面向业务的弹性光网络光路损伤感知能效路由策略

Energy Efficiency Routing Strategy with Lightpath Impairment Awareness in Service-Oriented Elastic Optical Networks

针对弹性光网络中物理损伤导致业务频谱利用率低和传输能耗高问题,该文提出一种面向业务的链路损伤感知频谱分区(LI-ASP)能效路由策略。在LI-ASP策略中,为降低不同信道间非线性损伤,基于负载均衡设计一个综合考虑链路频谱状态和传输损伤的路径权重公式,根据调制方式的频谱效率和最大传输距离构造分层辅助图,从最高调制等级开始,为高质量业务选择K条边分离的最大权重传输路径;为低质量业务选择K条边分离的最短能效路径。然后,LI-ASP策略根据业务速率比值对频谱分区,采用首次命中(FF)和尾端命中(LF)联合频谱分配方式,减少不同传输速率业务间的交叉相位调制。仿真结果表明,该文所提LI-ASP策略在有效降低带宽阻塞率的同时,减少了业务传输能耗。

To address the problems of low spectrum utilization and high energy consumption caused by physical impairment in elastic optical networks,a service differentiated energy efficiency routing strategy with Link Impairment-Aware Spectrum Partition (LI-ASP) is proposed.For reducing the nonlinear impairment between different channels,a path weight formula jointly considering the link spectrum state and transmission impairment is designed to balance the load.A modulation level-layered auxiliary graph is constructed according to traffic’s spectrum efficiency and maximum transmission distance.Starting from the highest modulation in the auxiliary graph,the K link-disjoined maximum weight paths are selected for high quality requests,and the K link-disjoined shortest energy efficiency paths are selected for low quality requests.Then,LI-ASP strategy divides spectrum partition according to requests rate ratio.The First-Fit (FF) and Last-Fit (LF) spectrum allocation policies are used to reduce cross-phase modulation between the requests with different rates.The simulation results show that the proposed LI-ASP strategy can reduce the bandwidth blocking probability and energy consumption effectively.