S.S. Saab and S.M. El Kabbout (Lebanon)
Mobile Positioning System (MPS), Map Matching, GSM,
As operators, in the U.S., strive to meet the FCC
mandates and regulations continue. Some operators have
been asking for waivers, for not being able to meet Phase
II of E911, which calls for a strict location of mobile users
upon initiating 911 calls from their mobile stations (MS).
So far, no work has been claimed to meet the FCC–E911
tolerances for locating mobile phones without GPS
assistance. In this paper, a mobile positioning system
(MPS) is proposed based on a map-matching algorithm.
Using the triangulation or a trilateration technique, the
Cell of Origin, Time of Arrival, and Time Difference of
Arrival, the mobile is first located within a specified area
of about 500x500 squared meters in a GSM network and
within a specified area of about 244x244 squared meters
in an IS-95 network. The received powers and channel
IDs from different BTSs at discrete locations are initially
collected and stored in a database, leading to “unique”
signatures within a “sufficiently” small neighborhood.
The mobile location is resolved by correlating the
received power from different BTSs to the database.
Experimental work is presented and analyzed to examine
the feasibility of applying the proposed MPS to meet the