Experiences with a centralized scheduling approach for performance management of IEEE 802.11 wireless LANs

Authors:
Malati Hegde;Pavan Kumar;K. R. Vasudev;N. N. Sowmya;S. V. R. Anand;Anurag Kumar;Joy Kuri
Affiliations:
Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, India;Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, India and Brocade Communications Systems, Bangalore, India;Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, India and University of Kiel, Kiel, Germany;Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, India;Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, India;Department of Electrical Communication Engineering, Indian Institute of Science, Bangalore, India;Department of Electronic Systems Engineering, Indian Institute of Science, Bangalore, India
Venue:
IEEE/ACM Transactions on Networking (TON)
Year:
2013

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Abstract

We present a centralized integrated approach for: 1) enhancing the performance of an IEEE 802.11 infrastructure wireless local area network (WLAN), and 2) managing the access link that connects the WLAN to the Internet. Our approach, which is implemented on a standard Linux platform, and which we call ADvanced Wi-fi Internet Service EnhanceR (ADWISER), is an extension of our previous system WLAN Manager (WM). ADWISER addresses several infrastructure WLAN performance anomalies such as mixed-rate inefficiency, unfair medium sharing between simultaneous TCP uploads and downloads, and inefficient utilization of the Internet access bandwidth when Internet transfers compete with LAN-WLAN transfers, etc. The approach is via centralized queueing and scheduling, using a novel, configurable, cascaded packet queueing and scheduling architecture, with an adaptive service rate. In this paper, we describe the design of ADWISER and report results of extensive experimentation conducted on a hybrid testbed consisting of real end-systems and an emulated WLAN on Qualnet. We also present results from a physical testbed consisting of one access point (AP) and a few end-systems.