On the service differentiation capabilities of EY-NPMA and 802.11 DCF

Authors:
Orestis Tsigkas;Fotini-Niovi Pavlidou;Gerasimos Dimitriadis
Affiliations:
Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki;Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki;Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki
Venue:
WWIC'05 Proceedings of the Third international conference on Wired/Wireless Internet Communications
Year:
2005

Citing 8
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Abstract

Most existing WLAN access mechanisms cannot provide QoS assurances. Even those that are QoS aware can only provide relative service differentiation. Based on EY-NPMA, the HIPERLAN Medium Access Control algorithm, we propose a dynamic priority medium access scheme to provide time-bounded services. By approximating an ideal Earliest Deadline First (EDF) scheduler, the proposed scheme can offer delay and delay jitter assurances while achieving high medium utilization. Furthermore, we compare our scheme with a mechanism that enhances the IEEE 802.11 MAC protocol with QoS support. Simulation studies document and confirm the positive characteristics of the proposed mechanism.