CN101541100B - Method and device for deleting strategy session - Google Patents

Abstract

The embodiment of the invention discloses a policy session deletion method and device. The method includes the following steps: judging whether the policy session connection between policy enforcement entities is terminated; when the policy session connection is terminated, sending an instruction to delete the policy session information corresponding to the policy session connection to the Diameter domain routing agent DRA; receiving The DRA deletes the response of the policy session information. By applying the present invention, the DRA can delete useless policy session information and connection relation information in time, avoid the adverse effect of invalid redundant information on normal policy connections, and improve communication service quality.

Description

A method and device for deleting a policy session

technical field

The invention relates to the technical field of communications, in particular to a method and device for deleting a policy session. the

Background technique

The bearer of the next-generation communication network has already begun to switch to IP. From the perspective of the development of the communication network, it has experienced such an evolution process from the traditional circuit switching network to the IP packet switching network with separated control and bearer, and then to the all-IP multimedia network. In the process of evolving to an all-IP network, end-to-end QoS issues need to be considered in order to provide services (especially real-time services) that satisfy customers. Because the IP network can provide more types of services (such as multimedia calls, file downloads, web browsing, etc.), the network needs to be able to detect different service flows and count the flow, duration and other billing information to the billing center. In order to solve the above-mentioned QoS and flow-based charging and other related issues, policy and charging control architectures are defined in current communication networks, such as the policy and charging control PCC architecture defined in 3GPP, and the dynamic QoS subsystem architecture defined in WIMAX , through this architecture, the network can detect different service flows, and realize QoS control, billing statistics and other requirements for the service flows. The policy and charging control architecture mainly includes policy formulation functional entities and policy enforcement entities. For example, in the enhancement of the current 3GPP network architecture, as shown in Figure 1, multiple new functional entities (P-GW/Non 3GPP GW/S-GW/ePDG, etc.) are introduced to participate in the PCC policy process of the network, which requires multiple The functional entity needs to establish a PCC policy session with the PCRF (Policy and Charging Control Functional Entity). Among them, PCRF is used to dynamically generate QoS and charging rules for a user service flow according to operating policies, service application information, etc.; the client (P-GW/Non3GPP GW/S-GW/ePDG) is a functional entity that executes policy control rules ; The user terminal needs to access the network service (such as IMS) provided by the operator to initiate a service connection. the

In the policy control network, multiple policy and charging control functional entity PCRFs can be deployed. When a user terminal is connected to a policy control network, a PCRF can be selected from among them. After selection, the policy connection to the policy control network is disconnected. Before opening, this PCRF will be used as the policy control server for this policy connection. Since there are multiple executive functional entities of policy control rules in the network, they need to be The same policy connection accesses PCRF, so the policy control network introduces the policy formulation server management entity DRA to manage the correspondence between the user's policy connection to the policy control network and the PCRF serving the policy connection. When any policy control request sent by any gateway When the message does not carry the target PCRF information, the policy control request message needs to pass through the DRA, and the DRA obtains the target PCRF according to the corresponding relationship between the pre-saved policy connection and the PCRF serving the policy connection, and sends the policy control request message to the target PCRF, so as to ensure that different gateways can use the same PCRF as a policy formulation entity when they request to allocate servers for the same policy connection. the

When the functional entity executing policy control rules establishes a connection with the policy formulation entity for the first time, DRA needs to select an available policy and charging control functional entity and return the information of the selected policy formulation entity to the functional entity executing policy control rules, At the same time, it records the corresponding relationship between the policy connection and the policy formulation entity. According to the record, generate a corresponding relationship table between the policy connection and the policy formulation entity, wherein the policy connection includes user identification, PDN identification, IP address (the IP address includes HoA, CoA) and other information. the

After the policy connection between the functional entity executing the policy control rules and the policy formulation entity is successfully established, the IP address of the PCRF that provides services for the policy connection can be obtained, and the subsequent information exchange can be routed to the corresponding The PCRF of the service policy connection, for example, the policy control request message sent by the functional entity implementing policy control rules to the policy formulation entity carries the target PCRF information. Similarly, when the policy connection is released, the policy control request message indicating the release of the policy connection also carries the destination PCRF information, so it does not go through the DRA. Based on the above reasons, after the policy connection from the user to the policy control network is released, the DRA still stores the corresponding relationship between the policy connection and the PCRF serving the policy connection. the

In order to ensure that in the case of multiple PCRFs in a Diameter area, the policy enforcement entity involved in the policy connection can be associated with the PCRF serving the policy connection, the policy formulation server management entity DRA is introduced, as shown in Figure 2. At the same time, there is only one DRA in the same Diameter domain to handle the process of discovering and selecting the PCRF. In FIG. 2 , the terminal connects to the DRA through each client as a branch to constitute the policy session connection initiated by the terminal. the

The policy enforcement entity establishes a connection with the PCRF of the policy connection service through the DRA management mechanism, but there is no process in the current network protocol for the DRA to delete the correspondence between the pre-saved PCC policy session information and the PCRF of the policy connection service.

