Dynamic Cell Size Adaptation and Intercell Interference Coordination in LTE HetNets

LTE heterogeneous networks (HetNets) are deployed in areas of high user density in order to increase the capacity in the cellular mobile network. However, they are raising two problems: fixed cell sizes and interference. In our work, we propose a technique, which is maximizing the throughput of the users while considering fairness, dynamically adapting cell sizes and reducing interferences. Moreover, we included the concept of cell selection offsets (CSOs) for the adaptation of the cell sizes and we applied protected subframes, a time domain intercell interference coordination technique in LTE advanced. In our results, we consider the system throughput and the 5-percentile UE throughput and show, that our technique outperforms the best static HetNet configurations achieving a gain up to 16.5% in terms of the fairness based system throughput and a gain up to 37.0% in the 5-percentile UE throughput.