KR101466217B1 - System and method for reporting an expiry of the limited fare - Google Patents

Abstract

The present invention relates to a limit expiration guidance service system and method for enabling a mobile terminal to be automatically connected to a limit expiration guidance and a charging page without cutting a call when the prepaid limit of the mobile terminal attempting to make a packet has expired .

To this end, according to the present invention, when a subscriber of a mobile terminal requesting a packet call is a prepaid subscriber and the limit expires, the IP address of the Internet server providing the limit expiration information and the charging page is set for the non-billing service It is desirable to provide the gateway IP address so that it can be connected to the limit expiration guide and the charging page via the gateway set for the non-charging service.

Accordingly, when a subscriber attempting to make a packet call is a prepaid subscriber and the limit expires, the mobile terminal is connected to the limit expiration guide and the charging page without ending the packet call attempted by the subscriber, thereby inducing charging of the prepaid charge .

Prepay rate subscribers, expiration limits, DNS, gateways, limit expiration instructions, and charges page

Description

TECHNICAL FIELD [0001] The present invention relates to a system and method for expiring a limit,

The present invention relates to a system and method for expiration expiration guidance service, and more particularly, to a system and method for expiration expiration guidance service, in which a mobile terminal can be automatically connected to a limit expiration information and a charging page To an expiration guidance service system and method.

In a packet data network providing packet data service to a subscriber of a mobile communication service, a prepaid service (PPS) is a service providing a communication service to a prepaid subscriber who has paid a data usage fee in advance.

As described above, when the prepaid rate subscriber who paid the data usage fee in advance is connected to the packet data network and is provided with the packet data service, the limit of the prepaid rate expires and the service is no longer provided. A method of intercepting a limit expiration by transmitting an SMS message including a notice informing that a limit has expired to a mobile terminal whose limit has expired in conjunction with a VSMSS (Vertical SMS Server) A URL for leading a connection to a page that guides expiration), to guide the expiration of the limit.

However, the method of transmitting the SMS message including the announcement message to the mobile terminal and guiding the limit expiration notifies the terminal user that the limit is simply expired, and the terminal user recognizing the limit expiration It tries to reconnect to the packet data network. However, since the connection is not permitted to the call of the subscriber whose expiration date has expired, the connection to the limit management server becomes impossible.

The method of transmitting the SMS message including the callback URL to the mobile terminal and guiding the expiration of the limit is to register the IP of the domain name of the callback URL with the packet switch in advance in the packet switch, When a connection is attempted using a URL, the mobile terminal is connected to a charging guide page set to be non-charging.

Here, in order for the mobile terminal to access the non-charging charging guidance page using the callback URL, the WAP gateway must pass through the WAP gateway. In order for the mobile terminal whose expiration date has expired to access the non-charging charging guidance page via the WAP gateway, Must be set to non-billing service IP.

However, if the IP of the WAP gateway to which all HTTP URLs should pass is set as the non-charging service IP, all Internet WAP sites will be subjected to non-charging processing.

As a result, the IP of the WAP gateway to which all HTTP URLs should pass can not be set to the non-charging service IP, and even if the charging guide page is provided in a non-charging manner, the mobile terminal whose expiration date has expired can not access the WAP gateway There is a problem that it is impossible to connect to the non-charging charge guidance page.

SUMMARY OF THE INVENTION The present invention is conceived to solve the above-described problems, and it is an object of the present invention to provide a mobile terminal that can access a non-billing charge guidance page through a gateway designated for a non-billing service when a subscriber attempting a packet call is a prepaid charge subscriber whose expiration date has expired And to provide a limit expiration guidance service system and method.

According to another aspect of the present invention, there is provided a limit expiration guidance service system, wherein when a subscriber requesting establishment of a packet call is requested to be authenticated, if the subscriber is identified as a prepaid subscriber, An authentication server for confirming a limit fee of the subscriber; When receiving a request for opening a packet call from the mobile terminal, requests authentication of the subscriber to the authentication server and receives a DNS IP address set for the non-charging service in response to the authentication request, A packet switch for requesting deletion of a local cache upon transmission; When receiving an IP address from the access terminal using the DNS IP address, the gateway transmits an IP address of the Internet server providing the limit expiration information and the charge page to the mobile terminal, together with the gateway IP address set for the non-billing service The mobile terminal deletes the IP address stored in the local cache according to the local cache deletion request and then uses the gateway IP address set for the non-accounting service It is preferable to connect to an Internet server that provides a limit expiration guide and a charging page through the connected gateway.

