弹性光网络双重故障下的自适应保护级别算法

Adaptive Protection Level Algorithm for Dual Faults in Elastic Optical Networks

摘要:

为了降低弹性光网络中双链路故障保护下的业务及带宽阻塞率、均衡带宽资源分配,提出了一种双重故障下的自适应保护级别算法。该算法综合考虑传输距离、调制格式等因素,根据链路频谱资源使用状态动态地更新链路惩罚系数,选取最佳路径进行传输,同时根据请求类型及网络空闲资源状态自适应地选择保护方法,为业务提供最大限度的保护。仿真结果表明,在双链路故障下,算法在阻塞率方面取得了较好的性能,同时均衡了网络中各链路上的资源使用。

Abstract:

In order to reduce the traffic and bandwidth blocking rate under dual-link fault protection in the elastic optical network and balance the bandwidth resource allocation, an adaptive protection level algorithm under double faults is proposed. Considering such factors as transmission distance and modulation format, the algorithm dynamically updates the link penalty coefficient according to the use status of link spectrum resources, so as to choose the optimal path for transmission. At the same time, according to the request type and the state of idle network resources, self-adaptive protection methods are selected to provide maximum protection for services. Simulation results show that the algorithm achieves good performance in blocking rate and balances the use of resources on all links in the network under double link failure.