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首页> 外文会议>International conference on advanced engineering - theory and applications >Adaptive TDMA and CSMA-Based MAC Protocols for Vehicular Ad Hoc Networks: A Survey
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Adaptive TDMA and CSMA-Based MAC Protocols for Vehicular Ad Hoc Networks: A Survey

机译：车载Ad Hoc网络的自适应TDMA和基于CSMA的MAC协议的调查

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摘要

Vehicle Ad Hoc Network (VANET) created between vehicles or between vehicles and centralized infrastructures is a dynamic network. Specifically, VANET can support many services such as safety, traffic management, and user-oriented services to improve transportation efficiency. Medium Access Control (MAC) protocol in VANETs not only responds the different requirements of these services but also improves the efficient broadcasting safety messages. One such protocol is to employ both TDMA and CSMA schemes in the Control CHannel (CCH), called a hybrid MAC protocol. A vehicle will send safety message without collision on the TDMA-based period during its reserved time slot and utilize the SCH resources on the CSMA-based period for the non-safety message. In addition, the TDMA-based period can be adjusted according to vehicle density. Hence, these systems can adapt themselves to various traffic conditions and improve the throughput for safety messages. In this survey, we compare different hybrid MAC protocols using dynamic TDMA-based periods as well as their benefits and limitations. Finally, we discuss some issues and promising future research which can be satisfied different QoS requirements and efficiently support both safety and non-safety services.
机译：在车辆之间或车辆与集中式基础设施之间创建的车辆自组织网络（VANET）是动态网络。具体地说，VANET可以支持许多服务，例如安全，流量管理和面向用户的服务，以提高运输效率。 VANET中的媒体访问控制（MAC）协议不仅可以响应这些服务的不同要求，还可以提高有效的广播安全消息。一种这样的协议是在控制信道（CCH）中同时使用TDMA和CSMA方案，称为混合MAC协议。车辆将在其保留时隙内的基于TDMA的时间段内发送安全消息而不会发生冲突，并将基于CSMA的时间段上的SCH资源用于非安全消息。此外，可以根据车辆密度调整基于TDMA的时间段。因此，这些系统可以使自己适应各种交通状况，并提高安全消息的吞吐量。在这项调查中，我们比较了使用基于动态TDMA的周期的不同混合MAC协议及其优势和局限性。最后，我们讨论了可以满足不同QoS要求并有效支持安全和非安全服务的一些问题和有前途的未来研究。

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