Abstract: Mobile IP (MIP) enables a mobile node (MN) to continuously access the Internet without changing its IP address. The main shortcoming of MIP is that the MN needs to perform binding-update frequently during the movement of the MN, which results in much signaling overhead. To reduce the signaling overhead, internet engineering task force (IETF) presents hierarchical mobile IPv6 (HMIPv6) protocol. Based on HMIPv6, an adaptive hierarchical mobility management scheme is proposed, in which a mobility anchor point (MAP) is chosen dynamically and the number of the access routers (ARs) included in a MAP domain is also adjusted dynamically. Simulation results indicate that the proposed scheme outperforms those in which the number of the ARs in a MAP is fixed.

Key words: mobile IP (MIP), mobility management, fuzzy control

摘要： 移动IP(mobile IP, MIP)使主机在移动过程中不需改变IP地址便可连续访问Internet, 其主要缺点是主机在移动过程中需要频繁地进行绑定更新, 产生的信令开销较大。为降低移动IPv6的信令开销, IETF (internet engineering task force)提出了分层移动IPv6(HMIPv6, hierarchical mobile IPv6)协议。基于HMIPv6, 提出了一种自适应的分层移动性管理方案。这种方案采用模糊逻辑, 根据移动主机的移动次数及移动性管理代价, 动态选取MAP(mobility anchor point)并调整MAP区域所管辖的接入路由器个数。仿真分析表明, 所提出的方案的代价优于固定MAP区域的移动性管理方案。

关键词: 移动IP, 移动性管理, 模糊控制