A joint channel-aware and buffer-aware scheduling for energy-efficient transmission over fading channels with long coherent time

Abstract

Joint channel-aware and buffer-aware scheduling along with rate/power adaptation is a promising solution to assure Quality of Service (QoS) and improve energy efficiency. In this paper, an analytical delay-power tradeoff and optimal threshold-based scheduling are proposed. In particular, we are interested in the scheduling policies where the scheduler only needs to decide transmitting or not. More specifically, we shall focus on the slow fading scenario, where channel coherent time is long enough to transmit several data packets. We formulate a linear programming problem where the average delay is minimized given an average power constraint. By deriving the analytical solution to this linear programming, the optimal delay-power tradeoff and the optimal scheduling policy are presented.