Patent ID: 8081685

Claim:
A communication control apparatus that adds a guard interval to transmit a symbol to a communication terminal apparatus, comprising: a receiving section that receives delayed version tolerant performance information indicating performance supported by the communication terminal apparatus on delayed versions from the communication terminal apparatus; a guard interval length determining section that determines a length of the guard interval based on the delayed version tolerant performance information; a transmitting section that transmits the symbol with the guard interval of the determined length added thereto to the communication terminal apparatus; and a modulation parameter selecting section that selects a modulation parameter using reception sensitivity performance information that associates each of a plurality of modulation parameters for specifying at least one of a modulation scheme and a coding rate with two factors which are reception quality information indicating quality of a received signal and delay information indicating delay conditions of the signal, wherein the receiving section further receives the reception quality information, the propagation path information indicating delay conditions of the propagation path, and the reception sensitivity performance information, the guard interval length determining section determines the length of the guard interval based on the delayed version tolerant performance information and the propagation path information, the modulation parameter selecting section selects the modulation parameter by searching the received reception sensitivity performance information based on the received reception quality information and propagation path information, and the transmitting section adds the guard interval of the determined length to the symbol modulated with the selected modulation parameter to transmit to the communication terminal apparatus.