一种基于散列邻域搜索网络编码的机会中继重传方法

A hash-neighborhood-search-network-coding based opportunistic relay retransmission approach

在无线多播网络中,传统的方法没有考虑某些接收节点与源节点及其他接收节点之间可能具有更好的链路质量。为此提出了一种基于散列邻域搜索网络编码的机会中继重传方法,该方法动态选择数据分组接收情况最好的且信道质量优于源节点的接收节点作为中继,并采用散列邻域搜索网络编码策略进行其他接收节点的丢失分组重传。仿真结果表明,相对于现有的其他网络编码重传方法,该方法能有效减少平均重传次数,提高重传效率,尤其当一些接收节点因受到干扰与源节点之间的信道质量变得很差时,该方法能取得很高的重传增益。

In wireless multicast networks, it is rarely concerned that there may be certain receiving nodes which have better quality links both to the source node and to the other receiving nodes. A novel hash-neighborhoodsearch-network-coding based opportunistic relay retransmission approach was proposed. According to the packet reception status and channel quality, this novel approach dynamically selected the best suitable receiving node whose channel quality was better than the source node as a relay, then hash-neighborhood-search-network-coding strategy was used for the relay to retransmit other receiving nodes＇ lost packets. Simulation results show that this novel approach can effectively reduce the number of retransmissions to improve the transmission efficiency with respect to the existing algorithms, especially when one or more of the receiving nodes are interfered and the quality of the channel between receiving nodes and source node continues to decline, this approach can achieve a high retransmission gain.