KR101289468B1 - Device of accounting session management for mobile communication system and method thereof - Google Patents

Abstract

The present invention relates to an apparatus and method for performing charging session management in a mobile communication system.

According to the present invention, the billing management device manages the billing session in association with the billing session according to the connection and the billing sub-session according to the service. Such a billing management device includes a billing database, a billing session manager and a billing subsession management. The billing database includes a billing session management table that divides the billing information collected into a billing session and a billing sub-session. The charging session manager manages the charging session by allocating the charging session information according to the charging start to the charging session management table. The billing subsession manager manages the billing subsession by interworking with the billing session manager and adding billing subsession information according to the service connection addition to the billing session management table.

In this way, it is possible to more efficiently manage the billing by linking and managing the billing session and the billing sub-session.

Billing session, billing subsession

Description

Device and method for performing charging session management of mobile communication system

1 is a block diagram of a portable Internet network according to an embodiment of the present invention.

2 is a schematic block diagram of a billing client including a billing management device according to an embodiment of the present invention.

3 is a diagram schematically illustrating a charging session management table according to an embodiment of the present invention.

4 is a diagram illustrating a charging session management table access method according to an embodiment of the present invention.

5 is a diagram illustrating a method of transitioning a charging session state in a charging session manager according to an embodiment of the present invention.

6 is a diagram illustrating a method of transitioning a charging subsession state in a charging subsession manager according to an exemplary embodiment of the present invention.

7 is a flowchart illustrating adding a billing session management table in a billing session manager according to an embodiment of the present invention.

8 is a flowchart illustrating a procedure of changing a billing subsession management table according to a service change of a billing subsession manager according to an embodiment of the present invention.

The present invention relates to an apparatus and method for performing charging session management in a mobile communication system. More specifically, it is for managing a charging session and a charging sub-session in a base station or a packet access router, which is a charging client of a portable Internet system capable of providing various services.

Billing in mobile networks, wireless Internet and wired Internet transfers the billing information collected from each access network to the billing server via the RADIUS protocol or the Diameter protocol.

The Radius and Diameter protocols define billing multi-sessions, sessions, and billing sub-sessions. In addition, the basic billing session management method for each billing client is described and applied to the billing session management of users who use the existing wired and wireless Internet.

However, in the case of a portable Internet system, mobile Internet billing and Mobile IP (INTERNET PROCOTOL) billing can be integrated or managed separately, and several service flows can be set up according to the resources required by the user. It is more efficient to use the charging method suitable for the portable Internet system.

For this purpose, the mobile Internet accounting using the diameter can be newly defined, and for this purpose, a billing session and billing sub-session management in a billing client is required, but is not currently defined.

In other words, a portable Internet system in which a user can establish multiple connections can manage the user's connection as a session and map each connection to a charging sub-session. When the user's connection is complete, the connection to that user is all disconnected and these billing sessions and billing subsessions must be interconnected and managed.

Accordingly, an aspect of the present invention is to provide an apparatus and method for managing a billing session and a billing subsession for a user, a service, a billing data collection and transmission to a user using various services.

In order to achieve the above-described problem, the billing management device according to the characteristics of the present invention,

A billing management device of a mobile communication system, comprising: a billing session management table for classifying collected billing information into a billing session and at least one billing sub-session according to the billing session; Database; A billing session manager configured to manage the billing session by allocating billing session information according to billing start to the billing session management table; And a billing subsession manager configured to manage the billing subsession by adding billing subsession information according to a service connection addition to the billing session management table in association with the billing session manager.

Charging management method according to a feature of the present invention,

A method of managing a billing by a billing management device of a mobile communication system, the method comprising: requesting a billing start to a billing server of a mobile communication system when an access terminal accesses a mobile communication network; And when the response to the charging start request is received from the charging server, the collected charging information into a charging session based on a connection of the access terminal and a charging sub session based on a service of the access terminal. Storing the billing session management table separately.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Also, when a part is referred to as "including " an element, it does not exclude other elements unless specifically stated otherwise.

In addition, the term module described herein refers to a unit for processing a specific function or operation, which may be implemented in hardware or software, or a combination of hardware and software.

