Abstract: IPv4-based networks are faced with many problems like the lack of IP address, less security, and so on, which have limited the development of Internet, therefore, it is important to study the techniques of IPv6, so as to promote the construction of the next generation of Internet. The problems of handover latency and lost packets of mobile IPv6 were discussed, in which, the three extension techniques in current mobile IPv6 protocols, namely as fast handover, smooth handover and hierarchical mobile IPv6, were firstly analyzed. And then, based on the IETF drafts, a framework with smooth handover technique was brought forward. In this framework, the handover process and the buffer management worked at different levels respectively, which would improve the expansion and portability of the application systems. This framework would be viewed as an effective method to transport reliably the real-time information of the application systems working in mobile IPv6 environment.