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针对移动节点MN在代理移动MIPv6的切换过程中,本地移动锚点(LMG,Local Mobility Anchor)和移动接入网关(MAG,Mobile Access Gateway)在完成代理绑定更新以后,MN尚未配置好有效的地址,从而会引起严重的切换延时和数据包丢失的问题,提出了一种改进算法--基于LMA缓存的路由优化方案。在标准PMIPv6协议中,链路中断过程中的数据包在MAGs中建立缓存,然后在MAGs之间建立双向通路并通过双向通路发送数据包。改进算法在LMA中加入缓存队列用以缓存链路中断时的数据包,然后等到链路畅通后再向MN发送缓存的数据包。这样不仅减少了MAGs之间的信令交互,而且省去了在MAGs之间建立双向通路的时间,提高了切换效率。仿真实验结果表明,新方案在减少切换过程中的丢包和信令交互方面有了很大的改进。
In the process of the proxy MN MIPv6 being handed over, the MN and the MAG (Mobile Access Gateway), after completing proxy binding update, have not configured a valid MN Address, which will cause serious switching delay and packet loss problem, an improved algorithm - LMA cache based routing optimization scheme. In the standard PMIPv6 protocol, packets during a link outage are buffered in the MAGs, then bidirectional paths are established between the MAGs and packets are sent over the bidirectional path. The improved algorithm adds a cache queue to the LMA to cache the packets when the link is interrupted, and then waits until the link is clear before sending the cached packets to the MN. This not only reduces the signaling interaction between the MAGs, but also eliminates the need to establish a two-way path between MAGs and improves handover efficiency. The simulation results show that the new scheme has been greatly improved in reducing the packet loss and signaling interaction in the handover process.