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IEICE Transactions on Information and Systems 2006 E89-D(2):679-686; doi:10.1093/ietisy/e89-d.2.679
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Copyright © 2006 The Institute of Electronics, Information and Communication Engineers

Special Section on Parallel/Distributed Computing and Networking -- Papers -- Network Protocols, Topology and Fault Tolerance

Efficient Path-Segment Protection Utilizing Logical-Ring Approach in WDM Mesh Network

I-Shyan HWANG1, I-Feng HUANG2, Chih-Dar CHIEN1 and David H. SU3

1 The authors are with the Department of Computer Science and Engineering, Yuan-Ze University, Chung-Li, Taiwan, R.O.C., 2 The author is with the Department of Information Management, Kang-Ning Junior College, Taipei, Taiwan, R.O.C. E-mail: ifeng{at}knjc.edu.tw, 3 The author is with National Institute of Standards and Technology, Gaithersburg, MD 20899, U.S.A.

This work proposes a distributed fault protection mechanism called the Dynamic-Shared Segment Protection (DSSP) algorithm for WDM (Wavelength Division Multiplexing) mesh networks. The objects are to assure high probability of path protection and efficient use of network resources. The proposed approach exploits the segment protection mode, which accommodates the characteristics of both path-based and link-based protections, for providing finer service granularities, to satisfy the versatile requirements of critical applications in the foreseeable future. To show that DSSP can improve performance efficiency, simulations are conducted using four networks (NSFNET, USANET, Mesh 6 x 6, Mesh 9 x 9) for a comparative study of the proposed DSSP versus ordinary shared protection schemes and SLSP (Short Leap Shared Protection). Simulation results reveal that the proposed DSSP method results in much lower blocking probability and has higher network utilization. Consequently, it is very useful for applications to a real-time WDM network, which changes status dynamically.

Key Words: fault protection, DSSP, WDM, mesh topology, segment protection, shared protection, SRLG

Manuscript received March 21, 2005. Manuscript revised August 16, 2005.


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