Abstract
Mobile IPv6 (MIPv6) describes how mobile node can change its point of attachment from one access router to another. The handover performance of mobile IPv6 is one of the key factors which guarantee the QoS of mobile Internet. In Hierarchical Mobile IPv6 (HMIPv6), mobile node’s handoff performance is very much impaired by the Duplicate Address Detection (DAD) procedure for the newly formed Care-of Address. In this paper, an enhance handover scheme in hierarchical MIPv6 networks by utilizing Passive Duplicate Address Detection (PDAD) to identify duplicate addresses is proposed. Using PDAD, a node examines incoming routing protocol packets to develop hints about address controversies. Since it is independent of the routing protocol, it produces nearly no protocol overhead and reduces initial delay. The simulation of the proposed scheme was carried out by using the Network Simulator-2. The simulation results show that the handoff delay and packet loss are reduced in case of PDAD based handoff, when compared with the standard DAD based handoff.
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