Saturated throughput analysis of IEEE 802.11e using two-dimensional Markov chain model
QShine '06 Proceedings of the 3rd international conference on Quality of service in heterogeneous wired/wireless networks
Saturated throughput analysis of IEEE 802.11e EDCA
Computer Networks: The International Journal of Computer and Telecommunications Networking
A fragment-based retransmission scheme with QoS considerations for wireless networks
IWCMC '07 Proceedings of the 2007 international conference on Wireless communications and mobile computing
A comparison performance analysis of QoS WLANs: approaches with enhanced features
Advances in Multimedia
A cross-layer support for TCP enhancement in QoS-aware mobile ad hoc networks
Proceedings of the 11th international symposium on Modeling, analysis and simulation of wireless and mobile systems
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An analytical model is proposed to describe the priority schemes of the Enhanced Distributed Channel Access (EDCA) mechanism of the IEEE 802.11e standard. EDCA provides class-based differentiated Quality of Service (QoS) to IEEE 802.11 WLANs. The main contribution of this paper opposed to other works is that the model predicts the full delay distribution through its z-transform. Furthermore, the mean delay, throughput and frame dropping probabilities of the different traffic classes are found in the whole range from a lightly loaded, non-saturated channel to a heavily congested, saturated medium. Moreover, the model describes differentiation based on different Arbitration Inter-Frame Space (AIFS) values, in addition to the other adjustable parameters (i.e. window-sizes, retransmission limits, transmission opportunity (TXOP) lengths etc.) also encompassed by previous models. AIFS differentiation is described by a simple equation that enables access points to predict at which traffic loads starvation of a traffic class will occur. The model is calculated numerically and validated against simulation results. We observed a good match between the analytical model and simulations.