Patent ID: 7251491

Claim:
A method of supporting a handover decision in a wireless communication system comprising: obtaining at least four time of arrival measurements for a subscriber station from at least four transmitting sources, wherein the at least four transmitting sources comprise known locations; calculating initial x 1 , y 1 and z 1 coordinates and network time t 1 for the subscriber station; calculating a next x 2 , y 2 and z 2 coordinates and network time t 2 for the subscriber station; obtaining a velocity vector for an x component by (x 2 −x 1 )/(t 2 −t 1 ), a y component by (y 2 −y 1 )/(t 2 −t 1 ) and a z component by (z 2 −z 1 )/(t 2 −t 1 ); obtaining a magnitude of the vector by √{square root over (x 2 y 2 z 2 )}; obtaining an estimate of position of the subscriber stations from the next x 2 , y 2 and z 2 coordinates, velocity of the subscriber station from the obtained magnitude of the vector and direction of motion of the subscriber station from a direction of the vector; and using the estimate, or information derived there-from, to support the handover decision.