Patent ID: 8781507

Claim:
A method in a mobile device, the method comprising: receiving transmit time offsets (t ij ) for a plurality of base station pairs (BS i BS j ) in a set of base stations from a non-carrier base station almanac; computing a time offset (Δ A1 ) between the mobile device at a first location (x 1 , y 1 ) and a serving base station (BS A ) at a second location (x A , y A ), wherein the set of base stations comprises the serving base station (BS A ); and calculating time offsets (Δ k ) for at least one imperceptible base station (BS k ) in the set of base stations, based, at least in part, on the received transmit time offsets (t ij ) of the plurality of base station pairs (BS i , BS j ) in the set of base stations, and the time offset (Δ A1 ) between the mobile device and the serving base station (BS A ).