WO2020073856A1

WO2020073856A1 - Method and system for anchoring smf + pgw-c in 4g/5g interchanging scenario

Info

Publication number: WO2020073856A1
Application number: PCT/CN2019/109195
Authority: WO
Inventors: 丰孝英
Original assignee: 中兴通讯股份有限公司
Priority date: 2018-10-09
Filing date: 2019-09-29
Publication date: 2020-04-16
Also published as: CN111031581A; CN111031581B

Abstract

Disclosed are a method and system for anchoring an SMF + PGW-C in a 4G/5G interchanging scenario. The method is applicable in a converged server, comprising: receiving a 4G registration request transmitted by a user terminal via a mobile management entity (MME); feeding session information back to the MME on the basis of the 4G registration request so as to allow the MME to search, on the basis of PGW full domain name information in the session information fed back, for a converged network element (SMF + PGW-C) of a session management function and PDN gateway control plane on which a session is found, where the session information fed back comprises the PGW full domain name information of the converged network element.

Description

Method and system for anchoring SMF + PGW-C in 4 / 5G inter-switching scenario

cross reference

The present invention requires a Chinese patent application filed on October 09, 2018 in the Chinese Patent Office with the application number 201811173479.3 and the invention titled "A method and system for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario." Priority, the entire content of this application is incorporated by reference in the present invention.

Technical field

The invention relates to the technical field of mobile communications, and in particular to a method for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario.

Background technique

With the development of network technology, the scope of 5G network laying is getting wider and wider. However, 5G network does not cover all regions. Therefore, when users move from the area covered by 5G network to the area not covered by 5G network, Need to complete the switch from 5G network to 4G network.

In some cases, the switching scheme is to set up the N26 interface. When the user equipment needs to switch from the 5G network to the 4G network, the AMF (Access and Mobility Management Function, access and mobility management function) and target of the original network directly through the N26 interface. The MME (Mobility Management Entity) of the network transfers the mobility management state and the session management state. Therefore, when the N26 interface is provided, the MME can determine the need based on the mobility management state and the session management state obtained from the AMF Access the PDN gateway, and then complete the switch from 5G to 4G.

However, when the N26 interface is not set, there is no communication link between the AMF of the 5G network and the MME of the 4G network, and the MME cannot obtain the mobility management state and session association state from the AMF. Based on the network element that supports both 5G communication and 4G communication is a fusion network element including SMF (Session Management Function) + PGW-C (PDN Gateway Control plane function, PDN gateway control plane), therefore, there is no N26 interface At the time, anchoring the fusion network element SMF + PGW-C in the scenario of 5G to 4G switching became a major problem.

In summary, in some cases, there is a lack of a method and system for anchoring SMF + PGW-C in the 4 / 5G inter-switching scenario.

Summary of the invention

The purpose of the embodiments of the present invention is to provide a method and system for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario to solve the lack of an anchoring SMF + in a 4 / 5G inter-switching scenario in some situations PGW-C method and system technical issues.

To solve the above technical problems, the embodiments of the present invention are implemented as follows:

In a first aspect, an embodiment of the present invention provides a method for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario, which is applied to a fusion server. The method includes: receiving 4G sent by a user equipment through a mobile management entity MME Registration request; according to the 4G registration request, feed back session information to the mobile management entity MME for the mobile management entity MME to query the session management function and PDN gateway where the session is based on the PGW complete domain name information in the fed back session information The fusion network element SMF + PGW-C of the control plane; wherein, the fed back session information includes the PGW complete domain name information of the fusion network element.

In a second aspect, an embodiment of the present invention provides a method for anchoring SMF + PGW-C in a 4 / 5G inter-handover scenario, which is applied to a mobile management entity MME in 4G communication. The method includes: receiving a message sent by a user equipment 4G registration session request, and send the PDU connection establishment request to the corresponding converged network element SMF + PGW-C; the 4G registration session request includes the PDU connection establishment request; receiving the feedback from the fusion server includes the converged network element SMF + Session information of the complete domain name information of PGW-C; query the GTP address of the S5-C of the converged network element PGW + SMF-C where the session information is located according to the PGW complete domain name information in the session information; according to the GTP address Determine the PDN gateway PGW after switching to the 4G scenario; send a session creation request, requesting its gateway to switch from the SMF to the PDN gateway PGW; wherein, the PDN gateway PGW is the PDN gateway corresponding to the user equipment in the 4G scenario, SMF is a network element of the session management function corresponding to the user equipment in a 5G scenario.

