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Cross-layer transmit power and beacon rate adaptation for VANETs

机译:VaNET的跨层发射功率和信标速率适配

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摘要

The key benefit of VANETs comes in the form of safety applications. Broadcast is the predominant form of communication for safety messages. However, due to the fast changes occurring in the network topology (sparse, dense, congested), vehicles within a VANET may face many disturbances such as collisions which can cause performance degradations. Thus it becomes hard to maintain an efficient channel utilization and so maximize the network capacity. In this paper, the idea is to take into account the dynamically changing topology of a VANET (local traffic density) and have each vehicle able to dynamically adapt its PHY QoS-parameter (Transmit Power) according to its fast changing channel conditions, network load, and link quantities of upper-layers. The proposed mechanism, called Transmit Power Adaptation (TPA) relies on channel estimate at PHY layer and uses feedback from an adaptive beaconing system (also presented) which builds the local view of a vehicle at the network layer. We have evaluated the performance of TPA through simulation with ns-3 simulator. Results show that TPA clearly outperforms the default 802.11 broadcasting mechanism in terms of network capacity. TPA also outperforms a similar adaptive technique not based on channel estimate in terms of network capacity for three scenarios. © 2013 ACM.
机译:VANET的主要优势在于安全应用程序的形式。广播是安全消息通信的主要形式。但是,由于网络拓扑中发生的快速变化(稀疏,密集,拥塞),VANET内的车辆可能会遇到许多干扰,例如碰撞,可能会导致性能下降。因此,难以维持有效的信道利用率并因此最大化网络容量。本文的想法是考虑到VANET的动态变化拓扑(本地流量密度),并使每辆车能够根据其快速变化的信道条件,网络负载动态调整其PHY QoS参数(发射功率) ,以及上层的链接数量。所提出的机制称为发射功率自适应(TPA)依赖于PHY层的信道估计,并使用来自自适应信标系统(也已提出)的反馈,该系统在网络层建立车辆的本地视图。通过使用ns-3模拟器进行仿真,我们评估了TPA的性能。结果表明,就网络容量而言,TPA明显优于默认的802.11广播机制。在三种情况下,TPA在网络容量方面也优于基于信道估计的类似自适应技术。 ©2013 ACM。

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    Sander Frigau, Matthias;

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  • 年度 2013
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  • 正文语种 eng
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