CN112105014B

CN112105014B - Method, device, system and equipment for interoperation of 4G and 5G networks

Info

Publication number: CN112105014B
Application number: CN201910519025.5A
Authority: CN
Inventors: 聂衡; 毛聪杰; 朱雪田
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2019-06-17
Filing date: 2019-06-17
Publication date: 2023-06-20
Anticipated expiration: 2039-06-17
Also published as: CN112105014A

Abstract

The present disclosure relates to a method, apparatus, system, device and storage medium for interoperating 4G and 5G networks. The method for interoperating the 4G network and the 5G network is applied to the situation that User Equipment (UE) moves from the 4G network to the 5G network, and comprises the following steps: the authentication management function AMF obtains first information of the UE from a mobile management entity MME, wherein the first information carries a service gateway SGW address; according to the SGW address, obtaining an interface address between the AMF and second network equipment from first network equipment, wherein the second network equipment comprises a session management function SMF and SGW which are combined; and connecting with the SMF of the second network device according to the interface address between the AMF and the second network device.

Description

Method, device, system and equipment for interoperation of 4G and 5G networks

Technical Field

The disclosure relates to the technical field of mobile communication, and in particular relates to a method, a device, a system, equipment and a storage medium for interoperating a 4G network and a 5G network.

Background

In the process of interoperation of related art 4G and 5G networks, more switching delay and routing detour exist, which not only results in reduced user experience, but also increases network deployment investment. This problem is particularly pronounced in roaming situations.

Disclosure of Invention

The present disclosure provides a method, apparatus, system, device, and storage medium for interoperating 4G and 5G networks.

According to one aspect of the present disclosure, there is provided a method for interoperating a 4G and 5G network, which is applied in a case that a UE (User Equipment) moves from the 4G network to the 5G network, the method including:

the AMF (Access and Mobility Management Function ) obtains first information of the UE from the MME (Mobility Management Entity ), the first information carrying an SGW (Serving Gateway) address;

according to the SGW address, obtaining an interface address between the AMF and second network equipment from first network equipment, wherein the second network equipment comprises a combined SMF (Session Management Function ) and SGW;

and connecting with the SMF of the second network equipment according to the interface address between the AMF and the second network equipment.

According to one aspect of the present disclosure, there is provided an apparatus for interoperating a 4G and 5G network, for use in a case where a UE moves from the 4G network to the 5G network, the apparatus comprising:

a first obtaining unit, configured to obtain first information of a UE from an MME, where the first information carries an SGW address;

a second obtaining unit, configured to obtain, from the first network device, an interface address between the AMF and a second network device according to the SGW address, where the second network device includes a SMF and a SGW that are set together;

and the connection unit is used for connecting with the SMF of the second network equipment according to the interface address between the AMF and the second network equipment.

According to another aspect of the present disclosure, there is provided a method of interoperating a 4G and 5G network, applied in a case where a UE moves from the 5G network to the 4G network, the method comprising:

the AMF sends a PDU (Protocol Data Unit ) session information acquisition request to the SMF of the second network device, wherein the second network device comprises an SGW in addition to the SMF, and the SGW is combined with the SMF;

receiving PDU session information returned by SMF of the second network equipment, wherein the PDU session information carries SGW address;

and sending second information carrying the SGW address to the MME.

According to another aspect of the present disclosure, there is provided an apparatus for interoperating a 4G and 5G network, for use in a case where a UE moves from the 5G network to the 4G network, the apparatus comprising:

a request unit, configured to send an acquisition request of PDU session information to an SMF of a second network device, where the second network device includes an SGW in addition to the SMF, where the SGW is configured in combination with the SMF;

a receiving unit, configured to receive PDU session information returned by the SMF of the second network device, where the PDU session information carries an SGW address;

and the sending unit is used for sending the second information carrying the SGW address to the MME. According to yet another aspect of the present disclosure, there is provided a system for interoperating a 4G and 5G network, comprising an MME, an AMF, a first network device, and a second network device, wherein:

the second network equipment comprises a SMF and an SGW which are jointly arranged;

the AMF is used for obtaining first information carrying SGW addresses of the UE from the MME; obtaining an interface address between the AMF and the second network device from the first network device according to the SGW address; according to the interface address between the AMF and the second network equipment, connecting with the SMF; and an acquisition request for transmitting PDU session information to the SMF; receiving PDU session information carrying SGW address returned by SMF; and sending second information carrying the SGW address to the MME.

