Algorithm for Vertical Handover using Network Fitness Function

There has been deployment of Heterogeneous Wireless Networks (HWNs) across the world. As a result, a roaming mobile user encounters networks with various Radio Access Technologies (RATs). For reliable connectivity and best user experience, the issue is to identify and execute the handover to the best network among the available candidate networks. This problem can be solved by efficient Vertical Handover (VHO) algorithms. In this research paper, we present Vertical Handover Decision Algorithm (VHDA) based on Network Fitness Function. The input parameters considered in VHDA are Received Signal Strength (RSS), bandwidth, cost and user velocity. Network Fitness Function of available candidate networks has been calculated using the parameters and decision for handover is made basis the highest score.