Soft Computing Based Power Control for Interference Mitigation in LTE Femtocell Networks

In heterogeneous networks (HetNet), transmit power control at Femtocell Access Point (FAP) is a major problem in reducing cross-tier interference, where providing better Quality of Service to femtocell users should be taken into account. Two novel transmit power control methods using soft computing techniques are introduced to tune the transmission power of femtocell access point with respect to the instantaneous Channel Quality Indicator measurement report received from the user equipment. Data rate of femtocell user is analyzed with fixed transmission power and the same with neuro-controller tuned and fuzzy logic controller tuned transmission power of serving femtocell access point. Simulation result verifies the effectiveness of the proposed power control methods by showing a significant improvement in data rate of user even at femtocell edge. Hence the femtocell users’ QoS is improved, even the femtocell access points are deployed at middle coverage area of macrocell and the same may lead to improvement in overall network capacity.