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Experiences With WM: A Centralised Scheduling Approach for Performance Management of IEEE 802.11 Wireless LANs

Hegde, Malati and Kumar, Pavan and Vasudev, K. R. and Anand, S. V. R. and Kumar, Anurag and Kuri, Joy (2009) Experiences With WM: A Centralised Scheduling Approach for Performance Management of IEEE 802.11 Wireless LANs. In: 1st International Conference on Communication Systems and Networks, Jan, 05-10, 2009,, Bangalore, India., pp. 594-603.

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Abstract

In our earlier work ([1]) we proposed WLAN Manager (or WM) a centralised controller for QoS management of infrastructure WLANs based on the IEEE 802.11 DCF standards. The WM approach is based on queueing and scheduling packets in a device that sits between all traffic flowing between the APs and the wireline LAN, requires no changes to the AP or the STAs, and can be viewed as implementing a "Split-MAC" architecture. The objectives of WM were to manage various TCP performance related issues (such as the throughput "anomaly" when STAs associate with an AP with mixed PHY rates, and upload-download unfairness induced by finite AP buffers), and also to serve as the controller for VoIP admission control and handovers, and for other QoS management measures. In this paper we report our experiences in implementing the proposals in [1]: the insights gained, new control techniques developed, and the effectiveness of the WM approach in managing TCP performance in an infrastructure WLAN. We report results from a hybrid experiment where a physical WM manages actual TCP controlled packet flows between a server and clients, with the WLAN being simulated, and also from a small physical testbed with an actual AP.

Item Type: Conference Proceedings
Additional Information: Copyright 2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE
Keywords: WLAN Qos Management;WLAN Controllers;Split-MAC WLAN Controllers;IEEE 802.11 Wireless Networks.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 11 Aug 2009 08:50
Last Modified: 19 Sep 2010 05:40
URI: http://eprints.iisc.ernet.in/id/eprint/22101

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