KR20100051890A - System and method for reporting an expiry of the limited fare - Google Patents

Abstract

PURPOSE: A system and a method for reporting expiry of a limited fee are provided to connect a mobile terminal to a limit-expired guiding and charging page without ending a packet call, thereby inducing charging of a pre-paid charge. CONSTITUTION: An authentication server(30) checks a limited fee of a subscriber through an SCP(Service Control Point)(50). If the authentication server reports limit expiration of the subscriber, a packet exchange(20) converts a destination internet protocol address of a packet call of a mobile terminal(10) into an IP address of a gateway for a non-charging service(70). The gateway for a non-charging service accesses an internet server(80) for providing a limit expiration guiding and charging page.

Description

Limitation expiration guidance service system and method {SYSTEM AND METHOD FOR REPORTING AN EXPIRY OF THE LIMITED FARE}

The present invention relates to a limit expiration guidance service system and method. In particular, when a prepaid fee limit of a mobile terminal attempting a packet call has expired, the mobile terminal can be automatically connected to the expiration guidance and charging page without disconnecting the call. It relates to a limit expiration guidance service system and method.

In a packet data network providing a packet data service to a mobile communication service subscriber, a prepaid service (PPS) refers to providing a communication service as much as a payment fee limit to a prepaid subscriber who has prepaid a data usage fee.

As described above, when the prepaid fee subscriber who paid the data usage fee in advance is connected to the packet data network and receives the packet data service, the limit of the prepaid fee expires and no longer provides the service. In conjunction with the VSMSS (Vertical SMS Server), an SMS message including an announcement indicating that the limit has expired is sent to the mobile terminal whose limit has expired. There is a method of informing the expiration of the limit by transmitting an SMS message including a URL leading to access to the expiration page.

However, the method of informing the expiration of the limit by sending an SMS message including the announcement to the mobile terminal simply informs the terminal user that the limit has expired. Attempting to access the packet data network again, the call is not permitted for the call of the subscriber expired, there is a problem that can not be connected to the limit management server.

On the other hand, the method of informing the expiration of the limit by sending an SMS message including the callback URL to the mobile terminal, the IP of the domain name of the callback URL (registered in the packet exchange in advance as a non-billing IP) and the mobile terminal callback When a connection is attempted using a URL, the mobile terminal connects to a charging guide page set to non-billing.

Here, the mobile terminal needs to go through the WAP gateway in order to access the non-billing charging guide page using the callback URL, and the mobile terminal whose limit has expired is required to be connected to the non-billing charging guide page through the WAP gateway. Must be set to the non-billing service IP.

However, if the IP of the WAP gateway through which all HTTP URLs pass through is set to a non-billing service IP, a problem arises in that all Internet WAP sites are billed.

As a result, the IP of the WAP gateway, which all HTTP URLs must pass through, cannot be set to the non-billing service IP.This causes the mobile terminal that has expired to be unable to access the WAP gateway even if the charging guidance page is provided as non-billing. There is a problem that can not be connected to the non-charge charging guide page.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. When the subscriber who attempts to call a packet is a prepaid subscriber having an expired limit, the packet switcher informs the destination of a packet received from the prepaid subscriber having the expired limit. And a limit expiration guidance service system and method for changing a gateway providing a recharge page so that a prepaid fee subscriber whose limit has expired can access a limit expiration guide and a recharge page that is processed as non-charge.

Limit expiration guidance service system according to an embodiment of the present invention for achieving the above object is a subscriber information management server for storing and managing subscriber information of a mobile communication service subscriber; When receiving billing data from the billing server, SCP (Service Control Point) for calculating the rate of the prepaid bill subscriber by subtracting and managing the prepaid bill of the prepaid bill subscriber; When the subscriber is confirmed as a prepaid fee subscriber, the subscriber information is provided by requesting the subscriber information management server to the subscriber information management server and checking the plan information included in the subscriber information. An authentication server for checking a limit fee; If the mobile terminal is requested to open a packet call, the authentication server requests authentication of the subscriber who has requested to open the packet call, and in response to the authentication request, the authentication server is notified that the limit of the subscriber has expired. A packet switch for changing the destination IP address of the packet call received from the terminal to the IP address of the non-billing service gateway found in the IP change table; When the mobile terminal is connected through the packet switch, it is preferable that the mobile terminal includes a gateway for a non-billing service for connecting the mobile terminal to an internet server providing a limit expiration guide and a charging page.

