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Open AccessFeature PaperArticle

Countrywide Mobile Spectrum Sharing with Small Indoor Cells for Massive Spectral and Energy Efficiencies in 5G and Beyond Mobile Networks

Radio and Spectrum Laboratory, KDDI Research Inc., 2-1-15 Ohara, Fujimino-shi 356-8502, Saitama, Japan
This paper is an extended version of paper published in the 2019 IEEE International Symposium on Dynamic Spectrum Access Networks (IEEE DySPAN), Newark, NJ, USA, 11–14 November 2019.
Energies 2019, 12(20), 3825; https://doi.org/10.3390/en12203825
Received: 8 September 2019 / Revised: 29 September 2019 / Accepted: 2 October 2019 / Published: 10 October 2019
In this paper, we propose a technique to share the licensed spectrums of all mobile network operators (MNOs) of a country with in-building small cells per MNO by exploiting the external wall penetration loss of a building and introducing the time-domain eICIC technique. The proposed technique considers allocating the dedicated spectrum Bop per MNO only its to outdoor macro UEs, whereas the total spectrum of all MNOs of the country Bco to its small cells indoor per building such that technically any small indoor cell of an MNO can have access to Bco instead of merely Bop assigned only to the MNO itself. We develop an interference management strategy as well as an algorithm for the proposed technique. System-level capacity, spectral efficiency, and energy efficiency performance metrics are derived, and a generic model for energy efficiency is presented. An optimal amount of small indoor cell density in terms of the number of buildings L carrying these small cells per MNO to trade-off the spectral efficiency and the energy efficiency is derived. With the system-level numerical and simulation results, we define an optimal value of L for a dense deployment of small indoor cells of an MNO and show that the proposed spectrum sharing technique can achieve massive indoor capacity, spectral efficiency, and energy efficiency for the MNO. Finally, we demonstrate that the proposed spectrum sharing technique could meet both the spectral efficiency and the energy efficiency requirements for 5G mobile networks for numerous traffic arrival rates to small indoor cells per building of an MNO. View Full-Text
Keywords: spectrum sharing; multiple-operator; eICIC; small cell; nationwide; spectral efficiency; energy efficiency; 5G spectrum sharing; multiple-operator; eICIC; small cell; nationwide; spectral efficiency; energy efficiency; 5G
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MDPI and ACS Style

Saha, R.K. Countrywide Mobile Spectrum Sharing with Small Indoor Cells for Massive Spectral and Energy Efficiencies in 5G and Beyond Mobile Networks. Energies 2019, 12, 3825.

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