Patent ID: 7821458
Filing Date: 2010-10-26
Classification: G01S,H04L

Abstract:
1. An apparatus for locating a terminal in a wireless communication system, the apparatus comprising: a candidate region determiner for determining a candidate region of a terminal by using tag signal arrival time information of the terminal provided from a plurality of readers; a virtual location determiner for determining a virtual location of the terminal in the candidate region in consideration of a reference location and a propagation delay of the tag signal; and a final location determiner for predicting a tag signal arrival time from the virtual location and for determining the virtual location as the final location if a difference between the predicted tag signal arrival time and a measured tag signal arrival time is less than or equal to a threshold value, wherein the virtual location determiner determines a new virtual location by using the virtual location as the reference location when the difference between the predicted tag signal arrival time and the measured tag signal arrival time is greater than the threshold value.