Abstract
The volume of global mobile data traffic is expected to increase exponentially in the coming years. To enable this, disruptive solutions are required for 5th generation mobile networks (5G). Network capacity can be increased by enhancing spectral efficiency, cell density, as well as by procuring new spectrum. Considering the expected demand, all three will be essential. Millimeter wavelength (millimeter-wave) (30 GHz and above) spectrum was always known to be ample and underutilized, but was previously not considered favorable for mobile communications due to its radio propagation properties.While millimeter-waves offer more bandwidth than all of the spectrum below 6 GHz combined, they require a substantially different approach. A particular issue is the maximum length of a millimeter wave mobile access link; cell radii are estimated to be at most only hundreds of meters due to the unfavorable link budget. Millimeter waves will enable very dense cell layouts for extremely high network capacities.
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