Patent ID: 6101391
Filing Date: 2000-08-08
Classification: H04W

Abstract:
A mobile communication system including plural base stations synchronized with each other, a control station for performing general administration of the plural base stations, and plural mobile stations, each of said plural base stations comprising:distance calculating means for calculating distances between the base station and respective mobile stations, on a basis of signal transmission velocities and signal transmission times which are obtained by communicating with said respective mobile stations;transmitting means for transmitting the calculated distances to said control station, andsaid control station comprising:position determining means for determining positions of said respective mobile station, on a basis of the distances between said respective base stations and said respective mobile stations, which are transmitted by said plural base stations to said control station;storage means for storing a same identification code for specific ones of said mobile stations out of said plural mobile stations; andnotifying means for determining whether any other mobile station having said same identification code exists within a range scale designated by one of said specific ones of said plural mobile stations, and for providing a result of the determination to said one of plural mobile stations via one of said base stations, whereinsaid notifying means, if other mobile stations having the same identification code exist within said range scale, provides positional information of said one of said specific ones of said plural mobile stations to the remaining mobile stations of said specific plural mobile stations.