Patras, Paul and Garcia-Saavedra, Andres and Malone, David and Leith, Douglas J. (2016) Rigorous and Practical Proportional-fair Allocation for Multi-rate Wi-Fi. Ad Hoc Networks, 36 (1). pp. 21-34. ISSN 1570-8705

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Abstract

Recent experimental studies confirm the prevalence of the widely known performance anomaly problem in current Wi-Fi networks, and report on the severe network utility degradation caused by this phenomenon. Although a large body of work addressed this issue, we attribute the refusal of prior solutions to their poor implementation feasibility with off-the-shelf hardware and their impre- cise modelling of the 802.11 protocol. Their applicability is further challenged today by very high throughput enhancements (802.11n/ac) whereby link speeds can vary by two orders of magnitude. Unlike earlier approaches, in this paper we introduce the first rigorous analytical model of 802.11 stations’ throughput and airtime in multi-rate settings, without sacrificing accuracy for tractability. We use the proportional-fair allocation criterion to formulate network utility maximisation as a con- vex optimisation problem for which we give a closed-form solution. We present a fully functional light-weight implementation of our scheme on commodity access points and evaluate this extensively via experiments in a real deployment, over a broad range of network conditions. Results demonstrate that our proposal achieves up to 100% utility gains, can double video streaming goodput and reduces TCP download times by 8x.

Item Type:	Article
Additional Information:	This is the preprint version of the published article, which is available at DOI: 10.1016/j.adhoc.2015.06.002
Keywords:	802.11; multi-rate; proportional fairness;
Academic Unit:	Faculty of Science and Engineering > Mathematics and Statistics Faculty of Science and Engineering > Research Institutes > Hamilton Institute
Item ID:	6758
Identification Number:	https://doi.org/10.1016/j.adhoc.2015.06.002
Depositing User:	Dr. David Malone
Date Deposited:	11 Jan 2016 14:54
Journal or Publication Title:	Ad Hoc Networks
Publisher:	Elsevier
Refereed:	Yes
URI:	http://www.sciencedirect.com
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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