According to yet another aspect of the present disclosure, there is provided a 4G and 5G network interoperable device, comprising:

a memory; and a processor coupled to the memory, the processor configured to perform the method of 4G and 5G network interoperability of any of the preceding claims based on instructions stored in the memory.

According to yet another aspect of the present disclosure, there is provided a computer readable storage medium having stored thereon a computer program which when executed by a processor implements a method of interoperating a 4G and 5G network of any of the preceding claims.

According to the technical scheme, switching time delay and routing detour during the interoperation of the 4G network and the 5G network can be reduced, user experience is improved, and network deployment cost is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The disclosure will be understood more clearly from the following detailed description, with reference to the accompanying drawings,

wherein:

FIG. 1 is a flow chart of a method of interoperating 4G and 5G networks of some embodiments of the present disclosure;

FIG. 2 is a flow chart of a method of interoperating 4G and 5G networks according to further embodiments of the present disclosure;

FIG. 3 is a flow chart of a method of interoperating a further embodiment 4G and 5G network of the present disclosure;

FIG. 4 is a block diagram of an apparatus for interoperating a 4G and 5G network of some embodiments of the present disclosure;

FIG. 5 is a flow chart of a method of interoperating 4G and 5G networks of some embodiments of the present disclosure;

FIG. 6 is a flow chart of a method of interoperating 4G and 5G networks according to further embodiments of the present disclosure;

FIG. 7 is a flow chart of a method of interoperating a further embodiment 4G and 5G network of the present disclosure;

FIG. 8 is a block diagram of an apparatus for interoperating a 4G and 5G network of some embodiments of the present disclosure;

FIG. 9 is a block diagram of a system for interoperation of some embodiments 4G and 5G networks of the present disclosure;

FIG. 10 is a block diagram of some embodiments 4G and 5G network interoperable devices of the present disclosure;

FIG. 11 is a block diagram of a computer system according to some embodiments of the present disclosure.

It should be understood that the dimensions of the various elements shown in the figures are not drawn to actual scale. Further, the same or similar reference numerals denote the same or similar members.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative, and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of the components and steps set forth in these embodiments should be construed as exemplary only and not as limiting unless specifically stated otherwise.

All terms (including technical or scientific terms) used in this disclosure have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

The inventor of the application finds that when the related art 4G and the 5G network interoperate in the process of implementing the embodiment of the disclosure, more switching delay and routing detours exist among the AMF, the SMF and the SGW, which not only results in reduced user experience, but also increases network deployment investment. This problem is particularly pronounced in roaming situations.

To solve this problem, embodiments of the present disclosure provide a method, apparatus, system, device, and storage medium for interoperating 4G and 5G networks.

Wherein 4G interoperation with 5G networks includes roaming and non-roaming scenarios where a UE moves from a 4G network to a 5G network and from a 5G network to a 4G network. In each case, the interoperable content includes location update and handover.

Registration in a new location area is required when a UE moves from one location area to another, and once the UE changes from the received LAI (Location Area Identity ) in its memory to the received LAl of the current cell for some need or discovery, a location update procedure is initiated informing the network to change the location information it stores.

When a UE that is using network services moves from one cell to another, the UE needs to initiate a handover procedure to perform channel handover in order to ensure continuity of communication.

In a network architecture of 4G and 5G interworking, an MME is responsible for mobility management, bearer management, user authentication, SGW and PGW (PDN Gateway) selection, etc. The SGW is responsible for user plane processing, including data packet routing and forwarding, as a handoff anchor for different access networks of the 3 GPP. The PGW, acting as an anchor point for 3GPP (Third Generation Partnership Project ) access and non-3 GPP access to PDN (Packet Data Network, public data network), interacts with the SGW to provide session management and bearer control, data forwarding, IP address allocation, and non-3 GPP user access for the user. The AMF is responsible for access rights and handover of the UE, etc. The SMF is responsible for session management, providing service continuity, uninterrupted user experience of the service.

