The Research On Key Technologies Of Network Mobility Management

Network mobility management is a major part in wireless communication technology and becomes a hot topic in research and industry application in recent years. The key technologies involved in this subject include: location management, handoff management, route optimization, security, co-operation and so on.This thesis systematically summarizes the latest achievements in the research of network mobility management technologies and majors in route optimization, handoff management and multihoming for mobile networks. The main research contents and outputs are as follows:After analyses of proposed route optimization solution for mobile networks, a new taxonomy is presented based on the implementation phases the route optimization solution focused on, and also the main problems existed in proposed solutions are introduced.Access point selection solution is proposed to solve the degradation of network performance caused by access to improper router. By extending prefix information option to attach link performace parameters, mobile routers can get enough information about candidate access routers in reachiable before really attach to foreign network and choose access point according to its own strategy, then unnecessary handoff can be avoided.New route optimization solution called ROPIO is proposed to solve suboptimal routing problem caused by nested mobile networks. By configuring addresses of mobile nodes with sub-network prefix in root mobile network, and using root mobile router's care-of address as their own addresses to register on home agents, route optimization can be achieved not only in communication between node inside nested mobile networks and node outside, but also in communication between nodes both inside mobile networks. The analysis and simulation results have shown that ROPIO can improve routing performance of nested mobile networks in that it can shorten data path, decrease handoff lantency and reduce additional cost.The paper focuses on release the impact caused by dynamically changed topology of whole nested mobile networks and proposed solution based on localized mobility management, LRO. By transferring mobility management function from root mobile router to local mobility anchor, multiple registrations are restricted in certain domain. If the handoff occurres in same local mobility domain after the topology of whole nested mobile networks is changed, no registration to home agent is needed. Then routing can be optimized and traffic in bone networks can be reduced. The analysis and simulation results can show that LRO can reduce additional cost and improve throughput effectively. Based on LRO, multihoming-LRO is proposed to support route optimization and fast handoff for mobile network with multiple interfaces on mobile router. By defining threshold in advance and monitoring link performance, when primary link is not good enough, mobile router can establish secondly link as soon as possible. Then handoff latency can be shortened and data loss can be reduced. Moreover, mobile router can choose to connect to foreign network through multiple interfaces to distribute traffic and improve throughput.A novel mobility management scheme is proposed based on backup registration for mobile networks with multiple mobile routers and multiple home agents after analysis of multihoming technology. Introducing backup registration, datum can be transmitted through multiple pathes, even if mobile router has only one interface, it can deliver packets through backup link. When link performance is degraded, backup register can be initiated to shorten communication interruption caused by link broken. Mobility management can be provided to multihoming mobile networks and not only the robustness but also the capability of self-recovery can be improved.