Patent ID: 6947753

Claim:
A method for mobile station location determination, the method comprising, at a processing unit, the steps of: retrieving received signal strength measurements of signals sent from a plurality of base stations to the mobile station; retrieving the transmitted signal strength value and the electromagnetic field distribution model function corresponding to each of the plurality of base stations; setting up an estimation error function with, for each of the plurality of base stations, the transmitted signal strength, received signal strength, and electromagnetic field distribution model function, the estimation error function being given by: F ⁡ ( γ , x , y ) = ∑ j = 1 m ⁢ M ( P Rj - γ · P Tj · G j ⁡ ( x , y ) ) where x and y are coordinates of the mobile station, m is the number of base stations that the mobile station measured signals from, M is a metric of optimisation, P Rj is received signal strength, P Tj is transmitted signal strength, γ is an attenuation factor and G j (x,y) is the electromagnetic field distribution model function; calculating a global minimum of the estimation error function; and communicating the solution to the global minimum.