摘要
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移动性支持的规范--移动IP[1].该规范在移动IP网络结构中定义了三种功能实体(如图1):移动节点(MH)、归属代理(HA)和外地代理(FA).每一个MH在归属网络获得一个永久的IP地址(home address),称为归属地址,当MH离开归属网络后,进入外地网络,将获得一个转交地址(care-of address),该IP地址可以是MH注册的FA的一个IP地址,也可以是外地网络临时分配给MH的IP地址.MH的HA维护MH的归属地址和转交地址之间的移动性绑定,所有发送到MH的IP包都通过常规的IP路由方式传递到HA,HA再通过隧道方式发送到MH的转交地址.
The IETF Mobile IP standard is intended to solve the general problem of host mobility in the global Internet. When mobile devices crossing cell boundaries frequently (micro mobility), the standard mobility management scheme of mobile IP will result in frequent location updates and degradation of network performance, the latency involved in the re-routing of the packets ,and the loss of packets. Therefore the standard mobility management scheme of mobile IP must be improved to adaptive this situation, i.e. micro mobility. In this paper three typical improved registration schemes are introduced and deeply analyzed and it will be helpful for the further solution of this problem.
出处
《计算机科学》
CSCD
北大核心
2002年第8期30-32,29,共4页
Computer Science
基金
重庆科委基金
关键词
移动IP
移动性管理
组播
移动通信
Mobile IP, Mobility management .Hierarchical model, Multicast of DFA routing agent
