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Degrees of freedom of cellular networks: Gain from full-duplex operation at a base station

机译：蜂窝网络的自由度：来自基站的全双工操作的收益

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In this paper, we study the degrees of freedom (DoF) of cellular networks in which a base station with full-duplex operation simultaneously communicates to multiple half-duplex mobile stations. The half-duplex mobile stations are assumed to either communicate with the base station in the uplink or downlink. For such networks, inter-terminal interference needs to be taken into account to achieve the potential gain that doubles the throughput of conventional half-duplex cellular networks. We provide an achievable total DoF for such networks and show that having full-duplex operation at the base station only can indeed double the DoF when the number of mobile stations is sufficiently greater than the number of antennas at the base station. The key idea is to utilize the full DoF for the uplink transmission, while minimizing the inter-terminal interference via interference alignment. The downlink communication rate is then carefully chosen to occupy the remaining DoF at the receiving mobile stations.
机译：在本文中，我们研究了具有全双工操作的基站同时与多个半双工移动站进行通信的蜂窝网络的自由度（DoF）。假设半双工移动站在上行链路或下行链路中与基站进行通信。对于这样的网络，需要考虑终端间干扰以获得​​可能的增益，该增益使传统的半双工蜂窝网络的吞吐量增加一倍。我们为此类网络提供了可实现的总DoF，并显示出只有在移动站的数量远远大于基站的天线数量时，在基站进行全双工操作才可以使DoF真正翻一番。关键思想是利用完整的DoF进行上行链路传输，同时通过干扰对齐将终端间干扰降至最低。然后，仔细选择下行链路通信速率，以在接收移动台处占据剩余的DoF。

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