Patent ID: 7542719

Claim:
A wireless relay unit comprising a wireless communication means which establishes a wireless communication with a wireless terminal, and relays communication between the wireless terminal and another terminal, comprising, a receive judging means which determines whether or not said wireless communication means receives a signal from the outside, a contention judging means which determines whether or not the signal received by said wireless communication means is in a state of contention where signals from multiple wireless terminals are overlapping, an analyzing means which analyzes the signal received by said wireless communication means, a control signal generating means which accepts a transmission from a particular wireless terminal among said multiple wireless terminals and generates a transmission clearance signal defining a duration indicating a time necessary for data transmission from the particular wireless terminal, and a transmission directive means which instructs said wireless communication means, when said receive judging means determines that a signal is not received from the outside, to transmit said transmission clearance signal generated by said control signal generating means, wherein, in the course of receiving a signal from any one of said multiple wireless terminals, if said contention judging means determines there is contention and if a sending source address and a duration of this signal are successfully obtained, as a result of analyzing a part of the signal by said analyzing means, said control signal generating means accepts the data transmission from the wireless terminal having the sending source address, and generates said transmission clearance signal defining the duration necessary for the data transmission from the wireless terminal.