title   
  

Scheduling for next generation WLANs: filling the gap between offered and observed data rates

Çiftçioğlu, Ertuğrul Necdet and Gürbüz, Özgür (2011) Scheduling for next generation WLANs: filling the gap between offered and observed data rates. Wireless Communications and Mobile Computing (Special Issue: Wireless Mesh and Other Emerging Wireless Network Technologies), 11 (5). pp. 654-666. ISSN 1530-8669

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Official URL: http://dx.doi.org/10.1002/wcm.808

Abstract

In wireless networks, opportunistic scheduling is used to increase system throughput by exploiting multi-user diversity. Although recent advances have increased physical layer data rates supported in wireless local area networks (WLANs), actual throughput realized are significantly lower due to overhead. Accordingly, the frame aggregation concept is used in next generation WLANs to improve efficiency. However, with frame aggregation, traditional opportunistic schemes are no longer optimal. In this paper, we propose schedulers that take queue and channel conditions into account jointly, to maximize throughput observed at the users for next generation WLANs. We also extend this work to design two schedulers that perform block scheduling for maximizing network throughput over multiple transmission sequences. For these schedulers, which make decisions over long time durations, we model the system using queueing theory and determine users' temporal access proportions according to this model. Through detailed simulations, we show that all our proposed algorithms offer significant throughput improvement, better fairness, and much lower delay compared with traditional opportunistic schedulers, facilitating the practical use of the evolving standard for next generation wireless networks.

Item Type:Article
Uncontrolled Keywords:opportunistic scheduling • resource allocation • wireless LANs • multi-user diversity • wireless MAC • queueing theory
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1-4661 Electrical engineering. Electronics Nuclear engineering
T Technology > TK Electrical engineering. Electronics Nuclear engineering
ID Code:12070
Deposited By:Özgür Gürbüz
Deposited On:01 Oct 2009 11:07
Last Modified:30 May 2011 15:52

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