Impact of decentralized congestion control on contention-based forwarding in VANETs

2016 IEEE 17th International Symposium on A World of Wireless, Mobile and Multimedia Networks (WoWMoM) Pub Date : 2016-06-21 DOI:10.1109/WoWMoM.2016.7523572

Sebastian Kuhlmorgen, Andreas Festag, G. Fettweis

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引用次数: 18

Abstract

Vehicular ad hoc networks based on IEEE 802.11 OCB suffer from channel congestion, which will be critical for safety applications when the channel becomes saturated. Therefore, decentralized congestion control (DCC) is needed that keeps the channel load under a pre-defined threshold. In the European system for vehicular communication, a DCC-gatekeeper has been inserted into the protocol stack that reduces the data traffic generated or forwarded by the vehicle. This DCC-gatekeeper affects the functionality of the contention-based forwarding (CBF) and degrades its performance. In this paper we evaluate the performance of CBF under congestion-free and saturated channel conditions for several protocol variants: DCF, EDCA and DCC-gatekeeper. The results show that the standard DCC-gatekeeper hampers the functionality of CBF even for small node densities. We enhance the DCC-gatekeeper-based approach to overcome this issue and evaluate the protocol variants in terms of reliability, latency and channel load in a freeway scenario with realistic trace-based mobility.

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分散拥塞控制对vanet中基于争用的转发的影响

基于IEEE 802.11 OCB的车载自组织网络存在信道拥塞问题，当信道饱和时，信道拥塞对安全应用至关重要。因此，需要分散的拥塞控制(DCC)来将通道负载保持在预定义的阈值以下。在欧洲的车辆通信系统中，在协议栈中插入了一个dc -gatekeeper，以减少车辆产生或转发的数据流量。这个DCC-gatekeeper会影响基于争用的转发(CBF)的功能并降低其性能。在本文中，我们评估了几种协议变体(DCF, EDCA和DCC-gatekeeper)在无拥塞和饱和信道条件下的CBF性能。结果表明，即使在较小的节点密度下，标准的DCC-gatekeeper也会阻碍CBF的功能。我们改进了基于dcc -gatekeeper的方法来克服这个问题，并在高速公路场景中评估了可靠性、延迟和信道负载方面的协议变体，具有现实的基于跟踪的移动性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 IEEE 17th International Symposium on A World of Wireless, Mobile and Multimedia Networks (WoWMoM)

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