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With millimeter wave bands emerging as a strong candidate for 5G cellularnetworks, next-generation systems may be in a unique position where spectrum isplentiful. To assess the potential value of this spectrum, this paper derivesscaling laws on the per mobile downlink feasible rate with large bandwidth andnumber of nodes, for both Infrastructure Single Hop (ISH) and InfrastructureMulti-Hop (IMH) architectures. It is shown that, for both cases, there exist\emph{critical bandwidth scalings} above which increasing the bandwidth nolonger increases the feasible rate per node. These critical thresholds coincideexactly with the bandwidths where, for each architecture, the networktransitions from being degrees-of-freedom-limited to power-limited. For ISH,this critical bandwidth threshold is lower than IMH when the number of usersper base station grows with network size. This result suggests that multi-hoptransmissions may be necessary to fully exploit large bandwidth degrees offreedom in deployments with growing number of users per cell.

Scaling Laws for Infrastructure Single and Multihop Wireless Networks in Wideband Regimes