Abstract:
In one embodiment, there is disclosed a system and method for providing access to an IP number or a subscriber identity number associated with a mobile device in a network, the method comprising associating a mobile device with a subscriber identity number; generating a temporary IP number for the mobile device; linking the subscriber identity number with the temporary IP number; storing the subscriber identity number and the temporary IP number in a database; and providing a pull application program interface to extract from the database either the subscriber identity number or the IP address for mobile device when requested by an application program.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
       [0001]    This application is a continuation of U.S. patent application Ser. No. 09/596,802, filed Jun. 19, 2000 which claims priority from U.S. Provisional Application Ser. No. 60/188,437, filed Mar. 10, 2000, the disclosures of which are incorporated herein by reference. 
     
    
     
       BACKGROUND  
         [0002]    1. Technical Field of the Invention  
           [0003]    The present invention relates to wireless application protocol (WAP) systems, and more particularly, to the mapping of temporary IP addresses to established MSISDN numbers.  
           [0004]    2. Description of Related Art  
           [0005]    Wireless application protocol (WAP) is positioned at the conversions of two rapidly evolving network technologies, wireless data and the Internet. Both the wireless data market and the Internet are growing very quickly and are continuously reaching new customers. The explosive growth of the Internet has fueled the creation of new and exciting information services. Most of the technology developed for the Internet has been designed for desktop and larger computers and medium to high bandwidth networks.  
           [0006]    Hand held wireless devices present a more constrained computing environment compared to desktop computers. They have less powerful CPU&#39;s and memory than desktop systems. Similarly, wireless data networks present a more constrained communications environment compared to wired networks. Wireless networks have fundamental limitations with respect to power, available spectrum and mobility. The WAP specification has been developed to address mobile network characteristics by adapting existing network technologies for the Internet to the specialized requirements of hand-held wireless data devices.  
           [0007]    Access to a wireless application protocol system utilizing WAP technologies is provided via a WAP gateway node. The WAP gateway node is normally located within an Internet service provider (ISP) providing access to the Internet for mobile terminals. However, the WAP gateway node may alternatively be provided by a mobile services operator. In order to obtain access to the WAP gateway node, a user must be authenticated. There are two possible authentication points for a user. The first authentication point is during setup of a data call. This authentication is handled by the integrated access system (IAS) located within a mobile switching center utilized by the mobile terminal and/or a remote authentication dial-in user service (RADIUS) authentication server located in the WAP network.  
           [0008]    The user may also be authenticated when accessing particular servers within the WAP network. This manner of authentication may be handled in two different ways. Proxy authentication may be used wherein the WAP gateway returns a status code of “407” to a WAP browser. This initiates the same type of basic authentication as occurs for a hypertext transport protocol (HTTP) message. A user ID and password are entered by the user in response to this status code and this data is included within every IP packet from the browser.  
           [0009]    A WAP gateway supports several different types of bearer messages, for example, IP, SMS, USSD, etc. A MSISDN is used within the WAP gateway to determine if a user is allowed to use the WAP gateway node, to charge for using the WAP gateway node, and to enable charges for specific content to be transmitted. If SMS or USSD bearer protocols are used, the MSISDN is always included within the data packet and this poses no identification problems for the WAP gateway. However, when using the IP protocol, the integrated access system within the mobile switching center allocates a temporary IP address to the mobile terminal. This IP address is included within messages transmitted to the WAP gateway. The WAP gateway has no way at present to determine the MSISDN number associated with a particular IP address. Thus, some manner for enabling the WAP gateway to associate the temporary IP addresses with a fixed MSISDN number is desired.  
         SUMMARY  
         [0010]    The present invention overcomes the foregoing and other problems with a system and method for associating an MSISDN number of a mobile terminal with a temporarily assigned IP address for use with authentication, billing and personalization processes in a network. In response to a wireless network access request by a mobile terminal, a first server located within the wireless network, generates a start packet. The start packet contains an MSISDN of the mobile terminal and an IP address assigned to the mobile terminal by the first server. The start packet is transmitted to a second server within a wireless application protocol network wherein a second server extracts the MSISDN and the assigned IP address from the start packet and stores the MSISDN and the assigned IP address within a database. The database enables storage of the MSISDN and the IP address together such that the database may be accessed using an interface to determine an MSISDN associated with the IP address.  
