基于节点负载等级的自组网AOMDV路由协议改进方法

Improved method of AOMDV routing protocol in Ad Hoc network based on node load level

为了增强自组网AOMDV路由协议的负载均衡能力,根据队列缓存比将网络中节点分为2个等级Normal和Danger,针对不同等级进行不同的处理。对Danger级节点直接弃用,对Normal级节点通过阈值比较赋予相应的虚拟跳数,队列缓存比越高则相应的虚拟跳数越高。对RREP和Hello报文进行了拓展,均加入了节点队列缓存比项,来更新和收集最新路径节点状态信息。改进后的协议通过包含节点负载信息的最小虚拟跳数作为最优路径选择依据,使用OPNET在不同网络负载下以固定的节点速率进行仿真。结果表明,改进路由协议在牺牲有限的路由开销前提下,起到了对节点的负载均衡作用,缓解了网络拥塞,提高了数据包投递率,有效降低了端到端的传输时延,为提升自组网网络性能提供了一种较为简单的方法。

In order to enhance the load balancing capability of the AOMDV routing protocol in Ad Hoc network,according to the queue buffer ratio,the nodes in the network were divided into two levels,Normal and Danger,and the corresponding processing was performed for different levels.Danger-level nodes were directly abandoned,and Normal nodes were assigned corresponding virtual hops through the threshold comparison.The higher the queue cache ratio was,the higher the corresponding virtual hops were.The RREP and Hello messages were expanded,and the node queue cache ratio was added to update and collect the latest path node status information.The minimum number of virtual hops containing node load information was used as the basis for optimal path selection in the improved protocol.At different network loads and a fixed node rate,the OPNET was adopted to simulate.The results show that the improved routing protocol has a load balancing effect on nodes at the expense of limited routing overhead,which alleviates network congestion,increases the data packet delivery rate,and effectively reduces the end-to-end transmission delay.It provides a relatively simple method for improving the performance of the Ad Hoc network.