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Improving Performance of IEEE 802.11p MAC Layer for Emergency Message Dissemination

机译:提高IEEE 802.11p maC层的性能,实现紧急消息传播

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摘要

Vehicular ad-hoc networking is the most promising subfield of mobile ad-hoc networks, which may become the ad-hoc networking technology in near future for vehicles communicating amongst themselves on road. It uses IEEE 802.11p MAC protocol as wireless networking technology. The IEEE 802.11p MAC protocol has inherent problems in wireless ad-hoc networking environment due its heterogeneous, infrastructureless and highly dynamic nature. The performance of IEEE 802.11p MAC layer for vehicular ad-hoc networking is based on performance of one-hop broadcasting.The performance of IEEE 802.11p one-hop broadcasting is of major concern regarding emergency message dissemination. The CSMA/CA protocol used in IEEE 802.11p is far from optimal solution for emergency message dissemination due to inherent properties of random access, higher delivery delays and retransmissions. Techniques to improve emergency message dissemination delivery rate and minimize time latency of message dissemination, such as, disabling backoff and synchronous transmission, have been mentioned in this thesis out of which one technique such as disabling backoff is being evaluated through simulation results.The goal of this thesis work is to evaluate a technique, modifying the IEEE 802.11p MAC layer protocol using Network Simulator 3 (NS3). The technique is based on introducing a separate EDCA queue and a separate EDCAF function for emergency messages in QoS EDCA priority queues, disabling backoff for emergency messages and giving highest priority to emergency messages in a station having different AC queues seeking for transmission opportunity. Disabling backoff for emergency messages may reduce time latency arising from exponential backoff algorithm. As the backoff is disabled, more than one station may start transmitting emergency message at the same time. So, it can be deduced that such technique could be beneficial for simple emergency applications. The simulation results show that this technique could be useful for emergency applications utilizing a buzz signal for hazardous warnings on road.
机译:车载自组织网络是移动自组织网络最有前途的子领域,它可能在不久的将来成为车辆之间相互通信的自组织网络技术。它使用IEEE 802.11p MAC协议作为无线网络技术。 IEEE 802.11p MAC协议具有异构,无基础架构和高度动态的特性,因此在无线自组织网络环境中存在固有的问题。用于车辆自组织网络的IEEE 802.11p MAC层的性能基于单跳广播的性能.IEEE 802.11p单跳广播的性能是紧急消息分发的主要关注点。由于随机访问的固有属性,较高的传递延迟和重传,IEEE 802.11p中使用的CSMA / CA协议远远不是用于紧急消息分发的最佳解决方案。本文提出了提高紧急消息分发传递速率并最小化消息分发的时间延迟的技术,例如禁用退避和同步传输,其中正在通过仿真结果评估诸如禁用退避的一种技术。本文的工作是评估一种技术,使用网络模拟器3(NS3)修改IEEE 802.11p MAC层协议。该技术基于为QoS EDCA优先级队列中的紧急消息引入单独的EDCA队列和单独的EDCAF功能,禁用紧急消息的退避并在具有不同AC队列的站点中为紧急消息赋予最高优先级,以寻求传输机会。对紧急消息禁用退避可以减少由指数退避算法引起的时间延迟。由于禁用了退避,一个以上的站点可能同时开始发送紧急消息。因此,可以推断出这种技术对于简单的紧急应用可能是有益的。仿真结果表明,该技术对于利用蜂鸣信号进行道路危险警告的应急应用可能有用。

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    Sardar Asif;

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