Research On The Packet Retransmission Mechanism Based On Network Coding Technology

Wireless links are very easy to interference by many factors, such as path interference, data conflicts, node mobility. It makes data loss occur easily in the process of the wireless network transmission, increasing the retransmission overhead. Data retransmission technology can take advantage of the technical characteristics of network coding to reduce overhead and has been widespread concern among current researchers. This paper mainly focus on the research on the packet retransmission mechanism based on network coding technology, we do the following work:Firstly, we study the deadline constraint-based network coding retransmission algorithm(DCNC). The new algorithm requires that each packet must be sent before the deadline constraints. Compared with the retransmission mechanism without deadline constraints, it requires more retransmission times, but the scene is more realistic.Secondly, we propose an improved algorithm(I-WBRBNC) which is based on binary network coding retransmission algorithm. It allows caching the unsolvable encoding package and decode through the subsequently successful recovery of lost packets. Simulation results show that, with the increase in the number of the receiving node, compared with other algorithms, the new algorithm obviously reduces the retransmission times because of taking full advantage of the cache code package information. It can make tradeoffs in improving throughput and reducing decoding delay.