International Journal of Computer Science and Management Studies (IJCSMS)
Cellular networks play a central role in the people global networking and communication infrastructure. To ensure and even enhance availability, the standardization process of new communication systems is governed by concerns about reliability, interoperability and security, besides trying to improve the performance of current technology. Still, the ever-increasing demand for higher data-rates forces the consideration of novel research results during standardization. In a heterogeneous network, nodes with different transmission powers and processing capabilities co-exist and User Equipments (UEs) can choose to access one or more of the nodes. Long Term Evolution (LTE) a is the next step forward in cellular 3G services.