determining the AMF identification information corresponding to the target location information of the UE received from the MME; and if the received indication information which is corresponding to the target location information of the UE from the MME and is used for determining the AMF identification information does not exist, the DNS system sends the target location information of the UE to the NRF.

In the following, detailed schemes are given for the above.

Scene one: and the DNS system has indication information which is used for determining AMF identification information and corresponds to the received target location information of the UE.

Optionally, when the DNS system determines the indication information of the AMF identification information according to the received target location information of the UE from the MME, the DNS system determines the indication information for determining the AMF identification information corresponding to the received target location information of the UE from the MME according to a second corresponding relationship between the target location information of the UE and the indication information for determining the AMF identification information.

Specifically, after receiving target location information of UE from MME, the DNS system determines that it stores target location information of the UE and indication information for determining AMF identification information according to the received target location information of the UE, finds the indication information for determining AMF identification information according to the received target location information of the UE, and returns the found indication information for determining AMF identification information to the MME;

correspondingly, the MME receives indication information which is corresponding to the target location information of the UE and is returned by the DNS system and is used for determining the AMF identification information, determines the AMF identification information according to the indication information for determining the AMF identification information, determines the AMF which needs to be switched according to the AMF identification information, and finally performs switching between the MME and the determined AMF.

In the embodiment of the present invention, when the DNS system returns information to the MME, AMF identification information may also be returned, that is, after the DNS system determines, according to the target location information of the UE, the indication information for determining the AMF identification information, the DNS system determines, according to the indication information for determining the AMF identification information, and finally returns the AMF identification information to the MME.

In implementation, because the indication information for determining the AMF identification information can be determined according to the target location information of the UE, and the indication information for determining the AMF identification information is returned to the MME, the MME can determine an accurate AMF and perform handover between the MME and the AMF.

Scene two: and the DNS system has indication information which is used for determining AMF identification information and corresponds to the received target location information of the UE.

Optionally, if the DNS system determines that the target location information of the UE from the MME is not received, the DNS system sends the target location information of the UE to the NRF, and returns the indication information for determining the AMF identification information corresponding to the target location information of the UE from the NRF to the MME.

Specifically, after receiving target location information of UE from MME, the DNS system determines, according to the received target location information of the UE, that the target location information of the UE and indication information for determining AMF identification information are stored in the DNS system, and when searching for the indication information for determining AMF identification information according to the received target location information of the UE, does not find a correspondence between the target location information of the UE and the indication information for determining AMF identification information, and when searching for the target location information of the UE, the DNS system may not find the received target location information of the UE; or the searched target position information of the UE does not have the corresponding relation for determining the AMF identification information;

at this time, the DNS system sends a request for assisting handover and target location information of the UE to the NRF;

correspondingly, the NRF determines the received indication information for determining the AMF identification information corresponding to the target location information of the UE according to the corresponding relation between the target location information of the UE and the indication information for determining the AMF identification information stored in the NRF, and returns the indication information for determining the AMF identification information to the DNS; after receiving the indication information for determining the AMF identification information returned by the NRF, the DNS sends the indication information for determining the AMF identification information to the MME;

optionally, the MME receives indication information for determining AMF identification information corresponding to target location information of the UE returned by the DNS system, determines the AMF identification information according to the indication information for determining the AMF identification information, determines an AMF to be switched according to the AMF identification information, and finally performs switching between the MME and the determined AMF.

In the embodiment of the present invention, if the NRF returns the instruction information for determining the AMF identification information to the DNS system, the DNS system may return the instruction information for determining the AMF identification information when returning information to the MME, and may also return the AMF identification information, that is, after the DNS system determines the instruction information for determining the AMF identification information according to the target location information of the UE, the DNS system determines the AMF identification information according to the instruction information for determining the AMF identification information, and finally returns the AMF identification information to the MME; or

If the NRF determines the indication information for determining the AMF identification information, but when returning information to the DNS system, the NRF first determines the AMF identification information according to the indication information for determining the AMF identification information, and then sends the AMF identification information to the DNS, and when the DNS system returns information to the MME, the AMF identification information is returned.

In implementation, after the DNS determines that the correspondence does not exist in the DNS, the DNS sends a request for assisting handover to the NRF, and simultaneously sends target location information of the UE to the NRF, and the NRF may determine corresponding indication information for determining AMF identification information according to the target location information of the UE, so that when the DNS does not store the correspondence between the target location information of the UE and the indication information for determining AMF identification information, the corresponding indication information for determining AMF identification information may also be determined, and then the AMF identification information is determined, and the AMF is determined according to the AMF identification information, thereby ensuring that network handover can be performed normally.

Example two: and the MME determines corresponding AMF identification information according to the target position information of the UE and the network side access equipment information, and then performs switching between the MME and the AMF determined according to the AMF identification information.

