  Motivated by the intrinsic characteristics of mmWave technologies, we discuss
the possibility of an authorization regime that allows spectrum sharing between
multiple operators, also referred to as spectrum pooling. In particular,
considering user rate as the performance measure, we assess the benefit of
coordination among the networks of different operators, study the impact of
beamforming both at the base stations and at the user terminals, and analyze
the pooling performance at different frequency carriers. We also discuss the
enabling spectrum mechanisms, architectures, and protocols required to make
spectrum pooling work in real networks. Our initial results show that, from a
technical perspective, spectrum pooling at mmWave has the potential for a more
efficient spectrum use than a traditional exclusive spectrum allocation to a
single operator. However, further studies are needed in order to reach a
thorough understanding of this matter, and we hope that this paper will help
stimulate further research in this area.
