With the advent of 5G, communication in the mmW ave band (24-100 GHz) became one of the cornerstones of wireless communication research in the last years due to the large amount of available spectrum in said band, enabling the usage of bandwidths of up to 400 MHz [1]. Notably, operation in such bands entails a cell coverage shrinkage due to the worsening of the propagation conditions, partially compensated via beamforming techniques. Now, in advancing beyond 5G (B5G), the shift towards subTHz (90-300 GHz) and THz(0.3-10 THz) bands seems inevitable in order to harvest even broader bandwidths. This transition will further worsen channel conditions and shrink cell coverage, calling for Ultra-Dense Cell (UDC) deployments. In this work, we forecast frequency bands, communication bandwidths, antenna array sizes, and spatial multiplexing capabilities for B5G deployments to assess their impact on cell range and fronthaul (FH) capacity. Our work advances the state of the art in that it analyzes potential B5G configurations in terms of bandwidth, antenna, and layer numbers, as well as exploring non-standard functional splits (e.g., splits 7a, 7c, 7e). Fig. 1 shows the achievable signal-to-noise-ratio (SNR) against the cell coverage range for the downlink (DL) of a cellular system operating at bands 3.5-90 GHz, with path-loss model in [2]. By example, to ensure a target SNR=10 dB, densification requirements increase from a cell range (distance between base station, BS, and user equipment, UE) of 800 m(3.5 GHz) to 150 m(90 GHz).