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Kostas Pentikousis

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Publication Details

K. Pentikousis, E. Piri, J. Pinola, and I. Harjula, "WiMAX performance in practice", Chapter 2 in M. Katz and F. H.P. Fitzek (Eds.) WiMAX Evolution: Emerging Technologies and Applications, Chichester, West Sussex, UK: Wiley, 2009, pp. 17-43. ISBN: 978-0-470-69680-4.

Abstract—According to some estimates, by 2010 WiMAX operators will cover areas inhabited by more than 650 million people. Yet current deployment lags similar previous expectations and predictions. Moreover, non-vendor, third-party empirical evaluations of the technology are far from common. In fact, most WiMAX studies have up to now employed solely simulation, modeling, and analytical tools. It is not really well-understood what is in practice possible with commercial, off-the-shelf WiMAX equipment. This chapter presents results from our recently concluded baseline, VoIP and IPTV synthetic traffic measurement and analysis studies over WiMAX at the VTT Converging Networks Laboratory in Oulu, Finland, and aims at contributing to our understanding about the potential of WiMAX in practice.

This chapter is organized as follows. Section 2.1 provides a short literature review of other empirical studies of WiMAX. Section 2.2 introduces our fixed WiMAX testbed and our methodology with respect to traffic generation, metrics, and testbed host clock synchronization. It also provides baseline capacity measurements and relates them with previously published works. Section 2.3 presents our empirical evaluation of VoIP over fixed WiMAX. The section explains the issues arising from header overhead in VoIP, discusses the performance of different VoIP codecs, and highlights the performance gains that may be attained by employing VoIP aggregation. Section 2.4 presents our evaluation of emulated IPTV audio/video streaming over fixed WiMAX, for both line of sight (LOS) and non line of sight (NLOS) conditions. Section 2.5 presents an empirical evaluation study of the baseline capacity of a mobile WiMAX testbed, which we consider to be the first publicly disclosed. Finally, Section 2.6 summarizes this chapter and Section 2.7 provide pointers for further reading.
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TagsNetworks, Traffic measurements and analysis
Project—WEIRD (6/2006-5/2008). More »

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Last updated: 22.11.2009