Vertical Handoff Decision Model for Next Generation Network Based on Cost Function

The next generation Wireless network (NGWNs) allows the mobile node to access in different wireless network for a high rate of services. Therefore, In future there will be a need to have decision algorithm to decide, which is the best network for a specific application that the user needs . In this paper we propose a vertical handoff decision algorithm to decide the “best network” interface and “best time” moment to handoff. In this a score function is calculated based on static factors (e.g. Band width , power consumption ,link cost) and dynamic factor (e.g. Congestion , received signal strength, MT velocity, duration of a mobile node in a particular network)to make the vertical handoff decision. This model increases the user level of satisfaction based on cost function and also improve the whole system performance by reducing the unnecessary handoffs. KeywordsVertical Handoff Decision(VHD),Next Generation Wireless Networks(NGWNs), Horizontal Handoff (HHO),Vertical Handoff (VHO).