Broadly accepted WLAN technology and the UMTS system are two most important wireless networks in the future. A lot of interests have been put in integrating these networks in order to get the benefit of both high data rate of WLAN and wide coverage area of cellular networks, and supporting end to end Quality of Service (QoS) is an unavoidable topic towards such a goal. Looking at the collective advantage of both heterogeneous networks is the inspiring feature of UMTS/WLAN integration. This paper proposes different solutions for UMTS/WLAN integration and vertical handover problems. The solution is based on an implementation of two coupling schemes that are later enhanced to support handover solutions. The work involves network simulation and comparative analysis for the proposed solutions, as well

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