Further, when the authentication server receives an authentication request for the subscriber who requested the packet call establishment from the packet exchange requesting the packet call establishment, the authentication server requests the subscriber information for the subscriber to the subscriber information management server and then the subscriber of the subscriber. If the subscriber is provided as the prepaid fee subscriber after receiving the information and the non-billing service list and confirming the plan information included in the subscriber information, the subscriber confirms the limit fee of the subscriber through the SCP, and as a result When the limit is expired, when the subscriber authentication response is sent to the packet exchange, an index of the IP change table to be used for changing the destination address of the packet received from the mobile terminal along with the non-billing service list converted to the IP index is sent. It is preferable.

When the packet switch is requested to open a packet call from the mobile terminal, the packet switch requests the authentication server to authenticate the subscriber who requested the packet call establishment, and converts the IP index into a subscriber authentication response received from the authentication server. If the IP change table index is included with the non-billing service list, an IP address is allocated to the mobile terminal, included in the packet call establishment response, transmitted to the mobile terminal, and the IP address assigned to the mobile terminal is limited. If the packet is received from the mobile terminal after being managed with the expiration IP, the IP change table is searched for an IP address of the non-billing service gateway mapped to the destination IP address of the received packet. Change the destination IP address of the received packet to the IP address of the gateway for billing service. For example, when the packet is transmitted to the non-billing service gateway and a packet destined for the mobile terminal is received from the non-billing service gateway, a billing service mapped to the source IP address of the received packet in the IP change table. Preferably, the IP address of the gateway is searched, and the source IP address of the received packet is changed to the IP address of the found billing service gateway and transmitted to the mobile terminal.

The non-billing service gateway operates by receiving an IP address set for the non-billing service, and provides a limit expiration guide and a charging page when the mobile terminal requests an initial access page through the packet switch. It is desirable to request and receive a limit expiration guide and a charge page from the Internet server to transmit the information to the mobile terminal.

On the other hand, the limit expiration guidance service method according to an embodiment of the present invention, the process of requesting the authentication of the subscriber who requested the packet call establishment to the authentication server in the packet exchanger received a request to open a packet call from the mobile terminal; When the authentication server performs authentication for the subscriber and the subscriber is a prepaid fee subscriber and the limit has expired, the subscriber authentication response includes information indicating that the limit of the mobile terminal has expired. Transmitting; Performing a response to the packet call establishment request from the packet exchanger to the mobile terminal to open a packet call with the mobile terminal, and managing an IP address assigned to the mobile terminal for expiration of a limit when opening a packet call; ; When a packet is received from the mobile terminal that attempts to access the gateway using the gateway's IP address obtained through DNS, the packet switcher is mapped to the destination IP address of the packet in an IP change table. Searching for an IP address of a gateway for a service; Changing the destination IP address to an IP address of the searched non-billing service gateway, and then transmitting a packet whose destination IP address is changed to the non-billing service gateway; The non-billing service gateway preferably includes a process of requesting and receiving a limit expiration guide and a charge page from an internet server providing a limit expiration guide and a charge page, and transmitting the same to the mobile terminal.

According to the limit expiration guidance service system and method of the present invention, when a subscriber who attempts to call a packet is a prepaid fee subscriber and the limit expires, the packet exchange exchange receives a destination limit for the packet received from the prepaid fee subscriber that has expired. By changing to a gateway that provides a recharge page, the prepaid fee subscriber with an expired limit can access the Restriction Expiration Guide and Recharge page, which is treated as a non-billing charge, to induce prepaid charge recharging without terminating the packet call attempted by the subscriber. Will be.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the expiration guidance service system and method according to a preferred embodiment of the present invention.

1 is a diagram illustrating a configuration of a limit expiration guidance service system according to an embodiment of the present invention.

In FIG. 1, the mobile terminal 10 is a terminal capable of packet data communication through a packet data network, and requests a packet call establishment from the packet exchanger 20 to the packet exchanger 20 through the access network. Is received, it requests the IP address for the initial access page to the Domain Name Server (DNS) 60.

As described above, after requesting the IP address for the initial access page to the DNS (60), in response to receiving the IP address of the gateway 90 and the IP address of the Internet server 100 that provides the initial access page In order to request an initial access page, a packet having a gateway IP address as a destination IP address is transmitted to the packet switch 20.

