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HMIPv6考虑了CN和MN在同一条链路上的情况,报文可以直接传送而不经过MAP,但没有考虑到CN和MN在同一个域而不是同一条链路上的情况,而此时两者之间的通信不是优化的路由。可将MN的LCoA传送给CN,来实现CN和MN之间直接通信,达到路由优化目的。而MN频繁切换时,又增加了BU开销,因此,切换频率和数据报送频率是路由优化要考虑的两个重要因素。在阐述HMIPv6基本工作原理,分析其路由情况的基础上,讨论了HMIPv6全局的和局部的路由优化方案,提出一种自适应的路由优化方案。
HMIPv6 considers the situation that CN and MN are on the same link. The message can be directly transmitted without passing through the MAP, but the situation that CN and MN are in the same domain instead of the same link is taken into account. In this case, Communication between people is not optimized for routing. The LCoA of the MN can be transmitted to the CN to achieve direct communication between the CN and the MN so as to achieve the purpose of route optimization. However, when the MN switches frequently, the BU overhead increases again. Therefore, the switching frequency and the data reporting frequency are two important factors to be considered in the route optimization. After elaborating the basic working principle of HMIPv6 and analyzing its routing situation, the global and local routing optimization scheme of HMIPv6 is discussed and an adaptive routing optimization scheme is proposed.