In a third aspect, a system for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario, which is applied to a convergence server, is characterized by comprising: a first receiving module, configured to receive user equipment sent by a mobile management entity MME 4G registration request; a feedback module, which is used to feed back the session information to the mobile management entity MME according to the 4G registration request, so that the mobile management entity MME can query the session location based on the PGW complete domain name information in the fed back session information And the fusion network element SMF + PGW-C of the PDN gateway control plane; wherein, the fed back session information includes the complete PGW domain name information of the fusion network element.

According to a fourth aspect, a system for anchoring SMF + PGW-C in a 4 / 5G inter-handover scenario, which is applied to a mobile management entity MME in 4G communication, is characterized by comprising: a second receiving module for receiving user equipment Send a 4G registration session request, and send the PDU connection establishment request to the corresponding converged network element SMF + PGW-C; the 4G registration session request includes a PDU connection establishment request; the second receiving module also uses To receive the session information including the complete domain name information of the fusion network element SMF + PGW-C fed back by the fusion server; the addressing module is used to query the fusion network element where the session information is located according to the PGW complete domain name information in the session information PGW + SMF-C S5-C GTP address; service PGW determination module, used to determine the service PGW after switching to 4G scenario based on the GTP address; request module, used to send a session creation request, requesting its gateway to be managed by SMF Switch to the service PGW; wherein, the PDN gateway PGW is the PDN gateway corresponding to the user equipment in the 4G scenario, and the SMF is the system management device corresponding to the user equipment in the 5G scenario.

According to a fifth aspect, an embodiment of the present invention provides a network device, including a memory, a processor, and a computer application program that can run on the memory, and the computer application program is executed by the processor Realize any method of anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario applied to the fusion server.

According to a sixth aspect, an embodiment of the present invention provides a computer-readable storage medium that stores a computer program on the computer-readable storage medium, and when the computer program is executed by a processor, any one of the items applied to the fusion server is implemented. Method for anchoring SMF + PGW-C in 4 / 5G inter-switching scenarios.

According to a seventh aspect, an embodiment of the present invention provides a network device, including a memory, a processor, and a computer program that can run on the memory, and the computer program is implemented when executed by the processor Any one of the methods for anchoring SMF + PGW-C in a 4 / 5G inter-handover scenario applied to the mobile management entity MME in 4G communication.

According to an eighth aspect, an embodiment of the present invention provides a computer-readable storage medium that stores a computer program on the computer-readable storage medium, and when the computer program is executed by a processor, any one of the items applied in the 4G communication letter A method for anchoring SMF + PGW-C in the 4 / 5G inter-switching scenario of the mobile management entity MME.

BRIEF DESCRIPTION

The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation on the present invention. In the drawings:

1 is a flowchart of a method for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario in an embodiment of the present invention;

2 is a flowchart of another method for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario according to an embodiment of the present invention;

3 is a flowchart of another method for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario in an embodiment of the present invention;

4 is a block diagram of a system for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario according to an embodiment of the present invention;

5 is a block diagram of another system for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario according to an embodiment of the present invention;

6 is a block diagram of a network device according to an embodiment of the present invention;

7 is a block diagram of yet another network device in an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present invention.

An embodiment of the present invention provides a method for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario, which is applied to a fusion server that has an HSS (Home Subscriber Server, HSS server) function and UDM (Unified Data Repository, unified data storage) function, as shown in Figure 1, the method includes:

Step S102: Receive a 4G registration request sent by the user equipment through the mobile management entity MME;

In the embodiment of the present invention, the 4G registration request is issued when the user equipment needs to switch to 4G communication, and originates from the user equipment and is sent via the mobile management entity MME. The 4G registration request may be an Attach request. The Attach request may carry a PDU Connection establishment request. The type field of the Attach request is Handover.

It is pointed out here that the user equipment can send the 4G registration request according to its needs. For example, although the user equipment is in the area covered by the 5G signal, the user equipment cannot use 5G communication for some reasons, such as the failure of the 5G communication module of the user equipment Etc., then the user equipment can send a 4G registration request through the MME; or due to geographic location reasons, when the user equipment moves from the area covered by the 5G signal to the area not covered by the 5G signal, the user equipment sends the mobile management entity MME 4G registration request.

