Overlapping cells in femtocell environment

To smoothly and simply deploy femtocells in today´s mobile networks, self-organizing capabilities have to be essentially part of Femto Access Points (FAPs). This paper discuses an automatic cell identifier assignment procedure with the focus on collision events that can be viewed as an overlapping circle problem. We investigate a number of neighboring FAPs when randomly placing them within a macrocell. Various combinations of femtocell densities and femtocell radii are taken into account in our analysis. Based on simulation results, we derive an analytical expression that can be used to find out the maximum number of neighboring FAPs.