WO2018054157A1

WO2018054157A1 - Method, apparatus and system for releasing session resource

Info

Publication number: WO2018054157A1
Application number: PCT/CN2017/093902
Authority: WO
Inventors: 何光伟
Original assignee: 华为技术有限公司
Priority date: 2016-09-26
Filing date: 2017-07-21
Publication date: 2018-03-29
Also published as: CN107872326B; CN107872326A

Abstract

The present invention belongs to the technical field of the Internet, and disclosed thereby are a method, apparatus and system for releasing a session resource. The method is applied to a packet data network (PDN) gateway control plane (PGW-C) device, and comprises: determining that a PDN gateway user plane (PGW-U) device that establishes a local connection restarts; sending to a charging server a resource release request corresponding to the PGW-U device, the resource release request carrying an identifier of the PGW-U device, and the identifier of the PGW-U device being used for the charging server releasing a session resource corresponding to the PGW-U device without requiring a PGW-C to send a resource release request for each user equipment (UE) on the PGW-U one by one, thereby increasing efficiency of releasing session resources.

Description

Method, device and system for releasing session resources

This application claims priority to Chinese Patent Application No. 201610851484.X, filed on September 26, 2016, entitled "A Method, Apparatus, and System for Dissipating Session Resources", the entire contents of which are hereby incorporated by reference. The citations are incorporated herein by reference.

Technical field

The present invention relates to the field of Internet technologies, and in particular, to a method, apparatus, and system for releasing session resources.

Background technique

With the development of Internet technology, the application of the Internet has become more and more widespread, and the number of users of the Internet has also increased. When a user accesses a certain network service through a user equipment (UE), the UE establishes a network connection with the service server of the network service, and at the same time, the network element in the network saves the session corresponding to the UE, and the Internet access of the UE The charging information such as the duration and the data traffic is sent to the charging server, and the charging server allocates session resources, such as processing resources and memory resources, to the UE to perform charging for the UE. The C (Control, Control) plane and the U (User) plane of the PGW are separated. In the scenario where the CU is separated, the network element in the network may include the PGW-C (PDN Gateway Control Plane, PDN). The gateway control plane) and the PGW-U (PDN Gateway User Plane), the accounting server may be an AAA (Authentication, Authorization and Accounting, Authentication, Authorization, and Accounting) server, and the PGW-C and the PGW-U, respectively. The AAA server performs signaling interaction.

In practice, the PGW-U may fail to restart. After the PGW-U is restarted, the UE corresponding to the PGW-U goes offline, and the AAA server needs to release the corresponding session resources. Specifically, after the PGW-U fails to be restarted, a restart notification is sent to the PGW-C, and then the PGW-C initiates a resource release procedure corresponding to the PGW-U, that is, the PGW-C is based on each UE corresponding to the PGW-U. The session sends a resource release request (such as an Accounting-Request STOP message) to the AAA server one by one. The resource release request may carry the identifier of the session, so that the AAA server releases the resources of the session.

In the process of implementing the present invention, the inventors have found that the prior art has at least the following problems:

For multiple sessions on the restarted PGW-U, the PGW-C needs to send a resource release request to the AAA server one by one, which results in a lower efficiency of releasing session resources.

Summary of the invention

In order to solve the problems in the prior art, embodiments of the present invention provide a method, apparatus, and system for releasing session resources. The technical solution is as follows:

In the AAA charging scenario in the CU separate network architecture, the system may include an accounting server, at least one PGW-C device, and at least one PGW-U device, and the system may further include a UE and other network elements. The PGW-C can establish a connection between the billing server and the PGW-U device, respectively.

In a first aspect, a method for releasing a session resource is provided, the method being applicable to a PGW-C device, the method comprising:

The PGW-C device determines that the PDN gateway user plane PGW-U device that establishes the connection with the local device restarts to the accounting server. Sending a resource release request corresponding to the PGW-U device, where the resource release request carries an identifier of the PGW-U device, and the identifier of the PGW-U device is used by the charging server to release the PGW-U The session resource corresponding to the device.

In the solution shown in the embodiment of the present invention, after the PGW-U is restarted, the PGW-C sends a resource release request corresponding to the PGW-U to the accounting server, so that the charging server releases all the identifiers corresponding to the PGW-U. The session resource does not require the PGW-C to send a resource release request one by one for each UE on the PGW-U, thereby improving the efficiency of releasing the session resources.

In a first possible implementation manner of the first aspect, the resource release request further carries an identifier of the PGW-C device.

In this way, the charging server can release the session resources corresponding to the PGW-U device and the PGW-C device.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in the second possible implementation manner of the first aspect, the determining that the PDN gateway user plane PGW-U device that establishes the connection with the local device is restarted, specifically includes: :

Sending a detection message to each PGW-U device that establishes a connection with the local, the PGW-U device that has not received the feedback message within the preset duration is determined to be the restarted PGW-U device; or, the connection with the local connection is received. A restart notification sent by the PGW-U device determines that the PGW-U device restarts.

In this way, the PGW-C can determine whether the PGW-U device restarts, so as to notify the charging server to release the session resources in time.

