System and method for invoking applications based on a location of a mobile station

A method, performed by a computer associated with a packet data serving node, for tracking a mobile station, the method comprising:

• receiving, at the computer, a current access network identifier from the mobile station;
• comparing the current access network identifier with a previous access network identifier;
• generating a current access network bearer trigger message including the current access network identifier when the current access network identifier is different from the previous access network identifier;
• and
• transmitting the current access network bearer trigger message from the packet data serving node to a cellular serving system, the cellular serving system adapted to update a current access network identifier portion of a registrar database based upon the current access network bearer trigger message.

A packet data serving node for tracking a mobile station, the packet data serving node comprising:

• a receiver for receiving a current access network identifier from the mobile station;
• a processor for comparing the current access network identifier with a previous access network identifier;
• a message generator for generating a current access network bearer trigger message including the current access network identifier when the current access network identifier is different from the previous access network identifier;
• and
• a transmitter for transmitting the current access network bearer trigger message to a cellular serving system, the cellular serving system adapted to update a current access network identifier portion of a registrar database based upon the current access network bearer trigger message.

A wireless network for tracking a mobile station, the wireless network comprising:

• a first receiver for receiving a current access network identifier from the mobile station;
• a first processor for comparing the current access network identifier with a previous access network identifier;
• a message generator for generating a current access network message including the current access network identifier when the current access network identifier is different from the previous access network identifier;
• a first transmitter for transmitting the current access network message;
• a second receiver for receiving the current access network message;
• and
• a second processor for updating a current access network identifier portion of a registrar database based upon the current access network message.

A computer recording medium, including computer executable code capable of being run on a computer associated with a packet data serving node, for tracking a mobile station, the computer recording medium comprising:

• computer executable code for receiving a current access network identifier from the mobile station;
• computer executable code for comparing the current access network identifier with a previous access network identifier;
• computer executable code for generating a current access network bearer trigger message including the current access network identifier when the current access network identifier is different from the previous access network identifier;
• and
• computer executable code for transmitting the current access network bearer trigger message from the packet data serving node to a cellular serving system, the cellular serving system adapted to update a current access network identifier portion of a registrar database based upon the current access network bearer trigger message.