利用随机游动模型分析分层移动IP的代价

介绍了分层移动IP（因特网协议）、动态分布式分层移动IP和链状外地代理的分层移动IP 3种旨在通过注册的本地化提高移动IP切换性能的分层移动IP解决方案，提出了一种基于移动主机在一维直线上的随机游动建立的代价分析模型，比较了这3种方案在信令传输、数据包转发方面的代价，考察了不同的切换门限值对代价的影响. 数值结果表明，链状外地代理的分层移动IP方案适用于家乡切换门限值较小时的移动场景.

A Random Walk Model to Analyze the Costs of Hierarchical Mobile IP

Three hierarchical mobile IP(Internet protocol) schemes to improve the handoff performance of mobile IP,i.e.hierarchical mobile IP,distributed and dynamic hierarchical mobile IP and chained foreign agent hierarchical mobile IP were introduced.An analysis model based on one-dimensional random walk model was also proposed to derive the signaling transmission cost,the packet deli-(very) cost and the total handoff cost of the three schemes.The performances of the three schemes were compared in detail based on the model,and the effects of different home handoff thresholds on the costs were discussed.Numerical results show that the chained foreign agent hierarchical mobile IP scheme outperforms the other two under small home handoff threshold.