PDN connection deletion method and electronic device for interoperability between 4G network and 5G network

Abstract

The present application discloses a method and electronic device for deleting a PDN connection for interoperability between a 4G network and a 5G network. The solution provided by the present application includes: receiving a context acquisition request sent by an access and mobility management function (AMF); obtaining the mobility management state context of the 4G network of the UE and the session management context of the target PDN, wherein the session management context carries the connection type of the target PDN, and the connection type includes a first connection type that supports interoperability between the 4G network and the 5G network and a second connection type that does not support interoperability between the 4G network and the 5G network; in response to the context acquisition request, sending the mobility management state context and the target context in the session management context to the AMF; after receiving a response message from the AMF to the target context, deleting the target PDN connection, wherein the response message carries a gateway change indication corresponding to the target PDN connection.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a method and electronic device for deleting a PDN connection for interoperability between a 4G network and a 5G network. Background Art

[0002] In the absence of perfect 5G network coverage, to ensure continuous user service experience, using 4G networks as an effective supplement to 5G networks will be an essential stage in the 5G evolution process. During this process, interoperability between systems under the coexistence of 4G and 5G networks will appear over a long period of time.

[0003] The Public Data Network (PDN) Gateway (PGW) and Session Management Function (SMF) serve as session control network elements and are also the control plane anchor points for sessions during the interoperability between 4G and 5G. The integrated deployment of PGW and SMF plays an important role in ensuring business continuity. Currently, when an independent PGW is selected to activate a PDN connection, the independent PGW does not support service-based interfaces and cannot achieve interoperability between the 4G network and the 5G network. PDN connections activated on an independent PGW cannot be migrated to the 5G network, resulting in these PDN connections being unable to be released for a long time, which will cause a large consumption of network resources.

[0004] Therefore, how to clearly understand the type of PDN connection during 4G / 5G network interoperability and avoid resource waste caused by PDN connections that do not support interoperability is a technical problem that needs to be solved at present. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a PDN connection deletion method and electronic device that are interoperable between 4G networks and 5G networks, so as to solve the problem that PDN connections may cause resource waste.

[0006] In order to solve the above technical problems, this specification is implemented as follows:

[0007] In a first aspect, a method for deleting a PDN connection for interoperability between a 4G network and a 5G network is provided, which is applied to a mobility management entity (MME). The method includes:

[0008] Receive a context acquisition request sent by the access and mobility management function AMF, where the context acquisition request carries the UE identifier requesting registration on the 5G network and the 5G network type identifier;

[0009] Obtain, according to the UE identifier and the 5G network type identifier, a mobility management state context of the 4G network of the UE and a session management context of the target PDN, wherein the session management context carries a connection type of the target PDN, and the connection type includes a first connection type that supports interoperability between the 4G network and the 5G network and a second connection type that does not support interoperability between the 4G network and the 5G network;

[0010] In response to the context acquisition request, send the mobility management state context and the target context in the session management context to the AMF, where the target context includes both the mobility management state context and the session management context, or only includes the mobility management state context;

[0011] After receiving a response message from the AMF to the target context, the target PDN connection is deleted, wherein the response message carries a gateway change indication corresponding to the target PDN connection.

[0012] In a second aspect, a PDN connection deletion method for interoperability between a 4G network and a 5G network is provided, which is applied to an access and mobility management function (AMF). The method includes:

[0013] Upon receiving a 5G network registration request initiated by the target UE, sending a context acquisition request to the MME, where the context acquisition request carries the identifier of the target UE and the 5G network type identifier;

[0014] Receiving the mobility management state context of the 4G network of the UE and the session management context of the target PDN sent by the MME in response to the context acquisition request, wherein the session management context carries the connection type of the target PDN, and the connection type includes a first connection type that supports interoperability between the 4G network and the 5G network and a second connection type that does not support interoperability between the 4G network and the 5G network;

[0015] After receiving the mobility management state context and the session management context, a response message carrying a gateway change indication corresponding to the target PDN connection is sent to the MME, wherein the MME is configured to delete the target PDN connection after receiving the response message.

[0016] In a third aspect, an electronic device is provided, comprising a memory and a processor electrically connected to the memory, wherein the memory stores a computer program that can be run by the processor, and when the computer program is executed by the processor, the steps of the method described in the first aspect or the second aspect are implemented.

