In order to improve the handover performance and reduce the delay of handover, the paper has made the following tasks:1. we have analyzed deeply to process of the mobile IPv6 protocol handover, and point out the delay which the various steps have brought;2. We have analyzed handover process of the Mobile IPv6 protocol and improved protocol (such as HMIPv6 lace wedding dresses protocol, FMIPv6 Protocol), and pointed out that the design ideas, the improve methods and the problems for these protocol. We have analyzed deeply for direction of improved the handover delay;3. Based on the analysis and summing up, we have proposed the scheme named handover in hierarchical mobile IPv6 Based on the Fast DAD mechanism in visual domain. By introducing the 12hot cheap prom dresses concept of virtual domain based on HMIPv6, we defined MAP and neighbor MAP which were defined in HMIPv6 protocol in the same domain, and make servers in visual domain which ware defined in this paper replace mobile node to do DAD operations in handover process. When the mobile node new shoes 2010 moved in the network, there is no need to duplicate address detection, as moved in the same domain. The scheme have solved problem which needs to passive waiting in the traditional duplicate blog wedding dresses 2010 addresses detection, this is the innovation in this paper;4. In the means of experiment, NS2 simulation wedding dresses form china platform was used in this paper. NS2 is an open source, free simulation platform. Researchers can easily use it for network protocol development, and the modules are rich, almost involved in all network technology.
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