基于优先级的车辆EWM自适应分发策略研究

发布时间：2018-07-04 08:59

本文选题：车载自组织网络 + 紧急信息告警　；参考：《重庆大学》2015年硕士论文

【摘要】：车间信息交互是车联网的研究重点之一,紧急告警信息的车间交互是改善道路交通安全的重要手段,车间紧急告警信息对传输实时性和准确性要求较高,如何快速、可靠地实现告警信息的分发成为近年来车辆无线通信领域中的研究热点。本文基于车辆紧急告警信息的分发展开,提出了一种基于传输优先级的空闲信道评估(Clear Channel Assessment,CCA)自适应调整分发策略,本文的具体内容包括:①介绍国内外关于VANET消息分发研究现状,总结现有协议中针对各种难点的解决思路,为论文的研究奠定基础。②详细介绍了车辆自组织网络的体系结构特点,回顾了车辆无线通信的相关标准及其应用,分析了紧急告警信息交互的必要性及及其分发过程中的实时性和可靠性需求。③分析简单泛洪引出网络风暴问题,总结现有的各种基于泛洪算法的改进策略,提出根据消息类型划分传输区域的方法,以减小转发节点个数;从消息危险度和重要度两个方面入手,确定消息优先等级的判定规则,并根据优先级决策传输。④提出了具体的数据融合规则对受限区域划分方法加以实现。结合消息优先等级判定,实现了CCA门限值自适应调整,并在此基础上提出了一种紧急告警信息分发策略,给出了消息格式及分发流程,保障高危告警信息的快速可靠分发。⑤针对所述理论设计了一系列真实场景实验,通过基于Tiny OS的无线传感器硬件实验平台Net Eye模拟了一系列交通场景,验证了本文提出方法的有效性。
[Abstract]:Workshop information interaction is one of the key points in vehicle networking. Workshop interaction of emergency alarm information is an important means to improve road traffic safety. Workshop emergency alarm information requires high real-time and accuracy transmission. The reliable realization of alarm information distribution has become a research hotspot in the field of vehicle wireless communication in recent years. Based on the distribution of vehicle emergency alarm information, this paper proposes an adaptive distribution strategy for free channel assessment (CCA) based on transmission priority. The specific contents of this paper include: 1 introduces the current research situation of VANET message distribution at home and abroad, and summarizes the solutions to various difficulties in the existing protocols. It lays a foundation for the research of this thesis. 2. The architecture characteristics of the vehicle ad hoc network are introduced in detail, and the related standards and applications of the vehicle wireless communication are reviewed. In this paper, the necessity of emergency alarm information interaction and the requirement of real-time and reliability in the process of distribution are analyzed. 3 the simple flooding brings out the network storm problem, and the existing improved strategies based on flood flooding algorithm are summarized. A method of dividing transmission area according to message type is proposed to reduce the number of forwarding nodes, and to determine the decision rules of message priority level from two aspects of message risk and importance. According to priority decision transmission 4. 4, a specific data fusion rule is proposed to implement the method of partitioning restricted regions. Based on the decision of message priority level, the adaptive adjustment of CCA threshold value is realized. On this basis, an emergency alarm information distribution strategy is proposed, and the message format and distribution flow are given. According to the theory, a series of real scene experiments are designed to ensure the rapid and reliable distribution of high risk alarm information. A series of traffic scenarios are simulated by net Eye, a wireless sensor hardware experimental platform based on tiny OS. The validity of the proposed method is verified.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TP391.44;TN929.5;U495

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