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Major research challenges in the next generation of wireless networks include the provisioning of fast vertical handoff across heterogeneous network and the improvement of end-to-end quality of service (QoS). There are two major issues which how to reduce handoff latency and packet loss rate during UMTS/WLAN handoff. In this paper, we introduce a cross-layer mobility management solution which was called a CLAMP (Cross-layer Multi-Path) scheme with the mobile Stream Control Trans-mission Protocol (mSCTP). Our fast vertical handoff approach uses the concept of relay in cooperative technique that get handoff information in anticipation to speed up the net-work layer movement detection process and the multi-homing features of SCTP so that a mobile device can have multiple IP addresses during the vertical handoff. Further, this paper compares all kinds of variants schemes and analyzes these handoff mechanisms in detail. Finally, the simulation results are presented to demonstrate the effectiveness of the proposed scheme.