With reference to the first aspect to the second possible implementation of the first aspect, in a third possible implementation manner of the first aspect, before the determining that the PDN gateway user plane PGW-U device that establishes the connection with the local device is restarted, The method further includes:

Sending, to the charging server, a charging request corresponding to the user equipment UE, where the charging request carries an identifier of the PGW-U device and a session identifier of the UE.

In this way, the charging server may establish a correspondence between the identifier of the PGW-U device and the session resource of the UE, so as to release the session resource corresponding to the PGW-U device.

A second aspect provides a method for releasing a session resource, where the method is applied to an accounting server, and the method includes:

The charging server receives the resource release request sent by the PDN gateway control plane PGW-C device, where the resource release request carries the identifier of the PDN gateway user plane PGW-U device, according to the identifier of the pre-stored PGW-U device The session resource corresponding to the identifier of the PGW-U device is determined, and the determined session resource is released.

In the solution shown in the embodiment of the present invention, after the PGW-U is restarted, the PGW-C sends a resource release request corresponding to the PGW-U to the accounting server. After receiving the resource release request, the accounting server may release the resource release request. For all the session resources corresponding to the identifier of the PGW-U, the PGW-C does not need to send a resource release request one by one for each UE on the PGW-U, thereby improving the efficiency of releasing the session resources.

In a first possible implementation manner of the second aspect, the resource release request further carries an identifier of the PGW-C device;

Determining, according to the corresponding relationship between the identifier of the PGW-U device and the session resource, the session resource corresponding to the identifier of the PGW-U device, specifically:

Corresponding relationship between the identifier of the PGW-U device, the identifier of the PGW-C device, and the session resource, and the identifier of the PGW-C device and the identifier of the PGW-U device in the resource release request, Determine the corresponding session resource.

With reference to the second aspect, or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, before the receiving the resource release request sent by the PGW-C device, the method further includes:

Receiving a charging request sent by the PGW-C device, where the charging request carries an identifier of the PGW-U device and a session identifier of the user equipment UE, where the PGW-U device is a PGW corresponding to the UE U device;

And allocating a session resource to the UE, and establishing a correspondence between the identifier of the PGW-U device and the session resource of the UE.

With reference to the second aspect, the second possible implementation manner of the second aspect, in the third possible implementation manner of the second aspect, the resource release request further carries the restart times of the PGW-U device;

Before the determining the session resource corresponding to the identifier of the PGW-U device, the method further includes:

Determining whether the number of restarts of the PGW-U device is the same as the number of restarts of the PGW-U device whose receiving time is closest to the current time. If not, performing the determining the session corresponding to the identifier of the PGW-U device The steps of the resource.

In this way, it can be determined whether the session resource corresponding to the PGW-U device has been released. If it has been released, the processing may be omitted to avoid repeated release, thereby saving the processing resources of the charging processor.

In a third aspect, a PGW-C device is provided, the PGW-C device comprising:

a determining unit, configured to determine that a PDN gateway user plane PGW-U device that establishes a connection with the local device restarts;

a sending unit, configured to send, to the charging server, a resource release request corresponding to the PGW-U device, where the resource release request carries an identifier of the PGW-U device, and the identifier of the PGW-U device is used by the The accounting server releases the session resources corresponding to the PGW-U device.

In a first possible implementation manner of the third aspect, the resource release request further includes an identifier of the PGW-C device, where the identifier of the PGW-C device is used by the charging server to release the PGW a U-device and a session resource corresponding to the PGW-C device.

With reference to the third aspect, or the first possible implementation manner of the third aspect, in the second possible implementation manner of the third aspect, the determining unit is specifically configured to:

Sending a detection message to each PGW-U device that establishes a connection with the local, and the PGW-U device that has not received the feedback message within the preset duration is determined to be the restarted PGW-U device; or

Receiving a restart notification sent by the PGW-U device that establishes a connection with the local, determining that the PGW-U device restarts.

In conjunction with the second possible implementation of the third aspect to the third aspect, in a third possible implementation manner of the third aspect, the sending unit is further configured to:

Sending, to the charging server, a charging request corresponding to the user equipment UE, where the charging request carries an identifier of the PGW-U device and a session identifier of the UE, so that the charging server establishes the PGW a correspondence between the identifier of the U device and the session resource of the UE.

In a fourth aspect, a billing server is provided, where the billing server includes:

a receiving unit, configured to receive a resource release request sent by a PDN gateway control plane PGW-C device, where the resource is released The request carries the identifier of the PDN gateway user plane PGW-U device;

a determining unit, configured to determine, according to a correspondence between the identifier of the PGW-U device and the session resource, the session resource corresponding to the identifier of the PGW-U device;

a release unit for releasing the determined session resources.

In a first possible implementation manner of the fourth aspect, the resource release request further carries an identifier of the PGW-C device;

The determining unit is specifically configured to:

With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, in the second possible implementation manner of the fourth aspect, the receiving unit is further configured to:

The billing server further includes an establishing unit, configured to:

With reference to the second possible implementation of the fourth aspect to the fourth aspect, in a third possible implementation manner of the fourth aspect, the resource release request further carries a restart number of the PGW-U device;

The determining unit is further configured to:

In a fifth aspect, a PDN gateway control plane PGW-C device is provided, the PGW-C device comprising a processor and a transceiver, wherein:

The processor is configured to determine that a PDN gateway user plane PGW-U device that establishes a connection with the local device restarts;

The transceiver is configured to send a resource release request corresponding to the PGW-U device to the charging server, where the resource release request carries an identifier of the PGW-U device, and the identifier of the PGW-U device is used by And releasing, by the charging server, a session resource corresponding to the PGW-U device.

