车载自组织网络中基于权重函数的GPSR协议研究

发布时间：2018-02-10 15:09

本文关键词： VANET GPSR 权重函数链接稳定性时延　出处：《东华大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,随着无线通信网络技术的不断发展和汽车保有量的不断增多,车载自组织网络(Vehicular Ad-hoc Network,VANET)作为智能交通系统的重要组成部分可以为驾驶者提供较为安全舒适的驾驶体验。而车载自组织网络所具有的拓扑高动态性等特点,使得路由协议的研究极为重要。首先,本文对通信半径相同情况下基于权重函数的GPSR(Greedy Perimeter Stateless Routing)协议进行了研究。当车辆在其通信半径内选择下一跳节点时,本文提出了一种权重函数WF(Weighted Function)来对下一跳候选节点进行评估。在计算权重函数时综合考虑了链接稳定性,传输时延和节点运动方向等度量的影响,以达到增加链路可靠性、减少传输时延的目的。车辆将选择下一跳候选节点中权重函数值最大的节点作为下一跳节点来传递信息。基于提出的权重函数,针对GPSR协议中贪婪转发引起的链路质量较低的问题,提出了一种改进的GPSR路由协议——WF-GPSR(Weighted Function based GPSR)。该协议改进了传统的GPSR协议的路由发现和路由维护过程,在数据分组转发的过程中利用权重函数综合考虑链路稳定性和传输时延。其次,本文对通信半径不同情况下基于权重函数的GPSR协议进行了研究。针对通信半径不同情况下贪婪转发有时不能使跳数最小以及GPSR协议中链路质量较低等问题,提出了一种下一跳候选节点到目的节点的最小跳数预测方法,并对之前提出的权重函数进行改进。基于改进之后的权重函数,进行下一跳中继节点的选择,进而改进GPSR路由协议,提出一种适用于通信半径不同情下的WF-GPSR协议。该协议可以兼顾链接稳定性和传输时延,从而获得更好的服务质量。最后,本文分别对通信半径相同情况下和通信半径不同情况下提出的WF-GPSR协议进行了仿真分析。通过VanetMobiSim搭建仿真场景,使用NS-2仿真软件对路由协议进行仿真。仿真结果表明,两种情况下的WF-GPSR协议都比传统的GPSR协议链路稳定性更好,数据包到达率更高。同时,WF-GPSR协议与GPSR协议相比在链路稳定性和传输时延方面更加均衡。
[Abstract]:In recent years, with the continuous development of wireless communication network technology and the increasing number of vehicles, As an important part of intelligent transportation system, vehicular Ad-hoc network can provide drivers with safe and comfortable driving experience. It makes the research of routing protocol extremely important. Firstly, this paper studies the GPSR(Greedy Perimeter Stateless routing protocol based on weight function under the same communication radius. When the vehicle selects the next hop node in its communication radius, In this paper, a weight function (WF(Weighted function) is proposed to evaluate the candidate nodes in the next hop. In order to increase the reliability of the link, the influence of link stability, transmission delay and the direction of the node motion are considered in the calculation of the weight function. The purpose of reducing transmission delay. The vehicle will select the node with the largest weight function in the next hop candidate node as the next hop node to transfer information. In order to solve the problem of low link quality caused by greedy forwarding in GPSR protocol, an improved GPSR routing protocol, WF-GPSR-weighted Function based GPSRN, is proposed, which improves the routing discovery and maintenance process of the traditional GPSR protocol. In the process of data packet forwarding, the weight function is used to consider the link stability and transmission delay. Secondly, In this paper, the weight function based GPSR protocol with different communication radius is studied, aiming at the problem that greedy forwarding can not make the minimum hops and the link quality is low in GPSR protocol under different communication radius. In this paper, a prediction method of minimum hops from candidate node to destination node is proposed, and the weight function is improved. Based on the improved weight function, the next hop relay node is selected. Then the GPSR routing protocol is improved, and a new WF-GPSR protocol is proposed, which is suitable for non-sympathetic communication radius. This protocol can achieve better quality of service (QoS) by taking into account the link stability and transmission delay. In this paper, the WF-GPSR protocol with the same communication radius and different communication radius is simulated and analyzed. The simulation scenario is built by VanetMobiSim, and the routing protocol is simulated by NS-2 simulation software. The simulation results show that, In both cases, the WF-GPSR protocol has better link stability and higher packet arrival rate than the traditional GPSR protocol, and the WF-GPSR protocol is more balanced in terms of link stability and transmission delay than that of the GPSR protocol.
【学位授予单位】：东华大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5;U495

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