Patent ID: 7312753
Filing Date: 2007-12-25
Classification: H04W

Abstract:
1. A mobile terminal positioning system for positioning a mobile radio terminal apparatus by detecting the arrival time of a signal between a radio base station apparatus and the mobile radio terminal apparatus, said radio base station apparatus comprising: estimating means for calculating reception SIRs (Signal to Interference power Ratios) for respective subcarriers with respect to a received signal from said mobile radio terminal apparatus; averaging means for averaging the SIRs calculated for the respective subcarriers by said estimating means; threshold value setting means for setting a threshold value for a path search based on an SIR calculated by said averaging means; first path detecting means for conducting said path search based on the threshold value set by said threshold value setting means, to detect a first path; and arrival time calculating means for calculating said arrival time based on the first path detected by said first path detecting means.