In a first possible implementation manner of the fifth aspect, the resource release request further includes an identifier of the PGW-C device, where the identifier of the PGW-C device is used by the charging server to release the PGW a U-device and a session resource corresponding to the PGW-C device.

With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the processor is specifically configured to:

In conjunction with the second possible implementation of the fifth aspect to the fifth aspect, the third possible implementation manner of the fifth aspect The transceiver is further configured to:

In a sixth aspect, a billing server is provided, the billing server comprising a processor, a transceiver, and a memory, wherein:

The transceiver is configured to receive a resource release request sent by a PDN gateway control plane PGW-C device, where the resource release request carries an identifier of the PDN gateway user plane PGW-U device;

The processor is configured to determine, according to the correspondence between the identifier of the PGW-U device and the session resource, the session resource corresponding to the identifier of the PGW-U device;

The processor is further configured to release the determined session resource.

In a first possible implementation manner of the sixth aspect, the resource release request further carries an identifier of the PGW-C device;

The processor is specifically configured to:

Corresponding relationship between the identifier of the PGW-U device, the identifier of the PGW-C device, and the session resource, and the identifier of the PGW-C device in the resource release request and the PGW-U device according to the identifier of the PGW-U device pre-stored by the memory The identity of the corresponding session resource.

With reference to the sixth aspect, or the first possible implementation manner of the sixth aspect, in the second possible implementation manner of the sixth aspect, the transceiver is further configured to:

The processor is further configured to allocate a session resource to the UE, and establish a correspondence between an identifier of the PGW-U device and a session resource of the UE.

With reference to the second possible implementation manner of the sixth aspect to the sixth aspect, in a third possible implementation manner of the sixth aspect, the resource release request further includes a restart number of the PGW-U device;

The processor is further configured to:

In a seventh aspect, a system for releasing session resources is provided, the system comprising a PDN gateway control plane PGW-C device and a charging server, wherein:

The PGW-C device is configured to determine that a PDN gateway user plane PGW-U device that establishes a connection with the local device is restarted, and sends a resource release request corresponding to the PGW-U device to the accounting server, where the resource release request is carried. An identifier of the PGW-U device, where the identifier of the PGW-U device is used by the charging server to release a session resource corresponding to the PGW-U device;

The charging server is configured to receive a resource release request sent by the PDN gateway control plane PGW-C device, and determine, according to the correspondence between the identifier of the PGW-U device and the session resource, the identifier of the PGW-U device Meeting The resources are released, and the determined session resources are released.

The beneficial effects brought by the technical solutions provided by the embodiments of the present invention are:

In the embodiment of the present invention, after the PGW-U is restarted, the PGW-C sends a resource release request corresponding to the PGW-U to the accounting server, so that the charging server releases all the session resources corresponding to the identifier of the PGW-U. It is not necessary for the PGW-C to send a resource release request one by one for each UE on the PGW-U, so that the efficiency of releasing the session resources can be improved.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a system frame diagram provided by an embodiment of the present invention;

2 is a flowchart of a method for releasing session resources according to an embodiment of the present invention;

FIG. 3 is a flowchart of a method for releasing session resources according to an embodiment of the present invention;

4 is a schematic structural diagram of a network device according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a PGW-C device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a charging server according to an embodiment of the present invention.

detailed description

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

The embodiment of the invention discloses a method for releasing the session resources of the UE in the AAA charging scenario under the CU separate network architecture. In the scenario where the CU is separated, the C (Control) plane and the U (User) plane of the PGW device are separated, that is, the PGW device can be divided into a PGW-C device (PDN Gateway Control Plane, PDN Gateway Control Plane). And a PGW-U device (PDN Gateway User Plane), as shown in FIG. 1 , is a system framework diagram of an embodiment of the present invention, where the system may include a UE, an accounting server, and at least one PGW-C device. At least one PGW-U device and other network elements.

Wherein, one PGW-C device can establish a connection with multiple PGW-U devices. Similarly, one PGW-U device can also establish a connection with multiple PGW-C devices; the other network elements can be PGW-C devices and PGWs. - NEs other than the U device, such as SGW-U (Serving Gateway User Plane), SGW-C (Serving Gateway Control Plane), and MME (Mobility Management Entity) Wait.

When the user accesses a network service through the UE, the UE requests to go online, and the PGW-C device can receive the online notification of the UE, and then select the corresponding PGW-U device for the UE. After the UE is online, the service server of the network service can be accessed, and then the PGW-U device can collect charging information such as the Internet access time and data traffic of the UE, and can send the charging information of the UE to the PGW-C device. The PGW-C device sends the charging information of the UE to the charging server, so that the charging server performs charging for the UE.

