Patent Document ID: 6140964
Application ID: 08819985
Patent Flag: 1

Claim One:
1. A method of detecting a position of a particular mobile station in a radio communication system including at least the mobile station, a plurality of base stations and a control station, said method comprising the steps of: measuring only reception strength levels of radio signals from said plurality of base stations at a plurality of measuring points using at least one mobile station of said radio communication system; transmitting a result of the measurement from said at least one mobile station to said control station through one of said base stations; performing a learning operation in said control station through a neural network, to learn a correlation between said strength levels of said radio signals and the position of said at least one mobile station on the basis of said measurement results at said plurality of measuring points and on the basis of position data of said measuring points, said neural network having a plurality of input layer nodes corresponding in number to the number of said base stations so that each of said input layer nodes corresponds to one of said base stations, said neural network having output layer nodes whose number is sufficient for indicating positional information whereby said neural network learns such that said neural network outputs positional information of said respective measuring points when receiving said reception strength levels at each of said base stations corresponding to each of said respective nodes of said input layer with respect to all of said measuring points; conveying measurement results of strength levels of said radio signals from each of said plurality of base stations, measured by said particular mobile station at an arbitrary point, to said control station through one of said base stations; and estimating by said control station a position of said particular mobile station which has provided said measurement results, on the basis of said correlation between said strength levels of said radio signal and a position of said at least one mobile station attained through the learning operation.