Patent ID: 8874133
Filing Date: 2014-10-28
Classification: G01S,H04W

Abstract:
1. A method of estimating a location of a mobile communication unit in a cellular wireless communications system, the method comprising the steps of: deriving a first estimate of the position of a mobile communication unit, from at least one received signal power difference, for signals received by the mobile communication unit from at least two network nodes; deriving a first likelihood function for the first estimate, the first likelihood function indicating the probability that the mobile communication unit is at each spatial location in the cellular wireless communications system; deriving at least one second estimate of the position of the mobile communication unit, from further information; deriving a second likelihood function for each of the at least one second estimates, the second likelihood function indicating the probability that the mobile communication unit is at each spatial location in the cellular wireless communications system; weighting the first likelihood function, based on the reliability of the first estimate; weighting each second likelihood function, based on the reliability of the corresponding second estimate; combining the weighted first and second likelihood functions to provide an overall likelihood function for the probability that the mobile communication unit is at each spatial location in the cellular wireless communications system; and selecting one or more spatial locations in the cellular wireless communications system as the estimated location based on the overall likelihood function.