Further, when the authentication server receives a request for authentication of a subscriber requesting the establishment of the packet call from the packet switch that is requested to open a packet call, the authentication server requests subscriber information to a subscriber information management server that manages subscriber information, If the subscriber is confirmed as a prepaid subscriber as a result of checking the subscriber information and the non-subscription service list and checking the subscription information included in the subscriber information, the subscriber's limit charge And transmits a subscriber authentication response including the DNS IP address set for the non-billing service together with the non-billing service list converted into the IP index when the subscriber's authentication response is sent to the packet switch, when the subscriber's limit has expired desirable.

When the packet switch is requested to open the packet call, the packet switch requests the authentication server for the subscriber requesting the opening of the packet call. In response to the authentication request, the packet switch exchanges a DNS IP Receiving the non-billing service list converted from the address and the IP index, transmits a response to the request for opening a packet call to the mobile terminal, including a local cache deletion request together with a DNS IP address set for the non-billing service, It is preferable that the packet is passed only when the destination of transmission of the packet flowing through the packet call established between the mobile terminal and the destination address belongs to the IP list in the IP index.

In addition, the DNS operates by being assigned a DNS IP address set for the billing service and a DNS IP address set for the non-billing service. After the mobile terminal accesses the DNS using the DNS IP address set for the billing service, In response to the request for the IP address for the initial access page, the IP address of the gateway set for the billing service is provided together with the IP address of the Internet server set for the billing service, When an IP address for the initial access page is requested after accessing using the set DNS IP address, the IP address of the Internet server providing the limit expiration information and the charging page is transmitted in response to the IP address of the gateway set for the non- It is desirable to provide an IP address.

Also, the DNS is separately implemented to be used for the non-billing service process, and is operated by receiving only the DNS IP address set for the non-billing service. When the mobile terminal accesses and requests an IP address for the initial access page, It is preferable to provide the IP address of the Internet server providing the limit expiration information and the charging page in response to the IP address of the gateway set for the non-charging service.

The gateway is operated by being assigned with a gateway IP address set for the billing service and a gateway IP address set for the non-billing service. After the mobile terminal accesses the gateway using the gateway IP address set for the billing service, When an initial access page is requested, the initial access page is requested and provided to the Internet server providing the initial access page, and the initial access page is transmitted to the mobile terminal. When the mobile terminal uses the gateway IP address set for the non- Upon requesting the initial access page, the terminal requests the limit expiration information and the charging page to the Internet server providing the limit expiration information and the charging page, and transmits the request to the mobile terminal.

Also, the gateway is separately implemented to be used for the non-billing service process, and is operated by receiving only the gateway IP address set for the non-billing service. When the mobile terminal accesses and requests the initial access page, It is preferable that the Internet server providing the charging page requests the limit expiration guide and the charging page and transmits the request to the mobile terminal.

According to another aspect of the present invention, there is provided a limit expiration guidance service method, comprising: requesting authentication of a subscriber requesting opening of a packet call to an authentication server in a packet switched telephone network in which a packet call is requested from a mobile terminal; If the subscriber is a prepaid subscriber whose expiration date has expired as a result of performing authentication with the subscriber at the authentication server, transmitting the subscriber authentication response including the DNS IP address set for the non-billing service to the packet switch; Including a DNS IP address and a local cache deletion request in a packet call establishment response in the packet switch; Upon deletion of the IP address stored in the local cache in response to the local cache deletion request, the mobile terminal accesses the DNS with the DNS IP address and requests an IP address. Then, the DNS issues a limit expiration information and a charging page Providing a gateway IP address set for a non-charging service together with an IP address of an Internet server; And accessing the Internet server providing the limit expiration information and the charging page through the gateway connected to the mobile terminal by using the gateway IP address set for the non-billing service.

According to the limit expiration guidance service system and method of the present invention, when a subscriber attempting a packet call is a prepaid subscriber and the limit expires, the mobile terminal does not terminate the packet call attempted by the subscriber, So that it is possible to induce charging of prepaid charges.