[0017] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method described in the first aspect or the second aspect are implemented.

[0018] In an embodiment of the present application, by receiving a context acquisition request sent by an access and mobility management function AMF, the mobility management state context of the UE's 4G network and the session management context of the target PDN are obtained, wherein the session management context carries the connection type of the target PDN, and the connection type includes a first connection type that supports interoperability between 4G networks and 5G networks and a second connection type that does not support interoperability between 4G networks and 5G networks; in response to the context acquisition request, the mobility management state context and the target context in the session management context are sent to the AMF; after receiving a response message from the AMF to the target context, the target PDN connection is deleted. Thus, by marking the PDN connection that supports interoperability between 4G and 5G through the MME, the identification of the target PDN connection type can be simply and effectively achieved without changing the existing network architecture, so that the selected PDN connection that does not support interoperability between 4G and 5G can be deleted from the corresponding PGW to release the interface sessions on the PGW side and avoid unnecessary network resource consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 This is a flow chart of a PDN connection deletion method for interoperability between a 4G network and a 5G network according to the first embodiment of the present application.

[0021] Figure 2 This is a schematic diagram of the network device architecture of an embodiment of the present application.

[0022] Figure 3 This is a flow chart of a PDN connection deletion method for interoperability between a 4G network and a 5G network according to the second embodiment of the present application.

[0023] Figure 4 It is a structural block diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The figure numbers in this application are only used to distinguish the various steps in the scheme and are not used to limit the execution order of the various steps. The specific execution order is subject to the description in the specification.

[0025] In order to solve the problems existing in the prior art, the embodiment of the present application provides a PDN connection deletion method for interoperability between a 4G network and a 5G network, which is applied to a Mobility Management Entity (MME) device, such as Figure 1 As shown, the following steps are included:

[0026] Step 102: Receive a context acquisition request sent by the access and mobility management function (AMF), where the context acquisition request carries a UE identifier requesting registration on a 5G network and a 5G network type identifier.

[0027] Step 104: Acquire, based on the UE identifier and the 5G network type identifier, a mobility management state context of the 4G network of the UE and a session management context of the target PDN, wherein the session management context carries a connection type of the target PDN, and the connection type includes a first connection type that supports interoperability between the 4G network and the 5G network and a second connection type that does not support interoperability between the 4G network and the 5G network;

[0028] Step 106: In response to the context acquisition request, the mobility management state context and the target context in the session management context are sent to the AMF, where the target context includes both the mobility management state context and the session management context, or only includes the mobility management state context.

[0029] Step 108: After receiving a response message from the AMF to the target context, the target PDN connection is deleted, wherein the response message carries a gateway change indication corresponding to the target PDN connection.

[0030] The following combination Figure 2 The network equipment architecture of the embodiment describes the method of interoperability between the 4G network and the 5G network of the embodiment of the present application.

[0031] In step 102, the Access and Mobility Management Function (AMF) 20 sends a context acquisition request to the MME 30 after receiving a mobility update registration request initiated by the user equipment 10 in the idle state to move from the 4G network to the 5G network.

[0032] In step 104, after receiving the context acquisition request sent by AMF 20, MME 30 determines that UE 10 needs to switch from 4G network to 5G network based on the UE identifier and 5G network type identifier in the request, and thus obtains the mobility management state context corresponding to UE 10 and the session management context of the target PDN so as to send them to AMF 20 to establish a 5G connection for UE 10.

[0033] The target PDN is the PDN that is activated when the UE 10 activates a PDN connection in the 4G network. For example, a normal UE 10 can activate two PDN connections, one for Internet access and one for voice access.

[0034] In the embodiment of the present application, the session management context carries the connection type of the target PDN.

[0035] Optionally, before obtaining the mobility management state context of the 4G network of the UE and the session management context of the target PDN, the method further includes:

[0036] Determine the connection type of the target PDN according to the type of the target PDN gateway selected corresponding to the target PDN connection when the UE activates the PDN connection in the 4G network, where the type of the target PDN gateway includes a converged PGW / SMF gateway and an independent PGW gateway;

[0037] Sending a session creation request to the target PDN gateway, where the session creation request carries the connection type of the target PDN;

[0038] Receive a response message sent by the target PDN in response to the session generation request, wherein, when the connection type of the target PDN is the first connection type, the response message carries a 5G service quality parameter corresponding to the target PDN connection.

