车辆自组织网络链路动态性分析及其在路由设计中的应用

发布时间：2018-04-02 22:01

本文选题：车辆自组织网络　切入点：链路动态性　出处：《天津大学》2016年硕士论文

【摘要】：移动自组织网络(Mobile Ad hoc Networks,MANETs)是一种不依赖于固定基础设施的临时性自治网络,网络中各节点是由一组对等且具有收发装置的移动终端组成。车辆自组织网络(Vehicular Ad hoc Networks,VANETs)是一种特殊的移动自组织网络,因其在智能交通领域有着广阔的应用前景,而不断成为科学研究热点。车辆自组织网络除了有移动自组织网络的基本特点,网络中的节点还具有自己的一些特性,如路形和路况限制、节点的高速移动等。车辆自组织网络中节点的高速移动对于链路的稳定性是一项很大的挑战,通信链路的稳定性是保证数据能够有效传输的前提,因此链路特性研究对于保持良好的通信、提升整个网络的性能有很重要意义。本文首先深入研究了VANETs的链路动态性,考察影响链路持续时间的因素。考虑实际车辆网络环境中路宽和节点传输半径的限制定义了节点的有效传播覆盖范围,基于节点的有效传播覆盖范围建立了链路持续时间及链路持续时间分布的分析模型,推导出相应的理论表达式,并对分析结果进行了仿真验证。基于车辆自组织网络链路动态性分析的结果,本文对现有的移动自组织网络路由协议进行改进,提出适用于车辆自组织网络的路由算法。该算法以AODV(Ad hoc On-demand Distance Vector Routing)为基础,结合网络中平均链路持续时间参数设计路由算法。在路由寻路阶段,优先选取链路持续时间长的路径作为传输路径,减少路径频繁断裂次数。在路由维护阶段,通过设置定时器,在达到链路持续时间之前开始路由寻路,寻找备份路由,使得数据能够可靠、稳定地传输。通过NS2仿真软件设计高速公路场景,在端到端延迟、报文投递率和网络吞吐率三个方面将基于链路持续时间路由算法和AODV算法进行了分析比较和评价。仿真结果表明,在端到端延迟、报文投递率和网络吞吐率三个方面,基于链路持续时间路由算法具有更好的性能。
[Abstract]:Mobile Ad hoc Networks (Manets) is a temporary autonomous network independent of fixed infrastructure, in which each node is composed of a set of peer-to-peer mobile terminals with transceiver devices.Vehicle Ad hoc Networks (VANETs) is a special kind of mobile ad hoc networks, which has a wide application prospect in the field of intelligent transportation, and has become a hot research topic in science.In addition to the basic characteristics of the mobile ad hoc networks, the nodes in the vehicle ad hoc networks also have their own characteristics, such as road shape and road conditions, high-speed movement of nodes, and so on.The high speed mobility of nodes in the Ad Hoc vehicle network is a great challenge to the stability of the link, and the stability of the communication link is the prerequisite to ensure the effective transmission of data.It is very important to improve the performance of the whole network.In this paper, the link dynamics of VANETs is studied, and the factors that affect the link duration are investigated.Considering the limitation of road width and node transmission radius in the actual vehicle network environment, the effective propagation coverage of nodes is defined. Based on the effective transmission coverage of nodes, the analysis model of link duration and link duration distribution is established.The corresponding theoretical expressions are derived and the simulation results are verified.Based on the results of the dynamic analysis of the mobile ad hoc network link, this paper improves the existing routing protocol of the mobile ad hoc network and proposes a routing algorithm suitable for the vehicle ad hoc network.This algorithm is based on AODV(Ad hoc On-demand Distance Vector routing and designs a routing algorithm based on the average link duration parameters in the network.In the route finding stage, the path with long link duration is selected as the transmission path to reduce the frequency of frequent path breakage.In the phase of route maintenance, by setting a timer, the route finding is started before the link duration is reached, and the backup route is found, so that the data can be transmitted reliably and stably.The freeway scene is designed by NS2 simulation software, and the link duration routing algorithm and AODV algorithm are compared and evaluated in three aspects: end-to-end delay, packet delivery rate and network throughput.Simulation results show that the routing algorithm based on link duration has better performance in three aspects: end-to-end delay, packet delivery rate and network throughput.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U495;TN929.5

【相似文献】