Interference mitigation in mobile environment through power adjustment in macro and femto cell systems

In heterogeneous networks, a severe downlink interference from femtocells should be controlled centrally to increase the performance requirement of macrocell users. This paper proposes a power control mechanism for interference mitigation in a mobility environment where macrocells and femtocells are co-located together. The key benefits of this scheme is to achieve higher performance for non closed subscriber group (CSG) users, as well as avoiding potential service degradation of femtocell users by taking into account mobile users locations and SINR at both macro and femtocell sides. In addition, we propose an algorithm at the network side to decrease the signaling overload caused by the proposed centralized power control scheme. Simulation results show that our proposals provide a better performance in terms of signalling overhead and throughput of macrocell users while maintaining a high QoS for femtocell users.