Interference mitigation in heterogeneous cellular networks of macro and femto cells

We investigate the impact of co-channel deployment of femtocells on the existing macro-cellular systems considering the techniques to resolve the laud neighbor problem. There are several approaches to this aim, e.g., femtocell power control, interference coordination, opening access to femtocells and so on. Among them, the coordinated scheduling, including power control, and their impact will be the main focus of this work. In the context of 3GPP-LTE, we examine under various operational scenarios the performance in terms of the average and 5% worst user throughput, a useful measure of fairness among users, both for femto and macro cells. Although recent studies have shown that co-channel femtocell has minor impact on the macrocell performance in average sense, non-negligible percentage of users may lose their opportunity to get satisfactory data service and, hence, our focus will be put more on 5% worst users.