Fig. 1 is a flow chart illustrating a method of interoperating a 4G and 5G network of some embodiments of the present disclosure.

As shown in fig. 1, the method for interoperating a 4G network and a 5G network is applied in a case where a UE moves from the 4G network to the 5G network, and includes the following steps S101 to S103.

In step S101, the AMF obtains first information of the UE from the MME, the first information carrying the SGW address.

The first information may carry, in addition to the SGW address, a TEID (Tunnel End Point Identifier, tunnel endpoint identification) and SM (Session Management ) context.

When the UE moves from the 4G network to the 5G network to initiate the location update, the first information is the context of the UE, and step S101 may include the following sub-steps:

step one, AMF sends a UE context acquisition request to MME when receiving a position update request of UE moving from a 4G network to a 5G network;

and step two, receiving the context of the UE returned by the MME.

When the UE moves from the 4G network to the 5G network to initiate handover, the foregoing first information is a forward relocation request, and step S101 may include:

the AMF receives a forward relocation request sent by the MME when receiving a handover request of the UE moving from the 4G network to the 5G network.

In step S102, the AMF obtains, from the first network device, an interface address between the AMF and the second network device, according to the SGW address, the second network device including the combined SMF and SGW.

The combination is relative to the split. The SMF and the SGW are combined, so that the second network equipment can be used as a single network element to realize the SMF function and the SGW function, thereby simplifying interaction among the AMF, the SMF and the SGW.

In step S103, the AMF connects with the SMF of the second network device according to the obtained interface address between the AMF and the second network device. After the connection is established, the SMF can directly perform resource mapping with the SGW inside the second network device.

After step S103, the subsequent location update or handover procedure continues to be completed.

In the above embodiment of the present disclosure, the SMF and the SGW are integrally provided in the second network device, and the second network device, as a single network element, may implement both the SMF function and the SGW function, so as to simplify interaction among the AMF, the SMF, and the SGW, reduce switching delay and routing detour, improve user experience, and reduce network deployment cost. The embodiment scheme is particularly suitable for roaming of the UE in a home routing mode, and can effectively reduce switching time delay and routing detour between SMF and user plane functions.

In some embodiments, the first network device includes a separate DNS (Domain Name System ) and NRF (NF Repository Function, network storage function). Wherein DNS serves as a distributed database mapping domain names and SGW addresses to each other. The NRF is responsible for network function service registration, status monitoring, etc., thereby realizing automatic management, selection, and scalability of network function services.

In these embodiments, the step S102 may include the following sub-steps:

step one, a domain name query request carrying an SGW address is sent to a DNS;

step two, receiving a domain name corresponding to the SGW address returned by the DNS;

step three, sending an interface address query request carrying the domain name to the NRF;

and step four, receiving an interface address between the AMF returned by the NRF and the second network equipment.

In other embodiments, the first network device includes a co-located DNS and NRF. The step S102 may include the following sub-steps:

step one, a domain name query request carrying an SGW address is sent to a DNS;

and step two, receiving an interface address between the AMF and the second network equipment from the NRF, wherein the interface address between the AMF and the second network equipment is obtained by inquiring a domain name corresponding to the SGW address sent by the DNS by the NRF.

The DNS and the NRF are combined, so that the flow for acquiring the interface address can be simplified, and a basis is provided for signaling optimization and route optimization of the 4G and 5G network interoperation.

In the above embodiment, the domain name is preferably a fully qualified domain name (Fully Qualified Domain Name, FQDN), including the host name and the domain name where the host is located, so that the location of the host in the domain name tree can be accurately known logically.

Fig. 2 is a flow chart illustrating a method of interoperating a 4G and 5G network of other embodiments of the present disclosure. The method for interoperating between the 4G and the 5G networks of this embodiment is applied to a location update procedure for moving the UE from the 4G network to the 5G network, and includes the following steps S201 to S205.