Herein, the mobile terminal 10 may include a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a hand-held PC, a global system for mobile (GSM) phone, and wideband-W-CDMA. CDMA) phone, CDMA-2000 phone, Mobile Broad and System (MBS) phone and the like, the type can be determined according to the type of mobile communication system constituting the mobile communication network.

When the packet switch 20 receives a request for opening a packet call from the mobile terminal 10, the packet switch 20 requests a subscriber authentication to the authentication server 30 to confirm whether the subscriber using the mobile terminal 10 is a valid subscriber. In response to receiving the non-billing service list converted to the IP index from the authentication server 30 and the IP change table index to be used when processing the packet of the expired mobile terminal, after assigning the IP address to the mobile terminal 10 In addition, the IP address assigned to the mobile terminal 10 is included in the response to the packet call establishment request and transmitted to the mobile terminal 10 to establish a packet call with the mobile terminal 10.

As described above, the packet switch 20 that has established a packet call with the mobile terminal 10 manages the IP address assigned to the mobile terminal 10 for expiration of the limit when the packet call is established, and then the gateway for billing service. Upon receiving a packet from the mobile terminal 10 to access 90, it is checked whether the IP address of the mobile terminal 10 is managed for expiration, and the IP address of the mobile terminal 10 expires. Is not managed for the user, that is, if the limit of the mobile terminal 10 has not expired, the packet received from the mobile terminal 10 is transmitted to the billing service gateway 90, and the IP of the mobile terminal 10 is transmitted. If the address is being managed for limit expiry, i.e. if the limit of the mobile terminal 10 has expired, the IP change table may allow the mobile terminal 10 to access the limit expiration announcement and charging page. The non-billing service in which the IP address of the non-billing service gateway 70 mapped to the destination IP address of the packet received from the terminal 10 is retrieved, and the destination IP address of the packet received from the mobile terminal 10 is retrieved. After changing the IP address of the gateway 70, the packet whose destination IP address is changed is transmitted to the non-billing service gateway 70.

When receiving a packet destined for the mobile terminal 10 whose IP address is managed for expiration of the limit from the non-billing service gateway 70, the mobile terminal attempting to connect to the billing service gateway 90 ( 10), the IP address of the billing service gateway 90 mapped to the source IP address of the packet received from the billing service gateway 70 in the IP change table so as not to be mistaken, and the gateway for billing service After changing the source IP address of the packet received from 70 to the IP address of the searched gateway 90 for charging service, the packet with the changed source IP address is transmitted to the mobile terminal 10.

Here, the packet switch 20 may be an access point, a packet data serving node (PDSN), a gateway GPRS support node (GGSN), an IP multimedia subsystem (IMS), or the like.

When the authentication server (Authentication, Authorization, Accounting: AAA) 30 receives a subscriber authentication request from the packet switch 20, it requests the subscriber information for the subscriber to the subscriber information management server 40, and then the subscriber information request for the subscriber information request. In response, the subscriber information management server 40 receives the subscriber information and the non-billing service list of the corresponding subscriber.

In addition, the authentication server 30 analyzes the plan information included in the subscriber information provided from the subscriber information management server 40, and when the corresponding subscriber is identified as a prepaid fee subscriber, in conjunction with SCP 50, the limit of the corresponding subscriber After checking the rate and checking the limit rate of the subscriber, if it is determined that the limit of the subscriber has expired, convert the non-billing service list into an IP index that can be processed by the packet switch 20, and then the IP index The non-billing service list, which has been converted into, and the IP change table index to be used when processing the packet of the mobile terminal whose limit has expired are included in the response to the subscriber authentication request, and transmitted to the packet exchanger 20.

On the other hand, the subscriber information management server 40 is a server that stores and manages subscriber information of mobile communication service subscribers, and subscriber information of each subscriber includes plan information (postpaid or prepaid) of the corresponding subscriber.

As described above, when the subscriber information management server 40 receives the subscriber information of a specific subscriber from the authentication server 30, the subscriber information management server 40 searches for the subscriber information of the corresponding subscriber by using the identification information of the corresponding subscriber, and is included in the retrieved subscriber information. When the subscriber checks the plan information and confirms that the subscriber is a prepaid fee subscriber, the subscriber information is transmitted to the authentication server 30 including the non-billing service list together with the retrieved subscriber information in response to the subscriber information request.

