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, we can almost double the multi-cell network capacity as well as user throughput. Therefore, the techniques in this article have the potential to enable a smooth introduction of full duplex into cellular systems.

中文翻译：

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全双工和动态TDD：推动多小区通信中频谱复用的极限

尽管在蜂窝网络中，全双工和动态时分双工有望提高频谱效率，但迄今为止，其潜力仍受到干扰增加的挑战。尽管先前的研究表明可以将自干扰抑制到足够的水平，但我们表明两种双工模式（尤其是从基站到基站）的交叉链路干扰仍然是多小区网络中的剩余挑战，因此限制了上行链路性能。使用低复杂度的波束成形技术，我们表明可以减轻这种干扰，并且全双工和动态时分双工可以大大增加多小区网络的容量。我们的结果表明，如果我们可以控制全双工中的交叉链路干扰，我们几乎可以将多小区网络容量和用户吞吐量提高一倍。因此，本文中的技术具有将全双工顺利引入蜂窝系统的潜力。