Processes for determining the round trip air time between a mobile radio station and a first base radio station, to determine the distance between a mobile radio station and a first base radio station, to determine the distance from a mobile radio station in a communication system, to determine the position of a mobile radio station, and, system to determine the distance between a mobile radio station and a first base radio station

摘要

"PROCESSES TO DETERMINE THE ROUND AIR TRAVEL TIME FROM A MOBILE RADIO STATION TO A FIRST BASE RADIO STATION, TO DETERMINE THE DISTANCE BETWEEN A MOBILE RADIO STATION AND A FIRST RADIO RADIO STATION, OF A MOBILE RADIO STATION IN A COMMUNICATION SYSTEM, TO DETERMINE THE POSITION OF A MOBILE RADIO STATION, AND, SYSTEM TO DETERMINE THE DISTANCE BETWEEN A MOBILE RADIO STATION AND A FIRST 500 (RADIO) STATION SYSTEM (500) and RADIO SYSTEM (500). (200) are exposed by which a round trip calculation is used to determine the distance between a mobile radio station (MS) (208) and a base radio station (BS) (BS0, BS1, BS2) using the apparent upper link and lower link signal propagation air times (for example, T-upper and T-lower). As such, no absolute time reference is required. The MS and BS report to a service node (203) on the mobile network (200) the local start and finish times (308, 328) of the upper link and lower link signals (212-215), and calculate the apparent times air, T-top and T-bottom. The distance, D, between the MS and BS can be calculated as D = c (T-upper + T-lower) / 2, where "c" equals the speed of light. The distances D1, D2 and D3, for at least three base stations whose locations are known, can be used in a triangulation algorithm to determine the position of the MS.