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Intelligent Packet Dropping for Optimal Energy-Delay Tradeoffs in Wireless Downlinks

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1 Author(s)
Neely, M.J. ; Electr. Eng. Dept., Univ. of Southern California, Los Angeles, CA

We explore the advantages of intelligently dropping a small fraction of packets that arrive for transmission over a time varying wireless downlink. Without packet dropping, the optimal energy-delay tradeoff conforms to a square root tradeoff law, as shown by Berry and Gallager (2002). We show that intelligently dropping any non-zero fraction of the input rate dramatically changes this relation from a square root tradeoff law to a logarithmic tradeoff law. Further, we demonstrate an innovative algorithm for achieving this logarithmic tradeoff without requiring a-priori knowledge of arrival rates or channel probabilities. The algorithm can be implemented in real time and easily extends to yield similar performance for multi-user systems.

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Automatic Control, IEEE Transactions on  (Volume:54 ,  Issue: 3 )