Contents of the invention

The problem to be solved by the embodiments of the present invention is to provide a policy session deletion method, and establish a process for the DRA to delete the corresponding relationship between the pre-saved policy session information and the PCRF of the policy connection service, so that the DRA can delete useless policy session information in time and connection relationship information, avoiding the adverse effect of invalid redundant information on normal policy connections, and improving the quality of data transmission. the

In order to achieve the above object, an embodiment of the present invention proposes a method for deleting a policy session on the one hand, including the following steps:

Determine whether the policy session connection between policy enforcement entities is terminated;

When the policy session is fully released, send an instruction to delete the policy session information corresponding to the policy session connection to the Diameter domain routing agent DRA;

When the policy session is not completely released, optionally notify the DRA to delete/update part of the content in the corresponding relationship list between the pre-saved policy connection and the policy connection of the service;

receiving a response from the DRA to delete the policy session information. the

On the other hand, the embodiment of the present invention also provides a policy session deletion method, comprising the following steps:

Receive the policy session connection management message containing the serial number sent by PCRF;

When the sequence number changes, it is determined that the PCRF corresponding to the policy session connection management message is restarted;

Delete policy session information corresponding to before the PCRF is restarted. the

On the other hand, the embodiment of the present invention also provides a PCRF, including:

A session state judging module is used to judge whether the policy session connection between policy enforcement entities is terminated;

A deletion instruction sending module, configured to send an instruction to the DRA to delete policy session information corresponding to the policy session connection when the session state judging module judges that the policy session is completely released; when the policy session is not completely released, Optionally notify the DRA to delete/update part of the content in the list of correspondence between the pre-saved policy connection and the policy connection of the service;

A response information receiving module, configured to receive a response from the DRA for deleting the policy session information. the

On the other hand, the embodiment of the present invention also provides a kind of DRA, including:

A delete instruction receiving module is used to receive an instruction to delete policy session information corresponding to a policy session connection, or to delete an instruction to delete policy session information corresponding to a branch;

The session information matching module is used to associate the instruction received by the deletion instruction receiving module or the instruction corresponding to the policy information of the deletion branch with the policy session information in the DRA, and determine the policy session information corresponding to the instruction;

A session information deletion module, configured to delete the policy session information corresponding to the policy session connection according to the matching result of the session information matching module, and delete the policy session information corresponding to the policy session connection when the policy session connection is completely released Instruction; when the policy session is not completely released, optionally delete/update part of the content in the corresponding relationship list between the pre-saved policy connection and the policy connection of the service;

The deletion response sending module is used to send a confirmation message. the

On the other hand, the embodiment of the present invention also provides a kind of DRA, including:

The timer module is used to detect the duration of the currently stored policy session connection, and set the life cycle of the currently stored policy session connection;

A session state query module, configured to send a message to PCRF to inquire about the currently stored policy session connection state when the timer module detects that the duration of the currently stored policy session connection exceeds the life cycle set by the timer module instruction;

A session policy updating module, configured to delete or update the currently stored policy session information of the policy session connection according to the state of the policy session connection fed back by the PCRF. the

On the other hand, the embodiment of the present invention also provides a kind of DRA, including:

The management message receiving module is used to receive the session connection management message containing the sequence number sent by the PCRF;

The session state judging module is used to determine that the PCRF corresponding to the policy session connection management message is restarted when the sequence number in the session connection management message received by the management message receiving module changes;

The policy session deletion module is used to delete the policy session information corresponding to the PCRF before the restart when the session state judging module determines that the PCRF is restarted;

Delete the result feedback module, which is used to send confirmation messages. the

The technical solution of the embodiment of the present invention has the following advantages, because the method of finding out useless policy session information and deleting it by detecting the connection situation of the policy session is adopted, so that the DRA can delete useless policy session information and connection relationship information in time, The effect of avoiding the adverse effect of invalid redundant information on the normal policy connection and improving the quality of communication transmission is achieved. the

Description of drawings

Fig. 1 is a schematic structural diagram of a 3GPP network architecture enhancement architecture in the prior art;

Fig. 2 is a schematic structural diagram of a Diameter region composed of multiple PCRFs and a DRA in the prior art;

FIG. 3 is a schematic flow diagram of a method for deleting a policy session initiated by PCRF when the policy session connection is completely terminated according to Embodiment 1 of the present invention.

Fig. 4 is a schematic flow diagram of a policy session deletion method initiated by PCRF under the condition that the policy session connection is not completely terminated according to Embodiment 1 of the present invention;

Fig. 5 is the second embodiment of the present invention, a schematic flow diagram of a policy session deletion method actively initiated by PCRF in a non-roaming state;

FIG. 6 is a schematic flow diagram of a policy session deletion method actively initiated by PCRF in a roaming state according to Embodiment 3 of the present invention;

FIG. 7 is a schematic flow diagram of a policy session deletion method initiated by PCRF in a non-roaming state in Non-3GPP according to Embodiment 4 of the present invention;

Fig. 8 is the fifth embodiment of the present invention, a schematic structural diagram of a PCRF;

FIG. 9 is a schematic structural diagram of a DRA according to Embodiment 6 of the present invention;

