一种基于动态分级网关代理的移动IP缓存方案

研究移动IP下平滑切换的缓存方案.首先提出了一种动态分级的网关代理的模型,分析了在这个模型下的缓存过程,研究了缓存区的分配与管理,并进行了仿真测试.理论和仿真分析表明,将缓存分为网关代理和局部代理两级,局部代理动态形成,使缓存任务得以分散.采用的单缓存十字链表的缓存结构,及相应的释放和大小设置策略,有效地解决了移动节点切换丢失数据和TCP性能下降及数据乱序问题.为更好地研究移动IP平滑切换问题提供了基础.

A Mobile IP Buffer Scheme Based on Dynamical Hierarchical Gateway Agent

Discusses the buffer scheme in the process of smooth handoff in mobile IP.A dynamical model of hierarchical gateway agent is proposed to analyze the buffer process,as well as the distribution and management of buffer area.A simulating test is thus carried out.The result and theoretical analysis reveal that dividing the buffer area into two levels,i.e.,gateway agent area and local agent area which forms dynamically,will decentralize the buffer mission.Then,introduces a single buffer in combination with cross link list and corresponding strategy for release and proper setup into the scheme to solve effectively such problems as data loss when handing off mobile nodes,TCP performance degradation and disorderly data.The scheme also provides a foundation on which the smooth handoff in mobile IP can further be investigated.