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Although in cellular networks full-duplex and dynamic time-division duplexingpromise increased spectrum efficiency, their potential is so far challenged byincreased interference. While previous studies have shown thatself-interference can be suppressed to a sufficient level, we show that thecross-link interference for both duplexing modes, especially from base stationto base station, is the remaining challenge in multi-cell networks, restrictingthe uplink performance. Using beamforming techniques of low-complexity, we showthat this interference can be mitigated, and that full-duplex and dynamictime-division duplexing can substantially increase the capacity of multi-cellnetworks. Our results suggest that if we can control the cross linkinterference in full-duplex, then we can almost double the multi cell networkcapacity as well as user throughput. Therefore, the techniques in this paperhave the potentiality to enable a smooth introduction of full-duplex intocellular systems.

Full-Duplex and Dynamic-TDD: Pushing the Limits of Spectrum Reuse in Multi-Cell Communications