[0039] Whether the connection type of the target PDN carried in the session management context supports interoperability between 4G and 5G networks is determined by the type of PDN gateway (PDN GateWay, PGW) selected by the target PDN.

[0040] The converged PGW / SMF gateway supports interoperability between 4G and 5G networks, while the standalone PGW gateway supports only 4G networks and does not support interoperability between 4G and 5G networks. Therefore, the PDN connection to the converged PGW / SMF gateway is selected as the first connection type, which supports interoperability between 4G and 5G networks; the PDN connection to the standalone PGW is selected as the second connection type, which does not support interoperability between 4G and 5G networks.

[0041] In an embodiment of the present application, the connection type of the PDN can be implemented by introducing an identification field in the session management context, such as the 5GSIWKI field. The MME 30 marks the corresponding identification field according to whether the target UE 10 selects a PDN connection to a converged PGW / SMF or a PDN connection to an independent PGW. For example, for a PDN connection selected to a converged PGW / SMF, if the interoperability between the 4G network and the 5G network is supported, the 5GSIWKI field is set to 1. For a PDN connection selected to an independent PGW, if the interoperability between the 4G network and the 5G network is not supported, the 5GSIWKI field is set to 0. Then, the MME 30 saves the corresponding setting flag of the 5GSIWKI field to the corresponding session management context.

[0042] After the MME 30 determines the type of the target PDN connection activated by the UE 10 in the 4G network, it sends a session creation request to the PDN gateway corresponding to the target PDN connection. The session creation request carries the connection type of the target PDN.

[0043] For example, after UE 10 selects an independent PGW, MME 30 sends a session creation request to the independent PGW with the 5GSIWKI flag set to 0 to indicate to the independent PGW that the target PDN connection does not support interoperability between 4G and 5G networks. After receiving this flag set to 0, the independent PGW will not allocate 5G quality of service (QoS) parameters corresponding to the target PDN connection.

[0044] After UE 10 selects the converged PGW / SMF, MME 30 sends a session creation request to the converged PGW / SMF with the 5GSIWKI flag set to 1, indicating to the converged PGW / SMF that the target PDN connection does not support interoperability between 4G and 5G networks. Upon receiving this flag set to 0, the converged PGW / SMF allocates the 5GQOS parameters corresponding to the target PDN connection to facilitate subsequent handover of UE 10 from the 4G network to the 5G network.

[0045] In step 106, depending on different situations, in response to the context acquisition request of the AMF 20, the target context sent to the AMF 20 may be one or more of the mobility management state context and the session management context. For example, the target context sent to the AMF 20 includes both the mobility management state context and the session management context, or only the mobility management state context. Accordingly, the AMF 20 sends a response message to the MME 30 based on the received target context, and the response message carries a gateway change indication corresponding to the target PDN connection.

[0046] Correspondingly, in step 108, after receiving the response message of the AMF 20 to the target context, the MME 30 deletes the target PDN connection. Depending on different situations, the target PDN connection to be deleted is also different.

[0047] The above steps 106 and 108 will be described below in combination with different embodiments.

[0048] Different situations include that the connection type of the target PDN is determined by the MME 30 end, or that the connection type of the target PDN is sent by the MME 30 to the AMF 20 end for determination.

[0049] Case 1:

[0050] Optionally, sending the mobility management state context and the target context in the session management context to the AMF includes: determining the connection type of the target PDN carried in the session management context; when the PDN connection type is the first connection type, sending the mobility management state context and the session management context to the AMF in response to the context acquisition request.

[0051] The target PDN connection is deleted, comprising: based on the first connection type of the target PDN and the gateway change indication, deleting the target PDN connection on the target gateway.

[0052] In this embodiment, the connection type of the target PDN is determined by the MME 30, and the connection type of the target PDN is the first connection type, that is, the 5GSIWKI flag is set to 1, and the target PDN supports interoperability between 4G network and 5G network.

[0053] When the 5GSIWKI flag carried in the identification session management context is set to 1, MME 30 sends the mobility management state context of the 4G network of UE 10 and the session management context of the target PDN to AMF 20 at the same time, thereby sending the PDN connection to AMF 20. After receiving the mobility management state context and session management context, AMF 20 responds with a response message to MME 30.

