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Journal of Information Science and Engineering, Vol. 23 No. 2, pp. 649-660 (March 2007)

Pragmatic Segment Protection Employing Distributed Multiple-ring Search in WDM Mesh Networks*

I-Shyan Hwang, I-Feng Huang+ and Hung-Jing Shie
Department of Computer Engineering and Science
Yuan Ze University
Chungli, 320 Taiwan
+General Education Center
National Taiwan College of Performing Arts
Taipei, 114 Taiwan

This work proposes the segment fault protection mechanism called Non-Overlap Segment Protection (NOSP) and Overlap Segment Protection (OSP) using the method of multiple-ring search in Wavelength Division Multiplexing (WDM) mesh networks. Multiple- ring search operates in distributed control, and gathers network information through neighboring nodes. Hence, the proposed methods can be adopted in the arbitrary networking topology to obtain flexible protection segments and are very practical to work in the real-world environment. The segment protection has benefit of fasting the recovery time. This study also considers shared protection technique with constraints of Shared Risk Link Group (SRLG) and Shared Bandwidth Assignment (SBA); therefore, bandwidth utilization can be improved. Based on the dynamic traffic load, the performance of NOSP and OSP are investigated by the simulation. The results show that NOSP and OSP perform better outcome than other compared algorithms in the metrics of blocking probability and mean hop count.

Keywords: fault protection, NOSP, OSP, WDM, segment protection, shared protection, SRLG

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Received March 24, 2005; revised August 1 & November 9, 2005; accepted December 22, 2005.
Communicated by David H. C. Du.
* This paper was partially supported by the National Science Council of Taiwan, R.O.C., under grants No. NSC-92-2218-E-155-004 and NSC-93-2917-I-155-001, and presented at 2005 Symposium on Technology Fusion of Optoelectronics and Communications (STFOC'05)VInternational Conference on Photonics.