WO2021136360A1 - Method and device for processing service area handover - Google Patents

Abstract

Embodiments of the present disclosure provide a method and device for processing a service area handover. The method comprises: receiving a handover request; and acquiring a session management context of a PDU session corresponding to a first DNN of a terminal, and sending, to a MME, a relocation request including the session management context of the PDU session corresponding to the first DNN, wherein DNNs currently accessed by the terminal comprise the first DNN, and a service area of the first DNN includes a handover target area.

Description

Service area switching processing method and equipment

Cross-references to related applications

This application claims the priority of Chinese Patent Application No. 202010005094.7 filed in China on January 3, 2020, the entire content of which is incorporated herein by reference.

Technical field

The embodiments of the present disclosure relate to the field of communication technology, and in particular to a method and device for processing service area switching.

Background technique

Industrial network application is a major application scenario of the fifth generation of mobile communication technology (5th generation, 5G). For park-type industrial networks, "service regionality" is one of the important characteristics, that is, users can only be in a limited area Use a specific business. In real scenarios, "service regionality" will become complicated, that is, for the services on the same terminal, some can only be used in a limited area, and some can be used outside the area.

Referring to Figure 1, users have simultaneous voice services and data services in the park. When users move outside the park, they can continue to use voice services according to business policies, but data services cannot be used due to the requirements of enterprise data security.

Currently, the Data Network Name (DNN) and its corresponding service area (List of Tracking Area (TA) allowed to use) are configured on the Access and Mobility Management Function (AMF) If the service area of the DNN currently accessed by the terminal does not include the handover target area, when the terminal enters the handover target area, the terminal PDU session may be interrupted.

Summary of the invention

An objective of the embodiments of the present disclosure is to provide a service area switching processing method and device to solve the problem of how to ensure the continuity of a terminal PDU session.

In the first aspect, embodiments of the present disclosure provide a service area switching processing method, which is applied to AMF, including:

Receive handover request;

Acquire the session management context of the PDU session corresponding to the first DNN of the terminal, and send a relocation request to the mobility management entity MME, where the relocation request includes: the session management context of the PDU session corresponding to the first DNN;

Wherein, the DNN currently accessed by the terminal includes: the first DNN, and the service area of the first DNN includes a handover target area.

Optionally, the method further includes:

Sending a session management context acquisition request to the SMF, where the session management context acquisition request includes: an identifier of the session management context of the PDU session corresponding to the first DNN;

Receiving the session management context of the PDU session corresponding to the first DNN sent by the SMF;

Wherein, the DNN currently accessed by the terminal further includes: a second DNN, and the service area of the second DNN does not include the handover target area.

Optionally, the method further includes:

A PDU session management context release request is sent to the SMF, where the PDU session management context release request includes: an identifier of the session management context of the PDU session corresponding to the second DNN.

Optionally, the session management context acquisition request further includes: indication information indicating whether the service area corresponding to the DNN related to the session management context includes the handover target area.

Optionally, the method further includes:

Receiving a failure message sent by the SMF according to the indication information;

Wherein, the failure message indicates that obtaining the session management context of the PDU session corresponding to the second DNN fails.

Optionally, before the sending the session management context acquisition request of the PDU session to the SMF, the method further includes:

It is determined whether the service area corresponding to the DNN currently accessed by the terminal includes the handover target area.

Optionally, the determining whether the service area corresponding to the DNN currently accessed by the terminal includes the handover target area includes:

Determining, according to the active DNN list, the identifier of the handover target area, and service area information, whether the service area corresponding to the DNN currently accessed by the terminal includes the handover target area;

Wherein, the service area information indicates the corresponding relationship between the DNN and the service area identifier.

In the second aspect, the embodiments of the present disclosure also provide a service area switching processing method, which is applied to SMF, including:

Sending the session management context of the PDU session corresponding to the first DNN of the terminal to the AMF;

The DNN currently accessed by the terminal includes: the first DNN, and the service area of the first DNN includes a handover target area.

Optionally, the sending the session management context of the PDU session corresponding to the first DNN to the AMF includes:

Receiving a session management context acquisition request from the AMF, where the session management context acquisition request includes: an identifier of the session management context of the PDU session corresponding to the first DNN;

Sending the session management context of the PDU session corresponding to the first DNN to the AMF according to the session management context acquisition request;

Wherein, the DNN currently accessed by the terminal further includes: a second DNN, and the service area of the second DNN does not include the handover target area.

Optionally, the method further includes:

Receiving a PDU session management context release request sent by the AMF, where the PDU session management context release request includes: an identifier of the session management context of the PDU session corresponding to the second DNN;

Release the PDU session corresponding to the second DNN, or keep the PDU session corresponding to the second DNN.

Optionally, the session management context acquisition request further includes: indication information indicating whether the service area corresponding to the DNN related to the session management context includes the handover target area.

Optionally, the method further includes:

According to a pre-configured policy, the PDU session corresponding to the second DNN is maintained; or, the PDU session release procedure corresponding to the second DNN is initiated.

Optionally, the pre-configured policy is configured locally by the SMF; or, it is obtained from the policy control function PCF.

Optionally, the method further includes:

Sending a failure message to the AMF;

Wherein, the failure message indicates that obtaining the session management context of the PDU session corresponding to the second DNN fails.

In the third aspect, the embodiments of the present disclosure also provide an AMF, including:

The first receiving module is configured to receive a handover request;

The first sending module is configured to obtain the session management context of the PDU session corresponding to the first DNN of the terminal, and send a relocation request to the MME, where the relocation request includes: the session management context of the PDU session corresponding to the first DNN;

The DNN currently accessed by the terminal includes the first DNN, and the service area of the first DNN includes the handover target area.

