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In this paper, the authors aim to develop an energy-efficient multiuser Time-Division Multiple-Access (TDMA) system in BlockFading (BF), subject to individual user's Quality-of-Service (QoS) requirements in terms of outage probability, by jointly-adaptive time-sharing and power allocation for the users in accordance with the causal Channel Side Information (CSI) at the transmitter. They first propose a simple closed-form power allocation solution for a single-user BF channel to attain a given outage probability constraint with causal CSI. Then, they construct an optimization problem to permit a joint consideration of power consumptions and QoS requirements of the users, which they solve to obtain a near-optimal solution for users' time-sharing.
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