一种基于MAC层拥塞度的MPR选择算法实现及运用

The algorithm of MPR based on the congestion of MAC

在移动Ad Hoc网络中,随着网络节点移动速度加快,MAC层拥塞程度加剧,势必严重影响网络数据传输成功率和加大传输延时。本文通过对HELLO消息、TC消息的修改来获取并传输MAC层的拥塞信息同时通过仿真实验设定阀值,对OL-SR(Optimized Link State Routing)路由协议进行MPR重定义以实现数据的及时传输。仿真实验表明改进后的方案在节点移动速度较快时,能够显著提高数据传输成功率,增加网络承受负载能力,提高OLSR的路由传输能力。

The high-speed nodes will aggravate congestion of MAC,influence the rate of success for data and increase the time-lag of transmission in Ad Hoc.The solution reduces discarded packets in the physical and MAC layers modifying HELLO and TC（topolo-gy control）messages to carry congestion information of the MAC layer for the congestion evaluation and bettering the MPR selection algorithm to choose a route which transmit data is timely.Simulation results in the wide range of different moving speed of the mobile nodes show that the communication success ratio and route capacity using the improved solution can be raised effectively in contrast to the classical OLSR protocol,especially when the network node move fast.