Further, in order to maintain a good user experience, a detection module may be provided in the user equipment, the detection module may detect the strength of the 5G signal, and when the strength of the 5G signal is detected to be lower than the preset strength value, the user equipment is triggered The 4G handover request is sent through the mobile management entity MME. This solution can avoid the problem of bad user experience caused by the user equipment manually sending a 4G registration request every time when switching to 4G communication.

Further, in order to avoid erroneous switching, or even if the current 5G signal is weak, but there is still no need to switch to 4G, the user equipment sets a prompt module for popping up a switching prompt message, after receiving the switching confirmation instruction input by the user To switch again. If the switch instruction is not received within the preset time period, the switch prompt message can be sent again after a preset time interval.

Step S104: According to the 4G registration request, feed back session information to the mobile management entity MME for the mobile management entity MME to query the session management function SMF and PDN where the session is based on the PGW complete domain name information in the fed back session information The fusion network element SMF + PGW-C of the gateway control plane PGW; wherein, the fed back session information includes the PGW complete domain name information of the fusion network element.

In the embodiment of the present invention, after the converged network element SMF + PGW-C receives the 4G registration request sent by the mobile management entity MME, according to the 4G registration request, the mobile management entity MME is fed back including the converged network element The session information of the complete PGW domain name of SMF + PGW-C. Therefore, after receiving the session information, the MME can find the converged network element SMF + PGW-C according to the complete PGW domain name information of the converged network element.

In the embodiment of the present invention, the converged network element SMF + PGW-C has the SMF function in 5G communication and the PGW function in 4G communication. Therefore, in the 4 / 5G switching scenario, in order to maintain the continuity of the session, the user The device needs to access the converged network element SMF + PGW-C which has both the SMF function in 5G communication and the PGW function in 4G communication.

In the embodiment of the present invention, in order to maintain the continuity of the session of the user equipment, the converged network element that the mobile device accesses in the 5G scenario and the converged network element that is accessed after switching to 4G are the same converged network element, only However, in the 5G scenario, the SMF function of the converged network element is used, and after switching to the 4G scenario, the PGW function of the converged network element is used.

As follows, a specific embodiment will be listed for explanation.

For example, the user registers the SMF function of the converged network element with the number N in a 5G scenario, where the complete PGW domain name of the converged network element with the number N is Name1; the converged server receives the 4G sent by the user equipment through the mobile management entity MME After the registration request, the mobile management entity MME is fed back the session information including the PGW full domain name Name1.

After receiving the session information including the PGW full domain name Name1, the mobile management entity MME can find the converged network element with the number N according to the PGW full domain name Name1.

After the mobile management entity MME finds the converged network element with the number N, it can provide it to the user equipment, and the user equipment can register the PGW function of the converged network element with the number N.

The method for anchoring SMF + PGW-C in the 4 / 5G inter-switching scenario provided by the embodiment of the present invention, when the N26 interface is not set, when the user equipment switches to the 4G scenario, the session information fed back by the fusion server includes the fusion network element ’s PGW full domain name, for the mobile management entity MME to find the converged network element registered in the 5G scenario according to the PGW full domain name, which can effectively ensure that the user equipment registers a converged network with the same network address before and after switching, which effectively guarantees the switching The continuity of the conversation before and after the 4G scenario.

Referring to FIG. 2, in the embodiment of the present invention, before step S102, the method may further include the following steps.

Step S101: Receive 5G session registration request information sent by the user equipment through the converged network element SMF + PGW-C, register and store the 5G session registration request information; in the embodiment of the present invention, through step S101, the user The device may register a 5G session on the fusion server, and store the 5G session registration request information on the fusion server. Further, the 5G session registration request information includes the complete PGW domain name information of the converged network element SMF + PGW-C. The 5G session registration request information is sent by the user equipment to the converged network element SMF + PGW-C through the access and mobility management function AMF And, there is no communication link between the access and mobility management function AMF and the mobility management entity MME.

