Research And Analysis On Mobility Management In IP Networks

Two major technological forces are driving the evolution of telecommunications: the wireless cellular systems and the Internet. As these forces converge, the demand for new services, increasing bandwidth and ubiquitous connectivity continuously grows. It can be sure that the next-generation mobile systems will be based solely on IP protocol.However, in original network, network devices are considered to be static and all protocols are designed based on this. Therefore, mobile environment brings some new challenges to traditional IP protocol along with opportunities. These challenges include:(1) How to change their point of attachment to the Internet without changing their IP address(2) How to ensure security of Mobile Node(3) How to cope with low reliability and bandwidth of wireless network(4) How to deal with handover(5) How to provide QoS to Mobile Node(6) How to be compatible with current protocolTo these challenges, many resolutions are proposed, in which Mobile IP is the most famous one. Introducing the concept of mobility agent, Mobile IP copes with the problem efficiently. However, Mobile IP still has faults. As research goes on, micro-mobility protocols, such as cellular IP, are designed. But these protocols still have their own shortcomings. To resolve these shortcomings, this paper presents 3 modifications to current protocol as follows:(1) To resolve the problem of HAWAII, we propose a new path setup scheme based on default route. Taking into account different network environments, this scheme uses default route in path setup procedure. The simulation and calculation show that this scheme achieves more flexibility and decreases the routing table overhead while keeping similar performance.(2) To resolve the problem of MAP selection in HMIPv6, we propose an adaptive MAP selection scheme that support load sharing. The simulation and calculation show that this scheme achieves good effect in overhead management and load sharing while be easy to implement. Besides that, we also introduce fast handovers to HMIPv6. By evaluation, we confirm that F-HMIPv6 can gain the benefit of HMIPv6's reduced signaling and registration times as well as shorter rendezvous time that FMIP buys.(3) To resolve the problem of routing protocol of MANET, we propose a multi-path QoS Routing protocol based on different path selection Strategies for mobile ad hoc networks. According to different multi-path selection strategies, three sub-protocols have been designed. We evaluate the performance of the QoS routing protocol using extensive simulation.