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Evolution of Mobile Positioning and Location-based Services (LBS)

Gerry Christensen

Mobile positioning and location-based services (LBS) have come a long way since the FCC order for phase II of 9-1-1 dictated that cellular operators provide location of emergency callers within a certain degree of location accuracy.  This caused carriers in the USA to support two technical solutions.  One solution is Assisted GPS (A-GPS) and another is Time Division of Arrival (TDOA).  AT&T Wireless and T-Mobile went with T-DOA to avoid handset upgrade costs while Verizon Wireless and Sprint PCS went with A-GPS.  In the late 1990’s, there were very few commercial LBS applications and most usage of mobile positioning was for supporting 9-1-1 calls.  During this time frame, almost all cellular carrier infrastructure utilized Control Plane solutions that relied upon the use of expensive network hardware, carrier controlled signaling (via SS7), and the use of intelligent network technologies.... Read article.

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