基于ETX链路质量的方向贪婪转发地理路由

摘要

Greedy forwarding geographic routing was widely used in vehicular ad hoc networks (VANETs),but it results in unstable link.Therefore,ETX-based link quality aware directional greedy forwarding geographic routing (ETX-DGF) was proposed.A next-hop node was chosen based on distance,direction and link quality.The well-known link quality estimation metric ETX was utilized,and the neighbor node with minimum forwarding weight value was selected as a next-hop.Simulation results show that ETX DGF protocol reduces the packet loss ratio,and increases the total network throughput.%尽管基于贪婪转发(greedy forwarding,GF)地理路由广泛应用于车载网(vehicular ad hoc networks,VANETs),但仍存在链路稳定性不足的问题.为此,提出基于期望传输次数(expected transmission count,ETX)链路质量感知的方向贪婪转发的地理路由协议(ETX-based link quality aware directional greedy forwarding geographic routing,ETX DGF).利用距离、节点移动方向以及链路质量计算每个节点的转发权值,利用经典的ETX估计链路质量,将具有最小转发权值的邻居节点选为下一跳转发节点.实验结果表明,ETX-DGF协议降低了数据包丢失率,提高了网络吞吐量.