Alternatively, the gateway may be provided with a gateway to which an IP address set for a non-billing service can be handled by the packet switcher separately, or an IP address set for the non-billing service may be allocated to the gateway together with an IP address set for the billing service , The mobile terminal can access the limit expiration guidance and charging page, which is processed in a non-charging manner through a gateway that can be handled by the packet exchanger and non-charging.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a system and method for expiring a limit expiration service according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

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

1, a mobile terminal 10 is a terminal capable of packet data communication through a packet data network. After requesting establishment of a packet call, the mobile terminal 10 receives a DNS (Domain Name Server) IP address And receives a packet call establishment response including a local cache deletion request, deletes the IP address stored in the local cache according to the local cache deletion request.

As described above, when the IP address stored in the local cache is deleted according to the local cache deletion request, the IP address stored in the local cache is lost. Therefore, the mobile terminal 10 includes the packet call establishment response And accesses the DNS 60 for the non-accounting service using the DNS IP address set for the non-accounting service, and then requests the IP address of the initial access page to the DNS 60 for the non-accounting service.

As described above, after requesting the IP address for the initial access page by the DNS 60 for the non-billing service, an Internet server (not shown) providing the gateway IP address and the limit expiration information and the charge page set for the non- The mobile terminal 10 is connected to the gateway 80 for the non-charging service by using the gateway IP address set for the non-charging service provided from the DNS 60 for the non-charging service After the connection, the non-charging service gateway 80 requests the initial access page, and the non-charging service gateway 80 receives the limit expiration information and the charging page in response to the initial access page request.

Here, the mobile terminal 10 may be a PDA (Personal Digital Assistant), a cellular phone, a PCS (Personal Communication Service) phone, a hand-held PC, a Global System for Mobile (GSM) CDMA) phone, a CDMA-2000 phone, a Mobile Broad and System (MBS) phone, and the like, and the type thereof can be determined according to the type of a mobile communication system constituting a mobile communication network.

Meanwhile, when the packet switch 20 receives a request for opening a packet call from the mobile terminal 10, the packet switch 20 requests the authentication server 30 to perform subscriber authentication to check whether the subscriber using the mobile terminal 10 is a legitimate subscriber, In response to this, when receiving the non-charging service list converted from the authentication server 30 into the IP index and the DNS IP address set for the non-charging service in response thereto, after assigning the IP address of the mobile terminal 10, To the mobile terminal 10 in response to the request for opening the packet call. Since the mobile terminal 10 has expired the limit, the local IP address and the local cache are deleted together with the DNS IP address set for the non- And transmits the request to the mobile terminal 10.

As described above, in response to the subscriber authentication request, the packet switch 20, which has received the DNS IP address set for the non-charging service from the authentication server 30, The reason why the cache deletion request is included and transmitted is that the mobile terminal 10 inquires the IP address of the initial access page with the DNS 60 that is set for the non-billing service unconditionally regardless of the time-to-live (TTL) The IP address of the gateway 80 for the non-charging service and the IP address of the Internet server 100 set for the non-charging service are received.

In more detail, the DNS notifies the IP address to the mobile terminal 10 according to the request of the mobile terminal 10, and informs the lifetime of the corresponding IP address called TTL. If the lifetime does not expire , The mobile terminal 10 does not inquire the IP address by the DNS but requests the service using the IP address previously recognized.

Accordingly, if the mobile terminal 10 transmits the packet call establishment response transmitted to the mobile terminal 10 whose limit has expired without including the local cache deletion request, the mobile terminal 10 transmits the IP address stored in the local cache Only when the destination IP address is included in the non-charging service list among the packets received from the mobile terminal 10 whose expiration date has expired, the packet is transmitted to the gateway 90 for billing service as it is And the connection to the gateway 90 is blocked by the packet exchanger 20 that does not permit the other packets to pass through.

However, if the mobile terminal 10 deletes the IP address stored in the local cache and transmits the packet call establishment response including the local cache deletion request to the mobile terminal 10 that has expired the limit, Since there is no IP address stored in the cache, the IP address for the initial access page is requested by the DNS 60 for the non-billing service using the DNS IP for the non-billing service included in the packet call establishment response unconditionally. The IP address of the gateway 80 for the non-charging service and the IP address of the internet server 100 set for the non-charging service are received from the DNS 60 for the non-charging service and the gateway 80 ) To the Internet server 100 providing the limit expiration information and the charging page, and receives the limit expiration information and the charging page.

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

Upon receiving a subscriber authentication request from the packet switch 20, the authentication server 30 requests the subscriber information management server 40 for subscriber information about the subscriber, In response, the subscriber information management server 40 receives subscriber information of the subscriber and a non-billing service list.

