Hierarchical Mobile Ipv6-regional Organizations

With the increasing number of wireless devices in use, such as PDAs,laptops and cellular phones, more and more Internet services will be accessibleby moving users through wireless networks. Mobile IP is the most promisingsolution for the mobility management of the Internet. But the standard mobileIP protocol is not designed for environment where mobile nodes change theirpoint of attachment to network so frequently, so we need "micro mobility"protocols to solve the problem. HMIPv6, as an extension to Mobile IPv6, isjust a "micro mobility"protocol, which is also the topic of the dissertation.Firstly, the principle of mobile IP is presented. The concepts and maincomponents of HMIPv6 are analyzed. MAP selection strategies and domainorganization schemes, which will affect signaling load and handoff rate greatly,are discussed in depth. Then HMIPv6 and other two micro mobility protocolsare compared in details.Secondly, the dissertation probes into the wireless module Mobiwan,which has implemented some important mobile IPv6 features. Thencompleting code of HMIPv6 based on it.Eventually, for farther reducing the signaling cost of HA and alleviatingthe load of backbone networks, the dissertation introduces the principle andoperations of border access router, analyzes two new domain organizationschemes. One scheme is to change border access router's attributive MAPaccording to the handoff statistics, the other is to send local binding update toformer MAP when mobile node attaching to the border access router. Thesimulation results show that the second scheme has mitigated the signalingload of HA remarkably and can be an effective extension to the standardHMIPv6.