Wherein, the network side access device information includes but is not limited to part or all of the following: UE Usage Type, S-NSSAI.

In the embodiment of the present invention, when determining the corresponding AMF identification information according to the target location information of the UE and the network side access device information, the network side access device information may be one or more of the above, that is, the corresponding AMF identification information may be determined according to the target location information of the UE and the UE Usage Type in the network side access device information, or according to the target location information of the UE and the S-NSSAI in the network side access device information, or according to the target location information of the UE, the UE Usage Type in the network side access device information, and the S-NSSAI in the network side access device information.

Based on the above, the following describes a scheme for performing handover between the MME and the AMF in detail by taking any one of the target location information of the UE and the network side access device information as an example.

The first condition is as follows: and the MME determines corresponding AMF equipment identification information according to the target position information of the UE and the UE Usage Type in the network side access equipment information.

Optionally, when the MME determines corresponding AMF identification information according to target location information of the UE and network side access device information, the MME sends the target location information of the UE and a UE Usage Type in the network side access device information to the DNS system, and receives the target location information of the UE returned by the DNS system and the AMF identification information corresponding to the UE Usage Type in the network side access device information;

specifically, after the MME receives a request for network handover, the MME sends target location information of the UE and a UE Usage Type in the network side access device information to the DNS system. Correspondingly, the DNS system determines the indication information of the AMF identification information according to the received target location information of the UE from the MME and the UE Usage Type in the network side access equipment information.

In the embodiment of the present invention, after receiving the target location information of the UE and the UE Usage Type in the network side access device information, which are sent by the MME, the DNS system queries, according to a third correspondence between the target location information of the UE stored in the DNS system and the UE Usage Type in the network side access device information and indication information for determining AMF identification information, determines whether there is received target location information of the UE and indication information for determining AMF identification information corresponding to the UE Usage Type in the network side access device information, and returns the AMF identification information to the MME after determining that there is received target location information of the UE from the MME and the indication information for determining AMF identification information corresponding to the UE Usage Type in the network side access device information; and if the received target location information of the UE from the MME and the indication information which is corresponding to the UE Usage Type in the network side access equipment information and is used for determining the AMF identification information do not exist, the DNS system sends the target location information of the UE and the UE Usage Type in the network side access equipment information to the NRF.

In the following, detailed schemes are given for the above.

Scene one: the DNS system comprises received target position information of the UE and indication information which is corresponding to the UE Usage Type in the network side access equipment information and is used for determining AMF identification information.

Optionally, the DNS system determines, according to a third correspondence between the target location information of the UE, the UE Usage Type in the network side access device information, and the indication information for determining the AMF identifier information, the received target location information of the UE from the MME, and the indication information for determining the AMF identifier information corresponding to the UE Usage Type in the network side access device information.

Specifically, after receiving target location information of the UE from the MME and a UE Usage Type in the network side access device information, the DNS system determines, according to the received target location information of the UE and the UE Usage Type in the network side access device information, that the target location information of the UE, the UE Usage Type in the network side access device information, and indication information used for determining the AMF identification information are stored in the DNS system, searches the indication information used for determining the AMF identification information according to the received target location information of the UE and the UE Usage Type in the network side access device information, and returns the found indication information used for determining the AMF identification information to the MME;

correspondingly, the MME receives the target location information of the UE returned by the DNS system and the indication information corresponding to the UE Usage Type in the network side access device information and used for determining the AMF identification information, determines the AMF identification information according to the indication information used for determining the AMF identification information, determines the AMF to be switched according to the AMF identification information, and finally performs switching between the MME and the determined AMF.

In the embodiment of the present invention, when the DNS system returns information to the MME, AMF identification information may also be returned, that is, after the DNS system determines, according to the target location information of the UE and the UE Usage Type in the network side access device information, the indication information for determining the AMF identification information, the DNS system determines, according to the indication information for determining the AMF identification information, and finally returns the AMF identification information to the MME.

In implementation, because the indication information for determining the AMF identification information may be determined according to the target location information of the UE and the UE Usage Type in the network side access device information, and the indication information for determining the AMF identification information is returned to the MME, the MME may determine an accurate AMF and perform handover between the MME and the AMF.

Scene two: and indication information which is used for determining the AMF identification information and corresponds to the UE Usage Type in the network side access equipment information and is not received in the DNS system.

