Abstract:

In order to mitigate the co-tier and cross-tier interference in heterogeneous macro-femtocell networks, a novel interference mitigation scheme is proposed. Fractional frequency reuse, which divides all cells into different spatial regions, is applied in macrocell networks with the purpose of suppressing the co-tier interference among macrocell users (MUEs). Femtocells are able to find out the available sub-channels by cooperation sense techniques. The femtocell users (FUEs) are grouped into different clusters for limiting the co-tier interference among them by setting the interference threshold. Simultaneously, the power adjustment scheme is applied based on the cross-tier interference limitation. Finally, numerical results confirm that the proposed scheme can mitigate system interference and improve performance of the system more efficiently than the current scheme.