Patent ID: 8948786
Filing Date: 2015-02-03
Classification: G01S,H04W

Abstract:
1. An apparatus comprising: a decision processing module configured to determine whether a first mobile user terminal and a second user terminal are within a relative geographic proximity of one another in dependence on at least one property associated with intermediate network equipment of a packet-switched network to which the first mobile user terminal and second user terminal are operable to connect, the at least one property comprising a transmission time of a packet travelling between the first mobile user terminal and second user terminal via said intermediate network equipment, the decision processing module further configured to remove from said transmission time a delaying effect of one or more switches and/or routers in the intermediate network equipment, the relative geographic proximity of the first mobile terminal and second user terminal being determined in dependence on the transmission time after removal of said delaying effect; and a location processing module configured to obtain a geographic location of the second user terminal and, on condition that the first mobile user terminal and second user terminal are determined to be within said relative geographic proximity, to use the geographic location of the second user terminal in estimating a geographic location of the first mobile user terminal.