Optionally, if the DNS system determines that the target location information of the UE from the MME and the UE Usage Type in the network side access device information are not received, the DNS system sends the target location information of the UE and the UE Usage Type in the network side access device information to the NRF, and returns the received indication information for determining the AMF identification information, which corresponds to the target location information of the UE from the NRF and the UE Usage Type in the network side access device information, to the MME;

specifically, after receiving the target location information of the UE from the MME and the UE Usage Type in the network side access device information, the DNS system determines, according to the received target location information of the UE and the UE Usage Type in the network side access device information, that the target location information of the UE, the UE Usage Type in the network side access device information, and the indication information used for determining the AMF identification information are stored in the DNS system, and when searching for the indication information used for determining the AMF identification information according to the received target location information of the UE and the UE Usage Type in the network side access device information, the DNS system may not search the target location information of the received UE when searching for the indication information used for determining the AMF identification information, and does not search for the target location information of the UE, the UE Usage Type in the network side access device information, and the corresponding relationship used for determining the AMF identification information; or the UE Usage Type in the network side access equipment information cannot be searched; or the searched target position information of the UE does not have the corresponding relation for determining the AMF identification information; or the searched UE Usage Type in the network side access equipment information does not have a corresponding relation for determining the AMF identification information; or the searched target position information of the UE and the UE Usage Type in the network side access equipment information do not have a corresponding relation for determining the AMF identification information;

at this time, the DNS system sends a request for assisting handover, and the UE Usage Type in the target location information of the UE and the network side access device information to the NRF;

correspondingly, the NRF determines the received target position information of the UE and the indication information corresponding to the UE Usage Type in the network side access equipment information and used for determining the AMF identification information according to the corresponding relation among the target position information of the UE, the UE Usage Type in the network side access equipment information and the indication information used for determining the AMF identification information stored in the NRF, and returns the indication information used for determining the AMF identification information to the DNS; after receiving the indication information for determining the AMF identification information returned by the NRF, the DNS sends the indication information for determining the AMF identification information to the MME;

optionally, the MME receives target location information of the UE returned by the DNS system and indication information corresponding to the UE Usage Type in the network side access device information and used for determining the AMF identification information, determines the AMF identification information according to the indication information used for determining the AMF identification information, determines an AMF to be switched according to the AMF identification information, and finally performs switching between the MME and the determined AMF.

In implementation, after the DNS determines that the correspondence does not exist in the DNS, the DNS sends a request for assisting handover to the NRF, and simultaneously sends the target location information of the UE and the UE Usage Type in the network side access device information to the NRF, and the NRF may determine corresponding indication information for determining the AMF identification information according to the target location information of the UE and the UE Usage Type in the network side access device information, and when it is ensured that the DNS does not store the correspondence between the target location information of the UE and the indication information for determining the AMF identification information, may also determine the corresponding indication information for determining the AMF identification information, and further determine the AMF identification information, determine the AMF according to the AMF identification information, and ensure that network handover can be performed normally.

Case two: and the MME determines corresponding AMF equipment identification information according to the target position information of the UE and the S-NSSAI in the network side access equipment information.

Optionally, when the MME determines the corresponding AMF identification information according to the target location information of the UE and the network side access device information, the MME sends the target location information of the UE and S-NSSAI in the network side access device information to the DNS system, and receives the target location information of the UE returned by the DNS system and the AMF identification information corresponding to the S-NSSAI in the network side access device information;

specifically, after the MME receives a request for network handover, the MME sends target location information of the UE and the S-NSSAI in the network side access device information to the DNS system. Correspondingly, the DNS system determines the indication information of the AMF identification information according to the received target location information of the UE from the MME and the S-NSSAI in the network side access equipment information.

In the embodiment of the present invention, after receiving the target location information of the UE and the S-NSSAI in the network side access device information sent by the MME, the DNS system queries, according to a fourth correspondence relationship between the target location information of the UE stored in the DNS system and the S-NSSAI in the network side access device information and the indication information for determining the AMF identification information, determines whether there is the received target location information of the UE and the indication information for determining the AMF identification information corresponding to the S-NSSAI in the network side access device information, and returns the AMF identification information to the MME after determining that there is the received target location information of the UE from the MME and the indication information for determining the AMF identification information corresponding to the S-NSSAI in the network side access device information; and if the received target location information of the UE from the MME and the indication information which is corresponding to the S-NSSAI in the network side access equipment information and is used for determining the AMF identification information do not exist, the DNS system sends the target location information of the UE and the S-NSSAI in the network side access equipment information to the NRF.

In the following, detailed schemes are given for the above.

Scene one: the DNS system has received target location information of the UE and indication information which is corresponding to S-NSSAI in the network side access equipment information and is used for determining AMF identification information.

Optionally, the DNS system determines, according to a fourth correspondence between the target location information of the UE, the S-NSSAI in the network side access device information, and the indication information for determining the AMF identification information, the received target location information of the UE from the MME, and the indication information for determining the AMF identification information corresponding to the S-NSSAI in the network side access device information.

