Towards energy efficient VoIP over wireless LANs

Authors:
Vinod Namboodiri;Lixin Gao
Affiliations:
University of Massachusetts, Amherst, MA, USA;University of Massachusetts, Amherst, MA, USA
Venue:
Proceedings of the 9th ACM international symposium on Mobile ad hoc networking and computing
Year:
2008

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Abstract

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 we propose the GreenCall algorithm to derive sleep/wakeup schedules for the WLAN radio to save energy during VoIP calls. The schedules provided by GreenCall consider the energy versus loss-rate tradeoff to ensure application quality is preserved. We implement GreenCall on commodity hardware and study its performance and point out possible limitations. We further extensively evaluate the effect of diverse network paths and different application parameters on possible energy savings through trace-based simulations. We show that, in spite of the interactive, real-time nature of voice, a significant amount of energy can be conserved through GreenCall.