一种改进的移动节点快速切换算法研究与仿真

Research and Simulation of the Improved Mobile Node Fast Handover Algorithm

基于M PLS的移动IPv6网络中每次移动节点发生切换时都需要重建标签交换路径,影响了切换时延和造成了数据丢包.需要重用部分路径使切换时延、信令流量和数据丢包达到最少,提出了一种交叉路由器算法,通过对标签信息库的修改,增加了移动节点地址和时间计数器两个字段,移动节点每次发生切换注册时通过查找修改后的标签信息库中移动节点地址的方法来确认交叉路由器.理论分析显示随着跳数的增加,时延性能越明显,仿真结果证明移动节点在信息注册时信令流量减少了20%.该方案实现了部分路径重用,改善了网络服务质量.

In the MPLS-based Mobile IPv6 network, when mobile node performs handover, it needs to rebuild label switching path, which impacts the handover delay, signaling traffic and causes packets loss. Reused part of the path overcomes the above reasons, which proposes a cross-router（CR） algorithm. It modifies the label information base （LIB）, that is, increases two fields：the mobile node address and the time counter. When mobile node performs handover and registration,it will look up the modified LIB when the message arrive a router every times, whether the mobile node was registered or not to confirm the CR. The theoretical analysis shows that with the increase of the hops, the performance of delay is the more obvious. The simulation result proves that the signaling traffic have been decreased 20% ,when the mobile node performs register. This proposed scheme achieves reused part of the path and improved network quality of service （QoS）.