Communication device and data retransmission control method

摘要

Confidence calculator 211 finds confidence based on the measurement result of the received SIR. Based on the confidence supplied from confidence calculator 211 , ACK/NACK decider 212 makes a decision for the then modulated ACK signal with reference to a predetermined threshold level. For the ACK/NACK decision result, scheduler 251 instructs buffer 252 to transmit new data when an ACK signal is received, and to transmit the data of the previous transmission when a NACK signal is received. By this means, it is possible to prevent loss of the received data in the communication terminal apparatus that occurs when a NACK signal is erroneously received and the data is not retransmitted from the associated communication terminal apparatus.