           [0011]    The first server may also generate stop packets responsive to disconnection of the mobile terminal from the wireless network. The stop packet also contains the MSISDN and assigned IP address of the mobile terminal and, responsive to receipt of the stop packet, the second server determines the MSISDN and IP address from the stop packet and deletes these entries from the database.  
       
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS  
       [0012]    A more complete understanding of the method and apparatus of the present invention may be obtained by reference to the following Detailed Description when taken in conjunction with the accompanying Drawings wherein:  
         [0013]    [0013]FIG. 1 is a block diagram illustrating a WAP network;  
         [0014]    [0014]FIG. 2 is a block diagram of a WAP network incorporating the IP to MSISDN mapping technique of the present invention;  
         [0015]    [0015]FIG. 3 is a signaling diagram illustrating a request of a particular WAP application by a mobile terminal; and  
         [0016]    [0016]FIG. 4 is a signaling diagram illustrating the termination of a PPP connection between a mobile terminal and the WAP gateway. 
     
    
     DETAILED DESCRIPTION  
       [0017]    Referring now to the drawings, and more particular to FIG. 1, there is illustrated a WAP network  10 . A micro browser  15  within a wireless terminal  20  enables the user to access world wide web servers  25  on the Internet via a WAP gateway server  30 . The WAP gateway  30  comprises a protocol gateway which translates requests from a WAP protocol (WSP, WTP, WTLS and WDP) to a WWW protocol (HTTP and TCP/IP). This is accomplished via content encoders and decoders  35  within the WAP gateway server  30 .  
         [0018]    Referring now to FIG. 2, there is illustrated a block diagram of a system which utilizes radius accounting messages as a manner for mapping IP addresses to an MSISDN number. While the following description of mapping an IP address to an MSISDN number is done with respect to an authentication process, the system and method may also be used with a billing process, personalization process, etc. The system includes a mobile terminal  45  which may comprise a mobile telephone, portable computer, personal data assistant or any other mobile electronic device capable of communicating with a MSC/VLR  50  via a wireless radio network  55 . It should be well understood by one skilled in the art that the wireless radio network for communicating between the mobile terminal  45  and MSC/VLR  50  would consist of a base transceiver station, base station and other components necessary within a wireless radio network.  
         [0019]    While the described embodiment uses RADIUS Accounting messages to carry out the described invention, other systems performing similar functions may be used. When a client is configured to use RADIUS Accounting, at the start of service delivery the client will generate an Accounting Start packet describing the type of service being delivered and the user to whom the service is being delivered. The Accounting start packet is sent to the RADIUS Accounting server, which will send back an acknowledgment that the packet has been received. At the end of service delivery the client will generate an Accounting Stop packet describing the type of service that was delivered and optionally statistics such as elapsed time, input and output octets, or input and output packets. The client will send that to the RADIUS Accounting server, which will send back an acknowledgment that the packet has been received. By the present invention, RADIUS is used for transmitting IP-address and MSISDN at session start. Other types of information can also be transmitted, e.g., by using RADIUS Accounting for billing or personalization procedures. Other systems capable of transmitting the IP address and MSISDN information between the networks might also be used in place of a RADIUS system.  
         [0020]    The MSC/VLR  50  includes a remote authentication dial-in user service (RADIUS) server  60  configured to transmit a RADIUS accounting message from the MSC/VLR  50  to the WAP gateway  70 . The RADIUS accounting messages are transported to the WAP gateway  70  through routers  65  interconnecting the MSC/VLR  50  and the WAP gateway  70 . A RADIUS accounting server  75  is located within the WAP gateway  70 . The RADIUS accounting server  75  is responsive to the received RADIUS accounting messages from the MSC/VLR  50  and upon receipt of these messages updates a mapping session database  80  within the WAP gateway  70 . The mapping session database  80  includes a plurality of storage locations for an assigned temporary IP address and an associated MSISDN of the mobile terminal  45 .  
         [0021]    The RADIUS accounting messages comprise packets of data which describe the type of service being delivered, and the user to which the service is to be delivered. Information in the packet includes among other things, the MSISDN number, number of frames, and the IP address of the mobile terminal  45 . The information within a packet relating to IP address and MSISDN number is used to update the database  80  within the WAP gateway  70 . RADIUS accounting messages indicating the stoppage of a connection between a mobile terminal  45  and the WAP gateway  70  cause the database  80  to be updated such that the MSISDN and IP address for the mobile terminal are no longer stored and associated together in the database.  