In the foregoing process, the accounting server and each network element in the network may save the session corresponding to the UE, and serve as the UE. Allocate session resources, such as processing resources and memory resources. The embodiment of the present invention is mainly concerned with the process of releasing the session resources corresponding to the PGW-U device after the PGW-U device fails and restarts.

FIG. 2 is a flowchart of a method for releasing session resources according to an exemplary embodiment of the present invention. The method may be used in a network system as shown in FIG. 1. As shown in FIG. 2, the method for releasing session resources may include:

Step 201: The PGW-C device determines that the PDN gateway user plane PGW-U device that establishes the connection with the local device restarts.

In an implementation, the PGW-C device can establish a connection with at least one PGW-U device, and then the PGW-C device can detect in real time at least one PGW-U device whether there is a restarted PGW-U device. The manner in which the PGW-C device detects whether the PGW-U device is restarted may be various. This embodiment provides two feasible processing modes, as follows:

In the first mode, the PGW-C device sends a detection message to each PGW-U device that establishes a connection with the local device, and the PGW-U device that does not receive the feedback message within the preset duration is determined to be the restarted PGW-U device.

In the implementation, the transmission period of the detection message may be preset in the PGW-C device. When the preset transmission period is reached, the PGW-C device separately sends a detection message to the PGW-U device that establishes a connection with the local, and the detection message may be a heartbeat detection message. After receiving the detection message, the normal working PGW-U device can send a feedback message to the PGW-C device, and the PGW-C device will not receive the feedback message if the link fails or the PGW-U device itself fails. Based on this, the PGW-C device can determine the PGW-U device in which the restart occurs, wherein the self failure can be a restart or an internal abnormality or the like.

After the PGW-C device sends a detection message, it can perform timing, and can determine the PGW-U device that does not send the feedback message within the preset duration (which can be referred to as the first preset duration), and the PGW-U device is taken as Faulty PGW-U device. Alternatively, the PGW-C device may continuously send multiple detection messages within a preset duration (which may be referred to as a second preset duration), and the PGW-C device may receive multiple feedbacks sent by the normally working PGW-U device. The PGW-C device may determine the PGW-U device that has not sent the feedback message after transmitting the multiple detection messages, and use the PGW-U device as the failed PGW-U device. For example, after the PGW-C device can send 3 detection messages, the PGW-C device receives 3 feedback messages sent by the PGW-U device 1, and the PGW-U device 2 sends 2 feedback messages, but does not receive the PGW. The feedback message sent by the U device 3 can determine that the PGW-U device 3 has failed. The first preset duration and the second preset duration may be the same or different, and are not limited in this embodiment.

In the second mode, the PGW-C device receives a restart notification sent by the PGW-U device that establishes a connection with the local device, and determines that the PGW-U device restarts.

In an implementation, the PGW-U device may send a restart notification to the PGW-C device after the restart, and the restart notification may be any signaling message carrying the restart identifier. The restart identifier may be an identifier for indicating that the PGW-U device is restarted, such as an identifier of a restart action, a restart number of the PGW-U device, and the like. The PGW-C device can determine whether the PGW-U device restarts based on the restart identifier.

In the case of restarting the identifier that is identified as the restart action, after the PGW-U device is restarted, the restart identifier may be added to the PGW-C device signaling message, and the PGW-C device receives the signaling message sent by the PGW-U device. The information message may be parsed. If the information message carries a restart identifier, it may be determined that the PGW-U device restarts.

In the case of restarting the number of restarts of the PGW-U device, the PGW-U device can record the number of restarts within the preset duration. After the PGW-U device restarts, the number of restarts can be increased by one. When the threshold is preset, the PGW-U device can clear its own restart count and then re-record. The PGW-U device can perform signaling interaction with the PGW-C device, and the interworking signaling can carry the current number of restarts of the PGW-U device. After receiving the number of restarts sent by the PGW-U device, the PGW-C device may compare the number of restarts with the number of restarts of the PGW-U device whose receiving time is closest to the current time. If the two are the same, the device may determine The PGW-U device does not restart, if both If it is not the same, it can be judged that the PGW-U device restarts.

Step 202: The PGW-C device sends a resource release request corresponding to the PGW-U device to the accounting server.

The resource release request may carry the resource release request carrying the identifier of the PGW-U device, where the identifier of the PGW-U device is used by the accounting server to release the session resource corresponding to the PGW-U device.

In an implementation, after determining that the PGW-U device restarts, the PGW-C device may send a resource release request corresponding to the PGW-U device to the accounting server. The resource release request may be an Accounting-Request OFF message, and the Accounting-Request OFF message may carry an identifier of the PGW-U device, such as a User Plane Identifier, and/or a User Plane IP Address. The User Plane Identifier can be the ID of the PGW-U device, and the User Plane IP Address can be the IP address of the PGW-U device. After receiving the resource release request sent by the PGW-C device, the accounting server may reply a response message, such as an Accounting-Response, to the PGW-C device.