Fig. 10 is a schematic flow diagram of a method for deleting a policy session by DRA according to the life cycle automatic detection according to Embodiment 7 of the present invention;

Fig. 11 is the eighth embodiment of the present invention, a schematic structural diagram of a DRA;

FIG. 12 is a schematic flow diagram of a method for deleting a policy session by DRA according to sequence number variation detection according to Embodiment 9 of the present invention;

Fig. 13 is a tenth embodiment of the present invention, a schematic structural diagram of a DRA;

Figure 14 is an eleventh embodiment of the present invention, a policy session deletion method in a WIMAX network Schematic diagram of the method flow. the

Detailed ways

In the current network protocol, there is no procedure for the DRA to delete the corresponding relationship between the pre-saved policy session information and the PCRF serving the policy session connection. The DRA caches policy session information of user-related services according to each service initiated by the user. Currently, DRA does not have an information deletion process, which may cause DRA to cache policy session messages of a large number of users after serving user business for a period of time. The specific problems are as follows:

1. The policy session information of the user cached by the DRA exceeds the specified value of the DRA memory, which directly causes the user to be unable to receive the policy and billing information of the communication service network, thereby failing to establish communication services with the communication network. the

2. Due to the redundant language information in the cache, the DRA may incorrectly associate the functional entity that executes the policy control rules with the PCRF allocation request, causing the user to receive the wrong policy and charging information of the communication service network, resulting in communication with the communication network The service could not be established normally. the

3. The DRA cannot be aware of the update of the working status of the PCRF in the domain it manages, so it cannot effectively manage the PCRF in the domain, and the PCRF in the domain cannot meet the dynamic load balancing requirements according to the user communication traffic. the

Therefore, an embodiment of the present invention provides a method for deleting a policy session, which is used to establish a process for the DRA to delete the correspondence between the pre-saved policy session information and the PCRF of the policy connection service, so that the DRA deletes useless policy session information and Connect relational information, avoid the adverse effect of invalid redundant information on normal strategic connections, and improve communication service quality. the

Below in conjunction with accompanying drawing and embodiment, the specific embodiment of the present invention is described in further detail:

Embodiment 1 of the present invention provides a policy session deletion method initiated by PCRF. For the convenience of description, two cases of session connection complete termination and session connection branch termination are used for description:

It should be pointed out that a session connection may contain multiple branches, as shown in Figure 2, in the actual practice process, one or more branches of a session connection may be interrupted, and at the same time A session connection is not fully terminated when one or more legs are still connected; a session connection is only completely broken when all legs of a session connection are broken. the

As shown in Figure 3, it is a schematic flow diagram of the policy session deletion method initiated by the PCRF when the policy session connection is completely terminated, including the following steps:

Step S301, judging whether the policy session connection between the policy enforcement entities is terminated. the

Client A is in the roaming state, has established policy connections with both the V-PCRF in the visited domain and the H-PCRF in the home domain, and saved the corresponding session information and connection policy information through V-DRA and H-DRA. , now the policy control sessions between client A and V-PCRF and H-PCRF are completely terminated. the

Step S302, the V-PCRF sends an instruction to the V-DRA to delete the session policy corresponding to the policy session connection. the

The V-PCRF corresponding to client A judges that the user policy session is completely released according to the policy information of the domain where it is located, so it directly sends a management message to notify V-DRA to delete the corresponding relationship between the pre-saved policy connection and the PCRF serving the policy connection, that is, delete Correspondence between client A and V-PCRF. the

Step S303, V-PCRF receives a response from V-DRA to delete the session policy. the

The V-DRA deletes the correspondence between the pre-saved policy connection and the PCRF serving the policy connection. And confirm to return the confirmation message Ack to V-PCRF. the

Step S304, H-PCRF sends to H-DRA an instruction to delete the session policy corresponding to the policy session connection;

The H-PCRF of the service policy connection in the home domain corresponding to client A judges that the user policy session is completely released according to the policy information of the domain, so the H-PCRF sends a management message to notify H-DRA to delete the pre-saved policy connection and service the policy The corresponding relationship between the connected PCRFs is to delete the corresponding relationship between the client A and the H-PCRF. the

Step S305, the H-PCRF receives a response from the H-DRA to delete the session policy. the

The H-DRA deletes the correspondence between the pre-saved policy connection and the PCRF serving the policy connection, and returns an acknowledgment message Ack to the H-PCRF. the

It should be pointed out that there is no sequence relationship between the above steps S302-S303 and S304-S305, namely The V-PCRF and the H-PCRF perform the session policy deletion work of the corresponding DRA at the same time, and the change of the order does not affect the protection scope of the embodiment of the present invention. the

As shown in Figure 4, it is a schematic flow diagram of the policy session deletion method initiated by PCRF when the session connection is not completely terminated, including the following steps:

Step S401, judging whether the policy session connection between the policy enforcement entities is terminated. the

