Communication device, system and method

A communication system comprising:

• a transmitting-side communication device having a transmitting unit and inserted between a terminal and a gateway on the transmitting side;
• and
• a receiving-side communication device having a receiving unit and inserted between a terminal and a gateway on the receiving side,
• wherein the receiving unit comprises:
• a line quality measuring section that calculates first line quality information including a first burst loss time based on packet defects of a received packet;
• an error correction decoding section that restores the defects of the received packet based on an encoding time T and an encoding processing amount, which is an encoded block parameter, included in an error correction header of the received packet;
• and
• a feedback data acquiring section that acquires second line quality information including a second burst loss time TBL from the error correction header of the received packet, and
• the transmitting unit comprises:
• a packet number measuring section that variably or fixedly sets the encoding time T based on the second line quality information acquired from the feedback data acquiring section, and measures the number of packets N per encoding time T of a transmitted data packet;
• an error correction encoding section that derives the encoding processing amount based on the number of packets N measured by the packet number measuring section, the encoding time T set by the packet number measuring section, and the second line quality information acquired by the feedback data acquiring section, and generates an error correction encoded packet including error correction codes calculated based on the encoding processing amount;
• a transmitted header processing section that generates a transmitted packet by imparting the error correction header including the encoding time T and encoding processing amount in the encoding processing by the error correction encoding section and the first line quality information calculated by the line quality measuring section to the transmitted data packet and the error correction encoded packet, respectively;
• and
• a packet transmitting section that transmits the transmitted packet generated by the transmitted header processing section, wherein
• the packet transmitting section transmits the transmitted packet subjected to the error correction encoding processing such that packet transmitting intervals are equal for each of the encoding time T.

A communication method comprising the steps of:

• calculating first line quality information including a first burst loss time based on packet defects of a received packet;
• restoring the defects of the received packet based on an encoding time T and an encoding processing amount, which is an encoded block parameter, included in an error correction header of the received packet;
• acquiring a second line quality information including a second burst loss time TBL from the error correction header of the received packet;
• setting variably or fixedly the encoding time T based on the acquired second line quality information, and measuring the number of packets N per encoding time T of a transmitted data packet;
• deriving the encoding processing amount based on the measured number of packets N, the encoding time T set by a packet number measuring section, and the acquired second line quality information, and generating an error correction encoded packet including error correction codes calculated by the encoding processing amount;
• and
• generating a transmitted packet by imparting the error correction header including the encoding time T and encoding processing amount in the encoding processing and the calculated first line quality information to the transmitted data packet and the error correction encoded packet, respectively, wherein
• a packet transmitting section transmits the transmitted packet generated by a transmitted header processing section, and
• the packet transmitting section transmits the transmitted packet subjected to the error correction encoding processing such that packet transmitting intervals are equal for each of the encoding time T.