Specifically, after receiving target location information of UE from MME and S-NSSAI in the network side access device information, the DNS system determines that target location information of the UE, S-NSSAI in the network side access device information, and indication information for determining AMF identification information are stored in the DNS system according to the received target location information of the UE and S-NSSAI in the network side access device information, finds the indication information for determining AMF identification information according to the received target location information of the UE and S-NSSAI in the network side access device information, and returns the found indication information for determining AMF identification information to MME;

correspondingly, the MME receives the target location information of the UE returned by the DNS system and the indication information corresponding to the S-NSSAI in the network side access device information and used for determining the AMF identification information, determines the AMF identification information according to the indication information used for determining the AMF identification information, then determines the AMF to be switched according to the AMF identification information, and finally performs the switching between the MME and the determined AMF.

In the embodiment of the present invention, when the DNS system returns information to the MME, AMF identification information may also be returned, that is, after the DNS system determines the indication information for determining the AMF identification information according to the target location information of the UE and the S-NSSAI in the network side access device information, the DNS system determines the AMF identification information according to the indication information for determining the AMF identification information, and finally returns the AMF identification information to the MME.

In implementation, because the indication information for determining the AMF identification information can be determined according to the target location information of the UE and the S-NSSAI in the network side access device information, and the indication information for determining the AMF identification information is returned to the MME, the MME can determine an accurate AMF and perform handover between the MME and the AMF.

Scene two: and the DNS system does not receive the target location information of the UE and the indication information corresponding to the S-NSSAI in the network side access equipment information and used for determining the AMF identification information.

Optionally, if the DNS system determines that the target location information of the UE from the MME and the S-NSSAI in the network side access device information are not received, the DNS system sends the target location information of the UE and the S-NSSAI in the network side access device information to the NRF, and returns the received target location information of the UE from the NRF and the indication information corresponding to the S-NSSAI in the network side access device information and used for determining the AMF identification information to the MME;

specifically, after receiving the target location information of the UE from the MME and the S-NSSAI in the network side access device information, the DNS system determines that the target location information of the UE, the S-NSSAI in the network side access device information, and the indication information for determining the AMF identification information are stored in the DNS system itself according to the received target location information of the UE and the S-NSSAI in the network side access device information, and when searching for the indication information for determining the AMF identification information according to the received target location information of the UE and the S-NSSAI in the network side access device information, the DNS system may not search for the target location information of the received UE when searching for the indication information for determining the AMF identification information, and when searching for the indication information, the DNS system may not search for the target location information of the UE; or S-NSSAI in the network side access equipment information cannot be searched; or the searched target position information of the UE does not have the corresponding relation for determining the AMF identification information; or searching the S-NSSAI in the network side access equipment information, but not corresponding to the S-NSSAI for determining the AMF identification information; or searching the target position information of the UE and the S-NSSAI in the network side access equipment information, but not having the corresponding relation for determining the AMF identification information;

at this time, the DNS system sends a request for assisting switching, and target location information of UE and S-NSSAI in network side access equipment information to the NRF;

correspondingly, the NRF determines the received target position information of the UE and the indication information corresponding to the S-NSSAI in the network side access equipment information and used for determining the AMF identification information according to the corresponding relation of the target position information of the UE, the S-NSSAI in the network side access equipment information and the indication information used for determining the AMF identification information stored by the NRF, and returns the indication information used for determining the AMF identification information to the DNS; after receiving the indication information for determining the AMF identification information returned by the NRF, the DNS sends the indication information for determining the AMF identification information to the MME;

optionally, the MME receives target location information of the UE returned by the DNS system and indication information corresponding to the S-NSSAI in the network side access device information and used for determining the AMF identification information, determines the AMF identification information according to the indication information used for determining the AMF identification information, determines an AMF that needs to be switched according to the AMF identification information, and finally performs switching between the MME and the determined AMF.

In implementation, after the DNS determines that the correspondence does not exist in itself, the DNS sends a request for assisting handover to the NRF, simultaneously, the target position information of the UE and the S-NSSAI in the network side access equipment information are sent to the NRF, further, the NRF may determine corresponding indication information for determining the AMF identification information according to the target location information of the UE and the S-NSSAI in the network side access device information, so as to ensure that when the DNS does not store the corresponding relationship between the target location information of the UE, the S-NSSAI in the network side access device information, and the indication information for determining the AMF identification information, and the corresponding indication information for determining the AMF identification information, and further determining the AMF identification information, and determining the AMF according to the AMF identification information to ensure that the network switching can be normally carried out.

In the above embodiment, if the MME receives a plurality of AMF identification information, one of the plurality of AMF identification information is selected;

and when the MME and the AMF corresponding to the AMF identification information perform the switching process of the terminal, the MME and the AMF corresponding to the selected AMF identification information perform the switching process of the terminal.

