Teletraffic performance of femtocell with overlay macrocell in cellular network

Nowadays the demand for cellular mobile phone has grown rapidly. If the cellular user population is increase there is a need to maximize the number of subscriber in the system. To achieve the goals of maximizing network capacity, hierarchical topology cell is being studied. In this hierarchical topology cell, femtocell is overlaid over the macrocell to handle overflow calls. Mobile subscriber is divided into two classes which are low and high mobility users. High mobility users assigned to macrocells and undergo handoff when crossing macrocell boundaries, while low mobility users assigned to femtocells and undergo handoff when crossing femtocell boundaries. A simulation model of macrocell/femtocell overlays in cellular network is developed. The simulation results show that there is a significant reduction of blocked calls rate while improving the Grade of Service (GOS) percentage in the network.