Patent ID: 8725161
Filing Date: 2014-05-13
Classification: G01S,H04W

Abstract:
1. A method comprising, with a mobile device: receiving a signal from a base station in a wireless communication network; measuring a time of arrival and a power of the received signal at the mobile device; determining an excess delay value for the received signal based, at least in part, on an exponential relationship in which the excess delay value increases exponentially as the measured power decreases, the excess delay value representing an additional distance or an additional time that the received signal is estimated to have traveled from the base station to the mobile station with respect to a distance or a time corresponding to a direct line of sight path from the base station to the mobile station, wherein the exponential relationship is indicative of a likelihood of signal deflection, which increases as a function of a distance traveled from the base station; generating a biased time of arrival for the received signal based, at least in part, on the measured time of arrival and the excess delay value; and estimating a position of the mobile device based, at least in part, on the biased time of arrival.