Specifically, when a plurality of pieces of AMF identification information are received, one piece of AMF identification information corresponds to one AMF, so that a plurality of AMFs to which switching can be performed during switching can be determined according to the received plurality of pieces of AMF identification information, but when switching is performed, one MME can only perform switching with one AMF, so that one piece of AMF identification information needs to be selected from the plurality of pieces of AMF identification information, and then the corresponding AMF during switching is determined according to the selected AMF identification information, and then switching between the MME and the AMF is performed.

In implementation, when a plurality of AMF information identifiers are received, it is described that the MME may perform handover with a plurality of AMFs, but only one AMF identifier information may be selected to determine a corresponding AMF from the plurality of AMFs and perform handover with the determined AMF to ensure normal handover.

In this embodiment of the present invention, there is another implementation manner, that is, the MME sends a request for obtaining AMF identifier information to the DNS, and the DNS returns information related to the AMF identifier information stored in the DNS to the MME after receiving the request sent by the AMF, where the information returned by the DNS may be a correspondence between target location information of the UE and indication information used to determine the AMF identifier information, or a correspondence between target location information of the UE, UE usable Type in network side access device information and indication information used to determine the AMF identifier information, or a correspondence between target location information of the UE, S-NSSAI in network side access device information and indication information used to determine the AMF identifier information, and when the MME receives the correspondence returned by the DNS, according to the target location information of the UE determined by the MME, or the target location information of the UE, the indication information of the AMF identifier information, and the indication information used to determine the AMF identifier information, where the MME receives the correspondence returned by the MME, And determining corresponding indication information for determining AMF identification information by using the UE Usage Type in the network side access equipment information, or target location information of the UE and S-NSSAI in the network side access equipment information, and then selecting one AMF identification information from the indication information for determining the AMF identification information to enable the MME and the AMF corresponding to the AMF identification information to perform the switching process of the terminal.

As shown in fig. 10, a schematic structural diagram of a fifth apparatus for performing network handover provided in the present application includes a processor 1000 and a transceiver 1001:

the processor 1000 is configured to: determining corresponding AMF identification information according to the target position information of the UE, or determining corresponding AMF identification information according to the target position information of the UE and the network side access equipment information; and the AMF corresponding to the AMF identification information performs the switching process of the terminal.

Optionally, the processor 1000 is specifically configured to: and sending the target location information of the UE to a DNS (domain name system), and receiving AMF (access gateway) identification information corresponding to the target location information of the UE returned by the DNS.

Optionally, the processor 1000 is specifically configured to:

sending target position information of UE and UE Usage Type in the network side access equipment information to a DNS system, and receiving the target position information of the UE returned by the DNS system and AMF identification information corresponding to the UE Usage Type in the network side access equipment information; or

And sending the target location information of the UE and the S-NSSAI in the network side access equipment information to a DNS system, and receiving the target location information of the UE returned by the DNS system and AMF identification information corresponding to the S-NSSAI in the network side access equipment information.

Optionally, the processor 1000 is further configured to:

if receiving a plurality of AMF identification information, selecting one from the AMF identification information; and the AMF corresponding to the selected AMF identification information performs the switching process of the terminal.

As shown in fig. 11, a sixth apparatus for performing network handover provided by the present application includes: at least one processing unit 1100 and at least one storage unit 1101, wherein the storage unit 1101 stores program code that, when executed by the processing unit 1100, causes the processing unit 1100 to perform the steps of any method of MME handover in a network handover procedure.

As shown in fig. 12, a schematic structural diagram of a seventh apparatus for performing network handover provided in the present application is shown, where the apparatus includes a processor 1200 and a transceiver 1201:

the processor 1200 is configured to: according to the received target position information of the UE from the MME, determining the indication information for determining the AMF identification information, or according to the received target position information of the UE from the MME and the network side access equipment information, determining the indication information for determining the AMF identification information; and returning at least one piece of AMF identification information in the indication information for determining the AMF identification information to the MME.

Optionally, the processor 1200 is specifically configured to: and determining the indication information for determining the AMF identification information corresponding to the received target location information of the UE from the MME according to the second corresponding relation between the target location information of the UE and the indication information for determining the AMF identification information.

Optionally, the processor 1200 is specifically configured to:

determining the received target position information of the UE from the MME and the indication information which is corresponding to the UE Usage Type in the network side access equipment information and is used for determining the AMF identification information according to the third corresponding relation among the target position information of the UE, the UE Usage Type in the network side access equipment information and the indication information used for determining the AMF identification information; or

And determining the received target location information of the UE from the MME and the indication information which is corresponding to the S-NSSAI in the network side access equipment information and is used for determining the AMF identification information according to the fourth corresponding relation of the target location information of the UE, the S-NSSAI in the network side access equipment information and the indication information used for determining the AMF identification information.

Optionally, the processor 1200 is further configured to:

and if the target location information of the UE from the MME is determined not to be received, sending the target location information of the UE to the NRF, and returning indication information which is used for determining AMF identification information and corresponds to the received target location information of the UE from the NRF to the MME.

