Delay versus energy consumption of the IEEE 802.16e sleep-mode mechanism

Authors:
S. De Vuyst;K. De Turck;D. Fiems;S. Wittevrongel;H. Bruneel
Affiliations:
Department of Telecommunications and Information Processing, Ghent University, Ghent, Belgium;Department of Telecommunications and Information Processing, Ghent University, Ghent, Belgium;Department of Telecommunications and Information Processing, Ghent University, Ghent, Belgium;Department of Telecommunications and Information Processing, Ghent University, Ghent, Belgium;Department of Telecommunications and Information Processing, Ghent University, Ghent, Belgium
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

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Abstract

We propose a discrete-time queueing model for the evaluation of the IEEE 802.16e sleep-mode mechanism of Power Saving Class (PSC) I in wireless access networks. Contrary to previous studies, we model the downlink traffic by means of a Discrete Batch Markov Arrival Process (D-BMAP) with N phases, which allows to take traffic correlation into account. The tradeoff between energy saving and increased packet delay is discussed. In many situations, the sleep-mode performance improves for heavily correlated traffic. Also, when compared to other strategies, the exponential sleep-period update strategy of PSC I may not always be the best.