Effective-capacity-based stochastic delay guarantees for systems with time-varying servers, with an application to IEEE 802.11 WLANs

Authors:
Emmanouil Kafetzakis;Kimon Kontovasilis;Ioannis Stavrakakis
Affiliations:
National Center of Scientific Research "Demokritos", Institute of Informatics & Telecommunications, P.O. Box 60228, GR-15310 Ag. Paraskevi, Greece and National & Kapodistrian University of Athens, ...;National Center of Scientific Research "Demokritos", Institute of Informatics & Telecommunications, P.O. Box 60228, GR-15310 Ag. Paraskevi, Greece;National & Kapodistrian University of Athens, Informatics & Telecommunications Department, Panepistimiopolis, Illisia, Athens 15784, Greece
Venue:
Performance Evaluation
Year:
2011

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Abstract

Many network applications rely on stochastic QoS guarantees. With respect to loss-related performance, the effective bandwidth/capacity theory has proved useful for calculating loss probabilities in queues with complex input and server processes and for formulating simple admission control tests to ensure associated QoS guarantees. This success has motivated the application of the theory for delay-related QoS too. However, up until now this application has been justified only heuristically for queues with variable service rate. The paper fills this gap by establishing rigorously that the effective bandwidth/capacity theory may be used for the asymptotically correct calculation and enforcement of delay tail-probabilities in systems with variable rate servers too. Subsequently, the paper applies the general results to IEEE 802.11 WLANs, by representing each IEEE 802.11 station as an On/Off server and employing the effective capacity function for this model. Comparison of analytical results with simulation validates the effectiveness of the On/Off IEEE 802.11 model for delay-related QoS, complementing earlier results on loss-related performance.