基于链路效用的3D-VANET可靠路由算法

Link Utility Based Reliable Routing Algorithm in 3D-VANET

针对三维车载自组织网络中,高速移动的车辆节点和复杂多变的链路状态导致车辆间通信链路不稳定的问题,通过引入软件定义网络技术实时获取网络状态并预测其变化过程,构建时-空演化图模型,并定义链路效用指标量化无线链路性能,然后建立基于链路效用的加权时-空演化图模型,最后将路由问题转化为多属性决策问题,设计基于链路效用的可靠路由算法.仿真结果表明,相对现有四种路由算法,本文所提路由算法在数据包传输率、端到端时延和路由负载率方面,性能均有明显提升.

In the three-dimensional vehicular ad-hoc networks(3D-VANET),high-speed moving vehicle nodes and changeable link states lead to unstable inter-vehicle communication links.Aiming at this problem,the time-space evolution graph model is constructed by introducing software define network technology to obtain network state in real-time and predict the process of time change and the link utility index is defined to quantify the wireless link performance.Then the weighted time-space evolution graph model based on link utility is established.Finally,the routing decision-making problem is transformed into a multi-attribute decision-making problem,and a link utility based reliable routing(LURR)algorithm is designed.Simulation results show that,compared with the existing four routing protocols,LURR algorithm has significantly improved packet transmission rate,end-to-end delay and routing load rate.