Outage and capacity of heterogeneous cellular networks with intra-tier dependence

In this paper, we propose a two-tier heterogeneous cellular network (HCN) model with intra-tier dependence, where the macro base stations (MBSs) and the pico base stations (PBSs) follow a Poisson point process (PPP) and a Matern cluster process (MCP), respectively. Due to the high spatial fluctuations of the traffic demand, the users are modeled as a Cox process. Conditioning on a fixed distance between a user equipment (UE) and its nearest serving BS, exact calculations of the interference and the outage probability are derived. The per-user capacity and the area spectral efficiency are also analyzed. The results show that the model with intra-tier dependence appears closer to the real deployment than the extreme with the complete randomness (the PPP). An important conclusion is that both the per-user capacity and the area spectral efficiency improve with smaller cells, but outage does not.