An apparatus and method for performing charging session management in a mobile communication system according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

At this time, according to the embodiment of the present invention, the mobile communication system implements a portable Internet system.

1 is a block diagram of a portable Internet network according to an embodiment of the present invention.

According to FIG. 1, the portable Internet network 1 includes an access terminal (AT) 100, an access point (AP) 200 performing a base station function, a packet access routing function, and an external mobile IP. Packet Access Router (PAR) 300 performing the agent function, Authentication, Authorization, Accounting (AAA) server 400 performing the authentication, authorization verification and billing functions, and HA, the home agent of Mobile IP 500.

The portable Internet network 1 may interwork with other provider networks 2 through the AAA server 400 and may use a diameter protocol for this purpose.

According to an embodiment of the present invention, the charging information collected by the AP 200 and the PAR 300 is transmitted to the AAA server 400, where the PAR 300 performs the charging client function and the AAA server 400. ) Performs the billing server function.

2 is a schematic block diagram of a billing client including a billing management device according to an embodiment of the present invention. The charging client of FIG. 2 may be included in the packet access router 300 of FIG. 1, and the packet access router 300 will be described below as a charging client.

The packet access router 300 may include a charging management device 310, an initialization management unit 320, an external agent control unit 330, an access and handoff control unit 340, an AP interface control unit 350, a diameter control unit 360, A stream control transmission protocol (SCTP) / IP security protocol (IPsec) unit 370 is included.

The initialization manager 320 manages initial synchronization of the packet access router 300.

The external agent controller 330 controls the Mobile IP external agent charging process.

The access and handoff controller 340 performs charging session management according to the portable Internet access and the handover.

The AP interface controller 350 delivers the charging information collected by the AP 200.

The diameter control unit 360 transmits the charging information to the AAA server 400.

The stream control transmission protocol (SCTP) / IP security protocol (IPsec) unit 370 performs communication and security with the AP 200 and the AAA server 400.

The billing management device 310 interfaces with the initialization manager 320 for initial synchronization of the packet access router 300 and interfaces with the external agent controller 330 to process Mobile IP external agent charging. In addition, it interfaces with the access and handoff control unit 340 to manage the charging session according to the portable Internet access and handover, and interfaces with the AP interface control unit 350 to obtain the charging information collected by the access point 200. In addition, the AAA server 400 interfaces with the diameter control unit 360 to transmit the charging information. In addition, the AP interface controller 319 and the diameter interface unit 318 in the packet access router 300 communicate with the AP 200 and the AAA server 400 through SCTP, and may use IPSEC for security.

The billing management device 310 may include a timer manager 311, a billing policy manager 312, a billing database 313, a billing database manager 314, a billing information collector 315, a billing session manager 316, The billing sub-session manager 317, the diameter interface 318, and the AP interface 319 are included.

The timer manager 311 manages a timer for transitioning the charging session state or the charging subsession state, and the charging policy manager 312 manages various charging policies.

The billing database 313 stores a billing session management table and may store billing information when a billing transmission fails. The billing database manager 314 manages a billing session management table stored in the billing database 313. In such a billing session management table, the access of the terminal is managed as a session, and a plurality of service connections according to the access of the terminal are divided and managed as respective billing subsessions.

The charging information collecting unit 315 collects charging information from the AP 200 or charging information inside the packet access router 300.

The billing session manager 316 manages the billing session using the billing session management table, and the billing subsession manager 317 is linked with the billing session manager 316 to manage the billing subsession information using the billing session management table. do.

The diameter interface unit 318 transmits the charging information to the AAA server 400, and the AP interface unit 319 is in charge of the interface with the AP 200.

Next, the charging session management table stored in the charging database 313 will be described in detail with reference to FIG. 3.

3 is a diagram schematically illustrating a charging session management table according to an embodiment of the present invention.

According to FIG. 3, the charging session management table 600 includes an index 601, access information 602, session state 603, session information 604, recent charging information 605, Mobile IP index 606, The billing subsession number 607 and the billing subsession information table 608 are included.

The index 601 is for classifying the charging session management table according to the session.

