In the fast changing field of wireless communication new technologies emerges regularly to satisfy the ongoing demand for faster data rates and larger coverage area. Therefore it is important for the user to make the best possible use of the available heterogeneous network for connection support. For movement of mobile between heterogeneous networks vertical handoff is necessary. IP Multimedia Subsystem is an emerging architecture framework for interworking heterogeneous networks. In this paper we used WLAN/WiMAX heterogeneous networks and three coupling architectures such as tight coupling, loose coupling and hybrid coupling are considered. The parameters such as vertical handoff delay, Mobile scanning interval activity, neighbouring advertisement received are obtained. From the simulation it is inferred that tight coupling is performing better from handover point of view.
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