In a fourth aspect, an embodiment of the present disclosure also provides an AMF, including: a first transceiver and a first processor;

The first transceiver is used to receive a handover request;

The first transceiver is also used to obtain the session management context of the PDU session corresponding to the first DNN of the terminal, and send a relocation request to the MME, where the relocation request includes: the session of the PDU session corresponding to the first DNN Management context

The DNN currently accessed by the terminal includes the first DNN, and the service area of the first DNN includes the handover target area.

In a fifth aspect, the embodiments of the present disclosure also provide an SMF, including:

The second sending module is configured to send the session management context of the PDU session corresponding to the first DNN of the terminal to the AMF;

The DNN currently accessed by the terminal includes: the first DNN, and the service area of the first DNN includes a handover target area.

In a sixth aspect, the embodiments of the present disclosure also provide an SMF, including: a second transceiver and a second processor;

The second transceiver is configured to send the session management context of the PDU session corresponding to the first DNN of the terminal to the AMF;

The DNN currently accessed by the terminal includes: the first DNN, and the service area of the first DNN includes a handover target area.

In a seventh aspect, an embodiment of the present disclosure also provides a communication device, including: a processor, a memory, and a program stored on the memory and capable of running on the processor. When the program is executed by the processor, The implementation includes the steps of the service area switching processing method as described in the first aspect.

In an eighth aspect, the embodiments of the present disclosure also provide a computer-readable storage medium having a computer program stored on the computer-readable storage medium, and when the computer program is executed by a processor, it includes the service as described in the first aspect. Steps of the zone switching processing method.

In the embodiment of the present disclosure, since the service area of the first DNN includes the handover target area, when the terminal enters the handover target area, the PDU session corresponding to the first DNN is acquired to ensure the continuity of the PDU session of the terminal.

Description of the drawings

By reading the detailed description of the optional embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only used for the purpose of showing alternative embodiments, and are not considered as a limitation to the present disclosure. Also, throughout the drawings, the same reference symbols are used to denote the same components. In the attached picture:

Figure 1 is one of the schematic diagrams of network coverage;

Figure 2 is the second schematic diagram of network coverage;

FIG. 3 is one of the flowcharts of the service area switching processing method according to an embodiment of the disclosure;

4 is the second flowchart of the service area switching processing method according to the embodiment of the disclosure;

FIG. 5 is the third flowchart of the service area switching processing method according to an embodiment of the disclosure;

FIG. 6 is the fourth flow chart of the service area switching processing method according to an embodiment of the disclosure;

FIG. 7 is the fifth flowchart of the service area switching processing method according to an embodiment of the disclosure;

FIG. 8 is the sixth flowchart of the service area switching processing method according to an embodiment of the disclosure;

FIG. 9 is the seventh flowchart of the service area switching processing method according to an embodiment of the disclosure;

FIG. 10 is one of the schematic diagrams of AMF according to an embodiment of the disclosure;

FIG. 11 is the second schematic diagram of the AMF according to the embodiment of the disclosure;

FIG. 12 is one of the schematic diagrams of the SMF of the embodiment of the disclosure;

FIG. 13 is the second schematic diagram of the SMF of the embodiment of the disclosure;

FIG. 14 is a schematic diagram of a network device according to an embodiment of the disclosure.

Detailed ways

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

The term "including" in the specification and claims of this application and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to clear Instead, those steps or units listed below may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment. In addition, the use of "and/or" in the specification and claims means at least one of the connected objects, such as A and/or B, which means that it includes A alone, B alone, and there are three cases for both A and B.

In the embodiments of the present disclosure, words such as "exemplary" or "for example" are used as examples, illustrations, or illustrations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present disclosure should not be construed as being more preferable or advantageous than other embodiments or design solutions. To be precise, words such as "exemplary" or "for example" are used to present related concepts in a specific manner.

The technology described in this article is not limited to Long Time Evolution (LTE)/LTE-Advanced (LTE-A) systems, and can also be used in various wireless communication systems, such as Code Division Multiple Access (Code Division). Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Single-carrier Frequency-Division Multiple Access (SC-FDMA) and other systems.

The terms "system" and "network" are often used interchangeably. The CDMA system can implement radio technologies such as CDMA2000 and Universal Terrestrial Radio Access (UTRA). UTRA includes Wideband Code Division Multiple Access (WCDMA) and other CDMA variants. The TDMA system can implement radio technologies such as the Global System for Mobile Communication (GSM). OFDMA system can realize such as Ultra Mobile Broadband (UMB), Evolved UTRA (Evolution-UTRA, E-UTRA), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. Radio technology. UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS). LTE and more advanced LTE (such as LTE-A) are new UMTS versions that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The techniques described in this article can be used for the systems and radio technologies mentioned above, as well as other systems and radio technologies.

Referring to FIG. 3, an embodiment of the present disclosure provides a service area switching processing method. The execution subject of the method may be Access and Mobility Management Function (AMF), including: step 301 and step 302.

Step 301: Receive a handover request (handover required);

In the embodiment of the present disclosure, the handover request is used to request handover from the source area (for example, the source cell) to the target area (for example, the target cell).

