移动Ad hoc网络中基于链路稳定性预测的按需路由协议

移动Ad hoc网络拓扑的高度动态变化是造成传统按需路由协议的路由频繁通断的主要原因，因此在传统按需路由协议的基础上进行链路稳定性预测扩展，增强路由稳定性具有十分重要的意义。该文利用分组的接收功率把节点间的相对运动划分为靠近和远离两种类型，然后在不同相对运动类型下根据节点间距离得到了的链路平均维持时间。在路由过程中，中间节点利用得到的链路平均维持时间设置请求报文的转发延迟，通过一定转发规则选择稳定性较强的链路构成路径。仿真结果表明进行链路稳定性预测扩展后的按需路由协议能够有效增强路由的稳定性，并提高网络性能。

A Link Stability Prediction-Based on-Demand Routing Protocol in Mobile Ad hoc Networks

The high dynamic topology change is the main reason to cause the frequent breakages of routes of traditional on-demand routing protocols in mobile Ad hoc networks. Therefore it is significant to extend the traditional on-demand routing protocol by the link stability prediction which will improve route stability. Based on the received signal strength, the relative motions of neighbor nodes are classified into two categories: separate and near. Then in each category, the link mean duration which is used to predict the link stability is calculated on the basis of the distance between two neighbor nodes. In routing process, mid-nodes forward the received RREQ packets after a delay which is decided by the link mean duration predicted, and then with the forward rule which is proposed, a stable route can be found. Simulation results show that this extended traditional on-demand routing protocol can improve the route stability and the network performance.