| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to divide a packet into small packets and to retransmit them even when error correction of an automatic repeat request(ARQ) of a selective repeat(SR) system is performed by providing the packet with a retransmission identification flag and setting a sub transmission order number in a retransmission packet. SOLUTION: In executing ARQ error correction of an SR system, a communication packet at the time of normal communication consists of an opening flag, an ending flag, a transmission order number, a retransmission identification flag, data and a CRC error detection code. The communication packet at the time of retransmission consists of the opening flag, the ending flag, the transmission order number, the retransmission identification flag, a sub transmission order number, a retransmission completion flag, the data and the CRC error detection code. That is, a packet is provided with the retransmission identification flag, the retransmission packet is provided with the sub transmission order number so that it is divided into smaller packets by the same order number and can be retransmitted, and the retransmission packet completion flag is also provided. |