The 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) has defined the Local Area Data Network (LADN) for 5G. This feature can realize the limitation of the business area within 5G. The purpose is to enable the terminal to use DNN only in a specific geographic area. Among them, the geographic area is described in the network through the Tracking Area (TA) list. For example, the network standard of the source area supports the LADN feature, for example, the network of the source area is 5G, and the network of the target area does not support the LADN feature. For example, the network standard of the target area is the fourth generation mobile communication technology (4G). Not limited to this. Referring to Figure 2, in the coverage scenario shown in Figure 2, if the user moves outside the campus, the network side cannot judge the LADN because the Evolved Packet Core (EPC) does not support the LADN feature.

It is understandable that DNN can be divided into two types, one is LADN-related DNN and LADN-independent DNN. For a LADN-related DNN, its service area includes one or more specific TAs, which are configured in the AMF; for a LADN-independent DNN, its service area can be considered to include all TAs.

Optionally, the handover request includes: an identifier of the handover target area, for example: Tracking Area Identity (TAI).

Step 302: Obtain the session management context (SM context) of the packet data unit (PDU) session corresponding to the first data network name (Data Network Name, DNN) of the terminal, and send the re-transmission to the mobility management entity (MME). A relocation request, where the relocation request includes: the session management context of the PDU session corresponding to the first DNN;

The DNN currently accessed by the terminal includes the first DNN, and the service area of the first DNN includes the handover target area.

In the embodiments of the present disclosure, the service area can be understood as an area where LADN services are provided, that is, the service area is equivalent to the LADN range. The service area of the first DNN currently accessed by the terminal includes the handover target area, which is equivalent to that the terminal is in the available range of LADN (or the terminal is within the LADN service area), and the service area of the second DNN currently accessed by the terminal does not include the handover target area It is equivalent to that the terminal is not in the available range of LADN (or the terminal is outside the LADN service area).

In the embodiments of the present disclosure, the handover target area may be understood as the handover target tracking area, and the handover target tracking area may cover one or more handover target cells.

In the embodiment of the present disclosure, since the service area of the first DNN includes the handover target area, when the terminal enters the handover target area, the PDU session corresponding to the first DNN is acquired to ensure the continuity of the PDU session of the terminal.

Referring to FIG. 4, an embodiment of the present disclosure provides a service area switching processing method. The execution body of the method may be AMF, and includes: step 401, step 402, step 403, and step 404.

Step 401: Receive a handover request;

Step 402: Send a session management context acquisition request to a session management function (Session Management Function, SMF), where the session management context acquisition request includes: the session management context identifier (for example, SmContextRef) of the PDU session corresponding to the first DNN;

The DNN currently accessed by the terminal includes: a first DNN and a second DNN, the service area of the first DNN includes the handover target area, and the service area of the second DNN does not include the handover target area. Since the service area of the second DNN does not include the handover target area, in order to prevent the user from being restricted after the handover, it is necessary to restrict the switching of the PDU session corresponding to the second DNN, that is, only switch the PDU session corresponding to the first DNN.

It is understandable that the AMF can determine whether the service area corresponding to the DNN currently accessed by the terminal contains the handover target area, and only obtain the session management context of the PDU session corresponding to the first DNN from the SMF, that is, only obtain the session of the PDU session that can be switched Manage context.

Optionally, before step 402, the method shown in FIG. 4 may further include: determining whether the service area corresponding to the DNN currently accessed by the terminal includes the handover target area.

For example, according to the active DNN list, the identifier of the handover target area, and service area information, determine whether the service area corresponding to the DNN currently accessed by the terminal includes the handover target area;

Wherein, the service area information indicates the corresponding relationship between the DNN and the service area identifier.

The above list of active DNNs includes information about one or more active DNNs, where active DNNs refer to DNNs that have established PDU sessions, for example: 10 DNNs, among which DNN1, DNN2, DNN3 have established PDU sessions, and DNN4-DNN10 do not When a PDU session is established, the active DNN list includes related information of DNN1, DNN2, and DNN3.

For example, the session management context acquisition request may be Nsmf_PDUSession_ContextRequest, but of course it is not limited to this.

Step 403: Receive the session management context of the PDU session corresponding to the first DNN sent by the SMF;

Step 404: Send a relocation request to the MME, where the relocation request includes: the session management context of the PDU session corresponding to the first DNN;

In some embodiments, after the handover is completed, the AMF sends a PDU session release request to the SMF. The PDU session release request includes: the identifier of the PDU session corresponding to the second DNN, that is, the AMF can initiate a The release process of the PDU session.

In the embodiment of the present disclosure, since the service area of the first DNN includes the handover target area, when the terminal enters the handover target area, the PDU session corresponding to the first DNN is obtained to ensure the continuity of the PDU session of the terminal. Further, In the embodiments of the present disclosure, the PDU session switching corresponding to the second DNN can be restricted, because the service area of the second DNN does not include the switching target area. In order to avoid the restriction of the user's use area after switching, it is necessary to restrict the second DNN corresponding Switching of PDU sessions.

Referring to FIG. 5, an embodiment of the present disclosure provides a service area switching processing method. The execution subject of the method may be AMF, including: step 501, step 502, step 503, and step 504.

Step 501: Receive a handover request;

Step 502: Send a session management context acquisition request to the session management function SMF, where the session management context acquisition request includes: the session management context identifier (for example, SmContextRef) and indication information of the PDU session corresponding to the first DNN. The indication information indicates: whether the service area corresponding to the DNN related to the session management context includes the handover target area;

It is understandable that the indication information can be one bit of information, for example, "1" means that the service area corresponding to the DNN currently accessed by the terminal includes the handover target area, and "0" means that the service area corresponding to the DNN currently accessed by the terminal does not include handover The target area is of course not limited to this.

