ABSTRACT Drive-thru (or Intemet of Vehicles)is a promising technique that exploits the inte卜collIlected roadside units(RSUs)to offer access for mobile there have been many studies aiming to improve the performance of the drive—thru system,most existing solutions cannot support multiple services(e·g·,data,video,and voice)and guarantee their quality of service(QoS)requirements simultaneously. Based on the in-depth study of drive—thru Intemet,QoS enhancement solutions are presented in this thesis for drive-thru Intemet to enhance the access performance of different maj or works of this thesis Can be shown as following: 1·An opportunistic vehicle-to-vehicle relay protocol with adaptive modulation is scheme is able to guarantee a high essful transmission probability to achieve a work throughput. 2·An adaptive collision avoidance with service differentiation(ACASD)scheme is presented to improve the work performance with dynamically adjusted medium access control(MAC)layer parameters and support multiple services by assigning an appropriate priority level for each specific packet. 3. paring and evaluating different QoS schemes in a drive-work 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 . Keywords:QoS Enhancement,IEEE ,Adaptive Modulation,Opportunistic Relay,Adaptive Collision Avoidance,Service Differentiation 万方数据 目录 目录 摘要 .I ABSTRACT .II 目录 ..IIl 第一章绪论 1 1 2 4 QoS优化解决方案 4 4 一4 第二章车联网络系统原理 5 一5 8 王0 第三章自适应调制的车辆机会中继 11 11 11 12 12 ORAM策略简介 12 RSU调制模式 ..12 13 13 .13 ORAM方案的分析 15 15 3
