Abstract
This paper investigates the problem of energy-efficient packet transmission with arbitrary arrival instants and deadline constraints over a point-to-point additive white Gaussian noise (AWGN) channel. This is different from previous work where it is assumed that the packets follow a First-In-First-Out (FIFO) order in that a packet that arrives earlier has a deadline that is also earlier. We first investigate the necessary and sufficient conditions of the optimal transmission schedule. We then propose an algorithm which finds the transmission schedule of each packet. Next, we show that our algorithm satisfies the sufficient conditions of the optimal transmission schedule and thus, is optimal. Finally, simulation results show that the proposed policy can achieve significant energy savings compared to the existing FIFO policy.
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