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IEEE 802.11 Power-Save Mode (PSM) has been proposed in wireless LANs and multi-hop wireless networks to coordinate power states of wireless devices. In IEEE 802.11 PSM, power management decisions to wake up wireless devices or put them to sleep states are made periodically in every beacon interval. In this paper, the authors demonstrate via a rigorous, analytical model (the result of which is corroborated by simulation results) that such a periodic structure together with its signaling overhead leads to both energy and bandwidth under-utilization. They, then devise SIMPA, a new power management protocol based on IEEE 802.11 PSM, to decouple the power management decision points and the beacon intervals, so as to allow fine grained control.
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