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Due to the increasing spatial irregularity of cellular systems, point process models are ideally suited for analysis and simulation. When modeling multiple tiers, including macro-, micro-, and femto-tiers, a natural choice is the superposition of independent Poisson Point Processes (PPPs), each one modeling the locations of the base stations of a particular tier. The authors propose a new model for heterogeneous cellular networks that incorporates dependencies between the layers. In particular, it places lower-tier base stations at locations that are poorly covered by the macrocells, and it includes a small-cell model for the case where the goal is to enhance network capacity.
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