International Journal of Engineering Sciences & Research Technology (IJESRT)
Heterogeneous network is a network connecting computers and other devices with different operating systems. Wireless networking is becoming an increasingly important and popular way of providing global information access to users. In a fourth generation communication system, consisting of diverse variety of wireless access standards, network availability, coverage and quality of services may rapidly change depending upon the device mobility and fading suffered by the signal. The main challenges for seamless mobility is the availability of simple and robust vertical handoff algorithms, which allow a mobile node to roam among heterogeneous wireless networks.