In addition, as described above, the PGW-C device allocates session resources to the UE, and can store the correspondence between the UE and the PGW-U device. After the PGW-C device determines that the PGW-U device restarts, the UE corresponding to the PGW-U device may be determined. For each UE corresponding to the PGW-U device, the PGW-C device may determine the session resources allocated locally for the UE one by one, and send a resource release request to the NEs adjacent to the PGW-C device one by one for each UE. So that the network elements can release the session resources of the UEs, wherein the network element adjacent to the PGW-C device does not include the charging server. At the same time, the PGW-C device can also release the session resources allocated locally for these UEs one by one. For example, the processing resources and the storage resources corresponding to the UE may be released. For the specific processing, reference may be made to the prior art, and details are not described in this embodiment. It should be noted that the processing sequence of the process and the step 202 may be in no particular order.

Optionally, the PGW-C device may also carry the restart times of the PGW-U device in the resource release request, and the corresponding processing may be as follows: acquiring the restart times of the PGW-U device.

In an implementation, the PGW-C device can obtain the restart number of the PGW-U device, and can add the restart number to the resource release request, and then send the call to the charging server. The resource release request may be an Accounting-Request OFF message, and the Accounting-Request OFF message may carry the User Plane Recovery in addition to the identifier of the PGW-U device, and the User Plane Recovery is the number of restarts of the PGW-U device.

Optionally, the PGW-C device may further carry the identifier of the PGW-C device in the resource release request, where the identifier of the PGW-C device is used by the charging server to release the PGW-U device and the session resource corresponding to the PGW-C device. .

Step 203: The charging server receives the resource release request sent by the PGW-C device.

The resource release request may carry the identifier of the PGW-U device.

In an implementation, the accounting server may parse the received resource release request and obtain the identifier of the PGW-U device carried therein for subsequent processing.

Step 204: The charging server determines the session resource corresponding to the identifier of the PGW-U device according to the correspondence between the identifier of the PGW-U device and the session resource.

In an implementation, the corresponding relationship between the identifier of the PGW-U device and the session resource may be pre-stored in the accounting server, and the session resource may be all session resources corresponding to the PGW-U device. After receiving the resource release request, the accounting server may determine all the session resources corresponding to the identifier of the PGW-U device in the resource release request according to the correspondence between the identifier of the PGW-U device and the session resource, so as to release the session resources.

Optionally, the specific process for the charging server to establish the correspondence between the identifier of the PGW-U device and the session resource may include the following steps:

Step 1: The PGW-C device sends a charging request corresponding to the UE to the charging server.

The UE is the UE corresponding to the PGW-U device, and the charging request may carry the identifier of the PGW-U device and the session identifier of the UE, and the charging request may be an Accounting-Request START message and/or an Accounting-Request Interim- Update message.

In an implementation, after the UE goes online, the PGW-C device may receive an online notification of the UE, and then may select a corresponding PGW-U device for the UE. Thereafter, the PGW-C device may send a charging request corresponding to the UE to the charging server to notify the charging server to perform charging for the UE.

Step 2: The charging server receives the charging request sent by the PGW-C device.

In an implementation, after receiving the charging request, the accounting server may parse the charging request, and obtain the identifier of the PGW-U device and the session identifier of the UE.

Step 3: The accounting server allocates a session resource to the UE, and establishes a correspondence between the identifier of the PGW-U device and the session resource of the UE.

In an implementation, the charging server may allocate a session resource to the UE, and then add the identifier of the PGW-U device and the session resource of the UE to the corresponding relationship between the identifier of the PGW-U device and the session resource. Thereby, the correspondence between the identifier of the PGW-U device and the session resource of the UE is established.

Optionally, in the case that the resource release request further carries the number of restarts of the PGW-U device, the charging server may first determine, according to the number of restarts of the PGW-U device, whether resource release is required, and correspondingly, before step 204. The following process may also be performed: the charging server determines whether the number of restarts of the PGW-U device is the same as the number of restarts of the PGW-U device whose receiving time is closest to the current time, and if not, performs the pre-stored PGW- The step of determining the session resource corresponding to the identifier of the PGW-U device by the correspondence between the identifier of the U device and the session resource.

In an implementation, the charging server may receive the number of restarts of the PGW-U device sent by the PGW-C device, for example, the number of restarts of the PGW-U device that the PGW-C device may send to the charging server. Alternatively, the number of restarts of the PGW-U device may be carried in the Accounting-Request START, the Accounting-Request Interim-Update, and the Accounting-Request ON in the interaction signaling between the PGW-C device and the accounting server. After receiving the messages, the accounting server can obtain the number of restarts of the PGW-U device and then store it. After receiving the resource release request, the accounting server may parse the resource release request, obtain the identifier of the PGW-U device, and the number of restarts of the PGW-U device (for the convenience of description, the first restart number may be referred to as ). The charging server may obtain the number of restarts of the PGW-U device whose receiving time is closest to the current time (referred to as a second restart number for convenience of description).

The accounting server may determine whether the first restarting number is the same as the second restarting number. If the first restarting number is the same as the second restarting number, the step 204 may not be performed, and the session resource release may be successfully sent to the PGW-C device. Response message. If the number of the first restarts is different from the number of the second restarts, step 204 may be performed, when the charging server receives the resource release request corresponding to the PGW-U device sent by the other PGW-C device, and the resource release request is carried in the resource release request. When the number of restarts is the first number of restarts, the response message that the session resource is successfully released may be directly sent to other PGW-C devices.