The DNN currently accessed by the terminal includes: a first DNN and a second DNN, the service area of the first DNN includes a handover target area, and the service area of the second DNN does not include the handover target area. Since the service area of the second DNN does not include the handover target area, in order to prevent the user from being restricted after the handover, it is necessary to restrict the switching of the PDU session corresponding to the second DNN, that is, only switch the PDU session corresponding to the first DNN.

Optionally, before step 502, the method further includes: determining whether the service area corresponding to the DNN currently accessed by the terminal includes the handover target area.

For example, according to the active DNN list, the identifier of the handover target area, and service area information, determine whether the service area corresponding to the DNN currently accessed by the terminal includes the handover target area;

Wherein, the service area information indicates the corresponding relationship between the DNN and the service area identifier.

Step 503: Receive the session management context of the PDU session corresponding to the first DNN sent by the SMF;

Step 504: Send a relocation request to the MME, where the relocation request includes: the session management context of the PDU session corresponding to the first DNN;

It is understandable that in the embodiment shown in FIG. 5, the AMF initiates a session management context acquisition request for each active PDU session, and the acquisition request includes indicating whether the service area corresponding to the DNN currently accessed by the terminal is Contains instructions for switching the target area.

Among them, for indicating that the service area corresponding to the DNN currently accessed by the terminal contains the indication information of the handover target area, the SMF can reply to the session management context of the PDU session corresponding to the DNN; and for indicating that the service area corresponding to the DNN currently accessed by the terminal is not Contains instructions for switching the target area, and SMF can reply with a failure response.

In some implementation manners, the method further includes: receiving a failure message sent by the SMF according to the indication information; wherein the failure message indicates a failure to obtain the session management context of the PDU session corresponding to the second DNN.

In the embodiment of the present disclosure, since the service area of the first DNN includes the handover target area, when the terminal enters the handover target area, the PDU session corresponding to the first DNN is obtained to ensure the continuity of the PDU session of the terminal. Further, In the embodiments of the present disclosure, the PDU session switching corresponding to the second DNN can be restricted, because the service area of the second DNN does not include the switching target area. In order to avoid the restriction of the user's use area after switching, it is necessary to restrict the second DNN corresponding Switching of PDU sessions.

Referring to FIG. 6, an embodiment of the present disclosure also provides a service area switching processing method, the execution body of the method is SMF, and specifically includes: step 601.

Step 601: Send the session management context of the PDU session corresponding to the first DNN of the terminal to the AMF;

The DNN currently accessed by the terminal includes: the first DNN, and the service area of the first DNN includes a handover target area.

In the embodiment of the present disclosure, since the service area of the first DNN includes the handover target area, when the terminal enters the handover target area, the PDU session corresponding to the first DNN is acquired to ensure the continuity of the PDU session of the terminal.

Referring to FIG. 7, an embodiment of the present disclosure also provides a service area switching processing method, the execution body of the method is SMF, and specifically includes: step 701 and step 702.

Step 701: Receive a session management context acquisition request from the AMF, where the session management context acquisition request includes: an identifier of the session management context of the PDU session corresponding to the first DNN;

The DNN currently accessed by the terminal includes: a first DNN and a second DNN, the service area of the first DNN includes a handover target area, and the service area of the second DNN does not include the handover target area. Since the service area of the second DNN does not include the handover target area, in order to avoid the restriction of the user's use area after the switch, it is necessary to restrict the switch of the PDU session corresponding to the second DNN at this time.

Step 702: Send the session management context of the PDU session corresponding to the first DNN to the AMF according to the session management context acquisition request

In some implementation manners, after the handover is completed, the method may further include: receiving a PDU session release request sent by the AMF, where the PDU session release request includes: an identifier of the PDU session corresponding to the second DNN; and release The PDU session corresponding to the second DNN, or the PDU session corresponding to the second DNN is maintained.

In the embodiment of the present disclosure, since the service area of the first DNN includes the handover target area, when the terminal enters the handover target area, the PDU session corresponding to the first DNN is obtained to ensure the continuity of the PDU session of the terminal. Further, In the embodiments of the present disclosure, the PDU session switching corresponding to the second DNN can be restricted, because the service area of the second DNN does not include the switching target area. In order to avoid the restriction of the user's use area after switching, it is necessary to restrict the second DNN corresponding Switching of PDU sessions.

Referring to FIG. 8, an embodiment of the present disclosure also provides a service area switching processing method. The execution body of the method is SMF, and specifically includes: step 801 and step 802.

Step 801: Receive a session management context acquisition request from the AMF, where the session management context acquisition request includes: the identifier and indication information of the session management context of the PDU session corresponding to the first DNN, and the indication information indicates that the session management context is relevant Whether the service area corresponding to the DNN includes the handover target area;

The DNN currently accessed by the terminal includes: a first DNN and a second DNN, the service area of the first DNN includes a handover target area, and the service area of the second DNN does not include the handover target area. Since the service area of the second DNN does not include the handover target area, in order to prevent the user from being restricted after the handover, it is necessary to restrict the switching of the PDU session corresponding to the second DNN, that is, only switch the PDU session corresponding to the first DNN.

Step 802: Send the session management context of the PDU session corresponding to the first DNN to the AMF according to the session management context acquisition request

Wherein, the DNN currently accessed by the terminal includes: the first DNN and the second DNN, the service area of the first DNN includes the handover target area, and the service area of the second DNN does not include the handover target area .

