Interference Management in LTE Femtocell Systems Using an Adaptive Frequency Reuse Scheme

Long Term Evolution (LTE) has developed a new technology in order to enhance indoor coverage. This new technology is called femtocells and is achieved with the use of access points installed by home users. However, interference problem between the femtocell and the macrocell decreases the system's capacity and as a result users' throughput. In this paper, the authors study the interference mitigation techniques in femtocell/macrocell networks and they propose a frequency reuse mechanism that leads to increased overall system performance. In particular, the mechanism aims to maximize throughput via a variety of combinations between inner cell radius and frequency allocation to the macrocell. Additionally, a position minded frequency allocation to the femtocells targets to further optimize the total throughput of the cell.