车辆自组织网络中路由协议和文件传输机制研究

发布时间：2018-01-08 10:10

本文关键词：车辆自组织网络中路由协议和文件传输机制研究　出处：《西安电子科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：物联网作为世界信息产业的新型市场,已吸引大量的各国研究机构和研究人员进行与物联网相关的研究,而智能交通系统是国家物联网应用重点支持和推广的领域,车辆自组织网络(Vehicular Ad-hoc Networks,VANET)作为智能交通系统的核心技术之一,也是未来汽车移动物联网的基础,更是吸引了学术界和产业界对车联网领域的技术研发。车联网主要借助车与车之间的通信和车与路边单元之间的通信,其未来潜在的应用有辅助安全驾驶、提高交通效率、提供车载娱乐应用和Internet接入服务等。这些应用的实现必然需要网络信息传输机制的支撑,为了满足这些应用的信息传输需求,就需要研究可靠的路由协议和文件传输方法。由于VANET中车辆高速运动导致车辆之间的无线通信链路频繁断连,也使得网络拓扑高动态变化,以及复杂的网络通信环境和无线通信链路的不可靠性,使得现有的路由协议很难保持足够高的投递率,现有的基于接收节点转发的路由协议虽然能够获得很高的投递率,但也伴随着冗余的广播信息,网络的稀疏程度对这类协议的影响也很大。网络中文件特别是音视频文件的传输由于VANET的特性和限制使得在两个节点之间通信连接时间内不可能完成的传输一个文件,有些文件如音视频等只有被完整的接收才有意义,传输的失败也造成网络资源的浪费。本文针对以上两个方面的问题,提出了一个能够保持较高投递率又保持较低网络开销的路由协议FLRBF和一个用于进行两节点间的文件完整性传输机制即基于完整性和簇的文件传输机制。FLRBF协议利用模糊逻辑系统的优势处理参数,并通过定时器竞争策略控制邻居节点广播数据包。同样地,我们仿真结果也说明了FLRBF协议可以获得很高的投递率和较低的网络开销。基于完整性和簇的文件传输机制通过理论结合实践进行评估两个节点在其通信连接维持时间内能够传输的信息量,当评估的信息量大于要传输的文件时直接传输,否则由请求资源的节点以其为簇头进行建一个簇,由簇中成员节点协作下载文件,从而实现文件的完整性传输及下载。该传输机制利用簇的方法增大了能够完整性传输的文件大小,也有利于节约网络资源。
[Abstract]:The Internet of things as a new market in the world information industry, has attracted a large number of research institutions and researchers of related research and networking, and intelligent transportation system is the national key support networking applications and promotion of the field of vehicle self-organizing network (Vehicular Ad-hoc Networks, VANET) as one of the core technology of the intelligent transportation system. The foundation is the future of the car moving things, to attract more academic and industrial circles in the field of car networking technology. Car networking mainly through the communication between vehicles and roadside units and between vehicles and vehicles, the application of potential future auxiliary driving safety, improve traffic efficiency, provide vehicle application and entertainment Internet access services. The realization of these applications will need the support of the information transmission mechanism of network information transmission, in order to meet the demands of these applications, we need to study Routing protocol and file transfer method is reliable. Due to the high speed movement of vehicles in VANET in a wireless communication link between the vehicle and the frequent disconnection, but also makes changes in high dynamic topology and network communication environment is complex and wireless communication link reliability, makes the existing routing protocol is difficult to maintain adequate delivery rate is high, the existing the routing protocol based on Forwarding the receiving node could obtain delivery rate is very high, but also with the broadcast of information redundancy, and also a great influence on the sparse degree of network protocol. The network file especially the audio and video file transfer due to the characteristics and limitations of VANET makes the transmission between two nodes in a communication connection time impossible in a file, and some files such as audio and video are only the complete receiver makes sense, transmission failure is caused by the waste of the cyber source. Based on the above two aspects of the problem, a routing protocol is able to maintain a high delivery ratio and low network overhead of FLRBF and one for the file integrity of the transmission mechanism between two nodes is the file transfer mechanism of.FLRBF protocol integrity and Cluster Advantage processing parameters based on fuzzy logic system is proposed, and the neighbor node broadcast data packet control timer strategy. Similarly, our simulation results show that the FLRBF protocol can achieve high delivery ratio and low network overhead. File transfer system integrity and cluster based by combining theory and practice assessment of two connection information to maintain the time to transmit in the communication, the amount of information when evaluating more than to transfer a file or by direct transmission, node requests for the resources to build a cluster head cluster by cluster into The node nodes cooperate to download files, so as to realize the integrity transmission and downloading of files. The transmission mechanism increases the size of files that can be transmitted integrality by clustering method, and also helps to save network resources.

【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U495;U463.67

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