In some embodiments, after the handover is completed, the method may further include: maintaining the PDU session corresponding to the second DNN according to a pre-configured policy; or initiating a PDU session release procedure corresponding to the second DNN. Further, the pre-configured policy is configured locally by the SMF; or, it is derived from a Policy Control Function (PCF).

In some embodiments, for an unswitched PDU session, the method shown in FIG. 8 may further include: sending a failure message to the AMF; wherein, the failure message indicates a session for obtaining the PDU session corresponding to the second DNN Failed to manage context.

In the embodiment of the present disclosure, since the service area of the first DNN includes the handover target area, when the terminal enters the handover target area, the PDU session corresponding to the first DNN is obtained to ensure the continuity of the PDU session of the terminal. Further, In the embodiments of the present disclosure, the PDU session switching corresponding to the second DNN can be restricted, because the service area of the second DNN does not include the switching target area. In order to avoid the restriction of the user's use area after switching, it is necessary to restrict the second DNN corresponding Switching of PDU sessions.

The following introduces the solution of service area restriction in the scenario of 5G to 4G interoperability as an example, see Figure 9, including the following steps:

Step 901: AMF configures service area information.

The service area information configured locally by the AMF includes: DNN and the corresponding TAI list, and the AMF determines the service area of each DNN through the service area information.

Step 902: When a 5G to 4G handover needs to be performed, the Next Generation Radio Access Network (NG-RAN) sends a handover request message to the AMF.

Further, the handover request message includes: the identification (eNB ID) of the target base station and the target TAI. AMF extracts the target TAI from the Handover Required message.

Step 903: The AMF determines whether the target tracking area is within the service area.

The AMF generates a UE-related active DNN list according to the information stored when the UE establishes a PDU session before, and then generates Table 1 in combination with the service area information in step 501 and the target TAI.

Table 1:

Active DNN logo	Whether the target cell is in the service area
DNN1	Yes

DNN 2	no
...	...

Step 904: The AMF transmits an indication of whether the user is in the service area to the SMF.

In the handover process, the AMF needs to obtain the current PDU session context information of the UE from the SMF, and use it to pass it to the target mobility management entity (Mobility Management Entity, MME).

For example, AMF sends the following HyperText Transfer Protocol (HTTP) request message through a service-oriented interface:

POST/nsmf-pdusession/{apiVersion}/sm-contexts/{smContextRef}/retrieve

The message body carried in the above HTTP request message is a JSON structure of SmContextRetrieveData type, which carries input parameters related to the context acquisition operation.

Optionally, a new attribute "targetWithinServingArea" is added to the SmContextRetrieveData data structure, and this attribute includes Table 1.

Step 905: The SMF returns the session management context of the PDU session to the AMF.

After SMF receives the session management context acquisition request of the AMF PDU session, it determines the PDU session that can be switched according to the targetWithinServingArea attribute content, and returns only the session management context of the PDU session that can be switched to the AMF:

For example, the targetWithinServingArea attribute contains the following Table 2.

Table 2:

DNN logo	Whether the target cell is in the service area
DNN1	Yes
DNN2	no
DNN3	Yes

Then, the SMF only contains the session management context of the PDU session related to DNN1 and DNN3 in the response message.

Step 906: SMF processes the unswitched PDU session.

For PDU sessions that are not handed over, SMF can perform the following operations on a DNN-by-DNN basis according to a preset strategy:

1) Maintain the PDU session in case the subsequent user returns to the service area; or,

2) The SMF initiates the PDU session release process to remove the unswitched PDU session. For example, the SMF can wait for a certain period of time according to a preset strategy before initiating the release of the PDU session.

Optionally, SMF can obtain the aforementioned preset strategy in the following manner:

1) Local configuration; or,

2) Obtain relevant strategies through PCF.

In the embodiments of the present disclosure, it is possible to implement service area restriction from a network that supports the LADN feature to a network that does not support the LADN feature, and to improve the reliability of the communication system.

Referring to FIG. 10, an embodiment of the present disclosure provides an AMF, and the AMF 1000 includes:

The first receiving module 1001 is configured to receive a handover request;

The first sending module 1002 is configured to send a relocation request to the MME when acquiring the session management context of the PDU session corresponding to the first DNN of the terminal, where the relocation request includes: the session of the PDU session corresponding to the first DNN Management context

The DNN currently accessed by the terminal includes the first DNN, and the service area of the first DNN includes the handover target area.

In some implementation manners, the first sending module 1002 is further configured to: send a session management context acquisition request to the SMF, where the session management context acquisition request includes: the identifier of the session management context of the PDU session corresponding to the first DNN; A receiving module 1001 is further configured to: receive the session management context of the PDU session corresponding to the first DNN sent by the SMF; wherein the DNN currently accessed by the terminal further includes: a second DNN, the second DNN The service area of does not include the handover target area.

In some implementation manners, the first sending module 1002 is further configured to send a PDU session release request to the SMF, where the PDU session release request includes: an identifier of the PDU session corresponding to the second DNN.

In some implementation manners, the session management context acquisition request further includes: indication information indicating whether the service area corresponding to the DNN related to the session management context includes the handover target area.

In some implementation manners, the first receiving module 1001 is further configured to: receive a failure message sent by the SMF according to the indication information; wherein, the failure message indicates obtaining the session management context of the PDU session corresponding to the second DNN failure.

In some implementation manners, the AMF 1000 further includes: a determining module, configured to determine whether the service area corresponding to the DNN currently accessed by the terminal includes the handover target area.

