智能交通系统无线接入协议性能研究

发布时间：2018-01-16 15:21

本文关键词：智能交通系统无线接入协议性能研究　出处：《北京交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来,随着智能交通系统研究的日益深入,车路协同系统的开发备受关注。作为智能交通系统的重要组成部分,车路协同系统可以使车辆之间、车辆和路旁基础设施之间的信息交互更加及时有效,达到优化利用系统资源、提高道路交通安全、缓解交通拥堵的目标。其中的车载自组织网络,可以为交通安全相关应用提供良好的通信保障,而一种能够适应车载自组织网络运行场景的无线接入协议则是这种保障的基础。本文在分析研究现有IEEE802.11p协议以及各种国内外相关文献的基础上,针对协议中控制信道时隙在网络拥挤的状态下无法满足大量安全控制信息传输的问题,对协议提出了改进方法。首先,本文对无线接入协议IEEE802.11p进行了研究和分析,介绍了国内外相关领域的研究现状。以及对协议中所使用的CSMA/CA机制的马尔科夫模型的推导,总结出协议中存在的在网络拥挤状态下安全信息无法及时传输以及业务信道未得到充分利用的问题。其次,通过对问题成因的分析,对原协议提出四点改进意见。分别是： 1、WAVE服务集节点通过读取广播消息实现服务集节点数目感听与控制； 2、提出在业务信道时隙辅助发送安全信息的方法和策略； 3、WAVE多服务集分配业务信道方法； 4、WBSS的生命周期策略。通过这些改进策略,改进协议的数据发送时延等关键性能指标。最后,使用OPNET仿真软件对IEEE802.11p协议进行了仿真。实现了不同速度场景,不同节点数场景,以及同一场景不同信道负载的多种情况的性能仿真。结果表明：改进策略对原协议的时延、丢包率以及吞吐量均有较好的改善。
[Abstract]:In recent years, with the development of intelligent transportation system (its), the development of vehicle-road collaborative system has attracted much attention. As an important part of intelligent transportation system, vehicle-road coordination system can make vehicles. The information interaction between vehicles and roadside infrastructure is more timely and effective to optimize the use of system resources, improve road traffic safety, alleviate traffic congestion. It can provide good communication guarantee for traffic safety related applications. A wireless access protocol which can adapt to the mobile ad hoc network is the basis of this kind of guarantee. This paper analyzes and studies the existing IEEE802.11p protocol and the basis of various domestic and foreign related literature. On the basis. Aiming at the problem that the control channel time slots in the protocol can not satisfy a large amount of security control information transmission under the condition of network congestion, this paper proposes an improved method for the protocol. Firstly, this paper studies and analyzes the wireless access protocol (IEEE802.11p). This paper introduces the research status of related fields at home and abroad, and the derivation of Markov model of CSMA/CA mechanism used in the protocol. This paper summarizes the problems in the protocol that the security information can not be transmitted in time under the condition of network congestion and that the traffic channel is not fully utilized. Secondly, through the analysis of the causes of the problem, the paper puts forward four suggestions to improve the original agreement. They are: (1) the number of service set nodes can be sensed and controlled by reading broadcast messages; (2) the method and strategy of sending security information in traffic channel time slot are put forward. 3WAVE multi-service set assignment channel method; 4 the life cycle strategy of WBSS. Through these improved strategies, the data transmission delay and other key performance indicators of the protocol are improved. Finally, the IEEE802.11p protocol is simulated by using OPNET simulation software. Different speed scenarios and different node points scenarios are realized. The simulation results show that the improved scheme can improve the delay, packet loss rate and throughput of the original protocol.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U495;TN915.04

【共引文献】