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

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(PartialSRLG-DisjointShared-PathProtection),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。

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.