         [0022]    Once a mobile terminal  45  has been properly authenticated by the WAP gateway  70  and the IP address and the IP address and MSISDN of the mobile terminal stored in the database  80 , the mobile terminal may access applications  85  within the WAP network. The RADIUS authentication server, in collaboration with a translation application program (API) interface  88 , provides a conduit for the database  80 , enabling applications to access and determine a MSISDN associated with an IP address for the mobile terminal  45 .  
         [0023]    Referring now to FIG. 3, there is provided a first example of a signaling diagram utilizing the method for mapping a MSISDN number to a temporarily assigned IP address for a mobile terminal  45  accessing a WAP gateway  70 . The process illustrated in FIGS.  3  describes when a mobile terminal  45  requests use of a WAP application  85  residing upon a web server on the Internet. The mobile terminal  45  transmits a message  100  to the access server  60  in order to establish a connection to the access server using the point-to-point protocol (PPP). Before establishing a connection with the mobile terminal  45 , the access server  60  performs an authentication process wherein the mobile terminal  45  transmits authentication information including the PPP User ID of the mobile terminal and a password to the access server  60  using a password authentication procedure (PAP).  
         [0024]    The access server  60 , residing within the mobile switching center  50  (FIG. 2) generates an access request message  105  for transmission to the RADIUS Authentication server  78  located within the WAP gateway  70 . The access request message  105  includes the PPP User ID and password transmitted to the access server  60  by the mobile terminal  45 . The access request message comprises a request from the access server  60  to the RADIUS server  75  requesting user access to a particular site. The RADIUS server  75  replies to the access server  60  with an access accept message  110  to indicate that access has been granted to the mobile terminal  45 .  
         [0025]    Next, a PPP connection is established between the access server  60  and the mobile terminal  45 . IP packets are transmitted over the connection. The only information included about the sender within the IP packets transmitted over the PPP connection is the IP address of the source mobile terminal  45 . The IP address cannot alone be used as a user ID since the IP address is dynamically allocated to the mobile terminal  45  by the access server  60  or the RADIUS server  75  during the PPP connection setup.  
         [0026]    To overcome this problem, the IP address and the MSISDN of the mobile terminal  45  are transmitted over the PPP connection from the access server  60  to the WAP gateway  70  as an accounting request message  115  to enable mapping between these identifiers. The IP address and the MSISDN are stored as a record  118  within the mapping session database  80  within the WAP gateway  70 . The WAP gateway  70  replies to the accounting request message  115  by means of a mandatory accounting response message  120  to the access server  60  using the RADIUS protocol. Once this connection is established, the user may generate a request  130  for access to a particular WAP application  85  (“service”) on a web server. This request is forwarded from the mobile terminal  45  to the WAP gateway  70 . The WAP gateway  70  forwards the mobile terminal request  138  to the requested application  85 . The WAP gateway  70  may determine the IP address of the mobile terminal  45  by examining the IP packet header to determine the IP address of the mobile terminal. The MSISDN of the mobile terminal  45  is determined by examining the mapping session database  80  and the associated IP address via the application program interface  88 . The determined MSISDN is placed in an HTTP header of packets used to contact the WAP application  85 .  
         [0027]    Referring now to FIG. 4, there is illustrated a signaling diagram wherein a mobile terminal  45  with an established PPP connection to the access server  60  terminates the PPP connection. Initially, the mobile station  45  terminates at  135  the PPP connection with the access server  60 . In response to the termination of the PPP connection, the access server  60  transmits an accounting request stop message  140  to the WAP gateway  70 . This request includes the MSISDN and IP address of the mobile terminal  45 . In response to the accounting request stop message  140 , the WAP gateway  70  removes the entry within the mapping session database  80  associated with the MSISDN number and IP address. The WAP gateway  70  responds to the accounting request stop message by means of an accounting response message  145  acknowledging cancellation of the PPP connection.  
         [0028]    The previous description is of a preferred embodiment for implementing the invention, and the scope of the invention should not necessarily be limited by this description. The scope of the present invention is instead defined by the following claims.