[0054] Correspondingly, after MME 30 receives the response message returned by AMF 20, it deletes the target PDN connection on the target gateway according to the gateway change indication carried in the response message, such as "SGWCI (SGW Change Indication): True".

[0055] Optionally, based on the first connection type of the target PDN and the gateway change indication, the target PDN connection on the target gateway is deleted, including: when the connection type of the target PDN is the first connection type, sending a deletion notification to the SGW gateway corresponding to the gateway change indication, wherein the SGW gateway is used to delete the locally stored connection information of the target PDN according to the deletion notification.

[0056] That is to say, when the target PDN connection supports interoperability between 4G network and 5G network, MME30 will only initiate a session process to delete the target PDN connection corresponding to SGW40 to release the corresponding resources of the target PDN connection on the SGW gateway.

[0057] Case 2:

[0058] Optionally, sending the mobility management state context and the target context in the session management context to the AMF includes: determining the connection type of the target PDN carried in the session management context; when the PDN connection type is the second connection type, sending the mobility management state context to the AMF in response to the context acquisition request.

[0059] The target PDN connection is deleted, comprising: based on the second connection type of the target PDN and the gateway change indication, deleting the target PDN connection on the target gateway.

[0060] In this embodiment, the connection type of the target PDN is determined by the MME 30, and the connection type of the target PDN is the second connection type, that is, the 5GSIWKI flag is set to 0, and the target PDN does not support interoperability between the 4G network and the 5G network.

[0061] When the 5GSIWKI identifier carried in the identification session management context is set to 0, MME 30 only sends the mobility management state context of the 4G network of UE 10 to AMF20, but does not send the session management context of the target PDN, thereby not sending the PDN connection to AMF 20.

[0062] When the 5GSIWKI flag carried in the identification session management context is set to 1, MME 30 sends the mobility management state context of the 4G network of UE 10 and the session management context of the target PDN to AMF 20 at the same time, thereby sending the PDN connection to AMF 20. After receiving the mobility management state context, AMF 20 responds with a response message to MME 30.

[0063] Correspondingly, after MME 30 receives the response message returned by AMF 20, it deletes the target PDN connection on the target gateway according to the gateway change indication carried in the response message, such as "SGWCI (SGW Change Indication): True".

[0064] Optionally, based on the second connection type of the target PDN and the gateway change indication, the target PDN connection on the target gateway is deleted, including: when the connection type of the target PDN is the second connection type, sending a deletion notification to the SGW gateway and PGW gateway corresponding to the gateway change indication, respectively, wherein the SGW gateway is used to delete the locally stored target PDN connection according to the deletion notification, and the PGW gateway is used to delete the locally stored target PDN connection according to the deletion notification.

[0065] That is to say, when the target PDN connection does not support interoperability between 4G network and 5G network, MME30 will simultaneously initiate the session process of deleting the target PDN connection to SGW 40 and PGW 50 to release the corresponding resources of the target PDN connection on the SGW gateway and independent PGW.

[0066] Therefore, since independent PGW does not support interoperability between 4G network and 5G network, the PDN connections activated on the independent PGW cannot be migrated to the 5G network, resulting in the problem that these PDN connections may not be released for a long time. This application can delete the PDN connections on these activated independent PGWs, thereby releasing the resources on the corresponding interfaces on the independent PGW.

[0067] Case 3:

[0068] Optionally, sending the mobility management state context and the target context in the session management context to the AMF includes: sending the mobility management state context and the session management context to the AMF in response to the context acquisition request; deleting the target PDN connection includes: deleting the target PDN connection on the target gateway based on the connection type of the target PDN and the gateway change indication. Deleting the target PDN connection includes: deleting the target PDN connection on the target gateway based on the second connection type of the target PDN and the gateway change indication.

[0069] In this embodiment, the connection type of the target PDN is determined by the AMF 20 side. After receiving the context acquisition request sent by the AMF 20, the MME 30 side sends the acquired mobility management state context of the 4G network of the UE 10 and the session management context of the target PDN to the AMF 20 at the same time. After receiving the mobility management state context and the session management context, the AMF 20 responds with a response message to the MME 30 regardless of whether the connection type of the target PDN is the first connection type or the second connection type.

