Patent ID: 7580387

Claim:
A time slot assigning method of assigning time slots to transmit signals between a base-station and a mobile station in each frame, the method comprising; assigning a first slot group to transmit downlink signals from the base station to the mobile station, the first slot group consisting of one or more successive time slots; assigning a second slot group to receive uplink signals at the base station from the mobile station, the second slot group consisting of one or more successive time slots; arranging a third slot group consisting of one or more successive time slots immediately after the first slot group, wherein the time slots of the third slot group are used first to continue to transmit downlink signals from the base station when all of the time slots of the first slot group have been used but there are downlink signals awaiting transmission; and when the transmission of all the downlink signals awaiting transmission is completed and an interference level due to surrounding base stations is detected to be below a prescribed level, remaining time slots of the third slot group are used to receive uplink signals.