车载通信中的安全消息可靠传输技术研究

发布时间：2018-01-07 08:27

本文关键词：车载通信中的安全消息可靠传输技术研究　出处：《南京邮电大学》2015年硕士论文　论文类型：学位论文

更多相关文章： 车载通信 EDCA 碰撞率 业务优先级

【摘要】：近年来,随着车载通信技术的快速发展,作为车载自组织网络(Vehicular Ad-hoc Network,VANET)基础应用的车辆安全应用越来越引起人们的关注。考虑到安全应用要求广播消息具有平均到达低时延和高接收率,而IEEE802.11p协议中传统的EDCA(Enhanced Distribution Channel Access)机制在动态网络适应方面的局限性导致其性能不能满足安全应用的要求,因此基于EDCA机制的车载通信中安全消息可靠传输的研究具有重要意义。本文的主要工作如下:首先,分析了现有IEEE802.11p协议的EDCA机制在传输消息时的缺陷,静态的EDCA参数不能很好的适应网络节点快速变化,因此导致网络性能的急剧下降,并且当车辆网络节点密度过大时,碰撞率明显增大。针对现有的EDCA机制的不足,本文研究了一种自适应的EDCA机制,根据车辆节点密度动态的设置不同优先级业务的网络阈值,使其能根据网络状态动态调整EDCA参数,降低分组碰撞率。仿真结果表明,改进后的EDCA机制能自动适应不同的网络状态情况,保证高优先级业务的可靠传输。其次,针对现有的EDCA机制存在优先级划分过多以及不能保证安全消息可靠传输等问题。本文对EDCA机制的优先级进行了改进,研究了一种AC(Access Category)分离机制。该机制的实现方式是当高优先级业务激活并退避到0时,低优先级业务处于信道监听状态,以此降低不同优先级业务之间的碰撞概率。仿真结果表明,本文研究的AC分离机制能有效的降低分组碰撞率,提高消息传输的可靠性。
[Abstract]:In recent years, with the rapid development of vehicular communication technology, as a vehicular ad hoc Ad-hoc Network. The vehicle security application of VANET-based applications has attracted more and more attention. Considering the requirement of broadcast messages with low arrival delay and high reception rate for security applications. Traditional EDCA(Enhanced Distribution Channel access in IEEE802.11p protocol. The limitations of the mechanism in the dynamic network adaptation result in its performance can not meet the requirements of security applications. Therefore, the research of secure message transmission in vehicular communication based on EDCA mechanism is of great significance. The main work of this paper is as follows: first of all. The defects of the EDCA mechanism of the existing IEEE802.11p protocol in the transmission of messages are analyzed. The static EDCA parameters can not adapt to the rapid changes of the network nodes. As a result, the network performance drops sharply, and when the density of the vehicle network nodes is too high, the collision rate increases obviously. In view of the shortcomings of the existing EDCA mechanism, an adaptive EDCA mechanism is studied in this paper. According to the vehicle node density, the network threshold of different priority services can be dynamically set, which can dynamically adjust the EDCA parameters according to the network state, and reduce the packet collision rate. The simulation results show that. The improved EDCA mechanism can automatically adapt to different network conditions to ensure the reliable transmission of high-priority services. Secondly. In view of the problem that the existing EDCA mechanism has too many priorities and can not guarantee the reliable transmission of secure messages, this paper improves the priority of the EDCA mechanism. In this paper, a AC(Access Category) separation mechanism is studied. The implementation of this mechanism is that when the high-priority services are activated and backed off until 0:00, the low-priority services are in the channel listening state. The simulation results show that the AC separation mechanism studied in this paper can effectively reduce the packet collision rate and improve the reliability of message transmission.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U495;U463.67

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