In some embodiments, the determining module is further used to determine whether the service area corresponding to the DNN currently accessed by the terminal contains the handover target according to the active DNN list, the identifier of the handover target area, and service area information Area; wherein, the service area information indicates the correspondence between the DNN and the service area identifier.

The AMF provided by the embodiment of the present disclosure may execute the method embodiment shown in FIG. 3, FIG. 4, or FIG. 5, and its implementation principles and technical effects are similar, and will not be repeated here in this embodiment.

Referring to FIG. 11, an embodiment of the present disclosure provides an AMF. The AMF 1100 includes: a first transceiver 1101 and a first processor 1102;

The first transceiver 1101 is configured to receive a handover request;

The first transceiver 1101 is further configured to obtain the session management context of the PDU session corresponding to the first DNN of the terminal, and send a relocation request to the MME, where the relocation request includes: session management of the PDU session corresponding to the first DNN Context

The DNN currently accessed by the terminal includes the first DNN, and the service area of the first DNN includes the handover target area.

In some embodiments, the first transceiver 1101 is further configured to: send a session management context acquisition request to the SMF, where the session management context acquisition request includes: an identifier of the session management context of the PDU session corresponding to the first DNN; A transceiver 1101 is further configured to: receive the session management context of the PDU session corresponding to the first DNN sent by the SMF; wherein the DNN currently accessed by the terminal further includes: a second DNN, the second DNN The service area of does not include the handover target area.

In some implementation manners, the first transceiver 1101 is further configured to send a PDU session release request to the SMF, where the PDU session release request includes: an identifier of the PDU session corresponding to the second DNN.

In some implementation manners, the session management context acquisition request further includes: indication information indicating whether the service area corresponding to the DNN related to the session management context includes the handover target area.

In some implementation manners, the first transceiver 1101 is further configured to: receive a failure message sent by the SMF according to the indication information; wherein, the failure message indicates obtaining the session management context of the PDU session corresponding to the second DNN failure.

In some implementation manners, the first processor 1102 is configured to determine whether the service area corresponding to the DNN currently accessed by the terminal includes the handover target area.

In some implementation manners, the first processor 1102 is further configured to determine whether the service area corresponding to the DNN currently accessed by the terminal contains all the service areas according to the active DNN list, the identifier of the handover target area, and service area information. The handover target area; wherein the service area information indicates the corresponding relationship between the DNN and the service area identifier.

The AMF provided by the embodiment of the present disclosure may execute the method embodiment shown in FIG. 3, FIG. 4, or FIG. 5, and its implementation principles and technical effects are similar, and will not be repeated here in this embodiment.

Referring to FIG. 12, an embodiment of the present disclosure further provides an SMF, and the SMF 1200 includes:

The second sending module 1201 is configured to send the session management context of the PDU session corresponding to the first DNN of the terminal to the AMF;

The DNN currently accessed by the terminal includes: the first DNN, and the service area of the first DNN includes a handover target area.

In some implementation manners, the SMF 1200 further includes: a second receiving module, configured to receive a session management context acquisition request from the AMF, where the session management context acquisition request includes: the session management context of the PDU session corresponding to the first DNN The logo;

The second sending module 1201 is further configured to send the session management context of the PDU session corresponding to the first DNN to the AMF according to the session management context acquisition request; wherein, the DNN currently accessed by the terminal further includes: DNN, the service area of the second DNN does not include the handover target area.

In some implementation manners, the SMF 1200 further includes: a third receiving module, configured to receive a PDU session release request sent by the AMF, where the PDU session release request includes: the identifier of the PDU session corresponding to the second DNN; The PDU session corresponding to the second DNN, or the PDU session corresponding to the second DNN is maintained.

In some implementation manners, the session management context acquisition request further includes: indication information indicating whether the service area corresponding to the DNN related to the session management context includes the handover target area.

In some embodiments, the SMF 1200 further includes: a processing module, configured to maintain the PDU session corresponding to the second DNN according to a pre-configured strategy; or, to initiate a PDU session release procedure corresponding to the second DNN.

In some embodiments, the pre-configured policy is configured locally by the SMF; or, it is obtained from the PCF.

In some implementation manners, the second sending module 1201 is further configured to send a failure message to the AMF; where the failure message indicates a failure to obtain the session management context of the PDU session corresponding to the second DNN.

The SMF provided by the embodiments of the present disclosure can execute the method embodiments shown in FIG. 6, FIG. 7 and FIG. 8, and its implementation principles and technical effects are similar, and will not be repeated here in this embodiment.

Referring to FIG. 13, an embodiment of the present disclosure also provides an SMF, and the SMF 1300 includes: a second transceiver 1301 and a second processor 1302;

The second transceiver 1301 is configured to send the session management context of the PDU session corresponding to the first DNN of the terminal to the AMF;

The DNN currently accessed by the terminal includes: the first DNN, and the service area of the first DNN includes a handover target area.

In some embodiments, the second transceiver 1301 is further configured to receive a session management context acquisition request from the AMF, where the session management context acquisition request includes: the identifier of the session management context of the PDU session corresponding to the first DNN ；

The second transceiver 1301 is further configured to send the session management context of the PDU session corresponding to the first DNN to the AMF according to the session management context acquisition request; wherein, the DNN currently accessed by the terminal further includes: DNN, the service area of the second DNN does not include the handover target area.

In some embodiments, the second transceiver 1301 is further configured to receive a PDU session release request sent by the AMF, where the PDU session release request includes: the identifier of the PDU session corresponding to the second DNN; The PDU session corresponding to the second DNN, or the PDU session corresponding to the second DNN is maintained.