The above-mentioned non-billing service list preferably includes the IP address of the non-billing service gateway 70 set for the non-billing service.

On the other hand, SCP (Service Control Point) (50), when receiving the billing data from the billing server (not shown), calculates the rate of the prepaid rate subscriber and manages by subtracting the prepaid rate of the prepaid rate subscriber.

As described above, when the SCP 50 receives a specific subscriber's limit fee from the authentication server 30, the SCP 50 retrieves the subscriber's limit fee using the subscriber's identification information, but the subscriber's limit fee has not expired. Provides the limit fee of the subscriber to the authentication server 30, and informs that the limit fee of the subscriber is expired to the authentication server 30 when the limit fee of the subscriber has expired.

DNS 60 is a server responsible for translating a host or domain name into an IP address. When the mobile terminal 10 accesses and requests an IP address for an initial access page, the DNS 60 requests the initial terminal. The IP address of the Internet server 100 providing the access page and the IP address of the gateway 90 to be accessed to access the Internet server 100 are transmitted to the mobile terminal 10.

On the other hand, the gateway basically serves to connect two different types of network between the wireless Internet using the WAP protocol and the wired Internet using the HTTP protocol, in the embodiment of the present invention shown in FIG. As described above, the billing service gateway 90 and the billing service gateway 70 are separately implemented to allocate the billing service gateway 90 to an IP address set for billing service, and the billing service gateway ( Assign an IP address set for the non-billing service.

In this case, when the mobile terminal 10 accesses and requests an initial access page, the billing service gateway 90 requests an initial access page to the Internet server 100 that provides the initial access page requested by the mobile terminal 10. After receiving, the initial access page provided from the Internet server 100 is transmitted to the mobile terminal 10.

When the mobile terminal 10 accesses the initial access page and requests the initial access page, the non-billing service gateway 70 determines that the mobile terminal 10 has expired and provides a limit expiration guide and a charging page. After requesting and receiving a limit expiration guide and a charge page from the server 80, the limit expiration guide and a charge page provided from the Internet server 80 are transmitted to the mobile terminal 10.

In addition, in another embodiment of the present invention, all of the IP addresses set for the billing service and the IP address set for the non-billing service are allocated to one gateway, and the mobile terminal 10 receives the IP address set for the billing service. After the connection, the initial access page is requested, and receives the initial access page to the Internet server 100 that provides the initial access page received and transmitted to the mobile terminal 10, the mobile terminal 10 is non- After connecting using the IP address set for the billing service and requesting an initial access page, the mobile terminal 10 determines that the limit has expired and limits the limit to the Internet server 80 that provides a limit expiration guide and a charging page. Request the expiration guide and the charging page is received and transmitted to the mobile terminal 10.

2 is a road showing an example of an IP change table applied to the present invention, the packet exchanger 20 is intended to access the gateway 90 for billing service to receive the billing service for the mobile terminal 10 whose limit has expired. The packet received from the mobile terminal 10 and the limit expires so that the mobile terminal 10 whose limit has expired can be connected to the Internet server 80 which provides the limit expiration guide and charging page. The Internet server 80 providing the guide and the charging page is transmitted to the gateway 70 for non-billing service that interconnects.

To this end, the packet switch 20 has an unpaid charge to be changed for each destination IP address so that the destination IP address of the packet received from the mobile terminal 10 whose limit has expired can be changed to the IP address of the gateway 70 for non-billing service. The IP change table in which the IP addresses of the gateways for services are mapped is mounted.

3 is a flowchart illustrating a limit expiration guide service method according to an embodiment of the present invention.

First, when the mobile terminal 10 requests to open a packet call (S10), the packet switch 20 that has been requested to open a packet call determines an authentication server to confirm whether the subscriber using the mobile terminal 10 is a legitimate subscriber. Request for subscriber authentication to 30 (S12).

In the process S12, when the packet exchanger 20 requests subscriber authentication to the authentication server 30, the packet switch 20 transmits identification information of the subscriber using the mobile terminal 10 that requests the establishment of a packet call and requests subscriber authentication.

The authentication server 30 that has received the subscriber authentication request from the packet exchanger 20 through the process S12 requests the subscriber information of the corresponding subscriber to the subscriber information management server 40 using the subscriber identification information (S14).