Client A is in the roaming state, has established policy connections with both the V-PCRF in the visited domain and the H-PCRF in the home domain, and saved the corresponding session information and connection policy information through V-DRA and H-DRA. , now the policy control session between client A and the V-PCRF connected to the service policy in the visited domain is terminated, but the policy control session with the H-PCRF in the home domain is not terminated, that is, client A and V-PCRF The session connection branch with the H-PCRF is terminated, but the session connection branch with the H-PCRF is not terminated. Based on this, it is judged that the policy session connection of client A is not completely terminated. the

Step S402, V-PCRF sends to V-DRA an instruction to delete the policy session information corresponding to the branch;

The V-PCRF corresponding to client A and the H-PCRF connected to the service policy in the home domain judge that the user policy session has not been completely released according to the policy information of the domain, so the V-PCRF sends a management message to inform the V-DRA not to change the pre-saved The corresponding relationship between the policy connection and the PCRF that serves the policy connection, but selectively deletes part of the policy session information, for example, deletes the policy control session related information between the client A and the V-PCRF. the

Step S403, V-PCRF receives the response of the V-DRA to delete the policy session information corresponding to the branch. the

According to the instruction carried in the management message sent by V-PCRF, V-DRA deletes, updates or retains the correspondence between the pre-saved policy connection and the V-PCRF serving the policy connection, and returns an acknowledgment message Ack to V-PCRF. the

Step S404, H-PCRF sends an instruction for processing policy session information to H-DRA;

The V-PCRF corresponding to client A and the H-PCRF connected to the service policy in the home domain judge that the user policy session has not been completely released according to the policy information of the domain, so the H-PCRF sends a management message to notify H-DRA not to change the pre-saved The corresponding relationship between the policy connection and the PCRF serving the policy connection, and since the policy control session between client A and H-PCRF is not terminated, so, It is not necessary to delete the policy control session-related information between client A and the H-PCRF, but if necessary, the session information related to the V-PCRF may be updated if changed. the

Step S405, the H-PCRF receives the response of the H-DRA processing policy session information. the

According to the indication carried in the management message sent by the H-PCRF, the H-DRA updates or retains the correspondence between the pre-saved policy connection and the H-PCRF serving the policy connection, and returns an acknowledgment message Ack to the H-PCRF. the

It should be pointed out that there is no sequential relationship between the above steps S402-S403 and S404-S405, that is, the V-PCRF and H-PCRF simultaneously delete or update the policy session policy of the corresponding DRA, and the change of the order does not affect this The protection scope of the invention embodiment. the

Combined with specific factual scenarios, the method for session deletion initiated by PCRF provided by Embodiment 1 of the present invention can be specifically described through the following two embodiments:

As shown in Figure 5, it is Embodiment 2 of the present invention, a method for session deletion initiated by PCRF in a non-roaming state, comprising the following steps:

In the 3GPP non-roaming state, the S-GW and the P-GW are connected using the GTP protocol. The exchange information on the GTP protocol includes the user ID serving the policy connection, the PDN ID, and the IP address. the

Step S501, terminating the policy connection. the

The S-GW and the P-GW corresponding to the policy connection in the domain complete the policy connection termination through the S5 interface. the

Step S502, the policy session connection with the PCRF is terminated. the

The policy control session is terminated through the S7 interface between the P-GW and the PCRF serving the policy connection in the domain. the

Step S503, judging whether the policy session connection between the PCRF and the terminal is completely terminated. the

The PCRF judges whether the user PCC policy session is completely released according to the policy information of the domain where it is located. the

If the PCC policy session is completely released, the DRA is notified to delete the correspondence between the pre-saved policy connection and the PCRF serving the policy connection. the

If the PCC policy session is not completely released (there are other policy session branches), for example, as shown in Figure 2, two of the three branches initiated by the terminal have been terminated, and one is still maintained, then it is considered that the terminal initiated The PCC policy session is not fully released. DRA does not delete the previously saved The corresponding relationship between the policy connection and the PCRF serving the policy connection, but the PCRF may optionally notify the DRA to delete/update part of the contents in the pre-saved correspondence list between the policy connection and the PCRF serving the policy connection. the

Step S504, the PCRF sends a management message to the DRA. the

The PCRF sends a PCRF management message to the DRA, and the message carries user identification, PDN identification and IP address information. The message instructs the DRA to delete all or to delete/update part of the content in the pre-saved list of correspondences between policy connections and PCRFs. The PCRF may also select different messages to indicate the deletion or deletion/update action of the DRA. the

Step S505, the PCRF receives the operation feedback of the DRA. the

The DRA deletes/updates the corresponding relationship between the pre-saved policy connection and the PCRF serving the policy connection according to the indication carried in the management message sent by the PCRF. And return an acknowledgment message to the PCRF. the

As shown in Figure 6, it is Embodiment 3 of the present invention, a method for session deletion initiated by PCRF in a roaming state, comprising the following steps:

In the 3GPP roaming state, the PMIP protocol is used to connect the S-GW and the P-GW. Moreover, the S-GW is located in the visited domain, and the P-GW is located in the home domain. The exchange information on the PMIP protocol includes the user ID serving the policy connection, the PDN ID, and the IP address. the

