Before revision:  In particular , we show that smaller antenna beamwidths and, unlike bi-dimensional mmWave cellular networks, smaller BS densities do not necessarily have a disruptive impact on improving the SINR outage probability , and consequently the rate coverage probability .
After revision:  In particular , we show that reducing the horizontal beamwidth from 90^\circ to 30^\circ determines a minimal reduction in the SINR outage probability (namely, 4 \cdot 10^{-2 unlike bi-dimensional mmWave cellular networks, smaller BS densities do not necessarily have a disruptive impact on improving the SINR outage probability , and consequently the rate coverage probability .