In step S201, the AMF sends a UE context acquisition request to the MME upon receiving a location update request for the UE to move from the 4G network to the 5G network.

In step S202, the AMF receives the UE context returned by the MME, where the UE context carries the SGW address, TEID, and SM context.

In step S203, the AMF sends a domain name query request carrying the SGW address to the DNS of the first network device.

The first network device includes a co-located DNS and NRF. And the DNS obtains a corresponding FQDN according to the SGW address query, and the NRF obtains an N11 interface address between the AMF and the second network equipment according to the FQDN query. In some embodiments, the second network device may include a co-located visited place SMF and control plane SGW.

In step S204, the AMF receives the N11 interface address returned by the first network device.

In step S205, the AMF connects with the SMF of the second network device according to the N11 interface address.

After step S205, the AMF interacts with the second network device, the second network device interacts with the control plane PGW and the home SMF, and the subsequent location update procedure is continuously completed.

Fig. 3 is a flow chart illustrating a method of interoperating a further embodiment of the present disclosure 4G and 5G network. The method for interoperating between the 4G and the 5G networks in this embodiment is applied to a handover procedure in which the UE moves from the 4G network to the 5G network, and includes the following steps S301 to S304.

In step S301, the AMF receives a forward relocation request sent by the MME upon receiving a handover request for the UE to move from the 4G network to the 5G network, where the forward relocation request carries the SGW address, TEID and SM context.

In step S302, the AMF sends a domain name query request carrying the SGW address to the DNS of the first network device.

In step S303, the AMF receives the N11 interface address returned by the first network device.

In step S304, the AMF connects with the SMF of the second network device according to the N11 interface address.

After step S304, the AMF interacts with the second network device, the second network device interacts with the control plane PGW and the home SMF, and the subsequent handover procedure is continuously completed.

As shown in fig. 4, some embodiments of the present disclosure further provide an apparatus for interoperating a 4G network and a 5G network, where a UE moves from the 4G network to the 5G network, the apparatus including:

a first obtaining unit 41, configured to obtain, from the MME, first information of the UE, where the first information carries an SGW address;

a second obtaining unit 42, configured to obtain, from the first network device, an interface address between the AMF and a second network device according to the SGW address, where the second network device includes a combined SMF and SGW;

a connection unit 43, configured to connect with the SMF of the second network device according to an interface address between the AMF and the second network device.

Similarly, the device for interoperating the 4G network and the 5G network simplifies interaction among the AMF, the SMF and the SGW, so that switching delay and routing roundabout are reduced, user experience is improved, network deployment cost is reduced, and the device is particularly suitable for roaming situations.

Fig. 5 is a flow chart illustrating a method of interoperating a 4G and 5G network of some embodiments of the present disclosure.

As shown in fig. 5, the method for interoperating 4G and 5G networks is applied in the case that the UE moves from the 5G network to the 4G network, and includes the following steps S501-S503.

In step S501, the AMF sends an acquisition request of PDU session information to the SMF of the second network device, where the second network device includes an SGW in addition to the SMF, where the SGW is co-located with the SMF.

In step S502, the AMF receives PDU session information returned by the SMF of the second network device, where the PDU session information carries an SGW address.

In step S503, the AMF sends second information carrying the SGW address to the MME.

The PDU session information and the second information may carry TEID and SM context in addition to SGW address.

In some embodiments, when the UE moves from the 5G network to the 4G network to initiate a location update, step S501 includes:

and when receiving the UE context acquisition request sent by the MME, the AMF sends an acquisition request of PDU session information to the SMF of the second network equipment.

Wherein the UE context acquisition request is sent by the MME upon receipt of a location update request for the UE to move from the 5G network to the 4G network.

Accordingly, in step S503, the second information is the context of the UE.

In some embodiments, when the UE moves from the 5G network to the 4G network to initiate a handover, step S501 includes:

the AMF sends a request for acquiring PDU session information to the SMF of the second network device when receiving a handover request for the UE to move from the 5G network to the 4G network.

