An energy-efficient delay reduction technique for supporting WLAN-based VoIP in SmartPhone
Journal of Systems Architecture: the EUROMICRO Journal
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Current IEEE 802.11 power saving schemes provide limited savings for VoIP specific wireless traffic. This paper characterizes traffic from the two most popular VoIP service providers in the United States with hopes of developing an improved approach to save power. It proposes a novel scheme, named Adaptive Microsleep (AMS), as well as an alternative scheme named Non-Adaptive Microsleep (NAMS). Both AMS and NAMS are well suited for power saving on mobile VoIP devices by increasing the amount of time the devices spend in a lowpower sleep state, but doing so without introducing additional delays that would noticeably deteriorate voice quality. Simulations show that both schemes successfully satisfy both of these primary goals, saving up to 83% power, while also meeting a secondary goal of not requiring large infrastructure changes to 802.11.