The access information 602 is an identification of an access terminal between an AP and a packet access router, such as an IP address allocation type, an IP management mode, an authentication policy, an access terminal's media access control (MAC) address, and information about an access terminal's portable Internet access. It includes the context identifier used and the cell identifier information to which the access terminal is connected.

The session state 603 includes information regarding the charging session state of the access terminal corresponding to the charging session management table, and the session information 604 shares session information with the AAA server (400 in FIG. 1) for the access terminal. Session ID, a destination Realm of the AAA server 400, a destination Host, a record number, a user name, an IP address of an access terminal, a multi-session ID, and intermediate interval information with the access terminal.

The recent charging information 605 includes record type, record number, wireless packet usage, event time, billing subsession status, and next access control router (ACR) information which can be referred to when charging after handoff between APs.

Mobile IP index 606 includes session index information for Mobile IP charging for Mobile IP charging when Mobile IP users are registered. Here, the Mobile IP index 606 may not be included in the charging session management table when the AT (100 in FIG. 1) does not use Mobile IP.

The billing subsession count 607 includes the number of billing subsessions according to the services created by the access terminal, and the billing subsession information table 608 contains the billing subsession ID, flow index, and record type for each billing subsession. , Billing subsession state, scheduling type for service flow, flow start time, direction of service flow, uplink reserve resource amount, downlink reserve resource amount, service name and global service name information.

FIG. 4 is a diagram illustrating a method of accessing a charging session management table according to an embodiment of the present invention, and is a view for explaining the method of accessing a charging session management table shown in FIG. 3.

According to Figure 4, the charging session management table access consists of access control access from the AP and access from the AAA server.

Access control access from the AP (200 in FIG. 2) is by context ID.

Specifically, the charging session management unit 316 of FIG. 2 may include a context ID included in the charging collection start / end request received from the AP 200 and the charging information collected by the AP through the AP interface unit 319 of FIG. 3. Access the billing session management table by (CID). For example, the billing session manager 316 may add, search for, and delete a billing session respectively by requesting 'InsertSession (CID)', 'SearchIndex (CID)', and 'DeleteSession (CID)'. And by adding, deleting, and retrieving by the charging sub-session management unit ('InsertFlow (CID, FlowID)', 'DeleteFlow (CID, FlowID)', and 'SearchFlow (CID, FlowID)' as a service flow for each context ID). have.

Access from the AAA server uses identifiers, which are either session IDs or session IDs and charging subsession IDs.

If the session table is found by the session ID, the index of the session ID table is obtained by using the hash type of the session ID of the string type, and the index of the session management table 600 for the session is obtained from the session ID index table. use.

5 is a diagram illustrating a method of transitioning a charging session state in a charging session manager according to an embodiment of the present invention. The session state and the events in each state shown in FIG. 5 include only normal cases, and for a variety of abnormal cases, a very large number of cases will be omitted.

The exchange of messages between the billing session manager 316 of FIG. 2 and the AP 200 of FIG. 2 is performed through the AP interface, and the description of the AP interface is omitted below.

According to FIG. 5, the charging session state includes a first charging session closed state 701, an initial charging session waiting state 702, a charging session open state 703, an AP charging collection state 704, a charging session end waiting state ( 705, a second charging session closed state 706, a MIP charging session waiting state 707, a final MIP charging session waiting state 708, a charging subsession state 709, and an intermediate charging session waiting state 710. do.

Here, each of the billing session states is as follows.

The first charging session closed state 701 indicates a state before the charging session is opened, and the initial charging session waiting state 702 indicates a state of transmitting and waiting for a charging start request message to the AAA server. The charging session open state 703 indicates a state in which initial charging information is set. The AP charging collection state 704 indicates a state of waiting for charging information being collected from the AP. The charging session end wait state 705 represents a state waiting for a response to the charging end from the AAA server. The second charging session closed state 706 indicates that the charging session is closed. The MIP charging session waiting state 707 indicates a state for processing a charging message of a user using Mobile IP. The final MIP charging session waiting state 708 indicates that the MIP charging end record is sent to the AAA server when the MIP charging end message is received and the MIP session is open. The billing subsession state 709 transmits a user's connection addition message to the billing management device when a service flow is newly generated by a request of an access terminal in the billing session open state 703 and a billing start event for the billing subsession. Indicates the set state. At this time, the charging sub-session state 709 may include a plurality according to the new service flow. The intermediate charging session waiting state 710 indicates a state of sending intermediate charging information to the AAA server and waiting for a response according to the charging interim determined by the AAA server.

