Abstract: Many of current Micro-mobility Management schemes adopt the hierarchical principle，deploying a Foreign Management Agent（FMA） as regional agent outside the sub-region.Mobile HOST（MH） only need to register at FMAs when moving，which is transparent to Home Agent（HA）.In order to fix the defect of FMA’s overload causing by too many MHs，a Load-Balancing Distributed Dynamic Micro-mobility Management scheme is put forward.In this scheme，several regional mobile agents are put into the network，in order to realize the Distributed Intra-Domain Host Management.Moreover，an arithmetic which dynamically selects regional mobile agents according to network’s load is put forward and it avoids the problem of FMA’s overload when there are too many MHs in the traditional protocol effectively，without any compulsory requirements for network topology structure and the location of regional mobile agents.Analysis and emulation show that the condition of load balancing is improved when the amount of hosts increases quickly.

Key words: cost function, regional mobility Agent, the balance of network load, micro-mobility management

摘要： 目前微移动管理方案大多是采用分层的原则，在子域外设置一个外地管理代理（FMA）作为区域代理。移动主机（MH）在域内进行移动时只需向FMA进行注册，而对家乡代理（HA）透明。为了弥补MH数量过多而导致的FMA负载过大的缺陷，提出了一种平衡负载的分布式动态型微移动管理方案。该方案在网络中放置多个区域移动代理来实现分布式的域内主机移动管理，并采用一种由网络根据自身的负载情况动态地选择区域移动代理的算法。该算法有效避免了传统方案中FMA在MH数量过多时负载过大的问题，且没有对网络拓扑结构和区域移动代理的位置做任何强制性要求。分析和仿真均表明，当主机数量快速递增时网络的负载平衡状况得到了改善。

关键词: 代价函数, 区域移动代理, 网络负载平衡, 微移动管理方案