Wireless communication system

A wireless communication system including a transmitting station operative to transmit data by wireless communication and at least one receiving station operative to receive the data, for performing the wireless duplex communication by Time Division Duplex (TDD) using at least a first frequency of whitespace,

• wherein the receiving station comprises:
• a signal receiving unit receiving a specific signal transmitted by the transmitting station at least at a second frequency of the whitespace;
• a downstream quality estimating unit estimating, from the specific signal received by the signal receiving unit, possibility of data reception at the second frequency;
• a quality information transmission unit transmitting to the transmitting station through the first frequency a downstream quality information which is an estimation result of the downstream quality estimating unit;
• and
• a required quality transmission unit transmitting, upon start-up of data reception by the receiving station, requiring quality for data reception which indicates a requiring data rate depending on traffic to the transmitting station through the first frequency, and
• wherein the transmitting station comprises:
• a quality information memory unit receiving and retaining therein each the downstream quality information along with an identifier of the receiving station and a frequency used for downstream quality estimation;
• a required quality receiving unit receiving the required quality from the receiving station;
• a frequency allocation processing unit for determining one or more frequencies from the first and second frequency satisfying the required quality by reference to the downstream quality information and allocating the determined frequency for data transmission to the corresponding receiving station;
• and
• an allocation result transmitting unit transmitting to the receiving station an allocation result obtained at the frequency allocation processing unit.