The Research On Mobility Management Of Next Generation All-IP Wireless Networks

Recently, 3G mobile communication system and LTE evolve gradually to all-IP architecture in order to adapt the requirements of mobile wireless Internet. At the same time, in the field of broadband wireless access technology, 802.16, attracts more and more attentions from communication manufactures and mobile service provider. The growing density of subscribers and the need for handoff and roaming freely underscore the importance of mobility management. Therefore, mobility management of All-IP wireless networks is becoming more and more important.There exist some problems in mobility management based on Mobile IP in all-IP wireless networks. This thesis focuses on the research of several mobility management protocols including FMIPv6, HMIPv6, NetLMM, PMIPv6 and mobility management of Adhoc networks. The main contributions of this thesis include:Firstly, we introduce the good facter of MIP, then analyse the fast handover management protocol FMIPv6 and the micro-mobility management protocols. HMIPv6 protocol can reduce handover latency by reduce the number of binding update and signal transmission time. Therefore it can't reduce the latency of mobililty detection and address configuration. In order to get better handover performance, the paper proposes a route optimized method of micro-mobility management, Enhance-Micro-HMIP. The simulation experiment based on NS tools can prove our proposal.Secondly, we analyse the significant problems in hierarchical mobile IPv6 (HMIPv6) occur due to its inability to availably support macro-mobility because of long delay and high packet loss during handover. Then a new macro-mobility management handover mechanism, Enhance-Macro-HMIP for macro-mobility management is proposed. Numerical and simulation analysis are carried out to evaluate the performance of the protocol. The performance evaluation results display that the method can largely reduce the handover latency and the packet loss in contrast with HMIPv6 macro-mobility protocol.Thirdly, we introduce the existing terminal-based global mobility management protocols that are not suitable for the future mobility management, which requires low handover latency, low-complexity and manageability. Focus on the requirement of local small range mobility, a new fast network-based localized intra-domain mobility management scheme, F-PMIPv6, is proposed. In contrast with PMIPv6 protocol, the performace analysis result indicates the improvement of handoff lantency and location update cost.Fourthly, we analyse the research margin in inter-mobility handover management of PMIPv6, and propose an inter-mobility handover management solution based on PMIPv6 protocol. Our proposal is the first work to solve the macro-mobility problem of PMIPv6. The solution analyses the three basic network frames, which are determined by the network location of the CN (Correspondent Node). Then focus on the three network frames, we adopt the methods of PMIPv6 route optimization and design the inter-domain handover management solutions respectively. In contrast with HMIPv6 inter-domain mobiity management method, the proposal can improve the performace in location update cost, packet delivery cost and total cost.Fifthly, we introduce the problems of mobility management in hybrid networks integrated by the Adhoc and IPv6 networks. Then a neighbor-assisted agent fast hierarchical smooth handover mechanism, called BFH-NAA, is proposed. The proposal takes advantages of NAA protocol and sets packet buffer in the previous access point. Meanwhile the mechanism adopts the method of hierarchical and fast handover to carry out smooth handover. By this proposal, before the accomplishment of the binding update between NAA (neighbor-assisted agent) and CN, the mobile node can receive the buffered packet from the previous access point via the new access point and the NAA. Performace analysis results show that the proposal mechanism can provide better performance than MIPv6 and NAA protocols.