Abstract
In third generation wireless network, the demand of wireless multimedia service is responsible for the enormous growth of data traffic. Cellular operators throughout the world are facing challenges in increasing system capacity, coverage and residential connectivity in sub-urban and urban environments due to the huge investment that follows. Femtocell offers an economically appealing way to improve quality, coverage and service in the existing network. Currently the use of femtocell is being supported primarily by the argument of improved indoor coverage for consumers and substantial cost savings for operators due to capacity offload. The Quality of Service is mainly effected by the limited bandwidth in wireless links. Femtocell can be an effective alternative to divert and carry out a big portion of the traffic from the Macro Base Station. The only issue in its vast implementation is lack of effective schemes to mitigate interference that creates challenge in maintaining customers' satisfaction. This paper presents the role of femtocell in heterogeneous network and discusses diverse interference mitigation techniques.