The subscriber information management server 40, which has received the subscriber information from the authentication server 30 through the process S14, retrieves the subscriber information of the corresponding subscriber using the subscriber identification information (S16), and is included in the retrieved subscriber information. If the corresponding subscriber is confirmed as a prepaid fee subscriber (S18), the subscriber information retrieved in step S16 and the non-billing service list are transmitted to the authentication server 30 in response to the subscriber information request (S18). S20).

The authentication server 30, which has received the subscriber information from the subscriber information management server 40 through the above process S20, checks the plan information included in the subscriber information and confirms that the subscriber is a prepaid fee subscriber (S22). In step 50, the subscriber requests a limit fee of the corresponding subscriber (S24).

Upon receiving the request for the limit fee of a particular subscriber from the authentication server 30 through the process S24 described above, the SCP 50 searches for the limit fee of the corresponding subscriber and confirms that the limit fee of the corresponding subscriber has expired. In response to the limit fee request, the subscriber is notified that the limit fee has expired (S26).

The authentication server 30, which has been informed that the subscriber is the subscriber whose limit fee has expired through SCP S50 through the above process S26, accesses the limit expiration guide and charging page where the mobile terminal 10 is charged for the prepaid fee. The index of the IP change table to be used when processing the packet of the mobile terminal 10 is included in the subscriber authentication response so as to charge the packet to the packet switch 20 (S28).

In step S28, the authentication server 30 sends both an IP change table index to be used when processing the packet of the mobile terminal 10 and a non-billing service list converted into an IP index that can be processed by the packet switch 20.

After receiving the subscriber authentication response from the authentication server 30 through the process S28, the packet exchanger 20 allocates the IP address of the mobile terminal 10, and then sends the packet address to the IP address assigned to the mobile terminal 10. It is included in the establishment response and transmitted to the mobile terminal 10 (S30).

The packet exchanger 20 that has responded to the request for opening a packet call to the mobile terminal 10 through the process S30 manages the IP address assigned to the mobile terminal 10 as an IP address for limit expiration.

Meanwhile, the mobile terminal 10 receiving the packet call establishment response from the packet exchanger through the process S30 requests the IP address for the initial access page to the DNS 60 (S32).

The DNS server 60 having received the IP address for the initial access page from the mobile terminal 10 through the process S32 is an Internet server for which the mobile terminal 10 provides the initial access page through the billing service gateway 90. The IP address of the gateway 90 for billing service and the IP address of the Internet server 100 providing the initial access page are included in the IP address response so as to be connected to the mobile station 10 (S34). .

The mobile terminal 10 receiving the IP address of the gateway 90 for the billing service and the IP address of the Internet server 100 providing the initial access page from the DNS 60 through the process S34 is a gateway for the billing service ( In order to request the initial access page, the IP address of the gateway 90 for the billing service is transmitted to the packet switch 20 (for example, 111.111.111.222) (S36).

After receiving the packet from the mobile terminal 10 through the process S36, the packet switch 20 confirms whether the IP address of the mobile terminal 10 is managed for expiration of the limit, and then the IP address of the mobile terminal 10. Is managed for limit expiration, from the mobile terminal 10 to connect the mobile terminal 10 to the Internet server 80 which provides limit expiration guidance and charging pages through the non-billing service gateway 70. Gateway IP address for non-billing services (for example, 111.111) mapped to a destination IP address (for example, 111.111.111.222) in the IP change table with the destination IP address of the received packet (for example, 111.111.111.222). 111.444) (S38).

Subsequently, the destination IP address of the packet received from the mobile terminal 10 is changed to the non-billing service gateway IP address (for example, 111.111.111.444) retrieved through the process S38 (S40), and the non-billing service. A request for an initial access page is transmitted by transmitting a packet whose destination IP address is changed to the gateway IP address (for example, 111.111.111.444) to the non-billing service gateway 70 (S42).

Since the gateway IP address for the non-billing service is included in the non-billing service list in step S42, the packet exchanger 20 changes the packet for which the destination IP address is changed to the gateway IP address for the non-billing service. Is allowed to be sent).

The non-billing service gateway 70, which has received the initial access page request from the mobile terminal 10 through the process S42, determines the subscriber of the mobile terminal 10 as an expired subscriber and limits the mobile terminal 10. In order to access the expiration guide and the charge page, the Internet server 80 providing the limit expiration guide and the charge page is requested by the limit expiration guide and the charge page is provided (S44, S46), received from the Internet server 80 In order to transmit the limit expiration guide and the charging page to the mobile terminal 10, a packet having the destination as the mobile terminal 10 is transmitted to the packet switch 20 (S48).

