KR101442260B1 - Method for synchronizing policy information in policy management system - Google Patents

Abstract

The present invention relates to a policy information synchronization method in a policy management system, and in a policy management system for setting and managing a QoS policy and a billing policy in a communication network such as wired / wireless Internet, portable internet, mobile communication network, etc., It specifies the type of error that occurs between the policy control server and the policy application server that applies the policy that is provided to the network and reports the results. It also sets policy information of the policy control server and policy information of the policy application server By synchronizing, it is possible to reduce the waste of radio resources due to the policy information that has not been deleted, to load the system by accumulating unnecessary information, or to prevent a problem such as a memory leak or a system stoppage. .

To this end, the present invention provides a synchronization method between a policy control database of a policy control server and a policy application database of a policy application server, the method comprising: step; Requesting the policy control server to synchronize the session of the terminal corresponding to the searched policy and the billing control rule; The policy application server requesting the synchronization reports state information of a policy and a billing control rule corresponding to a session of the corresponding terminal to the policy control server; And the policy control server updating the policy control database.

Policy control database, policy enforcement database, policy and billing control rules, synchronization flags, synchronization

Description

METHOD FOR SYNCHRONIZING POLICY INFORMATION IN POLICY MANAGEMENT SYSTEM BACKGROUND OF THE INVENTION [0001]

The present invention relates to a policy information synchronization method in a policy management system, and more particularly, to a policy management system for setting and managing a QoS policy and a billing policy in a communication network such as wired and wireless Internet, portable internet, mobile communication network, The policy control server which determines and provides the policy, the type of the error that occurs between the policy application server that applies the provided policy to the network and reports the result, and the policy information of the policy control server and the policy application server To synchronize the policy information of the policy information in the policy management system.

Policy-based control and management of network devices is required to transmit various types of media in a communication network with service quality suited to their respective characteristics.

As a solution to this problem, the International Forum and the Standardization Organization have defined the Resource Admission Control Function (RACF) and standardized the standard in the NGN structure from the beginning of the standardization of the Next Generation Network (NGN). Here, the resource admission control function refers to a function of reserving a network resource in advance so as to maintain a constant network quality for each session, and controlling the resource to be unaffected by other services.

That is, the resource admission control function monitors the resource status of the transport network, determines whether the service is available when the network resource is requested from the service system, and reserves resources so that the service quality can be maintained by controlling the network equipment . Of course, if resources are insufficient in the network, the service system may inform the service system of the failure result of the resource reservation, so that the service system can take appropriate measures.

Major international standards define admission control, resource reservation, policy control, and gate control as the main functions to be performed by the resource admission control function.

Here, the admission control is a function for judging whether or not to accept a service request by judging the existence of available resources. Resource reservation is a function for reserving resources for exclusive use during a session period, The policy control function is to inform the network equipment and execute the policy. The gate control function is to control the flow of data at the input / output end of the network device to open / close.

The technology for the resource admission control function is being standardized by various international standardization organizations such as ITU-T, TISPAN, 3GPP, WiMAX Forum, MSF, and PacketCable. In the ITU-T, TISPAN, and MSF, standardization of the resource admission control function based on the wired network is standardized. In 3GPP, the resource admission control function for 3G mobile communication network is standardized. In the WiMAX Forum, We standardize the resource admission control function for 'WiMAX' network, and 'PacketCable' standardizes resource admission control function for cable network.

Recently, as the 'All-IP' network is evolving and integrating, the scope of the resource admission control function is expanded to various integrated networks instead of one network. In addition to the resource admission control function, the technology is being developed with a wider policy management system, including various functions for differentiating the service quality and the billing policy control function.

In 3GPP IMS (IP Multimedia subsystem) system, policy decision function named PDF (Policy Decision Function) in 'Release 5' is a lower functional block in Proxy-Call Session Control Function (P-CSCF) Defined as an independent subsystem starting from 'Release 6', provides a policy control function suited to the service quality of various application service system (AF) besides P-CSCF.

