Patent ID: 6408186
Filing Date: 2002-06-18
Classification: G01S,H04W

Abstract:
A method for measuring a mean error distance to adjust the distance between a mobile phone and a base station in a cell obtained by a round-trip delay (RTD) of a prescribed message transmitted from said base station to said mobile phone in a cellular mobile telephone system (CMTS), said method comprising the steps of:determining a plurality of measuring points within the cell of said base station to be used for obtaining said mean error distance; measuring respective RTDs between said measuring points and said base station by sequentially positioning said mobile phone at each of said measuring points; calculating respective RTD distances between said measuring points and said base station based on said RTD measurements; obtaining respective Global Positioning System(GPS) data for said measuring points and said base station; calculating respective GPS distances between said measuring points and said base station based on said GPS data; calculating respective error distances by taking the difference between said respective RTD distances and said GPS distances; and, obtaining said mean error distance from said respective error distances.