Dynamic power tuning for downlink interference mitigation in heterogeneous LTE network

Heterogeneous Long Term Evolution (LTE) network comprising femtocells leads to cross-tier interference that arises between macrocells and femtocells in both uplink and downlink degrading the performance of the cellular system. The downlink interference from the femtocell to Macro User Equipments (MUE) being the most serious interference case is focused in this work. A power tuning technique has been proposed to mitigate this interference taking into consideration the number of User Equipments present in the interfering femtocells along with the information received from the interfered MUE. Simulation results show that this scheme mitigates the interference to the MUE effectively while the total transmission power of femtocells also reduce in the process of interference mitigation which is an added benefit obtained effortlessly in the dense deployment of femtocells.