Optionally, the processor 1200 is further configured to:

if the target position information of the UE from the MME and the UE Usage Type in the network side access equipment information are determined not to be received, sending the target position information of the UE and the UE Usage Type in the network side access equipment information to the NRF, and returning the received target position information of the UE from the NRF and the indication information which is corresponding to the UE Usage Type in the network side access equipment information and is used for determining the AMF identification information to the MME; or

And if the target position information of the UE from the MME and the S-NSSAI in the network side access equipment information are determined not to be received, sending the target position information of the UE and the S-NSSAI in the network side access equipment information to the NRF, and returning the received indication information which is used for determining the AMF identification information and corresponds to the target position information of the UE from the NRF and the S-NSSAI in the network side access equipment information to the MME.

As shown in fig. 13, an eighth apparatus for performing network handover provided by the present application includes: at least one processing unit 1300 and at least one storage unit 1301, wherein the storage unit 1301 stores program code, and when the program code is executed by the processing unit 1300, the program code causes the processing unit 1300 to execute the steps of any method of the DNS system at the time of switching in the network switching process.

As shown in fig. 14, a flowchart of a method for performing network handover provided by the present application specifically includes the following steps:

step 1400, the MME determines corresponding AMF identification information according to the target location information of the UE, or determines corresponding AMF identification information according to the target location information of the UE and the network side access device information; step 1401, the MME and the AMF corresponding to the AMF identification information perform a handover procedure of the terminal.

Optionally, when the MME determines corresponding AMF identification information according to target location information of the UE and network side access device information, the MME sends the target location information of the UE and a UE Usage Type in the network side access device information to the DNS system, and receives the target location information of the UE returned by the DNS system and the AMF identification information corresponding to the UE Usage Type in the network side access device information; or

And the MME sends the target position information of the UE and the S-NSSAI in the network side access equipment information to a DNS system, and receives the target position information of the UE returned by the DNS system and the AMF identification information corresponding to the S-NSSAI in the network side access equipment information.

Optionally, when the MME determines the corresponding AMF identification information, if the MME receives multiple AMF identification information, selecting one from the multiple AMF identification information;

As shown in fig. 15, a flowchart of a method for performing network handover provided by the present application specifically includes the following steps:

step 1500, the DNS system determines the indication information for determining the AMF identification information according to the received target location information of the UE from the MME, or determines the indication information for determining the AMF identification information according to the received target location information of the UE from the MME and the network side access device information;

in step 1501, the DNS system returns at least one piece of AMF identification information in the indication information for determining the AMF identification information to the MME.

Optionally, when the DNS system determines, according to the received target location information of the UE and the network side access device information from the MME, the indication information for determining the AMF identification information, the DNS system determines, according to a third corresponding relationship between the target location information of the UE, the UE Usage Type in the network side access device information, and the indication information for determining the AMF identification information, the received target location information of the UE from the MME and the indication information for determining the AMF identification information corresponding to the UE Usage Type in the network side access device information; or

Optionally, if the DNS system determines that the target location information of the UE from the MME and the UE Usage Type in the network side access device information are not received, the DNS system sends the target location information of the UE and the UE Usage Type in the network side access device information to the NRF, and returns the received indication information for determining the AMF identification information, which corresponds to the target location information of the UE from the NRF and the UE Usage Type in the network side access device information, to the MME; or

And if the DNS system determines that the target location information of the UE from the MME and the S-NSSAI in the network side access equipment information are not received, sending the target location information of the UE and the S-NSSAI in the network side access equipment information to the NRF, and returning the received indication information which is used for determining the AMF identification information and corresponds to the target location information of the UE from the NRF and the S-NSSAI in the network side access equipment information to the MME.

The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.

Accordingly, the subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for performing a network handover, the method comprising:

receiving a switching request sent by a terminal by an Access Management Function (AMF), wherein the switching request is sent after the terminal determines that network switching is required according to target position information of User Equipment (UE);

the AMF sends the target position information of the UE and the network side access equipment information of the UE in the switching request to network function management equipment, and receives corresponding mobile management function (MME) equipment identification information returned by the network function management equipment;

the AMF and the MME corresponding to the MME equipment identification information perform the switching process of the terminal;

if the network side access device includes a user Usage Type UE, before the AMF determines corresponding mobility management function MME device identification information according to target location information of the user UE and network side access device information of the UE, the method further includes:

the AMF sends a UE signed S-NSSAI to the data management equipment;

2. The method of claim 1, wherein the network side access device information of the UE includes some or all of:

the user Usage Type UE Usage Type, the AMF belonging access management Region AMF Region identification information, the AMF belonging access management position AMF Set identification information and the network slice selection auxiliary information S-NSSAI.