Optionally, the charging server may also release the session resource corresponding to the PGW-U device and the PGW-C device. Correspondingly, the process of step 204 may be as follows: according to the identifier of the pre-stored PGW-U device, PGW- Corresponding relationship between the identifier of the C device and the session resource, and the identifier of the PGW-C device and the identifier of the PGW-U device in the resource release request, determine the corresponding session resource.

In the implementation, the PGW-C device sends the corresponding UE's charging request to the charging server, and may also carry the PGW-U setting. The identifier of the backup, the session identifier of the UE, and the identifier of the PGW-C device. After receiving the charging request, the accounting server may allocate the session resource to the UE, and then add the identifier of the PGW-U device, the identifier of the PGW-C device, and the session resource of the UE to the PGW-U. The correspondence between the identifier of the device, the identifier of the PGW-C device, and the session resource, thereby establishing an identifier of the PGW-U device, an identifier of the PGW-C device, and a correspondence relationship between the session resources of the UE.

After receiving the resource release request corresponding to the PGW-U device, the accounting server may be based on the identifier of the pre-stored PGW-U device, the correspondence between the identifier of the PGW-C device and the session resource, and the PGW in the resource release request. The identifier of the C device and the identifier of the PGW-U device determine the corresponding session resource, and the determined session resource is the session resource corresponding to the PGW-U device and the PGW-C device.

Step 205: The accounting server releases the determined session resource.

In an implementation, after the charging server determines the session resource corresponding to the identifier of the PGW-U device, the session resource allocated for the UE may be released one by one based on the session resource of each UE included in the session resource. For example, the processing resources and the storage resources corresponding to a certain UE may be released. For a specific process, refer to the prior art, and details are not described in this embodiment. For the case that the session resource is all the session resources corresponding to the identifier of the PGW-U device, the charging server determines that the identifier of the PGW-U device corresponds to all UEs according to the correspondence between the identifier of the PGW-U device and the session resource. After the session resource, the charging server may release the identifier of the PGW-U device corresponding to the session resources of all UEs. For the case where the session resource is the session resource corresponding to the PGW-U device and the PGW-C device, the charging server according to the identifier of the PGW-U device stored in advance, the identifier of the PGW-C device, and the correspondence relationship of the session resources, and The identifier of the PGW-C device in the resource release request and the identifier of the PGW-U device determine the corresponding session resource, and then release the determined session resource.

As shown in FIG. 3, an example of a method for releasing a session resource according to an embodiment of the present invention may be:

Step1: After the UE goes online, the PGW-C sends an Accounting-Request START message to the AAA Server.

The User Plane Identifier, and/or the User Plane IP Address, and/or the User Plane Identifier are the IDs of the PGW-U, and the User Plane IP Address is the IP address of the PGW-U. User Plane Recovery is the number of restarts of PGW-U.

Step2, AAA Server replies to Accounting-Response to PGW-C.

Step 3: The PGW-C sends an Accounting-Request Interim-Update message to the AAA Server.

The Accounting-Request Interim-Update message carries a User Plane Identifier, and/or a User Plane IP Address, and/or a User Plane Recovery.

Step4, AAA Server replies to Accounting-Response to PGW-C.

Step5, PGW-U restarts.

Step6, PGW-C detects the PGW-U restart.

Step 7, the PGW-C sends an Accounting-Request OFF message to the AAA Server.

The Accounting-Request OFF message carries the User Plane Identifier, and/or User Plane IP Address, and/or User Plane Recovery, to notify the AAA Server to release the PGW-U related session resources.

Step8, AAA Server replies to Accounting-Response.

Step 9: The AAA server releases the session resource corresponding to the PGW-U according to the Accounting-Request OFF message.

Step 10: After the PGW-C detects that the PGW-U restarts successfully, the PGW-C may send an Accounting-Request ON message to the AAA Server.

The Accounting-Request ON message carries the User Plane Identifier, and/or User Plane IP Address, and/or User Plane Recovery, to notify the AAA Server that the PGW-U resumes normal operation.

Step11, AAA Server replies to Accounting-Response.

In the embodiment of the present invention, after the PGW-U is restarted, the PGW-C sends a resource release request corresponding to the PGW-U to the accounting server, so that the charging server releases all the session resources corresponding to the identifier of the PGW-U, and does not need the PGW. -C sends a resource release request one by one for each UE on the PGW-U, so that the efficiency of releasing the session resources can be improved, and the signaling load between the PGW-C and the charging server can be reduced.

Please refer to FIG. 4, which is a schematic structural diagram of a network device according to an exemplary embodiment of the present invention. The network device 10 may be the PGW-C device or the charging server described above, and the network device 10 includes a processor 401, a transceiver 402, a memory 403, and a network interface 404. The memory 403 and the network interface 404 are respectively connected to the processor 401 and the transceiver 402; the memory 403 is used to store program code, the program code includes computer operation instructions, and the processor 401 and the transceiver 402 are used to execute the program stored in the memory 403. The code is used to implement related processing for releasing session resources, and the transceiver 402 can communicate with other UEs or network devices through the network interface 404.

