Minimizing energy consumption is crucial for portable wireless stations because they operate on a limited battery supply. For example, the IEEE 802.11 standard includes a mechanism called Power-Saving Mode (PSM), which allows a network interface on a mobile station to enter a sleep state whenever possible to reduce its energy consumption. This paper considers a generic wireless system composed of an Access Point (AP) and several stations that offer a PSM to its users. The PSM is AP-centric (i.e., gives control to the AP) to save more energy. The paper formulates a downlink scheduling optimization problem aimed at saving energy and proposes two heuristic scheduling policies to solve it.
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