In some implementation manners, the session management context acquisition request further includes: indication information indicating whether the service area corresponding to the DNN related to the session management context includes the handover target area.

In some embodiments, the second processor 1302 is configured to maintain the PDU session corresponding to the second DNN according to a pre-configured policy; or, initiate a PDU session release procedure corresponding to the second DNN.

In some embodiments, the pre-configured policy is configured locally by the SMF; or, it is obtained from the policy control function PCF.

In some implementation manners, the second transceiver 1301 is further configured to send a failure message to the AMF; wherein the failure message indicates a failure to obtain the session management context of the PDU session corresponding to the second DNN.

The SMF provided by the embodiments of the present disclosure can execute the method embodiments shown in FIG. 6, FIG. 7 and FIG. 8, and its implementation principles and technical effects are similar, and will not be repeated here in this embodiment.

Please refer to FIG. 14. FIG. 14 is a structural diagram of a communication device applied in an embodiment of the present disclosure. As shown in FIG. 14, the communication device 1400 includes a processor 1401, a transceiver 1402, a memory 1403, and a bus interface. The processor 1401 Can be responsible for managing the bus architecture and general processing. The memory 1403 may store data used by the processor 1401 when performing operations.

In an embodiment of the present disclosure, the communication device 1400 further includes: a program that is stored in the memory 1403 and can be run on the processor 1401. When the program is executed by the processor 1401, the above-mentioned Figures 3, 4, 5, and 5 are implemented. 6. Steps in the method shown in Figure 7 or Figure 8.

In FIG. 14, the bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 1401 and various circuits of the memory represented by the memory 1403 are linked together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are all known in the art, and therefore, will not be further described herein. The bus interface provides the interface. The transceiver 1402 may be a plurality of elements, that is, including a transmitter and a receiver, and provide a unit for communicating with various other devices on the transmission medium.

The communication device provided by the embodiment of the present disclosure can execute the method embodiment shown in FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7 or FIG. Go into details.

The embodiments of the present disclosure also provide a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, each process of the foregoing method for adjusting the configuration of computing resources is implemented, and To achieve the same technical effect, in order 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.

The steps of the method or algorithm described in connection with the disclosure of the present disclosure may be implemented in a hardware manner, or may be implemented in a manner of executing software instructions on a processor. The software instructions can be composed of corresponding software modules, and the software modules can be stored in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disks, mobile hard disks, read-only optical disks, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and storage medium can be carried in an ASIC. In addition, the ASIC can be carried in the core network interface device. Of course, the processor and the storage medium may also exist as discrete components in the core network interface device.

Those skilled in the art should be aware that, in one or more of the foregoing examples, the functions described in the present disclosure can be implemented by hardware, software, firmware, or any combination thereof. When implemented by software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on the computer-readable medium. The computer-readable medium includes a computer storage medium and a communication medium, where the communication medium includes any medium that facilitates the transfer of a computer program from one place to another. The storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer.

The specific embodiments described above further describe the purpose, technical solutions, and beneficial effects of the present disclosure in further detail. It should be understood that the above descriptions are only specific embodiments of the present disclosure, and are not intended to limit the scope of the present disclosure. The protection scope, any modification, equivalent replacement, improvement, etc. made on the basis of the technical solution of the present disclosure shall be included in the protection scope of the present disclosure.

Those skilled in the art should understand that the embodiments of the present disclosure can be provided as a method, a system, or a computer program product. Therefore, the embodiments of the present disclosure may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the embodiments of the present disclosure may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

The embodiments of the present disclosure are described with reference to the flowcharts and/or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are generated It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment. The instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

It should be noted that it should be understood that the above division of each module is only a division of logical functions, and can be fully or partially integrated into a physical entity during actual implementation, or can be physically separated. And these modules can all be implemented in the form of software called by processing elements; they can also be implemented in the form of hardware; some modules can be implemented in the form of calling software by processing elements, and some of the modules can be implemented in the form of hardware. For example, the determining module may be a separately established processing element, or it may be integrated in a chip of the above-mentioned device for implementation. In addition, it may also be stored in the memory of the above-mentioned device in the form of program code, and a certain processing element of the above-mentioned device Call and execute the functions of the above-identified module. The implementation of other modules is similar. In addition, all or part of these modules can be integrated together or implemented independently. The processing element described here may be an integrated circuit with signal processing capability. In the implementation process, each step of the above method or each of the above modules can be completed by an integrated logic circuit of hardware in the processor element or instructions in the form of software.

For example, each module, unit, sub-unit or sub-module may be one or more integrated circuits configured to implement the above method, for example: one or more application specific integrated circuits (ASIC), or, one or Multiple microprocessors (digital signal processors, DSP), or one or more field programmable gate arrays (Field Programmable Gate Array, FPGA), etc. For another example, when one of the above modules is implemented in the form of processing element scheduling program code, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processors that can call program codes. For another example, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).

The terms "first", "second", etc. in the specification and claims of the present disclosure are used to distinguish similar objects, and not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein are, for example, implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those clearly listed. Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment. In addition, the use of "and/or" in the description and claims means at least one of the connected objects, such as A and/or B and/or C, which means that it includes A alone, B alone, C alone, and both A and B. Exist, B and C exist, A and C exist, and A, B, and C all exist in 7 situations. Similarly, the use of "at least one of A and B" in this specification and claims should be understood as "A alone, B alone, or both A and B exist".

Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present disclosure without departing from the spirit and scope of the present disclosure. In this way, if these modifications and variations of the embodiments of the present disclosure fall within the scope of the claims of the present disclosure and their equivalent technologies, the present disclosure is also intended to include these modifications and variations.