In the future, it is defined as 'Policy and Charging Rule Function' (PCRF) integrated with the billing rule control function in 'Release 7', and the subscription profile repository (SPR) corresponding to the policy database and the PCEF Policy and Charging Enforcement Function (PCC) is defined.

Since then, it has evolved into 'Release 8' and has included a variety of radio access technology (RAT) transmission networks.

In case of Mobile WiMAX, 'WiMAX PCC' structure is defined in 'WiMAX Forum'. It is based on PCC structure defined in '3GPP', and even if the terminal changes gateway of gateway, We added PDF (Policy Distribution Function) function to PCRF to reflect characteristics of WiMAX network.

As a result, various methods for dynamically controlling service quality or billing rules by applying differentiated policies to service devices in various communication networks are PCEF function for determining and controlling policies and PCEF function for applying (executing) policies .

For example, in the WiMAX PCC structure of the portable Internet, the PCRF function is implemented in the core network server equipment, and the PCEF function is implemented in the access control router (ACR) ) As a client.

When the subscriber terminal accesses, PCEF and PCRF interwork with each other to perform an IP-CAN Session Establishment procedure. At this time, the PCEF informs the subscriber connection event with the PCRF, and the PCRF obtains the initial policy from the subscriber's profile storage (SPR), determines the policy, and controls the policy to be applied to the control station, the base station, and the terminal.

Then, when the terminal uses a specific service, the service system (AF) transmits the service-related information to the PCRF, and requests each network element to apply a quality or a charging policy required by the corresponding service. The PCRF then determines the policy for the terminal based on the various information, instructs the PCEF, and the PCEF applies the policy content to each network element and executes it.

Next, the VoIP service will be described as an example. When the call connection of the terminal is completed, the call processing service system P-CSCF delivers the detailed information of the call service and the traffic to the PCRF. In the PCRF, And the resource allocation policy necessary for maintaining the quality of service is determined and delivered to the PCEF.

Then, the PCEF secures a separate radio resource for the traffic to be processed by the fixed resource allocation method instead of the best effort method. For this, the control station, the base station, and the terminal are interlocked, and the PCRF reports whether the radio resource allocation has been successfully completed. In addition, when the call is terminated, the PCEF and the PCRF are interlocked to return the allocated radio resource.

On the other hand, PCEF and PCRF are interlocked even when the policy is changed due to an event occurring in the service system linked with the PCRF, or when the policy being executed is damaged due to an event (for example, lack of resources) And maintain the same policy state with each other.

In this way, the PCRF and the PCEF need to exchange policy information and event information in real time with each other. However, due to various errors occurring in the communication, the status inconsistency of each database may appear. Examples of such errors include failure to send a message due to a disconnect between systems, delayed response due to a functional block error or a load, non-response due to an application error, and response to a request processing failure.

That is, when the message is processed only by one system due to the above error, the state of the policy information held by the two systems becomes inconsistent with each other. As this phenomenon continues, wasted radio resources are wasted due to the policy information that has not been deleted, and each system accumulates data that is not owned by the other system, which ultimately loads the system or causes problems such as memory leak or system halt .

In addition, wasted radio resources may occur due to the policy information that has not been deleted. In particular, if the unused radio resource allocation is accumulated, the number of acceptable subscribers is reduced, and the service quality of the other subscribers is deteriorated and the connection failure occurs.

Until now, there has not been a specific state synchronization method for various errors occurring between PCEF and PCRF, and since there is no protocol message for this, a stable and efficient system implementation by organically interworking between implemented systems in accordance with standard technology This was a difficult problem.

It is an object of the present invention to solve the problems of the prior art as described above.

Accordingly, the present invention provides a policy management system for setting and managing a QoS policy and a billing policy in a communication network such as a wired / wireless Internet, a portable Internet, a mobile communication network, etc., and includes a policy control server for determining and providing a policy, And the policy application server reporting the result, and by synchronizing the policy information of the policy control server with the policy information of the policy application server according to the type of each error, unnecessary information accumulates and loads the system The present invention provides a method of synchronizing policy information in a policy management system to prevent a problem such as a memory leak, a memory leak, or a system shutdown.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to another aspect of the present invention, there is provided a method for synchronizing a policy control database of a policy control server and a policy application database of a policy application server, the method comprising: A retrieving step of retrieving a billing control rule; Requesting the policy control server to synchronize the session of the terminal corresponding to the searched policy and the billing control rule; The policy application server requesting the synchronization reports state information of a policy and a billing control rule corresponding to a session of the corresponding terminal to the policy control server; And the policy control server updating the policy control database.

