Patent ID: 9078228
Filing Date: 2015-07-07
Classification: G01S,H04W

Abstract:
1. A method of estimating a location of a mobile communication unit in a cellular wireless communications system, the cellular wireless communications system comprising mobile communication units, the method comprising: a processor; compiling a first signature, for signals received by a first mobile communication unit at a first point in time, the first signature comprising: control information; a set of cells, the set of cells being cells observable by the first mobile communication unit; and received power level information, for signals received from the observable cells; estimating a location of the first mobile communication unit at the first point in time, the estimate being based on location information of a first known signature, the first known signature being selected by comparing the first signature with known signatures entered in a database, the known signatures comprising location information, wherein comparing the current signature with entries in the database of known signatures comprises: determining a difference between each part of the first signature and the corresponding part of a known signature in the database; squaring each difference; and scaling and adding the squared differences.