空闲模式能力对密集小小区网络的性能影响
Performance Impact of Idle Mode Capability on Dense Small Cell Networks
摘要：
最近的研究表明，在满载密集的小小区网络（SCN）中，覆盖概率性能将随着网络密集化而不断降低。IEEE ComSoc Technology News报道了这一新结果，标题为“密集化将是5G的死亡吗？”".在本文中，我们从现实网络部署的更实际的角度重新审视这个问题，例如有限数量的活动基站（BS）和用户设备（UE），随着网络致密化而降低的BS传输功率等。特别地，在密集SCN中，由于BS相对于UE的供应过剩，大量BS可以被置于空闲模式而没有信号传输，如果在它们的覆盖区域内没有活动UE，将这些BS设置为空闲模式减轻了不必要的小区间干扰并降低了能耗。在本文中，我们研究了密集SCN的BS空闲模式能力（IMC）的性能影响。不同于现有的工作，我们考虑一个现实的路径损耗模型，将视线（LoS）和非视线（NLoS）传输。此外，我们得到的分析结果的覆盖概率，面积频谱效率（ASE）和能源效率（EE）的性能与BS IMC的SCN，并表明，性能的影响密集SCN的IMC是显着的。随着密集SCN中BS密度超过UE密度，覆盖概率将不断向1增加，解决了先前对“5G死亡”的担忧。最后，在EE性能方面的性能改进也研究了密集的SCN使用实用的能源模型开发的绿色触摸项目。
英文摘要：
Very recent studies showed that in a fully loaded dense small cell network (SCN), the coverage probability performance will continuously decrease with the network densification. Such new results were captured in IEEE ComSoc Technology News with an alarming title of "Will Densification Be the Death of 5G?". In this paper, we revisit this issue from more practical views of realistic network deployment, such as a finite number of active base stations (BSs) and user equipments (UEs), a decreasing BS transmission power with the network densification, etc. Particularly, in dense SCNs, due to an oversupply of BSs with respect to UEs, a large number of BSs can be put into idle modes without signal transmission, if there is no active UE within their coverage areas. Setting those BSs into idle modes mitigates unnecessary inter-cell interference and reduces energy consumption. In this paper, we investigate the performance impact of such BS idle mode capability (IMC) on dense SCNs. Different from existing work, we consider a realistic path loss model incorporating both line-of-sight (LoS) and non-line-of-sight (NLoS) transmissions. Moreover, we obtain analytical results for the coverage probability, the area spectral efficiency (ASE) and the energy efficiency (EE) performance for SCNs with the BS IMC and show that the performance impact of the IMC on dense SCNs is significant. As the BS density surpasses the UE density in dense SCNs, the coverage probability will continuously increase toward one, addressing previous concerns on "the death of 5G". Finally, the performance improvement in terms of the EE performance is also investigated for dense SCNs using practical energy models developed in the Green-Touch project.
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