In step S601, the S-GW and the V-PCRF serving the policy connection in the V domain complete the policy control session termination through the S7c interface. the

In step S602, the V-PCRF in the visited domain and the corresponding H-PCRF serving the policy connection in the home domain complete the policy control session termination. the

Step S603 , the corresponding V-PCRF and the H-PCRF of the service policy connection in the home domain judge that the user policy session has not been completely released according to the policy information of the domain. The V-DRA (H-DRA) is notified not to change the correspondence between the pre-saved policy connection and the PCRF serving the policy connection. However, the DRA may be instructed to delete part of the content in the list of correspondence between the policy connection and the PCRF serving the policy connection, such as CoA and other information. the

Step S604, V-PCRF (H-PCRF) sends a PCRF management message to V-DRA (H-DRA), and the message carries user ID, PDN ID, and IP address (HoA, CoA) information. the

Step S605 , the V-DRA (H-DRA) updates/retains the corresponding relationship between the pre-saved policy connection and the PCRF serving the policy connection according to the instruction carried in the management message sent by the PCRF. And return an acknowledgment message to the V-PCRF (H-PCRF). the

In step S606, the P-GW and the H-PCRF serving the policy connection in the home domain complete the policy control session termination through the S7 interface. the

Step S607, the H-PCRF judges that the user policy session is completely released. the

In step S608, the H-PCRF sends a PCRF management message to the H-DRA, and the message carries information indicating that the policy session is released successfully. The message carries user identifier, PDN identifier, IP address (HoA, CoA) information. the

Step S609 , the H-DRA deletes the correspondence between the pre-saved policy connection and the PCRF serving the policy connection according to the instruction carried in the management message sent by the H-PCRF. And return an acknowledgment message to the H-PCRF. the

In step S610, the H-PCRF and the V-PCRF serving the policy connection's V-domain complete the policy control session termination through the S9 interface. the

Step S611, the V-PCRF judges that the user policy session is completely released. the

Step S612, the V-PCRF sends a PCRF management message to the V-DRA, and the message carries information indicating that the policy session is released successfully. The message carries user identifier, PDN identifier, and IP address (HoA, CoA) information. the

Step S613 , the V-DRA deletes the correspondence between the pre-saved policy connection and the PCRF serving the policy connection according to the instruction carried in the management message sent by the V-PCRF. And return a confirmation message to the V-PCRF. the

The above second embodiment of the present invention and the third embodiment of the present invention are both described in the embodiment under 3GPP, but it needs to be further pointed out that the scope of protection of the embodiment of the present invention is not limited to 3GPP, and the present invention under other network protocols The embodiments of the invention can also be implemented. Accordingly, under other network protocols, the technical solutions implemented according to the technical ideas provided by the embodiments of the invention should also fall within the protection scope of the invention. the

As shown in Figure 7, it is the fourth embodiment of the present invention, a PCRF in the non-roaming state in Non-3GPP The method for actively initiating session deletion includes the following steps:

In the Non-3GPP non-roaming state, the Access-GW and the P-GW in the home domain are connected using the CMIP protocol. The exchange information on the CMIP protocol includes the user ID serving the policy connection, the PDN ID, and the IP address. the

In step S701, the P-GW and the PCRF corresponding to the policy connection in the domain complete the policy control session termination through the S7 interface. the

In step S702, the PCRF judges that the user policy session part is released according to the policy information of the domain where it is located. the

Step S703 , the PCRF sends a PCRF management message to the DRA, and the message carries an indication policy session part release. And the information of user identification, PDN identification and IP address (HoA, CoA) is carried in the message. the

Step S704, the DRA deletes the correspondence between the pre-saved policy connection and the PCRF serving the policy connection according to the instruction carried in the management message sent by the PCRF, and returns a confirmation message to the PCRF. the

Since the policy session is partially released, only the PCRF correspondence corresponding to the released policy session is deleted, while the PCRF correspondence corresponding to the unreleased policy session is still retained. the

It should be pointed out that if it is determined in step S702 that the user policy session is completely released, all session information and session policies corresponding to the policy session need to be deleted in step S704. the

Step S705 , the Access-GW and the PCRF serving the policy connection in the domain complete the policy control session termination through the S7a interface. the

Step S706, the corresponding PCRF judges that the user policy session is not completely released according to the policy information of the domain where it is located. The DRA is notified not to change the correspondence between the pre-saved policy connection and the PCRF serving the policy connection. However, some policy session information may be selectively deleted, such as information related to policy control sessions. the

In step S707, the PCRF sends a PCRF management message to the DRA, and the message carries user identification, PDN identification, and IP address (HoA, CoA) information. the

Step S708 , the DRA deletes, updates or retains the correspondence between the pre-saved policy connection and the PCRF serving the policy connection according to the indication carried in the management message sent by the PCRF. And return an acknowledgment message to the PCRF. the

Since the policy session is partially released, only the PCRF correspondences corresponding to the released policy sessions are deleted, while the PCRF correspondences corresponding to the unreleased policy sessions are still retained. the

It should be pointed out that, if it is determined in step S706 that the user policy session is completely released, all session information and session policies corresponding to the policy session need to be deleted in step S708. the

