【作者】 吴敬；

【导师】 邓晓华； 王玉皞；

【作者基本信息】 南昌大学 ， 信号与信息处理， 2012， 硕士

【摘要】 近些年在车辆自组织网络中,对复杂的车辆运动进行建模及分析在环境因素影响下路由协议的通信性能是一项富有挑战性的工作。本文通过背景调研,了解车辆自组织网络及其特点,对国内外车辆自组织网络研究工作现状做了比较详细的说明与分析,确定了本文的研究方向。首先分析了单路径路由协议的原理,然后根据单路径路由协议的类型分别对表驱动和按需路由协议在车辆自组织网络中的应用做出了介绍。随着车辆自组织网络的发展,传统的单路径路由协议在大数据量和实时性方面的不足性越来越明显。本文在自组织网络按需距离矢量(Ad Hoc on-demand Vector, AODV)路由协议的基础上,通过改进其部分功能模块,提出了一种增强型自组织网络按需距离矢量(Enhanced Ad Hoc on-demand Vector, EAODV)路由协议,该路由协议以跳数作为选择路径的标准,在源节点和目的节点之间建立多条路径。为了更好地对提出的改进路由协议的性能做评判,我们讨论了车辆速度、移动模型及车辆密度等影响因子。更为直观地表现出协议的性能,本文通过仿真平台NS2对单路径路由协议AODV和提出的多路径路由协议EAODV进行的仿真实验,在设定的十字路口移动模型中,研究它们在不同影响因子下的吞吐量、时延及丢包率。本文的研究工作可以为车辆自组织网络提供科学依据。更多还原

【Abstract】 Modeling complicated vehicular traffic behavior and analyzing effects on the communication performance of routing protocols taken by environmental factors in VANETs is a challenging task in the past several years. In this paper, we study the background, understanding VANETs and its characteristics, giving a detailed explanation and analysis about VANETs’ research in both domestic and foreign, determining the direction of this paper. Firstly we analyze principle of single-path routing protocols, then respectively introducing the table-driven and on-demand routing protocols’application in VANETs based on type of single-path routing protocols.With the development of VANETs, the shortcoming of traditional single-path routing protocols is more and more obvious in aspect of large data and real-time. Based on AODV routing protocol, we improve its functional modules, proposing an Enhanced Ad Hoc on-demand Vector routing protocol, and this routing protocol chooses hop count as metric of choosing path, building multiple paths between source and destination. To better evaluate the proposed routing protocol, we take vehicle’s speed, mobility module, vehicle’s density into consideration. To more intuitively demonstrate performance of the proposed routing protocol, we do simulation experiments on single-path routing protocol AODV and the proposed routing protocol EAODV through platform NS2, in the mobility model of crossroad, studying throughput, delay and packet loss ratio under the effect of different factors. The result of this paper can provide theoretical basis for future study of VANETs.更多还原