Institute of Computer Science
Georg-August-Universität Göttingen
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Informatik-Kolloquium: A System Theoretic Approach to Bandwidth Estimation
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Dr. Jorg Liebeherr, Professor at the Department of Electrical and Computer Engineering, University of Toronto and Nortel Chair of Network Architecture and Services, is giving a speech on May 26, 2008, 16:00ct, in room GLS 0.101, Sternwarte IFI, Geismarlandstr. 11. |
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A System Theoretic Approach to Bandwidth Estimation
Jörg Liebeherr Department of Electrical and Computer Engineering University of Toronto Abstract: Much research has been dedicated to methods that estimate the available bandwidth in a network from traffic measurements, yet little progress has been made on achieving a foundational understanding of the bandwidth estimation problem. In this talk, we develop a min-plus system theoretic formulation of bandwidth estimation. We show that the problem as well as previously proposed solutions can be concisely described and derived using min-plus system theory, thus establishing the existence of a strong link between network calculus and network probing methods. We relate difficulties in network probing to potential non-linearities of the underlying systems, and provide a justification for the distinctive treatment of FIFO scheduling in network probing. Experiments on an Emulab testbed are used to evaluate the theoretical concepts in actual implementations of probing schemes. This talk presents joint work with Markus Fidler (TU Darmstadt) and Shahrokh Valaee (U. Toronto). Speaker bio: Jorg Liebeherr received the Ph.D. degree in Computer Science from the Georgia Institute of Technology in 1991. After a Postdoc at the University of California, Berkeley, he joined the Department of Computer Science at the University of Virginia in 1992. Since Fall 2005, he is with the Department of Electrical and Computer Engineering of the University of Toronto as the Nortel Chair of Network Architecture and Services. He has served on editorial boards and program committees of several journals and conferences in computer networking. He was Editor-in-Chief of IEEE Network in 1999-2000. He is a co-author of the textbook ``Mastering Networks: An Internet Lab Manual'', published by Addison-Wesley in 2004. He was co-recipient of a best paper award at ACM Sigmetrics 2005. He was an elected Member-at-Large of the IEEE Communications Society Board of Governors in 2003-2005, and chair of the IEEE Communications Society Technical Committee on Computer Communications in 2004-2005. He received an NSF Career award in 1996, a Virginia Engineering Foundation fellowship in 2002, and an Outstanding Service award from the the IEEE Communications Society Technical Committee on Computer Communications in 2006. He is a Fellow of the IEEE. His current research interests are networks with service guarantees and self-organizing peer networks. |
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