智能传输系统中专用短程通信的媒体访问控制

MAC for Dedicated Short Range Communications in Intelligent Transport System

在北美新的智能传输系统中,为缓解交通堵塞的表面传输设施的关键是建立在车—车无线电通信基础上,而75MHz专用短程通信可通过车—路连接满足将来大量媒介的传送。概述了专用短程通信的应用和IEEE802.11PHY和MAC属性的评估,及DSRC中802.11的局限性和DSRC的发展现状,期望802.11规格做出适当的调整来满足DSRC环境中多中继站连通性、高速车辆运行和一系列服务质量的需求。

In new intelligent transportation system of North American, the emphasis of the surface transportation infrastructure is based on vehicle-to-vehicle wireless communications,while 75 MHz dedicated short range communications may content to future delivery of rich media via vehicle-to-roadside links.This paper provides a tutorial overview of DSRC applications, assess IEEE 802.11 PHY and MAC layer characteristics,limitations of 802.11 in DSRC environments and state of DSRC. and anticipates that 802.11 specifications will need to be suitably altered to meet requirements for DSRC environments of multihop connectivity,, high vehicle mobility and a variety of QOS requirements.