基于多层小区结构的移动IP移动性管理

1.引言为了支持全球的IP网络互通和设备的漫游,IETF提出了IP移动性支持协议——移动IP。其中规定:只要MN移动到另外一个IP子网,它就会获得另外的转交地址,从而启动注册过程,该过程要求MN必须通过FA向HA进行注册,MN的任何移动都必须报告给HA,由HA来维护MN的移动绑定。这种简单的移动性支持方案可以与现有网络兼容,并且只需要在移动代理(包括HA、FA)和MN上根据终端的移动性要求进行改进即可实现移动IP功能。当应用于“宏移动”(macro mobility)时,这是必要的和充分的,而当应用于“微移动”(micro mobility)和“快速移动”(high mobility)的环境时,则存在许多不足,突出表现在以下三点:1.在网络中将引发大量的注册报文的传输从而严重影响网络性能;2.造成较大的

Mobility Management of Mobile IP Based on Multi-tier Cellular Systems

In this paper, several currently existed Mobility Management Schemes of Mobile IP are simply analyzed, and so does the network structure of multi.tier cellular which nowadays is easily seen. Then we propose a few promotions on the strategies of mobility management when realizing mobile IP in multi.tier cellular network structure. The key of the promotions is that the required type of cell for a MN is determined based on the classification of its mobility pattern. Consequently,the capacity of system may be increased while the frequency of handoff is decreased.