Receiving the packet from the non-billing service gateway 70 to the mobile terminal 10 through the process S48 described above, the packet switch 20 manages the IP address of the mobile terminal 10 as the destination for the expiration of the limit. If the IP address of the mobile terminal 10 is managed for the expiration of the limit after checking whether the mobile terminal 10 has been used for the expiration of the limit, in order to prevent the mobile terminal 10 that requested the initial access page from the gateway 90 for billing service from causing an error, The gateway IP address for billing service mapped to the source IP address (eg 111.111.111.444) in the IP change table to the source IP address (eg 111.111.111.444) of the packet received from the gateway for service 70. (Eg, 111.111.111.222) is searched (S50).

Subsequently, the packet exchanger 20 changes the source IP address of the packet received from the non-billing service gateway 70 to the gateway service IP address (for example, 111.111.111.222) retrieved through the process S50. (S52), and transmits the packet whose source IP address is changed to the gateway IP address for charging service (for example, 111.111.111.222) to the mobile terminal 10 to provide a limit expiration guide and a charging page to the mobile terminal 10. (S54).

Through the above-described series of procedures, the mobile terminal 10 connected to the limit expiration guide and the charging page may charge the prepaid fee.

The limit expiration guidance service system and method of the present invention are not limited to the above-described embodiments, and may be variously modified and implemented within the scope of the technical idea of the present invention.

The limit expiration guidance service system and method according to the present invention, when the prepaid fee subscriber who has expired attempts a packet call, induces charging by connecting the mobile terminal to the limit expiration guidance and charging page without terminating the packet call. Enable packet data services.

1 is a view showing the configuration of a limit expiration guidance service system according to an embodiment of the present invention by way of example.

2 is a diagram illustrating an IP change table applied to the present invention by way of example.

3 is a process for explaining a limit expiration guidance service method according to an embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10. mobile terminal, 20. packet switch, 30. authentication server,

40. Subscriber Information Management Server, 50. SCP, 60. DNS,

70. Gateway for non-billing service, 80, 100. Internet server,

90. Gateway for Billing Service

Claims (10)

