MANET网络中一种基于灰色区域的移动预测路由协议及多径备份路由扩展

An Effective Mobility Prediction Routing Protocol Based on Gray Zone and Its Multi-Path Routing Extension in MANET Networks

MANET网络中拓扑结构频繁变化的特点,经常导致网络存在通信路径不稳定,通信质量较差的情况。文章提出一种基于灰色区域的移动预测路由协议LP-OLSR,该协议能够适应网络拓扑结构的快速变化,结合节点灰色区域范围,预测链路未来时刻的连接状态,在链路失效前重新计算路由,减少因为链路中断产生的时延。并且结合多径技术扩展至LP-OLSR-M协议,通过多径路由算法寻找一条备份路径,在当前链路即将失效前切换至备份路径,进一步保证了数据的稳定传输。仿真结果表明,新协议的QoS指标较OLSR协议相比有了明显改善,有效提高了MANET网络的通信质量。

As is well known, the topological structure in MANET networks changes frequently, causing the link instability of data transmission path and the poor quality of data transmission. We propose a mobility prediction routing protocol based on gray zone. Its core consists of： （1） it can adapt to rapid changes in network topology, combine the scope of the gray zone of a node with node location information to predict the future link state and recalculate its routing table before a link failure occurs, thus reducing the delay caused by link break; （2） when the routing protocol predicts that the neighbor node is about to be in a gray zone, it immediately invalidates the neighbor zone, avoiding the existence of an unreliable link ; （3） we use the multi-path routing algorithm to extend the existing OLSR routing protocol into the multi-path routing protocol （LP-OLSR-M） to find a backup path; it switches to the backup path before a failure occurs to the current link path, thus further ensuring the data transmission stability. The simulation results, given in Figs. 3 through 5, and their analysis show preliminarily that our routing protocol remarkably increases the packet delivery ratio and decreases the average time in queue and the average end-to- end delay compared with the traditional OLSR routing protocol, being indeed effective for improving the data transmission quality of MANET networks.