弹性分组环保护倒换策略的研究

The Study of Protection Switch Schemes in Resilient Packet Ring

保护倒换是弹性分组环中的一项关键技术,目前IEEE802.17草案中的保护倒换策略只能够提供小于50ms 的保护倒换时间,但却无法在保护倒换发生后保证实时业务的服务质量。为解决此问题,针对RPR MAC层的两种结构模式——单队列和双队列模式,我们制定了两种不同的保护倒换策略并对它们进行了性能分析。仿真结果表明, 这些策略能在保护倒换发生后很好地确保实时业务的服务质量。

Protection switching is a key technique in Resilient Packet Ring(RPR). Although current protection switching scheme defined in IEEE802.17 draft can provide sub-fiOms protection switching time, it can not ensure QoS of real time service. To solve this problem, two new protection switching schemes are presented in this paper. These two schemes are respectively suitable for the two structures of RPR MAC: single-queue MAC and dual-queue MAC. The performances of these two schemes are also analyzed in this paper. Simulation results show that these schemes can ensure QoS of real-time service when protection switching occurs.