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首页> 外文期刊>Intelligent Transportation Systems, IEEE Transactions on >Performance Modeling of Safety Messages Broadcast in Vehicular Ad Hoc Networks
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Performance Modeling of Safety Messages Broadcast in Vehicular Ad Hoc Networks

机译：车载Ad Hoc网络中安全消息广播的性能建模

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摘要

In vehicular ad hoc networks (VANETs), because all vehicles in range are shown as destination nodes and less time is spent for the medium access process, broadcast communication is considered a highly appropriate technique for the dissemination of safety messages in such networks. However, the lack of request-to-send/clear-to-send handshaking and packet acknowledgment makes the communication more vulnerable to interferences, thus resulting in lower communication reliability. In this paper, we present an analytical model for the performance evaluation of safety message dissemination in vehicular ad hoc networks with two priority classes. In particular, considering the IEEE 802.11 broadcast protocol and using 2-D Markov modeling, we derive the joint distribution of the numbers of low-priority periodic messages, which are in transmission mode and in a backoff process in a highway. Then, the result is used to derive the average dissemination delay of high-priority event-driven messages in the presence of the low-priority traffic in the network. The results are helpful in determining a good tradeoff between network parameters such as vehicles' transmission range, safety traffic generation rate, and medium access control (MAC) parameters to satisfy the required delay bounds for the critical high-priority traffic.
机译：在车辆自组织网络（VANET）中，由于将范围内的所有车辆都显示为目标节点，并且花费较少的时间进行媒体访问过程，因此广播通信被认为是在此类网络中传播安全消息的高度合适的技术。但是，缺少请求发送/清除发送握手和数据包确认使通信更容易受到干扰，从而导致通信可靠性降低。在本文中，我们提出了一个具有两个优先级类别的车辆自组织网络中安全消息传播性能评估的分析模型。特别是，考虑到IEEE 802.11广播协议并使用2-D马尔可夫建模，我们得出了低优先级周期性消息数量的联合分布，这些消息处于传输模式并且处于高速公路的退避过程中。然后，将结果用于在网络中存在低优先级流量的情况下，得出高优先级事件驱动的消息的平均分发延迟。结果有助于确定网络参数之间的良好权衡，例如车辆的传输范围，安全交通产生率和媒体访问控制（MAC）参数，以满足关键的高优先级交通所需的延迟范围。

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