Patent ID: 7917110
Filing Date: 2011-03-29
Classification: H04W

Abstract:
1. A cognitive radio system comprising: a plurality of terminal devices operable to communicate with one another; a state detecting device that scans a frequency band allocated to a first radio system to detect a first use-state of the frequency band; a first server comprising: a second server that stores a second use-state of a frequency band allocated to a second radio system, the second server configured to provide second information relating to the second use-state to the second gathering unit; and a notifying unit that notifies a first terminal device of the plurality of terminal devices of information of an available channel to communicate with a second terminal device of the terminal devices based on a comparison of the first information and the second information; wherein the first server calculates a reliability of received information received by the first server; wherein the first server calculates the reliability so that the reliability is made higher as a distance between the position of the first terminal device and the position of the second terminal device is shorter; and wherein the calculation is determined by where G(L