International Journal of Advanced Research in Computer Science and Software Engineering (IJARCSSE)
Next generation wireless communications will integrate multiple wireless access networks. Global information access to the user will be provided by the wireless networking. Now-a-days, wireless networking is becoming an important and popular way to provide the global information access to the user while roaming among the heterogeneous wireless network. Everyone wants the quality of services anywhere and anytime. There is high probability that signal coverage of these coexisting networks overlaps with each other. For a user roaming among these networks, it is desirable that the user's mobile device can have anytime connectivity, and therefore vertical handoff becomes an important issue.