PMIPv6中应用分布式组播锚点的低时延组播数据切换方案

A Low Delay Multicast Data Handover Scheme Using Distributed Multicast Anchor in PMIPv6

为解决代理移动IPv6(Proxy MIPv6,PMIPv6)实现组播侦听者发现功能时存在的切换时延问题,提出了一种利用分布式组播锚点(Distributed Multicast Anchor,DMA)的组播数据切换方案.给出了相关的移动性管理策略及实现所提方案的信令扩展方法,推导了所提方案的时延,并依此进行性能分析.数值分析结果表明,在链状隧道长度较大或快速切换不可行或组播会话到达较频繁时,所提方案在切换时延方面优于现有方案.

To resolve the large handover delay problem of implementing the Multicast Listener Discovery （MLD） function in Proxy Mobile IPv6 （PMIPv6）, a handover protocol using Distributed Multicast Anchor （DMA） for muiticast data is proposed in this paper. Mobility management strategies and how to extend the signaling to support the scheme in reality are given. Moreover, the handover delay in the proposed scheme is derived, basing on which the performance of the proposed scheme is analyzed. Numerical results indicate that the scheme outperforms the existing scheme in terms of delay when the length of the chain tunnel is relatively large or fast handover is not feasible or the session of multicast arriving frequently.