[0070] Correspondingly, after MME 30 receives the response message returned by AMF 20, it deletes the target PDN connection on the target gateway according to the gateway change indication carried in the response message, such as "SGWCI (SGW Change Indication): True".

[0071] Optionally, based on the first connection type of the target PDN and the gateway change indication, the target PDN connection on the target gateway is deleted, including: when the connection type of the target PDN is the first connection type, sending a deletion notification to the SGW gateway corresponding to the gateway change indication, wherein the SGW gateway is used to delete the locally stored connection information of the target PDN according to the deletion notification.

[0072] That is to say, after MME 30 receives the response message returned by AMF 20, it queries the session management context of the target PDN connection corresponding to the gateway change indication, and determines the connection type of the target PDN connection saved in the session management context.

[0073] When the 5GSIWKI identifier carried in the identification session management context is set to 1, that is, when it is determined that the target PDN connection supports interoperability between 4G network and 5G network, MME 30 will only initiate a session process to delete the target PDN connection corresponding to SGW40 to release the corresponding resources of the target PDN connection on the SGW gateway.

[0074] Case 4:

[0075] Optionally, sending the mobility management state context and the target context in the session management context to the AMF includes: sending the mobility management state context and the session management context to the AMF in response to the context acquisition request; deleting the target PDN connection, including: deleting the target PDN connection on the target gateway based on the first connection type of the target PDN and the gateway change indication.

[0076] In this embodiment, the connection type of the target PDN is determined by the AMF 20 side. After receiving the context acquisition request sent by the AMF 20, the MME 30 side sends the acquired mobility management state context of the 4G network of the UE 10 and the session management context of the target PDN to the AMF 20 at the same time. After receiving the mobility management state context and the session management context, the AMF 20 responds with a response message to the MME 30 regardless of whether the connection type of the target PDN is the first connection type or the second connection type.

[0077] Correspondingly, after MME 30 receives the response message returned by AMF 20, it deletes the target PDN connection on the target gateway according to the gateway change indication carried in the response message, such as "SGWCI (SGW Change Indication): True".

[0078] Optionally, based on the second connection type of the target PDN and the gateway change indication, the target PDN connection on the target gateway is deleted, including: when the connection type of the target PDN is the second connection type, sending a deletion notification to the SGW gateway and PGW gateway corresponding to the gateway change indication, respectively, wherein the SGW gateway is used to delete the locally stored target PDN connection according to the deletion notification, and the PGW gateway is used to delete the locally stored target PDN connection according to the deletion notification.

[0079] That is to say, after MME 30 receives the response message returned by AMF 20, it queries the session management context of the target PDN connection corresponding to the gateway change indication, and determines the connection type of the target PDN connection saved in the session management context.

[0080] When the 5GSIWKI identifier carried in the identification session management context is set to 0, that is, when it is determined that the target PDN connection does not support interoperability between the 4G network and the 5G network, MME 30 will simultaneously initiate a session process to delete the target PDN connection to SGW40 and PGW 50 to release the corresponding resources of the target PDN connection on the SGW gateway and the independent PGW.

[0081] Since independent PGW does not support interoperability between 4G and 5G networks, the PDN connections activated on the independent PGW cannot be migrated to the 5G network, resulting in the problem that these PDN connections may not be released for a long time. This application can delete the PDN connections on these activated independent PGWs, thereby releasing the resources on the corresponding interfaces on the independent PGW.

[0082] In an embodiment of the present application, by receiving a context acquisition request sent by an access and mobility management function AMF, the mobility management state context of the UE's 4G network and the session management context of the target PDN are obtained, wherein the session management context carries the connection type of the target PDN, and the connection type includes a first connection type that supports interoperability between 4G networks and 5G networks and a second connection type that does not support interoperability between 4G networks and 5G networks; in response to the context acquisition request, the mobility management state context and the target context in the session management context are sent to the AMF; after receiving a response message from the AMF to the target context, the target PDN connection is deleted. Thus, by marking the PDN connection that supports interoperability between 4G and 5G through the MME, the identification of the target PDN connection type can be simply and effectively achieved without changing the existing network architecture, so that the selected PDN connection that does not support interoperability between 4G and 5G can be deleted from the corresponding PGW to release the interface sessions on the PGW side and avoid unnecessary network resource consumption.