For the above-mentioned embodiments 1 to 4 of the present invention, a PCRF is also provided through Embodiment 5 of the present invention, which is used to implement the above-mentioned session deletion method, as shown in FIG. 8 , including:

The session state judging module 1 is used to judge whether the policy session connection between the policy enforcement entities is terminated, or whether the branch of the policy session connection between the policy enforcement entities is terminated;

Deletion command sending module 2, used to send an instruction to delete policy session information corresponding to the policy session connection to the DRA when the session state judging module 1 judges that the policy session connection is terminated, or when the session state judging module judges a policy session between policy execution entities When the branch in the connection is terminated, send an instruction to DRA to delete the session information corresponding to the branch;

The response information receiving module 3 is configured to receive a response from the DRA to delete the policy session information or the session information corresponding to the branch. the

Wherein, the deletion instruction sending module 2 also includes:

The identification information adding sub-module 21 is configured to add user identification, PDN identification and IP address information to the instruction of deleting the policy session information corresponding to the policy session connection or the instruction of deleting the policy session information corresponding to the branch. the

As shown in Figure 9, it is a sixth embodiment of the present invention, a schematic structural diagram of a DRA, including:

Delete instruction receiving module 1, configured to receive an instruction to delete policy session information corresponding to a policy session connection, or to delete an instruction to delete policy session information corresponding to a branch;

The session information matching module 2 is used to associate the user identification, PDN identification and IP address information in the instruction received by the deletion instruction receiving module 1 with the user identification, PDN identification and IP address information in the policy session information in the DRA, Determine the policy session information corresponding to the instruction;

The session information deletion module 3 is used to delete the policy session information corresponding to the policy session connection or delete the policy session information corresponding to the branch according to the matching result of the session information matching module 2;

The delete result feedback module 4 is configured to feed back the result of deleting policy session information. the

Wherein, the session information matching module 2 also includes:

The identification information identification sub-module 21 is configured to identify the user identification, PDN identification and IP address information in the instruction received by the deletion instruction receiving module 1 . the

As shown in Figure 10, it is the seventh embodiment of the present invention, a method for DRA to automatically detect a session according to the life cycle, including the following steps:

Step S1001, generating session connection index information in chronological order. the

Generate index information according to the order in which session connections are established. the

Step S1002 , according to the index information, send an instruction to the PCRF to query the state of the session connection. the

The index information sorted by time notifies the corresponding PCRF in the list in turn to query whether the session corresponding to the current search information is released successfully. the

According to the configured timer, the DRA periodically and automatically queries the duration of the stored policy session messages. And notify the PCRF corresponding to the policy session message exceeding the specified duration of the timer to query whether the policy session connection is released successfully. The PCRF query information includes user identification, PDN identification, and IP address. the

Step S1003, receiving policy session connection state feedback fed back by the PCRF. the

The corresponding PCRF notifies the DRA in the reply message whether the queried policy session connection has been released. the

Step S1004, when the PCRF feeds back that the state of the session connection is terminated, delete the session policy of the current session connection. the

The corresponding PCRF notifies the DRA in the reply message whether the policy connection session queried has been released, and the DRA deletes, updates or retains the corresponding relationship between the pre-saved policy connection and the PCRF serving the policy connection according to the indication carried in the response message sent by the PCRF . If no response message from the PCRF in step S1003 is received, step S1002 is repeated. If step S1002 is repeated many times (for example, 7 times), the PCRF has not responded. Then the DRA assumes that the PCRF fails by default, and automatically deletes the policy connection information of the PCRF service saved in the list. ``

In order to realize the seventh embodiment of the present invention, a DRA is provided through the eighth embodiment of the present invention, As shown in Figure 11, including:

Timer module 1 is used to detect the duration of the currently stored policy session connection, and set the life cycle of the currently stored policy session connection;

Session state query module 2, for when timer module 1 detects that the duration of the policy session connection of current storage exceeds the life cycle set by timer module 1, send to PCRF the instruction of querying the policy session connection state of current storage;

The session policy update module 3 is configured to delete or update the currently stored policy session information of the policy session connection according to the status of the policy session connection fed back by the PCRF. the

Among them, the timer module 1 specifically includes:

The duration detection submodule 11 is used to detect the duration of the currently stored policy session connection;

The life cycle setting sub-module 12 is used to set the life cycle of the currently stored policy session connection. the

As shown in FIG. 12 , it is Embodiment 9 of the present invention, a method for DRA to delete a session according to sequence number variation detection. When PCRF sends a management request message to DRA, sequence number detection is performed. If DRA detects that the management message reported by PCRF If the serial number changes abnormally (PCRF restarts), DRA will automatically delete the pre-saved policy connection and its corresponding relationship, specifically including the following steps:

Step S1201, the PCRF sends a management message to the DRA. This message includes notifying the DRA user whether the policy session is completely released. the

Step S1202, the DRA detects that the sequence number carried in the management message sent by the PCRF has changed abnormally, and deletes the session information. the