The following describes the charging session state transition method through the charging session state described above.

Before the access terminal (100 in FIG. 1) accesses the portable Internet network 1, the charging session manager (316 in FIG. 2) is in the first charging session closed state (701). In this state, when the charging session management unit 316 receives the charging start request message from the access and handoff control unit 340 of FIG. 2, a charging record for charging start is created and transmitted to the AAA server 400 of FIG. 2. The state transitions to the initial charging session waiting state 702 (S101).

When the charging session manager 316 receives a response message for starting charging from the AAA server 400, the charging session manager 316 generates an entry in the charging session management table and transitions from the initial charging session wait state 702 to the charging session open state 703. (S103).

The charging session manager 316 may generate a new service flow in response to a request of an access terminal in the charging session open state 703, and receives a connection addition message of the user from the access and handoff controller 340. In this case, the charging start event for the charging sub-session is set (S105) and the charging sub-session management unit 317 generates the charging sub-session state 709.

The billing subsession manager 317 generates the billing subsession state 709 according to the service connection addition request of the access and handoff controller 340, deletes the billing subsession state, and deletes the billing subsession count after deleting the link. Then, the related state is managed in the charging session management table (S125 and S127).

In the charging session open state 703, the charging session manager 316 may start charging for a user who uses Mobile IP. When the external agent controller 330 notifies the start of Mobile IP, the AAA sends a Mobile IP start message. After transmitting to the server 400, the transition to the MIP charging session waiting state (707) (S113).

The billing session manager 316 adds MIP billing session information when the MIP billing waiting state 707 receives a response message for starting MIP billing from the AAA server 400, and then transitions to the billing session open state 703 again. (S115).

When the billing session manager 316 receives the MIP billing end message in the billing session open state 703 and the MIP billing session is open, the billing session manager 316 transmits a MIP billing end record to the AAA server 400 and waits for the final MIP billing state 708. (S117, S119).

In the charging session open state 703, the charging session manager 316 receives a message for collecting charging data for intermediate charging or termination to the AAA server 400 when a timer expires or charges termination request for intermediate charging is received. To send). In response to receiving the response from the AP 200, the UE transitions to the AP charging collection state (S107).

The billing session manager 316 transmits a billing record for the intermediate billing to the AAA server 400 after the billing information collected by the AP 200 in the AP billing collection state 704 is for intermediate billing. Transition to the standby state 710 (S131).

If the billing session management unit 316 is for termination of the billing collection information received from the AP 200, the billing session for transition to the AAA server 400 and then transitions to the billing session end wait state (705). (S109).

If the charging session management unit 316 receives a response from the AAA server 400 for the intermediate charging in the intermediate charging session waiting state 710, the charging session management unit 316 changes the latest collected charging information and transitions to the charging session open state 703 (S129). ).

The billing session manager 316 receives a response from the AAA server 400 by the billing termination in the billing session termination wait state 705, sends a MIP termination billing message if a MIP session exists, and waits for the final MIP billing session. Transition to 708 (S121).

The charging session manager 316 receives a response from the AAA server 400 for the MIP charging termination in the final MIP charging session waiting state 708 and deletes the MIP session information if the charging session is still open. After the MIP session is closed, the process transitions to the charging session open state 703 (S119). When the accounting session is in the closed state, all information in the related accounting session management table is deleted and the process transitions to the second accounting session closed state 706 (S123).

6 is a transitional sub-session state transition diagram in accordance with an embodiment of the present invention.

According to FIG. 6, the charging subsession manager 317 generates and releases the charging subsession state when the service flow is generated, the service flow is released, or the user is released.

These charging subsession states are: first charging subsession closed state 801, initial charging subsession waiting state 802, charging subsession open state 803, AP charging subsession collection state 804, intermediate charging subsession A waiting state 809, a charging subsession termination wait state 805, a second charging subsession closed state 806, a charging subsession change wait state 808, and an AP charging subsession collection change state 807. .

