The FD communication technique has been recently proposed as a new paradigm to increase the spectral efficiency of wireless systems. In this article, we investigate the application of FD communications to ultra-dense heterogeneous networks where small base stations can work in the FD mode. In such networks, it is a challenging task to coordinate various kinds of interference caused by FD communications, including self-interference, intra-cell and inter-cell uplink-todownlink interference. To deal with it, we have developed a novel ICIC scheme, which consists of four steps: base station association, user pairing and mode selection, power control, and resource block allocation. The implementation issue of the proposed scheme is also discussed. Simulation results demonstrate that our proposed ICIC scheme can effectively harvest the FD gain for ultra-dense heterogeneous networks. Finally, several important future directions and open challenges are identified in this article.

中文翻译：

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具有全双工小型蜂窝基站的超密集异构网络


FD通信技术最近被提出作为提高无线系统频谱效率的新范例。在本文中，我们研究了FD通信在超密集异构网络中的应用，其中小型基站可以在FD模式下工作。在这样的网络中，协调由FD通信引起的各种干扰，包括自干扰、小区内和小区间的上下行干扰是一项具有挑战性的任务。为了解决这个问题，我们开发了一种新颖的 ICIC 方案，该方案由四个步骤组成：基站关联、用户配对和模式选择、功率控制和资源块分配。还讨论了拟议方案的实施问题。仿真结果表明，我们提出的 ICIC 方案可以有效地获得超密集异构网络的 FD 增益。最后，本文确定了几个重要的未来方向和开放挑战。