The authentication server 30 analyzes the rate information included in the subscriber information provided from the subscriber information management server 40 and, when the subscriber is identified as a prepaid subscriber, the authentication server 30 transmits the limit of the subscriber in cooperation with the SCP 50 When it is determined that the subscriber's limit has expired as a result of checking the subscriber's limit fee, the non-subscription service list is converted into an IP index that can be processed by the packet switch 20, Charging service list and the DNS IP address set for the non-charging service in the response to the subscriber authentication request to the packet switching center 20.

On the other hand, the subscriber information management server 40 stores and manages subscriber information of a mobile communication service subscriber. Subscriber information of each subscriber includes fee information of the subscriber (postpaid plan, prepaid plan).

When the subscriber information management server 40 receives the subscriber information of the specific subscriber from the authentication server 30, the subscriber information management server 40 searches the subscriber information of the subscriber using the identification information of the subscriber, If the subscriber is confirmed as a prepaid subscriber, the subscriber information including the subscriber information searched in the subscriber information request is included in the response to the subscriber information request and transmitted to the authentication server 30.

It is preferable that the above-mentioned non-billing service list includes the gateway IP address set for the non-billing service.

Upon receipt of the billing data from the billing server (not shown), the SCP 50 calculates the rate of the prepaid billing subscriber and deducts and prepares the prepaid billing rate of the prepaid billing member.

When the SCP 50 receives a request for the limit fee of a specific subscriber from the authentication server 30, the SCP 50 searches the limit fee of the subscriber using the identification information of the subscriber, and if the limit fee of the subscriber does not expire Provides the subscriber's limit to the authentication server 30 and notifies the authentication server 30 that the subscriber's limit has expired when the subscriber's limit has expired.

The DNS (Domain Name Server) is a server for converting the name of a host or a domain into an IP address. In the embodiment of the present invention, as shown in FIG. 1, the DNS 70 for charging service and the non- A DNS server 60 for the non-billing service is allocated to the DNS 70 for the billing service and a DNS IP address for the billing service is assigned to the DNS 60 for the non- Assign an address.

Here, the DNS 70 for the billing service, which is assigned the DNS IP address set for the billing service, accesses the initial access page requested by the mobile terminal 10 when the mobile terminal 10 accesses and requests the IP address of the initial access page, To the mobile terminal 10, the IP address of the Internet server 110 providing the Internet service and the IP address of the charging service gateway 90 to be connected to the Internet server 110.

When the mobile terminal 10 accesses the DNS 60 for the non-charging service and requests the IP address of the initial access page, the DNS 60 for the non-charging service, which has been assigned the DNS IP address set for the non-charging service, It is determined that the limit has expired and the IP address of the Internet server 100 providing the limit expiration information and the charging page so that the mobile terminal 10 can charge up the prepaid fee, And transmits the IP address of the gateway 80 for the non-billing service to the mobile terminal 10.

Here, the Internet server 110 providing the initial access page requested by the mobile terminal 10 is an Internet server set for the billing service, and the Internet server 100 providing the limit expiration information and the charging page is provided for the non- It is the Internet server that is set up.

In another embodiment of the present invention, the DNS IP address set for the billing service and the DNS IP address set for the non-billing service are all assigned in one DNS, and the mobile terminal 10 is operated by the DNS When an IP address of the initial access page is requested after accessing using the IP address, it is determined that the limit of the corresponding mobile terminal 10 has not expired, and an Internet server The mobile terminal 10 transmits the IP address of the initial access page 110 and the IP address of the gateway 90 for the billing service. After the mobile terminal 10 connects using the DNS IP address set for the non-billing service, The mobile terminal 10 determines that the limit of the corresponding mobile terminal 10 has expired and transmits the limit expiration information and the charging page to the corresponding mobile terminal 10. [ And transmits the IP address of the Internet server 100 and the IP address of the gateway 80 for the non-charging service providing the limit expiration information and the charging page to the terminal 10.

2 is a diagram illustrating an IP address conversion table according to an embodiment of the present invention. When the DNS 70 is divided into a DNS 70 for a billing service and a DNS 60 for a non-billing service, An IP address conversion table in which an IP address of the gateway 90 is mapped to the Internet server 110 set for a billing service for each host or each domain is mounted in the DNS 60 for non-billing service an IP address conversion table in which an IP address of the gateway 80 and an Internet server 100 set for a non-charging service for each host or a domain are mapped is loaded as shown in FIG. The IP address of the internet server 110 and the gateway 90 set for the charging service by the host or the domain and the IP address of the gateway 90 are set for the non-charging service as shown in (c)An IP address conversion table in which the IP addresses of the Internet server 100 and the gateway 80 are respectively mapped is loaded.

