基于上下文传输的安全快速垂直切换优化

Optimization of Secure and Fast Vertical Handoff Based on Context Transfer

异构无线网络中频繁发生垂直切换,由于不同网络分属不同网络管理域,致使切换认证严重制约切换效率。基于安全上下文传输,设计了一种安全快速垂直切换优化机制。借助动态建立的安全上下文传输通道,把移动节点的认证信息安全传递给目标切换网络。从而避免了家乡网络的参与,通过分布式切换认证来优化切换效率。通过NS-2搭建网络仿真环境对优化机制进行了性能仿真,结果表明该优化机制可以在保证安全切换的前提下显著提高切换效率。

Vertical handoff takes place frequently among heterogeneous wireless networks and thus handoff efficiency is limited severely by handoff authentication, since different networks belong to different operators. An optimized scheme of secure and fast vertical handoff is proposed based on se-cure context transfer. Authentication information of mobile node can be transmitted to target network through the secure transmission channel created dynamically. Therefore, home network is avoided to execute the handoff authentication and handoff efficiency is improved by distributed authentication. Simulation results given by the NS-2 indicate that the optimized scheme can improve handoff effi-ciency observably under the premise of secure handoff.