Research Of An Optimized Realtime Handover Technology And Fault Tolerance Mechanism In Mobile IPv6

As the mobile computing devices and wireless sensors appeared in large numbers, network will become the interface for people communicating with the surrounding physical world. With the development of Internet and mobile communication technology, mobility support for hosts connecting to the Internet is provided in mobile IPv6, addressable problems of the mobile terminal are solved, and the network services can be obtained by mobile terminals without changing IP addresses. But substantial network expenses and lengthy handoff delay can be introduced by MIPv6 during the mobile handover process, meanwhile, a packet lossless QoS guarantee during a handoff is required by more and more delay sensitive real-time applications. Besides, home agent device is introduced into the mobile IPv6 network architecture in order to support mobile node's mobility. Home agent is managed by the architecture in a centralized or semi-centralized way mostly at present, this will lead to single-point failure and performance bottleneck, meanwhile, the support of fault tolerance mechanism is lacked and load balance problem will be encountered.The mobile node will become unaddressable once the home agent fails.To solve the above problems, an improved seamless handover mechanism on the basis of existing handoff methods is proposed in this paper, it builds on top of the hierarchical method and the fast handoff mechanism and adopts a Decision Engine-based dynamic distributed architecture, meanwhile, a dynamic fault tolerance scheme based on active detection and over-load prevention is proposed in this paper, and intelligent balancer is introduced to support load balance. At last we demonstrate this new scheme can reduce packet loss and handoff delay efficiently, improve handoff efficiency, reduce registration time, enhance reliability of the mobile IPv6 network by theoretical analysis and experiments.