A SIMPLE AND SEAMLESS VERTICAL HAN DOFF PROTOCOL TO ENHANCE THE PERFORMANCE OF DATA SERVICES IN INTEGRATED UMTS/WLAN NETWORK

The Next Generation Wireless Network (NGWN) is speculated to be a unified
network composed of several existing wireless access networks such as Wireless
Local Area Network (WLAN). Global System for Mobile (GSM). Universal Mobile
Telecommunications System (UMTS). Worldwide lnteroperability for Microwave
Access (WiMAX). and satellite network etc. The NGWN will permit the wireless
client to roam across diverse integrated access networks while maintaining the session
continuity. In order to maintain the session continuity in such an internetworking
environment, the most important and challenging issue is to attain the seamless
mobility. The literature demonstrated that when the wireless client switches the active
data session between the heterogeneous wireless access networks, the loose coupling
based mobility management techniques lack in providing the seamless mobility.