[0083] In another embodiment of the present application, a PDN connection deletion method for interoperability between a 4G network and a 5G network is also provided, which is applied to the access and mobility management function AMF.

[0084] like Figure 3 As shown, the method includes the following steps:

[0085] Step 202: upon receiving a 5G network registration request initiated by the target UE, a context acquisition request is sent to the MME, where the context acquisition request carries the identifier of the target UE and the 5G network type identifier;

[0086] Step 204: Receive the mobility management state context of the 4G network of the UE and the session management context of the target PDN sent by the MME in response to the context acquisition request, wherein the session management context carries the connection type of the target PDN, and the connection type includes a first connection type that supports interoperability between the 4G network and the 5G network and a second connection type that does not support interoperability between the 4G network and the 5G network;

[0087] Step 206: After receiving the mobility management state context and the session management context, a response message carrying a gateway change indication corresponding to the target PDN connection is sent to the MME, wherein the MME is configured to delete the target PDN connection after receiving the response message.

[0088] In the above embodiment, the connection type of the target PDN is determined on the AMF side. After receiving the mobility management state context of the UE's 4G network and the session management context of the target PDN sent by the MME, the AMF will respond to the message to the MME regardless of whether the connection type of the determined target PDN is the first connection type or the second connection type.

[0089] Moreover, when it is determined that the connection type of the target PDN is the first connection type, that is, when the target PDN connection selects the converged PGW / SMF gateway, the AMF initiates the 5G process according to the converged PGW / SMF selected by the target PDN connection in the session management context, thereby enabling the UE to switch from the 4G network to the 5G network. When it is determined that the connection type of the target PDN is the second connection type, that is, when the target PDN connection selects the independent PGW gateway, the AMF stops triggering the process of switching from the 4G network to the 5G network.

[0090] In an embodiment of the present application, upon receiving a 5G network registration request initiated by the target UE, a context acquisition request is sent to the MME; the mobility management state context of the UE's 4G network and the session management context of the target PDN are received by the MME in response to the context acquisition request, wherein the session management context carries the connection type of the target PDN, and the connection type includes a first connection type that supports interoperability between the 4G network and the 5G network and a second connection type that does not support interoperability between the 4G network and the 5G network; after receiving the mobility management state context and the session management context, a response message carrying a gateway change indication corresponding to the target PDN connection is sent to the MME, wherein the MME is used to delete the target PDN connection after receiving the response message. Thus, the PDN connection that supports 4G and 5G interoperability marked in the session management context can be used to simply and effectively identify the target PDN connection type without changing the existing network architecture. Therefore, for PDN connections that do not support 4G and 5G interoperability, the AMF directly stops triggering the switching process from the 4G network to the 5G network, thereby avoiding unnecessary network resource consumption and improving the work efficiency of the AMF.

[0091] Optionally, an embodiment of the present application further provides an electronic device, Figure 4 It is a structural block diagram of an electronic device according to an embodiment of the present application.

[0092] like Figure 4As shown, the electronic device 2000 includes a memory 2200 and a processor 2400 electrically connected to the memory 2200, and the memory 2200 stores a computer program that can be run on the processor 2400. When the computer program is executed by the processor, the various processes of the above-mentioned PDN connection deletion method embodiment for interoperability between the 4G network and the 5G network are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0093] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the computer program implements the various processes of any of the above-mentioned embodiments of the method for deleting a PDN connection for interoperability between a 4G network and a 5G network, and can achieve the same technical effect. To avoid repetition, the details are not repeated here. The computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0094] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0095] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0096] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A method for deleting a PDN connection for interoperability between a 4G network and a 5G network, characterized in that: Applied to a mobility management entity (MME), the method includes: Receive a context acquisition request sent by the access and mobility management function AMF, where the context acquisition request carries the UE identifier requesting registration on the 5G network and the 5G network type identifier; Obtain, according to the UE identifier and the 5G network type identifier, a mobility management state context of the 4G network of the UE and a session management context of the target PDN, wherein the session management context carries a connection type of the target PDN, and the connection type includes a first connection type that supports interoperability between the 4G network and the 5G network and a second connection type that does not support interoperability between the 4G network and the 5G network; In response to the context acquisition request, send the mobility management state context and the target context in the session management context to the AMF, where the target context includes both the mobility management state context and the session management context, or only includes the mobility management state context; After receiving a response message from the AMF to the target context, the target PDN connection is deleted, wherein the response message carries a gateway change indication corresponding to the target PDN connection.

