RSVP协议在移动IPv6网络中的扩展性研究

Research of Extensions to RSVP for Mobile IPv6 Networks

针对无线移动通信的特点,提出了一种在移动IPv6网络中保障用户通信服务质量的资源预留新方案Fast RSVP.该方案采用跨层设计的思想,将两个不同层次的模块:移动IPv6模块和RSVP模块结合起来,通过在两个模块之间增加一些原语使得二者配合工作以保证移动用户的通信业务质量.Fast RSVP方案引入了邻居隧道提前资源预留、优化路径资源预留、切换预留、路径融合等一系列新机制.仿真实验结果表明,与其他移动环境中的RSVP扩展方案相比,该Fast RSVP方案在支持无线移动通信方面具有如下优势:(1)能够实现移动节点带有服务质量保证的快速切换;(2)能够避免移动IP切换过程中三角路由和重复预留造成的资源浪费;(3)能够区分不同类型的切换预留请求,在保证网络整体性能的前提下显著降低因为切换而导致的服务中断率.

Aiming at the features of wireless mobile communication, this paper proposes a new resource reservation scheme, Fast RSVP （resource reservation protocol）, to guarantee the QoS of sessions for mobile IPv6. The scheme adopts cross-layer design, it cooperates two modules at different layers： Mobile IP module and RSVP module. By adding some primitives, the scheme lets the two modules work together to guarantee the QoS of sessions for mobile users. Fast RSVP imports a series of new mechanisms such as advanced resource reservation on neighbor tunnels, resource reservation on optimized routes, resource reservation for handover sessions, path merging etc. Simulation results show that Fast RSVP scheme, compared with other traditional RSVP extensions for mobile environments, has the following advantages： （1） it realizes a mobile node handover with QoS guarantees; （2） it avoids resource wasting caused by triangular routes and duplicate reservations in mobile IP handover process; （3） it distinguishes different types of reservation requests, greatly reducing the handover session forced termination rate while maintaining high performance of the network.