The DRA detects the management message reported by the PCRF. If it is detected that the serial number of the management message reported by the PCRF changes abnormally. Then it is determined that the PCRF corresponding to the policy session connection management message is restarted, and it is further determined that the policy session information before the PCRF is completely terminated, and the DRA automatically deletes the pre-saved policy connection corresponding to it. the

Step S1203, returning a management completion response message to the PCRF. the

In order to realize the above-mentioned ninth embodiment of the present invention, through the tenth embodiment of the present invention, a DRA is provided, as shown in FIG. 13 , including:

Management message receiving module 1, used to receive the session connection management message containing the sequence number sent by PCRF;

The session state judging module 2 is used to determine that the PCRF corresponding to the policy session connection management message restarts when the sequence number in the session connection management message received by the management message receiving module 1 changes;

Policy session deletion module 3 is used to delete the policy session information corresponding to PCRF before restarting when the session state judging module 2 judges that PCRF restarts;

The delete result feedback module 4 is configured to feed back the result of deleting policy session information. the

Wherein, the management message receiving module 1 also includes:

The sequence number identification sub-module 11 is used to identify whether the sequence number included in the session connection management message sent by the PCRF has changed. the

It should be further pointed out that under other network protocols, the technical solution about session deletion generated by applying the method of the embodiment of the present invention should also belong to the protection scope of the present invention. As described in Embodiment 11 of the present invention, a method for session deletion in a WIMAX network is provided. In this embodiment, DRA manages the corresponding relationship between A-PCEF and C-PCEF and PDF/PCRF, as shown in Figure 14 shown, including the following steps:

In step S1401, the A-PCEF and the PDF/PCRF corresponding to the policy connection complete the termination of the ASN policy connection through the R3-PCC interface. the

In step S1402, the CSN policy connection is terminated through the R3-PCC between the C-PCEF and the PDF/PCRF serving the policy connection. the

Step S1403, PDF/PCRF judges whether the user's dynamic QoS policy session is completely released according to the policy information of the domain where it is located. If the user's dynamic QoS policy session is completely released, the DRA is notified to delete the correspondence between the pre-saved policy connection and the PCRF serving the policy connection. If the user's dynamic QoS policy session is not completely released (there are other policy session branches), DRA will not delete the correspondence between the pre-saved policy connection and the PCRF serving the policy connection, but PCRF can optionally notify DRA to delete/update the saved Part of the content in the list of correspondence between the pre-policy connection and the PCRF serving the policy connection. the

Step S1404, PCRF sends PCRF management message to DRA, carries user identification in this message identification, PDN identification and IP address and other information. The message instructs the DRA to delete all or to delete/update part of the content in the pre-saved list of correspondences between policy connections and PCRFs. The PCRF may also select different messages to indicate the deletion or deletion/update action of the DRA. the

Step S1405, the DRA deletes/updates the correspondence between the pre-saved policy connection and the PCRF serving the policy connection according to the instruction carried in the management message sent by the PCRF, and returns a confirmation message to the PCRF. the

The management message described in the first to eleventh embodiments of the present invention may be a message set separately, or it may be an instruction to delete the session policy corresponding to the policy session connection described in the first embodiment of the present invention, or to delete the session policy associated with the session connection. The command of the policy session information corresponding to the policy session connection branch. the

The technical solution of the embodiment of the present invention has the following advantages, because the method of finding out useless policy session information and deleting it by detecting the connection situation of the policy session is adopted, so that the DRA can delete useless policy session information and connection relationship information in time, The effect of avoiding the adverse effect of invalid redundant information on the normal policy connection and improving the communication service quality is achieved. the

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is a better implementation Way. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions to make a A terminal device (which may be a mobile phone, a personal computer, a server, or a network device, etc.) executes the methods described in various embodiments of the present invention. the

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention. the

Claims (20)