Processor 401 includes one or more processing cores. The processor 401 executes various functional applications and data processing by running software programs and modules.

There may be multiple network interfaces 404 for communicating with other storage devices or network devices.

Optionally, the network device 10 further includes a component such as a bus 405. The memory 403 and the network interface 404 are respectively connected to the processor 402 via the bus 405.

Memory 403 can be used to store software programs as well as modules. Specifically, the memory 403 can store the operating system 162, the application module 164 required for at least one function. The operating system 162 can be an operating system such as Real Time eXecutive (RTX), LINUX, UNIX, WINDOWS, or OS X.

When the network device 10 is a PGW-C device, the processor 401 is configured to determine that a PDN gateway user plane PGW-U device that establishes a connection with the local device restarts;

The transceiver 402 is configured to send, to the charging server, a resource release request corresponding to the PGW-U device, where the resource release request carries an identifier of the PGW-U device, and the identifier of the PGW-U device And the charging server is configured to release the session resource corresponding to the PGW-U device.

Optionally, the resource release request further carries an identifier of the PGW-C device, where the identifier of the PGW-C device is used by the charging server to release the PGW-U device and the PGW-C The session resource corresponding to the device.

Optionally, the processor 401 is specifically configured to:

Optionally, the transceiver 402 is further configured to:

When the network device 10 is the foregoing charging server, the transceiver 402 is configured to receive a resource release request sent by the PDN gateway control plane PGW-C device, where the resource release request carries the PDN gateway user plane PGW- The identifier of the U device;

The processor 401 is configured to determine, according to the correspondence between the identifier of the PGW-U device and the session resource that is stored in the memory 403, the session resource corresponding to the identifier of the PGW-U device;

The processor 401 is further configured to release the determined session resource.

Optionally, the resource release request further carries an identifier of the PGW-C device.

The processor 401 is specifically configured to:

Corresponding relationship between the PGW-U device, the identifier of the PGW-C device, and the session resource, and the identifier of the PGW-C device in the resource release request and the PGW-U according to the memory 403 The identifier of the device determines the corresponding session resource.

Optionally, the transceiver 402 is further configured to:

The processor 401 is further configured to allocate a session resource to the UE, and establish a correspondence between the identifier of the PGW-U device and the session resource of the UE.

Optionally, the resource release request further carries the restart number of the PGW-U device.

The processor 401 is further configured to:

Based on the same technical concept, an embodiment of the present invention further provides a PGW-C device. As shown in FIG. 5, the PGW-C device includes a determining unit 501 and a sending unit 502, where:

a determining unit 501, configured to determine that a PDN gateway user plane PGW-U device that establishes a connection with the local device restarts;

The sending unit 502 is configured to send, to the charging server, a resource release request corresponding to the PGW-U device, where the resource release request carries an identifier of the PGW-U device, and the identifier of the PGW-U device is used for The charging server releases the session resources corresponding to the PGW-U device.

Optionally, the determining unit 501 is specifically configured to:

Optionally, the sending unit 502 is further configured to:

Based on the same technical concept, the embodiment of the present invention further provides an accounting server. As shown in FIG. 6, the accounting server includes:

The receiving unit 601 is configured to receive a resource release request sent by the PDN gateway control plane PGW-C device, where the resource release request carries an identifier of the PDN gateway user plane PGW-U device;

a determining unit 602, configured to determine, according to a correspondence between the identifier of the PGW-U device and the session resource, the session resource corresponding to the identifier of the PGW-U device;

The release unit 603 is configured to release the determined session resource.

The determining unit 602 is specifically configured to:

Optionally, the receiving unit 601 is further configured to:

The charging server may further include an establishing unit, configured to:

The determining unit 602 is further configured to:

A person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium. The storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

A method for releasing a session resource, the method being applied to a PDN gateway control plane PGW-C device, the method comprising:

Determining that the PDN gateway user plane PGW-U device that establishes the connection with the local device restarts;

And sending, to the charging server, a resource release request corresponding to the PGW-U device, where the resource release request carries an identifier of the PGW-U device, and the identifier of the PGW-U device is used to release the charging server The session resource corresponding to the PGW-U device.
The method according to claim 1, wherein the resource release request further carries an identifier of the PGW-C device, and the identifier of the PGW-C device is used by the charging server to release the PGW. a U-device and a session resource corresponding to the PGW-C device.
The method according to claim 1 or 2, wherein the determining that the PDN gateway user plane PGW-U device that establishes the connection with the local device is restarted includes:

Sending a detection message to each PGW-U device that establishes a connection with the local, and the PGW-U device that has not received the feedback message within the preset duration is determined to be the restarted PGW-U device; or

Receiving a restart notification sent by the PGW-U device that establishes a connection with the local, determining that the PGW-U device restarts.
The method of any of the preceding claims, wherein the method further comprises: before the restarting of the PDN gateway user plane PGW-U device establishing the connection with the local device, the method further comprising:

Sending, to the charging server, a charging request corresponding to the user equipment UE, where the charging request carries an identifier of the PGW-U device and a session identifier of the UE, so that the charging server establishes the PGW a correspondence between the identifier of the U device and the session resource of the UE.
A method for releasing a session resource, wherein the method is applied to an accounting server, and the method includes:

