Handling cross-tier interference in underlay macrocell system for future small cell networks

Spectrum sharing technology optimizes the usage of li- censed spectrum. Macrocell underlaid with femtocells constitutes a typical two-tier network for improving spectral efficiency and indoor coverage. Considering the end-user access control over a femtocell base station (FBS), with shared usage of the macrocell's spectrum, we propose a cross-tier interference management be- tween the FBS and the macrocell base station (MBS).Our proposal uses the network infrastructure for interference cancellation at the FBS. Besides, we profit from terminal discovery to derive the inter- ference level from the femtocell to the macrocell. Thus, addition- ally we propose a power control method without cooperation from the MBS. Through simulation results and analysis, our proposal improves the underlay network performance for future advanced small cell networks.