Patent ID: 8493205

Claim:
A method comprising: (a) receiving, by a location server, a measurement of a first characteristic of a first signal that is processed by a wireless terminal; (b) estimating, by said location server, based at least in part on said received measurement of said first characteristic of said first signal, whether said wireless terminal is indoors or said wireless terminal is outdoors; (c) based on a plurality of possible locations of said wireless terminal, (i) when said wireless terminal is estimated to be indoors, designating each possible location that is outdoors as improbable, and (ii) when said wireless terminal is estimated to be outdoors, designating each possible location that is indoors as improbable; and (d) estimating, by said location server, a location of said wireless terminal based on a comparison of said measurement of said first characteristic of said first signal to a predicted value of said first characteristic of said first signal for at least one of said plurality of possible locations, wherein said at least one of said plurality of possible locations is not designated as improbable.