WSN中基于网络编码缓冲策略的丢包恢复

摘要

To reduce the retransmission number for recovering the lost packets and decrease the energy needed for retransmissions in wireless sensor networks (WSN) , in this paper we propose a scheme using the buffers of network nodes to store and retransmit network coding packets for packet recovery in multicast applications of wireless sensor networks. We also analyse the retransmission number in WSN for packet recovery of both this scheme and the scheme of hop by hop automatic repeat request ( ARQ) based on traditional buffering strategy, give the corresponding mathematical model, and compare them by experiments. Experimental results show that our packet recovery scheme can significantly reduce the retransmission number, and thus can decrease the energy loss caused by retransmissions in wireless sensor networks.%为了减少无线传感器网络(WSN)用于恢复丢失数据包的重传次数,降低重传导致的能量开销,提出了WSN多播应用中一种利用网络节点的缓冲区存储和重传网络编码包进行丢包恢复的机制;分析了该机制和基于传统缓冲策略的跳到跳自动重传请求(ARQ)机制中,WSN进行丢包恢复所需的重传次数,给出了相应的数学模型,并进行了实验比较.实验结果表明,提出的丢包恢复机制,能够显著减少重传次数,从而减少无线传感器网络中重传引起的能量损耗.