The gateway basically connects two different types of networks between a wireless Internet using a WAP protocol and a wired Internet using an HTTP protocol. In the embodiment of the present invention, The gateway 90 for the billing service and the gateway 80 for the non-billing service are separately implemented to assign the gateway IP address set for the billing service to the gateway 90 for the billing service, And assigns a gateway IP address set for the non-billing service to the gateway 80.

Here, when the mobile terminal 10 accesses and requests the initial access page, the gateway 90 for the charging service, which has been assigned the gateway IP address set for the charging service, transmits the initial access page requested by the mobile terminal 10 to the Internet After receiving an initial access page request from the server 110, the initial access page is transmitted from the Internet server 110 to the mobile terminal 10.

The gateway 80 for the non-charging service, which has been assigned with the gateway IP address set for the non-charging service, judges that the limit of the mobile terminal 10 has expired when the mobile terminal 10 accesses the initial access page A limit expiration guide and a charging page are provided to the Internet server 100 providing the limit expiration information and the charging page, and then the limit expiration information and the charging page provided from the Internet server 100 are transmitted to the mobile terminal 10 send.

In another embodiment of the present invention, the gateway IP address assigned to the charging service and the gateway IP address set for the non-charging service are all assigned to one gateway, After requesting the initial access page after accessing using the IP address, the initial access page is requested to the Internet server 110 providing the initial access page, and the initial access page is transmitted to the mobile terminal 10, (Hereinafter, referred to as " non-billing service ") using the gateway IP address set for the non-billing service and then requests the initial access page, 100), and transmits the request to the mobile terminal 10.

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

First, when the mobile terminal 10 requests the establishment of a packet call (S10), the packet switch 20, which has requested a packet call, confirms whether the subscriber using the mobile terminal 10 is a legitimate subscriber, (Step S12).

In step S12, when requesting subscriber authentication by the authentication server 30, the packet switch 20 requests the subscriber authentication by transmitting the identification information of the subscriber using the mobile terminal 10 requesting the opening of the packet call.

In step S12, the authentication server 30 that has requested subscriber authentication from the packet switch 20 requests 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 requested the subscriber information from the authentication server 30 through the process S14, searches subscriber information of the corresponding subscriber using the subscriber identification information (S16), and is included in the searched subscriber information If the subscriber is identified as a prepaid subscriber in step S18, the subscriber information and non-billing service list retrieved in step S16 are transmitted to the authentication server 30 in response to the subscriber information request S20).

The authentication server 30, which receives the subscriber information from the subscriber information management server 40 through the process S20, checks the subscription information included in the subscriber information, and if the subscriber is confirmed as a prepaid subscriber in step S22, The subscriber terminal 50 requests the subscriber's limit charge (S24).

The SCP 50 which requested the limit fee of the specific subscriber from the authentication server 30 through the process S24 searches the limit fee of the corresponding subscriber, and when it is determined that the limit fee of the subscriber has expired, In response to the limit charge request, the subscriber informs that the limit charge is expired (S26).

The authentication server 30 notifies the subscriber that the subscriber has expired the limit fee from the SCP 50 through the above-described process S26. The authentication server 30 accesses the limit expiration information and the charging page when the mobile terminal 10 is non- To the packet switching center 20, the DNS IP address set for the non-charging service so as to be able to charge the user authentication response (S28).

In step S28, the authentication server 30 sends the DNS IP address set for the non-billing service and the non-billing service list converted into the IP index processable in the packet switch 20 together.

Upon receiving the user authentication response from the authentication server 30 through the above-described process S28, the packet switch 20 allocates the IP address of the mobile terminal 10 and then transmits the IP address and user authentication The local cache deletion request is included in the packet call establishment response together with the DNS IP address set for the non-billing service included in the response and transmitted to the mobile terminal 10 (S30).

Upon receiving the packet call establishment response from the packet switch in step S30, the mobile terminal 10 deletes the IP address stored in the local cache according to the local cache deletion request (S32), and stores the IP address in the local cache Since there is no IP address, after accessing the DNS 60 for the non-accounting service using the DNS IP address set for the non-accounting service included in the packet call establishment response, the initial access page (Step S34).

