Capacity Scaling of Cellular Networks: Impact of Bandwidth, Infrastructure Density and Number of Antennas
Capacity Scaling of Cellular Networks: Impact of Bandwidth, Infrastructure Density and Number of Antennas
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DOI：
10.1109/twc.2017.2769054
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发表时间：
2017-05
影响因子：
10.4
通讯作者：
Felipe Gómez-Cuba;E. Erkip;S. Rangan;F. González-Castaño
中科院分区：
文献类型：
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作者：
Felipe Gómez-Cuba;E. Erkip;S. Rangan;F. González-Castaño
毫米波频段的超宽频谱与大型天线阵列和超密集网络相结合的可用性提出了两个基本问题：过度丰富的自由度的真正价值是什么？如何设计网络以充分利用它们？本文确定了容量缩放的大型蜂窝网络的带宽，面积，天线数量和基站密度的函数。结果发现，网络容量有一个基本的带宽扩展限制，超过该限制，网络变得功率受限。基础设施多跳协议实现了所有网络参数的最佳网络容量缩放。相比之下，目前的协议，只使用单跳直接传输不能实现的容量缩放在宽带制度，除非在特殊情况下，当基站的密度是不切实际的极端。这一发现表明，多跳通信将是重要的，以充分实现下一代蜂窝网络的潜力。如果足够密集，专用中继也可以执行此任务，从而使用户节点免于协作的电池消耗。另一方面，更复杂的策略，如分层合作，这是必不可少的实现能力扩展的ad hoc网络，是不必要的蜂窝上下文中。
The availability of very wide spectrum in millimeter wave bands combined with large antenna arrays and ultra-dense networks raises two basic questions: What is the true value of overly abundant degrees of freedom and how can networks be designed to fully exploit them? This paper determines the capacity scaling of large cellular networks as a function of bandwidth, area, number of antennas, and base station density. It is found that the network capacity has a fundamental bandwidth scaling limit, beyond which the network becomes power-limited. An infrastructure multi-hop protocol achieves the optimal network capacity scaling for all network parameters. In contrast, current protocols that use only single-hop direct transmissions cannot achieve the capacity scaling in wideband regimes except in the special case when the density of base stations is taken to impractical extremes. This finding suggests that multi-hop communication will be important to fully realize the potential of next-generation cellular networks. Dedicated relays, if sufficiently dense, can also perform this task, relieving user nodes from the battery drain of cooperation. On the other hand, more sophisticated strategies such as hierarchical cooperation, that are essential for achieving capacity scaling in ad hoc networks, are unnecessary in the cellular context.