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While scheduling transmissions in a wireless communications system can result in significant power savings, a realistic scheduling scheme must take into acvount practical constraints that apply to wireless transmitters. Here, the authors examine scheduling actions for power efficiency under the constraints that physical transmission may be carried out at a set of fixed K non-zero rates. For this class of schedulers, they derive the optimal scheduling policy under specified average delay constraints for the simple case when K=1 under constant channel conditions. They also derive bounds on both the achievable delays as well as power performances for a general K-rate scheduler.
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