Energy Consumption is becoming a critical concern that directly affect the mobility and lifetime of mobile and embedded systems. Different embedded and mobile applications place different demands on the wireless communication system and thus the energy consumption of the wireless cards. Past work has studied managing the energy consumed in wireless cards; we sought to evaluate some of these techniques by implementing them on our system and measuring the actual energy consumption by the wireless card. We tested two schemes. The first increases the card's sleeping duration allowing power to be reduced by putting the card in low power states for longer times. The second technique is more aggressive; the power manager completely shuts-down the card during idle periods. When applying these two techniques for an email application, we get 25% energy savings for extending the sleep time up to 60 sec, while the savings reaches 89% when shutting down the card for the same duration. Notes:
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