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Advances in Multimedia
Volume 2007, Article ID 23817, 13 pages
Research Article

A Comparison Performance Analysis of QoS WLANs: Approaches with Enhanced Features

1Department of Electrical and Computer Engineering, North Carolina State University, P.O. 27695-7911, Raleigh 27695, NC, USA
2National Research Institute of Finland VTT, Espoo 02150, Finland

Received 30 May 2007; Accepted 13 July 2007

Academic Editor: Stavros Kotsopoulos

Copyright © 2007 Ioannis Papapanagiotou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The main contribution of this work is to compare and enhance known methods for performance analysis of the IEEE 802.11e MAC layer, such as the use of Markov chains, queuing theory, and probabilistic analysis. It is the first paper that bases its outputs upon comparison of metrics such as complexity, flexibility, and accuracy, leading to the novel use of a metamodeling comparison. For the analysis, complexity theory and the L-square distance method for accuracy are used. In addition, the proposed analyses carry by themselves scientific interest, because they are extended enhancements with the latest EDCA parameters. A form of the PMF of the MAC delay and first-order moments are found using the PGF complex frequency domain function. The analyses incorporate a Gaussian erroneous channel in order to reflect the real conditions of the MAC layer.