According to another aspect of the present invention, there is provided a synchronization method between a policy control database of a policy control server and a policy application database of a policy application server, the method comprising: A retrieval step of retrieving policy and billing control rules; Transmitting, by the policy application server, status information on a searched policy and a billing control rule to the policy control server; And the policy control server receiving the status information updates the policy control database.

In addition, in the present invention, an application layer processes an error and synchronizes application layer status information in a communication between a policy control server and a policy application server.

The present invention also provides a policy management system for setting and managing a QoS policy and a billing policy in a communication network such as a wired / wireless Internet, a portable Internet, a mobile communication network, etc., And processes the errors that may occur in the communication between the clients reporting the results to the server and synchronizes them so that the policy application state between the servers can be managed consistently.

Further, the present invention classifies and manages the error situation into three types: a connection disconnection between the policy servers, a delayed response, a non-response, and a failure result.

In addition, the present invention automatically synchronizes states using a state-by-session state check message and a state report message in order to solve the problem of a state mismatch due to an error situation during creation, modification, and termination of an application session.

In the present invention, the start of synchronization may be initiated by a policy control server or a policy application server.

Also, according to the present invention, errors between the policy control server and the policy application server are consistently managed, thereby preventing unnecessary data from accumulating or wasting related resources.

In addition, the present invention distinguishes between whether a type of an error occurs when a failure occurs, whether the connection is a connection disconnection between the policy control server and the policy application server, a delayed response or a non-response, or a response result is failure. It is possible to determine whether a current state can be processed without a state mismatch or a state mismatch in the session processing step of the current mobile station, and whether a state mismatch can be minimized by restoring it immediately or a separate synchronization processing is required. When a process is completed and a state mismatch phenomenon can be prevented immediately, a message for recovery is transmitted. If it is determined that a synchronization operation is required in the future, a synchronization necessity flag is set in the policy rule database.

In addition, the present invention may be implemented in a policy control server or a policy application server by initiating various events such as initiation by a periodic synchronization timer, a result of a replay, or a manual request of an operator, A policy control server and a policy application server to retrieve a policy and a charging control rule (hereinafter referred to as PCC rule) that require synchronization and to check the actual state of the rules found in the retrieval, The policy control server and the policy application server are updated to be in the same state according to the state of the " PCC rule ".

The present invention provides a policy management system for setting and managing a QoS policy and a billing policy in a communication network such as a wired / wireless Internet, a mobile Internet, a mobile communication network, etc., And the policy application servers that report the results, and by synchronizing the policy information of the policy control server with the policy information of the policy application server according to the type of each error, It is possible to reduce the waste of radio resources caused by unnecessary information, to load the system due to accumulation of unnecessary information, to prevent problems such as a memory leak or a system stop.

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, Can be easily performed. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an embodiment of a policy management system to which the present invention is applied.

1, the policy management system to which the present invention is applied includes a service server 101 including a P-CSCF of an IP Multimedia Subsystem (IMS), a policy control server (PCRF) 102, (PCC Rule) 103, a subscription profile repository 104, a policy application server (PCEF) 105, a policy application database (PCC Rule) 106, an authentication charging server (AAA) 107, A network device 108, and a user terminal 109.

In more detail, the service server 101 requests policy control for each service and each user in cooperation with the policy control server 102. At this time, the service server 101 generally starts to provide the service according to the request of the user terminal 109.

The policy control server 102 then transmits a policy and a billing control rule (hereinafter, referred to as 'PCC rule') according to the policy for each subscriber and service in the subscription profile storage 104 according to a request from the service server 101 And records it in the policy control database 103.

