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| Shared-Path Protection Algorithm with Differentiated Reliability in Meshed WDM Networks |
| Yu GongFang;Wen HaiBo;Wang Sheng;Li LeMin |
| Key Lab of Broadband Optical Fiber Transm. and Comm. Networks,UESTC, Chengdu 610054, China |
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Abstract Fiber links, because of sharing some common physical resources （such as fiber cable, conduit, right of way, etc.）, have certain failure-dependent. The term “Shared Risk Link Groups （SRLG）” is introduced to describe the relationship between links with shared risk; SRLG diversity has become the important constraint of protection design problem. This paper addresses SRLG-constraint-based shared-path protection design problem with differentiated reliability. Via SRLG conditional failure probability concept, an efficient PSD-SPP （Partial SRLG-Disjoint Shared-Path Protection） algorithm is proposed to solve the protection design problem with differentiated reliability when considering links failure-dependence. Simulation result shows this algorithm not only efficiently satisfies the user-specific requirement, but also effectively decreases the network-blocking ratio.
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Received: 03 March 2004
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2005, Vol. 27 
