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