It is pointed out here that in the 5G scenario, the user equipment sends 5G session registration request information to the converged network element SMF + PGW-C through the access and mobility management function AMF. After the converged network element receives the 5G session registration request information, it The session registration request information is registered to the fusion server HSS + UDM, and the 5G session registration request information is stored to the fusion server HSS + UDM. Among them, the fusion server is formed by the fusion of the server with HSS function and the server with UDM function, the server with HSS function is the server used in 5G communication, and the server with UDM function is the server used in 4G communication Therefore, the fusion server formed by the fusion of the server with the HSS function and the server with the UDM function can be used for both 5G communication and 4G communication.

In the embodiment of the present invention, there is no communication link between the access and mobility management function AMF and the mobility management entity MME. As is well known, in a 5G scenario, the user equipment selects the converged network element SMF + through the access and management function AMF PGW-C, the fusion network element SMF + PGW-C calls the Nsmf_PDUSession_CreateSMContextRequest interface of SMF (Session Management Function) to establish a session for the user equipment; and in the 4G communication scenario, the user equipment sends 4G registration through the mobile management entity MME Request, if there is a communication link between the access and mobility management function AMF and the mobility management entity MME, the mobility management entity MME can communicate with the access and mobility management function AMF to find the converged network element SMF + registered in the 5G scenario PGW-C, and then register to the PGW function of the converged network element SMF + PGW-C in this 5G scenario; when there is no communication link between the access and mobility management function AMF and the mobility management entity MME, switch to 4G In a scenario, the mobility management entity MME cannot obtain the address of the converged network element SMF + PGW-C from the access and mobility management function AMF, and the embodiments described in the present invention may be suitable An interface to a non-N26 (non-communications links between access and management functions and AMF mobility management entity MME) handover scenario, therefore, the present technical solution can effectively ensure the absence of N26 interfaces, communication continuity before and after switching to 4G scene.

In the embodiment of the present invention, the above step S101 further includes: 1) receiving 5G session registration request information sent by the user equipment through the converged network element SMF + PGW-C; in the embodiment of the present invention, it has an HSS function and UDM The function fusion server receives the 5G session registration request information sent by the user equipment through the fusion network element SMF + PGW-C to determine whether to allow registration of the 5G session registration request information according to the 5G session registration request information. Further, the 5G session registration request information SUPI, DNN, PDU Session ID, PGW complete domain name information, the PGW complete domain name information can be used to find the converged network element SMF + PGW-C, specifically, through PGW complete domain name information Query the GTP address of the complete domain name information of the PGW, and then find the converged network element SMF + PGW-C. 2) Detect whether the identifier of the 5G session registration request information is registered; 3) If the identifier of the 5G session registration request information is not registered, register the 5G session registration request information and store the 5G session registration request information.

In the embodiment of the present invention, after receiving the 5G session registration request information, the fusion server further determines whether the identifier of the 5G session registration request information is registered. If the identifier of the 5G session registration request information is not registered, then Register the 5G session registration request information on the fusion server, and store the 5G session registration request information to the fusion server; and if the identifier of the 5G session registration request information is registered, it only needs to be activated again.

In the method of anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario provided by an embodiment of the present invention, after receiving the 5G session registration request information, the fusion server determines whether the identifier of the 5G session registration request information has been registered, if not registered Then, register the 5G session registration request information and save the 5G session registration request information to the fusion server, based on the 5G session registration request information including PGW complete domain name information; when the fusion server receives the user equipment through the mobile management entity After the 4G registration request sent by the MME, after feeding back the session information including the complete domain name information of the PGW to the mobile management entity, the mobile management entity MME can query the converged network element according to the complete domain name information of the PGW, thereby completing the converged network element SMF + PGW-C is anchored for user equipment to complete 4G registration, which effectively solves the technical problem that the mobile management entity MME cannot query the fusion network element SMF + PGW-C registered in the 5G scenario without the N26 interface.

An embodiment of the present invention also provides a method for anchoring SMF + PGW-C in a 4 / 5G inter-handover scenario, which is applied to a mobile management entity MME in 4G communication. Referring to FIG. 3, the method includes the following steps.

Step S301: Receive a 4G registration session request sent by the user equipment, and send a PDU connection establishment request to the corresponding converged network element SMF + PGW-C; the 4G registration session request includes a PDU connection establishment request; in this embodiment of the present invention In the above, the 4G registration session request may be an Attach request, the Attach request carries a PDU Connection establishment request, and the request type of the Attach request is Handover.

