恢复时间敏感的光网络混合通路保护算法

针对波分复用(wavelength division multiplexing,WDM)光网络中双链路失效的抗毁需求,研究并提出一种恢复时间敏感的混合通路保护算法.该算法通过引入业务连接的恢复时间约束,利用专用保护业务切换时间快而共享保护资源利用率高的特点,采用专用通路保护(dedicated path protection,DPP)与共享通路保护(shared path protection,SPP)相结合的方式,解决业务切换时间与网络资源利用率之间的矛盾,根据服务等级协定(service level agreement,SLA),在网络资源较少的情况下,优先保证高等级业务的保护资源分配,从而为不同等级业务提供灵活的区分业务恢复度的资源配置方案.仿真结果表明,与传统的DPP和SPP相比,恢复时间敏感的混合通路保护算法在满足业务恢复时间门限的前提下,能够在平均恢复时间、网络资源利用率以及业务连接恢复度性能上获得较好地折中.

Recovery-time aware hybrid path protection algorithm in optical networks

For the requirement of surviving against double-link failures in WDM (wavelength division multiplexing) optical networks, we study and propose a recovery-time aware hybrid path protection algorithm. By introducing a constraint of service connection recovery time, as well as exploiting its characteristics of short service switching time of dedicated protection and high resource utilization ratio of shared protection, the proposed algorithm cooperates the dedicated path protection (DPP) and the shared path protection (SPP) to solve the conflict between the service switching time and the network resource utilization ratio, then, in accordance with the service level agreement (SLA), preferentially assigns protection resource for high-level services under a lack of network resource, so as to provide flexible recovery-degree-differentiated resource deployments for multilevel services. The simulation results indicate that, compared with the traditional DPP and SPP, the recovery-time aware hybrid path protection can meet the requirement of service recovery-time threshold, while achieving a good trade-off among average recovery-time, network resource utilization ratio, and service connection recovery degree.