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CESG Teleseminar: Making Wi-Fi Work in Multi-Hop Topologies: Automatic Negotiation and Allocation of Airtime

February 24, 2017 @ 4:10 pm - 5:10 pm

| Free

Violet R. Syrotiuk – Arizona State University

Abstract:  We propose a solution for mitigating the performance impairments of CSMA/CA protocols in multi-hop topologies based on the dynamic adaptation of the contention process experienced by nodes in a wireless network. A distributed protocol is used to negotiate the channel airtime for a node as a function of the traffic requirements of its neighborhood, taking into account bandwidth reserved for the control operations. A mechanism is provided for a node to tune its contention window depending on its allocated airtime. Different from previous schemes, a node’s contention window is fixed in size unless the traffic requirements of its neighborhood change.  The scheme is implemented on legacy commercial 802.11 devices.  Extensive experimental results, performed on the CREW European testbed, demonstrate the effectiveness of the approach.

Bio: Violet R. Syrotiuk earned her Ph.D. in Computer Science from the University of Waterloo in Canada. She is currently an Associate Professor of Computer Science and Engineering at Arizona State University. Her interests lie in dynamic adaptation to changing conditions in wireless networks, especially at the MAC layer.  Her research has been supported by grants from NSF, ONR, and DSTO, and contracts with LANL, Raytheon, and General Dynamics among others. She serves on the editorial boards of Computer Networks and Computer Communications, as well as on the technical program and organizing committees of several major conferences sponsored by ACM and IEEE.


February 24, 2017
4:10 pm - 5:10 pm


WEB, Room 236-C
Wisenbaker Engineering Building
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