Accordingly, in step S503, the second information is a relocation request.

In the above embodiment of the present disclosure, the SMF and the SGW are integrally provided in the second network device, and the second network device, as a single network element, may implement both the SMF function and the SGW function, so as to simplify interaction among the AMF, the SMF, and the SGW, further reduce switching delay and routing roundabout, improve user experience, reduce network deployment cost, and are particularly suitable for roaming situations.

Fig. 6 is a flow chart illustrating a method of interoperating a 4G and 5G network of other embodiments of the present disclosure.

As shown in fig. 6, the method for interoperating a 5G network in this embodiment is applied to a location update procedure for moving a UE from the 5G network to the 4G network, and includes the following steps S601 to S604.

In step S601, the AMF receives a UE context acquisition request sent by the MME.

In step S602, the AMF sends an acquisition request of PDU session information, for example, signaling nsmf_pduse_contenxtrequest, to the SMF of the second network device. The second network device includes an SGW in addition to the SMF, the SGW being co-located with the SMF.

In step S603, the AMF receives PDU session information returned by the SMF of the second network device, for example, receiving signaling nsmf_pduse_contenxtresponse, where the SGW address, TEID, and SM context are carried.

In step S604, the AMF sends the UE context carrying the SGW address, TEID and SM context to the MME.

After step S604, the MME interacts with the second network device, and the second network device interacts with the control plane PGW and the home SMF to continue to complete the subsequent location update procedure.

Fig. 7 is a flow chart illustrating a method of interoperating a further embodiment of the disclosure 4G and 5G network.

As shown in fig. 7, the method for interoperating with a 5G network according to this embodiment is applied to a handover procedure in which a UE moves from a 5G network to a 4G network, and includes the following steps S701 to S703.

In step S701, the AMF sends an acquisition request of PDU session information, for example, a signaling nsmf_pduse_contenxtrequest, to the SMF of the second network device upon receiving a handover request for the UE to move from the 5G network to the 4G network. The second network device includes an SGW in addition to the SMF, the SGW being co-located with the SMF.

In step S702, the AMF receives PDU session information returned by the SMF of the second network device, for example, receiving signaling nsmf_pduse_contenxtresponse, where the SGW address, TEID, and SM context are carried.

In step S703, the AMF sends a relocation request carrying the SGW address, TEID and SM context to the MME.

After step S703, the MME interacts with the second network device, and the second network device interacts with the control plane PGW and the home SMF to continue to complete the subsequent handover procedure.

As shown in fig. 8, some embodiments of the present disclosure further provide an apparatus for interoperating a 4G and 5G network, where the apparatus is applied in a case where a UE moves from the 5G network to the 4G network, the apparatus including:

a request unit 81, configured to send an acquisition request of PDU session information to an SMF of a second network device, where the second network device includes an SGW in addition to the SMF, where the SGW is configured with the SMF;

a receiving unit 82, configured to receive PDU session information returned by the SMF of the second network device, where the PDU session information carries an SGW address;

a sending unit 83, configured to send the second information carrying the SGW address to the MME.

Similarly, the device for interoperating the 4G network and the 5G network simplifies interaction among the AMF, the SMF and the SGW, so that switching delay and routing roundabout are reduced, user experience is improved, and network deployment cost is reduced.

As shown in fig. 9, some embodiments of the present disclosure further provide a system for interoperating a 4G and 5G network, including an MME 91, an AMF 92, a first network device 93, and a second network device 94, wherein:

the second network device comprises a combined SMF and SGW;

In some embodiments, the first network device 93 includes a co-located DNS and NRF; the AMF is used for sending a domain name query request carrying an SGW address to the DNS; and receiving an interface address between the AMF and the second network equipment from the NRF, wherein the interface address between the AMF and the second network equipment is obtained by inquiring the DN corresponding to the SGW address sent by the DNS by the NRF.

The system for interoperating the 4G network and the 5G network performs enhancement processing on the 5G core network, and does not influence the 4G core network. When the position is updated or switched, the switching time delay and the routing detour are less, so that the user experience is improved, and the network deployment cost is reduced.

