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With the rapidly increasing number of deployed LTE femtocell base stations(FBS), energy consumption of femtocell networks has become a seriousenvironmental issue. Therefore, energy-efficient protocols are needed tobalance the trade-off between energy saving and bandwidth utilization. The keycomponent of the desired protocol to prevent both energy and bandwidth waste isinterference mitigation, which, nevertheless, most previous work has failed toproperly consider. To this end, in this paper, we manipulate user equipment(UE) association and OFDMA scheduling with a combination of interferencemitigation. Recognizing the NP-hardness of the problem, we propose twodistributed algorithms with guaranteed convergence. Extensive simulations showthat our algorithms outperform the alternative algorithms in multiple metricssuch as utility, power consumption, and convergence speed.

Energy Efficient Medium Access with Interference Mitigation in LTE Femtocell Networks