Here, each of the billing session states is as follows.

The first charging subsession closed state 801 indicates a closed state that is before the charging subsession is opened. The initial charging subsession waiting state 802 indicates a state of receiving a charging subsession start request message and transmitting a charging record for starting the charging subsession to the AAA server 400. The charging subsession open state 803 indicates a state of receiving a charging subsession start response message and adding charging subsession information to a corresponding charging session management table. The AP billing subsession collection state 804 indicates a state in which billing is being collected from the AP 200. The middle billing subsession waiting state 809 indicates a state in which a billing record for middle billing is transmitted when the billing collection completion information by the AP 200 for the middle billing transmission is received. The charging subsession termination wait state 805 indicates a state of receiving a response from the AAA server 400 for termination of the charging subsession. The second charging subsession closed state 806 indicates a state of deleting and notifying the charging subsession information for terminating the charging subsession. In the charging subsession change waiting state 808, if the information on the charging subsession is changed by the dynamic service change (DSC) request of the access terminal in the charging subsession open state 803, the AP 200 used before the change may be used. ) Is used to indicate to the AP 200. When the AP billing sub-session collection change state 807 receives usage collection information on the flow before the change in the billing sub-session change waiting state 808, the AP billing sub-session collection change state 807 performs a record transmission for terminating the charge for the previous flow. Indicates the state.

Next, a method of transitioning the charging subsession state as described above by the charging subsession manager 317 is described below.

The billing subsession manager 317 transmits a billing record for billing subsession start to the AAA server 400 when a billing subsession start request message is received in the first billing subsession closed state 801 before the billing subsession is opened. In step S201, the process proceeds to the initial charging sub-session waiting state 802.

When the charging subsession manager 317 receives a response message from the AAA server 400 for starting the charging subsession in the initial charging subsession waiting state 802, the charging subsession manager 317 adds the charging subsession information to the corresponding charging session management table information. The number of billing subsessions is increased and the process transitions to the billing subsession open state 803 (S203).

If the charging subsession manager 317 changes the information of the charging subsession in response to a service flow change (DSC) request of the access terminal 100 in the charging subsession open state 803, the AP used before the change ( The amount of usage of the 200 is requested to the AP 200 and the state transitions to the charging subsession change waiting state 808 (S211).

When the billing subsession manager 317 receives the usage collection information on the flow before the change in the billing subsession change waiting state 808, the billing subsession manager 317 transmits a record for terminating the billing for the previous flow and the AP billing sub Transition to the session collection change state 807 (S213).

When the billing subsession manager 317 receives a response from the AAA server 400 for the previous billing end, the billing subsession manager 317 generates a billing start record having the new billing subsession information and transmits the billing start record to the AAA server 400 and initializes the bill. Transition to the charging sub-session waiting state 802 (S215).

When the intermediate charging timer expires in the charging subsession open state 803, the charging subsession manager 317 requests the intermediate charging information to the AP 200 and transitions to the AP charging subsession collection state 804 (S205). .

When the charging subsession manager 317 receives the charging termination request for the charging subsession, the charging subsession manager 317 makes a request for collecting the charging data to the AP 200 and transitions to the AP charging subsession collection state 804 (S205).

If the charging sub-session management unit 317 receives the charging collection completion information by the AP 200 for the intermediate charging in the AP charging sub-session collection state 804, after transmitting the charging record for the intermediate charging, the intermediate charging sub-session Transition to the standby state 809 (S217).

When the charging subsession manager 317 receives a response from the AAA server 400 for the intermediate charging in the intermediate charging subsession waiting state 809, the charging subsession manager 317 transitions to the charging subsession open state 803 after changing the latest charging information. (S219).

If the charging sub-session management unit 317 receives the charging collection completion message for termination in the AP charging sub-session collection state 804 from the AP 200, transmits a charging record for termination to the AAA server 400 and then charges the sub Transition to the session end wait state 805 (S207).

When the charging subsession manager 317 receives a response from the AAA server 400 for the termination of the charging subsession in the charging subsession termination wait state 805, the charging subsession manager 317 deletes the information on the charging subsession and the status is determined. Reflected in the management table (S209).