As shown in fig. 10, at least one embodiment of the present disclosure further provides a 4G and 5G network interoperable device, including: memory 101 and processor 102 coupled to memory 101, processor 102 configured to perform a method of interoperating a 4G and 5G network as in any of the previous embodiments based on instructions stored in memory 101.

It should be appreciated that the various steps in the aforementioned methods of interoperating 4G and 5G networks may be implemented by a processor, and may be implemented by any of software, hardware, firmware, or a combination thereof.

In addition to the methods, apparatus of interoperation of 4G and 5G networks described above, embodiments of the present disclosure may also take the form of a computer program product embodied on one or more non-volatile storage media containing computer program instructions. Accordingly, at least one embodiment of the present disclosure also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of interoperating a 4G and 5G network according to any of the preceding claims.

FIG. 11 illustrates a schematic diagram of a computer system in accordance with at least one embodiment of the present disclosure.

As shown in FIG. 11, a computer system may be embodied in the form of a general purpose computing device that may be used to implement the apparatus of the 4G and 5G network interoperability of the embodiments described above. The computer system includes a memory 111, a processor 112, and a bus 110 that connects the various system components.

The memory 111 may include, for example, a system memory, a nonvolatile storage medium, and the like. The system memory stores, for example, an operating system, application programs, boot Loader (Boot Loader), and other programs. The system memory may include volatile storage media, such as Random Access Memory (RAM) and/or cache memory. The non-volatile storage medium stores, for example, instructions for performing corresponding embodiments of the display method. Non-volatile storage media include, but are not limited to, disk storage, optical storage, flash memory, and the like.

The processor 112 may be implemented as discrete hardware components such as a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gates or transistors, and the like. Accordingly, each of the modules, such as the judgment module and the determination module, may be implemented by a Central Processing Unit (CPU) executing instructions of the corresponding steps in the memory, or may be implemented by a dedicated circuit that performs the corresponding steps.

Bus 110 may employ any of a variety of bus architectures. For example, bus structures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MCA) bus, and a Peripheral Component Interconnect (PCI) bus.

The computer system may also include an input-output interface 113, a network interface 114, a storage interface 115, and the like. The input/output interface 113, the network interface 114, the storage interface 115, and the memory 111 and the processor 112 may be connected by a bus 110. The input output interface 113 may provide a connection interface for input output devices such as a display, mouse, keyboard, etc. The network interface 114 provides a connection interface for various networking devices. The storage interface 115 provides a connection interface for external storage devices such as a floppy disk, a USB flash disk, an SD card, and the like.

Thus, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concepts of the present disclosure, some details known in the art are not described. How to implement the solutions disclosed herein will be fully apparent to those skilled in the art from the above description.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that the foregoing embodiments may be modified and equivalents substituted for elements thereof without departing from the scope and spirit of the disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A method of interoperating a 4G and 5G network, the method comprising:

in case of application to a user equipment UE moving from a 4G network to a 5G network,

the method comprises the steps that an access and mobility management function AMF obtains first information of UE from a mobility management entity MME, wherein the first information carries a service gateway SGW address;

according to the SGW address, obtaining an interface address between the AMF and second network equipment from first network equipment, wherein the second network equipment comprises a session management function SMF and SGW which are combined;

according to the interface address between the AMF and the second network equipment, the AMF is connected with the SMF of the second network equipment;

wherein the obtaining, from the first network device, the interface address between the AMF and the second network device according to the SGW address includes:

in the case that the first network device comprises a domain name system DNS and a network storage function NRF, sending a domain name query request carrying an SGW address to the DNS; receiving an interface address between an AMF (advanced mobile unit) from an NRF and second network equipment, wherein the interface address between the AMF and the second network equipment is obtained by inquiring a domain name corresponding to an SGW (serving gateway) address sent by the NRF according to DNS (domain name server);

in the case that the first network device comprises a DNS and an NRF which are separately set, sending a domain name query request carrying an SGW address to the DNS; receiving a domain name corresponding to the SGW address returned by the DNS; sending an interface address query request carrying the domain name to an NRF; and receiving an interface address between the AMF returned by the NRF and the second network equipment.

