Realizing the full potential of PSM using proxying

Abstract—The WiFi radio in smartphones consumes a significant portion of energy when active. To reduce the energy consumption, the Power Saving Mode was standardized in IEEE 802.11 and two major implementations, Static PSM and Dynamic PSM, have been widely used in mobile devices. Unfortunately, both PSMs have inherent drawbacks: Static PSM is energy efficient but imposes considerable extra delays on data transfers; Dynamic PSM incurs little extra delay but misses energy saving opportunities. In this paper, we first analyze a one-week trace from 10 users and show that more than 80% of all traffic are Web 2.0 flows, which are of very small sizes and short durations. Targeting these short but dominant flows, we propose a system called Percy, to achieve the best of both worlds (Static and Dynamic PSM), i.e., to maximize the energy saving while minimizing the delay of flow completion time. Percy works by deploying a web proxy at the AP and suitably configuring the PSM parameters, ...

• Type: Journal
• Year: 2012
• Where: INFOCOM
• Authors: Ning Ding, Abhinav Pathak, Dimitrios Koutsonikolas, Clayton Shepard, Y. Charlie Hu, Lin Zhong
• Keywords: Communications, Energy Consumption, INFOCOM 2012, Internet Servers, Web Proxy