7 is a flowchart illustrating adding a billing session management table in a billing session manager according to an embodiment of the present invention.

According to FIG. 7, when the charging start request message is received from the access and handoff control unit 340 (S301), the charging session manager 316 selects the session using the Context ID in the message that can identify the access terminal 100. In operation S303, it is determined whether a corresponding session is generated based on the result (S305).

As a result of the determination, if there is a corresponding session, an error message is generated (S307), the reason for the failure is described in the charging start response message, transmitted to the access and handoff controller 340 (S309), and then terminated.

As a result of the determination, if there is no corresponding session, a new index is allocated (S311) and the access information is stored in the charging session management table 600 (S313).

Next, a charging start record is generated (S315) and a charging request message is transmitted to the AAA server 400 (S317).

The charging message transmitted to the AAA server 400 is stored as the latest charging information (S319) and the charging session state is changed to the initial charging session waiting state (S321).

When the AAA server 400 receives the charging response message for the charging start (S323), the charging session information is stored in the charging session management table 600 (S325), and the charging session state is changed to the open state (S327) and ends. do.

8 is a flowchart illustrating a change of a billing subsession management table of a billing subsession manager according to an embodiment of the present invention, and shows a flow of billing subsession information when a service flow of an access terminal is changed.

According to FIG. 8, when the charging sub-session management unit 317 receives the user service information change message from the access and handoff control unit 340 (S401), it is determined whether the context ID in the message is in the charging session management table 600. Check (S403, S405).

As a result of the check, if there is a session for the corresponding context ID, the flow index for the service flow of the previous flow for the session is searched (S407).

If the result of the search is that there is no billing subsession or the billing subsession is not in billing subsession open state (S409), an error message is generated (S411) and the billing flow including the relevant error message to the connection and handoff control unit 340. The response message for the change is transmitted (S413), and the flow ends.

Even when there is no session for the context ID, an error message is generated (S411), and a response to the charging flow change including the failure reason is transmitted to the access and handoff controller 340 (S413), and then the service flow change process is terminated. do.

If the state of the billing subsession for the service flow requesting the change is in the open state, the request for billing collection for the usage measurement for the flow that is the previous billing subsession is requested to the AP 200 (S415).

Next, after changing the state of the billing subsession to the billing subsession change waiting state (S417) and receiving the billing collection information on the previous flow from the AP 200 (S419), the billing record for the billing termination for the previous flow. This is transmitted to the AAA server 400 (S421).

Transitioning the billing subsession state to the AP billing subsession collection change state (S423) and receiving a response to the billing subsession termination for the previous flow from the AAA server 400 (S425) billing subsession for the new flow. A start record is created and transmitted to the AAA server 400 (S427).

The state of the charging sub-session is changed to the initial charging sub-session waiting state (S429), and a response message for a new service flow that is a new charging sub-session is received from the AAA server 400 (S431). Then, the state of the billing subsession is changed to the billing subsession open state (S433) and the billing subsession change procedure is terminated.

The embodiments of the present invention described above are not only implemented by the apparatus and method but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded, The embodiments can be easily implemented by those skilled in the art from the description of the embodiments described above.

The scope of the present invention is not limited to the above-described embodiments, but various modifications and improvements of those skilled in the art using the basic concept of the present invention as defined in the following claims are also within the scope of the present invention.

As described above, according to the embodiment of the present invention, it is possible to efficiently manage the charging session and the charging subsession suitable for the portable Internet system.

The portable Internet system can generate a plurality of service flows for each user, thereby enabling the charging for each user and service flow by managing the charging sub-sessions for the charging session. In addition, this can be reflected in the billing sub-session when the user logs off or disconnects from the system.

In addition, it is possible to charge the user more accurately by managing the billing sub-session state to reflect this when changing the service flow information of the user.