3. The method of claim 1, wherein the UE Usage Type received by the AMF is determined by the data management according to a first correspondence of the S-NSSAI signed by the UE to the UE Usage Type.

4. A method for performing a network handover, the method comprising:

network function management equipment receives target position information of user UE and network side access equipment information of the UE, wherein the target position information of the UE is determined by the AMF based on a switching request which is determined by a terminal according to the target position information of the UE and is sent after the network switching is required;

the network function management equipment determines the received target position information of the UE from the AMF and MME equipment identification information corresponding to the network side access equipment information of the UE according to a second corresponding relation of the target position information of the UE, the network side access equipment information of the UE and the MME equipment identification information, wherein if the network side access equipment comprises a user Usage Type UE, the UE Usage Type is the UE Usage Type corresponding to S-NSSAI acquired from data management equipment after the AMF sends UE signed S-NSSAI to the data management equipment;

5. The method of claim 4, further comprising:

and the network function management equipment returns default MME equipment identification information to the AMF after the corresponding MME equipment identification information cannot be determined according to the second corresponding relation.

6. A method for performing a network handover, the method comprising:

after receiving a request for network switching, an MME sends target location information to a DNS (domain name system), or sends target location information of UE (user equipment) and network side access equipment information to the DNS, and receives corresponding AMF identification information returned by the DNS, wherein the AMF identification information is determined by the DNS based on indication information for determining the AMF identification information and sent to the MME, and the indication information for determining the AMF identification information is determined by the DNS after determining that the target location information is stored in the DNS, or determined after determining that the target location information and the network side equipment access information are stored in the DNS, or obtained from NRF after determining that the target location information and the network side access equipment information are not stored in the DNS;

and the MME and the AMF corresponding to the AMF identification information perform the switching process of the terminal.

7. The method of claim 6, wherein the MME determines corresponding AMF identification information according to the target location information of the UE and the network side access device information, and the determining comprises:

the MME sends target position information of UE and UE Usage Type in the network side access equipment information to a DNS system, and receives the target position information of the UE returned by the DNS system and AMF identification information corresponding to the UE Usage Type in the network side access equipment information; or

8. The method of any of claims 6 to 7, wherein the MME determines corresponding AMF identification information, further comprising:

if the MME receives a plurality of pieces of AMF identification information, selecting one piece of AMF identification information from the plurality of pieces of AMF identification information;

the switching process of the terminal is carried out by the MME and the AMF corresponding to the AMF identification information, and comprises the following steps:

and the MME and the AMF corresponding to the selected AMF identification information perform the switching process of the terminal.

9. A method for performing a network handover, the method comprising:

a domain name system DNS system receives the target position information of UE sent after the MME determines that network switching is required, or the sent target position information according to the UE and the network side access equipment information;

a Domain Name System (DNS) system determines indicating information for determining AMF identification information according to target position information of the UE, or determines indicating information for determining AMF identification information according to the target position information of the UE and the network side access equipment information, wherein the indicating information for determining AMF identification information is determined after the DNS system determines that the target position information is stored in the DNS system, or determined after the DNS system determines that the target position information and the network side equipment access information are stored in the DNS system, or acquired from NRF after the DNS system determines that the target position information and the network side access equipment information are not stored in the DNS system;

and the DNS system returns at least one piece of AMF identification information in the indication information for determining the AMF identification information to the MME.

10. The method of claim 9, wherein the DNS system determining the indication of the AMF identity information based on receiving the target location information of the UE from the MME, comprises:

and the DNS system determines the indication information for determining the AMF identification information corresponding to the received target location information of the UE from the MME according to the second corresponding relation between the target location information of the UE and the indication information for determining the AMF identification information.

11. The method of claim 9, wherein the DNS system determining the indication information for determining the AMF identification information according to the target location information and the network side access device information received from the MME according to the UE comprises:

the DNS system determines the received target position information of the UE from the MME and the indication information which is used for determining the AMF identification information and corresponds to the UE Usage Type in the network side access equipment information according to the third corresponding relation among the target position information of the UE, the UE Usage Type in the network side access equipment information and the indication information used for determining the AMF identification information; or

12. The method of claim 10, further comprising:

and if the DNS system determines that the target location information of the UE from the MME is not received, the DNS system sends the target location information of the UE to the NRF, and returns indication information which is used for determining AMF identification information and corresponds to the received target location information of the UE from the NRF to the MME.

