Abstract
Mobile communication systems are growing steadily. In addition, users require better quality of service and large coverage offering a high quality of signal. To meet these challenges, a new concept named heterogeneous network (Het-Net) has been adopted. The Het-Net is a network deploying different types of cells (from a macro shape up to femto ones). Operators look to improve the performance of their networks and to remedy the problem of areas with low coverage. However, the coexistence of these different cell models causes interference at the downlink which can affect offered signal's quality. This interference results therefore performance degradation. Therefore, a novel intercell interference mitigation scheme, based on frequency and power domain, is proposed in order to reduce interference in Het-Net long-term evolution-advanced. In frequency domain, the macrocell has to allocate a frequency band by using fractional frequency reuse scheme and the femtocells choose subbands that are not used in the macrocell sector to reduce interference. On the other hand, the small cells transmitted powers are controlled for limiting the interference imposed by it on the other users in the cell area. Simulation results show that the proposed scheme enhances the signal to interference plus noise ratio of macro and femto users and the overall throughput in the network.