Claims (20)

1. A service area switching processing method, applied to access and mobility management function AMF, includes:

   Receive handover request;

   Obtain the session management context of the PDU session of the packet data unit corresponding to the first data network name DNN of the terminal, and send a relocation request to the mobility management entity MME, where the relocation request includes: the session of the PDU session corresponding to the first DNN Management context

   Wherein, the DNN currently accessed by the terminal includes: the first DNN, and the service area of the first DNN includes a handover target area.
2. The method according to claim 1, further comprising:

   Sending a session management context acquisition request to the session management function SMF, where the session management context acquisition request includes: the identifier of the session management context of the PDU session corresponding to the first DNN;

   Receiving the session management context of the PDU session corresponding to the first DNN sent by the SMF;

   Wherein, the DNN currently accessed by the terminal further includes: a second DNN, and the service area of the second DNN does not include the handover target area.
3. The method according to claim 2, further comprising:

   A PDU session management context release request is sent to the SMF, where the PDU session management context release request includes: an identifier of the session management context of the PDU session corresponding to the second DNN.
4. The method according to claim 2, wherein the session management context acquisition request further comprises: indication information, the indication information indicating whether the service area corresponding to the DNN related to the session management context includes a handover target area.
5. The method according to claim 4, further comprising:

   Receiving a failure message sent by the SMF according to the indication information;

   Wherein, the failure message indicates that obtaining the session management context of the PDU session corresponding to the second DNN fails.
6. The method according to claim 2, wherein before the sending the session management context acquisition request of the PDU session to the SMF, the method further comprises:

   It is determined whether the service area corresponding to the DNN currently accessed by the terminal includes the handover target area.
7. The method according to claim 6, wherein the determining whether the service area corresponding to the DNN currently accessed by the terminal includes the handover target area comprises:

   Determining, according to the active DNN list, the identifier of the handover target area, and service area information, whether the service area corresponding to the DNN currently accessed by the terminal includes the handover target area;

   Wherein, the service area information indicates the corresponding relationship between the DNN and the service area identifier.
8. A service area switching processing method, applied to SMF, includes:

   Sending the session management context of the PDU session corresponding to the first DNN of the terminal to the AMF;

   The DNN currently accessed by the terminal includes: the first DNN, and the service area of the first DNN includes a handover target area.
9. The method according to claim 8, wherein the sending the session management context of the PDU session corresponding to the first DNN to the AMF comprises:

   Receiving a session management context acquisition request from the AMF, where the session management context acquisition request includes: an identifier of the session management context of the PDU session corresponding to the first DNN;

   Sending the session management context of the PDU session corresponding to the first DNN to the AMF according to the session management context acquisition request;

   Wherein, the DNN currently accessed by the terminal further includes: a second DNN, and the service area of the second DNN does not include the handover target area.
10. The method according to claim 9, further comprising:

    Receiving a PDU session management context release request sent by the AMF, where the PDU session management context release request includes: an identifier of the session management context of the PDU session corresponding to the second DNN;

    Release the PDU session corresponding to the second DNN, or keep the PDU session corresponding to the second DNN.
11. The method according to claim 9, wherein the session management context acquisition request further comprises: indication information indicating whether the service area corresponding to the DNN related to the session management context includes a handover target area.
12. The method according to claim 11, further comprising:

    According to a pre-configured policy, maintain the PDU session corresponding to the second DNN; or initiate a PDU session release procedure corresponding to the second DNN.
13. The method according to claim 12, wherein the pre-configured policy is configured locally by the SMF; alternatively, it is obtained from a policy control function (PCF).
14. The method according to claim 11, further comprising:

    Sending a failure message to the AMF;

    Wherein, the failure message indicates that obtaining the session management context of the PDU session corresponding to the second DNN fails.
15. A type of AMF, including:

    The first receiving module is configured to receive a handover request;

    The first sending module is configured to obtain the session management context of the PDU session corresponding to the first DNN of the terminal, and send a relocation request to the MME, where the relocation request includes: the session management context of the PDU session corresponding to the first DNN;

    The DNN currently accessed by the terminal includes the first DNN, and the service area of the first DNN includes the handover target area.
16. An AMF, including: a first transceiver and a first processor;

    The first transceiver is used to receive a handover request;

    The first transceiver is also used to obtain the session management context of the PDU session corresponding to the first DNN of the terminal, and send a relocation request to the MME, where the relocation request includes: the session of the PDU session corresponding to the first DNN Management context

    The DNN currently accessed by the terminal includes the first DNN, and the service area of the first DNN includes the handover target area.
17. A type of SMF, including:

    The second sending module is configured to send the session management context of the PDU session corresponding to the first DNN of the terminal to the AMF;

    The DNN currently accessed by the terminal includes: the first DNN, and the service area of the first DNN includes a handover target area.
18. An SMF, including: a second transceiver and a second processor;

    The second transceiver is configured to send the session management context of the PDU session corresponding to the first DNN of the terminal to the AMF;

    The DNN currently accessed by the terminal includes: the first DNN, and the service area of the first DNN includes a handover target area.
19. A communication device, comprising: a processor, a memory, and a program stored on the memory and capable of running on the processor, the program being executed by the processor including any one of claims 1 to 14 One of the steps of the service area switching processing method.
20. A computer-readable storage medium having a computer program stored on the computer-readable storage medium, and when the computer program is executed by a processor, the implementation includes the service area switching processing method according to any one of claims 1 to 14 A step of.

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