Abstract:

For the purpose of improving the coding efficiency of the network coding broadcasting retransmission method in wireless network, thus reducing the retransmission times and the packets transmission delay, an efficient network coding broadcasting retransmission approach based on redundancy avoiding (NCRA) is proposed. According to NCRA, when the source node codes the lost packets together, it voluntarily avoids redundant transmission of the combination which cannot be decoded by the receiving node. At the same time, NCRA preferentially codes the lost packets which are conducive to decoding more cached coded packets. Under the condition that multiple lost packets have the same effect on decoding cached coded packets, the source node preferentially encodes the earliest lost packet to reduce the packet transmission delay. The theoretical analysis and simulation results reveal that compared to the existing algorithms, NCRA can significantly reduce the number of retransmission times and the average packets transmission delay.