Patent ID: 9026133
Filing Date: 2015-05-05
Classification: G01S,H04W

Abstract:
1. A method, comprising: receiving, by a system comprising a processor, measurement report data representing a location of a first mobile device and observed time differences for signals that were received by the first mobile device and sent from macrocell devices in range of the first mobile device, wherein the location represents the location of the first mobile device at a time corresponding to the observed time differences being determined and wherein an observed time difference of the observed time differences is a difference between a first time indicating when a signal of the signals was sent from a macrocell device and a second time determined based on when the signal was received at the first mobile device; translating, by the system, the observed time differences that correspond to the location to a set of translated observed time differences that correspond to a reference location, wherein the reference location and the location are different from each other; determining, by the system, reference time differences for the macrocell devices as a function of the reference location and the set of translated observed time differences; receiving, by the system, second observed time differences of signals from a second mobile device, wherein the second mobile device is different from the first mobile device; calibrating the second observed time differences of signals with the reference time differences to create calibrated second observed time differences of signals wherein the calibrating the second observed time differences further comprises subtracting the reference time differences from the second observed time differences of signals for the macrocell devices; and determining, by the system, a second location of the second mobile device based on the calibrated second observed time differences of signals.