AN INTEGRATED WLAN AND WiMAX ARCHITECTURE WITH QoS-BASED VERTICAL HANDOFF SCHEME

Abstract

The evolution of today’s wireless network lean to combine different wireless access technologies for the purpose of offering users the Always Best Connected(ABC) service. The devices have multiple heterogeneous interfaces to offer services from different networks simultaneously. It is an important and demanding issue to support seamless handover in this integrated architecture. Handover refers to the process of transferring an ongoing call or data session from one channel connected to the core network to another. The process of handovers requires a number of parameters e.g. what is the handover scheme we are using, how many channels are free. The handover process should also keep the QoS up to the standard. Here, the issue of vertical handovers in heterogeneous wireless networks is investigated. Integrated WLAN and WiMAX architecture with QoS-Based vertical handoff scheme is proposed to provide seamless handoff. The article investigate a simple and efficient method to calculate the available bandwidth in WLAN and WiMAX networks to evaluate the real-time status of the overlay networks and make a handoff decision based on the information. Power consumption module is proposed to calculate remaining power of the neighbouring node as if it is above threshold we will get best connected service. This application will initiate a handoff only when it satisfied the QoS parameters that is available bandwidth and power. The simulation study has revealed that the proposed scheme can keep stations always best connected with their QoS requirements.