In the embodiment of the present invention, after receiving the 4G registration session request, the mobile management entity MME may process the 4G registration session request of type Attach, for example, judging that the user equipment is switched from the 5G scene to the 4G scene, and the In the scenario without the N26 interface.

In the embodiment of the present invention, after receiving the 4G registration session request, the mobile management entity MME may send a location update request (such as an Update Location Request message) to the fusion server. The location update request is sent based on the user equipment moving to the location. As a result, it needs to be switched from a 5G scene to a 4G scene, that is, it needs to be switched from 5G to 4G because it moves from the original position to the current position.

Step S303: Receive the session information fed back by the fusion server; in the embodiment of the present invention, after the mobile management entity MME sends a location update request to the fusion server, it may receive a location update response message (Update Location Response) fed back by the fusion server HSS + UDM Among them, the location update response message fed back by the fusion server HSS + UDM includes DNN / APN and PGW complete domain name information of each PDU session established in the 5G scenario.

Step S305: Query the GTP address of the S5-C of the converged network element PGW + SMF-C where the session information is located according to the PGW complete domain name information in the session information; in the embodiment of the present invention, the mobile management entity MME according to the fusion The GTP address of the S5-C of the network element PGW + SMF-C is queried to the DNS server, and then the converged network element PGW + SMF-C can be queried.

Step S307: Determine the PDN gateway PGW after switching to the 4G scenario according to the GTP address; in the embodiment of the present invention, the mobile management entity MME selects the converged network element SMF + PGW-C queried in step 505 as the switched to the 4G scenario PGW (PDN Gateway) in the network, so as to ensure that the user equipment is served by the same SMF + PGW-C before and after switching to 4G, providing the necessary conditions for session continuity;

Step S309: Send a session creation request, requesting that its gateway be switched from SMF to the PDN gateway PGW; wherein, the PDN gateway PGW is the PDN gateway corresponding to the user equipment in the 4G scenario, and the SMF is the user in the 5G scenario The network element of the session management function corresponding to the device.

In the embodiment of the present invention, a specific method for creating a session request sent by the mobile management entity MME may be: the mobile management entity MME constructs a Create Session Request message, carries a Handover identifier, and requests SMF / PGW to switch sessions; then, according to the definition of 3GPP Complete the Attach request of the user equipment on the 4G network and the handover of the session from the 5G network to the 4G network.

In the embodiment of the present invention, S305 specifically includes: 1) querying the domain name system DNS using the complete PGW domain name information to obtain the GTP address of S5-C of the converged network element PGW-C + SMF; 2) according to The determining of the PTN gateway PGW after switching to the 4G scenario by the GTP address includes: using the converged network element whose address is the GTP address as the PDN gateway PGW after switching to the 4G scenario.

In the method of anchoring SMF + PGW-C in the 4 / 5G inter-switching scenario provided by the embodiment of the present invention, after receiving the 4G registration session request sent by the user equipment, the mobile management entity MME sends the PDU connection establishment request to the corresponding converged network element SMF + PGW-C, and receive the session information including the complete PDN domain name information of the converged network element SMF + PGW-C fed back by the fusion server, and then the converged network element SMF + PGW- can be queried based on the complete PDN domain name information C. After that, a session creation request can be sent to request its gateway to switch from the SMF of the converged network element SMF + PGW-C to the PGW of the converged network element to complete the 4G registration, effectively avoiding the inability to query 5G without the N26 interface Technical problems of the converged network elements registered in the scenario.

Corresponding to a method for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario applied to a fusion server provided by an embodiment of the present invention, an embodiment of the present invention provides a 4 / 5G inter-switch scenario applied to a fusion server An anchored SMF + PGW-C system. The fusion server has HSS and UDM functions. As shown in FIG. 4, the system includes: a first receiving module 411, configured to receive user equipment through the mobile management entity MME 4G registration request; the feedback module 412 is used to feed back the session information to the mobile management entity MME according to the 4G registration request for the mobile management entity MME to query the session based on the PGW complete domain name information in the fed back session information Converged network element SMF + PGW-C of the session management function and the control plane of the PDN gateway; where the fed back session information includes PGW FQDN complete domain name information of the converged network element.

