Abstract
Femtocells home base station, which are low power cellular base station that operate in licensed spectrum, installed on the subscriber's premises to provide cellular services within home, residences, apartment complexes, business offices and outdoor hotspot scenarios connected with the internet and cellular operator networks via digital subscriber line (DSL) router or cable modem, to improve coverage, provide, high data throughput, better voice services. This paper surveys femtocell technology, describes the key challenges facing femto network and it presents the future direction on applying planning and optimization to enhance femtocell performance, a detailed discussion about the interference management between the legacy hierarchical and flat architectures, where cell planning processes used in microcell networks which are not scaled to support millions of femtocells problem and its recent researches are discussed and reviewed.