密集WiFi网络中基于延迟的空中WiFi拥塞控制

Changhua Pei, Youjian Zhao, Yunxin Liu, Kun Tan, Jiansong Zhang, Yuan Meng, Dan Pei
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引用次数: 10

摘要

WiFi已经成为上网的主要方式。然而,wifi跳延迟,特别是在密集wifi环境下,远不能令人满意[1],以支持延迟敏感的应用,如Web浏览和VoIP。WiFi延迟主要来自于两种队列:主机队列和分布式队列,这是由CSMA/CA机制在多个节点竞争信道时产生的。虽然在终端主机上使用优先级调度可以很容易地绕过主机队列,但分布式队列却不能。以前,IEEE 802.11e试图通过调整MAC层参数在这个分布式队列中提供优先级,但是当有越来越多的延迟敏感流时,它无法扩展。在本文中,我们提出并设计了一种实用的解决方案QAir,以减少密集WiFi网络中延迟敏感流的WiFi延迟。QAir采用一种不同的方法将这个分布式队列传输到主机队列。因此,延迟敏感流可以绕过整个队列,并且它们的延迟可以大大降低。QAir以分布式方式工作,没有集中的调度程序。我们已经在商用WiFi设备上实现了QAir。实验结果表明,与802.11 DCF基准相比,QAir可以将延迟敏感流的平均wi -hop延迟降低50-75%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Latency-based WiFi congestion control in the air for dense WiFi networks
WiFi has become the primary method to access the Internet. However, the WiFi-hop latency, particularly in dense-WiFi environments, is far from satisfactory [1], to support delay-sensitive applications such as Web browsing and VoIP. The WiFi latency mainly comes from two kinds of queues: the host queue and the distributed queue, which is caused by CSMA/CA mechanism when multiple nodes contend for the channel. While the host queue can be easily bypassed using priority scheduling at end-host, the distributed queue is not. Previously, IEEE 802.11e tries to provide priorities in this distributed queue by adjusting the MAC layer parameters, but it does not scale when there are increasing number of delay-sensitive flows. In this paper, we propose and design QAir, a practical solution to reduce WiFi latency of delay-sensitive flows in dense WiFi networks. QAir takes a different approach to transfer this distributed queue to host queue. Consequently, the delay-sensitive flows can bypass the entire queue and their latency can be greatly reduced. QAir works in a distributed manner with no centralized scheduler. We have implemented QAir on commodity WiFi devices. Experimental results show that, compared to the 802.11 DCF baseline, QAir can reduce the average WiFi-hop latency of delay-sensitive flows by 50–75%.
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