最小故障风险损失的弹性光网络多链路故障概率保护策略

刘焕淋; 易鹏飞; 张明佳; 陈勇

doi:10.11999/JEIT161159

最小故障风险损失的弹性光网络多链路故障概率保护策略

doi: 10.11999/JEIT161159

1.
(重庆邮电大学光纤通信技术与网络重点实验室重庆 400065) ②(重庆邮电大学自动化学院重庆 400065)

基金项目:

国家自然科学基金(61275077)，重庆市教委基金(KJ 1400421)，重庆市科委基础与前沿研究项目(2015jcyjA40024)

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出版历程
- 收稿日期: 2016-10-28
- 修回日期: 2017-03-17
- 刊出日期: 2017-08-19

Multi-link Failure Probability Protection Strategy Based on Minimum Fault Risk Loss in Elastic Optical Networks

1.
(Key Laboratory of Optical Communications and Networks, Chongqing University of Posts and Telecommunications, Chongqing 400065, China)
2.
(School of Automation, Chongqing University of Posts and Telecommunications, Chongqing 400065, China)

Funds:

The National Natural Science Foundation of China (61275077), The Scientific Research Fund of Chongqing Municipal Commission (KJ1400421), The Basic and Frontier Research Program of Chongqing (2015jcyjA40024)

摘要

摘要: 针对弹性光网络中多链路故障100%保护的资源消耗冗余度较高的问题，该文提出一种最小故障风险损失的概率保护(MFRL-PP)策略，在多链路故障时为业务提供高效率的概率保护。在MFRL-PP策略中，该文设计了一个综合考虑链路负载和故障风险的代价函数，为业务选择故障风险小且频谱资源消耗少的概率保护光路。当最小故障风险路径无法传输时，为进一步降低概率保护光路的故障风险损失，该文还设计了一种非对称业务流分流的最小故障风险损失概率保护机制，以便选择故障风险损失最小的分流路径组作为传输光路。同时，在传输光路的频谱分配阶段，提出了基于最大频谱重合度的可用频谱块选择策略，以减少频谱碎片的产生。仿真结果表明所提策略不仅有效地提升了频谱利用率，还较好地实现了带宽阻塞率与故障风险的平衡。
- 弹性光网络 /
- 多链路故障 /
- 最小故障风险损失 /
- 非对称业务流 /
- 带宽阻塞率
Abstract: Due to the high resource redundancy of full protection for requests multi-link failure in elastic optical networks, the strategy of Minimum Fault Risk Loss Probability Protection (MFRL-PP) is proposed to protect the request with high spectrum-efficiency. In the MFRL-PP, a link cost function integrated considering the link payload and fault risk is designed to choose the protection lightpath, which has minimum fault risk and consumes a small amount of spectrum resource. When the minimum fault risk lightpath is unavailable for shortage of idle spectrum resource, for further reducing the failure risk of the probability protection lightpath, a minimum fault risk loss probability protection mechanism for the non-symmetrical flow is designed to split the flow into two sub-flows for easily selecting the protection branch lightpath with the minimum fault risk loss. Moreover, in the phase of spectrum allocation for the lightpath, for reducing the number of spectrum fragmentations, a spectrum allocation strategy based on the maximum spectrum coincidence degree is put forward to allocate spectrum resource. The simulation results indicate that the proposed MFRL-PP algorithm can improve the spectrum utilization, and provide a better tradeoff between the bandwidth blocking probability and fault risk degree.
- Elastic optical networks /
- Multi-link failure /
- Minimum fault risk loss /
- Non symmetrical traffic flow /
- Bandwidth blocking probability

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参考文献(16)

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