Patent ID: 7212830
Filing Date: 2007-05-01
Classification: G01S,H04W

Abstract:
1. A position detection method in a terminal position detection system, the detection system including a plurality of terminals, a plurality of access points capable of conducting radio communications with said terminals, and server equipment connected to said plurality of access points via a network, said server equipment being adapted to perform a position measurement procedure for measuring a position of the terminal using a signal transmitted/received between said terminal and one of said plurality of access points, the method comprising the steps of: in the case of repetitively performing a position detection procedure, performing a group composition determination procedure which involves determining whether two or more terminals should be classified as belonging to a same group based on detected positional information for said plurality of terminals; selecting at least one terminal from the terminals belonging to the same group as a representative terminal of the group; performing said position measurement procedure of the selected representative terminal; and estimating the position of the terminal other than the representative terminal and belonging to the same group using a relative velocity thereof to said representative terminal so as to detect the position of the terminal, thereby performing a group position detection procedure.