基于MPLS的移动IPv6网络的无缝切换方案

Seamless Handoff Scheme in MPLS-Based Mobile IPv6 Network

在集成了多协议标签交换的移动IPv6网络中设计了一种无缝切换方案,它通过限制标签交换路径(LSP)的重建范围和在切换时对主机双播数据来实现低时延和低分组丢失率的切换,并提出了一种快速查找主机切换前后发送分组历经路径的最近公共点的算法,实现了LSP重建时延和双播冗余的最小化.此外,使用层次移动IPv6和2层触发信息来减少注册时延和路由器搜索时延,进一步加速了切换.理论和仿真分析表明,所提方案的切换时延小于现有方案的时延,它能更好地支持主机的高速移动.

A novel scheme of seamless handoff in MPLS-based mobile IPv6 network is proposed, which shortens the handoff latency by confining the re-establishment range of the label switching path (LSP) and decreases the packet loss rate by bicasting data to the mobile host during its switching. An algorithm for quickly finding the lowest common point of two paths through which mobile host (MH) sends packets before and after switching is presented to minimize LSP re-establishment latency and bicasting redundancy. In addition, the hierarchical mobile IPv6 and two layer's trigger information are utilized in the scheme to shorten the delay time of registration and router discovery, which further speeds up the switching. Both simulation and theoretic analyses show that the handoff latency in the proposed scheme is shorter than that in the existing scheme, and our scheme is a good solution for highly mobile users.