车联网的服务质量优化解决方案软件工程专业论文.docxVIP

ABSTRACTDrive-thru ABSTRACT Drive-thru Internet(or Intemet of Vehicles)is promising technique that exploits the inte卜collIlected roadside units(RSUs)to offer Internet for mobile users．Although there have been many studies aiming to improve the performance of the drive—thru Internet system，most existing solutions cannot support multiple services(e·g·，data,video，and voice)and guarantee their quality of service(QoS)requirements simultaneously． Based the in-depth study of drive—thru Intemet，QoS enhancement solutions presented in this thesis for drive-thru Intemet to enhance the performance of different applications．The maj works of this thesis Can be shown following： 1·An opportunistic vehicle-to-vehicle relay protocol with adaptive modulation is proposed．This scheme is able to guarantee high successful transmission probability to achieve high network throughput． 2·An adaptive collision avoidance with service differentiation(ACASD)scheme is presented to improve the overall network performance with dynamically adjusted medium control(MAC)layer parameters and support multiple services by assigning appropriate priority level for each specific packet． 3． For comparing and evaluating different QoS schemes in drive-thru network environment，an efficient simulator is designed and developed． The simulation results demonstrate that the QoS enhancement solution is able to satisfy the QoS requirements of multiple services simultaneously in drive．thru Internet． Keywords：QoS Enhancement，IEEE 802．1lp，Adaptive Modulation，Opportunistic Relay，Adaptive Collision Avoidance，Service Differentiation 万方数据 目录目录 目录 目录 摘要 ．I ABSTRACT ．II 目录 ．．IIl 第一章绪论 1 1．1研究背景及意义 1 1．2车联网通信系统研究现状 2 1．3论文的主要工作 4 1．3．1 QoS优化解决方案 4 1．3．2车联网络模拟系统 4 1．4论文结构安排 一4 第二章车联网络系统原理 5 2．1车辆的移动性 一5 2．2车联网络的相关协议 8 2．3车联网络的连接性 王0 第三章自适应调制的车辆机会中继 11 3．1分布式的机会中继 11 3．1．1候选中继节点的选定 11 3．1．2中继节点的转发 12 3．1．3原始机会中继的局限性 12 3．2 ORAM策略简介 12 3．2．1 RSU调制模式 ．．12 3．2．2中继节点调制模式 13 3．2．3最优调制模式组合的选定 13 3．3系统模型 ．13 3．4 ORAM方案的分析 15 3．