全光网中采用可信度模型的故障定位技术

宽带业务的飞速发展推动着光网络向着超大容量、超高速率方向演进．与此同时，在透明节点增加、光电再生设备减少的全光网络中，多故障定位的非完全多项式属性、网络拓扑的复杂性以及承载业务的多样性使得故障定位变得尤为困难．如何根据收集的告警信息，确切地找出故障的准确数目及其位置成为网络管理人员的难题．针对全光网中故障与告警的关系展开研究，在多故障定位的相关方向上完成了采用可信度推理方法对故障与告警之间的复杂映射关系进行梳理，建立了一种多故障条件下全光网故障定位模型，并以此为基础，提出了基于模糊隶属度以及联合可信度的两种启发式故障定位算法．通过不同的网络拓扑以及与其他的算法对比，对这两种算法以及可信度模型的正确性进行了验证．仿真结果表明，该模型能够很好地处理多故障定位问题的不确定性，且定位性能优越，具有很强的实际意义．

Mechanism for fault location based on the credibility model of all optical networks

Optical networks, driven by the rapid development of the broad band business, tend to be of large capacity and high rate. However, the complexity of optical networks topologies and the business deployment, together with the feature of NP-completeness make multi-link faults location difficult in a transparent optical network. How to diagnose the accurate faults number and location without doubt is becoming an intractable problem. We have studied the uncertain relationship between alarms and fault in all optical networks. A multi-link fault location model in an entire transparent optical network is established. Then we advance two heuristic fault location algorithms based on the credibility mode above, which could measure the credibility of multi-link faults location reasoning process according to alarms quantificational. Finally, we build up a simulation system to simulate the network model and fault propagation model in entire optical networks and obtain the fault location module to verify the correctness of multi-link faults location model based on credibility and the performance faults location of two algorithms. Simulation results show that the model solves the uncertainty of the fault location effectively, and two algorithms display the good performance on the accuracy of fault location.