But for 5G to be 5G, we need to add small-cell technology in densely populated areas, which will increase network capacity.13 5G network infrastructure requirements involve mmWave frequencies, which can only cover a short distance.14 Consequently, we need an ultra-dense grid.15 Small cells can go on lamp posts and the side of buildings, but to compensate for the range limitations, multiple antennas are necessary to serve a specific area.