In an embodiment, the first receiving module 411 is further configured to: receive 5G session registration request information sent by the user equipment through the converged network element SMF + PGW-C; the system further includes: a registration module Is used to register the 5G session registration request information; the storage module is used to store the 5G session registration request information; wherein, the 5G session registration request information includes the PGW full domain name of the converged network element SMF + PGW-C Information, the 5G session registration request information is sent by the access and mobility management function AMF to the converged network element SMF + PGW-C, and there is no communication link between the access and mobility management function AMF and the mobility management entity MME.

In one embodiment, the system further includes: a detection module for detecting whether the fusion server is registered with the identifier of the 5G session registration request information; the registration module is specifically used for: if the registration is not registered The identifier of the 5G session registration request information is to register the 5G session registration request information; the storage module is specifically configured to: if the identifier of the 5G session registration request information is not registered, store the 5G session registration request information .

In the system for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario provided by an embodiment of the present invention, after the first receiving module receives the 4G registration request sent by the user equipment through the mobile management entity MME, the feedback module is based on the 4G Registration request, feedback the session information including the complete PGW domain name information to the mobile management entity MME, so that the mobile management entity MME can query the converged network element SMF + PGW-C registered in the 5G scenario according to the PGW complete domain name information for the user equipment to complete The service PGW registered by 4G to the converged network element SMF + PGW-C effectively solves the technical problem that the mobile management entity MME cannot query the converged network element SMF + PGW-C registered in the 5G scenario without the N26 interface.

Corresponding to a method for anchoring SMF + PGW-C in a 4 / 5G inter-handover scenario applied to a mobile management entity MME provided in an embodiment of the present invention, which is applied in 4G communication, an embodiment of the present invention provides a 4 / 5G The system for anchoring SMF + PGW-C in the scenario of mutual handover, as shown in FIG. 5, includes: a second receiving module 511, configured to receive a 4G registration session request sent by the user equipment, and send the PDU connection establishment request to The corresponding converged network element SMF + PGW-C; the 4G registration session request includes a PDU connection establishment request; the second receiving module 511 is also used to receive session information fed back by the converged network element SMF + PGW-C; The address module 512 is used to query the GTP address of the S5-C of the converged network element PGW + SMF-C where the session information is located according to the complete PGW domain name information in the session information; the service PGW determination module 513 is used to The GTP address determines the service PGW after switching to the 4G scenario; the request module 514 is used to send a session creation request to request its gateway to switch from the SMF to the service PGW; wherein, the PDN gateway PGW is the user in the 4G scenario The PDN gateway corresponding to the device, SMF is 5G field The user of the device corresponding to the system management device.

In one embodiment, the addressing module 512 is specifically configured to: query the domain name system DNS using the complete PGW domain name information to obtain the GTP address of the S5-C of the converged network element PGW-C + SMF; The PDN gateway PGW determination module is specifically used to adopt the converged network element whose address is the GTP address as the PDN gateway PGW after switching to the 4G scenario.

An embodiment of the present invention provides a system for anchoring SMF + PGW-C in a 4 / 5G handover scenario. After receiving the 4G registration session request sent by the user equipment, the second receiving module sends the PDU connection establishment request to the corresponding converged network Meta SMF + PGW-C, and receive the session information including the PDN complete domain name information of the converged network element SMF + PGW-C fed back by the fusion server, and then the converged network element SMF + PGW can be queried according to the PDN complete domain name information -C. After that, a session creation request can be sent to request its gateway to switch from the SMF of the converged network element SMF + PGW-C to the PGW of the converged network element to complete the 4G registration, effectively avoiding the inability to query 5G without the N26 interface Technical problems of the converged network elements registered in the scenario.

Corresponding to the method and system for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario applied to a fusion server provided by an embodiment of the present invention, an embodiment of the present invention provides a network device, as shown in FIG. 6, The network device includes a processor 610, a transceiver 620, a memory 630, and a bus interface. Wherein: In the embodiment of the present invention, the network device 600 further includes: a computer program stored on the memory 630 and executable on the processor 610, which is implemented by the processor 610 when the computer program is executed. Or each process in the method shown in FIG. 2 and can achieve the same technical effect, so as to avoid repetition, it will not be repeated here.

In FIG. 6, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 610 and various circuits of the memory represented by the memory 630 are linked together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art, and therefore, they will not be further described in this article. The bus interface provides an interface. The transceiver 620 may be a plurality of elements, including a transmitter and a receiver, and provides a unit for communicating with various other devices on a transmission medium.

