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Mobile IPv6 provides IPv6 nodes with the ability to use home address to keep the connection while roaming between different subnet. The handover performance of mobile IPv6 is one of the key factors which guarantee the QoS of mobile Internet. In this paper, we propose an enhanced handover scheme in a heterogeneous mobile environment with the support of the Media Independent Handover (MIH)Services and Advance Duplicate Address Detection (A-DAD).The proposed scheme can reduce the handover latency in Mobile IPv6 greatly. We perform a simulation on handover between WiMAX and WLAN IEEE 802.11b with the proposed scheme in Mobile IPv6 to get handover performance in terms of handover latency.