  Multi-antenna technologies such as massive Multiple-Input Multiple-Output
(massive MIMO) and beamforming are key features to enhance performance, in
terms of capacity and coverage, by using a large number of antennas
intelligently. With the upcoming 5G New Radio (NR), FD-MIMO (Full Dimension
MIMO) will play a major key role. FD-MIMO consists in arranging a large number
of antennas in a 2D array, which enables to use 3D beamforming i.e.,
beamforming in both horizontal and vertical dimensions. The present paper
provides a 3D beamforming model where beam steering depends on the random
spatial distribution of users. We attempt to derive some analytical results
regarding the probability distribution of antenna beamforming radiation
pattern. Also, through system level simulations, we show how 3D beamforming can
reduce interference impact, compared to the traditional 2D beamforming, and
enhances system performance in terms of the coverage probability and users
throughput.