In addition, the policy control server 102 transmits the determined 'PCC Rule' to the policy application server 105 to request processing, and reflects the result to the policy control database 103 again.

Next, the policy application server 105 processes the request so that it can be applied to the network device 108 and the user terminal 109 that are interlocked with each other according to a request from the policy control server 102, 106).

The policy application server 105 also updates the policy application database 106 with respect to the policy information changed by the event occurring in the network device 108 and the user terminal 109. [

For example, in a portable Internet system, a control station (access control router) corresponds to the policy application server 105, and a network device 108 to be linked is a base station (Radio Access Station).

Also, 'PCC rule', which is information managed in the policy control database 103 and the policy application database 106, should be maintained in the same state.

Also, in an Internet access service such as a portable Internet, an authentication charging server 106, which handles authentication and charging of a terminal, is linked to the policy application server 105.

The procedure from when the user terminal 109 accesses the network to receive the service and then ends the service is divided into the following three processes. The policy control server 102 and the policy application server 105 provide one It is managed as an application session.

IP-CAN Session Establishment Procedure: As the user terminal 109 is assigned an IP address, a single Diameter application session (Session Initiation Protocol) session is established between the policy application server 105 and the policy control server 102 Is generated. At this time, in the case of the portable Internet system, the user terminal 109 in the initial connection state has a kind of initial logical radio channel called ISF (Initial Service Flow). In addition, according to the configuration policy of the portable Internet system, a pre-provisioned service flow (PPSF) may be additionally provided.

IP-CAN Session Modification Procedure: It is a process of dynamically adding, modifying or deleting a separate logical radio channel (Service Flow) for each service to the user terminal 109. The logical radio channel thus added is called a dynamic logical radio channel (Dynamic Service Flow).

IP-CAN Session Termination Procedure: As a procedure for the user terminal 109 to return the IP and terminate the network connection, all the logical radio channels are deleted, and the policy control server 102 and the policy application server (105) deletes status information associated with the corresponding user terminal (109).

2A to 2C are explanatory diagrams of an error type occurring between a policy control server and a policy application server according to the present invention.

2A is a diagram illustrating an example of an error (type I) according to a connection disconnection between a policy control server and a policy application server. The policy control server 102 and the policy application server 105 are connected to each other via a transport layer protocol When a connection is lost, no message can be sent or received. Therefore, all requests and events are shown as failed.

That is, when the user terminal 109 requests the policy application server 105 to terminate the IP-CAN connection session, the policy application server 105 detects that it can not be interworked with the policy control server 102, And returns a response to the user terminal 109 indicating that the connection session has failed to be deleted.

When the service server 101 requests deletion of the 'PCC rule' to the policy control server 102, the policy control server 102 detects that it can not be interworked with the policy application server 105, To the user terminal 109 in response to the failure.

FIG. 2B is a diagram illustrating an example of a delayed response or a non-response type error (Type II). In FIG. 2B, a delayed response is timeout processed when a 'PCC rule' is set.

That is, the policy control server 102 requests the policy application server 105 to apply the 'PCC rule' according to the 'PCC rule' provision trigger from the service server 101.

Thereafter, the policy control server 102 sends a setup failure response of 'PCC rule' to the service server 101 in response to detection of a timeout failure, and then transmits the 'PCC rule' to the policy application server 105 Request deletion of 'PCC rule'.

Thereafter, the policy control server 102 ignores a response to the application request of the 'PCC Rule' transmitted thereto.

FIG. 2C is an exemplary view for explaining an error (Type III) in which a message is normally transmitted and received between the policy control server 102 and the policy application server 105, but the received response result is failed.

2C, (a) shows that the user terminal 109 tries to create the IP-CAN session creation, but the PCC service based on the dynamic dynamic wireless flow channel is not available to the user terminal 109 Therefore, it shows the process of sending a failure response.

That is, although the user terminal 109 requests the policy application server 105 to create an IP-CAN session and the policy application server 105 notifies the policy control server 102 of the creation of the IP-CAN session, The control server 102 detects that the PCC service based on the dynamic logical radio channel is not available to the corresponding user terminal 109 and transmits a failure response to the policy application server 105. Then, the policy application server 105 performs processing for each failure response.

