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Wireless LAN (WLAN) radios conserve energy by staying in sleep mode. With real-time applications like VoIP, it is not clear how much energy can be saved by this approach since packets delayed above a threshold are lost. In this work the author proposes the GreenCall algorithm to derive sleep/wakeup schedules for the WLAN radio to save energy during VoIP calls. The schedules provided by Green-Call consider the energy versus loss-rate tradeoff to ensure application quality is preserved. The paper implements GreenCall on commodity hardware and studies its performance and point out possible limitations. The paper further extensively evaluates the effect of diverse network paths and different application parameters on possible energy savings through trace-based simulations.
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