Seamless Vertical Handoff between WLAN and WiMAX?

The next generation of wireless communication systems is expected to include heterogeneous broadband wireless networks that will coexist and use a common IP core to offer a diverse range of high data rate multimedia services to end users with contemporary mobile devices that are equipped with multiple network interfaces. This requires the provision of seamless vertical handoff. So, in this research work we have considered heterogeneous network which consists of two sub networks (WLAN and WiMAX) to analyse vertical handoff and have discussed an approach to improve service quality in network. We have used ASN (Access Service Network) anchored mobility For performance evaluation VoIP application is chosen For improving QOS we have introduced QOS configuration Profile in the network whose different profiles such as RSVP, PQ, RED are set and have been added at the interface of ASN gateway which resulted in the improvement over the existing handoff techniques in terms of values we get for different performance parameters.