Optimal Fixed and Scalable Energy Management for Wireless Networks

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Real-Time and Embedded Systems Lab (mLAB)
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Energy-Efficient Wireless Systems
Electrical and Computer Engineering
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Pollin, Sofie
Bougard, Bruno
Rajkumar, Ragunathan
Catthoor, Francky
Van der Perre, Liesbet
Moerman, Ingrid

In many devices, wireless network interfaces consume upwards of 30% of scarce portable system energy. Extending the system lifetime by minimizing communication power consumption has therefore become a priority. Conventional energy management techniques focus independently on minimizing the fixed energy consumption of the transceiver circuit or on scalable transmission control. Fixed energy consumption is reduced by maximizing the transceiver shutdown interval. In contrast, variable transmission rate, coding and power can be leveraged to minimize energy costs. These two energy management approaches present a tradeoff in minimizing the overall system energy. For example, variable energy costs are minimized by transmitting at a lower modulation rate and transmission power, but this also shortens the sleep duration thereby increasing fixed energy consumption. We present a methodology for energy-efficient resource allocation across the physical layer, communications layer and link layer. Our methodology is aimed at providing QoS for multiple users with bursty MPEG-4 video over a time-varying channel. We evaluate our scheme by exploiting control knobs of actual RF components over a modified IEEE 802.11 MAC. Our results indicate that the system lifetime is increased by a factor of 2 to 5 compared to the gains of conventional techniques.

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Real-Time and Embedded Systems Lab (mLAB)
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Suggested Citation: R. Mangharam, S. Pollin, B. Bougard, R. Rajkumar, F. Catthoor, L. Van der Perre, I. Moerman "Optimal fixed and scalable energy management for wireless networks" IEEE Conference on Computer Communications (INFOCOM'05) , Miami, Fl, USA, March 2005. ©2005 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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