(b) shows a process in which a partial failure occurs in the case of a request including a plurality of 'PCC rules', so that the overall failure response is performed.

As a result, Type I indicates an error due to a connection disconnection between the policy control server 102 and the policy application server 105, Type II indicates an error based on a delayed response or a non-response, and Type III indicates an error due to a failure response .

How to handle the classified error types in the process of creating, modifying, and terminating the IP-CAN session of the user terminal 109 will be described in detail with reference to FIG.

3, the processing for each error type in the connection session processing step of the user terminal 109 can be classified into three types according to the use of the connection session of the user terminal 109, the type of policy, the error type, .

■ Handle errors immediately without changing state.

■ Immediate restoration processing of state mismatch (message processing to prevent the possibility of state mismatch).

■ Classify and handle status synchronization as required (flags the policy database if necessary).

Hereinafter, how each of the error types that can occur in the connection session processing step of the user terminal 109 is processed in consideration of state consistency will be described in detail.

First, when the user terminal 109 accesses the network for the first time, an IP is allocated through the IP-CAN session creation step, and an initial policy (PCC rule) is generated. In this process, the connection to the user terminal 109 is terminated or maintained according to the policy of the service provider irrespective of the type of error, and only the case of not providing the policy-based service is processed.

Thereafter, when there is no state change between the policy control server 102 and the policy application server 105 when the policy application server 105 terminates the connection of the user terminal 109 (1 in Fig. 3) .

Conversely, when the policy application server 105 maintains the connection of the user terminal 109 (② in FIG. 3), the policy control server 102 can not know the fact, and thus a state mismatch occurs. That is, since the policy control server 102 does not know whether the user terminal 109 is connected and the policy information that is initially set, it is impossible to provide the policy-based service. In this case, a flag is set to classify the terminal or policy as a synchronization target so that the policy control server 102 can confirm the synchronization in the subsequent synchronization procedure.

Next, an IP-CAN session modification occurs by an operation such as allocating an additional radio resource to the user terminal 109 to provide differentiated quality for each service. In this case, the IP-CAN session modification is divided into the case of adding or modifying the 'PCC rule' to the corresponding session and the case of deleting the previously created 'PCC rule'.

When a type I error occurs in the case of adding or modifying the 'PCC rule' ((3) in FIG. 3), since the state is not changed, the error process is immediately completed.

If a type II error occurs in the case of adding or modifying the 'PCC rule' (④ in FIG. 3), it is impossible to check whether or not the current policy is being processed. The server 102 sends a 'PCC Rule' deletion request message to the policy application server 105.

When the type III error occurs in the case of adding or modifying the 'PCC rule', if the state is successfully restored (⑤ in FIG. 3), the policy control server 102 and the policy applying server 105 manage There is no state difference between the policy information. That is, it can be handled as a simple policy application failure.

However, when the PCC rule addition / correction is performed, if the rollback fails with respect to the result of the Type III error (⑥ in FIG. 3), the state mismatch occurs, The PCC Rule is deleted or the re-application is requested for the incomplete PCC rule.

If the IP-CAN session modification operation simply deletes the previously generated 'PCC rule' (⑦ in FIG. 3), a flag is set to classify the status of 'PCC rule' as required for all error types . That is, since only one system in the policy control server 102 and the policy application server 105 deletes the 'PCC rule', synchronization is required.

Next, in the IP-CAN session deletion step of terminating the connection by the user terminal 109, it is necessary to delete all the corresponding PCC rules. The type I (connection disconnection) error or the type II (timeout) error (Fig. 3 ⑧), it is classified and processed as an object requiring state synchronization.

In the case where a type III (failure response) error occurs in the IP-CAN session deletion step (9 in FIG. 3), since the policy information has already been deleted as the case where the corresponding session does not exist, the error processing is immediately completed.

In the event that an error occurs in the process of creating an IP connection session but the connection to the terminal is maintained and the policy and billing control rules that were created during the IP connection session modification process are deleted, Out error occurs, the policy control server 102 or the policy application server 105 sets the synchronization flag in the policy and accounting control rule.

