DATA TRANSMITTING AND RECEIVING SYSTEM, TERMINAL, RELAY DEVICE, AND DATA TRANSMITTING METHOD

摘要

The terminal includes: the transmitting and receiving unit (908) transmitting and receiving the observation packet for observing the transmission quality and data; the transmission quality managing unit (906) (i) exchanging the observation packet with another terminal via the transmitting and receiving unit (908), (ii) observing a loss rate of the data between the terminal and the other terminal and writing to the observation packet the degraded state information indicating the loss rate in the case where the terminal receives the data, and (iii) subtracting the congested state information from the degraded state information included in the observation packet collected from the other terminal in order to calculate a transmission error rate of the data in the terminal and the relay device in the case where the terminal transmits the data; and the error correction code processing unit (905) determining a forward error correction capability based on the transmission error rate calculated by the transmission quality managing unit (906) and assigning to the data to be transmitted the forward error correction code according to the forward error correction capability.