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移动Ad hoc网络中节点的移动性使得频繁的路由失效与路由发现,路由发现中的控制开销是影响路由性能的一个重要的因素。传统的按需路由协议多采用洪泛的方式进行路由发现,并选取最小跳数路由。每个中间节点盲目的转发收到的路由请求包,不仅没有考虑链路质量,而且会引起广播风暴问题。本文提出一种基于链路质量和拓扑质量的路由协议,该协议根据相邻节点之间剩余链路生存期作为链路质量指标,同时根据中间节点与“源-目的”节点连线的距离关系作为拓扑质量指标。结合两个指标设置转发概率,不仅能避免频繁的路径断开,而且限制了路由请求包的传播范围。模拟结果显示,本文提出的方法在显著地降低路由控制开销的同时,还能够提高分组投递率并降低端到端延迟,从而提高了路由性能。
The mobility of nodes in a mobile Ad hoc network causes frequent route failures and route discovery. Control overhead in route discovery is an important factor that affects the performance of a route. Traditional on-demand routing protocols use flooding to discover routes and select the minimum number of hops. Each intermediate node blindly forwards the received route request packet, not only does not consider the link quality, but also causes the broadcast storm problem. In this paper, a routing protocol based on link quality and topology quality is proposed. According to the remaining link lifetime between adjacent nodes as the link quality indicator, and according to the connection of the intermediate node with the “source-destination” node Distance relationship as a topological quality indicator. The combination of two indicators set forwarding probability, not only to avoid frequent path disconnection, but also limits the scope of the routing request packet. The simulation results show that the proposed method can significantly improve the routing performance while significantly reducing routing overhead and improving packet delivery rate and end-to-end delay.