The Research And Implementation Of Mobile IP Adapting Predictive Handoff

In recent years, the applications of remote office and mobile computing keep increasing. In wireless environment, The Mobile Host must perform handoff to keep the connections when it moves between different sub networks. The handoff has been the key factor of the wirless system and the studies on the Mobile IP handoff has become one of the important researching fields of the computer wireless network.Firstly, the paper make analysis in depth of the Mobile IP handoff scheme, the motion detection scheme as well as its different methods adopted. The interaction processes of receiving and affording the register messages between the host and the agents are explained in detail. Meanwhile the Mobile IPv6 architectrue and it's handoff scheme are discussed and the existing problems are exposed. The paper classifies various fast handoff shcemes into hierarchical mobility management scheme, Celluar IP and HAWAII,, the handoff scheme combined with information of data link layer etc, according to comprehensive analysision and evaluation. In the way of smooth handoff, two systems of unicast forwarding and multicast forwarding which are widely used as packets cache and forwarding schemes of handoff are discussed. Based on the theory that mobile IPv4 of hierarchical mobility management mapped onto the Mobile IPv6 architecture, two improving schemes of hierarchical Mobile IPv6 and Regional Mobile IPv6 are presented.The handoff latency is the main section of the latency of the motion detection, which is caused by the fact that the host has to passively perform the motion detection. The paper presents and accomplishes the AIPNU.MIP (Adaptive Initiative Predictive Neighbor unicast Mobile IP). It adopts the adaptive initiative predictive algorism, intellectively predicts according to the network conditions and the movement of the Mobile Host, and adjusts itself corresponding to feedbacks. The special situation of PingPang (Table-tennis) effect is also fully considered. Besides, Combined with the hierarchical mobility management scheme, AIPNU.MIP also reduces the latency of registration and by adopting the predictive neighbor unicast, a fast and smooth handoff is achieved.Eventually, the paper demonstrates a contrast experiment in terms of emulating standard Mobile IP hierarchical mobility management MIP and AIPNU.MIP in the network testing conditions established on the Linux + NS simulation platform. Theresults indicate that contrasting with the standard Mobile IP and hierarchical mobility management MIP, AIPNU.MIP reduces the handoff latency and the counters of handoff greatly, guarantees the packet's arriving in time, increases the handoff performance of the system, and maintains a better QoS.