The DNS 60 for the non-charging service, which has received an IP address for the initial access page from the mobile terminal 10 through the above-described process S34, may limit the subscriber of the mobile terminal 10 requesting the IP address for the initial access page It is determined that the subscriber is an expired subscriber and the gateway IP address set for the non-billing service so that the mobile terminal 10 can access the Internet server 100 providing the limit expiration information and the charging page through the gateway 80 for the non- And the IP address of the Internet server 100 providing the limit expiration information and the charging page to the mobile terminal 10 in step S36.

In step S36, the mobile terminal 10 receives the gateway IP address set for the non-charging service and the IP address of the Internet server 100 providing the limit expiration information and the charging page from the DNS 60 for the non-charging service, The IP address of the Internet server 100 providing the limit expiration information and the charging page after accessing the gateway 80 for the non-charging service through the packet exchanger 20 using the gateway IP address set for the non-charging service, And requests an initial connection page to the gateway 80 for the non-billing service using S38.

In step S38, since the IP address (gateway IP address set for the non-charging service) of the gateway 80 to which the mobile terminal 10 wants to connect is included in the non-charging service list, (10) to be connected to the gateway (80).

The gateway 80 that has requested the initial access page through the above-described process S38 transmits an expiration expiration information and a charging page using the IP address of the Internet server 100 providing the limit expiration information and the charging page to the Internet server 100 (S40 and S42), and transmits the limit expiration information and the charging page provided from the Internet server 100 to the mobile terminal 10 through the packet switching center 20 S44).

The mobile terminal 10 connected to the limit expiration information and the charging page through the above-described series of processes can charge the prepaid fee.

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

The system and method for expiration expiration guidance service according to the present invention is characterized in that when a prepaid fee subscriber who has expired a limit tries to make a packet call, the mobile terminal is connected to the limit expiration information and the charging page without ending the packet call, The packet data service can be activated.

Brief Description of Drawings FIG. 1 illustrates an exemplary configuration of a limit expiration guidance service system according to an embodiment of the present invention. FIG.

FIG. 2 is an exemplary diagram illustrating an IP address conversion table applied to the present invention; FIG.

3 is a processing diagram for explaining a limit expiration guidance service method according to an embodiment of the present invention;

DESCRIPTION OF THE REFERENCE SYMBOLS

10. Mobile terminal, 20. Packet exchanger, 30. Authentication server,

40. Subscriber information management server, 50. SCP, 60. DNS for non-billing service,

70. DNS for billing services, 80. Gateway for non-billing services,

90. Gateway for billing service, 100, 110. Internet server

Claims (13)

