Patent ID: 7519050

Claim:
A method for tracking a mobile station, the method comprising: receiving, by a first access layer element of a wireless network, a current access network identifier from the mobile station, the current access network identifier based at least in part on a packet zone serving the mobile station; comparing the current access network identifier with a previous access network identifier; 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; requesting, by the first access layer element, a list comprising one or more location based options corresponding to the current access network identifier from a second access layer element; storing, by the first access layer element, the list including the location based options in the current access network message; transmitting the current access network message from the first access layer element to an application layer element of the wireless network, the application layer element adapted to cause the one or more location based options corresponding to the current access network identifier to be invoked; and updating a current access network identifier portion of a registrar database in the application layer element based upon the current access network message.