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Wireless Communications and Mobile Computing
Volume 2017, Article ID 5719594, 19 pages
Research Article

An Adaptive Medium Access Parameter Prediction Scheme for IEEE 802.11 Real-Time Applications

High-Performance Networks and Architectures (RAAP), Albacete Research Institute of Informatics (I3A), University of Castilla-La Mancha, Albacete, Spain

Correspondence should be addressed to Estefanía Coronado; se.mlcu@odanoroc.ainafetse

Received 28 July 2016; Revised 10 October 2016; Accepted 27 October 2016; Published 16 January 2017

Academic Editor: Francisco Martínez

Copyright © 2017 Estefanía Coronado 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.


Multimedia communications have experienced an unprecedented growth due mainly to the increase in the content quality and the emergence of smart devices. The demand for these contents is tending towards wireless technologies. However, these transmissions are quite sensitive to network delays. Therefore, ensuring an optimum QoS level becomes of great importance. The IEEE 802.11e amendment was released to address the lack of QoS capabilities in the original IEEE 802.11 standard. Accordingly, the Enhanced Distributed Channel Access (EDCA) function was introduced, allowing it to differentiate traffic streams through a group of Medium Access Control (MAC) parameters. Although EDCA recommends a default configuration for these parameters, it has been proved that it is not optimum in many scenarios. In this work a dynamic prediction scheme for these parameters is presented. This approach ensures an appropriate traffic differentiation while maintaining compatibility with the stations without QoS support. As the APs are the only devices that use this algorithm, no changes are required to current network cards. The results show improvements in both voice and video transmissions, as well as in the QoS level of the network that the proposal achieves with regard to EDCA.