13. The method of claim 11, further comprising:

if the DNS system determines that the target position information of the UE from the MME and the UE Usage Type in the network side access equipment information are not received, the DNS system sends the target position information of the UE and the UE Usage Type in the network side access equipment information to the NRF, and returns the received target position information of the UE from the NRF and the indication information which is corresponding to the UE Usage Type in the network side access equipment information and is used for determining the AMF identification information to the MME; or

14. An apparatus for performing a network handover, the apparatus comprising: a processor and a transceiver:

the processor is configured to: receiving a switching request sent by a terminal, wherein the switching request is sent after the terminal determines that network switching is needed according to target position information of user UE; sending the target position information of the UE and the network side access equipment information of the UE in the switching request to network function management equipment, and receiving corresponding MME equipment identification information returned by the network function management equipment; the MME corresponding to the MME equipment identification information performs the switching process of the terminal;

if the network side access device includes a user Usage Type UE, the processor is further configured to, before determining corresponding mobility management function MME device identification information according to target location information of the user UE and network side access device information of the UE: sending S-NSSAI signed by UE to the data management equipment; and receiving the UE Usage Type corresponding to the S-NSSAI returned by the data management equipment.

15. The apparatus of claim 14, wherein the network side access device information of the UE comprises some or all of:

the user Usage Type UE Usage Type, the AMF Region identification information of the AMF, the AMF Set identification information of the AMF, and the network slice selection auxiliary information S-NSSAI.

16. The device of claim 14, wherein the UE Usage Type received by the processor is determined by the data management based on a first correspondence of the S-NSSAI signed by the UE to the UE Usage Type.

17. An apparatus for performing a network handover, the apparatus comprising: a processor and a transceiver:

the processor is configured to: receiving target position information of User Equipment (UE) and network side access equipment information of the UE, wherein the target position information of the UE is determined by a switching request which is sent after the AMF determines that network switching needs to be carried out based on the target position information of the UE; determining received UE target position information from the AMF and MME equipment identification information corresponding to the UE network side access equipment information according to the second corresponding relation of the UE target position information, the UE network side access equipment information and the MME equipment identification information; returning the MME equipment identification information to the AMF;

if the network side access device comprises a user Usage Type UE, wherein the UE Usage Type is a UE Usage Type corresponding to an S-NSSAI acquired from a data management device after the AMF sends a UE subscription to the data management device.

18. The device of claim 17, wherein the processor is further configured to:

19. An apparatus for performing a network handover, the apparatus comprising: a processor and a transceiver:

the processor is configured to: after receiving a request for network switching, sending target location information of UE to a DNS (domain name system), or sending the target location information of the UE and network side access equipment information to the DNS, and receiving corresponding AMF (advanced mobile switching) identification information returned by the DNS; the AMF corresponding to the AMF identification information performs the switching process of the terminal;

the AMF identification information is determined by a DNS system based on indication information used for determining the AMF identification information and is sent to the MME, and the indication information used for determining the AMF identification information is determined by the DNS system after the DNS system determines that the target location information is stored in the DNS system, or determined after the DNS system determines that the target location information and the network side equipment access information are stored in the DNS system, or acquired from NRF after the DNS system determines that the target location information and the network side access equipment information are not stored in the DNS system.

20. The device of claim 19, wherein the processor is further configured to:

21. The apparatus of any of claims 19 to 20, wherein the processor is further configured to:

22. An apparatus for performing a network handover, the apparatus comprising: a processor and a transceiver:

the processor is configured to: receiving target position information of UE (user equipment) sent by an MME (mobility management entity) after the MME determines that network switching is required, or sending the target position information and network side access equipment information according to the UE; according to the target position information of the UE, determining indicating information for determining AMF identification information, or according to the target position information of the UE and the network side access equipment information, determining the indicating information for determining the AMF identification information, wherein the indicating information for determining the AMF identification information is determined after a DNS system determines that the target position information is stored in the DNS system, or determined after the DNS system determines that the target position information and the network side equipment access information are stored in the DNS system, or acquired from NRF after the DNS system determines that the target position information and the network side access equipment information are not stored in the DNS system;

and returning at least one piece of AMF identification information in the indication information for determining the AMF identification information to the MME.

23. The device of claim 22, wherein the processor is specifically configured to:

and determining the indication information for determining the AMF identification information corresponding to the received target location information of the UE from the MME according to the second corresponding relation between the target location information of the UE and the indication information for determining the AMF identification information.

24. The device of claim 22, wherein the processor is specifically configured to:

25. The device of claim 23, wherein the processor is further configured to:

26. The device of claim 24, wherein the processor is further configured to:

27. An apparatus for performing a network handover, the apparatus comprising: at least one processing unit and at least one memory unit, wherein the memory unit stores program code which, when executed by the processing unit, causes the processing unit to perform the steps of the method of any of claims 1 to 3 or 4 to 5 or 6 to 8 or 9 to 13.

28. A computer-readable storage medium comprising program code means for causing a computing device to carry out the steps of the method as claimed in any one of claims 1 to 3 or 4 to 5 or 6 to 8 or 9 to 13 when said program code is run on said computing device.