Our research summarises the benefits and limitations of using spectrum at mm wavelengths for radio access in cellular networks. It discusses the engineering viability of using mm wavelengths for cellular use, but focuses on the assignment of spectrum in this band from a regulation and policy use point of view. In particular, the analysis considers whether mm wavelength spectrum should be used as licensed or unlicensed bands, or a combination of both, when used for cellular networks.
Our research shows that mm wavelengths for cellular use is best used where coverage is not expected to be continuous or ubiquitous, and used in areas where capacity demands cannot be met by using the UHF band. In addition our paper shows that there are benefits of assigning part of the mm wavelength band as unlicensed spectrum for private individuals or small networks, and part of the adjacent mm wavelength band as licensed spectrum for cellular operators.