2. The method of claim 1, wherein the domain name is a fully qualified domain name FQDN.

3. The method of claim 1, wherein the first information is a context of the UE, the AMF obtaining the first information of the UE from an MME, comprising:

the AMF sends a UE context acquisition request to the MME when receiving a position update request of the UE moving from the 4G network to the 5G network;

and receiving the context of the UE returned by the MME.

4. The method of claim 1, wherein the first information is a forward relocation request, the AMF obtaining the first information of the UE from an MME, comprising:

5. The method of any of claims 1-4, wherein the UE moving from a 4G network to a 5G network comprises: the UE moves to a 5G network in a 4G network roaming state; and/or

The first information also carries a tunnel endpoint identification TEID and a session management SM context.

6. The method of claim 1, the method further comprising: in case of application to a UE moving from a 5G network to a 4G network,

the AMF sends an acquisition request of protocol data unit PDU session information to the SMF of the second network equipment, wherein the second network equipment comprises SGW in addition to the SMF, and the SGW and the SMF are combined;

and sending second information carrying the SGW address to the MME.

7. The method of claim 6, wherein the second information is a context of the UE, the AMF sending an acquisition request of PDU session information to an SMF of a second network device, comprising:

when receiving a UE context acquisition request sent by an MME, the AMF sends an acquisition request of PDU session information to an SMF of second network equipment; wherein the UE context acquisition request is sent by the MME upon receipt of a location update request for the UE to move from the 5G network to the 4G network.

8. The method of claim 6, wherein the second information is a relocation request, the AMF sending an acquisition request for PDU session information to an SMF of a second network device, comprising:

9. The method of any of claims 6-8, wherein the UE moving from a 5G network to a 4G network comprises: the UE moves to a 4G network in a 5G network roaming state; and/or

The second information also carries TEID and SM context.

10. An apparatus for interoperating a 4G with a 5G network, the apparatus comprising a first interoperation module for application in a scenario where a UE moves from the 4G network to the 5G network, the first interoperation module comprising:

a connection unit, configured to connect with an SMF of a second network device according to an interface address between the AMF and the second network device;

wherein the second obtaining unit obtaining, from the first network device, the interface address between the AMF and the second network device according to the SGW address includes:

11. The apparatus of 4G and 5G network interoperability of claim 10, the apparatus further comprising: a second interoperation module applied in a case where a UE moves from a 5G network to a 4G network, the second interoperation module comprising:

and the sending unit is used for sending the second information carrying the SGW address to the MME.

12. A system for interoperating a 4G and 5G network, comprising an MME, an AMF, a first network device, and a second network device, wherein:

the AMF is used for obtaining first information carrying SGW addresses of the UE from the MME; obtaining an interface address between the AMF and the second network device from the first network device according to the SGW address; according to the interface address between the AMF and the second network equipment, connecting with the SMF; a kind of electronic device with high-pressure air-conditioning system

An acquisition request for transmitting PDU session information to the SMF; receiving PDU session information carrying SGW address returned by SMF; sending second information carrying the SGW address to the MME;

wherein the AMF obtaining the interface address between the AMF and the second network device from the first network device according to the SGW address comprises: in the case that the first network device includes a DNS and an NRF that are set together, the AMF is configured to send a domain name query request carrying an SGW address to the DNS; receiving an interface address between an AMF and second network equipment from the NRF, wherein the interface address between the AMF and the second network equipment is obtained by inquiring a DN (digital subscriber line) corresponding to an SGW (serving gateway) address sent by the NRF according to the DNS;

13. A 4G and 5G network interoperable device, comprising:

a memory; and

a processor coupled to the memory, the processor configured to perform the method of interoperating a 4G and 5G network of any of claims 1-9 based on instructions stored in the memory.

14. A computer readable storage medium having stored thereon a computer program which when executed by a processor implements a method of interoperating a 4G and 5G network as claimed in any of claims 1 to 9.