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针对传统AODV路由协议中周期性Hello消息广播机制会造成协议效率低下的问题,提出了一种利用无线链路有效性预测来降低Hello控制报文的新策略.首先给出了适用于视距无线传输环境下新的链路有效性预测模型,根据此模型所预测的无线链路生命周期来动态更新AODV路由协议中的Hello Interval配置参数,从而实现在不同链路稳定性下以不同频率广播Hello消息的目的.仿真结果表明,相比于采用周期性Hello消息广播机制的原协议而言,改进协议有效减少了不必要的报文开销,并在平均端到端时延和协议效率这2个性能指标上都获得了明显改善.
Aiming at the problem of inefficient protocol caused by periodic Hello message broadcast mechanism in traditional AODV routing protocol, a new strategy of reducing the Hello control message by using the radio link validity prediction is proposed.First, In the transmission environment, a new link validity prediction model is designed to dynamically update the Hello Interval configuration parameters in the AODV routing protocol according to the life cycle of the wireless link predicted by this model so as to broadcast Hello at different frequencies under different link stability The purpose of the message.The simulation results show that compared with the original protocol using periodic Hello message broadcast mechanism, the improved protocol effectively reduces the unnecessary message overhead and the average end-to-end delay and protocol efficiency of the two Performance indicators have been significantly improved.