The processor 610 is responsible for managing the bus architecture and general processing, and the memory 630 may store data used by the processor 610 in performing operations.

Embodiments of the present invention also provide a computer-readable storage medium, which stores a computer program on the computer-readable storage medium. When the computer program is executed by a processor, the processes of the foregoing method embodiments are implemented, and the same technical effect can be achieved. To avoid repetition, I will not repeat them here. Wherein, the computer-readable storage medium, such as read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

Corresponding to a method and system for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario applied to a mobile management entity MME in 4G communication provided by an embodiment of the present invention, an embodiment of the present invention provides a network device, As shown in FIG. 7, the network device includes a processor 710, a transceiver 720, a memory 730, and a bus interface. Wherein: In the embodiment of the present invention, the network device 700 further includes: a computer program stored on the memory 730 and executable on the processor 710, which is implemented by the processor 710 when the computer program is executed. The various processes in the method shown can achieve the same technical effect. To avoid repetition, they are not described here.

In FIG. 7, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 710 and various circuits of the memory represented by the memory 730 are linked together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art, and therefore, they will not be further described in this article. The bus interface provides an interface. The transceiver 720 may be a plurality of elements, including a transmitter and a receiver, and provides a unit for communicating with various other devices on a transmission medium.

The processor 710 is responsible for managing the bus architecture and general processing, and the memory 730 may store data used by the processor 710 in performing operations.

An embodiment of the present invention also provides a computer-readable storage medium that stores a computer program on the computer-readable storage medium. When the computer program is executed by a processor, the processes of FIG. 1 or FIG. 2 in the foregoing method embodiments are implemented, and The same technical effect can be achieved, and in order to avoid repetition, it will not be repeated here. Wherein, the computer-readable storage medium, such as read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

It should be noted that in this article, the terms "include", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements It also includes other elements that are not explicitly listed, or include elements inherent to this process, method, article, or device. Without more restrictions, the element defined by the sentence "include one ..." does not exclude that there are other identical elements in the process, method, article or device that includes the element.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods in the above embodiments can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware, but in many cases the former is better Implementation. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence or part that contributes to the existing technology, and the computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, The CD-ROM includes several instructions to enable a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the method described in each embodiment of the present invention.

The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only schematic, not restrictive. Those of ordinary skill in the art Under the enlightenment of the present invention, many forms can be made without departing from the spirit of the present invention and the scope of protection of the claims, all of which fall within the protection of the present invention.

Claims

A method for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario, applied to a fusion server, which includes:

Receive the 4G registration request sent by the user equipment through the mobile management entity MME;

According to the 4G registration request, the session information is fed back to the mobile management entity MME for the mobile management entity MME to query the session management function where the session is located and the PDN gateway control plane according to the PGW complete domain name information in the fed back session information Converged network element SMF + PGW-C;

Wherein, the feedback session information includes the complete PGW domain name information of the converged network element.
The method according to claim 1, wherein before the receiving the 4G registration request sent by the user equipment through the MME, the method further comprises:

Receive 5G session registration request information sent by the user equipment through the converged network element SMF + PGW-C, register and store the 5G session registration request information;

Wherein, the 5G session registration request information includes the complete PGW domain name information of the converged network element SMF + PGW-C, and the 5G session registration request information is sent by the access and mobility management function AMF to the converged network element SMF + PGW- C. There is no communication link between the access and mobility management function AMF and the mobility management entity MME.
The method according to claim 2, wherein the receiving 5G session registration request information sent by the user equipment through the converged network element SMF + PGW-C, registering and storing the 5G session registration request information includes:

Receiving 5G session registration request information sent by the user equipment through the converged network element SMF + PGW-C;

Detect whether the identifier of the 5G session registration request information is registered;

If the identifier of the 5G session registration request information is not registered, the 5G session registration request information is registered, and the 5G session registration request information is stored.
A method for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario, applied to the mobile management entity MME in 4G communication, which includes:

Receiving a 4G registration session request sent by the user equipment, and sending a PDU connection establishment request to the corresponding converged network element SMF + PGW-C; the 4G registration session request includes a PDU connection establishment request;

Receiving session information including the complete domain name information of the fusion network element SMF + PGW-C fed back by the fusion server;

Query the GTP address of the S5-C of the converged network element PGW + SMF-C where the session information is located according to the complete PGW domain name information in the session information;

