Optimizing transmission and shutdown for energy-efficient real-time packet scheduling in clustered ad hoc networks

Authors:
Sofie Pollin;Bruno Bougard;Rahul Mangharam;Francky Catthoor;Ingrid Moerman;Ragunathan Rajkumar;Liesbet Van der Perre
Affiliations:
Wireless Research, IMEC, Leuven, Belgium and ESAT/INSYS, Katholieke Universiteit Leuven, Leuven, Belgium;Wireless Research, IMEC, Leuven, Belgium and ESAT/INSYS, Katholieke Universiteit Leuven, Leuven, Belgium;Wireless Research, IMEC, Leuven, Belgium and Real-Time & Multimedia Systems Laboratory, Carnegie Mellon University, Pittsburgh, PA;Wireless Research, IMEC, Leuven, Belgium and ESAT/INSYS, Katholieke Universiteit Leuven, Leuven, Belgium;Wireless Research, IMEC, Leuven, Belgium and INTEC, Universiteit Gent, Gent, Belgium;Real-Time & Multimedia Systems Laboratory, Carnegie Mellon University, Pittsburgh, PA;Wireless Research, IMEC, Leuven, Belgium
Venue:
EURASIP Journal on Wireless Communications and Networking
Year:
2005

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Abstract

Energy efficiency is imperative to enable the deployment of ad hoc networks. Conventional power management focuses independently on the physical or MAC layer and approaches differ depending on the abstraction level. At the physical layer, the fundamental tradeoff between transmission rate and energy is exploited, which leads to transmit as slow as possible. At MAC level, power reduction techniques aim to transmit as fast as possible to maximize the radios power-off interval. The two approaches seem conflicting and it is not obvious which one is the most appropriate. We propose a transmission strategy that optimally mixes both techniques in a multiuser context. We present a cross-layer solution considering the transceiver power characteristics, the varying system load, and the dynamic channel constraints. Based on this, we derive a low-complexity online scheduling algorithm. Results considering an M-ary quadrature amplitude modulation radio show that for a range of scenarios a large power reduction is achieved, compared to the case where only scaling or shutdown is considered.