Research On Handoff And Mobility Management In Mobile IP Network

MIP was originally designed by IETF to serve the needs of globally mobile users who wish to connect their MNs to the Internet and maintain connectivity as they move from one place to another, establish new links, and move away from previously established links. However, communication quality of MIP degrades because of its high signaling overhead and its long handover delay.At first, the thesis gives an introduction of the basic Mobile IP protocol that IETF suggested. Then we study several key techniques of MIP, including mobility management of MIPv4 and MIPv6, low latency handoff process in this paper. The main research work and conclusions are as follows:1. One of the major problems for the Mobile IP is frequent location update and high signaling overhead. To solve this problem, a regional registration was proposed to employ the hierarchy of the foreign agents (FAs) and the gateway foreign agents (GFAs) to localize registration operation. The system performance is largely dominated by the ability of a GFA and its reliability. In this paper, we propose a new location management scheme for Mobile IP that reduces signaling burdens configuring regional network dynamically according to the characteristics of users and network. Simulation demonstrates that the proposed scheme performs better than other schemes when compared the total signaling cost and the regional network size.2. Based on the analysis of inter-domain registration cost of the mobile node in "Hierarchical Mobile IPv6" (HMIPv6), we proposed an optimized selection algorithm. To make good use of the capability of higher MAP, a dynamic adjustment mechanism for the algorithm was introduced. Theoretical analysis and simulation results showed that the inter-domain registration cost of this algorithm was lower than the traditional mobility based MAP selection algorithm and dynamic adjustment mechanism improves the performance further.3. We present an improvement over the Pre-Registration low latency handoff proposed by the IETF. By applying a control message, the actual handoff latency and buffering requirements decrease. After describing the protocol, we present an analytical model that provides us with results on packet delay and buffering requirements for a CBR packet stream.