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In this paper, the authors investigate the performance of opportunistic scheduling for delivering multicast information in an OFDM-based cellular network. The problem is formulated as a system throughput maximization problem subject to the fairness constraints derived from each user's specific minimum QoS requirement. As a solution they design an opportunistic scheduling algorithm based on a priority metric that follows an exponential rule. The metric takes into account the current channel state information to take advantage of the better channel states observed by different subsets of the multicast users at different time slots and sub-bands in order to increase the system throughput. The metric also explicitly includes a term to compensate the deviations observed by individual users from their QoS targets.
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