Research Based On Switch Of Fast-handover Hierarchical MIPv6

Move IPv6, as an important part of next generation Internet constructing, providing users with a powerful mobile communications support, has become a hot research of network. With mobile phones, laptops and other portable mobile communication terminal equipment widely used, people's requirements of Mobile-IPv6's performance are increasingly high. However due to the Protocol itself, mobile node's switching between different networks will have a longer period of time of switching delay and packets loss, which interrupting of ongoing data communications between both sides. Then reducing the switching delay to ensure ongoing network traffic performance after switching has became a focus of research of IPv6.This article committed to the study of Mobile IPv6 handover performance. This article first analysis of the standard MIPv6 protocol and its several improvements program, such as Fast Handover MIPv6, Hierarchical MIPv6, Fast-Handover Hierarchical MIPv6, and compare their switching performance. Then study the IPv6 multicasting technology, in-depth understanding of the multicasting protocol and multicasting network construction process, and on this basis, with actual network deployment topology proposes a improved program of F-HMIPv6, MF-HMIPv6, based on multicast mechanism. The main idea of this improved program is before the move node moving into the new access subnet, predicting the trigger handover by the L2 link layer information, so start F-HMIPv6 handover operation, switching to the multicast mode, using multicast protocol MLD and PIM to create a multicast group, taking MN as the recipient, PAR and NAR as forward routers and the MAP witch on both PAR's routing and NAR's routing as the multicast source, until all handover operations completed.Take a theoretical analysis of handover performance. This improved program avoids the Duplicate Address Detection and other signaling interaction process by creating a multicast group to forwarding the data of both sides of communication, effectively reducing the handover delay in the original technology. Following, further demonstrate the improvement in handover latency, smoothing and other performance of the improved program MF-HMIPv6 by simulation on NS-2.