| 摘要 |
A METHOD AND SYSTEM ARE DISCLOSED BY WHICH A ROUND-TRIP CALCULATION IS USED TO DETERMINE THE DISTANCE BETWEEN A MOBILE RADIO STATION (208) AND A RADIO BASE STATION (BS0) USING THE APPARENT UPLINK AND DOWNLINK SIGNAL PROPAGATION AIR-TIMES (E.G., T-UP AND T-DOWN). AS SUCH, NO ABSOLUTE TIME REFERENCE IS REQUIRED. THE MS (208) AND BS (BS0) REPORT TO A SERVICE NODE (203) IN THE MOBILE NETWORK THE LOCAL DEPARTURE AND ARRIVAL TIMES OF THE UPLINK AND DOWNLINK SIGNALS, AND CALCULATE THE APPARENT AIR-TIMES, T-UP AND T-DOWN. THE DISTANCE, D, BETWEEN THE MS AND BS CAN BE CALCULATED AS D=C(T-UP+ T-DOWN)/2, WHERE "C" EQUALS THE SPEED OF LIGHT. THE DISTANCES, D1, D2 AND D3, TO AT LEAST THREE BASE STATIONS WHOSE LOCATIONS ARE KNOWN, CAN BE USED IN A TRIANGULATION ALGORITHM TO DETERMINE THE MS'S (208) POSITION.
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