1. A policy session deletion method is characterized in that, comprising the following steps: Determine whether the policy session connection is terminated; When the policy session is completely released, an instruction to delete policy session information corresponding to the policy session connection is sent to the Diameter domain routing agent DRA; When the policy session is not completely released, notify the DRA to delete/update part of the content in the correspondence list of the policy connection and the policy and charging control functional entity PCRF that serves the policy connection; receiving a response from the DRA to delete the policy session information. 2. The policy session deletion method according to claim 1, further comprising: When the branch in the policy session connection is terminated, an instruction to delete the policy session information corresponding to the branch is sent to the DRA. 3. The policy session deletion method according to claim 2, further comprising: After receiving the instruction to delete the policy session information corresponding to the policy session connection, or the instruction to delete the policy session information corresponding to the branch, the DRA deletes the policy session information corresponding to the policy session connection according to the instruction, or deletes the policy session information corresponding to the branch. Policy session information corresponding to the above branches. 4. The method for deleting a policy session according to claim 1, wherein the policy session information in the DRA is a correspondence between a pre-saved policy session connection and a policy serving the policy session connection and the charging control functional entity PCRF relationships, including: User identification, packet data network PDN identification and IP address information. 5. The policy session deletion method according to claim 2, wherein the command to delete the policy session information corresponding to the policy session connection, or the command to delete the policy session information corresponding to the branch includes a user identifier, a PDN identifier and an IP address Address information. 6. The policy session deletion method according to any one of claims 3 or 5, wherein the policy session information corresponding to the policy session connection is deleted according to the instruction, or the policy session information corresponding to the branch is deleted ,Also includes: combining the user identifier, PDN identifier and IP address information in the instruction to delete the policy session information corresponding to the policy session connection, or the instruction to delete the policy session information corresponding to the branch, with the user identifier, PDN identifier, and IP address information in the policy session information in the DRA, The PDN identifier is associated with the IP address information, and the policy session information corresponding to the instruction is determined. 7. The policy session deletion method according to claim 1, wherein the policy session is specifically: In a 3GPP system, the policy session is a policy and charging control PCC session; or, In the WIMAX system, the policy session is a dynamic QoS session. 8. The policy session deletion method according to claim 2, wherein the command to delete the policy session information corresponding to the policy session connection, or the command to delete the policy session information corresponding to the branch, is specifically: the same message with different parameters; or, Different kinds of news. 9. The method for deleting a policy session according to any one of claims 1 to 3, 5, wherein the instruction or message is a Diameter protocol message. 10. A policy session deletion method is characterized in that, comprising the following steps: Receive the policy session connection management message containing the sequence number sent by the PCRF; When the sequence number changes, it is determined that the PCRF corresponding to the policy session connection management message is restarted; Delete policy session information corresponding to before the PCRF is restarted. 11. The policy session deletion method according to claim 10, wherein the policy session information is specifically: The correspondence between the pre-saved policy session connection and the PCRF serving the policy session connection. 12. A PCRF, characterized in that, comprising: A session state judging module, configured to judge whether the policy session connection between policy enforcement entities is terminated; A deletion instruction sending module, used to send an instruction to DRA to delete the policy session information corresponding to the policy session connection when the session state judging module judges that the policy session connection is completely released; when the policy session is not completely released Notifying the DRA to delete/update part of the content in the list of correspondence between the pre-saved policy connection and the PCRF serving the policy connection; A response information receiving module, configured to receive a response from the DRA for deleting the policy session information. 13. PCRF as claimed in claim 12, is characterized in that, also comprises: The session state judging module is also used to judge whether the branch of the policy session connection between the policy enforcement entities is terminated; The deletion instruction sending module is further configured to send an instruction to the DRA to delete session information corresponding to the branch when the session state judging module judges that a branch in the policy session connection between policy enforcement entities is terminated. 14. PCRF as claimed in claim 12, is characterized in that, described deletion instruction sending module also comprises: The identification information adding submodule is used to add user identification, PDN identification and IP address information to the instruction of deleting the policy session information corresponding to the policy session connection or the instruction of deleting the policy session information corresponding to the branch. 15. A DRA, characterized in that, comprising: A delete instruction receiving module, configured to receive an instruction to delete policy session information corresponding to a policy session connection, or an instruction to delete policy session information corresponding to a branch; A session information matching module, configured to associate the instruction received by the deletion instruction receiving module with the policy session information in the DRA, and determine the policy session information corresponding to the instruction; A session information deletion module, configured to delete the policy session information corresponding to the policy session connection according to the matching result of the session information matching module, and delete the policy session information corresponding to the policy session connection when the policy session connection is completely released; When the policy session is not completely released, delete/update part of the content in the correspondence list between the policy connection and the policy and charging control functional entity PCRF that serves the policy connection; Delete the result sending module, which is used to send confirmation messages. 16. DRA as claimed in claim 15, is characterized in that, described session information matching module also comprises: The identification information identification sub-module is used to identify the user identification, PDN identification and IP address information in the instruction received by the deletion instruction receiving module. 17. A DRA, characterized in that it comprises: The timer module is used to detect the duration of the currently stored policy session connection, and set the life cycle of the currently stored policy session connection; A session state query module, configured to send a message to PCRF to inquire about the currently stored policy session connection state when the timer module detects that the duration of the currently stored policy session connection exceeds the life cycle set by the timer module instruction; A session policy updating module, configured to delete or update the currently stored policy session information of the policy session connection according to the state of the policy session connection fed back by the PCRF. 18. DRA as claimed in claim 17, is characterized in that, described timer module specifically comprises: The duration detection submodule is used to detect the duration of the currently stored policy session connection; The life cycle setting submodule is used to set the life cycle of the currently stored policy session connection. 19. A DRA, characterized in that, comprising: The management message receiving module is used to receive the session connection management message containing the sequence number sent by the PCRF; A session state judging module, configured to determine that the PCRF corresponding to the policy session connection management message is restarted when the sequence number in the session connection management message received by the management message receiving module changes; The policy session deletion module is used to delete the policy session information corresponding to the PCRF before the restart when the session state judging module determines that the PCRF is restarted; Delete the result feedback module, which is used to send confirmation messages. 20. DRA as claimed in claim 19, is characterized in that, described management message receiving module, also comprises: The sequence number identification submodule is used to identify whether the sequence number included in the session connection management message sent by the PCRF has changed.

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