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MAC for dedicated short range communications in intelligent transport system

机译：MAC用于智能运输系统中的专用短距离通信

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The need for critical improvements to the North American surface transportation infrastructure vis-a-vis alleviation of congestion while enhancing public safety has led to new intelligent transportation system (ITS) infrastructure based on vehicle-to-vehicle (v2v) wireless communications. The allocation of 75 MHz in the 5.9 GHz band for dedicated short-range communications (DSRC) may also enable future delivery of rich media content to vehicles at short to medium ranges via vehicle-to-roadside (v2e) links. Recently, AASTM committee E17.51 endorsed a variant of the IEEE wireless LAN standard, denoted 802.11a roadside applications (R/A), as the platform for the DSRC link and data link layer. In this article, we provide a tutorial overview of DSRC applications and assess IEEE802.11 PHY and MAC layer characteristics in this context. It is anticipated that current 802.11 specifications need to be suitably altered to meet requirements for DSRC environments of multihop connectivity, high vehicle mobility, and heterogeneous services with a variety of QoS requirements for which the original design was not intended. This article captures the current state of the art of 802.11-based multiple access protocols and highlights open research issues.
机译：相对于缓解拥堵，同时提高公共安全性，对北美水陆运输基础设施进行重大改进的需求，导致了基于车对车（v2v）无线通信的新型智能交通系统（ITS）基础设施。在5.9 GHz频带中为专用短距离通信（DSRC）分配75 MHz的频率，还可以使将来通过车辆到路边（v2e）链路将富媒体内容传送到中短距离的车辆。最近，AASTM委员会E17.51批准了IEEE无线LAN标准的一种变体，称为802.11a路边应用（R / A），作为DSRC链路和数据链路层的平台。在本文中，我们提供了DSRC应用程序的教程概述，并在此上下文中评估了IEEE802.11 PHY和MAC层特性。可以预见，当前的802.11规范需要进行适当的修改，以满足多跳连接，高车辆移动性和具有各种QoS要求的异构服务的DSRC环境的要求，而这并不是原始设计的目的。本文介绍了基于802.11的多址访问协议的最新技术，并重点介绍了开放研究问题。

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