Patent ID: 6263208
Filing Date: 2001-07-17
Classification: G01S,H04W

Abstract:
A method of estimating the location of a mobile communications unit in a wireless communications service area, comprising the steps of:(a) receiving signal strength measurements transmitted from a mobile unit located in the service area, said signal strength measurements being specific to the location wherein the mobile unit is presently located;(b) computing a location probability distribution using Bayes theorem of the mobile unit within the service area in response to the received signal strength measurements using analytical results derived from a model that accounts for distance loss, shadow fading, fast fading and measurement errors the service area being defined in terms of a set of stored parameters that are associated with each of said plurality of locations in the service area; and(c) generating an output indicative of the probability that the mobile unit is located at each of said plurality of locations in the service area.