【摘要】 提出了一种基于快速层次移动IPv6协议的QoS上下文转移框架,弥补了上下文转移协议中上下文仅在移动节点切换前的接入路由器和切换后的接入路由器间转移不能满足端到端的QoS机制需求的不足.采用端到端的QoS上下文转移方法,减少了移动节点切换后重新发起信令建立QoS转发处理所带来的延时,使移动节点会话的QoS服务中断最小.采用基于快速-层次移动IPv6框架,能提供无缝的切换并能减少移动节点切换期间的信令开销和切换延时.通过在网络模拟器ns2中的仿真实验比较了本方法与重新发起RSVP信令建立QoS状态的方法的性能,试验结果显示本方法具有更小的延时和更少的丢包.更多还原

【Abstract】 On the basis of the architecture for fast handover of hierarchical MIPv6,a framework for end-to-end QoS context transfer was presented,providing an end-to-end RSVP context transfer for real-time applications to overcome the weakness of the context transfer protocol which can not meet the need of end-to-end QoS mechanisms because the contexts were only transferred between the previous and new access routers.The framework decreased the delay caused by re-initiate QoS signaling from scratch to reestablish QoS forwarding process,and minimized the handover service disruption.The signaling overhead and handover latencies could be reduced by adopting the fast handover for hierarchical MIPv6 architecture.The approach was compared with the re-initiating RSVP signaling to re-establish QoS states using network simulator ns2.The numerical results showed that the scheme has the less latency and packet loss than that of the re-initiating approach.更多还原