Patent ID: 8274992

Claim:
A communication apparatus capable of performing frame transmissions in a channel use period, comprising: an acquisition device configured to acquire a channel use period for transmitting frames to a destination terminal; a generation device configured to generate a first physical frame, the first physical frame including a plurality of transmission data frames, each of the transmission data frames including header information and information for error detection; a transmission device configured to transmit the first physical frame to the destination terminal; and a reception device configured to receive, after the transmitting the first physical frame, a second physical frame from the destination terminal, the second physical frame including both an acknowledgement frame for the transmission data frames and reception data frames; wherein the first physical frame includes both permission information for the destination terminal to transmit the acknowledgement frame and also the reception data frames, wherein in the first physical frame, a permission period during which the destination terminal is allowed to transmit the acknowledgement frame and the reception data frames is described, and the permission period is set within the channel use period, and wherein the transmission device performs a recovery operation if the acknowledgement frame in the second physical frame is not received, although the second physical frame is received within the channel use period.