网状WDM网中支持区分可靠性的共享通路保护算法
Shared-Path Protection Algorithm with Differentiated Reliability in Meshed WDM Networks
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摘要: 光纤链路由于共享了某些物理资源(如光缆、管道、通路等),因此存在一定的故障相关性,术语共享风险链路组(SRLG)就是用于描述链路之间的这种风险共享关系的.SRLG分离成为保护设计的重要约束.该文研究了支持区分可靠性的SRLG分离共享通路保护设计问题.结合SRLG条件故障概率的概念,提出了部分SRLG分离的共享保护算法PSD-SPP(Partial SRLG-Disjoint Shared-Path Protection),有效地解决了SRLG分离约束下的区分可靠性设计问题.仿真结果表明该算法既满足了用户的区分可靠要求,又能有效利用资源.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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