FIG. 4 is a flowchart of a synchronization method between a policy control server and a policy application server according to the present invention, in which the policy control server 102 starts synchronization.

First, an IP-CAN session for a plurality of terminals is created between the policy control server 102 and the policy application server 105 (401).

Thereafter, the policy control server 102 initiates state synchronization with an internal or external factor (402). At this time, the factor includes an event such as a preset timer, a reconnection completion of the transport layer, or a manual instruction of the operator.

When the synchronization is started, the policy control server 102 determines whether the synchronization flag is set among all the 'PCC rules' owned by the policy control server 102, the 'PCC rule' that exceeds the set time of the 'PCC rule' (403).

Then, the policy control server 102 transmits a Re-Auth-Request (RAR) message for each IP-CAN session of the terminal including the searched 'PCC rule' to request synchronization (404).

After receiving the RAR message, the policy application server 105 reports the state information of the 'PCC rule' held for the session of the corresponding terminal using a Re-Auth-Answer (RAA) message (405).

After receiving the RAA message, the policy control server 102 compares the 'PCC rule' state held by the policy control server 102 with its own PCC rule to update its database in step 406. At this time, if the 'PCC rule' of the policy application server 105 which is the other party system is to be deleted, the RAR message including the 'PCC rule' deletion request is transmitted to the policy application server 105.

FIG. 5 is a flowchart of another embodiment of a synchronization method between a policy control server and a policy application server according to the present invention, in which the policy application server 105 starts synchronization.

First, an IP-CAN session for a plurality of terminals is created between the policy control server 102 and the policy application server 105 (501).

Thereafter, the policy application server 105 starts state synchronization with an internal or external factor (502). At this time, the factor includes an event such as a preset timer, a reconnection completion of the transport layer, or a manual instruction of the operator.

When the synchronization is started, the policy application server 105 determines whether the synchronization flag is set among the 'PCC rules' owned by the policy application server 105 or the 'PCC rule' (503).

Thereafter, the policy application server 105 transmits the status information on the 'PCC rule' to the policy control server 102 using a CCR (Credit-Control-Request) message (504).

Then, the policy control server 102 updates the policy control database 103 using the CCR message, and then feeds back a credit-control-answer (CCA) message (505). At this time, if the 'PCC rule' of the policy application server 105 needs to be deleted, a 'PCC rule' deletion request is included in the CCA message.

Thereafter, the policy application server 105 deletes the 'PCC rule' if a 'PCC rule' deletion request is included in the CCA message (506).

FIG. 6 is a diagram illustrating a format of RAR, RAA, CCR, and CCA messages in a data meter application protocol used in synchronization between a policy control server and a policy application server according to the present invention.

As shown in FIG. 6, (a) is a format of RAR message and RAA message, and RAA message does not include a request to create or delete 'PCC rule'.

(b) is a format of the CCR message and the CCA message. In case of the CCR message, the 'Event-Trigger' parameter is not included to notify that the message is a synchronization report message, or a specific value may be defined and used to explicitly inform the CCR message.

FIG. 7 is a diagram illustrating an Internet telephone service scenario through a portable Internet, to which the present invention is applied. In an error handling and state synchronization procedure according to the present invention for a state mismatch problem that may occur in a scenario of Internet telephone service over a portable Internet, Indicates the process applied.

First, after a call is started through the initial VoIP call origination processes 1 to 5, the call is started from the service server 101 to the terminal 109 via the policy control server 102 and the policy application server 105, And allocates additional radio resources so that the quality of the Internet telephone can be maintained (6 to 8).

Thereafter, although the VoIP call is released and the AF session is terminated (9, 10), there is a problem that the wireless resources allocated to the call can not be deleted due to an error situation between the policy control server 102 and the policy application server 105 (11, 12), respectively. That is, an error occurred in the IP-CAN session modification procedure.

It can be confirmed that wireless resources are wasted (13).

