Abstract
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.
Highlights
How does the co-channel interference (CCI) affect the point of optimality for spectral and energy efficiencies? How to address: We describe in detail the CCI due to the presence of multiple mobile network operators (MNOs) operating at the spectrum using the almost blank subframe (ABS) based enhanced intercell interference coordination technique
The sessions or call arrivals can be modeled as a Poisson process [13,14] such that the traffic activity of user equipments (UEs) of an MNO when served by an in-building small cell base station (BS) could be modeled as an exponentially distributed continuous-time Poisson process
We have proposed a novel spectrum sharing technique to share the whole spectrum assigned to all mobile network operators (MNOs) of a country with small cells per building per MNO
Summary
Each mobile network operator (MNO) of a country is allocated with a dedicated licensed spectrum to serve its users’ traffic. Such static allocations of radio spectra were once sufficient to ensure user demands. To reuse the same dedicated spectrum for an MNO, techniques such as fractional frequency reuse [1] are useful to serve more users with reasonable data rate demands. In the dynamic spectrum allocation, the spectrum allocated to user equipments (UEs) of an MNO could be shared by UEs of another MNO such that the overall spectrum availability for an MNO could be increased to address high indoor data rates and capacity demands
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