2. The method according to claim 1, wherein Sending the mobility management state context and the target context in the session management context to the AMF includes: Determining a connection type of the target PDN carried in the session management context; When the PDN connection type is the first connection type, sending the mobility management state context and the session management context to the AMF in response to the context acquisition request; The deleting the target PDN connection includes: deleting the target PDN connection on the target gateway based on the first connection type of the target PDN and the gateway change indication.

3. The method according to claim 1, wherein Sending the mobility management state context and the target context in the session management context to the AMF includes: Determining a connection type of the target PDN carried in the session management context; When the PDN connection type is the second connection type, sending the mobility management state context to the AMF in response to the context acquisition request; The deleting the target PDN connection includes: deleting the target PDN connection on the target gateway based on the second connection type of the target PDN and the gateway change indication.

4. The method according to claim 1, wherein Sending the mobility management state context and the target context in the session management context to the AMF includes: Sending the mobility management state context and the session management context to the AMF in response to the context acquisition request; The deleting the target PDN connection includes: deleting the target PDN connection on the target gateway based on the first connection type of the target PDN and the gateway change indication.

5. The method according to claim 1, wherein Sending the mobility management state context and the target context in the session management context to the AMF includes: Sending the mobility management state context and the session management context to the AMF in response to the context acquisition request; The deleting the target PDN connection includes: deleting the target PDN connection on the target gateway based on the second connection type of the target PDN and the gateway change indication.

6. The method according to claim 2 or 4, wherein: Deleting the target PDN connection on the target gateway based on the first connection type of the target PDN and the gateway change indication, including: When the connection type of the target PDN is the first connection type, a deletion notification is sent to the SGW gateway corresponding to the gateway change indication, wherein the SGW gateway is configured to delete the locally stored connection information of the target PDN according to the deletion notification.

7. The method according to claim 3 or 5, wherein: Deleting the target PDN connection on the target gateway based on the second connection type of the target PDN and the gateway change indication, including: When the connection type of the target PDN is the second connection type, a deletion notification is sent to the SGW gateway and PGW gateway corresponding to the gateway change indication respectively, wherein the SGW gateway is used to delete the locally stored target PDN connection according to the deletion notification, and the PGW gateway is used to delete the locally stored target PDN connection according to the deletion notification.

8. The method according to claim 1, wherein Before acquiring the mobility management state context of the 4G network of the UE and the session management context of the target PDN, the method further includes: Determine the connection type of the target PDN according to the type of the target PDN gateway selected corresponding to the target PDN connection when the UE activates the PDN connection in the 4G network, where the type of the target PDN gateway includes a converged PGW / SMF gateway and an independent PGW gateway; Sending a session creation request to the target PDN gateway, where the session creation request carries the connection type of the target PDN; Receive a response message sent by the target PDN in response to the session generation request, wherein, when the connection type of the target PDN is the first connection type, the response message carries a 5G service quality parameter corresponding to the target PDN connection.

9. A method for deleting a PDN connection for interoperability between a 4G network and a 5G network, characterized in that: Applied to an access and mobility management function (AMF), the method comprises: Upon receiving a 5G network registration request initiated by the target UE, sending a context acquisition request to the MME, where the context acquisition request carries the identifier of the target UE and the 5G network type identifier; Receiving the mobility management state context of the 4G network of the UE and the session management context of the target PDN sent by the MME in response to the context acquisition request, wherein the session management context carries the connection type of the target PDN, and the connection type includes a first connection type that supports interoperability between the 4G network and the 5G network and a second connection type that does not support interoperability between the 4G network and the 5G network; After receiving the mobility management state context and the session management context, a response message carrying a gateway change indication corresponding to the target PDN connection is sent to the MME, wherein the MME is configured to delete the target PDN connection after receiving the response message.

10. An electronic device, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the method according to any one of claims 1 to 8 or the steps of the method according to claim 9.

Images