International Journal of Advanced Research in Computer and Communication Engineering (IJARCCE)
For high bandwidth data application and services, present 3G network is not ideal as the data rate is low (2MBPS) and its high cost restrict the high bandwidth application. To above restriction development of good heterogeneous network is on high demand, which not only provide high data rate but also low cost. To facilitate end user with high bandwidth data services different architectures has been proposed. Previous studies shows loose coupling has worst performance i.e. connecting WLAN to IP backbone directly. For high bandwidth application tight coupling integration of UMTS-WLAN is the efficient way, there are two way to form tight coupling i.e. connecting WLAN with either SGSN or GGSN.