Receiving a resource release request sent by the PDN gateway control plane PGW-C device, where the resource release request carries an identifier of the PDN gateway user plane PGW-U device;

Determining, according to the correspondence between the identifier of the PGW-U device and the session resource, the session resource corresponding to the identifier of the PGW-U device;

Release the determined session resources.
The method according to claim 5, wherein the resource release request further carries an identifier of the PGW-C device;

Determining, according to the corresponding relationship between the identifier of the PGW-U device and the session resource, the session resource corresponding to the identifier of the PGW-U device, specifically:

Corresponding relationship between the identifier of the PGW-U device, the identifier of the PGW-C device, and the session resource, and the identifier of the PGW-C device and the identifier of the PGW-U device in the resource release request, Determine the corresponding session resource.
The method according to claim 5 or 6, wherein before the receiving the resource release request sent by the PGW-C device, the method further includes:

Receiving a charging request sent by the PGW-C device, where the charging request carries an identifier of the PGW-U device and a session identifier of the user equipment UE, where the PGW-U device is a PGW corresponding to the UE U device;

And allocating a session resource to the UE, and establishing a correspondence between the identifier of the PGW-U device and the session resource of the UE.
The method according to any one of claims 5-7, wherein the resource release request further carries the number of restarts of the PGW-U device;

Before the determining the session resource corresponding to the identifier of the PGW-U device, the method further includes:

Determining whether the number of restarts of the PGW-U device is the same as the number of restarts of the PGW-U device whose receiving time is closest to the current time. If not, performing the determining the session corresponding to the identifier of the PGW-U device The steps of the resource.
A PDN gateway control plane PGW-C device, the PGW-C device includes:

a determining unit, configured to determine that a PDN gateway user plane PGW-U device that establishes a connection with the local device restarts;

a sending unit, configured to send, to the charging server, a resource release request corresponding to the PGW-U device, where the resource release request carries an identifier of the PGW-U device, and the identifier of the PGW-U device is used by the The accounting server releases the session resources corresponding to the PGW-U device.
The PGW-C device according to claim 9, wherein the resource release request further carries an identifier of the PGW-C device, and the identifier of the PGW-C device is used for releasing the charging server. a session resource corresponding to the PGW-U device and the PGW-C device.
The PGW-C device according to claim 9 or 10, wherein the determining unit is specifically configured to:

Sending a detection message to each PGW-U device that establishes a connection with the local, and the PGW-U device that has not received the feedback message within the preset duration is determined to be the restarted PGW-U device; or

Receiving a restart notification sent by the PGW-U device that establishes a connection with the local, determining that the PGW-U device restarts.
The PGW-C device according to any one of claims 9-11, wherein the sending unit is further configured to:

Sending, to the charging server, a charging request corresponding to the user equipment UE, where the charging request carries an identifier of the PGW-U device and a session identifier of the UE, so that the charging server establishes the PGW a correspondence between the identifier of the U device and the session resource of the UE.
A billing server, the billing server comprising:

a receiving unit, configured to receive a resource release request sent by the PDN gateway control plane PGW-C device, where the resource release request carries an identifier of the PDN gateway user plane PGW-U device;

a determining unit, configured to determine, according to a correspondence between the identifier of the PGW-U device and the session resource, the session resource corresponding to the identifier of the PGW-U device;

a release unit for releasing the determined session resources.
The charging server according to claim 13, wherein the resource release request further carries an identifier of the PGW-C device;

The determining unit is specifically configured to:

Corresponding relationship between the identifier of the PGW-U device, the identifier of the PGW-C device, and the session resource, and the identifier of the PGW-C device and the identifier of the PGW-U device in the resource release request, Determine the corresponding session resource.
The charging server according to claim 13 or 14, wherein the receiving unit is further configured to:

Receiving a charging request sent by the PGW-C device, where the charging request carries an identifier of the PGW-U device and a session identifier of the user equipment UE, where the PGW-U device is a PGW corresponding to the UE U device;

The billing server further includes an establishing unit, configured to:

And allocating a session resource to the UE, and establishing a correspondence between the identifier of the PGW-U device and the session resource of the UE.
The charging server according to any one of claims 13-15, wherein the resource release request further carries the number of restarts of the PGW-U device;

The determining unit is further configured to:

Determining whether the number of restarts of the PGW-U device is the same as the number of restarts of the PGW-U device whose receiving time is closest to the current time. If not, performing the determining the session corresponding to the identifier of the PGW-U device The steps of the resource.
A system for releasing session resources, characterized in that the system comprises a PDN gateway control plane PGW-C device and a charging server, wherein:

The PGW-C device is configured to determine that a PDN gateway user plane PGW-U device that establishes a connection with the local device is restarted, and sends a resource release request corresponding to the PGW-U device to the accounting server, where the resource release request is carried. An identifier of the PGW-U device, where the identifier of the PGW-U device is used by the charging server to release a session resource corresponding to the PGW-U device;

The charging server is configured to receive a resource release request sent by the PDN gateway control plane PGW-C device, and determine, according to the correspondence between the identifier of the PGW-U device and the session resource, the identifier of the PGW-U device The session resource releases the determined session resources.