Cross-tier interference mitigation for self organized-self optimized femtocells

Maximizing frequency reuse is of high interest to multi-tier wireless cellular networks. The coexistence of macrocell and femtocell requires advanced cross-tier interference mitigation to satisfy the spectral efficiency sought for the evolution of cellular networks. In this paper, our proposal combines an opportunistic cancellation of the interference at the base station of the femtocell (HeNB) which mitigates dead zone occurrences at the femtocell premises in closed access regime, and a transmit power limitation on the femtocell mobile user for interference avoidance at the base station of the macrocell. Our proposed combination profits from the network infrastructure where successive interference cancellation does not apply, and neighbor discovery enabled at the HeNBs. Through simulation results and analysis, our proposal improves the underlay network performance with implementation of a self organized-self optimized network.