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Techno-Economic Trade-off of Small Cell 5G Networks

Teixeira, E.S.B.Teixeira ; Ramos, A. ; Lourenço, ML ; Velez, F. J. ; Peha, J.

Techno-Economic Trade-off of Small Cell 5G Networks, Proc Conf. on Telecommunications - ConfTele, Lisboa, Portugal, Vol. , pp. - , June, 2019.

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Abstract
This paper studies the techno-economic aspects at Super High Frequency (SHF) and millimetre wavebands (mmWaves). The variation of the carrier-to-noise-plus-interference ratio with the coverage distance is evaluated, by considering two different path loss models, the two-slope urban micro Line-of-Sight (UMiLoS), for SHF band (from the ITU-R 2135 Report) and the modified Friis propagation model, for frequencies above 24 GHz. The equivalent supported throughput is estimated at the 5.62, 28, 38, 60 and 73 GHz frequency bands and the impact of carrier-to-noise-plus-interference ratio in the radio and network optimization process is investigated. Mainly due to the reduction caused by the behaviour of the two-slope propagation model for SHF band, the supported throughput at these bands is higher than at the millimetre wavebands, only for the longest cell lengths. The cost/revenue trade-off of these pico-cellular networks was analysed for regular cellular topologies, by considering unlicensed spectrum. Due to the oxygen absorption excess, we can perceive an optimum of the revenue in percentage terms for values of the cell length, R, equal to 15 m and a decreasing behaviour after this optimum value at 60 GHz, while for the 28, 38 and 73 GHz bands the profit starts to decrease after R ≈ 10 m. It is possible to observe that, for the 5.62 GHz band, the profit is slightly inferior than for millimetre wavebands, for the shortest Rs, and starts to increase for cell lengths approximately equal to the ratio between the break-point distance and the co-channel reuse factor, achieving a maximum for values of R approximately equal to 1000 m.