Therefore, if a synchronization start event occurs when the transmission layer reconnection is performed after setting the synchronization flag for the 'PCC rule' that can not be deleted in the process "12 " (14, 15) The policy application server 105 deletes the 'PCC rule' unnecessarily (steps 16 to 19).

Through this process, radio resources that were wasted by the PCC rule are also released (20).

FIG. 8 is a diagram illustrating another example of an internet telephone service scenario through the portable Internet, to which the present invention is applied. FIG. 8 shows a case where synchronization is first initiated by the policy application server 105, as shown in FIG.

That is, the policy application server 105 suspends the PCC rule for a long time (for example, three hours or more) and starts synchronization (15).

The subsequent operation is the same as that shown in Fig.

As a result, the error processing and state synchronization method between the policy control server and the policy application server according to the present invention can deal with errors that may occur in the IP-CAN session creation, modification, and termination process of the user terminal 109, The status of the 'PCC rule' information between the policy control server 102 and the policy application server 105 is made the same.

Meanwhile, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily deduced by a computer programmer in the field. In addition, the created program is stored in a computer-readable recording medium (information storage medium), and is read and executed by a computer to implement the method of the present invention. And the recording medium includes all types of recording media readable by a computer.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

The present invention can be used for a policy management system or the like.

1 is a configuration diagram of an embodiment of a policy management system to which the present invention is applied;

FIGS. 2A to 2C are diagrams for explaining an error type occurring between a policy control server and a policy application server according to an embodiment of the present invention;

Figure 3 is an explanatory diagram of an error type in the connection session processing according to the present invention;

4 is a flowchart illustrating a synchronization method between a policy control server and a policy application server according to an embodiment of the present invention.

FIG. 5 is a flow chart of another embodiment of a synchronization method between a policy control server and a policy application server according to the present invention;

6 is an exemplary diagram of a data meter application protocol used in synchronization between a policy control server and a policy application server according to the present invention,

FIG. 7 is a diagram illustrating an Internet telephone service scenario through a portable Internet, to which the present invention is applied.

FIG. 8 is a view illustrating another example of an Internet telephone service scenario through a portable Internet, to which the present invention is applied.

DESCRIPTION OF THE REFERENCE NUMERALS

101: service server 102: policy control server

103: Policy control database 104: Subscription profile repository

105: Policy application server 106: Policy application database

107: authentication charging server 108: network device

109: User terminal

Claims (6)

A synchronization method between a policy control database of a policy control server and a policy application database of a policy application server, A retrieval step of the policy control server retrieving a policy and an accounting control rule for which a synchronization flag is set in the policy control database; Requesting the policy control server to synchronize the session of the terminal corresponding to the searched policy and the billing control rule; The policy application server requesting the synchronization reports state information of a policy and a billing control rule corresponding to a session of the corresponding terminal to the policy control server; And Wherein the policy control server updates the policy control database The policy information synchronization method comprising: A synchronization method between a policy control database of a policy control server and a policy application database of a policy application server, A retrieving step of the policy applying server retrieving a policy and a billing control rule in which a synchronization flag is set in the policy control database; Transmitting, by the policy application server, status information on a searched policy and a billing control rule to the policy control server; And The policy control server receiving the status information updates the policy control database The policy information synchronization method comprising: 3. The method according to claim 1 or 2, And transmitting a message requesting deletion of a policy and a billing control rule to the policy application server when the policy control server deletes the policy and the billing control rule from the policy application database The policy information synchronization method further comprising: The method of claim 3, The retrieving step comprises: A policy information synchronization method for searching a policy and a billing control rule for which a creation time or a last modification time exceeds a set time. 5. The method of claim 4, The policy and billing control rules may include: If an error occurs during the IP connection session creation but the connection to the terminal is maintained and the policy and billing control rules that were created during the IP connection session modification process are deleted, a connection disconnection error or a timeout error The synchronization flag is set in any one of the cases where the synchronization information is generated. 6. The method of claim 5, The above- Wherein the policy control server includes at least one of an error due to a connection disconnection between the policy control server and the policy application server, an error due to a delayed response or a non-response, and an error due to a failure response.

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