Determine the PDN gateway PGW after switching to the 4G scenario according to the GTP address;

Send a session creation request, requesting that its gateway be switched from SMF to the PDN gateway PGW;

Wherein, the PDN gateway PGW is the PDN gateway corresponding to the user equipment in the 4G scenario, and the SMF is the network element of the session management function corresponding to the user equipment in the 5G scenario.
The method according to claim 4, wherein the querying the GTP address of the S5-C of the converged network element PGW + SMF-C where the session information is located according to the complete PGW domain name information in the session information includes:

Use the PGW complete domain name information to query the DNS of the domain name system to obtain the GTP address of the S5-C of the converged network element PGW-C + SMF;

The determining the PDN gateway PGW after switching to the 4G scenario according to the GTP address includes:

The converged network element whose address is the GTP address is used as the PDN gateway PGW after switching to the 4G scenario.
A system for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario, applied to a fusion server, which includes:

The first receiving module is used to receive the 4G registration request sent by the user equipment through the mobile management entity MME;

The feedback module is used to feed back the session information to the mobile management entity MME according to the 4G registration request, so that the mobile management entity MME can query the session management function where the session is based on the PGW complete domain name information in the fed back session information Converged network element SMF + PGW-C of PDN gateway control plane;

Wherein, the feedback session information includes the complete PGW domain name information of the converged network element.
The system according to claim 6, wherein the first receiving module is further used to:

Receiving 5G session registration request information sent by the user equipment through the converged network element SMF + PGW-C;

The system also includes:

A registration module for registering the 5G session registration request information;

A storage module, used to store the 5G session registration request information;

Wherein, the 5G session registration request information includes the complete PGW domain name information of the converged network element SMF + PGW-C, and the 5G session registration request information is sent by the access and mobility management function AMF to the converged network element SMF + PGW- C. There is no communication link between the access and mobility management function AMF and the mobility management entity MME.
The system of claim 7, further comprising:

A detection module, configured to detect whether the fusion server has registered the identifier of the 5G session registration request information;

The registration module is used to:

If the identifier of the 5G session registration request information is not registered, register the 5G session registration request information;

The storage module is used for:

If the identifier of the 5G session registration request information is not registered, the 5G session registration request information is stored.
A system for anchoring SMF + PGW-C in a 4 / 5G inter-switching scenario, which is applied to the mobile management entity MME in 4G communication, which includes:

The second receiving module is used to receive the 4G registration session request sent by the user equipment and send the PDU connection establishment request to the corresponding converged network element SMF + PGW-C; the 4G registration session request includes the PDU connection establishment request ;

The second receiving module is also used to receive the session information including the complete domain name information of the fusion network element SMF + PGW-C fed back by the fusion server;

The addressing module is used to query the GTP address of S5-C of the converged network element PGW + SMF-C where the session information is located according to the complete PGW domain name information in the session information;

The service PGW determination module is used to determine the service PGW after switching to the 4G scenario according to the GTP address;

The request module is used to send a session creation request, requesting that its gateway be switched from SMF to the service PGW;

The PDN gateway PGW is a PDN gateway corresponding to the user equipment in a 4G scenario, and the SMF is a system management device corresponding to the user equipment in a 5G scenario.
The system according to claim 9, wherein the addressing module is configured to:

Use the PGW complete domain name information to query the DNS of the domain name system to obtain the GTP address of the S5-C of the converged network element PGW-C + SMF;

The PDN gateway PGW determination module is used to:

The converged network element whose address is the GTP address is used as the PDN gateway PGW after switching to the 4G scenario.
A network device, including a memory, a processor, and a computer program that can run on the memory and the processor, and when the computer program is executed by the processor, any one of claims 1-3 is realized The method of anchoring SMF + PGW-C in the 4 / 5G inter-switching scenario described in the item.
A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the 4 / 5G mutual exchange according to any one of claims 1 to 3 is realized Method of anchoring SMF + PGW-C in the switching scenario.
A network device, which includes a memory, a processor, and a computer program that can run on the memory and the processor, and when the computer program is executed by the processor, implement any of the power requirements 4-5 A method for anchoring SMF + PGW-C in the scenario of 4 / 5G inter-switching.
A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the 4 / 5G mutual exchange according to any one of claims 4 to 5 is realized Method of anchoring SMF + PGW-C in the switching scenario.