Abstract
AbstractWe investigate joint transmission power control and playout buffer control for packetized media streaming over wireless links. We propose a novel model formulation that tracks the play/freeze duration and play/freeze switch jitter to control the transmission power and playout rate (1 or 0, i.e., play or rebuffer). The model is especially appropriate for audio/music streaming. The optimal joint control is obtained using a Dynamic Programming approach to balance the average power used against achieved quality of service (QoS), reflecting play/freeze duration and jitter frequency. We also investigate two key special cases, where either only power control or rebuffer control is exercised; we obtain certain useful provable structural properties of these individual side controls. Based on those, we also design a low‐complexity heuristic control that ‘mimics’ the obtained structural properties of the optimal ones. Through simulation we see that the developed controls can achieve substantially higher performance over standard benchmark schemes. Copyright © 2008 John Wiley & Sons, Ltd.
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