Minimizing Energy for Wireless Web Access with Bounded Slowdown

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Minimizing Energy for Wireless Web Access with Bounded Slowdown (2002)

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by Ronny Krashinsky , Hari Balakrishnan

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@MISC{Krashinsky02minimizingenergy,
    author = {Ronny Krashinsky and Hari Balakrishnan},
    title = {Minimizing Energy for Wireless Web Access with Bounded Slowdown},
    year = {2002}
}

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Abstract

On many battery-powered mobile computing devices, the wireless network is a significant contributor to the total energy consumption. In this paper, we investigate the interaction between energy-saving protocols and TCP performance for Web-like transfers. We show that the popular IEEE 802.11 power-saving mode (PSM), a "static" protocol, can harm performance by increasing fast round trip times (RTTs) to 100 ms; and that under typical Web browsing workloads, current implementations will unnecessarily spend energy waking up during long idle periods. To overcome these problems, we present the Bounded-Slowdown (BSD) protocol, a PSM that dynamically adapts to network activity. BSD is an optimal solution to the problem of minimizing energy consumption while guaranteeing that a connection's RTT does not increase by more than a factor p over its base RTT, where p is a protocol parameter that exposes the trade-off between minimizing energy and reducing latency. We present several trace-driven simulation results that show that, compared to a static PSM, the Bounded-Slowdown protocol reduces average Web page retrieval times by 5-64%, while simultaneously reducing energy consumption by 1-14% (and by 13x compared to no power management).

Keyphrases

bounded slowdown wireless web access energy consumption popular ieee optimal solution static psm protocol parameter base rtt energy-saving protocol idle period static protocol significant contributor wireless network round trip time typical web browsing workload tcp performance present several trace-driven simulation result web-like transfer network activity current implementation power management power-saving mode total energy consumption

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