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We consider an energy harvesting transmitter broadcasting data to tworeceivers. Energy and data arrivals are assumed to occur at arbitrary but knowninstants. The goal is to minimize the total transmission time of the packetsarriving within a certain time window, using the energy that becomes availableduring this time. An achievable rate region with structural propertiessatisfied by the two-user AWGN BC capacity region is assumed. Structuralproperties of power and rate allocation in an optimal policy are established,as well as the uniqueness of the optimal policy under the condition that allthe data of the "weaker" user are available at the beginning. An iterativealgorithm, DuOpt, based on block coordinate descent that achieves the samestructural properties as the optimal is described. Investigating the ways tohave the optimal schedule of two consecutive epochs in terms of energyefficiency and minimum transmission duration, it has been shown that DuOptachieves best performance under the same special condition of uniqueness.

Optimal Offline Broadcast Scheduling with an Energy Harvesting Transmitter