In the limit expiration guidance service system, A subscriber information management server for storing and managing subscriber information of a mobile communication service subscriber; When receiving billing data from the billing server, SCP (Service Control Point) for calculating the rate of the prepaid bill subscriber by subtracting and managing the prepaid bill of the prepaid bill subscriber; When the subscriber is confirmed as a prepaid fee subscriber, the subscriber information is provided by requesting the subscriber information management server to the subscriber information management server and checking the plan information included in the subscriber information. An authentication server for checking a limit fee; If the mobile terminal is requested to open a packet call, the authentication server requests authentication of the subscriber who has requested to open the packet call, and in response to the authentication request, the authentication server is notified that the limit of the subscriber has expired. A packet switch for changing the destination IP address of the packet call received from the terminal to the IP address of the non-billing service gateway found in the IP change table; And a non-billing service gateway that connects the mobile terminal to an internet server providing a limit expiration guide and a charging page when the mobile terminal is connected through the packet switch. The method of claim 1, wherein the authentication server, Upon receiving a request for authentication of a subscriber who has requested to open a packet call from the packet exchange that has been requested to open a packet call, the subscriber information management server requests subscriber information about the subscriber to obtain subscriber information and a non-billing service list of the subscriber. If the subscriber is confirmed to be a prepaid fee subscriber after checking the plan information included in the subscriber information, and confirming the subscriber's limit fee through the SCP, if the subscriber's limit has expired, When the subscriber authentication response is sent to the packet switch, the limit expiration guide includes an index of the IP change table to be used to change the destination address of the packet received from the mobile terminal together with the non-billing service list converted into the IP index. Service system. The billing service list of claim 2, wherein Limit expiration guidance service system comprising the IP address of the non-billing service gateway. The method of claim 1, wherein the packet exchanger, Upon receiving a request for opening a packet call from a mobile terminal, the authentication server requests authentication of the subscriber who requested the packet call establishment, and the IP with the non-billing service list converted into an IP index in the subscriber authentication response received from the authentication server. If a change table index is included, the mobile station assigns an IP address to the mobile terminal, includes it in the packet call establishment response, and transmits it to the mobile terminal. The IP address assigned to the mobile terminal is managed as an expiration IP. When a packet is received from the mobile terminal, the IP change table is searched for an IP address of a non-billing service gateway mapped to a destination IP address of the received packet, and the IP address of the found non-billing service gateway is searched. Change the destination IP address of the received packet to When receiving a packet destined for the mobile terminal from the gateway for non-billing service, the IP address of the gateway for billing service mapped to the source IP address of the received packet in the IP change table is transmitted. Search for and change the source IP address of the received packet to the IP address of the found gateway for billing service and transmit it to the mobile terminal. According to claim 1, The non-billing service gateway, When the mobile terminal connects through the packet switch and requests an initial access page, it operates with an IP address set for the non-billing service. Limit expiration guidance service system characterized in that the request is received and transmitted to the mobile terminal. Upon receiving a request for opening a packet call from a mobile terminal, request authentication of a subscriber who has requested to open the packet call to an authentication server, and change the IP with a non-billing service list converted into an IP index in a subscriber authentication response received from the authentication server. If a table index is included, a packet call is established with the mobile terminal by responding to a packet call opening request to the mobile terminal, and when the packet call is opened, the IP address assigned to the mobile terminal is used as the limit expiration IP. If the packet is received from the mobile terminal after the management, the IP address of the non-billing service gateway mapped to the destination IP address of the packet is retrieved from the IP change table, and the IP of the found non-billing service gateway is searched. Change the destination IP address to an address for the billing service gateway And when receiving a packet destined for the mobile terminal from the non-billing service gateway, retrieves an IP address of the billing service gateway mapped to the source IP address of the packet in the IP change table, and retrieves the IP address. And changing the source IP address to an IP address of a gateway for billing service and transmitting the changed source IP address to the mobile terminal. Upon receiving a request for authentication of a subscriber who has requested to open a packet call from a packet exchange that is requested to open a packet call from a mobile terminal, the subscriber information management server which manages subscriber information is requested, and the subscriber information request is requested. In response to receiving the subscriber's subscriber information and the non-billing service list, if the subscriber is confirmed to be a prepaid fee subscriber by checking the plan information included in the subscriber information, the subscriber manages the prepaid fee of the prepaid fee subscriber. When requesting the subscriber's limit fee, and in response to being informed by the SCP that the subscriber's limit has expired, convert the non-billing service list into an IP index and then change the non-billing service list converted into an IP index. Include in subscriber authentication response with table index To the authentication server, it characterized in that for transmitting to the packet exchange. When an IP address set for non-billing service is assigned and operated, a mobile terminal opened with a packet call accesses and requests an initial access page, and determines that the mobile terminal is an expired mobile terminal. Gateway, characterized in that for requesting the expiration guidance and charge page to the Internet server providing the received and transmitted to the mobile terminal. In the limit expiration guidance service method, Requesting authentication of a subscriber who has requested to open a packet call to an authentication server at a packet switch that is requested to open a packet call from a mobile terminal; If the subscriber is a prepaid fee subscriber and the limit expires as a result of the authentication of the subscriber by the authentication server, the subscriber authentication response includes information indicating that the limit of the mobile terminal has expired and is transmitted to the packet switch. Process; Performing a response to the packet call establishment request from the packet exchanger to the mobile terminal to open a packet call with the mobile terminal, and managing an IP address assigned to the mobile terminal for expiration of a limit when opening a packet call; ; When a packet is received from the mobile terminal that attempts to access the gateway using the gateway's IP address obtained through DNS, the packet switcher is mapped to the destination IP address of the packet in an IP change table. Searching for an IP address of a gateway for a service; Changing the destination IP address to an IP address of the searched non-billing service gateway, and then transmitting a packet whose destination IP address is changed to the non-billing service gateway; Limit expiration guidance service comprising the step of requesting and receiving the limit expiration guidance and charging page from the gateway for the non-billing service to provide a limit expiration guidance and charging page to the mobile terminal; Way. 10. The billing service gateway of claim 9, wherein when the packet exchange receives a packet destined for the mobile terminal from the non-billing service gateway, the packet switching gateway is mapped to a source IP address of the packet in the IP change table. Retrieving an IP address; And changing the source IP address to the IP address of the searched billing service gateway, and then transmitting the packet whose source IP address is changed to the mobile terminal.

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