In a limit expiration guidance service system, An authentication server for confirming the subscriber's limit charge through the SCP when the subscriber is requested to be authenticated as a prepaid subscriber, When receiving a request for opening a packet call from the mobile terminal, requests authentication of the subscriber to the authentication server and receives a DNS IP address set for the non-charging service in response to the authentication request, A packet switch for requesting deletion of a local cache upon transmission; When receiving an IP address from the access terminal using the DNS IP address, the gateway transmits an IP address of the Internet server providing the limit expiration information and the charge page to the mobile terminal, together with the gateway IP address set for the non-billing service And a DNS (Domain Name Server) The mobile terminal deletes the IP address stored in the local cache according to the local cache deletion request, and provides a limit expiration information and a charging page through the gateway accessed using the gateway IP address set for the non-charging service To the Internet server of the limit expiration guidance service system. The authentication server according to claim 1, When requesting authentication of the subscriber requesting the establishment of the packet call from the packet switch which has been requested to open a packet call, requests subscriber information to the subscriber information management server for managing subscriber information and transmits subscriber information about the subscriber and non- If the subscriber is identified as a prepaid subscriber as a result of checking the subscription information included in the subscriber information, the subscriber can check the subscriber's limit charge through the SCP that manages the charge of the prepaid subscriber, And transmits the subscriber authentication response including the DNS IP address set for the non-billing service together with the non-billing service list converted into the IP index when the subscriber authentication response is transmitted to the packet switch, when the limit has expired. system. The packet switching system according to claim 1, A request for establishment of a packet call from the mobile terminal is requested to the authentication server for authentication of the subscriber requesting the opening of the packet call, and in response to the authentication request, a DNS IP address set for the non- When receiving a billing service list, transmits a request for opening a packet call together with a DNS IP address set for the non-billing service and a request for deleting a local cache to the mobile terminal, And passes the packet only when the transmission destination or destination address of the packet flowing through the packet call belongs to the IP list in the IP index. The method of claim 1, A DNS IP address set for the billing service and a DNS IP address set for the non-billing service are allocated to the mobile terminal. After the mobile terminal accesses the DNS using the DNS IP address set for the billing service, And provides the IP address of the gateway set for billing service together with the IP address of the Internet server set for the billing service in response to the request, and the mobile terminal uses the DNS IP address set for the non-billing service The IP address of the Internet server providing the limit expiration information and the charging page is provided in response to the IP address for the initial connection page, and the IP address of the gateway set for the non-charging service is provided Features a limit expiration guidance service system. The method of claim 1, When the mobile terminal accesses and requests an IP address for the initial access page, the mobile terminal accesses the IP address of the initial access page, And provides the IP address of the gateway configured for the non-billing service with the IP address of the Internet server providing the billing and charging page. The gateway according to claim 1, When the mobile terminal accesses the gateway IP address set for the billing service and the gateway IP address set for the non-billing service using the gateway IP address set for the billing service, and then requests an initial access page Requesting an initial access page to the Internet server providing the initial access page, transmitting the request to the mobile terminal, accessing the initial access page using the gateway IP address set for the non-charging service, Requesting a page of the limit expiration information and the charging page, and requesting the limit expiration information and the charging page to the Internet server providing the limit expiration information and the charging page, and transmitting the request to the mobile terminal. The gateway according to claim 1, When the mobile terminal accesses and requests an initial access page, the mobile terminal accesses the internet service providing the limit expiration information and the charging page, Requesting a limit expiration guide and a charging page to the server, and transmitting the request to the mobile terminal. When a packet call establishment request including a local cache deletion request is received from the packet switch, together with the DNS IP address set for the non-billing service, the packet call establishment request is stored in the local cache according to the local cache deletion request After deleting the IP address, the IP address of the Internet server which requests the IP address of the initial access page by accessing the DNS with the DNS IP address set for the non-accounting service, and provides the limit expiration information and the charging page in response thereto Receiving the gateway IP address set for the non-charging service together with the address, accesses the gateway using the gateway IP address set for the non-charging service, requests the initial access page to the gateway, An expiration guide, and a charging page. Upon receiving a request for authentication of a subscriber requesting the establishment of the packet call from a packet switch that is requested to open a packet call from the mobile terminal, the subscriber information management server requests subscriber information on the subscriber to the subscriber information management server managing the subscriber information, If the subscriber information of the subscriber and the non-billing service list are received in response to the subscriber information, the subscriber information of the subscription information included in the subscriber information is checked and if the subscriber is identified as the prepaid subscriber, the SCP Charging service list is converted into an IP index, and then the non-charging service list converted into the IP index is transmitted to the non-charging service list in the non- With the DNS IP address set for billing service, The authentication server, characterized in that for transmitting a kit exchanger. Requesting establishment of a packet call from the mobile terminal, requesting authentication of the subscriber requesting the opening of the packet call to the authentication server, requesting authentication of the subscriber in response to the subscriber authentication response received from the authentication server, Allocating an IP address of the mobile terminal if the DNS IP address set for the service is included, transmitting the allocated IP address to the mobile terminal by including the allocated IP address in a packet call establishment response, A destination address of a packet flowing through the packet call established between the mobile terminal and the mobile terminal is included in the IP list in the IP index And the packet is passed only when the packet is received. delete delete In a limit expiration guidance service method, Requesting authentication of a subscriber requesting establishment of the packet call to an authentication server in a packet switched network in which a packet call is requested from a mobile terminal; If the subscriber is a prepaid subscriber whose expiration date has expired as a result of performing authentication with the subscriber at the authentication server, transmitting the subscriber authentication response including the DNS IP address set for the non-billing service to the packet switch; Transmitting a packet call establishment response with the DNS IP address and a local cache deletion request in the packet switch establishment response; Upon deletion of the IP address stored in the local cache in response to the local cache deletion request, the mobile terminal accesses the DNS with the DNS IP address and requests an IP address. Then, the DNS issues a limit expiration information and a charging page Providing a gateway IP address set for a non-charging service together with an IP address of an Internet server; And accessing the Internet server providing the limit expiration information and the charging page through the gateway accessed by using the gateway IP address set for the non-billing service by the mobile terminal .

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