Shared-Path Protection Algorithm with Differentiated Reliability in Meshed WDM Networks
网状WDM网中支持区分可靠性的共享通路保护算法

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.