Claims (24)

In the charging management device of a mobile communication system, A billing database including a billing session management table for classifying and managing the collected billing information into a billing session and at least one billing sub-session according to the billing session; When the charging start request of the access terminal is received from the access point, it is checked whether a charging session corresponding to the access terminal exists in the charging session management table by using the context identifier included in the charging start request, and the charging session is A charging session manager configured to store information of the charging session in the session management table when a response to the charging start request is received from the charging server if not present; And When interworking with the accounting session management unit and receiving a service connection addition request from the access point, a billing subsession is generated according to the service connection addition request and information on the generated billing subsession is added to the billing session management table. When the service change request of the access terminal is received from the access point, it is determined whether there is a charging subsession corresponding to the service to be changed in the charging session management table by using the context identifier included in the service change request. Billing subsession manager to check and perform billing subsession change procedure Charging management device comprising a. The method of claim 1, The charging session management table, And an index for identifying the charging session, access information of an access terminal, status information of the charging session, information of the charging session, and information of the charging subsession. 3. The method of claim 2, The charging session management table, A billing management device further comprising mobile internet protocol session index information. delete delete The method of claim 1, The billing subsession manager, And requesting a billing termination request of the service to be changed to a billing server and, if a response is received, adding a billing sub-session according to the service change request to the billing session management table. delete delete The method of claim 1, The charging session manager, And an apparatus for accessing the accounting session management table using an identifier of a accounting session obtained from a accounting server or an identifier of an access terminal obtained from an access point. The method of claim 1, The billing subsession manager, And an apparatus for accessing the accounting session management table by using the accounting session identifier obtained from the accounting server and the accounting sub-session identifier. The method of claim 1, A charging management device included in a packet access router that performs a packet access routing function and an external agent function of the mobile Internet protocol. In the charging management device of the mobile communication system to manage the charging, Dividing the collected billing information into a billing session and at least one billing sub-session according to the billing session and storing the billing session in a billing session management table; When the access terminal accesses a mobile communication network, receiving a charging start request from the access point; Checking whether a charging session corresponding to the charging start request exists in the charging session management table by using an identifier of an access terminal corresponding to the charging start request; Requesting to start charging with a charging server if the charging session does not exist; Storing information of the charging session in the session management table when a response to the charging start request is received from the charging server; Adding a subsession generated in response to a request for adding a service connection of the access terminal to the session management table; And If the service for the access terminal that was receiving the service is terminated, deleting and terminating the charging session and the charging sub-session related to the service from the charging session management table; Billing management method comprising a. delete delete The method of claim 12, The adding step, Receiving a request for adding a service connection of the access terminal; Requesting the charging server to start charging according to the service connection addition request; And When receiving a response according to the request, adding information on the charging sub-session according to the service connection addition to the charging session management table. Billing management method comprising a. delete The method of claim 12, Receiving a service change request of the access terminal; Checking whether the identifier of the access terminal obtained from the service change request of the access terminal is in the charging session management table; If the identifier of the access terminal is in the charging session management table, retrieving a charging subsession corresponding to a previous service; And Performing a charging subsession change procedure when the charging subsession is found; Billing management method comprising more. 18. The method of claim 17, The performing of the charging subsession change procedure may include: Requesting and receiving the service usage amount of the access terminal before the service change request; Requesting the billing server for a billing termination request for a service before the service change request by using the received service usage of the access terminal; And If a response is received from the charging server, generating a charging sub-session according to the service change request and performing charging start for the charging sub-session. Billing management method comprising a. The method of claim 12, Requesting to start charging for a mobile internet protocol session to the charging server; And Adding information on the mobile internet protocol session to the charging session management table when receiving a response to the charging start request from the charging server; Billing management method comprising more. delete The method of claim 12, The storing step and the adding step, And a session management table index of the corresponding session obtained using the session identifier or the session identifier and the subsession identifier obtained from the charging server. 22. The method of claim 21, The storing step and the adding step, Obtaining an index of a corresponding session identifier from a table storing session identifier indices using a hash function of a session type of a string type, and obtaining an index of a session management table for a corresponding session using the obtained index of the corresponding session identifier. Billing management method characterized in that. The method of claim 12, The charging session management table, And an index for identifying the accounting session, access information of an access terminal, state information of the accounting session, and information of the accounting session. 24. The method of claim 23, The charging session management table, The billing management method further comprising mobile Internet protocol session index information.

Images