We study opportunistic scheduling and the sum capacity of cellular networkswith a full-duplex multi-antenna base station and a large number ofsingle-antenna half-duplex users. Simultaneous uplink and downlink over thesame band results in uplink-to-downlink interference, degrading performance. Wepresent a simple opportunistic joint uplink-downlink scheduling algorithm thatexploits multiuser diversity and treats interference as noise. We show that inhomogeneous networks, our algorithm achieves the same sum capacity as whatwould have been achieved if there was no uplink-to-downlink interference,asymptotically in the number of users. The algorithm does not requireinterference CSI at the base station or uplink users. It is also shown that fora simple class of heterogeneous networks without sufficient channel diversity,it is not possible to achieve the corresponding interference-free systemcapacity. We discuss the potential for using device-to-device side-channels toovercome this limitation in heterogeneous networks.
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