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In two-tier networks - comprising a conventional cellular network overlaid with shorter range femtocell hotspots - with universal frequency reuse, the near-far effect from cross-tier interference diminishes coverage for users in either tier. Equipping the macrocell and femtocell Base-Stations (BSs) with multiple antennas can enhance robustness against the near-far problem. Given a per-tier outage probability constraint, this work derives coverage radii wherein cross-tier interference bottlenecks cellular and hotspot coverage. Single-User (SU) multiple antenna transmission at each tier is shown to provide significantly superior coverage and spatial reuse relative to MultiUser (MU) transmission.
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