Patent ID: 7379744
Filing Date: 2008-05-27
Classification: H04W

Abstract:
1. A positioning system, comprising: a terminal station; a positioning server; and three or more access points that are each connected to the terminal station by wireless communication and each connected to the positioning server through a network, wherein one of the access points transmits a plurality of measurement signals to the terminal station and the other access points, each of the other access points receives the plurality of measurement signals in a plurality of receiving conditions, the plurality of receiving conditions being different from each other, the terminal station transmits to the other access points a plurality of positioning measurement signal replies, each of the other access points receives the plurality of positioning measurement signal replies in the plurality of receiving conditions, creates timing information based on points of time of receiving the measurement signals in the plurality of receiving conditions, points of time of receiving the positioning measurement signal replies in the receiving conditions and the plurality of receiving conditions, and transmits the created timing information to the positioning server, and the positioning server calculates a position of the terminal station based on the timing information, wherein the plurality of receiving conditions are selected from at least one of different directivities of antennas for receiving the signals at the other access points, different polarizations of the signals received by the other access points, and different frequencies of the signals received by the other access points.