  Small cell networks are evolving as an economically viable solution to
ameliorate the capacity and coverage of state-of-the-art wireless cellular
systems. Nonetheless, the dense and unplanned deployment of the small cells
(e.g., femtocells, picocells) with restricted user access significantly
increases the impact of interference on the overall network performance. To
this end, this paper presents a novel framework to derive the statistics of the
interference considering dedicated and shared spectrum access for uplink
transmissions in two-tier small cell networks such as the macrocell-femtocell
networks. The derived expressions are validated by the Monte-Carlo simulations.
Numerical results are generated to assess the feasibility of shared and
dedicated spectrum access in femtocells under varying traffic load and spectral
reuse scenarios.
